CN106670296A - Internal high-pressure forming die for forming pipe fitting of step structure and forming method thereof - Google Patents
Internal high-pressure forming die for forming pipe fitting of step structure and forming method thereof Download PDFInfo
- Publication number
- CN106670296A CN106670296A CN201611059789.3A CN201611059789A CN106670296A CN 106670296 A CN106670296 A CN 106670296A CN 201611059789 A CN201611059789 A CN 201611059789A CN 106670296 A CN106670296 A CN 106670296A
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- China
- Prior art keywords
- bushing
- drift
- pipe fitting
- forming
- mould
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
Abstract
The invention discloses an internal high-pressure forming die for forming a pipe fitting of a step structure and a forming method thereof. The die comprises an upper die body, a lower die body, a left lining, a right lining, a left puncher pin and a right puncher pin. In the early stage of forming, an initial distance exists between the left lining and the side wall of a cavity of the pipe fitting as well as between the right lining and the side wall of the cavity of the pipe fitting, and the middle expansion portion is supplemented with materials by properly increasing the axial feeding amount through the left pincher pin and the right pincher pin. In the later stage of forming, the left pincher pin and the right pincher pin stop axial feeding, the left lining and the right lining move opposite to each other, pushing force is exerted on the middle expansion portion, and the friction force between a pipe and the die is greatly reduced since the side wall of the expansion portion is incompletely attached to the left lining and the right lining. Therefore, pressure required for forming of fillets is remarkably lowered, the wall thickness is obviously decreased, and requirements for the maximum tonnage of a die closing press, the bearing capability required for the die, the reliability of a sealing structure and pressure of a supercharger are lowered while requirements for forming the pipe fitting of the step structure are met.
Description
Technical field
The invention belongs to pipe fitting plastic forming technology field, more particularly to a kind of inner high voltage for shaping hierarchic structure pipe fitting into
Shape mould and its manufacturing process.
Background technology
Between the more than ten years in past, increasingly serious market competition and environmental protection policy forces auto manufacturing to turn product type
It is changed into production light vehicle and reaches the vehicle structure purpose that low oil consumption, low emission ensure safety simultaneously.In order to as far as possible with low cost
Effectively achieve this purpose, it is necessary to which exploitation uses new lightweight material, alloy or composite；And research and develop and improve new
Above-mentioned lightweight material is converted into manufacturing technology lightweight, low cost, intensity is high, steady quality functional structure.From last century
The nineties rise, forming high pressure in pipe due to the remarkable advantage such as low cost, flexible high, formed product intensity is high, lightweight,
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
Obvious advantage, can improve the strength and stiffness of pipe fitting while reduces cost.Therefore in automobile, Aeronautics and Astronautics manufacture neck
Domain, has obtained wide application.Especially in automobile production, such as subframe of car, dashboard cross member, all gradually with
Inner high voltage hydraulic forming 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 mould 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 shaping are only capable of being optimized by changing axial feed and internal pressure load path,
The drawbacks of this mould structure has one substantially, when bulging terminates substantially, when shaping hierarchic structure fillet accounts for leading, due to pipe
Friction between material and mould, the means for changing 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 mould, the forming pressure of horn structure will be entered
One step is improved, and the equipment of even resulting in can not meet requirement, in addition with the increase of forming pressure, the friction between tubing and mould
Power is also significantly increased, and the easy excessive thinning of wall thickness even ftractures in causing fillet stowing operation.
The content of the invention
To solve the above mentioned problem that prior art is present, the present invention will design one kind and can reduce maximum to clamping pressure machine
The requirement of the pressure of bearing capacity, the reliability of sealing structure and booster needed for tonnage, mould, and ensure that fillet was filled
The satisfactory internal high pressure forming mould 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 mould for shaping hierarchic structure pipe fitting, including upper die and lower die, left bushing, right bushing, Zuo Chong
Head and right drift；High pressure water hole is provided with described left drift；It is cased with being cased with the right side outside left bushing, right drift outside described left drift
Bushing, described left bushing and right bushing are located at the left and right sides between upper die and lower die respectively；Described upper die and lower die, a left side
Bushing and right bushing composition mold cavity, mold cavity two ends are sealed by left drift and right drift；Described left bushing and right lining
Set has the function of axially being moved left and right along left drift and right drift respectively；Described upper die and lower die, left bushing and right bushing
Final shaping position composition pipe fitting die cavity.
