Forming device and forming method for refrigerator side wall condenser pipe

Abstract

The invention provides a forming device and method for a refrigerator side wall condenser pipe. The forming device comprises a fixing plate. The fixed plate is fixed on the rack, two parallel X-axis guide rails are arranged on the fixed plate, a feeding device is arranged on the X-axis guide rails, and a bending mechanism and two groups of cutting mechanisms are arranged on the fixed plate between the two X-axis guide rails; the two sets of cutting mechanisms abut against the two ends of one X-axis guide rail correspondingly. Each cutting mechanism comprises a cutting device and a clamping device. The feeding device is driven by the two vertical lead screw mechanisms to move on the fixing plate along the shape of the condenser pipe, the shape of the condenser pipe is formed through the pipe bending dies arranged at all the bent positions of the condenser pipe, full-automatic continuous machining of the condenser pipe is achieved, the condenser pipe is shaped after being bent through the pushing device, and the machining efficiency of the condenser pipe is improved. The condenser pipe can be formed in one step, and the machining efficiency is improved.

Description

Technical Field

[0001] The invention relates to a forming device and a forming method for a refrigerator side condenser tube. Background Art

[0002] The condenser is a key component of refrigerator refrigeration. As the main part of the condenser, the condenser tube is usually made of metal materials with high thermal conductivity and good ductility. According to different product requirements, the metal tube is bent into different shapes, and has certain requirements for angles, sizes, etc. Traditional refrigerator condenser tubes are usually bent manually due to their large overall size and complex structure, which usually requires high experience and physical strength of workers, and the process is complicated. Therefore, a set of automatic forming devices is needed to replace the manual bending process. For example, a condenser tube automatic clamping and feeding device disclosed in CN116833323A realizes the automatic clamping and feeding function of the condenser tube through a feeding module and a bending module, reduces the working cost, improves the feeding efficiency of the condenser tube, and overcomes the problem that the accumulation of condenser tubes cannot be fed one by one, but it can only feed the condenser tube materials that have been cut, and the feeding speed cannot be adjusted. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a forming device and a forming method for a refrigerator side condenser tube.

[0004] The present invention is achieved through the following technical solutions.

[0005] The present invention provides a forming device and forming method for a refrigerator side condenser tube, comprising a fixing plate; the fixing plate is fixed on a frame, two mutually parallel X-axis guide rails are arranged on the fixing plate, a feeding device is installed on the X-axis guide rails, a bending mechanism and two groups of cutting mechanisms are installed on the fixing plate between the two X-axis guide rails; the two groups of cutting mechanisms are respectively close to the two ends of one of the X-axis guide rails, and the cutting mechanism comprises a cutting device and a clamping device;

[0006] The bending mechanism includes several rotatable bending molds and fixed bending molds. The rotatable bending mold shapes the heat exchange part of the condenser, and the fixed bending mold shapes the transition connection part of the condenser. The fixed bending mold is installed in the middle of the fixed plate and is adjacent to another X-axis guide rail, and the rotatable bending mold is distributed at both ends of several fixed bending molds.

[0007] There are six fixed pipe bending dies, wherein the centers of the connection lines between the four fixed pipe bending dies and the two fixed pipe bending dies are on the same straight line and are respectively parallel to the X-axis guide rails, and the two fixed pipe bending dies are installed on the first pushing device.

[0008] The first pushing device includes a mold connecting plate A, two fixed pipe bending molds are respectively installed at both ends of the mold connecting plate A, the mold connecting plate A is installed on the guide plate, the guide plate is installed on the guide rail, the guide rail is installed on the base plate, the base plate is hoisted at the bottom of the fixed plate, a servo motor is installed at the end of the base plate and connected to the guide plate, the push rod direction of the servo motor is perpendicular to the mold connecting plate A, a square guide hole is processed on the fixed plate, and the two fixed pipe bending molds are respectively in contact with the two side walls of the square guide hole.

[0009] Two of the several rotatable tube bending molds are independently arranged at both ends of the fixed plate, and the connecting line between the two independent rotatable tube bending molds and their adjacent cutting devices is perpendicular to the X-axis guide rail. The remaining rotatable tube bending molds are respectively arranged in two rows on both sides of the fixed tube bending mold. The two rows of rotatable tube bending molds are both arranged at the bending part of the condenser tube and the connecting lines are respectively perpendicular to the X-axis guide rails.

