直浇道的功能是:从浇口杯引导金属向下,进入横浇道、内浇道或直接导人型腔。提供足够的压力,使金属液在重力作用下能克服各种流动阻力,在规定时间内充满型腔。直浇道常做成上大下小的锥形,等断面的柱形和上小下大的倒锥形。对铝、镁合金铸件,也用蛇形、片状和缝隙式的直浇道。
浇注温度越高、直浇道空心面积率越大,铝液充型速度越快。
The higher the pouring temperature or the larger the sprue hollow area rate is, the faster the filling velocity of molten aluminum is.
一定的直浇道长度及直浇道面积有利于提高铝液的充型速度。
It will be helpful to improving the filling velocity when the sprue length and sprue areas are controlled to some extent.
得出的优化方案为将原始铸造工艺中的双直浇道结构改为较为简单的单直浇道系统;
The optimum process is that, the double-gating system in original process is replaced with a single-gating system.
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