Hydraulic forming die structure for corrugated pipe and die mounting and demounting method

Abstract

The application provides a bellows hydraulic forming die structure and a die mounting and dismounting method, which comprises the following steps: a circular groove is arranged on the top end of a base to support the bottom end of a product, the base is provided with a detachable opening in the radial direction, and the product is slid along the opening direction to be demoulded; a plurality of guide columns are arranged on the base and extend upward; a plurality of die piece assemblies are vertically arranged and slidably connected to the guide columns; the die piece assembly is composed of two half-rings with semicircular inner walls and is connected to form a ring with a circular inner wall, one end of the two half-rings is hinged, the other end is clamped to each other and is positioned by a locking structure; the openings of the plurality of die piece assemblies are arranged in the same direction as the opening of the base; the plurality of guide columns are connected to the same half-ring; a hanging assembly is used to vertically movably connect adjacent die piece assemblies; and a plug is installed above the product. The application has the effects that the demoulding of the large-diameter bellows is more convenient, each die piece does not need to be dismounted, and the steps in the die mounting and dismounting process are reduced.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic forming technology, specifically, it relates to a hydraulic forming mold structure for large-diameter corrugated pipes and a mold loading and unloading method. Background Technology

[0002] Large-diameter, multi-layered, high-performance corrugated pipes are widely used in launch vehicle propulsion systems and other applications. With the rapid development of high-capacity launch vehicles, the diameter of related corrugated pipes is also increasing. Multi-layered, high-performance corrugated pipes are mainly produced using an integral hydroforming process. This process yields corrugated pipes with good dimensional and mechanical properties, but the mold structure is complex and the assembly / disassembly process is cumbersome. As the diameter of the corrugated pipe increases, traditional forming mold structures and operating methods no longer meet the requirements for efficient production.

[0003] Patent document CN107952859A discloses a detachable hydraulic bulging mold for manufacturing S-shaped metal corrugated pipes, including a lower mold base, a tube blank and guide pillars mounted on the upper mold base, the guide pillars being located on both sides of the tube blank, an upper mold base being provided on the top of the tube blank and guide pillars, two semi-circular lower fixed molds being snapped onto the tube blank and guide pillars, and an upper moving mold, a separable intermediate moving mold, and a lower fixed mold being snapped onto the tube blank and guide pillars from top to bottom above the lower fixed molds; an upper mold base injection hole is opened on the top of the upper mold base, and a lower mold base injection hole is opened on the lower mold base; the separable upper moving mold, the separable intermediate moving mold, and the separable lower moving mold are fixed by set screws to form a separable moving mold, and multiple pairs of separable moving molds, together with the upper moving mold and the lower fixed mold, can form a complete waveform of the S-shaped corrugated pipe. After forming, after removing the set screws, the separable intermediate moving mold, the separable upper moving mold, and the separable lower moving mold can be removed from the formed S-shaped corrugated pipe in sequence without damage.

[0004] Patent document CN107952859A states that each module needs to be installed individually during assembly. When the number of corrugations is large and the diameter is large, the disassembly and assembly process is cumbersome, relies on a lot of manual operation, and has low production efficiency.

[0005] To facilitate the demolding of large-diameter corrugated pipes without disassembling each mold piece, thus reducing the steps involved in mold assembly and disassembly, this invention designs a corrugated pipe hydroforming mold structure and a mold assembly and disassembly method, solving the aforementioned problems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a bellows hydraulic forming mold structure and a mold loading and unloading method.

[0007] According to the present invention, a bellows hydroforming mold structure includes: a base, a guide post, a mold plate assembly, a lifting assembly, and a plug; A circular groove is provided at the top of the base to support the bottom of the product, and the base has a detachable opening in the radial direction, allowing the product to slide and be demolded along the opening. Multiple guide posts are installed on the base and extend upwards; Multiple module components are arranged vertically and slidably connected to the guide pillars; The module assembly is composed of two semi-circular inner walls joined together to form a ring with a circular inner wall. The two semi-circular rings are hinged at one end and interlocked at the other end and positioned by a locking structure. Several module component openings are aligned with the base opening; Multiple guide posts are connected to the same half-ring; The lifting assembly vertically connects adjacent module assemblies. When a module assembly is in the lifting state, one module assembly is located at the upper end of the lifting assembly, and the other module assembly is located at the lower end of the lifting assembly, with a gap between adjacent module assemblies. When a module assembly is in the pressure state, the module assemblies move closer to each other along the guide post, and the lifting assembly and the module assembly are fitted with a clearance. The cap is installed on top of the product.

