CN115740811B - Tooling for double-beam welding reinforcing ribs of skin test piece - Google Patents
Tooling for double-beam welding reinforcing ribs of skin test piece Download PDFInfo
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- CN115740811B CN115740811B CN202310005585.5A CN202310005585A CN115740811B CN 115740811 B CN115740811 B CN 115740811B CN 202310005585 A CN202310005585 A CN 202310005585A CN 115740811 B CN115740811 B CN 115740811B
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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 welding reinforcing ribs by double beams of a skin test piece, which comprises a base, wherein a supporting component is arranged on the base, a molded surface is constructed on the supporting component, the skin is attached to the molded surface, a plurality of beam components are also arranged on the base, the beam components are arranged above the skin in a straddling manner, the reinforcing ribs are connected to the beam components, and a positioning part is arranged on the beam components and can prop the reinforcing ribs against the surface of the skin. According to the tooling, the assembly clamping between the reinforcing ribs and the skin can be conveniently realized through the cooperation of the supporting component, the beam component and the positioning part. The tool has higher 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 tooling for double-beam welding reinforcing ribs 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 laser radiation heats the surface to be processed, surface heat is diffused to the inside through heat conduction, and a specific molten pool is formed by controlling laser parameters such as the width, energy, peak power, repetition frequency and the like of laser pulse to melt a workpiece.
Aircraft skin type parts are important stress members that make up the exterior structure of an aircraft. In the skin test stage, a test piece of the skin needs to be manufactured as soon as possible to perform the test. The tooling used in the skin manufacturing process has high requirements on whether the tooling is rapid and efficient. In particular, the frock that is used for centre gripping skin and strengthening rib when the skin welding strengthening rib, whether swift, stable will influence the manufacturing cycle of skin when this frock centre gripping uses. The existing tool clamp is mostly tedious and inconvenient to use, and the tool convenient to use is required to clamp when the skin welding reinforcing ribs are provided.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a tooling for double-beam welding reinforcing ribs of a skin test piece.
The aim of the invention is realized by the following technical scheme:
the utility model provides a frock for two light 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 components on the base, beam component strides to establish in the skin top, the strengthening rib is connected beam component is last, just be provided with location portion on the beam component, 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 crisscross mode, a mounting surface is constructed on the supporting plates, and a plurality of 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 locating part comprises a plurality of locating screws which are connected with the connecting plate through threads, and the locating screws are uniformly distributed along the reinforcing ribs.
The connecting plate is provided with a plurality of guide grooves, the guide grooves extend to one side of the reinforcing rib, and the positioning screws are matched in the guide grooves.
The base is also provided with a plurality of compression assemblies, the compression assemblies are arranged above the skin in a straddling mode, the compression assemblies are provided with compression parts, and the compression parts can tightly prop the skin on the molded surface.
The compression assembly comprises a mounting plate, the compression part comprises compression screws which are connected with the mounting plate through threads, and the compression screws are uniformly distributed along the skin.
The support assembly further comprises a plurality of radiating plates, the radiating plates are opposite to the reinforcing ribs, radiating pieces are arranged on the radiating plates, and the radiating pieces are 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 preservation cavity in a sealing sliding manner, the push plate divides the heat preservation cavity into a first cavity close to one side of the skin and a second cavity close to one side of the heat dissipation plate, the heat dissipation block is provided with a pressure relief hole in a penetrating manner, the pressure relief hole is communicated with the second cavity, and the pressure relief hole is communicated with the outside;
an air bag is arranged in the mounting groove, an air exchanging pipe is communicated with the air bag, the air exchanging pipe penetrates through the push plate and stretches into the first cavity, an air outlet hole is formed in the end portion of the air exchanging pipe, a blocking portion is arranged on the push plate, and when the blocking portion is opposite to the air outlet hole, the air outlet hole is closed;
the heat dissipation block is also provided with an exhaust hole communicated with the first cavity in a penetrating way, the exhaust hole is communicated with the outside, the push plate is also provided with a sealing part, and when the sealing part is opposite to the exhaust hole, the exhaust hole is sealed;
the pushing plate is provided with a pushing rod which extends to one side of the air bag;
when the push plate slides to one side of the air bag, the push rod extrudes the air bag, so that gas in the air bag is pressed into the ventilation pipe, the sealing part and the vent holes are staggered, the distance of the vent holes which are opened is identical to the distance of the sealing part and the vent holes which are staggered, the vent holes which are opened are also identical, the air bag is further provided with a gas supplementing pipe which is communicated with the outside, and a valve body which is used for controlling the gas to flow in the air bag in a unidirectional way is arranged in the gas supplementing pipe.
