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

刀具刃口的微观几何形状对刀具寿命有很大影响。通过工具的刷涂、研磨或激光烧蚀等准备过程，可以有针对性地设置这一点。制备工艺显著影响残余应力状态，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，有必要测量刀具刃口影响区的残余应力。由于测量范围很小，不可能用X射线方法来确定残余应力。拉曼显微镜是一种测量刀具刃口局部残余应力的方法。通过施加载荷应力对测量方法进行校准后，将通过打磨、激光烧蚀、刷削或电火花加工来制备PCD和PcBN刀具。利用拉曼显微镜测定了刀具的残余应力状态，并将刀具应用于AlSi10 Mg或100Cr6的车削试验，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，用于直接确定刀具刃口中的局部残余应力，并将其考虑到加工模拟中，以便更深入地了解PCD和PcBN刀具材料的磨损和失效机理。

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.