超声椭圆振动切削硬质合金脆性-延性转变临界条件研究  

Critical Conditions of Brittleness-ductility Transition in Ultrasonic Elliptical Vibration Cutting of Tungsten Carbide

作　　者：段鹏[1] 焦锋[1] 赵波[1] 李杰[1] 牛赢[1] 

机构地区：[1]河南理工大学机械与动力工程学院,河南焦作454000

出　　处：《机械科学与技术》2017年第7期1073-1078,共6页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(51075127)资助

摘　　要：为了实现硬质合金的高效延性加工,联系硬脆材料表面生成裂纹的临界载荷与超声椭圆振动切削硬质合金的主切削力,建立超声椭圆振动切削硬质合金脆性-延性转变的临界切削深度模型,研究切削速度、刀具圆弧半径、椭圆振动频率、振幅、硬质合金的硬度、断裂韧性与临界切削深度的关系;通过仿切削刻划试验,验证了切削速度与硬质合金的硬度、断裂韧性对临界切削深度的影响规律;对比普通切削,超声椭圆振动切削有利于提高硬质合金的临界切削深度,在改善加工表面质量及精度的前提下,提高了加工效率。In order to realize efficiency and ductile machining of tungsten carbide （WC）, the model for critical depth of cutting for brittleness-ductility transition of WC in ultrasonic elliptical vibration cutting （ UEVC ） was established, considering the critical load for generating crack on the surface of hard brittle materials and the principal cutting force for WC in UEVC. The effects of the cutting speed, tool radius, elliptical vibration frequency, amplitude, hardness and fracture toughness of WC on the critical depth of cutting were analyzed with the theoretical formulae. Based on the imitation cutting scribing experiment, the influence of the cutting speed, hardness and fracture toughness of WC on the critical depth of cutting was investigated. It is understood that the critical depth of cutting in UEVC can be increased as comparing with the conventional cutting （CC） and the processing efficiency can be improved under the premise of improving the surface quality and accuracy.

关 键 词：硬质合金 脆性-延性转变 临界切削深度 超声椭圆振动切削 

分 类 号：TG663[金属学及工艺—金属切削加工及机床]