CN106694605B - A kind of radio-frequency cable inner screw thread copper pipe and its preparation process - Google Patents
A kind of radio-frequency cable inner screw thread copper pipe and its preparation process Download PDFInfo
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- CN106694605B CN106694605B CN201611182153.8A CN201611182153A CN106694605B CN 106694605 B CN106694605 B CN 106694605B CN 201611182153 A CN201611182153 A CN 201611182153A CN 106694605 B CN106694605 B CN 106694605B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
Abstract
A kind of disclosed radio-frequency cable inner screw thread copper pipe and its preparation process, belong to copper pipe processing field, include the following steps：Continuous up-casting skirt, billet production, disk drawing, inner wall washing, online induction annealing, forming internal threads, after-combustion, well furnace, disk, packaging and storage.The technique of the present invention prepares a kind of existing smooth copper of tapped copper pipe replacement, solve the problems, such as that former smooth copper flexibility is poor, more former smooth copper reduces 15% again per Mick simultaneously, mechanical performance improves 5%, electric property improves 3%, and production cost is reduced while improving properties of product stability.
Description
Technical field
The present invention relates to a kind of preparation method of copper pipe more particularly to a kind of radio-frequency cable inner screw thread copper pipe and its preparations
Technique.
Background technology
Radio-frequency cable is a kind of radio-frequency transmission line for transmitting radio frequency signals, radio communication and broadcast, TV,
Radar, navigation, computer, instrument etc. are widely applied.Tubular shape conductor is radio-frequency cable air and half air insulation
Low decaying high power cable inner wire used by primary structure form, in view of the effect of the Kelvin effect under high frequency, high frequency
Under electric current it is only logical in the very thin laminar flow of conductive surface, as long as therefore tubular shape conductor tube wall it is bigger 4-5 than the penetration depth of electric current
Times or more, it is internal conductor material that smooth copper is mostly used in former radio-frequency cable production technology, compared with solid core conductor, tubulose
Conductor has light-weight advantage, but tubular shape conductor flexibility is poor, can increase decaying and standing-wave ratio to a certain extent, to
Influence the stability of signal in the transmission.
Invention content
Increase helicitic texture the purpose of the present invention is to provide a kind of radio-frequency cable inner screw thread copper pipe, in internal to substitute now
Some smooth coppers can effectively solve the problems, such as that smooth copper flexibility is poor, so that copper pipe is every by the optimization of processing technology
Mick reduces 15% again, and mechanical performance improves 5%, and electric property improves 3%, is dropped while improving properties of product stability
Low production cost.
The technical scheme is that：A kind of radio-frequency cable inner screw thread copper pipe, the copper tube size are Φ 12.70*
0.30mm, it is internal that there is thread, and the number of teeth of thread is 30, transverse tooth thickness 0.20mm, space width 0.63mm, tooth top
Angle is 50 ° 24 ', and helical angle is 45 °.
A kind of preparation process of radio-frequency cable inner screw thread copper pipe, specifically comprises the following steps：
A, continuous up-casting skirt：Using Cu-CATH-1 as raw material, melting in melting furnace is added, smelting temperature is maintained at
1160-1180 DEG C, the graphite powdered carbon of 80-150mm thickness is added into melting furnace as coverture, copper liquid passes through side in melting furnace
Face bottom is flowed ditch and is flowed into holding furnace, and control heat preservation in-furnace temperature is maintained at 1155-1175 DEG C, and high purity graphite is used in holding furnace
Scale carries out pre- consolidated degassing process as coverture before skirt to copper liquid, by liquid level control is 40- when normal skirt
60mm is used in combination the graphite guide tube of a diameter of 30mm to be passed through high pure nitrogen, uninterrupted 1.0L/min, to remove stove into copper liquid
Interior gas, by the Control for Oxygen Content in copper liquid in 8ppm hereinafter, drawing the bright and clean flawless of pipe surface requirements；
