Corrugated pipe forming device

Abstract

The utility model 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; and the mold jacket is arranged on the outer side of the first mold. And the corrugated forming precision is improved while the corrugated pipe of the specific specification is customized conveniently.

Description

Technical Field

[0001] This utility model relates to the aerospace field. Specifically, it relates to a corrugated pipe forming device. Background Technology

[0002] Corrugated pipes are mainly used to compensate for pipeline thermal deformation, dampen vibrations, and absorb pipeline settlement deformation. To meet the performance requirements of equipment, specific specifications of corrugated pipes are needed to meet the operational needs of specific locations, and the consistency requirements for these specific specifications are high. Traditionally, manufacturing corrugated pipes requires complete sets of equipment, which are typically suitable for mass production of corrugated pipes of a certain specification, but cannot meet the manufacturing needs of specific specifications. Such complete sets of equipment are costly and have long commissioning cycles. Utility Model Content

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

[0004] To solve the above problems, this utility model adopts the following technical solution: a corrugated pipe forming device, characterized in that it includes: a template, including a lower template and an upper template arranged opposite each other in a vertical direction; a positioning part, the positioning part being fixedly connected to the template, the positioning part including: a lower positioning part that penetrates into the inside of the pipe to be formed from below and abuts against the inner wall of the pipe to be formed, and an upper positioning part that penetrates into the inside of the pipe to be formed from above and abuts against its inner wall, wherein the lower positioning part includes a first connecting part that cooperates with the lower template, a first punch that extends upward from the first connecting part into the inside of the pipe to be formed and abuts against its inner wall, and a second punch that extends upward from the first punch, the radial dimension of the second punch being smaller than the radial dimension of the first punch, the upper positioning part... The part includes a second connecting part that mates with the upper template on a horizontal plane, and a concave die that is inserted into the tube to be formed from above and abuts against the inner wall of the tube. The concave die has a hollow space. The top part of the second punch extends into the hollow space and fits tightly against the inner wall of the hollow space, forming an annular space that can accommodate the extrusion ring. The first mold has a first corrugated groove on its inner wall to provide space for the tube to be formed to deform outward under external force. The extrusion ring includes a first extrusion ring, which is disposed 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 force and forms the first corrugation with the cooperation of the first corrugated groove. The mold outer sleeve is disposed on the outside of the first mold to provide an inward clamping force.

[0005] Furthermore, the upper and lower templates have through holes extending vertically, and the templates and the positioning part are fixedly connected through the through holes to fix the tube to be formed on the templates along the horizontal plane.

[0006] Furthermore, the first mold includes 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 face of the first lower mold is in close contact with the lower end face of the first upper mold. The inner sidewall of the first lower mold at the contact position forms a first lower curved surface, and the inner sidewall of the first upper mold at the contact position forms a first upper curved surface. The first corrugated groove is formed together on the inner side of the contact area of ​​the first lower mold and the first upper mold.

[0007] Further, the corrugated pipe forming device includes: a second mold, the inner wall of which has a second corrugated groove to provide space for deformation based on the first corrugation under external force; the second mold includes a second lower mold that surrounds the lower half of the pipe to be formed from the outside, and a second upper mold that surrounds the upper half of the pipe to be formed from the outside; the upper end face of the second lower mold is in close contact with the lower end face of the second upper mold; wherein the inner sidewall of the second lower mold at the contact position forms a second lower curved surface, and the inner sidewall of the second upper mold at the contact position forms a second upper curved surface, and the second corrugated groove is formed together on the inner side of the contact area of ​​the second lower mold and the second upper mold; the extrusion ring also includes a second extrusion ring, which is disposed in the annular space, its position corresponding to the second corrugated groove, and its shape adapted to the second corrugated groove; when an external force is applied to the second extrusion ring, the first corrugation is deformed outward under force, and forms the second corrugation 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 has a recessed clamping groove in the middle of its inner side, and the shape of the clamping groove is adapted to the second corrugation; the curved surface below the clamping groove forms a first corrugated groove with the first lower curved surface in the first lower half mold; the curved surface above the clamping groove forms a first corrugated groove with the first upper curved surface in the first upper half mold.

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

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

[0012] Furthermore, the mold is set between the upper template and the lower template, and the mold includes a first mold and a second mold. A material support ring is provided between the upper template and the mold, and a material support ring is also provided between the lower template and the mold.

[0013] Furthermore, the mold jacket includes a lower mold jacket and an upper mold jacket. The lower mold jacket hugs the lower mold from the outside, and the upper mold jacket hugs 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 stably surrounds the tube to be formed under the action of external force.

[0014] Compared with existing technologies, this invention improves the precision of corrugation forming while customizing corrugated pipes of specific specifications.

