Forming assembly
By combining sewing fixtures, transfer fixtures, and fixing fixtures, the complex process and precision control challenges in molding large-size variable curvature heat-resistant layers were solved, achieving stable connection and precise molding of the molded parts.
Patent Information
- Application Number
- CN202511081413.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-04
- Publication Date
- 2025-11-07
AI Technical Summary
Large-sized variable curvature heat insulation layers present challenges in integrated molding processes, including complex manufacturing processes and difficulties in controlling dimensional accuracy.
The first and second preforms are fixed to the surface of the sewing fixture by sewing thread using a sewing fixture, and the position is further constrained by screw fixing holes. The stable connection and removal of the preforms are achieved by combining the transfer fixture and the fixing fixture, and the constraint fixture is used to prevent deformation.
It simplifies the molding process, improves dimensional accuracy control, and ensures the shape stability and precision of the molded parts.
Smart Images
Figure CN120902302A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of composite heat protection layer, and particularly relates to a forming assembly. BACKGROUND
[0002] The large-size variable-curvature heat protection layer has an equal-thickness structure and a local variable-thickness structure. Due to the large thickness difference (the maximum thickness is 70 mm and the minimum thickness is 0.1 mm) of the variable-thickness position and the characteristics of small R angle and special-shaped curved surface, the integrated forming has the problems of complex process and difficult size precision control. SUMMARY
[0003] Embodiments of the present application provide a forming assembly, aiming at solving the problems of complex process and difficult size precision control of the forming assembly in integrated forming.
[0004] Embodiments of the present application provide a forming assembly, which comprises a sewing tool. The sewing tool is in a cylindrical shape. In the circumferential direction of the sewing tool, the sewing tool comprises a first surface, a second surface, a third surface and a fourth surface. The first surface, the second surface, the third surface and the fourth surface are sequentially connected. The first surface and the third surface are oppositely arranged. The second surface and the fourth surface are oppositely arranged. The sewing tool has a first end and a second end in the extension direction thereof. At the first end, the edges of the first surface, the second surface, the third surface and the fourth surface form a circular opening. The curvature of the first edge of the second surface at the second end is greater than the curvature of the second edge of the second surface at the first end. The curvature of the third edge of the fourth surface at the second end is less than the curvature of the fourth edge of the fourth surface at the first end. The sewing tool is in a hollow structure. A plurality of sewing holes are arranged on the first surface, the second surface, the third surface and the fourth surface. The sewing holes are used for the sewing thread to pass through the sewing tool.
[0005] The forming assembly is used for connecting and forming the first pre-forming part and the second pre-forming part. The first pre-forming part is molded by phenolic pre-impregnated yarn or phenolic pre-impregnated cloth, and the second pre-forming part is molded by phenolic pre-impregnated material. The side surface of the first pre-forming part is matched with the first surface. The first surface and the third surface of the sewing tool are the same, that is, the side surface of the first pre-forming part is also matched with the first surface. In the process of connecting the first pre-forming part and the second pre-forming part by the sewing tool, the two first pre-forming parts are respectively covered on the first surface and the third surface, and then the two first pre-forming parts are fixed on the first surface and the third surface by sewing lines through the sewing holes on the first surface and the second surface. The second pre-forming part is wrapped around the first surface, the second surface, the third surface and the fourth surface of the entire sewing tool, and then the first pre-forming part and the second pre-forming part are fixed together by sewing lines through the sewing holes on the first surface and the second surface. The second pre-forming part is fixed on the third surface and the fourth surface by sewing lines through the sewing holes on the third surface and the fourth surface. The inner surface of the finally formed forming part is matched with the outer surface of the sewing tool. By connecting the first pre-forming part and the second pre-forming part to form the forming part, the problems of complex process and difficult size precision control in the process of integrated forming of the forming part can be solved.
