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1
RATOV, B. T., B. V. FEDOROV, A. M. ISONKIN, S. T. ZAKENOV, and B. R. BORASH. "MODERN DESIGNS OF DIAMOND DRILLING TOOLS FOR WELL DRILLING." Neft i Gaz, no. 2 (April 15, 2022): 92–102. http://dx.doi.org/10.37878/2708-0080/2022-2.08.
Повний текст джерелаАнотація:
The article presents the results of research on the creation of drill bits with high durability and sufficient productivity when drilling hard rocks. Four areas of research have been identified to solve this problem: the crown must be multilayer, the profile of the diamond-bearing layers must represent annular conical protrusions and cavities; diamond layers should be separated by diamond-free layers of lower hardness and experience uniform specific pressure during operation; the design of the bit should take into account the peculiarities of the rock destruction mechanism under the action of diamond grains; the manufacturing technology of the crown matrix must be perfect. Only defect-free diamonds obtained by sorting with special methods are involved in the creation of the matrix; Adding CrB2 or VN nanopowders to the composition of the charge makes it possible to improve the quality of the matrix structure, all tribiological and operational properties, and due to the preliminary metallization of high-strength synthetic diamonds, a transition zone “diamond-coating-matrix material” is created, which will significantly increase the wear resistance of diamond rock cutting tools. The mentioned problems have been partially solved: a multilayer impregnated bit with a ridged profile of diamond-bearing layers and a uniform specific pressure on the latter during drilling has been created and put into production, laboratory studies have been carried out to improve the quality of composite materials with positive results, further research is being carried out in all other areas.
2
Gao, Chao, Jun Tang Yuan, Hao Jin, and Zhong Quan Song. "Wear Characteristics of Impregnated Diamond Bit in Drilling Armor Ceramic." Advanced Materials Research 179-180 (January 2011): 1150–55. http://dx.doi.org/10.4028/www.scientific.net/amr.179-180.1150.
Повний текст джерелаАнотація:
This paper describes the wear characteristics of impregnated diamond bits when drilling in Al2O3 armor ceramic. With different bits being developed, drilling experiments and scanning electron microscope (SEM) examinations were conducted, and the results show that diamond wear types consist of complete crystal shape, micro fragmentation, whole fragmentation, wearing flat and falling off of diamond; abrasive wear, impact abrasion and erosion exist in the wear of diamond and bond; diamond grain size and concentration have their optimal value under fixed machining conditions; diamonds of high quality could increase bit drilling efficiency and serving life; the bit whose abrasion rate of bond matches that of diamonds presents the best comprehensive properties.
3
Tsysar, Maksym, Sergey Ivakhnenko, Anatoliy Zakora, Galina Ilnitska, Oleg Zanevsky, and Eugenia Zakora. "Dependence of static strength of large single crystals of synthetic diamond type and Ib octahedral habit after heat treatment on their size." Mechanics and Advanced Technologies 5, no. 2 (November 9, 2021): 177–82. http://dx.doi.org/10.20535/2521-1943.2021.5.2.233077.
Повний текст джерелаАнотація:
This article focuses on the problem of using large single crystals of type Ib synthetic diamond in single crystal and drilling tools. According to the literature review for the use of large diamonds in drilling equipment relevant conditions. The is shown possible negative effects of the temperature load on the diamond single crystal. The is presented developed technique for estimating the static strength of large diamond single crystals. It has been shown that microcrystals in the form of octahedra and cubes are formed as a result of heat treatment on the surface of synthetic diamond single crystals. The results of studies of the strength of large single crystals of synthetic diamonds of millimeter size are shown. In contrast to the classical approach, when IIb crystals are used for the production of drilling equipment, we present Ib crystals because they are closer to natural diamond in terms of physical and mechanical properties. The static strength criterion was used to assess the strength. It has been shown that crystals with a size of 1000 ... 1100 μm have a higher value of static strength than crystals with a size of 1200 μm and larger.
4
Tsysar, Maksym, Anatolii Zakora, Anton Babak, Serhiy Ivakhnenko, Oleg Zanevskii, Halyna Ilnitska, and Ievgeniia Zakora. "DEPENDENCE FOR SYNTHETIC DIAMOND LARGE CRYSTALS TYPE Ib OF OCTAHEDRAL HABITUS ON THEIR SIZE AFTER CHEMICAL-THERMAL PROCESSING OF STATIC STRENGTH." Technical Sciences and Technologies, no. 4(26) (2021): 43–49. http://dx.doi.org/10.25140/2411-5363-2021-4(26)-43-49.
Повний текст джерелаАнотація:
The use of large single crystals of diamond, grown by HP-HT with the latest technologies in drilling tools, can improve the productivity of the drilling process, increase the penetration rate, reduce wear of the main matrix, and provide a safe working environment when drilling solid rocks.For an informed choice or design of the working part of the drilling equipment, an analysis of the functional purpose is important.The main role here is played by the factor of complexity of geodetic conditions: the angle of drilling, fracture toughness and class of rocks, their changes with the depth of drilling.Analysis of studies and publications on functional analysis showed that diamonds should not only have high hardness and static strength, they should have a high value of thermal strength and chemical resistance, which will allow them to be used with sufficient efficiency when developing wells in difficult geological conditions. However, the main indicator of the suitability of such single crystals is still strength. It has been experimentally proven that the main type of diamond wear during drilling is partial or complete chipping of the protruding part of the crystals. Thus,the bits are equipped with harder diamonds, they will allow to process harder rocks without chips, reduce wear of the matrix itself, provide higher drilling speeds alongwith a decrease in energy consumption and consumption of consumables, for example, drilling mud.The purpose of the article is to analyze the effect of chemical-thermal exposure, as an integral part of the technological process of manufacturing drill bits, on the tensile strength of synthetic diamonds of octahedral habit type Ib obtained by HP-HT technology.Based on the data obtained experimentally, the work shows the suitability of synthetic diamonds as part of a functional cutting tool for drilling and geological exploration. The optimal size of crystals was determined, at which a sufficient level of strength is provided. The falling dependence of the strength on the edge length of the investigated diamond single crystals is graphically demonstrated.For the first time, the paper presents a study of the effect of chemical-thermal treatment as part of the technological process of manufacturing a drilling tool on the strength of non-magnetic single crystals of synthetic diamond type Ib. The presented materials can be used for a reasonable choice or design of drill bits impregnated with largesingle crystals for drilling and geological exploration.
5
Han, Xiaoming, Qiangqiang Zhang, Shifeng Wang, Jialiang Li, and Detuo Chen. "Influence of polycrystalline diamond compact bit geometric parameters on drilling performance during gas drainage borehole in soft coal seam." Advances in Mechanical Engineering 10, no. 1 (January 2018): 168781401775066. http://dx.doi.org/10.1177/1687814017750667.
Повний текст джерелаАнотація:
Polycrystalline diamond compact bit is the main rock-breaking tool of gas drainage borehole. In order to investigate the influence of geometric parameters of polycrystalline diamond bit on its drilling performance, the integrated force model of polycrystalline diamond bit pressed into rock was established. The stress analysis results show that the tooth rake angle, pressing depth, and horizontal tangential displacement are the main factors to influence the normal load and the axial load of polycrystalline diamond bit. There is an optimal tooth rake angle value of polycrystalline diamond bit cutter when it is used in the soft coal seam. The drilling experiment system was built to verify the drilling performance of drill bits with different geometric structure and different tooth rake angle through drilling the soft coal wall. The experiment results show that the drilling torque and feeding resistance of polycrystalline diamond bit are higher than that of the wing bit at the beginning of drilling the soft coal wall. With the increase in the drilling depth, the feeding resistance of wing bit will increase to exceed that of the polycrystalline diamond bit. So the polycrystalline diamond bits should be selected to drill the gas drainage borehole in soft coal seam. The polycrystalline diamond bit with bigger tooth rake angle cannot cut and break the coal rock effectively, which will reduce the drilling efficiency and the feeding speed. When the tooth rake angle is smaller, polycrystalline diamond bit cannot cut in coal wall effectively, which will increase the feeding resistance. So the polycrystalline diamond bit with tooth rake angle of 15°–20° is suitable for the gas drainage borehole in soft coal seam. With the increase in the rotary speed of polycrystalline diamond bit, the cutting thickness of coal rock decreases and the horizontal tangential displacement increases. When the rotary speed of polycrystalline diamond bit is 290 r/min, the mean drilling torque and mean feeding resistance of polycrystalline diamond bit reach the minimum. Therefore, in order to reach the optimum drilling performance, the working parameters of low drilling pressure and high rotary speed are usually selected during the actual gas drainage borehole in soft coal seam.
