CN102764791B - The manufacture method of not heat-treatable strengthened aluminum rectangular tube - Google Patents
The manufacture method of not heat-treatable strengthened aluminum rectangular tube Download PDFInfo
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- CN102764791B CN102764791B CN201210271475.5A CN201210271475A CN102764791B CN 102764791 B CN102764791 B CN 102764791B CN 201210271475 A CN201210271475 A CN 201210271475A CN 102764791 B CN102764791 B CN 102764791B
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Abstract
The present invention relates to metal working technical area, particularly relate to the manufacture method of not heat-treatable strengthened aluminum rectangular tube.First Section Design is carried out to initial pipe, designing initial pipe cross section is rectangle, this rectangular cross section comprises four drift angles, four stage casings, limit and connects the changeover portion in place drift angle and Ge Bian stage casing, place, thickness is identical everywhere on four stage casing, limits, rectangular cross section is minimum in each drift angle place thickness, in stage casing, each limit, thickness is maximum, and each drift angle connects its contiguous stage casing, each limit by the changeover portion of progressive additive; Again aluminum alloy materials is carried out to the initial rectangular pipe of hot extrusion molding step a; Finally the initial pipe of step b gained is carried out drawing and form finished product rectangular tube.The method flow process is simple, with low cost, lumber recovery and dimensional accuracy high, be convenient to large-scale production.
Description
Technical field:
The present invention relates to metal working technical area, particularly relate to the manufacture method of the large cross section thin-walled rectangular tube of a kind of not heat-treatable strengthened aluminum alloy high accuracy.
Background technology:
Energy-saving and emission-reduction, reduction crude oil consumption are the developing goals of new-energy automobile.Compared with traditional power automobile, hybrid power and pure electric automobile have better effects of energy conservation and environmental protection, are therefore more and more subject to the favor in market.As the power core parts of hybrid power and pure power vehicle, the application of battery is day by day extensive, and as the pith of battery, the dimensional accuracy that battery case requires, thermal diffusivity, corrosion resistance and ability of anti-deformation also improve constantly.
Large cross section thin-walled rust-preventing aluminum alloy, because of good characteristics such as its light weight, thermal conductivity are good, day by day becomes the important source material that battery case makes.
But because this type of big cross section thin-walled rust-preventing aluminum alloy intensity is low and not heat-treatable strengthened, only have and improve intensity by cold worked form.In current actual production, prepare this type of rectangle pipe material and mainly adopt: the forming arrangements 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 forming arrangements technique have long flow path, cost high, be difficult to the defect that realizes producing in enormous quantities.In addition, pipe shaping in this flow process material deformation when drawing is unreasonable, uniformity and the uniformity of metal Particles flow are poor, often occur Problems in formings such as breaking, bight formation transversal crack, dimension overproof, wall unevenness and inside surface roughness are not up to standard in process.
Summary of the invention:
The object of this invention is to provide the manufacture method of not heat-treatable strengthened aluminum rectangular tube, its flow process be simple, with low cost, lumber recovery and dimensional accuracy high, be convenient to large-scale production.
The technical scheme of the manufacture method of not heat-treatable strengthened aluminum rectangular tube of the present invention is achieved in that
Can not the manufacture method of heat-treatable aluminum alloy rectangular tube, comprise the following steps:
A. Section Design is carried out to initial pipe, designing initial pipe cross section is rectangle, this rectangular cross section comprises four drift angles, four stage casings, limit and is positioned at the changeover portion in each limit connection place drift angle and stage casing, limit, place, thickness is identical everywhere on four stage casing, limits, rectangular cross section is minimum in each drift angle place thickness, in stage casing, each limit, thickness is maximum, and each drift angle connects its contiguous stage casing, each limit by the changeover portion of progressive additive;
