CN112296154B

CN112296154B - Metal corrugated pipe forming machine and forming method using same

Info

Publication number: CN112296154B
Application number: CN202010942155.2A
Authority: CN
Inventors: 刘金荣
Original assignee: Tianjin Youxin Building Materials Manufacturing Co ltd
Current assignee: Tianjin Youxin Building Materials Manufacturing Co ltd
Priority date: 2020-09-09
Filing date: 2020-09-09
Publication date: 2023-08-08
Anticipated expiration: 2040-09-09
Also published as: CN112296154A

Abstract

The invention discloses a metal corrugated pipe forming machine and a forming method using the same, and relates to the technical field of steel pipe processing. The metal corrugated pipe forming machine comprises a machine table, a forming roller and a rotary driving assembly; the two axial sides of the forming roller are respectively provided with a steel pipe inserting opening and an extruding opening; a plurality of spinning dies are fixed in the forming roller, and each spinning die jointly encloses a cavity; the machine is provided with pipe end positioning components and extrusion cylinders on two axial sides of the forming roller respectively. A method for forming metal corrugated pipe includes inserting steel pipe, clamping steel pipe, spinning and other steps. The invention provides the metal corrugated pipe forming machine and the forming method using the forming machine, which have wide application range and extremely strong practicability, can realize one-step forming of the metal corrugated pipe, and can fully ensure the forming efficiency and the forming quality of the metal corrugated pipe.

Description

Metal corrugated pipe forming machine and forming method using same

Technical Field

The invention relates to the technical field of steel pipe machining, in particular to a metal corrugated pipe forming machine and a forming method using the same.

Background

The anchored metal corrugated pipe is a building component anchoring product developed along with the development of the fabricated building technology in recent two years, is mainly used in prefabricated members which are required to be anchored and connected by the fabricated building concrete components, and is a novel product developed specially for the fabricated building grouting anchoring technology.

The invention patent application with the prior application publication number of CN109772969A discloses a metal corrugated pipe forming device which comprises an upper pressing plate, a lower backing plate, an upper pressing head and a lower pressing head which are matched; a split female die, a female die fixing plate and a lower pressing plate are arranged between the upper pressing plate and the lower backing plate, the split female die is fixed on the lower backing plate through the female die fixing plate, and the upper end of the lower pressing plate is bent inwards and reversely buckled on the edge of the female die fixing plate; the middle of the upper pressing plate and the lower backing plate is respectively provided with a first central hole and a second central hole which are communicated, and the central axis of the first central hole, the central axis of the second central hole and the central axis of the cavity of the split female die are coincident.

When the metal corrugated pipe is molded by adopting the molding device provided by the technical scheme, the metal corrugated pipe is manufactured by utilizing a soft mold molding method, and particularly, a local sectional molding and sectional material supplementing technology is adopted, namely, one waveform structure is molded at first while axial material supplementing is carried out, then a second waveform structure is molded at the same time of axial material supplementing, and all waveform structures are molded in a similar way. However, since the metal bellows is processed by forming each wave structure one by one, the forming efficiency of the metal bellows is low, and the appearance of each wave structure is difficult to be kept consistent, so that the forming quality of the metal bellows is relatively insufficient.

Disclosure of Invention

The invention aims to provide a metal corrugated pipe forming machine, which is used for extruding a steel pipe through an extrusion oil cylinder and matching with each spinning valve die arranged in a forming roller to realize one-step forming of a metal corrugated pipe and improve the forming efficiency and the forming quality of the metal corrugated pipe.

The technical aim of the invention is realized by the following technical scheme:

a metal corrugated pipe forming machine comprises a machine table, a forming roller rotatably arranged on the machine table and a rotary driving assembly for driving the forming roller; the two axial sides of the forming roller are respectively provided with a steel pipe inserting opening and an extruding opening; a plurality of spinning valve dies which are uniformly distributed circumferentially are fixed in the forming roller, and each spinning valve die jointly encloses a cavity, and the cavities are opposite to the steel pipe inserting opening and the extrusion opening; the machine is characterized in that pipe end positioning assemblies and extrusion cylinders are respectively arranged on two axial sides of the forming roller, the pipe end positioning assemblies are abutted to the fixed ends of the steel pipes, and piston rods of the extrusion cylinders extend into the extrusion openings and extrude the steel pipes towards one sides where the pipe end positioning assemblies are located.

By adopting the technical scheme, the steel pipe is inserted into the forming roller from the steel pipe inserting port and extends into the cavity; the pipe end positioning assembly is abutted with one end of the steel pipe, which is exposed out of the forming roller, and the extrusion oil cylinder extrudes the steel pipe towards one side of the pipe end positioning assembly; meanwhile, the rotary driving assembly drives the forming roller to rotate, and the forming roller can realize spinning forming on the steel pipe through each spinning valve die. By the mode, on one hand, one-step forming of each waveform on the surface of the steel pipe is realized, and forming efficiency is improved; on the other hand, the consistency of each waveform on the surface of the steel pipe is ensured, and the forming quality of the metal corrugated pipe is improved.

The invention is further provided with: a plurality of clamping grooves which are uniformly distributed in circumference are formed on the inner wall of the forming roller; each spinning split die is inserted into each clamping groove in a one-to-one correspondence manner along the axial direction of the forming roller; the inner wall of the forming roller is provided with a positioning clamping shoulder in a protruding mode on one side, close to the extrusion opening, of the clamping groove, and a fixed end cover for abutting against the spinning valve die is detachably fixed on the steel pipe inserting opening of the forming roller.

The invention is further provided with: the pipe end positioning assembly comprises a support rod of which the horizontal fixing frame is arranged on the machine table; the support rod is hinged with a pipe end stop lever, and the lower end of the pipe end stop lever is fixed with a pipe end baffle plate for abutting against the fixed end of the steel pipe.

The invention is further provided with: the support rod is horizontally slipped and provided with a movable sleeve, the movable sleeve is detachably and fixedly arranged on the support rod, and the upper end of the pipe end stop rod is hinged to the movable sleeve.

The invention is further provided with: the end part of the piston rod of the extrusion oil cylinder is fixedly provided with an extrusion head, and one side of the extrusion head, which is away from the extrusion oil cylinder, is in a conical structure.

The invention is further provided with: the machine is provided with a steel pipe clamping assembly at one side of the steel pipe inserting opening; the steel pipe clamping assembly comprises a clamping support, a lower clamping block and an upper clamping block, wherein the clamping support is fixedly arranged on a machine table, the lower clamping block is fixedly arranged on the clamping support, the upper clamping block is arranged on the clamping support in a sliding mode up and down, a semicircular groove used for buckling a steel pipe is formed in one side, adjacent to the lower clamping block, of the upper clamping block, and a clamping hydraulic cylinder used for driving the upper clamping block to move up and down is further fixed on the clamping support.

The invention is further provided with: an upper mounting plate and a lower mounting plate which are arranged in parallel up and down are arranged on the clamping bracket; the upper clamping block and the lower clamping block are respectively detachably fixed on the upper mounting plate and the lower mounting plate; one side of the upper mounting plate, which is away from the upper clamping block, is fixedly connected with the clamping hydraulic cylinder; the lower mounting plate is arranged on the clamping support in an up-down adjustable mode.

The invention aims to provide a method for forming a metal corrugated pipe, which realizes one-step forming of the metal corrugated pipe by means of the metal corrugated pipe forming machine and improves the forming efficiency and the forming quality of the metal corrugated pipe.

a molding method of a metal corrugated pipe comprises the following steps:

s1, inserting a steel pipe into a cavity from a steel pipe inserting port, and enabling one end of the steel pipe positioned outside a forming roller to be abutted with a pipe end positioning assembly;

s2, starting an extrusion hydraulic cylinder, pushing the upper clamping block to move downwards by the extrusion hydraulic cylinder, and clamping the steel pipe together by matching with the lower clamping block;

s3, starting the extrusion oil cylinder and the rotary driving assembly, extruding the steel pipe towards the side where the pipe end positioning assembly is located by the extrusion oil cylinder, driving the forming roller to rotate by the rotary driving assembly, and realizing spinning forming on the steel pipe through each spinning valve die.

The invention is further provided with: after step S3 is completed, the method further comprises the following steps:

s4, loosening the steel pipe by the steel pipe clamping assembly, taking out the steel pipe, turning 180 degrees, and reinserting the steel pipe into the cavity;

s5, repeating the steps S2 and S3, and forming more corrugated pipe sections on the steel pipe.

