EP1025923A1 - Procede de production d'un conteneur a structure double - Google Patents

Procede de production d'un conteneur a structure double Download PDF

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Publication number
EP1025923A1
EP1025923A1 EP99944778A EP99944778A EP1025923A1 EP 1025923 A1 EP1025923 A1 EP 1025923A1 EP 99944778 A EP99944778 A EP 99944778A EP 99944778 A EP99944778 A EP 99944778A EP 1025923 A1 EP1025923 A1 EP 1025923A1
Authority
EP
European Patent Office
Prior art keywords
tube
workpiece
axis
spinning
double
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.)
Withdrawn
Application number
EP99944778A
Other languages
German (de)
English (en)
Inventor
Tohru Yawatayama Kojo Sango Co. Ltd. IRIE
Masashi Yawatayama Kojo Sango Co. Ltd. OTA
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.)
Sango Co Ltd
Original Assignee
Sango Co Ltd
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 Sango Co Ltd filed Critical Sango Co Ltd
Publication of EP1025923A1 publication Critical patent/EP1025923A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1872—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14—Spinning
    • B21D22/18—Spinning using tools guided to produce the required profile
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • F01N3/2842—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration specially adapted for monolithic supports, e.g. of honeycomb type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • F01N3/2885—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices with exhaust silencers in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/26—Tubes being formed by extrusion, drawing or rolling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/15—Plurality of resonance or dead chambers
    • F01N2490/155—Plurality of resonance or dead chambers being disposed one after the other in flow direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/20—Chambers being formed inside the exhaust pipe without enlargement of the cross section of the pipe, e.g. resonance chambers

Definitions

  • This invention relates to a method of producing a double-walled container, and more particularly to a production method in which a double-walled container is obtained by changing the cross-sectional shapes of inner and outer tubes simultaneously.
  • a heat-insulating tube structure in which an inner tube of an integral construction, continuously varying axially a cross-sectional shape, and an outer tube of an integral construction, decreasing in diameter in a tapering manner at its opposite ends, are arranged in concentric relation to each other, with a space formed therebetween.
  • an inner tube 104 of metal which contains a catalyst carrier 101 therein, and has tapering diameter-decreasing portions 102 and 103 formed respectively at opposite ends thereof, with an outer tube 107 of metal, having tapering diameter-decreasing portions 105 and 106 formed respectively at opposite ends thereof, so that a space 108 is formed between the inner tube 104 and the outer tube 105, as shown in Fig. 15.
  • This construction is disclosed, for example, in JP-A-6-101465.
  • One method of producing the catalytic converter is to apply a diameter-decreasing processing to the outer tube 107 held around the inner tube 104, beforehand subjected to a diameter-decreasing processing, with the predetermined space 108 formed therebetween. With this method, however, the production is difficult, and besides the production cost is high.
  • thermos bottle There is known a method of producing a thermos bottle, in which an inner tube, which is open only at one end thereof, and an outer tube, which is open only at one end thereof, are separately formed respectively into desired cross-sections by spinning processing, and these tubes are combined together. This is disclosed, for example, in JP-A-10-15631 and JP-A-7-284452.
  • a production method of a first aspect of the invention is characterized in that an inner tube is arranged in an outer tube, with a space formed therebetween; a solid interposition material is held between the tubes at least in one region of said space extending in a direction of a tube axis; and in this condition, a spinning processing is applied to said outer tube, thereby changing cross-sections of said inner and outer tubes simultaneously.
  • the inner and outer tubes, holding the solid interposition material therebetween are rotated about the tube axis, and spinning rollers are pressed against the outer tube to effect the spinning processing, so that the cross-section of the outer tube is changed by its pressing force, and further the pressing force is transmitted from the outer tube to the inner tube through the deformable solid interposition material, held in the space, so that the cross-section of the inner tube is changed simultaneously. Therefore, one end portions of the inner and outer tubes can be simultaneously formed into a desired shape with one spinning step.
  • the inner and outer tubes are held stationary, and the spinning rollers are revolved, so as to press the spinning rollers against the outer tube, thereby effecting the spinning processing.
  • the revolving spinning rollers are pressed against the stationary outer tube to effect the spinning processing, so that the cross-section of the outer tube is changed by its pressing force, and further the pressing force is transmitted from the outer tube to the inner tube through the deformable solid interposition material, held in the space, so that the cross-section of the inner tube can be changed simultaneously.
  • one end portions of the inner and outer tubes can be simultaneously formed into a desired shape with one spinning step.
  • a production method of a second aspect of the invention is characterized in that an inner tube is arranged in an outer tube, with a space formed therebetween; a solid interposition material is held between the tubes at least in one region of the space extending in a direction of a tube axis; and in this condition, spinning rollers are revolved to apply a spinning processing to the outer tube, thereby simultaneously changing cross-sections of the inner and outer tubes in eccentric relation to a tube axis of a workpiece of the inner and outer tubes.
