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过热管弯头形状比较复杂(参看图1),必须经过多次工艺变形,才能达到需要的形状. 各机车工厂制造方法各有差异,但工艺过程大体相同,即:下料、拍并(或直接下并料)、焖碗、拉筒、拍扁捏口成型. 最初我厂是在自由锻锤上锻造,其工艺过程如图2所示.在这种工艺变形过程中,经常出现的问题是:(1)拍并压并不易合适.厚了,不易拉筒,经常拉断;薄了,则容易产生折皱,且底部亦不易控制,经常因内部连通孔挤小而不能应用.(2)拉筒时也容易因冲头
Overheated pipe elbow shape is more complex (see Figure 1), must undergo a number of process deformation in order to achieve the desired shape of the locomotive factory manufacturing methods vary, but the process is generally the same, namely: cutting, filming (or Directly under and expected), stew bowl, pull the tube, shoot flat pinch mouth molding. Initially I plant forging in the free forging hammer, the process shown in Figure 2. In this process of deformation, the recurring problems Is: (1) beat and pressure is not easy to fit. Thick, easy to pull the tube, often pull off; thin, it is prone to wrinkles, and the bottom is not easy to control, often due to internal communication hole squeeze small and can not be applied. Pull the tube is also easy because punch