In summary, the beneficial technical effects of the invention are as follows:

(1) The extrusion cylinder is utilized to extrude the steel pipe, the rotary driving assembly drives the forming roller to rotate, the forming roller realizes the spinning forming of the steel pipe through each spinning split die, the one-step forming of the metal corrugated pipe is realized, and the forming efficiency and the forming quality of the metal corrugated pipe are improved;

(2) Through can dismantle each spinning lamella mould fix realize removable in the shaping cylinder, cooperation adjustable steel pipe clamping assembly and pipe end locating component satisfy the processing operation of different length, different external diameter steel pipes, effectively enlarge the application scope of this corrugated metal pipe make-up machine, the practicality is strengthened greatly.

Drawings

FIG. 1 is a schematic overall structure of embodiment 1;

FIG. 2 is a top view of the overall structure of embodiment 1, primarily for embodying a rotary drive assembly;

FIG. 3 is a schematic view of the structure of embodiment 1 mainly used for embodying the forming roller and the spinning petal mold;

FIG. 4 is an enlarged view of a portion A of FIG. 1, primarily for use in embodying a steel tube gripping assembly;

fig. 5 is a flow chart of a method for forming a metal bellows in embodiment 2.

Reference numerals: 1. a machine table; 2. a roller mounting seat; 21. a mounting hole; 22. bearing bush; 3. a forming roller; 31. a connecting disc; 32. a clamping groove; 33. positioning a clamping shoulder; 4. fixing the end cover; 5. a rotary drive assembly; 51. a driven pulley; 52. a rotary drive motor; 53. a driving pulley; 54. a drive belt; 6. spinning the split mold; 7. a tube end positioning assembly; 71. a bracket rod; 72. a movable sleeve; 73. a pipe end stop lever; 74. a tube end baffle; 8. extruding an oil cylinder; 81. an extrusion head; 9. a steel tube clamping assembly; 91. a clamping bracket; 92. an upper mounting plate; 93. a lower mounting plate; 94. clamping a hydraulic cylinder; 95. adjusting a screw; 96. an upper clamping block; 97. and a lower clamping block.

Detailed Description

The present invention will be described more fully hereinafter with reference to the accompanying examples.

Example 1:

referring to fig. 1, a metal bellows forming machine comprises a machine table 1 and a roller mounting seat 2 fixed on the upper surface of the machine table 1, wherein a mounting hole 21 is horizontally penetrated in the roller mounting seat 2, a forming roller 3 is horizontally penetrated in the mounting hole 21, and the forming roller 3 is rotatably arranged at the mounting hole 21 through a bearing bush 22, so that flexible rotation is realized. The two axial sides of the forming roller 3 are respectively provided with a steel pipe inserting opening and an extruding opening; a coaxially arranged connecting disc 31 is fixed on one side of the forming roller 3 close to the extrusion opening, and the connecting disc 31 is abutted with one side adjacent to the roller mounting seat 2; meanwhile, a fixed end cover 4 is arranged on one side of the roller mounting seat 2, which is close to the steel pipe insertion opening, and the fixed end cover 4 and the forming roller 3 are coaxially arranged and fixedly connected with the roller mounting seat 2 through a flange. Therefore, the connecting disc 31 and the fixed end cover 4 can jointly realize axial positioning on the forming roller 3, and the stability of the installation of the forming roller 3 is ensured.

Referring to fig. 2, the machine 1 is further provided with a rotary driving assembly 5; the rotary driving assembly 5 comprises a driven belt pulley 51 coaxially fixed on one side of the connecting disc 31, which is far away from the forming roller 3, and a rotary driving motor 52 fixedly arranged on the upper surface of the machine table 1, wherein a driving belt pulley 53 is coaxially fixed on an output shaft of the rotary driving motor 52, and a transmission belt 54 is arranged between the driving belt pulley 53 and the driven belt pulley 51 in a tensioning manner. In operation, the rotary drive motor 52 may rotate the forming drum 3 via the driving pulley 53, the driving belt 54 and the driven pulley 51.

