A special-shaped complex curved surface bonding tool and processing method thereof

Abstract

The present invention discloses a tool for gluing special-shaped complex curved surfaces and a processing method thereof, comprising a tool body for supporting parts and a clamping member for fixing parts; the tool body comprises a plurality of horizontal petals, the plurality of horizontal petals are distributed hierarchically from top to bottom, and two adjacent horizontal petals are fixedly connected; the horizontal petals comprise an arc portion and a straight portion, and the arc portion and the straight portion are fixedly connected. The tool of the present invention is processed in steps, and independent arc portions and straight portions are obtained by CNC milling. The tool body is formed by two assembly processes. When the horizontal petals are assembled to form the tool body, the assembly process of each layer of horizontal petals is carried out on the same reference plane, which can reduce the error of the forming process; the split processing and then welding forming can reduce the processing difficulty of the tool body and save materials at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft parts processing equipment, and in particular to a special-shaped complex curved surface bonding tool and a processing method thereof. Background Art

[0002] At present, composite materials have been widely used in aviation, aerospace, automobile and other fields due to their excellent properties such as high specific strength, high specific modulus, designability and fatigue resistance.

[0003] Composite materials typically consist of an inner skin, an outer skin, and a honeycomb panel. The honeycomb panel is sandwiched between the inner and outer skins, and the three are glued together. The gluing process requires a gluing fixture for support and fixation. Existing gluing fixtures are integrally cast. This structure and molding method have the following drawbacks: The integral casting results in a solid fixture, which is heavy and difficult to transport and maintain. A hollow fixture would increase the design and manufacturing costs of the tooling. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a special-shaped complex curved surface bonding tool and a processing method thereof. The tool is processed in steps, and independent arc parts and straight parts are obtained by CNC milling. The tool body is formed by two assembly processes. When the horizontal petals are assembled to form the tool body, the assembly process of each layer of horizontal petals is carried out on the same reference plane, which can reduce the error of the forming process; the split processing and then welding forming can reduce the processing difficulty of the tool body and save materials at the same time.

[0005] The object of the present invention is achieved through the following technical solutions:

[0006] A tool for gluing special-shaped and complex curved surfaces, comprising a tool body for supporting parts and a pressing member for fixing the parts;

[0007] The tooling body comprises a plurality of horizontal petals, the plurality of horizontal petals are distributed in layers from top to bottom, and two adjacent horizontal petals are fixedly connected;

[0008] The horizontal petal comprises an arc portion and a straight portion, and the arc portion and the straight portion are fixedly connected;

[0009] The arc-shaped portion and the straight portion each include an outer panel and an inner supporting rib. The outer panels of the arc-shaped portion and the straight portion form a supporting profile that is adapted to the shape of the part and is hollow inside. The inner supporting rib is arranged inside the outer panel.

[0010] After the multiple arc-shaped parts and the multiple straight-line parts are separately formed, they are fixed as a whole to form an integrated tooling body.

[0011] Furthermore, the outer panel at the bottom layer is provided with an assembly lug, and the assembly lug is provided with a threaded hole.

[0012] Furthermore, it also includes a base, and the tooling body is detachably connected to the base through assembly ear plates, threaded holes, and bolts.

[0013] Furthermore, the pressing member includes a pressing plate assembly and a bracket assembly, the bracket assembly is arranged on the base, the pressing plate assembly is detachably connected to the base through the bracket assembly, and the pressing plate assembly is used to press the parts onto the tooling body.

[0014] Furthermore, the pressure plate assembly includes an arc-shaped pressure plate and a linear pressure plate, the arc-shaped pressure plate is an integrated structure, the arc-shaped pressure plate is provided with an arc-shaped pressing groove adapted to the outer panel of the arc-shaped portion, the linear pressure plate includes a first straight plate and a second straight plate, the tops of the first straight plate and the second straight plate are provided with connecting ear plates, and a linear pressing groove adapted to the outer panel of the linear portion is formed between the first straight plate and the second straight plate;

