Journal articles: 'Drill spiral'

1

Li, Chao, Min Wang, and Dun Wen Zuo. "Research on Theory and Technique of Point Form Grinding for Quadratic Surface Flank of Twist Drill." Key Engineering Materials 315-316 (July 2006): 56–60. http://dx.doi.org/10.4028/www.scientific.net/kem.315-316.56.

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A new principle and technology of point form grinding for quadratic surface flank of twist drill was investigated. It broke through the traditional straight-line generator grinding method for the conical and the spiral drills. The principle of implementation mechanism was given in the paper. The trueness and feasibility of the method had been approved in the experiments, and the quadratic surface twist drill such as hyperboloid, ellipsoid and hyperboloid-ellipsoid compound flank had been grinded on the mechanism.

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Li, Zhi Gang, Shi Tong Ge, and Zhi Chuan Guan. "Analysis of Acoustic Propagation Characteristic of Near-Bit Drill Tools." Advanced Materials Research 524-527 (May 2012): 1335–38. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.1335.

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In order to Make Use of Acoustic Wave to Transmit the Information from near- Bit End to a Remote Bit End, Using the Finite Element Method, Simulate and Analyze the Acoustic Wave Propagating Characters of Common near-bit Drill Tools: Ordinary Drill Collar, Spiral Drill Collar, Integral Straight Edge Stabilizer, Integral Spiral Stabilizer and Screw Drill. the Results Show that: because the Form and Size of Axial Cross Section Are in Basic Consistent, the Ordinary Drill Collar and Spiral Drill Collar Not only Have Better Characteristics in Time Domain, No Repeated Oscillation of Waveform Occurring, but Also Have Wider Bandwidth (up to 4KHz), and because of the Stabilizer Section, the Acoustic Impedance in the Axial Direction Discontinuities and the Time Domain Waveforms of other Three Kinds of Drilling Tools Appear that Not only Waveforms Have Shook Repeatedly, but Also the Width of the Pass Band Has Narrowed Significantly.

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Zhang, Gao Wei, Guan Wei Zhang, and Qing Zhang. "Research on Spiral Drill Stabilizer Wear-Resisting Layer Repair Technology." Applied Mechanics and Materials 157-158 (February 2012): 373–76. http://dx.doi.org/10.4028/www.scientific.net/amm.157-158.373.

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This paper introduced the repair methods of wear-resistant layer of the drilling tool stabilizer, and proposed a simple fitting method for spiral drill stabilizer wear belt, fitting of spatial spiral surface is essence of the space spiral curve fitting, for a pitch fixed spiral can be expanded to two-dimensional line, and then using interpolation technique can control drill stabilizer and repair work head of joint motion, the synthesis of these two motions is the space spiral.

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Xu, Lan Ying, Qiang Wu, Yu Zhong Li, and Pei Xin Qu. "Study on Chip Morphology of Electric Hot Minipore Drilling." Applied Mechanics and Materials 155-156 (February 2012): 596–600. http://dx.doi.org/10.4028/www.scientific.net/amm.155-156.596.

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Based on the electric hot drilling and ordinary drilling to drill small hole for hard-to-cut materials stainless steel, the chip morphology and microstructure were studied, the cutting deformation coefficient of the ordinary drilling is bigger, and the chip is not easy to discharge from spiral groove, while the cutting deformation coefficient of electric hot drilling is small, the chips are discharged smoothly along the spiral groove, experimental results show that the electric heating drilling improves capacity of chip breaking, and reduces drill fracture result from the chip obstruction, so it improves the service life of the drill bit.

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5

Qi, Bo, Pinlu Cao, He Yang, Wenbo He, Mengke Wang, Baoyi Chen, Kun Bo, and Zhichuan Zheng. "Experimental and Numerical Study on Air Flow Behavior for a Novel Retractable Reverse Circulation Drill Bit of Casing-while-Drilling (CwD)." Geofluids 2021 (August 21, 2021): 1–12. http://dx.doi.org/10.1155/2021/3586572.

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A reverse circulation Down-The-Hole (DTH) hammer drill bit in Casing-while-Drilling (CwD) processes is designed and applied to drilling under complicated formation. The drill bit is a special retractable drill bit with an exclusive reverse circulation gas channel. Using numerical simulations and experiments, the influence of the gas channel structure parameters of the drill bit, including the inner jet nozzles, flushing nozzles, suction channel, and other parameters, on its reverse circulation performance is analyzed, and the optimal gas channel structure parameters of the drill bit are determined to improve the reverse circulation effect. The results show that the flushing nozzles and inner jet nozzles have an important influence on entrainment performance. The entrainment rate η decreases as the flushing nozzle diameter increases and decreases as the inner jet nozzle diameter increases. An increase in the suction channel diameter can improve the reverse circulation effect of the drill bit. The spiral slot drill bit is more conducive to air being sucked into the central channel in the form of spiral flow, so it can improve the entrainment performance. The entrainment rate η can reach 23.4% with the optimum structured drill bit.

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6

Yang, Cheng, Jianliang Jiang, Bo Qi, Guoqing Cui, Liyong Zhang, Yunwang Chen, and Pinlu Cao. "Experimental and Numerical Analysis of Flow Behavior for Reverse Circulation Drill Bit with Inserted Swirl Vanes." Geofluids 2022 (January 10, 2022): 1–13. http://dx.doi.org/10.1155/2022/2472280.

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A swirling drill bit designed with an integrated vane swirler was developed to improve reverse circulation in down-the-hole hammer drilling. Its entrainment effect and influential factors were investigated by CFD simulation and experimental tests. The numerical results exhibit reasonable agreement with the experimental data, with a maximum error of 13.68%. In addition, the structural parameters of the swirler were shown to have an important effect on the reverse circulation performance of the drill bit, including the helical angle and number of spiral blades, swirler outlet area, and the flushing nozzles. The optimal parameters for the swirling drill bit without flushing nozzles include a helical angle of 60°, four spiral blades, and the area ratio of 2, while it is about 30°, 3, and 3 for the drill bit with flushing nozzles. Moreover, the entrainment ratio of the drill bit without flushing nozzles can be improved by nearly two times compared with one with flushing nozzles under the same conditions.

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Xu, Jing, Yan Xu, and Jia Chun Li. "Fatigue Life Analysis of Auger Stem in Soft Coal Seam." Applied Mechanics and Materials 472 (January 2014): 111–14. http://dx.doi.org/10.4028/www.scientific.net/amm.472.111.

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The complex force of the auger stem in soft coal seam is taken as the research object. Then the three-dimensional model of spiral pipe is established in the SOLIDWORKS software, and introduced into the workbench simulation platform of ANSYS software to simulate the stress distribution of the screw drill pipe in actual working conditions. According to the results of the analysis, the conclusion is that the stress concentration is around the pin hole of the female joint and the fatigue life of spiral drill pipe is 280.72 x 10 3 cycles.

