CN111672928A - Novel method for compositely forming metal corrugated pipe with special-shaped contour - Google Patents
Novel method for compositely forming metal corrugated pipe with special-shaped contour Download PDFInfo
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- CN111672928A CN111672928A CN202010531329.6A CN202010531329A CN111672928A CN 111672928 A CN111672928 A CN 111672928A CN 202010531329 A CN202010531329 A CN 202010531329A CN 111672928 A CN111672928 A CN 111672928A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/0803—Making tubes with welded or soldered seams the tubes having a special shape, e.g. polygonal tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/156—Making tubes with wall irregularities
- B21C37/158—Protrusions, e.g. dimples
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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
- B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
- B21D13/04—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by rolling
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- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
A new method for composite forming of metal corrugated pipes comprises the following steps; placing the plate in a rolling forming die, starting rolling at a position which is a certain distance away from the front end of the plate, and stopping rolling at a position which is a certain distance away from the tail end of the plate to obtain a corrugated plate with two undeformed ends and a corrugated middle; placing a corrugated plate in a bending mould for bending, wherein in the forming process, the front end of the plate is clamped by a clamping block and a bending mould insert to rotate around the center of a bending mould, so that the corrugated plate is bent and formed to obtain a required bending angle, the rear end of the corrugated plate is pressed on an anti-wrinkling block by a pressing block, and other bent angles are formed by adopting the same method; welding the head end and the tail end of a corrugated plate with a bend angle without corrugation to obtain a semi-finished corrugated pipe; and (3) placing the welded corrugated pipe semi-finished product into a rolling die, and forming the unformed corrugated part of the corrugated pipe semi-finished product into a corrugated pipe by a rolling process to obtain the corrugated pipe finished product. The invention has the characteristics of high production efficiency and low cost.
Description
Technical Field
The invention relates to the technical field of metal plastic forming, in particular to a novel method for compositely forming a metal corrugated pipe with a special-shaped outline.
Background
The metal corrugated pipe is an axisymmetric rotating thin shell with a corrugated shape, can change the shape and size under the action of external loads (concentrated force, pressure, moment and the like) as an elastic element, and can recover the original shape after the load is unloaded. Common forming methods for corrugated tubing include mechanical bulging, hydraulic bulging, and roll forming. However, the three methods for forming the corrugated pipe are mainly suitable for forming the cylindrical corrugated pipe, and have certain limitations for forming the special-shaped (such as rectangular and racetrack) corrugated pipe: if the wall thickness of the tube blank is excessively reduced, the wave form at the corner is not filled enough, the die is difficult to process, the manufacturing cost is high, and the like easily occur. At present, the corrugated pipe is manufactured by adopting a method of welding after sectional forming, but the method has low efficiency and poor quality of a welding seam.
Disclosure of Invention
The invention aims to provide a novel method for compositely forming the special-shaped profile metal corrugated pipe, which can form the special-shaped corrugated pipe with different section shapes and sizes and has the characteristics of high production efficiency and good product quality.
In order to achieve the purpose, the invention adopts the technical scheme that:
a new method for compositely forming a metal corrugated pipe with a special-shaped outline comprises the following steps;
1) corrugation roll forming:
placing the plate in a rolling forming die, starting rolling by an upper roller and a lower roller at a certain distance (the distance is determined according to the size) from the front end of the plate, and stopping rolling at a certain distance from the tail end of the plate to finally obtain a corrugated plate with two undeformed ends and a corrugated middle;
2) winding and bending the corrugated plate:
placing the corrugated plate obtained in the step 1 in a bending mould for bending, wherein in the forming process, the clamping block and the bending mould insert block clamp the front end of the plate to rotate around the center of a bending mould, so that the corrugated plate is bent to form a required bending angle, the rear end of the corrugated plate is pressed on the anti-wrinkling block by a pressing block, and other bending angles are formed by adopting the same method, wherein the number of the bending angles is equal to the number of the fillets of the corrugated pipe;
3) welding and forming:
welding the head end and the tail end of the corrugated plate with the bent angle, which are obtained in the step (2), without corrugation, and if the two ends are not parallel and level, welding the corrugated plate in a clamp to obtain a semi-finished product of the corrugated pipe;
4) roll forming of unformed sections:
and (4) placing the corrugated pipe semi-finished product welded in the step (3) into a rolling die, and forming the unformed corrugated part of the corrugated pipe semi-finished product into corrugated pipes by a rolling process to obtain the corrugated pipe finished product.
