JP5636187B2 - Pipe processing apparatus and pipe processing method - Google Patents

Description

  The present invention relates to a pipe processing apparatus and a pipe processing method.

  Conventionally, in various fields such as medical treatment, biotechnology, computer science, and electronic communication, various minute parts, that is, minute parts are used. Examples of the minute parts include tube members such as ultrafine tubes and ultrafine nozzles. For example, in the medical field, a painless injection needle formed by an ultrafine tube is used.

  Each said pipe member is shape | molded by processing pipes, such as metal and resin made as a pipe material, with a pipe processing apparatus.

  FIG. 2 is a diagram showing a state in which a pipe is machined by a conventional pipe machining apparatus.

  In the figure, 111 is a mold and 112 is a pipe. A plug, a mandrel, or the like is inserted into the pipe 112, and the pipe 112 is pulled in the direction of the arrow a in the mold 111 with the plug, the mandrel, or the like inserted. When a predetermined shape, for example, a tapered cavity is formed in the molding die 111, a tapered pipe member corresponding to the cavity can be molded.

  However, the tube processing apparatus is for forming a minute tube member, and since the dimensions are extremely small, it is difficult not only to form the forming die 111, the plug, the mandrel and the like accurately, but also to be thin. It is also difficult to insert a plug, mandrel or the like into the pipe 112.

  Therefore, a pipe processing method is provided in which a pipe member is formed by a dieless processing method that does not use a forming die. In this pipe processing method, a plurality of heating devices are arranged around the pipe, and a predetermined portion of the pipe is heated and softened by the heating device, and the pipe is pulled to reduce the diameter to reduce the diameter. A pipe member having a predetermined shape is formed by increasing the diameter by pressurizing or expanding the diameter (for example, refer to Patent Document 1).

JP 2009-148805 A

  However, in the conventional pipe processing method, when the pipe is pulled to reduce the diameter or pressurized to expand the diameter, the pipe diameter is reduced, or the pipe is expanded. Variations in the amount of diameter expansion representing the amount to be produced.

  Accordingly, the processing accuracy of the pipe is lowered, and the quality of the pipe member is lowered.

  The present invention provides a tube processing apparatus and a tube processing method capable of solving the problems of the conventional tube processing method, increasing the processing accuracy of the tube material, and improving the quality of the tube member. For the purpose.

  Therefore, in the tube processing apparatus of the present invention, a first gripping member that grips one end of the pipe material, a second gripping member that is movably disposed and grips the other end of the pipe material, 1. A heating body that is disposed at a predetermined location in a processing region of the pipe material set between the first and second gripping members and locally heats an annular heated portion in the pipe material, and the second A moving processing means for moving the gripping member, a heating processing means for driving the heating body and heating the heated portion while the second gripping member is moved, and a second gripping member A moving speed correction processing means for changing the moving speed, and a heating amount correction for changing the correction value of the energy supplied to the heating body with the passage of time based on the diameter of the tube material that changes with the passage of time. And processing means.

  According to the present invention, in the pipe processing apparatus, the first gripping member that grips one end of the pipe material, the second gripping member that is movably disposed and grips the other end of the pipe material, 1. A heating body that is disposed at a predetermined location in a processing region of the pipe material set between the first and second gripping members and locally heats an annular heated portion in the pipe material, and the second A moving processing means for moving the gripping member, a heating processing means for driving the heating body and heating the heated portion while the second gripping member is moved, and a second gripping member A moving speed correction processing means for changing the moving speed, and a heating amount correction for changing the correction value of the energy supplied to the heating body with the passage of time based on the diameter of the tube material that changes with the passage of time. And processing means.

  In this case, the diameter reduction amount or the diameter expansion amount of the pipe material can be changed by changing the speed of pulling or pressurizing the pipe material. Therefore, a pipe member having a complicated shape can be formed.

  Moreover, since the amount of diameter reduction or diameter expansion of a pipe material can be made to respond | correspond to the moving speed of a 2nd holding member, the processing precision of a pipe material can be made high and the quality of a pipe member can be improved. it can.

