Corrugated pipe forming device

Abstract

The invention belongs to the technical field of aerospace, and particularly relates to a corrugated pipe forming device which comprises a template. The positioning part is connected with the template, the lower positioning part comprises a first connecting part matched with the template, a first male die matched with the inner wall of a pipe to be formed and a second male die with the radial size smaller than that of the first male die, and the upper positioning part comprises a second connecting part matched with the template and a female die matched with the inner wall of the pipe to be formed. Part of the second male die penetrates into the female die and then is attached to the inner wall of the female die to form an annular space for containing the extrusion ring; the first mold is provided with a first corrugated groove; the extrusion ring comprises a first extrusion ring body arranged in the annular space, the shape of the first extrusion ring body is matched with that of the first corrugated groove, and when external force is applied to the first extrusion ring body, the to-be-formed pipe is stressed to deform outwards and forms first corrugations under cooperation of the first corrugated groove; the mold jacket is arranged on the outer side of the first mold; and the bracket is arranged on the template. And the corrugated forming precision is improved while the corrugated pipe of the specific specification is customized conveniently.

Description

Technical Field

[0001] The present invention relates to the field of aerospace, and in particular to a bellows forming device. Background Art

[0002] Bellows are mainly used to compensate for pipeline thermal deformation, reduce vibration, absorb pipeline settlement deformation, etc. In order to meet the performance requirements of the equipment, bellows of specific specifications are required to meet the operation requirements of specific parts, and the consistency requirements for bellows of specific specifications are high. Traditionally, the manufacture of bellows requires a complete set of equipment, which is usually suitable for batch manufacturing of bellows of corresponding specifications and cannot meet the manufacturing requirements of bellows of specific specifications. This complete set of equipment is costly and has a long debugging cycle. Summary of the invention

[0003] The present invention is proposed based on the above-mentioned requirements of the prior art. The technical problem to be solved by the present invention is to improve the accuracy of corrugation forming while customizing corrugated pipes of specific specifications.

[0004] In order to solve the above problems, the present invention is implemented by adopting the following technical solutions: a corrugated tube forming device, characterized in that it comprises: a corrugated tube forming device, characterized in that it comprises: a template, comprising a lower template and an upper template arranged opposite to each other in a vertical direction; a positioning part, the positioning part is fixedly connected to the template, the positioning part comprises: a lower positioning part that penetrates into the interior of the tube to be formed from below and abuts against the inner wall of the tube to be formed, and an upper positioning part that penetrates into the interior of the tube to be formed from above and abuts against the inner wall of the tube to be formed, wherein the lower positioning part comprises a first connecting part that cooperates with the lower template, a first punch that extends upward from the first connecting part to the interior of the tube to be formed and abuts against the inner wall of the tube to be formed, and a second punch that extends upward from the first punch, the radial size of the second punch being smaller than the radial size of the first punch, and the upper positioning part comprises a first connecting part that cooperates with the upper template A second connecting portion of the template that cooperates on the horizontal plane, and a die that is inserted into the interior of the tube to be formed from above and abuts against the inner wall of the tube to be formed, the die having a hollow space, the top portion of the second punch penetrates into the interior of the hollow space and fits tightly with the inner wall of the hollow space to form an annular space that can accommodate an extrusion ring; a first mold, the inner wall of the first mold having a first corrugated groove to provide a space for the tube to be formed to deform outward under the action of an external force; the extrusion ring includes a first extrusion ring, the first extrusion ring is arranged in the annular space, its position corresponds to the first corrugated groove, and its shape is adapted to the first corrugated groove, when an external force is applied to the first extrusion ring, the tube to be formed is deformed outward under the force, and a first corrugation is formed with the cooperation of the first corrugated groove; a mold jacket is arranged on the outside of the first mold to provide an inward clamping force; a bracket is arranged on the lower template.

[0005] Furthermore, the upper template and the lower template have through holes penetrating in the vertical direction, and the template and the positioning portion are fixedly connected via the through holes to fix the tube to be formed on the template along a horizontal plane.

