CN112845750A - Device and method for hydraulic forming of ultra-large-diameter corrugated pipe - Google Patents
Device and method for hydraulic forming of ultra-large-diameter corrugated pipe Download PDFInfo
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- CN112845750A CN112845750A CN202110365387.0A CN202110365387A CN112845750A CN 112845750 A CN112845750 A CN 112845750A CN 202110365387 A CN202110365387 A CN 202110365387A CN 112845750 A CN112845750 A CN 112845750A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D15/00—Corrugating tubes
- B21D15/04—Corrugating tubes transversely, e.g. helically
- B21D15/10—Corrugating tubes transversely, e.g. helically by applying fluid pressure
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Abstract
A device and a method for hydraulic forming of an ultra-large diameter corrugated pipe are characterized in that the device comprises: the device comprises a press platform (1), a shell ring (2), a sealing lantern ring (3), a combined outer die (4), an inner sleeve (5), a steel pipe (6), a sealing cover plate (7), a water inlet/outlet pipe (8) and an exhaust pipe (9). The invention has the advantages of simple tool, convenient realization, quick and convenient operation, high forming precision, uniform stress distribution after forming, good repeatability and low cost. The invention can greatly reduce the requirement of thrust applied to equipment during the hydraulic forming of the ultra-large-diameter corrugated pipe, realizes the integral one-step hydraulic forming of the ultra-large-diameter corrugated pipe with smaller pressure, and ensures the smooth operation of the work.
Description
Technical Field
The invention relates to a corrugated pipe processing method, in particular to a forming technology of a large-caliber corrugated pipe with the caliber of more than 3000 millimeters, and specifically relates to a device and a method for hydraulic forming of an ultra-large-caliber corrugated pipe.
Background
As the corrugated pipe is used as a flexible element, with the technical progress, the requirements of pipelines, pressure vessels and the like on the specification of the corrugated pipe are increased, and the requirements on the forming of the corrugated pipe are increased.
At present, the mode selected at home and abroad is basically roll forming, but the roll forming has the defects of low forming precision, great damage to the surface of the corrugated pipe, uneven stress distribution of the formed corrugated pipe and great limitation to the use of the corrugated pipe. At present, the requirements of the forming quality and the forming mode of the corrugated pipe are higher and higher by domestic and foreign design parties.
And when the hydraulic forming is adopted, the forming precision is high, the shape correction and surface treatment are not needed after the forming, and the stress distribution is uniform. However, the caliber of the corrugated pipe is overlarge, so that the pressure for deformation of the corrugated pipe needs to be extremely high, and at present, China rarely has a large-specification and large-pressure press to realize. The cost and time are very large!
Disclosure of Invention
The invention aims to design a device for hydraulic forming of an ultra-large-diameter corrugated pipe by using water pressure and provide a corresponding forming method aiming at the problems that the existing roller forming ultra-large-diameter corrugated pipe is low in forming precision, large in damage to the surface of the corrugated pipe and uneven in stress distribution of the formed corrugated pipe.
One of the technical schemes of the invention is as follows:
the utility model provides a device of super large-diameter bellows hydraulic forming which characterized by: the hydraulic press comprises a press platform 1, a shell ring 2, a sealing lantern ring 3 combined external mold 4, an internal sleeve 5, a steel pipe 6, a sealing cover plate 7, a water inlet/outlet pipe 8 and an exhaust pipe 9, wherein the press platform 1 is connected with the shell ring 2, the lower end of the shell ring 2 is connected with the sealing lantern ring 3 in a welding mode, the sealing lantern ring 3 is sleeved on the upper end of the internal sleeve 5 in a sealing mode and can move up and down along the outer wall of the internal sleeve 5, the sealing lantern ring 3 is pressed on the upper opening of the steel pipe 6 and seals the upper opening at the same time, the lower end of the internal sleeve 5 is connected with the sealing cover plate 7, the lower end of the internal sleeve 5 is inserted into the steel pipe 6 and sealed at the lower end of the steel pipe 6 through the sealing cover plate 7, a water pressure cavity 10 is formed between the; the outer side of the steel pipe 6 is provided with a corrugated forming die 4, the forming die 4 is provided with a limiting block 11 before the press platform 1 presses down and the corrugated section is formed, and the limiting block is removed when the steel pipe deforms to form the corrugated section and can support the forming die 4.
