Manufacturing method for hot arc bent pipe of AP1000 nuclear power main pipeline

Abstract

The invention discloses a manufacturing method for a hot arc bent pipe of an AP1000 nuclear power main pipeline. A horizontal numerical control boring-milling machine is adopted, a lengthened cutter row is taken as a cutter of a machine tool, and processing comprises pipe bending of a short straight pipe section, a long straight pipe section and a bent pipe section. The processing process comprises the following steps of: I, processing a straight pipe section in a boring-milling way; and II, processing a bent pipe section. In a procedure 1, the inner wall of the bent pipe section is processed by separately processing an upper half oval and a lower half oval; and in a procedure 2, the outer wall of the bent pipe section is processed. In the invention, the inner wall of the bent pipe section is processed by adopting a half-long-axis semi-oval section planetary milling method, i.e., a rule is found from a variant oval section and is used for performing imitation processing on a bent pipe, so that machining of the bent pipe is realized, and the problem of difficulty in machining the bent pipe is solved.

Description

Technical field [0001] The invention relates to a metal cutting machining process, in particular to a method for manufacturing an AP1000 nuclear power main pipeline hot section bend. Background technique [0002] With the development of nuclear power, the requirements for nuclear power equipment continue to increase. The third-generation nuclear power technology-Westinghouse’s AP1000 nuclear power plant is currently the world’s most advanced nuclear power plant with a power of 100 megawatts and a design service life of 60 years. [0003] The main pipeline is one of the ten main equipments of a nuclear power plant and the main component of the primary circuit of the nuclear reactor of a nuclear power plant. The main pipeline connects the pressure vessel of the nuclear reactor and the main pump of the evaporator to form a loop loop. The heat generated by the nuclear reactor pressure vessel is transferred from the medium to the evaporator through the hot section of the main pipeline...

AI Technical Summary

Problems solved by technology

[0008] For the third-generation nuclear power products with higher design requirements, the blank is required to be a forging, the diameter is larger than the previous AP600, the length is longer, and the curvature of the arc is 56.4°. The manufacturing method of substitute products is difficult to meet the requirements (even impossible). At present, there is no unit in the world that can cold or hot bend such a large-diameter pipe. At most, it can only bend the approximate shape and size. for finishing

The selection of machine tools and cutting tools is also a major difficulty, and accurate calculations must be carried out, especially the processing of the inner side of the bent pipe is very difficult

The processing of the pipe is a challenge for the current international processing technology

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