Storchak Michael, Drewle Konstantin, Menze Christian, Stehle Thomas, Möhring Hans-Christian
Institute for Machine Tools, University of Stuttgart, Holzgartenstraße 17, 70174 Stuttgart, Germany.
Materials (Basel). 2022 May 2;15(9):3264. doi: 10.3390/ma15093264.
The thermomechanical interaction of the tool with the chip in the most loaded secondary cutting zone depends on the contact length of the tool rake face with the chip. Experimental studies of the dependency of the contact length on the cutting speed, the undeformed chip thickness, and the tool rake angle, performed by the optical method, are used for comparison with the contact length obtained by the FE modeling of the orthogonal cutting process. To determine the parameters of the constitutive Johnson-Cook equation, which serves as a material model of the FE cutting model that has a predominant influence on the contact length, a software-implemented algorithm was developed. This algorithm is based on determining the generalized parameters of the constitutive equation through finding the intersection of these parameter sets. The plurality intersection of the parameter sets of the constitutive equation is determined by means of the design of experiments and refined by subsequent multiple iterations. The comparison of the contact length values, obtained by simulating the cutting process using the generalized parameters of the constitutive equation as a material model with their experimental values, does not exceed 12% for a wide range of cutting speeds and depths of cut, as well as for the tool rake angle.
在负荷最大的二次切削区，刀具与切屑之间的热机械相互作用取决于刀具前刀面与切屑的接触长度。通过光学方法对接触长度与切削速度、未变形切屑厚度以及刀具前角之间的相关性进行的实验研究，用于与通过正交切削过程的有限元建模获得的接触长度进行比较。为了确定本构约翰逊 - 库克方程的参数，该方程作为对接触长度有主要影响的有限元切削模型的材料模型，开发了一种软件实现的算法。该算法基于通过找到这些参数集的交点来确定本构方程的广义参数。本构方程参数集的多个交点通过实验设计确定，并通过后续的多次迭代进行细化。对于广泛的切削速度、切削深度以及刀具前角范围，使用本构方程的广义参数作为材料模型模拟切削过程所获得的接触长度值与其实验值的比较，不超过12%。
