CN115740811A - Tool for double-beam welding reinforcing rib of skin test piece - Google Patents
Tool for double-beam welding reinforcing rib of skin test piece Download PDFInfo
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- CN115740811A CN115740811A CN202310005585.5A CN202310005585A CN115740811A CN 115740811 A CN115740811 A CN 115740811A CN 202310005585 A CN202310005585 A CN 202310005585A CN 115740811 A CN115740811 A CN 115740811A
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
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Abstract
The invention discloses a tool for a double-beam welding reinforcing rib of a skin test piece, which comprises a base, wherein a supporting assembly is arranged on the base, a molded surface is constructed on the supporting assembly, the skin is attached to the molded surface, a plurality of beam assemblies are also arranged on the base, the beam assemblies are arranged above the skin in a spanning mode, the reinforcing rib is connected to the beam assemblies, a positioning part is arranged on each beam assembly, and the positioning part can enable the reinforcing rib to be tightly abutted to the surface of the skin. The tool can conveniently realize the assembly clamping between the reinforcing rib and the skin through the matching of the supporting component, the beam component and the positioning part. The tool has high use convenience, and the manufacturing period of the skin test piece is greatly reduced.
Description
Technical Field
The invention relates to the technical field of aircraft manufacturing, in particular to a tool for a double-beam welding reinforcing rib of a skin test piece.
Background
The principle of laser welding can be divided into heat conduction type welding and laser deep melting welding, the heat conduction type laser welding principle is that the surface to be processed is heated by laser radiation, surface heat is diffused to the inside through heat conduction, and a workpiece is melted to form a specific molten pool by controlling laser parameters such as the width, energy, peak power and repetition frequency of laser pulse.
The airplane skin parts are important stressed components forming the appearance structure of the airplane. In the skin test stage, skin test pieces need to be manufactured as soon as possible for testing. This has proposed higher requirement to whether the frock that uses in the skin manufacturing process is swift high-efficient. Particularly, the tool is used for clamping the skin and the reinforcing ribs when the reinforcing ribs are welded on the skin, and whether the tool is used for clamping is quick and stable when the tool is used, so that the manufacturing period of the skin is influenced. The existing tool clamp is complex and inconvenient to use, and the tool convenient to use is required to be provided for clamping when the reinforcing ribs are welded on the skin.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a tool for a double-beam welding reinforcing rib of a skin test piece.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a frock for two beam-welding strengthening ribs of skin test piece, includes the base, be provided with supporting component on the base, the last profile that has constructed of supporting component, the skin laminating is in on the profile, still be provided with a plurality of beam assembly on the base, beam assembly strides and establishes in the skin top, and the strengthening rib is connected beam assembly is last, just be provided with location portion on the beam assembly, location portion can support the strengthening rib tightly in the surface of skin.
The supporting component comprises a plurality of supporting plates which are arranged in a criss-cross mode, mounting surfaces are constructed on the supporting plates, and the mounting surfaces are matched to form the molded surface.
The beam assembly comprises a connecting plate, a pressing plate is detachably connected to the side wall of the connecting plate, and the pressing plate can press the reinforcing ribs on the side wall of the connecting plate.
The positioning part comprises a plurality of positioning screws which are in threaded connection with the connecting plate, and the plurality of positioning screws are uniformly distributed along the reinforcing rib.
A plurality of guide grooves are formed in the connecting plate, the guide grooves extend towards one side of the reinforcing rib, and the positioning screws are matched in the guide grooves.
The base is further provided with a plurality of pressing assemblies, the pressing assemblies are arranged above the skin in a crossing mode, pressing portions are arranged on the pressing assemblies, and the pressing portions can enable the skin to be tightly abutted to the molded surfaces.
The pressing assembly comprises a mounting plate, the pressing portion comprises pressing screws in threaded connection on the mounting plate, and the pressing screws are evenly distributed along the skin.
The support assembly further comprises a plurality of heat dissipation plates, the heat dissipation plates are opposite to the reinforcing ribs, and heat dissipation parts are arranged on the heat dissipation plates and attached to the skin.
