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WO2012033008A1 - Method for producing metallic flexible tube - Google Patents

Method for producing metallic flexible tube Download PDF

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Publication number
WO2012033008A1
WO2012033008A1 PCT/JP2011/069988 JP2011069988W WO2012033008A1 WO 2012033008 A1 WO2012033008 A1 WO 2012033008A1 JP 2011069988 W JP2011069988 W JP 2011069988W WO 2012033008 A1 WO2012033008 A1 WO 2012033008A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
bellows
ring
flexible tube
locking ring
Prior art date
Application number
PCT/JP2011/069988
Other languages
French (fr)
Japanese (ja)
Inventor
後根裕司
Original Assignee
ゼンシン株式会社
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 ゼンシン株式会社 filed Critical ゼンシン株式会社
Publication of WO2012033008A1 publication Critical patent/WO2012033008A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/14—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics
    • F16L11/15—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics corrugated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L13/00—Non-disconnectable pipe joints, e.g. soldered, adhesive, or caulked joints
    • F16L13/02—Welded joints
    • F16L13/0218—Welded joints having an inner or outer ring

Definitions

  • the present invention relates to a method for manufacturing a metal flexible tube having a structure in which, for example, a flexible joint of various pipes for sending fluid is used and the edge of a blade covering the outer peripheral side of a bellows is welded at the end of the flexible tube. Is.
  • a metal flexible tube used as a flexible joint for various pipes that send fluid covers the outer peripheral side of a bellows formed by alternately forming peaks and valleys with a blade formed by knitting metal wires. Protected structure. The blade is prevented from coming out in the axial direction by welding its end edge to a ring disposed at the end of the bellows (see, for example, Patent Document 1).
  • the end portion of the blade is provided with a margin of length, and the surplus portion is sandwiched or used with a clipper or the like.
  • the blade is manually cut, and the end of the blade is shaped to conform to the shape of the end of the flexible tube, and then the edge of the blade is welded to the bellows side.
  • the present invention aims to provide a method capable of manufacturing a metal flexible tube by easily shaping, cutting and welding a blade.
  • a metal flexible tube manufacturing method includes a bellows formed by alternately and repeatedly forming ridges and valleys, and a cylindrical blade covering the outer peripheral side of the bellows.
  • a locking ring that is interposed between the bellows and the blade and is locked to the valley at the end of the bellows, and the outer peripheral side protrudes outward in the radial direction from the peak of the bellows, and the locking ring via the blade
  • a retaining ring having an L-shaped cross section for retaining the outer peripheral surface of the blade so as to follow the outer surface shape of the retaining ring, and the edge of the blade in the central axial direction is retained. It is for manufacturing the metal flexible tube welded to the ring and the presser ring.
  • the blade is arranged on the outer peripheral side of the bellows, the locking ring is interposed between the bellows and the blade and locked to the valley at the end of the bellows, and the presser ring is set on the outer peripheral side of the end of the blade.
  • the end of the blade is set to a length that protrudes outward in the central axis direction from the locking ring.
  • a central hole in the central axial direction of the metal flexible tube is passed through the central hole of the support that supports the metal flexible tube, and a press ring is received at the inner peripheral edge of the upper surface of the support tool, and the end of the bellows
  • the pressing force is transmitted to the support tool via the locking ring, blade and presser ring, and the presser foot is pressed from the support tool.
  • the end of the blade is pressed by the presser ring by the reaction force acting on the ring, and the end of the blade is shaped to conform to the outer surface shape of the locking ring. Further, the blade is welded to the locking ring and the holding ring while the end of the blade is melted and the excess portion is removed while the end of the bellows is pressed.
  • the end of the bellows is pressed in the direction of the central axis while supporting the presser ring, the end of the blade is formed by crushing the end of the bellows in the direction of the central axis to form a flat packing surface.
  • the edge of the blade can be surely adjusted to a predetermined position. Moreover, it is possible to eliminate the process of once holding the metal flexible tube with the blade shaped, cutting the blade, and then holding the metal flexible tube again before welding the edge of the blade. The number of man-hours required for blade edge processing can be reduced.
  • the welding portion in addition to the shielding gas blown out from the welding torch, the welding portion can be gas-sealed by the shielding gas blown out from another gas blowing portion, and the current value of the welding torch is increased to such an extent that the blade can be blown out. Therefore, oxidation of the weld bead can be prevented.
  • the gas blowing portion is configured so that the front end in the traveling direction runs parallel to the welding torch and the rear end in the traveling direction is delayed from the welding torch, and the gas shielding is performed until the welding bead is cooled to an extent that does not cause oxidation. Can also be adopted.
  • the shield gas blown out from the front end in the traveling direction of the gas blowing part and the shield gas blown out from the welding torch are both the same welded part. It means that the gas blowing portion and the welding torch are positioned so as to be blown to the front and advanced in the direction of the weld line.
  • the shielding gas is blown to the inner peripheral surface of the end portion of the bellows, the end portion of the bellows that is not directly welded is prevented from being oxidized by heat when welding and cutting the blade on the outer peripheral side. be able to.
  • the pressing tool for crushing the end of the bellows closes the end opening of the bellows and blows out the shielding gas from the pressing tool, thereby preventing the shielding gas from escaping from the inside of the bellows. It can also be used as a lid for this purpose and as a shield gas blowing device.
  • the end of the bellows since the end of the bellows is pressed while supporting the presser ring, the end of the blade can be shaped while forming the packing surface on the end of the bellows in one step. Can do.
  • the blade since the blade is welded while fusing while the end of the bellows is pressed, it is easy to align the edge of the blade and to the metal flexible tube holder for cutting the blade. The attachment and detachment can be eliminated, and the metal flexible tube can be manufactured by easily shaping, cutting and welding the blade.
  • the welding part is gas-sealed with a shield gas blown out from another gas blowing part, so that the so-called welding burn in which the weld bead is oxidized can be prevented. It is also possible to prevent welding burns caused by welding with heat that can be melted. This eliminates the need for manual buffing and painting of the welded portion, making it easier to manufacture the metal flexible tube.
  • FIG. 1 The figure which shows the metal flexible tube manufactured with the manufacturing method which concerns on this invention, a right half is sectional drawing, and a left half is a side view Figure showing only the left half of the metal flexible tube front view It is an enlarged view showing the end of a metal flexible tube, the right half is a cross-sectional view, the left half is a side view Schematic diagram of metal flexible tube end processing equipment It is a figure which shows the edge part processing device equipped with a metal flexible tube, the right half is a sectional view, the left half is a side view The figure explaining the procedure which processes the edge part of a metal flexible tube The figure which shows another form which processes the edge part of a metal flexible tube
  • the metal flexible tube 1 is used as, for example, a flexible joint of various pipes for sending a fluid, and is formed by alternately and repeatedly forming peaks 2 and valleys 3.
  • a presser ring 7 for pressing the outer peripheral surface of the blade 5 so as to follow the outer surface shape is provided, and a flange 8 for connecting to another pipe is locked to the end portion.
  • the bellows 4 is made of stainless steel, for example, by applying a load to the inside or outside of a straight pipe having a thickness of about 0.2 mm to 0.35 mm to cause the peaks 2 to bulge at predetermined intervals.
  • a flanged tube structure in which the portions 3 are alternately repeated continuously is provided.
  • the blade 5 is made of, for example, a stainless steel cylinder formed by knitting a metal wire having a diameter of about 0.3 mm, and covers the bellows 4 from the outer peripheral side to protect it while maintaining flexibility.
  • the edge of the blade 5 in the central axis direction is welded to the locking ring 6 and the presser ring 7 to prevent the blade 5 from coming out in the central axis direction.
  • the locking ring 6 is made of, for example, stainless steel, has an outer side length of about 5 mm, and has a ring shape with an L-shaped cross section, one piece of which is an inward piece 6a protruding inward in the radial direction.