B, billet production：The oxygen-free copper pipe cutting on line saw that the specification that above-mentioned steps a is produced is Φ 85*11mm cuts
The pipe of 10m long carries out straightening operation using straightener, and the copper tube billet after aligning, which is put into tube rolling slot, carries out rolling operation, rolls
Size is Φ 42.0*2.10mm after system, and controlled rolling speed is 0.5m/min, and the copper pipe after rolling is received with coiler to Φ 3.5m
Round charging basket in；
C, disk is drawn：Copper tube billet after rolling is drawn by 9, is processed into the semi-finished product of Φ 12.70*0.30mm, per pass
The main technologic parameters of drawing are：
First passage：Supplied materials size is Φ 42.0*2.10mm, and external mold size is Φ 36.0mm, and internal model size is Φ 32.6*
36.5mm, working modulus 1.47, drawing rate are 380m/min；
Second passage：Supplied materials size is Φ 36.0*1.70mm, and external mold size is Φ 31.0mm, and internal model size is Φ 28.2*
31.5mm, working modulus 1.41, drawing rate are 400m/min；
Third passage：Supplied materials size is Φ 31.0*1.40mm, and external mold size is Φ 27.0mm, and internal model size is Φ
24.74*27.50mm working modulus 1.42, drawing rate is 450m/min；
Four-pass：Supplied materials size is Φ 27.0*1.13mm, and external mold size is Φ 23.4mm, and internal model size is Φ
21.56*23.90mm working modulus 1.42, drawing rate is 450m/min；
5th passage：Supplied materials size is Φ 23.4*0.92mm, and external mold size is Φ 20.8mm, and internal model size is Φ
19.34*21.20mm working modulus 1.41, drawing rate is 500m/min；
6th passage：Supplied materials size is Φ 20.8*0.73mm, and external mold size is Φ 18.6mm, and internal model size is Φ
17.44*13.95mm working modulus 1.42, drawing rate is 550m/min；
7th passage：Supplied materials size is Φ 18.6*0.58mm, and external mold size is Φ 16.50mm, and internal model size is Φ
15.60*17.00mm working modulus 1.42, drawing rate is 600m/min；
8th passage：Supplied materials size is Φ 16.5*0.46mm, and external mold size is Φ 14.50mm, and internal model size is Φ
13.76*15.00mm working modulus 1.41, drawing rate is 650m/min；
9th passage：Supplied materials size is Φ 14.50*0.37mm, and external mold size is Φ 12.70mm, and internal model size is Φ
12.10*13.20mm working modulus 1.40, drawing rate is 700m/min；
D, inner wall washing：Copper pipe inner wall after disk is drawn has a large amount of lubricating oil, the copper after compressed air need to being utilized to draw disk
Inside pipe wall is cleaned, and the air pressure of compressed air is 8MPa, sponge fragment is filled in pipe, under the drive of compressed air
Play the role of cleaning；
E, online induction annealing：Copper pipe after cleaning is hoisted to progress online annealing, online annealing work(at online annealing
Rate is 100KW, annealing rate 40m/min, copper pipe elongation percentage >=45% after annealing；
F, forming internal threads：The smooth copper for having moved back fire is subjected to forming internal threads, internal thread tooth form is spiral shape, screw thread
The number of teeth of tooth is 30, transverse tooth thickness 0.20mm, space width 0.63mm, and addendum angle is 50 ° 24 ', and helical angle is 45 °, molding speed
Degree is 40-50m/min, tensile strength 300MPa, elongation percentage >=40%；
G, after-combustion：The inner screw thread copper pipe of Φ 3.5m material frame take-ups is subjected to after-combustion, in packing to Φ 1.2m material frames, after-combustion work
The rate of sequence is 200m/min, with strap be packaged after the completion of after-combustion and divides disk, send to annealed zone；
H, well furnace：Inner screw thread copper pipe in Φ 1.2m material frames is hung in shaft furnace, carries out annealing operation so that copper
Tensile strength >=240Mpa of pipe, elongation percentage >=35%, conductivity 100%IACS；
I, fall disk：For convenience of transporting and storing, copper pipe shallow bid copper pipe is hoisted on the pay off rack of falling disk, the work of falling disk is carried out
Industry, the speed control of falling disk are 120m/min, and when after-combustion should avoid drawing copper pipe flat；
J, packaging and storage：Physical and chemical inspection is carried out to the copper pipe fallen after the completion of disk, the oxygen content for testing oxygen-free copper pipe is less than
8ppm, tensile strength are more than 240MPa, and elongation percentage is more than 35%, and ovality is less than 3%, is carried out using pearl cotton and plastic film
Packaging, prevents copper pipe damaging in transportational process and aoxidizes.