The forming die 4 is formed by stacking a plurality of modules, each module is provided with a half step body matched with the corrugations, before the modules are pressed, the modules are supported and isolated through limiting blocks, the forming die 4 is of a half structure, and the forming die is wrapped on the surface of a steel pipe after die assembly is carried out from two sides.
The corrugated pipe is a steel pipe 6 before molding; an inner sleeve 5 is sleeved in the steel pipe before forming, the inner sleeve 5 is welded with a sealing cover plate 7, the sealing sleeve ring 3 and the sealing cover plate 7 seal the upper end face and the lower end face of the steel pipe, the sealing sleeve ring 3 is tightly matched with the steel pipe, the press platform 1 applies pressure to the sealing sleeve ring 3 through the cylinder section 2, the water inlet/outlet pipe 8 injects water into cavities of the steel pipe and the inner sleeve 5 to form internal pressure, the steel pipe deforms, and the forming die 4 limits the shape of the deformed steel pipe.
Thrust is applied to the two ends of the corrugated pipe through equipment, and the pressure for forming the corrugated pipe is increased, so that the corrugated pipe is formed hydraulically; the larger the caliber of the corrugated pipe is, the larger the contact area between the liquid and the end part is, so that the larger the thrust applied by the equipment is; the stress area is reduced by adding the inner sleeve 5, so that the thrust required to be applied to two ends of equipment during the forming of the corrugated pipe is greatly reduced; the press platform 1 applies pressure to the sealing sleeve ring 3 through the shell ring 2, the sealing sleeve ring 3 axially displaces along the inner sleeve 5 and drives the combined outer die 4 to carry out die assembly, and therefore the forming state and the precision of the corrugated pipe are guaranteed; in order to ensure the forming pressure to be stable, the excess water is discharged from the water inlet/outlet pipe 8.
The water inlet/outlet pipe 8 and the exhaust pipe 9 are arranged in 180 degrees to inject water and exhaust gas to the maximum extent; before and during the forming process, the water inlet/outlet pipe 8 injects water into the cavity, the exhaust pipe 9 exhausts air, after the pressure is stable, the exhaust pipe 9 is locked, and after the forming is finished, the water inlet/outlet pipe 8 exhausts water for the water outlet.
The second technical scheme of the invention is as follows:
a corrugated pipe forming method based on a hydraulic forming device for an ultra-large-diameter corrugated pipe is characterized by comprising the following steps: the method comprises the following steps:
firstly, injecting water into the cavities of the steel pipe and the inner sleeve 5 through the water inlet/outlet pipe 8 to form internal pressure, exhausting the air through the exhaust pipe 9, locking the exhaust pipe 9 after the water is full, increasing the pressure to the designed forming pressure and stabilizing the forming pressure;
secondly, after the forming pressure is stable, the press platform 1 applies pressure to the sealing lantern ring 3 through the cylinder section 2, the sealing lantern ring 3 axially displaces along the inner sleeve 5, and the combined outer die 4 is driven to be matched; in the process, the excess water is discharged from the exhaust pipe 9, so that the forming pressure in the cavity of the corrugated pipe 6 is ensured;
thirdly, the forming external mold 4 is matched in place, the corrugated pipe 6 is formed preliminarily, when the forming modules can be supported by the bulge formed by the deformation of the outer wall of the steel pipe, the limiting block 11 supported between the forming modules is taken out, and the redundant water is discharged out of the cavity from the water inlet/outlet pipe 8 in the pressing process;
finally, the press platform 1 drives the sealing lantern ring 3 to continuously press down along the outer wall of the inner sleeve 5 through the cylinder section 2 until gaps among the forming modules disappear; the molded corrugated tube was taken out and subjected to dimensional and appearance inspection.
The number of the limiting blocks is at least four between every two molding modules, and each half molding module is supported by at least two limiting blocks.
The invention has the beneficial effects that:
the invention has the advantages of high forming precision, good effect, uniform stress distribution after the corrugated pipe is formed and simple steps. The thrust at the two ends of the required equipment is greatly reduced, and the time and the cost are greatly reduced.
The invention can greatly reduce the effective area of liquid contacting with the end part when the ultra-large diameter corrugated pipe is formed, so that the forming process is controllable, the technical design of ultra-large diameter hydraulic forming is realized, the forming precision of the ultra-large diameter corrugated pipe is ensured, the integral forming is realized, one step is in place, and the production efficiency and the material utilization rate are improved.