The beneficial effects of the invention are as follows:
(1) And the assembly clamping between the reinforcing ribs and the skin can be conveniently realized by the aid of the supporting assembly, the beam assembly and the positioning part. The tool has higher 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 the heat dissipation piece, so that the skin and the reinforcing ribs are in a state of low 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 with better heat radiation performance in the range of high-power laser so as to prevent the condition of mechanical property reduction caused by overheating. The skin welded by clamping the tool has better mechanical properties.
Drawings
FIG. 1 is a schematic diagram of an embodiment;
FIG. 2 is a schematic structural view of a beam assembly;
FIG. 3 is a schematic view of the structure of the hold-down assembly;
FIG. 4 is a schematic structural view of a heat sink;
fig. 5 is a schematic structural view of a ventilation assembly.
Reference numerals: 1. a base; 2. a support assembly; 3. a profile; 4. a beam assembly; 5. a positioning part; 6. a support plate; 7. a mounting surface; 8. a connecting plate; 9. a pressing plate; 10. a set screw; 11. a guide groove; 12. a compression assembly; 13. a pressing part; 14. a mounting plate; 15. a compression screw; 16. a heat dissipation plate; 17. a heat sink; 18. a heat dissipation block; 19. a heat preservation cavity; 20. a ventilation assembly; 21. a mounting groove; 22. a push plate; 23. a first cavity; 24. a second cavity; 25. a pressure relief hole; 26. an air bag; 27. an air exchanging pipe; 28. an air outlet hole; 29. a blocking part; 30. an exhaust hole; 31. a closing part; 32. a push rod; 33. an air supplementing pipe; 34. a valve body; 35. plugging the pipe; 36. a closing plate; 37. reinforcing ribs.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
As shown in FIG. 1, a tooling for double-beam welding of reinforcing ribs of a skin test piece comprises a base 1.
As shown in fig. 1 to 5, the base 1 is provided with a support assembly 2, and the top surface of the support assembly 2 is provided with a molded surface 3, and the molded surface 3 is matched with the construction of a skin to be welded. During the welding operation, the skin is applied to the support assembly 2 (i.e. to the profile 3). In addition, a plurality of beam assemblies 4 are further arranged on the base 1, and the beam assemblies 4 are transversely arranged and correspondingly arranged at the positions, corresponding to the positions, where the skin needs to be welded with the reinforcing ribs 37, in a one-to-one mode. During welding operation, the reinforcing ribs 37 are connected to the beam assembly 4, and the beam assembly 4 is further provided with the positioning parts 5, and the reinforcing ribs 37 can be abutted against the surface of the skin through the positioning parts 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 crisscross manner, the top surface of each supporting plate 6 is provided with a mounting surface 7, and the plurality of 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 ribs 37, and an elastic body is disposed at the end of each positioning screw 10. In addition, the lateral wall of connecting plate 8 is last to be dismantled and to be connected with clamp plate 9, and clamp plate 9 passes through the bolt with connecting plate 8 and realizes dismantling the connection, and can be with the strengthening rib 37 pressfitting that waits to weld on the lateral wall of connecting plate 8 through clamp plate 9.
Based on the above arrangement, when the reinforcing ribs 37 are assembled, the reinforcing ribs 37 to be welded are preliminarily connected to the side walls of the connecting plate 8 through the pressing plate 9. Subsequently, the set screw 10 is rotated, and the set screw 10 moves toward the reinforcing rib 37 side. Further, the elastic body on the end of the set screw 10 abuts against the stiffener 37 and applies a force against the surface of the skin to the stiffener 37.