  • one end portions of the inner and outer tubes, changed in eccentric relation to the tube axis of the workpiece, can be formed simultaneously with one spinning step.
  • a production method of a third aspect of the invention is characterized in that an inner tube is arranged in an outer tube, with a space formed therebetween; a solid interposition material is held between the tubes at least in one region of said space extending in a direction of a tube axis; a tube axis of a workpiece of said inner and outer tubes is inclined with respect to an axis of spinning rollers, and said spinning rollers are revolved to apply a spinning processing to said outer tube, thereby changing cross-sections of said inner and outer tubes in slantingly-bending relation to the tube axis of the workpiece of said inner and outer tubes.
  • one end portions of the inner and outer tubes, changed in bending relation to the tube axis of the workpiece, can be formed with one spinning step.
  • a mandrel may be inserted into at least one of the inner and outer tubes at least at one region thereof.
  • the mandrel is inserted between the inner and outer tubes or in the inner tube, and therefore excessive deformation of the inner and outer tubes during the spinning operation can be prevented.
  • the solid interposition material may be one of hot-melt resin , thermoplastic resin and molten salt in a solidified condition.
  • this solid interposition material By heating this solid interposition material so as to soften and molt it, the charging of the solid interposition material into the space before the shaping of the inner and outer tubes, as well as the removal of the solid interposition material to the outside of the space after the shaping, can be easily effected.
  • Fig. 1 is a partly-broken, side-elevational view of a spinning machine
  • Fig. 2 is a partly-broken, plan view of the spinning machine of Fig. 1.
  • a workpiece drive portion 2 is mounted on one side portion of a fixed base 1
  • a roller drive portion 3 is mounted on the other side portion thereof.
  • Two parallel X-direction slide rails 5 are fixedly mounted on a side of the base 1, on which the workpiece drive portion 2 is mounted, and extend in a direction (referred to as "X direction") parallel to an axis X5 of revolution of rollers 28 (described later).
  • An X-direction slider 6 is mounted on the X-direction slide rails 5 for sliding movement in the X-direction, and a ball spline shaft 8 is threadedly engaged with a boss 7 formed on the X-direction slider 6.
  • the X-direction slider 6 can be moved forward and backward in the X-direction in a desired distance by rotating the ball spline shaft 8 in normal and reverse directions in a desired amount by drive means 9 such as a motor.
  • Two parallel Y-direction slide rails 10 are fixedly mounted on the X-direction slider 6, and extend in a horizontal direction (referred to as "Y-direction") perpendicular to the X-direction.
  • a Y-direction slider 11 is mounted on the Y-direction slide rails 10 for sliding movement in the Y-direction.
  • a bed 30 is fixedly mounted on the Y-direction slider 11, and a ball spline shaft 15 is threadedly engaged with a boss 14 fixedly mounted on a lower surface of the bed 30.
  • the bed 30 can be moved forward and backward in the Y-direction in a desired distance by rotating the ball spline shaft 15 in normal and reverse directions in a desired amount by drive means 16 such as a motor.
  • Angular-movement drive means 31 such as a motor is mounted on the bed 30, and an angular-movement drive shaft 31a of this angular-movement drive means 31 projects vertically from the upper surface of the bed 30.
  • the angular-movement drive means 31 and the angular-movement drive shaft 31a jointly form means for inclining a workpiece 4.
  • a lower clamp 13, constituting a clamp device 12, is slidably mounted on the upper surface of the bed 30, and the drive shaft 31a is fixed to the lower clamp 13, and when the angular-movement drive shaft 31a is rotated in normal and reverses directions, the lower clamp 13 is angularly moved about the angular-movement drive shaft 31a in normal and reverse directions in a horizontal plane.
  • the angular-movement drive shaft 31a is disposed such that its axis perpendicularly intersects a tube axis X4 of the workpiece 4 placed on the lower clamp 13 (described later), as shown in Fig. 2.
  • a clamp surface 13a of a semi-circular shape for supporting a lower half surface of the workpiece 4 is formed on the upper surface of the lower clamp 13 in such a manner that when the workpiece 4 is placed on this clamp surface, the tube axis X4 of the workpiece 4 is disposed at the same level as that of the axis X5 of a rotation shaft 21 of the roller drive portion 3 (described later).
  • drive means 18 such as a hydraulic cylinder
  • a stopper 19 is provided on a rear side of the clamp device 12, and the positioning of the workpiece 4 in the axial direction can be easily effected by abutting a rear end of the workpiece 4 against the stopper 19.
  • the stopper 19 is provided on the lower clamp 13, and is moved with the clamp device 12, and the position of this stopper can be adjusted in the direction of the tube axis X4 of the workpiece 4.
  • roller drive portion 3 on the base 1 will be described.
