CN106670296B - A kind of manufacturing process for the internal high pressure forming mold for shaping hierarchic structure pipe fitting - Google Patents
A kind of manufacturing process for the internal high pressure forming mold for shaping hierarchic structure pipe fitting Download PDFInfo
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- CN106670296B CN106670296B CN201611059789.3A CN201611059789A CN106670296B CN 106670296 B CN106670296 B CN 106670296B CN 201611059789 A CN201611059789 A CN 201611059789A CN 106670296 B CN106670296 B CN 106670296B
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- bushing
- punch
- pipe fitting
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- forming
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- 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
-
- 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
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- 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 manufacturing process for the internal high pressure forming mold for shaping hierarchic structure pipe fitting, the mold includes upper die and lower die, left bushing, right bushing, left punch and right punch；Phase before forming of the invention, there are one initial distances with pipe fitting cavity lateral for left and right bushing, suitably increase axial feeding by left and right punch to carry out feed supplement to intermediate bulging position；The later stage is shaped, left and right punch stops axial feed, and left and right bushing starts to move toward one another, and applies a thrust to intermediate bulging position, since in the process, bulging position side wall is not bonded completely with left and right bushing, and the frictional force between tubing and mold will greatly reduce.Therefore, pressure needed for the forming of fillet position will significantly reduce, wall thickness reduction is obviously reduced, it can accomplish while meeting with hierarchic structure pipe fitting forming requirement, to reduce the requirement to the pressure of bearing capacity, the reliability of sealing structure and booster needed for clamping pressure machine maximum tonnage, mold.
Description
Technical field
The invention belongs to pipe fitting plastic forming technology field more particularly to it is a kind of shape hierarchic structure pipe fitting interior high pressure into
Shape mold and its manufacturing process.
Background technology
Between the more than ten years in past, increasingly serious market competition and environmental protection policy force auto manufacturing to turn product type
Become producing light vehicle and reach low oil consumption, low emission and ensure safe vehicle structure purpose simultaneously.In order to as possible with low cost
Effectively achieve this purpose, it is necessary to which exploitation uses new lightweight material, alloy or composite material；And it researches and develops and improves newly
Above-mentioned lightweight material is converted into that light-weight, at low cost, intensity is high, the functional structure of stable quality by manufacturing technology.From last century
The nineties rise, forming high pressure in pipe due to it is at low cost, flexible it is high, formed product intensity is high, the remarkable advantages such as light-weight,
All kinds of hollow light body components of manufacture are widely used in Automobile Industry Abroad.Tube Hydroforming (also known as internal high pressure forming) is a kind of
The advanced manufacturing technology of hollow integrated member is manufactured, is had compared with the hollow unit manufacturing process welded after traditional first punching press
Apparent advantage can improve the strength and stiffness of pipe fitting while reducing cost.Therefore in automobile, Aeronautics and Astronautics manufacture neck
Domain has obtained wide application.Especially in automobile production, such as the subframe of car, dashboard cross member, all gradually with
Interior high pressure hydroforming method substitutes original traditional diamond-making technique.For many pipe fittings, such as with hierarchic structure, taper knot
The pipe fitting of structure and rectangular configuration, it is one of main target to obtain a horn structure.
The internal high pressure forming mold of existing hierarchic structure pipe fitting uses monoblock type, and the diameter of intermediate cavity bulging is big
Small, wall thickness reduction and the radius of corner size of forming are only capable of optimizing by changing axial feed and internal pressure load path,
This mould structure there are one it is apparent the drawbacks of, when bulging terminates substantially, when forming hierarchic structure fillet accounts for leading, due to pipe
Friction between material and mold, changing the means of axial feed and internal pressure load path will be difficult to work, and with tubing wall
Thick increase and the application of high strength linepipe, using traditional internal high pressure forming mold, the forming pressure of horn structure will be into
One step improves, and even resulting in equipment cannot meet the requirements, in addition with the increase of forming pressure, the friction between tubing and mold
Power also significantly increases, and the easy excessive thinning of wall thickness in fillet stowing operation is caused even to crack.
Invention content
To solve the above problem of the existing technology, the present invention will design one kind and can reduce to clamping pressure machine maximum
The requirement of the pressure of bearing capacity, the reliability of sealing structure and booster needed for tonnage, mold, and ensure that fillet filled
The satisfactory internal high pressure forming mold of wall thickness and its manufacturing process in journey.