6
Wang, Chuanliu. "Bionic design and test of polycrystalline diamond compact bit for hard rock drilling in coal mine." Advances in Mechanical Engineering 12, no. 5 (May 2020): 168781402092318. http://dx.doi.org/10.1177/1687814020923180.
Повний текст джерелаАнотація:
For hard rock drilling in coal mine, the drilling efficiency and service life of polycrystalline diamond compact bit are very low. To overcome these shortcomings, the bionic technology is applied to the design and processing of polycrystalline diamond compact bit. The bit body and polycrystalline diamond compact cutter are designed as bionic structures, and the test of the bionic polycrystalline diamond compact bit is carried out. Test results show that, when drilling in fine sandstone with hardness greater than 9, the performance of the bionic polycrystalline diamond compact bit is significantly improved. Comparing with the Φ113-mm concave polycrystalline diamond compact bit, the service life and drilling efficiency of the A-type bionic polycrystalline diamond compact bit increase by 54% and 230%, respectively, the service life and drilling efficiency of the B-type bionic polycrystalline diamond compact bit increase by 345% and 204%, respectively, which show that the bionic design of polycrystalline diamond compact bit can provide a new research idea for hard rock drilling in coal mine. Also the test results indicate that, when processing the bionic polycrystalline diamond compact cutter, the linear cutting process will cause thermal damage to the diamond layer of polycrystalline diamond compact cutter, while the cold grinding process shows higher comprehensive performance, therefore the one-time synthesis of bionic polycrystalline diamond compact cutter is the future research direction.
7
Xiao, Bing, Hong Jun Xu, Hong Hua Su, Yu Can Fu, and Jiu Hua Xu. "Machining Performance on Multi-Layer Brazed Diamond Tools." Key Engineering Materials 416 (September 2009): 598–602. http://dx.doi.org/10.4028/www.scientific.net/kem.416.598.
Повний текст джерелаАнотація:
An attempt has been made to investigate the new generational manufacturing technology for multi-layer diamond tools by brazing. A kind of new multi-layer brazed diamond core drills with random grains distribution was made by mixing diamond particles with brazing alloy powders. And a preliminary machining performance experiment was carried out through drilling granite. The testing results show the typical topography of the multi-layer brazed diamond core drills after drilling granite, just like that of multi-layer sintered ones, is that diamond grits drag long tails. Different from multi-layer sintered diamond core drills, no grit pull-outs can be seen during the whole drilling process because of chemical metallurgical effect between diamond grit and brazing alloy, the same as monolayer brazed diamond core drills. The main drawback to this kind of multi-layer brazed diamond tools is each individual particle is not subjected to the same drilling force throughout the drilling operation because of random grain distribution. This leads to premature fracture of the leading particles. Similarly, because large gaps between particles exist, the bond is being exposed to the workpiece, which leads to erosion of the bond. The overall performance is lower tool lives and slower drilling speeds. Therefore, ideally, diamond particles should be evenly distributed throughout the bond, which means they are all subject to the same drilling forces and the multi-layer brazed diamond tool is operated at its optimum efficiency.
8
Yang, Jun De, Zhong Ping Luo, Fan Lu, and Yuan Wang. "Research on Embedding Strength of Diamond." Key Engineering Materials 480-481 (June 2011): 560–67. http://dx.doi.org/10.4028/www.scientific.net/kem.480-481.560.
Повний текст джерелаАнотація:
It is stated that Diamond saw blades requires high embedding strength of the diamond, while diamond drill bits do not. It is necessary to improve the embedding strength of diamond in diamond saw blades, rather than in the diamond drilling bits. It is recommended to count the number of diamond particles on the matrix surface and get the embedding strength of diamond by calculation. Another recommendation is to use the compound powder of cobalt and tungsten carbide for pelletizing in order to improve the embedding strength of diamond and lower the cost of matrix. There are people studying how to raise embedding strength of diamond, for both diamond saw blades and diamond drilling bit. However, the requirements for embedding strength of diamond saw blades and diamond drilling bit are different. The following parts include the analysis for this problem.
9
Tang, Qiongqiong, Wei Guo, Ke Gao, Rongfeng Gao, Yan Zhao, Yang Sun, and Yu Zhou. "Design and test of a self-adaptive bionic polycrystalline diamond compact bit inspired by cat claw." Advances in Mechanical Engineering 10, no. 11 (November 2018): 168781401881024. http://dx.doi.org/10.1177/1687814018810249.
Повний текст джерелаАнотація:
Cats protract claws while hunting or pawing on the ground and retract to muscles when relaxing. Inspired by this behavior, and in order to solve the problem of short service life and low comprehensive drilling efficiency of polycrystalline diamond compact bits which results from its poor adaptability to soft-hard interbedded strata, a self-adaptive bionic polycrystalline diamond compact bit was designed, which can use the elastic element to adjust its back-rake angle according to the formation hardness to improve the adaptability of polycrystalline diamond compact bits. Theoretical analysis and drilling test results show that the self-adaptive bionic polycrystalline diamond compact bit has a strong adaptability to soft-hard interbedded rock strata. When drilling in soft rock, the back-rake angle is small and the rate of penetration is high; when drilling in hard rock, the angle becomes larger to reduce the abnormal damage of cutters. Thus, it can improve the integrated drilling efficiency and service life of polycrystalline diamond compact bits. In the whole drilling test, the average penetration rate of the self-adaptive bionic polycrystalline diamond compact bit increases by 10%–13% over conventional polycrystalline diamond compact bits with the same dimension and material.
10
Chen, Shun Tong, Zong Han Jiang, Yi Ying Wu, and Hong Ye Yang. "Development of a Reverse Micro EDM-Drilling for Holing Diamond-Tool." Advanced Materials Research 126-128 (August 2010): 802–7. http://dx.doi.org/10.4028/www.scientific.net/amr.126-128.802.
Повний текст джерелаАнотація:
This study presents the development of a drilling technique for an innovative tabletop drilling machine that combines micro-EDM with drilling to fabricate micro-holes in diamond-tool. The mechanisms designs of double V-shaped bearings and double spindles which provide a precision clamping and vertical alignment for diamond-tool and micro-tube are devised to enable to machine a co-centric micro-hole for micro-tool. A diamond-tool, made with copper-based sintered alloy, is drilled by using the developed technique of co-centric micro-hole EDM-drilling into a hollow shaft which can create equilibrium of drilling forces, prevent a drilling squeezing to be occurred and enable to offer a temporary storing space for drilling chips. Relative experiments including the determinations of drilling ratio and discharge capacitance are carried out via this established machine. Experimental results show that excellent geometric and dimensional accuracy of micro-holes on the diamond-tool can be achieved.
11
Mei, Xiao Qin, Guo Fu Yin, and Yang Luo. "Research on FDM Technique for the First Die of Matrix PDC Bit." Key Engineering Materials 522 (August 2012): 192–96. http://dx.doi.org/10.4028/www.scientific.net/kem.522.192.