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Shi, Run Ping, Cheng Yong Wang, and Xi Wang. "Preliminary Study on Carbon Fibre Composites Cutting Technology and Cutting Tools." Materials Science Forum 723 (June 2012): 25–29. http://dx.doi.org/10.4028/www.scientific.net/msf.723.25.

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Carbon fiber reinforced plastics (CFRP)/Ti super hybrid laminates are newly developed structural materials with excellent properties. But they are restricted in aircraft manufacturing because of their poor machining quality and short tool life. The machining quality and tool life are determined by machining ways, tool materials, drill point forms and drilling sequence. Spiral milling, drilling from Ti side, using the PCD tools and carbide drills with special point angle can improve the quality of hole and prolong tool life.

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9

Petukhov, Y. E., and A. A. Vodovozov. "Analysis of the influence of speed of cutting land on stability of a spiral drill bit and ways of its increasing." Izvestiya MGTU MAMI 7, no. 1-2 (March 10, 2013): 31–35. http://dx.doi.org/10.17816/2074-0530-67985.

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This article presents the analysis of the influence of cutting speed and the thickness of a cut layer on stability of a cutting land. Based on the analysis there is considered the design of the cutting part of a spiral drill bit with more uniform distribution of stability of cutting points, compared to a usual drill bit. The authors established the equation describing the projection of a cutting land onto a plane perpendicular to the axis of the drill bit.

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10

Pămîntaş, Eugen, Cristian Gheorghe Turc, and Felicia Veronica Banciu. "Three Edged Drill vs. Double - Edged Drill in Aluminium Parts Drilling." Advanced Materials Research 1036 (October 2014): 382–87. http://dx.doi.org/10.4028/www.scientific.net/amr.1036.382.

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This paper proposes an answer to a question like "it is better to use something new or use what we already know is a relatively recent technique novelty, which is found in tools manufacturer’s catalogues but still very rarely used, almost unknown in current industrial practice: spiral drill with three cutting edges. To give an endorsed answer, it starts machining a concrete case of a part of aluminium and research, based on a minimal experimental program, the processing with new drilling tool compared with the known helical drill. Answer the question initially is not simple, nor one given in few words and none with the high degree of generality, but one nuanced, depending on the performance indicators considered to be of interest and closeness of experimental working conditions than those found in current industrial environment. Helpful for the formulation and presenting the response is the processing of experimental data in the form of calculations, graphs and summary of the rejection’s causes. In this way, the concluding elements stand out more obvious and a number of partial answers can be formulated and justified recommendations can be done regarding: which of drills, where and in which conditions provides the best quality of machined hole, the best chip fragmentation and with the best ratio: price / quality / operation.

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11

Liu, Qi Xia, and Liang Fan. "The Combined Guiding Hole Technology of Large Diameter DTH Hammer and Long Screw-Pile Driver." Applied Mechanics and Materials 204-208 (October 2012): 181–87. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.181.

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From an engineering reality, in order to solve complex stratigraphic drilling problems and improve construction efficiency, the method of combination of large diameter DTH hammer and the pile driver with a special long spiral drill multifunctional is proposed. This method has the characteristics of simple equipment, fast, effective, low cost etc. It can quickly drill through layers of gravel, stone, weathered bedrock, reach to depth up to above 25m. It has been widely used in embedded engineering methods of precast piles, the long spiral rock-socketed piles, piles into the rock currently. The study of this construction method has not only wide range of applications, but also has a wide range of practical and theoretical significance.

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12

Liu, Qi Xia, and Liang Fan. "The Combined Guiding Hole Technology of Large Diameter DTH Hammer and Long Screw-Pile Driver." Applied Mechanics and Materials 190-191 (July 2012): 1220–26. http://dx.doi.org/10.4028/www.scientific.net/amm.190-191.1220.

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From an engineering reality, in order to solve complex stratigraphic drilling problems and improve construction efficiency, the method of combination of large diameter DTH hammer and the pile driver with a special long spiral drill multifunctional is proposed. This method has the characteristics of simple equipment, fast, effective, low cost etc. It can quickly drill through layers of gravel, stone, weathered bedrock, reach to depth up to above 25m. It has been widely used in embedded engineering methods of precast piles, the long spiral rock-socketed piles, piles into the rock currently. The study of this construction method has not only wide range of applications, but also has a wide range of practical and theoretical significance.

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13

Arifin, Zainal, Dominicus Danardono Dwi Prija Tjahjana, Rendy Adhi Rachmanto, Suyitno Suyitno, Singgih Dwi Prasetyo, and Trismawati Trismawati. "Redesign Mata Bor Tanah Untuk Pembuatan Lubang Biopori Di Desa Puron, Kecamatan Bulu, Kabupaten Sukoharjo." Mekanika: Majalah Ilmiah Mekanika 19, no. 2 (September 29, 2020): 60. http://dx.doi.org/10.20961/mekanika.v19i2.43393.

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<p><em>The lack of rainfall and the absence of catchment areas are the main factors of the lack of water in Puron Village. Making biopori becomes solutive because it is useful for water absorption, reducing standing water, composting containers, and fertilizing the soil. Artificial biopores are made by making holes in the ground using tools such as crowbars or using ground drilling machines. The use of aids model adapted to the drill bit based on the state of the soil contour. This research is focused on classifying drill bits and redesigning which is in accordance with the condition of the soil environment in Puron Village, Bulu District, Sukoharjo Regency. So that biopori holes can be created more effectively and efficiently. The research method was carried out through the classification of tool drill bits through the house of quality product (HOQ) and redesign using Autodesk Fusion 360 software application. It was found that the design with a screw drill model with a pointed spiral has a high product quality value and can applied in puron Village. The design of the drill bit by adjusting the contours of the Puron Village can make a 100 mm diameter biopori hole. The design specifications of the drill bit with steel cast with 12 spiral plates with a length of 1300 mm with a diameter of 115 mm can be driven with a 10 HP engine. The design results have maximum stress, displacement, reaction force and strain of 3.62 MPa, 0.00081 mm, 0.35 N, and 0.000015.</em></p>

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14

Li, Rui, and Albert J. Shih. "Tool Temperature in Titanium Drilling." Journal of Manufacturing Science and Engineering 129, no. 4 (April 1, 2007): 740–49. http://dx.doi.org/10.1115/1.2738120.