It is a figure explaining operation | movement of the pipe | tube processing apparatus in the 1st Embodiment of this invention. It is a figure which shows the state which processes a pipe with the conventional pipe processing apparatus. It is a conceptual diagram of the pipe | tube processing apparatus in the 1st Embodiment of this invention. It is a control block diagram of the pipe | tube processing apparatus in the 1st Embodiment of this invention. It is a time chart when changing the 2nd speed in the 1st embodiment of the present invention by the 1st pattern. It is a figure which shows the state of a diameter reduction when changing 2nd speed in the 1st Embodiment of this invention by a 1st pattern. It is a time chart when changing the 2nd speed in the 1st embodiment of the present invention by the 2nd pattern. It is a figure which shows the state of a diameter reduction when changing 2nd speed in the 1st Embodiment of this invention by a 2nd pattern. It is a figure explaining operation | movement of the pipe | tube processing apparatus in the 2nd Embodiment of this invention. It is a figure explaining operation | movement of the pipe | tube processing apparatus in the 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 3 is a conceptual diagram of the tube processing apparatus according to the first embodiment of the present invention.

  In the figure, 11 is a circular pipe as a metal pipe material conveyed in the direction of arrow A, and 12 is movably disposed upstream in the conveying direction of the pipe 11 and grips one end of the pipe 11. A chuck 13 serving as a first gripping member 13 is disposed downstream of the chuck 12 in the conveying direction of the pipe 11 so as to be movable independently of the chuck 12, and grips the other end of the pipe 11. 2 is a chuck as a gripping member, 15 is a bar as a guide member for guiding the chucks 12 and 13, 18 is a first moving mechanism for moving the chuck 12 in the direction of arrow A, and 19 is an arrow for the chuck 13. It is the 2nd moving mechanism made to move to A direction.

  In the present embodiment, a metal pipe 11 is used, but a resin pipe can be used. Further, in the present embodiment, a pipe 11 having a predetermined length is used, but a long pipe wound around a winder (not shown) is used for a feeding machine (not shown) at one end. can do.

  Each of the chucks 12 and 13 has a structure surrounding the pipe 11, grips the pipe 11 with a predetermined gripping force, and grips the pipe 11 with a first gripping position gripped by the chuck 12 and the chuck 13. The second grip position is set, and the processing region of the pipe 11 is set between the first and second grip positions. Then, the pipe 11 is processed in the processing region, and a pipe member having a predetermined shape is formed.

  For this purpose, an annular coil 14 is provided as a heating body for surrounding the pipe 11 and heating the pipe 11 locally in the axial direction and entirely in the circumferential direction at a predetermined location in the processing region. Then, an annular heated portion (processed portion) is formed at a location in the pipe 11 facing the coil 14. In this case, the coil 14 is fixed to a frame (not shown), and the number of turns of the coil 14 is reduced to, for example, about 1 to 5 in order to reduce the axial length of the heated portion.

  Further, a non-contact temperature sensor 40 as a temperature detector for detecting the temperature of the pipe 11 is disposed adjacent to the coil 14.

  In the present embodiment, a high-frequency current, that is, a high-frequency current is supplied to the coil 14 and the pipe 11 is heated by induction heating. However, a heater is used instead of the coil 14, and a current is supplied to the heater. And the pipe 11 can be heated with Joule heat.

  The first moving mechanism 18 includes a support portion 21 that supports the chuck 12, a ball nut (not shown) attached to the support portion 21, a ball screw shaft 22 that meshes with the ball nut, A motor 23 as a first drive unit connected to the ball screw shaft 22 is provided. When the ball screw shaft 22 is rotated by driving the motor 23, the support portion 21 is moved in the arrow A direction along the bar 15. For this purpose, a guide hole (not shown) for penetrating the bar 15 is formed in the support portion 21. The ball nut and the ball screw shaft 22 constitute a ball screw as a motion direction converting portion, and the rotational motion of the ball screw shaft 22 is converted into the straight motion of the ball nut. The ball nut constitutes a first conversion element, and the ball screw shaft 22 constitutes a second conversion element.

  The second moving mechanism 19 includes a support portion 25 that supports the chuck 13, a ball nut (not shown) attached to the support portion 25, a ball screw shaft 26 that meshes with the ball nut, and the ball screw shaft 26. And a motor 27 or the like as a second drive unit connected to the motor. When the ball screw shaft 26 is rotated by driving the motor 27, the support portion 25 is moved along the bar 15 in the direction of arrow A. Therefore, a guide hole (not shown) for penetrating the bar 15 is formed in the support portion 25. The ball nut and the ball screw shaft 26 constitute a ball screw as a motion direction converting portion, and the rotational motion of the ball screw shaft 26 is converted into a linear motion of the ball nut. The ball nuts constitute the first conversion element, and the ball screw shaft 26 constitutes the second conversion element.

