Casting method of mud pump air dome shell for bearing pressure

Abstract

The invention discloses a casting method of a mud pump air dome shell for bearing pressure. The method comprises the following steps: step one. setting process, namely selecting the air dome shell with a downward big opening; optimizing working allowance layer on an outer sphere of the air dome shell; manufacturing a sphere sand core and a core head and a corresponding fixing rod; arranging a thermal-preservation open riser on the top end of the air dome shell; arranging two chilling blocks at the opening end of the air dome shell; installing a pouring runner; and drawing an art work sheet; step two, casting, namely manufacturing a wood core box for a solid pattern and the ball-shaped spherical sand core and the core head; modeling, taking out the solid pattern to form a cavity; manufacturing the spherical sand core, the core head, and a sand core skeleton, and placing an exhaust rope; spraying the paint; carrying out mold assembling, baking a sand mold, pouring, opening the mold; primarily blasting sand; grinding and repairing; normalizing, secondarily blasting sand to obtain the product. Through the adoption of the method disclosed by the invention, the manufactured air dome shell is high in cast precision, and the production cost is obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of mechanical equipment manufacturing and relates to a casting method for an air bag casing of a mud pump for pressure bearing. Background technique [0002] The air bag is an important part of the mud pump of oil drilling equipment. It plays the role of stabilizing the pressure and reducing the fluctuation during the drilling process. The air bag shell is the part that mainly plays the role of protection and pressure bearing. refer to figure 1 , figure 2 , the shape of the air bag shell 1 is a hollow sphere, and the technical requirements are: magnetic particle flaw detection on the inner and outer surfaces, volumetric nondestructive testing, and hydrostatic pressure test with a pressure of 52Mpa. [0003] In order to ensure product quality, it is generally made of forgings, and the material is 35CrMoA. However, the air bag shell forged in this way is difficult to machine in the later stage, and the prod...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a casting method for the air bag casing of a mud pump for pressure bearing, which solves the problem that the machining of the forging air bag casing in the prior art is difficult and leads to high production costs

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