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我厂生产的某一铝合金铸件(如图所示),其材料为铸铝ZL101。原采用砂型铸造,然后进行淬火加完全时效处理,要求抗拉强度σ_b≥20公斤/毫米~2。原砂型铸造生产的毛坯机械加工余量大,改为金属型铸造后,因铸件壁厚减薄,故在进行淬火加完全时效处理时,铸件变形甚大。为此,我们设想在铸件出模后尚具有一定的温度时淬火,最后只进行人工时效,这样既满足了机械性能的要求,又可以减少热处理时的变形。将铝水在740℃浇入预热到400℃的金属型中,凝固后在450～400℃开模,把铸件投入80～100℃水中淬火,最后进行人工时效。
I plant a certain aluminum alloy castings (as shown), the material is cast aluminum ZL101. The original sand casting, and then quenching plus complete aging, requiring tensile strength σ_b ≥ 20 kg / mm ~ 2. The original rough casting rough machining allowance, instead of metal casting, due to the thinning of the wall thickness, so the quenching plus complete aging, the cast deformation. To this end, we envisaged quenching at a certain temperature after the die was cast, and finally only artificial aging, so that both to meet the mechanical properties of the request, but also to reduce heat treatment deformation. The aluminum water is poured into a metal mold preheated to 400 DEG C at 740 DEG C, the mold is opened at 450 DEG C to 400 DEG C after the solidification, and the cast piece is quenched into the water of 80 DEG C to 100 DEG C and finally artificial aging is performed.