CN102172665A - High-precision aluminum alloy rectangular tube forming method - Google Patents
High-precision aluminum alloy rectangular tube forming method Download PDFInfo
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- CN102172665A CN102172665A CN2011100009271A CN201110000927A CN102172665A CN 102172665 A CN102172665 A CN 102172665A CN 2011100009271 A CN2011100009271 A CN 2011100009271A CN 201110000927 A CN201110000927 A CN 201110000927A CN 102172665 A CN102172665 A CN 102172665A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title abstract description 17
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims abstract description 5
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims abstract description 4
- 238000000137 annealing Methods 0.000 claims abstract description 4
- 238000005097 cold rolling Methods 0.000 claims abstract description 4
- 239000010727 cylinder oil Substances 0.000 claims abstract description 4
- 238000001125 extrusion Methods 0.000 claims abstract description 4
- 238000001192 hot extrusion Methods 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims description 19
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 4
- 239000004411 aluminium Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 abstract 2
- 150000003839 salts Chemical class 0.000 abstract 1
- 239000000047 product Substances 0.000 description 12
- 238000013459 approach Methods 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 238000004513 sizing Methods 0.000 description 11
- 238000012545 processing Methods 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 239000007795 chemical reaction product Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 241000446313 Lamella Species 0.000 description 1
- 238000010621 bar drawing Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
一种高精度铝合金矩形管成形方法，步骤如下：a)将已制备好的牌号为6061的铝合金铸锭均火加热至415±5℃，并保持1-2hr；b)在预热温度为400℃的挤压分流模具上热挤压制得初始毛料管坯；c)盐浴退火处理；d)将步骤c)所得毛料管坯冷轧成圆管；e)将步骤d)所得圆管坯放入38#汽缸油中浸泡24hr；f)将步骤e)所得管坯空拉拔为近似矩形管；g)将步骤f)所得近似矩形管通过矩形矫正模带芯棒拉拔为矩形管；h)将步骤g)所得矩形管带芯棒拉拔成成品管。本发明有效地改善了成品管材的尺寸精度及表面质量，解决了拉拔过程中管坯拉断，角部出现明显横向裂纹的问题，使产品的使用性能及寿命得到大幅度的提高。
A high-precision aluminum alloy rectangular tube forming method, the steps are as follows: a) uniformly heat the prepared aluminum alloy ingot of brand 6061 to 415±5°C, and keep it for 1-2hr; b) at the preheating temperature hot extrusion on an extrusion splitter die at 400°C to obtain the initial raw material tube; c) salt bath annealing treatment; d) cold rolling the raw material tube obtained in step c) into a round tube; e) making the round tube obtained in step d) Put the tube blank in 38# cylinder oil and soak for 24hr; f) draw the tube blank obtained in step e) into an approximately rectangular tube; g) draw the approximately rectangular tube obtained in step f) into a rectangle through a rectangular correcting mold belt mandrel tube; h) drawing the rectangular tube with a mandrel obtained in step g) into a finished tube. The invention effectively improves the dimensional accuracy and surface quality of the finished pipe, solves the problem that the pipe blank is broken during the drawing process and the corners have obvious transverse cracks, and greatly improves the service performance and service life of the product.
Description
Technical field
The invention belongs to the metal material processing technical field, particularly a kind of manufacturing process of high-accuracy aluminum alloy rectangular tube.
Background technology
The high-accuracy aluminum alloy rectangular tube is widely used in important sciemtifec and technical spheres such as Aeronautics and Astronautics, radar, remote measurement and telecommunication as the critical elements of radio microwave communication navigator.Because the work and the particularity of environment for use, the comparatively requirement of strictness has been proposed all for the dimensional accuracy and the inner surface quality of such rectangular tube.At present, in actual production, prepare such tubing and mainly adopt: the drawing forming scheme of initial circular pipe blank-transition ellipse-finished product rectangle.But, because the blank tube material distortion is unreasonable, uniformity and uniformity that the metal particle flows are relatively poor, tending to pipe to occur in the process breaks, the bight forms transversal crack, dimension overproof, shaping problem such as wall unevenness and inside surface roughness are not up to standard has seriously influenced the serviceability of product.Find that by summing up knowhow the formulation of technology and Mould design and processing are two of paramount importance key elements that influence production tube quality precision.Therefore, formulate rational production technology scheme, the machining accuracy of the mould structure of excellent in design and raising mould is to solve the actual production defect problem, produces the key measure of the finished product rectangular tube that meets design and operational requirement.
