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破碎机是粉碎矿石的设备,使用时受巨大冲击载荷所产生的弯矩、扭矩作用。我厂外协生产的破碎机PEX—250×1000主轴是用35CrMo材料制成,直径为220mm,长为1930mm。技术要求:35CrMo符合Q/ZB61—73,锻件退火硬度≤207HB,调质硬度240-260HB,无损探伤无裂纹等缺陷。 该产品于去年冬季出厂,河南一用户在大风降温之际使用中突然发生主轴断裂。经宏观、微观质量分析,找到了主轴脆性断裂的原因,提出了防断措施。 1.对主轴断口的宏观分析
Crusher crushing ore equipment, the use of a huge impact load generated by the bending moment, the role of torque. I plant outside the production of crusher PEX-250 × 1000 spindle is made of 35CrMo material, a diameter of 220mm, length of 1930mm. Technical requirements: 35CrMo in line with Q / ZB61-73, forging annealing hardness ≤ 207HB, quenching hardness 240-260HB, non-destructive testing no cracks and other defects. The product was shipped in the winter last year, Henan, a user in the occasion of the wind cooling in the sudden occurrence of spindle fracture. By macroscopical and microscopic analysis of mass, the reason of brittle fracture of main shaft was found, and the measures of preventing breakage were put forward. 1. Macro analysis of the spindle fracture