变速箱多向挤压铸造补缩位置和补缩力的研究

针对目前复杂铸件成形存在的缩松缩孔问题，以某铝合金摩托车变速箱为研究对象，利用专业铸造软件Procast 进行数值模拟。研究了铸件充型和凝固过程的温度场，预测了缩松缩孔的位置。模拟结果表明，缩松缩孔位置出现在气 缸孔处，因此将挤压头设置在该处进行锻压补缩。根据经验公式初步确定补缩力大小，然后对变速箱进行多向挤压铸造 模拟，最终确定补缩力大小。最后，根据优化的工艺参数开展试验研究，获得高品质铸件。

Study on Feeding Region and Force of Gearbox in Multidirectional Squeeze Casting

Aiming at solving the problem of shrinkage in complex squeeze casting, motorcycle gearbox was taken as the research object, and the numerical simulation was done with the professional casting analysis software procast. The temperature field of filling and solidification process was analyzed, and the region of shrinkage porosity was predicted. The results show that the shrinkage porosity occurs in the cylinder bore . therefore . the extrusion head can be arranged in the feeding region. According to the empirical formula. the feeding force was preliminarily determined. and then the numerical simulation of motorcycle gearbox was made to determine the feeding force eventually. With the optimum technological parameters. the experiment was carried out to achieve high quality casting.