Automated casting and molding production of cast iron water pump castings

In March 2023, we customized a non-standard horizontal parting automatic casting molding machine for a small sand casting enterprise, which is used for the automatic molding production of cast iron water pump castings. The size of the sand mold is 550mm x 650mm, and the height of the sand mold can be adjusted from 300mm to 500mm. The operation method of transporting and placing the sand mold using a pneumatic lifting car is adopted. During the day, the machine is used to complete the molding and placement of the sand mold, and at night, pouring workers melt metal iron to pour the sand mold. 300 sand molds are completed every day, producing 6T cast iron water pump castings.

The molding of this type of casting has a certain degree of difficulty. The shape of the pump body is in a deep concave state, with a depth of 160mm, and the top cross-sectional area of the deep concave is small. In the case of limited investment budget of the enterprise, using an automated casting molding machine with a single horizontal sandblasting cylinder is very unfavorable for sandblasting of this type of casting. In order to reduce the difficulty of molding, we place a film coated sand core with a clamp on the top of the inner cavity of the sand mold, and the mold plate adopts a design of overall sinking of 4mm, which is conducive to filling the sand during the hydraulic compaction process after sandblasting.

At the same time, we have added two compaction contact oil cylinders to the compaction plate of the lower sand box. When the molding machine is filled with sand injection, the main oil cylinder performs the first compaction inside the overall sand box. After compaction, the multi contact oil cylinder performs the second compaction on the deep concave internal cavity position, thereby obtaining the sand mold hardness that meets the pouring conditions. The design was completed after the user provided us with a mold and conducted practical testing before the equipment left the factory.

Record the casting site of the automated casting molding machine and the blank effect of the pump body casting after sand mold casting and cooling after it is put into use.