[0010] The rotatable tube bending dies located on one side of the cutting assembly in the two rows of rotatable tube bending dies are fixed on the fixed plate, and the remaining rotatable tube bending dies extend into the bottom of the fixed plate and are installed on the second pushing device. The pushing device includes a die connecting plate B. The die connecting plate B is processed with through holes with the same spacing as each row of rotatable tube bending dies to install the rotatable tube bending dies. The die connecting plate B is fixed on the die moving support plate, and a meshing gear is installed on the die moving support plate to cooperate with the circular arc gear track fixed on the bottom of the fixed plate; the circular arc gear track is arc-shaped, and the tooth row is arranged on the outer wall of the circular arc gear track. The bottom of the two side surfaces of the circular arc gear track is horizontally extended with side plates to cooperate with the rollers fixed on the die moving support plate.

[0011] The row of the two rows of rotatable bending dies adjacent to the cutting assembly is installed on a movable plate, the bottom of the movable plate is connected to the push rod of the stretching cylinder fixed to the bottom of the fixed plate, and the pushing direction of the stretching cylinder is parallel to the X-axis guide rail.

[0012] The fixing plate is also processed with an arc-shaped through hole parallel to the circular arc rack.

[0013] The feeding mechanism includes a Y-axis gantry on two X-axis guide rails, one end of the Y-axis gantry is on a lead screw mechanism assembled on a fixed plate and parallel to the X-axis guide rail, the top of the fixed plate is provided with a Y-axis guide rail perpendicular to the X-axis guide rail, the Y-axis sliding plate is installed on the Y-axis guide rail, one end of the X-axis sliding plate is driven by the lead screw mechanism installed on the Y-axis gantry, one end of the X-axis sliding plate extends out of the side end of the tripod and is vertically provided with a reversing mounting plate, and a guide wheel is installed on the top of the reversing mounting plate. Two rows of pinching and feeding roller groups are evenly installed on the end surface of the reversing mounting plate facing away from the Y-axis gantry, and the rotating shafts of the two rows of pinching and feeding roller groups pass through the reversing mounting plate and cooperate with the roller servo motor installed on the other end surface of the reversing mounting plate through gears. The bottom of the end surface of the reversing mounting plate on which the pinching and feeding roller groups are installed is fixedly connected to a bottom plate perpendicular to the reversing mounting plate, and a reversing servo motor and 11 are respectively installed on the upper and lower end surfaces of the bottom plate, and a reversing gear is also installed on the bottom plate to mesh with the reversing servo motor;

[0014] The rotating shaft of the reversing gear is hollow and passes through the bottom plate to be connected with the top of 11. The 11 is semicircular, and its inner ring is processed with a ring groove and a pulley is installed.

[0015] A method for forming a refrigerator side condenser tube, comprising the following steps:

[0016] S1, move the feeding mechanism to any clamping device, and make the direction of 11 face the clamping device;

[0017] S2, passing the metal tube to be processed through the feeding mechanism and fixing its end in the clamping device;

[0018] S3, the lead screw mechanism drives the X-axis sliding plate and the Y-axis gantry to move according to the condenser tube structure;

[0019] S4, when moving to the position of the rotatable bending mold or the fixed bending mold of the condenser tube, the reversing servo motor controls the rotation of the reversing device through the gear transmission, and then rotates half a circle around the rotatable bending mold or the fixed bending mold, so that the metal tube is bent around the rotatable bending mold or the fixed bending mold;

[0020] S5, finally transporting the metal tube to another clamping device on the fixed plate to clamp the metal tube, and driving the cutting device to cut off the condenser tube;

[0021] S6, driving the first pushing device and the second pushing device to shape the metal tube and then remove it;

[0022] S7, driving the feeding mechanism back to step S1 and clamping the end of the metal pipe, and then repeating steps S3 to S6 for continuous processing.