  • the locking ring 6 has a split structure, and is locked to the end portion of the bellows 4 by inserting the inward piece 6a into the valley portion 3a so as to sandwich the end portion of the bellows 4 from the outer peripheral side.
  • the outer peripheral side of the locking ring 6 protrudes outward in the radial direction from the peak 2 of the bellows 4 and is covered with the blade 5 so that the flange 8 is locked to the end of the metal flexible tube 1.
  • the step is formed.
  • the presser ring 7 is formed into a ring shape having an L-shaped cross section formed by pressing a ring-shaped plate made of, for example, stainless steel and having a thickness of about 0.8 mm, and the edge thereof is formed on the edge of the blade 5 and the periphery of the locking ring 6. Welded.
  • the presser ring 7 functions as a receiving part for receiving the flange 8 while pressing the end part of the blade 5 so as to follow the outer surface shape of the locking ring 6.
  • the flange 8 is made of, for example, steel and is a donut-shaped disk having a central hole that penetrates the metal flexible tube 1, and a notch on the inner peripheral edge thereof is formed in the holding ring 7 at the end of the metal flexible tube 1. It is locked from the center side in the central axis direction and is connected to another pipe by a bolt penetrating the bolt hole 8a.
  • the blade 5 is disposed on the outer peripheral side of the bellows 4, the locking ring 6 is interposed between the bellows 4 and the blade 5, and the inwardly facing piece 6 a of the locking ring 6 is formed in the valley 3 a at the end of the bellows 4. Further, the presser ring 7 is disposed on the outer peripheral side of the end portion of the blade 5. In this state, the end portion of the blade 5 is provided with a margin in advance so that the end portion of the blade 5 protrudes outward in the central axis direction from the locking ring 6.
  • the end surface processing device 10 is used to form the packing surface 9 on the end surface of the bellows 4, and the end portion of the blade 5 is shaped along the outer surface shape of the locking ring 6.
  • the ends are welded to the locking ring 6 and the presser ring 7.
  • the end processing apparatus 10 for processing the end of the metal flexible tube 1 will be described.
  • the end processing device 10 includes a support 11 that supports the metal flexible tube 1, a pressing tool 12 that presses the end of the bellows 4, and an end of the blade 5.
  • a welding torch 13 for welding to the locking ring 6 and the presser ring 7, and a gas blowing portion 14 for blowing additional shielding gas in addition to the shielding gas blowing from the blowing hole 13 a of the welding torch 13 are provided.
  • the support 11 is formed in a ring shape having a substantially square cross section that is supported by the periphery of the opening 16 of the apparatus main body 15, and the central hole 17 penetrates the central portion in the central axis direction of the metal flexible tube 1, and the upper surface
  • the presser ring 7 is received by a notch 18 on the inner peripheral edge.
  • the pressing tool 12 is formed in a columnar shape with the central axis aligned above the support tool 11 and is supported by the support bar 19 so as to be movable up and down.
  • the diameter of the pressing tool 12 is set to be approximately the same as the outer diameter of the locking ring 6, can enter the inside of the end of the blade 5, and closes the end opening of the bellows 4 while centering the end of the bellows 4. It can be pressed in the axial direction.
  • a small-diameter portion 20 that is inserted inside the metal flexible tube 1 is provided on the lower surface side of the central portion of the pressing tool 12, and a shielding gas is blown to the small-diameter portion 20 on the inner peripheral surface of the end portion of the bellows 4.
  • a plurality of outlet holes 21 are formed at intervals in the circumferential direction.
  • well-known inert gas such as argon gas conventionally used as shielding gas in welding, can be used for shielding gas.
  • the welding torch 13 is the same as a well-known welding torch used for TIG welding, and moves the outer peripheral side of the blade 5 in the circumferential direction so as to melt the end of the blade 5 while locking the blade 5. 6 and the presser ring 7 are welded.
  • the welding torch 13 is set to have a current value high enough to melt the blade 5, and the blade 5 itself is used as a welding material without using an additional welding rod.
  • the gas blowing portion 14 has a plurality of blowing holes 22 for blowing shield gas arranged in the main body along the circumferential direction of the metal flexible tube 1, and is provided rearward in the moving direction of the welding torch 13. .
  • the gas blowing portion 14 moves in the circumferential direction on the outer peripheral side of the blade 5 so that the blowing hole 22a at the front end in the traveling direction runs parallel to the welding torch 13 and the blowing hole 22b at the rear end in the traveling direction is behind the welding torch 13. However, additional shielding gas is blown out.
  • the presser ring 7 located on the outer peripheral side of the end of the blade 5 is hung on the support 11 and supported. In this state, only the weight of the metal flexible tube 1 acts on the support 11, and the entire metal flexible tube 1 is moved without causing a reaction force to shape the blade 5 to act on the holding ring 7. To support.
  • the pressing tool 12 is moved downward to enter the inside of the end of the blade 5, and the small diameter portion 20 of the pressing tool 12 is inserted inside the end of the bellows 4.
  • the pressing tool 12 is further moved downward to close the end opening of the bellows 4 at the lower peripheral edge of the pressing tool 12, and the end of the bellows 4 is pressed in the central axis direction with a force of, for example, a maximum of about 6 kg.
  • One crest 2 at the end of 4 is crushed in the direction of the central axis to form a packing surface 9 on the end surface of the bellows 4.
  • the pressing force of the pressing tool 12 is transmitted to the support tool 11 via the locking ring 6 that is locked to the end of the bellows 4, the blade 5, and the pressing ring 7, and from this support tool 11 to the pressing ring 7.
  • the presser ring 7 presses the blade 5 by the reaction force that acts, and the end of the blade 5 is shaped to conform to the outer surface shape of the locking ring 6.
  • the welding torch 13 is moved in the circumferential direction on the outer peripheral side of the blade 5, and the end portion of the blade 5 is melted while the end portion of the blade 5 is melted. Weld to ring 7. As a result, as shown in FIG. 6C, the edge of the blade 5 is welded to the edge of the holding ring 7 and the periphery of the locking ring 6, and the excess portion of the edge of the blade 5 is removed. .
  • the shield gas is blown out from the blowing hole 13 a of the welding torch 13, and the gas blowing portion 14 is parallel to the welding torch 13 in the traveling direction front end. Then, it advances in the circumferential direction of the blade 5 so that the rear end in the moving direction is delayed from the welding torch 13.
  • gas shielding is performed until the welding bead is cooled to an extent that does not cause oxidation.
  • the shielding gas is blown out from the blowing hole 21 of the small diameter portion 20 inserted inside the end of the bellows 4 to the inner peripheral surface of the end of the bellows 4.
  • the inside of the bellows 4 that is not directly welded is gas-sealed, and the inside of the bellows 4 is prevented from being oxidized by heat generated when the blade 5 is welded.
  • the flange 8 is mounted so as to be engaged with the presser ring 7, and the processing of the end portion of the metal flexible tube 1 is completed.
  • the end of the bellows 4 is crushed to form the packing surface 9, and at the same time, the end of the blade 5 is connected to the outer surface of the locking ring 6. It can be shaped to follow the shape.
  • the end of the bellows 4 is pressed, the end of the blade 5 is melted and welded to the locking ring 6 and the presser ring 7, so that the metal flexible tube 1 is temporarily removed from the end processing apparatus 10.
  • the excess portion at the end of the blade 5 can be removed without detaching and manually cutting the blade 5. Thereby, the man-hour for the end portion processing can be reduced and the blade 5 can be cut at an accurate position.
  • the shielding gas is blown out from the blowing hole 13a of the welding torch 13 and the additional shielding gas is blown out from the gas blowing portion 14, the welding burn caused by increasing the current value of the welding torch 13 to the extent that the blade 5 can be melted is prevented. can do.
  • the welding gas can be prevented by the shielding gas from the gas blowing portion 14 until the weld bead is cooled, buffing and coating for the welding burn can be eliminated.
  • the cooling of the weld bead can be promoted by the shielding gas.
  • the metal flexible tube 1 is used.
