US20080016933A1 - Molding method and molding apparatus - Google Patents

Molding method and molding apparatus Download PDF

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Publication number
US20080016933A1
US20080016933A1 US11/789,717 US78971707A US2008016933A1 US 20080016933 A1 US20080016933 A1 US 20080016933A1 US 78971707 A US78971707 A US 78971707A US 2008016933 A1 US2008016933 A1 US 2008016933A1
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United States
Prior art keywords
metal tube
axial core
frame
ring
diameter
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Abandoned
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US11/789,717
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English (en)
Inventor
Katsumi Okamoto
Kazunori Koide
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YUTAKA GIKCN KK
Yutaka Giken Co Ltd
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Yutaka Giken Co Ltd
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Publication date
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Assigned to KABUSHIKI KAISHA YUTAKA GIKCN reassignment KABUSHIKI KAISHA YUTAKA GIKCN ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOIDA, KAZUNORI, OKAMOTO, KATSUMI
Publication of US20080016933A1 publication Critical patent/US20080016933A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/04—Reducing; Closing

Definitions

  • the present invention relates to a method and an apparatus for reducing a diameter in an end portion of a metal tube, and more particularly to a molding method of reducing a diameter in a tapered shape while holding an axial core coinciding with an axial core of a metal tube, or reducing a diameter in the tapered shape while holding the axial core which is eccentric with respect to the axial core of the metal tube, and further reducing a diameter in the tapered shape by inclining the axial core of the reduced diameter portion with respect to the axial core of the metal tube, and a molding apparatus which can achieve the molding method.
  • the spinning molding method is structured such as to reduce a diameter in an end portion of a metal tube by employing a roller which is brought into contact with an outer peripheral surface of the metal tube to be reduced in the diameter, bringing the roller into pressure contact with the outer peripheral surface of the metal tube, and moving the roller close to an axial core of the metal tube as well as relatively moving the metal tube and the roller along the axial core of the metal tube while rotating the metal tube or rotating the roller around the axial core of the metal tube serving as a center of rotation.
  • the eccentric rotational molding method is structured such as to reduce a diameter in an end portion of a metal tube by employing a rotatable conical tool, arranging an axial core of the conical tool in parallel to an axial core of the metal tube so as to bring a conical surface of the conical tool into pressure contact with the end portion of the metal tube, and moving the conical tool in a direction in which the axial core of the conical tool moves close to the axial core of the metal tube along the axial core or in a direction in which the axial core of the conical tool moves away from the axial core of the metal tube in parallel, while rotating the metal tube.
  • the tube is molded so as to reduce the diameter from the end portion by making a center of rotation of a metal mold having a conical hole and being rotatable eccentric from a center axis of the tube, moving the end portion of the tube in a direction of the metal mold along the center axis while bringing the end portion of the tube into pressure contact with the conical hole and rotating the tube.
  • Japanese Patent No. 2548799 it is possible to mold so as to reduce the diameter not only in the end portion of the tube but also over an optional length.
  • the technique described in Japanese Patent No. 2548799 is advantageously employed at a time of molding so as to reduce the diameter in the end portion of the tube, however, there is always a requirement of developing a more rational molding method.
  • the technique in Japanese Patent No. 2548799 there is a risk of generating a problem that a molding load applied to the tube becomes large by enlarging an offset amount between the center of rotation of the metal mold and the center axis of the tube, and the buckling is generated. Accordingly, there is demanded to develop a technique in which a molding speed is fast so as to intend to shorten a working time without generating a buckling.
  • a molding method of reducing a diameter in an end portion of a metal tube including the steps of arranging a plurality of ring-shaped tools arranged with an axial core which is in parallel to an axial core of the metal tube having the end portion to be reduced in the diameter and having an inner periphery brought into contact with an outer periphery of the metal tube, in a radial direction of a frame having an axial core which is in parallel to the axial core of the metal tube, arranging the plurality of ring-shaped tools in such a manner that an axial core of each of the ring-shaped tools is in parallel to the axial core of the metal tube and an inner periphery is brought into contact with the outer periphery of the metal tube or is not brought into contact therewith, and arranging so as to pinch the metal tube, and thereafter rotating the metal tube around the axial core or rotating the frame in which a plurality of ring-shaped tools are
  • the diameter in the end portion of the metal tube in a tapered shape having an axial core coinciding with the axial core of the metal tube by previously bringing the axial core of the metal tube into line with the axial core of the frame. Further, in the case of reducing the diameter in the tapered shape having the axial core which is eccentric from the axial core of the metal tube, it is preferable to previously make the axial core of the metal tube eccentric from the axial core of the frame.
