EP3431205B1 - Tube diameter expanding method and forming apparatus - Google Patents

Tube diameter expanding method and forming apparatus Download PDF

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Publication number
EP3431205B1
EP3431205B1 EP16894259.7A EP16894259A EP3431205B1 EP 3431205 B1 EP3431205 B1 EP 3431205B1 EP 16894259 A EP16894259 A EP 16894259A EP 3431205 B1 EP3431205 B1 EP 3431205B1
Authority
EP
European Patent Office
Prior art keywords
tube
roller
forming region
rod
radial direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16894259.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3431205A1 (en
EP3431205A4 (en
Inventor
Ken IKAWA
Yoshihide IMAMURA
Kohei MIKAMI
Hayato Iwasaki
Takeo HIRAKAWA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kawasaki Heavy Industries Ltd
Kawasaki Motors Ltd
Original Assignee
Kawasaki Heavy Industries Ltd
Kawasaki Jukogyo KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kawasaki Heavy Industries Ltd, Kawasaki Jukogyo KK filed Critical Kawasaki Heavy Industries Ltd
Publication of EP3431205A1 publication Critical patent/EP3431205A1/en
Publication of EP3431205A4 publication Critical patent/EP3431205A4/en
Application granted granted Critical
Publication of EP3431205B1 publication Critical patent/EP3431205B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/16—Making tubes with varying diameter in longitudinal direction
    • B21C37/18—Making tubes with varying diameter in longitudinal direction conical tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14—Spinning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/02—Enlarging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/02—Enlarging
    • B21D41/021—Enlarging by means of tube-flaring hand tools
    • B21D41/023—Enlarging by means of tube-flaring hand tools comprising rolling elements

Definitions

  • the present invention relates to a tube diameter expanding method and a forming apparatus for implementing the same.
  • PTL 1 discloses a tube diameter expanding method using a pair of disk rollers.
  • a tube having one end thereof fixed to a turntable is rotated about a center axis of the tube in a state where the tube is sandwiched between a first roller disposed in the tube and a second roller disposed outside the tube. Then, the first roller and the second roller are moved in a direction from one end toward the other end of the tube and outward in a radial direction of the tube. As a result, the first roller presses the tube, and a section extending from the pressed position to the other end is expanded in diameter.
  • the second roller plays a role of enhancing formability of the diameter-expanded section.
  • an object of the present invention is to suppress deformation of a non-forming region of a heated tube when a rod-like roller is pressed against a heated forming region of the tube.
  • the present invention provides a tube diameter expanding method including: a step for rotating a tube having one end fixed to a turntable about a center axis of the tube; characterized by: a step for inserting a rod-like roller extending in an axial direction of the tube into the tube from the other end of the tube, and bringing the rod-like roller into contact with a forming region extending from the other end to a predetermined position of the tube; a step for heating the forming region of the tube; a step for cooling at least a section located near the forming region and within a non-forming region extending from the predetermined position to the one end of the tube; and a step for moving the rod-like roller in a state of contacting the forming region of the tube, in a direction from the one end of the tube toward the other end of the tube and outward in a radial direction of the tube.
  • the rod-like roller is pressed against the heated forming region of the tube. Therefore, it is possible to expand the forming region in diameter with a relatively small pushing force while suppressing occurrence of necking.
  • the section located near the forming region and within the non-forming region of the tube is cooled, it is possible to suppress deformation of the non-forming region when the rod-like roller is pressed against the heated forming region.
  • the forming region of the tube may be heated from outside of the tube. According to this configuration, it is possible to further suppress protrusion of an inner peripheral surface of the tube which may be caused by pressing of the rod-like roller as compared to a case where the forming region is heated from inside of the tube.
  • the forming region of the tube may be heated by induction heating.
  • induction heating In a case where a burner is used to heat the forming region of the tube, a temperature gradient between the forming region and the non-forming region becomes gentle. In contrast, in a case where the forming region is heated by induction heating, the temperature gradient between the forming region and the non-forming region becomes steep. Therefore, if the forming region is heated by induction heating, deformation of the non-forming region can be more effectively suppressed. In other words, it is possible to accurately form a tapered portion in the non-forming region indicating a track of the rod-like roller.
  • the forming region of the tube may be heated by using a heater including a heating head that faces an inner peripheral surface or an outer peripheral surface of the tube.
  • a heater including a heating head that faces an inner peripheral surface or an outer peripheral surface of the tube.
