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Flange ball valve body forging technology

A flange type, ball valve technology, applied in the direction of the valve device, etc., to achieve the effect of good product quality control, uniform internal metallographic structure, and good forging streamlines

Inactive Publication Date: 2013-08-28
DALIAN DAGAO VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the defects in the forging technology of the existing flanged ball valve cover, the present invention breaks through the traditional production process. The flanged ball valve body is produced by forging, and the flange and the valve body are integrally forged. Hot die forging, upsetting round steel, then preforming, after final forging and forging, trimming to meet the product's shape and size requirements, the product has an excellent forging flow line, and the product quality is well controlled , the internal metallographic structure is uniform and dense, and the ultrasonic flaw detection is almost 100% to meet the requirements, and the appearance is beautiful

Method used

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  • Flange ball valve body forging technology
  • Flange ball valve body forging technology
  • Flange ball valve body forging technology

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Embodiment Construction

[0026] Technical solution of the present invention is:

[0027] 1. Selection of billet

[0028] For better forging and forming, the forming process is determined as follows: according to the change of different cross-sections of this product, a round bar with a diameter of 80 is selected as the raw material;

[0029] 2. Intermediate frequency induction furnace GRT120 intermediate frequency heating, heating time 45s material heating temperature 1150±50°;

[0030] 3. Use C41-75 to make the blank, the purpose is to remove the scale and preform;

[0031] 4. use figure 1 The blank-making mold shown is used for blank-making;

[0032] 5. use figure 2 The pre-forging die shown is used for pre-forming;

[0033] 6. Use image 3 The pre-forging die shown is for terminal forming, and the terminal forming temperature is ≥1000°C;

[0034] 7. use Figure 4 The final forging die shown is trimmed, and the trimming temperature is ≥950°C;

[0035] 8. Use an angle grinder to remove resi...

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Abstract

The invention discloses a flange ball valve body forging technology, and relates to a forging technology and production of valve parts. The flange ball valve body forging technology is characterized in that a flange ball valve body is produced by a forging method; a flange and a valve body are integrally forged; the ball valve body is subjected to one-time hot die forging; round steel is subjected to upsetting forming and performing; and after finish forging, the flange ball valve body is trimmed to meet the requirement of the product on the dimension. A special preforming method is adopted, a round rod is preformed, a forge piece can be well filled in a cavity in the forming process, and defects that a material is not filled in the cavity, and the like are effectively avoided, so that the yield of the product is obviously improved; and the product has an excellent forging flow line, the product quality is well controlled, the inside metallographic structure is uniform and compact, and the product almost meets the requirements by 100 percent through ultrasonic flaw detection, and has an attractive appearance.

Description

technical field [0001] The invention relates to a forging technology and production of a valve part, in particular to a forging technology of a flanged ball valve body. Background technique [0002] The traditional method of flange ball valve body is to adopt casting method to produce. During the process of processing and pressure test, it is found that about 30% of the products are unqualified in quality, and the product performance is also unstable, which has a great impact on the use of the valve. Contents of the invention [0003] In order to solve the defects existing in the forging technology of the existing flanged ball valve bonnet, the present invention breaks through the traditional production process, the flanged ball valve body is produced by forging, the flange and the valve body are integrally forged, and the ball valve body is produced once Hot die forging, upsetting round steel, then preforming, after final forging and forging, trimming to meet the product'...

Claims

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Application Information

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IPC IPC(8): B21K1/24
Inventor 纪长全徐悦波孙岳晨
Owner DALIAN DAGAO VALVE
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