Повний текст джерелаАнотація:
Polycrystalline Diamond Compact Bit is a new type of drilling tools, which has been developed with the developing of Polycrystalline Diamond Compact Technology. Because of excellent abilities of anti-erosion and shock resistance, PDC bit has higher security and efficiency than rock bit in drilling field [. It has been used more and more in oil drilling and coal drilling, especially, in offshore drilling, ultra-deep drilling and slim-hole drilling [.
12
Hou, Yali, Changhe Li, Hongliang Ma, Yanbin Zhang, Min Yang, and Xiaowei Zhang. "An Experimental Research on Bone Drilling Temperature in Orthopaedic Surgery." Open Materials Science Journal 9, no. 1 (October 6, 2015): 178–88. http://dx.doi.org/10.2174/1874088x01509010178.
Повний текст джерелаАнотація:
The bone drilling temperature fields under different cutting parameters and cooling modes were experimental researched by using common twist drill, diamond punching pin, diamond bullet-like grinding head and diamond spherical grinding head. Three cooling modes were applied, namely, natural air cooling, normal saline pouring cooling and normal saline spray cooling. K-thermocouple was used to measure temperature in bone hole. Results showed that the drill shape could influence drilling temperature greatly. The maximum drilling temperature of diamond spherical grinding head is 46.31°C. The maximum drilling temperature of common twist drill is 42.1°C and that of diamond bullet-like grinding head is 38.29°C. The drilling temperatures at drill speed is under 560 r/min, 900 r/min, 1,250 r/min and 2,100 r/min are 38.84°C, 41.1°C, 43.84°C and 46.31°C. This reflects that under same of other drilling parameters, drilling temperature increases with the increase of drill speed. The maximum bone drilling temperatures of diamond punch pin under 2,100 r/min speed of mainshaft and air cooling conditions vary as feed speed increase firstly and then decrease. The normal saline spray cooling has the lowest maximum drilling temperature of (29.34°C) at same depth, following by normal saline pouring cooling of (32.45°C) and air cooling of (40.28°C) successively. The normal saline spray cooling has the best cooling effect, followed by normal saline pouring cooling and air cooling successively.
13
Miller, Duncan, and Anthony Ball. "The wear of diamonds in impregnated diamond bit drilling." Wear 141, no. 2 (January 1991): 311–20. http://dx.doi.org/10.1016/0043-1648(91)90276-z.
Повний текст джерела
14
Xie, Dou, Zhiqiang Huang, Yuqi Yan, Yachao Ma, and Yuan Yuan. "Application of an innovative ridge-ladder-shaped polycrystalline diamond compact cutter to reduce vibration and improve drilling speed." Science Progress 103, no. 3 (June 26, 2020): 003685042093097. http://dx.doi.org/10.1177/0036850420930971.
Повний текст джерелаАнотація:
Polycrystalline diamond compact bits have been widely used in the Oil and Gas drilling industry, despite the fact that they may introduce undesired vibration into the drilling process, for example, stick-slip and bit bounce, which accelerate the failure rate and lead to higher drilling costs. First, we develop an innovative ridge-ladder-shaped polycrystalline diamond compact cutter, which has ridge-shaped cutting faces and multiple cutting edges with stepped distribution, in the hope of reducing vibration and improving drilling speed. Then, the scrape tests of ridge-ladder-shaped and general polycrystalline diamond compact cutters are carried out in a laboratory, indicating that the cutting, lateral, and longitudinal forces on ridge-ladder-shaped polycrystalline diamond compact cutters are smaller and with minor fluctuations. Due to different rock-breaking mechanisms, ridge-ladder-shaped polycrystalline diamond compact cutters have higher cutting efficiency compared to general polycrystalline diamond compact cutters, which is also verified experimentally. Finally, the drilling characteristics of a new polycrystalline diamond compact bit fitted with some ridge-ladder-shaped polycrystalline diamond compact cutters are compared to those of a general polycrystalline diamond compact bit by means of finite element simulation. The results show that introducing ridge-ladder-shaped polycrystalline diamond compact cutters can not only reduce the stick-slip vibration, bit bounce, and backward rotation of drill bits effectively, but also improve their rate of penetration.
15
Mu, Juan, Jiu Hua Xu, Yan Chen, and Yu Can Fu. "Experimental Research on Temperature of Drilling CFRP with Brazed Diamond Core Drill." Materials Science Forum 800-801 (July 2014): 776–81. http://dx.doi.org/10.4028/www.scientific.net/msf.800-801.776.
Повний текст джерелаАнотація:
During the drilling process of CFRP laminate with brazed diamond core drill, drilling temperature is very important to the drilling CFRP with brazed diamond core drill, which will influence the tolerance, defects of CFRP. In drilling experiments of CFRP laminate, the temperatures under different cutting parameters were measured by an infrared camera, and the effects of drilling parameters on drilling temperature were analyzed and the influence of grits distribution on temperatures were also studied. The results shown the drilling temperatures rise while increasing density of grits, grinding speed, and decreasing feeding speed.
16
Yang, Xiao Fan, You Sheng Li, Zhi Long Xu, Ju Dong Liu, and Bi Jin Wu. "Research on Performance of Drilling Carbon Fiber Reinforced Plastics with Diamond Coated Special Drill." Advanced Materials Research 1088 (February 2015): 733–38. http://dx.doi.org/10.4028/www.scientific.net/amr.1088.733.
Повний текст джерелаАнотація:
The carbide cemented special drills with TiAlCrN/TiSiN coating and diamond coating respectively were selected to drilling on carbon fiber reinforced plastics (CFRP) for a contrast test in this paper. The drilling force , drilling exit surface quality and tool wear were analyzed separately to research the performance characteristics of the two kinds of special drills with different coating. The results show that: under the same cutting conditions, the thrust force of the special drill with diamond coating is smaller than that of the TiAlCrN/TiSiN coating, and the tool life is extended by 2 times at the same time. The diamond coated special drill can improve the drilling surface quality, it is more suitable for drilling CFRP.
17
Azad Bagirov, Azad Bagirov, and Shohlat Aliyev Shohlat Aliyev. "DRILLING MECHANISM BASED ON THE APPLICATION OF DIAMOND DRILLING BITS." PAHTEI-Procedings of Azerbaijan High Technical Educational Institutions 16, no. 05 (April 25, 2022): 143–50. http://dx.doi.org/10.36962/pahtei16052022-143.
Повний текст джерелаАнотація:
In order to express how much the drill selection depends on the rock properties and its effect on the percentage of core and drilling speed, diamond drill selection and drilling mechanisms are taken. In diamond drills, enough pressure should be applied to ensure that each active diamond grain sinks into the rock for the best drilling speed. This stress should be above the surface strength of the rock to be drilled and below the diamond grain strength. The main goal to be achieved in engineering and research and development studies is to ensure that both the designed system and the product to be developed have maximum performance. In order to reveal the conditions in which the best results will be obtained, first the feature that determines the performance is determined and the factors affecting this feature are examined. Then, experiments are carried out to determine the effects of these factors on the feature that determines the performance and to find the most suitable combination (by taking into account the uncontrollable factors). Optimum conditions are determined by evaluating the performance indicator obtained as a result of the experiments. The experiments carried out within the framework of this approach can be perceived as the question asked to the system, and the results of the experiments as the answer given by the system. The critical point is that it is necessary to ask the right question in order to get the right answer. Drilling is a complex event influenced by many factors. Drill type and diameter, rotational speed, pressing force, torque and circulating fluid are controllable parameters. On the other hand, physic mechanical properties of the rock and geological conditions (uncontrollable factors such as discontinuities, bedding conditions, grain size, matrix structure, porosity, cementation degree and abrasive mineral ratio) affect rock drill ability. The drill ability of rocks can be defined by various concepts such as feed rate, drill wear amount, drill life and tooth penetration. Drilling method classification can be made according to several criteria. The most logical classification can be made according to the type of energy required for rock fragmentation. Drilling is done in rocks for many purposes and many methods developed for this purpose have successfully drilled into rocks. Many new methods in rock drilling have been acquired through experience. The most successful practical application is the mechanical shredding process. Although it is mostly applied for cutting soft rocks, this method is done by spraying high pressure water. Keywords: drilling, drilling process, drilling operations, tools, drilling mechanism, drilling diamond.
