CN106670727A - Stretch-bending forming method of bi-directional web profile frame - Google Patents
Stretch-bending forming method of bi-directional web profile frame Download PDFInfo
- Publication number
- CN106670727A CN106670727A CN201510744694.4A CN201510744694A CN106670727A CN 106670727 A CN106670727 A CN 106670727A CN 201510744694 A CN201510744694 A CN 201510744694A CN 106670727 A CN106670727 A CN 106670727A
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- Prior art keywords
- woollen
- stretch
- jaw
- stretch bending
- forming method
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- B21D7/00—Bending rods, profiles, or tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B15/00—Self-propelled projectiles or missiles, e.g. rockets; Guided missiles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
The invention belongs to the technical field of plastic processing, and specifically discloses a stretch-bending forming method of a bi-directional web profile frame. A two-time stretch-bending forming technology is adopted; heat treatment is conducted through the quenching technology between the two times of stretch-bending to improve strength of materials; and meanwhile, a multi-point binding method is adopted in the heat treatment process, and the situation that forming precision of secondary stretch bending is affected due to excessive deformation of rough materials in the treatment process is further prevented. Furthermore, forming precision is further ensured by limiting the rebound rate parameter of a stretch-bending mould and the size of a notch. Final precision of a part is ensured by adoption of repeated correcting and manual aging.
Description
Technical field
The invention belongs to Technology of Plastic Processing field, and in particular to a kind of manufacturing process of section bar.
Background technology
CZ-5 fairing of launch vehicle, is the maximum series radome fairing of domestic design so far.Radome fairing is needed to meet general structure quality while general structure profile and loading demands are met, also, separates the requirement such as reliability and sound insulation, noise reduction, wave transparent.Compared with active service fairing of launch vehicle, appearance and size, version, dimensional tolerance all have a very large change.The two-way web abnormal shape frame of shell of column after the combination of CZ-5 radome fairings, the II-IV quadrants along radome fairing are divided into two lobes.
Stretch wrap forming technology refers to that in addition tangential pulling force makes woollen progressively paste tire to make it be configured to given shape woollen while bending.Basic craft course is that first woollen two ends are clamped in jaw, and then stretch benders two-arm applies tangential pulling force while rotating to woollen, makes woollen progressively paste tire and is finally configured to required form.
Two-way web frame of section bar, its radius of curvature R 2598.8mm, inner side web thickness and width are respectively 8mm, 54mm；Outboard web thickness and width are respectively 6mm, 36.5mm；Side plate width is 6mm, and whole profile height is 90mm, and material is extra super duralumin alloy 7A09-0 section bars.
This section bar is unsymmetric structure, and whole height is higher, and wall thickness is thicker, web width, and its outboard web is unfettered in free state all the time when shaping, and using this special profile structure, uncontrollable factor increases, and increases the shaping difficulty of part.Compared with other frame of section bar, the main feature of two-way web frame of section bar mainly includes：First, diameter is big (R2598.8)；2nd, section bar overall dimensions are big；3rd, section is complicated, two-way web, asymmetric；Inside and outside web is two kinds of curve forms when the 4th, bending, and, to receive side, outer web is to put side, and outboard web is unfettered in free state all the time for endosternum.Therefore 2 are easily tilted when its outboard web bends when part 1 shapes, as shown in figure 1, the side for tilting forms gap with the surface of platform 3, makes the baseplane of the part after shaping 1 larger with the gap of platform 3, affect part flatness and angle after shaping.Further, since the reason for resilience, the defects such as cross section distortion, radius increase can be produced during stretch bending.Therefore appropriate design forming technology and mould structure are needed, to produce the part of size qualification.
Common stretch wrap forming method is difficult to meet the shaping of the two-way web frame of section bar of CZ-5 fairing of launch vehicle, it is impossible to so that the element precision after shaping meets matching requirements.
The content of the invention
It is an object of the invention to provide a kind of two-way web frame of section bar stretch wrap forming method of 5m diameters, it can meet the forming requirements of the two-way web frame of section bar of CZ-5 fairing of launch vehicle.
