US3568489A - Methods and apparatus for producing corrugated metal tubes - Google Patents

Methods and apparatus for producing corrugated metal tubes Download PDF

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Publication number
US3568489A
US3568489A US752044A US3568489DA US3568489A US 3568489 A US3568489 A US 3568489A US 752044 A US752044 A US 752044A US 3568489D A US3568489D A US 3568489DA US 3568489 A US3568489 A US 3568489A
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corrugating
tube
corrugations
tool
metallic tube
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US752044A
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English (en)
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Susumu Tobita
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D15/00—Corrugating tubes
    • B21D15/04—Corrugating tubes transversely, e.g. helically

Definitions

  • the present invention relates to methods and apparatus for producing corrugations in metallic tubes and is characterized by the fact that it is possible to produce corrugations of various shapes by utilizing at least two corrugating rings or two sets of corrugating rolls.
  • the invention relates to methods and apparatus capable of producing easily corrugations of greater depth as compared with pitch, corrugations of a small pitch whose trough is wider than the crest (tubes with such corrugations have good bending characteristics and other mechanical properties and permit a cable to be pulled into them more easily), and furthermore corrugations conformable to the shapes of apexes of corrugating rings or rolls, without employing any core (corrugating tool to be applied inside the tube) as in the conventional apparatus.
  • the present invention relates to methods and apparatus for producing corrugations in metallic tubes, and in particular proposes methods and apparatus capable of producing easily corrugation of greater depth as compared with pitch, corrugation of a small pitch whose trough is wider than the crest, and furthermore corrugation along shapes of apexes of corrugating rings or rolls without employing any core as in the conventional apparatus.
  • the first is a method of corrugating by pressing a corrugating tool only against the exterior of a metallic tube
  • the second is a method of corrugating by pressing a corrugating tool against the exterior of a metallic tube and simultaneously inserting also another corrugating tool (core) into the tube, thus nipping the tube wall between the two tools.
  • core corrugating tool
  • the second method in which the corrugating force is applied not only to the exterior of a metallic tube, but also to its interior by utilizing a core.
  • this method is impracticable for producing corrugations on cavity-filled tube, such as cable sheath having cable core, in which there is no room for the core to be inserted.
  • the present invention provides a new method for corrugating a metallic tube which is free from the defects of the above conventional corrugating methods.
  • the first purpose of the present invention is to obtain sharply corrugated metallic tubes by applying force only against the exterior of tubes without employing a core.
  • the second purpose of the present invention is to obtain corrugated metallic tubes in which despite a small pitch of corrugation, the trough is wider than the crest.
  • the third object of the present invention is to propose a method suitable for producing metallic tubes corrugated as above in a continuous length, that is to say, a method of corrugating tubes by at least two corrugating rings or two sets of rolls.
  • the fourth object of the present invention is to propose a method for producing corrugation of shapes conformably to the shape of apexes of corrugating rings or rolls.
  • the fifth object of the present invention is to propose a method of producing efficiently and at low cost corrugated tubes of various shapes, having good mechanical characteristics, which is convenient for the production of many different sizes of corrugated tubes.
  • the present invention provides methods and apparatus of producing a corrugated tube by pressing a corrugating tool against the exterior of a metallic tube, in which a plurality of corrugating tools are arranged in such a manner that their inner surfaces, which engage the tube, will come on the whole or part of the peripheries of the circles satisfying the conditions,
  • the planes of the circles corresponding to adjacent corrugating tools are fiat, and said planes have different inclination angles respectively to the plane perpendicular to the central axis of a metallic tube to be corrugated, the inclination angle of the circle corresponding to a front one of said adjacent corrugating tools being preselected to be algebraically smaller than the inclination angle of the circle corresponding to a rear one of said corrugating tools, and
  • FIG. 1 A block diagram illustrating an exemplary computing environment in accordance with the present invention.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in accordance with the present invention.
  • FIG. 1 is a diagram for illustrating a conventional corrugating method.
  • FIG. 2 is a diagram for illustrating the fundamental principle of the present invention.
  • FIGS. 3a and b are vertical and transverse sectional views in which a portion is omitted and which show the first embodiment of the present invention respectively.
  • FIGS. 4a and b are vertical and transverse sectional views in which a portion is omitted and which show the second embodiment of the present invention.
  • FIGS. 5, 6 and 7 are diagrams for illustrating the theory of the present invention respectively.
  • FIG. 8 is a vertical sectional view, in which a portion is omitted and which shows the third embodiment of the present invention.
  • FIG. 9 is a diagram for explaining the principle of the fourth embodiment of the present invention.
  • FIGS. 10a and b are diagrams of corrugation of a metallic tube corrugated by the method of the present invention and
  • FIGS. 11a and b are diagrams of a metallic tube corrugated by methods of the present invention and
  • the force F is applied in the radial direction to the exterior of metallic tube 2 and simultaneously the force F in the axial direction of the tube, whereby forming corrugations in such a manner as if to pinch the wall 4 of a pipe.
  • the force F is applied in the radial direction to the exterior of metallic tube 2 and simultaneously the force F in the axial direction of the tube, whereby forming corrugations in such a manner as if to pinch the wall 4 of a pipe.
  • FIG. 2b because it is possible to apply the force F along the axial direction of a pipe even though the width w of the apex of a corrugating tool 3 is large, it is possible to produce easily corrugations having a large depth h whose trough is wider than the crest.