The heat dissipation piece includes a plurality of radiating blocks that distribute along the strengthening rib, set up the heat preservation chamber in the radiating block, be provided with the subassembly of taking a breath in the heat preservation intracavity, the subassembly of taking a breath can with the high-temperature gas in the heat preservation intracavity discharges to the external world.
The heat dissipation plate is provided with a mounting groove opposite to the heat dissipation block, the ventilation assembly comprises a push plate which is connected in the heat insulation cavity in a sealing sliding manner, the push plate divides the heat insulation cavity into a first cavity body close to one side of the skin and a second cavity body close to one side of the heat dissipation plate, the heat dissipation block is provided with a pressure relief hole communicated with the second cavity body in a penetrating manner, and the pressure relief hole is communicated with the outside;
an air bag is arranged in the mounting groove, an air exchange pipe is communicated with the air bag, the air exchange pipe penetrates through the push plate and extends into the first cavity, an air outlet hole is formed in the end part of the air exchange pipe, a plugging part is arranged on the push plate, and when the plugging part is opposite to the air outlet hole, the air outlet hole is sealed;
an exhaust hole communicated with the first cavity is further formed in the heat dissipation block in a penetrating mode, the exhaust hole is communicated with the outside, a closed portion is further arranged on the push plate, and the closed portion is opposite to the exhaust hole, and the exhaust hole is closed;
a push rod is arranged on the push plate and extends towards one side of the air bag;
when the push pedal to when gasbag one side slides, the push rod extrusion the gasbag to make gas in the gasbag impresses in the breather pipe, just the closing part with the exhaust hole dislocation is so that the open distance in exhaust hole with the shutoff portion with the venthole dislocation is so that the open distance in venthole is the same, still be provided with the air supplement pipe that communicates in the external world on the gasbag, be provided with the valve body that is used for controlling gas to the one-way circulation in the gasbag in the air supplement pipe.
The beneficial effects of the invention are:
(1) The tool can conveniently realize the assembly clamping between the reinforcing rib and the skin through the matching of the supporting component, the beam component and the positioning part. The tool has high use convenience, and the manufacturing period of the skin test piece is greatly reduced.
(2) The tooling can be matched with a double-beam welding process through a heat dissipation part, so that the skin and the reinforcing ribs are in a state with lower heat dissipation performance in the range of low-power laser, and the condition of forming advanced heat treatment is kept; and the laser is in a state of better heat dissipation performance in the range of high-power laser so as to prevent the situation of mechanical property reduction caused by overheating. Namely, the skin clamped by the tool for welding has better mechanical property.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment;
FIG. 2 is a schematic view of the cross-beam assembly;
FIG. 3 is a schematic view of the hold-down assembly;
fig. 4 is a schematic structural view of a heat sink;
fig. 5 is a schematic structural view of the ventilation assembly.
Reference numerals are as follows: 1. a base; 2. a support assembly; 3. a profile surface; 4. a cross beam assembly; 5. a positioning part; 6. a support plate; 7. a mounting surface; 8. a connecting plate; 9. pressing a plate; 10. a set screw; 11. a guide groove; 12. a compression assembly; 13. a pressing part; 14. mounting a plate; 15. a compression screw; 16. a heat dissipation plate; 17. a heat sink; 18. a heat dissipating block; 19. a heat preservation cavity; 20. a ventilation assembly; 21. mounting grooves; 22. pushing a plate; 23. a first cavity; 24. a second cavity; 25. a pressure relief vent; 26. an air bag; 27. a ventilation tube; 28. an air outlet; 29. a plugging section; 30. an exhaust hole; 31. a closing part; 32. a push rod; 33. a gas supplementing pipe; 34. a valve body; 35. plugging the pipe; 36. a closing plate; 37. and (5) reinforcing ribs.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the tooling for the double-beam welding reinforcing ribs of the skin test piece comprises a base 1.
