CN101797684B - Method for drilling deep hole on CuNb composite tube in internal-tin method Nb3Sn wire preparation process - Google Patents
Method for drilling deep hole on CuNb composite tube in internal-tin method Nb3Sn wire preparation process Download PDFInfo
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- CN101797684B CN101797684B CN2010101385925A CN201010138592A CN101797684B CN 101797684 B CN101797684 B CN 101797684B CN 2010101385925 A CN2010101385925 A CN 2010101385925A CN 201010138592 A CN201010138592 A CN 201010138592A CN 101797684 B CN101797684 B CN 101797684B
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Abstract
The invention discloses a method for drilling a deep hole on a CuNb composite tube in an internal-tin method Nb3Sn wire preparation process, which comprises the following steps: straightening a multi-core CuNb composite rod; clamping the rod on a lathe and drilling a lead hole in an area in which Cu is to be removed, wherein the aperture of the lead hole is phi 22.0mm and the depth of the lead hole is 5 to 10cm; clamping the CuNb composite rod on a deep hole drilling machine with inside chip removal; supporting the clamped CuNb composite rod with a centre frame; mounting a cutter on a hollow cutter rod; manually feeding, adjusting the rotation speed of a main shaft to between 800 and 1,100r/min, adjusting the cutter cutting feed amount to between 10 and 15mm/min, and adjusting the oil pressure of a chip removal system to between 20 and 40MPa; and after the drilling is completed, slowly retracting the cutter. The method of the invention can control the eccentricity of the circle centre of the outlet of the deep hole to within 0.3/1,000 and the yield of the finished deep hole can reach over 95 percent.
Description
Technical field
The invention belongs to the superconductor processing technique field, relate to a kind of interior tin method Nb
3The deep hole processing method of CuNb multiple tube in the preparation of Sn wire rod.
Background technology
In recent years, since the high speed development of superconducting magnet technology with and the continuous expansion of application, the demand of the above superconducting magnet of 10T presents the trend that increases rapidly, it can be applicable to solving the international thermonuclear fusion reaction experimental reactor of ITER(that energy problem builds), for the magnetic resonance spectrometer (NMR) that satisfies fine chemistry industry and macromolecular material research and development preparation demand, for satisfying particle accelerator magnet of scientific experiment requirement or the like, and the superconductor that this magnet of coiling is used requires still have excellent superconductivity under High-Field, Nb
3The Sn superconductor is one of optimal low temperature superconducting material of this magnet of coiling just.
Nb
3Sn has compound between the brittle metal of A15 structure, and the practical Nb of instructions for use is satisfied in preparation
3The technology of Sn material is very complicated.The method that generally adopts has bronze method (Bronze Route), powder-in-tube technique (Power In Tube) and Nei Xifa (Internal Tin) both at home and abroad.For bronze method, be subjected to the restriction of Sn content in the Cu matrix, the raising of the superconductivity Ic of strand is very difficult, the increase that the repeatedly annealing in process in the while process has also been brought cost; Owing to used the powder of Nb pipe and rich Sn, its cost of material is high in powder-in-tube technique; Nei Xifa technology has then overcome the shortcoming of above-mentioned two kinds of methods, but owing to used low-melting Sn as the Sn source, the processing characteristics of Sn and other metals exists the introducing of big-difference very and low melting point Sn to get rid of the advantage of utilizing hot extrusion processing may and to cause processing to be broken.So the high-quality CuNb multiple tube of preparation is not only favourable but also help the processing of strand for the performance optimization of strand in whole processing technology.