[0008] Preferably, the base includes a base body, a movable insert, and a pin; The base is rectangular in shape, with a circular groove at the top of the base. The movable insert is horizontally slidably connected to the opening of the cavity and spliced ​​to the base body. The base body and the movable insert form a circular groove to support the bellows. One pin is provided on each side of the base body. The pins are inserted and connected between the movable insert and the base body. The insertion direction of the pins is perpendicular to the sliding direction of the movable insert along the horizontal plane, thus fixing the movable insert.

[0009] Preferably, a groove is formed on the contact surface between the base body and the movable insert.

[0010] Preferably, the mold assembly includes a rear mold and a front mold; A semi-circular notch is formed on the inner side of the rear half mold, and through holes are opened at both ends of the rear half mold for the rear half mold to be fitted and vertically slidably connected to the guide post; A semi-circular notch is formed on the inner side of the front half mold. One end of the front half mold is hinged to one end of the rear half mold in the horizontal direction, and the other end of the front half mold is spliced ​​to the other end of the rear half mold. The splicing ends of the front half mold and the rear half mold are connected by a locking structure.

[0011] Preferably, the locking structure includes a connecting rod, a locking plate, a countersunk screw, and a pin; The connecting rod rotates horizontally and is connected to the rear half mold, close to the splicing end between the rear half mold and the front half mold, and the connecting rod extends horizontally outward. The locking plate is fixed to the upper surface of the connecting rod by countersunk screws and pins; the splicing end of the front half mold has a contact foot, which is horizontally offset from the connecting rod. The contact foot and the locking plate are at the same horizontal height. When the locking structure is in the locked state, the locking plate abuts against the end of the contact foot away from the rear half mold. The contact surface between the locking plate and the contact foot is an arc surface with the rotating end of the connecting rod as the axis. The locking plate and the contact foot are interference fit, and the locking plate is not allowed to be opened by expansion force when the bellows is formed.

[0012] Preferably, the rear half mold is provided with a bushing, which is fixed to both ends of the rear half mold, and the front half mold is fitted with and rotatably connected to one end of the bushing. The connecting rod is fitted with and rotatably connected to the bushing at the other end; The bushing has a vertically opened circular hole for the guide post to pass through, and the bushing is connected to the guide post for lifting.

[0013] Preferably, multiple sets of the lifting assemblies are arranged between two adjacent module assemblies, and the lifting assemblies are symmetrical about the center of the module assembly; Multiple sets of suspension components are staggered.

[0014] Preferably, the lifting assembly includes a lifting ring and a bolt; The lifting rings are vertically set on two adjacent rear half molds and front half molds. Each front half mold is connected to each adjacent front half mold with two lifting rings, and each rear half mold is connected to each adjacent rear half mold with two lifting rings. Several lifting rings are symmetrically arranged at the center, and all lifting rings are of equal length; Bolts are inserted into and slide on both ends of the lifting ring, and bolts are screwed into the corresponding rear half mold or front half mold.

[0015] According to the present invention, a method for loading and unloading a bellows hydraulic forming mold is provided, which employs the aforementioned bellows hydraulic forming mold structure, and includes the following steps: Step S1: Preform assembly before molding: Lift the uppermost mold assembly, and lift the lower mold assemblies together via the lifting rings; open the locking structures of all mold assemblies and open the half-rings of the mold assemblies; place the preform into the mold cavity and insert it into the base; close all mold assemblies and tighten the locking structures; Step S2: Remove the corrugated tube after molding: Open the locking structure of all the mold components and open the half ring of the mold components; open the base opening; remove the corrugated tube.

