Composite skin forming tool

Abstract

The invention relates to the field of process equipment, in particular to a composite skin forming tool. The tool comprises a plurality of die body blocks, a glue joint positioning clamping plate, an upper flange edge, a lower flange edge, an upper flange support, a lower flange support and a frame. Wherein the plurality of die body sub-blocks are of special-shaped cylindrical structures, the molded surface of a structure formed by the plurality of die body sub-blocks has multiple curvatures and multiple bends, the upper flange edge is fixed on the upper flange support, the lower flange edge is fixed on the lower flange support, one end of the glue joint positioning clamping plate is connected with the plurality of die body sub-blocks, and the other end of the glue joint positioning clamping plate is connected with the die body sub-blocks. The other end of the glue joint positioning clamping plate is connected with the frame, one ends of the mold body sub-blocks are connected with the upper flange edge, the other ends of the mold body sub-blocks are connected with the lower flange edge, and the problems that in the prior art, a special-shaped pipeline structure skin is difficult to demold and difficult to lay are solved.

Description

Technical Field

[0001] The present invention relates to the field of process equipment, and in particular to a composite skin forming tool. Background Art

[0002] The molding tool is a process equipment used for autoclave molding of composite parts. It transfers the heat and pressure of the autoclave during the curing process to obtain parts with high dimensional accuracy.

[0003] At present, most of the existing conventional composite skin molding tooling is panel-type open, with a simple structure and a relatively regular mold surface. There are relatively few issues that need to be considered and avoided in the design of part molding and demolding solutions. However, when it comes to skinning special-shaped pipe structures, existing conventional composite skins usually use negative mold molding, that is, non-pneumatic surface molding, but pneumatic surface bagging. Although this reduces the difficulty of demolding, it increases the difficulty of workers' prepreg laying operations. At the same time, the molding quality of the bagging surface cannot be guaranteed. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a composite skin forming tool, which can meet the requirements of special-shaped pipeline structure skin forming, and solve the problems of difficulty in demoulding and laying of special-shaped pipeline structure skin.

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

[0006] The present invention provides a composite skin forming tool, which includes: a plurality of mold blocks, a glued positioning card plate, an upper flange edge, a lower flange edge, an upper flange bracket, a lower flange bracket, and a frame; wherein, the plurality of mold blocks are all in a special-shaped cylindrical structure, and the mold surface of the structure jointly formed by the plurality of mold blocks has multiple curvatures and multiple bends, the upper flange edge is fixed to the upper flange bracket, the lower flange edge is fixed to the lower flange bracket, one end of the glued positioning card plate is connected to the plurality of mold blocks, the other end of the glued positioning card plate is connected to the frame, one end of the plurality of mold blocks is connected to the upper flange edge, and the other end of the plurality of mold blocks is connected to the lower flange edge.

[0007] Furthermore, each of the plurality of mold body blocks is provided with a same draft angle.

[0008] Furthermore, the upper flange bracket is perpendicular to the surface of the frame, and the upper flange bracket is fixed to the frame through a column.

[0009] Furthermore, the lower flange edge is flatly fixed on the lower flange bracket, the lower flange bracket is in a rectangular structure and the interior of the rectangular structure is hollowed out, and the lower flange bracket is vertically fixed on the frame.

[0010] Furthermore, a forklift hole and a lifting ring are arranged inside the frame, and a measurement reference hole is arranged on the top flat plate of the frame.

[0011] Furthermore, the composite skin forming tooling also includes a plurality of drilling templates, each of which is provided with a drilling template hole, and a drill sleeve is installed in the drilling template hole and fixedly connected to the upper flange bracket or the lower flange bracket.

[0012] Furthermore, the composite skin forming tooling also includes an upper paving card plate, which is arranged on the upper flange edge and is a movable positioning block.

[0013] Furthermore, the composite skin forming tooling also includes a lower paving card plate, which is arranged on the lower flange edge and is a movable positioning block.

[0014] Furthermore, the composite skin forming tooling also includes a first support block, and the outer surface of the first support block is in contact with the inner cavity of the mold block.

