CN207547357U - For being molded the composite tooling of male bend side ribbed part - Google Patents
For being molded the composite tooling of male bend side ribbed part Download PDFInfo
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- CN207547357U CN207547357U CN201721280639.5U CN201721280639U CN207547357U CN 207547357 U CN207547357 U CN 207547357U CN 201721280639 U CN201721280639 U CN 201721280639U CN 207547357 U CN207547357 U CN 207547357U
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- forming
- curved edge
- composite tooling
- edge rib
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- 239000002131 composite material Substances 0.000 title claims abstract description 30
- 238000003825 pressing Methods 0.000 claims abstract description 11
- 125000006850 spacer group Chemical group 0.000 claims description 25
- 238000005520 cutting process Methods 0.000 claims description 16
- 150000001875 compounds Chemical class 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 6
- 239000011324 bead Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 abstract 5
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 21
- 239000000463 material Substances 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000003490 calendering Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 238000009966 trimming Methods 0.000 description 3
- 239000002775 capsule Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000922 High-strength low-alloy steel Inorganic materials 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The utility model is related to a kind of for being molded the composite tooling of male bend side ribbed part, rubber pocket hydro-forming is used for, the composite tooling to include：Pedestal (1)；It is arranged in the punch-pin mould tire (3) of shape of on pedestal (1) and the side with male bend side；Be arranged on pedestal (1), positioned at the male bend side side of the punch-pin mould tire (3) and with the punch-pin mould tire (3) be spaced a spacing (D) side pressing block (2)；And adjust the regulating device of the spacing (D) between the punch-pin mould tire (3) and the side pressing block (2).The composite tooling for being used to be molded male bend side ribbed part can match various sizes of workpiece in a simple manner.
Description
Technical Field
The utility model relates to a compound frock for shaping convex curved edge rib spare, it is used for rubber bag hydraulic forming.
Background
The sheet metal parts are the main components of aerospace, and account for more than 60% of the total weight of the aircraft structural parts. In order to prolong the service life of the airplane, the airplane sheet metal part is required to have higher forming precision, and manual repair of the out-of-tolerance part is forbidden, so that the airplane sheet metal forming process develops towards 'net shape' without correction, and enters the precision forming stage of the airplane sheet metal part. At present, the main forming process and precision control of the plane sheet metal parts mostly stay at the stage of sample plate and manual searching, the traditional forming methods such as stretch forming, brake pressing and drop forming are poor in forming precision and cannot meet the requirements, and other more advanced forming technologies are urgently needed to replace the traditional forming methods. The emergence of the rubber bag hydraulic forming technology makes the manufacture of the complex sheet metal part of the airplane possible by replacing the drop-and-press forming step by step through the hydraulic forming of the rubber bag. At present, the rubber bag hydraulic forming is an important forming method for improving the forming quality of sheet metal parts in modern aircraft production. The application of the rubber bag hydraulic forming technology to the aerospace manufacturing field can greatly improve the strength of the aircraft body, reduce the weight of the aircraft and promote the development of the aerospace manufacturing technology in China.
In particular, the hydraulic forming of the rubber bag has the following advantages:
the hydraulic forming of the rubber bag is a static pressure forming process, the rubber bag is always tightly attached to the part in the forming process, the surface of the part is not scratched, the damage rate in the material is greatly reduced, and the fatigue strength of the part is high. Under the action of high pressure and friction force, the plasticity of the material can be fully exerted, the rebound quantity of the part is small, and the die attaching accuracy is high.
Only one rigid half die is used during forming, so that the die is simplified, the gap repair workload of a male die and a female die is saved, the preparation time of a press is short, the time is reduced by more than 50% even if the die is tested and formed, and the production period is short.
Because a plurality of moulds can be placed on the workbench at the same time, a plurality of parts of different types can be molded simultaneously in one cycle, and the production efficiency is high. The same die set can be used for forming plates of different materials and different thicknesses, and products formed by more than two working procedures can also be formed by the same die. The rubber pressure is uniform in the molding process, no stress is concentrated, the mold is in a three-dimensional pressed state, and the requirement on the mold material is not high. Therefore, the cost of the die can be reduced by about 80% compared with the die used normally.
Complex-shaped parts, such as non-axisymmetric parts, beveled bottom parts, beveled flange parts and convex-concave parts, can be formed and simultaneously the work of sagging and trimming can be performed. The process method of blanking, bending and deep drawing of the rigid die can be partially replaced.
Is suitable for forming materials with poor forming performance or high strength, such as aluminum alloy, magnesium alloy, titanium alloy, stainless steel and high-strength low-alloy steel, and can also form composite materials, which is very helpful for reducing the weight of parts.