[0006] Further, the first mold includes a first lower half mold surrounding the lower half of the tube to be formed from the outside, and a first upper half mold surrounding the upper half of the tube to be formed from the outside, the upper end surface of the first lower half mold is tightly fitted with the lower end surface of the first upper half mold, wherein the inner side wall at the fitting position of the first lower half mold forms a first lower curved surface, the inner side wall at the fitting position of the first upper half mold forms a first upper curved surface, and the first corrugated groove is jointly formed on the inner side of the fitting position of the first lower half mold and the first upper half mold.

[0007] Further, the corrugated tube forming device includes: a second mold, the inner wall of the second mold has a second corrugated groove to provide a space for deformation based on the first corrugation under the action of external force, the second mold includes a second lower half mold surrounding the lower half of the tube to be formed from the outside, and a second upper half mold surrounding the upper half of the tube to be formed from the outside, the upper end face of the second lower half mold is tightly fitted with the lower end face of the second upper half mold, wherein the inner side wall at the fitting position of the second lower half mold forms a second lower curved surface, the inner side wall at the fitting position of the second upper half mold forms a second upper curved surface, and the second corrugated groove is jointly formed on the inner side of the fitting position of the second lower half mold and the second upper half mold; the extrusion ring also includes a second extrusion ring, the second extrusion ring is arranged in the annular space, its position corresponds to the second corrugated groove, and its shape is adapted to the second corrugated groove, when external force is applied to the second extrusion ring, the first corrugation is deformed outward by force, and a second corrugation is formed with the cooperation of the second corrugated groove.

[0008] Furthermore, the corrugated tube forming device includes: a first clamping block, located between the first upper half mold and the second lower half mold, the first clamping block having a recessed clamping groove in the middle inner side, the shape of the clamping groove being adapted to the second corrugation; the curved surface below the clamping groove and the first lower curved surface in the first lower half mold forming a first corrugated groove; the curved surface above the clamping groove and the first upper curved surface in the first upper half mold forming a first corrugated groove.

[0009] Furthermore, the corrugated tube forming device includes: a second clamping block, a second clamping block having a recessed clamping groove in the middle of the inner side, the shape of the clamping groove being adapted to the second corrugation; a curved surface below the clamping groove and a second lower curved surface in the second lower half mold forming a second corrugated groove; and a curved surface above the clamping groove and a second upper curved surface in the second upper half mold forming a second corrugated groove.

[0010] Furthermore, the wall thickness of the lower half mold near the corrugated groove is greater than the wall thickness of other parts, and the wall thickness of the upper half mold near the corrugated groove is greater than the wall thickness of other parts.

[0011] Furthermore, the inner diameter of the first lower curved surface gradually increases from bottom to top, and the inner diameter of the first upper curved surface gradually decreases from bottom to top, and the first lower curved surface and the first upper curved surface are symmetrically arranged with each other along the horizontal direction.

[0012] Furthermore, the mold is arranged between the upper mold and the lower mold, and the mold includes a first mold and a second mold. A supporting ring is arranged between the upper mold and the mold, and a supporting ring is also arranged between the lower mold and the mold.

[0013] Furthermore, the mold jacket comprises a lower mold jacket and an upper mold jacket, the lower mold jacket embraces the lower mold from the outside, and the upper mold jacket embraces the upper mold from the outside, the wall thickness of the lower mold jacket gradually increases from top to bottom, and the wall thickness of the upper mold jacket gradually increases from bottom to top, so that the outer wall of the mold jacket is perpendicular to the template, so that the mold jacket can stably surround the tube to be formed under the action of external force.

[0014] Compared with the prior art, the present invention improves the accuracy of corrugation forming while customizing the corrugated pipe with specific specifications.

[0015] Compared with the prior art, the present invention can customize the corrugated pipe with specific specifications while achieving stronger consistency in the corrugated shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 is a structural diagram of a cross section of a bellows forming device in a specific embodiment of the present invention;

[0018] Figure 2 This is a structural diagram of the first corrugation forming in a specific embodiment of the present invention;

[0019] Figure 3 It is a structural diagram of the second corrugation forming in a specific embodiment of the present invention;

[0020] Figure 4 is a structural diagram of the first card block in a specific implementation manner of the present invention;

[0021] Figure 5 It is a structural diagram of the second card block in a specific implementation manner of the present invention.