[0015] Furthermore, the composite skin forming tooling also includes a second support block, and the outer surface of the second support block is in contact with the bottom of the mold block.

[0016] The composite skin forming tool of the present invention is different from the common straight-cylindrical skin in the prior art. The composite skin forming tool of the present invention is a special-shaped cylindrical structure, that is, the mold surface of the structure has multiple curvatures and multiple bends. In addition, since the pipeline space of the special-shaped cylindrical structure is narrow, the composite skin forming tool of the present invention adopts a positive mold forming method, which can realize manual paving, and solves the technical problem that manual paving cannot be performed due to the negative mold forming method in the prior art. At the same time, the composite skin forming tool of the present invention adopts a clever block design, that is, a plurality of mold blocks are used to jointly form the pipeline forming area of ​​the composite skin forming tool, thereby solving the problem that the special-shaped pipeline skin is difficult to demold and difficult to pave in the prior art. At the same time, the composite skin forming tool of the present invention effectively solves the technical problem of tooling co-curing bonding by setting a bonding positioning card plate, effectively improves the bonding quality, and obtains good results in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 This is a structural diagram of the composite skin forming tooling of the present invention from a top view angle;

[0019] Figure 2 This is a structural diagram of the composite skin forming tooling of the present invention from a bottom-up perspective;

[0020] Figure 3 It is a schematic diagram of the support surface of the inner cavity support block of the composite skin forming tool of the present invention;

[0021] The accompanying drawings are marked as follows: the first mold block 1, the second mold block 2, the third mold block 3, the fourth mold block 4, the fifth mold block 5, the sixth mold block 6, the seventh mold block 7, the glued positioning clamping plate 8, the upper flange edge 9, the lower flange edge 10, the upper flange bracket 11, the lower flange bracket 12, the frame 13, the first drilling template 14, the second drilling template 15, the third drilling template 16, the upper paving clamping plate 17, the lower paving clamping plate 18, the first support block 19, and the second support block 20. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0023] like Figures 1 to 3 As shown, a composite skin molding tool in an embodiment of the present invention is a process equipment for autoclave molding of composite parts. Different from the common straight-cylindrical skin in the prior art, the composite skin molding tool of the present invention is a special-shaped cylindrical structure, that is, the mold surface of the structure has multiple curvatures and multiple bends, and there are flange edges (i.e., upper flange edge 9 and lower flange edge 10) at both ends for connection and assembly. The structure is complex and poses considerable challenges in tool design and tool manufacturing. The composite skin molding tool of the present invention is a tool that meets the requirements for special-shaped pipe skin molding and performance in terms of usability and operability.

[0024] A composite skin forming tooling according to an embodiment of the present invention comprises: a plurality of mold blocks, a glued positioning clamp 8, an upper flange edge 9, a lower flange edge 10, an upper flange bracket 11, a lower flange bracket 12, and a frame 13, wherein the plurality of mold blocks are all in a special-shaped cylindrical structure, and the mold surface of the structure jointly formed by the plurality of mold blocks has multiple curvatures and multiple bends. In the present embodiment, the plurality of mold blocks respectively include a first mold block 1, a second mold block 2, a third mold block 3, a fourth mold block 4, a fifth mold block 5, a sixth mold block 6, and a seventh mold block 7. The composite skin forming tooling of the present invention divides the forming area into 9 blocks, the pipe forming area is divided into 7 blocks (respectively, the first mold block 1, the second mold block 2, the third mold block 3, the fourth mold block 4, the fifth mold block 5, the sixth mold block 6, and the seventh mold block 7), and the flange edges of the pipe connection at both ends are formed in 1 block each (respectively, the upper flange edge 9 and the lower flange edge 10), one end of the multiple mold blocks is connected to the upper flange edge 9, and the other end of the multiple mold blocks is connected to the lower flange edge 10, wherein each of the multiple mold blocks is provided with the same draft angle for better and more convenient demolding. Of course, in other embodiments, the draft angle of each of the multiple mold blocks may also be set differently, which is not limited here.

