自1956年开工生产至今三十余年来,一汽曲轴、前轴锻件生产一直是用锤锻工艺,即以模锻锤为主机的生产线进行着。这种生产线虽在一汽的生产中起过重要作用,但却存在下列问题:(1)前轴掉头锻造保证不了长度公差与两头部扭转公差;(2)前轴拉长、校正工艺不稳,无法组织多品种大量生产;(3)曲轴锤模锻件精度低、热处理变形 Since the start of production in 1956 for more than 30 years, FAW crankshaft, the production of the front axle forgings has been used forging process, namely forging hammer for the host of the production line. Although this production line has played an important role in the production of FAW, but it has the following problems: (1) the front axle forging can not guarantee the length tolerance and torsion of the two head tolerance; (2) the front shaft elongation, the correction process is not stable , Unable to organize large-scale production of many varieties; (3) crankshaft hammer forging low accuracy, heat treatment deformation