18
Zhao, Zi Han, Liang Wen, Jin Bang Song, De Dong Yu, Ming Chen, and Steve G. F. Shen. "Effect of Diamond Coating on Drilling Force and Temperature during High Speed Micro Drilling of Bone." Advanced Materials Research 1136 (January 2016): 239–44. http://dx.doi.org/10.4028/www.scientific.net/amr.1136.239.
Повний текст джерелаАнотація:
Bone drilling commonly exists in clinical practice and the heat and force generated by the drilling process has a huge impact on the surgery effect and the recovery of patients. High speed drilling, proved to have less injury and be more efficient when compared to the traditional low speed drilling, is considered to be the development direction of bone drilling-related surgeries. In order to make a further study of the controlling of the heat and force during the bone drilling process, the experiment designed to examine the influence of the diamond coating has been conducted and the result indicates that the diamond coating generally has little influence on the drilling force, however, it can increase the drilling temperature to a certain extent which indicates that the diamond coating is not suitable to apply to bone drills under the conditions of the conducted experiments. The result of this research could be of some help to the development of new kinds of medical drills.
19
Xu, Liang, Yibo Liu, and Yanlong Sun. "Development of Dry Drilling Diamond Bit and Drilling System." Journal of Physics: Conference Series 2141, no. 1 (December 1, 2021): 012005. http://dx.doi.org/10.1088/1742-6596/2141/1/012005.
Повний текст джерелаАнотація:
Abstract This paper summarizes the current situation, market demand and existing problems of dry drilling for stone and building materials construction at home and abroad. The use and characteristics of dry drilling, the structural design of dry drilling diamond bit and the selection of matrix formula are introduced. Finally, through the test of drilling reinforced concrete with long dry drilling bits, the related equipment of the complete dry drilling system is introduced in detail.
20
Zhadanovsky, Boris. "Mechanical processing of concrete and reinforced concrete with diamond tool." MATEC Web of Conferences 193 (2018): 03013. http://dx.doi.org/10.1051/matecconf/201819303013.
Повний текст джерелаАнотація:
The technology and organization of construction production using high-performance machines equipped with a diamond tool for machining concrete, concrete and stone surfaces is considered. Various installations, machines and mechanisms with a diamond tool for milling, grinding, drilling and cutting surfaces are presented. The design decisions of the grinding machine MSh-300, installations for machining the surfaces of facing slabs, a high-performance drilling machine and a concrete surface milling cutter are considered. An analysis of domestic and foreign installations has been carried out, which showed that the specific consumption of diamonds in domestic installations is lower with higher productivity. Having studied the sales statistics of manufacturers of individual machines and plants, as well as the positive feedback from implementing construction organizations, it is recommended to use, for the further prospect, high-performance machines and installations with a diamond tool in connection with an increase in the volume of reconstruction of industrial and civil facilities and the construction of transport highways.
21
Su, Hong Hua, Hong Jun Xu, Bing Xiao, Yu Can Fu, and Jiu Hua Xu. "Study on Machining of Hard-Brittle Materials with Thin-Walled Monolayer Brazed Diamond Core Drill." Materials Science Forum 471-472 (December 2004): 287–91. http://dx.doi.org/10.4028/www.scientific.net/msf.471-472.287.
Повний текст джерелаАнотація:
A new method for fabricating the thin-walled diamond core drill by brazing technology and the optimum grain distribution was proposed in this paper. Machining performance experiments have been carried out, including contrast tests about drill life and machining efficiency for the thin- walled monolayer brazed diamond core drill and electroplated one. The testing results show that thin-walled monolayer brazed diamond core drill has certainly super-excellent machining performance. Wear mechanism of diamond grits was studied in tho se drilling processes. No pulling out for the thin-walled monolayer brazed diamond core drill grits is the key factor of its longer life, and the optimum grain distribution and less wear flat of grits during drilling decrease the drilling spindle direction force, and improve the machining efficiency. It can be concluded that the new technology can radically improve the bonding strength at the grains interface, and make every grain effective during drilling.
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Xu, Liang, Yi Bo Liu, Xiao Li Luo, Wen Kai He, and Xue Wei Deng. "Preparation and Drilling Performance of Orderly Arranged Diamond Bit." Materials Science Forum 972 (October 2019): 241–44. http://dx.doi.org/10.4028/www.scientific.net/msf.972.241.
Повний текст джерелаАнотація:
This paper introduces the application of orderly arranged diamond bit and the technology of realizing diamond orderly arrangement in bit. Two kinds of conventional bits and one bit with diamond orderly arrangement were used in the test to drill reinforced concrete. By experimental results: under the same conditions (same matrix, same diamond grade and concentration), the drilling speed of orderly arranged diamond bit is increased by 13.1%, the life is increased by 11.5%, compared with the conventional diamond bit. The drilling speed of orderly arranged diamond bit is increased by 15.8%, the life is increased by 8.9%, compared with the conventional bit which the matrix is same but the diamond concentration is 5% higher. On the basis of saving diamond and reducing cost of bit, orderly arrangement can still improve the efficiency and life of drill bit, it embodies the superiority of diamond bit with diamond orderly arrangement.
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RATOV, B. T., B. V. FEDOROV, A. E. KUTTYBAYEV, S. E. KOIBAKOVA, and A. R. BORASH. "SCIENTIFIC FOUNDATIONS OF THE CREATION OF DIAMOND DRILLING TOOLS OF THE RING TYPE." Neft i Gaz 130, no. 4 (August 15, 2022): 58–73. http://dx.doi.org/10.37878/2708-0080/2022-4.04.
Повний текст джерелаАнотація:
To solve the mentioned problem of accelerated commissioning of minerals occurring in hard rocks, studies have been carried out to formulate the following recommendations for the creation of high-performance diamond bits: - the crown matrix should contain several (five or more) impregnated diamond-bearing layers in height, separated by diamond-free layers of significantly lower hardness (for example, VK-20 hard alloy); - each diamond impregnated layer of the matrix must have a "comb" profile, representing annular wedge-shaped protrusions and depressions; - the impregnated diamond layers of the matrix during drilling should be equally loaded along the radius of the bit, which makes it possible to increase the wear resistance of the tool and reduce the number of rough diamonds for the manufacture of the latter; - to maintain the diameters of the well and the drilled core, the inner and outer side surfaces of the matrix must be equipped with wear-resistant diamond inserts (for example, from tvesala); - to produce a high-quality wear-resistant matrix, small amounts of various components should be added to the composition of the binder of the 94WC + Co + Cu type diamond grains. Recommendations 1-4 are embodied in the design of diamond impregnated crowns, for which the Republic of Kazakhstan has received patents. Crowns have been introduced into production with a significant effect. A diamond crown has been developed and patented, the impregnated layers placed in a matrix on a three-start helical surface with a slight pitch of 0.8 - 1.2 mm. It is expected that with this design, the pre-fracture zone will be involved in the bottom hole destruction process, which lies under the intrusion zone and represents a hard rock broken and weakened by cracks to a depth ten times greater than the intrusion depth of diamond grains. An experimental batch of multilayer crowns with an equally loaded comb profile and placement of impregnated layers on a three-start helical surface was made using software and CNC (numerical control) machines.