[0006] In the above embodiment, during the process of fixing the first pre-forming part on the first surface or the third surface through the sewing hole, glass fiber yarn can be used as the sewing line. During the sewing process, the glass fiber yarn passing through the first pre-forming part is turned over to pass through the first pre-forming part through the same sewing hole, and a part of the glass fiber yarn is left in the sewing hole. The first pre-forming part is fixed on the first surface or the third surface by the strength of the glass fiber yarn itself, and the final forming part is convenient to take off from the first surface or the third surface.
[0007] In the above embodiment, the first edge has a first section, a second section and a third section connected in sequence, the bending directions of the first section and the third section are the same, and the bending directions of the first section and the second section are opposite. So that the first edge is in the shape of "Ω".
[0008] In the above embodiment, the sewing hole on the first surface is a plurality of first sewing holes, and the first surface is further provided with a first fixing hole and a second fixing hole. In the extension direction of the sewing tool, the first sewing hole is located between the first fixing hole and the second fixing hole. The first fixing hole and the second fixing hole are used for the screw to pass through the sewing tool.
[0009] By the above arrangement, the first fixing hole and the second fixing hole are provided with a plurality of first sewing holes therebetween, the first fixing hole and the second fixing hole are used for the screw to pass through the sewing tool, so that the first pre-forming part can be fixed on the first surface by the screw, and the position of the first pre-forming part on the first surface is further constrained. At the same time, since the first fixing hole and the second fixing hole are located at both ends, the final shape of the forming part is not affected.
[0010] In the above embodiment, similarly, the plurality of sewing holes on the third surface are a plurality of third sewing holes, and the third surface is further provided with a third fixing hole and a fourth fixing hole, and the third sewing holes are located between the third fixing hole and the fourth fixing hole in the extension direction of the sewing tool; wherein the plurality of third sewing holes are oppositely arranged with the plurality of first sewing holes; the third fixing hole and the fourth fixing hole are used for the screw to pass through the sewing tool.
[0011] By the above arrangement, the third fixing hole and the fourth fixing hole are provided with a plurality of third sewing holes therebetween, the third fixing hole and the fourth fixing hole are used for the screw to pass through the sewing tool, so that the first pre-forming part can be fixed on the third surface by the screw, and the position of the first pre-forming part on the third surface is further constrained. At the same time, since the third fixing hole and the fourth fixing hole are located at both ends, the final shape of the forming part is not affected.
[0012] In some embodiments, the plurality of sewing holes on the second surface are a plurality of second sewing holes, and in the extension direction of the sewing tool, part of the second sewing holes are located between the first sewing hole and the first fixing hole, and part of the second sewing holes are located between the first sewing hole and the second fixing hole.
[0013] By the above arrangement, in the extension direction of the sewing tool, the arrangement length of the second sewing holes is greater than the arrangement length of the first sewing holes, and part of the second sewing holes are located between the first sewing hole and the first fixing hole, and part of the second sewing holes are located between the first sewing hole and the second fixing hole, which can better fix the second pre-forming part on the second surface.
[0014] In some embodiments, the plurality of sewing holes on the fourth surface are a plurality of fourth sewing holes, and in the extension direction of the sewing tool, part of the fourth sewing holes are located between the first sewing hole and the first fixing hole, and part of the fourth sewing holes are located between the first sewing hole and the second fixing hole; the plurality of second sewing holes and the plurality of fourth sewing holes are oppositely arranged.
[0015] By the above arrangement, in the extension direction of the sewing tool, the arrangement length of the second sewing holes is greater than the arrangement length of the first sewing holes, and part of the second sewing holes are located between the first sewing hole and the first fixing hole, and part of the second sewing holes are located between the first sewing hole and the second fixing hole, which can better fix the second pre-forming part on the second surface.
[0016] In some embodiments, the forming assembly further comprises a transfer tool, the transfer tool comprising a first inner surface, a second inner surface, a third inner surface and a fourth inner surface, the first inner surface, the second inner surface, the third inner surface and the fourth inner surface being sequentially connected around the extension direction of the transfer tool; the first inner surface and the third inner surface are oppositely arranged, and the second inner surface and the fourth inner surface are oppositely arranged.
