CN114769349B - Preparation method of ultra-wide large-size titanium-coated copper composite profile - Google Patents
Preparation method of ultra-wide large-size titanium-coated copper composite profile Download PDFInfo
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- CN114769349B CN114769349B CN202210280270.7A CN202210280270A CN114769349B CN 114769349 B CN114769349 B CN 114769349B CN 202210280270 A CN202210280270 A CN 202210280270A CN 114769349 B CN114769349 B CN 114769349B
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 109
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 109
- 239000010949 copper Substances 0.000 title claims abstract description 109
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 239000010936 titanium Substances 0.000 title claims abstract description 77
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 77
- 239000002131 composite material Substances 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000005096 rolling process Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 230000009467 reduction Effects 0.000 claims description 7
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 238000003475 lamination Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000001953 recrystallisation Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- IUYOGGFTLHZHEG-UHFFFAOYSA-N copper titanium Chemical compound [Ti].[Cu] IUYOGGFTLHZHEG-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009854 hydrometallurgy Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/0805—Flat bars, i.e. having a substantially rectangular cross-section
-
- 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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/003—Drawing materials of special alloys so far as the composition of the alloy requires or permits special drawing methods or sequences
-
- 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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/18—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes from stock of limited length
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention discloses a preparation method of an ultra-wide large-size titanium-coated copper composite section bar, which comprises the following steps: inserting a copper rod into a titanium tube to obtain a titanium-clad copper rod, heating, drawing and air cooling to obtain a titanium-clad copper composite rod, performing three-roller planetary rolling on the titanium-clad copper composite rod to obtain a titanium-clad copper rolled piece, and finally performing multi-pass roller die drawing on the titanium-clad copper rolled piece to obtain a titanium-clad copper composite section, wherein the multi-pass roller die drawing process is as follows: rolling the round section of the titanium-clad copper rolled piece into an ellipse by the first-pass roller die drawing, enabling the section to be rectangular by the second-pass roller die drawing, and then continuously taking the ellipse-rectangle as a cycle, and alternately performing roller die drawing; the number of the roller die drawing passes is not less than 6. The composite profile obtained by the invention has excellent conductivity of copper, maintains high strength and corrosion resistance of titanium, and simultaneously has uniform force application in the roller die drawing process, so that the lamination defect caused by uneven processing force application can be effectively avoided, the bonding strength is ensured, and the metallurgical bonding is realized.
Description
Technical Field
The invention belongs to the technical field of processing of titanium-coated copper composite profiles, and particularly relates to a preparation method of an ultra-wide large-size titanium-coated copper composite profile.
Background
Copper is a nonferrous metal with long use history and good conductivity, and is the current conductive material with the largest consumption in the world, however, people have to protect the nonferrous metal in order to ensure that the nonferrous metal can effectively work in a corrosive environment due to the defects of low strength, poor corrosion resistance and the like. In recent years, titanium alloy has high strength ratio, and has good corrosion resistance to corrosive substances such as chloride, sulfide and the like, so that the titanium alloy is widely applied to various industries. The titanium-coated copper composite section bar has excellent conductivity of copper and keeps high strength and corrosion resistance of titanium, and is widely applied to the fields of hydrometallurgy, electrolytic plating, chlor-alkali and the like.
