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我厂在生产 X25耐热钢管子铸件时(这种管子主要是横向承受负荷),起先是上浇以后改为下浇。但是都由于冒口锥度部分阻碍收缩,几乎所有铸件都在冒口颈部以下200公厘内产生了热裂纹。后来采用活动垫块热松箱的办法,及时松散了冒口部分的砂子,完全消除了这种热裂,也避免了使用吊车,耽误热松箱的时间。改进的方法如下:1)在铸件冒口颈稍下杓100～150公厘的两箱接合缝四角上垫上火砖块,厚度为50～70公厘如附图。为避免两箱接合缝四侧漏砂可以贴上薄铁板。2)冒口
I plant in the production of X25 heat-resistant steel pipe casting (this pipe is mainly horizontal load), at first after the pouring to the next pouring. However, almost all of the castings produced hot cracks within 200 mm below the neck of the riser because of the impeller taper part that hindered the shrinkage. Later, the activities of thermal pad box cushion approach, loose part of the riser part of the sand, completely eliminating this hot cracking, but also to avoid the use of cranes, delay the time of hot pine box. The improved method is as follows: 1) In the cast riser neck slightly below the bowl 100 to 150 mm two box joints four corners of the fire pad on the corner, a thickness of 50 to 70 mm as the photo. In order to avoid the two boxes of joint seam leakage sand can be attached to thin iron plate. 2) riser