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Valve body forging process

A valve body and process technology, applied in the field of valve body forging, can solve the problems of lack of toughness, singleness, and difficulty in complete cleaning of forged products, and achieve the effects of improving strength and toughness, improving the quality of finished products, and improving quality.

Active Publication Date: 2019-12-06
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 includes the following steps:

[0023] S1, band saw cutting: first check and confirm the quantity and dimensions of the round bars used for processing. Use a horizontal band saw for cutting. The maximum cross-sectional width and height range of the horizontal band saw is 400*350mm. The material rack is adjusted to the height of the worktable to improve the accuracy of the blanking size;

[0024] S2, surface cleaning: firstly use a milling machine to polish and remove rust on the surface of the cut round bar, perform a primary surface treatment to remove the rust on the surface, and then pickle the round bar, do a secondary surface treatment to remove the residual surface Oxide;

[0025] S3, electric furnace heating: a box-type electric furnace with a rated temperature of 1300℃ is used to heat the round bars in stages. The specific steps are: first preheat in a medium-temperature electric furnace, hold for 55 minutes after reaching 860℃, and then i...

Embodiment 2

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

[0031] S1, band saw cutting: first check and confirm the quantity and dimensions of the round bars used for processing. Use a horizontal band saw for cutting. The maximum cross-sectional width and height range of the horizontal band saw is 400*350mm. The material rack is adjusted to the height of the worktable to improve the accuracy of the blanking size;

[0032] S2, surface cleaning: firstly use a milling machine to polish and remove rust on the surface of the cut round bar, perform a primary surface treatment to remove the rust on the surface, and then pickle the round bar, do a secondary surface treatment to remove the residual surface Oxide;

[0033] S3, electric furnace heating: a box-type electric furnace with a rated temperature of 1300℃ is used to heat the round bars in stages. The specific steps are as follows: first preheat in a medium temperature electric furnace, hold for 58 minutes after reaching 875℃,...

Embodiment 3

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

[0039] S1, band saw cutting: first check and confirm the quantity and dimensions of the round bars used for processing. Use a horizontal band saw for cutting. The maximum cross-sectional width and height range of the horizontal band saw is 400*350mm. The material rack is adjusted to the height of the worktable to improve the accuracy of the blanking size;

[0040] S2, surface cleaning: firstly use a milling machine to polish and remove rust on the surface of the cut round bar, perform a primary surface treatment to remove the rust on the surface, and then pickle the round bar, do a secondary surface treatment to remove the residual surface Oxide;

[0041] S3, electric furnace heating: a box-type electric furnace with a rated temperature of 1300℃ is used to heat the round bars in stages. The specific steps are: first preheat in a medium temperature electric furnace, after reaching 890℃, holding for 58 minutes, and th...

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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 main part of the valve; according to the pressure level, there are different mechanical manufacturing methods, such as casting, forging, etc. The valve body of medium and low pressure specifications is usually produced by casting process, and the valve body of medium and high pressure specifications is forged Process production, the valve body, valve core and valve seat sealing ring can effectively withstand medium pressure after forming a seal; the material of the valve body is selected according to different process media, and different metal materials are selected. Common 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 range of applications. They are usually used in the case...

Claims

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Application Information

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