Welding mould and method for processing high-accuracy square zirconium alloy element box

A technology for welding molds and zirconium boxes, which is applied in the field of mechanical processing, can solve the problems of long processing time, low processing accuracy, large overall twisting amount of zirconium box and large bending amount of sickle, etc., and achieves the effect of short processing time and high precision

Active Publication Date: 2010-12-08
国核宝钛锆业股份公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process route is the first at home and abroad, and the processing accuracy meets the requirements for the use of 5MW cryogenic reactors, it has the following disadvantages: the processing accuracy of the zirconium box is still limited, especially due to the large drawing force and incomplete alignment , resulting in large overall torsion and sickle bending (shape tolerance) of the zirconium box, and low processing accuracy; multiple sets of drawing dies and special machine tools are used, and the processing time is long, resulting in high cost and not suitable for mass production.
However, from these technologies, there is no specific method of bending and forming, and there is no method to improve the accuracy of the zirconium box

Method used

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  • Welding mould and method for processing high-accuracy square zirconium alloy element box
  • Welding mould and method for processing high-accuracy square zirconium alloy element box
  • Welding mould and method for processing high-accuracy square zirconium alloy element box

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Select a zirconium plate with a thickness of 2.2mm and a roughness of ≤3.2μm that meets the requirements, and use a CNC shearing machine to cut the zirconium plate and finish milling to obtain two zirconium plates after fine milling; the verticality deviation between the adjacent sides of the zirconium plate Less than 0.3mm; take the two zirconium plates after precision milling, and use a CNC bending machine to bend the two zirconium plates into a U-shaped zirconium groove, and the positioning mold accuracy is ±0.01mm. For bending, the forming speed is 80mm / min, the gap between the upper and lower dies is 2.0mm, the load is 50 tons, the holding time is 5 seconds, the fillet radius of the bending punch is 6mm, and the springback is 0.6°; the two U U-shaped zirconium groove uses welding tooling to connect the notches of two U-shaped zirconium grooves to assemble a square zirconium alloy component box. The length L of the square zirconium alloy component box is 1100mm, and ...

Embodiment 2

[0069]Select a zirconium plate with a thickness of 2.3mm and a roughness of ≤3.2μm that meets the requirements, and use a CNC shearing machine to cut the zirconium plate and finish milling to obtain two zirconium plates after fine milling; the verticality deviation between the adjacent sides of the zirconium plate Less than 0.3mm; take the two zirconium plates after precision milling, and use a CNC bending machine to bend the two zirconium plates into a U-shaped zirconium groove, and the positioning mold accuracy is ±0.01mm. For bending, the forming speed is 120mm / min, the gap between the upper and lower dies is 3.0mm, the load is 80 tons, the holding time is 20 seconds, the fillet radius of the bending punch is 6mm, and the springback is 1°; the two U U-shaped zirconium groove uses welding tooling to connect the notches of two U-shaped zirconium grooves to assemble a square zirconium alloy component box. The length L of the square zirconium alloy component box is 1100mm+1mm, a...

Embodiment 3

[0071] Select a zirconium plate that meets the requirements with a thickness of 2.25mm and a roughness of ≤3.2μm, and use a CNC shearing machine to cut the zirconium plate and finish milling to obtain two zirconium plates after fine milling; the verticality deviation between the adjacent sides of the zirconium plate Less than 0.3mm; take the two zirconium plates after precision milling, and use a CNC bending machine to bend the two zirconium plates into a U-shaped zirconium groove, and the positioning mold accuracy is ±0.01mm. For bending, the forming speed is 100mm / min, the gap between the upper and lower dies is 2.5mm, the load is 60 tons, the holding time is 10 seconds, the fillet radius of the bending punch is 6mm, and the springback is 0.8°; the two U U-shaped zirconium groove uses welding tooling to connect the notches of two U-shaped zirconium grooves to assemble a square zirconium alloy component box. The length L of the square zirconium alloy component box is 1100mm-1m...

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Abstract

The invention discloses a welding mould. A zirconium box pressing structure is arranged outside a zirconium box supporting structure; U-shaped zirconium grooves to be welded are arranged between the zirconium box pressing structure and the zirconium box supporting structure; positioning mechanisms are arranged on both end surfaces of the zirconium box pressing structure; zirconium box surface protection devices are arranged between the U-shaped zirconium grooves and the zirconium box pressing structure; and mould assembling and disassembling mechanisms are arranged on both end surfaces of the zirconium box pressing structure and the zirconium box supporting structure. The invention also discloses a processing method of a high-accuracy square zirconium alloy element box, comprising the following processing steps of: selecting a zirconium plate, and rechecking property; blanking the zirconium plate; bending for forming; welding and carrying out vacuum heat treatment shape correction by utilizing the welding mould; and carrying out surface treatment. The invention butts rabbets of the two U-shaped zirconium grooves by adopting the purpose-made welding mould, thereby assembling the square zirconium alloy element box; and in addition, the manufactured square zirconium alloy element box has high accuracy, short processing time and suitability for large batch production.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and relates to a welding mold, and also relates to a method for processing a high-precision square zirconium alloy element box by using the welding mold. Background technique [0002] In order to ensure that the fission products of the fuel rods do not overflow the contamination circuit during the operation of the nuclear reaction, they must be isolated and wrapped. The zirconium alloy element box is a kind of "container" used to wrap the fuel rods. Zirconium alloy component box, referred to as "zirconium box" or "component box", is the main component of low-temperature nuclear heating reactor (NHR) and boiling water reactor (BWR), which is made of Zr-4 alloy plate. Inside the zirconium box is the rod bundle fuel assembly, and four zirconium boxes are arranged in the stack to form a wide water gap for the passage of the cross-wing control rods. In order to ensure that the rod bundl...

Claims

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Application Information

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IPC IPC(8): B23K37/053B23P15/00B23K31/02
Inventor 袁改焕蒋跃元王德华徐勇张亚军刘敏李恒羽
Owner 国核宝钛锆业股份公司
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