基于近似因子分解法的挤压铸造充型过程数值模拟

Numerical Simulation on Squeeze Casting Mold Filling Process Based on Approximate Factorization Scheme

充型过程数值模拟有助于了解型腔内金属液的流动形态。SOLA法是目前求解速度场和压力场最流行的方法之一,但SOLA法在求解速度场和压力场的过程中,需在动量方程和连续性方程之间进行反复迭代,计算效率低。本文采用近似因子分解法进行速度场和压力场的计算,根据挤压铸造的特点,考虑冲头的运动,建立基于有限差分法的流动场数值模拟程序,从而实现了对挤压铸造充型过程的数值模拟。为验证程序的正确性,对纯铝实验件挤压铸造充型过程进行了模拟计算,模拟结果与中国兵器科学研究院宁波分院齐丕骧研究员关于冲头速度控制的论述一致。

To simulate the flow patterns of squeeze casting mold filling process, the SOLA method is often used for calculating the velocity fields and pressure in filling simulation. Because repeated iteration, the computational efficiency is low. The approximate factorization scheme is applied in numerical solution of the velocity fields and the pressure. The finite difference program is established to calculate filling process considering punch movement. By simulating filling process of pure aluminium squeeze casting, it is proved that this program based on approximate factorization scheme and punch movement is correct by the research result that is proposed by Professor QI Pixiang.