CN106513487B - A kind of low pressure preformation method based on interior high-pressure molding - Google Patents
A kind of low pressure preformation method based on interior high-pressure molding Download PDFInfo
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- CN106513487B CN106513487B CN201610781907.5A CN201610781907A CN106513487B CN 106513487 B CN106513487 B CN 106513487B CN 201610781907 A CN201610781907 A CN 201610781907A CN 106513487 B CN106513487 B CN 106513487B
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- pipe fitting
- pressure
- interior high
- low pressure
- liquid
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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
-
- 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
- B21D26/041—Means for controlling fluid parameters, e.g. pressure or temperature
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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)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of low pressure preformation methods based on interior high-pressure molding, and pipe fitting to be formed is put into the die cavity of mold, inject liquid into the pipe fitting to be formed, pass through mold clamping so that pipe fitting side wall deforms upon.Pass through the low pressure preformation method based on interior high-pressure molding of above-mentioned optimization design, utilize existing interior high pressure forming device, it is cumbersome that additional process in traditional filling mode is solved by way of changing filled media, simplify manufacturing procedure, by keeping being in low-pressure state in pipe fitting in forming process, prevent formation of tubes from deforming upon.
Description
Technical field
The present invention relates to formation of tubes technical field more particularly to a kind of preforming sides of low pressure based on interior high-pressure molding
Method.
Background technology
Interior high-pressure molding part is to be applied to automobile chassis, body structure in contemporary automotive industry in order to realize lightweight
A kind of integral molding technology of the hollow variable cross-section product of the abnormity such as part, end tube.When usually processing, it is both full that serious hope has obtained some
Sufficient automotive light weight technology and hollow structural component easy to process, however it is this to ensure that light-weight design only has minority to meet in practice
It is required that most lightweight product considers that with the assembly of other component be all high distortion and the larger abnormity of changes of section
Pipe fitting, sometimes perimeter of section variation are likely to be breached 50mm -70mm, are if being converted into pipe fittingIt is right
Interior high-pressure molding one-step shaping or low pressure molding, this moulding letter are generally only needed in the simple product of general changes of section
Single lightweight product is fewer, but many products are all multiple variable cross-sections and changes of section is irregular, can not pass through letter
High-pressure molding in a single step.Interior high-pressure molding technology can at this time be used and pre-molding technology combines, interior high-pressure molding is
The pipe of certain length is badly put into mold, under the action of internal liquid (water or oil) pressure, passes through pressure in control and material
Stream is dynamic, keeps pipe bad to radially expanding, and generates the manufacturing technology that plastotype deformation carrys out formed hollow structural member, pre-molding
Belong to the householder method of interior high-pressure molding, pre-molding is put into the round pipe of certain length and close approximate of final products
The direction that compacting in advance makes pipe tend to close to final profile is carried out in profile generates plastic deformation to solve straight tube blank and wheel
A kind of method for the problem of profile face interferes with each other.
There are mainly three types of the pre-molding technologies used at present：
The first is to be directed to the fairly simple product of changes of section, this to be easy to molding product, main using between most
Product between finished product and pipe makes the mode of mold and then directly precompressed to be molded.
For second to be directed to the irregular product of changes of section, using filled into pipe mobility that some play a supportive role compared with
The medium (wax, lead or tin) of difference.Medium is done semi-solid state before being pre-molding and will by this traditional filling mode
It inserts in pipe (in order to ensure the uniform of filled media in this, need etc. control filled media by way of quality
Amount), then pipe that filling is completed is put into pre-molding mold completion pre-molding process, finally again will be after pre-molding
Pipe in medium it is molten by way of heating withdraw, then residual dielectric is cleaned, finally pipe is put into again in
High-pressure molding in being carried out in high-pressure molding mold.
Similar with the second situation in third, many products are all the pipe fittings for belonging to twisted state, and normal mode is
It first passes through and goes for a stroll together, the product after going for a stroll then is put into subsequent molding or preforming tool (such as fruit product complexity
Need) carry out in high-pressure molding, but the hot junction that actually can especially connect with engine there are many product is vented product often
Encounter such a case：Elbow radius is too small can not be around, between both ends are curved when multistep bend pipe straight-arm it is too small or without straight-arm around
Curved difficulty.It at this time can also use the filled media and then distortion bend pipe is obtained by way of press-bending that the second situation refers to.
As described above, current conventional filling procedures is preforming there are cumbersome, additional process is more, since filling is situated between
Unstable problem is molded caused by matter is uneven, human cost waste is big, while the increase of cumbersome operation, process results in
Low production efficiency, and the labor intensity of employee also greatly increases.
