Kliknij ten link, aby zobaczyć inne rodzaje publikacji na ten temat: Magnetic abrasive.
Rozprawy doktorskie na temat „Magnetic abrasive”
Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych
Sprawdź 32 najlepszych rozpraw doktorskich naukowych na temat „Magnetic abrasive”.
Przycisk „Dodaj do bibliografii” jest dostępny obok każdej pracy w bibliografii. Użyj go – a my automatycznie utworzymy odniesienie bibliograficzne do wybranej pracy w stylu cytowania, którego potrzebujesz: APA, MLA, Harvard, Chicago, Vancouver itp.
Możesz również pobrać pełny tekst publikacji naukowej w formacie „.pdf” i przeczytać adnotację do pracy online, jeśli odpowiednie parametry są dostępne w metadanych.
Przeglądaj rozprawy doktorskie z różnych dziedzin i twórz odpowiednie bibliografie.
1
森, 敏彦, Toshihiko MORI, 健治 広田, Kenji HIROTA, 進幸 千田, Shinkoh SENDA, 義人 川嶋 i Yoshihito KAWASHIMA. "磁気研磨機構に関する力学的考察". 日本機械学会, 2002. http://hdl.handle.net/2237/9029.
Pełny tekst źródła
2
Іщик, Дмитро Володимирович. "Підвищення якості свердел із швидкорізальної сталі при магнітно-абразивному обробленні". Master's thesis, Київ, 2018. https://ela.kpi.ua/handle/123456789/26703.
Pełny tekst źródłaStreszczenie:
Дисертація на здобуття наукового ступеня магістра за спеціальністю 133 – Галузеве машинобудування. – Національний технічний університет України "Київський політехнічний інститут імені Ігоря Сікорського". – Київ, 2018.
Проаналізувавши сучасні методи покращення якості та продуктивності різальної кромки металорізального інструменту, на прикладі свердел, було обрано метод магнітно-абразивного оброблення. Даний метод дозволив досягти значного покращення якості різальної кромки (шорсткості), збільшення значення твердості поверхневого шару і відповідно – періоду стійкості свердла.
В дисертації проаналізовано шляхи вирішення проблеми стійкості інструменту при роботі, досліджено процес МАО шляхом проведення експлуатаційних випробувань свердел, оброблених цим методом. Магнітно-абразивні порошки було підібрано зважаючи на поперед ні роботи в цій галузі, а саме – використали порошки великих фракцій. Результати досліджень підтвердили доцільність їх використання наряду з порошками малих фракцій. Експериментальні дані використані та впроваджені на підприємстві ДП «Київський бронетанковий завод».Dissertation for a Master's degree in specialty 133 – Branch mechanical - engineering. - National Technical University of Ukraine "Kyiv Polytechnic Institute named after Igor Sikorsky". - Kyiv, 2018. Having analyzed the modern methods of improving the quality and productivity of the cutting edge of the metal cutting tool, on the example of the drill, the method of magnetic abrasive treatment was chosen. This method has allowed to achieve a significant improvement in the quality of the cutting edge (roughness), an increase in the hardness of the surface layer and, respectively, the period of drill firmness. In the dissertation the ways of solving the problem of instrument stability during work are analyzed, the process of MAO is investigated by carrying out operational tests of the drills processed by this method. Magnetically-abrasive powders were selected in the light of previous work in this field, namely, the use of powders of large fractions. The results of the studies confirmed the feasibility of their use, along with small fractions powders. Experimental data were used and implemented at the enterprise "Kyiv Armored Plant".
3
Джулій, Д. Ю., В. С. Майборода i T. Emmer. "Формування радіусу округлення різальних кромок зубонарізних зубків при магнітно-абразивному обробленні". Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/38109.
Pełny tekst źródłaStreszczenie:
Магнітно-абразивне оброблення (МАО), як метод фінішного оброблення твердосплавного різального інструменту має ряд переваг в порівнянні з іншими, оскільки він забезпечує комплексний вплив на фізико-механічні властивості поверхневих шарів та забезпечує формування необхідної мікрогеометрії робочих поверхонь, радіусів округлення та форми різальних кромок (РК).
4
Ткачук, І. В., i В. С. Майборода. "Формування магнітно-абразивного інструменту на установках з кільцевим розташуванням робочої зони". Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/38153.
Pełny tekst źródłaStreszczenie:
Забезпечення прогнозованого процесу магнітно-абразивного оброблення (МАО) на установках з кільцевим розташуванням робочої зони не можливе без вичерпної інформації про особливості формування магнітно-абразивного порошку (МАП) в магнітно-абразивний інструмент (МАІ). В процесі МАО МАІ взаємодіє з оброблюваними поверхнями не окремими зернами МАП, а їх групами, які представляють собою конусоподібні стовпчики, розташовані своїми основами на поверхні полюсних наконечників та веретеноподібні формування, які розташовуються в середній частині робочого зазору забезпечуючи формування практично суцільного порошкового інструменту, у якого віртуальною зв’язкою є магнітне поле.
5
Chang, Geeng-Wei, i 張耿維. "Study on finishing characteristics of magnetic abrasive finishing and electrolytic magnetic abrasive finishing". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/84632633599821840030.