[0015] Compared with the prior art, this utility model can achieve greater consistency in the shape of the corrugated pipe while customizing it to a specific specification. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the description of the embodiments or 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 those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 This is a cross-sectional structural diagram of the corrugated pipe forming device in a specific embodiment of the present invention;

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

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

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

[0021] Figure 5 This is a structural diagram of the second card block in a specific embodiment of the present invention.

[0022] Figure label:

[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. Die; 4. First mold; 4-1. First lower half mold; 4-2. First upper half mold; 5. Support; 6. First lower curved surface; 7. First corrugated groove; 8. First upper curved surface; 9. First corrugation; 10. Second mold; 10-1. Second lower half mold; 10-2. Second upper half mold; 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 half mold outer sleeve; 18. Upper half mold outer sleeve; 19. First extrusion ring; 20. Second extrusion ring; 21. Material support ring. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] To facilitate understanding of the embodiments of this utility model, the following will provide further explanation and description with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the scope of protection of this utility model.

[0026] Corrugated pipes are widely used in aerospace and other fields. The corrugated pipes used in these fields are complex and diverse. In some cases, to meet the performance requirements of equipment, specific specifications of corrugated pipes are needed to meet the operational needs of specific aerospace locations. This typically requires the manufacture of corrugated pipes of various specifications, such as different pipe path dimensions and different spacing between corrugations, which increases the difficulty of corrugated pipe forming. Traditionally, corrugated pipe manufacturing requires complete sets of equipment, which are usually suitable for mass production of corrugated pipes of a certain specification, but cannot meet the manufacturing needs of corrugated pipes of specific specifications. To meet the manufacturing needs of corrugated pipes of specific specifications, such as... Figure 1 As shown in the figure, this specific embodiment provides a corrugated pipe forming device for customizing corrugated pipes of specific specifications, effectively solving the problem of urgently needing corrugated pipes of specific specifications in emergency situations. The corrugated pipe 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, which are vertically opposite each other, forming a space between them for longitudinally placing the tube to be formed and other components of the forming device. The lower template 1-1 and upper template 1-2 have through holes extending vertically. The lower positioning part 2 and upper positioning part 3 of the forming device are connected to the lower and upper templates respectively through these through holes, so that the lower and upper positioning parts are fixedly connected to the templates in the horizontal direction. Preferably, a bracket 5 is provided on the lower template 1-1 to facilitate the placement of the forming device on a mechanical pressure operating table or other equipment for forming operations, preventing the forming device from shaking during pressure application and affecting forming accuracy.

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

[0029] The first punch 2-2 extends upward from the first connecting part 2-1, and the height of the first punch 2-2 is less than the height of the tube to be formed. The outer surface of the first punch 2-2 is adapted to the shape of the inner wall of the tube to be formed. When the first punch 2-2 is housed in the tube to be formed, the outer wall of the first punch 2-2 and the inner wall of the tube to be formed are tightly fitted together, and the bottom surface of the first punch 2-2 is tightly fitted to the upper surface of the lower template 1-1. Thus, the lower positioning part 2 restricts the position of the tube to be formed on the horizontal plane, that is, restricts the displacement of the tube to be formed relative to the lower template 1-1 on the horizontal plane, so that the tube to be formed is stably set on the lower template.

[0030] In this specific embodiment, both the first punch 2-2 and the second punch 2-3 are columnar, adapted to the inner wall shape of the tube to be formed. Furthermore, the first punch 2-2 and the second punch 2-3 can have various shapes, allowing them 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 that of the first punch 2-2. The second punch 2-3 and the upper positioning part 3 are accommodated in the part inside the tube to be formed.

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

[0033] The die 3-2 extends downward from the second connecting part 3-1. The lower end of the die has an opening, which extends upward to form a hollow space. The upper end of the second punch 2-3 penetrates into the hollow space and fits tightly against the inner wall of the hollow space, forming an annular space capable of accommodating the extrusion ring. The upper positioning part 2 and the lower positioning part 3, respectively, restrict relative movement between the tube to be formed and the upper and lower templates 1-2 and 1-1 of the forming device on the horizontal plane. Simultaneously, the second punch 2-3 of the lower positioning part 2 and the portion of the die in the upper positioning part 3 abut against each other, strengthening the limiting force on the tube in the middle of the tube to be formed. This prevents relative movement between the tube and other components in the forming device, ensuring the tube is stably positioned outside the upper and lower positioning parts, which is beneficial for accurately forming the tube into the desired corrugations.

[0034] Furthermore, the radial dimensions of the lower positioning part 2 and the upper positioning part 3 have various specifications. When it is necessary to form a corrugated pipe of different sizes, the upper positioning part and the lower positioning part corresponding to the size of the pipe to be formed can be flexibly replaced without replacing other structures in the forming device. This improves the application flexibility of the forming device while 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. The inner diameter of both molds is adapted to the outer diameter of the tube to be formed.

