Influence of preparation-induced residual stresses in the cutting edge of cutting tools on the wear behavior of extremely hard cutting materials

切削刃微观几何形状对刀具寿命有重要影响。通过诸如工具的刷、研磨或激光烧蚀等制备工艺，可以以有针对性的方式进行设置。制备工艺显著影响残余应力状况，从而影响刀具寿命。为了了解制备工艺对残余应力状态的影响，需要对切削刃影响区域进行残余应力测量。由于测量范围很小，使用x射线方法无法确定残余应力。拉曼显微镜是一种测量切削刃局部残余应力的方法。通过施加负载应力校准测量方法后，将通过研磨、激光烧蚀、电刷或电火花加工制备PCD和PcBN工具。然后利用拉曼显微镜测定残余应力状态，并将刀具与AlSi10Mg或100Cr6进行车削实验，以确定残余应力对刀具寿命的影响。该项目的独创性在于建立了一种测量方法，用于直接确定切削刃的局部残余应力，并在加工模拟中考虑它们，以便更深入地了解切削材料PCD和PcBN的磨损和失效机制。

The cutting edge microgeometry has a significant influence on tool life. By preparation processes such as brushing, grinding or laser ablation of tools, this can be set in a targeted manner. The preparation processes significantly influences the residual stress condition and thus the tool life. In order to understand the influence of the preparation processes on the residual stress state, residual stress measurements in the influenced area of the cutting edge are necessary. Due to the very small measuring range, it is not possible to determine the residual stresses using X-ray methods. Raman microscopy is a method which offers measuring residual stresses locally in the cutting edge. After calibration of the measuring method by applying load stresses, PCD and PcBN tools will be prepared by grinding, laser ablation, brushing or EDM. The residual stress state is then determined using Raman microscopy and the tools are applied in turning experiments with AlSi10Mg or 100Cr6 to determine the influence of the residual stresses on tool life. The originality of the project is characterised by the establishment of a measuring method for the determination of local residual stresses directly in the cutting edge and their consideration in a machining simulation in order to obtain a deeper understanding of wear and failure mechanisms in the cutting materials PCD and PcBN.