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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

Inactive Publication Date: 2021-01-29
NINGXIA LANGSHENG PRECISION MFG TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the technical problems of unstable quality of the regulating valve shell and high reject rate caused by the traditional pouring method

Method used

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Embodiment Construction

[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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Abstract

The invention discloses a negative-pressure vacuumizing pouring method for a high-pressure regulating valve casting. The method includes the following steps that S1, a sand mold is closed and put intoa tool which is a box body with an opening formed in the upper end, an air suction cavity is formed in the lower end of the box body, and the air suction cavity is separated from the box body througha filter screen; S2, the space between the box body and the sand mold is filled with dry sand; S3, after the spaced is full of the dry sand, plastic is laid at the upper end of the box body, and thedry sand is laid on the plastic; S4, a vacuum pump is started, and the air suction cavity is vacuumized; S5, pouring is conducted in the sand mold, and the vacuum pump is kept to be started; and S6, after pouring is completed, the vacuum pump is stopped. According to the method, the pouring speed is increased, the mold filling time of the high-pressure thick-wall casting is shortened, the qualityof the casting is further improved, particularly, the shrinkage crack defects of the chromium-molybdenum steel shot casting of the high-pressure regulating valve are overcome, and the problem of structure segregation of the high-pressure thick-wall valve body casting is effectively solved.

Description

technical field [0001] The invention relates to the technical field of valve pouring, in particular to a negative pressure vacuum pouring method for high-pressure regulating valve castings. Background technique [0002] High temperature and high pressure regulating valve has the characteristics of high pressure resistance, high temperature resistance, smooth flow, fast opening and closing and easy automatic control, and is widely used in natural gas, petroleum, electric power and other industries. The chrome-molybdenum steel sand casting used in the valve housing is the core component of the entire regulating valve, such as figure 2 As shown, a traditional casting mold includes an upper box (100), a lower box (101), a sprue cup (102), an upper and lower box parting surface (103) and a casting cavity (104). After casting this casting process, the casting The disadvantages are: it is not conducive to the control of pouring quality, the molten steel is easy to form turbulent f...

Claims

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Application Information

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IPC IPC(8): B22D18/06
CPCB22D18/06
Inventor 李鹏师墨栋王建鹏高昊马颖
Owner NINGXIA LANGSHENG PRECISION MFG TECH CO LTD
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