Technical scheme is as follows：
A kind of two-way web frame of section bar stretch wrap forming method, the method comprises the steps：
1) prepare, comprise the steps
A. by woollen sawing, lower heat treatment test piece afterwards；
B. stretch bending mould is selected, it is desirable to rebound degree 0.8～1%, carcass depth of rebate dimensional tolerance -0.1mm～0, width dimensions 0.2～0.4mm of tolerance；
2) pre- stretch wrap forming
A. woollen surface is cleared up；
B. the two ends of above-mentioned woollen are installed using jaw, using stretch benders axial pretension is applied to woollen section, in the case where pretension is constant, apply moment of flexure so that woollen pastes tire, i.e., into stretch bending mould, be adjacent to mould tire；
C. discharging：Both sides hydraulic cylinder jaw is opened, woollen is unloaded from the jaw of both sides；
3) woollen after pre- stretch bending is heat-treated
A. woollen is taken out from stretch bending mould, is placed it on heat treatment frame, tied up using multiple spot；
B. the heat treatment frame and woollen after tying up is placed on together in the flame that temperature is 475 ± 5 DEG C, and the time is 30-35min, then water cooling；
4) stretch wrap forming is mended
A. the part for contacting with woollen in stretch bending mould applies lubricating oil；
B. the two ends of above-mentioned woollen are installed using jaw, using stretch benders axial pretension is applied to woollen section, in the case where pretension is constant, apply moment of flexure, woollen is all introduced into the groove of stretch bending mould, compress stretch bending die cap plate；
C. continue to apply pulling force to woollen, mend stretch bending and paste tire to woollen；
5) correct
A. surplus is slightly cut, by the termination of the woollen after stretch bending according to workpiece template cut lines, surplus is removed beyond 80～110mm of line of cut；
B. workpiece model amendment as requested, forms Forming Workpiece；
6) artificial aging
Carry out artificial aging reinforcing to part after shaping, concrete technology be Forming Workpiece is placed on into 160 ± 5 DEG C in the environment of be incubated 175～185 minutes；
Repeat the above steps 5), amendment is repeated, until part meets technological requirement.
In above-mentioned two-way web frame of section bar stretch wrap forming method：There is bump injury for woollen surface, then carried out surface defect process before pre- stretch wrap forming step, woollen is polished smooth.
In above-mentioned two-way web frame of section bar stretch wrap forming method：Step 3) in woollen is tied up, to have certain gap between woollen, at intervals of 30～50mm, tie up elastic consistent.
In above-mentioned two-way web frame of section bar stretch wrap forming method：Described part meets technological requirement and refers to,
Part outer rim and tangent plane model 0～1.5mm of gap；
Cross section angle and 0～1.0mm of square gap；
Part and 0～1.5mm of platform gap.
In above-mentioned two-way web frame of section bar stretch wrap forming method：Step 2) and 4) in the two ends of woollen when being installed using jaw, the center line of jaw chuck will overlap with the section center of gravity of woollen.
The present invention remarkable result be：Using stretch wrap forming technique twice, it is heat-treated using quenching technical between stretch bending twice, reinforcement material intensity, while bundling mode using multiple spot in heat treatment process, further prevents woollen from deforming in processing procedure excessive, is affected secondary stretch wrap forming precision.Further, by the rebound degree parameter and notch size of restriction stretch bending mould, it is further ensured that forming accuracy.
Using repeatedly amendment and artificial aging, it is ensured that last element precision.
Description of the drawings
Schematic diagram is easily tilted when Fig. 1 bends for web；
Fig. 2 is part outer rim and tangent plane model gap schematic diagram；
Fig. 3 is cross section angle and square gap schematic diagram；
In figure：1. part；2. tilt；3. platform；4. model.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described in further detail to the present invention.
1) shaping prepares
A. woollen, sawing, afterwards lower heat treatment test piece are adopted.
B. stretch bending mould rebound degree 0.8～1%
Carcass depth of rebate dimensional tolerance -0.1mm～0, width dimensions 0.2～0.4mm of tolerance；
C. the center line of jaw chuck is overlapped with the section center of gravity of woollen, in case woollen and chuck are all subject to harmful additional bending moment during stretch bending.
2) surface defect is processed
Without the need for this step if woollen surface is smooth, pre- stretch wrap forming step is directly entered；
For the bump injury on woollen surface, needs are carried out polishing smooth and enter back into pre- stretch wrap forming step.
3) pre- stretch wrap forming
A. woollen surface is cleared up；
B. the two ends of above-mentioned woollen are installed using jaw, using stretch benders axial pretension is applied to woollen section, in the case where pretension is constant, apply moment of flexure so that woollen pastes tire, i.e., into stretch bending mould, be adjacent to mould tire；
C. discharging：Both sides hydraulic cylinder jaw is opened, woollen is unloaded from the jaw of both sides.
4) woollen after pre- stretch bending is heat-treated
A. woollen is taken out from stretch bending mould, is placed it on heat treatment frame, tied up using multiple spot；
There is certain gap between woollen, at intervals of 30～50mm, tie up elastic consistent, prevent woollen deformation excessive.Heat treatment frame can be welded using channel-section steel, the support body for intersecting anyhow be formed, for quenching technical.