  • the non-forming region of the tube may be cooled by using a cooler including a cooling head that supplies cooler agent to the outer peripheral surface of the tube.
  • a cooler including a cooling head that supplies cooler agent to the outer peripheral surface of the tube.
  • the rod-like roller in a state of contacting the forming region of the tube may be moved in the direction from the one end toward the other end of the tube and outward in the radial direction of the tube. According to this configuration, deflection of the tube during forming can be prevented.
  • the tip of the rod-like roller may be flat. According to this configuration, it is possible to further suppress interference between the rod-like roller and the tapered portion in the non-forming region indicating the track of the rod-like roller as compared to a case where the tip of the rod-like roller is semi-spherical. Therefore, it is possible to accurately expand the forming region of the tube in diameter.
  • the tube may have a thickness of 8 mm or more.
  • the present invention provides a forming apparatus including: a turntable to which one end of a tube is fixed; characterized by: a rod-like roller which extends in an axial direction of the tube, the rod-like roller being inserted into the tube from the other end of the tube and being brought into contact with a forming region extending from the other end of the tube to a predetermined position; a heater which heats the forming region of the tube; a cooler which cools at least a section located near the forming region and within a non-forming region extending from the predetermined position to the one end of the tube; and a roller moving device which moves the rod-like roller in the axial direction and a radial direction of the tube.
  • the present invention it is possible to suppress deformation of the non-forming region of the heated tube when the rod-like roller is pressed against the heated forming region of the tube.
  • Embodiment 1 of the present invention a tube diameter expanding method according to Embodiment 1 of the present invention will be described.
  • the diameter expanding method according to the present embodiment is implemented by a forming apparatus 1A illustrated in Fig. 1 .
  • the forming apparatus 1A partially expands a tube 2 in diameter by spinning forming.
  • the material constituting the tube 2 is not particularly limited; however, the diameter expanding method according to the present embodiment is particularly useful for the tube 2 made of metal having high deformation resistance.
  • the metal having high deformation resistance include a worked material which is difficult to plastically deform such as stainless steel or a titanium alloy. Even if the tube 2 is not made of the worked material which is difficult to plastically deform but is made of soft steel or an aluminum alloy having a thickness of 8 mm or more, deformation resistance becomes high.
  • the forming apparatus 1A includes a base 11 and a turntable 12 rotatably supported by the base 11.
  • the turntable 12 is rotated by a motor, not illustrated.
  • an axial direction of the turntable 12 is a vertical direction; however, the axial direction of the turntable 12 may be another direction such as a horizontal direction.
  • a lower end (one end) of the tube 2 is fixed to the turntable 12 such that a center axis 20 of the tube 2 and a rotation center of the turntable 12 are aligned.
  • the tube 2 is rotated about the center axis 20.
  • the lower end of the tube 2 is fixed to the turntable 12 by a chuck 13 provided on the turntable 12.
  • the method of fixing the lower end of the tube 2 to the turntable 12 is not limited to this.
  • a tubular body fitted with the tube 2 may be provided on the turntable 12, and the lower end of the tube 2 may be fixed to the tubular body with a bolt.
  • the forming apparatus 1A includes a rod-like roller 3 that presses the tube 2 from inside, a heater 4 that heats the tube 2 from outside, and a cooler 5 that cools the tube 2 from outside.
  • the rod-like roller 3 extends in the axial direction of the tube 2 and has a cylindrical shape.
  • the rod-like roller 3 is inserted into the tube 2 from an upper end (the other end) of the tube 2 and is brought into contact with a forming region 21 extending from the upper end to a predetermined position of the tube 2.
  • a tip of the rod-like roller 3 is flat and parallel to a plane orthogonal to the axial direction of the tube 2. Therefore, a peripheral surface of the rod-like roller 3 is connected to a tip surface of the rod-like roller 3 via a curved portion of the rod-like roller 3, the curved portion having a small curvature radius.
  • the axial direction of the rod-like roller 3 is not necessarily required to be perfectly parallel to the axial direction of the tube 2 but may be substantially parallel (for example, an angular difference between the axial directions is within ⁇ 10 degrees).
  • the peripheral surface of the rod-like roller 3 may have a tubular shape parallel to the axial direction of the tube 2, or may be a tapered shape tapering upward or downward. Further, the peripheral surface of the rod-like roller 3 is not necessarily smooth and may have small unevenness.
  • the rod-like roller 3 is provided with a shaft 31 that projects upward from an upper-end surface of the rod-like roller 3.