As mentioned above, the rubber bag hydraulic forming method can be used for forming parts with complicated shapes, can reduce the times of forming procedures, reduce or simplify dies, shorten the production preparation period and improve the surface quality of the parts, thereby better solving the contradiction among the rigidity, the strength, the size and the precision of the parts, and simultaneously, the rubber bag hydraulic forming method is a processing method with low noise, low energy consumption and less pollution. The parts formed by the hydraulic process of the rubber bag can be directly used for assembly without trimming or slightly trimming, and are very suitable for medium and small batch production and trial production.
Because of this, the hydraulic forming process of rubber bladders has many unique advantages over conventional press forming, and has become an important forming method for manufacturing frame and rib parts in aviation factories.
However, the main defect of the large-curvature convex flanging part rubber bag hydraulic forming is the wrinkling of the flange part, and the common method for controlling the wrinkling is to adopt a side pressing block.
The anti-wrinkling principle of the side pressure blocks is similar to the anti-inner-wrinkling principle of the calendering forming with the blank holder, and the blank holder generates friction resistance to increase the radial tensile stress of the material so as to reduce the tangential pressure stress and prevent wrinkling. However, when the side pressure blocks are formed, a large gap is formed between the compression mold and the side pressure blocks, most of the material in the deformation area is suspended, the instability resistance of the suspended material is poor, the deformation area is similar to the calendering forming of the large gap, and the deformation area is more prone to wrinkling compared with the calendering forming with reasonable gaps. Therefore, the crease resistance of the side pressure blocks is far more complicated than the internal crease resistance of the blank holders during the calendering. Meanwhile, because the plate has the lap edges on the side pressure blocks, when the lap edges of the plate on the side pressure blocks are too much, the friction force borne by the plate is too large, and the plate is in danger of tensile fracture. Therefore, when the side pressure blocks are formed, the sheet has two defects of wrinkling and tension cracking.
In summary, there is an urgent need to further improve the hydraulic forming technique of rubber capsules using side press blocks.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a compound frock for shaping protruding crimp ribbed spare, it is used for the rubber bag hydraulic forming, and this a compound frock for shaping protruding crimp ribbed spare can match not unidimensional work piece with simple mode.
This purpose is realized through a compound frock that is used for shaping convex-curved limit rib spare, and it is used for rubber bag hydraulic forming, wherein, compound frock includes:
-a base;
-a male mould arranged on the base and having on one side a shape of a convex bead;
-a side press block arranged on the base on the side of the convex curved edge of the male mould blank and spaced from the male mould blank by a distance; and
-adjusting means for adjusting the distance between the punch mould and the side block.
When treating at least one size of fashioned work piece and change or when its turn-ups height changes, according to the utility model discloses a compound frock for shaping protruding crimp rib can match with the size of treating fashioned work piece with simple mode, and need not to make corresponding dedicated terrace die mould child and rather than the side briquetting that the cooperation was used for it.
In an advantageous embodiment, the adjusting device comprises:
-a positioning mechanism to determine the position of the male mould blank on the base;
-at least one shim arranged on the side of the male mould tyre opposite to the side of the convex curve;
-fastening means for fixing said at least one shim on the side of said male mould tyre opposite to the side of said convex curve.
In an advantageous embodiment, the positioning means comprise a positioning pin and a plurality of positioning holes.
In an advantageous embodiment, the positioning means comprise a projection and a plurality of detents.
In an advantageous embodiment, the positioning means comprise a tongue and groove connection.
In an advantageous embodiment, the positioning means comprise corresponding snap connections provided on the outer circumferential surfaces of the male mould and the base.
In an advantageous embodiment, the projection is formed on the male mould, the projection being pressed into a catch in the base.
In an advantageous embodiment, the positioning hole is a kidney-shaped hole.
In an advantageous embodiment, the positioning hole is a plurality of holes positioned in order from the convex bending side to the opposite side of the convex bending side.
In an advantageous embodiment, the positioning pins are separate components, which pass through positioning holes in the base and the male mould.
In an advantageous embodiment, the male mould is arranged directly on the base.
In an advantageous embodiment, a blade structure and a spacer are also arranged between the punch mould and the base.
In an advantageous embodiment, the blade structure is connected to the spacer on the side thereof having the cutting edge and to the punch mold on the side opposite to the side having the cutting edge.
In an advantageous embodiment, the spacer, the blade arrangement and the male mould blank are fixed to each other by fastening means.
In an advantageous embodiment, the blade arrangement is dimensioned such that its cutting edge is aligned with the outer side of the punch mould at least on the side having the convex curved edge configuration.
