CN102764791A - Method for manufacturing non-heat-treatable enhanced aluminum alloy rectangular tube - Google Patents
Method for manufacturing non-heat-treatable enhanced aluminum alloy rectangular tube Download PDFInfo
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- CN102764791A CN102764791A CN2012102714755A CN201210271475A CN102764791A CN 102764791 A CN102764791 A CN 102764791A CN 2012102714755 A CN2012102714755 A CN 2012102714755A CN 201210271475 A CN201210271475 A CN 201210271475A CN 102764791 A CN102764791 A CN 102764791A
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Abstract
The invention relates to the technical field of metal processing, in particular to a method for manufacturing a non-heat-treatable enhanced aluminum alloy rectangular tube. The method includes that a, design of the section of an initial tube blank is carried out at first, the rectangular cross section of the initial tube blank is designed and comprises four vertex angles, four side middle sections and transitional sections, each vertex angle is connected with the corresponding side middle sections by the corresponding transitional sections, thicknesses of various positions of the four side middle sections are identical, the vertex angles of the rectangular section are the thinnest, the various side middle sections are the thickest, and each vertex angle is connected with the corresponding adjacent side middle sections by the corresponding transitional section thickened gradually; b, hot extrusion is performed for an aluminum alloy material to form the initial rectangular tube blank designed in the step a; and c, the initial tube blank obtained in the step b is drawn to form the finished rectangular tube. The method is simple in process, low in cost and high in yield and dimensional accuracy and facilitates large-scale production.
Description
Technical field:
The present invention relates to the metalworking technology field, relate in particular to the manufacturing approach of the big cross section thin-walled rectangular tube of a kind of not heat-treatable strengthened aluminium alloy high accuracy.
Background technology:
Energy-saving and emission-reduction, reduction crude oil consumption are the developing goals of new-energy automobile.Compare with the traditional power automobile, hybrid power and pure electric automobile have better effects of energy conservation and environmental protection, therefore more and more receive the favor in market.As the power core component of hybrid power and pure power vehicle, the application of battery is day by day extensive, and as the pith of battery, dimensional accuracy, thermal diffusivity, corrosion resistance and ability of anti-deformation that battery case requires also improve constantly.
Big cross section thin-walled rust-preventing aluminum alloy day by day becomes the important source material of battery case making because of good characteristics such as its light weight, thermal conductivity are good.
But, have only through cold worked form and improve intensity because this type of big section thin-wall rust-preventing aluminum alloy intensity is low and not heat-treatable strengthened.In actual production at present, prepare this type of rectangle tubing and mainly adopt: the shaping scheme of the drawing of the hot-pressed initial circular pipe blank of diffluence combination die, multi-pass drawing preform transition elliptical tube, finished product rectangular tube.But this shaping scheme technology have long flow path, cost high, be difficult to realize the defective produced in enormous quantities.In addition; The pipe of moulding material deformation when drawing is unreasonable in this flow process; Uniformity and uniformity that the metal particle flows are relatively poor, the shaping problem such as tend to occur breaking, bight formation transversal crack, dimension overproof, wall unevenness and inside surface roughness are not up to standard in the process.
Summary of the invention:
The purpose of this invention is to provide the not manufacturing approach of heat-treatable strengthened aluminum rectangular tube, its flow process is simple, with low cost, lumber recovery and dimensional accuracy high, be convenient to large-scale production.
The technical scheme of the manufacturing approach of not heat-treatable strengthened aluminum rectangular tube of the present invention is achieved in that
Manufacturing approach that can not the heat-treatable aluminum alloy rectangular tube may further comprise the steps:
A. initial pipe is carried out Section Design; Designing initial pipe cross section is rectangle; The changeover portion that this rectangular cross section comprises four drift angles, stage casing, four limits and is positioned at each limit connection place drift angle and stage casing, limit, place, thickness is identical everywhere for stage casing, four limits, and rectangular cross section is minimum in each drift angle place thickness; Maximum in each stage casing, limit thickness, each drift angle connects its each contiguous stage casing, limit through the changeover portion of progressive additive;
B. aluminum alloy materials is carried out the initial rectangular pipe of hot extrusion molding step a;
C. the initial pipe with step b gained carries out drawing formation finished product rectangular tube.
The manufacturing approach of not heat-treatable strengthened aluminum rectangular tube of the present invention compared with prior art has following advantage:
1. initial pipe is carried out the cross section design, the pipe that makes hot extrusion molding is a rectangle.Because of initial pipe and the finished product rectangular tube shape of design are approximate, during drawing material deformation in small range, make hot extrusion molding pipe everywhere particle flow more evenly, thickness is unanimity more, has improved the dimensional accuracy and the lumber recovery of finished product rectangular tube;
2. be rectangle through the initial pipe of design, shortened work flow, pipe can the shaping finished product rectangular tube after a time drawing.Reduced production cost, improved production efficiency, made this manufacturing approach popularized more easily and use;
3. in the rectangle pipe drawing process; Because the squeezing action of external mold and core print; Cause rectangle pipe cross section pressure everywhere different, wherein, the metal particle of four drift angles of rectangle pipe cross section flows suffered resistance greater than stage casing, four limits; So design pipe rectangular cross section drift angle thickness is minimum; The changeover portion of four drift angle process progressive additives connects each contiguous stage casing, limit, has reduced the resistance of bight and changeover portion metal fulcrum when being squeezed, and has improved the dimensional accuracy and the lumber recovery of cost tubing.