B. aluminum alloy materials is carried out to the initial rectangular pipe of hot extrusion molding step a;
C. the initial pipe of step b gained is carried out drawing and form finished product rectangular tube.
The manufacture method of not heat-treatable strengthened aluminum rectangular tube of the present invention compared with prior art tool has the following advantages:
1. pair initial pipe carries out cross section design, makes the pipe of hot extrusion molding be rectangle.Because of initial pipe and the finished product rectangular tube shape approximation of design, during drawing, material deformation is in less scope, and Particles flow is more even everywhere to make the pipe of hot extrusion molding, and thickness is more consistent, improves dimensional accuracy and the lumber recovery of finished product rectangular tube;
2. passing through the initial pipe of design is rectangle, shortens work flow, and pipe can shaping finished product rectangular tube after a time drawing.Reduce production cost, improve production efficiency, make this manufacture method more easily by universal use;
3. in rectangle pipe drawing process, due to the squeezing action of external mold and core print, cause rectangle pipe cross section pressure everywhere different, wherein, suffered by the metal Particles flow of rectangle pipe cross section four drift angles, resistance is greater than four stage casings, limit, therefore design pipe rectangular cross section drift angle thickness is minimum, four drift angles connect contiguous stage casing, each limit through the changeover portion of progressive additive, reducing the resistance of bight and changeover portion metal fulcrum when being squeezed, improve dimensional accuracy and the lumber recovery of cost tubing.
The aluminum alloy materials of step b described above is aluminium alloy cast ingot, before step b hot extrusion, first carry out homogeneous process to aluminium alloy cast ingot.The object of ingot casting homogeneous process is to eliminate the residual stress that metal casting terminates the formation of rear inside, improves the plastic working ability of cast metals, improves institutional framework and the mechanical property of product, for follow-up further processing is ready.
The thickness at pipe rectangular cross section described above each drift angle place is identical with finished product rectangular tube thickness, and on changeover portion, each sectional shrinkage is identical with four stage casing, limit shrinkage factors.This design improves the uniformity of pipe metal Particles flow, improves dimensional accuracy and lumber recovery further.
The changeover portion at place, the long limit of each rectangle described above and the intersection, stage casing at place form First Transition point, and each changeover portion at rectangle minor face place and the intersection, stage casing at place form the second transition point;
Pipe rectangular cross-sectional face length limit is 107.5mm, minor face is 31.9mm, four stage casing, limit 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 described long limit of each rectangle described above and the intersection, stage casing at place form First Transition point, and each changeover portion at rectangle minor face place and the intersection, stage casing at place form the second transition point;
The long limit of pipe rectangular cross section rectangle is 151.7mm, minor face is 59.3mm, four stage casing, limit 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 product rectangle pipe range limit is 146.8mm, and minor face is 57.2mm, and each limit and drift angle thickness are 1.4mm.
Accompanying drawing illustrates:
Below in conjunction with accompanying drawing, the present invention is described in detail:
Fig. 1 is the initial pipe cross sectional representation of the present invention;
Fig. 2 is finished product rectangular tube cross sectional representation of the present invention;
Fig. 3 is initial rectangular pipe design principle schematic diagram of the present invention;
Fig. 4 is bight and the changeover portion enlarged diagram of Fig. 3;
Fig. 5 is the diffluence combination die structural representation used in step c in the specific embodiment of the invention;
Fig. 6 be in the specific embodiment of the invention in steps d use the structural representation of end product drawing external mold;
Fig. 7 is the structural representation coordinating end product drawing external mold core print used in the specific embodiment of the invention in steps d.
Detailed description of the invention:
As shown in Figures 1 to 7, the manufacture method of not heat-treatable strengthened aluminum rectangular tube is it provided: idiographic flow is as follows:
A. the initial pipe that cross section is rectangle is designed, the rectangular cross section of pipe comprises four drift angles 1, four stage casing, limit 2 and connects the changeover portion 3 in drift angle 1 and stage casing, each limit 2, thickness β is identical everywhere on four stage casing, limits 2, rectangular cross section each drift angle thickness alpha is minimum, thickness β is maximum for stage casing, each limit, and each drift angle 1 connects its contiguous stage casing, each limit 2 respectively by the changeover portion 3 of progressive additive.