  • a rotation facility portion 20 is mounted on the base 1, and the rotation shaft 21 is rotatably provided on this portion 20, with its axis directed in the X-direction.
  • the rotation shaft 21 can be rotated in one direction by a motor 22, serving as rotation drive means, through a belt 23.
  • a roller holder 24 is fixed to the rotation shaft 21 on a side of the workpiece drive portion 2, and when the rotation shaft 21 is rotated, the roller holder 24 is rotated about the axis X5 of the rotation shaft 21.
  • Path changing means for changing a drive path of the rollers is provided on the rotation facility means 20.
  • This means comprises a cylinder 25, serving as drive means, and a ring plate 26 which is mounted at a distal end of a rod 25a of the cylinder 25, and is disposed within the roller holder 24 so that it will not interfere with the rotation of the roller holder 24.
  • the ring plate 26 is formed into an annular shape coaxial with the rotation shaft 21, and an outwardly-spreading, tapering surface 26a is formed on an inner surface of this ring plate at its distal end.
  • a plurality of (three in this embodiment) brackets 27 are mounted on the roller holder 24 at equal intervals in the circumferential direction, with their axes extending in the X-axis. Further, the brackets 27 are movable radially with respect to the axis X5 of the roller holder 24.
  • a tapering surface 27a is formed, along the tapering surface 26a of the ring plate 26, at one side of each bracket 27 corresponding to the inner side of the roller holder 24, and the roller 28 is freely rotatably mounted at the outer end of each bracket 27.
  • each bracket 27 is pushed toward the axis through the two tapering surfaces 26a and 27a, so that each of rollers 28 is moved the same amount toward the axis of the rotation shaft 21, respectively.
  • each bracket 27 is returned radially outwardly through the two tapering surfaces 26a and 27a, so that each of rollers 28 is moved the same amount radially outwardly of the roller holder, respectively.
  • Figs. 4A to 4D show a first embodiment according to a production method of the present invention.
  • Fig. 4A shows a first step, and shows a condition in which a cylindrical outer tube 4B of metal, which is larger in diameter than a cylindrical inner tube 4A of metal, is arranged around the inner tube 4A in concentric relation thereto, and a solid interposition material 4D is filled in an annular space 4C of a predetermined width formed between the two tubes 4A and 4B.
  • the product in this condition is the workpiece 4.
  • a hot-melt resin is used as the solid interposition material 4D, and for filling it, the inner and outer tubes 4A and 4B are held by suitable means in such a manner that the predetermine space 4C is formed therebetween, and one end of this space 4C is closed, and a resin in a heat-molten state is poured into the space 4C through the other end thereof, and is cooled and solidified, and is interposed as the solid interposition material 4D between the inner and outer tubes 4A and 4B.
  • the solid interposition material 4D has good filling and discharging abilities, and can be deformed to a certain degree when it is filled and formed into a solid state, and further has low compressibility (it may have non-compressibility), and preferably the solid interposition material is the above-mentioned hot-melt resin, but may be other material than this resin.
  • a melting point of the hot-melt resin is higher than a temperature of the workpiece 4 which is raised by the spinning.
  • a resin, marketed under the trade name "Seal Peal Hot” can be used as the above hot-melt resin.
  • the process shifts to a second step in which the workpiece 4 is held by the clamp device 12 of the spinning machine, and the end portions of the workpiece 4 are decreased in diameter, as shown in Fig. 4B.
  • the ring plate 26 of the spinning machine is located at a position spaced right from its position shown in Fig. 1, and the rollers 28 are retracted outwardly of the outer periphery of the workpiece 4 prior to the processing, and are held in an open condition.
  • the workpiece 4 is fitted in and placed on the clamp surface 13a of the lower clamp 13, with its rear end abutted against the stopper 19 set at a predetermined position, and thereafter the drive means 18 is operated to move the upper clamp 17 downward, so that the workpiece 4 is held between the upper and lower clamps 17 and 13 so as to prevent it from rotating.
  • the position of the clamp device 12 in the Y-direction is set by the drive means 16 to a position where an extension line of the axis of the angular-movement drive shaft 31a intersects an extension line of the axis X5 of the rotation shaft 21.
  • a mandrel 51 is inserted into that end of the inner tube 4A to be subjected to the spinning operation, as shown in Fig. 4B.
  • the mandrel 51 includes a decreased-diameter portion 51a, corresponding to the decreased diameter of the inner tube 4A, a tapering portion 51b, which extends from this decreased-diameter portion, and is slanting radially outwardly, and a larger-diameter portion 51c which is continuous with this tapering portion, and extends parallel to the axial direction, the larger-diameter portion 51c having an outer diameter substantially equal to the inner diameter of the workpiece 4.
  • the ball spline shaft 8 is rotated in one direction by the drive means 9, thereby moving the clamp device 12 right (in Fig. 1) in the X-direction parallel to the axis X5 of the rotation shaft 21, so that the rollers 28 are located at a diameter-decrease starting point A of the workpiece 4, as shown in Fig. 4B.