Pełny tekst źródłaStreszczenie:
博士國立中央大學
機械工程研究所
92
Abstract Magnetic abrasive finishing (MAF) is a precise polishing method that the cutting tool is a group of magnetic abrasives, which the abrasion pressure is controlled by a magnetic filed. A limited amount of material will be removed by conducting a relative motion between the work surface and the abrasives, so as to obtain a mirrorlike finished surface. Owing to the magnetic field, the magnetic abrasives will gather to form a flexible magnetic brush. Thus the magnetic abrasives can move and polish along the profile of a complex surface, so the surface with complex shapes can be finished. Furthermore, the disturbances from the structure due to vibration or chatter will not affect the quality of the finished surface. The unbonded magnetic abrasive (UMA) used in this study is a mechanical mixture of ferromagnetic particles and abrasives. The finishing characteristics of UMA in cylindrical MAF are investigated, and then an application on improving the electrical discharge machined surfaces is performed. Experimental results demonstrate that the finishing characteristics of UMA are as good as those of sintered magnetic abrasives, which is much more expensive than UMA. The surface roughness of the SKD11 workpiece with HRC55 hardness can be improved from 0.25mm Ra to 0.042mm Ra after a few minutes of finishing. An improved MAF, which transfers the abrasion pressure to the abrasives through a sheet of unwoven cloth, can further improve the surface roughness of the workpiece to a level of 0.017mm Ra. Concerning the peripheral electrical discharge machined surfaces, MAF can remove the recast layer and the micro cracks easily, and a refined surface of 0.04mm Ra will be obtained. To elevate the finishing performance, an electrolytic magnetic abrasive finishing (EMAF), which is a compound polishing process by involving the traditional MAF and electrolysis, is developed. The passive film, whose hardness is lower than that of the original metal surface, is produced on the work surface, and is then removed by MAF during processing of EMAF. The finishing characteristics of EMAF are investigated, and then the results are compared with those of MAF concerning the cylindrical finishing of the SKD11 workpiece and the internal finishing of a circular pipe with AISI 304 stainless steel. Experimental results show that the finishing characteristics of EMAF are better than that of MAF. Despite what kind of surface is finished, EMAF yields a better surface roughness and higher material removal than MAF did. Especially in the case of the cylindrical finishing of SKD11, a mirrorlike finished surface of 0.017mm Ra can be produced from 0.178mm Ra after 5 minutes of finishing using EMAF. This study describes the principles of the process of MAF and EMAF, the finishing characteristics of surface roughness and material removal, and the associated mechanisms. Additionally, the theory, that the path of the electrolytic ions toward the anode surface is changed into a cycloid curve under the effect of the Lorentz force, and the forms of the passive film that is produced on the work surface in EMAF, are also described in detail. Some experiments on the only electrolytic process without MAF are performed to analyze the synergistic effect between MAF and electrolysis. Experimental results show that EMAF will produce rather large amount of extra material removal under proper process conditions due to the synergism of them. To determine the optimum process conditions for improving the surface finish and increasing the material removal in cylindrical EMAF, experiments using the Taguchi method and L18 orthogonal array are performed. Further, the significances of the control factors are identified with the assistance of analysis of variance (ANOVA).
6
Huang, Wen-Ke, i 黃文科. "Study of Magnetic Abrasive Polishing". Thesis, 2001. http://ndltd.ncl.edu.tw/handle/56888999908321793984.
Pełny tekst źródłaStreszczenie:
碩士國立雲林科技大學
機械工程系碩士班
89
Some stainless steel tube and aluminum alloy tube have many small holes, which are so slender that a conventional grinding tool is hardly inserted into the tube deeply, being impossible to machine down. A new high-efficiency technology of polishing method is created name magnetic abrasive polishing in which the suitable concentrative magnetic flux is performed in the inner working region of tube by N-S magnetic poles set in the outer side so that magnetic force as machining pressure acts upon magnetic abrasive particles to the internal surface. It is finishing performance using magnetic abrasives made of both iron and alumna. The iron particles generate finishing pressure by the magnetic field and magnetic abrasive also have a finishing effect on the inner surface of tubing. Magnetic abrasive finishing process is thought as one of possible methods for the automation of 3D mold surface finish in which is modified for applying to 2D free form surface and 3D curved surface. Magnetic abrasive polishing is used simple equipment and a few of workers and the possibility of precision edge finishing is confirmed. In the experiments showed that a work piece is finished smoothly 5 minutes from the un-machined surface roughness value of about Rmax 1.2μm to the machined value of Rmax 0.25μm
7
Denni i 詹凱翔. "Development of the Gel Magnetic Abrasive Finishing". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/82113683441092712283.
Pełny tekst źródłaStreszczenie:
碩士清雲科技大學
機械工程研究所
94
This research mainly had employed the gel magnetic abrasive finishing for grinding the surface of the mold steel. A magnetic abrasive cutting tool installed in the CNC machine was used to attract the magnetic abrasive gel. A flexible magnetic brush was produced when the magnetic field was applied in the gel. The surface roughness of the working pieces would be improved by this finishing method. In the experiment, the factors of the rotating speed, the abrasive size, the iron particle size, the abrasive concentration, and the grinding amount were used to improve the machining rate of the gel magnetic abrasive finishing. Based on the above research, the Taguchi method was adopted to find optimum parameters from the experiment. The roughness improved rate would reach to 92% after a 30 minute machining and the surface roughness of the working pieces would reduce to 0.083μm.
8
Cheng, Tsung-Jen, i 鄭棕仁. "Study of magnetic abrasive finishing combined with electrolytic process". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/59943677654032836344.