In an advantageous embodiment, the spacer is dimensioned such that the edge portion of the blade structure is not covered by the spacer.
In an advantageous embodiment, the blade structure is a detachable structure.
In an advantageous embodiment, the fastening means comprise a pin connection and/or a screw connection.
In an advantageous embodiment, the threaded connection is a bolt.
Drawings
The present invention will be described in detail with reference to the accompanying drawings. Wherein,
fig. 1 shows a front view of a composite tool for forming a convexly curved rib according to the invention with a lateral pressure block;
fig. 2 shows an enlarged partial cross-sectional view of a composite tooling for forming a convexly curved rib with a side press block according to an embodiment of the present invention;
fig. 3 shows a cross-sectional view of a composite tool for forming convexly curved rib-shaped elements with a side press block according to another embodiment of the present invention;
fig. 4 shows a detail of fig. 3.
Detailed Description
The technical solutions in the preferred embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, but the described embodiments are only preferred embodiments of the present invention. Based on the preferred embodiments of the present invention, all other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention.
Fig. 1 shows a front view of a composite tool for forming ribs with convex curved edges according to the invention, fig. 2 shows a partially enlarged sectional view of a composite tool for forming ribs with convex curved edges according to the invention, wherein the composite tool is used in rubber bladder hydraulic forming technology, a male die blank 3 is arranged on a base 1, a workpiece 10 to be formed is placed on the upper surface of the male die blank 3, the side pressing blank 2 is fixed on the base 1 at an interval with the male die blank 3, the distance between the male die blank 3 and the side pressing blank 2 is d, one side of the side pressing blank facing the male die blank 3 is arranged to be an inclined plane, the inclined plane forms an angle α with the bottom surface of the side pressing blank, and the distance between the upper surface of the side pressing blank and the upper surface of the workpiece 10 to be formed is H.
In the case of hydraulic forming of rubber capsules, the size of the material suspended between the side block 2 and the punch mold 3 has an influence on the forming effect of the workpiece 10, wherein the size of the material suspended between the side block 2 and the punch mold 3 is related to the distance D, the angle α and the distance H.
As can be seen from fig. 2, the side press blocks 2 and the male mold 3 are arranged on the base 1. The side pressing blocks 2 surround the male die mould 3 around the male die mould 3. The male die 3 has a convex-curved configuration on one side, and the male die 3 has a distance D from the side press blocks 2 on the side having the convex-curved configuration. The male mould 3 is arranged here directly on the base 1.
Furthermore, according to the utility model discloses be equipped with adjusting device, can adjust the interval D of terrace die mould child 3 at protruding bent side and side briquetting 2 through this adjusting device.
For example, a positioning mechanism is provided which determines the position of the male mould 3 on the base 1. The positioning means comprise, for example, a positioning pin and a plurality of positioning holes, with which the positioning pin cooperates. For example, the positioning pins are separate members, such as screws, pins, etc., which can pass through positioning holes constructed in the base 1 and the male mold 3 to position the male mold 3 on the base 1. The positioning holes can be configured, for example, as slotted holes in which positioning pins can be mounted. The positioning means comprise, for example, a projection which is formed on the punch mould 3 and which is pressed into a catch in the base 1, and a plurality of catches. The positioning means comprise, for example, a tongue and groove connection. Or the positioning means may for example comprise corresponding snap connections provided on the outer circumference of the male mould 3 and the base 1. Other adjustable positioning means are also contemplated.
Furthermore, one or more spacers 4 are provided between the side of the male mould 3 opposite to the side having the convex bead configuration and the side press blocks 2. On the side on which the shim 4 is arranged, the side pressure piece 2, the shim 4 and the punch form 3 are fixed by means of releasable fastening means, which may be a dowel pin 7 and/or a bolt set 8. It is of course also conceivable to provide the side pressure piece 2 only on the side of the punch form 3 having the convex bead configuration, in which case only the shim 4 needs to be fixed to the punch form 3.
According to the utility model discloses, adjusting device can be implemented into pin connection and/or threaded connection, also can be implemented into the block connection and can loosen the connection wantonly.
The distance D between the side of the punch mold 3 with the convex curvature and the side pressure block 2 can be changed, for example, by an adjusting device when at least one dimension of the workpiece 10 to be formed changes, so that the distance D matches the dimension of the workpiece 10 to be formed, for example, by loosening the bolts connecting the punch mold to the base and loosening the bolts connecting the side pressure block 2, the spacer 4 and the punch mold 3, and then adjusting the position of the punch mold on the base, adding one or more spacers 4 or removing one or more spacers 4 between the side pressure block 2 and the punch mold 3 on the side where the spacer 4 is arranged, changing the distance D, after adjusting the distance D, for example, by fitting a positioning pin into the adjusted positioning hole, and securing the base and punch mold as well as the side pressure block 2, the spacer 4 and the punch mold 3 again.
