Determination of pouring position of zg310 large casting seat parts

The pouring position of castings refers to the position of large castings when pouring in the mold. Because the seat body is a large casting, it is easy to produce shrinkage porosity and shrinkage cavity defects due to large shrinkage during solidification; Combined with the principle that the selection of pouring position should be conducive to the sequential solidification of large castings, reduce the number of sand cores and strengthen the feeding effect of risers, and comprehensively consider the structure and material characteristics of large castings. In order to strive for stable liquid metal flow and reduce the generation of shrinkage cavity, porosity and other defects, large castings adopt open bottom injection gating system.

The sand box is high, which increases the difficulty of modeling. At the same time, it is more difficult to arrange the sand core and place it; The velocity of molten metal is fast, which is easy to cause sand washing and other defects.
The sand box is high, but the number of sand cores is the least; The bottom pouring static head is large, and the riser feeding design is convenient.
It can avoid sand hole, air hole, slag inclusion and other defects; The sand box is relatively low, the sand core layout is more difficult, and the riser design and placement are difficult.
Bottom injection type is required, but the large plane is easy to produce gas holes and slag holes at the top; Riser design is less difficult.

According to the position of parting surface of large castings listed, the position of scheme B is the final parting surface through comprehensive comparison, and scheme D is selected for pouring position, that is, scheme B is selected for molding time division, and scheme D is adopted for vertical pouring during pouring.

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