A kind of manufacturing process of the internal high pressure forming mould for shaping hierarchic structure pipe fitting, comprises the following steps：
A, the left drift of promotion and right drift are axially inwardly moved simultaneously, complete tubing or so two sealings of end；
B, upper mould and lower mould is driven to complete matched moulds by clamping pressure machine sliding block, highly pressurised liquid is by the water under high pressure on left drift
Hole enters inside tubing, while left drift and right drift are while axial feed is apart from s1, make the big portion in tube bulge part and upper mould
Fitted with lower mould；
C, left drift and right drift stop motion, under forming pressure P, left bushing and right bushing are opened by initial position simultaneously
Begin axially inwardly displacement s0, until the pipe fitting cavity lateral respectively with the left and right sides is fitted, pressurize or raising pressure are to pipe
Part is formed, and shaping terminates rear release and molds pickup；
Described left bushing and right bushing must be fulfilled for the initial distance s of the pipe fitting cavity lateral of the left and right sides respectively as
Lower condition could be shaped compared with small round corner, while preventing vertical section from fold defect occur, 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, its displacement s0Relation with forming pressure P need to meet following relation
Formula (2)；
In formula, t is tube wall thickness, σsThe yield strength of tubing；
Described left drift and the axial feeding s of right drift1Value by shaping pipe fitting bulging constancy of volume principle calculate
Obtain, s1Value by formula (3) determine：
In formula, H is the length for shaping boss.
Compared with prior art, the invention has the advantages that：
Be changed to for original monoblock type internal high pressure forming mould split type by the present invention, newly increases left bushing and right bushing two
Part, left and right bushing being capable of move toward one another in forming process.Before forming the phase, left and right bushing and pipe fitting cavity lateral have at the beginning of one
Beginning distance, suitably increases axial feeding to carry out feed supplement to middle bulging position by left and right drift；Shaping later stage, left and right punching
Head stops axial feed, and now, left and right bushing starts move toward one another, applies a thrust to middle bulging position, by bulging
Position side wall produces a components of stress for radial direction, promotes straight section material dynamic to the displacement of shaping dies fillet part, this process
In, internal pressure can actually play a part of back pressure, also have a upward components of stress to bulging position side wall, be conducive to bulging
The filling of position small fillet radius, in addition in the process, bulging position side wall is not fitted completely with left and right bushing, tubing and mould
Frictional force between tool will be greatly reduced.Therefore, compared with the simple bulging of original monolithic mold tubing, the shaping of fillet position
Required pressure will be significantly reduced, and wall thickness reduction is obviously reduced, and can accomplish meeting with hierarchic structure pipe fitting forming requirement
While, reduce to clamping pressure machine maximum tonnage, bearing capacity, the reliability of sealing structure and booster needed for mould
The requirement of pressure, so as to reduce production cost, and contributes to tube wall thickness uniform, it is to avoid the wall thickness excessive thinning in forming process
And cracking.
Brief description of the drawings
Total 3, the accompanying drawing of the present invention, wherein：
Fig. 1 is the shaping dies schematic diagram of embodiments of the invention 1.
Fig. 2 is the shaping dies schematic diagram of embodiments of the invention 2.
Fig. 3 is the A-A of Fig. 2 to profile.
In figure：1-upper mould；2-tubing；3-lower mould；4-left bushing；5-right bushing；6-left drift；7-right drift；
8-high pressure water hole；9-pipe fitting；10-pipe fitting cavity lateral；11-shaping 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 shaping hierarchic structure pipe
The internal high pressure forming mould of part, including upper mould 1, lower mould 3, left bushing 4, right bushing 5, left drift 6 and right drift 7；A described left side
High pressure water hole 8 is provided with drift 6；It is cased with being cased with right bushing 5, a described left side outside left bushing 4, right drift 7 outside described left drift 6
Bushing 4 and right bushing 5 are located at the left and right sides between upper mould 1 and lower mould 3 respectively；Described upper mould 1, lower mould 3, the and of left bushing 4
Right bushing 5 constitutes mold cavity, and mold cavity two ends are sealed by left drift 6 and right drift 7；Described left bushing 4 and right bushing 5
There is the function of axially being moved left and right along left drift 6 and right drift 7 respectively；Described upper mould 1, lower mould 3, left bushing 4 and right lining
The final shaping position composition pipe fitting die cavity of set 5.
