CN110355256A - Aluminium alloy bicycle frame section tube hydroforming process and its hydroforming die - Google Patents
Aluminium alloy bicycle frame section tube hydroforming process and its hydroforming die Download PDFInfo
- Publication number
- CN110355256A CN110355256A CN201910568136.5A CN201910568136A CN110355256A CN 110355256 A CN110355256 A CN 110355256A CN 201910568136 A CN201910568136 A CN 201910568136A CN 110355256 A CN110355256 A CN 110355256A
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- die
- section
- pipe fitting
- hydroforming
- lower die
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000008569 process Effects 0.000 title claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 21
- 238000007493 shaping process Methods 0.000 claims abstract description 9
- 239000006052 feed supplement Substances 0.000 claims abstract description 7
- 230000007704 transition Effects 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims abstract description 6
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 4
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 239000013589 supplement Substances 0.000 claims description 3
- 239000000047 product Substances 0.000 abstract description 5
- 238000003466 welding Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 101150041295 Segment-9 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/047—Mould construction
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a kind of aluminium alloy bicycle frame section tube hydroforming process and its hydroforming dies, its processing step are as follows: to the filling stage of pipe fitting filling liquid body in hydroforming die, to in pipe fitting while liquid pressing bulging pipe fitting both ends a left side, right horizontal punch according to the loading curve of setting inwardly promotes the shaping stage of feed supplement and improving pressure makes transition region fillet recline completely the truing phase of mold, hydroforming die includes the corresponding upper die and lower die equipped with type chamber, the type chamber of upper die and lower die be able to dock the monolithic devices chamber of the form fit of formation and pipe fitting final molding, lower die and upper mold are embedded connection by concave inward structure and outer male structure, and type chamber is located in outer male structure and concave inward structure, the present invention is able to satisfy robot automatic welding vehicle frame and increases to product supplied materials accuracy requirement and consumer to bicycle product-forming uniqueness High consumption demand.
Description
Technical field
The present invention relates to a kind of technical field of bicycles, particularly relates to a kind of aluminium alloy bicycle frame section tube hydro-forming work
Skill.
Background technique
The following high-end bicycle complexity tube type design, the interior battery type electric assisted bicycle continuous stream of vehicles stream that buries is answered to popularize, meet
Robot automatic welding overlaps the required precision of track consistency to pipe fitting, and common hard mold cold pressing formula moulding pipe has been unable to satisfy machine
Device people's automatic welding precision and consumer is single to product-forming, the simple product-forming demand of structure.Especially begin in recent years
Rising worldwide EBIKE gradually to need to bury battery in pipe fitting in Europe is even more the exaggeration moulding to pipe fitting appearance, inner wall
Precision, which meets Assembly part, high requirement.
The aluminium alloy bicycle frame pipe overwhelming majority is that common hard mold is cold-pressed the simple crest line of formula moulding pipe appearance and modeling, mistake at present
It is fuzzy to cross arc angle, camber line, precision is poor in pipe, and Product Precision and Modeling precision consistency are difficult to ensure between different production batch.
Summary of the invention
In order to overcome drawbacks described above, the present invention provides a kind of aluminium alloy bicycle frame section tube hydroforming process and its production
Method and the molding die used, the aluminium alloy bicycle frame section tube hydroforming process can be realized aluminium alloy bicycle frame shape tube
High-precision modeling.
The present invention is in order to solve technical solution used by its technical problem: a kind of aluminium alloy bicycle frame section tube it is hydraulic at
Type technique, the specific steps are as follows:
The filling stage: it is intracavitary to be put into hydroforming die drag for pipe fitting, (pipe fitting be first Aluminum Alloy Tube is carried out it is hard
Mould is cold-pressed what preforming were formed) press-fitting mould under hydroforming die upper mold, by hydraulic press make it is hydraulically full in tubing (can
Think water or oil), gas is removed side by side, and the both ends of pipe fitting are sealed with left horizontal punch and right horizontal punch respectively；
Shaping stage: by hydraulic press in pipe fitting while liquid pressing bulging, the left and right horizontal punch at pipe fitting both ends
Feed supplement is inwardly promoted according to the loading curve of setting, tubing is made to recline substantially mould under the synergy of internal pressure and axial supplement
Tool, most of region of the moulding pipe other than transition region fillet；
Truing phase: improving pressure makes transition region fillet recline mold completely and is configured to required workpiece.