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The spatial and temporal distribution of tool temperature in drilling of commercially pure titanium is studied using the inverse heat transfer method. The chisel and cutting edges of a spiral point drill are treated as a series of elementary cutting tools. Using the oblique cutting analysis of the measured thrust force and torque, the forces and frictional heat generation on elementary cutting tools are calculated. Temperatures measured by thermocouples embedded on the drill flank face are used as the input for the inverse heat transfer analysis to calculate the heat partition factor between the drill and chip. The temperature distribution of the drill is solved by the finite element method and validated by experimental measurements with good agreement. For titanium drilling, the drill temperature is high. At 24.4 m/min and 73.2 m/min drill peripheral cutting speed, the peak temperature of the drill reaches 480°C and 1060°C, respectively, after 12.7 mm depth of drilling with 0.025 mm feed per cutting tooth. The steady increase of drill temperature versus drilling time is investigated.

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15

Afanasyev, A. E., V. R. Kargin, and B. V. Kargin. "Force conditions for light-alloy spiral-finned drill pipe extrusion." Izvestiya Vuzov Tsvetnaya Metallurgiya (Proceedings of Higher Schools Nonferrous Metallurgy), no. 2 (January 1, 2016): 58–63. http://dx.doi.org/10.17073/0021-3438-2016-2-58-63.

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16

Chen, Jia Sheng, Dong Wei, and Hai Shun Deng. "Improvement and Application Technology of Long Bedding Borehole Rig in Rockburst Seam at Headentry and Tailentry." Advanced Materials Research 1049-1050 (October 2014): 402–8. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.402.

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Advantages, disadvantages, and drilling adaptability of several rigs earlier used in domestic coal mine are analyzed. CMS1-800/30 crawler jumbo is reconstructed from standing pillar rig according to specific condition of long bedding borehole at coal face which possesses rockburst trend. Wide blade spiral drill pipe and Φ65mm diamond compact bit are used to drill long bedding borehole at headentry and tailentry. Drilling efficiency of long bedding borehole is greatly improved, and effect of relieving stress is very good. Safe and quick mining is ensured, and economic benefit is remarkable.

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17

E, Andrusenko. "ELASTIC BENDING OF A DRILL STRING IN AN ELLIPTICAL WELL WITH GEOMETRIC IMPERFECTIONS." National Transport University Bulletin 1, no. 48 (2021): 3–11. http://dx.doi.org/10.33744/2308-6645-2021-1-48-003-011.

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The problem is posed of determining the resistance forces and internal forces in the drill string during drilling and when performing tripping operations in a curved well. The object of the study is the geometry of the centerline of deep inclined well trajectories. The aim of the work is to formulate and solve new problems of structural mechanics about nonlinear deformation of drill strings in directional wells. To study the mechanics of elastic bending of drill strings in directional wells, the methods of structural mechanics of flexible curved rods were used; methods of differential geometry and theory of surfaces; numerical Runge-Kutta method. The study of the influence of geometric imperfections of the borehole centerline on the forces of contact interaction between the drill string and the borehole wall has been carried out. The case is considered when geometric imperfections have the form of a localized spiral of variable radius. KEY WORDS: OIL AND GAS WELLS, CURVED TRAJECTORY, DRILLING COLUMN, RESISTANCE FORCES.

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18

Karpyk, Roman, and Nazar Kostiuk. "Study of the processing of small diagnostic creations on a fluid sourcing by spiral survivals." Ukrainian journal of mechanical engineering and materials science 6, no. 1 (2020): 14–21. http://dx.doi.org/10.23939/ujmems2020.01.014.

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The article considers the features of the drilling process where there is a change in temperature, hole diameter, and displacement relative to the axis and the impact on the tool, when machining holes with high-speed steel drills there is wear of the transverse edge which is completely rounded to create a conical surface. There is a decrease in the negative value of the front corners on the transverse edge of the decrease in axial force, which led to a decrease in the intensity of wear of the transverse edge. In order of increasing axial force, respectively, and the intensity of wear of the transverse edge, were sharpened and recommended sharpening methods that provide high performance of the drill, the greatest stability, increased drilling accuracy, as well as the lowest cutting force. The analysis of influence of technological methods and ways and equipment on accuracy and quality of deep openings of small diameter is carried out. The effects of the method of lubricating coolant supply on the tool stability and processing productivity are investigated. The analysis of processing on the metal-cutting equipment with constructive development of the device is executed. Also, the stress-strain state of the drilling process by the finite element method with the analysis of external influences on the twist drill is carried out. The results of the research substantiate and recommend technological methods that reduce the deformation of the tool and, as a consequence, increase the quality and accuracy of the dimensions of deep holes of small diameter.

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19

Afanas’ev, A. E., V. R. Kargin, and B. V. Kargin. "Force conditions of pressing light-alloy drill pipes with spiral ribbing." Russian Journal of Non-Ferrous Metals 57, no. 3 (May 2016): 224–28. http://dx.doi.org/10.3103/s1067821216030020.

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20

Qu, Qing Wen, Cheng Jun Wang, and Xiao Dan Lou. "Study on Tension Spring of Track Hydraulic Drill Rig." Advanced Materials Research 204-210 (February 2011): 2206–9. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.2206.

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The intensity of the spring was adjusted with finite element method and the distributive laws of stress field and displacement field were obtained. Thus the maximum shear stress was got through the formula of spring intensity. So, two methods on analyzing the stress of cylinder spiral tension spring were introduced in this paper. One is the finite element method; the other is the formula of spring intensity. Then analyzing the spring deformation under load clarifies the function of the finite element method upon spring design, selection and strength check, and improves the reliability of spring design and shortens design time.

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21

Trakimas, Danielle R., Reuven Ishai, Elliott D. Kozin, Joseph B. Nadol, and Aaron K. Remenschneider. "Human Otopathology of Cochlear Implant Drill-out Procedures." Otolaryngology–Head and Neck Surgery 161, no. 4 (May 7, 2019): 658–65. http://dx.doi.org/10.1177/0194599819847636.

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Objective Human otopathology following drill-out procedures for cochlear implantation (CI) in cases with labyrinthitis ossificans (LO) has not been previously described. This study uses the high sensitivity of histopathology to (1) evaluate surgical drill-out technique with associated intracochlear findings and (2) quantify spiral ganglion neuron populations in a series of patients with LO who underwent CI. Study Design Retrospective otopathology study. Setting Otopathology laboratory. Subjects and Methods Temporal bone (TB) specimens from cases with evidence of preoperative intracochlear fibroossification that required a drill-out procedure for CI electrode array insertion were included. All cases were histopathologically evaluated and 3-dimensional reconstructions of the cochleae were performed to interpret drilling paths and electrode trajectories. Results Five TB specimens were identified, of which 4 underwent drill-out of the basal turn of the cochlea and 1 underwent a radical cochlear drill-out. In multiple TBs, drilling was imprecise with resultant damage to essential structures. Two TBs showed injury to the modiolus, which was associated with substantially decreased or even absent neuronal populations within these areas. In addition, 2 cases with inadequate drill-out or extensive LO of the basal turn resulted in extracochlear placement of electrode arrays into the vestibule due to persistent obstruction within the basal turn. Conclusion Otopathology highlights the challenges of drill-out procedures in cases of LO. Imprecise drilling paths, due to distortion of normal cochlear anatomy, risk injury to the modiolus and adjacent neurons as well as extracochlear placement of electrode arrays, both of which may contribute to poorer hearing outcomes.

