Powder metallurgy manufacturing method for valve flap of check valve

A technology of powder metallurgy and manufacturing method, applied in the direction of control valves, valve devices, functional valve types, etc., can solve the problems of poor strength and wear resistance, difficulty in controlling the dimensional accuracy of products, and high cost

Active Publication Date: 2013-03-27
ANHUI PUYUAN SEPARATION MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the iron-based powder metallurgy materials commonly used in my country are composed of copper, nickel, molybdenum and other precious non-ferrous metals, which are expensive, poor in strength and wear resistance, and difficult to control the dimensional accuracy of products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The disc powder metallurgy manufacturing method of the check valve includes the following steps,

[0018] a. Choose the following powder raw material powder metallurgy to make the valve disc by one-time pressing, and its weight percentage is: the balance is iron-based powder; carbon: 0.7%; molybdenum: 0.9%; aluminum: 1.1%; magnesium: 0.9%; tree ash : 0.3%; Zinc stearate: 0.8%;

[0019] b. Put the disc products obtained by sintering into No. 20~30 engine oil for 2-3 hours, and then conduct water atomization steam treatment, the treatment time is 3-5 hours, and the temperature is 550-650°C;

[0020] c. Heat treatment: normalize first, keep the steam-treated disc at 665-775°C for about 1-2 hours, take it out and then perform quenching treatment: put it into a heat treatment furnace and heat it to 540-680°C, and Keep warm for 2-3 hours; then, cool with quenching oil, and finally perform tempering treatment: put the quenched valve disc into the tempering furnace and heat it...

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PUM

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Abstract

The invention discloses a powder metallurgy manufacturing method for a valve flap of a check valve. The powder metallurgy manufacturing method comprises the following steps of: a, selecting the following powder raw materials in percentage by weight to form the valve flap through powder metallurgy one-time pressing: balance of iron-base powder, 0.7 percent of carbon, 0.9 percent of molybdenum, 1.1 percent of aluminum, 0.9 percent of magnesium, 0.3 percent of tree ash and 0.8 percent of zinc stearate; and b, placing the valve flap product obtained by sintering and forming into engine oil of No. 20-30 to soak for 2-3 hours, and performing water atomization steam treatment at the temperature of 550-650 DEG C for 3-5 hours. The valve flap is a powder metallurgy material which is mainly made of alloy steel powder and has the characteristics of capabilities of improving the strength, the corrosion resistance and the wear resistance of metal components and reducing the manufacturing cost.

Description

technical field [0001] The invention relates to a valve disc powder metallurgy manufacturing method of a check valve. Background technique [0002] Powder metallurgy technology can produce parts requiring high dimensional accuracy and complex shapes in a shape very similar to the shape of the product, which can greatly reduce cutting costs. Therefore, powder metallurgy products are used in various fields as parts of various machines and devices. [0003] Generally speaking, after mixing powder for alloy such as graphite powder and lubricant powder such as stearic acid and stearic acid file into iron-based powder to form iron-based powder mixed powder, the iron-based powder mixed powder is filled into metal Mold, press molding to manufacture iron-based powder compacts (compact powders) for powder metallurgy. Among them, the iron-based powder can be divided into iron powder (pure iron powder, etc.), alloy steel powder, etc. according to the composition. In addition, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16C22C38/12C23F17/00F16K15/00
Inventor 沈泽文彭哲沈云旌
Owner ANHUI PUYUAN SEPARATION MACHINERY MFG CO LTD
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