The technological parameter of annealing operation in the step h is：Annealing temperature：390-410℃；Heating-up time：240min；
Soaking time：120min；Evacuated pressure：-0.1MPa；Nitrogen pressure：0.05-0.1MPa；The inflated with nitrogen time：15min；It comes out of the stove
Temperature：36-40℃.
Upward-casting process, compared with horizontal casting method, upward-casting process are used for the production of copper pipe pipe in the present invention
The pipe oxygen content of the pipe of production advantages such as low, at low cost with oxygen content, upward-casting process production is less than 8ppm, effectively solves
There is the problems such as pipe cracking, oxidation during the rolling process in pipe of having determined；It is processed using nine procedures in disk draws process,
Processing is drawn to reduce a time under the premise of ensuring processing request compared to existing disk, when reducing processing cost and processing
Between, improve processing efficiency；Annealing operation before forming internal threads uses online induction annealing process, compared with well formula is annealed,
Online annealing can keep the continuity of production, effectively raise production efficiency.
Copper pipe in the present invention, interior wall construction uses spiral shape, and the number of teeth of thread is 30, and transverse tooth thickness is
0.20mm, space width 0.63mm, addendum angle are 50 ° 24 ', and helical angle is 45 ° so that copper pipe is reduced compared to smooth copper grammes per square metre
15%, mechanical performance improves 5%, and electric property improves 3%.
Advantageous effect：A kind of disclosed radio-frequency cable inner screw thread copper pipe increases helicitic texture in internal and replaces
For existing smooth copper, it can effectively solve the problems, such as that smooth copper flexibility is poor, copper is made by the optimization of processing technology
Pipe reduces 15% per Mick again, and mechanical performance improves 5%, and electric property improves 3%, improves the same of properties of product stability
When reduce production cost.
Description of the drawings
Fig. 1 is the semi-cutaway of inner screw thread copper pipe of the present invention；
Fig. 2 is the cross-sectional view of the present invention.
Specific implementation mode
Below in conjunction with specific embodiment, clear, complete description is carried out to technical scheme of the present invention.
As shown in Figure 1 and 2, disclosed a kind of radio-frequency cable inner screw thread copper pipe, inner wall have thread,
Screwed pipe outer diameter D is 12.7mm, and bottom wall thickness Tw is 0.30mm, and the number of teeth of thread is 30, and transverse tooth thickness Ht is 0.20mm, space width
It it is 50 ° 24 ' for 0.63mm, addendum angle α, helixangleβ is 45 °.
A kind of preparation process of disclosed radio-frequency cable inner screw thread copper pipe, specifically comprises the following steps：
A, continuous up-casting skirt：Using Cu-CATH-1 as raw material, melting in melting furnace is added, smelting temperature is maintained at
1160-1180 DEG C, the graphite powdered carbon of 80-150mm thickness is added into melting furnace as coverture, copper liquid passes through side in melting furnace
Face bottom is flowed ditch and is flowed into holding furnace, and control heat preservation in-furnace temperature is maintained at 1155-1175 DEG C, and high purity graphite is used in holding furnace
Scale carries out pre- consolidated degassing process as coverture before skirt to copper liquid, by liquid level control is 40- when normal skirt
60mm is used in combination the graphite guide tube of a diameter of 30mm to be passed through high pure nitrogen, uninterrupted 1.0L/min, to remove stove into copper liquid
Interior gas, by the Control for Oxygen Content in copper liquid in 8ppm hereinafter, drawing the bright and clean flawless of pipe surface requirements；
B, billet production：The oxygen-free copper pipe cutting on line saw that the specification that above-mentioned steps a is produced is Φ 85*11mm cuts
The pipe of 10m long carries out straightening operation using straightener, and the copper tube billet after aligning, which is put into tube rolling slot, carries out rolling operation, rolls
Size is Φ 42.0*2.10mm after system, and controlled rolling speed is 0.5m/min, and the copper pipe after rolling is received with coiler to Φ 3.5m