[0017] The first gap between the first inner surface and the first surface is equal everywhere; the second gap between the second inner surface and the second surface is equal everywhere; the third gap between the third inner surface and the third surface is equal everywhere; the fourth gap between the fourth inner surface and the fourth surface is equal everywhere; the first gap is equal to the third gap, the second gap is equal to the fourth gap, and the first gap is greater than the second gap; wherein the first inner surface, the second inner surface, the third inner surface and the fourth inner surface are each provided with a plurality of transfer holes for providing sewing space for sewing threads.
[0018] Through the above arrangement, after the first pre-forming piece and the second pre-forming piece are sewn and connected, the transfer tool is buckled on the sewing tool, and the first pre-forming piece and the second pre-forming piece are fixed on the transfer tool through the transfer holes on the first inner surface and the second inner surface and the transfer holes on the third inner surface and the fourth inner surface through the sewing threads; it is convenient to take the first pre-forming piece and the second pre-forming piece which are sewn and connected from the sewing tool.
[0019] In some embodiments, the forming assembly further comprises a fixing tool, the fixing tool comprising a first fixing surface, a second fixing surface, a third fixing surface and a fourth fixing surface, the first fixing surface, the second fixing surface, the third fixing surface and the fourth fixing surface being sequentially connected around the extension direction of the fixing tool to form the fixing surface of the fixing tool, the first fixing surface and the third fixing surface are oppositely arranged, and the second fixing surface and the fourth fixing surface are oppositely arranged; the first fixing surface is the same shape as the first surface, the second fixing surface is the same shape as the second surface, the third fixing surface is the same shape as the third surface, and the fourth fixing surface is the same shape as the fourth surface.
[0020] The above transfer tool takes the first pre-forming piece and the second pre-forming piece which are sewn and connected from the sewing tool, and the transfer tool can be buckled on the fixing tool.
[0021] In the above embodiments, the first fixing surface, the second fixing surface, the third fixing surface and the fourth fixing surface can be heated to realize the solidification forming of the first pre-forming piece and the second pre-forming piece, and finally form the forming piece.
[0022] In the above embodiments, the molding assembly further includes two first constraint fixtures and two second constraint fixtures; the two first constraint fixtures are respectively connected to both ends of the first fixed surface in its extension direction, and the first constraint fixtures are located on the side of the first fixed surface away from the third fixed surface; the two second constraint fixtures are respectively connected to both ends of the third fixed surface in its extension direction, and the second constraint fixtures are located on the side of the third fixed surface away from the first fixed surface.
[0023] With the above settings, the two first constraint fixtures and the two second constraint fixtures can constrain the position of the molded part and prevent deformation of the molded part during the curing process. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the sewing fixture structure in the embodiments of this application;
[0025] Figure 2 This is a schematic diagram of the structure of the fixing tooling in the embodiments of this application;
[0026] Figure 3 This is a schematic diagram of the structure of the first or second constraint tooling in the embodiments of this application.
[0027] Reference numerals: 10, sewing fixture; 100, sewing hole; 101, first end; 102, second end; 11, first surface; 111, first sewing hole; 112, first fixing hole; 113, second fixing hole; 12, second surface; 121, second sewing hole; 13, third surface; 131, third sewing hole; 132, third fixing hole; 133, fourth fixing hole; 14, fourth surface; 141, fourth sewing hole; 20, fixing fixture; 21, first fixing surface; 22, second fixing surface; 23, third fixing surface; 24, fourth fixing surface; 30, first constraint fixture; 40, second constraint fixture. Detailed Implementation
[0028] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.
[0029] In this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element. The terms "two or more" and "two or more than two" include both two and more than two entities.
