Valve body forging method

A valve body and forging technology, which is applied in the field of valve body manufacturing, can solve the problems of energy saving and consumption reduction, difficulty of full die forging, high manufacturing cost, etc., and achieve the effect of material saving, excellent mechanical properties and simple equipment

Active Publication Date: 2015-03-25
CHENGDU SHUANGLIU HENGSHENG FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process ensures the mechanical properties and surface quality of the valve body, it still needs to be improved in terms of saving the material used for the valve body. The material saved is only 1.2%, and the process is relatively complicated and the manufacturing cycle is long.
[0006] The internal quality and performance of the valve body produced by the ordinary die forging process can meet the requirements of the working conditions, but it has high requirements for the mold. Under the current trend of saving energy and materials, the middle part of the ordinary die forging valve body is mostly square. Cannot meet the requirements of energy saving and consumption reduction
Moreover, the customer may need a relatively large valve body. It is difficult to use full die forging for a large valve body, and the manufacturing cost is relatively high.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0052] The blanked 35CrMo alloy steel billet (420×320×260) is first freely forged with a 3T forging hammer to 410×310×250mm, the two ends are riveted and forged, and the indentation is divided into two ends, and the eccentricity is forged. , and then forge both ends into a 260° octagon, and use a pressing block to groove the part of the octagon close to the square with a length of 50mm to a length of 165×165×85mm to ensure that the end flange is 80mm long and the groove is 85mm long; then use up and down crimping The middle octagon is forged by means of dies. Be careful not to reverse the direction. Correct the middle square when buckling the octagon. Control the height of the middle square to 305mm and the width to 250mm to ensure a length of 250mm-260mm. After the middle square is forged in place, the flanges at both ends Control the height of the forging circle with spacers. Finally, the size of each part is corrected to the size shown in the forging drawing, and the flange...

Embodiment 2

[0056] The blanked 30CrMo alloy steel billet (420×320×260) is first freely forged to 410×310×250 with a 3T forging hammer, and the two ends are riveted and forged, and the indentation is divided to separate the two ends, and the eccentricity is forged. Then forge both ends into a 260° octagon, and use a pressing block to groove the part of the octagon close to the square with a length of 50mm to a length of 165×165×85mm to ensure that the length of the end flange is 80mm and the length of the groove is 85mm; then use the upper and lower crimping dies Forge the middle octagon in the same way, pay attention not to reverse the direction, correct the middle square when buckling the octagon, control the height of the middle square to 305mm and the width of 250mm, and ensure the length of 250mm-260mm; after the middle square is forged in place, use the flanges at both ends The spacer controls the height of forged circle. Finally, the size of each part is corrected to the size shown ...

Embodiment 3

[0060] The blanked 35CrMo alloy steel billet (620×520×460) is first freely forged with a 3T forging hammer to 610×510×450mm, the two ends are riveted and forged, and the indentation is divided into two ends, and the eccentricity is forged. , and then forge both ends into a 260° octagonal, use a pressing block to press the part of the octagonal 80mm long to 265×265×1055mm long, ensure that the end flange is 100mm long, and the groove is 105mm long; then use up and down crimping Forge the middle octagon by means of mold, pay attention not to reverse the direction, correct the middle square when buckling the octagon, control the height of the middle square to 405mm and the width of 350mm, and ensure the length of 350mm-360mm; Control the height of the forging circle with spacers. Finally, the size of each part is corrected to the size shown in the forging drawing, and the flanges at both ends are controlled on the same axis, and the eccentricity between the octagonal block in the...

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Abstract

The invention relates to the field of valve body manufacturing, in particular to a valve body forging method. The valve body forging method saves materials and energy and reduces consumption on the condition of meeting the requirement of customers for product diversification. At first, blank forming is achieved by utilizing free forging for executing the following steps of A, selecting round steel with the weight being 1.15-1.25 times the weight of a finished valve body, riveting the two ends of the round steel, conducting indentation material separation, and forging the round steel into the preset size; B, enabling the two ends of the round steel to get off a table, forging eccentricity of the middle and the two ends, and forging the two ends into 260-degree octagons; C, then utilizing pressing blocks for making octagonal pressure grooves in the two ends into the preset size, and ensuring that flanges and grooves of a green body are within the design size range. Then, final forming is achieved by adopting semi-die forging for executing the following steps of a, forging the middle octagon of the green body in a vertical die buckling and pressing mode; b, after the middle octagon is formed, controlling the height of the flanges at the two ends through cushion blocks and forging the flanges to be rounded; c, finally, trimming the sizes of all parts of the forged piece into the designed sizes.

Description

technical field [0001] The invention relates to the field of valve body manufacturing, in particular to a valve body forging method. Background technique [0002] Valve products are widely used in petroleum, chemical industry, nuclear power, metallurgy, electric power, hydraulic power, large coal chemical industry and other industries. With the transfer of oil development to inland oilfields and offshore oilfields, and the development of the power industry from thermal power below 300,000 kilowatts to thermal power, hydropower and nuclear power above 300,000 kilowatts, valve products should also change their performance and performance according to changes in equipment application fields. parameter. Oil and gas transmission projects are developing towards pipelines, which requires a large number of flat gate valves and ball valves. The other side of energy development is energy saving, so from the perspective of energy saving, it is necessary to develop steam traps, and de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/24
CPCB21K1/24
Inventor 胡林晏爽许莉李普任德俊
Owner CHENGDU SHUANGLIU HENGSHENG FORGING
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