To achieve these goals, technical scheme is as follows：
A kind of internal high pressure forming mold for shaping hierarchic structure pipe fitting, including upper die and lower die, left bushing, right bushing, Zuo Chong
Head and right punch；Pressure hole is provided on the left punch；It is cased with being cased with right lining outside left bushing, right punch outside the left punch
Set, the left bushing and right the bushing left and right sides between upper die and lower die respectively；The upper die and lower die, left lining
Set and right bushing form mold cavity, and mold cavity both ends are sealed by left punch and right punch；The left bushing and right bushing
It is respectively provided with the function of axially being moved left and right along left punch and right punch；Upper die and lower die, left bushing and the right bushing is most
Whole shaping position forms pipe fitting cavity.
A kind of manufacturing process for the internal high pressure forming mold for shaping hierarchic structure pipe fitting, includes the following steps：
A, left punch and right punch is pushed axially inwardly to move simultaneously, completes the sealing of tubing or so two ends；
B, upper mold is driven to complete to mold with lower die by clamping pressure machine sliding block, highly pressurised liquid passes through the pressure hole on left punch
Into inside tubing, while left punch and right punch while axial feed distance s1, make the big portion in tube bulge part and upper mold and
Lower die is bonded；
C, left punch and right punch stop motion, under forming pressure P, left bushing and right bushing are opened simultaneously by initial position
Begin axially inwardly displacement distance s0, until the pipe fitting cavity lateral respectively with the left and right sides is bonded, pressurize or raising pressure are to pipe
Part is formed, and release and pickup is molded after forming；
The left bushing and right bushing must satisfy respectively with the initial distance s of the pipe fitting cavity lateral of the left and right sides as
Lower condition could be shaped compared with small round corner, while prevents vertical section from fold defect occur, and the value of s is determined by formula (1)：
In formula, D is the diameter for shaping boss, and d is pipe diameter；
In left bushing and right bushing moving process, displacement distance s0It need to meet following relationship with the relationship of forming pressure P
Formula (2)；
In formula, t is tube wall thickness, σsThe yield strength of tubing；
The left punch and the axial feeding s of right punch1Value by forming pipe fitting bulging constancy of volume principle calculate
It obtains, s1Value by formula (3) determine：
In formula, H is the length for shaping boss.
Compared with prior art, the invention has the advantages that：
Original monoblock type internal high pressure forming mold is changed to split type by the present invention, newly increases left bushing and right bushing two
Component, left and right bushing can move toward one another in forming process.Phase before forming, there are one just with pipe fitting cavity lateral for left and right bushing
Beginning distance suitably increases axial feeding to carry out feed supplement to intermediate bulging position by left and right punch；Shape later stage, left and right punching
Head stops axial feed, at this point, left and right bushing starts to move toward one another, applies a thrust to intermediate bulging position, passes through bulging
Position side wall generates the components of stress of a radial direction, straight section material is promoted to be moved to shaping dies fillet part displacement, this process
In, internal pressure can actually play the role of back pressure, and to bulging position side wall, also there are one the upward components of stress, are conducive to bulging
The filling of position small fillet radius, in addition in the process, bulging position side wall are not bonded completely with left and right bushing, tubing and mould
Frictional force between tool will greatly reduce.Therefore, compared with the simple bulging of original monolithic mold tubing, the forming of fillet position
Required pressure will significantly reduce, and wall thickness reduction is obviously reduced, and can accomplish meeting with hierarchic structure pipe fitting forming requirement
While, it reduces to bearing capacity needed for clamping pressure machine maximum tonnage, mold, the reliability of sealing structure and booster
The requirement of pressure so as to reduce production cost, and contributes to tube wall thickness uniform, avoids the wall thickness excessive thinning in forming process
And cracking.
Description of the drawings
The shared attached drawing 3 of the present invention is opened, wherein：
Fig. 1 is 1 shaping dies schematic diagram of the embodiment of the present invention.
Fig. 2 is 2 shaping dies schematic diagram of the embodiment of the present invention.
Fig. 3 is the A-A of Fig. 2 to sectional view.
In figure：1-upper mold；2-tubing；3-lower die；4-left bushing；5-right bushing；6-left punch；7-right punching
Head；8-pressure hole；9-pipe fitting；10-pipe fitting cavity lateral；11-forming boss.
Specific embodiment
Below in conjunction with drawings and examples, the present invention will be further described.As shown in Figure 1, a kind of forming hierarchic structure pipe
The internal high pressure forming mold of part, including upper mold 1, lower die 3, left bushing 4, right bushing 5, left punch 6 and right punch 7；The left side
Pressure hole 8 is provided on punch 6；It is cased with being cased with right bushing 5, the left lining outside left bushing 4, right punch 7 outside the left punch 6
Set 4 and the left and right sides between upper mold 1 and lower die 3 respectively of right bushing 5；Upper mold 1, lower die 3, left bushing 4 and the right side
Bushing 5 forms mold cavity, and mold cavity both ends are sealed by left punch 6 and right punch 7；The left bushing 4 and right bushing 5
It is respectively provided with the function of axially being moved left and right along left punch 6 and right punch 7；Upper mold 1, lower die 3, left bushing 4 and the right lining
The final shaping position composition pipe fitting cavity of set 5.