B. the heat treatment frame and woollen after tying up is placed on together in the air furnace that temperature is 475 ± 5 DEG C, and the time is 30-35min, then water cooling.
5) stretch wrap forming is mended
A. the part for contacting with woollen in stretch bending mould applies lubricating oil
B. the two ends of above-mentioned woollen are installed using jaw, using stretch benders axial pretension is applied to woollen section, in the case where pretension is constant, apply moment of flexure, woollen is all introduced into the groove of stretch bending mould, compress stretch bending die cap plate；
Because woollen can produce deformation after quenching, therefore it is re-introduced into stretch bending mould and may produces difficulty, it is possible to use instrument auxiliary woollen is fully entered in stretch bending mould,
C. continue to apply pulling force to woollen, mend stretch bending and paste tire to woollen；
6) correct
A. surplus is slightly cut, by the termination of the woollen after stretch bending according to workpiece template cut lines, surplus is removed beyond 80～110mm of line of cut；
B. workpiece model amendment as requested, forms Forming Workpiece
7) artificial aging
Carry out artificial aging reinforcing to part after shaping, concrete technology be Forming Workpiece is placed on into 160 ± 5 DEG C in the environment of be incubated 175～185 minutes, carry out air cooling.
8) repeat the above steps 6), amendment is repeated
Require until part meets " metal plate punching part general technical specifications "：I.e.
By tangent plane model finishing part type face, the outer rim of part 1 is 0～1.5mm with the gap h of tangent plane model 4, as shown in Figure 2；
Part angle, cross section angle and square gap h are repaired by angle square1For 0～1.0mm,
Finishing part and platform gap, with platform gap h2For 0～1.5mm, as shown in Figure 3.
Claims (5)
1. a kind of two-way web frame of section bar stretch wrap forming method, it is characterised in that the method comprises the steps：
1) prepare, comprise the steps
A. by woollen sawing, lower heat treatment test piece afterwards；
B. stretch bending mould is selected, it is desirable to which rebound degree 0.8～1%, carcass depth of rebate dimensional tolerance -0.1mm～0 is wide
Degree 0.2～0.4mm of dimensional tolerance；
2) pre- stretch wrap forming
A. woollen surface is cleared up；
B. the two ends of above-mentioned woollen are installed using jaw, using stretch benders axial prestretching is applied to woollen section
Power, in the case where pretension is constant, applies moment of flexure so that woollen pastes tire, i.e., into stretch bending mould, patch
Tight mould tire；
C. discharging：Both sides hydraulic cylinder jaw is opened, woollen is unloaded from the jaw of both sides；
3) woollen after pre- stretch bending is heat-treated
A. woollen is taken out from stretch bending mould, is placed it on heat treatment frame, tied up using multiple spot；
B. the heat treatment frame and woollen after tying up is placed on together in the flame that temperature is 475 ± 5 DEG C, the time
For 30-35min, then water cooling；
4) stretch wrap forming is mended
A. the part for contacting with woollen in stretch bending mould applies lubricating oil；
B. the two ends of above-mentioned woollen are installed using jaw, using stretch benders axial prestretching is applied to woollen section
Power, in the case where pretension is constant, applies moment of flexure, woollen is all introduced into the groove of stretch bending mould,
Compress stretch bending die cap plate；
C. continue to apply pulling force to woollen, mend stretch bending and paste tire to woollen；
5) correct
A. surplus is slightly cut, by the termination of the woollen after stretch bending according to workpiece template cut lines, away from line of cut
Surplus is removed beyond 80～110mm；
B. workpiece model amendment as requested, forms Forming Workpiece；
6) artificial aging
Artificial aging reinforcing is carried out to part after shaping, concrete technology is that Forming Workpiece is placed on into 160 ± 5 DEG C
175～185 minutes are incubated under environment；
Repeat the above steps 5), amendment is repeated, until part meets technological requirement.
2. two-way web frame of section bar stretch wrap forming method as claimed in claim 1, it is characterised in that：For
There is bump injury on woollen surface, then carried out surface defect process before pre- stretch wrap forming step, and woollen is polished
It is smooth.