  • the shaft 31 is rotatably supported by an arm 15.
  • the rod-like roller 3 rotates following rotation of the tube 2 when the rod-like roller 3 contacts the forming region 21 of the tube 2.
  • the arm 15 is connected to a first moving device 14 attached to a post 14a rising from the base 11.
  • the first moving device 14 functions as a roller moving device that moves the rod-like roller 3 in the axial direction and a radial direction of the tube 2 via the arm 15.
  • the first moving device 14 includes a pair of linear actuators whose axial directions are orthogonal to each other.
  • Each linear actuator may be an electric/hydraulic/pneumatic cylinder, a ball screw mechanism, or a rack-and-pinion mechanism.
  • the first moving device 14 may be a robot arm.
  • the heater 4 heats the forming region 21 of the tube 2.
  • the heater 4 heats the forming region 21 of the tube 2 by induction heating.
  • the heater 4 includes a heating head 41 facing an outer peripheral surface of the tube 2, a plurality of coils 42 embedded in the heating head 41, and an AC power supply circuit 43 applying an AC voltage to the coils 42.
  • a frequency of the AC voltage is a high frequency in a range from 5 k to 400 kHz.
  • induction heating is desirably high-frequency induction heating.
  • an angle between the heating head 41 and the rod-like roller 3 in a circumferential direction of the tube 2 is 180 degrees.
  • the angle between the heating head 41 and the rod-like roller 3 in the circumferential direction of the tube 2 may be another angle such as 90 degrees.
  • each coil 42 has an oval shape long in the circumferential direction of the tube 2.
  • each of the coils 42 may have an oval shape long in the axial direction of the tube 2.
  • only one coil 42 may be provided so as to form a polygon (for example, a triangle). Note that a plurality of heating heads 41 may be provided side by side in the circumferential direction of the tube 2.
  • the cooler 5 cools at least a section (i.e., an upper portion) located near the forming region 21 and within a non-forming region 22 (i.e., the region other than the forming region 21 of the tube 2) extending from the predetermined position described above to the lower end of the tube 2.
  • the cooler 5 cools the non-forming region 22 of the tube 2 by heat transfer to cooler agent.
  • the cooler 5 includes a cooling head 51 that supplies cooler agent to the outer peripheral surface of the tube 2, and a delivery device 52 which delivers cooler agent to the cooling head 51 and whose revolution speed can be changed.
  • the delivery device 52 may be a compressor or a fan.
  • the delivery device 52 may be a pump.
  • a heating temperature of the forming region 21 by the heater 4 is desirably not lower than one third of a melting point of the material constituting the tube 2, and more desirably not lower than one half of the melting point. It is desirable that a cooling temperature of the upper portion of the non-forming region 22 by the cooler 5 is set so that the upper portion of the non-forming region 22 is not deformed when the rod-like roller is pressed against the forming region 21.
  • the heater 4 heats entirety of the forming region 21 to approximately an identical temperature.
  • the cooler 5 desirably cools at least the upper portion of the non-forming region 22 such that the temperature is lowered to a temperature not higher than one quarter of the melting point of the material constituting the tube 2 in a minimal range extending from the upper end of the non-forming region 22 to a position slightly away from the upper end in the non-forming region 22.
  • the minimal range is substantially equal to the height of the curved portion of the rod-like roller 3.
  • the heating head 41 of the heater 4 and the cooling head 51 of the cooler 5 are attached to a holding plate 18.
  • the holding plate 18 is connected to a second moving device 17 attached to a post 17a rising from the base 11.
  • the second moving device 17 functions as a heating-head moving device that moves the heating head 41 in the axial direction and the radial direction of the tube 2 via the holding plate 18 and also functions as a cooling-head moving device that moves the cooling head 51 in the axial direction and the radial direction of the tube 2 via the holding plate 18.
  • the second moving device 17 includes a pair of linear actuators whose axial directions are orthogonal to each other.
  • Each linear actuator may be an electric/hydraulic/pneumatic cylinder, a ball screw mechanism, or a rack-and-pinion mechanism.
  • the second moving device 17 may be a robot arm.
  • the heating head 41 may be attached to the arm 15, and the first moving device 14 may function as the heating-head moving device.
  • the cooling head 51 may be attached to the arm 15, and the first moving device 14 may function as the cooling-head moving device.
  • a moving device exclusive for the heating head 41 and a moving device exclusive for the cooling head 51 may be separately provided.