  • the present invention is based on my findings that a metallic pipe is easily deformed when the force is applied to the axial direction as well as in the radial direction. This may be due to the fact that any metal material, which is in its plastic region owing to a force given it in one direction. is easily deformed when additionally given even a slight force in a different direction.
  • FIGS. 3a and b is a metallic tube to be corrugated, 6 the inside surface of the root of a corrugated metallic tube, and 7 a bush.
  • the metallic tube 5 is sent out in the direction of the arrow in FIG. 3a.
  • 8, 9 are corrugating tools of ring shape. Their inside surfaces contacting with the tube are situated on the peripheries of circles 11 and 12. Circles 11 and 12 are as follows.
  • the adjacent corrugating tools 8 and 9 as described above are caused to rotate about the central axis 10 of a metallic tube 5 at the same speed and in the same direction by driving gear (not shown), and thereby a metallic tube 5 is pressed by the tool on its exterior and corrugated spirally. In this way the force in the axial direction is further applied by the front tool 9 to the corrugations formed by the rear tool 8, thereby easily producing sharp corrugations or corrugations whose trough is wider than the crest.
  • FIG. 4 shows corrugating tools 13 and 14 comprising a plurality of rolls and in this case the apexes of the rolls contacting with 4 a metallic tube are situated on the peripheries of circles 15 and 16 similar to 11 and 12 of FIG. 3b.
  • an inner surface of a corrugating ring is arranged on the periphery of a circle of a radius R,, and inclined at an angle of relative to a plane perpendicular to a central axis 18 of a metallic tube 17 of a radius R to be corrugated as shown in FIG. 5.
  • the center O is eccentric from H to a point, O on a central axis 18 of a metallic tube, and the said corrugating tool is rotated about a central axis 18, while the inclination and eccentric distance H are maintained to produce spiral corrugations on a metallic tube 17.
  • the axial displacement shown by the locus 20 of the apex 22 of the rear corrugating tool 21 is larger than that shown by the locus 23 of the apex of a front corrugating tool 24. Therefore if, as a metallic tube 17 is travelled in the direction of arrow at a constant speed, adjacent corrugating tools 21 and 24 are rotated about the central axis of the tube in the same direction and at the same speed while the above inclination and eccentric distance are maintained, the speed at which the tube passes rear tool 21 is higher than that at which it passes the front tool 24 by which the force is applied to corrugations formed by rear tool 21 in the direction of tube axis to reduce the pitch of corrugations to an extent corresponding to the difference between the two speeds.
  • FIG. 6 show the process of corrugating a metallic tube, by Way of a line on the circumference of the tube and in parallel to its axis (at top part of the tube in the figure).
  • the corresponding positions on the outside surface of a metallic tube are represented by marks II, III, IV
  • a tool 24 is situated at a position a certain point on the surface of a metallic tube lying nearly under the tool 24 is represented by I, and when the tool 24 moved to positions Supposing that at this time, a tool 24 is for example at a position position but a point I on a metallic tube lying in the vicinity of the tool 24 moves merely to II because its displacement in the axial direction of the tube is small.
  • the tool 24 performs braking action which prevents the progress of a metallic tube and in other words the force reverse to the direction of progress of a metallic tube is applied.
  • phase difference is the angle formed by a line between 0,
  • FIG. a shows a case were the depressive force is applied only by the rear ring and only the force in the axial direction of a tube is applied by the front ring.
  • Sharp corrugations are produced by the pinching-up effect, but the contour of one side of a corrugation is different from that of the other side (not symmetrical), so that the corrugation does not conform to the shape of the apex of a corrugating ring.
  • a corrugated tube referred to in the present invention includes a corrugated sheath of an electric cable in addition to a non-filled corrugated tube.
  • the material of the corrugating tools used in the present invention is not limited to metals. Plastics or any other material may be used for them. Moreover the tools may take any other shape than ring or roll.
  • FIG. 11 shows a corrugation a produced in a metallic tube according to the present invention and FIG. 11 also shows a corrugation b produced according to the conventional method in which the force is applied only in the radial direction of a metallic tube.
  • corrugations made by only one corrugating tool as in the conventional method are shallow and gently sloping and the resultant corrugated tube has unsatisfactory bending characteristic.
  • the present invention it is possible to produce deeply and sharply corrugated tubes having good bending characteristics.
  • a method of producing a corrugated metallic tube comprising the step of pressing from the external side of a metallic tube by means of a plurality of adjacent corrugating tools, said pressing step including disposing the portions of said corrugating tools to be brought into contact with the metallic tube at the peripheries of circles satisfying the following conditions:
  • the planes of the circles corresponding to the adjacent corrugating tools are flat, and said planes have different inclination angles respectively to the plane perpendicular to the central axis of a metallic tube to be corrugated, the inclination angle of the circle corresponding to a front one of said adjacent corrugating tools being preselected to be algebraically smaller than the inclination angle of the circle corresponding to a rear one of said corrugating tools, and
  • An apparatus for producing a corrugated metallic tube comprising a pair of adjacent corrugating tools, the portions of said corrugating tools to be brought into contact with a metallic tube for pressing the exterior of the metallic tube being disposed respectively at the peripheries of circles satisfying the following conditions:
  • the planes of the circles corresponding to the adjacent corrugating tools are tlat, and said planes have dilferent inclination angles respectively to the plane perpendicular to the central axis of a metallic tube to be corrugated, with the inclination angle of the circle corresponding to the front one of the corrugating tools being preselected to be algebraically smaller than the inclination angle of the circle corresponding to the rear one of said corrugating tools, and