At present, the conventional methods for manufacturing the titanium-clad copper section bar generally have the problems of low yield, poor surface quality of the section bar and the like, such that the conventional method for manufacturing the titanium-clad copper composite section bar by rolling solves the problems. The large-size titanium-clad copper composite profile has large size and large processing deformation, and the processing process has important influence on the size and performance of the product. However, the size of the titanium-copper-clad composite section bar manufactured by rolling is mostly a middle-small-size section bar, the size and the precision are difficult to control, and a specific processing technology does not exist for the large-size titanium-copper-clad composite section bar.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the preparation method of the ultra-wide large-size titanium-clad copper composite section, the outer diameter of the prepared titanium-clad copper composite section is more than 30mm, the metallurgical bonding of a titanium pipe and a copper material is realized, the service performance requirement in a corrosive environment can be met, and the application market of the ultra-wide large-size titanium-clad copper composite section is developed.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention discloses a preparation method of an ultra-wide large-size titanium-coated copper composite section bar, which comprises the following steps:
inserting a copper rod into a titanium tube to obtain a titanium-clad copper rod, heating, drawing and air cooling to obtain a titanium-clad copper composite rod, performing three-roller planetary rolling on the titanium-clad copper composite rod to obtain a titanium-clad copper rolled piece, and finally performing multi-pass roller die drawing on the titanium-clad copper rolled piece to obtain a titanium-clad copper composite section, wherein the multi-pass roller die drawing process is as follows: rolling the round section of the titanium-clad copper rolled piece into an ellipse by the first-pass roller die drawing, enabling the section to be rectangular by the second-pass roller die drawing, and then continuously taking the ellipse-rectangle as a cycle, and alternately performing roller die drawing; the number of the roller die drawing passes is not less than 6.
According to the preparation method, the heated titanium-clad copper rod is drawn, so that the titanium tube and the copper rod are tightly combined without gaps, the titanium-clad copper composite rod is obtained, then the titanium-clad copper composite rod is subjected to three-roller planetary rolling, so that the titanium tube and the copper rod are subjected to dynamic recrystallization, and finally the titanium-clad copper rolled piece is subjected to multi-pass roller die drawing, so that metallurgical bonding is formed between the titanium and the copper. In addition, in the roller die drawing process, roller die drawing is firstly carried out to form an ellipse, and then roller die drawing is carried out to form a rectangle alternately, and the inventor finds that the performance of the finally obtained titanium-copper-clad composite section is optimal.
In the actual operation process, before the copper bar is inserted into the titanium tube, the surface of the copper bar and the surface of the inner wall of the titanium tube are cleaned and dried.
In a preferred scheme, the diameter of the copper rod is 60-78mm, the outer diameter of the titanium tube is 85-100mm, and the thickness of the titanium tube is 8-10mm.
In a preferred scheme, the copper rod is a T2 copper rod, and the titanium tube is a TA1 titanium tube.
The inventor finds that the performance of the titanium-coated copper composite section obtained by adopting the composite of the T2 type copper rod and the TA1 titanium tube is optimal.
Preferably, the heating temperature is 820-880 ℃, and the heating time is 1-2h.
In the preferred scheme, the heated titanium-coated copper rod is drawn, so that the titanium tube and the copper rod are tightly combined without gaps. In the invention, the heated titanium-clad copper rod is drawn, so that the titanium tube and the copper rod are tightly combined without gaps, and the dynamic recrystallization of titanium and copper can be realized under the combined actions of three-roller planetary rolling and roller die drawing, and finally the metallurgical combination is obtained.
In the preferable scheme, the deformation of the three-roller planetary rolling is more than or equal to 30%, and is preferably 30% -35%.
In the invention, the three-roller planetary rolling deformation is important, more than 30% of deformation is needed to ensure that the dynamic recrystallization can be realized by generating deformation heat, and if the deformation is too small to realize dynamic recrystallization, the next multi-pass roller die drawing can not realize metallurgical bonding, and even the copper and titanium interface is cracked.
Preferably, the three-roller planetary rolling is carried out at room temperature.
Preferably, the roller die drawing is performed at room temperature.
In a preferred scheme, the number of passes of the roller die drawing is 6-9.
In a preferred scheme, the reduction of the first pass is less than or equal to 30%, preferably 25-30% when the roller die is used for drawing; the reduction of the rest pass is less than 15%, preferably 10-15%.
In the three-roller planetary rolling process, relatively large deformation is adopted, so that metallurgical bonding of titanium and copper is realized, and then smaller deformation is adopted, so that the size change and the machining precision are improved. In the invention, the deformation of the roller die drawing needs to be effectively controlled, in the first pass, a slightly larger deformation is used, if the deformation is too small, no further metallurgical bonding can be formed, and later small deformation is needed, and if the subsequent deformation is too large, the bonding surface of titanium and copper can be separated due to deformation.
