(四)液压系统原理图设计例题以DS-033型500吨管子镦边液压机为例,具体分析液压原理图的没计步骤。这是一台为柴油机缸套提供毛坯的专用液压机,它可将图21(a)的管坯经压机加工成图21(b)的坯料,要求约每分钟生产1件。 1.工艺分析这个零件若采用冷成形,则变形力较大。现采用中频电感应局部加热镦边工艺。通过计算与实测,变形力约400多吨,为留有余地,取压机公称压力为500吨,回程力按公称压力的15％选取,约80吨。压制后的零件需从模具中顶出,考虑到这是一台专用液压机,且顶出 (D) Hydraulic System Schematic Design Example To DS-033-type 500 tons of pipe upsetting hydraulic machine, for example, the specific analysis of hydraulics schematics no steps. This is a special hydraulic machine for roughing the cylinder liner of a diesel engine. It can be used to press the tube of Figure 21 (a) into the blank of Figure 21 (b) and produce about one per minute. 1. Process Analysis If this part of the cold forming, the deformation force larger. Is the use of IF induction heating local upsetting process. Through calculation and measurement, the deformation force is about 400 tons, leaving room for the nominal pressure of the compressor to be 500 tons. The return force is selected according to 15% of the nominal pressure, about 80 tons. The pressed parts need to be ejected from the mold, taking into account that this is a special hydraulic press and the top