  • the metal tube in the case of reducing the diameter in the end portion of the metal tube in the tapered shape having the axial core which is eccentric with respect to the axial core of the metal tube, it is preferable to rotate the metal tube around the axial core or rotate the frame in which a plurality of ring-shaped tools are arranged, move the metal tube or the frame in a direction in which the ring-shaped tools reach the end portion of the metal tube, and moving the axial core of the ring-shaped tools away from the axial core of the metal tube while moving the axial core of the metal tube away from the axial core of the frame in parallel.
  • a molding method of reducing a diameter in an end portion of a metal tube while inclining at least a partial axial core of the end portion to be reduced in the diameter with respect to an axial core of the metal tube, at a time of reducing the diameter in the end portion of the metal tube including the steps of: arranging a plurality of ring-shaped tools rotating in a state in which an inner periphery is brought into contact with an outer periphery of the metal tube, in a radial direction of a frame and structuring an axial core of the frame and the axial core of the metal tube in such a manner as to be relatively changeable, setting the axial core of the frame to a previously set angle with respect to the axial core of the metal tube and arranging the plurality of ring-shaped tools in such a manner that the inner periphery of each of the ring-shaped tools is brought into contact with the outer periphery of the metal tube or is not brought into
  • the diameter in the end portion of the metal tube in a tapered shape having an axial core inclined with respect to the axial core of the metal tube by previously bringing the axial core of the metal tube into line with the axial core of the frame, and relatively moving the axial core of the frame and the axial core of the metal tube in parallel in the process of moving the metal tube or the frame as well as rotating the metal tube around the axial core or rotating the frame in which a plurality of ring-shaped tools are arranged.
  • the diameter in the end portion of the metal tube in a tapered shape having an axial core inclined with respect to the axial core of the metal tube by previously inclining the axial core of the metal tube and the axial core of the frame relatively, and maintaining the incline between the axial core of the metal tube and the axial core of the frame in the process of moving the metal tube or the frame as well as rotating the metal tube around the axial core or rotating the frame in which a plurality of ring-shaped tools are arranged.
  • the diameter in the end portion of the metal tube in a tapered shape having an axial core inclined with respect to the axial core of the metal tube by setting the axial core of the metal tube and the axial core of the frame to a previously set angle, and relatively changing the angle between the axial core of the metal tube and the axial core of the frame together with the movement of the metal tube or the frame, in the process of moving the metal tube or the frame as well as rotating the metal tube around the axial core or rotating the frame in which a plurality of ring-shaped tools are arranged.
  • a molding apparatus for reducing a diameter in an end portion of a metal tube including a plurality of ring-shaped tools rotating in a state in which an inner periphery is brought into contact with an outer periphery of the metal tube, a frame arranging and holding the plurality of ring-shaped tools in a radial direction, a tool moving member provided in the frame and moving the individual ring-shaped tool within a surface which is orthogonal to an axial core of each of the ring-shaped tools, a drive member rotating the frame, a grip member arranged so as to face to the frame and gripping the metal tube to be reduced in diameter in the end portion, and a supply car mounting the grip member and structured such as to be movable in a direction of moving the grip member close to or away from the frame, and an orthogonal direction to the direction.
  • a revolving member provided in the frame or the grip member arranged so as to face to the frame and relatively changing the angle formed by the axial cores.
  • a plurality of ring-shaped tools held by the frame are arranged at a uniform angle around the axial core of the frame, and it is further preferable that they are arranged at positions facing at 180 degree.
  • the structure is made such as to arrange a plurality of ring-shaped tools in the outer periphery of the metal tube to be reduced in diameter and make the axial core of the ring-shaped tool eccentric with respect to the axial core of the metal tube, it is possible to execute a rational eccentric rotational molding with respect to the metal tube by the individual ring-shaped tools.
  • the eccentric rotational molding method can enlarge the molding load in comparison with the spinning molding method, the eccentric rotational molding method has a feature capable of making the molding speed faster.
  • the structure is made such as to arrange a plurality of ring-shaped tools in the outer periphery of the metal tube to be reduced in diameter and make the axial core of the ring-shaped tool eccentric with respect to the axial core of the metal tube, it is possible to execute a rational eccentric rotational molding with respect to the metal tube by the individual ring-shaped tools.
  • the eccentric rotational molding method can enlarge the molding load in comparison with the spinning molding method, the eccentric rotational molding method has a feature capable of making the molding speed faster.