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22

Wang, Ke, Yu Xiao Song, and Xing Wei Sun. "Dynamic Performance Analysis for Milling Head Box of Spiral Drill Collar Machine." Advanced Materials Research 605-607 (December 2012): 1236–39. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.1236.

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Milling head box is an important supporting part of spiral drill collar machine. Its dynamic performance has a big effect to the machine tool working accuracy. The three-dimensional (3D) model of milling head box was built in this paper. With finite element analysis software, the dynamic performance of the box was analyzed. The first six natural frequencies, relevant vibrations and mode shapes of the box were obtained. The results indicate that the milling head box structure is reasonable. No resonance will be induced during the machining process. It also provides thoughts and reference for further dynamic performance researches with practical significance.

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Li, Rui, and Albert J. Shih. "Spiral point drill temperature and stress in high-throughput drilling of titanium." International Journal of Machine Tools and Manufacture 47, no. 12-13 (October 2007): 2005–17. http://dx.doi.org/10.1016/j.ijmachtools.2007.01.014.

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Spaić, O., M. Vukčević, B. Marinović, A. Koprivica, and J. Jovanović. "Application validity of the technological procedure for making spiral drill-bit grooves." Materiali in tehnologije 55, no. 1 (February 12, 2021): 77–81. http://dx.doi.org/10.17222/mit.2020.071.

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Chen, Yong, Chuan He, Xu Zhou, and Hao Yu. "Analysis of factors affecting drilling friction and investigation of the friction reduction tool in horizontal wells in Sichuan." Advances in Mechanical Engineering 11, no. 7 (July 2019): 168781401986296. http://dx.doi.org/10.1177/1687814019862963.

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Based on field data and the related theories, the effects of drill string length, rotation speed, trajectory, and drilling fluid density on the friction during horizontal well drilling are analyzed in Sichuan. With increasing the length of drill string in the horizontal section, the friction grows. The drill pipe rotates faster and the torque decreases. Large undulation of borehole deviation and the “W” shape of the horizontal section lead to excessive friction. A higher fluid density causes higher torque and drag. Moreover, a friction reduction tool is designed to reduce friction, decrease the wear between the casing and the drill pipe joint, and prevent the differential pressure sticking, which improves the rate of penetration, and the specially designed spiral diversion channels improve the efficiency of borehole cleaning. The field experimental results have shown that the accumulated operational time of the friction reduction tool is more than 130 h and its fatigue life reaches up to 3 × 105 cycles. A plan of improving the tool structure is proposed to reduce the mud balling after the experiment. Finally, the mathematical model of calculating the spacing of the friction reduction tools is established, which provides technical support for investigating the friction in horizontal well drilling.

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Freigang, Viola, Maximilian Gottsauner, Markus Rupp, Christian Pfeifer, Stephan Grechenig, Alexander Kerner, Volker Alt, and Florian Baumann. "Surgical Drill Guide for Insertion of an Infra-Acetabular Screw Based on an Anatomically Precontoured Plate System: A Cadaveric Study." BioMed Research International 2021 (July 26, 2021): 1–7. http://dx.doi.org/10.1155/2021/2321504.

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Purpose. Due to the anatomic structure of the pelvis, free-hand placement of screws in the acetabular fracture management can be difficult. Infra-acetabular screw fixation increases acetabular stability by distal fixation of the cup. Aim of this cadaveric study is to investigate if a plate-referenced drill guide can provide save placement of an infra-acetabular screw over a precontoured suprapectineal quadrilateral buttress plate (SQBP). Methods. We constructed a drill guide for an infra-acetabular screw based on the surface of an anatomically precontoured SQBP. A total of 12 adult cadaveric acetabular specimens were used for drill guide-assisted placement of the infra-acetabular screw. The drill guide contains a radiopaque spiral to allow longitudinal fine adjustment of the SQBP along the pelvic brim to assure correct position of the plate-drill-guide construct in relation to the Koehler’s teardrop. After screw placement, we conducted a computed tomography (CT) scan of all specimens to assess the actual position of the screw in relation of the infra-acetabular corridor and the acetabular joint surface. Results. The position of the screw was within the infra-acetabular corridor in all cases. We did not see any intra-articular or intrapelvic screw penetration. The mean distance of the centerline of the screw to the medial border of the infra-acetabular corridor was 3.35 mm. The secure distance to the virtual surface of the femoral head to was 7.3 mm. Conclusions. A plate-referenced drill guide can provide safe placement of an infra-acetabular screw for treatment of acetabular fractures. Radiographic fine adjustment is necessary to access the optimal entry point.

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Ren, Fushen, Baojin Wang, Lei Zhao, and Anhe Zhu. "Experimental Investigation and Analysis of Dynamic Buckling of Drill String in Horizontal Well." Shock and Vibration 2017 (2017): 1–15. http://dx.doi.org/10.1155/2017/1658435.

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Buckling of tubulars has been the subject of many researches in the past. However, the models in previous research always followed the same assumptions: the friction and rotation effects are ignored. The assumptions are relatively far from the reality. This paper focuses on the rotational drill string in horizontal well. The differential equation of the dynamic buckling is established considering some various factors, including friction, the drill string-borehole interaction, and rotation, and the equations of the critical load of the sinusoidal buckling and the spiral buckling are derived. Furthermore, the friction curve of the drill string and the critical load of the dynamic buckling during rotation are obtained. In addition, the influence of the rotational speed on the dynamic buckling and the axis orbit of the dynamic buckling are also gained. The results show that the critical load of the sinusoidal buckling has nothing to do with the rotational speed while the amplitude and the frequency of the dynamic buckling become larger with the increase of the rotational speed, and the dynamic buckling presents a completely different state with the development of the axial load at different speed ranges.

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Zhang, Dong Su, and Li Hong Liu. "A Study on Speed of Fluid in Swirling Abrasive Jet Nozzle and Drilling Hole Performance." Advanced Materials Research 291-294 (July 2011): 3434–39. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.3434.

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By placing the whirling element in the nozzle body, swirling abrasive jet has been produced. The speed function of spiral groove and swirling contraction segment in inner of nozzle are analyzed. And the formulas of speed function are obtained. It is seen that movement of fluid in the spiral groove is regarded as spiral one-dimension axial symmetry, movement of fluid in the swirling contraction as spiral two-dimension axial symmetry. The swirling abrasive jet system has been established. The production method and the drilling test system of the swirling abrasive jet are introduced. The drilling mechanism of the swirling abrasive jet is analyzed. Through experiment, the effects of the whirling element structure and the jet parameters on drilling performance are studied. The results indicated that in the case of nozzle non-rotation, under the working pressure of 10 MPa, swirling abrasive jet can drill a deep hole on coal block of which Polodyakonov coefficient f is about 4, and that the diameter of the hole is 20~30 times the size of the nozzle exit diameter. So the swirling abrasive jet has a good drilling performance.