Usually in Nei Xifa preparation technology in the preparation of CuNb multiple tube, the center of being crushed to has the CuNb compound bar in the pure Cu of certain area ratio district earlier, the Cu deep hole machining of centre is removed obtained the CuNb multiple tube then, when pushing like this distortion even, help Nb
3The following process of Sn strand and optimization in Properties are stable, and this hot extrusion simultaneously also can make and reach the excellent metallurgical combination between the CuNb interface, is beneficial to Nb
3The processing of Sn strand.Quality for the deep hole machining quality of the middle Cu of CuNb compound bar directly affects Nb
3The processing of Sn strand is because leave the uniform Cu of a circle, at Nb between the inner ring Nb core of CuNb compound bar and endoporus
3Thereby the effect that can play cushion in the processing of Sn strand reduces broken string, and the outlet center of circle eccentricity that generally requires deep hole machining is in 0.3/1000.Be yield rate that guarantees processing and the feasibility of considering processing, the general length of extruding back bar is blocked and is 1.5m-2.0m.Add man-hour in that 1.5m-2.0m bar center C u is removed, the difficulty of processing height of deep hole, be easy to cause serious eccentric in addition can injure around the Nb core, cause CuNb complex calcellation rate height, increase production cost.
Summary of the invention
The purpose of this invention is to provide a kind of interior tin method Nb
3The deep hole processing method of CuNb multiple tube in the Sn wire rod preparation, the deep hole machining that has solved CuNb multiple tube center C u are removed difficulty, export center deviation and are difficult to the problem of controlling, cause yield rate low, are fit to the industrialization volume production.
The technical solution adopted in the present invention is interior tin method Nb
3The deep hole processing method of CuNb multiple tube in the preparation of Sn wire rod, carry out according to the following steps:
Step 1,
Extruding is blocked and is made the long 1.5m-2.0m of being, diameter is the multicore CuNb compound bar of Φ 49mm-Φ 51mm;
Step 2,
The multicore CuNb compound bar that step 1 obtains is aligned, nonstraightness is less than 0.1/1000, multicore CuNb compound bar after will aligning then is installed in lathe, one end processing is smooth, the hole as waiting to remove the Cu district, is drawn waiting to remove to process in the Cu district by the pure Cu district at center, drawing the aperture, hole is Φ 22.0mm, draw the hole hole tolerance and remain in the 0-0.05mm, drawing hole depth is 5 cm-10cm, obtains carrying out the CuNb compound bar of drawing the hole;
Step 3
Step 2 is carried out the CuNb compound bar of drawing the hole to be installed on the bta deep hole drilling bed, and support the CuNb compound bar that is installed with centre frame, deviation when making whole CuNb compound bar rotation is identical with the linearity of aligning, cutter is loaded on the hollow knife bar, and manually feed, cutter is entered draw in the hole, starting device then, adjust the speed of mainshaft to 800 r/min-1100r/min, the Tool in Cutting amount of feeding is adjusted into 10 mm/min-15mm/min, and the chip removal system oil pressure is to 20MPa-40MPa, arrestment after the process finishing, manually withdrawing is at a slow speed promptly finished.
Feature of the present invention also is,
Multicore CuNb compound bar is to be matrix with the Cu layer, and Nb or Nb alloy bar are distributed in the zone of cross section for annular of Cu matrix symmetrically, and the center has the CuNb compound bar in pure Cu district, and the diameter in pure Cu district is Φ 26 mm-Φ 27mm.
Tin method Nb in of the present invention
3The deep hole processing method of CuNb multiple tube in the preparation of Sn wire rod, the deep hole machining of CuNb multiple tube center C u is easy, deep hole can be exported center of circle eccentricity and be controlled in 0.3/1000, and the yield rate of boring can reach more than 95% suitable industrialization volume production.
Description of drawings
Fig. 1 is a multicore CuNb compound bar cross-sectional structure schematic diagram in the inventive method;
Fig. 2 carries out the CuNb compound bar vertical section structure schematic diagram that draws the hole in the inventive method;
Fig. 3 is the statistical chart that adopts the inventive method processing back gun drilling outlet eccentricity.
Wherein, 1. Nb or Nb alloy bar, 2. the Cu layer 3. waits to remove the Cu district, 4. draws the hole, and wherein, d is for drawing the aperture, hole, and h is for drawing hole depth.
