含断屑块PCD刀具主偏角对切屑流向的影响  

Effect of Cutting Edge Angle of PCD Tool with Chip Breaker on Chip Flow

作　　者：王家炜 于爱兵[1] 李毅 叶家往 赵家震 齐少春 WANG Jiawei;YU Aibing;LI Yi;YE Jiawang;ZHAO Jiazhen;QI Shaochun(Faculty of Mechanical Engineering and Mechanics,Ningbo University,Ningbo 315211,Zhejiang,China)

机构地区：[1]宁波大学机械工程与力学学院,浙江宁波315211

出　　处：《兵工学报》2024年第12期4488-4499,共12页Acta Armamentarii

基　　金：国家自然科学基金项目(51875294);宁波市科技创新重大专项项目(2021Z077)。

摘　　要：合理选用刀具角度能够提高含断屑块聚晶金刚石(Polycrystalline Diamond,PCD)刀具的切屑控制效果。用有限元模拟和高速摄影观察切削过程,分析主偏角对切屑流向的影响规律。提出切屑接触率的概念用来衡量断屑块对切屑流向的影响程度,收集并统计切屑类型,建立主偏角与切屑接触率之间的关系曲线,确定主偏角的合理取值范围。提出断屑块偏转角度参数,建立偏转角与切屑接触率之间的关系曲线。研究结果表明:增大主偏角会减弱断屑块对切屑流向的控制作用;当主偏角范围为75°~95°时,切屑能够流向工件表面并折断形成C形、6形和紧凑型短螺旋切屑;通过调整断屑块偏转角可以改善非合理主偏角切削条件下的断屑效果;选用合理的主偏角和断屑块偏转角度,能够提高含断屑块PCD刀具的切屑接触率,实现有效断屑,提高优良切屑比例。A tool angle can be reasonably selected to improve the chip control effect of polycrystalline diamond(PCD)tools with chip breakers.The cutting process is observed by finite element simulation and high-speed photography,and the influence of cutting edge angle on chip flow direction is analyzed.A concept of chip contact rate is put forward to measure the influence of chip breaker on chip flow direction,the types of chip are collected and counted,the relation curve between cutting edge angle and chip contact rate is established,and the reasonable value range of cutting edge angle is determined.The deflection angle parameters of chip breaker are presented,and the relation curve between the deflection angle and the chip contact rate is established.The results show that the increase in the cutting edge angle will weaken the control effect of chip breaker on the chip flow direction.When the cutting edge angle is in the range of 75°-95°,the chip can flow to the workpiece surface and break to form C-shaped,6-shaped and compact short spiral chips.and the chip breaking effect under the condition of unreasonable cutting edge angle can be improved by adjusting the chip deflection angle.Selecting the reasonable cutting edge angle and chip breaker deflection angle can improve the chip contact rate of PCD tool with chip breaker,realize the effective chip breaking and improve the excellent chip ratio.

关 键 词：聚晶金刚石刀具 切屑流向 断屑 主偏角 

分 类 号：TG712[金属学及工艺—刀具与模具]