[0036] When the first lower mold half 4-1 and the first upper mold half 4-2 simultaneously surround the tube to be formed from the outside, the upper end face of the lower mold half and the lower end face of the upper mold half are tightly fitted together, and the inner walls of both are tightly fitted to the outer wall of the tube to be formed. The inner walls of the first lower mold half 4-1 and the first upper mold half 4-2 have preset corrugated grooves, that is, there is a forming space outside the position where the tube to be formed needs to be corrugated. Specifically, the top of the side wall of the first lower mold half 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 of the side wall of the first upper mold half 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 symmetrically arranged in the horizontal direction, and the first lower curved surface 6 and the first upper curved surface 8 together form a first corrugated groove 7 on the inner side of the fitting part of the first lower mold half 4-1 and the first upper mold half 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 curved surface 6 and the first upper curved surface 8 during mechanical pressure molding, the wall thickness of the first lower mold 4-1 and the first upper mold 4-2 near the first lower curved surface 6 and the first upper curved surface 8 is thicker than other parts.

[0037] Furthermore, the first lower curved surface 6 in the first lower mold 4-1 and the first upper curved surface 8 in the first upper mold 4-2 preferably have multiple specifications. When it is necessary to process corrugated pipes with other corrugated dimensions, the lower mold and the upper mold with the corresponding first lower curved surface 6 and the first upper curved surface 8 can be flexibly replaced, which improves the adaptability of the forming 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 fitted onto the outside of the first punch 2-2 in the lower positioning part 2, and the first lower half mold 4-1 and the first upper half mold 4-2 are then sequentially wrapped around the tube to be formed from the outside. At this time, the first corrugated groove 7 is formed together at the contact area 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, so that the outer wall of the concave mold 3-2 in the upper positioning part 3 is tightly fitted with the inner wall of the tube to be formed, while the inner wall of the bottom end of the concave mold abuts against the outer wall of the top end of the second punch 2-3 in the punch 2-2, thereby fixing the tube to be formed on the forming device in the horizontal direction.

[0039] Then, a first extrusion ring 19 is provided on the inner side of the tube to be formed, corresponding to the first lower curved surface 6 and the first upper curved surface 8. That is, the first extrusion ring is located in the annular space outside the second punch 2-3. Furthermore, 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 is completed, that is, the preliminary forming is completed. Figure 2 As shown.

[0040] Furthermore, the first extrusion ring is preferably made of polyurethane, which facilitates uniform stress on the tube to be formed under internal extrusion pressure, contributing to the consistency of the corrugated shape. Even further, a material support ring 21 is preferably provided at the contact points between the lower mold 4-1 and the upper mold 4-2 and the template 1, which can prevent the tube to be formed from direct contact with the template 1 during the forming process and thus prevent wear.

[0041] In this specific embodiment, after the first forming of the corrugations is completed, the first mold 4 is replaced with the second mold 10 to correct and form the first corrugations 9. For example... 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. The upper end face of the second lower mold is in close contact with the lower end face of the second upper mold.

[0042] A second lower curved surface 12 extends downward from the top of the sidewall of the second lower mold 10-1, with its inner diameter gradually increasing from bottom to top. A second upper curved surface 13 extends upward from the bottom of the sidewall of the second upper mold 10-2, with its inner diameter gradually decreasing 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 together they form a second corrugated groove 11 on the inner side of the mating area of ​​the second lower mold 10-1 and the second upper mold 10-2.

[0043] A second extrusion ring 20 is provided on the inner side of the tube to be formed, corresponding to the second lower curved surface 12 and the second upper curved surface 13. That is, the second extrusion ring is located within 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 external force is applied to the second extrusion ring, the first corrugation 9 undergoes a second forming process, i.e., correction forming, to form the second corrugation 14. The second corrugation 14 is the formed corrugation, and at this point, the initial correction forming of the first corrugation 9 is completed.

[0044] After obtaining the formed corrugation, i.e., the second corrugation 14, a first locking block 15 is set on the outside of this formed corrugation, such as... Figure 4 As shown. The first card block 15 has a recessed card groove in the middle of its inner side, and the shape of the card groove is adapted to the second corrugation 14; the curved surface below the card groove forms a first corrugated groove 7 with the first lower curved surface 6 in the first lower half mold 4-1; the curved surface above the card groove forms a first corrugated groove 7 with the first upper curved surface 8 in the first upper half mold 4-2.

[0045] In this way, after the first forming corrugation, namely the second corrugation 14, is processed, when repeating the first forming step, the tube to be formed, which has been partially formed into the second corrugation 14, can be firmly held by the first clamping block 15, while the other parts of the tube to be formed can be repeated for the second forming step.