[0016] Preferably, in step S1: the length of the lifting assembly is changed between the module assemblies to adjust the spacing between the lifted module assemblies so that the spacing conforms to the size of the corrugated pipe.

[0017] According to the present invention, an aircraft adopts the aforementioned bellows hydraulic forming mold structure and mold loading and unloading method.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This invention innovates the structure of the integral hydraulic forming mold for corrugated pipes by differentiating the functions of the mold components. One side is responsible for positioning, and the other side is responsible for opening and closing. This eliminates the need to disassemble both sides of the mold components, enabling convenient assembly and disassembly of the mold during the integral hydraulic forming of large-diameter corrugated pipes, and significantly improving the efficiency of integral hydraulic forming of large-diameter corrugated pipes. Attached Figure Description

[0019] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Fig. 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Fig. 2 This is a schematic diagram of the module assembly of the present invention.

[0021] Fig. 3 This is a schematic diagram of the base of the present invention.

[0022] The diagram shows: 1. Mold assembly; 11. Rear mold half; 12. Front mold half; 2. Lifting ring; 3. Bolt; 4. Base; 41. Base body; 42. Movable insert; 43. Pin; 5. Guide post; 6. End cap; 13. Bushing; 14. Connecting rod; 15. Locking plate; 16. Countersunk screw; 17. Pin. Detailed Implementation

[0023] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0024] like Figs. 1-3 As shown, a corrugated pipe hydroforming mold structure includes a base 4, a guide post 5, a mold assembly 1, a lifting assembly, and a plug 6.

[0025] A circular groove is formed at the top of the base 4 to support the bottom of the product. The base 4 has a detachable opening in the radial direction, allowing the product to slide and be demolded along the opening. Multiple guide pillars 5 are provided on the base 4 and extend upwards. Multiple mold plate assemblies 1 are arranged vertically and slidably connected to the guide pillars 5. The openings of several mold plate assemblies 1 are aligned with the openings of the base 4. The mold assembly 1 consists of two semi-circular inner walls joined together to form a circular inner ring. One end of each semi-ring is hinged, and the other end is interlocked and positioned by a locking structure. Multiple guide posts 5 are connected to the same semi-ring. A lifting assembly vertically connects adjacent mold assemblies 1. When the mold assembly 1 is in a lifting state, one mold assembly 1 is located at the upper end of the lifting assembly, and the other mold assembly 1 is located at the lower end of the lifting assembly, with a gap between adjacent mold assemblies. When the mold assembly 1 is under pressure, the mold assemblies 1 move closer together along the guide posts 5, and the lifting assembly and the mold assembly 1 are fitted with a clearance fit. A cap 6 is installed on top of the product.

[0026] The basic working principle of this application is as follows: when the template assembly 1 is in the lifting state, the tube blank is placed inside the template assembly 1. After the plug 6 is closed, the corrugated pipe is formed by applying pressure to the template assembly 1. Compared with the traditional corrugated pipe removal work, which requires complete disassembly of the outer ring to remove the corrugated pipe, this application makes the disassembly trajectory of the template assembly 1 stable and convenient for disassembly and assembly by using the spliced ​​template assembly 1. The guide post 5 keeps the position of the template assembly 1 stable after disassembly and assembly. Through the cooperation of the two and the improvement of the base 4, the corrugated pipe can be removed from the side by only partially disassembling the template assembly 1, which significantly optimizes the disassembly complexity.

[0027] Furthermore, the base 4 includes a base body 41, a movable insert 42, and pins 43. The base body 41 is rectangular, with a circular groove at its top. The movable insert 42 is horizontally slidably connected to the opening of the cavity and joined to the base body 41, forming a circular groove to support the bellows. One pin 43 is provided on each side of the base body 41, and each pin 43 is inserted into and connected between the movable insert 42 and the base body 41. The outer diameter of the pin 43 is clearance-fitted with the through-hole size of the base body 41, and the insertion direction of the pin 43 is perpendicular to the sliding direction of the movable insert 42 along the horizontal plane, thus fixing the movable insert 42. After the pin 43 is pulled out, the movable insert 42 can be removed, and the base body 41 and the movable insert 42 form a quick-release assembly connected by the pins 43.