Pełny tekst źródła
9
Lin, Ching-Tien, i 林清田. "Characteristic study in magnetic abrasive finishing of SUS304 material". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/41104662028534644980.
Pełny tekst źródłaStreszczenie:
碩士國立中興大學
機械工程學系
92
Abstract This research mainly employed the magnetic abrasive finishing method to process the stainless SUS304 material in face abrasive operations. The operations were demonstrated in the permanent magnetic field and the electrical magnetic polishing mechanism, it was installed in the CNC machining center. The operations were conducted using Taguchi experimental design, the effects among the parameters such as magnetic field, revolution, feed rate, gap, abrasive, and coolant, were considered. The experimental data was collected by way of the Taguchi experimental design and the data were analyzed statistically, the ANOVA was shown the effect of the process parameters. The confirmation experiments showed the optimal operational condition of surface roughness and material removal quantity. The collected data were analyzed using statistical software in order to establish a nonlinear regression model of abrasive magnetic process parameter and quality characteristic. The optimal parameter condition in processing the stainless SUS304 material was conducted using two stage processes; the first stage was rough cutting in the material and then finished cutting the material. Prior to the rough cutting, the Rmax value is equal to 2.572 um, after the rough cutting the Rmax value is equal to 0.153 um. The finished cutting can even obtain a more precious Rmax value being equal to 0.100 um which is like mirror surface. It can be proved that magnetic abrasive finishing is one of the highest efficiency and precision technologies.
10
Chiang, Sheng-Han, i 江昇翰. "The characteristics of Magnetic Abrasive Finishing and Sensitivity Analysis". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/32750983682428230157.
Pełny tekst źródłaStreszczenie:
碩士修平科技大學
精密機械與製造科技研究所
99
Magnetic abrasive finishing is process of abrasive machining conditions, by using magnetic field energy and abrasives on different such as spindle speed, feed rate, abrasive size and the gap between tool and workpiece etc. Magnetic abrasive finishing can effectively remove burrs and increase surface finish, especially suited for the inner hole and groove. Magnetic abrasive finishing not only provides workpiece with high machining accuracy and minimal surface damage, but also has the advantages of mass production and speed. This paper integrates machine center cutting process and magnetic abrasive finishing (MAF) producing a combined process that improves the magnetic abrasive loss rate (MALR) and surface roughness (SR) of aluminum alloy 6061-T6 with ladder shape of different height. The present study shows the features of the development with mathematical model based on response surface methodology (RSM) for correlating the interactive and second order influences of major machining parameters such as different size and shape abrasive of stainless, spindle speed, tool and workpiece gap, feed speed, respectively. The experiments design, regression analysis and analysis of variance are used to develop the relationships between process parameters (abrasive size, spindle speed, tool and workpiece gap, feed speed) and responses (MALR and SR) in MAF process. Sensitivity analysis has also been carried out using developed empirical equations. The results shows that developed mathematical models can be applied to estimate the effectiveness of process parameters for MALR and SR with a change of spindle speed affects the MALR more strongly than SR relatively compare to other parameters.
11
Mishra, Aviral. "Modelling, simulation and optimization of ultrasonic assisted magnetic abrasive finishing process". Thesis, 2018. http://localhost:8080/xmlui/handle/12345678/7565.
Pełny tekst źródła
12
Lee, Sheng-Cheng, i 李勝正. "The Study of the Mechanism for Gel Magnetic Abrasive Finishing". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/28603849371677161025.
Pełny tekst źródłaStreszczenie:
碩士清雲科技大學
機械工程系所
97
Silicone gels mixing with steel grits and silicone carbons were abrasive media with permeance to obtain excellent polishing efficiency in the magnetic finishing with gel abrasive (MFGA). These abrasive media were not only easily produced but also recycled after machining, reducing the cost in MFGA; silicone gel play an important role in this study. However, there were no researches to discuss the mechanism in MFGA, decreasing the practicability in the magnetic finishing field. Therefore, different silicone gels were used to locate the abrasion behavior in this study and established mechanism of MFGA. Polishing efficiencies with or without silicone gels were identified to finish the cylindrical rod first in our study. In addition, Silicone gels are temperature dependent materials, so temperature in the working area was then to verify the relation between the circulation and efficiency. Moreover, concentrations were one of the important factors affecting the circulation of the abrasive media in the machining area; hence concentrations of silicone gels with different plasticity were to recognize the circulation of abrasive media in MFGA. Results showed that temperature of the abrasive media with low plasticity would exceed to 100oC in the working area and excellent circulation could find in the side of the abrasive media. Furthermore, Surface roughness of workpiece markedly reduced from 0.651 to 0.025μm Ra within 30 minutes. Regardless of silicone gels, fine circulating effects of abrasive media were effortlessly obtained in the working area when the abrasive media with low concentrations were used as bonding gel; additionally, surface roughness was easily reduced to 0.030μm Ra during the fine circulation.of the abrasive media. However, good polishing efficiency could locate in the high concentration of abrasive media if silicone gel with low plasticity was used as abrasive medium.
13
Lien, Chun-Yen, i 連俊彥. "A study of precision ball screw in Magnetic abrasive Finishing". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/91470875941012239524.