  • control device 6 may be a sequencer (registered trademark), or may be a computer including a CPU and memories such as a ROM and a RAM.
  • the control device 6 is connected to a first temperature sensor 61 and a second temperature sensor 62.
  • the first temperature sensor 61 detects the temperature of the forming region 21 of the tube 2.
  • the second temperature sensor 62 detects the temperature of the upper portion of the non-forming region 22 of the tube 2.
  • each of the first temperature sensor 61 and the second temperature sensor 62 is a radiation thermometer that detects temperature according to infrared light or visible light.
  • the first temperature sensor 61 and the second temperature sensor 62 are attached to a bracket 16 suspended from the arm 15.
  • the first temperature sensor 61 and the second temperature sensor 62 move together with the rod-like roller 3.
  • the first temperature sensor 61 and the second temperature sensor 62 may be attached to the holding plate 18.
  • the first temperature sensor 61 and the second temperature sensor 62 may be moved by a moving device other than the first moving device 14 and the second moving device 17, or may be fixed in a fixed position.
  • the control device 6 controls output from the heater 4 and the cooler 5. Specifically, the control device 6 controls the AC power supply circuit 43 of the heater 4 according to the temperature detected by the first temperature sensor 61, and controls the delivery device 52 of the cooler 5 according to the temperature detected by the second temperature sensor 62. However, in lieu of the delivery device 52 whose revolution speed can be changed, a delivery device whose revolution speed is constant and a flow control valve provided in a flow path from the delivery device to the cooling head may be used, and the flow control valve may be controlled by the control device 6.
  • the first moving device 14 inserts the rod-like roller 3 into the tube 2 from the upper end of the tube 2 and brings the rod-like roller 3 into contact with the forming region 21 of the tube 2 (see Fig. 2 ). Then, the turntable 12 rotates the tube 2 about the center axis 20. However, rotation of the tube 2 may be started before the rod-like roller 3 is inserted into the tube 2.
  • the heater 4 heats the forming region 21, and the cooler 5 cools at least the upper portion of the non-forming region 22.
  • the first moving device 14 moves the rod-like roller 3 in a state of contacting the forming region 21 of the tube 2, in a direction from the lower end toward the upper end of the tube 2 (i.e., upward) and outward in the radial direction of the tube 2.
  • the second moving device 17 moves the heating head 41 and the cooling head 51 in the axial direction and the radial direction of the tube 2 in synchronization with movement of the rod-like roller 3.
  • synchronization means that, in each of the axial direction and the radial direction of the tube 2, a movement amount of the heating head 41 and the cooling head 51 is identical to a movement amount of the rod-like roller 3.
  • movement of the rod-like roller 3 in the axial direction of the tube 2 and movement of the rod-like roller 3 in the radial direction of the tube 2 are separately and intermittently performed, as will be described later.
  • the heating head 41 and the cooling head 51 are moved only in the axial direction of the tube 2 by the amount identical to the movement amount of the rod-like roller 3.
  • the heating head 41 and the cooling head 51 are moved only in the radial direction of the tube 2 by the amount identical to the movement amount of the rod-like roller 3.
  • the control device 6 controls the AC power supply circuit 43 of the heater 4 so that the temperature detected by the first temperature sensor 61 becomes a desired temperature and controls the delivery device 52 of the cooler 5 so that the temperature detected by the second temperature sensor 62 becomes a desired temperature.
  • the forming region 21 gradually narrows and the non-forming region 22 gradually widens (see Fig. 3 ) accordingly.
  • the section which is the lower end of the forming region 21 becomes a tapered portion expanded in diameter (i.e., the tapered portion indicates a track of the rod-like roller 3), and the tapered portion becomes part of the non-forming region 22.
  • Each of movement of the rod-like roller 3 in the axial direction of the tube 2 and movement of the rod-like roller 3 in the radial direction of the tube 2 may be performed continuously or the movements may be performed separately and intermittently.
  • the movement amount of the rod-like roller 3 in the axial direction of the tube 2 may be far greater (the angle of the tapered portion in the non-forming region 22 is small), or may be far smaller (the angle of the tapered portion in the non-forming region 22 is large) than the movement amount of the rod-like roller 3 in the radial direction of the tube 2.
