Integral forging and forming method for large-scale end socket forge piece of nuclear reactor with a plurality of protruding nozzles

Abstract

The invention belongs to the technical field of forge piece forging, and particularly relates to an integral forging and forming method for a large-scale end socket forge piece of a nuclear reactor with a plurality of protruding nozzles. A cylindrical blank is prepared through implementation of the processes of removal of a head and a tail of a steel ingot, drawing out of upsetting, rolling and blanking and the like, and moulding bed formation is implemented on the cylindrical blank by adopting a flat-anvil male-die subarea rotary rolling and forging method, so that filling forming of the shapes of the nozzles of a middle prefabricated slab is achieved through a free forging method by means of a moulding bed. According to the integral forging and forming method for the large-scale end socket forge piece of the nuclear reactor with the multiple protruding nozzles, the shape and the size of the prefabricated slab can be effectively controlled, metal of the prefabricated slab is reasonably dispersed, and the situations that the internal organization is even, forming process line is distinct, the fibrous structure is good, and the contour shape is intact are achieved. Hot stamping technology deformation belongs to the scope of large displacement and small strain in nature, and the needed press machine loading force is small; hot stamping integral forming is easy to control the shape of a big end socket forge piece product, the heat loss in the forming process of the big end socket forge piece product is small, the heating temperature of a blank is low, the time is short, so that finish-forging formed grains are controlled to grow up, and the product quality is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of forging forgings, and is suitable for the hot stamping integral forming process and manufacturing process of a large-scale pressure vessel with a plurality of protruding nozzles for a nuclear power equipment, specifically a large-scale forging of a nuclear reactor with a plurality of protruding nozzles. Integral forging forming method. Background technique [0002] As a stable, clean and high energy density energy, nuclear power plays an important role in adjusting the energy structure, improving the ecological environment and reducing carbon emissions. The head of the large pressure vessel of the nuclear island of the nuclear power plant is the most important pressure-bearing part in the main equipment of the nuclear power plant. It has the characteristics of complex shape, large outline size, heavy weight and structural integration. The standards are very strict. In addition to high performance and lon...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to solve the above-mentioned problems and provide a method for integrally forming head forgings of nuclear power equipment pressure vessels with large outer diameters and multiple protruding nozzles. There are technical problems such as easy cracking when using small punches, forming difficulties, unreasonable material flow, difficulty in guaranteeing product performance and quality, and large machining allowances when using small punches for rolling.

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