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A Method for Hot Spinning Forming Head of Large Thick-walled Cylindrical Blank

A technology of hot spinning and thick-walled cylinders, which is applied to the overall manufacture of super-large head forgings and the field of hot-spinning large-scale thick-walled cylindrical blanks to form heads, and can solve problems such as difficulties in forging large-scale thick-walled head forgings , to achieve the effect of reducing stitching welds, reducing placement space, and reducing manufacturing costs

Active Publication Date: 2016-08-17
TIANJIN HEAVY EQUIP ENG RES +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem of difficult overall forging and forming of large thick-walled head forgings, the present invention provides a process method for hot-spinning large-scale thick-walled cylindrical blanks to form heads. Integral manufacture of head forgings

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  • A Method for Hot Spinning Forming Head of Large Thick-walled Cylindrical Blank
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  • A Method for Hot Spinning Forming Head of Large Thick-walled Cylindrical Blank

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Embodiment Construction

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] The present invention adopts a process method of hot spinning forming a large-scale thick-walled cylindrical blank to realize the sealing head through the following steps:

[0030] (1) Prepare a thick-walled cylindrical blank with an outer diameter of D, an inner diameter of d, and a wall thickness of t, wherein D>Φ4000mm, t=0.5(D-d)>80mm, and divide the blank into clamping sections along the length 1 and closing deformation section 2.

[0031] (2) Only heat one end of the closed deformation section 2 of the cylindrical billet to the austenite transformation temperature Ac 3 above.

[0032] (3) Heat the closing deformation section 2 to Ac 3 Afterwards, the clamping section 1 is clamped on the spinning machine fixture 3, and the centerline of the cylindrical blank is kept coincident with the centerline of the spindle of the s...

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Abstract

The invention discloses a method for forming end enclosure of a large-sized thick-wall cylindrical blank in a hot spinning manner, which is suitable for integrally manufacturing a large-sized end enclosure forge piece with the wall thickness being greater than 80mm and the diameter being greater than 4,000mm. The method comprises the following steps of (1) heating a deformation section of the cylindrical blank to the temperature more than the austenite transformation temperature; (2) clamping and fixing the blank onto a spinning machine; (3) hot spinning the blank which rotates along with a main shaft of the spinning machine for multiple passes through the matching of an inner roller and an outer roller, and controlling the wall thickness size and the shape of the end enclosure forge piece by adjusting the gap between the inner roller and the outer roller and the movement locus of the inner and outer rollers. By adopting the method, the procedure for forging the cake-shaped blank by utilizing a press machine can be avoided, the traditional procedure for stamping and molding the cake-shaped blank in a mold can be avoided, no special stamping mold is needed, and the method is suitable for integrally manufacturing the large-sized end enclosure forge piece.

Description

technical field [0001] The invention relates to a process method for hot-spinning a large-scale thick-walled cylindrical blank to form a head, and is especially suitable for the overall manufacture of a super-large head forging with a wall thickness greater than 80 mm and a diameter greater than 4000 mm, and belongs to the technical field of large-scale casting and forging. Background technique [0002] With the rapid development of petrochemical and nuclear power industries, the specifications of large pressure vessels are gradually increasing. As one of the key parts of large pressure vessels, the head is a large thick-walled part, its size increases with the increase of the pressure vessel specification, and the manufacturing difficulty also increases. At present, the commonly used manufacturing process of large thick-walled head forgings mainly includes the following steps: (1) using a press to prepare a round cake-shaped blank by free forging; (2) machining the round ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D22/14
Inventor 吴生富赵玲玲刘颖刘凯泉
Owner TIANJIN HEAVY EQUIP ENG RES
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