Drawings
FIG. 1 is a schematic view of the hydroforming apparatus of the present invention before it is operated.
FIG. 2 is a schematic view of the hydroforming apparatus according to the present invention after the end of forming.
Detailed Description
The invention is further described below with reference to the figures and examples.
The first embodiment.
As shown in fig. 1-2.
A device for hydraulic forming of a corrugated pipe with an ultra-large diameter comprises a press platform 1, a cylinder section 2, a sealing lantern ring 3 combined external mold 4, an internal sleeve 5, a steel pipe 6, a sealing cover plate 7, a water inlet/outlet pipe 8 and an exhaust pipe 9, as shown in fig. 1, the press platform 1 is connected with the shell ring 2, the lower end of the shell ring 2 is connected with the sealing ring 3 in a welding way, the sealing ring 3 is sleeved on the upper end of the inner sleeve 5 in a sealing way and can move up and down along the outer wall of the inner sleeve 5, the sealing ring 3 is pressed on the upper opening of the steel pipe 6 and seals the upper opening at the same time, the lower end of the inner sleeve 5 is connected with the sealing cover plate 7, the lower end of the inner sleeve 5 is inserted into the steel pipe 6 and realizes the sealing of the lower end of the steel pipe 6 through the sealing cover plate 7, a water pressure cavity 10 is formed between, the lower end of the water pressure cavity 10 is connected with a water inlet/outlet 8, and the upper end is connected with an exhaust pipe 9; the outer side of the steel pipe 6 is provided with a corrugated forming die 4, the forming die 4 is provided with a limiting block 11 before the press platform 1 presses down and the corrugated section is formed, and the limiting block is detached when the steel pipe 6 deforms to form the corrugated section and can support the forming die 4. The forming die 4 is formed by stacking a plurality of modules, each module is provided with a half step body matched with the corrugations, before the modules are pressed, the modules are supported and isolated through limiting blocks (4 blocks are generally adopted between every two layers, and each half module is supported by two limiting blocks), and the forming die 4 is of a half structure and wraps the surface of the steel pipe after being assembled from two sides. The bellows shown in fig. 2 is a steel tube 6 before being formed; an inner sleeve 5 is sleeved in the steel pipe before forming, the inner sleeve 5 is welded with a sealing cover plate 7, the sealing sleeve ring 3 and the sealing cover plate 7 seal the upper end face and the lower end face of the steel pipe, the sealing sleeve ring 3 is tightly matched with the steel pipe, the press platform 1 applies pressure to the sealing sleeve ring 3 through the cylinder section 2, the water inlet/outlet pipe 8 injects water into cavities of the steel pipe and the inner sleeve 5 to form internal pressure, the steel pipe deforms, and the forming die 4 limits the shape of the deformed steel pipe. When the corrugated pipe hydraulic forming machine works, thrust is applied to two ends of the corrugated pipe through hydraulic equipment, and the forming pressure of the corrugated pipe is increased, so that the corrugated pipe is formed hydraulically; the larger the caliber of the corrugated pipe is, the larger the contact area between the liquid and the end part is, so that the larger the thrust applied by the equipment is, therefore, the invention reduces the stress area by adding the inner sleeve 5, so that the thrust required to be applied by the two ends of the equipment when the corrugated pipe is formed is greatly reduced; the press platform 1 applies pressure to the sealing sleeve ring 3 through the shell ring 2, the sealing sleeve ring 3 axially displaces along the inner sleeve 5 and drives the combined outer die 4 to carry out die assembly, and therefore the forming state and the precision of the corrugated pipe are guaranteed; in order to ensure the forming pressure to be stable, the excess water is discharged from the water inlet/outlet pipe 8. In specific implementation, the water inlet/outlet pipe 8 and the exhaust pipe 9 are preferably arranged in an angle of 180 degrees to inject water and exhaust gas to the maximum extent; before and during the forming process, the water inlet/outlet pipe 8 injects water into the cavity, the exhaust pipe 9 exhausts air, after the pressure is stable, the exhaust pipe 9 is locked, and after the forming is finished, the water inlet/outlet pipe 8 exhausts water for the water outlet.