Round charging basket in；
C, disk is drawn：Copper tube billet after rolling is drawn by 9, is processed into the semi-finished product of Φ 12.70*0.30mm, per pass
The main technologic parameters of drawing are：
First passage：Supplied materials size is Φ 42.0*2.10mm, and external mold size is Φ 36.0mm, and internal model size is Φ
32.6*36.5mm, working modulus 1.47, drawing rate are 380m/min；
Second passage：Supplied materials size is Φ 36.0*1.70mm, and external mold size is Φ 31.0mm, and internal model size is Φ 28.2*
31.5mm, working modulus 1.41, drawing rate are 400m/min；
Third passage：Supplied materials size is Φ 31.0*1.40mm, and external mold size is Φ 27.0mm, and internal model size is Φ
24.74*27.50mm working modulus 1.42, drawing rate is 450m/min；
Four-pass：Supplied materials size is Φ 27.0*1.13mm, and external mold size is Φ 23.4mm, and internal model size is Φ
21.56*23.90mm working modulus 1.42, drawing rate is 450m/min；
5th passage：Supplied materials size is Φ 23.4*0.92mm, and external mold size is Φ 20.8mm, and internal model size is Φ
19.34*21.20mm working modulus 1.41, drawing rate is 500m/min；
6th passage：Supplied materials size is Φ 20.8*0.73mm, and external mold size is Φ 18.6mm, and internal model size is Φ
17.44*13.95mm working modulus 1.42, drawing rate is 550m/min；
7th passage：Supplied materials size is Φ 18.6*0.58mm, and external mold size is Φ 16.50mm, and internal model size is Φ
15.60*17.00mm working modulus 1.42, drawing rate is 600m/min；
8th passage：Supplied materials size is Φ 16.5*0.46mm, and external mold size is Φ 14.50mm, and internal model size is Φ
13.76*15.00mm working modulus 1.41, drawing rate is 650m/min；
9th passage：Supplied materials size is Φ 14.50*0.37mm, and external mold size is Φ 12.70mm, and internal model size is Φ
12.10*13.20mm working modulus 1.40, drawing rate is 700m/min；
D, inner wall washing：Copper pipe inner wall after disk is drawn has a large amount of lubricating oil, the copper after compressed air need to being utilized to draw disk
Inside pipe wall is cleaned, and the air pressure of compressed air is 8MPa, sponge fragment is filled in pipe, under the drive of compressed air
Play the role of cleaning；
E, online induction annealing：Copper pipe after cleaning is hoisted to progress online annealing, online annealing work(at online annealing
Rate is 100KW, annealing rate 40m/min, copper pipe elongation percentage >=45% after annealing；
F, forming internal threads：The smooth copper for having moved back fire is subjected to forming internal threads, internal thread tooth form is spiral shape, screw thread
The number of teeth of tooth is 30, transverse tooth thickness 0.20mm, space width 0.63mm, and addendum angle is 50 ° 24 ', and helical angle is 45 °.Molding speed
Degree is 40-50m/min, tensile strength 300MPa, elongation percentage >=40%；
G, after-combustion：The inner screw thread copper pipe of Φ 3.5m material frame take-ups is subjected to after-combustion, in packing to 1.2m material frames, after-combustion process
Rate be 200m/min, with strap be packaged after the completion of after-combustion and divide disk, send to annealed zone；
H, well furnace：Inner screw thread copper pipe in 1.2m material frames is hung in shaft furnace, carries out annealing operation so that copper pipe
Tensile strength >=240Mpa, elongation percentage >=35%, conductivity 100%IACS；
I, fall disk：For convenience of transporting and storing, copper pipe shallow bid copper pipe is hoisted on the pay off rack of falling disk, the work of falling disk is carried out
Industry, the speed control of falling disk are 120m/min, and when after-combustion should avoid drawing copper pipe flat；
J, packaging and storage：Physical and chemical inspection is carried out to the copper pipe fallen after the completion of disk, the oxygen content for testing oxygen-free copper pipe is less than
8ppm, tensile strength are more than 240MPa, and elongation percentage is more than 35%, and ovality is less than 3%, is carried out using pearl cotton and plastic film
Packaging, prevents copper pipe damaging in transportational process and aoxidizes.
One embodiment of the invention is described in detail above, but the content is only the invention
Preferred embodiment should not be construed as limiting the practical range of the invention.It is all to be made according to the invention application range
All the changes and improvements etc., belong within the patent covering scope of the invention.
