EP1577029A1 - Procédé et dispositif pour augmenter l'épaisseur de l'extrémité d'un tube à paroi mince - Google Patents

Procédé et dispositif pour augmenter l'épaisseur de l'extrémité d'un tube à paroi mince Download PDF

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Publication number
EP1577029A1
EP1577029A1 EP05075634A EP05075634A EP1577029A1 EP 1577029 A1 EP1577029 A1 EP 1577029A1 EP 05075634 A EP05075634 A EP 05075634A EP 05075634 A EP05075634 A EP 05075634A EP 1577029 A1 EP1577029 A1 EP 1577029A1
Authority
EP
European Patent Office
Prior art keywords
tube
supporting
mandrel
supporting body
supporting mandrel
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Withdrawn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
EP05075634A
Other languages
German (de)
English (en)
Inventor
Johannes Willem Tourné
Edwin Wilhelmus Leonardus Mulkens
Dietfried Tresser
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.)
Machinefabriek van de Weert Helmond BV
Original Assignee
Machinefabriek van de Weert Helmond BV
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 Machinefabriek van de Weert Helmond BV filed Critical Machinefabriek van de Weert Helmond BV
Publication of EP1577029A1 publication Critical patent/EP1577029A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles 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
    • B21C37/16—Making tubes with varying diameter in longitudinal direction
    • 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
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/12—Shaping end portions of hollow articles

Definitions

  • the invention relates to a method for increasing the wall thickness of the end of a thin-walled tube, wherein the tube is clamped down near one end, in such a manner that said end of the tube extends freely.
  • the end of the tube is deformed in a direction transversely to the longitudinal direction of the tube in a first step, and in a second step directly following the first step, in which the deformed end of the tube is retained between a supporting mandrel that is inserted into the tube and a supporting body that surrounds the tube, all this in such a manner that the distance between the outer circumference of the supporting mandrel and the inner circumference of the supporting body is greater than the wall thickness of the tube, a pushing force acting in the longitudinal direction of the tube is exerted on the free end of the tube, causing the end of the tube to be deformed in such a manner that the end of the material that forms the tube fills the space between the outer circumference of the supporting mandrel and the inner circumference of the supporting body.
  • a first plasticisation of the material that forms the end of the tube is effected in a first step, which has an advantageous effect on the deformation of the material of the end of the tube in the second step, such that no undesirable wrinkling or the like will take place.
  • a further aspect of the invention relates to a device for carrying out the method according to the invention, which device is provided with a clamping device for clamping down the tube and with a supporting body for surrounding the tube, which clamping device and which supporting body are movable relative to each other in a direction parallel to the central axis of a tube to be clamped down in the clamping device, whilst the device is furthermore provided with a supporting mandrel supported by the supporting body, which is movable with respect to the supporting body in a direction parallel to the central axis of a tube to be clamped down in the clamping device.
  • a simple and robust device can be obtained by means of which the wall thickness of tube ends can be increased in an economically sound manner.
  • Figure 1 is a sectional view of the device according to the invention, in which the upper part of figure 1 shows the various parts of the device in a first position and the lower part of figure 1 shows the various parts of the device in a second position.
  • Figure 2 is a sectional view corresponding to figure 1, in which the upper part of figure 1 shows the various parts of the device in a third position and the lower part of figure 1 shows the various parts of the device in a fourth position.
  • the device that is shown in figure 1 is provided with a clamping device or chuck 1, by means of which a tube 2 can be clamped down. Since such round clamping devices or chucks suitable for clamping down tubes or the like round objects are generally known, they will not be described in more detail herein.
  • the device is furthermore provided with a supporting body 3, which can be moved forwards and backwards by adjusting means (not shown) in the directions indicated by the double arrow A, i.e. parallel to the central axis of a tube 2 that is clamped down in the clamping device 1.
  • a chamber 4 is recessed in the interior of the supporting body, which chamber accommodates a piston 5, in such a manner that the piston 5 can reciprocate in the chamber 4 in the directions indicated by the double arrow A.
  • the end of a supporting mandrel 7 is fixed to the piston 5 by means of a bolt 6.
  • the supporting mandrel 7 extends through a calibrating ring 8, which is accommodated in a supporting ring 10 that is fixed to the supporting body 3 by means of bolts 9.
  • the supporting mandrel 7 has a freely extending end 11, the external diameter of which is smaller than that of the part of the supporting mandrel 7 that is fixed to the piston 5, so that a shoulder 12 is formed at the transition between the two parts. Furthermore, the free end 13 of the thinner part 11 is slightly thickened, in such a manner that first the diameter of said second end 13 gradually increases and then gradually decreases again, with the largest diameter of said second end being at least substantially equal to the internal diameter of the tube 2.
  • auxiliary mandrel 14 may be inserted in the part of the thin walled tube 2 that is clamped down in the clamping device 1 so as to prevent undesirable deformation of the part of the tube 2 that is present in the clamping device 1 when very large upsetting forces are to be exerted on the tube 2.
  • the supporting body 3 and the supporting mandrel 7 are moved to the left, seen in figure 1, to the position that is shown in the lower part of figure 1.
  • the shoulder 12 will abut against the crosscut end 15 of the thin-walled tube 2, so that the supporting mandrel 7 cannot be moved to the left any further, seen in figure 1.
  • the supporting body 3 Upon further movement ahead of the supporting body 3, the supporting body 3 will move with respect to the supporting mandrel 7 and the piston 5 that is fixed thereto, so that the volume of the space 4 located to the right of the piston, seen in figure 1, is reduced.
  • the internal diameter of the calibrating ring 8 has been selected to be slightly smaller than the external diameter of the undeformed thin-walled tube 2.
  • the wall thickness S0 of the undeformed tube 2 is slightly smaller than the distance S1 between the inner circumference of the calibrating ring 8 and the outer circumference of the thinner part 11 of the supporting mandrel 7.
  • the second end 13 of the supporting mandrel 7 will push the second end of the tube 2 in outward direction to the position that is shown in the lower part of figure 2, so that eventually a thin-walled tube 2 is obtained which exhibits a uniform internal diameter along its entire length and which has an end having a wall thickness S2.2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP05075634A 2004-03-17 2005-03-16 Procédé et dispositif pour augmenter l'épaisseur de l'extrémité d'un tube à paroi mince Withdrawn EP1577029A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1025750 2004-03-17
NL1025750A NL1025750C2 (nl) 2004-03-17 2004-03-17 Werkwijze en inrichting voor het vergroten van de wanddikte van het uiteinde van een dunwandige buis.

