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介绍了型壳局部淬水工艺及其要点,并用大量事例证明,型壳局部淬水改变了铸件凝固时的温度分布和凝固顺序,消除了由于铸件热节、局部型壳过厚引起的缩孔、缩松、组织不致密等缺陷,具有“冷铁效应”。同时,提出了法兰类阀体、阀盖铸件采用型壳局部淬水工艺时,法兰盘厚度(H)与阀体壁厚或流量孔壁厚(M)之比的有效值,即H:M≤3。
This paper introduces the process and the key points of partial quenching of the shell, and proves with a large number of cases that the partial quenching of the shell changes the temperature distribution and the solidification sequence during the solidification of the casting, and eliminates the shrinkage caused by overheating of the partial shell due to the hot section of the casting , Shrinkage, the organization is not dense and other defects, with “cold iron effect ”. At the same time, the flange-type valve body is proposed. The effective value of the ratio of flange thickness (H) to valve body wall thickness or flow hole wall thickness (M) ≤3.