Claims (2)
1. a kind of preparation process of radio-frequency cable inner screw thread copper pipe, it is characterised in that：The copper tube size is Φ 12.70*
0.30mm, it is internal that there is thread, and the number of teeth of thread is 30, transverse tooth thickness 0.20mm, space width 0.63mm, tooth top
Angle is 50 ° 24 ', and helical angle is 45 °, and preparation process includes the following steps：
A, continuous up-casting skirt：Using Cu-CATH-1 as raw material, melting in melting furnace is added, smelting temperature is maintained at 1160-
1180 DEG C, the graphite powdered carbon of 80-150mm thickness is added into melting furnace as coverture, copper liquid passes through side bottom in melting furnace
Portion flows ditch and flows into holding furnace, and control heat preservation in-furnace temperature is maintained at 1155-1175 DEG C, and high purity graphite scale is used in holding furnace
As coverture, pre- consolidated degassing process carried out to copper liquid before skirt, by liquid level control is 40-60mm when normal skirt,
It is used in combination the graphite guide tube of a diameter of 30mm to be passed through high pure nitrogen, uninterrupted 1.0L/min, to remove gas in stove into copper liquid
Body, by the Control for Oxygen Content in copper liquid in 8ppm hereinafter, drawing the bright and clean flawless of pipe surface requirements；
B, billet production：The oxygen-free copper pipe cutting on line saw that the specification that above-mentioned steps a is produced is Φ 85*11mm cuts 10m
Long pipe carries out straightening operation using straightener, and the copper tube billet after aligning, which is put into tube rolling slot, carries out rolling operation, after rolling
Size is Φ 42.0*2.10mm, and controlled rolling speed is 0.5m/min, and the copper pipe after rolling is received with coiler to the circle of Φ 3.5m
In shape charging basket；
C, disk is drawn：Copper tube billet after rolling is drawn by 9, is processed into the semi-finished product of Φ 12.70*0.30mm, per pass is drawn
Main technologic parameters be：
First passage：Supplied materials size is Φ 42.0*2.10mm, and external mold size is Φ 36.0mm, and internal model size is Φ 32.6*
36.5mm, working modulus 1.47, drawing rate are 380m/min；
Second passage：Supplied materials size is Φ 36.0*1.70mm, and external mold size is Φ 31.0mm, and internal model size is Φ 28.2*
31.5mm, working modulus 1.41, drawing rate are 400m/min；
Third passage：Supplied materials size is Φ 31.0*1.40mm, and external mold size is Φ 27.0mm, and internal model size is Φ 24.74*
27.50mm, working modulus 1.42, drawing rate are 450m/min；
Four-pass：Supplied materials size is Φ 27.0*1.13mm, and external mold size is Φ 23.4mm, and internal model size is Φ 21.56*
23.90mm, working modulus 1.42, drawing rate are 450m/min；
5th passage：Supplied materials size is Φ 23.4*0.92mm, and external mold size is Φ 20.8mm, and internal model size is Φ 19.34*
21.20mm, working modulus 1.41, drawing rate are 500m/min；
6th passage：Supplied materials size is Φ 20.8*0.73mm, and external mold size is Φ 18.6mm, and internal model size is Φ 17.44*
13.95mm, working modulus 1.42, drawing rate are 550m/min；
7th passage：Supplied materials size is Φ 18.6*0.58mm, and external mold size is Φ 16.50mm, and internal model size is Φ 15.60*
17.00mm, working modulus 1.42, drawing rate are 600m/min；
8th passage：Supplied materials size is Φ 16.5*0.46mm, and external mold size is Φ 14.50mm, and internal model size is Φ 13.76*
15.00mm working modulus 1.41, drawing rate is 650m/min；
9th passage：Supplied materials size is Φ 14.50*0.37mm, and external mold size is Φ 12.70mm, and internal model size is Φ 12.10*
13.20mm, working modulus 1.40, drawing rate are 700m/min；
D, inner wall washing：Copper pipe inner wall after disk is drawn has a large amount of lubricating oil, in the copper pipe after compressed air need to being utilized to draw disk
Wall is cleaned, and the air pressure of compressed air is 8MPa, and sponge fragment is filled in pipe, is played under the drive of compressed air
The effect of cleaning；