As a further improvement of the present invention, hydraulic press exports hydraulic pressure according to tube wall thickness and moulding in the shaping stage
Set 30-100MPa；The left and right horizontal punch displacement at pipe fitting both ends is respectively left side cylinder displacement range: 100 ㎜, right side cylinder position
Move range: 100mm；The horizontal punch at hydraulic press output hydraulic pressure 50MPa-150MPa pipe fitting both ends does not have substantially in the truing phase
There is feed supplement.
As a further improvement of the present invention, along straight tube outer end, internally direction sequence is the to the left and right horizontal punch
One section, the second section, third section and Section four, wherein first segment diameter is tube outer diameter -2B, and first segment length is 22mm；Second
Section is the conical section for gradually tapering up first segment and third section connection diameter, and third section diameter is tube outer diameter -2A, and third section is long
Degree is 8mm, and Section four is boot segment that draft inclination angle is 5 °, the big one end diameter of diameter be pipe fitting internal diameter+0.3~+
0.5mm, Section four is connect by the conical section that length is 8mm with third section, and Section of four length is long 14mm's, in which:
When tube wall thickness T≤1.8, A=2/3*T
When tube wall thickness T > 1.8, A=4/5*T
B=A-0.5
A kind of hydroforming die, including upper die and lower die, right above lower die that upper mold can move be positioned at, upper mold and
Corresponding in lower die to be formed with type chamber, the type chamber of upper die and lower die be able to dock the shape of formation Yu pipe fitting final molding
Matched monolithic devices chamber is embedded connection by concave inward structure and outer male structure on the lower die upper side and upper mold downside, and
Type chamber is located in outer male structure and concave inward structure.
As a further improvement of the present invention, the concave inward structure side wall and evagination structure side wall pass through taper face contact.
As a further improvement of the present invention, the outer male structure root is formed with rounded structure, and evagination structure length is gone
Except the straightway of fillet section is 8~12mm.
As a further improvement of the present invention, the insertion gap between the outer male structure and concave inward structure are as follows: hydraulic
0.05mm。
As a further improvement of the present invention, forced area is big in the upper die and lower die one is upper to form outer umbo
Structure, the type chamber formed in upper die and lower die die joint high and low fall at left and right sides of the pipe fitting is that one of 10mm or more is upper formed in
Recessed structure.
As a further improvement of the present invention, angled-lift splits are additionally provided with, the angled-lift splits can be slided along pipe fitting radial direction
Be installed in lower die or upper mold, and angled-lift splits be able to extend into the intracavitary set depth of type, be formed on angled-lift splits along molding
The inclined inclined-plane in direction, upper mold or lower die be equipped with the matched bevel structure of angled-lift splits, the bevel structure be able to be tight against
The inclined-plane of angled-lift splits.
As a further improvement of the present invention, return springs are additionally provided with, the return springs can be mentioned to angled-lift splits
For keeping exiting the elastic holding force in the intracavitary portion of type.
The beneficial effects of the present invention are: the present invention is by using the mating realization aluminium alloy vehicle of hydraulic press and hydroforming die
Frame section tube machine-shaping, by preforming to each cold pressing before Aluminum Alloy Tube hydro-forming parameter, hydro-forming process
The cooperation of design technology parameter and Embedded hydroforming die can carry out perfect aluminium alloy bicycle frame hydro-forming, greatly
Product competitiveness is improved greatly, can satisfy robot automatic welding vehicle frame to product supplied materials accuracy requirement, and reach and preferably sow
Dynamic rate, meets the consumption demand that consumer increasingly increases bicycle product-forming uniqueness.
