表面织构对刀具切削性能及前刀面摩擦特性的影响

Effect of the Textured Surface on the Cutting Performance of the Tool and the Friction Property for the Rake Face

为了研究刀具表面织构对切削性能的影响,通过控制前刀面上微凹坑的直径、深度和面积占有率等参数制备了两组表面高度算术平均值Sa相同的织构刀具.使用Talysurf CCI Lite非接触式三维光学轮廓仪对织构表面进行测量,采用ISO25178参数对测量表面进行表征;通过SL200KS接触角测量仪测量织构刀具前刀面湿润性的变化;随后在CA6140车床上进行45钢切削试验,研究不同织构对切削力、前刀面摩擦特性、工件表面粗糙度和切屑形变的影响.结果表明:合理的表面织构能够改善刀具的切削性能;切削液在前刀面铺展较快的织构刀具获得了较好的切削性能;凹坑直径、深度和面积占有率的协同作用对改善刀具切削性能至关重要,为了协调这三个织构参数,进一步研究三维表征参数Sku、Ssk、Sv、Vvv、Vvc、Sdv、Sda、Spd与刀具切削性能的关联性,为刀具表面设计提供了基础.

In order to study the effect of the tool surface texture on the cutting performance,by controlling the diameter,depth and area density of micro pit on the rake face,two groups of the textured tool with the same surface arithmetic average height Sawere designed and manufactured. All the textured surfaces were measured by non- contact 3D optical profiler Talysurf CCI Lite and characterized by ISO25178. The wettability of JR3 A cutting fluid on the textured surface was measured by SL200 KS contact angle meter. Then,cutting experiments of 45#steel were conducted using the non- textured and textured tool on a CA6140 lathe,and the effect of the different texture on the cutting force,frictional characteristics for the rake face,the machined surface roughness and the chip deformation was discussed. The results show that appropriate surface texture improved the cutting performance. The textured surface which possessed a higher speed of cutting fluid spread had better cutting performance. The synergy of the diameter,depth and area density of micro pit was crucial for improving the cutting performance. To coordinate theses texture parameters,the relevance between three- dimensional characterization parameters of the surface morphology Sku、Ssk、Sv、Vvv、Vvc、Sdv、Sda、Spdand the cutting performance were researched which can provide the basis for the tool surface design.