  In the present embodiment, the motors 23 and 27 are arranged as the first and second drive units in the first and second moving mechanisms 18 and 19, but they are replaced with the motors 23 and 27. A hydraulic cylinder can be used. In that case, the said support parts 21 and 25 are attached to the piston of a hydraulic cylinder.

  Next, a control device for the tube processing apparatus will be described.

  FIG. 4 is a control block diagram of the tube processing apparatus according to the first embodiment of the present invention.

  In the figure, reference numeral 30 denotes a control unit, and the control unit 30 is connected to the motors 23 and 27 via a motor driver 31. The motors 23 and 27 are provided with encoders 34 and 35 as rotational speed detection units for detecting the rotational speeds of the motors 23 and 27, respectively.

  The control unit 30 is connected to the coil 14 via the oscillation circuit 39, the transformer 41, and the like, and is also connected to the temperature sensor 40.

  Next, the operation of the tube processing apparatus having the above configuration will be described.

  FIG. 1 is a diagram for explaining the operation of the tube processing apparatus according to the first embodiment of the present invention, and FIG. 5 is a diagram when the second speed in the first embodiment of the present invention is changed in the first pattern. FIG. 6 is a diagram showing a state of diameter reduction when the second speed in the first embodiment of the present invention is changed in accordance with the first pattern, and FIG. 7 is a diagram illustrating the first embodiment of the present invention. FIG. 8 is a time chart when the second speed in the embodiment is changed in the second pattern, and FIG. 8 is a reduction when the second speed in the first embodiment of the invention is changed in the second pattern. It is a figure which shows the state of a diameter.

In this case, when the speed at which the chuck 12 is moved in the direction of the arrow A (FIG. 3), that is, the moving speed is the first speed V1, and the moving speed of the chuck 13 is the second speed V2, the second speed V2. Is a speed equal to or higher than the first speed V1 V1 ≦ V2
To be. In the present embodiment, the first speed V1 is a constant value, and the second speed V2 is a variable value. Accordingly, the pipe 11 is transported at a constant transport speed represented by the first speed V1 and pulled at a variable tensile speed represented by the second speed V2. For this purpose, a movement processing means (not shown) of the control unit 30 performs a movement process, drives the motors 23 and 27 at a constant rotational speed N1 and a variable rotational speed N2, respectively, and moves the chucks 12 and 13.

  Then, while the chucks 12 and 13 are moved and the pipe 11 is being conveyed, a high frequency current is supplied to the coil 14 and the heated portion of the pipe 11 is heated. For this purpose, the heat treatment means (not shown) of the control unit 30 performs the heat treatment, operates the oscillation circuit 39, generates a high-frequency current, and sends it to the transformer 41. The transformer 41 receives a high-frequency current, converts the voltage, supplies it to the coil 14, and drives the coil 14. In the present embodiment, the high-frequency current is continuously supplied to the coil 14. However, the high-frequency current can be supplied to the coil 14 intermittently and every predetermined time.

  In this case, the temperature of the heated portion is controlled so as to become a preset target temperature, that is, the target temperature. For this purpose, the temperature sensor 40 detects the temperature of the heated part in the pipe 11 and sends the detected temperature, that is, the detected temperature to the control unit 30. The heat treatment means reads the detected temperature, calculates the deviation between the detected temperature and the target temperature, and controls the high-frequency current supplied to the coil 14 so that the deviation becomes zero (0).

  In this way, when the heated portion is heated and softened locally in the axial direction and entirely in the circumferential direction, the pipe 11 has the second speed V2 and the first speed per unit time. The pipe 11 is extended by a distance corresponding to the differential speed ΔVd representing the difference from V1, and accordingly, the pipe 11 is deformed and reduced in diameter in the heated portion.

If the tensile force when the pipe 11 is pulled by the chuck 13 is Fd, the tensile force Fd is proportional to the differential speed ΔVd,
Fd = kd · ΔVd (kd is a constant)
As the tensile force Fd is increased, the pipe 11 is greatly deformed and reduced in diameter.

In this case, the speed at which the pipe 11 before being reduced in diameter approaches the coil 14 is Va, the speed at which the pipe 11 after being reduced in diameter is separated from the coil 14 is Vb, and the pipe 11 before being reduced in diameter is disconnected. If the area is A1, and the cross-sectional area of the pipe 11 after being reduced in diameter is A2,
A1 ・ Va = A2 ・ Vb (1)
become. The cross-sectional areas A1 and A2 are both the area of the region surrounded by the outer peripheral edge of the pipe 11.