Needs are processed according to pipe fitting, when needing recessed portion is processed on round or rectangular tube section, due to changes of section
It is larger, and perimeter of section also changes greatly.The pipe that we generally buy on the market is all circular hollow pipe with one
The round pipe of section processes the changeable complex product in the big section of this profile variations, it would be desirable to pre-molding technology is introduced, I
Thirst for directly suppressing pipe with making mold close to the intermediate products of final profile.However, this complex section
Direct precompressed if product intermediate cross-section can be caused inwardly to collapse even form type dead angle of rising and influence final interior high-pressure molding.
Invention content
To solve technical problem present in background technology, the present invention propose a kind of low pressure based on interior high-pressure molding in advance at
Type method.
A kind of low pressure preformation method based on interior high-pressure molding proposed by the present invention, includes the following steps：
S1, pipe fitting to be formed is put into the die cavity of mold, injects liquid into the pipe fitting to be formed；
S2, pass through mold clamping so that the pipe fitting side wall in S1 deforms upon.
Preferably, in S1, water or oil are injected into the pipe fitting to be formed.
Preferably, in S1, normal-pressure liquid is injected into the pipe fitting to be formed.
Preferably, in S2, fluid pressure P≤P in the pipe fitting is kept in clamping processC, PCFor pipe fitting side wall shape
Transformation force threshold.
Preferably, PC=2 δ t/ (D-2t), wherein D is tube outer diameter to be processed, and t is tube wall thickness, and δ is tube material
Yield stress.
Preferably, in S2, by the way that the liquid export in the pipe fitting is reduced the fluid pressure in the pipe fitting.
Preferably, in S2, reduce the fluid pressure in the pipe fitting by increasing the liquid storage space in the pipe fitting.
Preferably, in S2, increase the liquid storage space in the pipe fitting simultaneously at the pipe fitting both ends.
Preferably, in S2, in clamping process, keep P invariable.
In the present invention, pipe fitting to be formed is put into mold by the low pressure preformation method based on interior high-pressure molding proposed
Die cavity in, inject liquid into the pipe fitting to be formed, pass through mold clamping so that pipe fitting side wall deforms upon.By upper
The low pressure preformation method based on interior high-pressure molding for stating optimization design passes through change using existing interior high pressure forming device
The mode of filled media solves in traditional filling mode that additional process is cumbersome, manufacturing procedure is simplified, by being molded
It keeps being in low-pressure state in pipe fitting in the process, prevents formation of tubes from deforming upon.
Description of the drawings
A kind of preforming dress of low pressure for low pressure preformation method based on interior high-pressure molding that Fig. 1 is proposed to realize the present invention
The structural schematic diagram set.
Specific implementation mode
As shown in FIG. 1, FIG. 1 is realize a kind of the low of low pressure preformation method based on interior high-pressure molding proposed by the present invention
Press the structural schematic diagram of pre-shaping device.
A kind of low pressure preformation method based on interior high-pressure molding proposed by the present invention, includes the following steps：
S1, pipe fitting to be formed is put into the die cavity of mold, injects liquid into the pipe fitting to be formed；
S2, pass through mold clamping so that the pipe fitting side wall in S1 deforms upon.
In the present embodiment, the low pressure preformation method based on interior high-pressure molding proposed, pipe fitting to be formed is put into
In the die cavity of mold, liquid is injected into the pipe fitting to be formed, passes through mold clamping so that pipe fitting side wall deforms upon.It is logical
The low pressure preformation method based on interior high-pressure molding for crossing above-mentioned optimization design is passed through using existing interior high pressure forming device
The mode for changing filled media solves in traditional filling mode that additional process is cumbersome, simplifies manufacturing procedure, by
It keeps being in low-pressure state in pipe fitting in forming process, prevents formation of tubes from deforming upon.
In other specific implementation modes, in S1, normal-pressure liquid is injected into the pipe fitting to be formed.
In other specific implementation modes, in S2, kept in clamping process fluid pressure P in the pipe fitting≤
PC, PCFor pipe fitting side wall deformation pressure threshold value.
In other specific implementation modes, PC=2 δ t/ (D-2t), wherein D is tube outer diameter to be processed, and t is pipe wall
Thickness, δ are the yield stress of tube material.
In other specific implementation modes, in S2, by the way that the liquid export in the pipe fitting is reduced in the pipe fitting
Fluid pressure.