3. two-way web frame of section bar stretch wrap forming method as claimed in claim 1, it is characterised in that：Step
3) woollen is tied up in, there is certain gap between woollen, at intervals of 30～50mm, tie up elastic one
Cause.
4. two-way web frame of section bar stretch wrap forming method as claimed in claim 1, it is characterised in that：It is described
Part meet technological requirement and refer to,
Part outer rim and tangent plane model 0～1.5mm of gap；
Cross section angle and 0～1.0mm of square gap；
Part and 0～1.5mm of platform gap.
5. two-way web frame of section bar stretch wrap forming method as claimed in claim 1, it is characterised in that：Step
And 4) 2) when the two ends of woollen are installed using jaw in, the center line of jaw chuck will be with the section weight of woollen
The heart overlaps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510744694.4A CN106670727A (en) | 2015-11-05 | 2015-11-05 | Stretch-bending forming method of bi-directional web profile frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510744694.4A CN106670727A (en) | 2015-11-05 | 2015-11-05 | Stretch-bending forming method of bi-directional web profile frame |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106670727A true CN106670727A (en) | 2017-05-17 |
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ID=58857674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510744694.4A Pending CN106670727A (en) | 2015-11-05 | 2015-11-05 | Stretch-bending forming method of bi-directional web profile frame |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112605184A (en) * | 2020-11-27 | 2021-04-06 | 四川航天长征装备制造有限公司 | Forming method of spaceflight cone frame |
| CN112620495A (en) * | 2020-12-01 | 2021-04-09 | 四川航天长征装备制造有限公司 | Aerospace section bar frame sizing device |
| CN112756432A (en) * | 2020-12-24 | 2021-05-07 | 中航贵州飞机有限责任公司 | Numerical control stretch bending process method for channel-shaped part |
| WO2024093248A1 (en) * | 2022-10-31 | 2024-05-10 | 天津航天长征火箭制造有限公司 | Roll-bending forming method for hollow inequilateral profile frame |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5094096A (en) * | 1989-06-14 | 1992-03-10 | Chromcraft Furniture Corp. | Method of bending |
| CN101518802A (en) * | 2008-02-25 | 2009-09-02 | 西北工业大学 | Stretch-bending forming die and forming method |
| CN101870248A (en) * | 2009-04-21 | 2010-10-27 | 浙江胜华波电器股份有限公司 | Vehicle skylight frame and manufacturing method thereof |
| CN102389915A (en) * | 2011-09-26 | 2012-03-28 | 江苏奔宇车身制造有限公司 | Bend forming method for symmetrical framework section bars of cab of large-sized construction machine |
| CN104138944A (en) * | 2014-08-07 | 2014-11-12 | 天津航天长征火箭制造有限公司 | Stretch bending forming process for large-angle counter-drawing sectional material frame |
-
2015
- 2015-11-05 CN CN201510744694.4A patent/CN106670727A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5094096A (en) * | 1989-06-14 | 1992-03-10 | Chromcraft Furniture Corp. | Method of bending |
| CN101518802A (en) * | 2008-02-25 | 2009-09-02 | 西北工业大学 | Stretch-bending forming die and forming method |
| CN101870248A (en) * | 2009-04-21 | 2010-10-27 | 浙江胜华波电器股份有限公司 | Vehicle skylight frame and manufacturing method thereof |
| CN102389915A (en) * | 2011-09-26 | 2012-03-28 | 江苏奔宇车身制造有限公司 | Bend forming method for symmetrical framework section bars of cab of large-sized construction machine |
| CN104138944A (en) * | 2014-08-07 | 2014-11-12 | 天津航天长征火箭制造有限公司 | Stretch bending forming process for large-angle counter-drawing sectional material frame |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112605184A (en) * | 2020-11-27 | 2021-04-06 | 四川航天长征装备制造有限公司 | Forming method of spaceflight cone frame |
| CN112620495A (en) * | 2020-12-01 | 2021-04-09 | 四川航天长征装备制造有限公司 | Aerospace section bar frame sizing device |
| CN112756432A (en) * | 2020-12-24 | 2021-05-07 | 中航贵州飞机有限责任公司 | Numerical control stretch bending process method for channel-shaped part |
| CN112756432B (en) * | 2020-12-24 | 2023-05-23 | 中航贵州飞机有限责任公司 | Numerical control stretch bending process method for groove-shaped piece |
| WO2024093248A1 (en) * | 2022-10-31 | 2024-05-10 | 天津航天长征火箭制造有限公司 | Roll-bending forming method for hollow inequilateral profile frame |
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Application publication date: 20170517 |