CN107186063B - Rolling-based integrated rib forming and bending forming method for integral panel ribs - Google Patents
Rolling-based integrated rib forming and bending forming method for integral panel ribs Download PDFInfo
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- CN107186063B CN107186063B CN201710471140.0A CN201710471140A CN107186063B CN 107186063 B CN107186063 B CN 107186063B CN 201710471140 A CN201710471140 A CN 201710471140A CN 107186063 B CN107186063 B CN 107186063B
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000005452 bending Methods 0.000 title claims abstract description 21
- 238000005096 rolling process Methods 0.000 title claims abstract description 20
- 239000000047 product Substances 0.000 claims description 16
- 238000003754 machining Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 239000013589 supplement Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 19
- 238000013000 roll bending Methods 0.000 abstract description 7
- 238000009826 distribution Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 238000005242 forging Methods 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000004080 punching Methods 0.000 description 6
- 238000007493 shaping process Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000003801 milling Methods 0.000 description 5
- 239000000945 filler Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910001094 6061 aluminium alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000219112 Cucumis Species 0.000 description 1
- 235000015510 Cucumis melo subsp melo Nutrition 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- FJJCIZWZNKZHII-UHFFFAOYSA-N [4,6-bis(cyanoamino)-1,3,5-triazin-2-yl]cyanamide Chemical compound N#CNC1=NC(NC#N)=NC(NC#N)=N1 FJJCIZWZNKZHII-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000010977 jade Substances 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005480 shot peening Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Forging (AREA)
Abstract
A kind of integral panel rib die mould and bending integral forming method based on roll-in, comprising the following steps: (1) blank figure is rolled according to integral panel product shape；(2) plate blank size is determined；(3) design and manufacture main roller wheel and auxiliary roller；(4) main roller wheel and auxiliary roller are mounted on special rolling mill；(5) plate blank is sent into from the input side of two counter-rotation main roller wheels, rolls and bring it about plastic deformation to plate blank progress sequence using the type groove in main roller wheel, obtains rib and pre-bending shape；Preformed blank is sent out from main roller wheel outlet side, carries out correction roll bending to blank using auxiliary roller；(6) subsequent school shape and finishing are completed.The present invention can shape plate blank compared under side crops industry, obtain the large scale integral panel shells part for having Varying-thickness geometrical characteristic with raised or sunken rib etc., production efficiency and stock utilization are high, and product streamline distribution is reasonable, mechanical property is good.
Description
Technical field
The invention belongs to metal forming field more particularly to a kind of integral panel rib die mould based on roll-in with it is curved
Bent integral forming method.
Background technique
Integral panel is to be widely used in being tied by the integration that the skeletons such as thick covering and stringer form for aerospace field
Structure, such as fuselage wallboard, Varying-thickness covering, propellant cabinet, bottom melon valve, truncated cone shape skirt section, transition siding, motor power room
Deng.Curved slab shells as a big type with the non-uniform thickness geometrical characteristic in part, integral panel have light-weight, intensity is high,
The advantages that rigidity is good, fatigue life is long, therefore become a kind of efficient configuration and raising that modern aerospace device generallys use
The important channel of opportunity of combat comprehensive performance.As the speed of contemporary aircraft is constantly promoted with load-carrying ability, to the comprehensive of integral panel
It is also higher and higher to close performance requirement, causes its geometry to become increasingly complex, manufacture difficulty greatly increases.So far, whole
The manufacturing method of siding mainly has machining, chemistry milling, welding, local loading and shaping and explosive forming etc..
Since integral panel general size is larger, and the distribution of shapes such as muscle, rib, on curved surface, conventional machining processes method is difficult
With application, mostly use CNC (computer numerical control (CNC)) processing to manufacture integral panel greatly at present.Such as a kind of Chinese patent " outer net
Lattice siding numerical control processing technology method " (CN106425297A) propose it is a kind of be first bent, recycle Large CNC machine tooling obtain
The method of integral panel.But it is very high to equipment requirement using CNC processing integral panel, especially process large-sized complicated product
Need the expensive multi-shaft interlocked lathe of large size；In addition, machining production efficiency, in terms of there is also very big
It is insufficient.For example, Boeing in the processing of certain siding, just eliminates 60%~70% raw material [the new tinkling of pieces of jade high-speed milling of fourth
Its 4 tank siding grid Aerospace manufacturing technology of Dare, 2008 (5): 64].
Chemistry milling is the protective strip coating that the surface coating of metal thick plate blank can be resisted to etchant solution effect,
Quarter shape is carried out after cured, then the protective coating of working position will be needed to peel off, then blank is immersed in chemical attack solution,
Corroded and removed a kind of processing method of corresponding position material to exposed surface.Chemistry milling can process aluminium, magnesium, titanium, nickel,
The various metals such as copper, steel and alloy and supersize workpiece, no matter and curve form is more complicated, how high material hardness is,
It can be processed, therefore become modern aerospace field and apply a kind of very extensive Special Working Technology.But chemistry milling
Environmental pollution is serious, processing efficiency and precision are low, and can only working width be greater than the groove of twice of depth, be unfavorable for loss of weight.
In addition, the defects of original scratch of blank, pit, can also reproduce on machined surface, even expand.
Chinese patent " a kind of method for fast mfg for tank grid siding outside aerospace craft "
(CN103639668A) a kind of grid rib for being welded in using heap and forming protrusion in plate plane is proposed, aerospace craft is obtained
Outer tank grid siding method.But the quality and production efficiency of welding forming are lower.
The production efficiency and stock utilization of metal forming are high, can also improve the mechanical property of product to a certain extent
Can, but the Thin-shell Part with Varying-thickness geometrical characteristic this kind of for integral panel, but it is difficult due to various straight
It connects and is processed using plastic forming process such as common punching press or forgings.For example, conventional ones are mainly for forming front and back slab
The case where thickness of material remains unchanged, and forging and molding is then mainly for the blank of the forms such as bar；Meanwhile large scale flat blank
Expect that horizontal projected area is very big during the monolithic molding of common punching press or forging etc. and can be continuously increased, will lead to greatly
Shaping load, common forging equipment and mold cannot be born.In addition, when whole punching press or forging and molding, the material at rib position
Stream is dynamic will be very difficult, and be difficult to realize accurately control.In view of this, proposing technique [the Li Feng of " local loading and shaping "
Special forming technology theory and the BJ University Press technology, 2011], i.e., using particular manufacturing craft to the given zone of slab blank
Domain applies load, makes the material of corresponding position that the plastic deformation of part occur, and operates, leads in the different zones of blank repeatedly
The deformation for crossing accumulation part obtains final product shape.The method can obtain ribbed housing component under lower forming force, but
Since deformation is the non-homogeneous and discrete complex process by multifactor impact, easily appearance filling is discontented, offset, streamline is rolled over
The defects of folded and deformation is uneven needs accurate control difference to apply the order of action between load tool, loading capacity and guarantees mutual
Harmony, practical application is limited.The deformation of explosive forming process manufacture integral panel is also difficult to control, and production efficiency is very
It is low, less use in practice.
It is subsequent also to be bent to if first processing to obtain rib shape to plate blank when integral panel produces
Shape.Bending method of integral panel, including the press-bending of roll bending, increment, age forming, contour peening and laser bending etc..Wherein,
Roll bending is using a kind of earliest and more technique, and high production efficiency, equipment are simple, method is flexible, suitable for mass production, but at
Rib is easily broken off, distorts or unstability when shape.It is proposed to this end that filler roll forming technique [Zhang Shihong, the Xiao of integral panel
It is cold, Liu Jingsong integral panel filler roll forming technical study forging technology, 2009,34 (2): 54-56], first by uniform thickness
Plate is processed to obtain muscle, rib using numerical control cutting, and filler is then added in a groove and carries out roll bending again, removes and fills out again after bending forming
Material.Filler roll bending can protect rib, improve forming accuracy, but complicated for operation, low efficiency.Increment press-bending is accumulation multi-pass
Whole bending is realized in local buckling, can be compared with obtaining large scale product under low load；Timeliness (or creep ageing) forming is benefit
With the creep properties of metal, a kind of manufacturing process of progress synchronous with timeliness will be shaped；Shot-peening is hit using High-velocity Projectiles stream
Sheet metal surface makes surface and its subsurface material generate a small amount of plastic deformation and extend, and occurs that plate to being sprayed
The bending deformation of face protrusion；Laser bending is realized and is bent by generated thermal stress using laser irradiation plate.It is all
There is the deficiencies of more process, long processing time, precision are difficult to ensure in these methods.
In short, the forming of existing a variety of materials and processing technology, manufacture integral panel it is this kind of it is ribbed have thicken
There are many deficiencies when spending the housing component of geometrical characteristic, is not able to satisfy the production requirement of numerous lightweight housing components.
Summary of the invention
To overcome the shortcomings of the prior art, the integral panel rib die mould that the present invention provides a kind of based on roll-in with
Bending integral forming method, comprising the following steps:
(1) the product geometry of the integral panel shaped needed for analysis increases technique according to the requirement of Plastic Forming and mends
It fills, pattern draft and machining allowance, obtains the roll-in blank figure of integral panel；
(2) according to the roll-in blank figure of integral panel and by the principle of plastic deformation constancy of volume, determine that integral panel is flat
The length and width and thickness of plate blank material；Due to the deformation characteristics of rolling formation process, the thickness of the plate blank is greater than whole
The thickness of siding blank, length and width are then less than the length and width size of integral panel blank；
(3) it according to the type groove of roll-in blank two main roller wheel working portions of G- Design, completes main roller wheel and assists roller
Processing；
(4) two main roller wheels and auxiliary roller are mounted on special rolling mill；
(5) special rolling mill is run, rolling formation is carried out to plate blank, obtains the rib shape with Varying-thickness geometrical characteristic
The integral panel blank of shape and curved shape；
During the rolling formation, plate blank is sent into from the input side of two counter-rotation main roller wheels first, benefit
Gradual plastic deformation is rolled and brought it about to what plate blank carried out sequence with the type groove in main roller wheel, obtains protrusion and recessed
Sunken rib shape, simultaneously because the above and below of plate blank has asymmetry in plastic deformation, plate blank passes through roller
Curved shape is formed after compressive strain；Preformed integral panel blank is sent out from the outlet side of main roller wheel, recycles help roll
Wheel carries out correction roll bending to integral panel blank.
(6) integral panel blank is corrected shape, completes the subsequent processing process of finishing and heat treatment, obtains meeting most
The integral panel product required eventually.
The invention has the following advantages: Plastic Forming can be being carried out to plate blank compared under side crops industry, band is obtained
Raised or sunken rib etc. has the housing component of the integral panel type of Varying-thickness geometrical characteristic, greatly reduces finishing cutting
Amount, can give full play to Plastic Forming production efficiency and the high advantage of stock utilization, and the streamline distribution of product material rationally,
Mechanical property is good.
Detailed description of the invention
The present invention is described further with reference to the accompanying drawings and examples.
Fig. 1 is that the present invention is based on the signals of the principle of the integral panel rib die mould of roll-in and bending integral forming method
Figure；
Fig. 2 is the side view before plate blank rolling formation of the invention；
Fig. 3 is the side view of integral panel roll-in and bending integral forming process of the invention；
Fig. 4 is the schematic diagram of the integral panel with latticed rib；
Fig. 5 is the load-time graph for the integral panel stamping die forming process that numerical simulation obtains；
Fig. 6 is the roll-in load-time graph for the integral panel rolling formation process that numerical simulation obtains.
In Fig. 1 to Fig. 6,
1-plate blank；2-main roller wheels；3-integral panels；4-auxiliary rollers；5-support frames
Specific embodiment
Embodiment is integral panel shown in Fig. 4, and length and width and thickness are respectively 1500mm, 1000mm and 5mm, is needed
The vee gutter depth for wanting the latticed rib of compression moulding is 3mm.The material of the integral panel is 6061 aluminium sheets, and density is
2.89g/mm2, Poisson's ratio v is 0.33, and Young's modulus E is 68900MPa, yield strength σsFor 65MPa.
If integral panel be formed according to common process for stamping, i.e., plate blank is carried out using stamping die whole
Body is suppressed to obtain product, and can calculating shaping load according to following empirical equation, [Wang Xiaopei edits Practical Punch Parts technical manual machine
Tool industry publishing house, 2013]:
F=K σs A
Wherein, K-stress status modulus in the present embodiment, can use K=4 for compacting state；A-blank is in horizontal plane
Projected area.
It is about 0.5 × 10 that shaping load, which can be calculated,6KN(5×104T), which has been more than current Plastic Forming industry
The pressure limit that most forging equipments are capable of providing.Numerical-Mode is carried out to the punching press pressing process using plasticity finite element method
It is quasi-, obtain forming " load-time " curve shown in fig. 5.As can be seen that punching press load increased dramatically in the later period, maximum value is super
Cross 3.5 × 106KN(3.5×105T).As it can be seen that using the common Forging Technology method such as punching press be difficult to complete integral panel at
Shape.
The step of using the integral panel rib die mould of the invention based on roll-in with bending integral forming, is as follows:
(1) analysis needed for forming integral panel product geometry, according to the characteristics of Plastic Forming with require, to entirety
Siding product increases technique supplement, machining allowance and pattern draft, obtains the roll-in blank figure of integral panel；
(2) integral panel plate blank is determined by the blank principle equal with product volume according to roll-in blank figure
Length and width and thickness.In the present embodiment, determine plate blank with a thickness of 7mm；
(3) it according to the type groove of roll-in blank two main roller wheel working portions of G- Design, completes main roller wheel and assists roller
Processing and manufacturing；
In the present embodiment, the diameter of two main roller wheels is 478mm, and assisting the diameter of roller is 100mm.
(4) two main roller wheels and auxiliary roller are mounted on special rolling mill；
(5) special rolling mill is run, rolling formation is carried out to plate blank, obtains the rib shape with Varying-thickness geometrical characteristic
The integral panel blank of shape and curved shape；
In the present embodiment, the rotational angular velocity of main roller wheel is 1.5rad/s.
During rolling formation, plate blank is sent into from the input side of two counter-rotation main roller wheels first, is utilized
Type groove in main roller wheel rolls and brings it about gradual plastic deformation to plate blank progress sequence, obtains local crowning and recessed
Sunken rib shape and curved shape；Then, preformed blank is sent out from the outlet side of main roller wheel, using auxiliary roller to whole
Body wall slab part carries out correction roll bending, is further ensured that the bending precision of blank.
(6) integral panel blank is corrected shape, and completes finishing in CNC machine, obtained meeting and finally require
Integral panel product.
Numerical simulation is carried out using rolling formation process of the plasticity finite element method to step (5), obtains band net shown in Fig. 6
Load-time graph of the integral panel rolling formation of lattice rib.As it can be seen that maximum shaping load is maintained at 1.8 × 104KN
(1.8×103T) hereinafter, this is the load range that Plastic Forming field devices are capable of providing.If may be used also using thermoforming
The load of deformation is further greatly lowered.
The present invention can carry out Plastic Forming to plate blank under lesser load, obtain with raised or sunken rib
Deng the product of the large scale integral panel type with Varying-thickness geometrical characteristic, not only productivity and stock utilization are high, but also
The cutting output of subsequent finishing is small, and since the streamline of product material is cut off less, while pressing process causes tissue more
It is close, therefore the mechanical property of gained integral panel product is much better than the resulting product of other methods.
Unspecified part of the present invention belongs to the common knowledge of those skilled in the art.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710471140.0A CN107186063B (en) | 2017-06-20 | 2017-06-20 | Rolling-based integrated rib forming and bending forming method for integral panel ribs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710471140.0A CN107186063B (en) | 2017-06-20 | 2017-06-20 | Rolling-based integrated rib forming and bending forming method for integral panel ribs |
Publications (2)
| Publication Number | Publication Date |
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| CN107186063A CN107186063A (en) | 2017-09-22 |
| CN107186063B true CN107186063B (en) | 2019-02-12 |
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| CN201710471140.0A Expired - Fee Related CN107186063B (en) | 2017-06-20 | 2017-06-20 | Rolling-based integrated rib forming and bending forming method for integral panel ribs |
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| CN109702429A (en) * | 2017-10-26 | 2019-05-03 | 沈阳黎明国际动力工业有限公司 | A kind of odd-shaped cross section cone segmental arc rolling processing process |
| CN108273904A (en) * | 2018-01-25 | 2018-07-13 | 重庆大学 | Non- uniform thickness thin shell piece progressive molding apparatus and method based on rotating mould |
| CN110508653B (en) * | 2019-07-19 | 2020-09-29 | 重庆大学 | A kind of roll forming method of rib plate |
| CN111136134B (en) * | 2020-01-03 | 2022-03-04 | 中国航空制造技术研究院 | Forming device and forming process for obtaining curved ribbed wallboard |
| CN113664039B (en) * | 2020-05-13 | 2024-01-02 | 上海飞机制造有限公司 | Forming method of metal plate component |
| CN113996705B (en) * | 2020-07-27 | 2024-02-23 | 苏州铭峰精密机械有限公司 | Bending forming structure and method for large arc belt reinforcing rib |
| CN112222208B (en) * | 2020-10-08 | 2021-11-30 | 太原科技大学 | Rolling forming method of complex high-rib sheet |
| CN112317537B (en) * | 2020-10-26 | 2022-03-29 | 太原科技大学 | Rolling forming process of complex high-rib sheet |
| CN115430751B (en) * | 2022-09-16 | 2025-11-18 | 北京航星机器制造有限公司 | Hot extrusion forming device |
| CN119870980B (en) * | 2025-02-26 | 2025-10-10 | 上海交通大学 | Progressive local forging and bending forming die and method for U-shaped connecting piece |
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| JPS63168228A (en) * | 1986-12-27 | 1988-07-12 | Otsuka:Kk | Bending processing machine |
| JPH0938741A (en) * | 1995-07-31 | 1997-02-10 | Ishikawajima Harima Heavy Ind Co Ltd | Manufacturing method of tank spherical surface |
| CN102974671A (en) * | 2012-11-28 | 2013-03-20 | 上海飞机制造有限公司 | Rolling forming method of metal plate component |
| CN104646475A (en) * | 2015-03-05 | 2015-05-27 | 吉林大学 | Multi-point forming method for whole aluminum alloy wall plate of aircraft |
| CN105598851A (en) * | 2015-12-24 | 2016-05-25 | 中国航空工业集团公司北京航空制造工程研究所 | Shot peen forming method realizing torsional deformation of high-rib integral panel |
| CN106077251A (en) * | 2016-06-27 | 2016-11-09 | 哈尔滨工业大学 | A kind of induced with laser free forming method and device of cross bar integral panel |
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2017
- 2017-06-20 CN CN201710471140.0A patent/CN107186063B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63168228A (en) * | 1986-12-27 | 1988-07-12 | Otsuka:Kk | Bending processing machine |
| JPH0938741A (en) * | 1995-07-31 | 1997-02-10 | Ishikawajima Harima Heavy Ind Co Ltd | Manufacturing method of tank spherical surface |
| CN102974671A (en) * | 2012-11-28 | 2013-03-20 | 上海飞机制造有限公司 | Rolling forming method of metal plate component |
| CN104646475A (en) * | 2015-03-05 | 2015-05-27 | 吉林大学 | Multi-point forming method for whole aluminum alloy wall plate of aircraft |
| CN105598851A (en) * | 2015-12-24 | 2016-05-25 | 中国航空工业集团公司北京航空制造工程研究所 | Shot peen forming method realizing torsional deformation of high-rib integral panel |
| CN106077251A (en) * | 2016-06-27 | 2016-11-09 | 哈尔滨工业大学 | A kind of induced with laser free forming method and device of cross bar integral panel |
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