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In situ strain measurement in metal cutting with geometrically defined cutting edge

使用几何定义的切削刃进行金属切削中的原位应变测量

基本信息

批准号：
185778203
负责人：
Professor Dr. Walter Reimers
金额：
--
依托单位：
Fachgebiet Werkzeugmaschinen und Fertigungstechnik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/185778203?language=en
关键词：
situ strain measurement metal cutting

项目摘要

The machining process with geometrically defined cutting edge is characterized by a highly complex chip formation process. A number of models have been developed which describe the material flow during chip formation. These models can be used for the calculation of mechanical and thermal state variables in the chip formation zone, such as strain, stress and temperature. However, the chip formation models rely on several simplifying assumptions due to the circumstance that the cutting process is difficult to monitor. The subject of the first project period was the in situ measurement of the state of stress within the chip formation zone during the cutting process by means of high-energy synchrotron X-radiation. The influence of different cutting parameters on the stress state was to be determined. The findings contribute to the verification and extension of existing chip formation models. Further influencing variables on the stress state shall be considered in the second project period. These variables are the formation of built up edge, a multiphase material as well as microstructural changes in the material. Material parameters for the microstructural changes shall be determined by means of ECAP experiments (Equal Channel Angular Pressing) and shall be implemented in a cutting simulation model. The microstructural material properties will subsequently be varied in the cutting simulations. Their influence on the stress state can thereby be investigated.

具有几何限定的切削刃的加工过程的特征在于高度复杂的切屑形成过程。已经开发了许多模型来描述切屑形成过程中的材料流动。这些模型可用于计算切屑形成区的力学和热状态变量，如应变、应力和温度。然而，切屑形成模型依赖于几个简化的假设，由于切削过程是难以监测的情况下。第一个项目期的主题是利用高能同步加速器X射线对切削过程中切屑形成区内的应力状态进行现场测量。确定了不同切削参数对应力状态的影响。研究结果有助于验证和扩展现有的切屑形成模型。应在第二个项目期间考虑应力状态的其他影响变量。这些变量是堆积边缘的形成、多相材料以及材料中的微观结构变化。微观结构变化的材料参数应通过ECAP实验（等通道转角挤压）确定，并应在切削模拟模型中实施。随后将在切削模拟中改变微观结构材料特性。由此可以研究它们对应力状态的影响。