[0022] Reference numerals:

[0023] 1. Template; 1-1. Lower template; 1-2. Upper template; 2. Lower positioning part; 2-1. First connecting part; 2-2. First punch; 2-3. Second punch; 3. Upper positioning part; 3-1. Second connecting part; 3-2. Concave mold; 4. First mold; 4-1. First lower mold half; 4-2. First upper mold half; 5. Bracket; 6. First lower curved surface; 7. First corrugated groove; 8. First upper curved surface; 9. First corrugation; 10. Second mold; 10-1. Second lower mold half; 10-2. Second upper mold half; 11. Second corrugated groove; 12. Second lower curved surface; 13. Second upper curved surface; 14. Second corrugation; 15. First clamping block; 16. Second clamping block; 17. Lower mold half jacket; 18. Upper mold half jacket; 19. First extrusion ring; 20. Second extrusion ring; 21. Support ring. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 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 are within the scope of protection of the present invention.

[0025] To facilitate understanding of the embodiments of the present invention, further explanation will be given below with reference to specific embodiments in conjunction with the accompanying drawings. The embodiments do not constitute a limitation on the protection scope of the present invention.

[0026] Bellows are widely used in aerospace and other fields. The bellows used in these fields are complex and diverse. In some cases, in order to meet the performance requirements of the equipment, bellows of specific specifications are required to meet the aviation operation needs of specific parts. This usually requires the production of bellows of various specifications, such as different pipe directional dimensions, different spacing between each corrugation, etc., which increases the difficulty of bellows molding. Traditionally, the manufacture of bellows requires a complete set of equipment, which is usually suitable for batch production of bellows of corresponding specifications and cannot meet the manufacturing needs of bellows of specific specifications. In order to meet the manufacturing needs of bellows of specific specifications, such as Figure 1 As shown, this specific embodiment provides a bellows forming device for customizing bellows of specific specifications, which effectively solves the problem of urgently needing bellows of specific specifications in emergencies. The bellows forming device includes a template 1, a lower positioning part 2, an upper positioning part 3 and a first mold 4.

[0027] The template 1 includes a lower template 1-1 and an upper template 1-2, and the lower template 1-1 and the upper template 1-2 are arranged opposite to each other in the vertical direction, and a space is formed between the two in the vertical direction for longitudinally placing the tube to be formed and other components of the forming device. The lower template 1-1 and the upper template 1-2 have through holes that penetrate in the vertical direction, and the lower positioning part 2 and the upper positioning part 3 of the forming device are respectively connected to the lower template and the upper template through the through holes, so that the lower positioning part and the upper positioning part are fixedly connected to the template in the horizontal plane direction. Preferably, a bracket 5 is provided on the lower template 1-1 to facilitate the setting of the forming device on a mechanical pressurized operating table or other equipment for forming operations, so as to prevent the forming device from shaking during the pressurization process and affecting the forming accuracy.

[0028] The lower positioning portion 2 includes a first connecting portion 2-1, a first punch 2-2 and a second punch 2-3. The first connecting portion 2-1 is arranged below the lower positioning portion 2. The shape of the first connecting portion is adapted to the through hole on the lower template 1-1. When the first connecting portion cooperates with the through hole in the vertical direction, the lower positioning portion 2 is restricted from moving relative to the lower template 1-1 on the horizontal plane.

[0029] The first convex mold 2-2 is formed by the first connecting portion 2-1 extending upward, and the height of the first convex mold 2-2 is less than the height of the tube to be formed. The outer side surface of the first convex mold 2-2 is adapted to the shape of the inner wall of the tube to be formed. When the first convex mold 2-2 is accommodated in the tube to be formed, the outer wall of the first convex mold 2-2 and the inner wall of the tube to be formed fit closely to each other, and the bottom surface of the first convex mold 2-2 fits closely to the upper surface of the lower template 1-1, and then the position of the tube to be formed on the horizontal plane is limited by the lower positioning portion 2, that is, the displacement of the tube to be formed on the horizontal plane relative to the lower template 1-1 is limited, so that the tube to be formed can be stably set on the lower template.

[0030] In this specific embodiment, the first punch 2-2 and the second punch 2-3 are both columnar, which are adapted to the inner wall shape of the tube to be formed. Further, the first punch 2-2 and the second punch 2-3 can have a variety of shapes, so as to cooperate with the tube when forming tubes of different shapes.