Preferably, the connecting plate 8 is further provided with a plurality of guide grooves 11, and the guide grooves 11 are in one-to-one correspondence with the positioning screws 10. And each guide groove 11 extends to one side of the reinforcing rib 37, and the set screw 10 is fitted in the guide groove 11. Obviously, the guide groove 11 guides the set screw 10 so that the set screw 10 can act on the reinforcing rib 37 with a more stable abutment force.
In order to ensure the position stability and welding precision during the skin welding operation, the base 1 is further provided with a plurality of compression assemblies 12, and the compression assemblies 12 are also arranged above the skin in a straddling manner. Correspondingly, the compressing assembly 12 is provided with the compressing part 13, and the skin can be abutted against the molded surface 3 through the compressing part 13, so that the clamping stability of the skin is higher.
Specifically, the compression assembly 12 includes a mounting plate 14. Similar to the connection plate 8, the mounting plate 14 is also preferably arch-shaped, with both ends thereof also being fixedly connected to the base 1 by connection seats; the pressing part 13 comprises a plurality of pressing screws 15 which are connected to the mounting plate 14 in a threaded manner, and the plurality of pressing screws 15 are uniformly distributed along the skin. The method of using the compression screw 15 is similar to that of the set screw 10, and will not be described here.
In order to enhance the heat dissipation performance of the tooling on the skin, so that the quality of welding operation is improved, a plurality of heat dissipation plates 16 are further arranged in the support assembly 2, and the heat dissipation plates 16 are in one-to-one correspondence with the beam assemblies 4. In other words, the support plate 6 opposite to the beam assembly 4 may be selected as the heat radiation plate 16. Obviously, the orientation of the heat dissipating plate 16 should be the same as the orientation of the ribs 37, for example, the heat dissipating plate 16 and the ribs 37 are both disposed laterally. Depending on the shape of the stiffener 37 design. And a heat dissipation member 17 is disposed 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 during skin welding.
Furthermore, it should be appreciated that when welding the stiffener 37 to the skin, the welding process is preferably a two beam welding process based on the characteristics of the skin and the stiffener 37. Double beam welding is a method of optically splitting one laser beam into two separate laser beams for welding. The two lasers are often divided into a high power laser and a lower power laser, and the lower power laser is used before, so that an advanced heat treatment can be formed on the welding part. That is, the stiffener 37 and the skin within the range of the low power laser should be in a state where heat radiation performance is low to maintain the condition of forming the advanced heat treatment; the stiffener 37 and the skin in the range of the high-power laser should be in a state with better heat dissipation performance so as to prevent the situation that the mechanical performance is reduced due to overheating of the weldment.
For the technical problems, the heat dissipation part 17 is designed to comprise a plurality of heat dissipation blocks 18 uniformly distributed along the reinforcing ribs 37, the heat preservation cavity 19 is arranged in the heat dissipation blocks 18, and heat is not easy to quickly lose by utilizing relatively static gas in the heat preservation cavity 19. 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 cooling block 18 and the cooling of the reinforcing ribs 37 and the skin are realized.
More specifically, the top surface of the heat dissipating plate 16 is provided with a mounting groove 21 opposite to the heat dissipating block 18, and the ventilation assembly 20 includes a push plate 22 slidably and sealingly connected to the heat insulating chamber 19. Under the action of the push plate 22, the heat preservation cavity 19 is divided into two cavities, namely: a first cavity 23 near the skin side and a second cavity 24 near the heat sink 16 side. The heat dissipation block 18 is provided with a pressure relief hole 25 for communicating the second cavity 24 with the outside. Obviously, the first cavity 23 is formed with a relatively airtight cavity.