A kind of manufacturing process for the internal high pressure forming mold for shaping hierarchic structure pipe fitting, includes the following steps：
A, left punch 6 and right punch 7 is pushed axially inwardly to move simultaneously, completes the sealing of 2 or so two ends of tubing；
B, upper mold 1 is driven to complete to mold with lower die 3 by clamping pressure machine sliding block, highly pressurised liquid passes through the height on left punch 6
Hole 8 is pressed to enter inside tubing 2, while left punch 6 and right punch 7 while axial feed distance s1, make the 2 big portion in bulging part of tubing
It is bonded with upper mold 1 and lower die 3；
C, 7 stop motion of left punch 6 and right punch, under forming pressure P, left bushing 4 and right bushing 5 are simultaneously by initial
Position starts axially inwardly displacement distance s0, until the pipe fitting cavity lateral 10 respectively with the left and right sides is bonded, pressurize or raising
Pipe fitting 9 is formed in pressure, and release and pickup is molded after forming；
The left bushing 4 and right bushing 5 are necessary with the initial distance s of the pipe fitting cavity lateral 10 of the left and right sides respectively
Meeting following condition could shape compared with small round corner, while prevent vertical section from fold defect occur, and the value of s is determined by formula (1)：
In formula, D is the diameter for shaping boss 11, and d is 2 diameter of tubing；
In 5 moving process of left bushing 4 and right bushing, displacement distance s0It need to meet with ShiShimonoseki with the relationship of forming pressure P
It is formula (2)；
In formula, t be 2 wall thickness of tubing, σsThe yield strength of tubing 2；
The left punch 6 and the axial feeding s of right punch 71Value by forming pipe fitting bulging constancy of volume principle meter
It obtains, s1Value by formula (3) determine：
In formula, H is the length for shaping boss 11.
Below by embodiment, the present invention will be further described.
Embodiment 1：As shown in Figure 1, forming pipe fitting be variable diameters straight tube bulging pipe fitting, 2 material of tubing be DC04, diameter
For 60mm, thickness 1.5mm, a diameter of 80mm at intermediate bulging position, length 100mm.
Using traditional internal high pressure forming mold, forming pressure 120MPa, the left and right amount of feeding is 18mm, and load path is
Linear loading.Pipe fitting 9 least radius 8mm after internal high pressure forming process forming, minimum wall thickness (MINI W.) 1.036mm, reduction reach
30%.
Testpieces is formed in the internal high pressure forming mold of forming hierarchic structure pipe fitting using the present invention, left and right bushing
Distance s takes 3mm between pipe fitting cavity lateral 10, and load path is identical with traditional internal high pressure forming mold, and internal pressure only needs linearly
Be loaded onto 100MPa, 9 least radius of pipe fitting after internal high pressure forming process forming be 0.8mm, minimum wall thickness (MINI W.) 1.135mm, most
Big reduction is 24%.
Embodiment 2：As Figure 2-3, forming pipe fitting is with complicated axis bulging class pipe fitting, and 2 material of tubing is
DC04, a diameter of 56mm, thickness 1.5mm, the height of centre forming boss 11 reach 10mm, length 50mm.
Using traditional internal high pressure forming mold, forming pressure 150MPa, the left and right amount of feeding is 18mm, and load path is
Linear loading.Pipe fitting 9 least radius 4.5mm after internal high pressure forming process forming, minimum wall thickness (MINI W.) 0.959mm, reduction reach
36.1%.
Testpieces is formed in the internal high pressure forming mold of forming hierarchic structure pipe fitting using the present invention, left and right bushing
Distance s takes 4mm between pipe fitting cavity lateral 10, and load path is identical with traditional internal high pressure forming mold, and internal pressure only needs linearly
150MPa is loaded onto, 9 least radius of pipe fitting after internal high pressure forming process forming is 3mm, minimum wall thickness (MINI W.) 1.04mm, and maximum subtracts
Thin rate is 30.7%.