[0030] The embodiment of the present application provides a forming assembly, which comprises a sewing tool 10, the sewing tool 10 is in a cylindrical shape, and the sewing tool 10 comprises a first surface 11, a second surface 12, a third surface 13 and a fourth surface 14 in the circumferential direction of the sewing tool 10, the first surface 11, the second surface 12, the third surface 13 and the fourth surface 14 are sequentially connected, the first surface 11 and the third surface 13 are oppositely arranged, and the second surface 12 and the fourth surface 14 are oppositely arranged.
[0031] The sewing tool 10 has a first end 101 and a second end 102 in the extending direction of the sewing tool 10; at the first end 101, the edges of the first surface 11, the second surface 12, the third surface 13 and the fourth surface 14 are combined into a circular opening; the curvature of the first edge of the second surface 12 at the second end 102 is greater than the curvature of the second edge of the second surface 12 at the first end 101, and the curvature of the third edge of the fourth surface 14 at the second end 102 is less than the curvature of the fourth edge of the fourth surface 14 at the first end 101.
[0032] The sewing tool 10 is a hollow structure, and a plurality of sewing holes 100 are arranged on the first surface 11, the second surface 12, the third surface 13 and the fourth surface 14, and the sewing holes 100 are used for the sewing thread to pass through the sewing tool 10.
[0033] The forming assembly is used for connecting and forming the first pre-forming member and the second pre-forming member. The first pre-forming member is molded by phenolic pre-impregnated yarn or phenolic pre-impregnated cloth, and the second pre-forming member is formed by layering phenolic pre-impregnated material. One side surface of the first pre-forming member is matched with the first surface 11. The first surface 11 and the third surface 13 of the sewing tool 10 are the same, that is, the one side surface of the first pre-forming member is also matched with the first surface 11. In the process of connecting the first pre-forming member and the second pre-forming member by the sewing tool 10, the two first pre-forming members are respectively covered on the first surface 11 and the third surface 13, and then the two first pre-forming members are fixed on the first surface 11 and the third surface 13 by sewing threads through the sewing holes 100 on the first surface 11 and the second surface 12. The second pre-forming member is wrapped around the first surface 11, the second surface 12, the third surface 13 and the fourth surface 14 of the sewing tool 10, and then the first pre-forming member and the second pre-forming member are fixed together by sewing threads through the sewing holes 100 on the first surface 11 and the second surface 12, and the second pre-forming member is fixed on the third surface 13 and the fourth surface 14 by sewing threads through the sewing holes 100 on the third surface 13 and the fourth surface 14. The inner surface of the finally formed forming member is matched with the outer surface of the sewing tool. By connecting the first pre-forming member and the second pre-forming member to form the forming member, the problems of complex process and difficult size precision control in the process of integrated forming of the forming member can be solved.
[0034] In the above embodiment, during the process of fixing the first pre-forming member on the first surface 11 or the third surface 13 by the sewing hole 100, the glass yarn fiber can be used as the sewing thread. In the process of sewing, after the glass yarn fiber passing through the first pre-forming member passes through a sewing hole 100, it is turned over to pass through the first pre-forming member through the same sewing hole 100, and a part of the glass yarn fiber is left in the sewing hole 100. The first pre-forming member is fixed on the first surface 11 or the third surface 13 by the self-strength of the glass yarn fiber, and the finally formed forming member is convenient to take off from the first surface 11 or the third surface 13.
[0035] In the above embodiment, the first edge has a first section, a second section and a third section connected in sequence, the bending directions of the first section and the third section are the same, and the bending directions of the first section and the second section are opposite. So that the first edge is in the shape of “Ω”.
[0036] In the above embodiment, the sewing holes 100 on the first surface 11 are a plurality of first sewing holes 111, and the first surface 11 is further provided with a first fixing hole 112 and a second fixing hole 113. In the extension direction of the sewing tool 10, the first sewing hole 111 is located between the first fixing hole 112 and the second fixing hole 113. The first fixing hole 112 and the second fixing hole 113 are used for the screw to pass through the sewing tool 10.
