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目前,国内自行车行业中的曲柄热成形模具,主要由3Cr2W8V钢制造。该模具在300t摩擦压力机上使用时,每分钟冲压8～12件,模腔用油冷却,承受很大的冲击载荷、摩擦和热疲劳的作用。由于3Cr2W8V钢耐急热急冷和承受冲击的能力差,使用过程中曲柄模多以断裂形式失效,造成模具报废。我厂曲柄成形模外形尺寸如图1所示,原处理工艺为500℃、850℃两次预热,1080℃油淬,580～610℃两次回火,处理后硬度为HRC45～48,平均使用寿命4500件左右,寿命较低,生产成本高。为了提高模
At present, the domestic bicycle industry in the hot crank mold, mainly by the 3Cr2W8V steel. The mold used in the 300t friction press, stamping 8 to 12 per minute, the cavity oil cooling, to withstand large impact load, friction and thermal fatigue effect. As 3Cr2W8V steel is resistant to rapid thermal shock and poor ability to withstand the impact, the use of more crank mode failure in the form of failure, resulting in mold scrapped. The external dimensions of the crank forming die of our factory are shown in Fig. 1. The original processing technology is 500 ℃, preheating at 850 ℃ twice, oil quenching at 1080 ℃ and tempering twice at 580 ~ 610 ℃. The hardness after treatment is HRC45 ~ 48, About 4500 life expectancy, lower life expectancy, high production costs. In order to improve the model