The aluminum alloy materials of above-mentioned said step b is an aluminium alloy cast ingot, before step b hot extrusion, earlier aluminium alloy cast ingot is spared matter and handles.The purpose of ingot casting homogenization processing is to eliminate the inner residual stress that forms 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.
The thickness at each drift angle place of above-mentioned said pipe rectangular cross section is identical with finished product rectangular tube thickness, and each sectional shrinkage is identical with stage casing, four limits shrinkage factor on the changeover portion.This design has improved the uniformity that pipe metal particle flows, and further improves dimensional accuracy and lumber recovery.
The changeover portion at place, the long limit of above-mentioned said each rectangle and the intersection, stage casing at place form first transition point, and the changeover portion at each rectangle minor face place and the intersection, stage casing at place form second transition point;
Pipe rectangular cross-sectional face length limit is 107.5mm; Minor face is 31.9mm, stage casing, four limits wall thickness 1.25mm, and first transition point is 26.25mm apart from the distance of nearest minor face stage casing outer wall; Second transition point is 8.25mm apart from the distance of nearest stage casing, long limit outer wall, and each drift angle place thickness is 1mm;
The changeover portion at place, the long limit of above-mentioned said each rectangle and the intersection, stage casing at place form first transition point, and the changeover portion at each rectangle minor face place and the intersection, stage casing at place form second transition point;
The long limit of pipe rectangular cross section rectangle is 151.7mm; Minor face is 59.3mm, stage casing, four limits wall thickness 1.6mm, and first transition point is 37.6mm apart from the distance of nearest minor face stage casing outer wall; Second transition point is 15.2mm apart from the distance of nearest stage casing, long limit outer wall, and each drift angle place thickness is 1.4mm;
Manufactured finished rectangle pipe range limit is 146.8mm, and minor face is 57.2mm, and each limit and drift angle thickness are 1.4mm.
Description of drawings:
Below in conjunction with accompanying drawing the present invention is done detailed explanation:
Fig. 1 is the initial pipe cross sectional representation of the present invention;
Fig. 2 is a finished product rectangular tube cross sectional representation of the present invention;
Fig. 3 is an initial rectangular pipe design principle sketch map of the present invention;
Fig. 4 is bight and the changeover portion enlarged diagram of Fig. 3;
Fig. 5 is an employed diffluence combination die structural representation among the step c in the specific embodiment of the invention;
Fig. 6 is the structural representation that uses the end product drawing external mold in the specific embodiment of the invention in the steps d;
Fig. 7 is the structural representation that cooperates the used core print of end product drawing external mold in the specific embodiment of the invention in the steps d.
The specific embodiment:
To shown in Figure 7, it provides the not manufacturing approach of heat-treatable strengthened aluminum rectangular tube: idiographic flow is following like Fig. 1:
A. designing cross section is the initial pipe of rectangle; The rectangular cross section of pipe comprises four drift angles 1, stage casing, four limits 2 and the changeover portion 3 that connects drift angle 1 and each stage casing, limit 2; Thickness β is identical everywhere in stage casing, four limits 2; Each drift angle thickness alpha of rectangular cross section is minimum, and each stage casing, limit thickness β is maximum, and each drift angle 1 connects its each contiguous stage casing, limit 2 respectively through the changeover portion 3 of progressive additive.
Said each drift angle thickness alpha is identical with finished product rectangular tube thickness γ, and each sectional shrinkage is identical with stage casing, four limits 2 shrinkage factors on the changeover portion 3.
The changeover portion 3 at place, the long limit of said each rectangle forms first transition point 7 with 2 intersections, stage casing at place, and the changeover portion at each rectangle minor face place and 2 intersections, stage casing at place form second transition point 8;
Pipe rectangular cross-sectional face length limit is 107.5mm; Minor face is 31.9mm, stage casing, four limits 2 wall thickness 1.25mm, and first transition point 7 is 26.25mm apart from the distance of nearest minor face stage casing 2 outer walls; Second transition point 8 is 8.25mm apart from the distance of nearest stage casing, long limit 2 outer walls, and each drift angle 1 place's thickness is 1mm;
The rectangle pipe is when the material drawing forming; Four mobile suffered resistances of bight metal particles are maximum, and stage casing 2 is then less relatively, for obtaining uniform tubing; It is minimum to design four drift angles, 1 place's thickness; Four drift angles 1 connect corresponding rectangular cross section stage casing 2 through the changeover portion 3 of progressive additive, help to reduce bight and changeover portion 3 metal particle resistances, to improve finished product tubing dimensional accuracy and lumber recovery.