  • the diameter of the gas was 15 A
  • the temperature was 170 ° C.
  • the diameter was 50 A
  • the temperature was 332 ° C.
  • the diameter was 131 ° C. when the diameter was 15A and 201 ° C. when the diameter was 50A.
  • the shielding gas is blown out from the blowout hole 21 of the pressing tool 12 to the inside of the bellows 4, it is possible to prevent the bellows 4 that is not directly welded from being burned by the welding heat of the blade 5.
  • this invention is not limited to said embodiment, A change can be suitably added within the scope of the present invention.
  • the presser ring 7 instead of receiving the presser ring 7 with the support 11 to process the end portion of the metal flexible tube 1, the presser ring 7 can be received using the flange 8 as shown in FIG. . Further, the shielding gas can be blown out only from the blowing hole 13 a of the welding torch 13 without blowing out the shielding gas from the gas blowing portion 14 or the pressing tool 12.
  • the manufacturing method according to the present invention can be suitably employed as a method for manufacturing a metal flexible tube used as a flexible joint for various pipes for sending fluid, for example.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Arc Welding In General (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

Disclosed is a production method by which a blade can be easily shaped, cut, and welded to form a metallic flexible tube. Specifically, a blade (5) is arranged on the outer peripheral side of a bellows (4). A locking ring (6) is arranged between the bellows (4) and the blade (5). The locking ring (6) is locked at a valley portion (3a) on an end portion of the bellows (4). A pressing ring (7) is arranged on the outer peripheral side of an end of the blade (5). The end of the blade (5) is set to have a length projecting m than the locking ring (6) in the central axis direction. The pressing ring (7) is supported by a support tool (11). An end of the bellows (4) is pressed by a pressing tool (12) in the central axis direction to crush the end of the bellows (4). At the same time, an end of the blade (5) is shaped to follow the outer shape of the locking ring (6). While the end of the bellows (4) is pressed, the end of the blade (5) is cut by fusion, and a surplus portion is removed. At the same time, the blade (5) is welded with the locking ring (6) and the pressing ring (7).

Description

金属製可撓管の製造方法Method for manufacturing metal flexible tube
　本発明は、例えば流体を送る各種管類のフレキシブルジョイントとして用いられ、ベローズの外周側を覆うブレードの端縁が可撓管端部で溶接された構造の金属製可撓管を製造する方法に関するものである。 The present invention relates to a method for manufacturing a metal flexible tube having a structure in which, for example, a flexible joint of various pipes for sending fluid is used and the edge of a blade covering the outer peripheral side of a bellows is welded at the end of the flexible tube. Is.
　一般に、流体を送る各種管類のフレキシブルジョイントとして用いられる金属製可撓管は、山部及び谷部を交互に形成してなるベローズの外周側を、金属線を編成してなるブレードで覆って保護した構造とされる。ブレードは、その端縁をベローズの端部に配置されたリングに溶接するなどして、ブレードの軸方向への抜け出しが阻止されている（例えば特許文献１参照）。 In general, a metal flexible tube used as a flexible joint for various pipes that send fluid covers the outer peripheral side of a bellows formed by alternately forming peaks and valleys with a blade formed by knitting metal wires. Protected structure. The blade is prevented from coming out in the axial direction by welding its end edge to a ring disposed at the end of the bellows (see, for example, Patent Document 1).
特開２００４－３０１１５０号公報JP 2004-301150 A
　ところで、従来の金属製可撓管は、そのブレードをベローズの外周側に配置する際に、ブレードの端部に長さの余裕を持たせておき、余った部分を挟みやバリカンなどを用いて手作業で切断すると共に、ブレードの端部を可撓管の端部形状に沿うよう形付けし、その後、ブレードの端縁をベローズ側に溶接するようにしている。 By the way, in the conventional metal flexible tube, when the blade is arranged on the outer peripheral side of the bellows, the end portion of the blade is provided with a margin of length, and the surplus portion is sandwiched or used with a clipper or the like. The blade is manually cut, and the end of the blade is shaped to conform to the shape of the end of the flexible tube, and then the edge of the blade is welded to the bellows side.
　そのため、ブレードを切断した後に形付けしようとすると、形付け後に端縁が所定の位置に合うようにブレードを切断するのが難しくなりやすい。一方、ブレードを形付けした後に切断しようとすると、ブレードを形付けする際に金属製可撓管を保持する保持具から金属製可撓管を一旦取り外して、手作業でブレードを切断した後、金属製可撓管を再び保持してブレードの端縁を溶接する必要があり、ブレードの端部処理に要する工数が多くなる。 Therefore, when trying to shape after cutting the blade, it is likely to be difficult to cut the blade so that the edge is in a predetermined position after shaping. On the other hand, when trying to cut after shaping the blade, after removing the metal flexible tube from the holder that holds the metal flexible tube when shaping the blade, and manually cutting the blade, It is necessary to hold the metal flexible tube again and weld the edge of the blade, which increases the man-hours required for blade edge processing.
　本発明は、ブレードを容易に形付け、切断及び溶接して金属製可撓管を製造することのできる方法の提供を目的とする。 The present invention aims to provide a method capable of manufacturing a metal flexible tube by easily shaping, cutting and welding a blade.
　上記目的を達成するために、本発明に係る金属製可撓管の製造方法は、山部及び谷部を交互に繰り返し形成してなるベローズと、このベローズの外周側を覆う筒状のブレードと、ベローズ及びブレード間に介在されてベローズの端部の谷部に係止され、外周側がベローズの山部よりも半径方向で外向きに突出する係止リングと、この係止リングにブレードを介して中心軸方向で中央側から係止され、係止リングの外面形状に沿わせるようブレードの外周面を押える断面Ｌ字形の押えリングとを備え、そのブレードの中心軸方向の端縁が係止リング及び押えリングに溶接された金属製可撓管を製造するためのものである。 In order to achieve the above object, a metal flexible tube manufacturing method according to the present invention includes a bellows formed by alternately and repeatedly forming ridges and valleys, and a cylindrical blade covering the outer peripheral side of the bellows. A locking ring that is interposed between the bellows and the blade and is locked to the valley at the end of the bellows, and the outer peripheral side protrudes outward in the radial direction from the peak of the bellows, and the locking ring via the blade And a retaining ring having an L-shaped cross section for retaining the outer peripheral surface of the blade so as to follow the outer surface shape of the retaining ring, and the edge of the blade in the central axial direction is retained. It is for manufacturing the metal flexible tube welded to the ring and the presser ring.
　具体的には、ベローズの外周側にブレードを配置し、係止リングをベローズ及びブレード間に介在させてベローズの端部の谷部に係止し、押えリングをブレードの端部の外周側に配置すると共に、ブレードの端部を係止リングよりも中心軸方向で外側に突出する長さに設定する。 Specifically, the blade is arranged on the outer peripheral side of the bellows, the locking ring is interposed between the bellows and the blade and locked to the valley at the end of the bellows, and the presser ring is set on the outer peripheral side of the end of the blade. At the same time, the end of the blade is set to a length that protrudes outward in the central axis direction from the locking ring.
　次いで、金属製可撓管を支持する支持具の中央穴に金属製可撓管の中心軸方向中央部を貫通させて前記支持具の上面側内周縁で押えリングを受け、ベローズの端部を押圧具で中心軸方向に押圧することにより、ベローズの端部を中心軸方向に押し潰しつつ、その押圧力を係止リング、ブレード及び押えリングを介して支持具に伝え、この支持具から押えリングに作用する反力によって押えリングでブレードの端部を押えて、このブレードの端部を係止リングの外面形状に沿わせるよう形付けする。さらに、ベローズの端部を押圧したまま、ブレードの端部を溶断して余剰部分を除去しながら、ブレードを係止リング及び押えリングに溶接する。 Next, a central hole in the central axial direction of the metal flexible tube is passed through the central hole of the support that supports the metal flexible tube, and a press ring is received at the inner peripheral edge of the upper surface of the support tool, and the end of the bellows By pressing the end of the bellows in the direction of the central axis with the pressing tool, the pressing force is transmitted to the support tool via the locking ring, blade and presser ring, and the presser foot is pressed from the support tool. The end of the blade is pressed by the presser ring by the reaction force acting on the ring, and the end of the blade is shaped to conform to the outer surface shape of the locking ring. Further, the blade is welded to the locking ring and the holding ring while the end of the blade is melted and the excess portion is removed while the end of the bellows is pressed.
　上記構成によれば、押えリングを支持してベローズの端部を中心軸方向に押圧するので、ベローズの端部を中心軸方向に押し潰して平らなパッキン面を形成しつつ、ブレードの端部を押えリングで押えて係止リングの外面形状に沿うよう形付けすることができ、パッキン面の形成とブレード端部の形付けとを１つの工程で行うことができる。 According to the above configuration, since the end of the bellows is pressed in the direction of the central axis while supporting the presser ring, the end of the blade is formed by crushing the end of the bellows in the direction of the central axis to form a flat packing surface. Can be shaped so as to conform to the outer surface shape of the locking ring by pressing with the retaining ring, and the formation of the packing surface and the shaping of the blade end can be performed in one step.
　さらに、ブレードを形付けするようベローズの端部を押圧したまま、ブレードの端部を溶断しながら溶接するので、ブレードの端縁を所定の位置に確実に合わせることができる。しかも、ブレードを形付けした金属製可撓管を一旦取り外して、ブレードを切断した後、ブレードの端縁を溶接する前に金属製可撓管を再び保持するという工程を不要にすることができ、ブレードの端部処理に要する工数を少なくすることができる。 Furthermore, since the end of the blade is welded while being melted while pressing the end of the bellows so as to shape the blade, the edge of the blade can be surely adjusted to a predetermined position. Moreover, it is possible to eliminate the process of once holding the metal flexible tube with the blade shaped, cutting the blade, and then holding the metal flexible tube again before welding the edge of the blade. The number of man-hours required for blade edge processing can be reduced.
　また、ブレードを係止リング及び押えリングに溶接する際、溶接トーチからシールドガスを吹き出すと共に、溶接トーチとは別のガス吹出部から溶接部位にシールドガスを吹き出すようにする構成も採用可能である。 Further, when welding the blade to the locking ring and the presser ring, it is possible to employ a configuration in which the shielding gas is blown out from the welding torch and the shielding gas is blown out from the gas blowing portion different from the welding torch to the welding site. .
　この構成によれば、溶接トーチから吹き出すシールドガスに加えて、別のガス吹出部から吹き出すシールドガスによって、溶接部位をガスシールすることができ、ブレードを溶断できる程度に溶接トーチの電流値を高めることによる溶接ビードの酸化を防止することができる。 According to this configuration, in addition to the shielding gas blown out from the welding torch, the welding portion can be gas-sealed by the shielding gas blown out from another gas blowing portion, and the current value of the welding torch is increased to such an extent that the blade can be blown out. Therefore, oxidation of the weld bead can be prevented.
　また、ガス吹出部を進行方向前端が溶接トーチと並走して進行方向後端が溶接トーチよりも遅れるよう進行させ、溶接ビードが酸化を生じない程度に冷却するまでガスシールドするようにする構成も採用可能である。 In addition, the gas blowing portion is configured so that the front end in the traveling direction runs parallel to the welding torch and the rear end in the traveling direction is delayed from the welding torch, and the gas shielding is performed until the welding bead is cooled to an extent that does not cause oxidation. Can also be adopted.
　この構成によれば、ガス吹出部の進行方向前端を溶接トーチと並走させるので、溶接トーチから吹き出すシールドガスに加えて、ガス吹出部の進行方向前端から吹き出すシールドガスによって、溶接部位の酸化を防止することができる。しかも、ガス吹出部の進行方向後端を溶接トーチよりも遅れるよう進行させるので、ガス吹出部の進行方向前端から後端に至る範囲から吹き出すシールドガスによって、溶接ビードが冷えるまでに酸化するのを防止すると共に、溶接ビードの温度が低下するのを促進することができる。 According to this configuration, since the front end in the traveling direction of the gas blowing portion runs in parallel with the welding torch, oxidation of the welded part is performed by the shielding gas blown out from the front end in the traveling direction of the gas blowing portion in addition to the shielding gas blown out from the welding torch. Can be prevented. In addition, since the rear end of the gas blowing part is advanced so as to be behind the welding torch, the shield gas blown from the range from the front end to the rear end of the gas blowing part is oxidized until the weld bead is cooled. While preventing, it can accelerate | stimulate that the temperature of a weld bead falls.
　ここで、ガス吹出部の進行方向前端を溶接トーチと並走させるとは、ガス吹出部の進行方向前端から吹き出されるシールドガスと、溶接トーチから吹き出されるシールドガスとが、ともに同じ溶接部位に吹き付けられるよう、ガス吹出部及び溶接トーチを位置決めして溶接線の方向に進行させることをいう。 Here, when the front end in the traveling direction of the gas blowing part runs in parallel with the welding torch, the shield gas blown out from the front end in the traveling direction of the gas blowing part and the shield gas blown out from the welding torch are both the same welded part. It means that the gas blowing portion and the welding torch are positioned so as to be blown to the front and advanced in the direction of the weld line.
　また、ブレードを係止リング及び押えリングに溶接する際、ベローズの端部開口を押圧具で塞ぎ、この押圧具からベローズの端部の内周面にシールドガスを吹き出すようにする構成も採用可能である。 Also, when welding the blade to the locking ring and presser ring, it is possible to adopt a configuration in which the end opening of the bellows is closed with a pressing tool, and the shielding gas is blown from the pressing tool to the inner peripheral surface of the end of the bellows. It is.
　この構成によれば、ベローズの端部の内周面にシールドガスを吹き出すので、直接には溶接されないベローズの端部が外周側のブレードを溶接・溶断する際の熱によって酸化するのを防止することができる。しかも、ベローズの端部を押し潰すための押圧具で、ベローズの端部開口を塞ぐと共に、その押圧具からシールドガスを吹き出すので、押圧具を、ベローズの内部からシールドガスが逃げるのを阻止するための蓋、及びシールドガスの吹き出し装置としても兼用することができる。 According to this configuration, since the shielding gas is blown to the inner peripheral surface of the end portion of the bellows, the end portion of the bellows that is not directly welded is prevented from being oxidized by heat when welding and cutting the blade on the outer peripheral side. be able to. In addition, the pressing tool for crushing the end of the bellows closes the end opening of the bellows and blows out the shielding gas from the pressing tool, thereby preventing the shielding gas from escaping from the inside of the bellows. It can also be used as a lid for this purpose and as a shield gas blowing device.
　以上のとおり、本発明によると、押えリングを支持してベローズの端部を押圧するので、１つの工程で、ベローズの端部にパッキン面を形成しつつ、ブレードの端部を形付けすることができる。しかも、ベローズの端部を押圧した状態のまま、ブレードを溶断しながら溶接するので、ブレード端縁の位置合わせを容易にすると共に、ブレードを切断するための金属製可撓管の保持具への着脱を不要にすることができ、ブレードを容易に形付け、切断及び溶接して金属製可撓管を製造することができる。 As described above, according to the present invention, since the end of the bellows is pressed while supporting the presser ring, the end of the blade can be shaped while forming the packing surface on the end of the bellows in one step. Can do. In addition, since the blade is welded while fusing while the end of the bellows is pressed, it is easy to align the edge of the blade and to the metal flexible tube holder for cutting the blade. The attachment and detachment can be eliminated, and the metal flexible tube can be manufactured by easily shaping, cutting and welding the blade.