[0023] The beneficial effects of the present invention are: two vertical screw mechanisms are used to drive the feeding device to move along the shape of the condenser on the fixed plate, and the shape of the condenser is formed by a bending mold arranged at each bend of the condenser, thereby realizing fully automatic continuous processing of the condenser, and the condenser is shaped after bending by a pushing device, so that the condenser can be formed in one step, thereby improving processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the shaping mechanism of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the concave push mechanism of the present invention;

[0027] Figure 4 It is a schematic diagram for comparing the structures of the condenser tube of the present invention before and after being pushed;

[0028] Figure 5 It is a schematic diagram of the position structure of the pipe bending die of the present invention;

[0029] In the figure: 1-frame, 2-fixed plate, 3-X-axis guide rail, 4-slider, 5-X-axis motion pad, 6-servo motor, 7-coupling, 8-screw, 9-rotatable pipe bending mold, 10-fixed pipe bending mold, 11-guide device, 12-grip roller group, 13-X-axis sliding plate, 14-Y-axis gantry, 15-Y-axis guide rail, 16-reversing mounting plate, 17-mold base, 18-guide wheel, 19-rolling bearing, 20-cutting device, 21-clamping device , 22-reversing gear, 23-reversing servo motor, 24-roller servo motor, 25-movable plate, 26-mold outer ring, 27-stretching cylinder, 28-servo motor, 29-mold motion bearing plate, 30-arc gear rail, 31-meshing gear, 32-mold connecting plate B, 33-mold connecting plate A, 34-guide plate, 35-guide rail, 36-connecting block, 37-guide wheel, 38-bottom plate, 39-servo motor, 40-arc guide hole, 41-square guide hole. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0031] like Figure 1As shown, a forming device and forming method of a refrigerator side condenser tube include a fixing plate 2; the fixing plate 2 is fixed on a frame 1, two mutually parallel X-axis guide rails 3 are arranged on the fixing plate 2, a feeding device is installed on the X-axis guide rails 3, and a bending mechanism and two sets of cutting mechanisms are installed on the fixing plate 2 between the two X-axis guide rails 3; the two sets of cutting mechanisms are respectively close to the two ends of one of the X-axis guide rails 3, and the cutting mechanism includes a cutting device 20 and a clamping device 21;

[0032] The bending mechanism includes a plurality of rotatable bending dies 9 and a fixed bending dies 10. The rotatable bending dies 9 are used to shape the heat exchange portion of the condenser tube, and the fixed bending dies 10 are used to shape the transition connection portion of the condenser tube. The fixed bending dies 10 are installed in the middle of the fixed plate 2 and are adjacent to another X-axis guide rail 3. The rotatable bending dies 9 are distributed at both ends of the plurality of fixed bending dies 10.

[0033] There are six fixed tube bending dies 10, wherein the centers of the connecting lines between the four fixed tube bending dies 10 and the two fixed tube bending dies 10 are on the same straight line and are respectively parallel to the X-axis guide rail 3, and the two fixed tube bending dies 10 are installed on the first pushing device.

[0034] The first pushing device includes a mold connecting plate A33, two fixed bending molds 10 are respectively installed at both ends of the mold connecting plate A33, the mold connecting plate A33 is installed on the guide plate 34, the guide plate 34 is installed on the guide rail 35, the guide rail 35 is installed on the base plate 38, the base plate 38 is hoisted at the bottom of the fixed plate 2, a servo motor 39 is installed at the end of the base plate 38 and connected to the guide plate 34, the push rod direction of the servo motor 39 is perpendicular to the mold connecting plate A33, a square guide hole 41 is processed on the fixed plate 2, and the two fixed bending molds 10 are respectively in contact with the two side walls of the square guide hole 41.

[0035] Two of the several rotatable tube bending molds 9 are independently arranged at both ends of the fixed plate 2, and the connecting line between the two independent rotatable tube bending molds 9 and their adjacent cutting devices 20 is perpendicular to the X-axis guide rail 3. The remaining rotatable tube bending molds 9 are respectively arranged in two rows on both sides of the fixed tube bending mold 10, and the two rows of rotatable tube bending molds 9 are both arranged at the bending part of the condenser tube and the connecting lines are respectively perpendicular to the X-axis guide rail 3.