Pełny tekst źródłaStreszczenie:
碩士清雲科技大學
機械工程所
100
The finishing of ball screw in the market is mostly by procedures of coarse, fine and precision grinding. However, these finishing methods must undergo two processes thus they require longer time. Magnetic abrasive finishing is a fast and high precision approach, but the magnetism of magnetic abrasive is reduced when finishing ball screw, and because the centrifugal force generated tends to throw abrasive away from the processing area, the stability of finishing is thus decreased. This study mainly focuses on the effect of the magnetic gel abrasives in stainless steel pipe on the finishing efficiency of ball screw. We developed different gels as binders and restrained magnetic and hard abrasive grains in the gels to form magnetic gel abrasives. Since the gel abrasives are viscous, they can not only wrap around the abrasive grains to prevent from spreading, but also attach tightly onto the surface of ball screw. We placed the magnetic gel abrasives in stainless steel pipes to conduct finishing on ball screws, and collocated different processing parameters based on different gel viscosity to investigate the changes in surface roughness and material removal rate. The Taguchi method was applied for establishing optimal parameters for magnetic gel abrasive finishing. In order to reduce the number of experiments performed, ANSYS was used for analyzing the optimal magnetic distribution of magnetic poles, and a magnetic pole shape suitable for ball screw finishing was designed. The results showed that after 30min of ball screw finishing using aqueous slime gel with lower viscosity, the surface roughness can be decreased from 0.368μm Ra to 0.061μm Ra, and the material removal rate can be as high as 31.1mg. This proves that the magnetic gel abrasive finishing developed in this study has outstanding finishing effect on ball screws.
14
CHIU, CHENG-YAO, i 邱正耀. "A Study of the Magnetic Abrasive Finishing with Rolling Cylinder". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/e2s368.
Pełny tekst źródłaStreszczenie:
碩士健行科技大學
機械工程系碩士班
106
Magnetic abrasive finishing (MAF) is a high-precision polishing method using the magnetic force to restrict the abrasive gels. However, the magnetic force of abrasive particles will drop when polishing non-conductive material such as SUS304 stainless steel tube. Moreover, the abrasive particles will be moved off the surface of machining area due to the centrifugal force of rotation, and reduce the stability of polishing. Therefore, this study developed a drum-type magnetic polishing machine to allow the abrasive particles performed tumbling and rotating motions, such as in a drum-type washing machine. Beside, the manual wheel was adopted to change the horizontal inclination of the machine to compare the polishing efficiency of different processing angles. Moreover, the processing of rotating objects for the drum, powerful magnets and workpieces, a homemade fixture to binding the abrasive and fixed, so that the process of relative motion. The experimental process will be matched with different processing parameters to explore the surface roughness and material removal changes. The experimental results show that the application of drum-type magnetic polishing machine to polish SUS304 stainless steel after 5 minutes, the value of surface roughness can be reduced from 0.2878 μm Ra to 0.0710 μm Ra. Relatively, the value of surface roughness only reduced from 0.26 μm Ra to 0.18 μm Ra regarding a traditional reciprocating magnetic polishing machine. Finally, the results indicate that the processing efficiency of a drum-type magnetic polishing machine about 2.7 times than the traditional magnetic polishing machine. It is confirmed the development of the drum-type magnetic polishing machine and its fixture has a very excellent polishing effect to polish non-conductive material such as SUS304 stainless steel tube.
15
Song, Sin-Yun, i 宋欣芸. "Studies of Magnetic Abrasive Finishing on the Aluminum Cylindrical Surface". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/2y8aad.
Pełny tekst źródłaStreszczenie:
碩士國立中山大學
機械與機電工程學系研究所
107
This study designs a magnetic abrasive finishing device with a one-sided magnetic pole module, and iron powders adsorbed by the magnetic pole are arranged into a horizontal magnetic brush along with the magnetic lines of force. The 6061 aluminum alloy is finished using this module. Under the static and dynamic conditions, the effects of the magnetic brush forming method, the amount of iron powder and the load on the contact area between the iron powder and the workpiece is discussed. In addition, the effects of dry and wet magnetic brushes (aqueous cutting fluid or kerosene), and circulating cutting fluid mixed alumina abrasive grains (fixed-point or reciprocating finishing) on the surface roughness of aluminum alloy workpieces are investigated. The surface of the aluminum alloy workpiece and the magnetic brush are observed using an optical microscope to choose the most suitable method for magnetically grinding the aluminum alloy. In the static experiments, when the magnetic brush is naturally formed, the contact area increases with increasing load. When the magnetic brush is pre-shaped, the contact area achieves a constant value and independent of the load. In the dynamic experiments, when the magnetic brush is pre-shaped, the contact area increases along with the amount of iron powder and load. In the finishing experiments using the dry magnetic brush, when the load is small, the less the iron particles are embedded on the surface of the workpiece. In addition, regardless of whether the wet magnetic brush is an aqueous cutting fluid or kerosene, the adhesion wear can be observed on the surface of the workpiece after finishing, and aluminum scrap is embedded on the magnetic brush. In the fixed-point finishing experiments using circulating cutting fluid mixed alumina abrasive grains, iron particles were embedded on the surface of the workpiece at a finishing time of 5 minutes, and the surface of the magnetic brush was filled with aluminum chips. In the reciprocating finishing experiments using a fluid containing 1 μm alumina abrasive with a load of 0.1 N, the surface roughness of the aluminum alloy workpiece decreases from Ra = 0.197 μm, Rmax = 1.603 μm to Ra = 0.089 μm, and Rmax = 0.947 μm at a finishing time of 8 minutes.
