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Casting method of high-strength valve cover

A high-strength, valve cover technology, used in casting molding equipment, molds, mold components, etc., can solve the problems of small driving torque, short service life, low qualification rate, etc., to improve quality, long service life, qualified high rate effect

Inactive Publication Date: 2012-10-24
ANHUI FANCHANG COUNTY WANNAN VALVE CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Butterfly valve, also known as flap valve, is a regulating valve with simple structure. It can also be used for switch control of medium in low-pressure pipelines. Flow function; butterfly valve has the characteristics of simple structure, small size, light weight, low material consumption, small installation size, fast switching, small driving torque, etc. It is used to cut off, connect and adjust the medium in the pipeline, and has good fluid performance Control characteristics and closing and sealing performance. At present, the casting process of high-strength bonnet mainly adopts conventional casting, which is often accompanied by the disadvantages of complicated process, low pass rate and short service life of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: the casting method of high-strength bonnet, comprises the following steps:

[0013] (1) According to the composition of raw materials by weight, 30-40 parts of pig iron, 25-35 parts of scrap steel, 5-10 parts of carbon steel, 3-8 parts of graphite, 10-20 parts of attapulgite, 5-10 parts of ferroboron and silicon Weigh 3-5 parts of ferroalloy as raw material;

[0014] (2) Heat the above-mentioned raw materials to 1400-1500°C to melt into molten metal, then add 3-8 parts of modified calcium carbonate powder, 4-6 parts of sodium silicate aqueous solution, and 5 parts of aluminum oxide to the above-mentioned molten metal -10 parts and 3-8 parts of silicon carbide powder, mix well to form pouring liquid;

[0015] (3) Pour pouring liquid into the sand mold through the gate, cool and solidify, take it out and steam treatment to obtain a high-strength valve cover, the steam treatment is water atomization steam treatment, the treatment time is 1-2 hours, and the t...

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PUM

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Abstract

The invention discloses a casting method of a high-strength valve cover. The method comprises the following steps: 1, weighing 30-40 parts by weight of pig iron, 25-35 parts by weight of scrap steel, 5-10 parts by weight of carbon steel, 3-8 parts by weight of graphite, 10-20 parts by weight of attapulgite, 5-10 parts by weight of ferroboron, and 3-5 parts by weight of an Si-Fe alloy; 2, heating to 1400-1500DEG C to fuse to a metal liquid, adding 3-8 parts of modified calcium carbonate powder, 4-6 parts of an aqueous solution of sodium silicate, 5-10 parts of alumina and 3-8 parts of silicon carbide powder to the metal liquid, and uniformly mixing to form a casting liquid; and 3, casting, cooling to solidify, taking out, and carrying out steam treatment to obtain the high-strength valve cover. The method has the advantages of reasonable composition raw material formula and simple technology, and the prepared high-strength valve cover has the advantages of good performances, long service life, and high qualification rate, so the method which enables the product quality to be substantially improved is suitable for wide popularization.

Description

technical field [0001] The invention relates to a casting method of a high-strength valve cover, which belongs to the technical field of valve casting. Background technique [0002] Butterfly valve, also known as flip valve, is a regulating valve with simple structure. It can also be used for switch control of low-pressure pipeline medium. Low consumption, small installation size, fast switching, small driving torque, etc., used to cut off, connect and adjust the medium in the pipeline, with good fluid control characteristics and closing and sealing performance. At present, the casting of high-strength valve cover The process mainly adopts conventional casting, which is often accompanied by the disadvantages of complex process, low pass rate and short service life of the product. Contents of the invention [0003] The purpose of the present invention is to provide a casting method for a high-strength bonnet. The composition of the present invention is reasonable in raw m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C9/22C22C37/10B22D1/00
Inventor 沈升好
Owner ANHUI FANCHANG COUNTY WANNAN VALVE CASTING