硬态切削工件表面白层厚度预测方法  

Prediction Method of the White Layer Thickness in Hard Cutting

作　　者：徐颖强[1] 李娜娜[1] 李万钟[1] 郭彩虹[1] 

机构地区：[1]西北工业大学机电学院,西安710072

出　　处：《机械工程学报》2015年第3期182-189,共8页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(50875214;11072196)

摘　　要：硬态切削过程中产生了高的机械载荷和热载荷,工件表面易产生白层组织,研究硬态切削工件表面白层的形成机理并对白层厚度进行建模预测,对于改善硬态切削加工技术具有指导意义。以探究白层形成机理为研究目标,综合运用弹塑性力学、热力学和材料相变理论,建立热力耦合的硬态切削模型,模拟了硬态切削过程中的温度场和应力场,分析了工件表面白层形成的组织转变过程,以热力影响下的材料相变温度作为白层形成的判据,建立了白层厚度的预测方法,并以轴承钢GCr15为研究对象,预测了不同切削参数下白层的厚度,对预测结果加以对比验证。研究结果表明:对于硬态切削工件表面白层的形成,基于相变理论的白层厚度预测方法是可行的。The high mechanical-heat load is generated in hard cutting, so white layers is produced on the work-piece surface, the study of the white layer formation mechanism and the prediction of white layer thickness have an important theoretical guidance significance in developing the hard cutting technology. In order to research the white layer formation mechanism, the thermal-mechanical coupling cutting simulation model is established based on the elastic-plastic mechanics, thermodynamics and material phase transition, the temperature field and stress field is simulated in cutting process, the organization transformation process of the work-piece surface is analyzed, the phase transformation temperature affected by thermal and mechanical in hard cutting is used to estimate white layer, Taking bearing steel GCr15 as the object, white layer thickness under the different cutting parameters is predicted, and the prediction method is validated. The results as following, for white layers produced on the work-piece surface in hard cutting, the predicting method based on the phase transformation theory is feasible.

关 键 词：硬态切削 白层 热力耦合 温度场 应力场 

分 类 号：TH161[机械工程—机械制造及自动化]