硬质合金刀片前刀面的剪切增稠抛光实验研究

目的 采用柔性的剪切增稠抛光(STP)方法抛光开设有弧形断屑槽的硬质合金刀片前刀面,降低其粗糙度,提高刀具的切削性能.方法 利用非牛顿幂率流体的剪切增稠效应与磨粒的微切削作用,实现对工件粗糙表面的微凸峰去除.以前刀面断屑槽的表面粗糙度为评价指标,采用田口法设计正交实验,分析抛光速度、磨粒浓度、倾斜角度以及磨粒粒度等抛光...

Experimental Study on ShearingThickening Polishing of Rake Surface of Cemented Carbide Inserts

A flexible shearing thickening polishing (STP) method can be used to polishthe rake surfaceof the cemented carbide insert with arcchipbreakerto reduce theroughnessofthe rakesurfaceandimprovethe cutting performance of the insert. The method utilizes the shearing thickening effect of non-Newtonian power-law fluid and the micro-cutting effect of abrasive particles to remove the micro-convex peaks on the rough surface of the workpiece. The surface roughness of the chipbreaker of the cemented carbide insert rake surfaceisused as the evaluation index. The Taguchi method is used to design the orthogonal experiment, and the influence of polishing speed, abrasive concentration, abrasive particlesize and inclination angle on the surface roughness of the insertrake surfaceisanalyzed. The analysis of variance (ANOVA) method, which is used to evaluate the effective weight of each factor, shows that the largest affecting factor forthe surfaceroughnessis the polishing speed (74%), followed by the abrasive particle size (11%), the abrasive concentration (11%) and theinclination angle (4%). Under the optimized processparameter combination:polishing speed 85 r/min, abrasive concentration 9wt%, inclination angle 2° and abrasive particlesize #8000, the surface roughness decreases from (120±20) nm to (7.2±0.6) nm, the rough micro-convex peaksbecome smoothand the cutting edge is complete without defects. Compared with traditional brush polishing method,STP method can realize higher efficiency and better quality for polishing the rake surface of the cemented carbide insert. By optimizing the polishing process parameters, the surface quality of the insert can be effectively improved and no defects are caused on the cutting edge. The result shows that the STP is a promising method for the efficient and high-quality polishing of the cemented carbide insert.