FM法锻造的模拟研究

A SIMULATION OF THE FM FORGING PROCESS

本文利用激光云纹技术模拟了砧宽比(2W/H_0)为0.4、0.6、0.8时的平面FM法锻造过程。采用按云纹图修正理论滑移线场的方法,提出了更接近实际的FM法滑移线场。从修正的滑移线场和云纹图分别得到了变形区静水压应力和等效应变分布,并与普通锻造法的结果进行了比较。结果表明,两种锻造方法在锻件心部产生的最大等效应变相差不大,但EM法产生较大的静水压应力,对消除锻件内部孔洞型缺陷有利。

By using the optical spatial technique, the Fm forging process under plane strain condition is studied at ratio 2w/Hc=0.4, 0.6 and 0.8, where 2w is the anvil width and Hc is the height of workpiece. Based on corresponding Moire fringe patterns, using the approach to correct the theoretical slip line field, a more practical slip line field suitable for FM forging process is presented in the paper. Distributions of hydrostatic pressure and effective strain are derived from the corrected slip line field and the Moire fringe patterns respectively. The results obtained are compared with those of conventional process. It is shown that the maximum effective strains in the cores of the workpieces forged by the two processes are almost the same, but a much higher hydrostatic pressure produced by the FM process is achieved. Consequently, the FM process is able to eliminate the cavity-type defects in the core of forgings more effectively.