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Ostrovsky, Anatoliy. "IMPROVEMENT OF TECHNOLOGICAL PROCESS OF DRILLING THIN SHEET STEELS." ENGINEERING, ENERGY, TRANSPORT AIC, no. 4(111) (December 18, 2020): 48–54. http://dx.doi.org/10.37128/2520-6168-2020-4-5.

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This article considers the technological process of drilling holes in sheet metal. The existing typical technological process, with detailed analysis, provides grounds for substantiating the idea of an innovative solution. There is a connection between the improvement of economic indicators of this technological operation with the change of geometric parameters of the tool. The comparison of existing technological processes, operations, and transitions of production of round openings with the use of spiral drills is given. The traditional technique involves a clear sequence of the technological process with the use of tools for marking, kerning, and sequential use of screw drills of different diameters. Therefore, after the previous operation of marking the center of the two holes, perform the operation of kerning. The core (recess in the metal) prevents the deviation of the small diameter screw drill from the marking lines. After the above steps, the traditional technological process involves drilling a small diameter hole in order to direct the main tool in the right direction. To make the main hole perform special sharpening of the working part of the twist drill so that the diameter of the Central part of the tool is equal to the diameter of the first guide hole to avoid further displacement of the main hole and the next operation is to drill the hole to the desired diameter. As a result, the article raises the topic, given the widespread use of sheet metal, including in the agricultural sector, the feasibility of using an innovative idea to improve the technological process associated with the processing of sheet material, namely thin metal sheets. It is worth noting that for example, we consider a material that is characterized by its versatility, namely steel Ст 3. Despite the numerous sources devoted to the study of improving the drilling process, there are a number of issues, including the extension of this direction surfaces with a covering and without it, various thicknesses within the thin-walled hire. The most significant result of the improved technological process of drilling will be used in the system of efficient maintenance of agricultural machinery.

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Kliaus, Olga Nikolayevna, Aliaksandr Alekseyevich Zholobov, and Alexey Mikhailovich Fedorenko. "ON THE DISPLACEMENT OF SPIRAL DRILL AXES IN THE FORMATION OF RELATIVELY LONG HOLES." Вестник Белорусско-Российского университета, no. 3 (2021): 14–23. http://dx.doi.org/10.53078/20778481_2021_3_14.

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GOLOVIN, V. I., and S. YU RADCHENKO. "THRUST FORCE PREDICTION MODEL FOR DRILLING UNIDIRECTIONAL CARBON PLASTICS WITH WEAR OF THE CUTTING TOOL." Fundamental and Applied Problems of Engineering and Technology 2 (2021): 100–108. http://dx.doi.org/10.33979/2073-7408-2021-346-2-100-108.

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One of the most important tasks in the production of carbon fiber products is to ensure the specified accuracy and quality of the drilled holes. A model for predicting the thrust force, taking into account the degree of tool wear, is proposed. First, the geometric characteristics of the wear of the spiral drill tool are analyzed. Further, the contact conditions between the drill and the carbon fiber are determined in accordance with the geometric characteristics of the tool wear. Based on the mechanics of the contact interaction of surfaces, the thrust forces of the main cutting edges and the chisel edge are modeled, taking into account the degree of tool wear. The results obtained are integrated into the thrust force prediction model. An example of an experimental study of the drilling carbon fiber is given. The results obtained show a fairly accurate prediction of the cutting force, taking into account the wear of the cutting tool.

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Jiang, Hao, Caiwen Ma, Ming Li, and Zhiliang Cao. "Femtosecond Laser Drilling of Cylindrical Holes for Carbon Fiber-Reinforced Polymer (CFRP) Composites." Molecules 26, no. 10 (May 16, 2021): 2953. http://dx.doi.org/10.3390/molecules26102953.

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Ultrafast laser drilling has been proven to effectively reduce the heat-affected zone (HAZ) of carbon fiber-reinforced polymer (CFRP) composites. However, previous research mainly focused on the effects of picosecond laser parameters on CFRP drilling. Compared with a picosecond laser, a femtosecond laser can achieve higher quality CFRP drilling due to its smaller pulse width, but there are few studies on the effects of femtosecond laser parameters on CFRP drilling. Moreover, the cross-sectional taper of CFRP produced by laser drilling is very large. This paper introduces the use of the femtosecond laser to drill cylindrical holes in CFRP. The effect of laser power, rotational speed of the laser, and number of spiral passes on HAZ and ablation depth in circular laser drilling and spiral laser drilling mode was studied, respectively. It also analyzed the forming process of the drilling depth in the spiral drilling mode and studied the influence of laser energy and drilling feed depth on the holes’ diameters and the taper. The experimental results show that the cylindrical hole of CFRP with a depth-to-diameter ratio of about 3:1 (taper < 0.32∘, HAZ < 10 m) was obtained by using femtosecond laser and a spiral drilling apparatus.

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Yin, Yang, and Guo Fu Yin. "Research on Hole Expanding with Spiral-Fluted Electrode in ECM." Advanced Materials Research 102-104 (March 2010): 595–99. http://dx.doi.org/10.4028/www.scientific.net/amr.102-104.595.

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A manufacturing technology applying a special spiral-fluted electrode in traditional ECM (Electro-chemical Machining) is introduced, this method is provided with the advantages of both narrow-gap ECM and pulsed current ECM. It is a new technological method for expanding holes in hard metal materials parts. In this paper, a new type ECM electrode is proposed to solve hole expanding problem in carbide drill bush. The machining principles and the influence of some operating parameters of ECM on the machining precision and productivity are described. Experiments results indicate that the accuracy and quality of the machined surface and the machining efficiency could be improved greatly by applying spiral-fluted electrode in ECM. It is also showed that the inner surface of the carbide bush was finished easily by this method with the optimal operating parameters, at the same time, the surface roughness of a machined hole is improved to 1ess than 0.2m Ra, and the dimensional accuracy of hole can reach 0.02mm.

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Franz, Burkhard K. H., Graeme M. Clark, and David M. Bloom. "Surgical anatomy of the round window with special reference to cochlear implantation." Journal of Laryngology & Otology 101, no. 2 (February 1987): 97–102. http://dx.doi.org/10.1017/s0022215100101343.

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AbstractWhen the multi-channel cochlear implant electrode is inserted into the scala tympani through the round window the operation is best performed via a posterior tympanotomy. The view of the round window membrane, however, is incomplete because of its orientation and the fact that it has a conical shape. Nevertheless, a good view along the basal turn is obtained after the antero-inferior overhang of the round window niche and the crista fenestrae have been removed. It might be damaging to drill away the postero-superior overhang as the osseous spiral lamina lies extremely close to the round window membrane.

