气门毛坯终锻成形过程的理论分析

Theoretic Analysis of the Finish-Forging Process of the Engine Valve

运用有限元软件MAFAP ,对气门毛坯的终锻成形过程进行数值模拟分析 ,获得了金属在模具型腔内填充时的速度场、应变场分布以及模具受力等信息 ,并研究得到终锻成形的金属变形机理。由于变形不均匀 ,可能导致毛坯法兰边缘产生周向裂纹 ,在凹模圆角部位 ,由于承受大的正压力和摩擦力等原因 ,从而加快凹模开裂和表面拉伤的速度 。

The finite_element software MAFAP was used to make simulation analysis on the finish_forging process of the engine valve. Information about the metal flow rate, strain distribution and stress on the die while the metal was being filled into the die cavity was obtained. The metal deformation mechanism in the finish_forging process was studied. Uneven deformation might cause peripheral crack at the flange edge. And because of great positive press and friction exerted on the fillet area of the die, the die cracking and surface drawing would be speeded up and the die life would be shortened.