Summary of the invention
Purpose of the present invention is exactly in order to overcome above-mentioned the deficiencies in the prior art, a kind of manufacturing process of aluminum rectangular tube is provided, this method can effectively be improved the dimensional accuracy and the surface quality of finished product tubing, improve the serviceability and the life-span of product, pipe is broken in the solution drawing process, and the problem of obvious transversal crack appears in the bight.
For achieving the above object, the manufacturing process concrete steps of high-accuracy aluminum alloy rectangular tube involved in the present invention are as follows:
A) trade mark that will prepare is that 6061 the equal fire of aluminium alloy cast ingot is heated to 415 ± 5 ℃, and keeps 1-2 hour;
B) step a) gained ingot casting being heated to 450 ℃, is that hot extrusion makes initial woollen pipe on 400 ℃ the Extrusion Porthole Die for Aluminium Profiles tool in preheat temperature then;
C) the woollen pipe of step b) gained being carried out temperature is 500 ℃, and the liquid annealing of insulation 30min is handled;
D) pipe that is Ф 92.6 * 2.16mm with the cold rolling one-tenth dimensions of the woollen pipe of step c) gained;
E) step d) gained circular pipe blank being put into the 38# steam cylinder oil soaked 24 hours;
F) be approximate rectangular pipe with the empty drawing of step e) gained pipe;
G) the approximate rectangular pipe of step f) gained being corrected the drawing of mould cored bar by rectangle is rectangular tube;
H) be that dimensions is the production tube of 90.12 * 45.16 * 2.06mm with the drawing of step g) gained rectangular tube cored bar.
The manufacturing process of high-accuracy aluminum alloy rectangular tube involved in the present invention has the following advantages and effect: 1) the initial circular pipe blank inside crystal grain that makes by extruding and the rolling technology that matches and rational heat treatment method is tiny, dense structure, surface quality is better, good mechanical performance is for follow-up multi-pass drawing process has been established solid foundation.2) join the mould scheme by the drawing that has designed circular pipe blank-approximate rectangular-rectification rectangle-finished product, with the level and smooth stable final rectangle that carries out the transition to of initial circular pipe blank, reduced the inhomogeneities of flow of metal greatly, improved the forming quality of production tube effectively, forming dimension precision and surface smoothness are significantly improved.3) on the basis of original traditional moulds, will improve the most significant end product drawing die corner profile of production tube quality influence, effectively balance the complexity of flow of metal between pipe bight and the limit portion, improved the uniformity of being out of shape.4) new process program has reduced shaping load significantly, has eliminated the transversal crack that production tube bight in original method occurs, and the phenomenon broken does not appear in pipe.
Description of drawings
Fig. 1 is the structural representation of the empty drawing-die tool of used transition in the step f) of the present invention;
Fig. 2 is the AOA profile of Fig. 1;
Fig. 3 is the structural representation that used rectangle is corrected mould in the step g);
Fig. 4 is the BOB profile of Fig. 3;
Fig. 5 cooperates the structural representation of correcting the used long plug of mould in the step g);
Fig. 6 is the COC profile of Fig. 5;
Fig. 7 is step h) in the structural representation of used end product drawing mould;
Fig. 8 is the DOD profile of Fig. 7;
Fig. 9 is the bight zoomed-in view E of Fig. 7 mould;
Figure 10 is step h) the middle structural representation that cooperates the used short core print of finished product drawing die;
Figure 11 is the FOF profile of Figure 10;
The three-dimensional structure schematic diagram of the high-accuracy aluminum alloy rectangular tube that Figure 12 makes for the inventive method.Wherein: 1) label of empty drawing-die is 1; 1-1,1-2,1-3,1-4 are expressed as the approach cone of sky drawing-die 1 respectively, Drawing cone, sizing area goes out prostomum; R
11, R
12, R
13, R
14Be respectively sky drawing-die 1 each continuous part knuckle radius; K
1, L
1The long and short limit correspondence that is respectively sky drawing-die 1 is gone into modular angle.