16
Shukla, Vipin Chandra. "Experimental investigations and analysis of ultrasonic assisted magnetic abrasive finishing process with bonded abrasives and efficaciously designed electromagnet". Thesis, 2017. http://localhost:8080/iit/handle/2074/7529.
Pełny tekst źródła
17
CHO, KEN-I., i 卓耕毅. "Study on Magnetic Grinding of SUS304 Stainless Steel by Different Abrasive". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/89m48z.
Pełny tekst źródłaStreszczenie:
碩士東南科技大學
機械工程研究所
105
In this paper, the surface defects and surface roughness of SUS304 stainless steel after undergoing processing are studied through vibration-assisted magnetic grinding and polishing parameters. In the experiment, the surface of SUS304 stainless steel was ground and polished with the parameter setting of polishing liquids of different concentrations, different magnetic pole rotation speeds, different vibration platform rotation speeds, different grit weights and numbers, and different silicon carbide and boron carbide particle sizes to discuss the surface roughness and observe the surface morphology of the test piece after grinding and polishing. According to the experimental results, with 1 g of boron carbide powder having a particle diameter of 0.7 µm, 4 g of grit with a grit number of #120, 3 g of grinding liquid, a magnetic pole rotation speed of 550 rpm and a platform rotation speed of 1500 rpm, the roughness of the SUS304 stainles steel can be lowered from 0.19μm to 0.024μm in 15 minutes, and the improvement rate is 87.37%. Could effectively remove markings in the surface of SUS304 stainless steel, and the surface cracks and knife marks of the test piece were significantly reduced. The experimental results show that the best parameters have a better improvement effect on the surface.
18
Zheng, Zhen-Yao, i 鄭振瑤. "A Study of Vacuum Sintering Magnetic Abrasive of Material Fe- Al2O3". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/43207810542098382175.
Pełny tekst źródłaStreszczenie:
碩士中興大學
機械工程學系所
94
The role of magnetic abrasives in Magnetic Abrasive Finishing corresponds to that of the tools used in Machine Tool, which makes magnetic abrasive an important factor during the process of Magnetic Abrasive Finishing. Magnetic abrasives are composite abrasives which must be magnetizable and abrasive. Substances with fine magnetization include Fe, Co, nickel, etc.; varieties of abrasive are Al2O3, SiC, BN, B4C, Diamond Powder and so on. However, the high-priced equipment and special expertise for the making process of magnetic abrasive make the price of import magnetic abrasive stay high. In order to discuss the surface roughness and material removal weight on the application of stainless steel SUS304 through sintered magnetic abrasive, the study adopts Vacuum Sintering Technology to produce the magnetic abrasives with the combination of Fe and Al2O3, along with the Taguchi Experimental Design for carrying out the sintering experiment so that we could obtain the best parameter of Fe particle, Al2O3 particle, element proportion, pressure (MPa), PVA, temperature and heating time. And finally we analyze the magnetic abrasives by SEM with EDS. The result shows that the self-developed magnetic abrasives through exactly finishing testified can finish the surface of stainless steel SUS304 to Ra 0.018μm. It is good enough to compete with the magnetic abrasives imported from Japan. The study is to use Vacuum Sintering Technology to develop the magnetic abrasives with higher quality, better wearing resistance , and lower price, that is, the development of magnetic abrasives and the obtainment of the best parameter. The application of successfully developed magnetic abrasives on surface, inside and outside diameter, curve pipe, spiral pipe parts of stainless steel may lead the magnetic abrasive skills of our country to a brand new state.
19
Chen, Wei-Ta, i 陳韋達. "Study The Effect of Plane Polishing in Gel Magnetic Abrasive Finishing". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/36498653233891126151.
Pełny tekst źródłaStreszczenie:
碩士清雲科技大學
機械工程研究所
95
This research is mainly to probe into gel magnetic abrasive finishing and grind and throw the efficiency processed to compare and assess to the level. Regard SKD-11 as the experiment to try slice, grind and process the level. Cooperate with the magnetic NC handle of a knife made by oneself installation is on the processing machine main shaft of CNC. Lead magnetic high polymer colloid abrasive absorb on handle of a knife, NC of magnetic, processing ending. Magnetic force line and function, high polymer of colloid, make grit constrained offering the characteristic that the flexibility is processed. Use Taguchi Method Overview and Single gene experience, to probe into the magnetic force of the colloid and grind the processing efficiency ground to the level. Process the parameter in rotational speed that by the main shaft, entering to the speed, processing a foot-path of route, route interval, magnetic force distance, magnet kind, abrasive and hardness of colloid. The roughness of surface is improved after observing and trying a slice of processing, for grinding the influence of throwing efficiency with every processing factor. Through Taguchi Method Overview experimental result, surface roughness improving rate can be up to 88% after processing one minute. The experimental result of Single gene experience, can know the roughness of surface is reduced from 0.26 to 0.018 finally, so the improving rate of roughness of surface can be up to 93%. So there is excellent grinding the efficiency of leaving behind to prove the effect of plane polishing in gel magnetic.
20
Mulik, Rahul S. "Experimental investigations and analysis of ultrasonic assisted magnetic abrasive finishing process". Thesis, 2011. http://localhost:8080/iit/handle/2074/5263.
Pełny tekst źródła
21
Uplaonkar, Anand. "Experimental investigation of unbonded magnetic abrasive polishing (UMAP) of silicon nitride balls". 2005. http://digital.library.okstate.edu/etd/umi-okstate-1645.pdf.
