论文部分内容阅读
一、引言: 在上抽芯式金属型重力铸造铝活塞中,人们总习惯把补缩冒口设计成圆柱形明冒口。这种冒口除提供足够的补缩液量外,介于浇道与型腔之间的还有“储热”、防止经过浇道的铝液温度进一步降低、保证成型的作用,因此,它较适用于小型薄壁活塞的生产。对于较大直径的铝活塞,特别是裙部高度远大于槽部高度与头部高度之和时,这种圆柱形明冒口不足之处就突出地表现出来,主要是:
First, the introduction: In the core-pulling metal gravity casting aluminum piston, people are always accustomed to the feeder risers designed as a cylindrical Ming riser. This riser in addition to providing sufficient amount of fluid, between the runner and the cavity there is “heat storage” to prevent molten aluminum through the runner to further reduce the temperature to ensure that the forming role, therefore, it More suitable for small thin-walled piston production. For larger diameter aluminum pistons, especially when the skirt height is much greater than the sum of the height of the groove and the height of the head, this lack of cylindrical riser is manifested primarily by: