CN116713381A - Shot-peening pre-bending tool and method for ribbed wallboard - Google Patents
Shot-peening pre-bending tool and method for ribbed wallboard Download PDFInfo
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- CN116713381A CN116713381A CN202310764589.1A CN202310764589A CN116713381A CN 116713381 A CN116713381 A CN 116713381A CN 202310764589 A CN202310764589 A CN 202310764589A CN 116713381 A CN116713381 A CN 116713381A
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- Prior art keywords
- rib
- ribbed wallboard
- wallboard
- ribbed
- shot
- Prior art date
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- 238000005452 bending Methods 0.000 title claims abstract description 44
- 238000005480 shot peening Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000003825 pressing Methods 0.000 claims abstract description 30
- 230000004888 barrier function Effects 0.000 claims abstract description 9
- 238000005422 blasting Methods 0.000 abstract description 16
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical compound C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 239000002760 rocket fuel Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 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
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
- B21D31/06—Deforming sheet metal, tubes or profiles by sequential impacts, e.g. hammering, beating, peen forming
-
- 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
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/003—Positioning devices
-
- 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
- B21D53/00—Making other particular articles
- B21D53/92—Making other particular articles other parts for aircraft
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Load-Bearing And Curtain Walls (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The application relates to the technical field of shot blasting forming, in particular to a shot blasting forming pre-bending tool and method for a ribbed wallboard. The rib clamping device comprises a limiting barrier strip, a feeding force screw, a pressing plate, a skin jacking block and a rib clamping block, wherein the limiting barrier strip is positioned on a non-rib surface of a ribbed wallboard, the rib clamping block is matched with the skin jacking block to position a thin-wall rib, and the feeding force screw penetrates through the pressing plate to drive the pressing plate to extrude the rib clamping block. The shot-peening pre-bending tool and the shot-peening pre-bending method for the ribbed wallboard aim to solve the problem that the wallboard is low in forming precision due to poor stability of pre-bending deformation of the wallboard ribs.
Description
Technical Field
The application relates to the technical field of shot blasting forming, in particular to a shot blasting forming pre-bending tool and method for a ribbed wallboard.
Background
The shot blasting forming technology is a forming method which utilizes high-speed shot flow to impact the surface of a metal plate material, so that the impacted surface and the metal material below the impacted surface are plastically deformed and extended, and the plate material is gradually bent and deformed to be protruded towards the sprayed surface so as to achieve the required shape. The technology began in the early fifties of the twentieth century and developed with the widespread use of aircraft monolithic panel parts. The forming method is flexible and various, is very suitable for small-batch production, and is widely applied to the forming of the integral wall plates of wings, fuselages, carrier rocket fuel tanks and the like of an airplane because a special die and a press are not needed in the forming process. Shot peening is currently a major method of forming the integral panels of modern aircraft, particularly large aircraft.
Along with the technical development of shot-peening, pre-stress shot-peening is gradually promoted, and pre-stress shot-peening is a shot-peening method for forming elastic strain by applying a load to a part plate blank in advance by means of a pre-stress clamp before shot-peening and then shaping the part plate blank. Under the condition of the same shot strength and coverage rate, the forming limit of the prestressed shot blasting is 2-3 times of that of the free shot blasting, meanwhile, the prestressed shot blasting can also effectively control the additional bending deformation along the direction of the shot blasting route, and the technology can solve the shot blasting forming requirement of the complex-shape curvature part, so that the development of the shot blasting forming technology is further promoted.
With the improvement of the mobility, durability and fuel economy requirements of the novel advanced aircraft, the shape curvature of the integral ribbed wallboard is increasingly complex, and in addition, in order to balance the weight and strength relationship, the thickness/height value of the ribs becomes small, so that the ribs are extremely easy to destabilize in the shot peening pre-bending process, which brings greater challenges to the shot peening of the ribbed wallboard.
The implementation of the prestressing force influences the precision of the deformation of the part during the shot-peening process. For the large-curvature thin-wall wallboard, the rib is required to be prestressed to realize the elastic pre-bending of the whole wallboard, so that the shot-blasting forming requirement is met. When the existing large-curvature ribbed integral wallboard is pre-bent along the direction of ribs (particularly thin-wall ribs), the ribs are extremely easy to be unstable, buckling defects are caused, the rigidity of the integral wallboard is damaged, and parts can be scrapped under serious conditions.
Therefore, the inventor provides a shot-peening pre-bending tool and a shot-peening pre-bending method for the ribbed wallboard.
Disclosure of Invention
(1) Technical problem to be solved
The embodiment of the application provides a shot-peening pre-bending tool and method for a ribbed wallboard, which solve the technical problem of lower wallboard forming precision caused by poor stability of pre-bending deformation of the wallboard ribs.
(2) Technical proposal
The application provides a shot blasting forming pre-bending tool for a ribbed wallboard, which comprises a limiting baffle bar, a feeding force screw, a pressing plate, a skin jacking block and a rib clamping block, wherein the limiting baffle bar is positioned on a non-rib surface of the ribbed wallboard, the rib clamping block is matched with the skin jacking block to position a thin-wall rib, and the feeding force screw penetrates through the pressing plate to drive the pressing plate to squeeze the rib clamping block.
Further, the skin top block is of a hollow structure, the inner cavity of the skin top block is provided with a first wedge-shaped surface, and clamping grooves for positioning the thin-wall ribs are formed in the length direction.
Further, the included angle between the first wedge-shaped surface and the contact surface of the ribbed wallboard is 60-80 degrees.
Further, the end face of the skin top block, which is in contact with the ribbed wallboard, is a first curved surface.
Further, two rib clamping blocks are respectively located at two sides of the thin-wall rib and are inserted into the inner cavity of the skin jacking block, and each rib clamping block is provided with a second wedge-shaped surface matched with the first wedge-shaped surface.
Further, the two rib clamping blocks are symmetrically distributed.
Further, the included angle between the inner cavity wedge surface of the skin top block and the contact surface of the ribbed wallboard is 60-80 degrees.
Further, the end face of the rib clamping block, which is in contact with the ribbed wallboard, is a second curved surface.
Further, the first curved surface and the second curved surface have the same radius of curvature.
The second aspect of the application provides a pre-bending method of a shot-peening pre-bending tool using the ribbed wallboard, comprising the following steps:
the limiting barrier strips are attached to the non-rib surface of the ribbed wallboard, and the feeding force screw is inserted into the pressing plate to be in contact with the pressing plate;
when the pressing plate is contacted with the rib clamping blocks and the rib clamping blocks are contacted with the skin jacking blocks, continuing to move downwards until the rib clamping blocks are contacted with the skin of the ribbed wallboard;
as the feed force is transferred to the ribbed wallboard, the outer surface of the ribbed wallboard is convexly deformed in the feed direction of the feed force screw.
(3) Advantageous effects
In conclusion, the rib web plate rigid constraint is realized in the pre-bending process of the wall plate through the matching installation of the skin top block and the rib clamping block, so that the rib web plate rigid constraint structure is high in universality, low in processing cost and high in efficiency.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.
FIG. 1 is a schematic structural view of a shot-peening pre-bending tool with a ribbed wallboard provided by an embodiment of the application;
FIG. 2 is a left side view of a shot peening pre-bending tool with a ribbed wallboard provided by an embodiment of the application;
fig. 3 is a schematic structural view of a skin top block of a shot peening pre-bending tool with a reinforced wallboard according to an embodiment of the present application;
fig. 4 is a schematic structural view of a rib clamping block of a shot-peening pre-bending tool with a rib plate according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a pre-bending process of a shot-peening pre-bending tool with a ribbed wallboard according to an embodiment of the present application;
fig. 6 is an assembly schematic diagram of a skin top block and a rib clamping block in a pre-bending process of a shot-peening forming pre-bending tool with a rib wall plate according to an embodiment of the present application;
FIG. 7 is a schematic diagram of an assembly structure of a feed force screw platen of a shot forming pre-bending tool with a ribbed wallboard according to an embodiment of the present application;
fig. 8 is a schematic flow chart of a shot peening pre-bending method for a ribbed wallboard according to an embodiment of the present application.
In the figure:
1-limiting stop bars; 2-feeding force screw; 3-pressing plates; 4-a skin top block; 401-a clamping groove; 402-top block curved surface; 5-rib clamping blocks; 501-a clamp block curved surface; 100-ribbed wallboard.
Detailed Description
Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the embodiments described, but covers any modifications, substitutions and improvements in parts, components and connections without departing from the spirit of the application.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
In the description of the present application, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships conventionally put in place when the product of the present application is used, or the directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be construed as limiting the present application.
In the description of the present application, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed" and "mounted" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a shot-peening pre-bending tool for a ribbed wallboard, which is provided by the embodiment of the application, and as shown in fig. 1-4, the tool can comprise a limiting barrier strip 1, a feeding force screw 2, a pressing plate 3, a skin jacking block 4 and a rib clamping block 5, wherein the limiting barrier strip 1 is positioned on a non-rib surface of the ribbed wallboard 100, the rib clamping block 5 is matched with the skin jacking block 4 to position a thin-wall rib, and the feeding force screw 2 penetrates through the pressing plate 3 to drive the pressing plate 3 to squeeze the rib clamping block 5.
In the above embodiment, when prestressing is applied to the ribbed wallboard 100, the feed force screws 2 are inserted into the corresponding hole sites of the pressing plates 3, and the pressing plates 3 correspond to the wallboard rib positions. The feed force screw 2 is rotated using a spanner tool such that the feed force screw 2 is in contact with the platen 3. The pressing plate 3 is contacted with the rib clamping blocks 5, and the rib clamping blocks 5 continuously move downwards after being contacted with the skin jacking blocks 4 until the clamping block curved surfaces 501 of the rib clamping blocks 5 are contacted with the skin of the ribbed wallboard 100, and at the moment, the pressing plate 3 is contacted with the jacking block curved surfaces 402 of the skin jacking blocks 4. As the jackscrew feeding force is transmitted to the ribbed wallboard 100, the outer surface of the ribbed wallboard 100 is convexly deformed in the feeding direction of the feeding force screw 2.
As an alternative embodiment, as shown in fig. 3, the skin top block 4 is a hollow structure, the inner cavity of the skin top block has a first wedge-shaped surface, and a clamping groove 401 for positioning the thin-wall rib is formed along the length direction.
The end surface of the skin top block 4, which is in contact with the ribbed wallboard 100, is a first curved surface, the end surface of the rib clamping block 5, which is in contact with the ribbed wallboard 100, is a second curved surface, and the curvature radius of the first curved surface is the same as that of the second curved surface. Designing a pre-bending curvature radius R according to shot forming process parameters Y The curvature radius of the top block curved surface 402 is consistent with that of the clamping block curved surface 501, R Q ＝(70～90％)R Y 。
In order to prevent the rib from destabilizing during the shot forming pre-bending process of the ribbed wallboard 100, special requirements are required for the skin top block 4:
a) The material of the covering top block 4 is required to be aluminum alloy;
b) The included angle R1 between the inclined plane of the skin top block 4 and the contact surface of the part skin is 60-80 degrees;
c) Chamfering is needed to be carried out on the edges of the skin jacking blocks 4 so as to prevent damage to the ribbed wallboard 100;
d) The slotting height L of the skin jacking block 4 is larger than the rib height H, and L-H is more than or equal to 2mm and less than or equal to 5mm;
e) The slotting width W of the skin jacking block 4 is larger than the thickness T of the ribs, and L-H is more than or equal to 2mm and less than or equal to 3mm.
As shown in fig. 6, the included angle R2 between the inclined surface of the rib clip 5 and the contact surface of the pressing plate 4 is identical to R1. The rib web plate is provided with a rib clamping block 5 at two sides respectively, and the rib clamping blocks are mirror symmetrical along the central plane of the rib web plate. The distance D between the two decreases as the feed screw 2 moves in the direction of the panel skin until D is equal to the rib thickness T of the ribbed panel 100.
As shown in fig. 7, a limit hole of the feeding screw 2 is processed on each pressing plate 3, so that the feeding screw 2 is in good contact with the pressing plate 3 when rotating, and no relative movement occurs. The pressing plate 3 and the feeding force screw 2 are made of stainless steel.
Fig. 8 is a schematic flow chart of a shot forming pre-bending method for a ribbed wallboard according to an embodiment of the present application, and as shown in fig. 8, the method may include the following steps:
s100, attaching and placing the limiting barrier strips on the non-rib surface of the ribbed wallboard, and inserting the feeding force screw into the pressing plate to enable the feeding force screw to be in contact with the pressing plate.
And S200, when the pressing plate is contacted with the rib clamping block, the rib clamping block is contacted with the skin jacking block, and then continuously moves downwards until the rib clamping block is contacted with the skin of the ribbed wallboard.
S300, along with the transmission of the feeding force to the ribbed wallboard, the outer surface of the ribbed wallboard is convexly deformed in the feeding direction of the feeding force screw.
The shot-peening pre-bending method for the rib wallboard effectively solves the quality problems of instability and the like of the rib web of the wallboard, and therefore shot-peening forming precision and surface quality of parts are improved.
Example 1
Certain ribbed integral wallboard parts (the size is about 1800mm multiplied by 1300mm, the material brand is 7B04, the wallboard is a complex curved surface, the outward surface of the wallboard is convexly curved in the spreading direction, and the minimum curvature radius is 14.8 m), and the parts are designed by the method for carrying out prestress shot blasting forming, wherein the prestress shot blasting forming is carried out on the parts, and the prestress shot blasting forming is shown in the following table:
it should be understood that, in the present specification, each embodiment is described in an incremental manner, and the same or similar parts between the embodiments are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. The application is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known method techniques is omitted here for the sake of brevity.
The above is only an example of the present application and is not limited to the present application. Various modifications and alterations of this application will become apparent to those skilled in the art without departing from the scope of this application. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (10)
1. Shot-peening forming pre-bending tool for ribbed wallboard is characterized by comprising a limiting barrier strip (1), a feeding force screw (2), a pressing plate (3), a skin jacking block (4) and a rib clamping block (5), wherein the limiting barrier strip (1) is positioned on a non-rib surface of the ribbed wallboard (100), the rib clamping block (5) is matched with the skin jacking block (4) to position thin-wall ribs, and the feeding force screw (2) penetrates through the pressing plate (3) to drive the pressing plate (3) to extrude the rib clamping block (5).
2. The shot peening pre-bending tool for the ribbed wallboard according to claim 1, wherein the skin top block (4) is of a hollow structure, an inner cavity of the skin top block is provided with a first wedge-shaped surface, and a clamping groove (401) for positioning the thin-wall ribs is formed along the length direction.
3. The shot peening pre-bending tool as defined in claim 2, wherein the first wedge surface and the ribbed wallboard (100) contact surface have an included angle of 60 ° to 80 °.
4. The shot peening pre-bending tool of the ribbed wallboard according to claim 2, wherein the end surface of the skin top block (4) contacting the ribbed wallboard (100) is a first curved surface.
5. The shot peening pre-bending tool for the ribbed wallboard according to claim 2, wherein two rib clamping blocks (5) are respectively positioned at two sides of a thin-wall rib and are inserted into an inner cavity of the skin jacking block (4), and the rib clamping blocks (5) are provided with second wedge-shaped surfaces matched with the first wedge-shaped surfaces.
