由于各地摩托车生产大量增加,对250曲轴箱的需求量也越来越大。原工艺为砂箱造型和低压铸造,生产周期长,且外表面较粗糙,我厂改用压铸工艺制造曲轴箱,已获得成功。由于零件造型复杂,壁厚从12.5毫米到18毫米厚薄相差悬殊,且要求在4kgf/cm~2压力下进行5分钟水压试验,不得出现渗漏,因而压铸模的设计与制造具有相当难度。图1为曲轴箱左半部。为了不破坏零件的 Due to the large increase in the production of motorcycles around, the demand for 250 crankcase is also growing. The original process for the sand box molding and low-pressure casting, long production cycle, and the outer surface of the rough, I switch to die-casting process to manufacture crankcase, has been successful. As part of the complex shape, wall thickness from 12.5 mm to 18 mm difference between the disparity, and requires 4kgf / cm ~ 2 pressure for 5 minutes hydrostatic test, no leakage occurs, so the design and manufacture of die casting is quite difficult. Figure 1 shows the left half of the crankcase. In order not to damage the parts