Also, assuming that the radius of the pipe 11 before being reduced in diameter is R1, and the radius of the pipe 11 after being reduced in diameter is R2, from Equation (1),
R1 ²・ Va = R2 ²・ Vb
Therefore, the radius R2 is

become.

In the present embodiment, the speeds Va and Vb are:
Va = V1
Vb = V2
Therefore, if the deformation rate due to the diameter reduction is r, the deformation rate r is
r = (Vb−Va) / Vb
= (V2-V1) / V2
= 1-V1 / V2 (3)
become.

  Incidentally, in the present embodiment, the second speed V2 can be changed in an arbitrary pattern as time t elapses. For this purpose, a moving speed change processing unit (not shown) of the control unit 30 performs a moving speed changing process and changes the rotation speed N2 of the motor 27 to change the second speed V2.

  In this case, when the second speed V2 is changed, the tensile force Fd is changed, so that the cross-sectional area A2 of the pipe 11 after being reduced in diameter is changed, and the deformation rate r is also changed. Therefore, the shape of the pipe 11 can be set corresponding to the pattern for changing the second speed V2.

Here, when the initial value of the second velocity V2 is V0, the rate of change per unit time, that is, the acceleration is α, and the second velocity V2 at time t is V (t), the second velocity V (T)
V (t) = V0 + αt (4)
It is represented by When the speed at which the pipe 11 is separated from the coil 14 at the time t after being reduced in diameter is Vb (t) and the diameter of the pipe 11 at the time t after being reduced in diameter is R2 (t),

become.

Further, when the length of the reduced diameter region, that is, the shape control length is x,
dx / dt = V (t)
= V0 + αt (6)
Therefore, the shape control length x is

become.

  In the equation (3), when the acceleration α is set to a constant value, as shown in FIG. 5, the second speed V (t) increases with a constant slope as time t passes. Therefore, as shown in FIG. 6, the pipe 11 is reduced in diameter with a certain inclination.

  Further, when the acceleration α is changed with the lapse of time t, the pattern in which the second speed V (t) changes is changed, and the shape of the pipe 11 is also changed. For example, when the acceleration α is increased with the lapse of time t, the second speed V (t) is rapidly increased, and the gradient at which the pipe 11 is reduced in diameter is increased. When the acceleration α is decreased with the passage of time t, the second speed V (t) is gradually increased, and the gradient with which the diameter of the pipe 11 is reduced is decreased.

  Further, as shown in FIG. 7, when the second speed V (t) is increased stepwise as time t passes, the pipe 11 is gradually reduced in diameter as shown in FIG. It is done. The pipe 11 is smoothly reduced in diameter as the time δt for maintaining the second speed V (t) at the same value when the second speed V (t) is changed stepwise is shortened.

  By the way, when the second speed V (t) is increased, the diameter R2 (t) of the pipe 11 after being reduced in diameter is reduced, the distance between the coil 14 and the heated portion is increased, and the heated portion is heated. The heat generated by induction heating in the part is reduced in inverse proportion to the square of the distance, and the heating surface of the heated part is reduced. Therefore, the heating amount correction processing means (not shown) of the control unit 30 performs the heating amount correction processing, and corrects the energy supplied to the coil 14, in the present embodiment, the high frequency current based on the diameter R2 (t). To do.

That is, if the initial value of the high-frequency current is I0, the high-frequency current at time t is I (t), and the correction value that is changed as time elapses is ΔI (t), the high-frequency current I (t) Is
I (t) = I0 + ΔI (t)
To be.

  Thus, in the present embodiment, since the second speed V2 is changed, the pipe 11 can be pulled at a variable pulling speed, and the diameter reduction amount of the pipe 11 can be changed. Therefore, a pipe member having a complicated shape can be formed.

  Moreover, since the amount of diameter reduction of the pipe 11 can be made to correspond to the moving speed of the chuck 13, the processing accuracy of the pipe 11 can be increased, and the quality of the pipe member can be improved.

  By the way, in this Embodiment, although 2nd speed V2 is made more than 1st speed V1, 2nd speed V2 can be made lower than 1st speed V1. In that case, the pipe 11 is deformed and expanded in diameter by the amount pressurized by the chuck 13.