[0025] In this embodiment, the materials of the first mold block 1, the second mold block 2, the third mold block 3, the fourth mold block 4, the fifth mold block 5, the sixth mold block 6, and the seventh mold block 7 are all Q235 steel, and are screwed together and positioned on the upper flange edge 9 and the lower flange edge 10 at both ends by φ8X24 internal threaded cylindrical pins and M8X16 screws.

[0026] In this embodiment, one end of the glued positioning card plate 8 is connected to a plurality of mold blocks, and the other end of the glued positioning card plate 8 is connected to the frame 13. Specifically, the material of the glued positioning card plate 8 is Q235 steel, and the parts to be glued are positioned on the glued positioning card plate 8 through the surface and the pin holes. The glued positioning card plate 8 sets the bagging area on the elongated circular tube by round tube welding, and the circular tube is screwed and positioned and fixed on the frame 13 through the base with a φ8X20 bent handle pin and M8X20 screws.

[0027] In this embodiment, the upper flange edge 9 is fixed on the upper flange bracket 11, and the lower flange edge 10 is fixed on the lower flange bracket 12. Specifically, the upper flange edge 9 is made of Q235 steel, and after fine processing, it is screwed and positioned and fixed to the upper flange bracket 11 by φ8X22 cylindrical pins and M8X12 screws. The lower flange edge 10 is made of Q235 steel, and after fine processing, it is screwed and positioned and fixed to the lower flange bracket 12 by φ8X22 cylindrical pins and M8X12 screws.

[0028] In this embodiment, the upper flange bracket 11 is perpendicular to the surface of the frame 13, and the upper flange bracket 11 is fixed to the frame 13 through a column (for example, an L-shaped column). Specifically, the upper flange bracket 11 is made of Q235 steel, and a flange steel plate and a square tube are welded into a column, which is screwed and positioned and fixed to the frame 13 through a φ8X20 bent handle pin and an M8X20 screw.

[0029] In this embodiment, the lower flange edge 10 is flatly fixed on the lower flange bracket 12. The lower flange bracket 12 has a rectangular structure and the interior of the rectangular structure is hollowed out. The lower flange bracket 12 is vertically fixed on the frame 13. Specifically, the lower flange bracket 12 is made of Q235 steel. The lower flange bracket 12 is hollowed out to reduce weight and is fixed to the frame 13 by welding.

[0030] In this embodiment, forklift holes and lifting rings are provided inside the frame 13, and a measurement reference hole is provided on the top plate of the frame 13. Specifically, the material of the frame 13 is Q235 steel, and the profile is cut and welded into a whole, and the frame 13 includes forklift holes and lifting rings to facilitate transportation between tooling processes. The top plate of the frame 13 is designed with measurement reference holes, which are used for quality inspection after the tooling enters the factory and subsequent tooling repair. In addition to the top plane, the surface of the frame 13 is sprayed with high-temperature resistant (i.e. 250°C) silver powder paint for protection, and the tooling drawing number, product drawing number and actual weight of the tooling are marked with 100mm high red high-temperature resistant paint around the tooling frame.

[0031] In this embodiment, the composite skin forming tooling also includes multiple drilling templates, each of which is provided with drilling template holes. The drill sleeve is installed in the drilling template hole and fixedly connected to the upper flange bracket 11 or the lower flange bracket 12, wherein the multiple drilling templates include a first drilling template 14, a second drilling template 15, and a third drilling template 16.

[0032] Specifically, the material of the first drilling template 14 is Q235 steel. According to the given hole axis, a drilling template hole is made on the first drilling template 14, and a drill sleeve (for example, a HB standard drill sleeve with an inner diameter of 6mm) is installed in the drilling template hole, and screwed and positioned on the lower flange bracket 12 through a φ6X25 bent handle pin and an M8X25 screw.

[0033] Specifically, the material of the second drilling template 15 is Q235 steel. According to the given hole axis, a drilling template hole is made on the second drilling template 15, and a drill sleeve (for example, a HB standard drill sleeve with an inner diameter of 6mm) is installed in the drilling template hole, and screwed and positioned on the lower flange bracket 12 through a φ6X25 bent handle pin and an M8X25 screw.

