CN109158458A - A method of pipe liquid filled press-bending is carried out using composite filled medium - Google Patents
A method of pipe liquid filled press-bending is carried out using composite filled medium Download PDFInfo
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- CN109158458A CN109158458A CN201811156331.9A CN201811156331A CN109158458A CN 109158458 A CN109158458 A CN 109158458A CN 201811156331 A CN201811156331 A CN 201811156331A CN 109158458 A CN109158458 A CN 109158458A
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- pipe
- bending
- medium
- composite
- composite filled
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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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/15—Bending tubes using mandrels or the like using filling material of indefinite shape, e.g. sand, plastic material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a kind of methods for carrying out pipe liquid filled press-bending using composite filled medium, belong to metal-pressed machine technical field, include the following steps: Step 1: sealing, positioning stage: composite filled medium is put into pipe；Pipe is placed on cavity plate, and left and right is had a haircut while pipe is got into movement until composite filled medium is held on push top top；Floating pressing block on bending die compresses pipe in vertical direction；Step 2: low pressure supports matched moulds stage: being filled with liquid, liquid pressing to certain pressure P by the inlet in push top1And pressure maintaining, punch-pin are completed to mold downwards；Step 3: the high pressure bulging stage: for pressure needed for punch-pin load, booster, which is increased, is depressed into P2Make part bulging in place；Pressure release after bulging several minutes；Step 4；Discharging phase: punch-pin uplink in place, retract by left and right push top；It removes bend pipe to pour out composite filling material, forming finishes.The present invention solves the problems, such as that small curvature radius bend pipe forming is difficult, improves forming accuracy and stability.
Description
Technical field
The invention belongs to metal-pressed machine technical fields, carry out tubing using composite filled medium more particularly to a kind of
The method that filling liquid is bent.
Background technique
Aeronautics and Astronautics component requires high reliability, high security and quality as light as possible, thus to structural integrity,
Structure type and occupied space propose harsh requirement, should guarantee the global reliability of structure, while also to guarantee full
Quality as light as possible is used on the basis of sufficient intensity requirement, and sky as small as possible is occupied under the premise of meeting structural requirement
Between.
It is limited by structure space, the pipeline of small aero and unmanned plane requires to use small curvature radius bend pipe, makes
Material includes aluminium alloy, titanium alloy and high temperature alloy.Small curvature radius bend pipe can improve overall performance, realize that structure subtracts
Weight, and it is effectively saved space, it is ideal structure type.Small curvature radius bend pipe conventional manufacturing process has numerical controlled bending of pipe
Machine rotary draw bending pushes away o ing；For radius of curvature R b≤1 (Rb be pipe fitting bending neutral layer radius r and tube outer diameter d it
Than) and there is the tubing of straight wall section, it is most of using being welded into shape to semi-stamping.
Numerical-controlled bending, filling liquid bend in bending pipes, bending deformation area material outside by tensile stress effect and stretch
It is long, inside material by compression effect and shorten, the main compression chord in outside in tubing when internal pressure pushes away curved；Numerical-controlled bending and
Due to having rigid support on the inside of pipe when internal pressure pushes away curved, the aberration rate in section is low, but numerical-controlled bending is not suitable for bending radius
The tubing of Rb≤1, internal pressure push away the curved tubing for not being suitable for being bent straight wall section；Simple filling liquid is bent because cross section distortion is serious, because subtracting
Thin excessive and easy corrugation is so that application is few.
Summary of the invention
The present invention is to solve technical problem present in well-known technique, provides and a kind of carries out pipe using composite filled medium
The method that material filling liquid is bent.