[0015] The bracket assembly includes an arc-shaped bracket and a straight bracket, the arc-shaped bracket includes two arc-shaped supports, the two arc-shaped supports are detachably connected to the base, the two arc-shaped supports are symmetrically arranged on both sides of the arc portion, the bottom of the arc-shaped pressure plate is plugged into the arc-shaped supports, and the arc-shaped pressure plate and the arc-shaped supports are fixed by a pin;

[0016] The linear bracket includes a top fixing frame, two first linear supports and two second linear supports. The fixing frame is connected to the base. The two first linear supports are detachably connected to the base. The two first linear supports are symmetrically arranged on both sides of the linear portion. The two second linear supports are connected to the top fixing frame, and the two second linear supports are located on both sides of the linear portion and correspond to the two first linear supports up and down. The top of the linear pressure plate is fixed by a connecting ear plate and two second linear supports, and the bottom of the linear pressure plate is fixed by two first linear supports.

[0017] Furthermore, four eye screws are provided on the base.

[0018] Furthermore, the connecting surface between two adjacent horizontal petals is an arc-shaped surface.

[0019] A method for processing a special-shaped complex curved surface bonding tool comprises the following steps:

[0020] S10, separate forming of the arc portion and the straight portion and forming of the pressing member: separate forming is performed to obtain an independent arc portion and an independent straight portion;

[0021] S20, horizontal petal forming: fixing the arc portion and the corresponding straight portion processed in step S10 to obtain a plurality of horizontal petals;

[0022] S30, tooling body forming: (1) using the top surface of the largest horizontal petal as the forming reference, the second largest horizontal petal is fixedly connected to the largest horizontal petal to form a first reference body; (2) the third largest horizontal petal is fixedly connected to the first reference body to form a second reference body; repeat steps (1) and (2) until an integrated tooling body is formed;

[0023] S40, tooling body finishing: the tooling body in step S30 is subjected to CNC milling finishing to obtain a tooling body with a smooth surface.

[0024] Furthermore, in step S10, the arc portion and the straight portion are formed by CNC milling.

[0025] The beneficial effects of the present invention are:

[0026] The tooling of the present invention is processed in steps, and independent arc parts and straight parts are obtained by CNC milling. The tooling body is formed by two assemblies. When the horizontal petals are assembled to form the tooling body, the assembly process of each layer of horizontal petals is carried out on the same reference plane, which can reduce the error of the forming process; the split processing and then welding forming can reduce the processing difficulty of the tooling body and save materials at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a front view of a tool for gluing special-shaped and complex curved surfaces according to an embodiment of the present invention;

[0028] Figure 2 A top view of a tool for gluing special-shaped and complex curved surfaces according to an embodiment of the present invention;

[0029] Figure 3 A side view of a tool for gluing special-shaped and complex curved surfaces according to an embodiment of the present invention;

[0030] Figure 4 Schematic diagram of the structure of the tooling body;

[0031] Figure 5 This is the exploded view of the tooling body;

[0032] Figure 6 Schematic diagram of the structure of the pressure plate assembly;

[0033] In the figure, 1. tooling body; 2. clamping member; 3. horizontal petal; 4. arc-shaped portion; 5. straight portion; 6. exterior panel; 7. inner supporting rib; 8. assembly ear plate; 9. pressure plate assembly; 10. bracket assembly; 11. arc-shaped pressure plate; 12. straight pressure plate; 13. arc-shaped clamping groove; 14. straight clamping groove; 15. arc-shaped support; 16. fixing frame; 17. first straight support; 18. second straight support; 19. lifting eye screw; 20. base. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention.

[0035] See Figures 1-6 , the present invention provides a technical solution:

[0036] Example 1:

[0037] like Figures 1-6 As shown, a tool for bonding special-shaped complex curved surfaces and a processing method thereof include a tool body 1 for supporting parts and a pressing member 2 for fixing parts;

[0038] The tooling body 1 includes a plurality of horizontal petals 3, which are distributed in layers from top to bottom, and two adjacent horizontal petals 3 are fixedly connected;

[0039] The horizontal petal 3 includes an arc portion 4 and a straight portion 5, and the arc portion 4 and the straight portion 5 are fixedly connected;

[0040] like Figure 5 As shown, the arc-shaped portion 4 and the straight portion 5 each include an outer panel 6 and an inner supporting rib 7. The outer panels of the arc-shaped portion 4 and the straight portion 5 form a supporting profile that is adapted to the shape of the part and is hollow inside. The inner supporting rib 7 is arranged inside the outer panel 6.

