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Powder metallurgy technique

A powder metallurgy and process technology, applied in the field of powder metallurgy process, can solve problems such as poor adaptability, achieve the effects of reliable finished product performance, enlarge metal crystallization, and reduce oxidation

Active Publication Date: 2008-08-27
ZHEJIANG ZHONGPING POWDER METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its manufacturing process still has limitations, and its adaptability to special process requirements is poor

Method used

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  • Powder metallurgy technique

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Embodiment

[0021] figure 1 Shown is a schematic representation of the process flow of the embodiment of the present invention, including:

[0022] Mixing step: mix the raw and auxiliary materials evenly according to the proportion.

[0023] Pressing step: Send the mixed iron powder into the upper part of the press, and put it into the cavity of the mold through the powder filling box for automatic pressing. The pressing speed is 8 pieces per minute, and then send it to the turntable with a manipulator.

[0024] Sintering steps: sintering in the mesh belt sintering furnace, conveying from the inlet with a stainless steel mesh belt, and discharging from the outlet takes 4 hours, the preheating temperature is 730°C with electric heating, and the sintering temperature is 1100°C. Hydrogen and nitrogen are used as the protective atmosphere, the purpose of which is to reduce the oxygen in the iron-based products with hydrogen, and the nitrogen is used as the protective atmosphere to prevent th...

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Abstract

The invention provides a powder metallurgic process, which comprises the following steps of: pressing, sintering, soaking in oil, finishing and treating with steaming. In the process steps, iron-based powders are uniformly mixed according to a ratio and are transmitted to a presser; the presser transmits the iron-based powders into a preset product mold and presses to obtain a rough product; the rough product is arranged in a conveying mesh belt, which conveys the rough product to a sintering furnace according to a set speed; air is used for repeated extraction and pressurization in the sintering process, and the temperature of the sintering furnace is adjusted to sinter the rough product to a semi-product; the semi-product is cooled and soaked in engine oil and is subjected to fine correction in a sizing die; the corrected semi-product is subjected to steam treatment to form a rustproof layer and to deburring treatment by shot blasting, vibration and manual deburring. The product has high performance-price ratio, and a dense protection film is formed on the product surface to improve the rustproof performance.

Description

technical field [0001] The invention relates to a metallurgy process, in particular to a powder metallurgy process. Background technique [0002] Generally, the powder metallurgy process used in the society usually goes through the processes of mixing-stirring-forming-sintering-shaping-secondary sintering-mechanical processing-heat treatment-oscillating grinding-vacuum oil immersion and other processes. As the country pays more and more attention to environmental protection, in the machinery industry, simplifying the process steps will save a lot of energy. However, in order to improve the efficiency of batch production, if the method of simplifying the formula and reducing the process steps is adopted, the efficiency of its manufacture can be greatly improved, such as the application number 200610051686.2 "Weldable Powder Metallurgy Bearing and Production Technology" (Notice No. CN1851280A) is exactly this type of design. In order to achieve the above-mentioned purpose, a ...

Claims

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Application Information

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IPC IPC(8): B22F3/16B22F3/26
Inventor 郑平龙朱飞高
Owner ZHEJIANG ZHONGPING POWDER METALLURGY
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