[0037] Through the above arrangement, the first fixing hole 112 and the second fixing hole 113 are provided with a plurality of first sewing holes 111 in between, and the first fixing hole 112 and the second fixing hole 113 are used for the screw to pass through the sewing tool 10, so that the first pre-forming part can be fixed on the first surface 11 by the screw, and the position of the first pre-forming part on the first surface 11 is further constrained. At the same time, since the first fixing hole 112 and the second fixing hole 113 are located at both ends, the final shape of the forming part will not be affected.
[0038] In the above embodiment, similarly, the plurality of sewing holes 100 on the third surface 13 are a plurality of third sewing holes 131, and the third surface 13 is further provided with a third fixing hole 132 and a fourth fixing hole 133, and the third sewing hole 131 is located between the third fixing hole 132 and the fourth fixing hole 133 in the extension direction of the sewing tool 10; wherein the plurality of third sewing holes 131 are oppositely arranged with the plurality of first sewing holes 111; the third fixing hole 132 and the fourth fixing hole 133 are used for the screw to pass through the sewing tool 10.
[0039] Through the above arrangement, the third fixing hole 132 and the fourth fixing hole 133 are provided with a plurality of third sewing holes 131 in between, and the third fixing hole 132 and the fourth fixing hole 133 are used for the screw to pass through the sewing tool 10, so that the first pre-forming part can be fixed on the third surface 13 by the screw, and the position of the first pre-forming part on the third surface 13 is further constrained. At the same time, since the third fixing hole 132 and the fourth fixing hole 133 are located at both ends, the final shape of the forming part will not be affected.
[0040] In some embodiments, the plurality of sewing holes 100 on the second surface 12 are a plurality of second sewing holes 121, and in the extension direction of the sewing tool 10, part of the second sewing holes 121 are located between the first sewing hole 111 and the first fixing hole 112, and part of the second sewing holes 121 are located between the first sewing hole 111 and the second fixing hole 113.
[0041] Through the above arrangement, in the extension direction of the sewing tool 10, the arrangement length of the second sewing hole 121 is greater than the arrangement length of the first sewing hole 111, and part of the second sewing hole 121 is located between the first sewing hole 111 and the first fixing hole 112, and part of the second sewing hole 121 is located between the first sewing hole 111 and the second fixing hole 113, which can better fix the second pre-forming part on the second surface 12.
[0042] In some embodiments, the plurality of stitching holes 100 on the fourth surface 14 are a plurality of fourth stitching holes 141, and in the extension direction of the stitching tool 10, some of the fourth stitching holes 141 are located between the first stitching hole 111 and the first fixing hole 112, and some of the fourth stitching holes 141 are located between the first stitching hole 111 and the second fixing hole 113; the plurality of second stitching holes 121 and the plurality of fourth stitching holes 141 are oppositely arranged.
[0043] Through the above arrangement, in the extension direction of the stitching tool 10, the arrangement length of the second stitching hole 121 is greater than the arrangement length of the first stitching hole 111, and some of the second stitching holes 121 are located between the first stitching hole 111 and the first fixing hole 112, and some of the second stitching holes 121 are located between the first stitching hole 111 and the second fixing hole 113, which can better fix the second preform on the second surface 12.
[0044] In some embodiments, the forming assembly further comprises a transfer tool, the transfer tool comprising a first inner surface, a second inner surface, a third inner surface, and a fourth inner surface, the first inner surface, the second inner surface, the third inner surface, and the fourth inner surface being sequentially connected in the extension direction of the transfer tool; the first inner surface and the third inner surface are oppositely arranged, and the second inner surface and the fourth inner surface are oppositely arranged; the first gap between the first inner surface and the first surface 11 is equal everywhere; the second gap between the second inner surface and the second surface 12 is equal everywhere; the third gap between the third inner surface and the third surface 13 is equal everywhere; the fourth gap between the fourth inner surface and the fourth surface 14 is equal everywhere; the first gap is equal to the third gap, the second gap is equal to the fourth gap, and the first gap is greater than the second gap; wherein the first inner surface, the second inner surface, the third inner surface, and the fourth inner surface are each provided with a plurality of transfer holes for providing a stitching space for the stitching thread.
