Fundamental Investigations on the frictional contact in the working zone in machining processes

加工过程中工作区摩擦接触的基础研究

基本信息

批准号：
404632185
负责人：
Professor Dr.-Ing. Dirk Biermann
金额：
--
依托单位：
Institut für Spanende Fertigung
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/404632185?language=en
关键词：
Fundamental Investigations frictional contact working

项目摘要

Machining processes are majorly influenced by frictional events in the contact area of the tool and the workpiece. The working zone is characterized by high deformation rates, contact pressures and temperatures. Therefore, the friction conditions of the chip formation process distinguish significantly from established friction tests. In this project the analysis of friction is supposed to be carried out under the terms of machining conditions with respect to mechanisms and their interactions as well as influences by process parameters. A special test setup that enables testing conditions similar to machining conditions is used for the investigation. In this test the workpiece is moved relatively to the tool so that the workpiece is plastically deformed. Both objects are made of materials commonly used for machining processes. The sliding velocity, the surface topology and the temperature determine the frictional contact and are investigated in this project. The test setup provides the ability to reach different temperatures at the same sliding velocity. Therefore, this setup superior to methods like the pin-on-disc-test.Another goal of this project is to achieve an improved and realistic friction model for the simulation of chip formation. Finite-Element-simulations of the chip formation made great progress over the last decade. In order to obtain realistic simulation results proper input data for the material and frictional behavior is needed. Especially the cutting normal force depends on the friction between the chip and the rake face and is often miscalculated in FE-simulations. Therefore, this project should provide a proper friction model to improve the simulation of process forces.

加工过程主要受工具接触区和工件接触区域中的摩擦事件的影响。工作区的特征是高变形率，接触压力和温度。因此，芯片形成过程的摩擦条件与已建立的摩擦测试显着区别。在该项目中，应该根据机制及其相互作用的加工条件的术语进行摩擦分析以及通过过程参数的影响。调查使用类似于加工条件的测试条件的特殊测试设置。在此测试中，工件相对移动到工具，以使工件塑料变形。这两个对象均由通常用于加工过程的材料制成。滑动速度，表面拓扑和温度决定了摩擦接触，并在该项目中进行了研究。测试设置提供了在相同的滑动速度下达到不同温度的能力。因此，这种设置优于诸如PIN-DISC测试之类的方法。该项目的另一个目标是实现改进且逼真的摩擦模型，以模拟芯片形成。在过去的十年中，芯片组的有限元模拟取得了长足的进步。为了获得现实的仿真结果，需要适当的材料输入数据和摩擦行为。尤其是切割的法向力取决于芯片和耙子面之间的摩擦，并且在Fe模拟中经常被错误计算。因此，该项目应提供适当的摩擦模型，以改善过程力的模拟。