Forging forming process of large thick-walled head with support and nozzle

Abstract

The invention discloses a forging forming process for a large thick-wall end socket with a bearing and a nozzle, wherein the forging forming process can be used for achieving one-shot integral forging forming of an end socket body, the bearing and the nozzle. The forming process comprises the steps that firstly, a lower profiling die and an upper forging male die are manufactured according to the boundary dimension of the to-be-produced large thick-wall end socket with the bearing and the nozzle; secondly, a blank is forged completely and compacted, a square chamfered blank is formed in a forged mode, the square blank is placed in the lower profiling die, and the bearing and the long nozzle are formed by a metal filling cavity through loose tooling forging; thirdly, the end socket body is formed in a hot spinning mode through the upper forging male die. By the adoption of the forming process, production efficiency can be improved, the production cycle can be shortened, and manufacturing cost can be lowered. Meanwhile, due to one-shot forging forming, metal fibers of the formed large thick-wall end socket with the bearing and the nozzle are continuous; the number of stress concentration positions in the end socket body is small; thus, comprehensive mechanical properties of the bearing, the nozzle and the end socket body of the large thick-wall end socket with the bearing and the nozzle are improved.

Description

technical field [0001] The invention relates to an overall manufacturing method of a large thick-walled head forging; in particular, a forging forming process of a large thick-walled head with supports and nozzles. Background technique [0002] It is known that with the development of nuclear power and petrochemical industry, the size of the required pressure vessel is getting bigger and bigger, the performance requirements are getting higher and higher, and more witness test plates are required on the body. Witness documents refer to the fact that in order to verify the consistency of the base material and weld quality of the product with the operation process determined by the process evaluation, the production process needs to carry out necessary physical, chemical and mechanical experiments on it. In order to avoid destructive experiments on the product, often The test piece prepared by using the same chemical composition, process, process system and process method as th...

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Problems solved by technology

[0004] The above two methods have their own advantages and disadvantages. The existing method of profile forging is to prefabricate (process after forging) a slab with a support block protrusion before forming the head, and then use a common forming die for deep drawing. Although this method can solve the manufacturing problem of heads with partial support blocks, the deformation resistance of the nozzle is very large during deep drawing, and it is difficult to solve the problem of forming long nozzles

At the same time, it is necessary to design and manufacture complex and expensive special molding dies before forging, and the technical risk is relatively large

[0005] The processing and forming method requires a larger steel ingot, and the utilization rate of the steel ingot is at least twice that of the profiling scheme. The subsequent heat treatment cycle is long and the amount of mechanical processing is large. It is difficult to compact, how to meet the strict non-destructive testing requirements is an important issue that needs to be solved when designing the forging process

In addition, in this method, after the head is formed, the support block is processed by cutting, which causes the discontinuity of the metal fiber at the support block, which directly affects the mechanical performance index of the product, and at the same time makes the surrounding defects Exposure, reduced safety factor

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