EP0336783A2 - Herstellung eines Gewindes auf einem Rohr - Google Patents

Herstellung eines Gewindes auf einem Rohr Download PDF

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Publication number
EP0336783A2
EP0336783A2 EP89303585A EP89303585A EP0336783A2 EP 0336783 A2 EP0336783 A2 EP 0336783A2 EP 89303585 A EP89303585 A EP 89303585A EP 89303585 A EP89303585 A EP 89303585A EP 0336783 A2 EP0336783 A2 EP 0336783A2
Authority
EP
European Patent Office
Prior art keywords
tube
die assembly
pattern
mandrel
dies
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Withdrawn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
EP89303585A
Other languages
English (en)
French (fr)
Other versions
EP0336783A3 (de
Inventor
Charles Anthony Willetts
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.)
Individual
Original Assignee
Individual
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
Priority claimed from GB888808289A external-priority patent/GB8808289D0/en
Priority claimed from GB888808565A external-priority patent/GB8808565D0/en
Application filed by Individual filed Critical Individual
Publication of EP0336783A2 publication Critical patent/EP0336783A2/de
Publication of EP0336783A3 publication Critical patent/EP0336783A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls
    • B21C37/207—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls with helical guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/56—Making machine elements screw-threaded elements

Definitions

  • This invention relates to a method of and apparatus for producing a thread on a tube.
  • a method of producing a formation on a tube comprising the steps of forcing a surface of the tube against a pattern member having a pattern thereon so as to displace the material of the tube into the pattern to form a formation on the surface of the tube.
  • the formation may comprise a screw-thread or at least one circumferentially extending ring.
  • the depth to width ratio of the formation may be at least 1 : 1.
  • tube we mean hollow or part hollow component which may be of circular or other cross-sectional shape and of constant or varying shape logitudinally thereof, for example, frusto-conical.
  • the method may comprise the steps of forcing an external surface of the tube against the pattern member.
  • the external surface of the tube may be forced against the pattern member by displacing the material of the tube generally outwardly from a longitudinal axis of the tube.
  • the method may further comprise displacing the material of the tube into the pattern by introducing a mandrel into a hollow interior of the tube to swage the tube between the mandrel and the pattern member.
  • the method may include moving a die assembly which constitutes the pattern member between an operative position in which the die assembly is adapted to form a passage which at least partly surrounds the tube, and an inoperative position in which individual dies of the die assembly are spaced mutually apart.
  • the method may comprise moving the die assembly into the operative position to bring about temporary formation of a pattern such as a continuous thread formation or at least one continuous circumferentially extending ring on the inwardly facing wall of the passage.
  • the method may further comprise moving the die assembly into the operative position such that the radially innermost parts of the pattern such as the ridges of thread or ring firmly engage the external surface of the tube.
  • the method may include moving the die assembly between the operative and inoperative positions within a body which houses the die assembly, the movement of the dies being effected by movement of the body, in response to fluid pressure operated means, relative to the die assembly.
  • the method may further comprise actuating further fluid operated pressure means to move the mandrel between a first condition in which it extends into the hollow interior of the tube and a second condition in which it is withdrawn from the interior of the tube, the mandrel being of such dimensions relative to the dimensions of the tube that the introduction of the mandrel into the interior of the tube causes the material of the tube to be displaced outwardly of a longitudinal axis of the tube.
  • the method may comprise the steps of: moving the die assembly to a position in which it forms the passage about the external surface of the tube, introducing the mandrel into the hollow interior of the tube with concomitant displacement of the metal of the tube into the pattern of the die assembly, withdrawing the mandrel from the tube, and moving the die assembly away from the tube.
  • the method may comprise the steps of: placing the tube in the body, moving the body so as to bring the die assembly into the operative position, moving the mandrel from the second condition to the first condition thus displacing the material of the tube into the pattern in the die assembly, moving the mandrel back to the second condition, moving the body so as to bring the die assembly into the inoperative position, and withdrawing the tube.
  • the method may comprise the step of forcing an internal surface of the tube against the pattern member.
  • the method may comprise the step of disposing the pattern member within the tube and moving a die axially of the tube to act on the external surface of the tube to displace the material of the tube into the pattern.