[0028] Preferably, a groove is provided on the contact surface between the base body 41 and the movable insert 42, thereby reducing the contact area and the friction when pulling out.

[0029] The mold assembly 1 includes a rear half mold 11 and a front half mold 12. A semi-circular notch is formed on the inner side of the rear half mold 11, and through holes are opened at both ends of the rear half mold 11 for fitting and vertically sliding connection to the guide post 5. A semi-circular notch is formed on the inner side of the front half mold 12, one end of the front half mold 12 is hinged to one end of the rear half mold 11, and the other end of the front half mold 12 is spliced ​​with the other end of the rear half mold 11 to form a cylindrical cavity with a diameter of 600mm to accommodate the tube blank. The spliced ​​ends of the front half mold 12 and the rear half mold 11 are connected by a locking structure.

[0030] The locking structure includes a connecting rod 14, a locking plate 15, a countersunk screw 16, and a pin 17. The connecting rod 14 is rotatably connected to the rear half mold 11 in the horizontal direction and is close to the splicing end between the rear half mold 11 and the front half mold 12. The connecting rod 14 extends horizontally outward. The locking plate 15 is fixed to the upper surface of the connecting rod 14 by the countersunk screw 16 and the pin 17. A contact foot is formed at the splicing end of the front half mold 12. The contact foot is horizontally offset from the connecting rod 14, and the contact foot and the locking plate 15 are at the same horizontal height. When the locking structure is in the locked state, the locking plate 15 abuts against the end of the contact foot away from the rear half mold 11. The contact surface between the locking plate 15 and the contact foot is an arc surface with the rotating end of the connecting rod 14 as the axis. The locking plate 15 and the contact foot are interference-fitted, and the locking plate 15 is not allowed to be opened by expansion force during the forming of the bellows.

[0031] Preferably, bushings 13 are fitted into the through holes at both ends of the rear half mold 11. The bushings 13 are fixed to both ends of the rear half mold 11. The guide post 5 passes through the bushings 13, and the bushings 13 are flexibly connected to the guide post 5, allowing the rear half mold 11 to slide smoothly up and down along the guide post 5 without jamming. The bushing 13 is fitted into and rotatably connected to one end of the front half mold 12. The outer surface of the bushing 13 has a stepped structure and is press-fitted with the rear half mold 11 to form an interference fit, ensuring that the bushing 13 does not come out. The bushing 13 has a countersunk stepped structure and forms a gap fit with the front half mold 12. The front half mold 12 is rotatably connected to the rear half mold 11 by the bushing 13. The connecting rod 14 is fitted into and rotatably connected to the bushing 13 at the other end. The bushing 13 has a countersunk stepped structure and forms a gap fit with the front half mold 12. The connecting rod 14 is rotatably connected to the rear half mold 11 by the bushing 13.

[0032] Preferably, the connection between the rear half mold 11, the front half mold 12 and the bushing 13 is rounded to increase the strength of the mold.

[0033] Multiple lifting assemblies are arranged between two adjacent mold assembly 1s, and the lifting assemblies are symmetrical about the center of the mold assembly 1 to facilitate balance. The multiple lifting assemblies are staggered. The lifting assembly includes lifting rings 2 and bolts 3. The lifting rings 2 vertically connect adjacent rear mold halves 11 and front mold halves 12. Each front mold halves 121 is connected to two lifting rings 2 with each adjacent front mold halves 12, and each rear mold halves 11 is connected to two lifting rings 2 with each adjacent rear mold halves 11. Several lifting rings 2 are symmetrically arranged about the central axis of the mold assembly 1 cavity, and all lifting rings 2 are of equal length. Bolts 3 are inserted into and slide on both ends of the lifting rings 2, and bolts 3 are screwed to the rear mold halves 11 or the front mold halves 12. After lifting, the distance between adjacent mold assembly 1s is 40mm. The topmost mold assembly 1 can be equipped with a lifting point for easy lifting.

[0034] A groove is provided along the lifting ring 2 for the bolt 3 to slide. By changing the lifting ring of different lengths, the length of the groove can be changed, thereby changing the maximum sliding distance of the bolt 3 in the groove of the lifting ring 2, and thus changing the spacing between the adjusting module assemblies 1.