[0041] The multiple arc-shaped portions 4 and the multiple straight portions 5 are separately formed and then fixed as a whole to form an integrated tooling body 1 .

[0042] When machining the tooling body 1, (1) firstly, a plurality of independent straight portions 5 and arc portions 4 are rough-machined by CNC milling. In this embodiment, the number of straight portions 5 and arc portions 4 is both 4.

[0043] (2) After the straight portion 5 and the arc portion 4 are processed, the horizontal petal 3 is assembled. Specifically, the arc portion 4 and the straight portion 5 corresponding to the same layer are welded and fixed to form the horizontal petal 3. During welding, the end face of the outer panel 6 of the arc portion 4 is butted against the end face of the outer panel 6 of the straight portion 5 and then welded. The connecting surface between the two is a plane (bevel). Plane welding can reduce the difficulty of welding.

[0044] (3) After the horizontal petals 3 are formed, they are assembled as a whole to form the tooling body 1. Specifically, the bottom (largest) horizontal petal 3 is welded as a reference. The bottom surface of the upper (second largest) horizontal petal 3 is welded against the top surface of the bottom horizontal petal 3 to form a first reference body (wherein, when two horizontal petals 3 are welded, the two arc-shaped portions 4 correspond to each other vertically, and the two straight portions 5 correspond to each other vertically). The third largest horizontal petal 3 is welded to the first reference body to form a second reference body. The above steps are repeated until the integrated tooling body 1 is formed.

[0045] (4) After the tooling body 1 is formed, the entire tooling body 1 is subjected to CNC milling to ensure that the surface accuracy and surface roughness of the tooling body 1 meet the requirements, and that the tooling surface is flat and smooth without obvious knife marks or scratches.

[0046] The tooling of the present invention is processed in steps, and independent arc portions 4 and straight portions 5 are obtained by CNC milling. The tooling body 1 is formed by two assemblies. When the horizontal petals 3 are assembled to form the tooling body 1, the assembly process of each layer of the horizontal petals 3 is carried out on the same reference plane, which can reduce the error of the forming process; the split processing and then welding forming can reduce the processing difficulty of the tooling body 1 and save materials at the same time.

[0047] Furthermore, the outer panel 6 at the bottom layer is provided with an assembly lug 8 , and the assembly lug 8 is provided with a threaded hole.

[0048] It also includes a base 20, and the tool body 1 is detachably connected to the base 20 through an assembly lug 8, threaded holes, and bolts. The assembly lug 8 is used to connect to the base 20, facilitate the fixation of the tool, and ensure the stability of the tool during part molding.

[0049] Further, if Figure 1-Figure 3 and Figure 6 As shown, the clamping member 2 includes a pressure plate assembly 9 and a bracket assembly 10. The bracket assembly 10 is arranged on the base 20. The pressure plate assembly 9 is detachably connected to the base 20 through the bracket assembly 10. The pressure plate assembly 9 is used to press the parts on the tooling body 1.

[0050] Further, if Figure 1-Figure 3 and Figure 6As shown, the pressure plate assembly 9 includes a curved pressure plate 11 and a linear pressure plate 12. The curved pressure plate 11 is an integrated structure. The curved pressure plate 11 is provided with a curved pressing groove 13 adapted to the outer panel 6 of the curved portion 4. The linear pressure plate 12 includes a first straight plate and a second straight plate. Connecting ear plates are provided on the tops of the first straight plate and the second straight plate. A linear pressing groove 14 adapted to the outer panel 6 of the straight portion 5 is formed between the first straight plate and the second straight plate.