  • the structure is made such as to attach a plurality of ring-shaped tools to the frame and make the axial core of the frame and the axial core of the metal tube relatively changeable, it is possible to set the axial core of the frame to a desired angle with respect to the axial core of the metal tube. Accordingly, it is possible to reduce the diameter in the end portion of the metal tube in the tapered shape having the axial core inclined at the desired angel with respect to the axial core of the metal tube, by setting the axial core of the frame to the previously set angle with respect to the axial core of the metal tube, and molding in this state.
  • the axial core of the reduced diameter portion obtained by reducing the diameter in the end portion of the metal tube is inclined with respect to the axial core of the metal tube.
  • the molding apparatus in accordance with the present invention can preferably execute the molding method mentioned above, and can reduce the diameter in the end portion of the metal tube in the desired shape.
  • the molding method or the molding apparatus in accordance with the present invention is advantageously executed at a time of working an exhaust gas converter of a motor vehicle, and particularly includes a terminal diameter reducing work of a position to which the flange is attached for connecting the exhaust gas converter and an exhaust gas silencer, at a time of working the exhaust gas converter.
  • the molding method or the molding apparatus in accordance with the present invention is advantageous at a time of working the exhaust gas converter of the motor vehicle.
  • FIG. 1 is a side elevational view schematically explaining a structure of a molding apparatus.
  • FIG. 2 is a plan view schematically explaining the structure of the molding apparatus.
  • FIG. 3 is a view explaining a structure of a ring-shaped tool.
  • FIGS. 4A and 4B are views explaining a principle of a molding method in accordance with the present invention.
  • FIGS. 5A and 5B are views explaining a shape of a reduced diameter portion in which a diameter is reduced in accordance with a first molding method of the present invention.
  • FIGS. 6A to 6 C are views explaining a shape of a reduced diameter portion in which a diameter is reduced in accordance with a second molding method of the present invention.
  • FIG. 1 is a side elevational view schematically explaining a structure of a molding apparatus.
  • FIG. 2 is a plan view schematically explaining the structure of the molding apparatus.
  • FIG. 3 is a view explaining a structure of a ring-shaped tool.
  • FIGS. 4A and 4B are views explaining a principle of a molding method in accordance with the present invention.
  • FIGS. 5A and 5B are views explaining a shape of a reduced diameter portion in the case that an axial core of a metal tube and an axial core of the reduced diameter portion are inclined.
  • FIGS. 6A to 6 C are reference views explaining a procedure of reducing a diameter in an end portion of the metal tube.
  • the molding method in accordance with the present invention is structured such as to arrange a plurality of ring-shaped tools rotatably structured in such a manner as to be brought into contact with the metal tube while pinching an outer periphery of the metal tube to be reduced in diameter, and press the outer periphery of the metal tube by an inner periphery of the individual ring-shaped tool by moving the metal tube and the ring-shaped tools along an axial core (which is inclined at a previously set angle with respect to the axial core of the metal tube) of the reduced diameter portion as well as moving the axial core of the ring-shaped tool away from the axial core of the metal tube, while relatively rotating the metal tube and the ring-shaped tools, thereby reducing the diameter of the metal tube.
  • an inner periphery of a ring-shaped tool 2 structured rotatable (rotatable on its own axis) around an axial core 2 a serving as a center is brought into contact with an outer periphery of a metal tube to be reduced in diameter.
  • a distance between the axial core 2 a of the ring-shaped tool 2 and an axial core 1 a of the metal tube is OF-A shown in FIG. 4A .
  • a circle 3 having a diameter ⁇ D is formed by a circular arc of the ring-shaped tool 2 , as shown in the same drawing, however, the circle 3 is identical to an outer diameter of the metal tube 1 , and the diameter reduction of the metal tube is not executed in this state.
  • the distance of the axial core 2 a of the ring-shaped tool 2 from the axial core 1 a of the metal tube is changed to OF-B which is larger than OF-A, and if the ring-shaped tool 2 is rotated around the axial core 1 a in this state, a circle 4 having a smaller diameter ⁇ d than the diameter (D is formed by the circular arc of the ring-shaped tool 2 , as shown in the same drawing.
  • a changing amount of the ring-shaped tool 2 comes to a molding load applied to the metal tube, and an outer diameter of the metal tube is reduced in diameter from ⁇ D to ⁇ d.
  • the diameter reduction molding is simultaneously executed with respect to the metal tube by two ring-shaped tools 2 . Accordingly, it is possible to set a magnitude of the molding load applied to the individual ring-shaped tool 2 to a suitable value, it is possible to achieve a secure molding by one step. In other words, it is possible to improve a working rate by applying the same molding load to each of the ring-shaped tools 2 , and it is possible to set the molding load in such a manner that a coarse molding is executed by the preceding ring-shaped tool 2 and a finish molding is executed by the subsequent ring-shaped tool 2 .
