EP0353324A1 - Procédé d'étirage droit de tubes et dispositif à cet effet - Google Patents

Procédé d'étirage droit de tubes et dispositif à cet effet Download PDF

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Publication number
EP0353324A1
EP0353324A1 EP88112596A EP88112596A EP0353324A1 EP 0353324 A1 EP0353324 A1 EP 0353324A1 EP 88112596 A EP88112596 A EP 88112596A EP 88112596 A EP88112596 A EP 88112596A EP 0353324 A1 EP0353324 A1 EP 0353324A1
Authority
EP
European Patent Office
Prior art keywords
indentation
mandrel
tube
pulling
nozzle
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.)
Granted
Application number
EP88112596A
Other languages
German (de)
English (en)
Other versions
EP0353324B1 (fr
Inventor
Karl-Heinz Komp
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.)
Schumag AG
Original Assignee
Schumag AG
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 Schumag AG filed Critical Schumag AG
Priority to DE8888112596T priority Critical patent/DE3872231D1/de
Priority to EP88112596A priority patent/EP0353324B1/fr
Priority to JP63329531A priority patent/JPH0246910A/ja
Priority to FI893420A priority patent/FI98132C/fi
Priority to US07/387,861 priority patent/US4962658A/en
Publication of EP0353324A1 publication Critical patent/EP0353324A1/fr
Application granted granted Critical
Publication of EP0353324B1 publication Critical patent/EP0353324B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/32—Feeding or discharging the material or mandrels
    • 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
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
    • B21C1/24—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles by means of mandrels