[0045] Through the above arrangement, after the first preform and the second preform are stitched and connected, the transfer tool is buckled on the stitching tool 10, and the first preform and the second preform are fixed on the transfer tool by the transfer holes on the first inner surface and the second inner surface and the transfer holes on the third inner surface and the fourth inner surface through the stitching thread; it is convenient to take the first preform and the second preform which are stitched and connected from the stitching tool 10.
[0046] In some embodiments, the forming assembly further comprises a fixing tool 20, the fixing tool 20 comprises a first fixing surface 21, a second fixing surface 22, a third fixing surface 23 and a fourth fixing surface 24, the first fixing surface 21, the second fixing surface 22, the third fixing surface 23 and the fourth fixing surface 24 are sequentially connected to form a fixing surface of the fixing tool 20 around the extension direction of the fixing tool 20, the first fixing surface 21 and the third fixing surface 23 are oppositely arranged, and the second fixing surface 22 and the fourth fixing surface 24 are oppositely arranged; the first fixing surface 21 is identical in shape to the first surface 11, the second fixing surface 22 is identical in shape to the second surface 12, the third fixing surface 23 is identical in shape to the third surface 13, and the fourth fixing surface 24 is identical in shape to the fourth surface 14.
[0047] The transfer tool can be buckled on the fixing tool 20 to take the sutured first pre-forming part and the second pre-forming part from the suture tool 10.
[0048] In the above embodiments, the first fixing surface 21, the second fixing surface 22, the third fixing surface 23 and the fourth fixing surface 24 can be heated to realize the curing forming of the first pre-forming part and the second pre-forming part, and finally form the forming part.
[0049] In the above embodiments, the forming assembly further comprises two first constraint tools 30 and two second constraint tools 40, the two first constraint tools 30 are respectively connected to two ends of the first fixing surface 21 in the extension direction thereof, and the first constraint tool 30 is located on the side of the first fixing surface 21 away from the third fixing surface 23; the two second constraint tools 40 are respectively connected to two ends of the third fixing surface 23 in the extension direction thereof, and the second constraint tool 40 is located on the side of the third fixing surface 23 away from the first fixing surface 21.
[0050] Through the above arrangement, the two first constraint tools 30 and the two second constraint tools 40 can constrain the position of the forming part to avoid deformation of the forming part during the curing process.
[0051] In some embodiments, the forming assembly further comprises a moving tool, the moving tool is connected to the transfer tool, and the moving tool is used to move the transfer tool to cooperate with the suture tool or to cooperate with the fixing tool 20.
[0052] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.
[0053] The above examples are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.
[0054] Although the preferred embodiments of the present specification have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present specification.
[0055] Obviously, those skilled in the art can make various modifications and variations to the present specification without departing from the spirit and scope of the present specification. Thus, if these modifications and variations of the present specification fall within the scope of the claims of the present specification and their equivalents, the present specification also intends to include these modifications and variations.
Claims
1. A molding assembly characterized by, The utility model relates to a sewing tool which comprises: a cylindrical sewing tool having a first surface, a second surface, a third surface and a fourth surface in sequence, the first surface and the third surface being oppositely arranged, and the second surface and the fourth surface being oppositely arranged; the sewing tool has a first end and a second end in its extension direction; at the first end, the edges of the first surface, the second surface, the third surface and the fourth surface form a circular opening; the curvature of the second surface at a first edge of the second end is greater than that of the second surface at a second edge of the first end, and the curvature of the fourth surface at a third edge of the second end is less than that of the fourth surface at a fourth edge of the first end; wherein the sewing tool is a hollow structure, and a plurality of sewing holes are arranged on the first surface, the second surface, the third surface and the fourth surface for sewing thread to pass through the sewing tool.