As shown in fig. 1 to 5, a support assembly 2 is arranged on a base 1, the top surface of the support assembly 2 being constructed with a profile 3, which profile 3 matches the construction of the skin to be welded. During the welding operation, the skin is applied to the support element 2 (i.e. to the profile 3). In addition, still be provided with a plurality of beam assembly 4 on the base 1, a plurality of beam assembly 4 are along transversely arranging to the relative position department that needs welding strengthening rib 37 at the covering is striden to the one-to-one correspondence. During welding operation, the reinforcing ribs 37 are connected to the beam assembly 4, the beam assembly 4 is further provided with positioning portions 5, and the reinforcing ribs 37 can be abutted against the surface of the skin through the positioning portions 5 so as to weld the skin and the reinforcing ribs 37.
Specifically, the supporting component 2 comprises a plurality of supporting plates 6 which are arranged in a criss-cross manner, the top surface of each supporting plate 6 is provided with a mounting surface 7, and the mounting surfaces 7 are matched to form the molded surface 3; the beam assembly 4 comprises a connecting plate 8, the connecting plate 8 is preferably arch-shaped, and two ends of the connecting plate 8 are fixedly connected to the base 1 through connecting seats; the positioning portion 5 includes a plurality of positioning screws 10 screwed on the connecting plate 8, the plurality of positioning screws 10 are uniformly distributed along the reinforcing rib 37, and an elastic body is disposed at an end of each positioning screw 10. In addition, the side wall of the connecting plate 8 is detachably connected with a pressing plate 9, the pressing plate 9 and the connecting plate 8 are detachably connected through bolts, and the reinforcing ribs 37 to be welded can be pressed on the side wall of the connecting plate 8 through the pressing plate 9.
Based on the above arrangement, when the reinforcing beads 37 are assembled, the reinforcing beads 37 to be welded are preliminarily attached to the side walls of the connecting plate 8 by the pressing plates 9. Subsequently, the set screw 10 is rotated, and the set screw 10 moves toward the rib 37. The elastomer on the end of the set screw 10 will then abut the stiffener 37 and apply a force to the stiffener 37 against the surface of the skin.
Preferably, the connecting plate 8 is further provided with a plurality of guide grooves 11, and the plurality of guide grooves 11 correspond to the plurality of positioning screws 10 one to one. Each guide groove 11 extends toward the rib 37, and the set screw 10 is fitted in the guide groove 11. Obviously, the guide groove 11 can guide the set screw 10, so that the set screw 10 can apply a more stable abutting force to the reinforcing bar 37.
In order to ensure the position stability and the welding precision during the skin welding operation, the base 1 is also provided with a plurality of pressing components 12, and the pressing components 12 are also arranged above the skin in a spanning manner. Accordingly, the pressing assembly 12 is provided with a pressing portion 13, and the skin can be pressed against the molded surface 3 through the pressing portion 13, so that the clamping stability of the skin is higher.
Specifically, the hold down assembly 12 includes a mounting plate 14. Similarly to the connection plate 8, the mounting plate 14 is also preferably arch-shaped, and both ends thereof are also fixedly connected to the base 1 through the connection seats; the compression part 13 comprises a plurality of compression screws 15 which are connected to the mounting plate 14 in a threaded manner, and the plurality of compression screws 15 are uniformly distributed along the skin. The use method of the compression screw 15 is similar to that of the positioning screw 10, and is not described herein.
In order to enhance the heat dissipation performance of the tooling on the skin and improve the quality of welding operation, a plurality of heat dissipation plates 16 are also arranged in the support assemblies 2, and the heat dissipation plates 16 correspond to the beam assemblies 4 one by one. In other words, the support plate 6 opposite to the beam assembly 4 may be selected as the heat dissipation plate 16. Obviously, the heat dissipation plate 16 should be oriented in the same direction as the ribs 37, for example, the heat dissipation plate 16 and the ribs 37 are arranged in the lateral direction. Depending on the shape of the ribs 37. And a heat dissipation member 17 is provided on the top surface of the heat dissipation plate 16, and the heat dissipation member 17 is attached to the skin to dissipate heat generated when the skin is welded.