　また、溶接トーチから吹き出すシールドガスに加えて、別のガス吹出部から吹き出すシールドガスで、溶接部位をガスシールすることにより、溶接ビードが酸化するいわゆる溶接焼けを防止することができ、特に、ブレードを溶断可能な熱で溶接することによる溶接焼けをも防止することができる。これにより、手作業による溶接部のバフ研磨や塗装を不要にして、金属製可撓管の製造をより容易にすることができる。 Further, in addition to the shield gas blown out from the welding torch, the welding part is gas-sealed with a shield gas blown out from another gas blowing part, so that the so-called welding burn in which the weld bead is oxidized can be prevented. It is also possible to prevent welding burns caused by welding with heat that can be melted. This eliminates the need for manual buffing and painting of the welded portion, making it easier to manufacture the metal flexible tube.
本発明に係る製造方法で製造する金属製可撓管を示す図で、右半分は断面図、左半分は側面図The figure which shows the metal flexible tube manufactured with the manufacturing method which concerns on this invention, a right half is sectional drawing, and a left half is a side view 金属製可撓管の正面図で、左半分のみを示す図Figure showing only the left half of the metal flexible tube front view 金属製可撓管の端部を示す拡大図で、右半分は断面図、左半分は側面図It is an enlarged view showing the end of a metal flexible tube, the right half is a cross-sectional view, the left half is a side view 金属製可撓管の端部加工装置の模式図Schematic diagram of metal flexible tube end processing equipment 金属製可撓管を装着した端部加工装置を示す図で、右半分は断面図、左半分は側面図It is a figure which shows the edge part processing device equipped with a metal flexible tube, the right half is a sectional view, the left half is a side view 金属製可撓管の端部を加工する手順を説明する図The figure explaining the procedure which processes the edge part of a metal flexible tube 金属製可撓管の端部を加工する別の形態を示す図The figure which shows another form which processes the edge part of a metal flexible tube
　以下、本発明に係る金属製可撓管の製造方法を実施するための形態について、図面を用いて説明する。まず、本発明に係る製造方法で製造する金属製可撓管の構成について説明する。 Hereinafter, an embodiment for carrying out a method for producing a metal flexible tube according to the present invention will be described with reference to the drawings. First, the configuration of a metal flexible tube manufactured by the manufacturing method according to the present invention will be described.
　図１～図３に示すように、金属製可撓管１は、例えば流体を送る各種管類のフレキシブルジョイントとして用いられるものであり、山部２及び谷部３を交互に繰り返し形成してなるベローズ４と、ベローズ４の外周側を覆うブレード５と、ベローズ４及びブレード５間に介在されてベローズ４の端部の谷部３ａに係止された係止リング６と、係止リング６の外面形状に沿わせるようブレード５の外周面を押える押えリング７とを備え、その端部に他の管に接続するためのフランジ８が係止されている。 As shown in FIGS. 1 to 3, the metal flexible tube 1 is used as, for example, a flexible joint of various pipes for sending a fluid, and is formed by alternately and repeatedly forming peaks 2 and valleys 3. A bellows 4, a blade 5 that covers the outer peripheral side of the bellows 4, a locking ring 6 that is interposed between the bellows 4 and the blade 5 and is locked to the valley 3 a at the end of the bellows 4, A presser ring 7 for pressing the outer peripheral surface of the blade 5 so as to follow the outer surface shape is provided, and a flange 8 for connecting to another pipe is locked to the end portion.
　ベローズ４は、例えばステンレス製で肉厚が０．２ｍｍ～０．３５ｍｍ程度の直管の内側又は外側に荷重を加えて所定間隔ごとに山部２を膨出させることにより、山部２及び谷部３が交互に繰り返し連続する襞付き管構造とされる。ベローズ４の端部は、山部２の一つ分が中心軸方向に押し潰され、ベローズ４の端面に平らなパッキン面９が形成されている。 The bellows 4 is made of stainless steel, for example, by applying a load to the inside or outside of a straight pipe having a thickness of about 0.2 mm to 0.35 mm to cause the peaks 2 to bulge at predetermined intervals. A flanged tube structure in which the portions 3 are alternately repeated continuously is provided. At the end of the bellows 4, one part of the peak portion 2 is crushed in the central axis direction, and a flat packing surface 9 is formed on the end surface of the bellows 4.
　ブレード５は、例えばステンレス製でφ０．３ｍｍ程度の金属線を編成してなる円筒状とされ、ベローズ４を外周側から覆って可撓性を保持しつつ保護するようになっている。ブレード５の中心軸方向の端縁は、係止リング６及び押えリング７に溶接され、ブレード５の中心軸方向への抜け出しが阻止されている。 The blade 5 is made of, for example, a stainless steel cylinder formed by knitting a metal wire having a diameter of about 0.3 mm, and covers the bellows 4 from the outer peripheral side to protect it while maintaining flexibility. The edge of the blade 5 in the central axis direction is welded to the locking ring 6 and the presser ring 7 to prevent the blade 5 from coming out in the central axis direction.
　係止リング６は、例えばステンレス製で５ｍｍ程度の外側辺長を有し、その一片が半径方向で内向きに突出する内向き片６ａとされた断面Ｌ字形のリング状とされる。この係止リング６は、２つ割り構造とされ、ベローズ４の端部を外周側から挟むようにして内向き片６ａを谷部３ａに挿入することにより、ベローズ４の端部に係止される。係止リング６の外周側は、ベローズ４の山部２よりも半径方向で外向きに突出すると共に、ブレード５で覆われ、金属製可撓管１の端部にフランジ８を係止するための段差を形成している。 The locking ring 6 is made of, for example, stainless steel, has an outer side length of about 5 mm, and has a ring shape with an L-shaped cross section, one piece of which is an inward piece 6a protruding inward in the radial direction. The locking ring 6 has a split structure, and is locked to the end portion of the bellows 4 by inserting the inward piece 6a into the valley portion 3a so as to sandwich the end portion of the bellows 4 from the outer peripheral side. The outer peripheral side of the locking ring 6 protrudes outward in the radial direction from the peak 2 of the bellows 4 and is covered with the blade 5 so that the flange 8 is locked to the end of the metal flexible tube 1. The step is formed.
　押えリング７は、例えばステンレス製で０．８ｍｍ程度のリング状の板をプレス加工してなる断面Ｌ字形のリング状とされ、その端縁がブレード５の端縁及び係止リング６の周縁に溶接されている。この押えリング７は、ブレード５の端部を押えて係止リング６の外面形状に沿わせると共に、フランジ８を受ける受け部として機能する。 The presser ring 7 is formed into a ring shape having an L-shaped cross section formed by pressing a ring-shaped plate made of, for example, stainless steel and having a thickness of about 0.8 mm, and the edge thereof is formed on the edge of the blade 5 and the periphery of the locking ring 6. Welded. The presser ring 7 functions as a receiving part for receiving the flange 8 while pressing the end part of the blade 5 so as to follow the outer surface shape of the locking ring 6.
　フランジ８は、例えば鋼製で、金属製可撓管１を貫通させる中央穴を有するドーナツ形の円板とされ、その内周縁の切欠を金属製可撓管１の端部の押えリング７に中心軸方向の中央側から係止して、ボルト孔８ａを貫通するボルトによって他の管に接続するようになっている。 The flange 8 is made of, for example, steel and is a donut-shaped disk having a central hole that penetrates the metal flexible tube 1, and a notch on the inner peripheral edge thereof is formed in the holding ring 7 at the end of the metal flexible tube 1. It is locked from the center side in the central axis direction and is connected to another pipe by a bolt penetrating the bolt hole 8a.
　次に、金属製可撓管１の製造方法を説明する。まず、ベローズ４の外周側にブレード５を配置し、係止リング６をベローズ４及びブレード５間に介在させて、係止リング６の内向き片６ａをベローズ４の端部の谷部３ａに係止し、さらに、押えリング７をブレード５の端部の外周側に配置する。この状態において、ブレード５の端部が係止リング６よりも中心軸方向で外側に突出するよう、あらかじめブレード５の端部に長さの余裕を持たせておく。 Next, a method for manufacturing the metal flexible tube 1 will be described. First, the blade 5 is disposed on the outer peripheral side of the bellows 4, the locking ring 6 is interposed between the bellows 4 and the blade 5, and the inwardly facing piece 6 a of the locking ring 6 is formed in the valley 3 a at the end of the bellows 4. Further, the presser ring 7 is disposed on the outer peripheral side of the end portion of the blade 5. In this state, the end portion of the blade 5 is provided with a margin in advance so that the end portion of the blade 5 protrudes outward in the central axis direction from the locking ring 6.
