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普通铝合金压铸如何提高致密性?

来源:http://www.jnhjgs.cn     发布时间:2020-08-27 14:41:55    点击:

  近些年,汽车行业对于铝合金铸件的要求越来越高,尤其是对零件的泄露和力学性能有明显影响的致密性。厂家生产的普通铝合金压铸件,如何提高致密性呢?
  In recent years, the automotive industry has higher and higher requirements for aluminum alloy castings, especially the compactness which has a significant impact on the leakage and mechanical properties of parts. How to improve the compactness of common aluminum alloy die castings produced by manufacturers?
  方法一:适当提高压铸过程中的增压压力、缩短增压建压时间、加大内浇口厚度。铝合金压铸厂家通过这样的方式来处理压铸件,可以延长内浇口凝固时间,保持压力传递通道,让还没有完全凝固的压铸件可以充分补缩压实,消除一部分凝固收缩的影响,让组织更加致密。
  The first method is to increase the pressurization pressure, shorten the time of pressurization and increase the thickness of inner gate. The aluminum alloy die-casting factory can prolong the solidification time of the gate and maintain the pressure transmission channel, so that the die-casting parts which have not completely solidified can be fully fed and compacted, and part of the influence of solidification shrinkage can be eliminated, and the microstructure will be more dense.
                          山东铝合金压铸
  方法二:适当提高压室充满度,厂家建议以铝合金液体占压室体积的60-70%左右比较合适。
  Method 2: properly improve the filling degree of the pressure chamber. The manufacturer suggests that the aluminum alloy liquid should account for about 60-70% of the volume of the pressure chamber.
  方法三:适当降低压射速度,尤其是慢压射阶段。铝合金压铸厂家发现,较快的慢压射速度会将压室中的气体卷入合金液并带入零件。相反,较低的慢压射速度更容易让压室中的气体迅速排出,有效提高压铸件的致密性。
  Method 3: reduce the injection speed appropriately, especially in the slow injection stage. Aluminum alloy die-casting manufacturers found that the faster slow injection speed will draw the gas in the pressure chamber into the alloy liquid and bring it into the parts. On the contrary, the lower slow injection speed is easier to let the gas in the pressure chamber quickly exhaust, which can effectively improve the compactness of the die casting.
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