解决铝合金压铸件泄漏缺陷的模具优化设计

Die Optimization Design for Solving Leakage Defects of Aluminum Alloy Die Castings

以一款汽车发动机曲轴箱体为例,介绍了铝合金压铸件泄漏发生的部位,通过密封测试“气泡”试验及对铸件缺陷部位进行剖切检查,确定泄漏产生的原因是铸件内部有贯穿性缩孔和缩松,利用成因分析表对缩孔根本原因进行分析,并通过局部增压、增加型芯冷却、型腔成形表面加工散热网纹等模具优化方案,有效地解决曲轴箱体的缩孔缺陷,提高铝合金压铸件产品的一次合格率。

Taking an automobile engine crankcase as an example,this paper introduces the leakage parts of aluminum alloy die castings.Through the sealing test and sectioning inspection of the defective parts of the castings,it is determined that the leakage was caused by the penetrating shrinkage and porosity in the castings.The root causes of the shrinkage were analyzed by cause analysis table.And through the mold optimization design of local pressurization,increasing core cooling and adding heat dissipation reticulation on the surface of the place where the mold cavity contacts with the molten metal,the shrinkage defect of the crankcase has been effectively solved,and the first pass rate of the aluminum alloy die castings has been improved.