CN108735377A - A kind of preparation method of the U-shaped copper line of rabbet joint of NbTi/Cu superconducting wires - Google Patents
A kind of preparation method of the U-shaped copper line of rabbet joint of NbTi/Cu superconducting wires Download PDFInfo
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- CN108735377A CN108735377A CN201810547105.7A CN201810547105A CN108735377A CN 108735377 A CN108735377 A CN 108735377A CN 201810547105 A CN201810547105 A CN 201810547105A CN 108735377 A CN108735377 A CN 108735377A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
- H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
- H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
- H01B12/04—Single wire
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- H—ELECTRICITY
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/008—Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing extensible conductors or cables
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
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Abstract
The invention discloses a kind of NbTi/Cu superconducting wires preparation methods of the U-shaped copper line of rabbet joint, specifically include：Φ 8mm copper rods are chosen, its multi pass drawing to Φ 2mm- Φ 3mm is placed in by progress atmosphere protection annealing in atmosphere protection annealing furnace using wire drawing machine again；3 passes moldings are carried out after annealing；By the semi-finished product of roll forming using die drawn to design size to obtain the final product.One aspect of the present invention is beneficial to improve the residual resistance ratio of NbTi superconducting wires, on the one hand reduces follow-up rolling process resistance of deformation；It finally uses three passage continuous rolling methods and the method for final mold drawing to obtain the U-shaped copper line of rabbet joint of high-precision, process drawing and operation of rolling speed, is suitble to the large-scale batch production of the U-shaped copper line of rabbet joint of NbTi/Cu superconducting wires.
Description
Technical field
The invention belongs to superconductor processing technique fields, and in particular to a kind of U-shaped copper line of rabbet joint of NbTi/Cu superconducting wires
Preparation method.
Background technology
NbTi superconductors are mainly used in magnetic resonance imaging (MRI), nuclear magnetic resonance (NMR), Laboratory Instruments, particle at present
The fields such as accelerator, electric power, clearance, ore Magneto separate, magnetic suspension train, superconducting energy storage (SMES)；Traditional NbTi/Cu multicores are super
The preparation of conducting wire generally comprises alloy preparation, alloy bar processing, the combination of multicore complex and processing, the heat treatment of multiple core superconductive wire
Etc. technical process；Due to the influence for the factors such as process is complicated and of high cost, prepared NbTi/Cu multiple core superconductive wires
Copper than generally all controls below 4；But for some fields such as 3T or less magnetic resonance imagings (MRI) system, used in NbTi
Superconducting magnet needs very high stability, and copper is than being then one of the principal element for influencing its stability；Copper ratio is higher, stablizes
Property is better.Therefore, it prepares copper ratio and is higher than 7:1 NbTi/Cu multiple core superconductive wires are for obtaining the NbTi superconducting magnets of high stable extremely
It closes important.The whole world need to use about 3600 tons of NbTi superconducting lines at present, and wherein high-copper is about than superconducting wire proportion
80%, therefore preparation and batch production of the high-copper than superconducting wire become the most important thing.
When generally preparing high-copper than superconducting wire using mosaic mode at present, i.e., the superconduction round wires prepared are placed in U-shaped
In the copper line of rabbet joint, and the two is welded together using tin.The process and final precision of the U-shaped copper line of rabbet joint can influence U-shaped copper slot
The precision of line, and then influence the final performance of superconducting wire.At present since the U-shaped copper line of rabbet joint precision prepared is limited, lead to it
The residual resistance ratio (RRR values) of the superconducting wire processed is also restricted by it, it is therefore desirable to develop one kind can improve it is U-shaped
The preparation method of copper line of rabbet joint precision, to obtain the NbTi superconducting magnets of high stable.
Invention content
The object of the present invention is to provide a kind of NbTi/Cu superconducting wires preparation methods of the U-shaped copper line of rabbet joint, are high-copper ratio
The preparation of NbTi/Cu superconducting wires provides material foundation.
The technical solution adopted in the present invention is：A kind of preparation method of the U-shaped copper line of rabbet joint of NbTi/Cu superconducting wires, tool
Body includes the following steps：
Step 1, commercially available Φ 8mm copper rods are chosen, using wire drawing machine by its multi pass drawing to Φ 2mm- Φ 3mm；
Step 2, Φ 2mm- Φ 3mm copper wire in step 2 is placed in progress atmosphere protection annealing in atmosphere protection annealing furnace；
Step 3, annealed state Φ 2mm- Φ 3mm copper wire in step 2 is subjected to 3 passes moldings；
Step 4, by the semi-finished product of roll forming in step 3 using die drawn to design size.