Definitions

  • the invention relates to a method for pulling a pipe straight in at least two stages over a number corresponding to the number of drawing stages of the mandrels located in the interior of the tube, each mandrel in the drawing direction in front of the next drawing nozzle but behind the mandrel assigned to this drawing nozzle into the tube indentation is brought into the pulling position.
  • the invention relates to a device for performing the method.
  • the invention is therefore based on the object of proposing a method of the type described at the outset which enables a simpler mandrel structure, creates more space for the indentation device and nevertheless enables a shorter hollow pull. Furthermore, a device for carrying out the method is to be proposed.
  • This object is achieved according to the invention in a method of the type described in the introduction in that the desired number of mandrels is introduced independently of one another into the initial region of the tube before the start of drawing in such a way that it begins with the drawing between a drawing bar and one behind the last and largest mandrel Indentation introduced into the tube are arranged, whereupon during the subsequent drawing process the remaining mandrels with the drawn part are transported further and in the area of the tube wall thickness emerging from the respective nozzle, but with a reduced thickness, but as close as possible behind the last mandrel, which is the previous nozzle happened, each further indentation is made.
  • the mandrels are no longer releasably connected to one another, but have no connection at all. They just lie loosely in the pipe in the right order one after the other. Then, in a manner known per se, except for the last largest mandrel, all the mandrels are transported through the largest drawing nozzle, whereupon the largest mandrel is pulled into the drawing position by the dent located behind it in the pipe, thereby reducing the pipe wall thickness in its drawing position. However, the mandrels preceding the largest mandrel no longer remain in an unchanged position relative to this largest mandrel during the drawing process, but rather move unhindered with the part which has undergone a change in diameter but no change in wall thickness.
  • the method according to the invention it is possible to pull a tube with a work result known per se, but to use simpler mandrels, to reduce the necessary hollow drawing length and to make space for an indentation device.
  • the last point in particular proves to be particularly important because the indentation device can now be designed in such a way that the actual indentation bolt can move with the surface movement of the workpiece in a suitable manner, so that on the one hand a standstill of the drawing process for introducing the dent is not necessary, on the other hand, the risk of cracking of the workpiece can be avoided in conventional detaching under pulling speed.
  • a device for carrying out the method according to the invention with at least two successive drawing nozzles and at least one indentation device for each drawing nozzle is characterized in that each drawing nozzle is assigned an independent drawing mandrel and, in the drawing direction downward, a Dell device with at least one Dell tool, which latter is so It is controlled that a dowel pin is actuated at the earliest when the hollow traction area of the workpiece, which is not reduced in the wall thickness of the workpiece, has passed the tool.
  • a tube 1 is shown schematically at the beginning of the drawing process.
  • a drawing bar 9 is formed, which has already been passed through the drawing nozzle 6.
  • the mandrels 2, 3 and 4 are inserted one after the other in the tube as completely loose and independent pieces.
  • An indentation 10 is provided behind the largest mandrel 2. The mandrels get smaller and smaller in the pulling direction.
  • tube 1 is now pulled in the direction of drawing 5 via the drawing bar 9, the mandrels 3 and 4 migrate unhindered through the drawing nozzle 6, while tube 1 is simultaneously reduced in its diameter but not in its wall thickness.
  • Straight pulling machines with intermittent pulling carriages 20 are well known and do not require further explanation here.
  • FIG. 7 the drawing nozzle 7 is shown schematically in a side view of such a straight-line drawing machine 19 with a start of the tube 1 with the drawing bar 9 that has already passed through the drawing nozzle 7.
  • the drawing slide 20 grips the drawing bar 9 and pulls the tube 1 in the drawing direction 5 through the drawing stroke 13 through the Drawing nozzle 7. This process is known and therefore need not be explained further here.
  • an indentation device 14 can be moved radially to the workpiece 1 in straight guides 23, displaceable by a drive device 24, designed as a hydraulic cylinder, in the direction of arrow 22.
  • This indentation device 14 has a lifting head 21 on the side facing the workpiece 1, on which Dell tools 15 and 16 are pivotally mounted on the side facing the workpiece 1 about the axes 25 and 26 running parallel to one another.
  • the swiveling movement can in this case be carried out by a swivel drive 30 designed as a hydraulic cylinder via a corresponding lever, which is connected to the swivel axis 25 and is not designated in any more detail.
  • a toothed ring segment 28 is provided on the upper side of the lifting head 21, which meshes with a toothed ring segment 29, which is connected to the swivel axis 26 in a rotationally fixed manner.
  • a pivoting movement of the ring gear segment 28 is thus transmitted in the opposite direction of rotation to the ring gear segment 29 and thus in each case to the Dell tools 15 and 16, which thus move in the opposite arrangement and in each case in the opposite direction of rotation.
  • the Dell tools 15 and 16 have dent pins 17 and 18 on their side facing the workpiece 1, which, when pivoted to such an extent that they lie on a straight line through the two pivot axes 25 and 26, have such a distance with their tips, which is smaller than the outer diameter of the workpiece 1 arriving there, so that they make a corresponding indentation on the workpiece 1 there.
  • the indentation as such is carried out during the first pulling-in stroke just mentioned and before the end of the pulling-in stroke in such a way that when the pulling slide 20 has moved sufficiently far in the pulling direction 5, the denting device 14, driven by the drive device 24, radially towards the workpiece 1 is driven into the working position.
  • the pivot drive 30 has then pivoted the Dell tools 15 and 16 as shown in FIG. 11.
  • FIGS. 9 to 11 the respective ring gear segment 28 or 29 is shown in FIGS. 9 to 11 as if it were arranged on the underside of the lifting head 21.
  • the ring gear segments 28 and 29 are preferably arranged on the top of the lifting head 21, as shown in FIG. 8 and thus invisible in FIGS. 8 to 11.
  • FIG. 7 shows no Dell tool 15 or 16 on the underside of the lifting head 21. The arrangement is clear from Figure 8 and Figures 9 to 11.
  • the denting device 14 has now been moved into the working position as described, the workpiece 1 and the Dell tools 15 and 16 assume a relative position to one another, as can be seen in FIG. 11.
  • the workpiece 1 is now moved in the direction of drawing 5 and at the same time the Dell tools 15 and 16 are pivoted by a corresponding actuation of the swivel drive 30 so that the dent bolts 17 and 18 have a peripheral speed which corresponds to the drawing speed of the workpiece 1 in the direction of drawing 5.
  • the dent pins 17 and 18 then move towards the surface of the workpiece 1 and thus dent the workpiece 1 in a position as shown in FIG. 10.
  • This arrangement according to FIG. 10 is shown in a different view in FIG. 8.
  • the indentation device or at least the lifting head of the indentation device can be moved in straight guides from a drive device towards and away from the workpiece.
  • This is a simple and armored construction that allows for accurate and rapid movement and positioning.
  • a pivoting movement of the lifting head would also be possible.
  • the ring gear segments with which the rotary movement of the Dell tools is coordinated, provide a simple means of ensuring that a correct sequence of movements of the indenting tools is achieved. At the same time, this eliminates the need for a second rotary actuator and the coordination measures that are then required.
  • the swivel drive itself can be made very weak because the indentation force can be generated by the retracting movement of the workpiece.
  • the invention is of course not limited to the use of three drawing nozzles but can just as well be carried out with more or fewer drawing nozzles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
EP88112596A 1988-08-03 1988-08-03 Procédé d'étirage droit de tubes et dispositif à cet effet Expired - Lifetime EP0353324B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE8888112596T DE3872231D1 (de) 1988-08-03 1988-08-03 Verfahren zum geradeausziehen von rohren und einrichtung zur durchfuehrung des verfahrens.
EP88112596A EP0353324B1 (fr) 1988-08-03 1988-08-03 Procédé d'étirage droit de tubes et dispositif à cet effet
JP63329531A JPH0246910A (ja) 1988-08-03 1988-12-28 管の引抜き方法及びその装置
FI893420A FI98132C (fi) 1988-08-03 1989-07-14 Menetelmä putken suoravetämiseksi ja menetelmän suorittamiseen tarkoitettu laite
US07/387,861 US4962658A (en) 1988-08-03 1989-07-31 Method and apparatus for straight drawing a pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88112596A EP0353324B1 (fr) 1988-08-03 1988-08-03 Procédé d'étirage droit de tubes et dispositif à cet effet