[0036] The rotatable tube bending dies 9 located on one side of the cutting assembly in the two rows of rotatable tube bending dies 9 are fixed on the fixed plate 2, and the remaining rotatable tube bending dies 9 extend into the bottom of the fixed plate 2 and are installed on the second pushing device. The pushing device includes a die connecting plate B32. The die connecting plate B32 is processed with through holes with the same spacing as each row of rotatable tube bending dies 9 to install the rotatable tube bending dies 9. The die connecting plate B32 is fixed on the die moving support plate 29. The die moving support plate 29 is provided with a meshing gear 31 to cooperate with the circular arc rack 30 fixed on the bottom of the fixed plate 2; the circular arc rack 30 is arc-shaped, and the tooth row is arranged on the outer wall of the circular arc rack 30. The bottom of the two sides of the circular arc rack 30 has side plates extending horizontally to cooperate with the rollers fixed on the die moving support plate 29.

[0037] The row of the two rows of rotatable bending dies 9 adjacent to the cutting assembly is installed on a movable plate 25, and the bottom of the movable plate 25 is connected to the push rod of a stretching cylinder 27 fixed to the bottom of the fixed plate 2, and the pushing direction of the stretching cylinder 27 is parallel to the X-axis guide rail 3.

[0038] The fixing plate 2 is also processed with an arc-shaped through hole parallel to the circular arc rack 30 .

[0039] The feeding mechanism includes a Y-axis gantry 14 on two X-axis guide rails 3, one end of the Y-axis gantry 14 is mounted on a lead screw mechanism mounted on a fixed plate 2 and parallel to the X-axis guide rail 3, a Y-axis guide rail 15 perpendicular to the X-axis guide rail 3 is mounted on the top of the fixed plate 2, an X-axis sliding plate 13 is mounted on the Y-axis guide rail 15, the X-axis sliding plate 13 is driven by a lead screw mechanism mounted on the Y-axis gantry 14, one end of the X-axis sliding plate 13 extends out of the side end of the tripod and is vertically mounted with a reversing mounting plate 16, and a guide wheel 18 is mounted on the top of the reversing mounting plate 16 Two rows of pinch roller groups 12 are evenly installed on the end surface of the reversing mounting plate 16 facing away from the Y-axis gantry 14. The rotating shafts of the two rows of pinch roller groups 12 pass through the reversing mounting plate 16 and cooperate with the roller servo motor 24 installed on the other end surface of the reversing mounting plate 16 through gears. The bottom of the end surface of the reversing mounting plate 16 on which the pinch roller group 12 is installed is fixedly connected with a bottom plate perpendicular to the reversing mounting plate 16. Reversing servo motors 23 and 11 are respectively installed on the upper and lower end surfaces of the bottom plate. A reversing gear 22 is also installed on the bottom plate to mesh with the reversing servo motor 23;

[0040] The rotating shaft of the reversing gear 22 is hollow and passes through the bottom plate to be connected to the top of 11. The 11 is semicircular, and its inner ring is processed with a ring groove and a pulley is installed.

[0041] A method for forming a refrigerator side condenser tube, comprising the following steps:

[0042] S1, move the feeding mechanism to any clamping device 21, and make the direction of 11 face the clamping device 21;

[0043] S2. The metal tube to be processed is passed through the feeding mechanism and its end is fixed in the clamping device 21; the metal tube passes through the guide wheel 18 and the clamping roller 12, and is sent to the lower guide device 11 under the action of the roller servo motor 24. The guide device 11 is provided with rollers arranged in a semicircle. After passing through the guide device 11, the direction of the metal tube changes from vertical to horizontal. The metal tube extends in the horizontal direction, and after extending a certain distance, the clamping device 21 clamps the metal tube.

[0044] S3, the screw mechanism drives the X-axis sliding plate 13 and the Y-axis gantry 14 to move according to the condenser tube structure;

[0045] S4, when the condenser tube moves to the position of the rotatable tube bending mold 9 or the fixed tube bending mold 10, the reversing servo motor 23 controls the rotation of the reversing device through the gear transmission, and then rotates half a circle around the rotatable tube bending mold 9 or the fixed tube bending mold 10, so that the metal tube is bent around the rotatable tube bending mold 9 or the fixed tube bending mold 10;

[0046] S5, finally transporting the metal tube to another clamping device 21 on the fixed plate 2 to clamp the metal tube, and driving the cutting device 20 to cut off the condenser tube;

