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Upper and lower pressing plates of automobile exhaust gas recirculation valve and preparation method of upper and lower pressing plates

A technology of exhaust gas recirculation valve and pressure plate, which is applied to other manufacturing equipment/tools, turbines, engine components, etc., can solve the problems of strict control of electrical steel composition, difficulty in meeting the demand of steel plates, irregular shape, etc., and achieve coercive The effect of small force, high hardness and high tensile strength

Active Publication Date: 2012-10-31
NINGBO RUIFENG AUTO PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the composition control of electrical steel is relatively strict, the manufacturing process is very long, and because the shape of the upper and lower pressure plates of the automobile exhaust gas recirculation valve is irregular and very complicated, it is difficult for the steel plate produced by the electrical steel production method to meet the demand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this embodiment, 0.8% zinc stearate is selected by weight percentage, and the balance is Laigang 100.29 water atomized iron powder. The particle size of Laiwu Steel 100.29 water atomized iron powder is 80 mesh. Mix the two evenly to form iron-based powder, and send the iron-based powder into the mold, press 6T / cm 2 The pressure is pressed and made into a product blank; the product blank is sent to a sintering furnace filled with hydrogen-nitrogen mixed gas for sintering, and the maximum sintering temperature is 1100°C. Present embodiment product performance is as follows: Apparent oily density: 7.2g / cm 3 , tensile strength: 250MPa, impact value: 5Kj / m 2 , the maximum permeability U max ≥3200, coercive force (A / m) ≤120, carbon content ≤0.1%.

Embodiment 2

[0027] In the present embodiment, 0.8% zinc stearate is selected by weight percentage, and the balance is 100.29% electrolytic iron powder. 100.29 The particle size of electrolytic iron powder is 100 mesh. Mix the two evenly to form iron-based powder, and send the iron-based powder into the mold, press 6T / cm 2 The pressure is pressed and made into a product blank; the product blank is sent to a sintering furnace filled with hydrogen-nitrogen mixed gas for sintering, and the maximum sintering temperature is 1160°C. The performance of the sintered product has been tested, and its performance is as follows: apparent oil density: 7.25g / cm3, tensile strength: 260MPa, impact value: 6Kj / m 2 , the maximum permeability U max ≥3300, coercive force (A / m) ≤110, carbon content ≤0.08%.

Embodiment 3

[0029] In the present embodiment, 0.6% zinc stearate is selected by weight percentage, and the balance is 100.29 Sweden Hegnas 100.29 atomized iron powder. Swedish Hegnas 100.29 atomized iron powder has a particle size of 120 mesh. Mix the two evenly to form iron-based powder, and send the iron-based powder into the mold, press 6T / cm 2 The pressure is pressed and made into a product blank; the product blank is sent to a sintering furnace filled with hydrogen-nitrogen mixed gas for sintering, and the maximum sintering temperature is 1200°C. The sintered product blank is pressed again at 7T / cm 2 Test the performance of the product after repressing and reburning at 1200°C. The performance is as follows: Apparent oil density: 7.45g / cm 3 , tensile strength: 300MPa, impact value: 8Kj / m 2 , the maximum permeability U max ≥3500, coercivity (A / m) ≤100, carbon content ≤0.06%.

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Abstract

The invention provides a preparation method of upper and lower pressing plates of an automobile exhaust gas recirculation valve, belonging to the technical field of preparation of automobile accessories and solving the problem of long manufacturing process of the conventional upper and lower pressing plates of the automobile exhaust gas recirculation valve. The preparation method of the upper and lower pressing plates of the automobile exhaust gas recirculation valve comprises the following steps of: proportioning, i.e., calculating and selecting 0.6-0.8 percent of zinc stearate and the balance of atomized iron powder in percentage by weight and uniformly mixing the two to form iron base powder, wherein the particle diameter of the atomized iron powder is 80-120 meshes; pressing, i.e., conveying mixed iron base powder into a mould and pressing according to 6-7 T / cm<2> and preparing a product blank; and sintering, i.e., conveying the product blank into a sintering furnace with inert gas for sintering, wherein the highest temperature of the sintering is 1,100-1,200 DEG C. According to the preparation method, the upper and lower pressing plates of the automobile exhaust gas recirculation valve are prepared by using a powder metallurgy method; and the preparation method has the advantages of simple and flexible process, no need of extra special device, high hardness, high tensile strength, high maximum magnetic conductivity and small coercive force.

Description

technical field [0001] The invention relates to an upper and lower pressing plate and a preparation method thereof, in particular to an upper and lower pressing plate of an automobile exhaust gas recirculation valve and a preparation method thereof. Background technique [0002] The upper and lower pressure plates of the automobile exhaust gas recirculation valve refer to the two steel plates used to open and close the exhaust valve during the exhaust gas emission process of the automobile. The existing upper and lower pressure plates of the automobile exhaust gas recirculation valve are prepared through the production method of electrical steel. Electrical steel refers to a soft magnetic alloy, which is mainly made of hot-rolled silicon steel or cold-rolled silicon steel. [0003] However, the composition control of electrical steel is relatively strict, the manufacturing process is very long, and because the shape of the upper and lower pressure plates of the automobile e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F5/00
Inventor 邬建尧
Owner NINGBO RUIFENG AUTO PARTS