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ZL30A(935×400×160,壁厚70)、ZL30C(940×358×250,壁厚140)后平衡重是我厂所生产的装载机上的平衡零件。材质为HT150,毛重分别为270kg和400kg,属厚实类平板件,如图1、2。由于铸件端头有两凸台,造成热节的集中;又由于A表面质量要求高,处于分型面的下部,铸件凸台在上箱,故经常产生很大的缩凹、缩孔缺陷,占总浇注数的95％以上。为此,我们运用均衡凝固理论,对原工艺进行了改进,解决了ZL30A、ZL30C后平衡重的缩凹、缩孔缺陷。
ZL30A (935 × 400 × 160, wall thickness 70), ZL30C (940 × 358 × 250, wall thickness 140) After the balance weight is the balance of the loader on the production of parts. Material for the HT150, gross weight was 270kg and 400kg, is a thick type of flat-panel pieces, as shown in Figure 1,2. As the end of the casting has two bosses, resulting in the heat section of the concentration; and because A surface quality requirements are high, in the lower part of the sub-surface casting bosses on the box, it often produces a large shrinkage, shrinkage defects, The total number of pouring more than 95%. To this end, we use the theory of equilibrium solidification, the original process has been improved to solve the balance weight ZL30A, ZL30C shrinkage, shrinkage defects.