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Li, Zhan Tao, Yong Zheng Ma, and Ken-ichi Itakura. "Development of a Rotary Drilling Mechanism for Impregnated Diamond Bits." Advanced Materials Research 989-994 (July 2014): 3136–39. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.3136.
Повний текст джерелаАнотація:
Impregnated diamond core bits are often used in core drilling for geological surveys. A tri-state theory is proposed to describe the three states in drilling processes for a diamond particle or a bit. These states are contacting state, cutting state, and ploughing state. Furthermore, the relations among thrust and other mechanical parameters are also summarized. The optimal value of the specific energy is in the cutting state. Several experiment results verified the proposed model. This mechanism is useful for selecting operation parameters in core drilling using impregnated diamond core bits.
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Quan, Yan Ming, Jia Jia Chen, and Hao Xu. "The Investigation on Small Hole Drilling-Grinding in Glass and Ceramic." Advanced Materials Research 126-128 (August 2010): 258–62. http://dx.doi.org/10.4028/www.scientific.net/amr.126-128.258.
Повний текст джерелаАнотація:
Making holes in glass or ceramic with conventional twist drills is difficult because of the hard and brittle properties of the workpieces, but the drilling-grinding process with diamond core-tools has found application in the field due to its high efficiency and low cost. However, small hole drilling-grinding with the core tools is still a challenge because the small core tools have a limited strength and chip-removal capacity. In this paper, the small hole drilling-grinding in glass and ceramic by diamond core-tools with 4mm diameter is experimentally investigated, the drilling-grinding force and heat are measured and calculated, the performances of two types of electroplating diamond core tools are compared.
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Song, Dongdong, Zhangping Ren, Yingxin Yang, Yousheng Chen, Gao Nie, Leichuan Tan, Hao Peng, et al. "Drilling performance analysis of impregnated micro bit." Mechanical Sciences 13, no. 2 (October 19, 2022): 867–75. http://dx.doi.org/10.5194/ms-13-867-2022.
Повний текст джерелаАнотація:
Abstract. The cutting mechanical properties of impregnated diamond bit depend on the performance of its cutting elements. Aiming at the factors affecting the cutting element performance of impregnated diamond bit, the laboratory rock breaking experiment of impregnated micro bit is carried out. The results show that the breaking work ratio and unit wear first decrease and then increase with the increase of diamond particle size and concentration when drilling sandstone; the rock breaking efficiency and wear resistance are the highest when the concentration is 125 %. The breaking work ratio first decreases and then increases with the increase of diamond particle size when drilling limestone; the rock cutting efficiency is the highest when the concentration is 100 %. With the increase of diamond particle size, the breaking work ratio increases and the unit wear decreases when drilling granite; the rock cutting efficiency and wear resistance are the highest when the concentration is 150 %.
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Lee, Kingsun. "Prediction of Crack for Drilling Process on Alumina Using Neural Network and Taguchi Method." Advances in Materials Science and Engineering 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/304691.
Повний текст джерелаАнотація:
This study analyzes a variety of significant drilling conditions on aluminum oxide (withL18orthogonal array) using a diamond drill. The drilling parameters evaluated are spindle speed, feed rate, depth of cut, and diamond abrasive size. An orthogonal array, signal-to-noise (S/N) ratio, and analysis of variance (ANOVA) are employed to analyze the effects of these drilling parameters. The results were confirmed by experiments, which indicated that the selected drilling parameters effectively reduce the crack. The neural network is applied to establish a model based on the relationship between input parameters (spindle speed, feed rate, depth of cut, and diamond abrasive size) and output parameter (cracking area percentage). The neural network can predict individual crack in terms of input parameters, which provides faster and more automated model synthesis. Accurate prediction of crack ensures that poor drilling parameters are not suitable for machining products, avoiding the fabrication of poor-quality products. Confirmation experiments showed that neural network precisely predicted the cracking area percentage in drilling of alumina.
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Nguyen, Thao Xuan, Tuan Tran Nguyen, and Nam Van Le. "Study on the wear mechanisms and rock destruction of core surface set bit in drilling for solid mineral exploration." Journal of Mining and Earth Sciences 62, no. 3a (July 10, 2021): 30–36. http://dx.doi.org/10.46326/jmes.2021.62(3a).04.
Повний текст джерелаАнотація:
In this paper, the authors present some research results of wearing process and rock destruction by diamond grit of core bit depending on drilling regime, rock hardness, diamond grit strength, etc. through the simulation of the interaction effect between diamond grit attached to the core bit and the rock. The relationship of the wear rate and rate of penetration of diamond core bit to the rotation per minute has been tested. On the basis of the research results, the authors have proposed solutions to select the appropriate technology for diamond drilling to improve the efficiency of solid mineral exploration in Vietnam.
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Er, Nilay, Alper Alkan, Serim Ilday, and Erman Bengu. "Improved Dental Implant Drill Durability and Performance Using Heat and Wear Resistant Protective Coatings." Journal of Oral Implantology 44, no. 3 (June 1, 2018): 168–75. http://dx.doi.org/10.1563/aaid-joi-d-16-00114.
Повний текст джерелаАнотація:
The dental implant drilling procedure is an essential step for implant surgery, and frictional heat in bone during drilling is a key factor affecting the success of an implant. The aim of this study was to increase the dental implant drill lifetime and performance by using heat- and wear-resistant protective coatings to decrease the alveolar bone temperature caused by the dental implant drilling procedure. Commercially obtained stainless steel drills were coated with titanium aluminum nitride, diamond-like carbon, titanium boron nitride, and boron nitride coatings via magnetron-sputter deposition. Drilling was performed on bovine femoral cortical bone under the conditions mimicking clinical practice. Tests were performed under water-assisted cooling and under the conditions when no cooling was applied. Coated drill performances and durabilities were compared with those of three commonly used commercial drills with surfaces made from zirconia, black diamond. and stainless steel. Protective coatings with boron nitride, titanium boron nitride, and diamond-like carbon have significantly improved drill performance and durability. In particular, boron nitride-coated drills have performed within safe bone temperature limits for 50 drillings even when no cooling is applied. Titanium aluminium nitride coated drills did not show any improvement over commercially obtained stainless steel drills. Surface modification using heat- and wear-resistant coatings is an easy and highly effective way to improve implant drill performance and durability, which can improve the surgical procedure and the postsurgical healing period. The noteworthy success of different types of coatings is novel and likely to be applicable to various other medical systems.
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Huang, Hui, Chong Fa Huang, and Xi Peng Xu. "Force Characteristics in Drilling of Engineering Ceramic with a Brazed Diamond Tool." Key Engineering Materials 359-360 (November 2007): 153–57. http://dx.doi.org/10.4028/www.scientific.net/kem.359-360.153.
Повний текст джерелаАнотація:
An experimental study was carried out to investigate the force in drilling of engineering ceramic with a brazed diamond tool. The drilling forces and protrusion heights of diamond grains were measured. The results showed that the variation of cutting forces, increasing with the cutting time, was divided into three phases for a drilled hole. For each phase, the variation of cutting forces was different. The drilling forces also increased with the numbers of drilled holes due to the wear of diamond grits. The distance values of the cutting force between the end of first phase and the end of second phase approximately kept constant.
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Zhang, Xu Liang, You Hong Sun, Yuan Chun Liao, Wen Jiang, Jin Fan Li, and Qing Nan Meng. "Bending Strength and Cutting Performance of WB-Coated-Diamond/Fe-Ni Composites." Materials Science Forum 993 (May 2020): 1065–74. http://dx.doi.org/10.4028/www.scientific.net/msf.993.1065.