6. The shot peening pre-bending tool for the ribbed wallboard according to claim 5, wherein the two rib clamping blocks (5) are symmetrically distributed.
7. The shot peening pre-bending tooling for the ribbed wallboard according to claim 5, characterized in that the included angle between the inner cavity wedge surface of the skin top block (4) and the contact surface of the ribbed wallboard (100) is 60-80 degrees.
8. The shot peening pre-bending tool for ribbed wallboard according to claim 4, wherein the end surface of the rib clamping block (5) contacted with the ribbed wallboard (100) is a second curved surface.
9. The tooling for pre-bending the ribbed wallboard of claim 8, wherein the first curved surface has the same radius of curvature as the second curved surface.
10. A method of pre-bending using the shot-peening pre-bending tooling of the ribbed wallboard of any one of claims 1-9, the method comprising the steps of:
the limiting barrier strips are attached to the non-rib surface of the ribbed wallboard, and the feeding force screw is inserted into the pressing plate to be in contact with the pressing plate;
when the pressing plate is contacted with the rib clamping blocks and the rib clamping blocks are contacted with the skin jacking blocks, continuing to move downwards until the rib clamping blocks are contacted with the skin of the ribbed wallboard;
as the feed force is transferred to the ribbed wallboard, the outer surface of the ribbed wallboard is convexly deformed in the feed direction of the feed force screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310764589.1A CN116713381B (en) | 2023-06-27 | 2023-06-27 | Shot-peening pre-bending tool and method for ribbed wallboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310764589.1A CN116713381B (en) | 2023-06-27 | 2023-06-27 | Shot-peening pre-bending tool and method for ribbed wallboard |
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| Publication Number | Publication Date |
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| CN116713381A true CN116713381A (en) | 2023-09-08 |
| CN116713381B CN116713381B (en) | 2024-06-07 |
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| CN202310764589.1A Active CN116713381B (en) | 2023-06-27 | 2023-06-27 | Shot-peening pre-bending tool and method for ribbed wallboard |
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| JP2004130368A (en) * | 2002-10-11 | 2004-04-30 | Aikoku Alpha Corp | Method and apparatus for forming metal sheet |
| CN200970610Y (en) * | 2006-10-25 | 2007-11-07 | 中国航空工业第一集团公司北京航空制造工程研究所 | Clamp for preventing cross rib from cracking during forming of ribbed integral wall plate |
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| CN111715739A (en) * | 2020-06-24 | 2020-09-29 | 中国航空制造技术研究院 | Pre-bending tool for integral wall plate with ribs and shot blasting forming method |
| CN111716255A (en) * | 2020-06-24 | 2020-09-29 | 中国航空制造技术研究院 | Pre-bending tool for ribbed wallboard and shot blasting forming method |
| CN112719058A (en) * | 2020-12-02 | 2021-04-30 | 中国航空制造技术研究院 | Method for improving spanwise prestress of shot blasting forming of high-rib integral wallboard |
| CN216027326U (en) * | 2021-07-27 | 2022-03-15 | 中航西安飞机工业集团股份有限公司 | Supplementary preflex frock of type of falling T rib |
| CN216027464U (en) * | 2021-09-18 | 2022-03-15 | 中航西安飞机工业集团股份有限公司 | Tool for applying prestress to thickened area of chord-wise shot blasting forming of ribbed wallboard |
| CN115090750A (en) * | 2022-07-14 | 2022-09-23 | 中国航空制造技术研究院 | High-rib discontinuous wallboard shot blasting forming pre-bending tool and forming method using same |
| CN115635004A (en) * | 2022-11-07 | 2023-01-24 | 中国航空制造技术研究院 | Shot blasting forming method for saddle-shaped ribbed wallboard |
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