Characterization and simulation of the fracture behavior of CBN grain types as a function of crystal structure, grain orientation and dressing parameters

CBN 晶粒类型断裂行为随晶体结构、晶粒取向和修整参数变化的表征和模拟

基本信息

批准号：
391202973
负责人：
Professor Dr.-Ing. Thomas Bergs, since 7/2019
金额：
--
依托单位：
Werkzeugmaschinenlabor - WZL
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 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/391202973?language=en
关键词：
Characterization simulation fracture behavior CBN

项目摘要

The grinding process is at the end of a multitude of value-added chains and contributes decisively to the application behavior of components. During the grinding process, the edge zone of these components is influenced by a thermo-mechanical and material-metallurgical stress collective. This determines the components edge zone properties. These properties depend on the contact conditions between the grinding wheel and the workpiece acting in the grinding process. A change in the grinding tools topography therefore has a significant influence on the load collective and thus on the grinding process result. In order to predict topographies, recently developed mathematical-generic grinding tool models exist that depict the spatial arrangement of the components grains, binding and pores in a realistic manner as a function of the volumetric composition of a grinding tool. With the aid of this software-based model, grinding wheel topography will be predicted in the future without having to measure the grinding wheel topographies. Out of this, software-based models allow a prediction of the kinematic contact conditions between the grinding wheel and the workpiece, which determine the application behavior as well as the process result. The kinematic contact ratios depend to a large extent on the used breaking behavior of the grain material. However, the fracture behavior of commercially highly relevant grain materials, such as the cubic boron nitride (CBN), is investigated insufficiently.Therefore, the aim of the present research project is an explanation model for the characterization of the fracture behavior of CBN grain materials taking into account the crystal shape of the grain type, the crystal orientation and the dressing parameters.To this end, a method for the quantitative analysis and description of the fracture behavior of CBN grain materials is developed first. Furthermore, the fracture mechanisms of CBN grain materials are investigated in a single-grain dressing process as a function of the crystal shape and the dressing parameters. Based on the findings of the empirical investigations, a numerical modeling of the stresses during the dressing process in CBN grains is carried out and a transfer of the findings to the existing software-based models for the simulation of the grinding tool topography is done. In the future the empirical findings and simulation results are used to simulate grinding processes depending on the specification of the used grinding tool. This offers the potential to substitute cost-intensive empirical series of experiments by simulations, and thus to determine the effects of the resulting grain-breakage-dependent grinding wheel topography on the process behavior as a function of the volumetric composition of the grinding wheel and the dressing process.

研磨过程是在众多增值链的末尾，对组件的应用行为做出了决定性的贡献。在研磨过程中，这些组件的边缘区域受热机械和材料 - 金属应力集体的影响。这确定了组件边缘区域属性。这些特性取决于磨轮和作业在研磨过程中作用的接触条件。因此，磨削工具地形的变化对负载集体以及磨削过程的结果产生了重大影响。为了预测地形，存在最近开发的数学形式研磨工具模型，它以逼真的方式描绘了成分晶粒，结合和孔的空间布置，这是磨削工具的体积组成的函数。借助此基于软件的模型，将来将预测磨轮的地形，而无需测量磨轮的地形。在此之后，基于软件的模型可以预测磨轮和工件之间的运动学接触条件，从而确定应用程序行为以及过程结果。运动接触比在很大程度上取决于晶粒材料的使用破坏行为。 However, the fracture behavior of commercially highly relevant grain materials, such as the cubic boron nitride (CBN), is investigated insufficiently.Therefore, the aim of the present research project is an explanation model for the characterization of the fracture behavior of CBN grain materials taking into account the crystal shape of the grain type, the crystal orientation and the dressing parameters.To this end, a method for the quantitative analysis and description of the首先开发了CBN谷物材料的断裂行为。此外，在单粒敷料过程中研究了CBN晶粒材料的断裂机制，该过程是晶体形状和敷料参数的函数。根据实证研究的发现，进行了CBN谷物在敷料过程中应力的数值建模，并将发现转移到现有的基于软件的模型中，以模拟研磨工具地形。将来，经验发现和仿真结果用于根据所使用的磨削工具的规范来模拟研磨过程。这提供了通过模拟替代成本密集的经验实验实验的潜力，从而确定所得的谷物依赖性磨削轮形对过程行为的影响，这是磨削轮的体积组成和调味料过程的函数。