Publications (2)

Publication Number Publication Date
EP0353324A1 true EP0353324A1 (fr) 1990-02-07
EP0353324B1 EP0353324B1 (fr) 1992-06-17

Family

ID=8199173

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88112596A Expired - Lifetime EP0353324B1 (fr) 1988-08-03 1988-08-03 Procédé d'étirage droit de tubes et dispositif à cet effet

Country Status (5)

Country Link
US (1) US4962658A (fr)
EP (1) EP0353324B1 (fr)
JP (1) JPH0246910A (fr)
DE (1) DE3872231D1 (fr)
FI (1) FI98132C (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0615794A1 (fr) * 1993-02-27 1994-09-21 KM Europa Metal Aktiengesellschaft Procédé pour fabriquer une chambre de mandrin pour le filage en cascade de tubes et dispositif pour sa mise en oeuvre
US5533376A (en) * 1993-08-20 1996-07-09 Schumag Ag Method for preparing a tubular blank having a thick wall for a following cascade drawing operation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5136990B2 (ja) * 2008-12-03 2013-02-06 新日鐵住金株式会社 フローティングプラグを用いた超薄肉継目無金属管の製造方法
CN105499289B (zh) * 2016-01-07 2018-04-20 山东亨圆铜业有限公司 一种防碰撞游动芯头

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2155437A (en) * 1937-10-12 1939-04-25 Aluminum Co Of America Tube drawing method
DE2623385C2 (de) * 1976-05-25 1984-03-15 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover Verfahren zum Einbringen von Dornen in eine zu ziehende Rohrlänge
EP0153495A2 (fr) * 1984-02-17 1985-09-04 Schumag Aktiengesellschaft Procédé d'étirage d'un tuyau métallique sans soudure

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2600254A (en) * 1947-03-20 1952-06-10 Lysobey John Wall treatment of tubing
DE2131874C3 (de) * 1971-06-26 1984-07-19 Benteler-Werke Ag, 4794 Schloss Neuhaus Vorrichtung zum Reduzieren von Rohrsträngen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2155437A (en) * 1937-10-12 1939-04-25 Aluminum Co Of America Tube drawing method
DE2623385C2 (de) * 1976-05-25 1984-03-15 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover Verfahren zum Einbringen von Dornen in eine zu ziehende Rohrlänge
EP0153495A2 (fr) * 1984-02-17 1985-09-04 Schumag Aktiengesellschaft Procédé d'étirage d'un tuyau métallique sans soudure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0615794A1 (fr) * 1993-02-27 1994-09-21 KM Europa Metal Aktiengesellschaft Procédé pour fabriquer une chambre de mandrin pour le filage en cascade de tubes et dispositif pour sa mise en oeuvre
US5467631A (en) * 1993-02-27 1995-11-21 Km-Kabelmetal Ag Method for manufacturing a plug-type chamber used in the cascade drawing of tubes, and device for implementing the method
US5533376A (en) * 1993-08-20 1996-07-09 Schumag Ag Method for preparing a tubular blank having a thick wall for a following cascade drawing operation

Also Published As

Publication number Publication date
FI893420A0 (fi) 1989-07-14
EP0353324B1 (fr) 1992-06-17
US4962658A (en) 1990-10-16
FI893420A (fi) 1990-02-04
FI98132B (fi) 1997-01-15
FI98132C (fi) 1997-04-25
JPH046447B2 (fr) 1992-02-05
JPH0246910A (ja) 1990-02-16
DE3872231D1 (de) 1992-07-23

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