The Experts below are selected from a list of 7884 Experts worldwide ranked by ideXlab platform
J P Chen - One of the best experts on this subject based on the ideXlab platform.
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analysis of the wear of a resin bonded diamond wheel in the grinding of tungsten carbide
Journal of Materials Processing Technology, 1997Co-Authors: Y S Liao, C C Chou, J P ChenAbstract:Abstract This paper describes experimental results using a resin-bonded diamond wheel in the vertical dry grinding of P10 grade tungsten carbide. The conditions of the diamond Abrasive Cutting edge on the worn wheel surface, the bonding state between the Abrasives and the matrix, and the grinding performance were investigated. It was found that for interrupted dry grinding, the Abrasive Cutting edges occurring on the worn wheel surface are mainly of protrusive (good) particles and the number of pull-out holes is also high as well, leading the wheel to produce a higher grinding ratio. However, under a greater stock removal rate, the grinding ratio would be reduced rapidly. When continuous dry grinding was employed, the resulting worn Abrasives produce a greater proportion of particle pull-out and coated grit exposed on the wheel surface, thereby causing very poor grinding performance. Graphite fillers added to the resin bond have a positive influence on the grinding performance of the wheel in dry grinding. In addition, the roughness of the ground surface is similar to that effected by mechanical polishing.
Ferhat Kara - One of the best experts on this subject based on the ideXlab platform.
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Investigation on the performance of SiAlON ceramic drills on aerospace grade CFRP composites
Journal of Materials Processing Technology, 2015Co-Authors: Ali Çelik, Alpagut Kara, Ismail Lazoglu, Ferhat KaraAbstract:Carbon fiber reinforced polymer (CFRP) composites are widely used in aircraft structure due to their outstanding physical and mechanical properties. Drilling is one of the most critical operation in the handling of CFRP composites, since the delamination free holes with high dimensional accuracy are required for assembly. The quality of the machined holes strongly depends on machining conditions, tool geometry and tool wear. There are a limited number of tool materials which can survive in the Abrasive Cutting conditions formed by the fractured carbon fibers during drilling. SiAlONs are promising materials for the machining of CFRP composites due to their superior Abrasive wear resistance. SiAlON ceramics have been reported for the first time in the literature as Cutting tool materials for drilling of CFRP composites in this study, where α/β-SiAlON drilling tools with four different sets of common drill geometries were manufactured and tested extensively on drilling of aerospace grade CFRP composites. The effects of Cutting parameters and geometrical features of novel α/β-SiAlON drilling tools on the Cutting forces and the peel-up delamination of the machined holes were investigated. It was observed that the point angle and chisel edge length of the novel SiAlON drilling tools are the main parameters that affect the maximum thrust force and delamination during drilling. The thrust force exhibited an increase during drilling tests, indicating that an Abrasive wear occurs at the Cutting edges of the SiAlON drilling tools.
Y S Liao - One of the best experts on this subject based on the ideXlab platform.
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analysis of the wear of a resin bonded diamond wheel in the grinding of tungsten carbide
Journal of Materials Processing Technology, 1997Co-Authors: Y S Liao, C C Chou, J P ChenAbstract:Abstract This paper describes experimental results using a resin-bonded diamond wheel in the vertical dry grinding of P10 grade tungsten carbide. The conditions of the diamond Abrasive Cutting edge on the worn wheel surface, the bonding state between the Abrasives and the matrix, and the grinding performance were investigated. It was found that for interrupted dry grinding, the Abrasive Cutting edges occurring on the worn wheel surface are mainly of protrusive (good) particles and the number of pull-out holes is also high as well, leading the wheel to produce a higher grinding ratio. However, under a greater stock removal rate, the grinding ratio would be reduced rapidly. When continuous dry grinding was employed, the resulting worn Abrasives produce a greater proportion of particle pull-out and coated grit exposed on the wheel surface, thereby causing very poor grinding performance. Graphite fillers added to the resin bond have a positive influence on the grinding performance of the wheel in dry grinding. In addition, the roughness of the ground surface is similar to that effected by mechanical polishing.
Mark Daine - One of the best experts on this subject based on the ideXlab platform.
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ordered diamond micro arrays for ultra precision grinding an evaluation in ti 6al 4v
International Journal of Machine Tools & Manufacture, 2011Co-Authors: Paul Butlersmith, Dragos Axinte, Mark DaineAbstract:Abstract The surface topography of a conventional diamond grinding wheel can be characterised as having a perplexity of Abrasive particles with random crystallographic orientations resulting in different heights of protrusion from the bond and inherent varying inter-particle spacing. The number and effectiveness of the Abrasive particles during grinding depends on factors such as the Abrasive concentration, the crystallographic shape and the extent of particle protrusion from the wheel’s surface. The consequence of this random layout inhibits the optimal performance of individual Abrasives in the process of material removal, and where particles are clustered, chip flow is negatively affected. This paper reports on the evaluation of purpose designed precision diamond micro-arrays for the grinding a case-study material, Ti–6Al–4V and compares their performance against conventional diamond electroplated micro-Cutting elements of D91 and D46 Abrasive size in an imitated grinding setup. The precision diamond micro-arrays, produced from thick film CVD diamond utilising energy beam ablation offer an optimised layout of Abrasive elements, each having a Cutting width of 100 μm of identical crystallographic orientation, protrusion height and regular spacing to provide chip flow paths. In addition, the primary/secondary rake angles γ=−32°/+1° and clearance angle α=4.5° of each Abrasive Cutting element have been controlled in order to provide an enhanced Cutting action. The precise layout of the Abrasive Cutting elements of the micro-arrays produced superior chip flow compared with the diamond electroplated grinding elements; this has been proven by in-depth scanning electron microscopy of the clogged workpiece material on the studied Abrasive elements. The results show a 3.5 times improvement to surface finish and a 21.5 times improvement to flatness of the Ti–6Al–4V workpieces when ground with the proposed innovative diamond micro-arrays.
Takeo Shinmura - One of the best experts on this subject based on the ideXlab platform.
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study of the surface modification resulting from an internal magnetic Abrasive finishing process
Wear, 1999Co-Authors: Hitomi Yamaguchi, Takeo ShinmuraAbstract:An internal magnetic Abrasive finishing process was proposed for producing highly finished inner surfaces of tubes used in critical applications including clean gas or liquid piping systems. Most of the previous research has explored the process characteristics and mechanism from a macroscopic point of view making use of surface roughness profiles. However, those approaches did not adequately characterize the behavior of Abrasive Cutting edges acting against the surface to remove material in the process. This paper examines the microscopic changes in the surface texture resulting from processing. In addition to the surface roughness measurement, atomic force and scanning electron microscopy were used to characterize the material removal process and provide a fundamental understanding of the process mechanism. The observed surface texture shows that the process is an accumulation of the micro-scratches from the Abrasive Cutting edges, generating a characteristic magnetic Abrasive finished surface. Moreover, the surface is finished by removing the material from not only the peaks but also the valleys of the surface, as far as the Cutting edges of the magnetic Abrasive are introduced into the valleys. However, the relatively longer wavelength components of the roughness profile tend to remain on the surface after processing; this shows that the magnetic Abrasive finishing process belongs to the category of pressure-copying processes.