Principle and advantages
According to the preparation method, the heated titanium-clad copper rod is drawn, so that the titanium tube and the copper rod are tightly combined without gaps, the titanium-clad copper composite rod is obtained, then the titanium-clad copper composite rod is subjected to three-roller planetary rolling, so that the titanium tube and the copper rod are dynamically recrystallized, finally the titanium-clad copper rolled piece is subjected to multi-pass roller die drawing, so that metallurgical bonding is formed between titanium and copper.
In the preparation process of the invention, firstly, the titanium clad copper composite rod with the titanium tube and the copper rod tightly combined without gaps is controlled to be obtained, then three-roller planetary rolling can be carried out, in the three-roller planetary rolling, the deformation in the processing process is more than 30%, the contact surface of the titanium tube and the copper rod is dynamically recrystallized in the deformation process due to deformation heat generated by large deformation, finally, when the first pass of roller die drawing is carried out under the condition of larger deformation of Cheng Tuo circles, metallurgical bonding is further generated, crystal grains are thinned, in the later pass deformation process, the size is mainly changed, the processing precision is improved, and finally, the titanium copper composite section with the large width is obtained.
The method for manufacturing the ultra-wide large-size titanium-coated copper composite section has the advantages of simple and efficient process equipment, high product quality and precision and low processing cost.
Drawings
FIG. 1 is a cross-sectional view of an ultra-wide large-size titanium-clad copper composite profile.
Detailed Description
The following detailed description of specific embodiments of the invention is further detailed in conjunction with the accompanying drawings:
referring to fig. 1, the manufacturing method of the ultra-wide large-size titanium-clad copper composite section bar comprises the following steps:
example 1
Cleaning and drying the surface of a T2 copper rod 1 with the diameter of 78mm and the surface of the inner wall of a TA1 titanium tube 2 with the diameter of 100mm and the thickness of 10mm, and inserting the copper rod 1 into the titanium tube 2; heating the titanium-coated copper rod in an electric furnace at 880 ℃; heating for 1.2 hours, pulling the heated titanium-clad copper rod, and air-cooling to tightly combine the titanium tube 2 and the copper rod 1; and (3) performing three-roller planetary rolling with the deformation of 30% on the obtained composite titanium clad copper rod, performing 6-pass roller die drawing on the obtained rolled piece, wherein the roller with the round section is drawn into an ellipse by the first-pass roller drawing, the section is made into a rectangle by the first-pass roller drawing, and the cycle roller drawing is performed for 4 times continuously by taking the ellipse-rectangle as the cycle roller drawing. Wherein the rolling reduction of the first pass is 30%, and the deformation of the rest passes is 10%. The final product was 40X 100mm in cross-sectional dimensions, with a titanium layer thickness of 5mm. The bonding strength of the obtained product titanium tube and the copper bar reaches 55MPa, the tensile strength reaches 285MPa, the yield strength reaches 296MPa, the elongation after breaking is 35%, the compound (bonding) rate of the product reaches 99.5%, and the national requirements are met.
Example 2
Cleaning and drying the surface of a T2 copper rod 1 with the diameter of 60mm and the surface of the inner wall of a TA1 titanium tube 2 with the diameter of 80mm and the thickness of 9mm, and inserting the copper rod 1 into the titanium tube 2; heating the titanium-coated copper rod in an electric furnace at 820 ℃; the heating time is 1 hour, the heated titanium-clad copper rod is drawn and air-cooled, so that the titanium tube 2 and the copper rod 1 are tightly combined; and (3) performing three-roller planetary rolling with the deformation of 32% on the obtained composite titanium clad copper rod, then performing 6-pass roller die drawing, wherein the roller with the circular section is drawn into an ellipse by the first-pass roller drawing, the section is drawn into a rectangle by the first-pass roller drawing, and then the roller drawing is performed for 4 times alternately by continuously taking the ellipse-rectangle as a circulation. Wherein the rolling reduction of the first pass is 30%, and the deformation of the rest passes is 10%. The final product was 40X 90mm in cross-sectional dimensions, with a titanium layer thickness of 4.5mm. The bonding strength of the obtained product titanium tube and the copper bar reaches 55MPa, the tensile strength is 286MPa, the yield strength is 295MPa, the elongation after breaking is 38%, the compound (bonding) rate of the product reaches 99.5%, and the national requirements are met.