An air bag 26 is arranged in the mounting groove 21, and an air exchanging pipe 27 and an air supplementing pipe 33 are respectively communicated with the air bag 26. Wherein, the ventilation pipe 27 extends to one side of the heat dissipation block 18 and sequentially penetrates through the cavity II 24 and the push plate 22 to extend into the cavity I23; the air supplementing pipe 33 is directly communicated with the outside. In more detail, the end part of the ventilation pipe 27 extending into the first cavity 23 is provided with an air outlet hole 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 hole 28, the blocking part 29 can block the air outlet hole 28, so that the air outlet hole 28 is in a closed state; the air supplementing pipe 33 is internally provided with a one-way valve which is used for controlling air to flow into the air bag 26 in a one-way so as to realize the air supplementing action of the air bag 26.
In addition, the heat dissipation block 18 is further provided with an exhaust hole 30 for communicating the first cavity 23 with the outside, and the push plate 22 is correspondingly provided with a sealing part 31, when the sealing part 31 is opposite to the exhaust hole 30, the sealing part 31 seals the air outlet 28, so that the air outlet 28 is in a sealing state.
And the push plate 22 is provided with a push rod 32 extending to one side of the airbag 26, and the closing portion 31 and the exhaust hole 30 are offset such that the exhaust hole 30 is opened by the same distance as the closing portion 29 and the exhaust hole 28 are offset such that the exhaust hole 28 is opened by the same distance.
Based on the above arrangement, the heat dissipation process of the tooling during welding operation of applying 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 respectively opposite to the adjacent radiating blocks 18. The heat dissipating block 18 opposite to the area with lower heat, namely the heat dissipating block 18 opposite to the skin and the reinforcing ribs 37 need to be heat treated in advance, and the heat dissipating block 18 is in a heat retaining state under the action of the heat insulating cavity 19 due to the lower heat conducted by the heat dissipating block 18, so that the skin and the reinforcing ribs 37 in the area are kept to form the condition of heat treatment in advance.
The heat dissipating block 18 corresponding to the high-power laser conducts a larger amount of heat, and because the first cavity 23 is in a sealed state, the air in the first cavity 23 is heated and expands, so that the push plate 22 is driven to slide towards the air bag 26. In the process, the push rod 32 presses the air bag 26, and the air in the air bag 26 is pressed into the ventilation tube 27. At this time, since the air outlet hole 28 of the ventilation tube 27 is blocked by the blocking portion 29, a large air pressure is generated in the ventilation tube 27. With the continuous sliding of the push plate 22, the sealing part 31 will be gradually dislocated from the exhaust hole 30, and the blocking part 29 will be gradually dislocated from the air outlet hole 28. Until the exhaust hole 30 and the air outlet hole 28 are opened at the same time, the air with lower temperature in the air exchanging pipe 27 is filled into the first cavity 23, so that the air with higher temperature in the first cavity 23 is discharged to the outside through the exhaust hole 30.
Further, the air supply tube 33 supplies air to the air bag 26, and the first chamber 23 is not filled because the air with the lower temperature is filled in the first chamber 23. The inflated air bag 26 will push the push plate 22 back to the initial position, thereby realizing the purpose that the ventilation assembly 20 continuously ventilates the heat preservation cavity 19 to dissipate heat of the reinforcing ribs 37 and the skin in the range of the high-power laser. In other words, in this case, the air in the heat-retaining chamber 19 serves as a heat-radiating effect of absorbing heat and then discharging the heat to the outside under the action of 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 via the blocking tube 35. The air outlet hole 28 is arranged on the side wall of the air exchanging pipe 27, the air exchanging pipe 27 and the blocking pipe 35 have matched sizes, and the blocking pipe 35 can block the air outlet hole 28; the sealing part 31 comprises a sealing plate 36, and the sealing 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 sealing plate 36 is opposite to the exhaust hole 30.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (7)
1. A frock that is used for skin test piece double beam welding strengthening rib, characterized by: the novel reinforced plastic composite material comprises a base (1), wherein a supporting component (2) is arranged on the base (1), a molded surface (3) is constructed on the supporting component (2), a skin is attached to the molded surface (3), a plurality of beam components (4) are further arranged on the base (1), the beam components (4) are arranged above the skin in a crossing mode, reinforcing ribs are connected to the beam components (4), positioning parts (5) are arranged on the beam components (4), and the reinforcing ribs can be abutted to the surface of the skin by the positioning parts (5);