2) label of rectification mould is 2; 2-1,2-2,2-3,2-4 are expressed as the approach cone of correcting mould 2 respectively, Drawing cone, and sizing area goes out prostomum; R
21, R
22, R
23, R
24Be respectively and correct mould 2 each continuous part knuckle radius; K
2, L
2Be respectively the long and short limit correspondence of correcting mould 2 and go into modular angle.
3) be 3 with the label of correcting the long plug that mould is used; 3-1,3-2,3-3 are expressed as the approach cone of long plug 3 respectively, and sizing area goes out prostomum; R
3Be long plug 3 each continuous part knuckle radius.
4) label of finishing die is 4; 4-1,4-2,4-3,4-4 are expressed as the approach cone of finishing die 4 respectively, Drawing cone, sizing area goes out prostomum; R
41, R
42, R
43, R
44Be respectively finishing die 4 each continuous part knuckle radius; K
3, L
3The long and short limit correspondence that is respectively finishing die 4 is gone into modular angle.
5) R
E0, R
E1, R
E2Be expressed as mold profile fillet size among the partial enlarged view E.
6) label of the short core print that is used with finishing die is 5; 5-1,5-2,5-3 are expressed as the approach cone of short core print 5 respectively, and sizing area goes out prostomum; R
51Be short core print 5 each continuous part knuckle radius; R
52Be short plug 5 sizing area bight radiuss of corner.
7) B, H are expressed as the wide, high of rectangular tube among the present invention.
The specific embodiment
The present invention is further described as follows below in conjunction with drawings and Examples:
Embodiment
Present embodiment is 1: 2.0 with high H and wide B ratio, dimensions 90.12mm * 45.16mm * 2.06mm, and the aluminium-alloy pipe of inside surface roughness Ra1.0 is an example, has proposed a kind of forming process of making this type of model rectangular tube, concrete implementation step is as follows:
A) trade mark that will prepare is that 6061 the equal fire of aluminium alloy cast ingot is heated to 415 ± 5 ℃, and lasting 1-2h.The all fiery purpose of handling of ingot casting is to eliminate the residual stress of the inner formation in metal founding end back, improves the plastic working ability of cast metals, improves the institutional framework and the mechanical property of product, for follow-up further processing is got ready.In actual production, most of aluminium alloy cast ingots all will carry out necessary equal fire before carrying out pressure processing handles.
B) at first the Extrusion Porthole Die for Aluminium Profiles tool is carried out The pre-heat treatment to 400 ℃, be the recipient that 450 ℃ of aluminium alloy cast ingots are put into mould then with heating-up temperature, promoting the extruding rod by equipment compresses ingot casting, force metal to be split into the three beams metal flow by the tap hole on the mould, then metal flow carries out the high temperature seam in that the seam of recipient front end is indoor, and finally push away the woolen cloth pipe that formation has certain size and shape by the gap between nib wall and the plug.The advantage of this method is obviously to have reduced shaping load, has improved the life-span of mould, and the most important thing is that therefore prepared woollen pipe evenness of wall thickness degree is higher owing to axiality cooperation preferably between mould plug, recipient, the extruding rod three.
C) the woollen pipe of step b) gained is carried out 500 ℃, the liquid annealing of insulation 30min is handled.Its purpose mainly contains two: 1. guarantee fully carrying out of crystallization again, with crystal grain thinning, improve the intensity of pipe.2. isolate pipe and air, prevent the appearance of oxide skin, improve surface quality.
