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图28是锻造工步及锻件图。延伸芯轴(图28b、c)是在400公斤空气锤上用5付甩子一火锻成。预锻、终锻突缘盘是在一台砧座带有长孔的400公斤空气锤上进行的
Figure 28 is forging steps and forgings. The extension mandrel (Fig. 28b, c) was forged on a 400kg air hammer with a 5 throwing torch. The pre-forged, final forged flange was made on a 400kg air hammer with an anvil