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Effects of cutting edge residual stresses on the wear behavior of PVD-coated cutting tools

切削刃残余应力对PVD涂层刀具磨损行为的影响

基本信息

批准号：
389013280
负责人：
Professor Dr. Harald Behrens
金额：
--
依托单位：
Institut für Mineralogie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/389013280?language=en
关键词：
Effects cutting edge residual stresses

项目摘要

Cutting tools have successfully been coated with thin hard layers in order to improve their wear and thermal properties for longer tool life. Apart from composition and layer structure (single, combined, multi layer), the process related residual stresses have the most important effects on resulting tool properties. An in-process variation of the coating conditions enables a specific adjustment of residual stress depth distributions in coating and coating-substrate-compound, resp., for an improved tool behaviour. Particular attention is paid to the highly curved surface directly in the cutting edge, as here frequently wear initiation takes place. In this tool range process related different deposition conditions prevail than on flat surfaces. An experimental determination of residual stresses directly in the cutting edge is not possible with the so far applied methods. Raman spectroscopy offers the potential, in a combination with X-ray diffractometric methods, to be applied for the necessary locally resolved measurements. The first part of this project deals with the preparation of the Raman method for residual stress measurement at common (Ti,Al)N coatings. In the second part targetedly relations between cutting edge residual stresses and wear behavior of the tools will be analyzed. The goal of this project will be reached, when the causes of wear initiation have been understood and recommendations for a design of cutting edge residual stresses can be given.

刀具已成功地涂上薄硬层，以改善其磨损和热性能，延长刀具寿命。除了成分和层结构（单层、复合、多层）外，与工艺相关的残余应力对所得到的刀具性能有最重要的影响。过程中涂层条件的变化可以对涂层和涂层-基材-化合物中的残余应力深度分布进行特定的调整，例如。，以改善工具的性能。特别要注意的是直接在切削刃的高度弯曲的表面，因为这里经常发生磨损。在该工具范围内，与平面相比，相关的不同沉积条件更为普遍。在实验中直接测定切削刃的残余应力是不可能的，用目前应用的方法。拉曼光谱与x射线衍射方法相结合，提供了应用于必要的局部分辨率测量的潜力。本课题的第一部分是用拉曼法测量普通（Ti,Al）N涂层的残余应力。第二部分将有针对性地分析切削刃残余应力与刀具磨损性能之间的关系。当了解了引起磨损的原因并给出了切削刃残余应力的设计建议时，这个项目的目标就会实现。