Ultra-large type head plate integral pressing and molding technology and safe shell sealing head

Abstract

The invention relates to molding technology of a safe shell head plate which is a nuclear power station device, which belongs to the technical field of nuclear power safety device processing. The ultra-large type head plate integral pressing and molding technology comprises the following steps: steel plate flame cutting for blanking, steel plate heating and heat preservation, steel plate discharging and overhead hoisting, steel plate pressing, steel plate pressure releasing and overhead hoisting, steel plate measurement by a robot and nozzle processing. The safe shell sealing head is made of carbon-silicon-manganese materials SA738B, each steel plate which can form the sealing head has the length of about 10 m, the width of 4 m and the thickness of 41.3 mm, and the molded sealing head has the inner diameter of about 40 m and the height of about 11 m and is totally divided into four layers. The ultra-large type head plate integral pressing and molding technology can replace the prior graded pressing and point-pressing technology, increases production efficiency, prolongs the service life of workpieces and realizes the integral mould pressing and once molding of an ultra-large type ellipsoid head plate of a steel safe shell container of an AP1000 pressure water reactor nuclear power station.

Description

1. Technical field [0001] The present invention relates to a nuclear power plant equipment—a press forming process of steel containment, especially the integral pressing of the head plate of steel containment, an important equipment of the passive safety guarantee system of the third-generation nuclear power AP1000 advanced pressurized water reactor nuclear power plant. The forming process belongs to the technical field of nuclear power safety equipment processing. 2. Background technology [0002] At present, nuclear power is an economical, safe, reliable and clean new energy. The pressurized water reactor nuclear power plants in operation in the world are mainly of the second generation or second generation semi-reactor type. my country has introduced passive third-generation nuclear power technology from the Westinghouse Corporation of the United States—the AP1000 large-scale advanced pressurized water reactor, which represents the most advanced nuclear power technology ...

AI Technical Summary

Problems solved by technology

[0006] The APWR pressurized water reactor CV vessel designed and manufactured by Japan's Mitsubishi Heavy Industries has the same volume as the AP1000 pressurized water reactor CV vessel, and the size of the petals that make up the vessel is also the same. The difference from the manufacturing process of the AP1000 pressurized water reactor CV vessel is that it adopts SA516 Grade 70 Material and segmental molding and point pressure correction technology. The mold size required for this pressing process is small, and ordinary presses can fully meet the process requirements. After segmental pressing of large plates, the joints are gradually trimmed. This process The production efficiency is low, operators and technicians must have considerable work experience and technical accumulation, and sharp points are likely to occur at the segmented joints, which affects the service life of the workpiece, and requires a high technical level of workers

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