D) the woollen pipe of step c) gained is carried out cold roll forming, temperature is a room temperature, obtains the circular pipe blank that dimensions is Ф 92.6 * 2.16mm.Cold rolling main purpose is to improve the dimensional accuracy and the surface smoothness of hot extrusion pipe, obtains superior in quality initial circular pipe blank.
E) circular pipe blank after rolling is put into the 38# steam cylinder oil and soaked 24 hours, make the pipe surface form good oil lamella,, reduce friction to improve the lubricating status of following process.
F) use transition drawing die 1 empty stretched circular pipe base to obtain approximate rectangular pipe.This mould is by approach cone 1-1, Drawing cone 1-2, and sizing area 1-3 and go out prostomum 1-4 four parts and form, each links to each other between the part with fillet (R
11, R
12, R
13, R
14) seamlessly transit, as Fig. 1, Fig. 2 indicates, and the 1-1 that wherein enters the mouth is a sub-circular, and outlet 1-4 is approximate rectangular, and the long limit of mould correspondence is gone into modular angle degree K
1Be 11 °, minor face L
1It is 3 °.The drawing temperature is a room temperature, and drawing speed is elected 750mm/min as, belongs to drawing at a slow speed.
G) using rectangle to correct mould 2 cooperates plug 3 stretchings to obtain rectangular tube.Wherein mould is by approach cone 2-1, Drawing cone 2-2, and sizing area 2-3 and go out prostomum 2-4 four parts and form, each links to each other between the part with fillet (R
21, R
22, R
23, R
24) seamlessly transit, as Fig. 3, Fig. 4 indicates, and the 2-1 that wherein enters the mouth is rectangle with outlet 2-4, and the long limit of mould correspondence is gone into modular angle degree K
2Be 2.5 °, minor face L
2It is 1.5 °.Similarly, long straight plug 3 is also by approach cone 3-1., and sizing area 3-2 goes out prostomum 3-3 three parts and forms, each part fillet (R that links to each other
3) seamlessly transit, as Fig. 5, shown in Figure 6.The drawing temperature is a room temperature, and drawing speed is elected as, and 750mm/min belongs to drawing at a slow speed.
H) use end product drawing mould 4 to cooperate core print 5 to stretch step h) and obtain production tube.Wherein mould is by approach cone 4-1, Drawing cone 4-2, and sizing area 4-3 and go out prostomum 4-4 four parts and form, each links to each other between the part with fillet (R
41, R
42, R
43, R
44) seamlessly transit, as Fig. 7, Fig. 8 indicates, and the 4-1 that wherein enters the mouth is rectangle with outlet 4-4, and the long limit of mould correspondence is gone into modular angle degree K
3Be 9 °, minor face L
3It is 9 °.What deserves to be explained is that wherein four of drawing mould bights are designed to structure shown in the solid line among Fig. 9 (dotted line is for improving front profile) in this passage.Its design principle can be described below: square-section tubing drawing forming is different from common pipe class, the mobile suffered resistance of four corners position metal particle is bigger, limit portion is then less relatively, certainly will make the same cross section of pipe metal deformation complexity there are differences like this, cause that the pipe distortion is inhomogeneous, and then influence end product quality.Among the present invention, under the prerequisite that does not influence the finished product exterior contour, die corner is done the processing that extends out of suitable degree, to reduce pipe bight metal flow resistance, the complexity of the same cross section of balance flow of metal everywhere is to improve the uniformity and the uniformity of pipe distortion.Similarly, core print 5 is by approach cone 5-1., and sizing area 5-2 goes out prostomum 5-3 three parts and forms, each part fillet (R that links to each other
51) seamlessly transit R
52Then be used for guaranteeing production tube filleted corner size, as Figure 10, shown in Figure 11.The drawing temperature is a room temperature, and drawing speed is elected 750mm/min as, belongs to drawing at a slow speed.
