(1. 重庆大学 机械工程学院， 重庆 400044；
2. 中国嘉陵集团重庆九方铸造有限责任公司， 重庆 400032)
摘 要: 采用高频感应加热装置和温度测定装置, 研究了ZL112Y压铸铝合金坯料高频感应加热二次重熔合适的半固态重熔温度、 加热功率和速度， 以及这些工艺参数对坯料的触变性能和微观组织的影响。结果表明： 该合金合理的半固态二次重熔温度为570～571℃； 在优化的感应加热工艺条件下， 半固态重熔坯料内部的温差在0～1℃； 半固态重熔过程使原始料坯中的α枝晶组织变成球团状和节杆状组织， 满足了半固态触变成型的要求。 采用实验室所获得的二次重熔工艺成功地压铸成形了JH70型摩托车发电机支架零件。
关键字: 半固态； 铝硅合金； 二次重熔工艺； 半固态成形
（1. College of Mechanical Engineering,
Chongqing University, Chongqing 400044, China;
2. Chongqing Jiufang Industry Ltd. Co.,
Chongqing Jialing Industry Company,Chongqing 400032, China）
Abstract:Using a high-frequency induction heating equipment and a device for temperature measuring, the reasonable semi-solid processing parameters, including semi-solid remelting temperature, heating power and speed, in the process of high-frequency reheating, and the effects of these parameters on thixotropic behaviors of billets and microstructures of the alloy were investigated. The results show that: 1) the proper semi-solid remelting temperature of the alloy is in the range of 570～571℃; 2) in the condition of optimal reheating processing, the temperature deviation in a billet is 0～1℃; 3) dendritical colonies of α phase in original billet change into isolated grains with forms of nodules and granule, which may satisfy the need of semi-solid thixoforming forming in theory. Further more, a component used in JH70 motors was formed in practice in semi-solid die casting processing by using the optimal semi-solid processing parameters obtained in laboratory.
Key words: semi-solid; Al-Si alloy; remelting processing; semi-solid forming