In other specific implementation modes, in S2, the pipe fitting is reduced by the liquid storage space increased in the pipe fitting
Interior fluid pressure.
In further specific implementation mode, in S2, increase the liquid storage in the pipe fitting simultaneously at the pipe fitting both ends
Space.
In other specific implementation modes, in S2, in clamping process, keep P invariable.
Below in embodiment combine Fig. 1 low pressure pre-shaping device be described in detail the low pressure based on interior high-pressure molding in advance at
Type method.
Referring to Fig.1, the present embodiment proposes a kind of low pressure pre-shaping device, including：Upper mold 1, lower die 2, first into fluid cylinder 3,
First seal assembly, the second seal assembly；
The die cavity for accommodating pipe fitting 8 to be formed is formed between upper mold 1 and lower die 2, the die cavity both ends are respectively provided with first and open
Mouth and the second opening, the first seal assembly and the second seal assembly are sealingly mounted at the first opening and the second opening respectively；
First seal assembly includes the first sealed body 41, the first guide rod 42, the first elastic component 43, first seal 44,
First guide rod 42 is horizontally set on 41 side of the first sealed body, is equipped with the first delivery hole in the first sealed body 41, first leads
The second delivery hole is equipped in bar 42, the first delivery hole and the second delivery hole form the first liquid-conveying ducts, 44 middle part of first seal
It is set on the first guide rod 42 equipped with first through hole and by the first through hole, first seal 44 is used for and pipe fitting to be formed
8 inner wall sealings coordinate, and the first elastic component 43 is between the first sealed body 41 and first seal 44；
First is connected into fluid cylinder 3 with the first liquid-conveying ducts for passing through the first liquid-conveying ducts into the pipe fitting 8 to be formed
Feed liquor.
In the specific work process of the low pressure pre-shaping device of the present embodiment, pipe fitting 8 to be formed is placed in lower die first,
Then pipe fitting both ends are sealed by the first seal assembly and the second seal assembly, first into fluid cylinder to the pipe fitting 8 to be formed
Interior injection water at atmospheric pressure, then molds upper die and lower die so that pipe fitting side wall deforms upon, and in the process, water at atmospheric pressure is in pipe
Inner support power is formed inside part；As pipe fitting side wall deforms upon, inside pipe fitting pressure gradually increases, when pressure increases to default pressure
When power, first seal is slided to the first sealed body direction under pressure so that and inside pipe fitting fluid space increases, from
And realize the slow pressure release of inside pipe fitting, ensure that pressure P is not more than pipe fitting side wall deformation pressure threshold value P in pipe fittingC, prevent pressure mistake
Tube wall is damaged greatly.
Fluid pressure pressure release is stablized when in order to improve formation of tubes, and the second seal assembly includes the second sealed body, second
Guide rod, the second elastic component, second seal, the second guide rod are horizontally set on 41 2 side of the first sealed body, the second sealed body
It is interior to be equipped with third delivery hole, the 4th delivery hole is equipped in the second guide rod, third delivery hole and the 4th delivery hole form the second drain
Channel, second seal middle part are equipped with the second through-hole and are set on the second guide rod by second through-hole, second seal
For coordinating with sealed by inner wall of pipe parts to be formed, the second elastic component is between the second sealed body and second seal；Second
It is connected into fluid cylinder with the second liquid-conveying ducts for passing through the second liquid-conveying ducts feed liquor into the pipe fitting to be formed；When in pipe fitting
When pressure is more than preset pressure threshold value, first seal and second seal are moved to both ends simultaneously, increase the liquid storage in pipe fitting
Space carries out pressure release so that pipe fitting side wall stress equalization to realize from both sides to pipe fitting.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of low pressure preformation method based on interior high-pressure molding, which is characterized in that include the following steps：
S1, pipe fitting to be formed is put into the die cavity of mold, injects liquid into the pipe fitting to be formed；
S2, pass through mold clamping so that the pipe fitting side wall in S1 deforms upon；
In clamping process, fluid pressure P≤P in the pipe fitting is keptC, PCFor pipe fitting side wall deformation pressure threshold value；PC=2 δ
T/ (D-2t), wherein D is tube outer diameter to be processed, and t is tube wall thickness, and δ is the yield stress of tube material, can be by by institute
The export of the liquid in pipe fitting is stated to reduce the fluid pressure in the pipe fitting or by increasing the liquid storage space in the pipe fitting subtract
Fluid pressure in the small pipe fitting；
The method using following low pressure pre-shaping devices realize, including：Upper mold (1), lower die (2), first are into fluid cylinder (3),
One seal assembly, the second seal assembly；
The die cavity for accommodating pipe fitting (8) to be formed is formed between upper mold (1) and lower die (2), the die cavity both ends are respectively provided with first
Opening and the second opening, the first seal assembly and the second seal assembly are sealingly mounted at the first opening and the second opening respectively；
First seal assembly includes the first sealed body (41), the first guide rod (42), the first elastic component (43), first seal
(44), the first guide rod (42) is horizontally set on the first sealed body (41) side, is led equipped with first in the first sealed body (41)
Fluid apertures, is equipped with the second delivery hole, the first delivery hole and the second delivery hole the first liquid-conveying ducts of formation in the first guide rod (42), and first
It is equipped with first through hole in the middle part of sealing element (44) and is set on the first guide rod (42) by the first through hole, first seal
(44) it is used to coordinate with pipe fitting to be formed (8) inner wall sealing, the first elastic component (43) is located at the first sealed body (41) and first
Between sealing element (44)；First is connected into fluid cylinder (3) with the first liquid-conveying ducts for being waited for into described by the first liquid-conveying ducts
Type pipe fitting (8) interior feed liquor.
