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| 低压铸铝件缩孔缺陷数值模拟与工艺改进 |
| Numerical Simulation and Process Improvement of Shrinkage Defects in Low Pressure Aluminum Castings |
| Received:September 24, 2021 |
| DOI：10.3969/j.issn.1674-6457.2022.04.017 |
| 中文关键词: 低压铸造 铝合金 铸造缺陷 数值模拟 工艺改进 |
| 英文关键词: low pressure casting aluminum alloy casting defects numerical simulation process improvement |
| 基金项目: |
| Author Name | Affiliation | | SHAN Yu | School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China | | WANG Ye-ji | Shanghai Huaming Power Equipment Co., Ltd., Shanghai 200333, China | | WANG Feng | Shanghai Huaming Power Equipment Co., Ltd., Shanghai 200333, China | | MA Jin-yuan | School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China | | SUI Da-shan | School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China |
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| 中文摘要: |
| 目的 为了避免铝合金盖板低压铸造过程产生的缩孔缺陷，对盖板结构进行分析。方法 采用数值分析技术，对盖板低压铸造过程进行数值模拟，将模拟结果与实际铸件缺陷进行对比，分析缩孔缺陷的产生原因。为消除铸件缩孔缺陷，在模具内增设冷却水道，并对该工艺进行模拟分析。结果 铸件凝固过程中，当合金固相率达到75%时，铸件特征位置处的补缩通道开始陆续关闭，形成了孤立液相区，导致凝固结束时形成缩孔缺陷。当模具内增设冷却水道后，铸件的缩孔体积分数由3.5%下降到0.8%。结论 通过在模具内增设合理的冷却水道，能加快铸件厚大部位的凝固速度，有利于实现顺序凝固，从而避免缩孔缺陷，提高铸件质量。 |
| 英文摘要: |
| The work aims to analyze the aluminium alloy cover plate structure to avoid the shrinkage defects in the low-pressure casting process of aluminum alloy cover plate. The low-pressure casting process of cover plate was numerically simulated through numerical analysis technology. The simulation results were compared with the actual casting defects, and the causes of shrinkage defects were analyzed. In order to eliminate the shrinkage defect of castings, a cooling water channel was added in the die, and the process was simulated and analyzed. The simulation results showed that when the solid content of the alloy reached 75%, the feeding channels at the characteristic positions of the casting began to close one after another, forming an isolated liquid phase region, resulting in the formation of shrinkage defects at the end of solidification. When a cooling channel was added in the die, the shrinkage cavity volume fraction of the casting decreased from 3.5% to 0.8%. The results show that the addition of a reasonable cooling water channel in the die can accelerate the solidification speed of thick casting parts, which is conducive to sequential solidification, so as to avoid shrinkage defects and improve the casting quality. |
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