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Method for manufacturing high-purity niobium pipe through repeated stretching forming for radio frequency superconductor cavity

A technology of multiple forming and multiple stretching, applied in electrical components, accelerators, etc., can solve the problems of waste of niobium material, high production cost, large tolerance of weld roundness, etc., and achieve the effect of ensuring the RRR value

Inactive Publication Date: 2020-11-20
INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, high-purity niobium tubes at home and abroad are realized by high-purity niobium rod machine processing and high-purity niobium plate rolling. The disadvantage of high-purity niobium plate rolling is the presence of welds and large roundness tolerances, resulting in low machining accuracy of the cavity

Method used

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  • Method for manufacturing high-purity niobium pipe through repeated stretching forming for radio frequency superconductor cavity
  • Method for manufacturing high-purity niobium pipe through repeated stretching forming for radio frequency superconductor cavity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, preparation high-purity RRR niobium tube

[0029] In this example, φ125×4.2mm high-purity niobium plate with RRR value of 340 is used as raw material, and a high-purity niobium tube with a specification of φ46×3×58mm is developed by the manufacturing method of multiple stretching.

[0030] Step 1, sanding and grinding the surface of the above-mentioned high-purity niobium plate to eliminate surface defects of the metal plate, and cleaning the surface of the plate to remove residual metal debris and processing oil on the surface;

[0031] Step 2, cut into circles according to the size of the high-purity niobium pipe material, and remove the burrs after cutting into circles;

[0032] Step 3, install the multi-forming mold developed by Northwest Nonferrous Metals Research Institute on the press, and this mold has the functions of forming and returning materials. Apply stretching oil to the working part of the mold, put the round cut high-purity niobium plate...

Embodiment 2

[0040] Embodiment 2, preparation high-purity RRR niobium tube

[0041] In this example, φ360×4.8mm high-purity niobium plate with RRR value of 342 is used as raw material, and a high-purity niobium tube with a specification of φ110×3×152.4mm is developed by the manufacturing method of multiple stretching.

[0042] Step 1, sanding and grinding the surface of the above-mentioned high-purity niobium plate to eliminate surface defects of the metal plate, and cleaning the surface of the plate to remove residual metal debris and processing oil on the surface;

[0043] Step 2, cut into circles according to the size of the high-purity niobium pipe material, and remove the burrs after cutting into circles;

[0044] Step 3, install the multi-forming mold developed by Northwest Nonferrous Metals Research Institute on the press, and this mold has the functions of forming and returning materials. Apply stretching oil to the working part of the mold, put the round cut high-purity niobium p...

Embodiment 3

[0051] Embodiment 3, preparation high-purity RRR niobium tube

[0052] In this example, a φ200×5.2mm high-purity niobium plate with an RRR value of 338 is used as a raw material, and a high-purity niobium tube with a specification of φ42×3×88mm is developed by a manufacturing method of multiple stretching.

[0053] Step 1, sanding and grinding the surface of the above-mentioned high-purity niobium plate to eliminate surface defects of the metal plate, and cleaning the surface of the plate to remove residual metal debris and processing oil on the surface;

[0054] Step 2, cut into circles according to the size of the high-purity niobium pipe material, and remove the burrs after cutting into circles;

[0055] Step 3, install the multi-forming mold developed by Northwest Nonferrous Metals Research Institute on the press, and this mold has the functions of forming and returning materials. Apply stretching oil to the working part of the mold, put the round cut high-purity niobium ...

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Abstract

The invention discloses a method for manufacturing a high-purity niobium pipe through repeated stretching forming. The method comprises the following steps of (1) selecting a high-purity niobium platewith a RRR value larger than 330, and carrying out sanding, polishing treatment and cleaning on the surface of the high-purity niobium plate; 2) removing burrs after circle cutting; 3) mounting a primary stretching and material returning mold on a press machine, loading a high-purity niobium circular plate subjected to circle cutting into the mold, and starting the press machine to work to complete primary stretching and demolding; 4) mounting a secondary stretching and material returning mold on the press machine, loading the high-purity niobium pipe into a stretching mold, and starting thepress machine to work to complete secondary stretching and demolding; and 5) turning and flattening the high-purity niobium pipe subjected to secondary stretching, pickling, and carrying out high-vacuum heat treatment on the pickled high-purity niobium pipe to obtain the high-purity niobium pipe. The high-purity niobium plate disclosed by the invention is manufactured into a seamless pipe with high RRR value and small roundness tolerance through a repeated stretching forming method, so that the production cost of the niobium pipe is reduced, and the machining precision of a cavity is improved.

Description

technical field [0001] The invention belongs to the field of particle accelerators, and in particular relates to a method for manufacturing high-purity niobium tubes with an RRR value greater than 300 for radio frequency superconducting cavities by multiple stretching. Background technique [0002] With the development of basic research and applied research in nuclear physics, the construction of high-energy, high-intensity accelerators has become a research hotspot in the field of particle accelerators. Due to the excessive resistance loss of oxygen-free copper, traditional copper RF cavities cannot operate at high gradients and high duty cycles, which limits the increase in accelerator energy. In a liquid helium environment (2K or 4K), metal niobium is in a superconducting state, and its surface resistance is 10 times that of oxygen-free copper. -5 times, therefore, the radio frequency cavity manufactured by metal niobium can operate stably under high acceleration gradien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06B21D22/28C23G1/08C23G1/10C22F1/18H05H7/00
CPCB21C37/065B21D22/28C22F1/18C23G1/086C23G1/106H05H7/00
Inventor 王志军宋健王若旭岳伟明舒滢何源郭学鹏任军帅
Owner INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
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