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Valve body forging technology

A valve body and process technology, which is applied in the field of valve body forging, can solve problems such as leakage, welding temperature is not as good as the original body temperature, and welding joints should crack, etc., and achieves the effects of simple process, improved product quality, and small material curve

Inactive Publication Date: 2017-06-13
浙江电泰阀业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There are two traditional forging processes. The first one uses split forging to separate the valve body and flange and forge them separately. After welding, the valve body and flange become a whole valve product. However, the disadvantage of other valves is that it is easy to produce The change of temperature difference during use will cause the welding place to crack and cause leakage, and the welding temperature is not as good as the original body temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A valve body forging process, comprising the following steps:

[0023] A, blanking: after blanking, carry out acidification treatment to remove the surface oxide layer;

[0024] B. Heating: Put the valve material into a gas heating furnace for heating treatment, and the temperature of the heating furnace is 1100°C;

[0025] C. Free forging; use air hammer in the heating furnace to freely deform the valve material in all directions between the upper and lower anvil surfaces to form the required blank shape, eliminate shrinkage cavity, shrinkage porosity, and pore defects. The free forging temperature is 1100°C;

[0026] D. Rough die forging: rough forging, the temperature is controlled at 800°C, and the blank is put into the mold for cold forging;

[0027] E. Fine die forging: the valve body after rough forging in step D is fine forged with a friction press, the precision is 0.8mm, and the fine forging temperature is controlled at 800°C;

[0028] F. Edge trimming: The ...

Embodiment 2

[0038] A valve body forging process, comprising the following steps:

[0039] A, blanking: after blanking, carry out acidification treatment to remove the surface oxide layer;

[0040] B. Heating: Put the valve material into a gas heating furnace for heating treatment, and the temperature of the heating furnace is 1250°C;

[0041] C. Free forging: In the heating furnace, the air hammer is used to freely deform the valve material in all directions between the upper and lower anvil surfaces to form the required billet shape, and eliminate shrinkage cavities, shrinkage porosity, and air hole defects. The free forging temperature is 1150°C;

[0042] D. Rough die forging: rough forging, the temperature is controlled at 900°C, and the blank is put into the mold for cold forging;

[0043] E. Fine die forging: the valve body after rough forging in step D is fine forged with a friction press, the precision is 0.9mm, and the fine forging temperature is controlled at 850°C;

[0044] F....

Embodiment 3

[0054] A valve body forging process, comprising the following steps:

[0055] A, blanking: after blanking, carry out acidification treatment to remove the surface oxide layer;

[0056] B. Heating: put the valve material into a gas heating furnace for heating treatment, and the temperature of the heating furnace is 1150°C;

[0057] C. Free forging: In the heating furnace, the air hammer is used to freely deform the valve material in all directions between the upper and lower anvil surfaces to form the required billet shape, and eliminate shrinkage cavities, shrinkage porosity, and air hole defects. The free forging temperature is 1110°C;

[0058] D. Rough die forging: rough forging, the temperature is controlled at 820°C, and the blank is put into the mold for cold forging;

[0059]E. Fine die forging: the valve body after rough forging in step D is fine forged with a friction press, the precision is 1mm, and the fine forging temperature is controlled at 820°C;

[0060] F. Ed...

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PUM

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Abstract

The invention discloses a valve body forging technology. The valve body forging technology includes the steps of A, blanking, B, heating, C, free forging, D, rough die forging, E, precision die forging, F, trimming, G, character pressing, H, thermal treatment and I, shot blasting. The valve body forging technology has the advantages that through adoption of a valve body lengthening end integrated forging technology, the problem that a welded position is prone to stress cracking during split forging is solved, and damage to material tissues due to forging squeezing in an integrated flange forging process is avoided.

Description

technical field [0001] The invention relates to the technical field of valve body forging, in particular to a valve body forging process. Background technique [0002] There are two traditional forging processes. The first one uses split forging to separate the valve body and flange and forge them separately. After welding, the valve body and flange become a whole valve product. However, the disadvantage of other valves is that it is easy to produce The change of temperature difference during use will cause the welding place to crack and cause leakage. In addition, the welding temperature is not as good as the original body temperature. The welding part is easy to be cracked by external force and cause leakage; the second type adopts integral flange forging. The damage to the structure, especially for the material of the dual phase steel, the damage to the metallographic structure is very serious. Contents of the invention [0003] The purpose of the present invention is...

Claims

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Application Information

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IPC IPC(8): B21K1/24B21J5/00B21J5/02C23C8/22C21D1/18F16K27/00
CPCB21K1/24B21J5/00B21J5/02C21D1/18C23C8/22F16K27/00
Inventor 杨选辰周道亮杨贤璋杨景程赵曾然王俊豪
Owner 浙江电泰阀业有限公司
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