Pełny tekst źródła
22
Chang, Wei-Bo, i 張煒柏. "Study The Effect of Precision Ceramic in The Magnetic Gel Abrasive Finishing". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/68151093727782143015.
Pełny tekst źródłaStreszczenie:
碩士清雲科技大學
機械工程研究所
96
For the hard and brittle properties of the precision ceramic, a gel abrasive with ferromagnet was developed to polish this product. Silicone gel was chose as the medium that used to mix the ferromagnet and abrasive in this study, and a magnetic tool was designed to adsorb and fix the ferromagnetic gel abrasive in the gel magnetic abrasive finishing (GMAF). In this experiment, Taguchi method was first applied to find the optimal parameters in GMAF, surface roughness of the workpiece was evaluated by this method. Then the polishing efficiency was discussed by the abrasive mesh and the gap between the gel abrasive and workpiece. The results shown that the abrasive mesh, the distance between two polishing path, the feed rate of Z axis and the machining path of numerical control were four important factors that would dominate the surface roughness of the workpiece. The surface could be finished from 0.316 mRa roughness to 0.089mRa roughness during 30 minutes; the roughness improvement rate of this process would reach 72%. Therefore, the excellent polishing ability of the GMAF has been improved in this study.
23
Chieh, I.-Hung, i 偕義弘. "Study of internal surface by magnetic abrasive finishing combined with electrolytic process". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/37819864868674425759.
Pełny tekst źródła
24
Chuang, Cheng-Ru, i 莊政儒. "The Internal Finishing of Rectangular Tubes by Applying Magnetic Abrasive Machining Method". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/04486525467760655589.
Pełny tekst źródłaStreszczenie:
碩士華梵大學
機電工程研究所
90
A new internal magnetic-abrasive machining process of the 6061-T6 aluminum alloy rectangular tube is developed and investigated. In this study, a new finishing apparatus and auxiliary fixtures are designed and developed to simulate the internal finishing process, the magnetic abrasive particle that the finishing ability abrasive grains (Al2O3) are sintered with a ferromagnetic substance (iron powder) by hot pressed, and, the working parameters and their finishing performances are investigated and reported. The Taguchi-Method is adopted for the experimental plan, magnetic field strength, quantity of magnetic abrasives, particle size of magnetic abrasives, rotating speed of magnetic pole, feed rate, vibration frequency, vibration amplitude and the coolant are to be used as the control parameters, internal surface finishing performances, such as the stock removal, the polishing efficiency, and the surface roughness, are studied and verified experimentally. In the present case, by applying the optimal working conditions, a 19.33mg stock removing and 1.91mg/min optimal polishing efficiency were found, and the surface roughness was improved from Ra 0.52mm、Rz(DIN) 2.8mm to Ra 0.09mm、Rz(DIN) 0.66mm. In this paper, the effects of some major parameters on the surface finishing performances are also clarified experimentally.
25
Wu, Peng-Yu, i 吳芃豫. "Studies on the Action Mechanism of Flexible Brush Using Magnetic Abrasive Finishing". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/ymrr3a.
Pełny tekst źródłaStreszczenie:
碩士國立中山大學
機械與機電工程學系研究所
107
In order to observe the structure and mechanism of the flexible magnetic abrasive brush (FMAB), this research uses a self-developed observation device of flexible magnetic brush. The experiments are divided into two parts: the workpiece is stationary or rotating. FMAB is formed by iron particles with a particle size of 40-62 μm. The effects of load (0.25 ~ 10 N), iron particle weight (0.1 ~ 0.5 g), magnetic brush forming method (natural forming, fixture forming, preload forming), dry or wet magnetic brush (adding alumina abrasive and kerosene) on the porosity, the height, the contact area of magnetic brush, and the friction coefficient are investigated. When the workpiece is stationary, the iron particles in natural forming FMAB is not completely arranged according to the direction of the magnetic line; Fixture forming FMAB is relatively uniform; Preload forming FMAB is the most compact. The change process of the magnetic brush by the load is sequentially deformed by the tip, and then broken and rearranged into a short and dense magnetic brush. On the other hand, the porosity of the FMAB gradually decreases to a saturation value as the load increases. At light load, the porosity of the preload forming FMAB is smaller than that of the natural forming and fixture forming FMAB. When the workpiece is rotating, the contact area between FMAB and workpiece rises sharply, and the height of FMAB drops sharply at load less than 1 N, but they tend to be gentle at load higher than 1 N. In addition, under light load, the contact area of the preload forming FMAB is larger than that of fixture forming FMAB, and the magnetic brush height is also lower; under heavy load, all FMAB heights are close to 0.6 mm, and the contact area are close to 115 mm2. On the other hand, the friction coefficient of the preload forming FMAB under light load is 0.4, which is higher than the other two FMABs (0.2). The friction coefficient under heavy load is 0.2. When alumina abrasives are added into the iron powders, the alumina abrasive exists in the gap between the magnetic brushes in the form of agglomerates under light load. As the load increases, the magnetic brush gap becomes smaller, and the alumina abrasive agglomerates are also dispersed between the iron particles. In addition, the friction coefficient increases from 0.2 to 0.23 as alumina abrasives are added into the iron powders. On the other hand, the FMAB composed of iron powder and kerosene has the lowest friction coefficient (0.15). The FMAB composed of iron powder, kerosene and alumina abrasive has the highest friction coefficient (0.25).
