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 PDF

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Publication number
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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China
Prior art keywords
pipe fitting
pressure
interior high
low pressure
liquid
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CN201610781907.5A
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CN106513487A (en
Inventor
邓小波
陈旭琳
郑玉磊
徐炎
杨杰
刘兵
罗强丰
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BAOLONG (ANHUI) AUTOMOTIVE Corp
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BAOLONG (ANHUI) AUTOMOTIVE Corp
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02Shaping 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
    • B21D26/033Deforming tubular bodies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02Shaping 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
    • B21D26/033Deforming tubular bodies
    • B21D26/041Means for controlling fluid parameters, e.g. pressure or temperature

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

A kind of low pressure preformation method based on interior high-pressure molding
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.
CN201610781907.5A 2016-08-30 2016-08-30 A kind of low pressure preformation method based on interior high-pressure molding Active CN106513487B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (5)

* Cited by examiner, † Cited by third party
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
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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