A kind of manufacturing process of the internal high pressure forming mould for shaping hierarchic structure pipe fitting, comprises the following steps：
A, the left drift 6 of promotion and right drift 7 are axially inwardly moved simultaneously, complete 2 or so two sealings of end of tubing；
B, upper mould 1 and lower mould 3 is driven to complete matched moulds by clamping pressure machine sliding block, highly pressurised liquid is by the height on left drift 6
Pressure water hole 8 enters inside tubing 2, while left drift 6 and right drift 7 are while axial feed is apart from s1, make the bulging part of tubing 2 big
Fitted with upper mould 1 and lower mould 3 in portion；
C, left drift 6 and the stop motion of right drift 7, under forming pressure P, left bushing 4 and right bushing 5 are simultaneously by initial bit
Put beginning axially inwardly displacement s0, until the pipe fitting cavity lateral 10 respectively with the left and right sides is fitted, pressurize or raising are pressed
Power is formed to pipe fitting 9, and shaping terminates rear release and molds pickup；
The initial distance s of described left bushing 4 and right bushing 5 respectively with the pipe fitting cavity lateral 10 of the left and right sides must expire
The following condition of foot could be shaped compared with small round corner, while preventing vertical section from fold defect occur, the value of s is determined by formula (1)：
In formula, D is the diameter for shaping boss 11, and d is the diameter of tubing 2；
In left bushing 4 and the moving process of right bushing 5, its displacement s0Relation with forming pressure P need to be met with ShiShimonoseki
It is formula (2)；
In formula, t is the wall thickness of tubing 2, σsThe yield strength of tubing 2；
Described left drift 6 and the axial feeding s of right drift 71Value by the bulging constancy of volume principle meter of shaping pipe fitting 9
Obtain, 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, shaping pipe fitting 9 is variable diameters straight tube bulging pipe fitting, the material of tubing 2 is DC04, diameter
It is 60mm, thickness is 1.5mm, a diameter of 80mm at middle bulging position, length is 100mm.
Using traditional internal high pressure forming mould, forming pressure is 120MPa, and the left and right amount of feeding is 18mm, and load path is
Linear loading.Through the least radius 8mm of pipe fitting 9 after internal high pressure forming process forming, minimum wall thickness (MINI W.) 1.036mm, reduction reaches
30%.
Testpieces is formed using the internal high pressure forming mould of shaping hierarchic structure pipe fitting 9 of the invention, left and right lining
3mm is taken apart from s between set and pipe fitting cavity lateral 10, load path is identical with traditional internal high pressure forming mould, and internal pressure only needs line
Property be loaded onto 100MPa, through the least radius of pipe fitting 9 after internal high pressure forming process forming be 0.8mm, minimum wall thickness (MINI W.) 1.135mm,
Maximum reduction is 24%.
Embodiment 2：As Figure 2-3, shaping pipe fitting 9 is that, with complicated axis bulging class pipe fitting, the material of tubing 2 is
DC04, a diameter of 56mm, thickness is 1.5mm, and the height of centre shaping boss 11 reaches 10mm, and length is 50mm.
Using traditional internal high pressure forming mould, forming pressure is 150MPa, and the left and right amount of feeding is 18mm, and load path is
Linear loading.Through the least radius 4.5mm of pipe fitting 9 after internal high pressure forming process forming, minimum wall thickness (MINI W.) 0.959mm, reduction reaches
36.1%.
Testpieces is formed using the internal high pressure forming mould of shaping hierarchic structure pipe fitting 9 of the invention, left and right lining
4mm is taken apart from s between set and pipe fitting cavity lateral 10, load path is identical with traditional internal high pressure forming mould, and internal pressure only needs line
Property be loaded onto 150MPa, be 3mm, minimum wall thickness (MINI W.) 1.04mm through the least radius of pipe fitting 9 after internal high pressure forming process forming, it is maximum
Reduction is 30.7%.
