Negative-pressure vacuumizing pouring method for high-pressure regulating valve casting
A technology of high-pressure regulating valve and pouring method, which is applied in the field of valve pouring, can solve the problems of unstable quality of the regulating valve shell and high scrap rate, achieve the effects of reducing the follow-up repair rate and repair amount, improving the quality of castings, and overcoming tissue segregation
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[0016] The present invention is described in further detail now in conjunction with accompanying drawing. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.
[0017] The invention is a negative pressure vacuum casting method for a high-pressure regulating valve casting, which comprises the following steps:
[0018] S1. Put the sand mold into the tooling after closing the box, such as figure 1 As shown, the tooling is a box body 1 with an open upper end, and the lower end of the box body 1 is provided with an air suction chamber 2, and the air suction chamber 2 and the box body 1 are separated by a filter screen 3;
[0019] S2. Fill dry sand between the box body 1 and the sand mold;
[0020] S3. After the dry sand is filled, lay plastic on the upper end of the box body 1, and lay dry sand on the plastic;
[0021]...
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