The use of the adjusting device makes it possible to easily change the distance D between the male die 3 on the side having the convex curved edge configuration and the side press blocks 2 in accordance with the size of the workpiece 10 to be formed. Thereby eliminating the need for special punch molds and side compacts to be used in conjunction therewith for workpieces 10 of various sizes, and reducing tooling manufacturing costs.
Furthermore, the male mould 3 has an air outlet opening 11 on the side with the convex bead configuration. During the molding by the rubber bladder, gas between the workpiece 10 and the male mold 3 can escape through the vent hole and the vent groove 12 connected thereto.
Fig. 3 shows a cross-sectional view of a composite tool for forming convex curved-edge ribs with a side press block according to the present invention. As can be seen from fig. 3, a blade structure 5 and a spacer 6 are also arranged between the male mould 3 and the base 1. Fig. 4 clearly shows the blade structure 5 and the spacer 6. The blade structure 5 is connected on its side with the cutting edge to a spacer 6 and on the side opposite to the cutting edge to the punch mould 3, while the spacer rests against the base 1 on the side facing away from the blade structure 5. The blade arrangement 5 is preferably dimensioned such that its cutting edge is aligned with the outer side of the male mould blank 3 at least on the side having the convex curved edge configuration. The spacer block 6 is dimensioned such that the cutting edge of the blade structure 5 is not concealed and exposed by the spacer block 6. The spacer 6 is only used to space the cutting edge of the blade structure 5 from the base 1. The cushion block 6, the blade structure 5 and the male mould blank 3 may be fixedly connected by fastening means, preferably by fastening bolts or locating pins.
In the rubber bag forming process, the formed workpiece is formed along the convex bent edge of the male die tire through the rubber bag, the deformation area is pressed to the cutting edge of the blade structure, the material of the workpiece tightly covers the blade structure, the material tightly covering the cutting edge of the blade structure under hydraulic pressure is cut by the cutting edge, and therefore the edge cutting of the workpiece is achieved. In addition, the blade structure is a removable structure, whereby repair or replacement of a new blade structure may be performed when the blade structure is dulled.
The following briefly exemplifies the molding process of the convexly curved rib member.
After the distance D between the side of the core mould 3 with the convex curved edge configuration and the side pressure blocks 2 has been adjusted, the position of the core mould with the blade arrangement 5 and the spacer 6 on the base 1 is determined, for example by means of a positioning mechanism, and the core mould 3, the spacer 4 and the side pressure blocks are fixed and fixed. Then, the workpiece 10 to be molded is spread on the punch mold and a fixing hole is drilled in the workpiece 10 to be molded corresponding to the workpiece positioning hole in the punch mold, and a positioning pin is introduced into the fixing hole to position the workpiece 10 to be molded on the assembled die. Then, the die on which the workpiece 10 to be formed is fixed is placed in a rubber bag forming machine, the forming of the workpiece 10 is achieved, and the edge of the workpiece 10 is cut through a blade structure.
Claims (19)
1. A compound frock for shaping convex edge rib spare, it is used for rubber bag hydraulic forming, its characterized in that, compound frock includes:
a base (1);
a male mold (3) arranged on the base (1) and having a shape of a convex bead on one side;
the lateral pressure blocks (2) are arranged on the base (1), are positioned on one side of the convex bent edge of the male die mould (3) and are separated from the male die mould (3) by a distance (D); and
and the adjusting device is used for adjusting the distance (D) between the male die tire (3) and the side pressing block (2).
2. A composite tooling for forming a convexly curved edge rib as claimed in claim 1, wherein the adjusting means comprises:
a positioning mechanism for determining the position of the male die mould (3) on the base (1);
at least one shim (4) arranged on the side of the male mould (3) opposite to the side of the convex curve;
fastening means for fixing the at least one shim (4) on the side of the male mould (3) opposite to the side of the convex curve.
3. A composite tooling for forming a convexly curved edge rib as claimed in claim 2, wherein the locating mechanism comprises a locating pin and a plurality of locating holes.
4. A composite tooling for forming a convexly curved edge rib as claimed in claim 2, wherein the locating mechanism comprises a raised portion and a plurality of slots.
5. A composite tooling assembly for forming a convexly curved edge rib as claimed in claim 2, wherein the locating mechanism comprises a tongue and groove connection.
