大型压铸件慢压射工艺优化研究  

Optimization of Slow-Shot Process for Large Die-Castings

作　　者：吴锟钰[1] 吴树森[1] 万里[1] 方健儒 周承广 

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074 [2]一汽铸造有限公司,吉林长春130000

出　　处：《铸造》2011年第8期743-747,共5页Foundry

基　　金："高档数控机床与基础制造装备"科技重大专项资助项目(2009ZX04013-033)

摘　　要：对于大型复杂压铸件,压铸生产过程中金属液流动复杂,容易在压射室内形成卷气,进而致使压铸件产生气孔等严重缺陷。本研究针对大型铝合金变速箱壳体零件的慢压射过程进行理论分析和仿真模拟,并以理论分析得到的临界慢压射速度作为参考,结合数值模拟软件的模拟结果分析得出了最优的慢压射工艺参数。模拟结果显示,通过优化慢压射冲头速度、冲头加速度等工艺参数,可以有效地减少甚至避免金属液在压射室内形成卷气和困气,有利于提高压铸件的质量,实际生产效果与模拟结果相符。For large and complex castings, it is easy to form air entrapment in shot sleeve due to the complex flow condition of liquid metal, which may make die castings form serious gas-hole defects. The theoretical analysis and numerical simulation for slow-shot process of large aluminum alloy gearbox were carried out in this paper. Taking the critical velocity＇of plunger obtained by theoretical analysis as reference and combining with the simulation results, the optimal slow-shot process parameters were acquired. Simulation results indicate that it can effectively reduce or even eliminate air entrapment in liquid metal in shot sleeve through optimizing process parameters such as plunger velocity and plunger acceleration, and consequently improve quality of die castings. Eventually, the simulation result was in accord with the actual production result.

关 键 词：慢压射 数值模拟 卷气 工艺优化 

分 类 号：TG249.2[金属学及工艺—铸造]