The features of the present invention also characterized in that
In step 1, the material of commercially available Φ 8mm copper rods is C10100 high-purity oxygen-free coppers, every time working modulus is 20%, is drawn
It is 100~200m/min to stretch speed.
In step 2, in annealing process, annealing temperature is 250-270 DEG C, according to anneal gauge difference, annealing time 2-
4h, atmosphere 1%H2And 99%N2Mixed atmosphere is protected.
In step 3, the first passage operation of rolling is：Copper wire is rectangular by circle rolling, and the ratio of width to height of rectangle is 1.5, is added
Work rate is 7-10%.
In step 3, the second passage operation of rolling is：Copper wire is rolled into the square that upper surface carries semi-circular recesses by rectangle
Shape, width remain unchanged, working modulus 4-6%.
In step 3, third passes process is：Copper wire is rolled into upper table by rectangle of the upper surface with semi-circular recesses
Face carries the rectangle of U-shaped groove, and width and thickness has working modulus, working modulus 7-10% simultaneously.
Three passes are deformed into disposable continuous rolling in step 3, mill speed according to the different size copper line of rabbet joint without
Together, the copper line of rabbet joint is smaller, and speed is faster, conversely, slower, velocity interval is 100~150m/min.
For the mold used in step 4 for the mold of final design size, die angle is 6 degree, and mold material is that size is steady
Fixed preferable, wear-resisting Diamond dies, working modulus are 2~3%, it is therefore an objective to which the copper line of rabbet joint after rolling is carried out micro-shaping from reaching tool
There is the U-shaped copper line of rabbet joint of high dimensional accuracy.
The advantageous effect of the U-shaped copper line of rabbet joint preparation method of the present invention is to be added commercially available C10100 copper bar by hubbing
Work is to specific dimensions, then copper wire will make annealing treatment by the gross, is on the one hand beneficial to improve the residual resistance of NbTi superconducting wires
Than on the one hand reducing follow-up rolling process resistance of deformation；Finally use three passage continuous rolling methods and final mold drawing
Method obtain the U-shaped copper line of rabbet joint of high-precision, process drawing and operation of rolling speed, be suitble to NbTi/Cu superconducting wires U
The large-scale batch production of the type copper line of rabbet joint.
Description of the drawings
Fig. 1 is the design drawing of the special-shaped copper line of rabbet joint in the present invention；
Fig. 2 is different phase rolling deformation figure in the present invention.
Specific implementation mode
The present invention is described in detail with reference to the accompanying drawings and examples.
The NbTi/Cu superconducting wires of the present invention preparation method of the U-shaped copper line of rabbet joint, specifically includes following steps：
Step 1, commercially available Φ 8mm copper rods are chosen, material is C10100 high-purity oxygen-free coppers, using wire drawing machine by its multi-pass
It is drawn to Φ 2mm- Φ 3mm；Every time working modulus is 20% or so, and tensile speed is 100~200m/min.
Step 2, Φ 2mm- Φ 3mm copper wire in step 2 is placed in progress atmosphere protection annealing in atmosphere protection annealing furnace, moved back
Fiery temperature is 250-270 DEG C, according to anneal gauge difference, annealing time 2-4h, atmosphere 1%H2And 99%N2Mixed atmosphere
Protection.Annealing temperature is higher, and annealing time is longer, and size is smaller to working modulus when final molding after annealing, and RRR values are higher.
Step 3, annealed state Φ 2mm- Φ 3mm copper wire in step 2 is subjected to 3-4 passes moldings, the first passes
Process is：Copper wire is rectangular by circle rolling, and the ratio of width to height of rectangle is 1.5, working modulus 7-10%.The second passage operation of rolling
For：Copper wire is rolled into the rectangle that upper surface carries semi-circular recesses by rectangle, and width remains unchanged, working modulus 4-6%.Third
Passes process is：Copper wire is rolled into the rectangle that upper surface carries U-shaped groove by rectangle of the upper surface with semi-circular recesses,
Width and thickness has working modulus, working modulus 7-10% simultaneously.Three passes are deformed into disposable continuous rolling, roll
Journey schematic diagram is as shown in Fig. 2, and mill speed is different according to the different size copper line of rabbet joint, and the copper line of rabbet joint is smaller, and speed is faster, instead
It, slower, velocity interval is 100~150m/min.