The key point of the invention is that the effective stress area of the two ends in contact is reduced by the existence of the inner sleeve, thereby realizing the one-time hydraulic integral molding of the ultra-large caliber corrugated pipe with extremely low pressure.
Example two.
As shown in fig. 1-2.
A corrugated pipe forming method based on an ultra-large-diameter corrugated pipe hydraulic forming device comprises the following steps:
firstly, the forming device of the first embodiment is arranged on a steel pipe 6 shown in fig. 1 in a large scale, a mold closing device (colorful and conventional technologies, such as hydraulic propulsion, pneumatic propulsion, lever propulsion and the like, and preferably, the device is linked with a sealing lantern ring 3, the sealing lantern ring 3 moves downwards, and the forming mold is linked and gradually closed) is utilized to push the forming mold to wrap the steel pipe 6, as shown in fig. 1, after the preparation for working and finishing, water can be injected into cavities of the steel pipe 6 and an inner sleeve 5 through a water inlet/outlet pipe 8 to form internal pressure, an exhaust pipe 9 exhausts air, and after the water is full, the exhaust pipe 9 is locked, the pressure is increased to the designed forming pressure, and the forming pressure is stable;
secondly, after the forming pressure is stable, the press platform 1 applies pressure to the sealing lantern ring 3 through the cylinder section 2, the sealing lantern ring 3 axially displaces along the inner sleeve 5, and the combined outer die 4 is driven to be matched; in the process, the excess water is discharged from the exhaust pipe 9, so that the forming pressure in the cavity of the corrugated pipe 6 is ensured;
thirdly, the forming die 4 is matched in place, the corrugated pipe 6 is formed preliminarily, when the forming die blocks can be supported by the protrusions formed by the deformation of the outer wall of the steel pipe, the limiting block 11 supported between the forming die blocks is taken out, and redundant water is discharged out of the cavity from the overflow valve on the water inlet/outlet pipe 8 in the pressing process; the number of the limiting blocks is at least four between every two molding modules, and each half molding module is supported by at least two limiting blocks.
Finally, the press platform 1 drives the sealing lantern ring 3 to continuously press down along the outer wall of the inner sleeve 5 through the cylinder section 2 until gaps among the forming modules disappear, as shown in fig. 2; the molded corrugated tube was taken out and subjected to dimensional and appearance inspection.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (7)
1. The utility model provides a device of super large-diameter bellows hydraulic forming which characterized by: the hydraulic press comprises a press platform (1), a shell ring (2), a sealing sleeve ring (3), a combined outer die (4), an inner sleeve (5), a steel pipe (6), a sealing cover plate (7), a water inlet/outlet pipe (8) and an exhaust pipe (9), wherein the press platform (1) is connected with the shell ring (2), the lower end of the shell ring (2) is connected with the sealing sleeve ring (3) in a welding way, the sealing sleeve ring (3) is sleeved on the upper end of the inner sleeve (5) in a sealing way and can move up and down along the outer wall of the inner sleeve (5), the sealing sleeve ring (3) is pressed on the upper opening of the steel pipe (6) and seals the upper opening at the same time, the lower end of the inner sleeve (5) is connected with the sealing cover plate (7), the lower end of the inner sleeve (5) is inserted into the steel pipe (6) and realizes the sealing of the lower end of the steel pipe (6) through the sealing, the lower end of the water pressure cavity (10) is connected with a water inlet/outlet (8), and the upper end is connected with an exhaust pipe (9); the corrugated forming die (4) is arranged on the outer side of the steel pipe (6), a limiting block (11) is arranged on the forming die (4) before the press platform (1) presses down and the corrugated section is formed, and the limiting block is detached when the steel pipe deforms to form the corrugated section and can support the forming die (4).
2. The apparatus for hydroforming a bellows according to claim 1, wherein: the forming die (4) is formed by stacking a plurality of modules, each module is provided with a half step body matched with the corrugations, the modules are supported and isolated by limiting blocks before being pressed, and the forming die (4) is of a half structure and wraps the surface of the steel pipe after being assembled from two sides.
3. The apparatus for hydroforming a bellows according to claim 1, wherein: the corrugated pipe is a steel pipe (6) before being molded; inner skleeve (5) are emboliaed to the inside of steel pipe before the shaping, inner skleeve (5) and sealed apron (7) welding, the upper and lower terminal surface of sealed steel pipe of sealed lantern ring (3) and sealed apron (7), sealed lantern ring (3) and steel pipe closely cooperate, press platform (1) is through shell ring (2) to sealed lantern ring (3) applied pressure, advance/outlet pipe (8) to the cavity water injection formation internal pressure of steel pipe and inner skleeve (5), make the steel pipe warp, forming die (4) restriction steel pipe shape of warping.
