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.

切削刀具已成功地涂有薄硬层，以改善其磨损和热性能，从而延长刀具寿命。除了成分和层结构（单层、组合、多层）之外，与工艺相关的残余应力对最终的工具性能具有最重要的影响。涂层条件的过程中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具体调整，从而改善工具性能。特别要注意直接位于切削刃中的高度弯曲表面，因为这里经常发生磨损。在该工具系列工艺中，与平坦表面相比，相关的沉积条件不同。使用迄今为止所应用的方法，不可能直接通过实验确定切削刃中的残余应力。拉曼光谱与 X 射线衍射方法相结合，可用于必要的局部分辨测量。该项目的第一部分涉及用于普通 (Ti,Al)N 涂层残余应力测量的拉曼方法的准备。第二部分将有针对性地分析切削刃残余应力与刀具磨损行为之间的关系。当了解磨损产生的原因并给出切削刃残余应力设计的建议时，该项目的目标就可以实现。