In order to make circular pipe blank reasonably be configured as final rectangular tube, to be divided into be three passages to drawing process among the present invention, be followed successively by the stage die sky and draw the approximate rectangular pipe of acquisition, rectangle is corrected mould cored bar drawing acquisition rectangular tube and the drawing of finishing die belt carcass head makes the final finished pipe.The purpose that the transition sky draws is to be approximate rectangular with the transition of initial circular section, and this passage has been born most metal strains, has reduced the severe degree of subsequent technique pipe distortion.The purpose that rectangle is corrected is that the approximate rectangular pipe that passage one makes is carried out shape correction one time, make it more approach net shape, and this passage employing plug draw, the inner surface quality that pipe is good guaranteed, simultaneously wall thickness is kept to 2.10mm, plays the effect of forming a connecting link preferably.The drawing of finished product cored bar then is in order to obtain shape, size, and the rectangular tube that surface quality is all qualified also is a steps necessary the most key in three passages.
Present embodiment shows, the manufacturing process of high-accuracy aluminum alloy rectangular tube involved in the present invention can improve the dimensional accuracy and the surface quality of finished product tubing effectively, having solved in the drawing process pipe breaks, the problem of obvious transversal crack appears in the bight, and the serviceability of product and life-span are greatly enhanced.Simultaneously, the development that also can be other specification rectangular tubes of this method provides stronger reference.
Claims (1)
1. high-accuracy aluminum alloy rectangular tube manufacturing process is characterized in that step is as follows:
A) trade mark that will prepare is that 6061 the equal fire of aluminium alloy cast ingot is heated to 415 ± 5 ℃, and keeps 1-2hr;
B) step a) gained ingot casting being heated to 450 ℃, is that hot extrusion makes initial woollen pipe on 400 ℃ the Extrusion Porthole Die for Aluminium Profiles tool in preheat temperature then;
C) the woollen pipe of step b) gained being carried out temperature is that 500 ℃, the liquid annealing of insulation 30min are handled;
D) pipe that is Ф 92.6 * 2.16mm with the cold rolling one-tenth dimensions of the woollen pipe of step c) gained;
E) step d) gained circular pipe blank is put into the 38# steam cylinder oil and soak 24hr;
F) be approximate rectangular pipe with the empty drawing of step e) gained pipe;
G) the approximate rectangular pipe of step f) gained being corrected the drawing of mould cored bar by rectangle is rectangular tube;
H) be that dimensions is the production tube of 90.12 * 45.16 * 2.06mm with the drawing of step g) gained rectangular tube cored bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110000927 CN102172665B (en) | 2011-01-04 | 2011-01-04 | High-precision aluminum alloy rectangular tube forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110000927 CN102172665B (en) | 2011-01-04 | 2011-01-04 | High-precision aluminum alloy rectangular tube forming method |
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| Publication Number | Publication Date |
|---|---|
| CN102172665A true CN102172665A (en) | 2011-09-07 |
| CN102172665B CN102172665B (en) | 2013-04-03 |
Family
ID=44516015
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110000927 Expired - Fee Related CN102172665B (en) | 2011-01-04 | 2011-01-04 | High-precision aluminum alloy rectangular tube forming method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357628A (en) * | 2011-10-13 | 2012-02-22 | 北京机电研究所 | Method for forming aluminum alloy branch forgings |