[0051] The bracket assembly 10 includes an arc-shaped bracket and a straight bracket. The arc-shaped bracket includes two arc-shaped supports 15. The two arc-shaped supports 15 are detachably connected to the base 20. The two arc-shaped supports 15 are symmetrically arranged on both sides of the arc-shaped portion 4. The bottom of the arc-shaped pressure plate 11 is plugged into the arc-shaped supports 15. The arc-shaped pressure plate 11 and the arc-shaped supports 15 are fixed by a latch. (It should be noted that the arc-shaped bracket here does not refer to the bracket being arc-shaped, but refers to the bracket corresponding to the arc-shaped bracket and the arc-shaped portion 4. The arc-shaped pressure plate 11 does not refer to the arc-shaped pressure plate, but refers to the pressure plate that is adapted to the parts corresponding to the arc-shaped pressing groove 13 and the arc-shaped portion 4. The same applies to the rest.)

[0052] The linear bracket includes a top fixing frame 16, two first linear supports 17 and two second linear supports 18. The fixing frame 16 is connected to the base 20. The two first linear supports 17 are detachably connected to the base 20. The two first linear supports 17 are symmetrically arranged on both sides of the straight portion 5. The two second linear supports 18 are connected to the top fixing frame 16, and the two second linear supports 18 are located on both sides of the straight portion 5 and correspond to the two first linear supports 17 up and down; the top of the linear pressure plate 12 is fixed by a connecting ear plate and two second linear supports 18, and the bottom of the linear pressure plate 12 is fixed by two first linear supports 17.

[0053] Among them, ear plates are provided at the bottom of the arc-shaped pressing plate 11 and the straight pressing plate 12, and the ear plates are fixed with the supports through pins after being clamped.

[0054] Among them, two arc-shaped pressure plates 11 and corresponding arc-shaped brackets are provided, which are respectively distributed at the front end and the middle part of the tooling body 1; the linear pressure plate 12 and the linear bracket are provided at the tail part of the tooling body 1, so that the workpiece can be fixed by pressing at three points (surfaces) at the head, middle and tail, which can ensure the stability of the skin and the honeycomb when being glued.

[0055] The arc-shaped support 15 is detachably connected to the base 20 by bolts, and the arc-shaped pressing plate 11 is fixed to the arc-shaped support 15 by means of latches after being plugged into the arc-shaped support 15 .

[0056] Since the linear pressure plate 12 is located at the tail of the tooling, which is the highest point of the tooling, the linear pressure plate 12 is processed into a split structure consisting of a first linear plate and a second linear plate. The fixing frame 16 is detachably connected to the base 20 by bolts, the second linear support 18 is fixed to the fixing frame, and the first linear support 17 is detachably connected to the base 20 by bolts. The upper and lower ends of the first linear plate are respectively connected by the corresponding upper and lower first linear supports 17 and second linear supports 18 and then fixed by pins. The second linear plate is fixed in the same way. The design of the split linear pressure plate 12 can reduce the processing difficulty of the linear pressure plate 12 and avoid deformation during overall processing.

[0057] Furthermore, if Figure 1 As shown, four eye screws 19 are provided on the base 20. The eye screws 19 are provided to facilitate the transportation of the base 20.

[0058] Furthermore, if Figure 5 As shown, the connecting surface between two adjacent horizontal petals 3 is an arc surface. Using an arc surface as the connecting surface can increase the contact area between adjacent horizontal petals 3, thereby increasing the number of welding points and improving the stability of the connection between the two.

[0059] Example 2:

[0060] This embodiment is a method for processing the special-shaped complex curved surface bonding tool in Example 1, comprising the following steps:

[0061] S10, separate molding of the arcuate portion 4 and the straight portion 5 and molding of the pressing member 2: separate molding to obtain an independent arcuate portion 4 and an independent straight portion 5;

[0062] S20, forming the horizontal petals 3: fixing the arc-shaped portion 4 and the corresponding straight portion 5 processed in step S10 to obtain a plurality of horizontal petals 3;

[0063] S30, forming the tooling body 1: (1) using the top surface of the largest horizontal petal 3 as the forming reference, the second largest horizontal petal 3 is fixedly connected to the largest horizontal petal 3 to form a first reference body; (2) the third largest horizontal petal 3 is fixedly connected to the first reference body to form a second reference body; repeat steps (1) and (2) until an integrated tooling body 1 is formed;

[0064] S40 , finishing the tooling body 1 : The tooling body 1 in step S30 is finished by CNC milling as a whole to obtain a tooling body 1 with a smooth surface.

