我厂生产的船用离合器减速齿轮,均采用18CrNiWA钢制成。原用自由锻造法在三千吨水压机上用2.5吨锭直接开坯锻成,其锻造毛坯如图1所示。这种工艺不仅锻造比小,锻件中心锻压不透,存在残余的树枝晶等铸态组织;而且锻件余量大,材料利用率低,浪费了大量的贵重材料和机械加工工时,增加了产品成本。 I plant production of marine clutch reduction gear, are made of 18CrNiWA steel. The original free forging method in the three thousand tons hydraulic press with 2.5 tons of ingots directly forged blanks, the forging blank shown in Figure 1. This process is not only forging ratio is small, forging center forging opaque, there are residual dendrites and other as-cast structure; and forgings surplus, low material utilization, wasting a lot of valuable materials and machining time, increasing product cost .