  • the method may comprise steps in which no material is removed from the tube.
  • the surface of the tube may have a coating thereon prior to performing the step of forcing the surface against the pattern member to form the formation.
  • the coating may be a plastics coating such as nylon or other polymer or a metal coating such as an electrolytically deposited zinc.
  • the tube may be made of steel or other metal.
  • apparatus for producing a formation on a metal tube comprising a pattern member having a pattern thereon, and means to force a surface of the tube against the pattern member to form the formation on the surface of the tube.
  • the pattern member may comprise a die assembly which is movable between an operative position in which the die assembly is adapted to form a passage which at least partly surrounds the tube, and an inoperative position in which individual dies of the die assembly are spaced mutually apart.
  • the apparatus may further comprise a mandrel which is adapted to extend into a hollow interior of the tube.
  • the pattern may be provided on the inwardly facing wall of the passage formed collectively by the dies when the die assembly is in the operative position.
  • the formation may be a continuous thread formation or at least one circumferentially extending ring.
  • the formation may be produced by displacement of the material of the tube into the pattern as the tube is swaged between the mandrel and the die assembly when said die assembly is in the operative position.
  • the radially innermost parts of the pattern such as the ridges of the thread may engage the external surface of the tube.
  • the die assembly may be movable within, and relative to, a moveable body, the movement of the body causing movement of the die assembly between the operative and inoperative positions.
  • the body and die assembly may be provided with co-operating cam surfaces whereby movement of the body in a direction parallel to the longitudinal axis of the tube causes movement of the dies generally transverse to said axis.
  • Movement of the body may be accomplished by actuation of fluid pressure operated means.
  • the or each pair of dies constituting the die assembly may have provided therein and acting therebetween resilient biasing means to bias the dies mutually apart such that when the die assembly is not placed in the operative position it tends to assume the inoperative position.
  • the mandrel may be movable between a first condition in which it extends into the hollow interior of the tube and a second condition in which it is withdrawn from the interior of the tube.
  • the mandrel is movable between said first and second conditions by fluid operated pressure means.
  • the mandrel may protrude from and be slidably movable within a hollow cylinder and it may be moved therein between the first and second conditions by fluid pressure acting on surfaces of the mandrel within the cylinder.
  • the mandrel may be of such dimensions relative to the dimensions of the tube that the introduction of the mandrel into the interior of the tube from the second condition causes the material of the tube to be displaced outwardly of a longitudinal axis of the tube.
  • the pattern member may comprise a mandrel assembly, having a pattern part, which may be movable between an inoperative position in which the mandrell is disposed outwardly of the tube and an operative position in which a pattern part of the mandrel is disposed within the tube and a die assembly may be movable between an inoperative position in which the die assembly is disposed axially outwardly of the tube and an operative position in which the die assembly is moved axially of the tube to act on the external surface of the tube to displace the material of the tube into the pattern of the mandrel.
  • the apparatus may be operated in accordance with the method of the first aspect of the invention.
  • the method and apparatus disclosed herein has several advantageous features over methods presently in use including greatly reduced cycle time and greater flexibility for the production different standards of threads.
  • the wall thickness may be reduced compared with that conventionally used to allow for thread cutting.
  • the steel wiring conduit wall thickness is conventionally 1.5mm to 1.6mm thick whilst the present invention permits this wall thickness to be reduced to about 0.9-1.0mm with consequent cost saving, bearing in mind that each tube is typically three metres long.
  • an apparatus 1 for producing a formation comprising a thread on a tube 2 comprises a body 3 in which are housed a pair of dies and 5.
  • the body 3 is provided with an opening 6 into which the tube 2 may be inserted and the opening 6 communicates with an interior well 7 in which are received the dies and 5.
  • the well 7 is frusto-conical having a side wall 8 which diverges away from a longitudinal axis of the tube 2 as the wall and the axis approach a wall 14 which closes a first end of the well 7 and in which wall 14 is formed the opening 6.
  • the dies 4 and 5 are also provided with frusto-conical side walls 4 a , 5 a which co-operate with the side wall 8 of the well.
  • the body 3 is movable, by means hereinafter to be described, relative to the dies 4 and 5 in the direction of the longitudinal axis of the tube 2.
