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

A special-shaped surface and manufacturing method technology, applied in the field of special-shaped surface processing, can solve the problems of low manufacturing precision, large surface roughness value and high cost, and achieve the effects of reducing the amount of milling processing, improving processing efficiency, and reducing processing time.

Inactive Publication Date: 2012-11-14
CITIC HEAVY INDUSTRIES CO LTD
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  • Abstract
  • Description
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  • Application Information

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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.

Method used

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

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Embodiment Construction

[0094] The manufacturing method of the present invention is specifically described below by taking the main steam inlet nozzle processing steps as an example, as figure 1 , figure 2 , image 3 , Figure 4 As shown, the dimensions of the main steam inlet connecting pipe are as follows: the diameter of the brim 2 is 2100mm, the height is 622mm, the diameter of the inner circle 4 at the end of the hat mouth is 1190.4mm, the opening of the large end of the conical surface is 1400mm, and the wall thickness is 55mm; image 3 , Figure 4 , Figure 5 , Image 6 , Figure 7 , there are chamfers in the three directions of characteristic chamfering surfaces 20, 21, and 22 on the edge of the brim 2, and the chamfering surface 21 coincides with the large outer circle 8 of the brim end at the B-B section position; the end face 11 of the brim end is very narrow and has a slope The mouth surfaces 12 and 16 have the characteristics of deep grooves 14, and the inner circle 4 of the cap ...

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
Inventor 王继生张永红朱耀华胡滨
Owner CITIC HEAVY INDUSTRIES CO LTD
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