铝合金轮铸件质量改进工艺探讨

Improvement of the Technology for Quality of Aluminum Alloy Wheel

针对液力变矩器导轮、泵轮铸件针孔、氧化夹渣缺陷,采用旋转喷吹法进行精炼,以期得到高纯净度的铝熔体。首先进行了多组对比试验,证明旋转喷吹法优于熔剂精炼法。随后,在变矩器厂铸铝车间生产条件下,研究了适合导轮、泵轮生产的旋转喷吹法工艺参数,使变矩器导轮、泵轮砂型铸件的针孔、氧化夹渣缺陷得到明显改善。确定适合导轮、泵轮生产的旋转喷吹主要工艺参数,精炼温度为720℃,喷头转速为480～500r/min,气体流量为1.6～2.0m3/h,熔剂加入速度为100～120g/min,喷吹熔剂时间为20～25min,喷气时间比喷吹熔剂时间延长5min,静置时间为20min。

Rotating spraying process was applied to refine aluminum melt in order to obtain high purified melt to eliminate the pinhole and oxide inclusion in the idler pulleys and the pump wheels.The rotating spraying process is distinctly superior to the flux method in refining aluminum alloy through a series of comparative experiments.Optimized processing parameters of rotating spraying process for decreasing pinhole and oxide inclusion in the idler pulleys and the pump wheel were presented in the practical production conditions.The optimized processing parameters are as follows:refining at 720 ℃,the rotary speed of the sprayer of 480～500 r/min,gas flow of 1.6～2.0 m3/h,the adding rate of flux of 100～120 g/min and spraying for 20～25 min as well as holding for 20 min and so on.