Method for manufacturing specially-shaped curved surface of main steam inlet and outlet connecting pipe

Abstract

The invention discloses a method for manufacturing a specially-shaped curved surface of a main steam inlet and outlet connecting pipe, and belongs to the technical field of machining of the specially-shaped curved surface. The method comprises stages of manufacturing and detecting product blanks and machining the shape of products, wherein the blanks which are qualified by nondestructive testing enter the step of machining the shape of the products; and the method specifically comprises the following steps of: solving the maximum profile of the appearance of the product according to two sections formed by connecting lines at the highest point and the lowest point of the product peaks along the circumferential direction; drawing a technical diagram; performing rough-turning according to the technical diagram; milling a stress release groove at the end of the peak; performing rough-turning on a curved surface region; reserving a technical table at the peak; performing semi-finish milling on the curved surface region and the technical table; performing semi-finish turning; performing finish-milling on the curved surface region and the technical table; performing finish-turning; milling the technical table and polishing by a fitter. The method fills the blank in the field of machining and manufacturing of the specially-shaped curved surface of the main steam inlet and outlet connecting pipe in China, the acquisition cost of the main steam inlet and outlet connecting pipe is reduced, and the development of the Chinese nuclear power equipment and the autonomation of the related technology are promoted.

Description

technical field [0001] The invention belongs to the technical field of special-shaped curved surface processing, and in particular relates to a method for manufacturing a special-shaped curved surface of a main steam inlet and outlet of a nuclear power plant. Background technique [0002] The main steam inlet and outlet connection is a special equipment for the MSR of the conventional island of the nuclear power plant. A nuclear power plant with a million kilowatts has four units, each unit consists of two MSRs, and each MSR has 8 main steam ports, that is, each million kilowatt nuclear power plant There are 64 main steam inlet and outlet pipes; however, the working environment of this part is harsh, the material is carbon-manganese steel, and the shape of the part is similar to a "western cowboy hat". There is no experience in processing such parts, and they have been imported from abroad. "The import price of each part is about 1.5 million, and each nuclear power plant will ...

AI Technical Summary

Problems solved by technology

Among them, the direct forming method is the main forming method for special-shaped cross-section parts, but due to its low manufacturing precision and large surface roughness value, it cannot meet the finishing requirements of special-shaped cross-section parts

The application of special processing methods is limited due to low efficiency, high cost and inability to process non-circular cross-section parts with complex axial cross-section shapes.

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