[0046] When the first locking block 15 engages with the partially formed tube to be formed, the first mold 4 is respectively positioned at the upper and lower ends of the tube to be formed. Specifically, the upper end face of the first lower mold half 4-1 is fitted with the lower end face of the first locking block 15, and the lower end face of the first upper mold half 4-2 is fitted with the upper end face of the first locking block 15. This arrangement forms a first corrugated groove 7 both above and below the first locking block 15. At this time, under the action of external force, the first forming process of the tube to be formed is repeated through the combined action of the first locking block 15 and the first mold 4.

[0047] Then, the second forming, or correction forming, step is repeated, replacing the first locking block 15 with the second locking block 16. The inner wall of the second locking block has a locking groove, the shape of which is adapted to the shape of the second corrugated groove 11, such as... Figure 5 As shown. When the second clamping block 16 engages with the tube to be formed, the second mold 10 is respectively placed at the upper and lower ends of the tube to be formed, thus forming a second corrugated groove 11 at both the upper and lower ends of the second clamping block. At this time, the second forming operation is repeated in the same way as the first second forming, and finally multiple forming corrugations, i.e., second corrugations 14, are obtained.

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

[0049] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A corrugated pipe forming device, characterized in that, include: The template includes a lower template and an upper template that are set opposite each other in the vertical direction; The positioning part is fixedly connected to the template. The positioning part includes: a lower positioning part that extends into 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 extends into the tube to be formed from above and abuts against the inner wall of the tube to be formed. The lower positioning part includes a first connecting part that mates with the lower template, a first punch that extends upward from the first connecting part into the interior of the tube to be formed and abuts against its inner wall, and a second punch that extends upward from the first punch, wherein the radial dimension of the second punch is smaller than the radial dimension of the first punch. The upper positioning part includes a second connecting part that mates with the upper template on a horizontal plane, and a concave die that is inserted into the tube to be formed from above and abuts against the inner wall of the tube to be formed. The concave die has a hollow space. The top part of the second punch extends into the hollow space and fits tightly against the inner wall of the hollow space, forming an annular space that can accommodate the extrusion ring. A first mold, the inner wall of which has a first corrugated groove to provide space for the tube to be formed to deform into its shape under the action of external force; The extrusion ring includes a first extrusion ring, which is disposed in the annular space and its position corresponds to the first corrugated groove. 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 forms the first corrugation with the cooperation of the first corrugated groove. A mold jacket is disposed on the outside of the first mold to provide an inward clamping force.

2. The corrugated pipe forming apparatus according to claim 1, characterized in that, The upper and lower templates have through holes that extend vertically. The templates and the positioning part are fixedly connected through the through holes to fix the tube to be formed on the templates along the horizontal plane.

3. The corrugated pipe forming apparatus according to claim 1, characterized in that, The first mold includes 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 face of the first lower mold is in close contact with the lower end face of the first upper mold. The inner wall of the first lower half mold at the bonding position forms a first lower curved surface, the inner wall of the first upper half mold at the bonding position forms a first upper curved surface, and the first corrugated groove is formed together on the inner side of the bonding part of the first lower half mold and the first upper half mold.

4. The corrugated pipe forming apparatus according to claim 1, characterized in that, The corrugated pipe forming device includes: The second mold has a second corrugated groove on its inner wall to provide space for deformation based on the first corrugation under 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 face of the second lower mold is in close contact with the lower end face of the second upper mold. Wherein, the inner sidewall at the second lower half mold fitting position forms a second lower curved surface, the inner sidewall at the second upper half mold fitting position forms a second upper curved surface, and the second corrugated groove is formed together on the inner side of the fitting part 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 disposed in the annular space, its position corresponds to the second corrugated groove, and its shape is adapted to the second corrugated groove. When an external force is applied to the second extrusion ring, the first corrugation is deformed by the force and forms a second corrugation with the cooperation of the second corrugated groove.

5. The corrugated pipe forming apparatus according to claim 1, characterized in that, The corrugated pipe forming device includes: The first card block is located between the first upper half mold and the second lower half mold. The inner center of the first card block has a recessed card groove, the shape of which is adapted to the second corrugation. The curved surface below the card groove forms a first corrugated groove with the first lower curved surface in the first lower half mold. The curved surface above the card groove forms a first corrugated groove with the first upper curved surface in the first upper half mold.

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

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

8. The corrugated pipe forming apparatus 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 pipe forming apparatus according to claim 1, characterized in that, The mold is set between the upper template and the lower template. The mold includes a first mold and a second mold. A material support ring is provided between the upper template and the mold, and a material support ring is also provided between the lower template and the mold.

10. The corrugated pipe forming apparatus according to claim 1, characterized in that, The mold jacket includes a lower mold jacket and an upper mold jacket. The lower mold jacket hugs the lower mold from the outside, and the upper mold jacket hugs 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 stably surrounds the tube to be formed under the action of external force.

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