4. The apparatus for hydroforming a bellows according to claim 1, wherein: thrust is applied to the two ends of the corrugated pipe through equipment, and the pressure for forming the corrugated pipe is increased, so that the corrugated pipe is formed hydraulically; the larger the caliber of the corrugated pipe is, the larger the contact area between the liquid and the end part is, so that the larger the thrust applied by the equipment is; the stress area is reduced by adding the inner sleeve (5), so that the thrust required to be applied to two ends of equipment during the forming of the corrugated pipe is greatly reduced; the press platform (1) applies pressure to the sealing sleeve ring (3) through the shell ring (2), the sealing sleeve ring (3) axially displaces along the inner sleeve (5) and drives the combined outer die (4) to carry out die assembly, and therefore the forming state and the precision of the corrugated pipe are guaranteed; in order to ensure the forming pressure to be stable, the excess water is discharged from the water inlet/outlet pipe (8).
5. The apparatus for hydroforming a bellows according to claim 1, wherein: the water inlet/outlet pipe (8) and the exhaust pipe (9) are arranged in 180 degrees to inject water and exhaust gas to the maximum extent; before and during the forming process, the water inlet/outlet pipe (8) injects water into the cavity, the exhaust pipe (9) exhausts air, after the pressure is stable, the exhaust pipe (9) is locked, and after the forming is finished, the water inlet/outlet pipe (8) exhausts water for the water outlet.
6. A bellows forming method based on the ultra-large caliber bellows hydraulic forming device of claim 1, which is characterized in that: the method comprises the following steps:
firstly, injecting water into cavities of the steel pipe and the inner sleeve (5) through a water inlet/outlet pipe (8) to form internal pressure, exhausting the air through an exhaust pipe (9), locking the exhaust pipe (9) after the water is full, increasing the pressure to the designed forming pressure and stabilizing the forming pressure;
secondly, after the forming pressure is stable, the press platform (1) applies pressure to the sealing sleeve ring (3) through the shell ring (2), the sealing sleeve ring (3) axially displaces along the inner sleeve (5), and the combined outer die (4) is driven to be matched; in the process, the excess water is discharged from the exhaust pipe (9) to ensure the forming pressure in the cavity of the corrugated pipe (6);
thirdly, the forming external mold (4) is matched in place, the corrugated pipe (6) is formed preliminarily, when the forming modules can be supported by the protrusions formed by the deformation of the outer wall of the steel pipe, the limiting blocks (11) supported between the forming modules are taken out, and redundant water is discharged out of the cavity from the water inlet/outlet pipe (8) in the pressing process;
finally, the press platform (1) drives the sealing sleeve ring (3) to continue to press down along the outer wall of the inner sleeve (5) through the cylinder section (2) until gaps among the forming modules disappear; the molded corrugated tube was taken out and subjected to dimensional and appearance inspection.
7. The bellows method of claim 6, wherein: the number of the limiting blocks is at least four between every two molding modules, and each half molding module is supported by at least two limiting blocks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110365387.0A CN112845750A (en) | 2021-04-06 | 2021-04-06 | Device and method for hydraulic forming of ultra-large-diameter corrugated pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110365387.0A CN112845750A (en) | 2021-04-06 | 2021-04-06 | Device and method for hydraulic forming of ultra-large-diameter corrugated pipe |
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| Publication Number | Publication Date |
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| CN112845750A true CN112845750A (en) | 2021-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110365387.0A Withdrawn CN112845750A (en) | 2021-04-06 | 2021-04-06 | Device and method for hydraulic forming of ultra-large-diameter corrugated pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118321413A (en) * | 2024-06-11 | 2024-07-12 | 四川省工业设备安装集团有限公司 | Forming device and forming method for oversized stainless steel corrugated pipe |
-
2021
- 2021-04-06 CN CN202110365387.0A patent/CN112845750A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118321413A (en) * | 2024-06-11 | 2024-07-12 | 四川省工业设备安装集团有限公司 | Forming device and forming method for oversized stainless steel corrugated pipe |
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