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一、砂型浇注铝合金铸件补缩砂型浇注铝合金铸件时,常采用冒口配合冷铁,以补缩铸件的凝固收缩,防止缩凹、缩孔和缩松,这是获得健全铸件的有效方法。但冷铁表面处理不好,容易产生气孔。冷铁的生产、管理、回收都需专人负责。而普通砂型冒口和铸件有相同的凝固系数,冒口金属液有效利用率很低。为了保证铸件的顺序凝固,还需加放工艺补贴,以后又用机械加工方法去掉它,从而增加了加工费用,所以有必要研究铝合金铸件的补缩新技术。二、在铝合金铸件上漂珠保沮材料的探讨漂珠保温材料因其来源广,价格便宜,成型工艺简单,常温抗压、抗弯强度大、耐火度高,得到
First, sand cast aluminum alloy castings Sand casting pouring aluminum alloy castings, often with riser with chilled iron to shrink casting shrinkage, to prevent shrinkage, shrinkage and shrinkage, which is an effective method to obtain sound castings . However, cold iron surface treatment is not easy, prone to stomata. Cold iron production, management, recycling must be someone responsible. Ordinary sand-type risers and castings have the same coagulation coefficient, riser liquid metal effective utilization is very low. In order to ensure the order of casting solidification, the need to add technology subsidies, and later with mechanical processing methods to remove it, thereby increasing the processing costs, it is necessary to study the aluminum alloy casting new technology. Second, the floating beads in the aluminum alloy castings to discuss the material Duo beads insulation materials because of their wide source, cheap, simple molding process, room temperature compression, bending strength, high refractoriness, get