  • the diameter ⁇ D of the circle 3 comes to twice as much as a value obtained by subtracting the distance OF-A between the axial core 1 a and the axial core 2 a from a radius of the ring-shaped tool 2 .
  • the diameter ⁇ d of the circle 4 comes to twice as much as a value obtained by subtracting the distance OF-B between the axial core 1 a and the axial core 2 a from the radius of the ring-shaped tool 2 .
  • a speed which moves the axial core 2 a of the ring-shaped tool 2 away from the axial core 1 a of the metal tube can be appropriately set in correspondence to a condition such as a material, a thickness or the like of the metal tube, and can not be definitely set.
  • the number of the ring-shaped tool is not particularly limited, but it is preferable that at least two ring-shaped tools are provided.
  • the pressing positions of the ring-shaped tools 2 to the metal tube face to each other by arranging two ring-shaped tools 2 on a diameter centering on the axial core 1 a of the metal tube (at positions facing at 180 degree). Accordingly, it is possible to prevent the buckling which may be generated in the metal tube so as to apply a greater molding load. This case is advantageously employed at a time of molding with respect to the metal tube in which the thickness is thin and the risk that the buckling is generated is high.
  • the moving directions of the respective ring-shaped tools it is preferable to set the moving directions of the respective ring-shaped tools to an equal angle within a surface orthogonal to the axial core 1 a of the metal tube, and set such that the applying methods of the molding loads are balanced at a time of executing the molding work with respect to the metal tube.
  • the total of the molding loads applied to the metal tube becomes large at a degree that the number of the ring-shaped tool is increased. Accordingly, this structure is advantageously employed in a case of molding a thick metal tube.
  • the inner periphery of the ring-shaped tool is brought into contact with the outer periphery of the metal tube to be reduced in diameter, it is necessary that the inner diameter is larger than the outer diameter of the metal tube. Further, since it is necessary that the ring-shaped tool is brought into contact with the outer periphery of the metal tube so as to rotate on its own axis, it is preferable to form a whole of the ring-shaped tool as a rolling bearing structure.
  • the metal tube is rotated or a plurality of ring-shaped tools 2 are rotated, at a time of molding the metal tube. Whichever may be rotated, no special problem is generated. Particularly, in the case that a plurality of ring-shaped tools are rotated, there is generated a risk that a dynamic balance is not secured, however, in this case, since the rotating speed at a time of rotating is not large, there is not generated any problem.
  • the molding apparatus A shown in the drawing is structured such that a diameter reduction can be executed at an axial core inclined with respect to the axial core 1 a of the metal tube 1 in the end portion of the metal tube 1 , by gripping the metal tube 1 to be reduced in diameter in the end portion, arranging two ring-shaped tools 11 and 12 in the outer periphery of the end portion of the metal tube 1 , and moving the ring-shaped tools 11 and 12 in a direction crossing to the axial core 1 a as well as moving the metal tube 1 in a direction moving the metal tube 1 away from or close to the ring-shaped tools 11 and 12 , while rotating the ring-shaped tools 11 and 12 .
  • the molding apparatus A has a supply car 22 mounted to a pair of rails 21 , and the supply car 22 is structured such as to be driven by a supply car driving apparatus 23 constituted by a servo motor 23 a and a ball spline 23 b so as to be movable in directions of arrows a and b along an installing direction of the rail 21 . Accordingly, it is possible to move the supply car 22 at a desired speed in the direction of the arrow a or the direction of the arrow b along the rail 21 , by driving the servo motor 23 a.
  • a carriage 26 mounting a chuck 25 forming a grip member detachably gripping the metal tube 1 is arranged in the supply car 22 , and the carriage 26 is driven by a carriage driving apparatus 27 constituted by a servo motor 27 a and a ball spline 27 b so as to be movable in directions of arrows c and d corresponding to a direction orthogonal to the installing direction of the rail 21 and a direction moving close to or away from the ring-shaped tools 11 and 12 (a frame 31 mentioned below). Accordingly, it is possible to move the carriage 26 at a desired speed in the direction of the arrow c or the direction of the arrow d corresponding to the orthogonal direction to the rail 21 , by driving the servo motor 27 a.
  • the chuck 25 detachably gripping the metal tube 1 is mounted via a rotating table 28 serving as a revolving member provided in the carriage 26 constructing the supply car 22 .
