摘要
刀-屑界面滑移区的接触及微通道分布特性直接影响切削液的渗入和刀-屑界面摩擦,对金属切削过程有着重要的影响,针对滑移区接触及微通道分布特性测量难、切削液在刀-屑界面渗入不易量化等问题,建立微织构粗糙刀-屑界面滑移区的接触数值模型,分析滑移区的接触、微通道分布特性以及微织构作用机制。研究表明:滑移区存在3种不同的宏观接触特性,分别为近黏结特性、微通道特性和近分离特性;在近黏结特性区内,刀-屑界面不存在微通道,微织构主要功能为减少刀-屑界面接触面积;在微通道特性区内,刀-屑界面存在大量微通道,微织构主要功能为连接微通道;在近分离特性区内,刀-屑界面微通道消失,微织构主要功能为存储切削液。刀-屑界面应力分布系数对各特性区长度有影响,应力分布系数减小,近黏结区和微通道区长度增大,而近分离区长度相应减小。
The slipping zone characteristics occurring in the tool-chip interface play an important role in controlling the cutting fluid infiltration and tool-chip tribological characteristics and the quality of workpiece.The numerical model of the slipping zone in tool-chip interface was established for the reason of difficult to quantify the cutting fluid infiltration in the tool-chip interface and measure the sliding contact characteristics and micro-channel distribution.The sliding contact characteristics and micro-channel distribution and the mechanism of micro-texture in the tool surface were analyzed.The results show that there are three different types of macroscopic contact characteristics in slipping zone of the tool-chip interface,which are nearly bonding characteristic,micro-channel distribution characteristic and nearly separation characteristic.The mechanism of micro-texture in the tool rake face is to reduce the contact area because of no micro-channels in the nearly bonding zone,to connect the micro-channel because of the large quantity micro-channels in the micro-channels distribution zone,and to store the cutting fluid because of the disappearance of micro-channels in the nearly separation characteristic zone.The stress distribution coefficient of the tool-chip has an obvious effect on the length of each characteristic region.With the drcreasing of stress distribution coefficient,the contact length is increased in the nearly bonding zone and micro-channels distribution zone,and is decreased in the nearly separation characteristic zone.
作者
逄明华
申福猴
聂永芳
马利杰
PANG Minghua;SHEN Fuhou;NIE Yongfang;MA Lijie(School of Mechanical and Electrical Engineering,Henan Institute of Science and Technology,Xinxiang Henan 453003,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2019年第3期30-36,共7页
Lubrication Engineering
基金
国家自然科学基金项目(U1804142)
河南省科技攻关项目(192102210216)
关键词
微织构
刀-屑界面
滑移区
微通道
micro-texture
tool-chip interface
slipping zone
micro-channel