The invention is realized in this way
A method of pipe liquid filled press-bending being carried out using composite filled medium, is included the following steps:
Step 1: sealing, positioning stage: first being put a certain amount of composite filled medium according to the length of pipe deformed region
Enter pipe；Then pipe is placed on to the cavity plate upper surface of bending die, when placement makes pipe have the part of composite filled medium just
To mold cavity；Pipe is got into left and right push top while movement until composite filled medium is held on push top top；Floating on bending die
Binder block compresses pipe in vertical direction；
Step 2: low pressure support matched moulds stage: liquid is filled with by the inlet in any push top in left and right, make liquid via
The medium intake line being connected to pipe inner cavity enters pipe；Liquid is pressurized to certain pressure P by the booster outside push top1And
Keep pressure constant, slowly movement molds punch-pin up to completing downwards；
Step 3: the high pressure bulging stage: for pressure needed for punch-pin load, booster, which is increased, is depressed into P2Arrive part bulging
Position；Booster and punch-pin pressure release, shape the small curvature radius bend pipe met the requirements at this time after bulging several minutes；
Step 4；Discharging phase: in place, left and right push top returns on the outside of bend pipe punch-pin uplink；Bend pipe is removed to fill out compound
It fills material to pour out, forming finishes.
The technical solution overcomes the corrugated problem of cross section distortion and part, filled media and hydraulic while using can be very well
Part deformation behavior is controlled, small bend pipe straight wall Duan Yuechang avoids part from locally wrinkling in straight wall section；Furthermore composite filled medium exists
The compression and tensile stress received when being bent pipe when support inside pipe are opposite to be reduced, and circumferential cross-section is in the curved inside of pipe
Pipe circumferential cross-section is prevented to become ellipse and perimeter at random because part compression is offset in the presence of composite filled medium by compression
It shortens, the distance of shortening pipe bottom end to final type face；Feature bottom is by the opposite reduction of tensile stress when high pressure bulging, to subtract
The deflection of small pipe part.
Further, two mesolow of above-mentioned steps supports matched moulds stage, P1Reference value obtained according to following methods:
Wherein, t --- pipe thickness；D --- pipe outer diameter；σs--- pipe yield strength.
Further, 0≤P1≤60Mpa；
Further, P1≤P2≤300Mpa；
Further, the specific complex form of the composite filled medium includes copper core pipe and the flexibility that is wrapped in outside copper core pipe
Ring.
Further, the unilateral gap of the composite filled medium and pipe is 0.5-3mm.
Further, the push top end sleeve is equipped with the polyurethane rings of sealing, and the polyurethane rings outer diameter is than pipe internal diameter
Big 1-2mm.
Further, the punch-pin two sides of bending die are equipped with vertical nitrogen gas spring in step 1；The floating pressing block is set
In nitrogen gas spring lower end.
Further, the horizontal width m of the composite filled medium and the ratio of pipe outside diameter d are between 0.12-0.3.
Further, pipe raw material is stainless steel 304, pipe outside diameter d=34mm, wall thickness t=1mm；Low pressure P1=
22Mpa, the closure pressing speed 2mm/s of punch-pin；Bulging pressure P in step 32=220Mpa, bulging time are 5 minutes.
The positive effect of the present invention and advantage:
The present invention solves the problems, such as that the bending tube forming of small curvature radius bend pipe especially Rb≤1 is difficult, improves forming essence
Degree and stability；Overcome in pure flexible forming clamping process the distortion in pipe section and because locally wrinkling caused by insufficient rigidity；
The size for changing the circumferentially opposed compression in section makes the opposite compression of pipe contact upper mold mould surface portion become smaller, and alleviation connects
Deflection when touching down model face bulging.The uniformity of raising both ends straight wall section thickness, solution radius of curvature R b≤1, t/d≤
0.03,90 degree of bending angle and there is straight wall section, the method for the present invention is suitble to material to have stainless steel, high temperature alloy, aluminium alloy, titanium alloy
And the nonmetallic good material of plasticity.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of pipe forming initial position provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of pipe forming final position state provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of composite filled medium provided in an embodiment of the present invention；
Fig. 4 is the sectional view along A-A of Fig. 3；
Fig. 5 is the cross-sectional view of pipe provided in an embodiment of the present invention；
Fig. 6 is that liquid pressing curve provided in an embodiment of the present invention changes over time schematic diagram；
Fig. 7 is molding displacement provided in an embodiment of the present invention and pressure P1 curve synoptic diagram.