  • the structure of the rotating table 28 is not particularly limited, but may be formed as a general structure which has a driving means (not shown) and is used as a rotating tool.
  • the chuck 25 is fixed to a center of rotation of the rotating table 28 , and is structured such as to freely revolve in directions of arrows e and f in accordance with the rotation of the rotating table 28 . Accordingly, it is possible to revolve the chuck 25 at a desired speed in the direction of the arrow e or the direction of the arrow f around the center of rotation by driving the driving means (not shown).
  • Two ring-shaped tools 11 and 12 are arranged so as to face at 180 degree on a straight line 31 b passing through a center 31 a of a ring-shaped frame 31 , as shown in FIG. 3 , and are attached to a rod 32 a of a hydraulic cylinder 32 forming a tool moving member attached to the frame 31 .
  • a pair of guide bars 33 are provided in an inner peripheral surface of the frame 31 in parallel to the straight line 31 b of the frame 31 in correspondence to the respective ring-shaped tools 11 and 12 .
  • each of the ring-shaped tools 11 and 12 is guided by the corresponding guide bar 33 , whereby each of the axial cores 11 a and 12 a can accurately move on the straight line 31 b with respect to the center 31 a of the frame 31 (the axial core of the frame 31 ).
  • the guide bar 33 has a function of countering a thrust load applied to each of the ring-shaped tools 11 and 12 at a time of molding with respect to the metal tube 1 , in addition to a function of guiding the moving direction of each of the ring-shaped tools 11 and 12 .
  • the ring-shaped tools 11 and 12 have a function of transmitting the molding load applied from the hydraulic cylinder 32 as well as being brought into contact with the outer periphery of the metal tube 1 , and have molding rings 11 b and 12 b structured such as to rotate on its own axis on the basis of a contact friction with the metal tube 1 .
  • the inner surfaces of the molding rings 11 b and 12 b may be formed in a tapered shape, however, in this case, there is a risk that a general-purpose property of a working condition including a taper angle formed in the metal tube 1 is deteriorated.
  • the present embodiment is structured such that the molding can be executed by forming rims 11 c and 12 c in which end portions in one side are protruded, and bringing the rims 11 c and 12 c into pressure contact with the outer periphery of the metal tube 1 .
  • the rims 11 c and 12 c formed in the molding rings 11 b and 12 b of the ring-shaped tools 11 and 12 are arranged in such a manner as to be capable of being adjacent to each other, and the structure is made such as to be capable of simultaneously molding extremely close positions of the metal tube 1 by the respective rims 11 c and 12 c . Since the ring-shaped tools 11 and 12 are structured as mentioned above, it is possible to apply the molding load to the metal tube 1 approximately on the straight line 31 b , and it is possible to prevent the bucking from being generated.
  • Each of the molding rings 11 b and 12 b is rotatably supported to the bearing member 13 attached to the rod 32 a of the hydraulic cylinder 32 , thereby being structured such as to freely rotate on its own axis.
  • a ring-shaped case 13 a is attached to the rod 32 a of the hydraulic cylinder 32
  • a bearing 13 b is arranged in the case 13 a
  • the molding bearings 11 b and 12 b are pressure inserted to an inner ring of the bearing 13 b .
  • a fitting portion 13 c fitted to the guide bar 33 is formed at a predetermined position on an outer periphery of the case 13 , and the fitting portion 13 c is fitted to the guide bar 33 , whereby it is possible to move each of the ring-shaped tools 11 and 12 along the straight line 31 b in accordance with the drive of the hydraulic cylinder 32 .
  • flanges 11 d and 12 d are respectively provided in the molding rings 11 b and 12 b , and the structure is made such as to transmit the thrust load applied to the molding rings 11 b and 12 b to the bearing member 13 via the flanges 11 d and 12 d at a time of molding with respect to the metal tube 1 . Accordingly, the thrust load generated at a time of reducing the diameter of the metal tube 1 by each of the ring-shaped tools 11 and 12 , is transmitted to the frame 31 from the molding rings 11 b and 12 b via the fitting portion 13 c of the bearing member 13 , and the guide member 33 .
  • the frame 31 attaching the ring-shaped tools 11 and 12 thereto is fixed to one end portion of a spindle 36 rotatably supported with respect to a bridge groove 35 .
  • a pulley 37 a is fixed to the other end portion side of the spindle 36 , and a belt 37 d is wound between the pulley 37 a and a pulley 37 c fixed to a driving mechanism 37 b including a motor, a variable speed gear and a speed reduction gear. Accordingly, it is possible to rotate the frame 31 at a desired rotating speed, by driving the driving mechanism 37 b.
