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

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. ...

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

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