the support assembly (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;
the heat dissipation part (17) comprises a plurality of heat dissipation blocks (18) distributed along the reinforcing ribs, a heat preservation cavity (19) is formed in the heat dissipation blocks (18), a ventilation assembly (20) is arranged in the heat preservation cavity (19), and the ventilation assembly (20) can discharge high-temperature gas in the heat preservation cavity (19) to the outside;
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) which is connected in the heat preservation cavity (19) in a sealing sliding manner, the push plate (22) divides the heat preservation cavity (19) into a first cavity (23) close to one side of a skin and a second cavity (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 (24) in a penetrating manner, and the pressure relief hole (25) is communicated with the outside;
an air bag (26) is arranged in the mounting groove (21), an air exchanging pipe (27) is communicated with the air bag (26), the air exchanging pipe (27) penetrates through the push plate (22) and stretches into the first cavity (23), an air outlet hole (28) is formed in the end part of the air exchanging 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 hole (28), the air outlet hole (28) is closed;
the heat dissipation block (18) is further provided with an exhaust hole (30) communicated with the first cavity (23) in a penetrating mode, the exhaust hole (30) is communicated with the outside, the push plate (22) is further provided with a sealing part (31), and when the sealing part (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 to one side of the air bag (26);
when the push plate (22) slides to one side of the air bag (26), the push rod (32) extrudes the air bag (26) and enables air in the air bag (26) to be pressed into the air exchanging pipe (27), the sealing part (31) and the air outlet (30) are staggered so that the opening distance of the air outlet (30) is the same as the opening distance of the sealing part (29) and the air outlet (28) so that the air outlet (28) is opened, the air bag (26) is further provided with an air supplementing pipe (33) communicated with the outside, and a valve body (34) for controlling the air to flow in a unidirectional way into the air bag (26) is arranged in the air supplementing pipe (33);
the blocking portion (29) includes a blocking tube (35).
2. The tooling for double-beam welding of reinforcing ribs of skin test pieces according to claim 1, wherein the tooling is characterized in that: the supporting component (2) comprises a plurality of supporting plates (6) which are arranged in a crisscross mode, a mounting surface (7) is constructed on each supporting plate (6), and a plurality of the mounting surfaces (7) are matched to form the molded surface (3).
3. The tooling for double-beam welding of reinforcing ribs of skin test pieces according to claim 1, wherein the tooling is characterized in that: 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. A tooling for double beam welding of skin test pieces with stiffeners according to claim 3, and characterized in that: the positioning part (5) comprises a plurality of positioning screws (10) which are connected with the connecting plate (8) in a threaded mode, and the plurality of positioning screws (10) are uniformly distributed along the reinforcing ribs.
5. The tooling for double-beam welding of the reinforcing ribs of the skin test piece according to claim 4, wherein the tooling is characterized in that: a plurality of guide grooves (11) are formed in the connecting plate (8), the guide grooves (11) extend to one side of the reinforcing ribs, and the positioning screws (10) are matched in the guide grooves (11).
6. The tooling for double-beam welding of reinforcing ribs of skin test pieces according to claim 1, wherein the tooling is characterized in that: the base (1) is further provided with a plurality of compression assemblies (12), the compression assemblies (12) are arranged above the skin in a straddling mode, the compression assemblies (12) are provided with compression portions (13), and the compression portions (13) can tightly prop the skin against the molded surface (3).
7. The tooling for double-beam welding of the reinforcing ribs of the skin test piece according to claim 6, wherein the tooling is characterized in that: the compression assembly (12) comprises a mounting plate (14), the compression part (13) comprises compression screws (15) which are connected to the mounting plate (14) in a threaded mode, and the compression screws (15) are evenly distributed along the skin.
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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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| CN115740811B true CN115740811B (en) | 2023-04-28 |
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