  • the present embodiment utilizes the hydraulic cylinder 32 at a time of moving the ring-shaped tools 11 and 12 along the straight line 31 b of the frame 31 , however, it is not necessary to limit to the hydraulic cylinder, but it is possible to employ any structure as far as the structure can achieve a reciprocating linear motion as well as transmitting the molding load necessary for reducing the diameter of the metal tube 1 to each of the ring-shaped tools 11 and 12 .
  • the molding apparatus A structured as mentioned above, it is possible to incline the axial core 1 a of the metal tube 1 gripped to the chuck 25 with respect to the axial core 31 a of the frame 31 by synchronously actuating the supply car driving apparatus 23 , the carriage driving apparatus 27 and the rotating table 28 , thereby revolving the chuck 25 , and it is possible to bring an intersecting point between the axial cores 1 a and 31 a into line with the straight line 31 b formed in the frame 31 . Further, it is possible to move the metal tube 1 inclined with respect to the axial core 31 a of the frame 31 along the axial core 1 a , while executing the diameter reducing work with respect to the metal tube 1 .
  • the structure is made such that the rotating table 28 is provided in the chuck 25 , and the angle of the chuck 25 is changed by the rotating table 28
  • the structure is not limited to this structure, but the structure may be made such that the rotating table is provided in the frame 31 and the axial core 31 a of the frame 31 is inclined with respect to the axial core 1 a of the metal tube 1 .
  • the molding method corresponds to a basic procedure at a time of reducing the diameter in the end portion of the metal tube 1 , and makes it possible to easily understand the embodiment mentioned below.
  • the supply car 22 is moved in the direction of the arrow a or the direction of the arrow b by driving the supply car driving apparatus 23 , and the axial core of the chuck 25 (the axial core 1 a of the metal tube 1 ) is brought into line with the axial core 31 a of the frame 31 .
  • the axial core of the chuck 25 is brought into line with the axial core 31 a of the frame 31 by driving the rotating table 28 .
  • the axial cores 11 a and 12 a of the respective ring-shaped tools 11 and 12 are moved so as to be approximately brought into line with the axial core 31 a of the frame 31 , by driving the hydraulic cylinder 32 attached to the frame 31 .
  • the movement is executed for the purpose of passing the metal tube 1 through the rims 11 c and 12 c provided in the molding rings 11 b and 12 b of the respective ring-shaped tools 11 and 12 .
  • the end portion of the metal tube 1 is passed through each of the ring-shaped tools 11 and 12 by gripping the metal tube 1 to be reduced in diameter by the chuck 25 , and driving the carriage driving apparatus 27 .
  • a length of the end portion of the metal tube 1 passed through each of the ring-shaped tools 11 and 12 is equal to a previously set length of the end portion to be reduced in diameter.
  • the rims 11 c and 12 c of the respective ring-shaped tools 11 and 12 are brought into contact with the outer periphery of the metal tube 1 by driving the hydraulic cylinder 32 . A preparation for executing the diameter reduction is finished in this state.
  • the frame 31 is rotated at a previously set rotating speed by driving the driving mechanism 37 c .
  • Two hydraulic cylinders 32 are simultaneously driven in accordance with the rotation start of the frame 31 , and the axial cores 11 a and 12 a of the respective ring-shaped tools 11 and 12 are moved in such a manner as to move away from the axial core 1 a of the metal tube 1 . Since the rims 11 c and 12 c apply the molding load to the outer periphery of the metal tube 1 in accordance with this movement, the end portion of the metal tube 1 is reduced in diameter. It is possible to reduce the diameter in the end portion of the metal tube 1 , by driving the carriage driving apparatus 27 in correspondence to the start of the diameter reduction, and moving the metal tube 1 in the direction of the arrow c or the direction of the arrow d.
  • the axial core 1 a of the metal tube 1 and the axial core 31 a of the frame 31 are held in a state of being brought into line with each other. Accordingly, the axial core of the reduced diameter portion is in line with the axial core 1 a of the metal tube 1 . Further, it is possible to set the taper angle in the end portion of the metal tube 1 by controlling a moving speed of each of the ring-shaped tools 11 and 12 along the guide bar 33 by means of the hydraulic cylinder 32 , and a moving speed in the direction of the arrows c and d of the metal tube 1 by means of the carriage driving apparatus 27 .
  • the axial core 1 a of the metal tube 1 is made eccentric at a previously set amount of eccentricity ⁇ from the center 31 a of the frame 31 , by driving the supply car driving apparatus 23 . Further, each of the ring-shaped tools 11 and 12 is moved by driving the hydraulic cylinder 32 .