  • Each of the dies 4 and 5 has provided therein, at the middle portion of the face 9, a generally semi cylindrical recess 11a, 11b the longitudinal axes of which, when the die faces 9 are in contact, are coincidental with the longitudinal axis of the frusto-conical walls 4 a , 5 a of the dies.
  • the recesses 11 a , 11 b extend perpendicular to and between parallel end faces 12 and 13 of the dies.
  • the semi cylindrical recesses 11 a , 11 b are each provided thereon with a thread formation and when the faces 9 of the dies 4 and 5 are in mutual contact the semi-cylindrical recesses 11 a , 11 b form a generally cylindrical passage 15 having a continuous thread formation 27 of the wall thereof.
  • the thread formation 27 is of a suitable configuration to provide a pattern for a desired thread to be formed on the tube 2. When the passage 15 is formed moreover, the ridges of the thread formation 27 firmly engage the external surface of the tube 2.
  • the dies 4 and 5 also have provided therein blind bores 16 which extend perpendicular to the faces 9 partly into the body of the or each die.
  • the bores 16 are provided on either side of the semi cylindrical recesses 11 a , 11 b and are equidistant from the longitudinal axis of the passage 15.
  • the bores 16 on the die 4 are aligned with the bores 16 on the die 5 and the aligned bores 16 have provided therein coil compression springs 17 which bear against opposite blind ends of the aligned bores 16 and urge the faces 9 of the dies 4 and 5 mutually apart.
  • each die having provided therein a part cylindrical recess and thread formation, and blind bores for the reception of resilient biasing means so as to provide a die assembly which is adapted to form a generally cylindrical passage analogous to the passage 15 having a continuous thread formation, and the individual dies of which are urged mutually apart by the resilient biasing means.
  • the body 3 has an opening 36 therein which extends from an end 37 of the body which is distant from the wall 14, to the well 7.
  • a cylinder 19 is partly located and fixed within the opening 36, the end wall 39 of the cylinder 19 being flush with the second end wall 10 of the well 7.
  • a mandrel 18 is slidably movable within the cylinder 19.
  • a first region 20 of mandrel 18 is adapted to be introduced into the well 7 of the body and hence into the passage 15 of the die assembly and into the hollow interior of the tube 2 during formation of a thread on the tube.
  • a second region 21 of the mandrel 18 is of greater diameter than the first region 20 and a shoulder 38 is provided at the junction of the two regions which shoulder 38 abuts against the end face 13 of the dies 4 and 5 when the faces 9 of the dies are in mutual contact, to limit the travel of the first region 20 into the passage 15.
  • the second region 21 connects the first region 20 to a third region 22 of the mandrel which forms a fluid tight seal with the internal surface of the cylinder 19.
  • the first, second, and third regions 20, 21 and 22 respectively of the mandrel 18 may be formed as a single member.
  • the mandrel may be moved within the cylinder 19 so as to introduce the first region 20 into the hollow interior of the tube 2 by introduction of fluid into a region 26 behind the third region 22 of the mandrel 15.
  • the second region 21 is of smaller diameter in transverse cross section than the third region 22 and thus there is a clearance 23 between the second region 21 of the mandrel and the cylinder 19.
  • Fluid may be introduced into the region provided by the clearance 23 via conduits 24. Introduction of fluid through the conduits 24 into the clearance space 23 exerts a pressure on the annular shoulder 25 which exists at the junction of the second and third regions 21 and 22 respectively of the mandrel 18, and thus the mandrel is moved in the cylinder 19 in such a manner as to withdraw the first region 20 of the mandrel from the hollow interior of a tube 2 which may be placed in the body 3.
  • the dies 4 and 5 are movable within the well 7 of the body 3 by movement of the body 3 relative to the dies 4 and 5 in response to fluid operated pressure means.
  • the fluid operated pressure means comprises a plurality of individual piston means 28, each of which includes chambers 29 and 30 divided from each other by a piston 31 to which is connected a piston rod 32.
  • the piston rod 32 is further connected to the body 3.
  • Each piston rod 32 is movable in an aperture 33 provided in the wall of the piston means 28, there being a fluid tight seal between the piston rod 32 and the aperture 33.
  • the piston is moved in response to introduction of fluid through a port 34 into the chamber 29 and through a port 35 into the chamber 30.
  • the wall 8 of the well 7 and the walls 4a and 5a of the dies 4 and 5 comprise co-operating cam surfaces whereby movement of the body 3 in a direction parallel to the longitudinal axis of the tube 2 causes movement of the dies 4, 5 generally transverse to said axis.
  • the apparatus is operated according to the following method:
  • the body 3 is in a position such that the first end wall 14 of the body is in contact with the first end 12 of the dies 4 and 5 and the mandrel 18 does not extend into the well 7 of the body 3.
  • a tube 2 is introduced through the opening 6 in the wall 14 of the body 3 and extends into the well 7.