Step 4, by the semi-finished product of roll forming in step 3 using die drawn to design size, due to the copper line of rabbet joint at this time
Size from final size very close to, it is desirable to rolling equipment can be proposed very high requirement by continuing rolling, therefore use small working modulus
Mold molding easily reach higher precision.As shown in Figure 1.It is stretched using common superconducting wire drawing die,
Die angle is 6 degree, and mold material is preferable, the wear-resisting Diamond dies of dimensionally stable, and working modulus is 2~3%, it is therefore an objective to will
The copper line of rabbet joint carries out micro-shaping from reaching the U-shaped copper line of rabbet joint with high dimensional accuracy after rolling.
NbTi/Cu superconducting wires, obtained NbTi/ are prepared using the U-shaped copper line of rabbet joint of high dimensional accuracy produced by the present invention
The residual resistance ratio (RRR values) of Cu superconducting wires is not less than 250, reaches as high as 400 or more, RRR values and passes through working modulus and annealing
Technology controlling and process.RRR values represent the stability that superconducting wire is prepared into superconducting magnet, it is seen that the method for the present invention is that follow-up preparation is high
The superconducting wire of stability provides good basis, and the NbTi/Cu that same performance can not be prepared using the prior art is super
Conductor.
The U-shaped copper line of rabbet joint performance prepared to the method for the present invention is detected, and the results are shown in Table 1.Utilize copper line of rabbet joint processing
Superconducting wire performance is shown in Table 2.
The 1 U-shaped copper line of rabbet joint performance of the present invention of table
As shown in Table 1, for the U-shaped copper line of rabbet joint length prepared using the method for the present invention up to 10000m or more, dimensional accuracy is equal
+/- 0.02mm is can reach, the RRR (300K/10K) >=400 of the U-shaped copper line of rabbet joint sample, tensile strength Rm>280Mpa.
Superconductor performance prepared by the 2 U-shaped copper line of rabbet joint of the present invention of table
| RRR(300K/10K) | Rp0.2/MPa | A50mm/% |
| 212 | 185 | 29.5 |
It is the specific preparating example of the U-shaped copper line of rabbet joint of the present invention below.
Embodiment 1
Commercially available Φ 8mm copper rods are chosen, and material is C10100 high-purity oxygen-free coppers, its 9 passage is drawn using multidie machine
It pulls out to Φ 2.86mm；Every time working modulus is 20% or so, tensile speed 120m/min.Φ 2.86mm copper wire is placed in atmosphere guarantor
It protects and carries out atmosphere protection annealing in annealing furnace, annealing temperature is 270 DEG C, according to anneal gauge difference, annealing time 2h, atmosphere
For 1%H2And 99%N2Mixed atmosphere is protected.The first passage operation of rolling is：Copper wire is rolled into 2.95*1.97mm by Φ 2.86mm
Rectangle, the ratio of width to height of rectangle is 1.5, working modulus 9.5%.The second passage operation of rolling is：Copper wire is rolled by rectangle
Surface carries the rectangle of semi-circular recesses, and line of rabbet joint width is 2.95mm, is highly 1.94mm, semi-circular recesses are a diameter of
0.70mm, working modulus 4.8%.Third passes process is：Copper wire is rolled by rectangle of the upper surface with semi-circular recesses
The rectangle of U-shaped groove is carried at upper surface, width 2.9mm is highly 1.9mm, and U-type groove width is 0.70, and U-type groove depth is
0.72mm, working modulus 10%.Three passes are deformed into disposable continuous rolling, mill speed 120m/min.It will rolling
Using die drawn to design size, the copper line of rabbet joint specification of final molding is molding semi-finished product：Width is 2.88mm, is highly
1.88mm, U-type groove width are 0.74, and U-type groove depth is 0.76mm, working modulus 3%.Die angle is 6 degree, and mold material is
Preferable, the wear-resisting Diamond dies of dimensionally stable.