Claims (2)
1. it is a kind of shape hierarchic structure pipe fitting internal high pressure forming mould, it is characterised in that：Including upper mould (1), lower mould (3), a left side
Bushing (4), right bushing (5), left drift (6) and right drift (7), high pressure water hole (8) is provided with described left drift (6)；It is described
Left drift (6) outside be cased with being cased with right bushing (5), described left bushing (4) and right bushing outside left bushing (4), right drift (7)
(5) left and right sides between upper mould (1) and lower mould (3) is located at respectively；Described upper mould (1), lower mould (3), left bushing (4) and the right side
Bushing (5) constitutes mold cavity, and mold cavity two ends are sealed by left drift (6) and right drift (7)；Described left bushing (4) and
Right bushing (5) has the function of axially being moved left and right along left drift (6) and right drift (7) respectively；Described upper mould (1), lower mould
(3), the final shaping position composition pipe fitting die cavity of left bushing (4) and right bushing (5).
2. it is a kind of shape hierarchic structure pipe fitting internal high pressure forming mould manufacturing process, it is characterised in that：Comprise the following steps：
A, the left drift (6) of promotion and right drift (7) are while axially inwardly move, completion tubing (2) two sealings of end in left and right；
B, upper mould (1) and lower mould (3) is driven to complete matched moulds by clamping pressure machine sliding block, highly pressurised liquid is by left drift (6)
High pressure water hole (8) enters tubing (2) inside, while left drift (6) and right drift (7) are while axial feed is apart from s1, make tubing
(2) the big portion in bulging part fits with upper mould (1) and lower mould (3)；
C, left drift (6) and right drift (7) stop motion, under forming pressure P, left bushing (4) and right bushing (5) are while by first
Beginning, position started axially inwardly displacement s0, until the pipe fitting cavity lateral (10) respectively with the left and right sides is fitted, pressurize or
Improve pressure to form pipe fitting (9), shaping terminates rear release and molds pickup；
The initial distance s respectively with the pipe fitting cavity lateral (10) of the left and right sides is necessary for described left bushing (4) and right bushing (5)
Meeting following condition could be shaped compared with small round corner, while preventing vertical section from fold defect occur, the value of s is determined by formula (1)：
In formula, D is the diameter of shaping boss (11), and d is tubing (2) diameter；
In left bushing (4) and right bushing (5) moving process, its displacement s0Relation with forming pressure P need to meet following relation
Formula (2)；
In formula, t is tubing (2) wall thickness, σsThe yield strength of tubing (2)；
Described left drift (6) and the axial feeding s of right drift (7)1Value by shaping pipe fitting (9) bulging constancy of volume principle
It is calculated, s1Value by formula (3) determine：
In formula, H is the length of shaping boss (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 true CN106670296A (en) | 2017-05-17 |
| CN106670296B CN106670296B (en) | 2018-06-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019210649A1 (en) * | 2018-05-03 | 2019-11-07 | 哈尔滨工业大学 | Metal inner high pressure forming piece dimension control method and system |
| TWI689360B (en) * | 2019-06-28 | 2020-04-01 | 國立中山大學 | Processing method for folded pipe |
| CN111842608A (en) * | 2020-06-04 | 2020-10-30 | 浙大宁波理工学院 | Pressure expansion composite internal high-pressure forming device and process for torsion piece |
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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019210649A1 (en) * | 2018-05-03 | 2019-11-07 | 哈尔滨工业大学 | Metal inner high pressure forming piece dimension control method and system |
| US10940520B2 (en) | 2018-05-03 | 2021-03-09 | Harbin Institute Of Technology | Method and system for controlling dimensions of metal hydroformed parts |
| TWI689360B (en) * | 2019-06-28 | 2020-04-01 | 國立中山大學 | Processing method for folded pipe |
| CN111842608A (en) * | 2020-06-04 | 2020-10-30 | 浙大宁波理工学院 | Pressure expansion composite internal high-pressure forming device and process for torsion piece |
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| CN106670296B (en) | 2018-06-26 |
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