  • the motor 22, serving as the drive means is driven to rotate the roller holder 24 in one direction, and also the drive means 25 is operated to advance the ring plate 26 to move the path of revolution of the rollers 28 in the closing direction toward the center of the roller holder 24, and also the drive means 9 is driven to rotate the ball spline shaft 8 in a direction reverse to the above-mentioned direction, thereby moving the clamp device 12, together with the workpiece 4, backward left (in Fig. 1) in the X-direction.
  • rollers 28 while freely rotating in press-contact with the outer peripheral surface of the outer tube 4B in the workpiece 4, revolves about the tube axis X5, and also the diameter of the path of revolution of these rollers gradually decreases, thereby effecting the spinning operation starting from the diameter-decrease starting point A, as shown in Fig. 4B.
  • the outer tube 4B is deformed to be decreased in diameter, and also this deforming force is transmitted to the inner tube 4A through the solid interposition material 4D, so that the inner and outer tubes 4A and 4B and the solid interposition material 4D are simultaneously deformed.
  • a tapering portion 4b decreased in diameter from a stock tube portion 4a of the inner and outer tubes 4A and 4B, and a neck portion 4c, extending from a distal end of this tapering portion 4b, are sequentially formed, with the solid interposition material 4D held between the inner and outer tubes 4A and 4B.
  • the step of the above spinning operation may be effected with one pass or a plurality of passes of the rollers.
  • the diameter-decreasing processing of the neck portion 4c is accurately effected by the decreased-diameter portion 51a of the mandrel 51.
  • the spinning rollers 28 move along the tapering portion 51b of the mandrel 51 as indicated by an arrow in the drawing, and are moved away outwardly from the larger-diameter portion 51c of the mandrel 51.
  • the inner and outer tubes 4A and 4B are cut at a portion C shown in Fig. 4B, and a discard portion 4e is removed.
  • the workpiece 4, shaped in the second step is removed from the clamp device 12, and is inverted in the axial direction, and is again held by the clamp device 12, and as shown in Fig. 4C, the other tube end portion of the workpiece 4, opposite to that processed in the second step, is decreased in diameter by spinning process as in the second step.
  • the mandrel 51 may be used if necessary as in the second step.
  • the inner and outer tubes 4A and 4B are cut at a portion D shown in Fig. 4C, and a discard portion 4f is removed.
  • the cutting of the inner and outer tubes 4A and 4B in the second step and the cutting of these tubes in the third step may be effected at a time after the third step.
  • discard portions 4e and 4f are not always necessary, it is preferred to form these discard portions 4e and 4f and to remove them by cutting in order to accurately form the shape of the tube end portions.
  • each of the opposite end portions of the workpiece 4 has been decreased in diameter by one spinning process.
  • the shaped product is removed from the clamp device 12, and this product, obtained in the third step, and having the solid interposition material 4D remaining in the space 3C, may be provided as a final product.
  • the solid interposition material 4D may be removed in a fourth step so as to provide a final product having the space 4C formed between the inner and outer tubes 4A and 4B.
  • the solid interposition material 4D is hot-melt resin
  • the solid interposition material 4 can be easily flowed away and removed by heating the product in the fourth step.
  • the solid interposition material 4D In the case where a member with excellent heat-insulating properties, such as a heat-insulating mat, it is preferred that this solid interposition material should be left as it is. However, generally, when this container is used as an exhaust-system container of an automobile, a high heat-resistance is required, and therefore the solid interposition material 4D is removed.
  • Fig. 5 shows a second embodiment of a production method according to the present invention.
  • This second embodiment is directed to an embodiment, in which an interior member is contained in the inner tube 4A of the first embodiment, and shows an example in which it is applied to a catalytic converter of an exhaust system of an automobile.
  • a catalyst carrier 50 is inserted or press-fitted in the first step of the first embodiment shown in Fig. 4A.
  • a second step (Fig. 5B), a third step (Fig. 5C) and a fourth step (Fig. 5D) as described above in the first embodiment are effected, thereby producing a double-walled pipe as shown in Fig. 5D which contains the catalyst carrier 50 therein, and has a space 4C formed between the inner and outer tubes 4A and 4B.
  • the mandrel 51 is not always necessary, and may be used if necessary.
  • Fig. 6 shows a third embodiment of a production method according to the present invention.
  • This third embodiment is directed to an embodiment in which an interior member, such for example as a catalyst carrier 50 as described above in the second embodiment, is contained, and one ends of inner and outer tubes 4A and 4B are extended long, with a space 4C formed therebetween, and for example, a resonant-type muffler is formed integrally on the rear side of the catalytic converter 50 of the second embodiment.
  • a resonant-type muffler is formed integrally on the rear side of the catalytic converter 50 of the second embodiment.