  • the axial cores 11 a and 12 a of the respective ring-shaped tools 11 and 12 are moved in such a manner as to be moved away from the center 31 a of the frame 31 , by gripping the metal tube 1 by the chuck 25 so as to pass the end portion through each of the ring-shaped tools 11 and 12 , thereafter rotating the frame 31 in the same manner as the embodiment 3 mentioned above, and simultaneously driving two hydraulic cylinders 32 .
  • the rims 11 c and 12 c can be brought into pressure contact with the outer periphery of the metal tube 1 so as to reduce the diameter in accordance with the movement.
  • the axial core of the chuck 25 (the axial core 1 a of the metal tube 1 ) is brought into line with the axial core 31 a of the frame 31 by driving the supply car driving apparatus 23 and the rotating table 28 . Further, each of the ring-shaped tools 11 and 12 is moved so as to be capable of accommodating the metal tube 1 by driving the hydraulic cylinder 32 .
  • the end portion is passed through each of the ring-shaped tools 11 and 12 by gripping the metal tube 1 by the chuck 25 .
  • the axial core 1 a of the metal tube 1 and the axial core 31 a of the frame 31 are in line with each other.
  • the axial cores 11 a and 12 a of the respective ring-shaped tools 11 and 12 are moved in such a manner as to be moved away from the axial core 31 a of the frame 31 , by rotating the frame 31 , and simultaneously driving two hydraulic cylinders 32 .
  • the rims 11 c and 12 c are brought into pressure contact with the outer periphery of the metal tube 1 in accordance with the movement, and the diameter reduction is started.
  • the metal tube 1 is moved in the direction of the arrow c or the direction of the arrow d by driving the carriage driving apparatus 27 in accordance with the start of the diameter reduction with respect to the end portion of the metal tube 1 caused by each of the ring-shaped tools 11 and 12 , and the drive of the supply car driving apparatus 23 is simultaneously started.
  • a moving length of the carriage 26 in the direction of the arrow c or the direction of the arrow d is set to be equal to the previously set length of the reduced diameter portion in the end portion of the metal tube 1 . It is possible to pass the center 31 a (the straight line 31 b ) of the frame 31 through a locus on a line ⁇ shown in FIG.
  • a boundary line between the metal tube 1 and the reduced diameter portion is formed within a surface which is approximately vertical to the axial core 1 a of the metal tube 1 .
  • an angle of incline of the axial core 1 a of the metal tube 1 gripped to the chuck 25 with respect to the axial core 31 a of the frame 31 is set to ⁇ b by rotating the rotating table 28 , for example, in a direction of an arrow e.
  • the carrier car 22 is moved, for example, in the direction of the arrow b, in such a manner that the axial core 1 a of the metal tube 1 gripped to the chuck 25 is in line with the center 31 a (the straight line 31 b ) of the frame 31 , by driving the supply car driving apparatus 23 .
  • each of the ring-shaped tools 11 and 12 is moved so as to be capable of accommodating the metal tube 1 inclined at the angle ⁇ b by driving the hydraulic cylinder 32 .
  • the end portion is passed through each of the ring-shaped tools 11 and 12 by gripping the metal tube 1 by the chuck 25 , thereafter, the axial cores 11 a and 12 a of the respective ring-shaped tools 11 and 12 are moved in such a manner as to be moved away from the axial core 31 a of the frame 31 , by rotating the frame 31 , and simultaneously driving two hydraulic cylinders 32 , in the same manner as the embodiment 3 mentioned above.
  • the rims 11 c and 12 c are brought into pressure contact with the outer periphery of the metal tube 1 in accordance with the movement, and the diameter reduction is started.
  • the axial core of the chuck 25 (the axial core 1 a of the metal tube 1 ) is brought into line with the axial core 31 a of the frame 31 by driving the supply car driving apparatus 23 and the rotating table 28 . Further, each of the ring-shaped tools 11 and 12 is moved in such a manner as to accommodate the metal tube 1 by driving the hydraulic cylinder 32 .
  • the end portion is passed through each of the ring-shaped tools 11 and 12 by making the chuck 25 grip the metal tube 1 .
  • the axial cores 11 a and 12 a of the respective ring-shaped tools 11 and 12 are moved in such a manner as to be moved away from the axial core 31 a of the frame 31 by rotating the frame 31 and simultaneously driving two hydraulic cylinders 32 .
  • the rims 11 c and 12 c are brought into pressure contact with the outer periphery of the metal tube 1 in accordance with the movement, and the diameter reduction is started.