26
YE, Yun-Yun, i 葉雲霆. "Study of the Effect on Curved Surface Using Magnetic Finishing with Gel Abrasive". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/09283846785664991888.
Pełny tekst źródłaStreszczenie:
碩士健行科技大學
機械工程系碩士班
102
In the last several decades, there has been a rapid growth of mold and die industry due to the development of the manufacturing industry. But the traditional polishing is only restricted to plane polishing, which is unable to have the good polishing effect on the curved surface. In recent years, curved-surface-polishing technology in market has gathered great importance and fast development. This research is mainly to probe into the gel magnetic abrasive mixed with steel grit and silicone carbon as the abrasive media to obtain excellent polishing efficiency in the magnetic finishing with gel abrasive; not only are these abrasive media easily produced but also can reduce the cost. In this research, firstly the CNC milling machine was utilized to conduct the single-factor experiments on the curved surface of tool steels with a view to ascertaining the effects on the polishing efficiency of such working parameters as types of magnet, feeding rates, rotational speed, amounts of silicone carbon, mesh no. of silicone carbon, amounts of steel grit, and mesh no. of steel grit; then the Taguchi experimental method was employed to determine the optimal combination of working parameters and the contributions of individual factors to the polishing efficiency; and finally, by the use of optimal combination of working parameters, the polishing efficiency could be predicted in comparison with experimental data. From the results of analysis of ANOVA, the most influential factor is the amounts of silicone carbon, the contribution of which is 65.07%; and the value of surface roughness will be decreased from Ra0.2733 um. down to Ra0.0234um via the optimal combination of working parameters, the improvement of which is by 91.43%.
27
Chen, Yan-Ting, i 陳彥廷. "Effect of Magnetic Brush Direction on Abrasive Finishing of Stainless Steel Cylindrical Surface". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/de26nf.
Pełny tekst źródłaStreszczenie:
碩士國立中山大學
機械與機電工程學系研究所
107
In this study, a horizontal magnetic brush tool composed of iron powders was used to investigate the effects of the load (0.5 N~1.05 N), the iron powder weight (0.1 g~0.2 g) and the magnetic brush shaping (natural forming, pre-shaping) on the contact area and height after the contact between the magnetic brush and the workpiece. When the workpiece and the tool were not rotating, the contact area and the height of the magnetic brush increased along with the weight of the iron powders. In addition, as the load increased, the contact area also increased, while the magnetic brush height decreased and then approached a saturation value. The contact area of the pre-shaped magnetic brush was smaller than that of the naturally formed magnetic brush; and the height of the pre-shaped magnetic brush was greater than that of the naturally formed magnetic brush. When the workpiece is rotated and the tool is not rotating, the contact area was slightly increased and the magnetic brush height was slightly decreased. The magnetic brush shifted in the direction of rotation of the workpiece, and some of the magnetic brush links was broken. When both the workpiece and the tool were rotated, the contact area was greatly increased, and the height of the magnetic brush was greatly reduced. Finally, the 304 stainless steel cylindrical workpiece was polished using circulating cutting fluid mixed alumina abrasive grains and iron powders to observe the variation of the surface roughness of the workpiece at the weight 0.2 g of the iron powders, the load of 0.65 N, the pre-shaping magnetic brush, and the rotating tool. Results showed that the surface roughness could decreases from Ra =0.257 µm、Rmax = 1.025 µm to Rmax = 0.091 μm、Ra = 0.021 μm after a polishing time of 8 minutes at the rotating speed 400 rpm of workpiece, and the rotating speed 60 rpm of the tool.
28
KE, Yan-Lin, i 柯諺霖. "Study The Effect of Nitrde Hardening Stainless Steel in The Magnetic Gel Abrasive Finishing". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/38476268272548882065.
Pełny tekst źródłaStreszczenie:
碩士健行科技大學
機械工程所
101
The finishing of #304 stainless steel in the market is mostly by electropolished to get smoothy and shine surface. However, these finishing methods must undergo longer time and environmental pollution. Magnetic abrasive finishing is a fast and high precision approach, but the magnetism of magnetic abrasive is reduced when finishing #304 stainless steel, and because the centrifugal force generated tends to throw abrasive away from the processing area, the efficency of finishing is thus decreased. This study mainly focuses on the effect of the magnetic gel abrasives at stainless steel surface, and experiment the finishing efficiency of single factor. We used high polymer material gels as binders and restrained magnetic and hard abrasive grains in the gels to form magnetic gel abrasives. Since the gel abrasives are viscous, they can not only wrap around the abrasive grains to prevent from spreading, but also attach tightly onto the surface of stainless surface. We placed the magnetic gel abrasives on stainless steel surface to conduct finishing, and experiments using the Taguchi method and L18 orthogonal array are performed based on different abrasives rata to investigate the changes in surface roughness and material removal rate…The results showed that after 35min of stainless steel finishing choose right abrasive rata and steel grit, the surface roughness can be decreased from Ra0.2936μm to Ra0.0136μm, and the roughness improvement rate of this process would reach 95% and resistance repellency can be improved with surface smoothing. This proves that the magnetic gel abrasive finishing developed in this study has outstanding finishing effect on stainless steel.
29
Chung, Cheng-Chun, i 鍾承君. "Study on the Polishing Effects of Stainless Tubes in Magnetic Finishing with Gel Abrasive". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/54853935850137109481.