  • the piston means 28 are actuated to move the body 3 relative to the dies 4 and 5 such that the second end wall 10 of the chuck approaches or comes into contact with the end wall 13 of the dies 4 and 5, thus bringing about the concomitant mutual contact of the faces 9 of the dies 4 and 5 and the formation of the generally cylindrical passage 15 which now surrounds and end part of the tube 2.
  • the first region 20 of the mandrel 18 is then introduced into the hollow interior of the tube 2 and is of such dimensions relative to the tube that its introduction therein simultaneously causes displacement of the material of the tube 2 into the thread formation 27 which is located on the surface of the passage 15 surrounding the tube.
  • the body 3 When the mandrel has thus been removed the body 3 is moved to bring about divergence of the dies 4 and 5, which separate due to springs 16 the tube 2 can then be withdrawn from the opening 6 of the body 3 and has a thread formed thereon.
  • FIG. 1 shows the longitudinal axis of the tube lying in a horizontal plane the apparatus could equally well be operated at 90° to such a position such that the tube 2 extends upwardly or downwardly from a vertical opening 6, or indeed in any desired orientation.
  • a thread or other formation may be provided on an internal surface of a tubular member by providing a pattern member internally of the tube, for example a mandrel with a suitably configured surface such as to form a screw thread, and then swaging or otherwise forcing the internal surface of the tubular member into pattern forming engagement with the pattern member.
  • the pattern member is then removed by utilising a collapsible pattern member, or in the case of a screw thread, by unscrewing the pattern member.
  • an apparatus 101 for producing a formation comprising a thread on a tube 102 comprises a die flow collar 103 having an axially extending passage 105 with a counterbored portion 106 at one end.
  • a mandrel 107 mounted within the passage 105 is a mandrel 107 of a diameter to be a snug fit in the main part of the passage 105 and to provide an annular space 108 between the counterbored part 106 and the mandrel 107.
  • the mandrel 107 has a shoulder 109 and a pattern part 110 which is configured to provide a pattern for a desired thread configuration.
  • the tube 102 is held in a clamp 111 and the mandrel 107 and flow collar 103 are moved towards the tube 102 until the shoulder 109 engages the end 112 of the tube 102. This ensures that the longitudinal extent of the thread to be formed in the tube 102 is properly controlled.
  • the flow collar 103 is then forced over the end of the tube 102 thus causing reduction of the outside dimension of the tube 102 and causing the metal to flow into the troughs of the pattern part 110 of the mandrel 107, thereby forming a thread in the bore 113 of the tube 112.
  • the diameter of the counterbored part 106 is predetermined in combination with the internal and external diameters of the tube 102 and the configuration of the part 110 of the mandrel to ensure that correct thread formation is formed.
  • the tube 102 may be initially formed with an enlarged end portion 115 and the mandrel and flow collar 103 correspondingly dimensioned so that after performing the above described method the final tube is of constant external diameter, as illustrated in Figure 9.
  • the tube 102 is of cylindrical internal and external configuration
  • external configuration of the tube may be of other shape, for example, hexagonal or anyother cross-­sectional shape, the flow collar 103 being provided with a bore corresponding to the bore 105 and counterbore part 106 of corresponding configuration.
  • the workpiece in the above described embodiment is a tube, if desired the workpiece may be any component with a tubular part capable of being subjected to a method as hereinbefore described.
  • the flow collar causes the metal to flow to fill the troughs and to flow around the crests of the pattern on the mandrel to give exactly the same technical features of commercial effectiveness which the external threading embodiment described hereinbefore provides.
  • the tube is made of steel provided with a galvanised coating.
  • the tube is intended for use as electrical wiring conduit.
  • the method preserves the galvanised zinc coating so that, in use, corrosion of the threaded portion is avoided which is important in electrical wiring conduit so that electrical conductivity is maintained.
  • the tube may be made of other plastically deformable material and may be coated with any other suitable coating such as nylon or other polymer.
  • the thread may have a root to rib height which is equal to the thread pitch but, if desired, the ratio of thread height to width may be greater than 1 : 1.
  • the tube may be swaged to reduce the diameter of the end of the tube to provide a shoulder to the threaded part thereof.
  • the present invention enables threads to be produced on very much lighter gauges of steel tube than hitherto possible, there is a reduction in labour cost as a result of reducing cycle time.
  • a stronger thread is produced by virtue of the fact that metal has not been removed.
  • the thread or other formation being made solely by metal displacement.
EP19890303585 1988-04-08 1989-04-10 Herstellung eines Gewindes auf einem Rohr Withdrawn EP0336783A3 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB888808289A GB8808289D0 (en) 1988-04-08 1988-04-08 Producing tread on tube
GB8808289 1988-04-08
GB888808565A GB8808565D0 (en) 1988-04-12 1988-04-12 Producing thread on tube
GB8808565 1988-04-12