The roller in the step 1 has the same waveform size as the corrugated pipe, when the corrugated pipe is formed, the length direction of the plate is perpendicular to the axis of the roller, the plate is fed into the upper roller and the lower roller, the upper roller and the lower roller rotate at a constant speed, the upper roller moves downwards at the same time, the plate is gradually pressed into the lower roller, and the plate is formed into a desired corrugated shape.
In the step 1, a plurality of roller discs with the same size are arranged on the upper roller and the lower roller, the contact surface of each roller disc and the plate is a semi-circular arc surface with the radius equal to the radius of a wave trough fillet of the corrugated pipe, and the distance between every two adjacent roller discs is the diameter of a wave crest of the corrugated pipe.
In the step 2, the contact surface of the bending mould and the plate has the corrugation with the same shape and size as the corrugated plate obtained by the rolling forming in the step 1, and the radius of the bending mould is the same as the radius of the fillet of the corrugated pipe.
And 2, the number of the bent angles is consistent with the number of the round corners of the corrugated pipe, and the positions of the bent angles are determined according to the size of the corrugated pipe.
And 4, when forming, firstly taking the lower roller off the roller press, sleeving the semi-finished product of the corrugated pipe on the lower roller, enabling the inner surface of the unformed section of the semi-finished product of the corrugated pipe to be attached to the lower roller, then re-installing the lower roller on the roller press, pressing the upper roller down to be in contact with the outer surface of the unformed section, simultaneously rotating the upper roller and the lower roller, pressing the upper roller down, and rolling the unformed part of the semi-finished product of the corrugated pipe to form the required corrugations to obtain the finished product of the corrugated pipe.
In the step 1, the distance between the front end of the plate and the tail end of the plate is 10-20 mm, and the distance between the front end of the plate and the tail end of the plate is 10-20 mm.
The invention has the beneficial effects that:
the method can directly roll the sheet material into the corrugations, and a plurality of corrugations can be formed at one time;
the method can form corrugated pipes with different cross section shapes, such as rectangle and runway shapes;
in the method, the corrugations are obtained by rolling and forming the plate, the reduction rate of the plate is small, the thickness of the corrugations is uniform, and the rigidity and the fatigue life of the corrugated pipe can be improved;
the method can carry out the batch production of the corrugated pipes without replacing equipment and a die under the condition that the sizes of the corrugations are the same, and has high production efficiency and low cost.
Drawings
Fig. 1 is a flow chart of a metal corrugated pipe composite forming process.
Fig. 2 is a schematic diagram of corrugated plate roll forming.
Figure 3 is a schematic view of a corrugated board after it has been formed.
Fig. 4 is a schematic diagram of the forming of the corrugated round corners by bending.
Figure 5 is a schematic view after the formation of the corrugation corners.
FIG. 6 is a schematic view of a post-crimp welded closure
Fig. 7 is a three-dimensional view of a finished rectangular metal corrugated pipe.
Fig. 8 is a front view of a finished rectangular metal corrugated pipe.
Fig. 9 is a top view of a finished rectangular metal corrugated pipe.
Fig. 10 is a three-dimensional view of a finished racetrack-shaped metal corrugated pipe.
Fig. 11 is a front view of a finished racetrack metal bellows.
