我厂多年生产U—型固定式矿车,容积1.1m~3,最大牵引力6000kgf。矿车轮部弹性压盖,原采用6mm厚的45钢板制做,外观如图1所示。弹性压盖硬度要求HRC30～38。原工艺采用800℃加热,10%NaCl水溶液冷却,工件淬火后,约有10～15%发生开裂,并且在安装紧固过程中仍有少量压盖开裂,严重影响产品质量。 1983年以来,弹性压盖改用4.5mm厚的A3钢板(做矿车斗剩余边角料)制做,进行 I plant for many years the production of U-type fixed tub, volume 1.1m ~ 3, the maximum traction 6000kgf. Mine wheel gland elastic, the original use of 6mm thick 45 steel system, the appearance shown in Figure 1. Elastic gland hardness requirements HRC30 ~ 38. The original process using 800 ℃ heating, 10% NaCl aqueous solution cooling, quenching the workpiece, about 10 ~ 15% cracking occurred, and in the installation and fastening process there is still a small amount of gland cracking, seriously affecting product quality. Since 1983, the elastic gland switch to 4.5mm thick A3 steel (do the rest of the car bucket scrap) system to do