  • Movement of the rod-like roller 3 upward and outward in the radial direction of the tube 2 is terminated when the forming region 21 is expanded in diameter by a desired amount as illustrated in Fig. 3 . Therefore, it is possible to expand the tube 2 in diameter such that the tapered portion exists between a small-diameter tubular portion and a large-diameter tubular portion, in other words, the tube 2 has one stepped portion. Then, after once the rod-like roller 3 is removed from the tube 2 and moved slightly upward, the above-described operation is repeated. Thus, the tube 2 can be expanded in diameter such that the tube 2 has a plurality of stepped portions. However, the rod-like roller 3 may be moved upward to the upper end of the tube 2 in order to expand the tube 2 in diameter such that the tube 2 only has the small-diameter tubular portion and the tapered portion.
  • the rod-like roller 3 is pressed against the heated forming region 21 of the tube 2. Therefore, it is possible to expand the forming region 21 in diameter with a relatively small pushing force while suppressing occurrence of necking.
  • the rod-like roller 3 is pressed against the heated forming region 21.
  • the heating head 41 is moved in the radial direction of the tube 2 in synchronization with movement of the rod-like roller 3 in the radial direction of the tube 2, the distance between the forming region 21 of the tube 2 and the heating head 41 can be kept approximately constant. Therefore, it is possible to expand the forming region 21 in diameter while stably heating the forming region 21.
  • the heating head 41 is also moved in the axial direction of the tube 2 in synchronization with movement of the rod-like roller 3 in the axial direction of the tube 2. Therefore, it is possible to keep positional relationship between the tip of the rod-like roller 3 and the heating head 41 unchanged even if the forming region 21 gradually narrows as the rod-like roller 3 moves in the axial direction of the tube 2.
  • the cooling head 51 is moved in synchronization with movement of the rod-like roller 3. Therefore, it is possible to keep positional relationship between the tip of the rod-like roller 3 and the cooling head 51 unchanged even if the forming region 21 gradually narrows as the rod-like roller 3 moves in the axial direction of the tube 2. Therefore, at least the upper portion of the non-forming region 22 can be continuously cooled.
  • a forming apparatus 1B illustrated in Fig. 6 implements the tube diameter expanding method.
  • an angle between a heating head 41 and a rod-like roller 3 in a circumferential direction of a tube 2 is 90 degrees.
  • the rod-like roller 3 is moved in an up-down direction and a direction orthogonal to the paper surface of Fig. 6 by a first moving device 14 (not illustrated in Fig. 6 ).
  • the forming apparatus 1B includes an auxiliary roller 7.
  • the other configuration of the forming apparatus 1B is identical to that of the forming apparatus 1A of Embodiment 1.
  • the auxiliary roller 7 extends in an axial direction of the tube 2 and has a cylindrical shape with a semi-spherical tip.
  • an angle between the rod-like roller 3 and the auxiliary roller 7 in the circumferential direction of the tube 2 is 90 degrees.
  • the angle between the rod-like roller 3 and the auxiliary roller 7 in the circumferential direction of the tube 2 may be another angle such as 180 degrees.
  • the auxiliary roller 7 comes into contact with at least an upper portion (section including an upper end of the tube 2) of a forming region 21 from outside the tube 2.
  • a length of the auxiliary roller 7 is shorter than a length of the rod-like roller 3 and comes into contact with only the upper portion of the forming region 21.
  • the length of the auxiliary roller 7 may be equal to or longer than that of the rod-like roller 3, and the auxiliary roller 7 may be brought into contact with entirety of the forming region 21.
  • the auxiliary roller 7 is provided with a shaft 71 that projects upward from an upper-end surface of the auxiliary roller 7.
  • the shaft 71 is rotatably supported by an arm 81.
  • the auxiliary roller 7 rotates following rotation of the tube 2 when the auxiliary roller 7 contacts the upper portion of the forming region 21 of the tube 2.
  • the arm 81 is connected to a linear actuator 82 attached to a post 83 rising from a base 11.
  • the linear actuator 82 moves the auxiliary roller 7 in a radial direction of the tube 2 via the arm 81.
  • the linear actuator 82 may be an electric/hydraulic/pneumatic cylinder, a ball screw mechanism, or a rack-and-pinion mechanism.
  • the linear actuator 82 is controlled by a control device 6 so that the auxiliary roller 7 is always pressed against the tube 2 with a constant pressing force.
  • the auxiliary roller 7 supports at least the upper end of the tube 2 from outside in the radial direction.
  • the rod-like roller 3 is pressed against the forming region 21.
  • a thickness of the forming region 21 becomes thinner as the diameter expands. Therefore, a moving speed of the auxiliary roller 7 in the radial direction of the tube 2 is slower than a moving speed of the rod-like roller 3 in the radial direction of the tube 2.