Detailed description of the invention
Fig. 1 is the state diagram that the present invention is in the filling stage；
Fig. 2 is the state diagram that the present invention is in shaping stage；
Fig. 3 is the state diagram that the present invention is in truing phase；
Fig. 4 is horizontal punch principle schematic diagram of the invention；
Fig. 5 is hydroforming die main view of the invention；
Fig. 6 is sectional view along A-A in Fig. 5；
Fig. 7 is the Slanted slide block mechanism schematic illustration of hydroforming die.
Upper mold --- -1 lower die --- 2 pipe fitting --- 3
Left horizontal punch --- 4 right horizontal punches --- 5 outer male structure --- 6
Concave inward structure --- 7 angled-lift splits --- 8 first segment --- 9
--- --- 11 the 4th sections --- 12 of 10 third sections of second section
Specific embodiment
A kind of embodiment: aluminium alloy bicycle frame section tube hydroforming process, the specific steps are as follows:
The filling stage: it is intracavitary to be put into 2 type of hydroforming die lower die for pipe fitting, and (pipe fitting is first to carry out to Aluminum Alloy Tube
Hard mold is cold-pressed what preforming were formed) the lower press-fitting mould of hydroforming die upper mold 1, made by hydraulic press hydraulically full in tubing
(can be water or oil), removes gas side by side, the both ends of pipe fitting is sealed with left horizontal punch 4 and right horizontal punch 5 respectively；
Shaping stage: by hydraulic press in pipe fitting while liquid pressing bulging, the left and right horizontal punch at pipe fitting both ends
5 inwardly promote feed supplement according to the loading curve of setting, and tubing is made to recline substantially mould under the synergy of internal pressure and axial supplement
Tool, most of region of the moulding pipe other than transition region fillet；
Truing phase: improving pressure makes transition region fillet recline mold completely and is configured to required workpiece.
The processing technology sets special hydro-forming by using dedicated hydroforming die, and according to shaped article
It is preforming etc. before technological parameter, molding procedure, the hydro-forming pipe fitting of high-quality is finally obtained, wherein hydroforming process parameter
Include:
1. the spreading rate of hydro-forming；
The size relation of pressure in 2., external pressure and equilibrant force；
3. horizontal punch movement speed and water swelling time；
4. pipe fitting outer dimension (product is preforming) and tube material；
5. the radius of corner and surface roughness (product-forming) of hydroforming die type chamber；
6. lubricating condition when forming.
Hydraulic press output hydraulic pressure sets 30-100MPa according to tube wall thickness and moulding in the shaping stage；Pipe fitting both ends
Left and right horizontal punch displacement be respectively left side cylinder displacement range: cylinder displacement range on the right side of 100mm: 100 ㎜；The shaping rank
The horizontal punch at hydraulic press output hydraulic pressure 50MPa-150MPa pipe fitting both ends is substantially without feed supplement in section.
Along straight tube outer end, internally direction sequence is first segment, the second section, third section and the to the left and right horizontal punch 5
Four sections, wherein first segment diameter is tube outer diameter -2B, and first segment length is 22mm；Second section is to connect first segment and third section
The conical section that diameter gradually tapers up is connect, third section diameter is tube outer diameter -2A, and third section length is 8mm, and Section four is inclined for draft
The boot segment that angle is 5 °, the big one end diameter of diameter are+0.3~+0.5mm of pipe fitting internal diameter, and Section four is 8mm's by length
Conical section is connect with third section, and Section of four length is long 14mm's, in which:
When tube wall thickness T≤1.8, A=2/3*T
When tube wall thickness T > 1.8, A=4/5*T
B=A-0.5
A kind of hydroforming die, including upper mold 1 and lower die 2, what upper mold 1 can move is positioned at right above lower die 2, on
Corresponding on mould 1 and lower die 2 to be formed with type chamber, the type chamber of upper mold 1 and lower die 2 be able to dock formation and pipe fitting 3 is final
The monolithic devices chamber of molding form fit passes through concave inward structure and outer male structure on 2 upper side of lower die and 1 downside of upper mold
It is embedded connection, and type chamber is located in outer male structure and concave inward structure.Pass through concave inward structure and outer umbo between upper mold 1 and lower die 2
Structure is fitting to connection, and can be prevented die deformation and the opposite sliding of upper mold 1 and lower die 2 in pressure process, be reduced pipe fitting 3 and close
Loft.
