Study of Grinding Wheel for Polishing Diamond by Dynamic Friction Polishing

2014 ◽  
Vol 1017 ◽  
pp. 304-309 ◽  
Author(s):  
Shuang Ji Shi ◽  
Jia Zhi Lin ◽  
Zhu Ji Jin ◽  
Xiao Guang Guo ◽  
Ping Zhou ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Chemical Change ◽  
High Hardness ◽  
Mechanical Effect ◽  
Grinding Wheel ◽  
Dynamic Friction ◽  
Powder Metallurgy Technique ◽  
Innovative Method ◽  
Catalytic Metal ◽  
Synergistic Reaction

Diamond is widely used in the fields of precise and ultraprecise machining because of its superlative characters. Due to high hardness and great brittleness of diamond, the grinding of diamond needs a kind of high effective and stable polishing method. Dynamic friction polishing (DFP) is deemed to be an innovative method by means of a synergistic reaction of mechanical effect and chemical change. The condition of high pressure and high temperature puts forward a high requirement for mechanical property of the grinding wheel in DFP, other than that, the graphitization of diamond catalyzed by catalytic metal is also a focus of research. In this paper, the transition metals with unpaired d electrons were selected as polishing materials, and powder metallurgy technique was used to prepare alloy grinding wheel for polishing diamond by dynamic friction polishing.

Effect of Complex Electrodischarge Grinding for Electrically Conductive PCD

2011 ◽  
Vol 325 ◽  
pp. 276-281 ◽  
Author(s):  
Manabu Iwai ◽  
Shinichi Ninomiya ◽  
Kiyoshi Suzuki
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Surface Condition ◽  
High Hardness ◽  
Grinding Wheel ◽  
Wheel Wear ◽  
Electrically Conductive ◽  
Grinding Method ◽  
Conventional Grinding ◽  
Composite Diamond

Polycrystalline Composite Diamond (PCD) is excellent in chipping resistance despite its very high hardness. However, it is not easy to EDM or grind PCD. To realize high efficiency and high quality processing of PCD simply and at low cost, the authors devised new PCD (EC-PCD) by using electrically conductive diamond particles and applied a complex electrodischarge grinding method. In this study, investigation is made on effective grinding condition to realize high efficiency, low and stable grinding force and low wheel wear in complex electrodischarge grinding. As a result, superior grinding property was obtained when the grinding wheel was set at minus polarity, and set peak current of iP = 4 and 6 A was applied. Furthermore it also became clear that additional conventional grinding process followed after complex electrodischarge grinding improved the surface condition.

Wear of Diamond Grinding Wheel during Low Speed Dressing by Alumina

2015 ◽  
Vol 658 ◽  
pp. 120-124
Author(s):  
Tachai Luangvaranunt ◽  
Natthawat Tangkaratanakul ◽  
Patchanok Sakultantimetha
Keyword(s):  
High Hardness ◽  
Large Mass ◽  
Diamond Wheel ◽  
Grinding Wheel ◽  
Work Piece ◽  
Wheel Wear ◽  
Diamond Grinding Wheel ◽  
Diamond Grinding ◽  
Dressing Tool ◽  
Pin On Disk

Diamond grinding wheel is used in high precision grinding process, when work piece has a very high hardness. For a specific grinding interval, the wheel must be properly dressed, in order to remove swarf, sharpen the worn diamond grits, open up new diamond protrusions, and recondition the bond material. Dressing of diamond grinding wheel by alumina dressing tool has been simulated in a pin-on-disk machine in the research. Sharpening of the wheel is indicated by the increase of its roughness value, and surface microstructure with protruding sharp diamond grits. It was found that increasing of sliding distant from 100 to 500 m will increase the roughness of the wheel. The increase of contact load from 10 to 20 N will also increase roughness of the wheel, and the severity of wheel wear, indicated by high values of friction coefficient. A proper dressing of this nickel bonded SD1200 diamond wheel is by sliding against alumina dressing tool for at least 300 m under 10 N load. Sliding velocity has minimal effect to the results. A too large sliding distant and load will cause severe damage to wheel surface, and severe wheel wear, indicated by its large mass loss.

