Process Design of Slag Pot

The characteristics of the slag pot are as follows: the outline is large, the wall is thick, there are many plate vertical bars distributed around the circle, and many local scattered hot joints are formed, which are easy to produce shrinkage porosity, shrinkage holes and cracks at the T-shaped bars.

The requirements for the casting quality of the slag pot are as follows: the inner surface of the slag pot must be smooth and smooth, there must be no convex and concave defects exceeding 5mm, the T-shaped bars connected to the tank body have no cracks, both sides of the earshafts must be concentric and horizontal, and the whole slag pot does not allow casting defects such as shrinkage holes, pores, slag holes and so on. Therefore, it is difficult to cast slag pots.

According to the structural characteristics and quality requirements of the slag pot, it is very important to select the casting scheme and process parameters. In view of the problems such as axis shrinkage, shrinkage, cracks and pores in T-shaped bars, necessary measures should be taken to ensure the quality of castings.

According to the structure and solidification characteristics of slag pot, the method of casting downward opening and centralized feeding of riser is an effective means to ensure the overall sequential solidification of castings and to achieve the requirement of dimensional precision. The advantages of this scheme are as follows: the combined molding of multi-box stacking and vertical casting, sand bed beating in the pit and pouring in the pit can make the casting sand collision convenient, the middle buoyancy is small, and there is no need to flip or move in the whole molding process; the use of sand boxes with sufficient stiffness and moderate iron pressing can prevent deformation and lead to box lifting. In addition, after pouring, the riser can be hot cut in the cast state in the in-situ pit, cooling outside the pit, several processes are staggered, and the production cycle is short, which can effectively improve the productivity and the utilization rate of molding area.