The concave inward structure side wall and evagination structure side wall pass through taper face contact.Angle is unified for 3 degree, is conducive to demoulding simultaneously
Prevent mold unedged.
The outer male structure root is formed with rounded structure, evagination structure length remove the straightway of fillet section be 8~
12mm。
Insertion gap between the outer male structure and concave inward structure are as follows: hydraulic
0.05mm。
Forced area is big in the upper mold 1 and lower die 2 one is upper to form outer male structure, is formed in upper mold 1 and lower die 2
Type chamber forms concave inward structure on one that 3 left and right sides die joint high and low fall of pipe fitting is 10mm or more.Divide mould side according to pipe fitting
To the planar design for doing opposite direction, prevent mold from sliding.
Angled-lift splits are additionally provided with, the angled-lift splits can be installed in lower die 2 or upper mold 1 along what 3 radial direction of pipe fitting was slided,
And angled-lift splits be able to extend into the intracavitary set depth of type, be formed on angled-lift splits along molding the inclined inclined-plane in direction, upper mold 1 or
Lower die 2 be equipped with the matched bevel structure of angled-lift splits, the bevel structure be able to be tight against the inclined-plane of angled-lift splits.Pipe fitting is in side
While when having moulding, it is necessary to it is corresponding in die cavity to make moulding cavity, but our pipe fitting placements can only be picked and placed vertically,
So having the problem of pick-and-place interference can not form, it is able to solve pick-and-place interference problem by angled-lift splits, upper mold 1 is utilized after molding
Pressure of laterally taking advantage of a situation extrudes sliding block, completes the hydro-forming of moulding, and die cavity die sinking exits type chamber feeding by angled-lift splits reset.
Return springs are additionally provided with, the return springs can provide the elasticity for keeping exiting the intracavitary portion of type to angled-lift splits
Retentivity, under die cavity die opening state mechanism by return springs by angled-lift splits pull-out type chamber, can smooth pickup.
Claims (10)
1. a kind of aluminium alloy bicycle frame section tube hydroforming process, it is characterised in that: specific step is as follows:
The filling stage: pipe fitting is put into hydroforming die drag is intracavitary, and press-fitting mould under hydroforming die upper mold passes through liquid
Press make it is hydraulically full in tubing, side by side remove gas, left horizontal punch (4) and right horizontal punch are used into the both ends of pipe fitting respectively
(5) it seals；
Shaping stage: by hydraulic press in pipe fitting while liquid pressing bulging, the left and right horizontal punch at pipe fitting both ends according to
The loading curve of setting inwardly promotes feed supplement, and tubing is made to recline substantially mold under the synergy of internal pressure and axial supplement, at
Most of region of the type pipe fitting other than transition region fillet；
Truing phase: improving pressure makes transition region fillet recline mold completely and is configured to required workpiece.
2. aluminium alloy bicycle frame section tube hydroforming process according to claim 1, it is characterised in that: the forming rank
Hydraulic press output hydraulic pressure sets 30-100MPa according to tube wall thickness and moulding in section；The left and right horizontal punch at pipe fitting both ends is displaced
Amount is respectively left side cylinder displacement range: 100 ㎜, right side cylinder displacement range: 100mm；Hydraulic press exports hydraulic pressure in the truing phase
The horizontal punch at 50MPa-150MPa pipe fitting both ends is substantially without feed supplement.