Experiment Study on ELID Grinding of TN85 Cermets

2011 ◽  
Vol 175 ◽  
pp. 131-135
Author(s):  
Fu Qiang Tong ◽  
Fei Hu Zhang ◽  
Dian Rong Luan
Keyword(s):  
Metal Matrix ◽  
High Hardness ◽  
Diamond Powder ◽  
Diamond Wheel ◽  
Precision Machining ◽  
Grinding Wheel ◽  
Powder Particle Size ◽  
Matrix Composites ◽  
Elid Grinding ◽  
Ultra Precision

TN85 cermets is one kind of particle reinforced metal matrix composites, which is high hardness, good wear resistance, and bring great difficulties in processing, so it is necessary to study the processing performance. During the test on ELID grinding TN85 cermets, it is found that plastic removal is the main ways during grinding TN85 cermets materials. The powder particle size of W2.5 diamond wheel is successfully used in full removal of TN85 cermets plastic, the surface roughness value of rms: 16.81nm and Ra: 12.52nm. The results showed that: ELID grinding wheel with diamond powder technology can be used in ultra-precision machining TN85 cermets.

Research on the Advanced Ceramic Die Materials and Their Properties

2008 ◽  
Vol 375-376 ◽  
pp. 133-137 ◽  
Author(s):  
Chong Hai Xu ◽  
Guang Chun Xiao ◽  
Rong Bo Zhang ◽  
Yu Mei Feng
Keyword(s):  
Mechanical Property ◽  
High Hardness ◽  
Ceramic Materials ◽  
High Wear Resistance ◽  
Ceramic Surface ◽  
Temperature Property ◽  
Nano Composite ◽  
Advanced Ceramic ◽  
Die Materials ◽  
High Temperature Property

The composition, processing technology, mechanical property and engineering performance of ceramic materials such as cermet, ZTA, TZP, TZP/Al2O3, PSZ, Si3N4 and Sialon, etc, have been predominantly summarized when they are used as die materials in various operations such as drawing, extrusion, punching and stamping etc. The problems existed in the research and application of ceramic die materials are discussed, and the perspectives in the application of ceramic die materials are pointed out. It is concluded that advanced ceramic material is one of the most promising die materials because of its high hardness, high wear resistance, superior high-temperature property and chemical stability and good engineering performance, compared with other die materials such as die steel and cemented carbides. It is proposed that nano composite and functionally gradient ceramic, surface modification technology with ceramic, optimal design of die structures and die reliability research, etc. are all the potential and effective methods in the improvement of mechanical property and engineering performance of ceramic die materials.

Effects of Impregnation of Grinding Wheel on Grinding Hardened Tool Steel

1985 ◽  
Vol 9 (1) ◽  
pp. 39-44 ◽  
Author(s):  
M.A. Younis ◽  
H. Alawi
Keyword(s):  
Structural Changes ◽  
Metal Removal ◽  
Removal Rate ◽  
Ground Surface ◽  
High Hardness ◽  
Grinding Wheel ◽  
Tool Steels ◽  
Wheel Wear ◽  
Beneficial Effects ◽  
Hardened Tool Steel

The high hardness and chemical effects of tool steels M2 and T15 cause a rapid grinding wheel wear and micro structural changes in the ground surface. The performance of sulphur-, wax-, and varnish-impregnated grinding wheels in grinding hardened tool steels M2 and T15 is investigated and compared with the performance of conventional alumina wheels. Impregnation with sulphur had in all cases beneficial effects by decreasing the grinding forces, increasing the maximum metal removal rate, improving surface integrity, and increasing considerably the grinding ratio. It also gave cost saving compared to the plain grinding wheel. The improvement was a result of the sulphur being more efficiently supplied into the chip formation process as compared to using grinding coolant only.