2. The molding assembly of claim 1, wherein, The first edge has a first segment, a second segment and a third segment in sequence, the bending directions of the first segment and the third segment are the same, and the bending directions of the first segment and the second segment are opposite.
3. The molding assembly of claim 1, wherein, The sewing holes on the first surface are a plurality of first sewing holes, and the first surface is further provided with a first fixing hole and a second fixing hole, the first sewing holes being located between the first fixing hole and the second fixing hole in the extension direction of the sewing tool; wherein the first fixing hole and the second fixing hole are used for screws to pass through the sewing tool.
4. The molding assembly of claim 3, wherein, The plurality of sewing holes on the third surface are a plurality of third sewing holes, and the third surface is further provided with a third fixing hole and a fourth fixing hole, the third sewing holes being located between the third fixing hole and the fourth fixing hole in the extension direction of the sewing tool; wherein the plurality of third sewing holes are oppositely arranged with the plurality of first sewing holes; the third fixing hole and the fourth fixing hole are used for screws to pass through the sewing tool.
5. The molding assembly of claim 3, wherein, The plurality of sewing holes on the second surface are a plurality of second sewing holes, and part of the second sewing holes are located between the first sewing holes and the first fixing hole, and part of the second sewing holes are located between the first sewing holes and the second fixing hole in the extension direction of the sewing tool.
6. The molding assembly of claim 5, wherein, The plurality of sewing holes on the fourth surface are a plurality of fourth sewing holes, and part of the fourth sewing holes are located between the first sewing holes and the first fixing hole, and part of the fourth sewing holes are located between the first sewing holes and the second fixing hole in the extension direction of the sewing tool; the plurality of second sewing holes and the plurality of fourth sewing holes are oppositely arranged.
7. The molding assembly of any of claims 1-6, wherein, The forming assembly further comprises a transfer tool, the transfer tool comprising a first inner surface, a second inner surface, a third inner surface and a fourth inner surface, the first inner surface, the second inner surface, the third inner surface and the fourth inner surface being sequentially connected in the extension direction of the transfer tool, the first inner surface and the third inner surface being oppositely arranged, and the second inner surface and the fourth inner surface being oppositely arranged; The first gap between the first inner surface and the first surface is equal everywhere; The second gap between the second inner surface and the second surface is equal everywhere; The third gap between the third inner surface and the third surface is equal everywhere; the fourth gap between the fourth inner surface and the fourth surface is equal everywhere; the first gap is equal to the third gap, the second gap is equal to the fourth gap, and the first gap is greater than the second gap; The first inner surface, the second inner surface, the third inner surface and the fourth inner surface are provided with a plurality of transfer holes for providing sewing space for sewing threads.
8. The molding assembly of claim 7, wherein, The forming assembly further comprises a fixing tool, the fixing tool comprising a first fixed surface, a second fixed surface, a third fixed surface and a fourth fixed surface, the first fixed surface, the second fixed surface, the third fixed surface and the fourth fixed surface being sequentially connected in the extension direction of the fixing tool, the first fixed surface and the third fixed surface being oppositely arranged, and the second fixed surface and the fourth fixed surface being oppositely arranged; The first fixed surface is the same in shape as the first surface, the second fixed surface is the same in shape as the second surface, the third fixed surface is the same in shape as the third surface, and the fourth fixed surface is the same in shape as the fourth surface.
9. The molding assembly of claim 8, wherein, The first fixed surface, the second fixed surface, the third fixed surface and the fourth fixed surface can be heated.
10. The molding assembly of claim 8, wherein, The forming assembly further comprises two first constraint tools and two second constraint tools; The two first constraint tools are respectively connected to the two ends of the first fixed surface in the extension direction thereof, and the first constraint tool is located on the side of the first fixed surface away from the third fixed surface; The two second constraint tools are respectively connected to the two ends of the third fixed surface in the extension direction thereof, and the second constraint tool is located on the side of the third fixed surface away from the first fixed surface.