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当前迫切需要节约能源,这样影响材料领域更多地应用铝合金。如同生产高质量铝铸件工艺一样,挤压铸造工艺也正在调查研究和开发全自动机械。由下列可以看出调查研究的结果:(1)关于 Al-Si(20%Si 以上)和 Al-Cu(10%Cu 以上)的挤压铸造,其临界的压力随合金浓度的增大而增加。(2)临界的挤压压力取决于铸件的厚度和壁厚的增减。临界挤压压力同样随铸件状况而变化。它适用于直接浇注后挤压压力,尤其是薄壁铸件。(3)杂质的容许范围由合金内和挤压铸造的热处理最佳值所决定。(4)按照这些结果,开发了一台全自动挤压铸造机。它的特性是推入熔炼装置,即连续地顺序浇注和挤压,以及由微型电子计算机对挤压压力和速度的控制。(5)在机械加工去除浇道废料后,能成功地生产出高质量铸件。
At present, there is an urgent need to save energy, thus affecting the application of aluminum alloy materials more. As with the production of high quality aluminum castings, squeeze casting processes are also being investigated for research and development of fully automatic machines. The results of the investigation can be seen from the following: (1) With respect to the squeeze casting of Al-Si (over 20% Si) and Al-Cu (over 10% Cu), the critical pressure increases as the alloy concentration increases . (2) The critical extrusion pressure depends on the thickness and wall thickness of the castings. The critical extrusion pressure also varies with the condition of the casting. It is suitable for direct extrusion pressure after pouring, especially thin-walled castings. (3) The allowable range of impurities is determined by the optimum heat treatment within the alloy and extrusion casting. (4) According to these results, an automatic squeeze casting machine was developed. Its features are pushed into the smelting plant, that is, continuous sequential casting and extrusion, as well as the control of extrusion pressure and speed by the microcomputer. (5) High-quality castings can be successfully produced after machining to remove runner scrap.