Publications (1)

Publication Number Publication Date
EP1577029A1 true EP1577029A1 (fr) 2005-09-21

Family

ID=34836861

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05075634A Withdrawn EP1577029A1 (fr) 2004-03-17 2005-03-16 Procédé et dispositif pour augmenter l'épaisseur de l'extrémité d'un tube à paroi mince

Country Status (2)

Country Link
EP (1) EP1577029A1 (fr)
NL (1) NL1025750C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107405675A (zh) * 2015-03-10 2017-11-28 新日铁住金不锈钢株式会社 管的增厚成型方法以及增厚管

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2932889A (en) * 1955-07-20 1960-04-19 United States Steel Corp Pipe upsetting
FR1472178A (fr) * 1966-01-22 1967-03-10 Alsacienne Constr Meca Procédé et dispositif pour la formation d'un renflement intérieur dans une extrémité d'un tube cylindrique de métal, et tubes obtenus
US4040875A (en) * 1975-04-03 1977-08-09 Noble Charles H Ductile cast iron articles
US4192167A (en) * 1978-03-23 1980-03-11 Laeis-Werke Aktiengesellschaft Process and apparatus for upsetting pipe ends
US5379625A (en) * 1993-10-20 1995-01-10 Hale; John Method and apparatus for upsetting the ends of steel pipe
EP0811444A1 (fr) * 1996-06-07 1997-12-10 Sango Co., Ltd. Méthode pour augmenter l'épaisseur de paroie de tubes métalliques
US5743301A (en) * 1994-03-16 1998-04-28 Shaw Industries Ltd. Metal pipe having upset ends

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2932889A (en) * 1955-07-20 1960-04-19 United States Steel Corp Pipe upsetting
FR1472178A (fr) * 1966-01-22 1967-03-10 Alsacienne Constr Meca Procédé et dispositif pour la formation d'un renflement intérieur dans une extrémité d'un tube cylindrique de métal, et tubes obtenus
US4040875A (en) * 1975-04-03 1977-08-09 Noble Charles H Ductile cast iron articles
US4192167A (en) * 1978-03-23 1980-03-11 Laeis-Werke Aktiengesellschaft Process and apparatus for upsetting pipe ends
US5379625A (en) * 1993-10-20 1995-01-10 Hale; John Method and apparatus for upsetting the ends of steel pipe
US5743301A (en) * 1994-03-16 1998-04-28 Shaw Industries Ltd. Metal pipe having upset ends
EP0811444A1 (fr) * 1996-06-07 1997-12-10 Sango Co., Ltd. Méthode pour augmenter l'épaisseur de paroie de tubes métalliques

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107405675A (zh) * 2015-03-10 2017-11-28 新日铁住金不锈钢株式会社 管的增厚成型方法以及增厚管
CN107405675B (zh) * 2015-03-10 2019-08-06 新日铁住金不锈钢株式会社 管的增厚成型方法以及增厚管

Also Published As

Publication number Publication date
NL1025750C2 (nl) 2005-09-20

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