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本文根据试验观察,提出了刀具刃口带有负倒棱时的切削模型。在这个模型中,刀具刃口存在一个金属死区。以新模型为基础。对切削过程中刀具刃口处消耗的能量进行了理论分析与公式推导,并根据最小能量原理对重要参数——剪切角进行了理论计算。所作工作的特点是:在能量分析中计入了被挤压层金属通过刀具刃口时消耗的过剩变形能;进行有关材料变形与物理特性的计算时,考虑了温度与应变率的影响。利用新研制的在线显微摄影装置进行验证试验的结果表明,理论计算与实际取得了很好的一致。
According to the experimental observation, this paper presents a cutting model with negative chamfer on the tool edge. In this model, there is a metal dead zone at the cutting edge of the tool. Based on the new model. Theoretical analysis and formula derivation of the energy consumed at cutting edge of cutting tool are carried out, and the important parameter-shear angle is calculated theoretically according to the principle of minimum energy. The work done is characterized by the fact that the residual deformation energy consumed by the extruded layer of metal passing through the cutting edge is taken into account in the energy analysis and the effects of temperature and strain rate are taken into account in the calculation of the deformation and physical properties of the material. The results of the verification test using the newly developed on-line micro-photography device show that the theoretical calculation is in good agreement with the actual one.