3. aluminium alloy bicycle frame section tube hydroforming process according to claim 1, it is characterised in that: described left and right
Along straight tube outer end, internally direction sequence is first segment, the second section, third section and Section four to horizontal punch, wherein first segment is straight
Diameter is tube outer diameter -2B, and first segment length is 22mm；Second section is the cone for gradually tapering up first segment and third section connection diameter
Shape section, third section diameter are tube outer diameter -2A, and third section length is 8mm, and Section four is boot segment that draft inclination angle is 5 °,
The big one end diameter of diameter is+0.3~+0.5mm of pipe fitting internal diameter, and Section four is connected by the conical section and third section that length is 8mm
It connects, Section of four length is long 14mm's, in which:
When tube wall thickness T≤1.8, A=2/3*T
When tube wall thickness T > 1.8, A=4/5*T
B=A-0.5.
4. hydro-forming mould used in a kind of aluminium alloy bicycle frame section tube hydroforming process according to claim 1
Tool, it is characterised in that: including upper mold (1) and lower die (2), what upper mold can move is positioned at right above lower die, upper die and lower die
Above corresponding to be formed with type chamber, the type chamber of upper die and lower die be able to dock the shape of formation Yu pipe fitting (3) final molding
Matched monolithic devices chamber is embedded connection by concave inward structure and outer male structure on the lower die upper side and upper mold downside, and
Type chamber is located in outer male structure and concave inward structure.
5. hydroforming die according to claim 4, it is characterised in that: the concave inward structure side wall and evagination structure side
Wall passes through taper face contact.
6. hydroforming die according to claim 4, it is characterised in that: the outer male structure root is formed with fillet knot
Structure, the straightway that evagination structure length removes fillet section is 8~12mm.
7. hydroforming die according to claim 4, it is characterised in that: between the outer male structure and concave inward structure
It is embedded in gap are as follows: hydraulic 0.05mm.
8. hydroforming die according to claim 4, it is characterised in that: forced area is big in the upper die and lower die
One upper to form outer male structure, the type chamber formed in upper die and lower die at left and right sides of pipe fitting die joint high and low fall for 10mm with
On one on form concave inward structure.
9. hydroforming die according to claim 4, it is characterised in that: be additionally provided with angled-lift splits, the angled-lift splits can
Along being installed in lower die or upper mold for pipe fitting radial direction sliding, and angled-lift splits be able to extend into the intracavitary set depth of type, tiltedly
Be formed on sliding block along the molding inclined inclined-plane in direction, upper mold or lower die be equipped with the matched bevel structure of angled-lift splits, it is described
Bevel structure be able to be tight against the inclined-plane of angled-lift splits.
10. hydroforming die according to claim 9, it is characterised in that: be additionally provided with return springs, the reset bullet
Property part can be provided to angled-lift splits and keep exiting the elastic holding force in the intracavitary portion of type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910568136.5A CN110355256A (en) | 2019-06-27 | 2019-06-27 | Aluminium alloy bicycle frame section tube hydroforming process and its hydroforming die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910568136.5A CN110355256A (en) | 2019-06-27 | 2019-06-27 | Aluminium alloy bicycle frame section tube hydroforming process and its hydroforming die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110355256A true CN110355256A (en) | 2019-10-22 |
Family
ID=68215950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910568136.5A Pending CN110355256A (en) | 2019-06-27 | 2019-06-27 | Aluminium alloy bicycle frame section tube hydroforming process and its hydroforming die |
Country Status (1)
| Country | Link |
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| CN (1) | CN110355256A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111572687A (en) * | 2020-05-15 | 2020-08-25 | 明达铝业科技(太仓)有限公司 | Electric vehicle water injection thin-wall pipe lock hole integrated structure and pipe forming process thereof |
| CN116498427A (en) * | 2023-06-26 | 2023-07-28 | 南昌航空大学 | Elbow structure resistant to high temperature and high pressure and processing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116498427A (en) * | 2023-06-26 | 2023-07-28 | 南昌航空大学 | Elbow structure resistant to high temperature and high pressure and processing method thereof |
| CN116498427B (en) * | 2023-06-26 | 2023-09-08 | 南昌航空大学 | Processing method of high-temperature and high-pressure resistant elbow structure |
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