锻制铁路机车车辆轴,我厂采用五吨蒸汽自由锻锤,在锤头的下部和砧子的上部各装有一个车轴型砧,均属五铬锰钼材料制成。下型砧由于在工作过程中与车轴坯料接触时间长,温度较高,并因上型砧锻打受力,使用到一定时期后,下型砧两侧受击平面下塌(见图),致使锻出的车轴直径变小,不符合尺寸要求。对于这种情况,以前采用将下型砧退火、机械加工然后再淬火、回火的办法修复,这样工艺复杂,费用高,周期长,影响生产。为了解决这个难题,对下型砧下塌的两侧的平面进行电弧堆焊修复,经使用,符合锻模硬度要求,每焊修一次相当于一副新型 Forged railway rolling stock shaft, I plant the use of five tons of steam free forging hammer, the lower part of the hammer and the upper anvil mounted with an axle-type anvil, are made of five chromium-manganese-molybdenum materials. Under the anvil because the working process with the axle blank long contact time, the temperature is higher, and by the anvil forging force, the use of a certain period of time, under the anvil on both sides of the flat under the collapse (see Figure) As a result, the diameter of the forged axle becomes smaller, which does not meet the size requirements. For this situation, the previous use of the anvil under the type annealing, machining and then quenching, tempering approach to repair, this complex process, high cost, long cycle, affecting production. In order to solve this problem, the lower anvil anvil collapse on both sides of the plane arc surfacing repair, by using, in line with the hardness of the forging mold, each welding repair equivalent to a new type