　次いで、端部加工装置１０を用いて、ベローズ４の端面にパッキン面９を形成すると共に、ブレード５の端部を係止リング６の外面形状に沿わせて形付けし、さらに、ブレード５の端部を係止リング６及び押えリング７に溶接する。 Next, the end surface processing device 10 is used to form the packing surface 9 on the end surface of the bellows 4, and the end portion of the blade 5 is shaped along the outer surface shape of the locking ring 6. The ends are welded to the locking ring 6 and the presser ring 7.
　ここで、金属製可撓管１の端部を加工するための端部加工装置１０について説明する。図４及び図５に示すように、端部加工装置１０は、金属製可撓管１を支持する支持具１１と、ベローズ４の端部を押圧する押圧具１２と、ブレード５の端部を係止リング６及び押えリング７に溶接する溶接トーチ１３と、溶接トーチ１３の吹出孔１３ａから吹き出すシールドガスに加えて追加のシールドガスを吹き出すガス吹出部１４とを備えている。 Here, the end processing apparatus 10 for processing the end of the metal flexible tube 1 will be described. As shown in FIGS. 4 and 5, the end processing device 10 includes a support 11 that supports the metal flexible tube 1, a pressing tool 12 that presses the end of the bellows 4, and an end of the blade 5. A welding torch 13 for welding to the locking ring 6 and the presser ring 7, and a gas blowing portion 14 for blowing additional shielding gas in addition to the shielding gas blowing from the blowing hole 13 a of the welding torch 13 are provided.
　支持具１１は、装置本体１５の開口１６の周縁に支持される断面略正方形のリング状とされ、その中央穴１７に金属製可撓管１の中心軸方向中央部を貫通させつつ、上面側内周縁の切欠１８で押えリング７を受けるようになっている。支持具１１が押えリング７を受けることにより、押えリング７、ブレード５の端部及び係止リング６を介してベローズ４の端部が支持され、金属製可撓管１の全体が支持される。 The support 11 is formed in a ring shape having a substantially square cross section that is supported by the periphery of the opening 16 of the apparatus main body 15, and the central hole 17 penetrates the central portion in the central axis direction of the metal flexible tube 1, and the upper surface The presser ring 7 is received by a notch 18 on the inner peripheral edge. When the support 11 receives the presser ring 7, the end of the bellows 4 is supported via the presser ring 7, the end of the blade 5 and the locking ring 6, and the entire metal flexible tube 1 is supported. .
　押圧具１２は、支持具１１の上方に中心軸を合わせて配置された円柱状とされ、支持棒１９によって上下動自在に支持されている。押圧具１２の直径は係止リング６の外径と同程度に設定され、ブレード５の端部の内側に侵入可能、かつ、ベローズ４の端部開口を塞ぎつつ、ベローズ４の端部を中心軸方向に押圧可能とされる。 The pressing tool 12 is formed in a columnar shape with the central axis aligned above the support tool 11 and is supported by the support bar 19 so as to be movable up and down. The diameter of the pressing tool 12 is set to be approximately the same as the outer diameter of the locking ring 6, can enter the inside of the end of the blade 5, and closes the end opening of the bellows 4 while centering the end of the bellows 4. It can be pressed in the axial direction.
　押圧具１２の中央部下面側には、金属製可撓管１の内側に挿入される小径部２０が設けられ、この小径部２０に、ベローズ４の端部の内周面にシールドガスを吹き出すための複数の吹出孔２１が周方向に間隔をあけて形成されている。ここで、シールドガスには、溶接におけるシールドガスとして従来から用いられているアルゴンガスなどの周知の不活性ガスを使用することができる。 A small-diameter portion 20 that is inserted inside the metal flexible tube 1 is provided on the lower surface side of the central portion of the pressing tool 12, and a shielding gas is blown to the small-diameter portion 20 on the inner peripheral surface of the end portion of the bellows 4. A plurality of outlet holes 21 are formed at intervals in the circumferential direction. Here, well-known inert gas, such as argon gas conventionally used as shielding gas in welding, can be used for shielding gas.
　溶接トーチ１３は、ＴＩＧ溶接に用いられる周知の溶接トーチと同様のものであり、ブレード５の外周側を周方向に移動して、ブレード５の端部を溶断しながら、ブレード５を係止リング６及び押えリング７に溶接するようになっている。この溶接トーチ１３は、ブレード５を溶断できる程度に電流値を高く設定され、付加の溶接棒を用いることなく、ブレード５自体を溶接材料とするようにしている。 The welding torch 13 is the same as a well-known welding torch used for TIG welding, and moves the outer peripheral side of the blade 5 in the circumferential direction so as to melt the end of the blade 5 while locking the blade 5. 6 and the presser ring 7 are welded. The welding torch 13 is set to have a current value high enough to melt the blade 5, and the blade 5 itself is used as a welding material without using an additional welding rod.
　ガス吹出部１４は、その本体に、シールドガスを吹き出すための複数の吹出孔２２を金属製可撓管１の周方向に沿って配列してなり、溶接トーチ１３の移動方向で後方に設けられる。このガス吹出部１４は、進行方向前端の吹出孔２２ａが溶接トーチ１３と並走して進行方向後端の吹出孔２２ｂが溶接トーチ１３よりも遅れるよう、ブレード５の外周側を周方向に移動しながら、追加のシールドガスを吹き出すようになっている。 The gas blowing portion 14 has a plurality of blowing holes 22 for blowing shield gas arranged in the main body along the circumferential direction of the metal flexible tube 1, and is provided rearward in the moving direction of the welding torch 13. . The gas blowing portion 14 moves in the circumferential direction on the outer peripheral side of the blade 5 so that the blowing hole 22a at the front end in the traveling direction runs parallel to the welding torch 13 and the blowing hole 22b at the rear end in the traveling direction is behind the welding torch 13. However, additional shielding gas is blown out.
　次に、端部加工装置１０を用いて金属製可撓管１の端部を加工する手順をより具体的に説明する。 Next, the procedure for processing the end of the metal flexible tube 1 using the end processing apparatus 10 will be described more specifically.
　まず、図６（ａ）に示すように、ブレード５の端部の外周側に位置する押えリング７を支持具１１に掛けて支持する。この状態では、支持具１１に金属製可撓管１の自重のみが作用し、ブレード５を形付けする程度の反力を押えリング７に作用させることなく、金属製可撓管１の全体を支持する。 First, as shown in FIG. 6A, the presser ring 7 located on the outer peripheral side of the end of the blade 5 is hung on the support 11 and supported. In this state, only the weight of the metal flexible tube 1 acts on the support 11, and the entire metal flexible tube 1 is moved without causing a reaction force to shape the blade 5 to act on the holding ring 7. To support.
　次いで、図６（ｂ）に示すように、押圧具１２を下動させてブレード５の端部内側に侵入させ、押圧具１２の小径部２０をベローズ４の端部の内側に挿入する。押圧具１２をさらに下動させて、押圧具１２の下面側周縁部でベローズ４の端部開口を塞ぎつつ、例えば最大６ｋｇ程度の力でベローズ４の端部を中心軸方向に押圧し、ベローズ４の端部の山部２の一つ分を中心軸方向に押し潰して、ベローズ４の端面にパッキン面９を形成する。 Next, as shown in FIG. 6 (b), the pressing tool 12 is moved downward to enter the inside of the end of the blade 5, and the small diameter portion 20 of the pressing tool 12 is inserted inside the end of the bellows 4. The pressing tool 12 is further moved downward to close the end opening of the bellows 4 at the lower peripheral edge of the pressing tool 12, and the end of the bellows 4 is pressed in the central axis direction with a force of, for example, a maximum of about 6 kg. One crest 2 at the end of 4 is crushed in the direction of the central axis to form a packing surface 9 on the end surface of the bellows 4.