  • that portion, designated by reference numeral 54 is the resonant-type muffler.
  • the production process of this third embodiment is basically similar to the production process of the second embodiment, and resonance holes 52 are beforehand formed in the inner tube 4A, and a mandrel, which is similar to the mandrel 51 described in the second embodiment, but has an extended insertion portion, is used during the spinning operation, and the resonance holes 52 are closed by this extension portion from the inside of the inner tube 4A.
  • One ends (for example, left ends in Fig. 6) of the inner and outer tubes 4A and 4B, shaped in this third embodiment, are fixed to other connection pipe whereas a wire net ring 53 for holding the inner and outer tubes 4A and 4B in a manner to allow them to move relative to each other is held between the other ends (for example, the right end in Fig. 6), so that a relative movement between the inner tube 4A and the outer tube 4B due to thermal expansion can be allowed.
  • the space 4C on the left side (side A) of the catalyst carrier 50 has a gradually decreasing thickness (the distance of the gap between the inner and outer tubes), and for shaping this left-side portion, the inner tube 4A and the outer tube 4B are beforehand decreased in diameter into tapering portions and neck portions as shown in the drawing, and then this inner tube 4A is inserted into the outer tube 4B, and the diameter-decreased portion of the inner tube 4A is held by holding means (not shown), and a solid interposition material 4D is filled into the space 4C between the inner tube 4A and the outer tube 4B on the right side (side B) of the catalyst carrier 50, and a spinning operation as described above is applied to the outer tube 4B.
  • exhaust gas is purified by the catalyst carrier 50, and also exhaust sounds flow through the resonance holes 52 into the gap 4C in the resonant-type muffler 54, so that the sounds are deadened by the gap 4C serving as a resonance space.
  • This gap 4C also achieves an originally-intended, heat-insulating effect.
  • the range of use of the mandrel 51 and the shape of this mandrel, the inner and outer tubes 4A and 4B, having the space 4C therebetween, can be formed in a desired manner.
  • Fig. 7 shows a fourth embodiment of a production method according to the present invention.
  • This fourth embodiment shows an example in which a double-walled pipe, in which the axes of the inner and outer tubes 4A and 4B are eccentric with respect to each other, is produced.
  • the inner tube 4A and the outer tube 4B are suitably made eccentric with respect to each other, and a solid interposition material 4D is filled in a gap 4C between the two tubes, and then the similar steps as described above in the first and second embodiments are effected, thereby producing the product.
  • Fig. 8 shows a fifth embodiment of a production method according to the present invention.
  • This fifth embodiment shows an example in which one diameter-decreased portion of the double-walled tube (container) is offset respect to the other diameter-decreased portion.
  • a workpiece 4 as shown above in Fig. 5A, in which a solid interposition material 4D is interposed between an inner tube 4A and an outer tube 4B, and an interior member (for example, a catalyst carrier 50) is contained in the inner tube 4A.
  • an interior member for example, a catalyst carrier 50
  • the ring plate 26 is located at a position spaced right from its position shown in Fig. 1, and the rollers 28 are retracted outwardly of the outer diameter of the workpiece 4 prior to the processing, and are held in an open condition.
  • the unprocessed workpiece 4 is fitted in and placed on the clamp surface 13a of the lower clamp 13, with its rear end abutted against the stopper 19 set at a predetermined position, and thereafter the drive means 18 is operated to move the upper clamp 17 downward, so that the workpiece 4 is held between the upper and lower clamps 17 and 13 against rotation.
  • the angular-movement drive means 31 is operated to angularly move the clamp device 12, so that the tube axis X4 of the workpiece 4, held by this clamp device, is parallel to the axis X5 of the rotation shaft 21.
  • the drive means 16 is operated to adjustably move the clamp device 12 in the Y-direction, so that the tube axis X4 of the workpiece 4 is parallel to and is offset a predetermined amount OF1 (see Fig. 9A) from the axis X5 of the rotation shaft 21.
  • the ball spline shaft 8 is rotated in one direction by the drive means 9, thereby moving the clamp device 12 right (in Fig. 1) in the X-direction to move the workpiece 4 forward (right in Fig. 1) toward the roller holder 24 by a predetermined amount in a direction parallel to the tube axis thereof, so that the rollers 28 are located at a diameter-decrease starting point A (see Fig. 9A) of the workpiece 4.
  • the motor 22, serving as the drive means is driven to rotate the roller holder 24 in one direction, and also the drive means 25 is operated to advance the ring plate 26 to move the path of revolution of the rollers 28 in the closing direction toward the center of the roller holder 24, and also the drive means 9 is reversely driven to rotate the ball spline shaft 8 in a direction reverse to the above-mentioned direction, thereby moving the clamp device 12, together with the workpiece 4, backward left (in Fig. 1) in the X-direction.