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Diamond particle with tungsten boride (WB) coating was synthesized by the molten salt method. Three different diamond/Fe-Ni composites made from pristine diamond, B4C coated diamond and WB coated diamond with Fe-Ni powders were prepared by powder metallurgy. The composition and microstructure of the tungsten boride coating were investigated. Both bending strength and cutting performance of the composites were investigated. Addition of the WB coating provided an increased bending strength (871.2 MPa) and relative density (93.54%), compared with the composites consist of uncoated diamond and Fe-Ni (746.8 MPa, 92.81%). Three different Fe-Ni-based impregnated diamond drill bits contained 20 vol.% pristine diamond, B4C coated diamond and WB coated diamond were manufactured by powder metallurgy, respectively. Drilling rate of bits was measured by XY-4 geological core drill on granite. The test results show that the drilling rate of bits with WB coated diamond (2.42 m/h) was 40% higher than that with pristine uncoated diamond (1.72 m/h).
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Liu, Qiong, Guoqin Huang, and Yongchao Xu. "Investigation of drilling 2D C<sub>f</sub>∕C–SiC composites with brazed diamond core drills." Mechanical Sciences 11, no. 2 (October 12, 2020): 349–56. http://dx.doi.org/10.5194/ms-11-349-2020.
Повний текст джерелаАнотація:
Abstract. Drilling carbon fiber reinforced silicon carbide composites still forms a big challenge for machining because of their special braided structure and anisotropy. In this study, through the drilling of 2D Cf∕C–SiC composites, two kinds of brazed diamond core drills with different abrasive distributions were compared. The results showed that the drilling force and torque of the two drills decreased with the increase in the spindle speed and increased with the increase in the feed speed. Under the same drilling conditions, the drilling force and torque of the brazed diamond drill with the ordered abrasive distribution were far lower than those of the brazed diamond drill with the random abrasive distribution. Also, the quality of the holes drilled by the drill with the ordered abrasive distribution was better than that of the holes drilled by the drill with the random abrasive distribution, which is attributed to the uniform abrasive spacing provided by the drill with the ordered abrasive distribution.
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Pan, Bing Suo, Xiao Hong Fang, and Yong Chang Tian. "Electrodeposition of Fe-Diamond Composite Material for Manufacture of Diamond Tools." Applied Mechanics and Materials 37-38 (November 2010): 398–401. http://dx.doi.org/10.4028/www.scientific.net/amm.37-38.398.
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For machining of hard and brittle materials, iron electrodeposit is a kind of matrix material with potential advantages for manufacture of diamond tools. Aiming at the problem of difficult codeposition of diamond in iron deposit, this paper adopts orthogonal design of experiment to study the effects of solution pH value, cathodic current density, alkylphenol polyoxyethylene (10) ether (OP-10) concentration and ammonium chloride concentration on codeposition of diamond, and then Fe-based diamond bits were fabricated and drilling tests in granite were carried out. The results show that pH value, cathodic current density, OP-10 concentration and ammonium chloride concentration all have statistically significant effect on codeposition of diamond in iron deposit, whose contributions to the variance of the weight of codeposited diamond are 37.45%, 32.05%, 13.13% and 12.38%, respectively. The result of drilling test indicates that Fe-based diamond bit can achieve much higher penetration rate than common Ni-based diamond bit.
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Lan, Hong, Qi Xue, and Cheng Yu Cui. "Analysis and Test: Impregnated Diamond Cutters for Oil Drilling Bit." Applied Mechanics and Materials 496-500 (January 2014): 448–51. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.448.
Повний текст джерелаАнотація:
Systematic testing methods of the performance of diamond/metal composite drilling segments (impregnated diamond cutters) have not come into being. This article tries to test the mechanical properties, structures and component of a certain number of impregnated diamond cutters; focuses on analysis of the relationship between the performance of typical composite diamond cutters and materials’ structures, intends to study the testing methods of impregnated diamond cutters’ performance.
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Tian, Jialin, Gang Liu, Lin Yang, Chunming Wu, Zhi Yang, and Changfu Yuan. "The wear analysis model and rock-breaking mechanism of a new embedded polycrystalline diamond compact." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 22 (August 17, 2016): 4241–49. http://dx.doi.org/10.1177/0954406216664755.
Повний текст джерелаАнотація:
Polycrystalline diamond layer peel-off is a hot topic in oil and gas drilling engineering. When an integrated polycrystalline diamond compact cutter suffers overload, there is a rapid decline in its rock-breaking performance and drilling rate of penetration. To modify the comprehensive performance of polycrystalline diamond compact, we innovatively propose a new embedded polycrystalline diamond compact. According to geometric analysis theory combined with the linear combination rule, the three typical embedded design schemes – the imitation palm-shaped, imitation Z-shaped and ring-embedded designs – are discussed. The influences of the number, size, location and combination of the embedded polycrystalline diamond layer on the polycrystalline diamond compact wear mechanism and rock-breaking performance are analysed. The results show that the embedded element and carbide matrix are combined by brazing welding, which not only exerts high abrasion resistance on the polycrystalline diamond layer but also combines with the good impact performance of carbide matrix. Compared with ordinary polycrystalline diamond compact, the intake amount of a single-embedded polycrystalline diamond compact is smaller, and it wears more evenly during the rock-breaking process. Comparing the results from before and after drilling, it effectively prevents the ordinary polycrystalline diamond compact from easily peeling off when suffering overload. The unique wear analysis model can be applied to other types of polycrystalline diamond compact by adjusting the embedding method. The research conclusions provide useful insights into the study of the polycrystalline diamond compact wear mechanism and rock-breaking performance.
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Zhang, Jian Guo, Ben Wang, Fang Hong Sun, and Hang Gao. "Improvement on the Cutting Performance of CVD Diamond Coated Drills in Drilling CFRP." Key Engineering Materials 499 (January 2012): 366–71. http://dx.doi.org/10.4028/www.scientific.net/kem.499.366.
Повний текст джерелаАнотація:
Carbon fiber reinforced plastics (CFRP) is difficult to machine because of the extremely abrasive nature of the carbon fibers and its low thermal conductivity. CVD diamond films have many excellent properties such as wonderful wear resistance, high thermal conductivity and low friction coefficient, therefore depositing diamond films on the surface of drills is thought to be an effective way to elongate the lifetime of drills and improve the cutting performance. In this study, diamond films are deposited on the WC-Co drill using hot filament chemical vapor deposition (HFCVD) method. The results of characterization by the scanning electron microscope (SEM) and Raman spectrum indicate that the fabricated CVD diamond coated drill is covered with a layer of uniform and high-purity diamond films. The cutting performance of as-fabricated CVD diamond coated drill is evaluated in dry drilling CFRP, comparing with the uncoated WC-Co drill. The results demonstrate that the CVD diamond coated drill exhibits much stronger wear resistance. Its flank wear is about 50μm after drilling 30 holes, about one-third of that of WC-Co drill. Machining quality of the exit and internal wall of drilled holes shows better surface finish obtained by coated drill, which suggests that CVD diamond coated tool has great advantages in drilling CFRP.
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Vorobieva, M. V., S. A. Perfilov, A. A. Pozdnyakov, R. L. Lomakin, and V. D. Blank. "New features of rock-cutting tools equipped with diamond-carbide cutting elements." Voprosy Materialovedeniya, no. 1(101) (May 3, 2020): 74–84. http://dx.doi.org/10.22349/1994-6716-2020-101-1-74-84.
