Processing method for crossed forged piece for supporting ITER magnet

Abstract

The invention relates to a processing method for a crossed forged piece for supporting an ITER magnet. The processing method comprises the following steps: 1) manufacturing a set of moulds used for upset-extruding and forming; 2) getting and processing an alloy ingot into ring-shaped blank; 3) assembling the moulds; 4) putting the blank into the moulds, and utilizing a hydraulic press to carry out upset-extruding on the blank to obtain crossed ring blank; 5) manufacturing a second outer mould and an inner mould used for milled ring processing; 6) carrying out milled ring rolling on the crossed ring blank, and processing the crossed ring blank to obtain a crossed ring part; 7) splitting the crossed ring part in a height direction, controlling the hydraulic press to press by enabling a core rod to pass through an inner hole of the crossed ring part, and gradually expanding the crossed ring part into the crossed forged piece; and 8) leveling the crossed forged piece by use of a leveling machine, and finally obtaining the crossed forged piece which is in the shape of a flat plate, and is symmetrically provided with bulges at two sides.

Description

technical field [0001] The invention relates to a processing method for a cross-shaped forging supported by an ITER magnet, belonging to the technical field of forging. Background technique [0002] Involved in the ITER (International Thermonuclear Experimental Reactor) project is a large cross-shaped forging, which is made of 316N austenitic stainless steel and is used to support the key components of the magnet. It is structured like figure 1 , figure 2 As shown, the main body of the cross-shaped forging 16 is a flat plate structure, and protrusions are symmetrically arranged on both sides of the flat plate structure, so the cross-section of the cross-shaped forging 16 is cross-shaped. Since the cross-shaped forging 16 is irregular in shape, long in length, thin in thickness, and requires a high grain size, forging is very difficult. [0003] For the cross-shaped forging, there are currently two conventional processing methods as follows: [0004] Method 1: Forging in...

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Problems solved by technology

[0006] There are obvious problems in the above two methods: Method 1 has a large forging allowance, wastes materials, and takes a long time for machining. In addition, due to the thinner thickness, the machining stress is greater during machining, and the product is easily deformed.

The problem with the second method is that the deformation of the cross-shaped part is small, and there is a large tensile stress during the elongation process. The cross-shaped rib part cools quickly and is prone to cracking. At the same time, due to the material of the cross-shaped part and the materials on both sides Inconsistent flow conditions, prone to irregularities in the end face of forgings

Furthermore, method 2 also has the same problems as method 1, such as large forging allowance and processing deformation.

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