超声振动辅助缓进给磨削温度场仿真与试验分析  

Simulation and Experimental Analysis of Ultrasonic Vibration Assisted Creep Feed Grinding Temperature Field

作　　者：李厦[1] 王锴霖 LI Sha;WANG Kai-lin(University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学,上海200093

出　　处：《表面技术》2018年第7期265-269,共5页Surface Technology

摘　　要：目的通过对比研究磨削过程中超声振动辅助缓进给磨削工件表面的温度变化,验证超声振动对磨削热的影响,为进一步研究磨削机理提供依据。方法基于磨削温度场解析模型,建立了磨削热源平均强度。运用ANSYS软件热分析模块分别对普通缓进给磨削和超声辅助缓进给磨削进行了工件表面温度场仿真,得到了不同载荷步的温度场分布以及工件表面的温度时间变化曲线,较准确地反映了磨削工件时工件表面的温度变化。结果试验和模拟表明,缓进给磨削工件时,工件表面温度较高,对工件施加超声振动后,能够有效降低磨削力,减少磨削过程中产生的热量,降低工件表面温度20%左右。结论超声振动辅助磨削工件时,由于工件高频振动导致磨粒与工件间断性接触,使磨削过程变为有规律的脉冲状断续磨削,有利于工件散热,降低了磨削温度,为避免缓进给磨削时容易出现的磨削烧伤现象提供了技术支持。The work aims to verify the effects of ultrasonic vibration on grinding heat and provide basis for further studying grinding mechanism by comparatively studying temperature change of grinding workpiece surface due to ultrasonic vibration assisted creep feed in grinding process.Based on analytical model of grinding temperature field,average strength of grinding heat sourcewas established.Surface temperature field of workpiece was simulated for common creep feed grinding and ultrasonic assisted creep feed grinding,respectively by using ANSYS thermal analysis module.Temperature field distribution and temperature-time curve of workpiece surface were obtained in different load step,which accurately reflected temperature change of workpiece surface.The experiments and simulation showed that the workpiece surface temperature of creep feed grinding was higher during creep feed of grinding workpiece.Ultrasonic vibration could effectively reduce grinding force,reduce heat generated during grinding,and reduce the surface temperature of workpiece by about 20%.In case of ultrasonic vibration-assisted grinding workpiece,abrasive grain contacts workpiece discontinuously due to high-frequency vibration of workpiece,hence the grinding process becomes orderly pulsed intermittent grinding,which facilitates workpiece radiation,reduces grinding temperature,and provides technical support for avoiding grinding burn phenomenon which may easily occur during.

关 键 词：超声振动 缓进给磨削 温度场 热源模型 热源强度 有限元仿真 

分 类 号：TG580.6[金属学及工艺—金属切削加工及机床]