CN104416334A - Double-open type hollow profile frame stretch bending forming method - Google Patents

Double-open type hollow profile frame stretch bending forming method Download PDF

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Publication number
CN104416334A
CN104416334A CN201310400125.9A CN201310400125A CN104416334A CN 104416334 A CN104416334 A CN 104416334A CN 201310400125 A CN201310400125 A CN 201310400125A CN 104416334 A CN104416334 A CN 104416334A
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CN
China
Prior art keywords
stretch
open type
wrap forming
type hollow
inserts
Prior art date
Application number
CN201310400125.9A
Other languages
Chinese (zh)
Other versions
CN104416334B (en
Inventor
尹萍
李旭东
高林
陆云鹏
史红杰
倪贵金
刘祥龙
张杰刚
Original Assignee
首都航天机械公司
中国运载火箭技术研究院
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 首都航天机械公司, 中国运载火箭技术研究院 filed Critical 首都航天机械公司
Priority to CN201310400125.9A priority Critical patent/CN104416334B/en
Publication of CN104416334A publication Critical patent/CN104416334A/en
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Publication of CN104416334B publication Critical patent/CN104416334B/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • 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
    • B21D7/00Bending rods, profiles, or tubes
    • B21D7/08Bending rods, profiles, or tubes by passing between rollers or through a curved die
    • B21D7/085Bending rods, profiles, or tubes by passing between rollers or through a curved die by passing through a curved die

Abstract

The invention belongs to the technical field of plastic processing, and particularly relates to a double-open type hollow profile frame stretch bending forming method. By successfully using a whole filler filling method for the first time, the deformation of a profile cross section is controlled, and the problem of filler falling is solved; the problems of profile twisting deforming and opening shrinkage caused by intermediate heat treatment are solved through an improved technological process. The stretching bending forming method has the main advantages that a frame is stretched and bent along a die, so that the distortion and twisting of the cross section are prevented, the tensile rigidity of components can be improved, the resilience is low, the residual stress is lower, the forming quality is higher, components with large relative bending radiuses can be controlled, the hand finish amount is small, and the production rate is high. A product processed and formed by using the method is formed and qualified for delivery, the assembly requirement is guaranteed, and a technology foundation is established for other subsequent products using profile stretching bending frames of the structure.