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
US752044A 1967-08-14 1968-08-12 Methods and apparatus for producing corrugated metal tubes Expired - Lifetime US3568489A (en)

Applications Claiming Priority (1)

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JP5209967 1967-08-14

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US3568489A true US3568489A (en) 1971-03-09

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US (1) US3568489A (ru)
DE (1) DE1752954A1 (ru)
FR (1) FR1577636A (ru)
GB (1) GB1232068A (ru)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916504A (en) * 1973-10-02 1975-11-04 Universal Oil Prod Co Method of making spiral tube mixing device
US4339936A (en) * 1980-11-03 1982-07-20 Uop Inc. Annular corrugator
US6230363B1 (en) * 1996-05-14 2001-05-15 Suiden Co., Ltd. Large-scale cleaning vehicle

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
YU42981A (en) * 1980-08-02 1983-09-30 Kabel Metallwerke Ghh Device for transforming even tubes to wave-shaped tubes
DE102009024847B4 (de) * 2009-06-09 2012-01-26 Brugg Rohr Ag, Holding Vorrichtung zur Herstellung wendelförmiger Wellrohre

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916504A (en) * 1973-10-02 1975-11-04 Universal Oil Prod Co Method of making spiral tube mixing device
US4339936A (en) * 1980-11-03 1982-07-20 Uop Inc. Annular corrugator
US6230363B1 (en) * 1996-05-14 2001-05-15 Suiden Co., Ltd. Large-scale cleaning vehicle

Also Published As

Publication number Publication date
FR1577636A (ru) 1969-08-08
DE1752954A1 (de) 1971-04-15
GB1232068A (ru) 1971-05-19

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