[0047] S6, driving the first pushing device and the second pushing device to shape the metal tube and then remove it;

[0048] The working process of the second pushing device is as follows: the servo motor 28 rotates to drive the meshing gear 31 to rotate, and through the meshing with the arc guide rail 30, the mold moving support plate 29 moves along the arc guide rail 30 with the assistance of the guide wheel 37, and the mold moving support plate 29 is connected to the mold connecting plate B32, thereby driving the mold connecting plate B32 to move, and the rotatable bending pipe mold 9 installed on the mold connecting plate B32 moves along the arc guide hole. When the mold reaches the other side of the installation groove, the servo motor 28 stops. While the second pushing device is working, the first pushing device also starts to work, the servo motor 39 rotates to drive the lead screw to rotate, and the guide plate 34 drives the mold connecting plate A33 to move along the Y-axis direction. When it moves to the specified position, the servo motor stops 28.

[0049] S7, driving the feeding mechanism back to step S1 and clamping the end of the metal pipe, and then repeating steps S3 to S6 for continuous processing.

Claims

1. A forming device for a refrigerator side condenser tube, comprising a fixing plate (2), characterized in that: The fixed plate (2) is fixed on the frame (1); two mutually parallel X-axis guide rails (3) are arranged on the fixed plate (2); a feeding device is installed on the X-axis guide rails (3); a bending mechanism and two sets of cutting mechanisms are installed on the fixed plate (2) between the two X-axis guide rails (3); the two sets of cutting mechanisms are respectively close to the two ends of one of the X-axis guide rails (3); the cutting mechanism comprises a cutting device (20) and a clamping device (21); The bending mechanism comprises a plurality of rotatable bending dies (9) and a fixed bending dies (10), wherein the rotatable bending dies (9) are used to shape the heat exchange portion of the condenser tube, and the fixed bending dies (10) are used to shape the transition connection portion of the condenser tube; the fixed bending dies (10) are installed in the middle of the fixed plate (2) and are adjacent to another X-axis guide rail (3), and the rotatable bending dies (9) are distributed at both ends of the plurality of fixed bending dies (10).

2. A forming device for a refrigerator side condenser tube as claimed in claim 1, characterized in that: There are six fixed pipe bending dies (10), wherein the centers of the lines between the four fixed pipe bending dies (10) and the two fixed pipe bending dies (10) are on the same straight line and are respectively parallel to the X-axis guide rail (3), and the two fixed pipe bending dies (10) are installed on the first pushing device.

3. A forming device for a refrigerator side condenser tube as claimed in claim 2, characterized in that: The first pushing device comprises a mold connecting plate A (33), two fixed pipe bending molds (10) are respectively mounted at two ends of the mold connecting plate A (33), the mold connecting plate A (33) is mounted on a guide plate (34), the guide plate (34) is mounted on a guide rail (35), the guide rail (35) is mounted on a base plate (38), the base plate (38) is suspended at the bottom of the fixed plate (2), a servo motor (39) is mounted at the end of the base plate (38) and connected to the guide plate (34), the push rod direction of the servo motor (39) is perpendicular to the mold connecting plate A (33), a square guide hole (41) is processed on the fixed plate (2), and the two fixed pipe bending molds (10) are respectively in contact with the two side walls of the square guide hole (41).

4. A forming device for a refrigerator side condenser tube as claimed in claim 1, characterized in that: Two of the plurality of rotatable tube bending molds (9) are independently arranged at both ends of the fixed plate (2), and the connection line between the two independent rotatable tube bending molds (9) and their adjacent cutting devices (20) is perpendicular to the X-axis guide rail (3). The remaining rotatable tube bending molds (9) are respectively arranged in two rows on both sides of the fixed tube bending mold (10), and the two rows of rotatable tube bending molds (9) are both arranged at the bending part of the condenser tube and the connection line is respectively perpendicular to the X-axis guide rail (3).