[0035] During the pre-forming tube blank assembly, the entire mold is placed on the hydraulic press platform. The uppermost mold assembly 1 is lifted by the hydraulic press slider. At this time, all mold assemblies 1 are lifted through the lifting rings 2, with a spacing of 40mm between the mold pieces. Then, the locking plates 15 of all mold assemblies 1 are opened, and the front half of the mold 12 is opened. The tube blank is placed into the mold cavity, and the front half of the mold 12 of all mold assemblies 1 is closed, along with all the locking plates 15. Finally, the cap 6 is placed on the upper end of the tube blank.

[0036] When removing the corrugated pipe after molding, first remove the plug 6, then open the locking piece 15 of the mold assembly 1, open the front half mold 12, and then pull out the two pins 43 on both sides of the base 4 to pull out the movable insert 42. At this time, the front half of the corrugated pipe is not blocked by the mold, and the corrugated pipe can be easily removed.

[0037] This embodiment also provides a method for loading and unloading a bellows hydraulic forming mold, used with the above-mentioned bellows hydraulic forming mold structure, the steps of which include: Step S1: Preform assembly: Lift the uppermost mold assembly 1, and lift the lower mold assembly 1 together with it via the lifting ring 2; open the locking plates 15 of all mold assembly 1 and open the front half mold 12; put the preform into the mold cavity and insert it into the base 4; close all the front half molds 12 and lock the locking plates 15.

[0038] Preferably, the spacing between the mold components 1 after being lifted is adjusted by changing the length of the lifting ring 2 between them, so that the spacing meets the requirements for corrugated pipe forming, thus eliminating the steps of installing and removing the mold components 1 during the forming process.

[0039] Step S2: Remove the corrugated tube after molding: Open the locking plates 15 of all mold components 1 and open the front half mold 12; pull out the pin 43 and remove the movable insert 42; remove the corrugated tube.

[0040] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A bellows hydraulic forming mold structure, characterized in that, include: Base (4), guide post (5), template assembly (1), lifting assembly and plug (6); The base (4) has a circular groove at the top to support the bottom of the product. The base (4) has a detachable opening in the radial direction, and the product slides along the opening direction to be demolded. Multiple guide posts (5) are provided on the base (4) and extend upward; Multiple module components (1) are arranged vertically and slidably connected to the guide post (5); The template assembly (1) is composed of two semi-circular inner walls joined together to form a ring with a circular inner wall. One end of the two semi-circular rings is hinged together, and the other end is snapped together and positioned by a locking structure. The openings of several module components (1) are arranged in the same direction as the openings of the base (4); Multiple guide posts (5) are connected to the same half ring; The lifting assembly vertically connects adjacent module assemblies (1). When the module assembly (1) is in the lifting state, one module assembly (1) is located at the upper end of the lifting assembly, and the other module assembly (1) is located at the lower end of the lifting assembly, forming a gap between adjacent module assemblies. When the module assembly (1) is in the pressure state, the module assemblies (1) move closer to each other along the guide post (5), and the lifting assembly and the module assembly (1) are fitted with a clearance. The plug (6) is installed on top of the product.

2. The bellows hydraulic forming die structure according to claim 1, characterized in that, The base (4) includes a base body (41), a movable insert (42), and a pin (43). The base body (41) is rectangular, and a circular groove is opened at the top of the base body (41); The movable insert (42) is horizontally slidably connected to the opening of the cavity and spliced ​​to the base body (41). The base body (41) and the movable insert (42) form a circular groove to support the bellows. One pin (43) is provided on each side of the base body (41). The pin (43) is inserted and connected between the movable insert (42) and the base body (41). The insertion direction of the pin (43) is perpendicular to the sliding direction of the movable insert (42) along the horizontal plane, thus fixing the movable insert (42).

3. The bellows hydraulic forming die structure according to claim 2, characterized in that, A groove is provided on the contact surface between the base body (41) and the movable insert (42).