Embodiment 2
Commercially available Φ 8mm copper rods are chosen, and material is C10100 high-purity oxygen-free coppers, its 10 passage is drawn using multidie machine
It pulls out to Φ 2.56mm；Every time working modulus is 20% or so, tensile speed 140m/min.Φ 2.56mm copper wire is placed in atmosphere guarantor
It protects and carries out atmosphere protection annealing in annealing furnace, annealing temperature is 260 DEG C, according to anneal gauge difference, annealing time 3h, atmosphere
For 1%H2And 99%N2Mixed atmosphere is protected.The first passage operation of rolling is：Copper wire is rolled into 2.65*1.75mm by Φ 2.56mm
Rectangle, the ratio of width to height of rectangle is 1.5, working modulus 9.9%.The second passage operation of rolling is：Copper wire is rolled by rectangle
Surface carries the rectangle of semi-circular recesses, and line of rabbet joint width is 2.65mm, is highly 1.7mm, a diameter of 0.60mm of semi-circular recesses,
Working modulus is 5.9%.Third passes process is：Copper wire is rolled into upper surface by rectangle of the upper surface with semi-circular recesses
Rectangle with U-shaped groove, width 2.64mm are highly 1.65mm, and U-type groove width is 0.60, and U-type groove depth is
0.62mm, working modulus 9.5%.Three passes are deformed into disposable continuous rolling, mill speed 140m/min.It will rolling
Using die drawn to design size, the copper line of rabbet joint specification of final molding is molding semi-finished product：Width is 2.62mm, is highly
1.63mm, U-type groove width are 0.66, and U-type groove depth is 0.64mm, working modulus 3%.Die angle is 6 degree, and mold material is
Preferable, the wear-resisting Diamond dies of dimensionally stable.
Embodiment 3
Commercially available Φ 8mm copper rods are chosen, and material is C10100 high-purity oxygen-free coppers, its 11 passage is drawn using multidie machine
It pulls out to Φ 2.28mm；Every time working modulus is 20% or so, tensile speed 160m/min.Φ 2.86mm copper wire is placed in atmosphere guarantor
It protects and carries out atmosphere protection annealing in annealing furnace, annealing temperature is 250 DEG C, according to anneal gauge difference, annealing time 4h, atmosphere
For 1%H2And 99%N2Mixed atmosphere is protected.The first passage operation of rolling is：Copper wire is rolled into 2.35*1.57mm by Φ 2.28mm
Rectangle, the ratio of width to height of rectangle is 1.5, working modulus 9.6%.The second passage operation of rolling is：Copper wire is rolled by rectangle
Surface carries the rectangle of semi-circular recesses, and line of rabbet joint width is 2.35mm, is highly 1.52mm, semi-circular recesses are a diameter of
0.50mm, working modulus 5.8%.Third passes process is：Copper wire is rolled by rectangle of the upper surface with semi-circular recesses
The rectangle of U-shaped groove is carried at upper surface, width 2.30mm is highly 1.48mm, and U-type groove width is 0.50, U-type groove depth
For 0.52mm, working modulus 10%.Three passes are deformed into disposable continuous rolling, mill speed 160m/min.It will roll
Molding semi-finished product are made using die drawn to design size, the copper line of rabbet joint specification of final molding is：Width is 2.28mm, height
For 1.46mm, U-type groove width is 0.53, and U-type groove depth is 0.55mm, working modulus 3%.Die angle is 6 degree, mold material
For preferable, the wear-resisting Diamond dies of dimensionally stable.
Embodiment 4
Commercially available Φ 8mm copper rods are chosen, and material is C10100 high-purity oxygen-free coppers, its 12 passage is drawn using multidie machine
It pulls out to Φ 2.04mm；Every time working modulus is 20% or so, tensile speed 180m/min.Φ 2.04mm copper wire is placed in atmosphere guarantor
It protects and carries out atmosphere protection annealing in annealing furnace, annealing temperature is 250 DEG C, according to anneal gauge difference, annealing time 2h, atmosphere
For 1%H2And 99%N2Mixed atmosphere is protected.The first passage operation of rolling is：Copper wire is rolled into 2.20*1.47mm by Φ 2.04mm
Rectangle, the ratio of width to height of rectangle is 1.5, working modulus 10%.The second passage operation of rolling is：Copper wire is rolled into upper table by rectangle
Face carries the rectangle of semi-circular recesses, and line of rabbet joint width is 2.20mm, is highly 1.42mm, a diameter of 0.40mm of semi-circular recesses,
Working modulus is 5.3%.Third passes process is：Copper wire is rolled into upper surface by rectangle of the upper surface with semi-circular recesses
Rectangle with U-shaped groove, width 2.15mm are highly 1.38mm, and U-type groove width is 0.40, and U-type groove depth is
0.42mm, working modulus 10%.Three passes are deformed into disposable continuous rolling, mill speed 180m/min.It will rolling
Using die drawn to design size, the copper line of rabbet joint specification of final molding is molding semi-finished product：Width is 2.13mm, is highly
1.36mm, U-type groove width are 0.46, and U-type groove depth is 0.44mm, working modulus 3%.Die angle is 6 degree, and mold material is
Preferable, the wear-resisting Diamond dies of dimensionally stable.
