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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.

加工过程主要受刀具和工件接触区域中的摩擦事件的影响。工作区的特点是高变形率、接触压力和温度。因此，切屑形成过程的摩擦条件与已建立的摩擦试验有很大区别。在这个项目中，摩擦分析应该在加工条件下进行，这些条件与机制及其相互作用以及工艺参数的影响有关。一个特殊的测试设置，使测试条件类似的加工条件是用于调查。在该测试中，工件相对于工具移动，使得工件塑性变形。这两个物体都是由通常用于加工过程的材料制成的。滑动速度，表面拓扑结构和温度决定了摩擦接触，并在本项目中进行了研究。测试装置提供了在相同滑动速度下达到不同温度的能力。因此，这种设置优于上级的方法，如销盘测试。本项目的另一个目标是实现一个改进的和现实的摩擦模型，用于模拟切屑形成。切屑形成的有限元模拟在过去的十年中取得了很大的进展。为了获得真实的模拟结果，需要适当的材料和摩擦行为的输入数据。特别是切削法向力取决于切屑和前刀面之间的摩擦，并且在有限元模拟中经常被错误计算。因此，本计画应提供适当的摩擦模型，以改善制程力的模拟。