Auswirkungen thermomechanischer Vorgänge beim Werkzeugschleifen

(Effects of thermomechanical processes during tool grinding)

Schneider, M.

In modern production processes like dry cutting or high speed machining cutting tools are exposed to high thermal, mechanical and chemical stress. A tool has to guarantee high productivity. Only high quality tools can meet these requirements. Due to the fact that cutting tools are typically manufactured by grinding, this process is of special interest.

This thesis deals with the topic of thermic stress of tools during grinding. It is demonstrated what effects stress can have on the process behavior and the wear of cutting tools during their application. Cutting material like cemented carbide or cermet are in the focus of the discussions.

The analyses show that the thermic stress during grinding has a significant influence on the wear and process behavior of a tool. In order to rate the thermal stress, the tool behavior was simulated by means of finite element simulations. The grinding process was modelled for indexable cemented carbide or cermet inserts. Simulations were also made for grinding of twist drills.

In order to develop a model for tool grinding, process depending thermal distribution factors as well as mechanical stress profiles of the contact zone are determined. The finite element simulation shows significant dependencies between the thermal and mechanical stress and changes in the sub surface zone of the cutting tool. Strategies for grinding of cemented carbide or cermet cutting tools regarding minimal thermal stress are proposed. It is shown that the finite element method is an appropriate tool for computer aided process design of tool grinding.

Published as

Dissertation, Universität Dortmund, Vulkan Verlag, Essen, 1999, ISBN 3-8027-8708-0