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Zhang, Weiwei, Huazhi Chen, Weikang Jiang, Rongkai Liu, and Shengyuan Jiang. "A Spiral Seal Method in the Lunar Regolith for Chang’E-5 Drill: Seal Design and Experiment." IEEE Access 7 (2019): 11378–86. http://dx.doi.org/10.1109/access.2019.2891954.

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Danilenko, B. D., and N. P. Malevskii. "Forming a helical chip-channel surface in a spiral drill by specifying two generative straight lines." Russian Engineering Research 29, no. 4 (April 2009): 397–99. http://dx.doi.org/10.3103/s1068798x09040157.

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Ghorbani, Siamak, Alejandro Veliz Aguayo Crisostomo, Vladimir Aleksandrovich Rogov, and Nikolay Ivanovich Polushin. "Experimental and theoretical research on drilling epoxy granite using coated and uncoated carbide spiral drill bits." International Journal of Mechanical Sciences 135 (January 2018): 240–52. http://dx.doi.org/10.1016/j.ijmecsci.2017.11.025.

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Шаронов, Иван, Ivan Sharonov, Владимир Курдюмов, Vladimir Kurdyumov, Вячеслав Прошкин, and Vyacheslav Proshkin. "RESULTS OF RESEARCH OF CYLINDER-SPIRAL SOIL-TILLING ROLLER." Vestnik of Kazan State Agrarian University 13, no. 4 (December 19, 2018): 135–39. http://dx.doi.org/10.12737/article_5c3de3ebef3823.45195118.

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The cylindrical soil tillage roller was developed. In the process of experimental studies of the proposed roller for assessing the quality of tillage from the standpoint of compliance with the soil density agrotechnical requirements adopted coefficient of compliance with the standard kse. As a result of experimental studies, the parameters and modes of operation of the roller have been optimized, at which the required quality of tillage is achieved. Analysis of the mathematical models obtained showed that, after rolling with a cylindrical spiral roller, kse = 0.98 (corresponding to soil density ρ = 1185 ... 1215 kg / m3), which fully satisfies the agrotechnically specified limit of soil density at a seed embedment depth - 1100 ... 1300 kg / m3. The maximum value of kse = 0.98 is achieved when the speed of the unit is v = 11 km per hour, the ballast mass is mb=100 kg, and the turn of the spiral is l=40 mm. It was revealed that after treatment with a cylindrical-spiral soil-cultivating roller, the coefficient of compliance with the standard was kse=0.98, which is significantly higher compared to serial rollers (0.83 - after rolling the SZ-5.4 drill and 0.91 after processing the ring spur roller). When assessing the field surface alignment, it was found that after treatment with a cylindrical-spiral roller, the coefficient of uniformity kv was 0.95, which is respectively 7.1% and 14.2% more compared to the areas treated with annular-heel rollers and annular rollers of the SZ seeder -5.4. In the course of field studies on the experimental field of Ulyanovsk State Agrarian University, it was found that the yield of spring barley after surface treatment of the soil with a cylindrical-spiral roller exceeded by an average of three years for 7.4% and 10.3%, respectively, the yield of this crop after rolling with a KKSh-6 roller and SZ-5,4 seeder wheels. The economic effect of the introduction of the proposed rink due to the increase in yield reaches 1,800 ... 2,460 rubles per 1 hectare of spring barley.

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Faur, Adrian Sorin, Marcel Sabin Popa, Bogdan Cornel Luca, Ioan-Doru Voina, and Dan Bizubac. "Research on the influence of a new tap drill geometry on C45, 42CrMo4 and X5CrNi8 steel processing." MATEC Web of Conferences 178 (2018): 01002. http://dx.doi.org/10.1051/matecconf/201817801002.

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The shearing of the chips in a blind hole thread presents a particular problem in machining industry. The tap geometry plays an important role in the tool's durability, influencing the forces during the tapping process and also the way in which the chips are evacuated. This paper analyzes the influence of the tap geometry on the cutting of materials such as C45, 42CrMo4 and X5CrNi8. An adequate geometry will extend the tap durability by controlling the chip when the tap reverses while still engaged in the tapping process. It relates to the improvement of a spiral tap drill, which discharges chips towards the shank via a helical flute. The article contains details about the tap geometries and the results obtained in this research. Based on the results obtained in this research, the purpose of this paper was achieved. The tap durability was improved, the chip deposition on the rake surface was reduced and the torsion torque has a smaller value compared to the standard tap geometry.

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Wu, Weizheng. "Research on drilling process technology and parameter optimization in soft coal seam." E3S Web of Conferences 271 (2021): 01004. http://dx.doi.org/10.1051/e3sconf/202127101004.

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Due to the low firmness coefficient of soft coal seam and the influence of formation pressure and in-situ stress, it is easy to cause hole collapse in bedding drilling, resulting in low hole forming rate and insufficient hole forming depth, so the drilling technology needs to be improved. This paper focuses on the study of hole forming technology and parameters of bedding drilling in soft coal seam. The research results show that: the key to improve the construction efficiency of bedding drilling in soft coal seam is to improve the slag removal ability of drilling engineering, and the drilling technology of spiral drilling and pressure air slag removal is conducive to improve the drilling depth and drilling effect. The hole forming process and parameters of spiral drilling and pressure air slag removal are systematically described. The drill pipe speed, the coal conveying capacity in the hole, the minimum wind speed of pressure air slag removal and the air supply pressure of slag removal are determined. It is of great practical significance to develop and improve the drilling technology of bedding hole drilling in soft coal seam to improve the gas drainage capacity of coal mine and the drilling depth and rate of bedding hole drilling in soft coal seam.

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Pivkin, Petr, Vladimir Grechishnikov, Artem Ershov, Vladimir Kuptsov, and Xiaohui Jiang. "Determination of Rational Design and Geometric Parameters of a High-Performance Drill Based on a Mathematical Model of the Cutting Part." EPJ Web of Conferences 248 (2021): 04011. http://dx.doi.org/10.1051/epjconf/202124804011.