Example 3
Cleaning and drying the surface of a T2 copper rod 1 with the diameter of 60mm and the surface of the inner wall of a TA1 titanium tube 2 with the diameter of 80mm and the thickness of 9mm, and inserting the copper rod 1 into the titanium tube 2; heating the titanium-coated copper rod in an electric furnace at 850 ℃; the heating time is 1 hour, and the heated titanium-clad copper rod is drawn and air-cooled to tightly combine the titanium tube 2 and the copper rod 1; and (3) performing three-roller planetary rolling with the deformation of not less than 32% on the obtained composite titanium clad copper rod, performing six-pass roller die drawing, wherein the roller with the circular section is drawn into an ellipse by the first-pass roller drawing, the section is rectangular by the first-pass roller drawing, and the rear-pass roller drawing is alternately performed for 4 times. Wherein the rolling reduction of the first pass is 30%, and the deformation of the rest passes is 10%. The final product was obtained with a cross-sectional dimension of 30X 100mm, wherein the thickness of the titanium layer was 5mm. The bonding strength of the titanium tube and the copper bar of the obtained product reaches 55MPa, the tensile strength is 297MPa, the yield strength is 318MPa, the elongation after breaking is 36%, the compound (bonding) rate of the product reaches 99.5%, and the national requirements are met.
Comparative example 1
Other conditions were the same as in example 1 except that the drawing was not performed, but the roll die drawing was directly performed, and as a result, a metallurgically bonded composite profile was not obtained.
Comparative example 2
The same conditions as in example 1 were used except that a titanium-based composite tube having a rectangular cross section was rolled by drawing and extrusion processes and then by rolling. The heating process is the same as the patent, the heating process adopts a resistance furnace to heat and preserve heat for a certain time and then rolling, the heating temperature is 880 ℃, the preserving heat time is 30min, the titanium-based composite material with the diameter of 60mm is adopted to process the titanium-based composite material into a rectangular titanium-based composite material with the diameter of 65 multiplied by 12, and the titanium-based composite material is rolled into a titanium-based composite material with the thickness of 30mm and the cross section area of 1800mm in the first pass 2 Finally, a rectangular titanium matrix composite of 65×12 was rolled. The bar obtained through rolling is distorted due to the lack of a drawing process during discharging, and the external dimension tolerance is not well controlled.
Comparative example 3
Other conditions were the same as in example 1 except that the deformation amount of the three-roll planetary rolling was 20%, and as a result, a metallurgically bonded composite profile was not obtained.
Claims (7)
1. A preparation method of an ultra-wide large-size titanium-clad copper composite profile is characterized by comprising the following steps: the method comprises the following steps: inserting a copper rod into a titanium tube to obtain a titanium-clad copper rod, heating, drawing and air cooling to obtain a titanium-clad copper composite rod, performing three-roller planetary rolling on the titanium-clad copper composite rod to obtain a titanium-clad copper rolled piece, and finally performing multi-pass roller die drawing on the titanium-clad copper rolled piece to obtain a titanium-clad copper composite section, wherein the multi-pass roller die drawing process is as follows: rolling the round section of the titanium-clad copper rolled piece into an ellipse by the first-pass roller die drawing, enabling the section to be rectangular by the second-pass roller die drawing, and then continuously taking the ellipse-rectangle as a cycle, and alternately performing roller die drawing;
the deformation of the three-roller planetary rolling is more than or equal to 30%;
the number of times of roller die drawing is 6-9 times;
when the roller die is used for drawing, the reduction of the first pass is less than or equal to 30%, and the reduction of the rest passes is less than 15%.