Grinding Characteristics of Sapphire Using ELID and High Hardness Iron Plating Grinding Wheel

2018 ◽  
Vol 2018 (0) ◽  
pp. YC2018-097
Author(s):  
Kazuki SHIMIZU ◽  
Nobuhide ITOH ◽  
Hitoshi OHMORI ◽  
Takashi MATSUZAWA ◽  
Katsufumi INAZAWA
Keyword(s):  
High Hardness ◽  
Grinding Wheel ◽  
Iron Plating

Development on Micro Precision Truing Method of ELID-Grinding Wheel (1st Report: Principle & Fundamental Experiments)

2005 ◽  
Vol 291-292 ◽  
pp. 207-212 ◽  
Author(s):  
Hitoshi Ohmori ◽  
Shao Hui Yin ◽  
Wei Min Lin ◽  
Yoshihiro Uehara ◽  
Shinya MORITA ◽  
...  
Keyword(s):  
High Precision ◽  
High Efficiency ◽  
High Hardness ◽  
Experimental Results ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Grinding Wheels ◽  
Elid Grinding ◽  
High Toughness ◽  
Diamond Grinding

Metal bonded diamond grinding wheels are widely used in the grinding process, especial in ELID grinding. However, truing is difficult owing to the high toughness of metal bond materials and high hardness of diamond abrasives. To realize high precision and high-efficiency truing, we propose a new micro-truing method consisting of electro-discharge truing and electrolysis-assisted mechanical truing in this paper. The process principle and fundamental experimental results are introduced, and the truing performance is discussed. Research results show that the proposed new method is effective for truing metal bonded diamond grinding wheels.

Mechanical Property and Microstructure of Ti-Ta-Ag Alloy for Biomedical Applications

2012 ◽  
Vol 520 ◽  
pp. 254-259 ◽  
Author(s):  
Ming Wen ◽  
Cui E Wen ◽  
Peter D. Hodgson ◽  
Yun Cang Li
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Elastic Modulus ◽  
Spark Plasma Sintering ◽  
Biomedical Applications ◽  
High Hardness ◽  
Vacuum Sintering ◽  
Preparation Methods ◽  
Plasma Sintering ◽  
Spark Plasma

Ti and some of its alloys (e.g. Ti–6Al–4V alloy) have become the metals of choice for the endosseous parts of presently available dental implants. In the present study, Ti-Ta-Ag alloys with a different Ag content were prepared using vacuum sintering (VS) and spark plasma sintering (SPS) process. The microstructure and mechanical properties of the Ti-Ta-Ag alloys were investigated. The results show that dense Ti-Ta-Ag alloys prepared using the SPS process exhibit high hardness and a suitable elastic modulus for implant materials for load-bearing applications. The effect of preparation methods on the microstructure of Ti-Ta-Ag alloys is discussed.

Wear Mechanisms in Grinding of PCBN

2016 ◽  
Vol 1136 ◽  
pp. 555-560 ◽  
Author(s):  
Berend Denkena ◽  
Thilo Grove ◽  
Leif Behrens
Keyword(s):  
Wear Mechanism ◽  
High Hardness ◽  
Economic Benefits ◽  
Production Costs ◽  
Grinding Wheel ◽  
End User ◽  
Wheel Wear ◽  
Steel Cast ◽  
High Feed ◽  
High Production

PCBN-inserts have a high potential in the cutting of hardened steel, cast iron and super alloys due to their high hardness and heat resistance. Nevertheless they have a high purchase price, which lowers the economic benefits for the end user compared to other cutting materials. This is caused by the high production costs of the inserts. The grinding of PCBN-inserts causes a major proportion of these costs as a result of the high grinding wheel wear. The primary wear mechanism is grain breakout followed by clogging of the grinding layer. This study shows that the efficiency of the grinding process can be increased significantly by applying low cutting speeds and high feed rates. In this case, splintering of the grinding grain is the main wear mechanism.

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