汽车同步器锥环孔隙分布模型与切削特性研究  

Research on the pore distribution modeling and cutting characteristics of the cone ring of car synchronizer

作　　者：张小粉[1] ZHANG Xiaofen(Department of Mechatronic Engineering(Technician),Xianyang Vocational Technical College,Xianyang 712000,China)

机构地区：[1]咸阳职业技术学院机电(技师)学院,陕西咸阳712000

出　　处：《粉末冶金工业》2022年第3期68-74,共7页Powder Metallurgy Industry

基　　金：2020年陕西省职教学会关于国家“双高计划”建设学校课程思政专项研究课题“《机械制图与计算机绘图》课程思政研究与实践”(SGKCSZ2020-1514);咸阳职业技术学院重点科研基金项目“粉末冶金用刀具寿命延长与质量一致性研究”(2021KJB02)。

摘　　要：汽车同步器锥环是典型的铁基粉末冶金零件,生产批量大,切削加工过程具有很多难题,其原因之一为粉末冶金零件内部有大量孔隙结构,导致切削过程中刀具在材料基体、孔隙、硬质颗粒间切入切出,产生间断载荷冲击,严重影响刀具寿命。本文就粉末冶金材料的多孔特性进行研究,选取粉末冶金材料密度与孔隙的对应关系进行建模,由密度推出该种材料的孔隙率,通过正态分布随机点模拟材料的孔隙分布规律,采用DEFORM3D切削仿真研究单孔、多孔材料切削过程中力、温度变化规律。计算结果表明:气孔引起的切削应力大幅波动,产生微冲击疲劳损伤;孔隙结构造成热量的堆积,加剧刀刃氧化磨损,是造成刀具快速磨损的关键因素。The auto synchronizer cone ring is a typical iron-based powder metallurgy part. It has large production batch and many difficulties in the cutting process with a lot of pore structures and hard particles inside the powder metallurgy parts. Intermittent load impact is produced in cutting procedure, which seriously affects the tool service life. In this paper, the porous characteristics of powder metallurgy materials are studied, the corresponding relationship between the density and pores of powder metallurgy materials is selected for modeling, the porosity of the material is deduced from the density, and the pore distribution law of the material is simulated by the normal distribution of random points. DEFORM 3D cutting simulation studies the changing laws of force and temperature during cutting of single-hole and porous materials. The calculation results show that the cutting stress caused by the pores fluctuates greatly, resulting in micro-impact fatigue damage;the pore structure causes the accumulation of heat and aggravates the oxidative wear of the cutting edge;it is the key factor that causes the rapid wear of the tool.

关 键 词：铁基粉末冶金 DEFORM 3D 车削刀具 孔隙 

分 类 号：U466[机械工程—车辆工程]