　押圧具１２の押圧力は、ベローズ４の端部に係止された係止リング６とブレード５及び押えリング７とを介して、支持具１１に伝えられ、この支持具１１から押えリング７に作用する反力によって、押えリング７がブレード５を押え、ブレード５の端部を係止リング６の外面形状に沿わせるよう形付けする。 The pressing force of the pressing tool 12 is transmitted to the support tool 11 via the locking ring 6 that is locked to the end of the bellows 4, the blade 5, and the pressing ring 7, and from this support tool 11 to the pressing ring 7. The presser ring 7 presses the blade 5 by the reaction force that acts, and the end of the blade 5 is shaped to conform to the outer surface shape of the locking ring 6.
　さらに、ベローズ４の端部を押圧したまま、溶接トーチ１３をブレード５の外周側を周方向に移動させ、ブレード５の端部を溶断しながら、ブレード５の端部を係止リング６及び押えリング７に溶接する。これにより、図６（ｃ）に示すように、ブレード５の端縁が押えリング７の端縁及び係止リング６の周縁に溶接されると共に、ブレード５の端部の余剰部分が除去される。 Further, while the end portion of the bellows 4 is pressed, the welding torch 13 is moved in the circumferential direction on the outer peripheral side of the blade 5, and the end portion of the blade 5 is melted while the end portion of the blade 5 is melted. Weld to ring 7. As a result, as shown in FIG. 6C, the edge of the blade 5 is welded to the edge of the holding ring 7 and the periphery of the locking ring 6, and the excess portion of the edge of the blade 5 is removed. .
　また、ブレード５を係止リング６及び押えリング７に溶接する際、溶接トーチ１３の吹出孔１３ａからシールドガスが吹き出されると共に、ガス吹出部１４が、進行方向前端が溶接トーチ１３と並走して進行方向後端が溶接トーチ１３よりも遅れるようブレード５の周方向に進行する。このガス吹出部１４から溶接部位及び溶接ビードにシールドガスを吹き出すことにより、溶接ビードが酸化を生じない程度に冷却するまでガスシールドする。 Further, when the blade 5 is welded to the locking ring 6 and the presser ring 7, the shield gas is blown out from the blowing hole 13 a of the welding torch 13, and the gas blowing portion 14 is parallel to the welding torch 13 in the traveling direction front end. Then, it advances in the circumferential direction of the blade 5 so that the rear end in the moving direction is delayed from the welding torch 13. By shielding gas from the gas blowing part 14 to the welding site and the welding bead, gas shielding is performed until the welding bead is cooled to an extent that does not cause oxidation.
　また、押圧具１２でベローズ４の端部開口を塞いだ状態で、ベローズ４の端部の内側に挿入した小径部２０の吹出孔２１からベローズ４の端部の内周面にシールドガスを吹き出すことにより、直接に溶接しないベローズ４の内部をガスシールし、ブレード５を溶接する際の熱によってベローズ４の内部が酸化するのを防止する。 Further, in a state where the end opening of the bellows 4 is closed with the pressing tool 12, the shielding gas is blown out from the blowing hole 21 of the small diameter portion 20 inserted inside the end of the bellows 4 to the inner peripheral surface of the end of the bellows 4. As a result, the inside of the bellows 4 that is not directly welded is gas-sealed, and the inside of the bellows 4 is prevented from being oxidized by heat generated when the blade 5 is welded.
　その後、図６（ｄ）に示すように、押えリング７に係止するようフランジ８を装着して、金属製可撓管１の端部の加工が完了する。 Thereafter, as shown in FIG. 6 (d), the flange 8 is mounted so as to be engaged with the presser ring 7, and the processing of the end portion of the metal flexible tube 1 is completed.
　上記構成によれば、押圧具１２でベローズ４の端部を押圧することにより、ベローズ４の端部を押し潰してパッキン面９を形成すると同時に、ブレード５の端部を係止リング６の外面形状に沿わせるよう形付けすることができる。 According to the above configuration, by pressing the end of the bellows 4 with the pressing tool 12, the end of the bellows 4 is crushed to form the packing surface 9, and at the same time, the end of the blade 5 is connected to the outer surface of the locking ring 6. It can be shaped to follow the shape.
　さらに、ベローズ４の端部を押圧したまま、ブレード５の端部を溶断しながら、係止リング６及び押えリング７に溶接するので、一旦、端部加工装置１０から金属製可撓管１を取り外して、手作業でブレード５を切断することなく、ブレード５の端部の余剰部分を除去することができる。これにより、端部加工の工数を少なくすることができると共に、ブレード５を正確な位置で切断することができる。 Furthermore, while the end of the bellows 4 is pressed, the end of the blade 5 is melted and welded to the locking ring 6 and the presser ring 7, so that the metal flexible tube 1 is temporarily removed from the end processing apparatus 10. The excess portion at the end of the blade 5 can be removed without detaching and manually cutting the blade 5. Thereby, the man-hour for the end portion processing can be reduced and the blade 5 can be cut at an accurate position.
　また、溶接トーチ１３の吹出孔１３ａからシールドガスを吹き出すと共に、ガス吹出部１４から追加のシールドガスを吹き出すので、ブレード５を溶断できる程度に溶接トーチ１３の電流値を高めることによる溶接焼けを防止することができる。しかも、ガス吹出部１４からのシールドガスによって、溶接ビードが冷却されるまでの間における溶接焼けをも防止することができるので、溶接焼けに対するバフ研磨や塗装を不要にすることができる。 Further, since the shielding gas is blown out from the blowing hole 13a of the welding torch 13 and the additional shielding gas is blown out from the gas blowing portion 14, the welding burn caused by increasing the current value of the welding torch 13 to the extent that the blade 5 can be melted is prevented. can do. In addition, since the welding gas can be prevented by the shielding gas from the gas blowing portion 14 until the weld bead is cooled, buffing and coating for the welding burn can be eliminated.
　また、シールドガスによって、溶接ビードの冷却を促進することもでき、例えば、溶接完了直後の溶接ビードの表面温度を測定したところ、ガス吹出部１４によるガスシールをしない場合、金属製可撓管１の口径が１５Ａでは１７０℃、口径が５０Ａでは３３２℃であったのに対し、ガス吹出部１４によるガスシールをした場合、口径が１５Ａでは１３１℃、口径が５０Ａでは２０１℃であった。 Further, the cooling of the weld bead can be promoted by the shielding gas. For example, when the surface temperature of the weld bead immediately after the completion of welding is measured, when the gas is not sealed by the gas blowing part 14, the metal flexible tube 1 is used. When the diameter of the gas was 15 A, the temperature was 170 ° C., and when the diameter was 50 A, the temperature was 332 ° C. However, when the gas was sealed by the gas blowing portion 14, the diameter was 131 ° C. when the diameter was 15A and 201 ° C. when the diameter was 50A.
　また、押圧具１２の吹出孔２１からベローズ４の内側に、シールドガスを吹き出すので、直接溶接しないベローズ４がブレード５の溶接熱によって溶接焼けするのを防止することができる。 Further, since the shielding gas is blown out from the blowout hole 21 of the pressing tool 12 to the inside of the bellows 4, it is possible to prevent the bellows 4 that is not directly welded from being burned by the welding heat of the blade 5.
　なお、本発明は、上記の実施の形態に限定されるものではなく、本発明の範囲内において、適宜変更を加えることができる。例えば、金属製可撓管１の端部を加工するのに、支持具１１で押えリング７を受ける代わりに、図７に示すように、フランジ８を利用して押えリング７を受けることもできる。また、ガス吹出部１４や押圧具１２からシールドガスを吹き出すことなく、溶接トーチ１３の吹出孔１３ａのみからシールドガスを吹き出すようにすることもできる。 In addition, this invention is not limited to said embodiment, A change can be suitably added within the scope of the present invention. For example, instead of receiving the presser ring 7 with the support 11 to process the end portion of the metal flexible tube 1, the presser ring 7 can be received using the flange 8 as shown in FIG. . Further, the shielding gas can be blown out only from the blowing hole 13 a of the welding torch 13 without blowing out the shielding gas from the gas blowing portion 14 or the pressing tool 12.