In figure, 1, pipe；2, composite filled medium；2-1, copper core pipe；2-2, flexible ring；3, cavity plate；4, type chamber；5, it pushes away
Head；5-1, inlet；5-2, medium intake line；5-3, polyurethane rings；6, punch-pin；7, bend pipe；8, nitrogen gas spring；9, it floats and presses
Expect block.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
As shown in Figures 1 to 7, on the basis of using existing filling liquid bending die, the present invention provides a kind of utilizations
The method that composite filled medium carries out pipe liquid filled press-bending, the manufacturing process include the following steps:
Step 1: sealing, positioning stage: first according to the length of 1 deformed region of pipe by a certain amount of composite filled medium 2
It is put into pipe 1；Then pipe 1 is placed on to 3 upper surface of cavity plate of bending die, when placement makes pipe 1 have composite filled medium 2
Part face mold cavity 4；Pipe 1 is got into the movement simultaneously of left and right push top 5 until composite filled medium 2 is held on 5 top of push top；Bending die
Floating pressing block on tool compresses pipe 1 in vertical direction；
Step 2: low pressure supports matched moulds stage: being filled with liquid by the inlet 5-1 in any push top 5 in left and right, make liquid
Enter pipe 1 via the medium intake line 5-2 being connected to 1 inner cavity of pipe；Liquid is pressurized to one by the booster outside push top 5
Constant-pressure P1And keeping pressure constant, punch-pin 6 slowly moves downwards until completing molding；
Step 3: the high pressure bulging stage: loading required pressure for punch-pin 6, booster, which is increased, is depressed into P2Make part (part
Referring to the tubing in forming process) bulging is in place；Booster pressure release after bulging several minutes, then 6 release of punch-pin, shapes at this time
The small curvature radius bend pipe 7 met the requirements；
Step 4；Discharging phase: in place, left and right push top 5 returns to 7 outside of bend pipe to 6 uplink of punch-pin；Removing bend pipe 7 will answer
It closes packing material to pour out, forming finishes.
From Figure 2 it can be seen that there are certain intervals between 1 inner wall of pipe and composite filled medium 2 after pipe 1 shapes, therefore hold
It easily pours out preferably, takes out composite filled medium, the horizontal width m of composite filled medium and the ratio of pipe outside diameter d for convenience
Example is between 0.12-0.3.
The bearing force of 5 pairs of composite filled media 2 of left and right push top is always maintained at constant in above step；Floating pressing block is perpendicular
Histogram to by pipe 1 compression be in order to prevent liquid from the two sides of pipe 1 reveal.
Preferably, step 2 mesolow supports matched moulds stage, P1Reference value obtained according to following methods:
Wherein, t --- pipe thickness；D --- pipe outer diameter；σs--- pipe yield strength；
Calculate 0≤P1≤60Mpa；
Preferably, P1≤P2≤300Mpa；
Preferably, the specific complex form of the composite filled medium 2 includes copper core pipe 2-1 and is wrapped in copper core pipe 2-1
Outer flexible ring 2-2, the material of flexible ring 2-2 can be polyurethane or rubber, and the setting of flexible ring 2-2 is in order to avoid closing
Accessory inner surface is forced out trace in mold process.Further, 2 outer diameter of composite filled medium is slightly less than the internal diameter of pipe 1, tool
Body, the unilateral gap of the composite filled medium and pipe is 0.5-3mm.
Preferably, the pipe 1 can be using stainless steel, high temperature alloy, aluminium alloy, titanium alloy and the plasticity such as nonmetallic
Good material；
Preferably, the liquid in above step can choose emulsion, and water, oil, resisting medium also may be selected as filling
The liquid medium of object；
Preferably, 5 end sleeves of the left and right push top are equipped with the polyurethane rings 5-3 of sealing, and the polyurethane rings 5-3 is with a left side
Pipe 1 is squeezed into right push top 5 together；In order to guarantee that sealing effect, the outer diameter of polyurethane rings 5-3 are greater than 1 internal diameter of pipe about 1-2 milli
Rice；In order to which polyurethane rings are not scratched by pipe, the front end of polyurethane rings 5-3 is additionally provided with chamfering；
Preferably, 6 two sides of punch-pin of bending die are equipped with vertical nitrogen bullet 8 in step 1；Each nitrogen gas spring is divided into
There is the floating pressing block 9 for compressing pipe 1.