[0031] The second punch 2-3 extends upward from the first punch 2-2, the outer diameter of the second punch 2-3 is smaller than the outer diameter of the first punch 2-2, and the second punch 2-3 cooperates with the upper positioning portion 3 accommodated inside the tube to be formed.

[0032] The upper positioning portion 3 is arranged below the upper template 1-2, and the upper positioning portion 3 includes a second connecting portion 3-1 and a die 3-2. The second connecting portion 3-1 is arranged at the top of the upper positioning portion, and the shape of the second connecting portion is adapted to the through hole on the upper template 1-2, and the second connecting portion cooperates with the through hole in the vertical direction. At this time, the upper template 1-2 restricts the upper positioning portion 3 from moving relative to the upper template 1-1 on the horizontal plane. The die 3-2 is inserted into the inner side of the tube to be formed from above. When the second connecting portion 3-1 is adapted to the through hole in the upper template, the tube to be formed cannot move relative to the upper template on the horizontal plane under the action of the die.

[0033] The female mold 3-2 is formed by the second connecting part 3-1 extending downward, and the lower end of the female mold has an opening, and the opening extends upward to form a hollow space, and the upper end of the second male mold 2-3 penetrates into the interior of the hollow space and fits tightly with the inner wall of the hollow space to form an annular space capable of accommodating an extrusion ring. The upper and lower sides of the tube to be formed are respectively limited by the upper positioning part 2 and the lower positioning part 3 to limit the relative movement of the tube to be formed and the upper template 1-2 and the lower template 1-1 of the forming device on the horizontal plane. The second male mold 2-3 of the lower positioning part 2 and the part of the female mold in the upper positioning part 3 are mutually abutted and matched, and the limiting force of the tube to be formed is strengthened in the middle of the tube to be formed, preventing the tube to be formed and other components in the forming device from moving relative to each other, ensuring that the tube to be formed is stably arranged outside the upper positioning part and the lower positioning part, which is conducive to accurately forming the tube to be formed into the required corrugation.

[0034] Furthermore, the radial dimensions of the lower positioning portion 2 and the upper positioning portion 3 have various specifications. When it is necessary to form different sizes of tubes to be formed into corrugated tubes, the upper positioning portion and the lower positioning portion corresponding to the size of the tubes to be formed can be flexibly replaced without replacing other structures in the forming device, thereby improving the application flexibility of the forming device and reducing costs.

[0035] The first mold 4 includes a first lower mold 4-1 and a first upper mold 4-2. The first lower mold 4-1 surrounds the lower half of the tube to be formed from the outside of the tube to be formed, and the first upper mold 4-2 surrounds the upper half of the tube to be formed from the outside of the tube to be formed, and the inner diameters of the two are adapted to the outer diameter of the tube to be formed.

[0036] When the first lower mold 4-1 and the first upper mold 4-2 simultaneously surround the tube to be formed from the outside, the upper end surface of the lower mold and the lower end surface of the upper mold fit closely, and the inner walls of the two fit closely with the outer wall of the tube to be formed. The inner walls of the first lower mold 4-1 and the first upper mold 4-2 have a preset corrugated groove, that is, there is a molding space outside the position where the tube to be formed needs to be formed into corrugations. Specifically, the top end of the side wall of the first lower mold 4-1 extends downward to form a first lower curved surface 6, and the inner diameter of the first lower curved surface gradually increases from bottom to top; the bottom end of the side wall of the first upper mold 4-2 extends upward to form a first upper curved surface 8, and the inner diameter of the first upper curved surface gradually decreases from bottom to top. The first lower curved surface 6 and the first upper curved surface 8 are arranged symmetrically in the horizontal direction, and the first lower curved surface 6 and the first upper curved surface 8 are jointly formed into a first corrugated groove 7 on the inner side of the fitting part of the first lower mold 4-1 and the first upper mold 4-2. Furthermore, in order to avoid the risk of damage to the first lower mold 4-1 or the first upper mold 4-2 due to stress concentration near the first lower surface 6 and the first upper surface 8 during mechanical pressurization, the wall thickness of the first lower mold 4-1 and the first upper mold 4-2 near the first lower surface 6 and the first upper surface 8 is thicker than other parts.