[0034] Specifically, the material of the third drilling template 16 is Q235 steel. According to the given hole axis, a drilling template hole is made on the third drilling template 16, and a drill sleeve (for example, a HB standard drill sleeve with an inner diameter of 6mm) is installed in the drilling template hole, and screwed and positioned on the upper flange bracket 11 through a φ6X25 bent handle pin and an M8X25 screw.

[0035] In this embodiment, the composite skin forming tooling also includes an upper paving cardboard 17, which is arranged on the upper flange edge 9 and is a movable positioning block. Specifically, the upper paving cardboard 17 is made of Q235 steel and is used for positioning the product layer-dropping paving. It is a movable positioning block, and the layer-dropping paving of the upper flange of the product is completed by moving the upper paving cardboard 17.

[0036] In this embodiment, the composite skin forming tooling also includes a lower paving card plate 18, which is arranged on the lower flange edge 10 and is a movable positioning block. Specifically, the lower paving card plate 18 is made of Q235 steel and is used for positioning the product layer-dropping paving. It is a movable positioning block, and the layer-dropping paving of the product lower flange opening is completed by moving the lower paving card plate 18.

[0037] In this embodiment, the composite skin forming tooling also includes a first support block 19, and the outer surface of the first support block 19 fits with the inner cavity of the mold block. Specifically, the material of the first support block 19 is Q235 steel, and the outer surface of the first support block 19 fits with the inner cavity of the mold block, playing the role of supporting the mold block. Since the inner cavity of the pipeline is relatively narrow, the length is relatively long, and there are many mold blocks, the pressure used by the tooling during the curing process is 0.7Mpa, and the mold is easily squeezed into the inner cavity under pressure. The mold blocks are locked and positioned at both ends, resulting in the middle position of the mold being easily deformed under pressure. This technical problem can be well solved by adding the first support block 19, and it is screwed to the lower flange edge 10 by M8X25 screws.

[0038] In this embodiment, the composite skin forming tooling further includes a second support block 20, the outer surface of which is in contact with the bottom of the mold block. Specifically, the second support block 20 is made of Q235 steel, the outer surface of which is in contact with the bottom of the mold block, and plays a role in supporting and limiting the mold block, and is screwed to the upper flange edge 09 by M8X25 screws.

[0039] In this embodiment, all the tools are made of Q235 steel. The metal is suitable for various temperature ranges from low temperature to high temperature. Moreover, steel is a relatively cheap and durable material. Experience shows that steel tools can still produce good parts after 1500 autoclave curing cycles. However, due to the density of steel is 7850kg / m 3, very heavy, and its coefficient of thermal expansion (CTE) is larger than that of the carbon / epoxy composite parts made of it. The heating rate of the heavy tooling in the autoclave is relatively slow. In order to save curing time and allow the tooling to quickly reach the required curing temperature, the wall thickness of the tooling mold cannot be too thick. In this embodiment, the wall thickness of the special-shaped pipe of the composite skin molding tooling of the present invention is set to 15mm in consideration of the thermal expansion coefficient and its own weight. When the wall thickness is set to 15mm, the tooling becomes a hollow structure, and the composite skin needs to be demolded after curing and forming. The biggest tooling design problem of the special-shaped pipe skin is its demolding. When the normal direction along the flange edge is used as the demolding direction, there is a large closed angle, and the special-shaped pipe skin cannot be directly removed from the tooling. The composite skin forming tooling of the present invention performs demolding analysis on the tooling mold body, and then divides the mold body into blocks to form a first mold body block 1, a second mold body block 2, a third mold body block 3, a fourth mold body block 4, a fifth mold body block 5, a sixth mold body block 6, and a seventh mold body block 7. This makes it easy to demold the tooling mold body, and the block parts are provided with demolding angles for smooth demolding.