Referring to fig. 1 and 3, a plurality of spinning dies 6 which are uniformly distributed circumferentially are arranged in the forming roller 3, cavities for forming the surface waveforms of the metal corrugated pipe are formed between the spinning dies 6, and openings on two sides of the cavities are opposite to the steel pipe inserting opening and the extrusion opening respectively. Specifically, in order to install each spinning valve die 6, the inner wall of the forming roller 3 is provided with a plurality of clamping grooves 32 which are uniformly distributed in circumference, and the clamping grooves 32 are arranged in one-to-one correspondence with the spinning valve dies 6; when the spinning dies 6 are mounted, they are inserted into the respective clamping grooves 32 in the axial direction of the forming drum 3. Meanwhile, a positioning clamping shoulder 33 is formed on the inner wall of the forming roller 3 at one side of the clamping groove 32 close to the extrusion port in a protruding mode; after the spinning valve die 6 is inserted into the clamping groove 32, two sides of the spinning valve die 6 in the length direction are respectively abutted against the positioning clamping shoulder 33 and the fixed end cover 4, so that axial positioning is realized.

Referring to fig. 1, a machine 1 is provided with a pipe end positioning assembly 7 and an extrusion cylinder 8 on the side where a steel pipe insertion port and an extrusion port are located. In operation, the pipe end positioning assembly 7 is abutted against one end of the steel pipe exposed out of the forming roller 3, and a piston rod of the extrusion oil cylinder 8 extends into the forming roller 3 from the extrusion opening and extrudes the steel pipe towards one side of the pipe end positioning assembly 7; wherein, the end of the steel pipe, which is abutted against the pipe end positioning assembly 7, is fixed in the axial direction, so as to form a fixed end of the steel pipe. Specifically, an end of a piston rod of the extrusion cylinder 8 is coaxially fixed with an extrusion head 81, and one end of the extrusion head 81, which is away from the extrusion cylinder 8, can be provided with a conical structure. In operation, a piston rod of the extrusion oil cylinder 8 pushes the extrusion head 81 to abut against an adjacent port of the steel pipe; the extrusion head 81 of the conical structure can realize centering effect on the steel pipe and can be suitable for the steel pipes with different inner diameters.

The pipe end positioning assembly 7 comprises a support rod 71 which is horizontally fixed on the top of the roller mounting seat 2, a movable sleeve 72 is arranged on the support rod 71 in a sliding sleeve mode, the movable sleeve 72 is detachably fixed on the support rod 71 through bolts, and a pipe end stop rod 73 is further hinged to the lower side of the movable sleeve 72. A pipe end baffle 74 is fixed at the lower end of the pipe end stop lever 73; in operation, the pipe end stop rod 73 is abutted against the fixed end of the steel pipe through the pipe end baffle 74, so that the axis positioning of the steel pipe is realized. When the length of the metal corrugated pipe to be processed is changed, the movable sleeve 72 is moved, so that the processing operation of the metal corrugated pipes with different lengths can be satisfied.

Referring to fig. 4, the roller mounting seat 2 is further provided with a steel pipe clamping assembly 9 at one side of the steel pipe inserting port; the steel pipe clamping assembly 9 comprises a clamping bracket 91 fixedly arranged on one side of the fixed end cover 4, which is away from the roller mounting seat 2, wherein the clamping bracket 91 can be arranged into a square frame structure, and an upper mounting plate 92 and a lower mounting plate 93 which are arranged in parallel are embedded in the clamping bracket. Wherein the upper mounting plate 92 is movably arranged up and down inside the clamping bracket 91; the top of the clamping bracket 91 is vertically fixed with a clamping hydraulic cylinder 94, and the end part of a piston rod of the clamping hydraulic cylinder 94 is fixedly connected with the upper side of the upper mounting plate 92. The lower mounting plate 93 is arranged on the clamping bracket 91 in an up-down adjustable way; specifically, an adjusting screw 95 is threaded through vertical threads on the lower side of the clamping bracket 91, and the upper end of the adjusting screw 95 is rotationally connected with the lower side of the lower mounting plate 93; when the adjusting screw 95 is manually rotated, the adjusting screw 95 can drive the lower mounting plate 93 to move up and down; in normal operation, the lower mounting plate 93 is stationary.

An upper clamping block 96 and a lower clamping block 97 are respectively fixed on the adjacent sides of the upper mounting plate 92 and the lower mounting plate 93, and semicircular grooves are formed on the adjacent sides of the upper clamping block 96 and the lower clamping block 97; in operation, when the clamping hydraulic cylinder 94 pushes the upper clamping block 96 to move downwards and abut against the lower clamping block 97, the two semicircular grooves abut against the upper side and the lower side of the steel pipe respectively, so that the steel pipe is buckled together, and the stability of the steel pipe is maintained.

