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用来冲制电池锌筒的冲棒一般由高速钢制作,若采用常规热处理工艺进行淬火、回火,冲棒使用寿命不高(每根只能冲2万只锌筒),失效形式一方面是表面耐磨性不够,另一方面易产生脆断。现采用下述工艺:1.低温淬火工艺:高速钢冲棒先经低温(560±10℃)和中温(850±10℃)两次预热后,转入高温盐浴中加热,W18Cr4V钢的淬火加热温度为1250～1260℃, W6Mo5Cr4V2钢为1180～1190℃,淬火加热时间按10s/mm计算,保温后入280±30℃硝盐浴,停留2～5min,空冷到室温,然后在560±10℃连续回火三次,每次1.5～2h。检查硬度,可达HRC62～64。
Used to punch the battery zinc cylinder punch generally made of high-speed steel, if the use of conventional heat treatment process for quenching and tempering, the service life of red stick is not high (each can only punch 20,000 zinc cylinder), the failure of the form Surface wear resistance is not enough, on the other hand easy to produce brittle fracture. Now using the following process: 1. Low-temperature quenching process: high-speed steel punch after the first low-temperature (560 ± 10 ℃) and medium temperature (850 ± 10 ℃) twice preheated, transferred to high temperature salt bath heating, W18Cr4V steel Quenching heating temperature is 1250 ~ 1260 ℃, W6Mo5Cr4V2 steel is 1180 ~ 1190 ℃, quenching time by 10s / mm calculation, after the heat into the 280 ± 30 ℃ nitrate bath, stay 2 ~ 5min, air cooled to room temperature, and then 560 ± 10 ℃ continuous tempering three times, each 1.5 ~ 2h. Check hardness, up to HRC62 ~ 64.