[0040] In this embodiment, the first mold block 1, the second mold block 2, the third mold block 3, the fourth mold block 4, the fifth mold block 5, the sixth mold block 6, and the seventh mold block 7 are assembled on the upper flange edge 9, positioned by pins, and fixed by threads. Then the lower flange edge 10 is assembled with the mold blocks. In order to facilitate the paving of special-shaped pipe composite skin tooling, it does not need to be installed on the frame, and it can be directly paved in this state and then cured. After the curing is completed and the tank is left to stand, the drilling template is installed in the corresponding position and holes are drilled to facilitate the assembly and positioning of the product. After drilling the holes, pull out all the pins and screws of the mold body, and then demold in the demoulding order, remove the mold body blocks one by one, and the demoulding work of the special-shaped pipe composite skin is completed.

[0041] The composite skin forming tool of the present invention is different from the common straight-cylindrical skin in the prior art. The composite skin forming tool of the present invention is a special-shaped cylindrical structure, that is, the mold surface of the structure has multiple curvatures and multiple bends. In addition, since the pipeline space of the special-shaped cylindrical structure is narrow, the composite skin forming tool of the present invention adopts a positive mold forming method, which can realize manual paving, and solves the technical problem that manual paving cannot be performed due to the negative mold forming method in the prior art. At the same time, the composite skin forming tool of the present invention adopts a clever block design, that is, a plurality of mold blocks are used to jointly form the pipeline forming area of ​​the composite skin forming tool, thereby solving the problem that the special-shaped pipeline skin is difficult to demold and difficult to pave in the prior art. At the same time, the composite skin forming tool of the present invention effectively solves the technical problem of tooling co-curing bonding by setting a bonding positioning card plate, effectively improves the bonding quality, and obtains good results in practical applications.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A composite skin forming tool, characterized in that: The composite skin forming tooling includes: multiple mold blocks, a glued positioning card plate, an upper flange edge, a lower flange edge, an upper flange bracket, a lower flange bracket, and a frame; wherein, the multiple mold blocks are all in a special-shaped cylindrical structure, and the mold surface of the structure jointly formed by the multiple mold blocks has multiple curvatures and multiple bends, the upper flange edge is fixed to the upper flange bracket, the lower flange edge is fixed to the lower flange bracket, one end of the glued positioning card plate is connected to the multiple mold blocks, the other end of the glued positioning card plate is connected to the frame, one end of the multiple mold blocks is connected to the upper flange edge, and the other end of the multiple mold blocks is connected to the lower flange edge.

2. The composite skin forming tool according to claim 1, characterized in that: Each of the plurality of mold body blocks is provided with the same draft angle.

3. The composite skin forming tool according to claim 1, characterized in that: The upper flange bracket is perpendicular to the surface of the frame, and the upper flange bracket is fixed to the frame through a column.

4. The composite skin forming tool according to claim 1, characterized in that: The lower flange edge is flatly fixed on the lower flange bracket. The lower flange bracket is in a rectangular parallelepiped structure with the interior of the rectangular parallelepiped hollowed out. The lower flange bracket is vertically fixed on the frame.

5. The composite skin forming tool according to claim 1, characterized in that: A forklift hole and a lifting ring are arranged inside the frame, and a measurement reference hole is arranged on the top flat plate of the frame.

6. The composite skin forming tool according to claim 1, characterized in that: The composite skin forming tooling also includes a plurality of drilling templates, each of which is provided with drilling template holes, and a drill sleeve is installed in the drilling template hole and fixedly connected to the upper flange bracket or the lower flange bracket.

7. The composite skin forming tool according to claim 1, characterized in that: The composite skin forming tooling also includes an upper paving card plate, which is arranged on the edge of the upper flange and is a movable positioning block.

8. The composite skin forming tool according to claim 1, characterized in that: The composite skin forming tooling also includes a lower paving card plate, which is arranged on the lower flange edge and is a movable positioning block.

9. The composite skin forming tool according to claim 1, characterized in that: The composite skin forming tool also includes a first support block, the outer surface of which is in contact with the inner cavity of the mold block.

10. The composite skin forming tool according to claim 1, characterized in that: The composite skin forming tool also includes a second support block, the outer surface of which is in contact with the bottom of the mold block.

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