Повний текст джерелаАнотація:
The paper describes conducted feasibility study and scientific and technical basis for creation of technology for drilling tools with diamond-carbide cutting elements. The results of technological processes of production of diamond-carbide inserts (DCI) manufactured by Technological Institute for Superhard and Novel Carbon Materials (TISNUM), which are designed for operation and implementation in various drilling conditions were presented. The DCI differentiated physic-chemical and performance characteristics, depending on the physic-mechanical properties of rocks formations, the particular construction of wells and other drilling conditions. A complex of studies of physical and mechanical properties of DCI, their relationship with the structural and technological factors, performance of bits equipped with DCI, the nature of bits wear were conducted, including pilot testing of new polycrystalline diamond compact bits (PDC bits) with polycrystalline diamond cutters produced by TISNUM at the facilities of JSC Gazprom Neft. The possibilities of industrial production of DCI and premium drilling bits on the basis of TISNUM technologies are shown, which will ensure demands of the Russian oil and gas industry, allowing import dependence elimination, and in future start of export. Ultimately, by 2025, with the help of new technologies, it will be possible to occupy up to 25– 30% of the global market for drilling tools and equipment.
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Zhao, Hong Shan, and Kun Zhang. "Development and Application of a Cutting - Abrasive Impregnated Diamond Bit." Advanced Materials Research 900 (February 2014): 570–74. http://dx.doi.org/10.4028/www.scientific.net/amr.900.570.
Повний текст джерелаАнотація:
Igneous rocks of Junggar Basin are hard, strong abrasive and poor drillability. ROP is low in drilling these rocks, and drilling cycle is long, which seriously affect the process of exploration and development in the Carboniferous reservoir. Considering the igneous rock formation characteristics and the drilling problems, using PDC impregnated diamond high strength, super abrasion as the main rock breaking device, a new type of cutting and grinding of diamond impregnated bit was developed. This bit has the following characteristics: Compound cutting structure with blades and cylindrical Impregnated cutters; big nozzle in the center + deep radiation water slot hydraulic structures; Natural diamond and TSP lengthened gauge design; Selection of 40/50 mesh diamond grit, mix two kinds of inserts with diamond concentration 70%.The bit has the combination of impregnated bit and PDC drill bit technical advantages, which improve the bit adaptability to the formations. Hassan3 Carboniferous igneous formations field test shows that: average ROP is 0.71m / h, single bit footage is 86.5m, which increased by about 20% and 302% respectively compared with high efficient three-roller bits. The success usage of this bit in Hassan 3 provide an effective means for high quality fast drilling in Junggar Basin igneous rock formation.
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Guignard, Jérémy, Mythili Prakasam, and Alain Largeteau. "A Review of Binderless Polycrystalline Diamonds: Focus on the High-Pressure–High-Temperature Sintering Process." Materials 15, no. 6 (March 16, 2022): 2198. http://dx.doi.org/10.3390/ma15062198.
Повний текст джерелаАнотація:
Nowadays, synthetic diamonds are easy to fabricate industrially, and a wide range of methods were developed during the last century. Among them, the high-pressure–high-temperature (HP–HT) process is the most used to prepare diamond compacts for cutting or drilling applications. However, these diamond compacts contain binder, limiting their mechanical and optical properties and their substantial uses. Binderless diamond compacts were synthesized more recently, and important developments were made to optimize the P–T conditions of sintering. Resulting sintered compacts had mechanical and optical properties at least equivalent to that of natural single crystal and higher than that of binder-containing sintered compacts, offering a huge potential market. However, pressure–temperature (P–T) conditions to sinter such bodies remain too high for an industrial transfer, making this the next challenge to be accomplished. This review gives an overview of natural diamond formation and the main experimental techniques that are used to synthesize and/or sinter diamond powders and compact objects. The focus of this review is the HP–HT process, especially for the synthesis and sintering of binderless diamonds. P–T conditions of the formation and exceptional properties of such objects are discussed and compared with classic binder-diamonds objects and with natural single-crystal diamonds. Finally, the question of an industrial transfer is asked and outlooks related to this are proposed.
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Zhang, Cheng Long, Ping Fa Feng, Zhi Jun Wu, and Ding Wen Yu. "An Experimental Study on Processing Performance of Rotary Ultrasonic Drilling of K9 Glass." Advanced Materials Research 230-232 (May 2011): 221–25. http://dx.doi.org/10.4028/www.scientific.net/amr.230-232.221.
Повний текст джерелаАнотація:
Rotary ultrasonic machining process, regarded as one of the effective processing methods for hard-brittle materials, is introduced into drilling K9 glass in this paper. The effective cutting velocity, cutting depth, and cutting length of single diamond particle are determined by analyzing the kinematics characteristic of diamond tool in rotary ultrasonic drilling (RUD). Experiments are conducted to study the influences of process variables (spindle speed, feedrate) on cutting force, chipping size, and surface roughness in RUD. As comparison study, the processing performances between RUD and diamond drilling are also discussed. The experimental results show that the RUD process can significantly reduce cutting force and the value of chippings size, which inferred that RUD process can improve machining efficiency and make the machining cost lower. It is also concluded that the effective cutting depth of diamond particles is the main factor for surface roughness in RUD of K9 glass.
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Mu, Juan, Jiu Hua Xu, Yan Chen, and Yu Can Fu. "CFRP Drilling with Brazed Diamond Core Drill." Solid State Phenomena 175 (June 2011): 27–32. http://dx.doi.org/10.4028/www.scientific.net/ssp.175.27.
Повний текст джерелаАнотація:
Despite the facts that carbon fiber reinforced plastics (CFRP) components are mostly produced near net shape, machining, especially drilling is often required in order to bring the component into dimensional requirements and prepare it for assembly. Rapid drill wear and serious machining defects are the key problems in CFRP drilling, and employing proper drill is an effective way to solve these problems. In this paper, tests of the brazed diamond core drill are presented and the related issues, such as the thrust force, the drilling quality and the drill wear are studied.
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Sun, Baichun, Andrej Bona, Binzhong Zhou, Andrew King, Christian Dupuis, and Roman Pevzner. "Seismic while drilling experiment with diamond drilling at Brukunga, South Australia." ASEG Extended Abstracts 2013, no. 1 (December 2013): 1–4. http://dx.doi.org/10.1071/aseg2013ab045.
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Mizobuchi, Akira, and Hitoshi Ogawa. "Through-Hole Drilling of Glass Plate Using Electroplated Diamond Tool." Applied Mechanics and Materials 52-54 (March 2011): 384–88. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.384.
Повний текст джерелаАнотація:
Hard and brittle materials such as ceramics and glass are not only difficult-to-machine but also occur easily cracks at the exit surface in through-hole drilling. This paper deals with through-hole drilling of glass plate for plasma display panel using an electroplated abrasive grain tool in order to find out drilling conditions for smaller cracks, higher drilling efficiency and longer tool life. In particular, the influence of the crack in two kinds of abrasive grain is examined. The main conclusions obtained in this study are as follows. The crack in diamond grain tool is smaller than that in CBN grain tool. Moreover, the tool life of diamond grain tool is longer than that of CBN grain tool. Adhered volume of chip increases with drilling numbers, so the crack size and the thrust force increases. The washing of tool is required in order to restrain crack and force.
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Egashira, Kai, Ryohei Okina, Keishi Yamaguchi, and Minoru Ota. "Drilling of Microholes Using Diamond Grinding Tools." Advanced Materials Research 1136 (January 2016): 435–39. http://dx.doi.org/10.4028/www.scientific.net/amr.1136.435.
Повний текст джерелаАнотація:
The drilling of microholes in hard and brittle materials by ultrasonic grinding was carried out using polycrystalline diamond (PCD) micropins fabricated by electrical discharge machining. They can be employed as micro-grinding tools because the convex parts of discharge craters formed on the tool surface can serve as cutting edges of abrasive grains in grinding wheels. In the drilling of crown glass, the increase in the grinding force and the generation of cracks and chippings at hole edges were suppressed owing to the high wear resistance of PCD. Under suitable conditions, drilling was also successfully performed in silicon, which is apt to exhibit cracks and chippings at hole edges.