The working principle of the embodiment is as follows: in operation, a worker inserts a steel pipe to be processed into the cavity in the forming drum 3 from the steel pipe insertion port, so that one end of the steel pipe extending into the forming drum 3 abuts against the extrusion head 81. Subsequently, the pipe end stopper 73 is swung downward, and the pipe end baffle 74 abuts against one end of the steel pipe exposed forming drum 3. Next, the clamping hydraulic cylinder 94 is activated, and the clamping hydraulic cylinder 94 pushes the upper clamping block 96 to move downwards, and the upper clamping block 96 and the lower clamping block 97 clamp the steel pipe together. Finally, the extrusion cylinder 8 and the rotary driving motor 52 are started; while the extrusion cylinder 8 extrudes the steel pipe through the extrusion head 81, the rotary driving assembly 5 drives the forming roller 3 to rotate in the roller mounting seat 2, and the forming roller 3 further realizes spinning forming on the pipe section of the steel pipe positioned in the cavity through each spinning valve die 6. By the mode, one-step forming of the metal corrugated pipe is realized, and the forming efficiency and the forming quality of the metal corrugated pipe are improved.

Example 2:

referring to fig. 5, a method for forming a metal bellows includes the following steps:

s1, inserting the steel pipe into the die cavity from the steel pipe inserting port, and enabling one end of the steel pipe positioned outside the forming roller 3 to be abutted against the pipe end positioning assembly 7. Specifically, after the steel pipe is inserted into the cavity and abuts against the extrusion head 81, the pipe end bar 73 is swung downward so that one end of the steel pipe exposed out of the forming roller 3 abuts against the pipe end baffle 74; the tube end baffles 74 provide axial positioning of the tube.

S2, starting an extrusion hydraulic cylinder, pushing the upper clamping block 96 to move downwards by the extrusion hydraulic cylinder, and clamping the steel pipe together by matching with the lower clamping block 97.

S3, starting the extrusion oil cylinder 8 and the rotary driving assembly 5, and driving the forming roller 3 to rotate by the rotary driving assembly 5 while extruding the steel pipe towards the side where the pipe end positioning assembly 7 is located by the extrusion oil cylinder 8, and realizing spinning forming on the steel pipe through each spinning valve die 6. In the process, the upper clamping block 96 is matched with the lower clamping block 97 to always clamp the steel pipe, so that the steel pipe is prevented from synchronously rotating along with each spinning valve die 6, and the forming effect of the waveform on the surface of the metal corrugated pipe is ensured. In this way, the steel pipe is spin-formed by using each spin-valve die 6, so that one-step forming of the metal corrugated pipe is realized, and the forming efficiency and the forming quality of the metal corrugated pipe can be improved.

If the length of the metal bellows to be formed is short, after the step S3 is completed, the steel pipe can be drawn out from the forming roller 3, and then the redundant straight pipe section on the steel pipe is cut off, so that the production requirement can be met. However, when the length of the metal bellows to be formed is long, the following operations may be performed after the completion of the above step S3 in order to meet the production requirements:

s4, the steel pipe clamping assembly 9 loosens the steel pipe, and the steel pipe is taken out and reinserted into the die cavity after 180 degrees of rotation.

After the wave-shaped forming of the surface of one side pipe section of the steel pipe is finished, the steel pipe is pulled out of the forming roller 3, turned 180 degrees and reinserted into the die cavity, and the spinning forming process is repeated once. When the length of the steel pipe is just equal to the length of the double die cavity, a complete metal corrugated pipe with relatively long length can be just formed by the method. Meanwhile, in actual production, the length and the diameter of the cavity can be changed by changing the spinning valve die 6, so that the method is suitable for production operation of metal corrugated pipes with more specifications.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. All equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.