Claims (1)
1. a kind of manufacturing process for the internal high pressure forming mold for shaping hierarchic structure pipe fitting, the shaping dies include upper mold
(1), lower die (3), left bushing (4), right bushing (5), left punch (6) and right punch (7) are provided with height on the left punch (6)
It presses hole (8)；It is cased with being cased with right bushing (5), the left bushing outside left bushing (4), right punch (7) outside the left punch (6)
(4) and right bushing (5) left and right sides between upper mold (1) and lower die (3) respectively；It is the upper mold (1), lower die (3), left
Bushing (4) and right bushing (5) composition mold cavity, mold cavity both ends are sealed by left punch (6) and right punch (7)；Described
Left bushing (4) and right bushing (5) are respectively provided with the function of axially being moved left and right along left punch (6) and right punch (7)；Described is upper
Mould (1), lower die (3), left bushing (4) and right bushing (5) final shaping position composition pipe fitting cavity；
It is characterized in that：The manufacturing process includes the following steps：
A, left punch (6) and right punch (7) are pushed while is axially inwardly moved, completes the sealing of two ends in tubing (2) left and right；
B, upper mold (1) is driven to complete to mold with lower die (3) by clamping pressure machine sliding block, highly pressurised liquid passes through on left punch (6)
Pressure hole (8) is internal into tubing (2), while left punch (6) and right punch (7) while axial feed distance s1, make tubing (2)
The big portion in bulging part is bonded with upper mold (1) and lower die (3)；
C, left punch (6) and right punch (7) stop motion, under forming pressure P, left bushing (4) and right bushing (5) while by first
Beginning position starts axially inwardly displacement distance s0, until being bonded respectively with the pipe fitting cavity lateral of the left and right sides (10), pressurize or
It improves pressure pipe fitting (9) is formed, release and pickup is molded after forming；
The left bushing (4) and right bushing (5) is necessary with the initial distance s of the pipe fitting cavity lateral of the left and right sides (10) respectively
Meeting following condition could shape compared with small round corner, while prevent vertical section from fold defect occur, and the value of s is determined by formula (1)：
In formula, D is the diameter for shaping boss (11), and d is tubing (2) diameter；
In left bushing (4) and right bushing (5) moving process, displacement distance s0It need to meet following relationship with the relationship of forming pressure P
Formula (2)；
In formula, t be tubing (2) wall thickness, σsThe yield strength of tubing (2)；
The left punch (6) and the axial feeding s of right punch (7)1Value by forming pipe fitting bulging constancy of volume principle calculate
It obtains, s1Value by formula (3) determine：
In formula, H is the length for shaping boss (11).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611059789.3A CN106670296B (en) | 2016-11-24 | 2016-11-24 | A kind of manufacturing process for the internal high pressure forming mold for shaping hierarchic structure pipe fitting |
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| CN201611059789.3A CN106670296B (en) | 2016-11-24 | 2016-11-24 | A kind of manufacturing process for the internal high pressure forming mold for shaping hierarchic structure pipe fitting |
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| CN106670296A CN106670296A (en) | 2017-05-17 |
| CN106670296B true CN106670296B (en) | 2018-06-26 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108687210B (en) * | 2018-05-03 | 2019-05-14 | 哈尔滨工业大学 | A kind of metal internal high pressure forming part dimensional control methods and system |
| TWI689360B (en) * | 2019-06-28 | 2020-04-01 | 國立中山大學 | Processing method for folded pipe |
| CN111842608B (en) * | 2020-06-04 | 2021-02-05 | 浙大宁波理工学院 | Pressure expansion composite internal high-pressure forming device and process for torsion piece |
| CN112808836A (en) * | 2021-02-04 | 2021-05-18 | 浙江正康实业股份有限公司 | Water expansion forming device and forming process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS632523A (en) * | 1986-06-20 | 1988-01-07 | Hitachi Ltd | Sealing method for split die |
| CN103272910A (en) * | 2013-05-20 | 2013-09-04 | 哈尔滨工业大学 | Tubular product hydraulic forming device capable of achieving inside and outside pressurization |
| CN105710181A (en) * | 2016-02-03 | 2016-06-29 | 中国科学院金属研究所 | Forming method of large-deformation small-fillet thin-wall hollow component |
| CN206215732U (en) * | 2016-11-24 | 2017-06-06 | 一重集团大连设计研究院有限公司 | A kind of internal high pressure forming mould for shaping hierarchic structure pipe fitting |
-
2016
- 2016-11-24 CN CN201611059789.3A patent/CN106670296B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS632523A (en) * | 1986-06-20 | 1988-01-07 | Hitachi Ltd | Sealing method for split die |
| CN103272910A (en) * | 2013-05-20 | 2013-09-04 | 哈尔滨工业大学 | Tubular product hydraulic forming device capable of achieving inside and outside pressurization |
| CN105710181A (en) * | 2016-02-03 | 2016-06-29 | 中国科学院金属研究所 | Forming method of large-deformation small-fillet thin-wall hollow component |
| CN206215732U (en) * | 2016-11-24 | 2017-06-06 | 一重集团大连设计研究院有限公司 | A kind of internal high pressure forming mould for shaping hierarchic structure pipe fitting |
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