Fig. 12 is a top view of the finished racetrack metal bellows.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A new method for compositely forming a metal corrugated pipe with a special-shaped outline comprises the following steps;
1) corrugation roll forming:
and (5) calculating the required plate size according to the size of the corrugated pipe, and blanking. Placing the plate into a rolling forming die, wherein the roller has the same waveform size as the corrugated pipe, and when forming, enabling the length direction of the plate to be perpendicular to the axis of the roller, feeding the plate into an upper roller and a lower roller, enabling the upper roller and the lower roller to rotate at a constant speed, enabling the upper roller to move downwards at the same time, gradually pressing the plate into the lower roller, and forming the plate into a desired corrugated shape; fig. 2 is a schematic diagram illustrating the principle of corrugated plate roll forming. During rolling, rolling is performed at a certain distance from the front end of the plate (the distance depends on the size), and rolling is stopped at a certain distance from the tail end of the plate, so that a corrugated plate (shown in figure 3) with two ends being not deformed and a corrugated part in the middle is obtained. The head and tail sections are left to be not rolled, so that the purpose is to facilitate subsequent welding.
The upper and lower rollers are provided with a plurality of roller discs with the same size, the number of the roller discs is equal to the wave number of the corrugated pipe, the contact surface of each roller disc and the plate is a semi-circular arc surface with the radius equal to the radius of a wave trough fillet of the corrugated pipe, and the distance between every two adjacent roller discs is the diameter of a wave crest of the corrugated pipe.
2) Winding and bending the corrugated plate:
and (3) placing the corrugated plate obtained in the step (1) in a bending mould for bending, wherein the contact surface of the bending mould and the plate has the corrugations with the same shape and size as those of the corrugated plate obtained in the step (1) through rolling forming, the radius of the bending mould is the same as that of the fillet of the corrugated pipe, and fig. 4 is a corrugated fillet bending forming schematic diagram. At first with buckled plate front end clamp between bending die insert and the tight piece of clamp, the buckled plate rear end is pressed on the crease-resistance piece by the briquetting, prevents buckled plate rear end warpage and corrugate, and the bending die begins to rotate around the center, and it is rotatory around the bending die center to press from both sides tight piece and the bending die insert centre gripping panel front end simultaneously, and the buckled plate pastes gradually and leans on the bending die, until obtaining required bending angle, finally obtains the buckled plate of taking the bent angle as shown in figure 5. And forming other bent angles by the same method, wherein the number of the bent angles is consistent with that of the round corners of the corrugated pipe, and the positions of the bent angles are determined according to the size of the corrugated pipe.
3) Welding and forming:
and (3) flattening straight edge sections at two ends of the corrugated plate without the corrugation, which is obtained in the step (2), flattening the straight edge sections, welding the straight edge sections, and if the two ends are not parallel, welding the straight edge sections in a clamp to obtain a semi-finished product of the corrugated pipe, wherein the semi-finished product of the corrugated pipe is shown in figure 6.
4) Roll forming of unformed sections:
and (4) putting the corrugated pipe semi-finished product welded in the step (3) into a rolling die to roll the unformed corrugated section. When in forming, the lower roller is taken down from the roller press, the semi-finished product of the corrugated pipe is sleeved on the lower roller, the inner surface of the unformed section of the semi-finished product of the corrugated pipe is attached to the lower roller, then the lower roller is installed on the roller press again, the upper roller presses downwards to be in contact with the outer surface of the unformed section, the upper roller and the lower roller rotate simultaneously, the upper roller presses downwards simultaneously, and the unformed part of the semi-finished product of the corrugated pipe is rolled to form the required corrugation, so that the finished product of the corrugated pipe is obtained.
Example 1
The 304 stainless steel rectangular corrugated pipe has a simplified structure as shown in fig. 7, 8 and 9.
The bellows dimensions were as follows: the total length L is 260mm, and the lengths L of straight line segments at two ends of the corrugated pipe1The wave height H is 35mm, the wave distance W is 60mm, the fillet radius R of the corrugated pipe is 15mm, the length a of the rectangular straight edge of the cross section of the corrugated pipe is 100mm, and the wave trough radius R is 100mm (the four straight edges are equal)115mm, crest radius R215mm, 4 wave number N and 0.8mm wall thickness t.