Description

Two open type hollow material frame stretch wrap forming method
Technical field
The invention belongs to Technology of Plastic Processing field, be specifically related to a kind of two open type hollow material frame stretch wrap forming method.
Background technology
As shown in Figure 1, in product, this constitutional detail adopted as illustrated combining structure form in the past, and by a T-shaped frame, two L-type frames combine.As shown in Figure 2, the main distinction of H section bar and other hollow material frame is, H section bar is two-way opened open form structure and there is a horizontal bar centre, and two-way structure of opening wide both increases great difficulty to links such as Deformation control when being shaped, reinforced fillings, brings unpredictability to part forming precision.Adopt two-way opened open form hollow material frame alternative combinations structural frames to have following advantage: both to ensure that the round and smooth smooth of interior moulding surface structure, for target aircraft provide larger in space, realize again structure loss of weight and be about about 5kg; Next decreases number of parts, frock quantity, shortens manufacturing cycle, has saved production cost; Also simplify assemble flow simultaneously, improve Standard precision.
Summary of the invention
The object of the present invention is to provide a kind of two open type hollow material frame stretch wrap forming method, employing adds inserts stretch wrap forming method and realizes two-way opened open form hollow material bending forming.
For achieving the above object, the technical solution used in the present invention is:
A kind of two open type hollow material frame stretch wrap forming method, comprises the steps:
Step one: be shaped and prepare
1.1 get section bar directly expects, and is sawn to woollen length;
1.2 check material surface, get rid of surperficial bump injury;
1.3 measure the every sized data in raw material cross section and record;
1.4 installations, adjustment shaping stretch bending mould, jaw;
Step 2: pre-stretch wrap forming
2.1 two-way dress inserts;
Woollen is installed by 2.2;
2.3 pre-bendings are shaped;
Step 3: heat treatment
Woollen after pre-bending is quenched, vertically to put, opening upwards;
Step 4: mend stretch wrap forming
Woollen after 4.1 pairs of quenchings corrects shape, and can enter stretch bending mould smoothly;
4.2 two-way dress inserts;
4.3 are coated with lubricating oil at the carcass of stretch bending mould and absorption surface part;
Woollen is installed by 4.4;
4.5 stretch wrap forming;
4.5.1 woollen bends into stretch bending mould;
4.5.2 the top board screw of stretch bending mould is tightened;
4.5.3 stretch wrap forming;
Step 5: finishing
5.1 rough lumber surpluses, each 400mm in two ends;
5.2 press the rear part of model profile finishing shaping;
5.3 cutting surpluses
5.3.1 line of cut is marked;
5.3.2 sawing surplus;
5.3.3 part is repaired.
Get section bar in described step 1.1 directly to expect for 2A12O.
In described step 2.1 filling process notably, do not stay gap between inserts, within the scope of the 100mm of two ends, do not fill inserts; Pretension 200kN, angle of bend 80 °, the in-built inserts of jaw.
In described step 4.2 filling process notably, do not stay gap between inserts, within the scope of the 100mm of two ends, do not fill inserts.
Stretch bending power 400kN in described step 4.5.3, each 50mm in tensile elongation amount two ends, two ends.
Hardening heat 500 ± 3 DEG C in described step 3, insulation 30min water-cooled.
Top board, the lower platen of described semicircle stretch bending mould are connected with carcass by screw.
Beneficial effect acquired by the present invention is:
The present invention determines the technological parameter being applicable to two open type hollow material frame and being shaped, and solves springback control problem, and successfully uses the method dosing integral-filled material to control section bar section deformation first, solves filler and to come off problem; Solve by improving technique flow process section bar torsional deformation that intermediate heat-treatment causes, problem that opening shrinks.Stretch wrap forming mainly has the following advantages: bent by stretch bending along mould, prevents distortion and the distortion of section, can improve the tension rigidity of part, resilience is little, and residual stress is lower, and forming quality is higher, can draw the part that relative bending radius is large, hand finish amount is few, and productivity ratio is high.The product shaping using the method to process is good for delivery, ensure that assembling needs, for other products follow-up use the stretch bending frame of this kind of structure to establish Process ba-sis.
Accompanying drawing explanation
Fig. 1 is H type combo box structural representation;
Fig. 2 is H type mount structure schematic diagram;
Fig. 3 is stretch bending process schematic;
Fig. 4 is stretch bending mode structure schematic diagram;
In figure: 1, top board; 2, lower platen; 3, inserts; 4, section bar; 5, carcass; 6, woollen; 7, jaw; 8, stretch bending mould.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The present invention mainly uses stretch wrap forming technique to realize the making of two open type hollow material frame parts.
The process of stretch bending as shown in Figure 3.Stretch wrap forming is exactly while woollen 6 is bending, in addition tangential pulling force, changes the stress state in woollen 6 section, reduces or substantially eliminate bending springback, thus improve the degree of accuracy of part.Woollen 6 is put into jaw 7 and is stepped up prestretching, is bent by the woollen 6 of prestretching along stretch bending mould 8, finally adds pulling force and makes its pad pasting.
Of the present invention pair of open type hollow material frame stretch wrap forming method comprises and specifically comprising the steps:
Step one: be shaped and prepare
1.1 get section bar directly expects (2A12O), and is sawn to woollen length;
1.2 check material surface, get rid of surperficial bump injury;
1.3 measure the every sized data in raw material cross section and record;
1.4 installations, adjustment shaping stretch bending mould 8, jaw 7.
Step 2: pre-stretch wrap forming
2.1 two-way dress inserts 3, in filling process notably, do not stay gap between inserts 3, do not fill inserts 3 within the scope of the 100mm of two ends; Pretension 200kN, angle of bend 80 °, the in-built inserts 3 of jaw 7;
Woollen 6 is installed by 2.2;
2.3 pre-bendings are shaped;
Step 3: heat treatment
Woollen 6 after pre-bending is quenched, vertically to put, opening upwards, temperature 500 ± 3 DEG C, insulation 30min water-cooled.
Step 4: mend stretch wrap forming
Woollen 6 after 4.1 pairs of quenchings corrects shape, and can enter stretch bending mould 8 smoothly;
4.2 two-way dress inserts 3, in filling process notably, do not stay gap between inserts 3, do not fill inserts 3 within the scope of the 100mm of two ends;
4.3 are coated with lubricating oil at the carcass 5 of stretch bending mould 8 with absorption surface part;
Woollen 6 is installed by 4.4;
4.5 stretch wrap forming;
4.5.1 woollen 6 bends into stretch bending mould 8;
4.5.2 top board 1 screw is tightened;
4.5.3 stretch wrap forming, stretch bending power 400kN, each 50mm in tensile elongation amount two ends, two ends.
Step 5: finishing
5.1 rough lumber surpluses, two ends are about 400mm respectively;
5.2 press the rear part of model profile finishing shaping;
5.3 cutting surpluses
5.3.1 line of cut is marked;
5.3.2 sawing surplus;
5.3.3 part is repaired.
As shown in Figure 4, the top board 1 of described semicircle stretch bending mould 8, lower platen 2 are connected with carcass 5 by screw.

Claims (7)

