氮化硅陶瓷的ELID高速磨削工艺试验研究

在采用封闭式阴极装置实现高速ELID磨削的基础上,对氮化硅陶瓷的ELID高速磨削工艺机理进行了研究.通过与非ELID高速磨削工艺的对比,揭示了氮化硅陶瓷ELID高速磨削的工艺机理,并给出了其表面粗糙度、磨削力与工艺参数之间的变化规律.这些规律表明:ELID高速磨削工艺能大大地减小氮化硅陶瓷的表面粗糙度值及磨削力,获得较好的表面质量.此外,砂轮线速度和磨削深度对其表面粗糙度值没有显著影响,且变化没有明显规律;而工件速度对表面粗糙度值存在一定的影响,表面粗糙度值随着工件进给速度的提高而增加,即表面加工质量有下降的趋势;ELID高速磨削工艺中的各类磨削参数均对氮化硅陶瓷的磨削力产生重大影响:磨削深度增加或工件速度的加快,都使磨削力变大;砂轮线速度的增加则导致磨削力下降.

Experimental Research on High-Speed ELID Grinding Process for Si3N4

On the basis of realizing Electrolytic In-process Dressing(ELID) grinding at high speed by using enclosed electrode,this paper studied the mechanism of ELID grinding at high speed for Si3N4 ceramics.By contrasting with non-ELID grinding at high speed,this paper clarified the mechanism of ELID grinding at high speed for Si3N4 ceramics,and gave some laws for ground surface roughness,grinding force and process parameters.These laws demonstrate that the ground surface roughness and the grinding forces for Si3N4 ceramics were reduced greatly by using ELID grinding at high speed,so better surface integrity was obtained.These laws also demonstrate that the grinding speed and the depth of cutting have slight influence on ground surface roughness,which increases with the increase of work piece speed,and the grinding force of Si3N4 ceramics is influenced greatly by all kinds of process parameters,which becomes larger when the depth of cutting or the work piece speed increases,but the grinding force is reduced with the increase of grinding speeds.