5. A forming device for a refrigerator side condenser tube as claimed in claim 4, characterized in that: The rotatable tube bending dies (9) located on one side of the cutting assembly in the two rows of rotatable tube bending dies (9) are fixed on the fixed plate (2), and the remaining rotatable tube bending dies (9) extend into the bottom of the fixed plate (2) and are installed on the second pushing device, the pushing device comprising a die connecting plate B (32), the die connecting plate B (32) being processed with through holes having the same spacing as that of each row of rotatable tube bending dies (9) for installing the rotatable tube bending dies (9), the die connecting plate B (32) being fixed on the die moving support plate (29), the die moving support plate (29) being provided with a meshing gear (31) for cooperating with a circular arc gear rail (30) fixed on the bottom of the fixed plate (2); the circular arc gear rail (30) is arc-shaped, the tooth row is arranged on the outer wall of the circular arc gear rail (30), and the bottom of the two side surfaces of the circular arc gear rail (30) are horizontally extended with side plates for cooperating with rollers fixed on the die moving support plate (29).

6. A forming device for a refrigerator side condenser tube as claimed in claim 5, characterized in that: One of the two rows of rotatable pipe bending dies (9) adjacent to the cutting assembly is mounted on a movable plate (25), the bottom of the movable plate (25) is connected to a push rod of a stretching cylinder (27) fixed to the bottom of a fixed plate (2), and the pushing direction of the stretching cylinder (27) is parallel to the X-axis guide rail (3).

7. A forming device for a refrigerator side condenser tube as claimed in claim 5, characterized in that: The fixing plate (2) is also provided with an arc-shaped through hole parallel to the circular arc gear rail (30).

8. The forming device for a refrigerator side condenser tube according to claim 1, characterized in that: The feeding mechanism comprises a Y-axis gantry (14) on two X-axis guide rails (3); one end of the Y-axis gantry (14) is mounted on a lead screw mechanism mounted on a fixed plate (2) and parallel to the X-axis guide rail (3); a Y-axis guide rail (15) perpendicular to the X-axis guide rail (3) is mounted on the top of the fixed plate (2); an X-axis sliding plate (13) is mounted on the Y-axis guide rail (15); the X-axis sliding plate (13) is driven by the lead screw mechanism mounted on the Y-axis gantry (14); one end of the X-axis sliding plate (13) extends out of the side end of the tripod and is vertically mounted with a reversing mounting plate (16); a guide wheel (16) is mounted on the top of the reversing mounting plate (16). 18), two rows of pinch roller groups (12) are evenly installed on the end surface of the reversing mounting plate (16) facing away from the Y-axis gantry (14), the rotating shafts of the two rows of pinch roller groups (12) pass through the reversing mounting plate (16) and cooperate with the roller servo motor (24) installed on the other end surface of the reversing mounting plate (16) through gears, the bottom of the end surface of the reversing mounting plate (16) on which the pinch roller group (12) is installed is fixedly connected to a bottom plate perpendicular to the reversing mounting plate (16), and reversing servo motors (23) and 11 are respectively installed on the upper and lower end surfaces of the bottom plate, and a reversing gear (22) is also installed on the bottom plate to mesh with the reversing servo motor (23).

9. A forming device for a refrigerator side condenser tube as claimed in claim 8, characterized in that: The rotating shaft of the reversing gear (22) is hollow and passes through the bottom plate to be connected to the top of 11. The 11 is semicircular, and its inner ring is processed with a ring groove and equipped with a pulley.

10. A method for forming a refrigerator side condenser tube, comprising the following steps: S1, move the feeding mechanism to any clamping device (21), and make the direction of 11 face the clamping device (21); S2, passing the metal tube to be processed through the feeding mechanism and fixing its end in the clamping device (21); S3, the lead screw mechanism drives the X-axis sliding plate (13) and the Y-axis gantry (14) to move according to the condenser tube structure; S4, when the condenser tube moves to the position of the rotatable tube bending mold (9) or the fixed tube bending mold (10), the reversing servo motor (23) controls the rotation of the reversing device through gear transmission to rotate half a circle around the rotatable tube bending mold (9) or the fixed tube bending mold (10), so that the metal tube is bent around the rotatable tube bending mold (9) or the fixed tube bending mold (10); S5, finally transporting the metal tube to another clamping device (21) on the fixed plate (2) to clamp the metal tube, and driving the cutting device (20) to cut the metal tube; S6, driving the first pushing device and the second pushing device to shape the metal tube and then remove it; S7, driving the feeding mechanism back to step S1 and clamping the end of the metal pipe, and then repeating steps S3 to S6 for continuous processing.

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