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Processing of high-precision holes in one technological operation is an urgent problem of advanced manufacturing. Processing of precise holes in parts for aerospace and machine-building industries with a diameter of up to 30 mm is performed during countersinking, deployment or grinding operations. These operations are applied only if there already exists a pre-treated hole. Monolithic three-fluted drills have been becoming common for processing high-precision holes of 7-8 quality over the last few years. The processing of various types of materials such as stainless steels, cast iron and heat-resistant steels requires rational geometric and structural parameters of the cutting tool. The nature of the load distribution between all the teeth during drilling plays a huge role in the processing efficiency. Even load distribution between the three teeth and a positive geometry improves self-centering and reduces the deviation from the specified axis of the hole. The drill sharpening provides positive geometry along the entire main cutting edge. The influence of the geometric parameters of the cutting edge of the screw groove on the shape of the drill bit is equally important. Existing approaches to the design of the thinning do not account for the influence of the geometric parameters of the cutting edge on the section of the screw groove. Analytical approaches to modelling of the main cutting edges are typically married with difficulties associated with achieving a smooth change in the angle of inclination to the tangent of the cutting edge. The complexity of the aforementioned task is largely due to the presence of critical points at the interface of the spiral groove and thinning. Determining the rational shape of two sections of the main cutting edge performed in this study is a complicated task that includes several steps needed to find the number of nodal points. Achieving a positive rake angle in the normal section to the cutting edge at the gash area that was formed via a special sharpening is one of the most important results of this paper. The rational shape of the cutting edge and the front surface provides an increase in the strength of the cutting part by 1.3 times.

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Wang, Xiaobo, Feng Jiao, Dong Wang, and Ying Niu. "Development of a longitudinal–torsional ultrasonic vibration-aided drilling system for drilling carbon fiber-reinforced polymer materials." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 12 (February 24, 2019): 4176–86. http://dx.doi.org/10.1177/0954406219833084.

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This study aimed to explore the motion properties of longitudinal–torsional ultrasonic vibration-aided drilling, the feature of drilling dynamics, and an efficient path of implementing longitudinal–torsional component conversion. It also aimed to propose a spiral chute horn with high performance and low cost based on the propagation characteristics of ultrasonic waves. The finite element software ANSYS was used for modal analysis and the geometric parameters of helical flutes were achieved. The dynamics analysis of the longitudinal–torsional ultrasonic drilling system revealed that the ultrasonic vibration could improve the rigidity of the drill and that the components existed in longitudinal and torsional directions. Drilling the T300-12K/AG80 unidirectional carbon fiber-reinforced polymer using the longitudinal–torsional ultrasonic drilling system revealed that the results of theoretical analysis and numerical simulation were comparable. This drilling system could change the longitudinal–torsional ratio according to the geometrical parameters of the modal converter, improve the surface quality of the carbon fiber-reinforced polymer hole, and reduce the exit delamination.

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Li, Jianan, Heping Xie, Ling Chen, Cong Li, and Zhiqiang He. "Exploring Deep-Rock Mechanics through Mechanical Analysis of Hard-Rock In Situ Coring System." Advances in Civil Engineering 2020 (September 7, 2020): 1–11. http://dx.doi.org/10.1155/2020/8899156.

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Exploration of deep-rock mechanics has a significant influence on the techniques of mining and rock mechanics. Rock coring technique is the basic method for all rock mechanics study. With the increase of the drilling depth and increasing strength of the hard rock, how to obtain high-quality rock core through various coring techniques is an eternal work. Here an innovative method is applied to design the new coring system to maximize the efficiency of operation. The stress conditions or parameters of rock core in the coring are analyzed, and the mechanism of the core with in situ stress is shown in this paper. The conflict of the core and coring tool chamber is proposed for the innovative design. The innovative design method is fulfilled by the theory of inventive problem solving (TRIZ). An improved coring system for the full-length core with in situ stress was obtained with the solutions of improved coring mechanism, cutting mechanism, and spiral drill pipe.

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Vlase, Aurelian, Marius Iacob, Ovidiu Blăjină, and Vlad Darie. "Study Concerning the Cutting Tool Wear at Drilling of the Stainless Steel X20Cr13." Advanced Materials Research 1036 (October 2014): 230–34. http://dx.doi.org/10.4028/www.scientific.net/amr.1036.230.

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The researches in the cutting domain have as purpose the cutting process economic optimization. This paper studies the cutting tool wear at drilling of the stainless steel X20Cr13. The experimental data and their subsequent processing represent the original contribution of the authors to the estimation of polytropic exponents and to the assessment in terms of structure of the calculus relation of the cutting tool wear. The obtained relationship of the cutting tool wear on the tool putting surface at drilling of the steel X20Cr13 permits the determination of the wear on the putting surface, in the case of a couple: stainless steel X20Cr13 - Rp5 high-speed spiral drill, depending on the work parameters and the cutting conditions. Putting the condition of wear limitation, from the obtained relation, the cutting speeds are exactly given. The paper also contains graphs for the variation of the tool wear with parameters of the cutting technology. The results can be taken into consideration in the educational studies and in the theoretical technical research. They can be implemented in the manufacturing activity.

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Vlase, Aurelian, Marius Iacob, Ovidiu Blăjină, and Vlad Darie. "Analysis of the Relationship of the Cutting Tool Wear at Drilling of the Stainless Steel X15CrNiSi20-12." Applied Mechanics and Materials 657 (October 2014): 8–12. http://dx.doi.org/10.4028/www.scientific.net/amm.657.8.

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The researches in the cutting domain have as purpose the cutting process economic optimization. This paper studies the cutting tool wear at drilling of the stainless steel X15CrNiSi20-12. The experimental data and their subsequent processing represent the original contribution of the authors to the estimation of polytropic exponents and to the assessment in terms of structure of the calculus relation of the cutting tool wear. The obtained relationship of the cutting tool wear on the tool putting surface at drilling of the steel X15CrNiSi20-12 permits the determination of the wear on the putting surface, in the case of a couple: stainless steel X15CrNiSi20-12 - Rp5 high-speed spiral drill, depending on the work parameters and the cutting conditions. Putting the condition of wear limitation, from the obtained relation, the cutting speeds are exactly given. The paper also contains graphs for the variation of the tool wear with parameters of the cutting technology. The results can be taken into consideration in the educational studies and in the theoretical technical research. They can be implemented in the manufacturing activity.

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Riaz, Asim Ahmad, Riaz Muhammad, Naveed Ullah, Ghulam Hussain, Mohammed Alkahtani, and Waseem Akram. "Fuzzy Logic-Based Prediction of Drilling-Induced Temperatures at Varying Cutting Conditions along with Analysis of Chips Morphology and Burrs Formation." Metals 11, no. 2 (February 5, 2021): 277. http://dx.doi.org/10.3390/met11020277.

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Friction and plastic deformation at the tool–chips interaction during a dry drilling process results in temperature rise and promotes tool wear and surface roughness. In most of the components produced in industries, a drilling process is used to make a hole for final assembly. Therefore, knowledge of temperatures produced during drilling operation at various machining input parameters is required for the best quality product. A fuzzy logic-based algorithm is developed to predict the temperature generated in the drilling process of AISI 1018 mild steel. The algorithm used speed and feed rate of the drill bit as input parameters to the fuzzy domain. A set of rules was used in the fuzzy domain to predict maximum temperature produced in the drilling process. The developed algorithm is simulated for various input speed and feed rate parameters and was verified through the maximum temperature measured during drilling of the studied material at selected speed–feed combinations. Experiments were conducted to validate the results of developed fuzzy logic-based algorithm by using non-contact infrared pyrometer for drilling of AISI 1018 steel. A good agreement between the predicted and experimentally measured maximum temperature was observed with an error less than 6%. It is found that temperature increases with increase in cutting speed and feed rate. Size of roll back burr formation at the hole perimeter significantly increases with increase in drill speed and feed rate. Segmental continuity in spiral or helix chips morphology is more at low feed and high cutting speed. Chip radius increases with increase in feed rate and results in damaging of the machined surface and causes burr formation while the radius decreases with cutting speed along with improved hole surface finish.

