Manufacturing method of gasket fixing clamp for reactor pressure vessel

Abstract

The invention discloses a manufacturing method of a gasket fixing clamp for a reactor pressure vessel. The manufacturing method comprises the following steps: (1) forging: forging and discharging a forge piece blank on a free forging press; (2) upsetting: upsetting, drawing and rounding by using an upper flat anvil and a lower flat anvil to form a cylindrical forge piece; (3) punching: punching an inner hole of the cylindrical forge piece by using a punch to obtain the cylindrical forge piece with the inner hole; (4) chambering: chambering an inner hole of the cylindrical forging blank into two sections of horn holes with different calibers by using an upper anvil and a core rod; (5) performing; and (7) forming. According to the manufacturing method, thin annular forgings of different materials and different sizes can be forged, then the forgings are cut into parts of different radians, the fiber directions of the forgings are distributed along with the shape, the forgings are complete, safe and reliable, the forgings have the characteristics of high temperature resistance, high pressure resistance and corrosion resistance, machining excess materials are small, materials are saved, the machining period is short, and the manufacturing cost is low.

Description

technical field [0001] The invention belongs to the technical field of nuclear power equipment manufacturing, and in particular relates to a manufacturing method of a gasket fixing clip for a reactor pressure vessel. Background technique [0002] The gasket fixing clip is a structural member used for fixing the pressure vessel of a nuclear power reactor, and has very high requirements for its high temperature resistance, high pressure, corrosion resistance, low internal defects and comprehensive mechanical properties. The traditional manufacturing method of the washer clamp is generally to forge a thicker forging, and then form it by milling the upper and lower 45° arc surfaces and turning the excess internal allowance; or by die forging. At present, the products produced by forging are cut off due to the internal fiber direction of the forging, which not only reduces their comprehensive mechanical properties and service life, but also requires a lot of time for machining du...

AI Technical Summary

Problems solved by technology

At present, the products produced by forging are cut off due to the fiber direction inside the forging, which not only reduces their comprehensive mechanical properties and service life, but also requires a lot of time for machining due to the large machining allowance, and also causes waste of raw materials; However, the die forging method is used for forming. Firstly, due to the large size of the parts, the requirements for the die forging press equipment are high, and the equipment with a small tonnage cannot be formed by die forging.

Both of these methods use mechanical processing to remove excess metal, which results in large machining allowances, long processing cycles, large waste of materials, and high manufacturing costs.

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