Claims

1. A metal bellows make-up machine, its characterized in that: comprises a machine table (1), a forming roller (3) rotatably arranged on the machine table (1) and a rotary driving assembly (5) for driving the forming roller (3); the two axial sides of the forming roller (3) are respectively provided with a steel pipe inserting opening and an extruding opening; a plurality of spinning dies (6) which are uniformly distributed circumferentially are fixed in the forming roller (3), and each spinning die (6) jointly encloses a cavity, and the cavities are opposite to the steel pipe inserting opening and the extrusion opening; the machine table (1) is provided with a pipe end positioning assembly (7) and an extrusion oil cylinder (8) respectively at two axial sides of the forming roller (3), the pipe end positioning assembly (7) is abutted to the fixed end of the steel pipe, and a piston rod of the extrusion oil cylinder (8) extends into the extrusion port and extrudes the steel pipe towards one side where the pipe end positioning assembly (7) is located;

a plurality of clamping grooves (32) which are uniformly distributed in circumference are formed on the inner wall of the forming roller (3); each spinning valve die (6) is inserted into each clamping groove (32) in a one-to-one correspondence manner along the axial direction of the forming roller (3); the inner wall of the forming roller (3) is provided with a positioning clamping shoulder (33) in a protruding mode on one side, close to the extrusion opening, of the clamping groove (32), and a fixed end cover (4) used for abutting against the spinning valve die (6) is detachably fixed on the steel pipe inserting opening of the forming roller (3).

2. A metal bellows forming machine according to claim 1, wherein: the pipe end positioning assembly (7) comprises a support rod (71) which is horizontally fixed on the machine table (1); the support rod (71) is hinged with a pipe end stop lever (73), and the lower end of the pipe end stop lever (73) is fixed with a pipe end baffle plate (74) for abutting against the fixed end of the steel pipe.

3. A metal bellows forming machine according to claim 2, wherein: the movable sleeve (72) is horizontally arranged on the support rod (71) in a sliding mode, the movable sleeve (72) is detachably and fixedly arranged on the support rod (71), and the upper end of the pipe end stop lever (73) is hinged to the movable sleeve (72).

4. A metal bellows forming machine according to claim 1, wherein: an extrusion head (81) is fixed at the end part of a piston rod of the extrusion oil cylinder (8), and one side of the extrusion head (81) deviating from the extrusion oil cylinder (8) is in a conical structure.

5. A metal bellows forming machine according to claim 1, wherein: the machine table (1) is provided with a steel pipe clamping assembly (9) at one side where the steel pipe inserting port is positioned; the steel pipe clamping assembly (9) comprises a clamping support (91) fixedly arranged on the machine table (1), a lower clamping block (97) fixedly arranged on the clamping support (91) and an upper clamping block (96) arranged on the clamping support (91) in a vertical sliding mode, semicircular grooves used for clamping the steel pipes are formed in adjacent sides of the upper clamping block (96) and the lower clamping block (97), and a clamping hydraulic cylinder (94) used for driving the upper clamping block (96) to move up and down is further fixed on the clamping support (91).

6. A metal bellows forming machine according to claim 5, wherein: an upper mounting plate (92) and a lower mounting plate (93) which are arranged in parallel up and down are arranged on the clamping bracket (91); the upper clamping block (96) and the lower clamping block (97) are respectively detachably fixed on the upper mounting plate (92) and the lower mounting plate (93); one side of the upper mounting plate (92) deviating from the upper clamping block (96) is fixedly connected with the clamping hydraulic cylinder (94); the lower mounting plate (93) is arranged on the clamping bracket (91) in an up-down adjustable way.

7. A metal bellows molding method using the metal bellows molding machine according to any one of claims 5 to 6, characterized in that: the method comprises the following steps:

s1, inserting a steel pipe into a cavity from a steel pipe inserting port, and enabling one end of the steel pipe positioned outside a forming roller (3) to be abutted against a pipe end positioning assembly (7);

s2, starting a clamping hydraulic cylinder (94), pushing an upper clamping block (96) to move downwards by the clamping hydraulic cylinder (94), and clamping a steel pipe together by matching with a lower clamping block (97);

s3, starting the extrusion oil cylinder (8) and the rotary driving assembly (5), and when the extrusion oil cylinder (8) extrudes the steel pipe towards one side of the pipe end positioning assembly (7), the rotary driving assembly (5) drives the forming roller (3) to rotate and spin forming is achieved on the steel pipe through each spinning split die (6).

8. The method for forming a metal bellows according to claim 7, wherein: after step S3 is completed, the method further comprises the following steps:

s4, loosening the steel pipe by the steel pipe clamping assembly (9), taking out the steel pipe, turning the steel pipe by 180 degrees, and reinserting the steel pipe into the cavity;