Casting method of centrifugal pump body

Abstract

A casting method of a centrifugal pump body comprises the following steps of: 1) urea core fabrication: mixing urea and white granulated sugar strictly at a mass ratio of 100:6, heating to 140-160 DEG C, injecting into a cavity after melting, taking out the urea core for inspection after cooling, allowing the urea core to be white and free from any open defects on the surface, 2) wax mold fabrication: controlling wax pressing temperature to be 55-62 DEG C, injection pressure to be 0.8-1.0MPa, injection time to be 50s, and dwell time to be 10min, allowing the surfaces of a wax mold and the cavity to be smooth, clean and free from cracks, 3) pouring system design: taking feeder head top pouring mode as an injection mode and adopting a crossed assembly welding mold head, 4) shell fabrication: adopting a silicasol technology and referring to Figure 3 for shell fabrication parameters in order to ensure shell strength and roughness of a cast surface, and 5) shell roasting and pouring: allowing the roasting temperature to be 1080-1000 DEG C and roasting time to be 1h. The method facilitates processing, improves the casting quality, and does not produce defects such as shrinkage cavities and slag inclusion.

Description

technical field [0001] The invention relates to pump accessories, in particular to a casting method for a HJB (F) high wear-resistant and corrosion-resistant negative pressure centrifugal pump body. Background technique [0002] HJB(F) high wear-resistant and corrosion-resistant negative pressure centrifugal pump is widely used in pulping, chemical industry, food and environmental protection to transport corrosive media such as high-concentration solid particles, such as in the chemical industry, HJB(F) high wear-resistant and corrosion-resistant negative pressure High-pressure centrifugal pumps can transport media containing solid particles that are easy to crystallize and corrode at high temperatures. The casting of the pump body is a difficult point. When the traditional pump body is cast, the flow of liquid in the mold cannot be controlled, and the temperature will gradually drop. If the mold itself has many turns and the area changes greatly, the temperature will drop ...

AI Technical Summary

Problems solved by technology

When the traditional pump body is cast, the flow of liquid in the mold cannot be controlled, and the temperature will gradually drop. If the mold itself has many turns and the area changes greatly, the temperature will drop faster. If it happens to be the solidification critical point of the liquid, Then the casting will inevitably have defects such as shrinkage cavity and slag inclusion.

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