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Forging method for flange type ball valve cover

A flange type, ball valve technology, applied in the valve device and other directions, to achieve the effect of beautiful appearance and uniform metallographic structure

Inactive Publication Date: 2012-11-14
DALIAN DAGAO VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Flanged ball valves play a very important role in production, and the traditional manufacturing method of flanged ball valve bonnet is to adopt casting method to produce, because the valve The wall thickness of the body is relatively thin, and pores are prone to appear during the casting process. In the process of processing and pressure testing, about 30% of the product quality is found to be unqualified, and the product performance is also unstable, which has a great impact on the use of the valve.

Method used

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  • Forging method for flange type ball valve cover
  • Forging method for flange type ball valve cover
  • Forging method for flange type ball valve cover

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Embodiment Construction

[0025] The invention is now described in detail in conjunction with the accompanying drawings.

[0026] 1. Select the blank. According to the different cross-section of the product, the blank should be a round bar with a diameter of 95mm and a length of 590mm;

[0027] 2. Heating, heating the round bar, using a 500KW-1000HZ medium frequency induction electric heating furnace, the heating time is 45s, and the heating temperature range is 1150±50°C;

[0028] 3. The billet mold is made by using C41-75 air hammer. The temperature change during the operation should be figure 1 blanking mold shown;

[0029] 4. Manufacture the pre-forging mould, use the blank mold made in step 3 to manufacture, the temperature change will be figure 2 and image 3 Block block shown;

[0030] 5. For preforming, a C41-75 air hammer must be used to make the pre-forging die obtained in step 4 into a blank, such as Figure 4 As shown, the first preform blank is obtained, such as Figure 5 As shown, t...

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Abstract

The invention belongs to the field of forging technological development and manufacturing of valve parts, and particularly relates to a forging method for a flange type ball valve cover. The forging method for the flange type ball valve cover mainly comprises the following seven steps of: selecting a blank, heating, manufacturing a blank die, manufacturing a pre-forging die, pre-forming, finally forging to form and edging. With the adoption of the forging method provided by the invention, the ball valve cover is moulded through one-step hot die forging, so that the product quality is controlled well; the requirement on an appearance size of the product can be met after the edging step is carried out; the product has very good forging linearity; the internal gold-phase structure is uniform and compact; the ultrasonic wave crack detection nearly can entirely meet the requirement; and furthermore, the beautiful appearance is achieved.

Description

technical field [0001] The invention belongs to the field of forging technology development and manufacturing of valve parts, and in particular relates to a forging method of a flanged ball valve cover. Background technique [0002] Flanged ball valves play a very important role in production, and the traditional manufacturing method of flanged ball valve bonnets is produced by casting. Due to the relatively thin wall thickness of the valve body, pores are prone to appear during the casting process. During the process of processing and pressure testing, it was found that about 30% of the products were unqualified and the performance of the products was unstable, which had a great impact on the use of valves. Contents of the invention [0003] In order to solve the above problems and break through the traditional production process, the present invention provides a forging method for a flanged ball valve cover, which can produce a flanged ball valve with excellent forg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/02B21K1/20
Inventor 纪长全于长洪孙岳晨
Owner DALIAN DAGAO VALVE
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