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我厂主要生产8.8级以上的高强度汽车紧固件。其材料为35、40Cr钢,热处理质量要求高,单件成品硬度差不得超过HRC3,批量生产不得超过HRC5,全脱碳层应≤0.015mm;8.8及9.8级产品半脱碳层应≤1/2H_1(螺纹高度),10.9级产品应≤1/3H_1,12.9级产品应≤1/4 H_1。过去我们利用盐浴炉加热淬火,能耗大,环境污染严重,劳动强度大,且保证不了硬度和脱碳层的要求。后来通过技术改造,采用了两台吴县热处理设备厂生产的DM-22网带炉淬火。经半年多的生产实践,证明效果良好。
I plant mainly produces 8.8 above the high-strength automotive fasteners. The material is 35, 40Cr steel, heat treatment of high quality requirements, the difference between the hardness of a single piece shall not exceed HRC3, mass production shall not exceed HRC5, decarburization layer should be ≤ 0.015mm; 8.8 and 9.8 semi- 2H_1 (thread height), 10.9 products should be ≤ 1 / 3H_1, 12.9 products should be ≤ 1/4 H_1. In the past we use salt bath furnace quenching, energy consumption, serious environmental pollution, labor-intensive, and can not guarantee the hardness and decarbonization requirements. Later, through technological innovation, using two Wuxian heat treatment plant DM-22 mesh furnace with furnace quenching. After more than six months of production practice, proved effective.