航空铝合金高速铣削锯齿形切屑形成有限元模拟

Finite Element Simulation of Sawtooth Chip Formation for High-speed Milling of Aviation Aluminum Alloy

高强度铝合金高速铣削形成的锯齿形切屑,严重影响加工稳定性和零件表面质量。采用Johnson-Cook本构方程及损伤准则,选用合适的沙漏控制模型,对航空铝合金7075-T651高速切削过程中锯齿形切屑的形成进行了模拟,并经文献中高速切削试验数据验证了所提出的有限元模型。结果表明,在2m/s^20m/s的切削速度范围内,锯齿形切屑形貌得到了准确的预测。

Sawtooth chips are formed in high speed cutting process of high strength aluminum alloy, which seriously affect the processing stability and surface quality of parts. Johnson-Cook constitutive equation and damage criterion are used with the suitable hourglass control model to simulate the formation of the sawtooth chip in high-speed cutting process of aviation aluminum alloy 7075-T651. The finite element model is verified by high speed cutting experiment data from the literature. The results show that the sawtooth chip morphology is accurately predicted within the cutting speed range of 2 m/s^20 m/s.