Specific embodiment:
The present embodiment is using 1 raw material of pipe as stainless steel 304, for pipe outside diameter d=34mm, wall thickness t=1mm, according to upper
The filling liquid press shaping die that step carries out bend pipe 7 is stated, wherein the low pressure P in step 21=22Mpa, the closure pressing speed 2mm/ of punch-pin 6
s；Bulging pressure P in step 32=220Mpa, bulging time are 5 minutes；Available radius of curvature R b=0.88, straight wall section
Length is 15mm, t/d≤0.03, the bend pipe 7 that 90 degree of bending angle.
The present invention overcomes the corrugated problems of cross section distortion and part, and filled media and hydraulic while use can control very well
Part deformation behavior, 7 straight wall Duan Yuechang of bend pipe avoid part from locally wrinkling in straight wall section；Furthermore composite filled medium 2 is in pipe
The compression and tensile stress for receiving pipe 1 when being bent when 1 inside support are opposite to be reduced, and circumferential cross-section is in the curved inside of pipe 1
1 circumferential cross-section of pipe is prevented to become ellipse and all at random because part compression is offset in the presence of composite filled medium 2 by compression
Length shortens, the distance of shortening 1 bottom end of pipe to final type face；Feature bottom is reduced relatively by tensile stress when high pressure bulging, from
And reduce the deflection of 1 part of pipe.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of method for carrying out pipe liquid filled press-bending using composite filled medium, characterized by the following steps:
Step 1: sealing, positioning stage: a certain amount of composite filled medium being put into pipe according to the length of pipe deformed region first
Base；Then pipe is placed on to the cavity plate upper surface of bending die, when placement makes pipe have the part face mould of composite filled medium
Tool type chamber；Pipe is got into left and right push top while movement until composite filled medium is held on push top top；Floating binder on bending die
Block compresses pipe in vertical direction；
Step 2: low pressure support matched moulds stage: liquid is filled with by the inlet in any push top in left and right, make liquid via with pipe
The medium intake line of base inner cavity connection enters pipe；Liquid is pressurized to certain pressure P by the booster outside push top1And it keeps
Pressure is constant, and slowly movement molds punch-pin up to completing downwards；
Step 3: the high pressure bulging stage: for pressure needed for punch-pin load, booster, which is increased, is depressed into P2Make part bulging in place；It is swollen
Booster and punch-pin pressure release, shape the small curvature radius bend pipe met the requirements at this time after shape several minutes；
Step 4；Discharging phase: in place, left and right push top returns on the outside of bend pipe punch-pin uplink；Bend pipe is removed by composite filled material
Material is poured out, and forming finishes.
2. the method for carrying out pipe liquid filled press-bending using composite filled medium as described in claim 1, it is characterised in that: described
Step 2 mesolow supports matched moulds stage, P1Reference value obtained according to following methods:
Wherein, t --- pipe thickness；D --- pipe outer diameter；σs--- pipe yield strength.
3. a kind of method for carrying out pipe liquid filled press-bending using composite filled medium as claimed in claim 2, it is characterised in that:
0≤P1≤60Mpa。
4. the method for carrying out pipe liquid filled press-bending using composite filled medium as claimed in claim 3, it is characterised in that: P1≤
P2≤300Mpa。
5. the method for carrying out pipe liquid filled press-bending using composite filled medium as described in claim 1, it is characterised in that: described
The specific complex form of composite filled medium includes copper core pipe and the flexible ring that is wrapped in outside copper core pipe.
6. the method for carrying out pipe liquid filled press-bending using composite filled medium as claimed in claim 5, it is characterised in that: described
The unilateral gap of composite filled medium and pipe is 0.5-3mm.
7. the method for carrying out pipe liquid filled press-bending using composite filled medium as described in claim 1, it is characterised in that: described
End sleeve of having a haircut is equipped with the polyurethane rings of sealing, and the polyurethane rings outer diameter is 1-2mm bigger than pipe internal diameter.
8. the method for carrying out pipe liquid filled press-bending using composite filled medium as described in claim 1, it is characterised in that: bend
The punch-pin two sides of mold are equipped with vertical nitrogen gas spring；The floating pressing block is located at nitrogen gas spring lower end.