  • the workpiece 4 is continued to be moved backward, with the rollers 28 held in the closed position, and by doing so, a cylindrical neck portion 4c, having its axis coinciding with the revolution axis X5 and being parallel to the tube axis X4 of the workpiece 4, is formed at the distal end of the tapering portion 4b by plastic deformation.
  • the workpiece 4, as well as the rollers 28, is moved backward in a direction opposite to that of the forward movement (that is, the diameter-decreasing movement), and the first spinning operation is finished with this one reciprocation (forward-backward movement).
  • the rollers 28 are returned to the open position, and also the drive means 9 is operated to rotate the ball spline shaft 8 in one direction to further advance the workpiece 4, together with the clamp device 12, by a predetermined amount in a direction parallel to the tube axis thereof, so that the rollers 28 are located at a point B in Fig. 9C.
  • the drive means 16 is operated to rotate the ball spline shaft 15 in one direction to further move the workpiece 4, together with the clamp device 12, by a predetermined amount in the Y-direction, so that the amount OF2 of offset of the tube axis X4 of the workpiece 4 from the axis of the rotation shaft 21, that is, the axis X5 of revolution of the rollers 28, is made larger than the above offset amount OF1, as shown in Fig. 9C.
  • a spinning operation similar to the above spinning operation, is effected in such a manner that the amount of closing movement of the rollers 28 is larger than that in the above first process.
  • the tapering portion 4b is plastically deformed into the tapering portion 4b of a truncated cone-shape which has a larger tapering angle, and has its axis disposed on the revolution axis X5 offset an amount OF2 from the tube axis X4 of the stock tube portion (barrel portion) 4a of the workpiece 4.
  • the workpiece 4 is continued to be moved backward with the rollers 28 held in the closed position, and by doing so, the neck portion 4c, smaller in diameter than the neck portion of Fig. 9B, is formed at the distal end of the tapering portion 4b.
  • a diameter-decreased portion 4d having the offset tapering portion 4b and the offset tapering neck portion 4c which are integrally formed with each other, is formed at the end portion (right end portion in Fig. 8).
  • the outer tube 4B is deformed to be decreased in diameter, and also this deforming force is transmitted to the inner tube 4B through the solid interposition material 4D, so that the inner and outer tubes 4A and 4B and the solid interposition material 4D are simultaneously deformed.
  • the tapering portion 4b decreasing in diameter from the stock tube portion 4a of the inner and outer tubes 4A and 4B, and the neck portion 4c, extending from the distal end of this tapering portion 4b, are sequentially formed, with the solid interposition material 4D held between the inner and outer tubes 4A and 4B.
  • the workpiece 4, shaped in the above process is removed from the clamp device 12, and is inverted in the axial direction, and is again held by the clamp device 12, and the other tube end portion of the workpiece 4, opposite to that processed in the above process, is decreased in diameter by spinning process in a manner as described above.
  • the shaped product is removed from the clamp device 12, and this product, obtained in the third step, and having the solid interposition material 4D remaining in the space 4C, may be provided as a final product.
  • the solid interposition material 4D may be removed so as to provide a final product having the space 4C formed between the inner and outer tubes 4A and 4B.
  • Fig. 10 shows a sixth embodiment according to the present invention.
  • This sixth embodiment shows an example in which diameter-decreased portions and neck portions at opposite end portions are processed by bend-spinning.
  • the workpiece 4 similar to that of Fig. 4A, is fitted in and placed on the clamp surface 13a of the lower clamp 13, with its rear end abutted against the stopper 19 set at a predetermined position, and thereafter the drive means 18 is operated to move the upper clamp 17 downward, so that the workpiece 4 is held between the upper and lower clamps 17 and 13 against rotation.
  • the position of the clamp device 12 in the Y-direction is so set by the drive means 16 that an extension line of the axis of the angular-movement drive shaft 31a intersects an extension line of the axis X5 of the rotation shaft 21, as shown in Fig. 11A.
  • the angular-movement drive means 31 is operated to incline the clamp device 12 horizontally, so that the tube axis X4 of the workpiece 4 is horizontally inclined at a predetermined angle ⁇ 1 with respect to the axis X5 of the rotation shaft 21, as shown in Fig. 11A.
  • the ball spline shaft 8 is rotated in one direction by the drive means 9, thereby moving the clamp device 12 right (in Fig. 1) in the X-direction parallel to the axis X5 of the rotation shaft 21, so that the rollers 28 are located at a diameter-decrease starting point A of the workpiece 4, as shown in Fig. 11A.
  • the motor 22, serving as the drive means is driven to rotate the roller holder 24 in one direction, and also the drive means 25 is operated to advance the ring plate 26 to move the path of revolution of the rollers 28 in the closing direction toward the center of the roller holder 24, and also the drive means 9 is driven to rotate the ball spline shaft 8 in a direction reverse to the above-mentioned direction, thereby moving the clamp device 12, together with the workpiece 4, backward left (in Fig. 1) in the X-direction.