The specific embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Tin method Nb in of the present invention
3The deep hole processing method of CuNb multiple tube in the preparation of Sn wire rod, specifically carry out according to the following steps:
Step 1,
Extruding is blocked and is obtained the long 1.5m-2.0m of being, diameter is a Φ 49mm-Φ 51mm multicore CuNb compound bar; Multicore CuNb compound bar cross-sectional structure as shown in Figure 1, wherein multicore CuNb compound bar be a kind of be matrix with Cu layer 2, Nb or Nb alloy bar 1 are distributed in the zone of cross section for annular of Cu matrix 2 symmetrically, the center has the CuNb compound bar in certain pure Cu district, and the diameter in pure Cu district is generally between Φ 26 mm-Φ 27mm;
Step 2,
The multicore CuNb compound bar that step 1 makes is aligned, the nonstraightness of aligning back bar is less than 0.1/1000, multicore CuNb compound bar after will aligning then is installed in lathe, the processing of one end is smooth, with the pure Cu district at center as waiting to remove Cu district 3, draw hole 4 waiting to remove in the Cu district 3 processing, it is identical with aperture radix that will follow-up deep hole machining to draw aperture, hole d, for the present invention, drawing aperture, hole d is Φ 22.0mm, draw aperture, hole d tolerance remain on+0.00/-0.05mm in, degree of depth h is 5-10cm, carry out draw the hole CuNb compound bar vertical section structure schematic diagram as shown in Figure 2;
Step 3
Step 2 is carried out the CuNb compound bar of drawing the hole be installed on the bta deep hole drilling bed, and support the CuNb compound bar that is installed with centre frame, the deviation when making whole CuNb compound bar rotation is identical with the linearity of aligning.Cutter is loaded on the hollow knife bar, and manually feed, make cutter enter that step 2 is ready-made draws in the hole, starting device then, adjust the speed of mainshaft to 800 r/min-1100r/min, the Tool in Cutting amount of feeding is adjusted into 10 mm/min-15mm/min, and the chip removal system oil pressure is considered to be worth doing in time with Cu in the assurance process to 20MPa-40MPa and discharged.At any time pay close attention to the chip removal situation in process, normal Cu processing bits should be than 50mm is long with interior strip uniformly, if occur should in time adjusting the feed speed of cutter unusually, guarantee the uniformity of the unimpeded and Cu bits shape of chip removal.Process finishing, arrestment, manually withdrawing at a slow speed avoids injuring endoporus, promptly obtains tin method Nb in the present invention
3CuNb multiple tube in the preparation of Sn wire rod.
Embodiment 1
The long 1.5m that is is blocked in extruding, diameter is the multicore CuNb compound bar of Φ 49mm, pure Cu district, multicore CuNb compound bar center diameter is Φ 26 mm, the nonstraightness of aligning back bar is 0.04/1000, the hole is drawn in processing, drawing the aperture, hole is 21.98mm, degree of depth 8.0mm, rotate after being stuck in deep hole drilling machine and fixing the CuNb compound bar with centre frame, the deviation of beating that records the CuNb rod is 0.04/1000, the speed of mainshaft is 950r/min, and the Tool in Cutting amount of feeding is 10mm/min, and it is 38Mpa that row cuts system oil pressure, finishing process time is 3.9h, and recording outlet center of circle eccentricity is 0.02/1000.
Embodiment 2
The long 1.67m of being is blocked in extruding, diameter is the multicore CuNb compound bar of Φ 50mm, pure Cu district, multicore CuNb compound bar center diameter is Φ 27mm, the nonstraightness of aligning back bar is 0.1/1000, the hole is drawn in processing, drawing hole dimension is 21.96mm, degree of depth 5.0mm, being stuck in deep hole drilling machine and rotating the deviation of beating with the fixing back of centre frame is 0.12/1000, the speed of mainshaft is 800r/min, the Tool in Cutting amount of feeding is 14mm/min, it is 20Mpa that row cuts system oil pressure, and finishing process time is 2h, and recording outlet center of circle eccentricity is 0.05/1000.