B. the casting alloy trade mark is 3003 aluminium alloy cast ingot, then ingot casting is carried out 9 hours, 620 ℃ homogenization processing.
The purpose of ingot casting homogenization processing is to eliminate the inner residual stress that forms 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.
C. step b gained ingot casting is heated to 460 ℃, is hot extruded into the initial pipe of step a through the diffluence combination die 6 that is preheated to 400 ℃;
Diffluence combination die 6 comprises mould bridge 61, die cavity 62, patrix 63, counterdie 64 and core rod 65.During hot extrusion, ingot casting is divided into four strands of metal flow loading mould cavities by mould bridge 61, and in the 61 bottom seam of mould bridge, flows out through the gap between counterdie 64 and the core rod 65 again.This method is owing to axiality cooperation preferably between mould, recipient, the pressure ram three, and the initial rectangular pipe evenness of wall thickness degree that obtains is higher, meets the design size requirement.
D. be the finished product rectangular tube with step c gained initial rectangular pipe through belt carcass property drawing for the first time.Drawing equipment comprises external mold 4 and core print 5.Wherein external mold 4 comprises that external mold approach cone 41, external mold Drawing cone 42, external mold sizing area 43 and external mold go out prostomum 44, and modular angle a1 is gone on long and short limit, a2 is 12 °; Core print 5 comprises that core print approach cone 51, core print sizing area 52 and core print go out prostomum 53, and the temperature of initial rectangular pipe is a room temperature during drawing, and draw speed is 12m/min.
Manufactured finished rectangle pipe range limit is 102mm, and minor face is 30mm, and each limit and drift angle thickness γ are 1mm.
Another preferred version as this pipe embodiment:
The long limit of pipe rectangular cross section rectangle is 151.7mm among the step a; Minor face is 59.3mm; Stage casing, four limits 2 wall thickness 1.6mm; First transition point 7 is 37.6mm apart from the distance of nearest minor face stage casing 2 outer walls, and second transition point 8 is 15.2mm apart from the distance of nearest stage casing, long limit 2 outer walls, and each drift angle 1 place's thickness is 1.4mm;
Manufactured finished rectangle pipe range limit is 146.8mm in the steps d, and minor face is 57.2mm, and each limit and drift angle γ thickness are 1.4mm.
According to the foregoing description, the transversal face length of gained finished product rectangular tube limit, minor face, wall thickness dimension precision can reach respectively ± 0.1mm, ± 0.1mm, ± 0.02mm; Solved in the drawing process that pipe is broken, the bight forms problems such as transversal crack.Properties of product significantly improve, and reach the H14 level.
Be a kind of embodiment that combines particular content to provide as stated, can not assert that practical implementation of the present invention is confined to these explanations.For example: ingot casting size, extrusion temperature and the cold drawing of the size of said rectangle pipe, manufacturing finished product rectangular tube are gone into parameters such as modular angle, drawing speed and are not limited in the data that embodiment announces.All approximate, identical with the inventive method, structure etc., or, all should be regarded as protection scope of the present invention for making some technological deduction or replace under the inventive concept prerequisite.
Claims (5)
1. manufacturing approach that can not the heat-treatable aluminum alloy rectangular tube is characterized in that: may further comprise the steps:
A. initial pipe is carried out Section Design; Designing initial pipe cross section is rectangle; The changeover portion that this rectangular cross section comprises four drift angles, stage casing, four limits and is positioned at each limit connection place drift angle and stage casing, limit, place, thickness is identical everywhere for stage casing, four limits, and rectangular cross section is minimum in each drift angle place thickness; Maximum in each stage casing, limit thickness, each drift angle connects its each contiguous stage casing, limit through the changeover portion of progressive additive;
B. aluminum alloy materials is carried out the initial rectangular pipe of hot extrusion molding step a;
C. the initial pipe with step b gained carries out drawing formation finished product rectangular tube.
2. manufacturing approach that can not the heat-treatable aluminum alloy rectangular tube according to claim 1, it is characterized in that: the aluminum alloy materials of step b is an aluminium alloy cast ingot, before step b hot extrusion, earlier aluminium alloy cast ingot spare the matter processing.
3. manufacturing approach that can not the heat-treatable aluminum alloy rectangular tube according to claim 2; It is characterized in that: the thickness at each drift angle place of said pipe rectangular cross section is identical with finished product rectangular tube thickness, and each sectional shrinkage is identical with stage casing, four limits shrinkage factor on the changeover portion.