[0065] The connecting surfaces between the horizontal petals are in the horizontal direction, and the connecting surfaces between the shaped portion and the straight portion are in the vertical direction.

[0066] Furthermore, in step S10, the arc portion and the straight portion are formed by CNC milling.

[0067] The foregoing description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Rather, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the appended claims.

Claims

1. A tool for gluing special-shaped and complex curved surfaces, characterized by: It includes a tooling body for supporting parts and a pressing member for fixing parts; The tooling body comprises a plurality of horizontal petals, the plurality of horizontal petals are distributed in layers from top to bottom, and two adjacent horizontal petals are fixedly connected; The horizontal petal comprises an arc portion and a straight portion, and the arc portion and the straight portion are fixedly connected; The arc-shaped portion and the straight portion each include an outer panel and an inner supporting rib. The outer panels of the arc-shaped portion and the straight portion form a supporting profile that is adapted to the shape of the part and is hollow inside. The inner supporting rib is arranged inside the outer panel. After the multiple arc-shaped parts and the multiple straight-line parts are separately formed, they are fixed as a whole to form an integrated tooling body; The outer panel at the bottom layer is provided with an assembly lug, and the assembly lug is provided with a threaded hole; It also includes a base, and the tooling body is detachably connected to the base through assembly ear plates, threaded holes, and bolts; The pressing member includes a pressing plate assembly and a bracket assembly, wherein the bracket assembly is arranged on the base, the pressing plate assembly is detachably connected to the base via the bracket assembly, and the pressing plate assembly is used to press the part onto the tooling body; The pressure plate assembly includes an arc-shaped pressure plate and a linear pressure plate. The arc-shaped pressure plate is an integrated structure. The arc-shaped pressure plate is provided with an arc-shaped pressing groove adapted to the outer panel of the arc-shaped portion. The linear pressure plate includes a first straight plate and a second straight plate. Connecting ear plates are provided on the tops of the first straight plate and the second straight plate. A linear pressing groove adapted to the outer panel of the linear portion is formed between the first straight plate and the second straight plate. The bracket assembly includes an arc-shaped bracket and a straight bracket, the arc-shaped bracket includes two arc-shaped supports, the two arc-shaped supports are detachably connected to the base, the two arc-shaped supports are symmetrically arranged on both sides of the arc portion, the bottom of the arc-shaped pressure plate is plugged into the arc-shaped supports, and the arc-shaped pressure plate and the arc-shaped supports are fixed by a pin; The linear bracket includes a top fixing frame, two first linear supports and two second linear supports. The fixing frame is connected to the base. The two first linear supports are detachably connected to the base. The two first linear supports are symmetrically arranged on both sides of the linear portion. The two second linear supports are connected to the top fixing frame, and the two second linear supports are located on both sides of the linear portion and correspond to the two first linear supports up and down. The top of the linear pressure plate is fixed by a connecting ear plate and two second linear supports, and the bottom of the linear pressure plate is fixed by two first linear supports.

2. The special-shaped complex curved surface bonding tool according to claim 1, characterized in that: Four eye screws are provided on the base.

3. The special-shaped complex curved surface bonding tool according to claim 1, characterized in that: The connecting surface between two adjacent horizontal petals is an arc-shaped surface.

4. A method for processing the tooling according to any one of claims 1 to 3, characterized in that: The steps include: S10, separate forming of the arc portion and the straight portion and forming of the pressing member: separate forming is performed to obtain an independent arc portion and an independent straight portion; S20, horizontal petal forming: fixing the arc portion and the corresponding straight portion processed in step S10 to obtain a plurality of horizontal petals; S30, tooling body forming: (1) using the top surface of the largest horizontal petal as the forming reference, the second largest horizontal petal is fixedly connected to the largest horizontal petal to form a first reference body; (2) the third largest horizontal petal is fixedly connected to the first reference body to form a second reference body; repeat steps (1) and (2) until an integrated tooling body is formed; S40, tooling body finishing: the tooling body in step S30 is subjected to CNC milling finishing to obtain a tooling body with a smooth surface.

5. The processing method according to claim 4, characterized in that: In step S10 , the arc portion and the straight portion are formed by CNC milling.

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