1) Corrugation roll forming:
calculating the blank size of the corrugated pipe to be 483mm multiplied by 495mm (length multiplied by width) of the plate, placing the plate in a rolling forming die, wherein the roller has the same wave shape size with the corrugated pipe, the contact surface of each roller disc in the upper roller and the lower roller and the plate is a semi-circular arc surface with the radius equal to 15mm according to the size of the corrugated pipe, and the distance between each roller disc is 30 mm. When forming, the edge of the sheet material with the length of 483mm is vertical to the axis of the roller, the sheet material is sent into the upper roller and the lower roller, the upper roller and the lower roller rotate at a constant speed, the upper roller moves downwards at the same time, the sheet material is gradually pressed into the lower roller, and the sheet material is formed into the required corrugated shape; fig. 2 is a schematic diagram illustrating the principle of corrugated plate roll forming. And rolling the corrugated plate 10mm away from the front end of the plate during rolling, and stopping rolling the corrugated plate 10mm away from the tail end of the plate to finally obtain the corrugated plate with two undeformed ends and corrugated middle, as shown in figure 3. And the head and tail sections are left to be not rolled, so that the subsequent welding is facilitated.
2) Winding and bending the corrugated plate:
and (3) placing the corrugated plate obtained in the step (1) into a bending mould for bending, wherein the contact surface of the bending mould and the plate has the corrugations with the same shape and size as those of the corrugated plate obtained in the step (1) through rolling forming, the radius of the bending mould is the same as the radius of a fillet of the corrugated pipe and is 15mm, and fig. 4 is a corrugated fillet bending forming principle diagram. At first with buckled plate front end clamp between bending die insert and press from both sides tight piece, the buckled plate rear end is pressed on the crease-resistance piece by the briquetting, prevents buckled plate rear end warpage and corrugate, and the bending die begins to rotate around the center, presss from both sides tight piece and bending die insert simultaneously and grasps the panel front end and around the bending die center rotation, and the buckled plate pastes gradually on the bending die, and bend angle is 90, obtains the 1 st radius and is 15 mm's bent angle (as shown in figure 5). And forming other 3 bent angles by the same method, wherein the distance between the centers of the bent angles is 100 mm.
3) Welding and forming:
and (3) flattening straight edge sections at two ends of the corrugated plate without the corrugation, which is obtained in the step (2), and finally welding the straight edge sections to obtain a semi-finished product of the corrugated pipe, as shown in fig. 6.
4) Roll forming of unformed sections:
and (4) putting the welded corrugated pipe semi-finished product in the step (3) into a rolling die to roll an unformed corrugated section (the length is 20 mm). During forming, the lower roller is taken down from the roller press, the semi-finished product of the corrugated pipe is sleeved on the lower roller, the inner surface of the unformed section of the semi-finished product of the corrugated pipe is attached to the lower roller, then the lower roller is installed on the roller press again, the upper roller presses downwards to be in contact with the outer surface of the unformed section, the upper roller and the lower roller rotate simultaneously, meanwhile, the upper roller presses downwards, the unformed part of the semi-finished product of the corrugated pipe is rolled to form the required corrugations, and the finished product of the corrugated pipe is obtained, as shown in fig. 7, 8 and 9.
Example 2
The 304 stainless steel material "runway" shaped corrugated pipe has the structure sketch as shown in fig. 10, 11 and 12.
The bellows dimensions were as follows: the total length L is 170mm, and the length L of straight line segments at two ends of the corrugated pipe1The corrugated pipe has the following characteristics that the corrugated pipe has the radius of 50mm, the radius of a fillet R of the corrugated pipe is 50mm, the length c of a runway-shaped straight edge of the cross section of the corrugated pipe is 100mm, and the radius R of a wave trough is 25mm, the wave height H is 35mm, the wave distance W is 60mm, and the corrugated pipe has the radius of a trough115mm, crest radius R215mm, 2 wave number N and 0.8mm wall thickness t.