Described each drift angle thickness alpha is identical with finished product rectangular tube thickness γ, and on changeover portion 3, each sectional shrinkage is identical with four stage casing, limit 2 shrinkage factors.
The changeover portion 3 at place, described each rectangle long limit forms First Transition point 7 with the intersection, stage casing 2 at place, and the changeover portion at each rectangle minor face place and the intersection, stage casing 2 at place form the second transition point 8;
Pipe rectangular cross-sectional face length limit is 107.5mm, minor face is 31.9mm, four stage casing, limit 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 wall, second transition point 8 is 8.25mm apart from the distance of nearest stage casing 2, long limit outer wall, and each drift angle 1 place thickness is 1mm;
Rectangle pipe is when material drawing forming, suffered by four bight metal Particles flows, resistance is maximum, stage casing 2 is then relatively little, for obtaining uniform tubing, design four drift angle 1 place thickness minimum, four drift angles 1 connect corresponding rectangular cross section stage casing 2 through the changeover portion 3 of progressive additive, contribute to reducing bight and changeover portion 3 metal particle resistance, to improve finished product tubing dimensional accuracy and lumber recovery.
B. the casting alloy trade mark is the aluminium alloy cast ingot of 3003, then ingot casting is carried out to the homogeneous process of 9 hours, 620 DEG C.
The object of ingot casting homogeneous process is to eliminate the residual stress that metal casting terminates the formation of rear inside, improves the plastic working ability of cast metals, improves institutional framework and the mechanical property of product, for follow-up further processing is ready.
C. step b gained ingot casting is heated to 460 DEG C, is hot extruded into the initial pipe of step a by the diffluence combination die 6 being preheated to 400 DEG C;
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 seam bottom mould bridge 61, then flowed out by the gap between counterdie 64 and core rod 65.The method is due to axiality cooperation good between mould, recipient, pressure ram three, and the initial rectangular pipe evenness of wall thickness degree obtained is higher, meets design size requirement.
D. be finished product rectangular tube by step c gained initial rectangular pipe by belt carcass for the first time property drawing.Drawing equipment comprises external mold 4 and core print 5.Wherein external mold 4 comprises external mold approach cone 41, external mold Drawing cone 42, external mold sizing area 43 and external mold and goes out prostomum 44, and long and short limit enters modular angle a1, a2 is 12 °; Core print 5 comprises core print approach cone 51, core print sizing area 52 and core print and goes out prostomum 53, and during drawing, the temperature of initial rectangular pipe is room temperature, and draw speed is 12m/min.
Manufactured finished product 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:
In step a, the long limit of pipe rectangular cross section rectangle is 151.7mm, minor face is 59.3mm, four stage casing, limit 2 wall thickness 1.6mm, First Transition point 7 is 37.6mm apart from the distance of nearest minor face stage casing 2 outer wall, second transition point 8 is 15.2mm apart from the distance of nearest stage casing 2, long limit outer wall, and each drift angle 1 place thickness is 1.4mm;
Finished product rectangle pipe range limit manufactured in steps d is 146.8mm, and minor face is 57.2mm, and each limit and drift angle γ thickness are 1.4mm.
According to above-described embodiment, the transversal face length limit of gained finished product rectangular tube, minor face, wall thickness dimension precision can reach ± 0.1mm, ± 0.1mm, ± 0.02mm respectively; Solve the problems such as pipe in drawing process is broken, bight formation transversal crack.Properties of product significantly improve, and reach H14 level.