[0037] Furthermore, the first lower curved surface 6 in the first lower half mold 4-1 and the first upper curved surface 8 in the first upper half mold 4-2 preferably have a variety of specifications. When it is necessary to process a corrugated tube with other corrugation sizes, the lower half mold and the upper half mold with the first lower curved surface 6 and the first upper curved surface 8 of corresponding sizes can be flexibly replaced, thereby improving the adaptability of the molding device.

[0038] During the external force forming process, the lower positioning part 2 and the upper positioning part 3 are first fixedly connected to the lower template 1-1 and the upper template 1-2 respectively. Then the tube to be formed is sleeved on the outer side of the first convex mold 2-2 in the lower positioning part 2, and then the first lower half mold 4-1 and the first upper half mold 4-2 are sequentially held from the outside of the tube to be formed, and at this time, the first corrugated groove 7 is formed together at the joint part of the lower half mold and the upper half mold. Then, the upper positioning part 3 is inserted into the tube to be formed from above the tube to be formed, so that the outer side wall of the concave mold 3-2 in the upper positioning part 3 is tightly fitted with the inner side wall of the tube to be formed, and part of the inner wall of the bottom end of the concave mold and part of the outer wall of the top end of the second convex mold 2-3 in the convex mold 2-2 are pressed against each other, so that the tube to be formed is fixedly set on the forming device along the horizontal plane.

[0039] Then, a first extrusion ring 19 is arranged at a position corresponding to the first lower curved surface 6 and the first upper curved surface 8 on the inner side of the tube to be formed, that is, the first extrusion ring is arranged in the annular space outside the second punch 2-3. Moreover, the shape of the first extrusion ring 19 is adapted to the shape of the first corrugated groove 7. When an external force is applied to the first extrusion ring, the tube to be formed is deformed by the internal extrusion force to form the first corrugation 9. At this time, the first corrugation forming, i.e., the preliminary forming, is completed. Figure 2 shown.

[0040] Furthermore, the first extrusion ring is preferably made of polyurethane material, so that the tube to be formed can be evenly stressed under the action of the internal extrusion force, which helps to achieve the consistency of the corrugated shape. Furthermore, a support ring 21 is preferably provided at the position where the lower half mold 4-1 and the upper half mold 4-2 contact the template 1, which can prevent the tube to be formed from directly contacting the template 1 during the forming process and causing wear.

[0041] In this specific embodiment, after the first corrugation forming is completed, the first mold 4 is replaced with a second mold 10 to perform a correction forming on the first corrugation 9. Figure 3 As shown, the second mold 10 includes a second lower mold 10-1 and a second upper mold 10-2, the second lower mold 10-1 surrounds the lower half of the tube to be formed from the outside of the tube to be formed, and the second upper mold 10-2 surrounds the upper half of the tube to be formed from the outside of the tube to be formed, and the upper end surface of the second lower mold is tightly fitted with the lower end surface of the second upper mold.

[0042] The top end of the side wall of the second lower mold 10-1 extends downward to form a second lower curved surface 12, and the inner diameter of the second lower curved surface gradually increases from bottom to top; the bottom end of the side wall of the second upper mold 10-2 extends upward to form a second upper curved surface 13, and the inner diameter of the second upper curved surface gradually decreases from bottom to top. The second lower curved surface 12 and the second upper curved surface 13 are symmetrically arranged in the horizontal direction, and the second lower curved surface 12 and the second upper curved surface 13 are jointly formed as a second corrugated groove 11 on the inner side of the second lower mold 10-1 and the second upper mold 10-2 fitting part.

[0043] A second extrusion ring 20 is arranged at a position corresponding to the second lower curved surface 12 and the second upper curved surface 13 on the inner side of the tube to be formed, that is, the second extrusion ring is arranged in the annular space outside the second punch 2-3. The shape of the second extrusion ring 20 is adapted to the shape of the second corrugated groove 11. When an external force is applied to the second extrusion ring, the first corrugation 9 is subjected to a second forming, i.e., a correction forming, to form the second corrugation 14, which is the forming corrugation. At this time, the correction forming of the first corrugation 9 is initially completed.