1) Corrugation roll forming:
calculating the blank size of the corrugated pipe to be 320mm multiplied by 515mm (length multiplied by width), placing the plate in a rolling forming die, wherein the roller has the same wave shape size with the corrugated pipe, the contact surface of each roller disc in the upper roller and the lower roller and the plate is a semi-circular arc surface with the radius equal to 15mm according to the size of the corrugated pipe, and the distance between each roller disc is 30 mm. When the corrugated plate is formed, the edge of the plate with the length of 320mm is perpendicular to the axis of the roller, the plate is fed into the upper roller and the lower roller, the upper roller and the lower roller rotate at a constant speed, the upper roller moves downwards at the same time, the plate is gradually pressed into the lower roller, and the plate is formed into a required corrugated shape; fig. 2 is a schematic diagram illustrating the principle of corrugated plate roll forming. And rolling the corrugated plate 10mm away from the front end of the plate during rolling, and stopping rolling the corrugated plate 10mm away from the tail end of the plate to finally obtain the corrugated plate with two undeformed ends and corrugated middle, as shown in figure 3. And the head and tail sections are left to be not rolled, so that the subsequent welding is facilitated.
2) Winding and bending the corrugated plate:
and (3) placing the corrugated plate obtained in the step (1) into a bending mould for bending, wherein the contact surface of the bending mould and the plate has the corrugations with the same shape and size as those of the corrugated plate obtained in the step (1) through rolling forming, the radius of the bending mould is 50mm, which is the same as the radius of a fillet of the corrugated pipe, and fig. 4 is a corrugated fillet bending forming principle diagram. At first insert the buckled plate front end with the bending die between the tight piece of clamp, the buckled plate rear end is pressed on the crease-resistance piece by the briquetting, prevents buckled plate rear end warpage and corrugates, and the bending die begins to rotate around the center, and it is rotatory around the bending die center to press from both sides tight piece and bending die insert centre gripping panel front end simultaneously, and the buckled plate pastes gradually and leans on the bending die, and bend angle is 180, obtains the 1 st radius and is 50 mm's bent angle. The 2 nd bend is formed by the same method, and the distance between the centers of the two bends is 100 mm.
3) Welding and forming:
and (3) flattening straight edge sections at two ends of the corrugated plate with the bent angle, which are not corrugated, obtained in the step (2), and finally welding the straight edge sections to obtain a corrugated pipe semi-finished product.
4) Roll forming of unformed sections:
and (4) putting the welded corrugated pipe semi-finished product in the step (3) into a rolling die to roll an unformed corrugated section (the length is 20 mm). When forming, the lower roller is taken down from the roller press, the semi-finished product of the corrugated pipe is sleeved on the lower roller, the inner surface of the unformed section of the semi-finished product of the corrugated pipe is attached to the lower roller, then the lower roller is installed on the roller press again, the upper roller presses downwards to be in contact with the outer surface of the unformed section, the upper roller and the lower roller rotate simultaneously, the upper roller presses downwards simultaneously, the unformed part of the semi-finished product of the corrugated pipe is rolled to form the required corrugation, and the finished product of the corrugated pipe is obtained, as shown in fig. 10, 11 and 12.
Claims (7)
1. A new method for compositely forming a metal corrugated pipe with a special-shaped outline is characterized by comprising the following steps;
1) corrugation roll forming:
placing the plate in a rolling forming die, starting rolling at a position with a certain distance from the front end of the plate through an upper roller and a lower roller, and stopping rolling at a position with a certain distance from the tail end of the plate to finally obtain a corrugated plate with two undeformed ends and a corrugated middle;
2) winding and bending the corrugated plate:
placing the corrugated plate obtained in the step 1 in a bending mould for bending, wherein in the forming process, the clamping block and the bending mould insert block clamp the front end of the plate to rotate around the center of a bending mould, so that the corrugated plate is bent to form a required bending angle, the rear end of the corrugated plate is pressed on the anti-wrinkling block by a pressing block, and other bending angles are formed by adopting the same method, wherein the number of the bending angles is equal to the number of the fillets of the corrugated pipe;
3) welding and forming:
welding the head end and the tail end of the corrugated plate with the bent angle, which are obtained in the step (2), without corrugation, and if the two ends are not parallel and level, welding the corrugated plate in a clamp to obtain a semi-finished product of the corrugated pipe;
4) roll forming of unformed sections:
and (4) placing the corrugated pipe semi-finished product welded in the step (3) into a rolling die, and forming the unformed corrugated part of the corrugated pipe semi-finished product into corrugated pipes by a rolling process to obtain the corrugated pipe finished product.
