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一、概述 铝合金活塞传统的生产方法一般采用双冒口金属型铸造,除浇注系统具有肥大的主冒口之外,对侧还设有肥大的付冒口,称双冒口活塞。冒口相对于活塞所占的比例较大,例如我厂原135G双冒口活塞毛坯与浇冒口的重量比为1:1.4,左右,铝液利用率仅40％,合金材料浪费很大,同时由于补缩冒口较大,蓄热较多,造成整个活塞凝固时间较长一次结晶有比较粗大的倾向。另外由于我厂熔炉生产能力的限制,单只活塞消耗的铝液相对较多,生产过程断断续续,模具工作温度变化较大,影响了活塞的铸造质量。针对双冒口活塞上述的问题,我们分析了铝活塞铸造生产的热传递过程和凝固结晶机理,七五年便进行
First, an overview of the traditional aluminum alloy piston production methods commonly used double riser metal casting, in addition to the casting system has a fat main riser, the contralateral also has a fat to pay riser, said double riser piston. For example, the weight ratio of our original 135G double-riser piston blank to the riser is 1: 1.4, and the utilization rate of liquid aluminum is only 40%. The alloy material is wasted greatly, At the same time due to larger feeder riser, heat storage more, resulting in a long time the entire piston solidification crystallization has a relatively large tendency. In addition, due to the limitation of the production capacity of our furnace, the aluminum liquid consumed by only one piston is relatively large, the production process is intermittent, and the working temperature of the mold changes greatly, which affects the quality of the casting of the piston. In view of the above problems of double-riser piston, we analyzed the heat transfer process and solidification crystallization mechanism of aluminum piston casting production, and carried out in 75 years