[0044] After the shaped corrugation, i.e., the second corrugation 14, is obtained, a first clamping block 15 is arranged outside the shaped corrugation, such as Figure 4 The first clamping block 15 has a recessed clamping groove in the middle of the inner side, and the shape of the clamping groove matches the second corrugation 14; the curved surface below the clamping groove and the first lower curved surface 6 in the first lower half mold 4-1 form a first corrugated groove 7; the curved surface above the clamping groove and the first upper curved surface 8 in the first upper half mold 4-2 form a first corrugated groove 7.

[0045] In this way, after processing the first formed corrugation, i.e., the second corrugation 14, when repeating the first forming step, the first clamping block 15 can be used to firmly clamp the tube to be formed that has been partially formed into the second corrugation 14, while repeating the second forming step for other parts of the tube to be formed.

[0046] When the first clamping block 15 is matched with the partially formed tube to be formed, the first mold 4 is respectively set at the upper and lower ends of the tube to be formed. Specifically, the upper end surface of the first lower mold 4-1 is fitted with the lower end surface of the first clamping block 15, and the lower end surface of the first upper mold 4-2 is fitted with the upper end surface of the first clamping block 15, so that a first corrugated groove 7 is formed above and below the first clamping block 15. At this time, under the action of external force, the first molding process of the tube to be formed is repeated by the joint action of the first clamping block 15 and the first mold 4.

[0047] Then repeat the second forming step, i.e., the correction forming step, and replace the first clamping block 15 with the second clamping block 16. The inner wall of the second clamping block has a clamping groove, and the shape of the clamping groove is adapted to the shape of the second corrugated groove 11. Figure 5 When the second clamping block 16 is matched with the tube to be formed, the second mold 10 is respectively set at the upper and lower ends of the tube to be formed, so that a second corrugated groove 11 is formed at the upper and lower ends of the second clamping block. At this time, the repeated second molding operation steps are the same as the first and second molding operations, and finally a plurality of molded corrugations, namely, second corrugations 14, are obtained.

[0048] In order to prevent the first lower mold 4-1 and the first upper mold 4-2 from being damaged or deformed under the force, thereby affecting the molding effect, the molding device further includes a lower mold jacket 17 and an upper mold jacket 18. The lower mold jacket 17 holds the first lower mold 4-1 from the outside, and the upper mold jacket 18 holds the first upper mold 4-2 from the outside. Under the action of external force, the lower mold jacket and the upper mold jacket hold the lower mold, the upper mold and the tube to be molded inwardly, thereby providing a clamping force inwardly.

[0049] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A corrugated tube forming device, characterized in that: include: The template comprises a lower template and an upper template which are arranged opposite to each other in the vertical direction; A positioning part, the positioning part is fixedly connected to the template, and the positioning part includes: a lower positioning part that penetrates into the interior of the tube to be formed from below and abuts against the inner wall of the tube to be formed, and an upper positioning part that penetrates into the interior of the tube to be formed from above and abuts against the inner wall of the tube to be formed; The lower positioning portion includes a first connecting portion matched with the lower template, a first convex mold extending upward from the first connecting portion to the inside of the tube to be formed and abutting against the inner wall thereof, and a second convex mold extending upward from the first convex mold, wherein the radial dimension of the second convex mold is smaller than the radial dimension of the first convex mold. The upper positioning portion includes a second connecting portion that cooperates with the upper template on a horizontal plane, and a concave die that is inserted into the interior of the tube to be formed from above and abuts against the inner wall of the tube to be formed, wherein the concave die has a hollow space, and the top end of the second convex die penetrates into the interior of the hollow space and fits tightly with the inner wall of the hollow space to form an annular space capable of accommodating an extrusion ring; A first mold, wherein the inner wall of the first mold has a first corrugated groove to provide a space for the tube to be formed to deform outward under the action of an external force; The extrusion ring includes a first extrusion ring, which is arranged in the annular space, and its position corresponds to the first corrugated groove, and its shape is adapted to the first corrugated groove. When an external force is applied to the first extrusion ring, the tube to be formed is deformed outward by the force, and forms a first corrugation under the cooperation of the first corrugated groove; A mold jacket, arranged outside the first mold to provide an inward clamping force; The bracket is arranged on the lower template.

