超声振动和切削液联合作用下的刀刃非物理锐化

发布时间：2018-04-06 05:32

本文选题：超声辅助切削　切入点：切削液　出处：《机械工程学报》2017年19期

【摘要】：超声辅助切削和切削液的联合使用能减小切削力和降低表面粗糙度,试图说明其机理,目的是为开发精密和超精加工技术打下基础。超声辅助切削和切削液的联合使用,从性质上改变了刀刃施加给工件表面的作用力,包括摩擦力和压力:在无切削液情况下,刀刃切入时,前刀面和后刀面施加给被切削面的摩擦力方向是指向刀刃;在有切削液情况下,刀刃切入时,前刀面和后刀面施加给被切削面的摩擦力方向是背向刀刃。背向刀刃的摩擦力,相对于指向刀刃的摩擦力而言,会导致剪切角增大,等效于更锋利的刀刃所产生的剪切角;切削液的存在使得刀刃施加给工件的力更加集中,等效于圆角半径更小的刀刃所能达到的效果;切削液在刀尖部位的压力分布不利于工件表面产生微裂纹。也就是说,超声辅助切削和切削液的联合使用起到了更锋利即更小圆角半径刀刃所起的效果,称之为非物理锐化。
[Abstract]:The combined use of ultrasonic assisted cutting and cutting fluid can reduce the cutting force and the surface roughness, and try to explain its mechanism, in order to lay a foundation for the development of precision and ultra-precision machining technology.The combined use of ultrasonic assisted cutting and cutting fluid changes the force applied by the blade to the surface of the workpiece, including friction and pressure: in the absence of cutting fluid, when the blade is cut in,The direction of friction applied to the cutting face by the front face and the rear face is directed towards the blade, and when the cutting edge is cut in, the direction of friction applied to the cutting face by the front face and the rear face is the back direction of the cutting edge, and when the cutting edge is cut in the case of cutting fluid, the direction of friction applied to the cutting face by the front face and the rear face is the direction of back direction.The friction on the back edge, relative to the friction on the edge, increases the shearing angle, which is equivalent to the shear angle generated by the sharper blade; the presence of the cutting fluid makes the force applied by the blade to the workpiece more concentrated.The pressure distribution of the cutting fluid at the tip of the cutter is not conducive to the micro-crack on the surface of the workpiece.That is to say, the combination of ultrasonic assisted cutting and cutting fluid has the effect of sharper or smaller radius edge, which is called non-physical sharpening.
【作者单位】：集美大学机械与能源工程学院;
【基金】：国家自然科学基金(51175225) 福建省自然科学基金(2017J01700) 福建省科技重点项目(2017H0025)资助项目
【分类号】：TG501.5;TG663

【相似文献】