Embodiment 3
The long 2.0m of being is blocked in extruding, diameter is the CuNb compound bar of Φ 51mm, pure Cu district, multicore CuNb compound bar center diameter is Φ 26.5 mm, the nonstraightness of aligning back bar is 0.06/1000, the hole is drawn in processing, drawing hole dimension is 21.98mm, degree of depth 10mm, being stuck in deep hole drilling machine and rotating the deviation of beating with the fixing back of centre frame is 0.06/1000, the speed of mainshaft is 1100r/min, the Tool in Cutting amount of feeding is 15mm/min, it is 40Mpa that row cuts system oil pressure, and finishing process time is 2.4h, and recording outlet center of circle eccentricity is 0.10/1000.
From embodiment 1-embodiment 3 as can be seen, the CuNb multiple tube outlet center of circle eccentricity that adopts deep hole machining of the present invention satisfies interior tin method Nb fully less than 0.3/1000
3The instructions for use of Sn is beneficial to the stable of the processing of strand and performance, and the yield rate of gun drilling processing can reach more than 95%, has effectively controlled product cost.Fig. 3 is for adopting the statistical chart of the gun drilling outlet center of circle, the inventive method processing back eccentricity, and the outlet eccentricity and the yield rate of visible deep hole machining have obtained better controlled, have stablized product quality and have controlled cost.
Claims (2)
1. tin method Nb in a kind
3The deep hole processing method of CuNb multiple tube is characterized in that in the preparation of Sn wire rod, carries out according to the following steps:
Step 1,
Extruding is blocked and is made the long 1.5m-2.0m of being, diameter is a Φ 49mm-Φ 51mm multicore CuNb compound bar;
Step 2,
The multicore CuNb compound bar that step 1 obtains is aligned, linearity is less than 0.1/1000, multicore CuNb compound bar after will aligning then is installed in lathe, one end processing is smooth, the hole as waiting to remove the Cu district, is drawn waiting to remove to process in the Cu district by the pure Cu district at center, drawing the aperture, hole is Φ 22.0mm, draw the hole hole tolerance and remain in the 0-0.05mm, drawing hole depth is 5 cm-10cm, obtains carrying out the CuNb compound bar of drawing the hole;
Step 3
Step 2 is carried out the CuNb compound bar of drawing the hole to be installed on the bta deep hole drilling bed, and support the CuNb compound bar that is installed with centre frame, deviation when making whole CuNb compound bar rotation is identical with the linearity of aligning, cutter is loaded on the hollow knife bar, and manually feed, cutter is entered draw in the hole, starting device then, adjust the speed of mainshaft to 800 r/min-1100r/min, the Tool in Cutting amount of feeding is adjusted into 10 mm/min-15mm/min, and the chip removal system oil pressure is to 20MPa-40MPa, arrestment after the process finishing, manually withdrawing is at a slow speed promptly finished.
2. tin method Nb in according to claim 1
3The deep hole processing method of CuNb multiple tube in the preparation of Sn wire rod, it is characterized in that, described multicore CuNb compound bar is to be matrix with the Cu layer, Nb or Nb alloy bar are distributed in the zone of cross section for annular of Cu matrix symmetrically, the center has the CuNb compound bar in pure Cu district, and the diameter in pure Cu district is Φ 26 mm-Φ 27mm.
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| CN110580985A (en) * | 2018-06-11 | 2019-12-17 | 西部超导材料科技股份有限公司 | Method for preparing high critical current niobium-tin superconducting strand in external blocking mode |
| CN111715918B (en) * | 2020-06-11 | 2021-11-09 | 江苏迈信林航空科技股份有限公司 | Machining method for small-diameter deep hole of aviation shell |
| CN115295243B (en) * | 2022-09-30 | 2022-12-30 | 西部超导材料科技股份有限公司 | Preparation method of element-doped high-critical-current-density niobium-tin superconducting strand |
| CN116598064A (en) * | 2023-07-14 | 2023-08-15 | 西安聚能超导线材科技有限公司 | Ta enhanced Sn source distributed Nb 3 Preparation method of Sn superconducting wire |
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Address after: 710018 Shaanxi Province Economic and Technological Development Zone Xi'an Mingguang Road No. 12 Patentee after: Western Superconducting Technologies Co., Ltd. Address before: 710018 Shaanxi Province Economic and Technological Development Zone Xi'an Mingguang Road No. 12 Patentee before: Western Superconducting Technologies Co., Ltd. |