  • the rolls 28, while freely rotating in press-contact with the outer peripheral surface of the workpiece 4, revolves about the tube axis X5, and also the diameter of the path of revolution of these rollers gradually decreases, thereby effecting the spinning operation starting from the diameter-decrease starting point A, as shown in Fig. 11B.
  • the workpiece 4 is continued to be moved backward, with the rollers 28 held in the closed position, and by doing so, a cylindrical neck portion 4c, having its axis coinciding with the revolution axis X5 inclined at the angle ⁇ 1 with respect to the tube axis X4 of the workpiece 4, is formed at the distal end of the tapering portion 4b by plastic deformation.
  • the workpiece 4, as well as the rollers 28, is moved backward in a direction opposite to that of the forward movement (that is, the diameter-decreasing movement), and the first spinning operation is finished with this one reciprocation (forward-backward movement).
  • the rollers 28 are returned to the open position, and the drive means 9 is operated to rotate the ball spline shaft 8 in one direction to further advance the workpiece 4, together with the clamp device 12, by a predetermined amount in the X-direction, so that the rollers 28 are located at a point B in Fig. 11C, and also the angular-movement means 31 is operated to further incline the workpiece 4, together with the clamp device 12, by a predetermined amount, so that the angle ⁇ 2 between the tube axis X4 of the workpiece 4 and the axis of the rotation shaft 21, that is, the axis X5 of revolution of the rollers 28, is made larger than the angle ⁇ 1 in the above first step, as shown in Fig. 11C.
  • a spinning operation similar to the above spinning operation, is effected in such a manner that the amount of closing movement of the rollers 28 is larger than that during the above first process.
  • the tapering portion 4b shaped in the first process, is plastically deformed into the tapering portion 4b of a truncated cone-shape which has a larger tapering angle, and has its axis disposed on the revolution axis X5 inclined at the angle ⁇ 2 with respect to the tube axis X4 of the stock tube portion (barrel portion) 4a of the workpiece 4.
  • the workpiece 4 is continued to be moved backward in the X-direction with the rollers 28 held in the closed position, and by doing so, the neck portion 4c, having its axis disposed on the above axis X5 and smaller in diameter than the neck portion of the first process, is formed at the distal end of the tapering portion 4b.
  • a diameter-decreased portion 4d having the tapering portion 4b and the tapering neck portion 4c having its axis coinciding with the axis X5 inclined with respect to the axis X4, which are integrally formed with each other, is formed at the end portion of the barrel portion 4a having its axis coinciding with the axis X4, the as shown in Fig. 12. It is not always necessary to effect the inclining movement only about the angular-movement drive shaft 31, and when the inclining movement about the angular-movement drive shaft 31 and the movement in the X- and/or Y-direction are used in combination, the degree of freedom of the shaping further increases.
  • the workpiece 4, decreased in diameter, is inverted in the forward-backward direction, and is again held by the clamp device 12, and a spinning operation, similar to the above spinning operation, is effected, and by doing so, the tapering portions 4d, 4d, as well as the neck portions 4c, 4c, subjected to bend spinning, are formed at the opposite ends, respectively, as shown in Fig. 13.
  • the product is removed from the clamp device 12, and this product, having the solid interposition material 4D remaining in the space 3C, may be provided as a final product.
  • the solid interposition material 4D may be removed so as to provide a final product having the space 4C formed between the inner and outer tubes 4A and 4B.
  • thermoplastic resin may be used as the solid interposition material 4D.
  • a heat-insulating member may be used. In the case of using this heat-insulating member, it is preferred that the inner tube 4A of the workpiece 4 be press-fitted into the outer tube 4B, with the heat-insulating member wound around the outer periphery of the inner tube.
  • a muffler and a catalytic converter originally require a heat-insulating material, and therefore there is no need to remove the solid interposition material 4D after the shaping operation. In such a case, the step of removing the solid interposition material 4D can be omitted.
  • ice may be used, in which case water is poured into the space 4C, and then is frozen into ice.
  • metal shots may be used.
  • Other materials, which can be changed into a solid or a liquid upon application of heat, can be used, and examples thereof includes a molten salt, such as nitrate and nitrite, a metal of a low melting point, and a compound thereof.
  • a mandrel may be inserted in the outer tube 4B.
  • the workpiece 4 may be fixed whereas the spinning rollers 28 are moved in the direction of the tube axis, or both may be moved.
  • the drive path that is, the means for continuously controlling the rollers in the deforming direction, is arbitrary.
  • the workpiece 4 is fixed while the spinning rollers 28 is revolved.
  • the axis X5 of the roller drive portion 3 and the axis X4 of the workpiece drive portion 2 are parallel to each other, and are disposed on a common line
  • each of the above embodiments is directed to the containers of the exhaust-system parts of an automobile
  • the present invention can be applied to other articles such as a general-purpose container and an article for daily use such as a pot, and the invention is not limited to the above use.
