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Method for manufacturing butterfly valve rod by powder metallurgy

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

Active 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 stem is required.

Method used

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Embodiment Construction

[0016] A method for manufacturing a butterfly valve stem by powder metallurgy, comprising the following steps:

[0017] a. Compounding material: with atomized iron powder as the matrix, the weight percentages of the remaining components are: scrap iron powder 4, nickel powder 3.5, tool steel powder 4, manganese sulfide powder 1.2, molybdenum disulfide powder 0.5, aluminum Powder 1.7, tungsten powder 0.2, niobium powder 0.02, graphite 1.1, polyamide wax micropowder 1.0, stearic acid 1.2;

[0018] b. Compression forming: Send the uniformly mixed powder metallurgy materials to the press and press them with a mold once to form a butterfly valve stem;

[0019] c. Sintering: Send the pressed and formed parts into a powder metallurgy sintering furnace for copper infiltration sintering. The sintering temperature is 1140°C and the sintering time is 1.3 hours;

[0020] d. Quenching treatment: Put the parts into the heat treatment furnace and heat them to 850-890°C, and keep them warm f...

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Abstract

The invention discloses a method for manufacturing a butterfly valve rod by powder metallurgy. The method includes steps of a, preparing a mixed material: using atomized iron powders as base materials, and mixing the atomized iron powders with other components of, by weight, 4%-6% of scrap iron powders, 3.5%-4.0% of nickel powders, 4%-6% of tool steel powders, 1.2%-1.3% of manganese sulfide powders, 0.5%-0.7% of molybdenum disulfide powders, 1.7%-1.9% of aluminum powders, 0.2%-0.4% of tungsten powders, 0.02%-0.03% of niobium powders, 1.1%-1.4% of graphite, 1.0%-1.5% of polyamide wax micro powders and 1.2%-1.8% of stearic acid; 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 butterfly valve rod. The method for manufacturing the butterfly valve rod by the powder metallurgy is high in production continuity, high in material utilization, suitable for volume-producing and capable of reducing costs, and the performance of the butterfly valve rod can meet requirements of normal use.

Description

technical field [0001] The invention relates to a method for preparing a valve stem of a butterfly valve, in particular to a method for manufacturing a valve stem of a butterfly valve by powder metallurgy. Background technique [0002] At present, in the butterfly valve industry, domestic butterfly valve stems are made of ordinary high-speed steel materials, or stainless steel materials are used to machine butterfly valve stems. 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 stem is required. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a powder metallurgy method for manufacturing butterfly valve stems with high production efficiency and low m...

Claims

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Application Information

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IPC IPC(8): B22F3/16C21D1/18C21D6/04C21D9/00
CPCY02P10/20
Inventor 沈升好
Owner ANHUI FANCHANG COUNTY WANNAN VALVE CASTING
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