Method for manufacturing check valve core by powder metallurgy

A powder metallurgy, check valve technology, applied in the field of check valve spool preparation, can solve the problems of low material utilization rate and slow processing speed, and achieve high material utilization rate, high production continuity and cost reduction. Effect

Inactive Publication Date: 2012-11-14
ANHUI FANCHANG COUNTY WANNAN VALVE CASTING
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AI Technical Summary

Problems solved by technology

The processing speed is slow and the utilization rate of materials is not high. However, the globe valve manufactured by powder metallurgy process not only has high material utilization rate, but also is suitable for mass production. Before assembly and use, a small amount of fine grinding of powder metallurgy valve body is required.

Method used

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Embodiment Construction

[0015] A powder metallurgy preparation method for a check valve spool, comprising the following steps:

[0016] a. Compounding material: with electrolytic iron powder as the matrix, the weight percentages of the remaining components are: scrap steel powder 35, returned iron powder 5, manganese powder 3.5, molybdenum powder 0.4, chromium powder 0.3, molybdenum disulfide powder 0.3, Waste aluminum powder 0.8, graphite 1.8, stearic acid less than 45 microns 2.0;

[0017] b. Compression forming: Send the evenly mixed powder metallurgy materials to the press and press them with a mold once to form a check valve core;

[0018] c. Sintering: Send the pressed and formed parts into a powder metallurgy sintering furnace for copper infiltration sintering. The sintering temperature is 1140°C, the sintering time is 1.3 hours, and the density of the sintered billet is 7.9g / cm 3 .

[0019] d. Quenching treatment: Put the parts into the heat treatment furnace and heat them to 840-880°C, and...

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Abstract

The invention discloses a method for manufacturing a check valve core by powder metallurgy. The method includes steps of a, preparing a mixed material: using electrolytic iron powders as base materials, and mixing the electrolytic iron powders with other components of, by weight, 35%-40% of scrap steel powders, 5%-6% of recirculated iron powders, 3.5%-3.8% of manganese powders, 0.4%-0.5% of molybdenum powders, 0.3%-0.5% of chromium powders, 0.3%-0.5% of molybdenum disulfide powders, 0.8%-1.1% of waste aluminum powders, 1.8%-2.0% of graphite and 1.5%-2.0% of stearic acid which is smaller than 45 microns; and b, performing pressing molding: feeding the evenly mixed powder metallurgy material to a press machine, and performing the pressing molding by means of a mold to form the check valve core. The method for manufacturing the check valve core by the powder metallurgy is high in production continuity, high in material utilization, suitable for volume-producing and capable of reducing costs.

Description

technical field [0001] The invention relates to a method for preparing a check valve core, in particular to a powder metallurgy preparation method for a check valve core. Background technique [0002] At present, the domestic spherical check valve cores are all made of ordinary high-speed steel materials, or stainless steel materials are machined into spherical check valve cores. The processing speed is slow and the material utilization rate is not high. However, the globe valve manufactured by powder metallurgy process not only has high material utilization rate, but also is suitable for mass production. A small amount of fine grinding of powder metallurgy valve body is required before assembly and use. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a powder metallurgy preparation method for a check valve core with high production efficiency and low manufacturing cost, aiming at the current technical situation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16C21D1/18C21D6/04
CPCY02P10/20
Inventor 沈升好
Owner ANHUI FANCHANG COUNTY WANNAN VALVE CASTING
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