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Supriyadi, Supriyadi, Ahmad Ridwan, and Yosef Cahyo. "STUDY PERENCANAAN PONDASI GEDUNG GUEST HOUSE 6 LANTAI DI KOTA KEDIRI." Jurnal Manajemen Teknologi & Teknik Sipil 3, no. 1 (June 30, 2020): 65. http://dx.doi.org/10.30737/jurmateks.v3i1.890.

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The building foundation is a lower structure that functions to carry the weight of the load to the subgrade. The foundation planning study in this study uses a bore pile type of foundation. This study uses the Meyerhoff method based on SPT data received by CV. Arya Duta. In this bore pile foundation planning, the carrying capacity of the bore pile foundation to the ground is 81.00 tons, with a depth of 26 M from the ground surface. The results of the calculation of pile drill piles get P 19.44 tons at the bottom of 26 M while the reinforcement of the pile cap is found in q 1.152 Ton / M (own weight). In the bore pile with spiral support found the results of the analysis data ((D. concrete 600 mm, Blanket 40 mm), (D reinforcement 16 mm, number of reinforcement 10), (D. stirrup 10 mm, Spacing 60 mm)). Based on the overall results of the structure, weight was found 16,771.43 Tons / M. Thus, from the analysis of equivalent lateral force loads (Fi 77.71), it was found that the construction of building structures is earthquake resistant.Pondasi merupakan struktur bawah bangunan yang berfungsi meneruskan berat suatu beban pada bangunan ke tanah dasar. Study perencanaan pondasi pada penelitian ini menggunakan pondasi tipe bore pile. Penelitian ini menggunakan metode Mayerhoff berdasarkan data SPT yang di terima oleh CV. Arya Duta. Pada perencanaan pondasi bore pile ini didapatkan kemampuan daya dukung pondasi bore pile terhadap tanah adalah sebesar 81.00 Ton, dengan kedalaman 26 M dari permukaan tanah. Hasil perhitungan tiang bor pile mendapatkan hasil P 19,44 Ton pada kedalaman 26 M. Sedangkan pada penulangan pile cap di temukan q 1,152 Ton/M (berat sendiri). Pada bore pile dengan tulangan spiral di temukan hasil data analisis ((D.beton 600 mm, Selimut 40 mm), (D tulangan 16 mm, jumlah tulangan 10), (D. sengkang 10 mm, Spasi 60 mm)). Berdasarkan hasil keseluruhan berat struktur ditemukan 16.771,43 Ton/M. Dengan demikian, dari analisis beban gaya lateral ekuivalen (Fi 77,71) didapatkan bahwa, Kontruksi struktur gedung tahan terhadap gempa.

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Pelikán, Lukáš, Michal Slaný, Libor Beránek, Vladislav Andronov, Martin Nečas, and Lenka Čepová. "Experimental Investigation of Suitable Cutting Conditions of Dry Drilling into High-Strength Structural Steel." Materials 14, no. 16 (August 5, 2021): 4381. http://dx.doi.org/10.3390/ma14164381.

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Dry machining is one of the main ways to reduce the environmental burden of the machining process and reduce the negative effect of the cutting fluid and aerosols on operators. In addition, dry machining can reduce overall machining costs and, in the case of large workpieces, reduce the extra work associated with removing residual cutting fluid from the workpiece and adjacent area. For high-strength structural steel products, it is typical to drill holes with larger diameters of around 20 mm. Therefore, this work is devoted to the investigation of the dry drilling process carried out on a workpiece made of S960QL steel with a helical drill with a diameter of 21 mm. The aim was to find suitable cutting conditions for dry drilling with regard to process stability and workpiece quality. An experiment performed with a coolant served as a comparison base. A dry drilling experiment was performed with cutting speeds from 30 to 70 m·min−1 and feeds from 0.1 to 0.3 mm·rev−1, and with the results of this experiment, the same experiment with flood cooling was performed. During the drilling process, spindle torque values were recorded using the indirect spindle current recording method. The macroscopic chip morphology was studied to understand the cutting process. The chip thickness ratio was measured, as well as the maximum diameter of spiral chips. On the final workpiece, the qualitative and dimensional parameters of the holes were evaluated, such as the diameter, cylindricity and surface roughness, depending on the change in the cutting conditions and cutting environment. Evaluation of the obtained data led to the following conclusions. When drilling the S960QL material, there is only a very small increase in the drilling torque during dry drilling compared to drilling with cutting fluid. The increase in friction demonstrated by the chip thickness coefficient is significant. The influence of the environment on the dimensional accuracy showed a tendency for a slight increase in the holes’ diameters during dry machining. In comparison, the cylindricity of the dry-drilled holes shows a lower deviation than the holes drilled with cutting fluid. The surface roughness of the holes after dry drilling is affected by the increased friction of the outgoing chips, despite the resulting parameters being very good due to the drilling technology standards. This work provides a comprehensive view of the dry drilling process under defined conditions, and the results represent suitable cutting conditions to achieve a stable cutting process and a suitable quality of drilled holes.

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Vasil’ev, E. V., D. S. Makashin, and I. K. Chernykh. "INFLUENCE OF FORMS AND GEOMETRIC PARAMETERS OF THE SUBSTRATE OF THE TRANSVERSE CUTTING EDGE ON THE THICKNESS OF THE SIZE BY THE LENGTH OF THE CUTTING EDGES OF THE SPIRAL DRILL." Dynamics of Systems, Mechanisms and Machines 6, no. 1 (2018): 154–62. http://dx.doi.org/10.25206/2310-9793-2018-6-1-154-162.

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Turmanidze, Raul, and Zviad M. Gviniashvili. "Fine-Sized Spiral Drills with Variable Inclination Angle of Chip Grooves - Design and Manufacture." Key Engineering Materials 496 (December 2011): 253–58. http://dx.doi.org/10.4028/www.scientific.net/kem.496.253.

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In the submitted work the analysis of influence of a setting angle of chip grooves on the strength and durability of fine-sized spiral drills and the basing of utilization effectiveness of spiral drills with variable angle in comparison with standard drills are shown. The resistance to wear tests results and plan of subsequent studies are discussed.

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Journal articles on the topic 'Drill spiral'

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