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A valve body forging process

A valve body and process technology, which is applied in the field of valve body forging, can solve problems such as single, difficult to achieve thorough cleaning, lack of toughness of forged products, etc., and achieve the effect of improving product quality, quality, strength and toughness

Active Publication Date: 2021-03-16
WENZHOU ZHONGHAI VALVE FORGING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The surface of the valve body of various materials needs to be treated before forging, so as to avoid the rust and scale on the surface from affecting the later processing. The effect of thorough cleaning; at the same time, during the forging process, the temperature does not change much, so that the forged product lacks toughness

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] S1, band saw blanking: first check and confirm the quantity and overall size of the round bar for processing, and use a horizontal band saw for blanking. The maximum cross-sectional width and height of the horizontal band saw are 400*350mm, and then the support The material rack is adjusted to be consistent with the height of the workbench to improve the accuracy of the blanking size;

[0024] S2, surface cleaning: first, the surface of the above-mentioned cut round bar is polished and derusted by a milling machine, and the surface is treated once to remove the rust on the surface, and then the round bar is pickled, and the surface is treated twice to remove residual rust Oxide;

[0025] S3, electric furnace heating: use a box-type electric furnace with a rated temperature of 1300°C to heat the round bar in stages. The specific steps are: first, preheat in a medium-temperature electric furnace, and ...

Embodiment 2

[0030] A valve body forging process, comprising the following steps:

[0031] S1, band saw blanking: first check and confirm the quantity and overall size of the round bar for processing, and use a horizontal band saw for blanking. The maximum cross-sectional width and height of the horizontal band saw are 400*350mm, and then the support The material rack is adjusted to be consistent with the height of the workbench to improve the accuracy of the blanking size;

[0032] S2, surface cleaning: first, the surface of the above-mentioned cut round bar is polished and derusted by a milling machine, and the surface is treated once to remove the rust on the surface, and then the round bar is pickled, and the surface is treated twice to remove residual rust Oxide;

[0033] S3, electric furnace heating: use a box-type electric furnace with a rated temperature of 1300°C to heat the round bar in stages. The specific steps are: first, preheat in a medium-temperature electric furnace, and ...

Embodiment 3

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

[0039] S1, band saw blanking: first check and confirm the quantity and overall size of the round bar for processing, and use a horizontal band saw for blanking. The maximum cross-sectional width and height of the horizontal band saw are 400*350mm, and then the support The material rack is adjusted to be consistent with the height of the workbench to improve the accuracy of the blanking size;

[0040] S2, surface cleaning: first, the surface of the above-mentioned cut round bar is polished and derusted by a milling machine, and the surface is treated once to remove the rust on the surface, and then the round bar is pickled, and the surface is treated twice to remove residual rust Oxide;

[0041] S3, electric furnace heating: use a box-type electric furnace with a rated temperature of 1300°C to heat the round bar in stages. The specific steps are: first, preheat in a medium-temperature electric furnace, and ...

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PUM

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Abstract

The invention discloses a valve body forging process which comprises the following steps: S1, band saw blanking: first, checking and confirming quantity and boundary dimension of round bars for processing, carrying out blanking by using a horizontal band saw, wherein the maximum cross section width and height of the horizontal band saw are ranged at 400*350 mm, and then adjusting a carrier rack tobe consistent with the height of a worktable, wherein the blanking dimension precision is improved; S2, surface cleaning: first polishing and derusting the surfaces of cut round bars by means of a milling machine for primary surface treatment to remove rust on the surfaces, and then pickling the round bars for secondary surface treatment to remove oxide skin left on the surfaces of the round bars; S3, electric furnace heating: heating the round bars in stages by using an oven type electric furnace at a rated temperature of 1300 DEG C; and S4, upsetting pre-treatment: upsetting the round barsby using an air hammer, the weight of the falling part of which is 750 kg, to change the shapes of the round bars. The valve body forging process is relatively good in cleaning effect to surfaces of the round bars, improves the forging quality of a valve body and is better in forging effect by way of staged heating.

Description

technical field [0001] The invention relates to the field of valve body forging, in particular to a valve body forging process. Background technique [0002] The valve body is a major part of the valve; there are different mechanical manufacturing methods according to the pressure level, such as casting, forging, etc. The valve body of the medium and low pressure specifications is usually produced by casting process, and the valve body of the medium and high pressure specifications is produced by forging Process production, the valve body, the valve core and the valve seat sealing ring can effectively withstand the medium pressure after forming a seal together; the material of the valve body is selected according to different process media. Different metal materials, commonly used materials are: gray cast iron, ductile iron and carbon plain steel etc. Among them, gray cast iron valves are used in various fields of industry due to their low price and wide application range. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/00B21J1/06B21K1/24
CPCB21J1/06B21J5/002B21K1/24
Inventor 杨选中杨聪
Owner WENZHOU ZHONGHAI VALVE FORGING CO LTD