2. The method for preparing the ultra-wide large-size titanium-coated copper composite profile according to claim 1, which is characterized in that: the diameter of the copper rod is 60-78mm, the outer diameter of the titanium tube is 85-100mm, and the thickness of the titanium tube is 8-10mm.
3. The method for preparing the ultra-wide large-size titanium-coated copper composite profile according to claim 1, which is characterized in that: the copper bar is a T2 copper bar, and the titanium tube is a TA1 titanium tube.
4. The method for preparing the ultra-wide large-size titanium-coated copper composite profile according to claim 1, which is characterized in that: the heating temperature is 820-880 ℃, and the heating time is 1-2h.
5. The method for preparing the ultra-wide large-size titanium-coated copper composite profile according to claim 1, which is characterized in that: drawing the heated titanium-clad copper rod to enable the titanium tube and the copper rod to be tightly combined without gaps.
6. The method for preparing the ultra-wide large-size titanium-coated copper composite profile according to claim 1, which is characterized in that: the three-roller planetary rolling is carried out at room temperature.
7. The method for preparing the ultra-wide large-size titanium-coated copper composite profile according to claim 1, which is characterized in that: the roll die drawing is performed at room temperature.
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| CN202210280270.7A CN114769349B (en) | 2022-03-22 | 2022-03-22 | Preparation method of ultra-wide large-size titanium-coated copper composite profile |
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| CN202210280270.7A CN114769349B (en) | 2022-03-22 | 2022-03-22 | Preparation method of ultra-wide large-size titanium-coated copper composite profile |
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| CN114769349A CN114769349A (en) | 2022-07-22 |
| CN114769349B true CN114769349B (en) | 2024-04-05 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000176539A (en) * | 1998-12-10 | 2000-06-27 | Hitachi Cable Ltd | Manufacture of flat tube |
| CN101121184A (en) * | 2007-09-07 | 2008-02-13 | 宝鸡市亚钛新金属有限公司 | Method for manufacturing titanium base composite pipe-rod materials |
| CN101214494A (en) * | 2007-12-29 | 2008-07-09 | 莱芜钢铁集团有限公司 | Technique for rolling figured steel for magnetic suspension train rail |
| CN103203380A (en) * | 2013-03-21 | 2013-07-17 | 西安思维金属材料有限公司 | Titanium and titanium alloy wire processing method |
| CN103203391A (en) * | 2013-01-06 | 2013-07-17 | 金龙精密铜管集团股份有限公司 | Production method for copper-titanium composite tube |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10210968C1 (en) * | 2002-03-13 | 2003-06-18 | Edscha Cabrio Dachsys Gmbh | Extruded profile for motor vehicle sliding roof has two interlocking rails section with projecting strip on one engaging correspondingly shaped recess in other |
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- 2022-03-22 CN CN202210280270.7A patent/CN114769349B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000176539A (en) * | 1998-12-10 | 2000-06-27 | Hitachi Cable Ltd | Manufacture of flat tube |
| CN101121184A (en) * | 2007-09-07 | 2008-02-13 | 宝鸡市亚钛新金属有限公司 | Method for manufacturing titanium base composite pipe-rod materials |
| CN101214494A (en) * | 2007-12-29 | 2008-07-09 | 莱芜钢铁集团有限公司 | Technique for rolling figured steel for magnetic suspension train rail |
| CN103203391A (en) * | 2013-01-06 | 2013-07-17 | 金龙精密铜管集团股份有限公司 | Production method for copper-titanium composite tube |
| CN103203380A (en) * | 2013-03-21 | 2013-07-17 | 西安思维金属材料有限公司 | Titanium and titanium alloy wire processing method |
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