4. according to the described manufacturing approach that can not the heat-treatable aluminum alloy rectangular tube in one of claim 2 or 3; It is characterized in that: the changeover portion at place, the long limit of said each rectangle and the intersection, stage casing at place form first transition point, and the changeover portion at each rectangle minor face place and the intersection, stage casing at place form second transition point;
Pipe rectangular cross-sectional face length limit is 107.5mm; Minor face is 31.9mm, stage casing, four limits wall thickness 1.25mm, and first transition point is 26.25mm apart from the distance of nearest minor face stage casing outer wall; Second transition point is 8.25mm apart from the distance of nearest stage casing, long limit outer wall, and each drift angle place thickness is 1mm;
Manufactured finished rectangle pipe range limit is 102mm, and minor face is 30mm, and each limit and drift angle thickness are 1mm.
5. according to the described manufacturing approach that can not the heat-treatable aluminum alloy rectangular tube in one of claim 2 or 3; It is characterized in that: the changeover portion at place, the long limit of said each rectangle and the intersection, stage casing at place form first transition point, and the changeover portion at each rectangle minor face place and the intersection, stage casing at place form second transition point;
The long limit of pipe rectangular cross section rectangle is 151.7mm; Minor face is 59.3mm, stage casing, four limits wall thickness 1.6mm, and first transition point is 37.6mm apart from the distance of nearest minor face stage casing outer wall; Second transition point is 15.2mm apart from the distance of nearest stage casing, long limit outer wall, and each drift angle place thickness is 1.4mm;
Manufactured finished rectangle pipe range limit is 146.8mm, and minor face is 57.2mm, and each limit and drift angle thickness are 1.4mm.
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| CN201210271475.5A CN102764791B (en) | 2012-07-31 | 2012-07-31 | The manufacture method of not heat-treatable strengthened aluminum rectangular tube |
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| CN201210271475.5A CN102764791B (en) | 2012-07-31 | 2012-07-31 | The manufacture method of not heat-treatable strengthened aluminum rectangular tube |
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| CN102764791B CN102764791B (en) | 2015-09-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111496007A (en) * | 2020-04-22 | 2020-08-07 | 广东和胜工业铝材股份有限公司 | Method for producing aluminum alloy pipe |
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| GB778422A (en) * | 1955-01-03 | 1957-07-10 | Stewarts & Lloyds Ltd | Manufacture of steel or other metal tubes |
| EP0405065A2 (en) * | 1989-06-30 | 1991-01-02 | Fried. Krupp AG Hoesch-Krupp | Method of producing rectangular hollow sections of steel with differential wall thickness |
| JPH07155831A (en) * | 1993-11-30 | 1995-06-20 | Nippon Steel Metal Prod Co Ltd | Manufacture of tapered rectangular tube |
| CN102172665A (en) * | 2011-01-04 | 2011-09-07 | 重庆大学 | High-precision aluminum alloy rectangular tube forming method |
| CN201960100U (en) * | 2011-03-17 | 2011-09-07 | 大连大山结晶器有限公司 | Copper pipe of continuous casting square billet crystallizer |
| CN102284547A (en) * | 2011-06-23 | 2011-12-21 | 重庆大学 | Method for processing rectangular aluminum alloy waveguide through multi-pass rolling drawing |
| CN202100928U (en) * | 2011-06-10 | 2012-01-04 | 江苏界达特异新材料股份有限公司 | Seamless tube for front axle of tractor |
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2012
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB778422A (en) * | 1955-01-03 | 1957-07-10 | Stewarts & Lloyds Ltd | Manufacture of steel or other metal tubes |
| EP0405065A2 (en) * | 1989-06-30 | 1991-01-02 | Fried. Krupp AG Hoesch-Krupp | Method of producing rectangular hollow sections of steel with differential wall thickness |
| JPH07155831A (en) * | 1993-11-30 | 1995-06-20 | Nippon Steel Metal Prod Co Ltd | Manufacture of tapered rectangular tube |
| CN102172665A (en) * | 2011-01-04 | 2011-09-07 | 重庆大学 | High-precision aluminum alloy rectangular tube forming method |
| CN201960100U (en) * | 2011-03-17 | 2011-09-07 | 大连大山结晶器有限公司 | Copper pipe of continuous casting square billet crystallizer |
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| CN102284547A (en) * | 2011-06-23 | 2011-12-21 | 重庆大学 | Method for processing rectangular aluminum alloy waveguide through multi-pass rolling drawing |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111496007A (en) * | 2020-04-22 | 2020-08-07 | 广东和胜工业铝材股份有限公司 | Method for producing aluminum alloy pipe |
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| CN102764791B (en) | 2015-09-30 |
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