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

• Applicant: Professor Dr.-Ing. Thomas Bergs, since 7/2019
• Subject Area: Metal-Cutting and Abrasive Manufacturing Engineering
• Term: from 2017 to 2020
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 350725742

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.

• DFG Programme: Research Grants
• Ehemaliger Antragsteller: Professor Dr.-Ing. Fritz Klocke, until 6/2019