钼金属径向精锻工艺的数值模拟

Numerical Simulation of Radial Precision Forging Technology for Metal Molybdenum

摘要:

通过热压缩试验研究钼金属在应变速率为0.01~10 s-1，变形温度为900~1450 ℃条件下的热变形性能，建立了基于流变应力的钼金属热变形的本构方程。应用有限元分析软件DEFORM中的COGGING模块对钼金属棒材的径向精锻过程进行模拟，确定合理的工艺参数，并对模拟结果进行分析。结果表明：本研究提出的用于模拟结果分析的锻透性判据合理，工艺过程和参数的确定方法正确。研究表明：影响锻透性的主要因素为道次压入量和锤头倾角；影响锻件表面质量的主要因素为轴向送进速度和旋转角度。

Abstract:

Hot workability of metal molybdenum was investigated by means of hot compression tests carried out in the temperature range of 900~1450 ℃ and strain rate range of 0.01~10 s-1. A constitutive equation of molybdenum for the flow stress was presented. The radial precision forging process of the molybdenum bar was simulated by COGGING modular of FEM software DEFORM. Reasonable process parameters were determined, and the forging penetration efficiency was explored from the strain-effective state. The results show that the forging penetration efficiency criterion put forward for the simulation result analysis is reasonable. Determination methods of the process and parameters are correct. Research shows that the main factors influencing forging penetration efficiency are reduction in pass and the dip angle of the hammer, and the main factors influencing forged piece surface quality are axle feeding speed and rotation angle.