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Abstract：
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For the quenching crack and other quality problems caused by residual heat quenching of automobile steering knuckles, taking the residual heat quenching test of automobile steering knuckle for Refine, JAC as an example, the parameters of hardness profile gradient, metallographic structure and grain size grade for steering knuckle were detected under different working conditions by starting one or two quenching medium circulating stirring pumps. And the field tests were conducted on them respectively. By analyzing the influence of opening number for circulating stirring pumps in the hot quenched oil tank on the internal structure of steering knuckles, it is found that the opening number of circulating stirring pumps has a significant influence on the depth of quenched layer when the temperature and cooling characteristics of medium remain unchanged. Then, it is proved that it is the best choice to open two circulating stirring pumps. Using two circulating stirring pumps simultaneously can not only ensure the cooling uniformity, but also improve the overall quenching hardness of forgings and the level of metallographic structure.
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Funds：
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重庆市教委科学技术研究计划资助项目（KJQN 201903404）
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AuthorIntro：
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徐皓（1979-），男，硕士，教授级高级工程师，E-mail：379280626@163.com
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Reference：
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