Pełny tekst źródłaStreszczenie:
碩士清雲科技大學
機械工程所
99
Magnetic abrasive finishing(MAF) is a fast and high-precision polishing method. However, the magnetic force of abrasive particles will drop when polishing non-permeability material such as SUS304 stainless steel tube. Moreover, the abrasive particles will be moved off the surface of machining area due to the centrifugal force of rotation, and reduce the stability of polishing. Therefore, this study developed a series of gels as the bonding material to combine the permeability abrasive particles and hard abrasive particles, then consisted a series of permeability abrasive gels. Generally, those abrasive gels have higher viscosity to dominate the flow property that will constrain uniform motion of the abrasive particles in MAF, and the abrasive gels can be tightly contacted to the wall surface to increase the stability of polishing. This investigation is focus on the effectiveness of permeability abrasive gels to polish the inner surface of SUS304 stainless steel tube. The changes of surface roughness and removal material volume are studied by utilizing different viscosities of permeability abrasive gels and different machining conditions. Furthermore, a series experiments were conducted to verify the optimum parameters of the MAF machining by using Taguchi method. In this study, the software of ANSYS is adopting to simulate the distribution of magnetic field in order to reduce the experimental counter of try and error. According to the analytical results, we also designed a suitable magnetic mechanism for this study case of polishing non-permeability material. Finally, the testing results using Taguchi method indicated that using water-based Shar-Pei gel of a lower viscosity with optimizing experimental parameters to polish SUS304 stainless steel tube for 30 minutes, the value of surface roughness can be reduced from 0.636μm Ra to 0.05μm Ra, and the amount of removal material is as high as 218.4mg. The roughness improvement rate of permeability abrasive gels is roughly 92.1%, it demonstrated that permeability abrasive gels of our developmental material combined with Taguchi method have excellent polishing performance for stainless steel tube.
30
Jhou, Jhan-Huang, i 周展煌. "The Development and Application of The Device of Two-Dimensional Vibrration Assisted Magnetic Abrasive Finishing". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/98804149799983645633.
Pełny tekst źródłaStreszczenie:
碩士國立中央大學
機械工程研究所
98
The normal vibration directions of vibration-assisted magnetic abrasive finishing are all parallel or perpendicular to the surface of workpiece. Its shortcomings are easily lead to more scratches on the surface, and difficult to obtain mirror effect. This study break through previous studies, design a mechanism of two-dimensional (XY plane) vibration assisted to magnetic abrasive finishing. After a series of experiments, we get a better surface quality and enhanced efficiency compared to non-vibrational assisted magnetic abrasive finishing. Taguchi experiment verifies that, the best parameters which improve surface roughness most is: working gap 1mm, SiC weight of 1g, steel weight 1.5g, motor oil weight 3g, platform rotational speed 1000rpm, SiC mesh # 8000, steel mesh # 120, magnet pole rotational speed 500rpm (A1B1C2D3E3F3G3H2). The experiments proved that vibration-assisted magnetic abrasive finishing method in the best parameter combinations, can effectively improve the stainless steel surface roughness from Ra0.13μm to 0.03μm within 5 minutes, improvement rate 77%. After finishing for 25 minutes, the surface roughness is down to Ra0.01μm, the surface improvement rate increase to 92.3%. Without the assisted vibration, after finishing 5 minutes the roughness is Ra0.05μm, the improvement rate is only 61.54%. This proves that two-dimensional vibration assisted magnetic abrasive finishing method can save processing time and can effectively improve the finishinging efficiency and then save the cost of process. Through the statistical analysis, we have a non-linear regression model, and then use a variety of test, analysis and evaluation, getting that the interactions between parameters are not obvious, and the model have significant prediction ability.
31
Lee, Yi-hsun, i 李宜勳. "Development and Implementation of Equipment on Planetary Motion Combined with Two-Dimensional Vibration-Assisted Magnetic Abrasive Finishing". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/57111577780869577997.
Pełny tekst źródłaStreszczenie:
博士國立中央大學
機械工程學系
103
This study develops a new surface polishing approach by combining planetary motion (PM) with two-dimensional vibration-assisted magnetic abrasive finishing (PM-2DVAMAF). Planetary motion involves both rotation and revolution, thus generating radial acceleration, which strengthens the normal force exerted on the workpiece surface, and in turn enhances the cutting power of the abrasives and their polishing performance. First, investigate adding the two-dimensional vibration-assisted influence on the processing of MAF. From experimental results, 2D VAMAF can effectively increase the polishing efficiency of MAF and improve surface quality. In addition to MAF by steel particles and SiC abrasives, dense intersecting machining paths on the workpiece are also formed under vibration assistance, thus contributing to better polishing efficiency and precision. With 5-min 2D VAMAF under optimal parameter combination, the surface roughness of a stainless steel SUS304 workpiece can be reduced from 0.13 μm to 0.03 μm, an improvement of 77%. Further discussion PM-2DVAMAF, PM results in uniform, intersecting and closely packed polishing paths, which contribute to better surface quality within a shorter processing time. Experimental results reveal that 12.5-min PM-2DVAMAF under optimal parameter combination can reduce surface roughness of a stainless steel SUS304 workpiece from 0.16 μm to 0.032 μm, an improvement of 80%.
32
Pandey, Kheelraj. "Experimental investigations and modeling of surface roughness of silicon wafer polished by chemically assisted double disk magnetic abrasive finishing". Thesis, 2018. http://localhost:8080/iit/handle/2074/7583.
Pełny tekst źródła