Influence of the grinding wheel topography on the formation of the thermo-mechanical stress collective in the grinding process

研究现状和自己的初步研究表明，目前主要缺乏关于体积砂轮组成和由此产生的砂轮地形对作用于工件表面的热机械应力集体形状的影响的知识。因此，关于砂轮的体积组成对工件边界区的影响的科学、定量的表述是不可能的。因此，需要用合格的参数对砂轮形貌进行详细和定量的描述，以确定砂轮体积成分与作用在工件边界区的热机械应力集中之间的关系。由于有限的测量方法和描述砂轮表面形貌的参数不足，限制了对砂轮表面进行必要的分析，本项目的目的是模拟砂轮表面形貌对表面磨削过程中作用于工件边界区域的热机械应力集中的影响。为此，建立了一个经验分析解释模型，该模型能够根据三维形貌参数来预测作用于工件边界区的热机械应力集中。首先，调整和构建了识别磨削过程中热机械应力集中所需的测量方法。为了找出必要的因果关系，有针对性地设计了不同的砂轮形貌，并进行了磨削实验。根据表面磨削过程中作用于工件边界区的表面形貌相关的热机械应力集体，首次探索了在砂轮与工件之间的接触区上高度溶解的应力集体。从砂轮的高度、材料比和三维形貌特征三个方面对使用过的砂轮进行了形貌分析。在探测到的与地形有关的热应力和机械应力分布与所获得的三维地形参数之间，导出了因果关系。基于这些关系，分别建立了三维形貌参数对热应力分布形式和机械应力分布影响的定量模型。在进一步的工作中，计划使用所开发的方法来确定附加砂轮规格(如金属结合剂砂轮或树脂结合剂砂轮)的工艺行为的相关性。综上所述，在这两个研究阶段都寻求了砂轮规格的接触区域与热机械应力集合的关系的定量模型。

The state of the research and own preliminary studies reveal, that currently a major lack of the knowledge about the influence of the volumetric grinding wheel composition and the resulting grinding wheel topography on the shape of the thermo-mechanical stress collective, acting on an workpiece surface, exists. So a scientific, quantitative statement about the influence of the volumetric composition of a grinding wheel on the boundary zone of a workpiece is not possible. Therefore a detailed and quantitative description of the grinding wheel topography by means of qualified parameters is required to identify the relationship between the volumetric grinding wheel composition and the thermo-mechanical stress collective acting on a workpiece boundary zone. Due to limited measurement methods and inadequate parameters for describing the topography, the necessary analysis of the grinding wheel surface is restricted.The aim of the project is to model the influence of the grinding wheel topography to the thermo-mechanical stress collective, which acts on the workpiece boundary zone during surface grinding processes. For this purpose, an empirical analytical explanation model is developed which enables the prediction of the thermo-mechanical stress collective acting on the workpiece boundary zone by depending on the three dimensional topography parameters. First, the necessary measuring methods for the identification of the thermo-mechanical stress collective during the grinding process are adapted and constructed. To detect the necessary cause-effect-relationships, different grinding wheel topographies are designed pointedly and grinding experiments are carried out. Following the topography-dependent thermo-mechanical stress collectives, which act on the workpiece boundary zone during a surface grinding process, are explored highly dissolved over the contact zone between grinding wheel and workpiece for the first time. The topographies of the used grinding wheels are analyzed regarding the height- , the material ratio- and the three-dimensional topography characteristics. Between the detected topography-dependent thermal and mechanical stress profiles and the obtained three-dimensional topography parameters cause-effect-relationships are derived. Based on these relationships respectively one quantitative model about the influence of the three dimensional topography parameters on the form of the thermal stress profile and the mechanical stress profile are derived.In further work it is planned to use the developed methodology to determine the dependence of the process behavior of additional grinding wheel specifications, like metallic- or resin bonded grinding wheels. In summary, a quantitative model for the contact zone resolved dependence of the thermo-mechanical stress collective of the grinding wheel specification is sought in both research periods.