That is, when the pressing force when the pipe 11 is pressurized by the chuck 13 is Fp, the pressing force Fp is proportional to a differential speed ΔVp representing a difference between the first speed V1 and the second speed V2.
Fp = kp · ΔVp (kp is a constant)
become. The pipe 11 is greatly deformed and expanded in diameter as the pressure Fp is increased.

  Further, the second speed V2 can be changed in an arbitrary pattern. That is, the second speed V2 can be increased by the acceleration α or decreased by the deceleration β.

  In that case, the amount of diameter reduction or the amount of diameter expansion of the pipe 11 can be changed by changing the speed at which the pipe 11 is pulled or the speed at which the pipe 11 is pressurized. Therefore, a pipe member having a complicated shape can be formed.

  Moreover, since the amount of diameter reduction or diameter expansion of the pipe 11 can be made to respond | correspond to the moving speed of the chuck | zipper 13, the processing precision of the pipe 11 can be made high and the quality of a pipe member can be improved.

  Next, a second embodiment of the present invention in which one end of the pipe 11 is fixed and the coil 14 is moved toward the chuck 12 will be described. In addition, about the thing which has the same structure as 1st Embodiment, the same code | symbol is provided and the effect of the same embodiment is used about the effect of the invention by having the same structure.

  FIG. 9 is a diagram for explaining the operation of the tube processing apparatus according to the second embodiment of the present invention.

  In this case, in the first moving mechanism 18 (FIG. 3), the motor 23 as the first drive unit is stopped, and the chuck 12 as the first gripping member is fixed. Further, the coil 14 as the heating body is moved in the arrow B direction toward the chuck 12 at the third speed V3, and the chuck 13 as the second gripping member is moved in the arrow A direction at the fourth speed V4. It is done.

  In order to move the coil 14, a third moving mechanism (not shown) is provided. The third moving mechanism has a structure similar to that of the first and second moving mechanisms 18 and 19, and includes a support portion for supporting the coil 14, a ball nut attached to the support portion, and meshing with the ball nut. And a motor as a third drive unit connected to the ball screw shaft. When the ball screw shaft is rotated by driving the motor, the support portion is moved along the bar as the guide member.

  In the present embodiment, the third speed V3 is a constant value, and the fourth speed V4 is a variable value. Therefore, the pipe 11 as the pipe material is pulled at a variable tensile speed represented by the fourth speed V4.

  And while the coil 14 is moved toward the chuck | zipper 12, a high frequency current is supplied to the coil 14 and the to-be-heated part of the pipe 11 is heated.

  Thus, when the heated portion is heated and softened locally in the axial direction and entirely in the circumferential direction, the pipe 11 extends by a distance corresponding to the fourth speed V4 per unit time. Accordingly, the pipe 11 is deformed in the heated portion and is reduced in diameter.

When the tensile force when the pipe 11 is pulled by the chuck 13 is Fe, the tensile force Fe is proportional to the fourth speed V4.
Fe = ke · V4 (ke is a constant)
become. The larger the tensile force Fe, the more the pipe 11 is deformed and the diameter is reduced.

In this case, the speed at which the pipe 11 before being reduced in diameter approaches the coil 14 is Va, the speed at which the pipe 11 after being reduced in diameter is separated from the coil 14 is Vb, and the pipe 11 before being reduced in diameter is disconnected. Assuming that the area is A1 and the cross-sectional area of the pipe 11 after being reduced in diameter is A2, as in the first embodiment,
A1 ・ Va = A2 ・ Vb
become.

In this embodiment, the speeds Va and Vb are
Va = V3
Vb = V3 + V4
It is.

  Next, a third embodiment of the present invention in which one end of the pipe 11 is fixed and the coil 14 is moved toward the chuck 13 will be described. In addition, about the thing which has the same structure as 1st, 2nd embodiment, the same code | symbol is provided and the effect of the embodiment is used about the effect of the invention by having the same structure.

  FIG. 10 is a diagram for explaining the operation of the tube processing apparatus according to the third embodiment of the present invention.

  In this case, in the first moving mechanism 18 (FIG. 3), the motor 23 as the first driving unit is stopped, and the chuck 13 as the second gripping member is fixed. Further, the coil 14 as the heating body is moved in the direction of arrow A toward the chuck 13 at the fifth speed V5, and the chuck 13 is moved in the direction of arrow A at the sixth speed V6.

  In the present embodiment, in order to move the coil 14, a third moving mechanism similar to the second embodiment is provided.

