Profiling forging method of large cylinder forge piece provided with internal and external steps

A large cylinder and step technology, applied in the field of forging, can solve the problems of limited production feeding, unfavorable comprehensive performance of forgings, inconsistent wall thickness of forgings, etc., and achieve the effect of improving comprehensive mechanical properties, good internal and external quality, and meeting diameter requirements

CN105414430AActive Publication Date: 2016-03-23CHINA ERZHONG GRP DEYANG HEAVY IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-03-23

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Abstract

The invention discloses a profiling forging method of a large cylinder forge piece provided with internal and external steps. According to the profiling forging method of the large cylinder forge piece provided with the internal and external steps, raw material consumption and machining allowance can be reduced under the premise that internal quality is guaranteed. The profiling forging method comprises steps as follows: A, tongs hold is performed; B, rolling, drawing and blanking are performed; C, upsetting and punching are performed; D, a common mandrel is subjected to pre-reaming until a step saddle can penetrate into a forging stock; E, step saddle pre-drawing is adopted to enable an inner hole of the forging stock to form the step, an outer contour of the forging stock forms a step cylinder shape, and meanwhile, the length of the forging stock meets the technical processing size; F, the step saddle and a step reaming anvil are adopted for hole reaming forming. With the adoption of the profiling forging method, natural streamline of metal can be prevented from being cut off, so that fibers of the forge piece are continuous, and improvement of synthesized mechanical properties of the forge piece is facilitated.
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Description

technical field

[0001] The invention relates to forging technology, in particular to a profiling forging method of a large cylinder forging with internal and external steps. Background technique

[0002] It is known that large-scale cylinder forgings with inner and outer steps are used in nuclear power, petrochemical and deep-sea pressure vessels. Because the equipment is a forged-welded structure, the original design is to separate the flange and the cylinder body, and finally weld them together. With the increasing size of containers and the continuous improvement of technical requirements, it has become a consensus to minimize welds, which can improve the safety, reliability and service life of equipment, and at the same time reduce the in-service inspection of nuclear power and other products times and risks. Therefore, at present, the flange and the barrel section of this forging have been designed as a whole, thus forming a special large-scale barrel structure with do...

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] The profiling forging method of the large cylinder forging with inner and outer steps of the present invention comprises the following steps:

[0035] A. Pressing jaws; B. Rolling and elongating, blanking; C. Upsetting, punching; D. Using ordinary mandrel to pre-expand the hole until the stepped horse bar 2 can penetrate the forging blank 1; E. Using the stepped horse bar 2 Pre-drawing makes the inner hole of the forging billet 1 form a step, and makes the outer contour of the forging billet 1 into a stepped cylinder shape, and at the same time makes the length of the forging billet 1 conform to the processing size; F, adopt step horse bar 2 and step reaming Anvil 3 reaming and forming;

[0036] In step C, the upsetting and punching process of the forging billet 1 is divided into two fires: the first fire is to upset the end face of the flange s...