2. The corrugated tube forming device according to claim 1, characterized in that: The upper template and the lower template have through holes penetrating in the vertical direction, and the template and the positioning portion are fixedly connected through the through holes to fix the tube to be formed on the template along a horizontal plane.

3. The corrugated tube forming device according to claim 1, characterized in that: The first mold comprises a first lower mold that surrounds the lower half of the tube to be formed from the outside, and a first upper mold that surrounds the upper half of the tube to be formed from the outside, the upper end surface of the first lower mold is tightly fitted with the lower end surface of the first upper mold, The inner side wall at the fitting position of the first lower mold forms a first lower curved surface, the inner side wall at the fitting position of the first upper mold forms a first upper curved surface, and the first corrugated groove is formed together on the inner side of the fitting position of the first lower mold and the first upper mold.

4. The corrugated tube forming device according to claim 1, characterized in that: The bellows forming device comprises: The second mold has a second corrugated groove on its inner wall to provide a space for deformation based on the first corrugation under the action of an external force. The second mold includes a second lower mold that surrounds the lower half of the tube to be formed from the outside, and a second upper mold that surrounds the upper half of the tube to be formed from the outside. The upper end surface of the second lower mold is tightly fitted with the lower end surface of the second upper mold. The inner side wall at the second lower mold half-mold bonding position forms a second lower curved surface, the inner side wall at the second upper mold half-mold bonding position forms a second upper curved surface, and the inner side of the second lower mold half-mold and the second upper mold half-mold bonding position together forms the second corrugated groove; The extrusion ring also includes a second extrusion ring. The second extrusion ring is arranged in the annular space, its position corresponds to the second corrugated groove, and its shape is adapted to the second corrugated groove. When external force is applied to the second extrusion ring, the first corrugation is deformed outward by the force and forms a second corrugation with the cooperation of the second corrugated groove.

5. The corrugated tube forming device according to claim 1, characterized in that: The bellows forming device comprises: The first clamping block is located between the first upper mold and the second lower mold. The first clamping block has a concave clamping groove in the middle of the inner side, and the shape of the clamping groove is adapted to the second corrugation; the curved surface below the clamping groove and the first lower curved surface in the first lower mold form a first corrugated groove; the curved surface above the clamping groove and the first upper curved surface in the first upper mold form a first corrugated groove.

6. The corrugated tube forming device according to claim 1, characterized in that: The bellows forming device comprises: The second clamping block has a recessed clamping groove in the middle of the inner side of the second clamping block, and the shape of the clamping groove is adapted to the second corrugation; the curved surface below the clamping groove and the second lower curved surface in the second lower half mold form a second corrugated groove; the curved surface above the clamping groove and the second upper curved surface in the second upper half mold form a second corrugated groove.

7. The corrugated tube forming device according to claim 1, characterized in that: The wall thickness of the lower half mold near the corrugated groove is greater than the wall thickness of other parts, and the wall thickness of the upper half mold near the corrugated groove is greater than the wall thickness of other parts.

8. The corrugated tube forming device according to claim 1, characterized in that: The inner diameter of the first lower curved surface gradually increases from bottom to top, and the inner diameter of the first upper curved surface gradually decreases from bottom to top. The first lower curved surface and the first upper curved surface are symmetrically arranged in the horizontal direction.

9. The corrugated tube forming device according to claim 1, characterized in that: The mold is arranged between the upper mold plate and the lower mold plate, and the mold comprises a first mold plate and a second mold plate. A supporting ring is arranged between the upper mold plate and the mold, and a supporting ring is also arranged between the lower mold plate and the mold.

10. The corrugated tube forming device according to claim 1, characterized in that: The mold jacket comprises a lower mold jacket and an upper mold jacket, wherein the lower mold jacket embraces the lower mold from the outside, and the upper mold jacket embraces the upper mold from the outside, The wall thickness of the lower mold jacket gradually increases from top to bottom, and the wall thickness of the upper mold jacket gradually increases from bottom to top, so that the outer wall of the mold jacket is perpendicular to the template, so that the mold jacket can stably surround the tube to be formed under the action of external force.

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