  • the moving distance in the direction of the arrow d of the metal tube 1 by means of the carriage driving apparatus 27 , the angle of rotation of the rotating table 28 , and the moving distance in the direction of the arrow b of the supply car 22 by means of the supply car driving apparatus 23 respectively reach the previously set times and the previously set values, it is possible to mold the diameter reduced portion having the axial core 1 b which is inclined continuously to the angle ⁇ c from the original coinciding state with the axial core 1 a in the end portion of the metal tube 1 .
  • the boundary line between the metal tube 1 and the diameter reduced portion is formed within the surface which is approximately vertical to the axial core 1 a of the metal tube 1 .
  • the molding method of the present invention it is possible to rationally reduce the diameter in the end portion of the metal tube to be reduced in diameter by applying the eccentric rotational molding method, and it is possible to preferably utilize the molding method of the present invention as a manufacturing means of a seamless diameter reduced portion in a piping distributing a fluid, in the manufacturing means of the exhaust gas converter.
  • the molding apparatus in accordance with the present invention can rationally execute the molding method in accordance with the present invention, can prevent the buckling which may be generated in the metal tube to be molded, and can preferably reduce the diameter by one step, the molding apparatus in accordance with the present invention can be preferably utilized in a factory reducing the diameter of the metal tube or the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US11/789,717 2006-05-18 2007-04-25 Molding method and molding apparatus Abandoned US20080016933A1 (en)

Applications Claiming Priority (2)

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JPJP2006-138793 2006-05-18
JP2006138793A JP4822928B2 (ja) 2006-05-18 2006-05-18 成形方法及び成形装置

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Cited By (1)

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JP2015229188A (ja) * 2014-06-06 2015-12-21 カナエ工業株式会社 偏心拡管の製造方法

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Publication number Priority date Publication date Assignee Title
WO2013097272A1 (zh) * 2011-12-30 2013-07-04 Hu Delin 一种储液器及其加工装置和方法

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US3486357A (en) * 1968-06-21 1969-12-30 Universal Metal Hose Co Annular corrugating apparatus for tubing
US3796078A (en) * 1972-10-30 1974-03-12 Torrington Co Apparatus for making spiral corrugations
US4061009A (en) * 1976-11-10 1977-12-06 Kaporovich Vladimir Georgievic Machine for spinning tubular workpieces
US6216512B1 (en) * 1993-11-16 2001-04-17 Sango Co., Ltd. Method and apparatus for forming a processed portion of a workpiece
US6666062B2 (en) * 2000-07-17 2003-12-23 Victaulic Company Of America Pipe preparation device
US20050144998A1 (en) * 2002-01-17 2005-07-07 Johan Massee Method and forming machine for manufacturing a product having various diameters
US6990841B2 (en) * 2003-10-17 2006-01-31 Delphi Technologies, Inc. Method and apparatus for lean spin forming transition portions having various shapes
US7131305B2 (en) * 2003-10-17 2006-11-07 Delphi Technologies, Inc. Method and apparatus for lean spin forming

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JPS6127109A (ja) * 1984-07-18 1986-02-06 Nippon Steel Corp 長柱体成形装置
JP2957154B2 (ja) * 1997-11-18 1999-10-04 株式会社三五 管端の成形方法とその装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3486357A (en) * 1968-06-21 1969-12-30 Universal Metal Hose Co Annular corrugating apparatus for tubing
US3796078A (en) * 1972-10-30 1974-03-12 Torrington Co Apparatus for making spiral corrugations
US4061009A (en) * 1976-11-10 1977-12-06 Kaporovich Vladimir Georgievic Machine for spinning tubular workpieces
US6216512B1 (en) * 1993-11-16 2001-04-17 Sango Co., Ltd. Method and apparatus for forming a processed portion of a workpiece
US6666062B2 (en) * 2000-07-17 2003-12-23 Victaulic Company Of America Pipe preparation device
US20050144998A1 (en) * 2002-01-17 2005-07-07 Johan Massee Method and forming machine for manufacturing a product having various diameters
US6990841B2 (en) * 2003-10-17 2006-01-31 Delphi Technologies, Inc. Method and apparatus for lean spin forming transition portions having various shapes
US7131305B2 (en) * 2003-10-17 2006-11-07 Delphi Technologies, Inc. Method and apparatus for lean spin forming

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015229188A (ja) * 2014-06-06 2015-12-21 カナエ工業株式会社 偏心拡管の製造方法

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JP4822928B2 (ja) 2011-11-24

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