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为了解决微粒金刚石砂轮在超精密磨削中的各种问题,探讨了开发具有导电性金刚石刃口的金刚石砂轮的可能性。着眼于导电性金刚石原材料的新型金刚石砂轮可望(1)利用电火花加工进行精密而且简便的成形;(2)实现高浓度化;(3)兼有足够的气孔和微细刃口;(4)利用低比电阻非接触检测刃口;(5)由于高的热稳定温度而适用于磨削铁系材料。经过探讨可考虑的各种金刚石砂轮及其生产方法,新型导电性金刚石砂轮可分为(a)无结合剂导电性金刚石砂轮和(b)有结合剂导电性金刚石砂轮两种。经过尝试利用电火花加工在导电性CVD金刚石薄膜表面创建砂轮的刃口,发现可根据放电条件创建凹凸不同的刃口。利用贴有创建了微细刃口的金刚石片的研磨砂轮在恒压紧力条件下研磨硬质合金,其镜面粗糙度可达R y=0.110μm、R a=0.008μm。另外,作为微细磨削加工用砂轮,制作了V形砂轮和带轴砂轮,可对硬质合金进行V形槽磨削,且砂轮几乎不会发生磨损。
In order to solve the various problems in ultra-precision grinding of the microparticle diamond grinding wheel, the possibility of developing the diamond grinding wheel with the conductive diamond edge was discussed. (1) Precise and easy forming by electric discharge machining; (2) High concentration; (3) Sufficient pores and fine cutting edges; (4) New diamond grinding wheel focusing on conductive diamond raw material Using low resistivity non-contact detection edge; (5) due to the high thermal stability of the temperature suitable for grinding iron-based materials. After discussing various diamond grinding wheels that can be considered and their production methods, the new conductive diamond grinding wheels can be classified into (a) a binderless conductive diamond wheel and (b) a binder conductive diamond wheel. After trying to create the edge of the grinding wheel on the surface of the conductive CVD diamond film by EDM, we found that it is possible to create different concave and convex edges according to the discharge conditions. The cemented carbide was ground under a constant pressure using a grinding wheel affixed with a diamond blade having a micro-edged blade. The mirror surface roughness was R y = 0.110 μm and R a = 0.008 μm. In addition, as a grinding wheel for fine grinding, a V-shaped grinding wheel and a shaft grinding wheel were manufactured, and the carbide was subjected to V-groove grinding with little abrasion of the grinding wheel.