2. A novel method for compositely forming a metal corrugated pipe with a special profile as claimed in claim 1, wherein the rollers in step 1 have the same wave shape size as the corrugated pipe, the length direction of the plate is perpendicular to the axes of the rollers during forming, the plate is fed into the upper and lower rollers, the upper and lower rollers rotate at a constant speed, the upper roller moves downwards to gradually press the plate into the lower roller, and the plate is formed into a desired corrugated shape.
3. A new method for composite forming of a metal bellows with a special profile according to claim 1, wherein in step 1, the upper and lower rollers have a plurality of roller discs with the same size, each roller disc is a semi-circular arc with a radius equal to the radius of the fillet of the corrugation trough, and the distance between adjacent roller discs is the diameter of the corrugation crest.
4. The new method for compositely forming a corrugated metal pipe with a special profile as claimed in claim 1, wherein in step 2, the contact surface of the bending die and the plate has corrugations with the same shape and size as those of the corrugated plate obtained by the roll forming in step 1, and the radius of the bending die is the same as the radius of the fillet of the corrugated pipe.
5. The new method for compositely forming a metal corrugated pipe with a special profile according to claim 1, wherein the number of the corners in the step 2 is consistent with the number of the round corners of the corrugated pipe, and the positions of the corners are determined according to the size of the corrugated pipe.
6. The new method for compositely forming a corrugated metal pipe with a special profile as claimed in claim 1, wherein the forming in step 4 is performed by first removing the lower roller from the rolling machine, sleeving the semi-finished corrugated pipe on the lower roller, pressing the inner surface of the unformed section of the semi-finished corrugated pipe against the lower roller, then reinstalling the lower roller on the rolling machine, pressing the upper roller to contact the outer surface of the unformed section, rotating the upper roller and the lower roller simultaneously, pressing the upper roller downwards, and rolling the unformed section of the semi-finished corrugated pipe into the desired corrugations to obtain the final corrugated pipe.
7. The novel method for compositely forming the metal corrugated pipe with the special-shaped profile according to claim 1, wherein in the step 1, the distance between the front end of the plate and the tail end of the plate is 10-20 mm.
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| CN112496076A (en) * | 2020-10-30 | 2021-03-16 | 太原理工大学 | Rolling method of inner corrugated metal composite pipe |
| CN112872160A (en) * | 2020-12-30 | 2021-06-01 | 南京晨光东螺波纹管有限公司 | Large-caliber rectangular corrugated pipe bulging die and using method thereof |
| CN113877983A (en) * | 2021-10-22 | 2022-01-04 | 中国原子能科学研究院 | Method for manufacturing corrugated pipe |
| CN114633078A (en) * | 2022-04-11 | 2022-06-17 | 楚天科技股份有限公司 | Method for manufacturing metal corrugated pipe |
| CN114734265A (en) * | 2022-06-13 | 2022-07-12 | 沈阳晨光弗泰波纹管有限公司 | Corrugated pipe manufacturing system and manufacturing method |
| EP4119830A1 (en) * | 2021-07-16 | 2023-01-18 | Kappler, Günter | Geometrically modified bellows for flexible elements |
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| CN112496076B (en) * | 2020-10-30 | 2022-08-12 | 太原理工大学 | Rolling method of inner corrugated metal composite pipe |
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| EP4119830A1 (en) * | 2021-07-16 | 2023-01-18 | Kappler, Günter | Geometrically modified bellows for flexible elements |
| CN113877983A (en) * | 2021-10-22 | 2022-01-04 | 中国原子能科学研究院 | Method for manufacturing corrugated pipe |
| CN114633078A (en) * | 2022-04-11 | 2022-06-17 | 楚天科技股份有限公司 | Method for manufacturing metal corrugated pipe |
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