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Manufacturing method of pressure-bearing equipment thick-wall seal head structure

A technology of pressure-bearing equipment and manufacturing methods, which is applied in the design and manufacture of thick-walled heads, can solve the problems of discontinuity, stress concentration, and irregularity of the outer surface of the head, and achieve the elimination of discontinuity of the outer surface and the reduction of ellipse degree of effect

Active Publication Date: 2019-01-11
HARBIN BOILER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For a long time, the thick-walled spherical heads or elliptical heads (referred to as heads) formed by hot pressing of pressure-bearing equipment such as boilers, pressure vessels, and nuclear power plants (referred to as heads), due to the phenomenon of thinning and thickening during the pressing process, the heads after forming are not Equal thickness, and the thickening of the ring seam groove is distributed on the outer surface. In order to ensure the thickness of the head ring seam groove, it is necessary to process the outer surface of the groove and the inclined transition, resulting in discontinuity and irregularity on the outer surface of the head. Poor surface quality is prone to stress concentration; however, due to the absence of thickening and machining allowance on the inner surface and the ellipticity of the head, the size of the inner groove is uneven and the deviation is too large, see Figure 1a , Figure 1b
As a result, the design structure and manufacturing technology of thick-walled heads of pressure equipment manufacturing enterprises are single and backward

Method used

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  • Manufacturing method of pressure-bearing equipment thick-wall seal head structure
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  • Manufacturing method of pressure-bearing equipment thick-wall seal head structure

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation is provided, but the protection scope of the present invention is not limited to the following embodiments.

[0022] image 3 The design specification of a spherical head is SR1225×125, which is a non-standard head, and 125 mm is the minimum thickness. The design requires a thickness of 135 mm for the annular groove and an outer diameter of 2720 mm for the annular groove; the thickness of the steel plate blank is 145 mm. The minimum wall thickness of the head product is 130 mm; the maximum wall thickness of the head due to pressing and thickening is 160 mm, which is 25 mm greater than the required thickness of the circular joint groove.

[0023] In the past, a certain head was hot-pressed on the whole plate, pressed and thickened ...

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Abstract

The invention provides a manufacturing method of a pressure-bearing equipment thick-wall seal head structure. The problem of the discontinuity of the outer surface due to outer surface and slope machining or transition is solved. The main technological process includes the steps that re-inspection of a steel plate is qualified; workblank blanking is carried out; heating is carried out; a head is hot-pressed; heat treatment is carried out; edging is carried out; the shape and position dimensions of an inner sphere are inspected by a template; turning of a circular seam groove 4 and an inner surface 1 is carried out, and slight turning and finishing for the groove outside surface are carried out; and thickness measuring is carried out. The outer surface of the seal head is smooth and continuous, the ovality of the inner surface after machining is decreased, the size of an internal groove is even, and the inner and outer surfaces of the seal head are of good quality.

Description

technical field [0001] The invention relates to the field of design and manufacture of thick-walled heads of pressure-bearing equipment such as boilers, pressure vessels, and nuclear power equipment, in particular to a method for manufacturing thick-walled heads of pressure-bearing equipment. Background technique [0002] For a long time, the thick-walled spherical heads or elliptical heads (referred to as heads) formed by hot pressing of pressure-bearing equipment such as boilers, pressure vessels, and nuclear power plants (referred to as heads), due to the phenomenon of thinning and thickening during the pressing process, the heads after forming are not Equal thickness, and the thickening of the ring seam groove is distributed on the outer surface. In order to ensure the thickness of the head ring seam groove, it is necessary to process the outer surface of the groove and the inclined transition, resulting in discontinuity and irregularity on the outer surface of the head. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 袁承春
Owner HARBIN BOILER
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