汽阀是发动机的主要零件之一,多半用合金钢制成,经过锻造后再进行其他机械加工,以便节约材料,提高质量。汽阀的锻造一般都是采用套筒模子。这种方法的优点是:金属在封闭的模腔内成型,能够获得比较好的塑性,不会产生横向(径向)毛边;但它的缺点是:锻件成型后取出比较困难(特别在空气锤上镦粗),需要附加顶出装置,因此产量不高;另外,模子 Steam valve is one of the main engine parts, mostly made of alloy steel, after forging and other mechanical processing, in order to save material and improve quality. Steam valve forging is generally used sleeve mold. The advantage of this method is that the metal is shaped in a closed mold cavity to achieve better ductility without lateral (radial) burrs; however, it has the disadvantage that it is more difficult to remove the forging after it is formed On upsetting), the need for additional ejection device, so the yield is not high; In addition, the mold