摩托车铝合金缸体压铸工艺参数优化

摘要

In order to solve the defects problem of aluminum alloy cylinder body casting for motorcycle, the effects of fast shot velocity, fast shot set point and mold temperature on the porosity area ( shrinkage cavity, shrinkage porosity and air hole ) of aluminum alloy cylinder body casting for motorcycle were systematically investigated using orthogonal experiment method and theoretical simulation in which AnyCasting numerical simulation software and ImageJ statistics software were exploited. The results indicate that the total porosity area of the casing increases with the increasing of the fast shot velocity,while decreases with the rising of fast shot set point and mold temperature. The optimal parameters are: fast shot velocity-2. 0 m/s, fast shot set point-280 mm and mold temperature-240℃. Using this set of the optimal parameters, the casting density was increased , the percentages of porosity area on the top surface and bottom surface of the casting were decreased about 21% and 68% ,respectively, and the casting scrap rate was reduced from 14% to 5%.%为解决摩托车铝合金缸体压铸件存在的缺陷问题，利用AnyCasting铸造数值模拟分析软件，采用正交试验方法，并借助ImageJ软件统计铸件的孔洞面积（缩孔缩松或气孔），系统研究了压铸工艺参数：快压射速度、快压射切换点位置及模具温度对摩托车铝合金缸体孔洞面积的影响规律．研究表明，铸件内的孔洞总面积随着快压射速度的增加而增加，随着快压射切换点位置和模具预热温度的增加而减小．本实验条件下的最优工艺参数为：快压射速度2．0 m／s、快压射切换位置280 mm、模具温度240℃．采用该组参数，使铸件致密度增大，上、下端面孔洞所占面积分别减少21％和68％，铸件废品率从14％降低到5％．