6. A composite tooling for forming a male curved edge rib according to claim 2, wherein the positioning mechanism comprises corresponding snap connections provided on the outer peripheral surfaces of the male die (3) and the base (1).
7. A composite tooling for moulding a male curved edge rib according to claim 4, characterised in that the raised portion is configured on the male mould (3) and is pressed into a bayonet slot in the base (1).
8. A composite tooling for forming a convexly curved edge rib as claimed in claim 3, wherein the locating holes are kidney-shaped holes.
9. A composite tooling for forming a convex curved edge rib according to claim 3, wherein the locating holes are a plurality of holes located in sequence from the side of the convex curved edge to the opposite side of the convex curved edge.
10. A composite tooling for forming a male curved edge rib according to claim 3, wherein the locating pins are separate components, and pass through locating holes in the base (1) and the male die tyre (3).
11. A composite tooling for forming a male curved edge rib according to claim 1, characterized in that the male die mould (3) is arranged directly on the base (1).
12. A composite tooling for forming a convexly curved ribbed member according to claim 1, characterized in that a blade structure (5) and a spacer (6) for cutting off the formed workpiece are further arranged between the male die (3) and the base (1).
13. A tooling assembly according to claim 12, wherein the blade structure (5) is connected to the spacer (6) on the side thereof having the cutting edge and to the male mould (3) on the side opposite to the side having the cutting edge.
14. A composite tooling for forming a male curved edge rib according to claim 12, characterized in that the spacer block (6), the blade structure (5) and the male mould blank (3) are fixed to each other by fastening means.
15. A composite tooling for moulding a male curved edge rib according to claim 13, characterised in that the blade structure (5) is dimensioned such that its cutting edge is aligned with the outer side of the male mould (3) at least on the side having the male curved edge configuration.
16. A composite tooling for forming a male curved edge rib according to claim 13, characterized in that the spacer (6) is dimensioned such that the edge portion of the blade structure (5) is not covered by the spacer (6).
17. A composite tooling assembly for forming a convexly curved edge rib as claimed in claim 12, wherein the blade structure is a detachable structure.
18. A composite tooling assembly for forming a male curved edge rib according to claim 2 or 14 wherein the fastening means comprises a bayonet connection and/or a screw connection.
19. A composite tooling for forming a male curved edge rib according to claim 18, wherein the threaded connection is a bolt (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721280639.5U CN207547357U (en) | 2017-09-30 | 2017-09-30 | For being molded the composite tooling of male bend side ribbed part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721280639.5U CN207547357U (en) | 2017-09-30 | 2017-09-30 | For being molded the composite tooling of male bend side ribbed part |
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| Publication Number | Publication Date |
|---|---|
| CN207547357U true CN207547357U (en) | 2018-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721280639.5U Active CN207547357U (en) | 2017-09-30 | 2017-09-30 | For being molded the composite tooling of male bend side ribbed part |
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| CN (1) | CN207547357U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110788194A (en) * | 2019-10-16 | 2020-02-14 | 沈阳航空航天大学 | A kind of device based on rubber bag forming with movable side pressing block and using method thereof |
| CN111451651A (en) * | 2020-04-30 | 2020-07-28 | 中国航发航空科技股份有限公司 | Engine leather cup cutting clamp and cutting method |
| CN112719021A (en) * | 2020-12-11 | 2021-04-30 | 中航贵州飞机有限责任公司 | Flexible side pressing block composite tool for forming sheet metal part rubber bag and using method |
| CN113249665A (en) * | 2021-07-02 | 2021-08-13 | 中国航发北京航空材料研究院 | Forming method of aluminum alloy component |
-
2017
- 2017-09-30 CN CN201721280639.5U patent/CN207547357U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110788194A (en) * | 2019-10-16 | 2020-02-14 | 沈阳航空航天大学 | A kind of device based on rubber bag forming with movable side pressing block and using method thereof |
| CN111451651A (en) * | 2020-04-30 | 2020-07-28 | 中国航发航空科技股份有限公司 | Engine leather cup cutting clamp and cutting method |
| CN111451651B (en) * | 2020-04-30 | 2022-04-29 | 中国航发航空科技股份有限公司 | Engine leather cup cutting clamp and cutting method |
| CN112719021A (en) * | 2020-12-11 | 2021-04-30 | 中航贵州飞机有限责任公司 | Flexible side pressing block composite tool for forming sheet metal part rubber bag and using method |
| CN113249665A (en) * | 2021-07-02 | 2021-08-13 | 中国航发北京航空材料研究院 | Forming method of aluminum alloy component |
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