  • a first step of Fig. 14A an inner tube 4A is inserted into an outer tube 4B. Then, a solid interposition material 4D is filled into a space 4C formed between the inner and outer tubes as shown in Fig. 14B, thereby forming a workpiece 4 shown in Fig. 4C.
  • this workpiece 4 is held by the clamp device 12 of the spinning machine, and one end portion of this workpiece 4 is decreased in diameter as shown in Fig. 14D.
  • the outer tube 4B is deformed to be decreased in diameter, and this deforming force is transmitted to the inner tube 4A through the solid interposition material 4D, so that the inner and outer tubes 4A and 4B and the solid interposition material 4D are simultaneously deformed.
  • a tapering portion 4b decreased in diameter from a stock tube portion 4a of the inner and outer tubes 4A and 4B, and a neck portion 4c, extending from a distal end of this tapering portion 4b, are sequentially formed, with the solid interposition material 4D held between the inner and outer tubes 4A and 4B.
  • the inner and outer tubes 4A and 4B are cut at a portion C shown in Fig. 14D, and a discard portion 4e is removed.
  • the step of the above spinning operation may be effected with one pass or a plurality of passes of the rollers.
  • the diameter-decreasing processing of the neck portion 4c is accurately effected by the decreased-diameter portion 51a of the mandrel 51.
  • the spinning rollers 28 move along the tapering portion 51b of the mandrel 51 as indicated by an arrow in the drawing, and are moved away outwardly from the larger-diameter portion 51c of the mandrel 51.
  • the one end portion of the workpiece 4 is decreased in diameter by spinning operation.
  • the shaped product is removed from the clamp device 12, and this product, obtained in the third step, and having the solid interposition material 4D remaining in the space 4C, may be provided as a final product.
  • the solid interposition material 4D may be removed in a fourth step so as to provide a final product having the space 4C formed between the inner and outer tubes 4A and 4B.
  • the container having one closed end thereof, is formed.
  • the inner and outer tubes of the double-walled container having the space between the inner and outer tubes, can be simultaneously deformed and shaped into desired cross-sections by applying the spinning processing simultaneously to the inner and outer tube, and therefore as compared with the conventional method, the facilitation of the processing and the reduction of the processing time can be achieved, and the processing cost can be greatly reduced.
  • the inner tube is arranged in the outer tube, with the space formed therebetween, and the solid interposition material is held between the tubes at least in one region of the space extending in the direction of the tube axis, and in this condition, the spinning rollers are revolved to apply a spinning processing to the outer tube, thereby simultaneously changing the cross-sections of the inner and outer tubes in eccentric relation to the tube axis of the workpiece of the inner and outer tubes. Therefore, the inner and outer tubes, changed in eccentric relation to the tube axis of the workpiece, can be produced while securing the above effects.
  • the inner tube is arranged in the outer tube, with the space formed therebetween, and the solid interposition material is held between the tubes at least in one region of the space extending in the direction of the tube axis, and the tube axis of the workpiece of said inner and outer tubes is inclined with respect to the axis of the spinning rollers, and the spinning rollers are revolved to apply a spinning processing to the outer tube, thereby changing the cross-sections of the inner and outer tubes in slantingly-bending relation to the tube axis of the workpiece. Therefore, the inner and outer tubes, changed in bending relation to the tube axis of the workpiece, can be produced while securing the above effects.
  • the inner and outer tubes can be prevented by the mandrel, and the desired cross-sectional shape can be positively obtained. Further, by selecting the position of the mandrel, the inner and outer tubes can be deformed into different cross-sectional shapes, respectively, in such a manner that the amount of deformation of the inner tube is different from that of the outer tube, and the cross-sectional shapes of the inner and outer tubes can be made different from each other by simultaneously spinning the inner and outer tubes.
  • the mandrel is inserted into at least one of the inner and outer tubes at least at one region thereof, and by doing so, the charging and removal of the solid interposition material, can be effected easily and rapidly, and therefore the efficiency of the operation can be enhanced.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Silencers (AREA)
EP99944778A 1998-09-24 1999-09-22 Procede de production d'un conteneur a structure double Withdrawn EP1025923A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP26944798 1998-09-24
JP10269447A JP2957176B1 (ja) 1998-09-24 1998-09-24 二重構造容器の製造方法
PCT/JP1999/005184 WO2000016924A1 (fr) 1998-09-24 1999-09-22 Procede de production d'un conteneur a structure double

Publications (1)

Publication Number Publication Date
EP1025923A1 true EP1025923A1 (fr) 2000-08-09

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EP99944778A Withdrawn EP1025923A1 (fr) 1998-09-24 1999-09-22 Procede de production d'un conteneur a structure double

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EP (1) EP1025923A1 (fr)
JP (1) JP2957176B1 (fr)
WO (1) WO2000016924A1 (fr)

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