1. a two open type hollow material frame stretch wrap forming method, is characterized in that: comprise the steps:
Step one: be shaped and prepare
1.1 get section bar directly expects, and is sawn to woollen length;
1.2 check material surface, get rid of surperficial bump injury;
1.3 measure the every sized data in raw material cross section and record;
1.4 installations, adjustment shaping stretch bending mould (8), jaw (7);
Step 2: pre-stretch wrap forming
2.1 two-way dress inserts (3);
Woollen (6) is installed by 2.2;
2.3 pre-bendings are shaped;
Step 3: heat treatment
Woollen (6) after pre-bending is quenched, vertically to put, opening upwards;
Step 4: mend stretch wrap forming
Woollen (6) after 4.1 pairs of quenchings corrects shape, and can enter stretch bending mould (8) smoothly;
4.2 two-way dress inserts (3);
4.3 carcasses (5) in stretch bending mould (8) and absorption surface part are coated with lubricating oil;
Woollen (6) is installed by 4.4;
4.5 stretch wrap forming;
4.5.1 woollen (6) bends into stretch bending mould (8);
4.5.2 top board (1) screw of stretch bending mould (8) is tightened;
4.5.3 stretch wrap forming;
Step 5: finishing
5.1 rough lumber surpluses, each 400mm in two ends;
5.2 press the rear part of model profile finishing shaping;
5.3 cutting surpluses
5.3.1 line of cut is marked;
5.3.2 sawing surplus;
5.3.3 part is repaired.
2. according to claim 1 pair of open type hollow material frame stretch wrap forming method, is characterized in that: get section bar in described step 1.1 and directly expect for 2A12O.
3. according to claim 1 pair of open type hollow material frame stretch wrap forming method, is characterized in that: in described step 2.1 filling process notably, inserts does not stay gap between (3), does not fill inserts (3) within the scope of the 100mm of two ends; Pretension 200kN, angle of bend 80 °, jaw (7) in-built inserts (3).
4. according to claim 1 pair of open type hollow material frame stretch wrap forming method, is characterized in that: in described step 4.2 filling process notably, inserts does not stay gap between (3), does not fill inserts (3) within the scope of the 100mm of two ends.
5. according to claim 1 pair of open type hollow material frame stretch wrap forming method, is characterized in that: stretch bending power 400kN in described step 4.5.3, each 50mm in tensile elongation amount two ends, two ends.
6. according to claim 1 pair of open type hollow material frame stretch wrap forming method, is characterized in that: hardening heat 500 ± 3 DEG C in described step 3, insulation 30min water-cooled.
7. according to claim 1 pair of open type hollow material frame stretch wrap forming method, is characterized in that: top board (1), the lower platen (2) of described semicircle stretch bending mould (8) are connected with carcass (5) by screw.
CN201310400125.9A 2013-09-05 2013-09-05 Double open type hollow material frame stretch wrap forming methods CN104416334B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201310400125.9A CN104416334B (en) 2013-09-05 2013-09-05 Double open type hollow material frame stretch wrap forming methods

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CN104416334A true CN104416334A (en) 2015-03-18
CN104416334B CN104416334B (en) 2017-09-29

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104741421A (en) * 2015-03-05 2015-07-01 江西洪都航空工业集团有限责任公司 Machining method for forming Z-shaped profile of airplane through one-time stretch-bending
CN106670302A (en) * 2015-11-05 2017-05-17 首都航天机械公司 Stretching forming method for spherical long melon petal-shaped parts
CN107052109A (en) * 2017-05-03 2017-08-18 天津航天长征火箭制造有限公司 A kind of split stretch bending mold and application method for rocket frame of section bar

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002331326A (en) * 2001-03-08 2002-11-19 Nhk Spring Co Ltd Hollow stabilizer and its manufacturing method
CN1970185A (en) * 2006-12-05 2007-05-30 成都飞机工业(集团)有限责任公司 Bending and shaping method for hollow aluminum alloy extrusion section bar
CN102078893A (en) * 2010-11-15 2011-06-01 陕西飞机工业(集团)有限公司 S-shaped section molding process equipment
CN102218461A (en) * 2011-03-02 2011-10-19 北京北方车辆集团有限公司 Stretch-bending formation method of lower enclosing rib of rectangular hollow section gun turret

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002331326A (en) * 2001-03-08 2002-11-19 Nhk Spring Co Ltd Hollow stabilizer and its manufacturing method
CN1970185A (en) * 2006-12-05 2007-05-30 成都飞机工业(集团)有限责任公司 Bending and shaping method for hollow aluminum alloy extrusion section bar
CN102078893A (en) * 2010-11-15 2011-06-01 陕西飞机工业(集团)有限公司 S-shaped section molding process equipment
CN102218461A (en) * 2011-03-02 2011-10-19 北京北方车辆集团有限公司 Stretch-bending formation method of lower enclosing rib of rectangular hollow section gun turret

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一二二厂 二十二车间: "型材淬火二次拉弯", 《航空工艺技术》 *
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104741421A (en) * 2015-03-05 2015-07-01 江西洪都航空工业集团有限责任公司 Machining method for forming Z-shaped profile of airplane through one-time stretch-bending
CN106670302A (en) * 2015-11-05 2017-05-17 首都航天机械公司 Stretching forming method for spherical long melon petal-shaped parts
CN107052109A (en) * 2017-05-03 2017-08-18 天津航天长征火箭制造有限公司 A kind of split stretch bending mold and application method for rocket frame of section bar

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Address after: 100076 Beijing City, Fengtai District Nanyuan garrison Road No. 2

Co-patentee after: China Academy of Launch Vehicle Technology

Patentee after: Capital Aerospace Machinery Co., Ltd.

Address before: 100076 Beijing City, Fengtai District Nanyuan garrison Road No. 2

Co-patentee before: China Academy of Launch Vehicle Technology

Patentee before: Capital Aerospace Machinery Company