  • a heater 4 may be disposed such that a heating head 41 faces an inner peripheral surface of a tube 2, and a forming region 21 may be heated from inside of the tube 2.
  • a forming region 21 may be heated from outside of the tube 2, it is possible to further suppress protrusion of the inner peripheral surface of the tube 2 which may be caused by pressing of a rod-like roller 3 as compared to a case where the forming region 21 is heated from inside of the tube 2.
  • a cooler 5 may also be disposed such that a cooling head 51 supplies cooler agent to the inner peripheral surface of the tube 2, and may cool at least an upper portion of a non-forming region 22 from inside of the tube 2.
  • the heater 4 does not necessarily heat the forming region 21 of the tube 2 by induction heating.
  • a burner emitting a flame from a nozzle may be used as the heater 4.
  • a temperature gradient between the forming region 21 and the non-forming region 22 becomes gentle.
  • the temperature gradient between the forming region 21 and the non-forming region 22 becomes steep. Therefore, if the forming region 21 is heated by induction heating, deformation of the non-forming region 22 can be more effectively suppressed. In other words, it is possible to accurately form a tapered portion in the non-forming region 22 indicating a track of the rod-like roller 3.
  • a second moving device 17 may not have the function of moving the heating head 41 and the cooling head 51 in the axial direction of the tube 2, and may only have the function of moving the heating head 41 and the cooling head 51 in the radial direction of the tube 2.
  • a first moving device 14 moves the rod-like roller 3 in a state of contacting the forming region 21 of the tube 2, upward and outward in the radial direction of the tube 2
  • the second moving device 17 may move the heating head 41 and the cooling head 51 in the radial direction of the tube 2 in synchronization with only movement of the rod-like roller 3 in the radial direction of the tube 2.
  • either one or both of the heating head 41 and the cooling head 51 may be fixed in a fixed position.
  • the cooling head 51 may be fixed at a fixed position and a supply amount of cooler agent to be supplied to the inner peripheral surface or an outer peripheral surface of the tube 2 may be controlled according to a second temperature sensor 62.
  • the cooler 5 does not necessarily have to cool at least the upper portion of the non-forming region 22 of the tube 2 by heat transfer to cooler agent.
  • the cooler 5 may be configured to cool at least the upper portion of the non-forming region 22 by contacting a heat radiator that deforms according to forming of the tube 2.
  • a tip of the rod-like roller 3 may be semi-spherical. However, if the tip of the rod-like roller 3 is flat, it is possible to further suppress interference between the rod-like roller 3 and a tapered portion indicating the track of the rod-like roller 3 in the non-forming region 22 as compared to a case where the tip of the rod-like roller 3 is semi-spherical. Therefore, it is possible to accurately expand the forming region 21 of the tube 2 in diameter.
  • heating of the forming region 21 of the tube 2, cooling of at least the upper portion of the non-forming region 22 of the tube 2, and pressing of the rod-like roller 3 against the forming region 21 are not necessarily performed simultaneously.
  • the forming region 21 of the tube 2 may be heated, and then heating of the forming region 21 of the tube 2 may be stopped to cool the non-forming region 22. Thereafter, cooling of the non-forming region 22 may be stopped and the rod-like roller 3 may be pressed against the forming region 21.
EP16894259.7A 2016-03-14 2016-03-14 Tube diameter expanding method and forming apparatus Active EP3431205B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2016/001438 WO2017158635A1 (ja) 2016-03-14 2016-03-14 管の拡径方法および成形装置

Publications (3)

Publication Number Publication Date
EP3431205A1 EP3431205A1 (en) 2019-01-23
EP3431205A4 EP3431205A4 (en) 2019-08-14
EP3431205B1 true EP3431205B1 (en) 2021-07-14

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EP16894259.7A Active EP3431205B1 (en) 2016-03-14 2016-03-14 Tube diameter expanding method and forming apparatus

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US (1) US20190076903A1 (ja)
EP (1) EP3431205B1 (ja)
JP (1) JP6574518B2 (ja)
CN (1) CN108698110B (ja)
WO (1) WO2017158635A1 (ja)

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CN110871242B (zh) * 2018-08-29 2021-07-30 中国石油天然气集团有限公司 用于承插式钢管承口的制造装置及方法
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JPWO2017158635A1 (ja) 2019-02-14
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CN108698110A (zh) 2018-10-23
US20190076903A1 (en) 2019-03-14

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