过去我们采用固定马架(即扩孔架)锻造中型环件(外径=250～950,内径=180～750,厚度=75～200),要用两部汽锤:3吨锤进行扩孔和成型,2吨汽锤进行平直校正和精校。这样就需要往返吊运锻件,因而增加了辅助时间,降低了生产效率。采用活动马架后,中型环件的扩孔、成型和校正可以在一部锤子上进行,所以生产效率提高了,过去要2火以上才能完成一个,现在只要一火,而且还可以 In the past, we used a fixed racks (ie, hole-expanding frame) forging the ring (outer diameter = 250 ~ 950, inner diameter = 180 ~ 750, thickness = 75 ~ 200), to use two hammer: 3 tons of hammer reaming And molding, 2 tons of steam hammer for straight calibration and fine school. This will require reciprocating lifting forgings, thus increasing the auxiliary time and reducing the production efficiency. After the movable rack, the middle hole reaming, forming and correction can be carried out on a hammer, so the production efficiency increased, in the past to be completed more than 2 fire one, now only a fire, but also can