Furthermore, it should be appreciated that when the stiffeners 37 are welded to the skin, the welding process is preferably performed by two-beam welding, based on the characteristics of the skin and the stiffeners 37. Double beam welding is a method of optically separating one laser beam into two separate laser beams for welding. Two laser beams are divided into a high power laser beam and a low power laser beam, and the low power laser beam is in front of the high power laser beam, so that a heat treatment for a welding piece in advance can be formed. That is, the reinforcing ribs 37 and the skin in the range of the low-power laser should be in a state of low heat dissipation property to maintain the condition of forming the advanced heat treatment; and the reinforcing ribs 37 and the skin in the range of high-power laser should be in a state of good heat dissipation performance so as to prevent the condition that the mechanical property is reduced due to overheating of weldments.
To the technical problem, the heat dissipation member 17 is designed to include a plurality of heat dissipation blocks 18 which are uniformly distributed along the reinforcing ribs 37, the heat dissipation blocks 18 are internally provided with heat preservation cavities 19, and relatively static gas in the heat preservation cavities 19 is utilized to keep heat not easy to quickly lose. And the heat preservation chamber 19 is internally provided with a ventilation assembly 20, and high-temperature gas in the heat preservation chamber 19 can be discharged to the outside through the ventilation assembly 20, so that the cooling of the heat dissipation block 18 and the heat dissipation of the reinforcing rib 37 and the skin are realized.
More specifically, the top surface of the heat dissipation plate 16 is provided with an installation groove 21 opposite to the heat dissipation block 18, and the ventilation assembly 20 comprises a push plate 22 which is connected in the heat preservation cavity 19 in a sealing and sliding manner. Under the action of the push plate 22, the heat preservation cavity 19 is divided into two cavities, which are respectively: a first cavity 23 on the side near the skin and a second cavity 24 on the side near the heat spreader 16. The radiating block 18 is provided with a pressure relief hole 25 for communicating the second cavity 24 with the outside. It will be apparent that the first chamber 23 is formed with a relatively closed chamber.
An air bag 26 is arranged in the mounting groove 21, and a ventilation pipe 27 and an air supplement pipe 33 are respectively communicated with the air bag 26. Wherein, the air exchanging pipe 27 extends to one side of the heat radiating block 18, and penetrates through the second cavity 24 and the push plate 22 in sequence to extend into the first cavity 23; the air supply pipe 33 is directly connected to the outside. In more detail, the end part of the ventilation pipe 27 extending into the cavity I23 is provided with an air outlet 28, the push plate 22 is correspondingly provided with a blocking part 29, and when the blocking part 29 is opposite to the air outlet 28, the blocking part 29 blocks the air outlet 28, so that the air outlet 28 is in a closed state; the air supply pipe 33 is provided with a one-way valve for controlling air to flow into the air bag 26 in one way to realize the air supply action of the air bag 26.
In addition, the heat dissipation block 18 is further provided with a vent hole 30 which communicates the first cavity 23 with the outside, the push plate 22 is further correspondingly provided with a sealing portion 31, and when the sealing portion 31 is opposite to the vent hole 30, the sealing portion 31 seals the air outlet 28, so that the air outlet 28 is in a sealing state.
And a push rod 32 extending towards one side of the air bag 26 is arranged on the push plate 22, and the closing part 31 and the vent hole 30 are staggered to ensure that the opening distance of the vent hole 30 is the same as the opening distance of the blocking part 29 and the vent hole 28.
Based on the setting, the heat dissipation process of the tool during the welding operation of the skin double-beam welding reinforcing ribs 37 is as follows:
during welding, two areas with different heat generated by two lasers with different powers on the reinforcing ribs 37 and the skin are opposite to the adjacent radiating blocks 18 respectively. The radiating block 18 opposite to the area with low heat, namely the radiating block 18 opposite to the area needing the advanced heat treatment of the skin and the reinforcing ribs 37, because the heat conducted by the radiating block 18 is low, the radiating block 18 is in a heat retaining state under the action of the heat insulation cavity 19, and therefore the skin and the reinforcing ribs 37 in the area are kept in the condition of the advanced heat treatment.
The heat dissipation block 18 corresponding to the high-power laser conducts a large amount of heat, and since the first cavity 23 is in a closed state, the air in the first cavity 23 is heated and expands, so that the push plate 22 is driven to slide towards the side of the air bag 26. During this process, the push rod 32 will press against the air bag 26 and cause the gas in the air bag 26 to be forced into the ventilation tube 27. At this time, since the air outlet 28 of the ventilation pipe 27 is blocked by the blocking portion 29, a large air pressure is generated in the ventilation pipe 27. With the continuous sliding of the push plate 22, the closed portion 31 will be gradually dislocated from the vent hole 30, and the blocking portion 29 will be gradually dislocated from the vent hole 28. Until the exhaust hole 30 and the air outlet 28 are opened at the same time, the gas with lower temperature in the air exchanging pipe 27 can be filled into the first cavity 23, so that the gas with higher temperature in the first cavity 23 is exhausted to the outside through the exhaust hole 30.
The air supply tube 33 supplies air to the air bag 26, and the first chamber 23 is not kept in the filling state because the first chamber 23 is filled with air with a lower temperature. The inflated airbag 26 then pushes the push plate 22 back to the initial position, so that the ventilation assembly 20 continuously ventilates the insulating cavity 19 for the purpose of dissipating heat from the skin and the stiffeners 37 in the range of high-power laser. In other words, in this case, the air in the insulated chamber 19 has a heat dissipating effect of absorbing heat and then discharging the heat to the outside by the ventilation assembly 20.
More specifically, the blocking portion 29 includes a blocking tube 35, and the ventilation tube 27 extends into the first cavity 23 through the blocking tube 35. The air outlet 28 is arranged on the side wall of the air exchanging pipe 27, the air exchanging pipe 27 and the plugging pipe 35 have matched sizes, and then the plugging pipe 35 can plug the air outlet 28; the closing part 31 comprises a closing plate 36, and the closing plate 36 is attached to the inner wall of the heat preservation cavity 19 provided with the exhaust hole 30, so that the exhaust hole 30 is sealed when the closing plate 36 is opposite to the exhaust hole 30.
The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and is not to be construed as limited to the exclusion of other embodiments, and that various other combinations, modifications, and environments may be used and modifications may be made within the scope of the concepts described herein, either by the above teachings or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a frock that is used for two beam welding strengthening ribs of skin test piece, characterized by: including base (1), be provided with supporting component (2) on base (1), be constructed profile (3) on supporting component (2), the covering laminating is in on profile (3), still be provided with a plurality of beam assembly (4) on base (1), establish in the covering top is striden in beam assembly (4), and the strengthening rib is connected on beam assembly (4), just be provided with location portion (5) on beam assembly (4), location portion (5) can support the strengthening rib in the surface of covering tightly.
2. The tool for the double-beam welding reinforcing rib of the skin test piece as claimed in claim 1, wherein the tool comprises: the supporting component (2) comprises a plurality of supporting plates (6) which are arranged in a criss-cross mode, an installing surface (7) is constructed on each supporting plate (6), and the installing surfaces (7) are matched to form the molded surface (3).
3. The tool for the double-beam welding reinforcing rib of the skin test piece as claimed in claim 1, wherein the tool comprises: the beam assembly (4) comprises a connecting plate (8), a pressing plate (9) is detachably connected to the side wall of the connecting plate (8), and the pressing plate (9) can press the reinforcing ribs on the side wall of the connecting plate (8).
4. The tool for the double-beam welding reinforcing rib of the skin test piece as claimed in claim 3, wherein the tool comprises: the positioning portion (5) comprises a plurality of positioning screws (10) which are in threaded connection with the connecting plate (8), and the plurality of positioning screws (10) are uniformly distributed along the reinforcing ribs.
5. The tool for the double-beam welding reinforcing rib of the skin test piece as claimed in claim 4, wherein the tool comprises: a plurality of guide grooves (11) are formed in the connecting plate (8), the guide grooves (11) extend towards one side of the reinforcing rib, and the positioning screws (10) are matched in the guide grooves (11).
6. The tool for the double-beam welding reinforcing ribs of the skin test piece as claimed in claim 1, wherein the tool comprises: the base (1) is further provided with a plurality of pressing components (12), the pressing components (12) are arranged above the skin in a crossing mode, pressing portions (13) are arranged on the pressing components (12), and the skin can be abutted to the molded surface (3) through the pressing portions (13).
7. The tool for the double-beam welding reinforcing ribs of the skin test piece as claimed in claim 6, wherein the tool comprises: the pressing assembly (12) comprises a mounting plate (14), the pressing portion (13) comprises pressing screws (15) which are in threaded connection on the mounting plate (14), and the pressing screws (15) are evenly distributed along the skin.
8. The tool for the double-beam welding reinforcing rib of the skin test piece as claimed in claim 2, wherein the tool comprises: the support component (2) further comprises a plurality of radiating plates (16), the radiating plates (16) are opposite to the reinforcing ribs, radiating pieces (17) are arranged on the radiating plates (16), and the radiating pieces (17) are attached to the skin.
9. The tool for the double-beam welding reinforcing ribs of the skin test piece as claimed in claim 8, wherein the tool comprises: the heat dissipation piece (17) includes a plurality of radiating block (18) that distribute along the strengthening rib, heat preservation chamber (19) have been seted up in radiating block (18), be provided with ventilation assembly (20) in heat preservation chamber (19), ventilation assembly (20) can with high-temperature gas in heat preservation chamber (19) discharges to the external world.
10. The tool for the double-beam welding reinforcing rib of the skin test piece as claimed in claim 9, wherein the tool comprises: the heat dissipation plate (16) is provided with a mounting groove (21) opposite to the heat dissipation block (18), the ventilation assembly (20) comprises a push plate (22) connected in the heat preservation cavity (19) in a sealing and sliding mode, the push plate (22) divides the heat preservation cavity (19) into a first cavity body (23) close to one side of a skin and a second cavity body (24) close to one side of the heat dissipation plate (16), the heat dissipation block (18) is provided with a pressure relief hole (25) communicated with the second cavity body (24) in a penetrating mode, and the pressure relief hole (25) is communicated with the outside;
an air bag (26) is arranged in the mounting groove (21), a ventilation pipe (27) is communicated with the air bag (26), the ventilation pipe (27) penetrates through the push plate (22) and extends into the first cavity (23), an air outlet (28) is formed in the end part of the ventilation pipe (27), a blocking part (29) is arranged on the push plate (22), and when the blocking part (29) is opposite to the air outlet (28), the air outlet (28) is closed;
an exhaust hole (30) communicated with the first cavity (23) is further formed in the heat dissipation block (18) in a penetrating mode, the exhaust hole (30) is communicated with the outside, a sealing portion (31) is further arranged on the push plate (22), and when the sealing portion (31) is opposite to the exhaust hole (30), the exhaust hole (30) is sealed;
a push rod (32) is arranged on the push plate (22), and the push rod (32) extends towards one side of the air bag (26);
when the push plate (22) slides towards one side of the air bag (26), the push rod (32) extrudes the air bag (26) and enables gas in the air bag (26) to be pressed into the ventilating pipe (27), the sealing part (31) and the vent hole (30) are staggered to enable the opening distance of the vent hole (30) to be the same as the opening distance of the sealing part (29) and the vent hole (28), the air bag (26) is further provided with an air supplementing pipe (33) communicated with the outside, and a valve body (34) used for controlling the gas to flow into the air bag (26) in a one-way mode is arranged in the air supplementing pipe (33).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310005585.5A CN115740811B (en) | 2023-01-04 | 2023-01-04 | Tooling for double-beam welding reinforcing ribs of skin test piece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310005585.5A CN115740811B (en) | 2023-01-04 | 2023-01-04 | Tooling for double-beam welding reinforcing ribs of skin test piece |
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| CN115740811A true CN115740811A (en) | 2023-03-07 |
| CN115740811B CN115740811B (en) | 2023-04-28 |
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