Be a kind of embodiment provided in conjunction with particular content as mentioned above, can not assert that specific embodiment of the invention is confined to these explanations.Such as: the size of described rectangle pipe, the cast ingot dimension manufacturing finished product rectangular tube, extrusion temperature and cold drawing enter the data that the parameters such as modular angle, drawing speed is not limited in embodiment announcement.All approximate, identical with the inventive method, structure etc., or for making some technology deduction or replace under inventive concept prerequisite, all should protection scope of the present invention be considered as.
Claims (5)
1. can not the manufacture method of heat-treatable aluminum alloy rectangular tube, it is characterized in that: comprise the following steps:
A. Section Design is carried out to initial pipe, designing initial pipe cross section is rectangle, this rectangular cross section comprises four drift angles, four stage casings, limit and is positioned at the changeover portion in each limit connection place drift angle and stage casing, limit, place, thickness is identical everywhere on four stage casing, limits, rectangular cross section is minimum in each drift angle place thickness, in stage casing, each limit, thickness is maximum, and each drift angle connects its contiguous stage casing, each limit by the changeover portion of progressive additive;
B. aluminum alloy materials is carried out to the initial rectangular pipe of hot extrusion molding step a;
C. the initial pipe of step b gained is carried out drawing and form finished product rectangular tube.
2. according to claim 1 can not the manufacture method of heat-treatable aluminum alloy rectangular tube, it is characterized in that: the aluminum alloy materials of step b is aluminium alloy cast ingot, before step b hot extrusion, first carry out homogeneous process to aluminium alloy cast ingot.
3. according to claim 2 can not the manufacture method of heat-treatable aluminum alloy rectangular tube, it is characterized in that: the thickness at described pipe rectangular cross section each drift angle place is identical with finished product rectangular tube thickness, on changeover portion, each sectional shrinkage is identical with four stage casing, limit shrinkage factors.
4. according to one of Claims 2 or 3 Suo Shu can not the manufacture method of heat-treatable aluminum alloy rectangular tube, it is characterized in that: the changeover portion at place, described each rectangle long limit and the intersection, stage casing at place form First Transition point, and each changeover portion at rectangle minor face place and the intersection, stage casing at place form the second transition point;
Pipe rectangular cross-sectional face length limit is 107.5mm, minor face is 31.9mm, four stage casing, limit 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 product rectangle pipe range limit is 102mm, and minor face is 30mm, and each limit and drift angle thickness are 1mm.
5. according to one of Claims 2 or 3 Suo Shu can not the manufacture method of heat-treatable aluminum alloy rectangular tube, it is characterized in that: the changeover portion at place, described each rectangle long limit and the intersection, stage casing at place form First Transition point, and each changeover portion at rectangle minor face place and the intersection, stage casing at place form the second transition point;
The long limit of pipe rectangular cross section rectangle is 151.7mm, minor face is 59.3mm, four stage casing, limit 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 product 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 true CN102764791B (en) | 2015-09-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| EP0405065A3 (en) * | 1989-06-30 | 1991-02-06 | Hoesch Aktiengesellschaft | Method of producing rectangular hollow sections of steel with differential wall thickness |
| 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 |
| CN102172665A (en) * | 2011-01-04 | 2011-09-07 | 重庆大学 | High-precision aluminum alloy rectangular tube forming method |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07155831A (en) * | 1993-11-30 | 1995-06-20 | Nippon Steel Metal Prod Co Ltd | Manufacture of tapered rectangular tube |
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2012
- 2012-07-31 CN CN201210271475.5A patent/CN102764791B/en active Active
Patent Citations (6)
| 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 |
| EP0405065A3 (en) * | 1989-06-30 | 1991-02-06 | Hoesch Aktiengesellschaft | Method of producing rectangular hollow sections of steel with differential wall thickness |
| 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 |
| 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 |
| CN102284547A (en) * | 2011-06-23 | 2011-12-21 | 重庆大学 | Method for processing rectangular aluminum alloy waveguide through multi-pass rolling drawing |
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