9. the method for carrying out pipe liquid filled press-bending using composite filled medium as described in claim 1, it is characterised in that: described
The horizontal width m of composite filled medium and the ratio of pipe outside diameter d are between 0.12-0.3.
10. the method for carrying out pipe liquid filled press-bending using composite filled medium as described in claim 1, it is characterised in that: institute
Stating pipe raw material is stainless steel 304, pipe outside diameter d=34mm, wall thickness t=1mm；Low pressure P1=22Mpa, the closure pressing speed of punch-pin
2mm/s；Bulging pressure P in step 32=220Mpa, bulging time are 5 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811156331.9A CN109158458B (en) | 2018-09-29 | 2018-09-29 | Method for performing liquid-filled bending on pipe by using composite filling medium |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811156331.9A CN109158458B (en) | 2018-09-29 | 2018-09-29 | Method for performing liquid-filled bending on pipe by using composite filling medium |
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| CN109158458A true CN109158458A (en) | 2019-01-08 |
| CN109158458B CN109158458B (en) | 2020-08-25 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110576088A (en) * | 2019-08-29 | 2019-12-17 | 四川航天长征装备制造有限公司 | bending forming method and bending device for large-diameter thin pipe |
| CN111112431A (en) * | 2019-12-20 | 2020-05-08 | 中国航发南方工业有限公司 | Method for liquid-filled extrusion forming and blade obtained thereby |
| CN111558645A (en) * | 2020-07-15 | 2020-08-21 | 天津天锻航空科技有限公司 | Method and device for forming part by conical rubber cylinder |
| CN112620467A (en) * | 2020-11-30 | 2021-04-09 | 南京航威智造科技有限公司 | Manufacturing method of ultra-thin-wall pipe fitting with small bending radius |
| WO2021077514A1 (en) * | 2019-10-25 | 2021-04-29 | 大连理工大学 | Large-size thin-wall ring housing inflation hot-bending forming device and method |
| CN113319150A (en) * | 2021-06-03 | 2021-08-31 | 哈尔滨工业大学 | Size correction method for elbow passing pipe fitting |
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| CN108435852A (en) * | 2018-06-13 | 2018-08-24 | 西北工业大学 | A kind of modularization pressure-adjustable Siphon Mandril |
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| JPH0938727A (en) * | 1995-07-31 | 1997-02-10 | Honda Motor Co Ltd | Method for bending tube body and holding member therefor |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110576088A (en) * | 2019-08-29 | 2019-12-17 | 四川航天长征装备制造有限公司 | bending forming method and bending device for large-diameter thin pipe |
| WO2021077514A1 (en) * | 2019-10-25 | 2021-04-29 | 大连理工大学 | Large-size thin-wall ring housing inflation hot-bending forming device and method |
| US11413672B2 (en) | 2019-10-25 | 2022-08-16 | Dalian University Of Technology | Apparatus and method for forming large-scale thin-walled ring shell by hot-press bending with internal gas pressure |
| CN111112431A (en) * | 2019-12-20 | 2020-05-08 | 中国航发南方工业有限公司 | Method for liquid-filled extrusion forming and blade obtained thereby |
| CN111558645A (en) * | 2020-07-15 | 2020-08-21 | 天津天锻航空科技有限公司 | Method and device for forming part by conical rubber cylinder |
| CN111558645B (en) * | 2020-07-15 | 2020-10-16 | 天津天锻航空科技有限公司 | Method and device for forming part by conical rubber cylinder |
| CN112620467A (en) * | 2020-11-30 | 2021-04-09 | 南京航威智造科技有限公司 | Manufacturing method of ultra-thin-wall pipe fitting with small bending radius |
| CN112620467B (en) * | 2020-11-30 | 2022-09-06 | 南京航威智造科技有限公司 | Method for manufacturing small-bending-radius ultra-thin-wall pipe fitting |
| CN113319150A (en) * | 2021-06-03 | 2021-08-31 | 哈尔滨工业大学 | Size correction method for elbow passing pipe fitting |
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