  The fifth speed V5 is set to a constant value, and the sixth speed V6 is set to a variable value. Therefore, the pipe 11 as the pipe material is pulled at a variable tensile speed represented by the sixth speed V6.

  And while the coil 14 is moved toward the chuck | zipper 13, a high frequency current is supplied to the coil 14 and the to-be-heated part of the pipe 11 is heated.

  In this way, when the heated part is heated and softened locally in the axial direction and entirely in the circumferential direction, the pipe 11 extends by a distance corresponding to the sixth speed V6 per unit time. Accordingly, the pipe 11 is deformed in the heated portion and is reduced in diameter.

If the tensile force when the pipe 11 is pulled by the chuck 13 is Ff, the tensile force Ff is proportional to the sixth speed V6,
Ff = kf · V6 (kf is a constant)
become. As the tensile force Ff is increased, the pipe 11 is greatly deformed and reduced in diameter.

In this case, the speed at which the pipe 11 before being reduced in diameter approaches the coil 14 is Va, the speed at which the pipe 11 after being reduced in diameter is separated from the coil 14 is Vb, and the pipe 11 before being reduced in diameter is disconnected. Assuming that the area is A1 and the cross-sectional area of the pipe 11 after being reduced in diameter is A2, as in the first embodiment,
A1 ・ Va = A2 ・ Vb
become.

In this embodiment, the speeds Va and Vb are
Va = V5
Vb = V5 + V6
It is.

  By the way, in each said embodiment, although the coil 14 is arrange | positioned as a heating body, it replaces with the coil 14, uses a laser apparatus, and heats the pipe 11 by irradiating a laser beam. You can also

  In this case, as in the first embodiment, when the speed at which the pipe 11 is pulled is increased, the diameter R2 (t) of the pipe 11 after the diameter reduction is reduced, and the irradiation area when the laser beam is irradiated is reduced. Get smaller. Therefore, the heating amount correction processing unit of the control unit 30 corrects the energy supplied to the laser device based on the diameter R2 (t) with the passage of time.

  In each of the embodiments, the heating amount correction processing unit corrects the energy supplied to the coil 14, the laser device, and the like based on the diameter R2 (t) of the pipe 11. In this case, the heating amount correction processing means can not only correct the energy by performing feedback control, but also correct the energy by performing intelligent control such as fuzzy control and neural network control. Furthermore, based on the diameter R2 (t) of the pipe 11, in addition to correcting the energy supplied to the coil 14, the laser device, etc., the second speed V (t) can also be corrected.

  The present invention is not limited to the above embodiments, and various modifications can be made based on the gist of the present invention, and they are not excluded from the scope of the present invention.

11 Pipe 12, 13 Chuck 14 Coil 30 Controller

Claims (5)

(A) a first gripping member for gripping one end of the pipe material;
(B) a second gripping member that is movably disposed and grips the other end of the pipe material;
(C) A heating body that is disposed at a predetermined position in the processing region of the pipe material set between the first and second gripping members and locally heats the annular heated portion in the pipe material. When,
(D) movement processing means for moving the second gripping member;
(E) heat treatment means for driving the heating body and heating the heated portion while the second gripping member is moved;
(F) moving speed change processing means for changing the moving speed of the second gripping member;
(G) It has heating amount correction processing means for changing a correction value of energy supplied to the heating body with the passage of time based on the diameter of the pipe material that changes with the passage of time. Pipe processing equipment.   The tube processing apparatus according to claim 1, wherein the movement processing unit changes a moving speed of the second gripping member as time elapses. (A) the first gripping member is movably disposed;
(B) The tube processing apparatus according to claim 1 or 2, wherein the heating body is fixed at a predetermined position between the first and second gripping members. (A) the first gripping member is fixed;
(B) The tube processing apparatus according to claim 1 or 2, wherein the heating body is movably disposed between the first and second gripping members. A first gripping member for gripping one end of the pipe material; a second gripping member that is movably disposed and grips the other end of the pipe material; and the first and second gripping members set between the first gripping member and the first gripping member In the tube processing method of the tube processing apparatus, which is disposed at a predetermined position in the processing region of the tube material and includes a heating body for locally heating the annular heated portion in the tube material,
(A) moving the second gripping member;
(B) While the second gripping member is moved, the heating body is driven to heat the heated portion,
(C) changing the moving speed of the second gripping member;
(D) A tube processing method, wherein the correction value of the energy supplied to the heating body is changed based on the diameter of the tube material that changes with time .

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