Thermomechanical interaction in the shear cutting affected zone

剪切影响区的热机械相互作用

基本信息

批准号：
360148869
负责人：
Professor Dr.-Ing. Wolfram Volk
金额：
--
依托单位：
Lehrstuhl für Umformtechnik und Gießereiwesen
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/360148869?language=en
关键词：
Thermomechanical interaction shear cutting affected

项目摘要

Shear cutting is an important process in chipless separation of metallic materials. In terms of quality assessment the formation of the cutting surface is important. Many present investigations deal with the influence of different process parameters, e.g. cutting edge geometry, cutting speed and clearance, on the formation of the cutting surface. Material failure occurs when the shear fracture limit is reached, which depends on the deformation and the stress state. Thereby, material behav-ior is decisively determined by strain, strain rate and temperature. This variables interact in the shear cutting affected zone during the cutting process. An overall analysis of this complex cause-effect relationships is not possible until now.Hence, the scope of this research is to develop a measurement setup and evaluation methodology enabling a synchronous analysis of strain, strain rate and temperature in the shear zone. The mate-rial behavior is evaluated by measuring the process variables having regard to the three process parameters cutting clearance, cutting edge geometries and cutting speed. For this a shear cutting tool is built up which allows an in-situ high resolution detection of local strains, strain rate and tem-perature of the material in the cutting affected zone for the first time having regard to the punch speed and the punch penetration. The interpretation of the measurement data in combination with an integrated cutting-force-displacement-measurement enables an extended description of the material behavior during shear cutting process until crack initiation. Based on that, specifications on how to acquire a parameter set for shear cutting finite element analysis are derived. The devel-opment and testing of the measurement setup and evaluation methodology is an important mile-stone and the basis for the development of a meta model for the prediction of cutting surface-formation.

切割切割是金属材料无芯片分离的重要过程。在质量评估方面，切割表面的形成很重要。许多研究涉及不同过程参数的影响，例如切割表面形成的尖端几何形状，切割速度和间隙。当达到剪切断裂极限时，发生材料故障，这取决于变形和应力状态。因此，材料行为由应变，应变速率和温度决定性地确定。在切割过程中，该变量在切割切割影响区中相互作用。直到现在，对这种复杂的因果关系的总体分析是不可能的。因此，这项研究的范围是开发一种测量设置和评估方法，从而实现了对剪切区的应变，应变率和温度的同步分析。通过测量三个过程参数削减间隙，尖端几何形状和切割速度的过程变量来评估Mate-Rial行为。为此，建立了剪切切割工具，该工具允许对局部应变，应变速率和切割受影响区域中材料的温度进行高分辨率检测，这是对冲压速度和打孔器穿透而首次进行。对测量数据的解释与综合切割 - 置换测量相结合，可以扩展对剪切切割过程中材料行为的扩展描述，直到裂纹开始。基于此，得出了有关如何获取用于切割有限元分析的参数集的规格。测量设置和评估方法的开发和测试是重要的英里石，也是开发用于预测切割表面形成的元模型的基础。