Publications (2)

Publication Number Publication Date
EP0336783A2 true EP0336783A2 (de) 1989-10-11
EP0336783A3 EP0336783A3 (de) 1990-11-22

Family

ID=26293755

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890303585 Withdrawn EP0336783A3 (de) 1988-04-08 1989-04-10 Herstellung eines Gewindes auf einem Rohr

Country Status (2)

Country Link
EP (1) EP0336783A3 (de)
GB (1) GB2220160A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004004233A1 (de) * 2004-01-27 2005-08-18 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Verfahren und Vorrichtung zur Herstellung einer Dehnschraube und Dehnschraube

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001276956A (ja) * 2000-03-30 2001-10-09 Somic Ishikawa Inc ボールジョイントおよびそのハウジングの製造方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US638962A (en) * 1899-07-01 1899-12-12 Salomon Frank Swaging screw-threads.
US2862215A (en) * 1954-07-13 1958-12-02 Red Lion Cabinet Company Machine for forming threads within a metallic tube by swaging
FR1187602A (fr) * 1950-06-16 1959-09-14 Procédé de filetage intérieur ou extérieur pour tubes
EP0187623A1 (de) * 1985-01-10 1986-07-16 Urs Kellner Vorrichtung zum Kaltpressen eines konischen Gewindes

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3006003A (en) * 1959-04-15 1961-10-31 United Carr Fastener Corp Method of swaging interrupted threads in a sheet metal nut
FR82239E (fr) * 1962-09-05 1964-01-10 Procédé de filetages sur tubes par déformation de la matière
US3566651A (en) * 1968-10-03 1971-03-02 Fellows Gear Shaper Co Method and apparatus for forming internally profiled tubular parts by material displacement
GB1359096A (en) * 1972-03-15 1974-07-10 Praga Automobilove Z Narodni P Method and device for providing a locking in gearings of shift sleeves

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US638962A (en) * 1899-07-01 1899-12-12 Salomon Frank Swaging screw-threads.
FR1187602A (fr) * 1950-06-16 1959-09-14 Procédé de filetage intérieur ou extérieur pour tubes
US2862215A (en) * 1954-07-13 1958-12-02 Red Lion Cabinet Company Machine for forming threads within a metallic tube by swaging
EP0187623A1 (de) * 1985-01-10 1986-07-16 Urs Kellner Vorrichtung zum Kaltpressen eines konischen Gewindes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004004233A1 (de) * 2004-01-27 2005-08-18 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Verfahren und Vorrichtung zur Herstellung einer Dehnschraube und Dehnschraube
DE102004004233B4 (de) * 2004-01-27 2006-02-16 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Verfahren und Vorrichtung zur Herstellung einer Dehnschraube und Dehnschraube
DE102004004233C5 (de) * 2004-01-27 2012-07-19 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Verfahren und Vorrichtung zur Herstellung einer Dehnschraube

Also Published As

Publication number Publication date
GB8908025D0 (en) 1989-05-24
GB2220160A (en) 1990-01-04
EP0336783A3 (de) 1990-11-22

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