Abstract
The efficiency of forming and moulding processes highly depends on the surface quality of the manufactured tools, dies and moulds. The capability of these tools is significantly defined by the tooling material, the geometrical precision and the integrity of the sub-surface. Machining of hot working steels in their hardened state is a major challenge for multi-axis hard milling processes in the tooling sector. In this study the machining and the related impact to the generated sub-surface was investigated. The most utilized hot working steels, especially in the field of die casting, 1,2343, 1,2344, 1,2367 and 1,2340 were considered. It was observed that mainly by choosing appropriate cutting parameters, ploughing-related sub-surface deformation as well as cutting, tearing and deformation of the microstructure and local machining-related sub-surface hardness-increase can be significantly decreased in contrast of choosing “worst case” scenarios in terms of centre milling and milling with worn milling tools.
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