Claims (5)
1. a kind of NbTi/Cu superconducting wires preparation method of the U-shaped copper line of rabbet joint, which is characterized in that include the following steps：
Step 1, Φ 8mm copper rods are chosen, using wire drawing machine by its multi pass drawing to Φ 2mm- Φ 3mm；
Step 2, the copper wire after drawing is placed in progress atmosphere protection annealing in atmosphere protection annealing furnace；
Step 3, annealed state copper wire is subjected to 3 passes moldings；
Step 4, by the semi-finished product of roll forming using die drawn to design size.
2. the NbTi/Cu superconducting wires according to claim 1 preparation method of the U-shaped copper line of rabbet joint, which is characterized in that described
In step 1, the materials of Φ 8mm copper rods is C10100 high-purity oxygen-free coppers, every time working modulus is 20%, tensile speed is 100~
200m/min。
3. the NbTi/Cu superconducting wires according to claim 1 preparation method of the U-shaped copper line of rabbet joint, which is characterized in that step
In 2 annealing processes, annealing temperature is 250-270 DEG C, annealing time 2-4h, atmosphere 1%H2And 99%N2Mixed atmosphere
Protection.
4. the NbTi/Cu superconducting wires according to claim 1 preparation method of the U-shaped copper line of rabbet joint, which is characterized in that described
In step 3,3 passes moldings are carried out to annealed state copper wire, the first passage operation of rolling is：Copper wire is rolled into square by circle
The ratio of width to height of shape, rectangle is 1.5, working modulus 7-10%；The second passage operation of rolling is：Copper wire is rolled into upper surface by rectangle
Rectangle with semi-circular recesses, width remain unchanged, working modulus 4-6%；Third passes process is：Copper wire is by upper table
Rectangle of the face with semi-circular recesses is rolled into the rectangle that upper surface carries U-shaped groove, and width and thickness has working modulus simultaneously,
Working modulus is 7-10%；Three passes are deformed into disposable continuous rolling, mill speed ranging from 100~150m/min.
5. the NbTi/Cu superconducting wires according to claim 1 preparation method of the U-shaped copper line of rabbet joint, which is characterized in that described
It is 6 degree that Diamond dies, die angle are used in step 4, and working modulus is 2~3%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114898941A (en) * | 2022-05-30 | 2022-08-12 | 江苏优轧机械有限公司 | Preparation method of U-shaped copper groove wire for superconducting wire |
| CN116741459A (en) * | 2023-07-05 | 2023-09-12 | 广东中实金属有限公司 | Preparation method of ultra-large copper grooved wire for superconducting cable |
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| CN1948531A (en) * | 2006-11-03 | 2007-04-18 | 宁波博威集团有限公司 | High manganese copper nickel zinc alloy and preparation method of its wire, rod and plate belt material |
| CN102218464A (en) * | 2011-01-28 | 2011-10-19 | 杭州银都餐饮设备有限公司 | Plate U-shaped processing method used on automatic production line |
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| CN114898941A (en) * | 2022-05-30 | 2022-08-12 | 江苏优轧机械有限公司 | Preparation method of U-shaped copper groove wire for superconducting wire |
| CN116741459A (en) * | 2023-07-05 | 2023-09-12 | 广东中实金属有限公司 | Preparation method of ultra-large copper grooved wire for superconducting cable |
| CN116741459B (en) * | 2023-07-05 | 2024-01-02 | 广东中实金属有限公司 | Preparation method of copper grooved wire for superconducting cable |
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| CN108735377B (en) | 2020-08-25 |
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