2. the low pressure preformation method according to claim 1 based on interior high-pressure molding, which is characterized in that in S1, to
Injection water or oil in the pipe fitting to be formed.
3. the low pressure preformation method according to claim 1 based on interior high-pressure molding, which is characterized in that in S1, to
Normal-pressure liquid is injected in the pipe fitting to be formed.
4. the low pressure preformation method according to claim 1 based on interior high-pressure molding, which is characterized in that in S2,
The pipe fitting both ends increase the liquid storage space in the pipe fitting simultaneously.
5. the low pressure preformation method according to claim 1 based on interior high-pressure molding, which is characterized in that in S2,
In clamping process, keep P invariable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610781907.5A CN106513487B (en) | 2016-08-30 | 2016-08-30 | A kind of low pressure preformation method based on interior high-pressure molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610781907.5A CN106513487B (en) | 2016-08-30 | 2016-08-30 | A kind of low pressure preformation method based on interior high-pressure molding |
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| Publication Number | Publication Date |
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| CN106513487A CN106513487A (en) | 2017-03-22 |
| CN106513487B true CN106513487B (en) | 2018-10-12 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108397266A (en) * | 2018-04-26 | 2018-08-14 | 清华大学苏州汽车研究院（相城） | A kind of monolith honeycomb catalysts intake elbow hot gas bulging process equipment and processing technology |
| CN110153267A (en) * | 2019-07-02 | 2019-08-23 | 哈尔滨理工大学 | A kind of manufacturing process of the special process part based on the forming of pipe internal-filling liquid |
| CN114653806B (en) * | 2022-03-01 | 2023-12-22 | 哈尔滨工业大学（威海） | Preforming method for high-strength steel reducing tubular part |
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|---|---|---|---|---|
| JP2002096117A (en) * | 2000-09-18 | 2002-04-02 | Honda Motor Co Ltd | Bulging apparatus |
| CN1792493A (en) * | 2005-12-19 | 2006-06-28 | 河南科技大学 | Method for forming magnesium alloy pipe fitting |
| CN101050763A (en) * | 2006-04-03 | 2007-10-10 | 徐兆火 | Diaphragm pump of constant pressure type |
| CN104438540A (en) * | 2014-11-26 | 2015-03-25 | 西安交通大学 | Low-pressure internal high pressure forming device for torsion beam |
| CN105855344A (en) * | 2015-01-21 | 2016-08-17 | 保隆(安徽)汽车配件有限公司 | Forming method for small-radius bent pipes |
-
2016
- 2016-08-30 CN CN201610781907.5A patent/CN106513487B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002096117A (en) * | 2000-09-18 | 2002-04-02 | Honda Motor Co Ltd | Bulging apparatus |
| CN1792493A (en) * | 2005-12-19 | 2006-06-28 | 河南科技大学 | Method for forming magnesium alloy pipe fitting |
| CN101050763A (en) * | 2006-04-03 | 2007-10-10 | 徐兆火 | Diaphragm pump of constant pressure type |
| CN104438540A (en) * | 2014-11-26 | 2015-03-25 | 西安交通大学 | Low-pressure internal high pressure forming device for torsion beam |
| CN105855344A (en) * | 2015-01-21 | 2016-08-17 | 保隆(安徽)汽车配件有限公司 | Forming method for small-radius bent pipes |
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| CN106513487A (en) | 2017-03-22 |
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