| CN102764791A (en) * | 2012-07-31 | 2012-11-07 | 广东和胜工业铝材股份有限公司 | Method for manufacturing non-heat-treatable enhanced aluminum alloy rectangular tube |
| CN102777763A (en) * | 2012-07-31 | 2012-11-14 | 广东和胜工业铝材股份有限公司 | Non-heat-treatable strengthened aluminum alloy rectangular pipe blank applicable to forming rectangular pipe through drawing |
| CN102974646A (en) * | 2012-12-20 | 2013-03-20 | 西南铝业（集团）有限责任公司 | Manufacturing process of aluminum alloy water-drop-shaped thin-wall tubular material |
| CN104409157A (en) * | 2014-11-28 | 2015-03-11 | 济南宝世达实业发展有限公司 | Electromagnetic wire and processing method thereof |
| CN104438428A (en) * | 2014-09-11 | 2015-03-25 | 西北有色金属研究院 | Manufacturing method of small-specification TA16 titanium alloy thick-wall pipe |
| CN104607475A (en) * | 2015-01-24 | 2015-05-13 | 重庆西重特种铝业有限公司 | Machining process of aluminum alloy rectangular pipe |
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| CN107737816A (en) * | 2017-12-02 | 2018-02-27 | 山东新纪元特钢有限公司 | A kind of right angle square tube |
| CN109860946A (en) * | 2019-01-10 | 2019-06-07 | 金龙精密铜管集团股份有限公司 | A kind of rectangular header and its processing method |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357628A (en) * | 2011-10-13 | 2012-02-22 | 北京机电研究所 | Method for forming aluminum alloy branch forgings |
| CN102764791B (en) * | 2012-07-31 | 2015-09-30 | 广东和胜工业铝材股份有限公司 | The manufacture method of not heat-treatable strengthened aluminum rectangular tube |
| CN102764791A (en) * | 2012-07-31 | 2012-11-07 | 广东和胜工业铝材股份有限公司 | Method for manufacturing non-heat-treatable enhanced aluminum alloy rectangular tube |
| CN102777763A (en) * | 2012-07-31 | 2012-11-14 | 广东和胜工业铝材股份有限公司 | Non-heat-treatable strengthened aluminum alloy rectangular pipe blank applicable to forming rectangular pipe through drawing |
| CN102777763B (en) * | 2012-07-31 | 2014-04-23 | 广东和胜工业铝材股份有限公司 | Non-heat-treatable strengthened aluminum alloy rectangular pipe blank applicable to forming rectangular pipe through drawing |
| CN102974646A (en) * | 2012-12-20 | 2013-03-20 | 西南铝业（集团）有限责任公司 | Manufacturing process of aluminum alloy water-drop-shaped thin-wall tubular material |
| CN104438428A (en) * | 2014-09-11 | 2015-03-25 | 西北有色金属研究院 | Manufacturing method of small-specification TA16 titanium alloy thick-wall pipe |
| CN104409157A (en) * | 2014-11-28 | 2015-03-11 | 济南宝世达实业发展有限公司 | Electromagnetic wire and processing method thereof |
| CN104607475A (en) * | 2015-01-24 | 2015-05-13 | 重庆西重特种铝业有限公司 | Machining process of aluminum alloy rectangular pipe |
| CN104858259A (en) * | 2015-05-08 | 2015-08-26 | 福建省闽发铝业股份有限公司 | Forming technology of aluminum alloy thin-walled pipe |
| CN107710525A (en) * | 2015-12-31 | 2018-02-16 | 深圳市大富方圆成型技术有限公司 | A kind of apparatus and method for manufacturing flat metal tube |
| CN107710525B (en) * | 2015-12-31 | 2019-06-21 | 深圳市大富方圆成型技术有限公司 | A kind of device and method manufacturing flat metal tube |
| CN105458031A (en) * | 2016-01-08 | 2016-04-06 | 河北新中联特种钢管股份有限公司 | Flexible forming method of secondary forming square tube |
| CN107201487A (en) * | 2016-03-17 | 2017-09-26 | 福特全球技术公司 | Highly strain the restoring heat treatment of part |
| CN107737816A (en) * | 2017-12-02 | 2018-02-27 | 山东新纪元特钢有限公司 | A kind of right angle square tube |
| CN109860946A (en) * | 2019-01-10 | 2019-06-07 | 金龙精密铜管集团股份有限公司 | A kind of rectangular header and its processing method |
| CN113096932A (en) * | 2021-04-02 | 2021-07-09 | 沈阳宏远电磁线股份有限公司 | Self-cooling hollow electromagnetic wire and preparation method thereof |
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