4. The bellows hydraulic forming die structure according to claim 3, characterized in that, The template assembly (1) includes a rear half mold (11) and a front half mold (12). A semi-circular notch is formed on the inner side of the rear half mold (11), and through holes are provided at both ends of the rear half mold (11) for the rear half mold (11) to be fitted and vertically slidably connected to the guide post (5). A semi-circular notch is formed on the inner side of the front half mold (12). One end of the front half mold (12) is hinged to one end of the rear half mold (11) in the horizontal direction. The other end of the front half mold (12) is spliced ​​to the other end of the rear half mold (11). The splicing ends of the front half mold (12) and the rear half mold (11) are connected by a locking structure.

5. The bellows hydraulic forming die structure according to claim 4, characterized in that, The locking structure includes a connecting rod (14), a locking plate (15), a countersunk screw (16), and a pin (17). The connecting rod (14) is rotatably connected to the rear half mold (11) in the horizontal direction and close to the splicing end of the rear half mold (11) and the front half mold (12). The connecting rod (14) extends horizontally outward. The locking plate (15) is fixed to the upper surface of the connecting rod (14) by countersunk screws (16) and pins (17); the splicing end of the front half mold (12) forms a contact foot, the contact foot is horizontally offset from the connecting rod (14), the contact foot and the locking plate (15) are at the same horizontal height, when the locking structure is in the locked state, the locking plate (15) abuts against the end of the contact foot away from the rear half mold (11); The contact surface between the locking plate (15) and the contact foot is an arc surface with the rotating end of the connecting rod (14) as the axis. The locking plate (15) and the contact foot are interference fit, and the locking plate (15) is not allowed to be opened by the expansion force when the bellows is formed.

6. The bellows hydraulic forming die structure according to claim 5, characterized in that, The through holes at both ends of the rear half mold (11) are fitted with bushings (13), which are fixed to both ends of the rear half mold (11). The guide post (5) passes through the bushings (13), and the bushings (13) are connected to the guide post (5) in a lifting manner. The front half mold (12) is fitted with and rotatedly connected to the bushing (13) at one end; The connecting rod (14) is fitted with and rotatably connected to the bushing (13) at the other end. The bushing (13) has a vertically opened round hole for the guide post (5) to pass through, and the bushing (13) is raised and lowered to connect to the guide post (5).

7. The bellows hydroforming die structure according to claim 1, characterized in that, Multiple sets of the lifting components are arranged between two adjacent module components (1), and the lifting components are symmetrical about the center of the module component (1); Multiple sets of suspension components are staggered.

8. The bellows hydroforming die structure according to claim 7, characterized in that, The lifting assembly includes a lifting ring (2) and a bolt (3); The lifting rings (2) are vertically arranged on two adjacent rear half molds (11) and front half molds (12). Each front half mold (12) is connected to each adjacent front half mold (12) with two lifting rings (2). Each rear half mold (11) is connected to each adjacent rear half mold (11) with two lifting rings (2). Several lifting rings (2) are arranged symmetrically at the center, and the lengths of the lifting rings (2) are all equal; Bolts (3) are inserted into and slide on both ends of the lifting ring (2), and bolts (3) are screwed into the corresponding rear half mold (11) or front half mold (12).

9. A method for loading and unloading a bellows hydraulic forming mold, employing the bellows hydraulic forming mold structure according to any one of claims 1-8, characterized in that the steps include... include: Step S1: Preform assembly: Lift the uppermost mold assembly (1), and lift the lower mold assembly (1) together with it through the lifting ring (2); open the locking structure of all mold assemblies (1) and open the half ring of the mold assembly (1); put the preform into the mold cavity and insert it into the base (4); close all mold assemblies (1) and lock the locking structure; Step S2: Remove the corrugated tube after molding: Open the locking structure of all the mold components (1) and open the half ring of the mold components (1); open the opening of the base (4); remove the corrugated tube.

10. The method for loading and unloading a bellows hydraulic forming mold according to claim 9, characterized in that, In step S1: the length of the lifting assembly is changed between the template assemblies (1) to adjust the spacing of the lifted template assemblies (1) so that the spacing conforms to the size of the corrugated pipe.

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