Process Optimization and Shrinkage Cavity Defects Analysis for Aluminum Alloy Head Cover of High Voltage Switch

Jin Huajun; Luo Pinghui

doi:10.15980/j.tzzz.2022.10.026

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Process Optimization and Shrinkage Cavity Defects Analysis for Aluminum Alloy Head Cover of High Voltage Switch
Vol. 42, Issue 10, Pages: 1318-1320(2022)
Published： 2022 ，
DOI： 10.15980/j.tzzz.2022.10.026

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Jin Huajun, Luo Pinghui. Process Optimization and Shrinkage Cavity Defects Analysis for Aluminum Alloy Head Cover of High Voltage Switch. [J]. Special Casting & Nonferrous Alloys 42(10):1318-1320(2022)
DOI：

Jin Huajun, Luo Pinghui. Process Optimization and Shrinkage Cavity Defects Analysis for Aluminum Alloy Head Cover of High Voltage Switch. [J]. Special Casting & Nonferrous Alloys 42(10):1318-1320(2022) DOI： 10.15980/j.tzzz.2022.10.026.

摘要

高压开关端盖铝合金铸件尺寸较大、形状复杂、综合性能要求高，铸造工艺难度大。铸件壁厚不均匀，存在多处孤立热节，在凝固时形成隔绝的熔池，补缩困难，因缩孔缺陷而导致的铸件废品率很高。使用ProCAST软件模拟铸造工艺，预测铸造缺陷并优化工艺参数。生产表明，提高浇注温度不能有效解决铸件的缩孔缺陷；增大冒口及冒口颈的直径可以保持补缩通道畅通且延缓了冒口的凝固时间，使缩孔导致的废品率从18%下降到0.3%

极大地改善了产品的品质。

Abstract

Al alloy head cover of high voltage switch with high comprehensive performance has large dimensions and complex shapes

which is difficult to casting. Homogeneous wall thickness of the aluminum alloy cover can result in some isolated hot spot to form isolated molten pool due to difficult feeding

so shrinkage cavity is formed during solidification process to lead to high scrap rate. The solidification process was simulated by the ProCAST software to predict defects and optimize process parameters. The practical production indicates that shrinkage cavity can not be eliminated effictively by increasing pouring temperature. Through enlarging feeding riser and diameters of riser neck as well as delaying solidification time

the unadequated rate resulting from shrinkage cavity is decreased from 18% to 0.3%

improving greatly the quality of aluminum alloy cover.