　本発明に係る製造方法は、例えば流体を送る各種管類のフレキシブルジョイントとして用いられる金属製可撓管を製造する方法として好適に採用することができる。 The manufacturing method according to the present invention can be suitably employed as a method for manufacturing a metal flexible tube used as a flexible joint for various pipes for sending fluid, for example.
１　　　金属製可撓管
２　　　山部
３　　　谷部
３ａ　　端部の谷部
４　　　ベローズ
５　　　ブレード
６　　　係止リング
６ａ　　内向き片
７　　　押えリング
８　　　フランジ
８ａ　　ボルト孔
９　　　パッキン面
１０　　端部加工装置
１１　　支持具
１２　　押圧具
１３　　溶接トーチ
１３ａ　吹出孔
１４　　ガス吹出部
１５　　装置本体
１６　　開口
１７　　中央穴
１８　　切欠
１９　　支持棒
２０　　小径部
２１　　吹出孔
２２　　吹出孔
２２ａ　進行方向前端の吹出孔
２２ｂ　進行方向後端の吹出孔 DESCRIPTION OF SYMBOLS 1 Metal flexible pipe 2 Peak part 3 Valley part 3a End valley part 4 Bellows 5 Blade 6 Locking ring 6a Inward piece 7 Pressing ring 8 Flange 8a Bolt hole 9 Packing surface 10 End part processing apparatus 11 Support tool 12 Pressure tool 13 Welding torch 13a Blowout hole 14 Gas blowout part 15 Device main body 16 Opening 17 Central hole 18 Notch 19 Support rod 20 Small diameter part 21 Blowout hole 22 Blowout hole 22a Blowing hole 22b at the front end in the traveling direction Blowing hole at the rear end in the traveling direction

Claims (4)

  1. 　山部及び谷部を交互に繰り返し形成してなるベローズと、該ベローズの外周側を覆う筒状のブレードと、前記ベローズ及び前記ブレード間に介在されて前記ベローズの端部の谷部に係止され、外周側が前記ベローズの山部よりも半径方向で外向きに突出する係止リングと、該係止リングに前記ブレードを介して中心軸方向で中央側から係止され、前記係止リングの外面形状に沿わせるよう前記ブレードの外周面を押える断面Ｌ字形の押えリングとを備え、前記ブレードの中心軸方向の端縁が係止リング及び押えリングに溶接された金属製可撓管を製造する方法であって、
    　前記ベローズの外周側にブレードを配置し、前記係止リングをベローズ及びブレード間に介在させてベローズの端部の谷部に係止し、前記押えリングをブレードの端部の外周側に配置すると共に、前記ブレードの端部を係止リングよりも中心軸方向で外側に突出する長さに設定し、
    　次いで、金属製可撓管を支持する支持具の中央穴に金属製可撓管の中心軸方向中央部を貫通させて前記支持具の上面側内周縁で前記押えリングを受け、前記ベローズの端部を押圧具で中心軸方向に押圧することにより、前記ベローズの端部を中心軸方向に押し潰しつつ、その押圧力を前記係止リング、ブレード及び押えリングを介して前記支持具に伝え、該支持具から押えリングに作用する反力によって押えリングで前記ブレードの端部を押えて、該ブレードの端部を係止リングの外面形状に沿わせるよう形付けし、さらに、前記ベローズの端部を押圧したまま、前記ブレードの端部を溶断して余剰部分を除去しながら、前記ブレードを係止リング及び押えリングに溶接することを特徴とする金属製可撓管の製造方法。     Bellows formed by alternately and repeatedly forming crests and valleys, a cylindrical blade covering the outer peripheral side of the bellows, and interposed between the bellows and the blades and locked to a valley at the end of the bellows A locking ring whose outer peripheral side protrudes outward in the radial direction from the peak portion of the bellows, and is locked to the locking ring from the center side in the central axis direction via the blade. A metal flexible tube comprising a presser ring having an L-shaped cross section that presses the outer peripheral surface of the blade so as to conform to the outer surface shape, and whose edge in the central axis direction of the blade is welded to the lock ring and the presser ring is manufactured. A way to
    A blade is arranged on the outer peripheral side of the bellows, the locking ring is interposed between the bellows and the blade and locked to the valley of the end of the bellows, and the presser ring is arranged on the outer peripheral side of the end of the blade. In addition, the end of the blade is set to a length that protrudes outward in the central axis direction from the locking ring,
    Next, a central hole in the central axial direction of the metal flexible tube is passed through a central hole of the support that supports the metal flexible tube, and the presser ring is received at the inner peripheral edge of the upper surface of the support, and the end of the bellows By pressing the part in the central axis direction with a pressing tool, the end of the bellows is crushed in the central axis direction, and the pressing force is transmitted to the support tool via the locking ring, blade and pressing ring, The end of the blade is pressed by the press ring by a reaction force acting on the press ring from the support, and the end of the blade is shaped to conform to the outer surface shape of the locking ring. A method of manufacturing a metal flexible tube, wherein the blade is welded to the locking ring and the holding ring while the end of the blade is melted and the excess portion is removed while the portion is pressed.
  2. 　前記ブレードを係止リング及び押えリングに溶接する際、溶接トーチからシールドガスを吹き出すと共に、溶接トーチとは別のガス吹出部から溶接部位にシールドガスを吹き出すことを特徴とする請求項１に記載の金属製可撓管の製造方法。 The welding gas is blown out from a welding torch and the shielding gas is blown out to a welding site from a gas blowing part different from the welding torch when the blade is welded to the locking ring and the presser ring. Manufacturing method of metal flexible tube.
  3. 　前記ガス吹出部を進行方向前端が溶接トーチと並走して進行方向後端が溶接トーチよりも遅れるよう進行させ、溶接ビードが酸化を生じない程度に冷却するまでガスシールドすることを特徴とする請求項２に記載の金属製可撓管の製造方法。 The gas blowout part is advanced so that the front end in the traveling direction runs parallel to the welding torch and the rear end in the traveling direction is delayed from the welding torch, and the gas shielding is performed until the welding bead is cooled to an extent that does not cause oxidation. The manufacturing method of the metal flexible tube of Claim 2.
  4. 　前記ブレードを係止リング及び押えリングに溶接する際、前記ベローズの端部開口を前記押圧具で塞ぎ、該押圧具からベローズの端部の内周面にシールドガスを吹き出すことを特徴とする請求項１、２又は３に記載の金属製可撓管の製造方法。 When the blade is welded to the locking ring and the presser ring, the end opening of the bellows is closed with the pressing tool, and shield gas is blown out from the pressing tool to the inner peripheral surface of the end of the bellows. Item 4. The method for producing a metal flexible tube according to Item 1, 2 or 3.
PCT/JP2011/069988 2010-09-06 2011-09-02 Method for producing metallic flexible tube WO2012033008A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6088188U (en) * 1983-11-22 1985-06-17 新日本ラセン管工業株式会社 Flexible tube flange mounting structure
JPH08334192A (en) * 1995-06-07 1996-12-17 Kazuhiko Ida Flexible tube terminal connecting part
JP2002195478A (en) * 2000-12-28 2002-07-10 Tofle Co Inc Flexible tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6088188U (en) * 1983-11-22 1985-06-17 新日本ラセン管工業株式会社 Flexible tube flange mounting structure
JPH08334192A (en) * 1995-06-07 1996-12-17 Kazuhiko Ida Flexible tube terminal connecting part
JP2002195478A (en) * 2000-12-28 2002-07-10 Tofle Co Inc Flexible tube

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