E, online induction annealing：Copper pipe after cleaning, which is hoisted to progress online annealing, online annealing power at online annealing, is
100KW, annealing rate 40m/min, copper pipe elongation percentage >=45% after annealing；
F, forming internal threads：The smooth copper for having moved back fire is subjected to forming internal threads, internal thread tooth form is spiral shape, thread
The number of teeth is 30, transverse tooth thickness 0.20mm, space width 0.63mm, and addendum angle is 50 ° 24 ', and helical angle is 45 °, and shaping speed is
40-50m/min, tensile strength 300MPa, elongation percentage >=40%；
G, after-combustion：The inner screw thread copper pipe of Φ 3.5m material frame take-ups is subjected to after-combustion, in packing to Φ 1.2m material frames, after-combustion process
Rate is 200m/min, with strap be packaged after the completion of after-combustion and divides disk, send to annealed zone；
H, well furnace：Inner screw thread copper pipe in Φ 1.2m material frames is hung in shaft furnace, carries out annealing operation so that copper pipe
Tensile strength >=240Mpa, elongation percentage >=35%, conductivity 100%IACS；
I, fall disk：For convenience of transporting and storing, copper pipe shallow bid copper pipe is hoisted on the pay off rack of falling disk, carries out the operation of falling disk,
Disk speed control is 120m/min, and when after-combustion should avoid drawing copper pipe flat；
J, packaging and storage：Physical and chemical inspection is carried out to the copper pipe fallen after the completion of disk, the oxygen content for testing oxygen-free copper pipe is less than 8ppm, resists
Tensile strength is more than 240MPa, and elongation percentage is more than 35%, and ovality is less than 3%, is packed using pearl cotton and plastic film, prevents
Only copper pipe damaging in transportational process and aoxidize.
2. a kind of preparation process of radio-frequency cable inner screw thread copper pipe according to claim 1, it is characterised in that：The step
Suddenly the technological parameter of the annealing operation in h is：Annealing temperature：390-410℃；Heating-up time：240min；Soaking time：
120min；Evacuated pressure：-0.1MPa；Nitrogen pressure：0.05-0.1MPa；The inflated with nitrogen time：15min；Tapping temperature：36-
40℃。
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| CN107738067A (en) * | 2017-09-13 | 2018-02-27 | 中天合金技术有限公司 | A kind of random length half-hard state copper pipe bus production technology |
| CN107737890B (en) * | 2017-09-20 | 2019-04-16 | 中天合金技术有限公司 | A kind of preparation method of radio frequency coaxial-cable oxygen-free copper pipe |
| CN107538186A (en) * | 2017-09-26 | 2018-01-05 | 中天合金技术有限公司 | A kind of production technology of up-drawing method thin-walled light copper pipe |
| CN107962085B (en) * | 2017-12-26 | 2024-04-26 | 金龙精密铜管集团股份有限公司 | Integrated machine and method for annealing metal pipe and forming internal threads |
| CN109127844A (en) * | 2018-08-21 | 2019-01-04 | 冯境铭 | Pipes processing method and system |
| CN109127770A (en) * | 2018-08-21 | 2019-01-04 | 佛山市顺德区精艺万希铜业有限公司 | Mosquito-repellent incense type dissipates greatly disk production method and system |
| CN109848380B (en) * | 2019-01-28 | 2021-04-30 | 青岛富泰兴碳素制品有限公司 | Copper material processing technology using up-drawing furnace |
| CN109813172A (en) * | 2019-03-18 | 2019-05-28 | 青岛登辉机械配件有限公司 | Inner screw thread copper pipe and its processing technology |
| CN111112252A (en) * | 2019-12-12 | 2020-05-08 | 上海龙阳精密复合铜管有限公司 | Novel method for cleaning inner groove pipe |
| CN112444154B (en) * | 2020-11-25 | 2022-03-22 | 龙口市龙蓬精密铜管有限公司 | Equivalent lightweight internal thread copper pipe and preparation method thereof |
| CN112474806B (en) * | 2020-12-21 | 2022-09-13 | 宁波金田铜管有限公司 | Preparation method of internal thread special-shaped copper pipe |
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| CN201196890Y (en) * | 2008-09-07 | 2009-02-18 | 江苏俊知技术有限公司 | Coaxial cable for mobile communication |
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