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Tsysar, Maksym, Anatolii Zakora, Anton Babak, Sergii Ivakhnenko, Oleg Zanevskii, Halina Ilnitska, and Ievgeniia Zakora. "Dependence of static strength of large crystals of synthetic diamond type ib of octaedric habitus, after chemical-thermal time and time." Bulletin of the National Technical University «KhPI» Series: Dynamics and Strength of Machines, no. 1 (December 31, 2022): 9–14. http://dx.doi.org/10.20998/2078-9130.2022.1.253664.
Повний текст джерелаАнотація:
Increasing demands on the quality of drilling tools are forcing us to revise the traditional methods of their production and develop new alternative technologies. Some issues related to the possibility of increasing the efficiency of a drilling tool using diamond single crystals are considered. It has been suggested that a further reserve for improving the quality of drill bits lies in the use of large, high-strength, non-magnetic diamonds. Scientific research in this area has shown that the efficiency of the drilling process largely depends on the mechanical properties of single crystals, such as tensile strength and hardness. The grains operate under a load close to critical, which can lead to the complete destruction of single crystals instead of gradual chipping with the formation of new cutting edges. The results of an experimental study of the influence of individual stages of the drilling tool manufacturing process, namely, chemical-thermal treatment and annealing at 1150°C, on the static strength of large type Ib synthetic diamond crystals with an octahedral habit are presented. The dependence of this quantity on the geometric dimensions of single crystals was obtained for the first time. The achieved maximum value of static strength was 8750 N. It was experimentally confirmed that with an increase in the breaking load, the size of the fragments decreases. In order to ensure sufficient strength of the cutting part of the drilling tool, it is advisable to limit the size of single crystals to 1000–1200 µm, since the critical load values for them are higher than for crystals whose size is 1300 µm or more, which, according to the theory, is associated with an increase in the number of defects and inclusions in proportion to size. The performed analysis made it possible to make adjustments to aspects of the manifestation of the scale effect when testing the strength properties of diamond single crystals.
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Zhang, Guofa, and Haidong Jiang. "Development of Impregnated Diamond Bit with Primary and Secondary Abrasives Based on Matrix Weakening Theory." Annales de Chimie - Science des Matériaux 45, no. 3 (June 30, 2021): 259–65. http://dx.doi.org/10.18280/acsm.450310.
Повний текст джерелаАнотація:
Along with economic advancement, diamond bit is widely used in mine exploration and engineering geological investigation. To reduce the cost of impregnated diamond bit and improve its drilling efficiency in highly abrasive formation, this paper designs a diamond bit based on matrix weakening theory, and prepares the matrix from high-grade diamond abrasives and SiC particles. Through theoretical calculation, diamond bits were designed with six different formulas of diamond concentrations and weakened SiC particle concentrations. The theoretical analysis shows that the weakened SiC particle concentration fell within 0-50%; the number of diamond particles dropped from 750,115 to 375,150, saving the diamond cost by 50%. To further explore the life, drilling efficiency, and working mechanism of diamond bit, the apparent form of bit materials was analyzed through field tests, using EPMA-1720 electron probe microanalyzer and GENSIS60 energy spectrometer. The field tests show that: the proposed bit, with 35% of matrix skeleton and 65% of bonding metal, improved the drilling efficiency of ordinary impregnated diamond bit by 68%, while reducing the service life by merely 30%. The apparent form analysis shows that: In the diamond bit designed by matrix weakening theory, the weakened SiC particles could easily fall off the matrix surface, leaving recoverable pits on the surface. The non-smooth form weakens the abrasion resistance of the matrix, reduces the contact area between the crown of the drill bit and the rock surface at the hole bottom, and increases the pressure of the crown on the rock per unit area. The fallen wakened particles participate in the abrasion of the matrix at the hole bottom, improve the grinding ability of the rock powder at hole bottom, and promote the protrusion of new diamond particles in the matrix.
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Wen, Quan, Hang Gao, D. Zhao, and Dong Ming Guo. "Drilling C/E Composites with Electroplated Diamond Abrasive Tool and its Damage Evaluation Method." Key Engineering Materials 487 (July 2011): 371–75. http://dx.doi.org/10.4028/www.scientific.net/kem.487.371.
Повний текст джерелаАнотація:
Carbon/epoxy (C/E) composites have been widely used in aerospace and automotive industry. However, they are prone to appear damages such as burr, spalling, delamination during drilling process. This paper presents an electroplated diamond abrasive drilling (EDAD) technology to reduce these damages. With this technology, C/E composites are removed by the action of the motion of small diamond particles attached to a core drill body. In order to represent the drilling damages, a new evaluation method is proposed taking comprehensive consideration of burr, spalling and delamination. The method is verified by analyzing the damages of drilled holes. Results indicate that the evaluation method proposed in this paper is applicable to characterize the level of drilling damages reasonably and effectively.
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Gao, Chao, Guorong Wu, and Sheng Wang. "Drilling Mechanism Investigation on SiC Ceramic Using Diamond Bits." Open Mechanical Engineering Journal 11, no. 1 (June 30, 2017): 25–36. http://dx.doi.org/10.2174/1874155x01711010025.
Повний текст джерелаАнотація:
Background: SiC ceramic have been widely used in the fields of armor protection, but SiC ceramic is one of the difficult-to-machine material for its high hardness and low fracture toughness. Objective: This paper presents an investigation of drilling mechanism on SiC ceramic using diamond bits. Method: Based on the theory of indentation fracture mechanics model, cutting average load model and cutting average depth model for single particle were established, theory analysis of drilling mechanism was carried out; through scanning electron microscope (SEM) observation, experimental removal mechanism was discussed. Results and Conclusions: The results show that, brittle fracture is the dominant way for SiC ceramic’s removal mechanism, plastic deformation always exists during the drilling process. Brittle fracture includes cleavage fracture, transgranular fracture, intergranular fracture, material peeling off and grain boundary breakage; resintering and recrystallization happen under the joint action of grinding forces and grinding heat in the contact area, where plastic flow characteristics also appear; powdering removal is accompanied by the drilling process; cleavage fracture and transgranular fracture occur on intergranular pores and grain boundary; residual cracks are found in the drilling surface resulted by drilling stress and high temperature.
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Ma, Yu Ping, Gen Fu Yuan, and M. Chen. "Fabrication and Cutting Performance of Ultrafine Grain Composite Diamond Coated Drills." Advanced Materials Research 188 (March 2011): 387–91. http://dx.doi.org/10.4028/www.scientific.net/amr.188.387.
Повний текст джерелаАнотація:
Ultrafine grain composite diamond films are deposited on the WC-Co-based drills using a bias-enhanced hot filament CVD system. During the deposition, the spiral hot filaments and novel two-step pretreatment method for complicated shape tools are adopted. The composite structure is achieved by regulating the concentration of Ar in a mixture of acetone and a hydrogen gases at different stages. The surface morphologies and composition of the first fabricated microcrystalline diamond film and the ultrafine grain diamond film grown later are observed with different techniques. The composite films have the advantages of good adhesive strength and low surface roughness. The cutting performance of the composite diamond-coated drills is investigated by drilling SiC particles reinforced aluminum matrix composites. The drilling life is improved greatly compared with those of uncoated drills and microcrystalline diamond coated drills.
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Dudlia, Mykola, Jan Pinka, Kateryna Dudlia, Valerii Rastsvietaiev, and Marina Sidorova. "Influence of Dispersed Systems on Exploratory Well Drilling." Solid State Phenomena 277 (June 2018): 44–53. http://dx.doi.org/10.4028/www.scientific.net/ssp.277.44.
Повний текст джерелаАнотація:
Results of theoretical, laboratory and stand study which enabled to recommend solutions of surface active substances while well drilling, taking into account mining and geological conditions of a number of Ukrainian regions are given. It was determined that addition of surface active substances to the drilling fluid during rotary drilling by hard-face and diamond cores makes it possible to increase drilling rate.