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Quality and Performance Improvement for Precision Machining by Means of Locally Adapted Cutting Edge Microshapes by a Specific Pre- and Post-Treatment for Coated Reaming Tools

Tool preparation before and after coating makes it possible to significantly increase the performance of VHM cutting tools. However, the after-treatment of the coating may cause local delamination of the coating. This influence is mainly observed in cutting areas with small roundings, where the coating cannot adhere optimally. Therefore, there still is a considerable need for research in the field of tool preparation for tools for fine boring machining, which, due to technological reasons, require cutting with a slight edge rounding.

This is to be countered in the planned research project using the example of the multi-bladed reamer. With reaming tools, the minor cutting edge must produce a very high surface quality and should therefore have a slight edge rounding. The major cutting edge, on the other hand, cuts the majority of the material and thus requires a high degree of stability, which is achieved by applying a larger rounding. Within the research project, the different requirements for the major and minor cutting edges are to be met by the development of a cutting edge microstructure locally adapted to the cutting process through appropriate layer pre-treatment and post-treatment. In the first step, the design of the edge shape at the major and minor cutting edge is carried out with regard to the average cutting edge rounding and the form-factor, taking into account the existing meshing conditions. Based on this, the coating and, in particular, the layer post-treatment are optimised to the requirements of the edge shape produced. The possibility of sharpening the cutting edge after coating by laser is also analysed here. The aim is to achieve an increase in tool life while maintaining or improving bore quality through locally adapted cutting edge micro shape, so that tool manufacturers and users alike benefit from the research results.

Engagement situation and wear types of a multi-bladed reamer and problem areas during coating and post-treatment of sharp cutting edges


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