EP0153495B1 - Verfahren zum Ziehen eines nahtlosen Metallrohres - Google Patents

Verfahren zum Ziehen eines nahtlosen Metallrohres Download PDF

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Publication number
EP0153495B1
EP0153495B1 EP84116298A EP84116298A EP0153495B1 EP 0153495 B1 EP0153495 B1 EP 0153495B1 EP 84116298 A EP84116298 A EP 84116298A EP 84116298 A EP84116298 A EP 84116298A EP 0153495 B1 EP0153495 B1 EP 0153495B1
Authority
EP
European Patent Office
Prior art keywords
tube
mandrels
dies
metal tube
drawing 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.)
Expired
Application number
EP84116298A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0153495A3 (en
EP0153495A2 (de
Inventor
Klaus Peter Dipl.-Ing. Uhlmann
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 AT84116298T priority Critical patent/ATE36127T1/de
Publication of EP0153495A2 publication Critical patent/EP0153495A2/de
Publication of EP0153495A3 publication Critical patent/EP0153495A3/de
Application granted granted Critical
Publication of EP0153495B1 publication Critical patent/EP0153495B1/de
Expired 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
    • B21C1/22—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
    • 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
    • B21C5/00—Pointing; Push-pointing
    • 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
    • B21C5/00—Pointing; Push-pointing
    • B21C5/003—Pointing; Push-pointing of hollow material, e.g. tube

Definitions

  • the invention relates to a method for drawing a seamless metal tube according to the preamble of claim 1.
  • Non-productive times mean the time that elapses in the preparation of the pipe before drawing. These include, for example, filling in a drawing oil, inserting the mandrel, molding the drawing die, inserting the drawing die into the die and grasping the drawing die with the drawing pliers. These operations must be carried out before every train.
  • DE-A-26 23 385 describes a method of the type mentioned at the outset, in which the mandrels arranged one behind the other and releasably connected to one another in accordance with their assignment to the dies are inserted into the tube length to be drawn, after which the tube length is sharpened and through the first Die is passed through. The tube is pulled until the first mandrel belonging to the first drawing die has reached its position during the drawing process. At this moment, the remaining mandrels are separated from the first mandrel and fed to the next drawing stage, the operations being repeated until the penultimate drawing stage.
  • tension members are, for example, so-called slide-drawing machines
  • DE-A-2 623 385 discloses a method of the type mentioned at the outset, in which a plurality of mandrels with stepped diameters are inserted into the tube to be drawn at the same time, which are put into operation one after the other by introducing dents into the metal tube. This makes work easier to the extent that a new mandrel no longer has to be inserted after each drawing step. If a tube length is to be pulled down to the final dimension in several drawing stages using such “multiple mandrels”, the diameter difference between the drawing stages and the number of drawing stages are very limited so that the drawing bar does not tear off. In addition, with an arrangement of several drawing nozzles directly behind one another, the start-up process is complicated and is associated with a high loss of material because of the long drawing bar that is then necessary.
  • the first cold working step on the press or rolled pipe consists of a pilger roll in which several rolled or press pipes are pilgrimed together. Maximum cross-sectional decreases are possible with this civilage process.
  • the vocational tube is then pulled down to the required final dimension in several drum trains.
  • the disadvantage of the so-called drum drawing process is that the pipe length that is drawn is stored in a basket-like container and then fed to the next drawing step. For example, if you work with a drawing drum, you need a large number of basket-like containers for economical production. The reason for this is that, in order to avoid frequent die changes, a large number of vocational tubes are first pulled down, each tube length being stored in a basket-like container.
  • pulling straight ahead has the advantage that the maximum cross-sectional reductions can be chosen higher. Cross-sectional reductions of up to 40% are possible when pulling straight, whereas maximum cross-sectional reductions of 35% occur when pulling the drum, since part of the force required for the deformation is necessary to bend the pipe. For this reason, pulling straight could save one or more trains, for example.
  • the present invention is therefore based on the object of specifying a method by means of which it is possible to produce seamless tubes in a continuous manner straightforward operation in several drawing stages.
  • each step is molded on by cold drawing or hammering.
  • the diameter of the pipe to be sharpened is essentially reduced, whereas the wall thickness decreases only slightly.
  • you want to achieve greater wall thickness reductions it is advantageous to carry out the cold drawing or hammering using a mandrel.
  • the mandrels for each drawing stage are inserted into the end of the tube before the drawing die is formed.
  • the mandrels are arranged relatively firmly on the rod so that they can be separated from the mandrel stuck in the drawing die together with the rod while maintaining their longitudinal axial distance from one another. For this reason, it makes sense to use a rod whose diameter is also slightly graduated.
  • the inner bores of the individual mandrels are adapted to these gradations. A tight rubber ring could sit on the rod behind each mandrel, preventing the mandrels from moving.
  • 1 denotes a copper pipe, for example a cold pilgered pipe with a length of approximately 90 m, an outer diameter of 55 mm and a wall thickness of 2.3 mm.
  • a portion of drawing oil is first introduced into the end of this tube 1, a dent 21 is formed, and then six mandrels 2a, 2b, 2c, 2d, 2f are pushed against the dent 21.
  • the dimensions of the mandrels 2a to 2f are matched to the individual drawing stages.
  • the mandrels 2a to 2f are threaded onto a rod 3 which is slightly graduated from left to right.
  • a drawing bar 4 is formed on the end of the copper tube 1.
  • the molding of the drawing bar 4 is expediently done by hammering or by cold drawing.
  • the drawing bar 4 is graduated.
  • the gradations 4a, 4b, 4c, 4d, 4e and 4f are molded on one after the other and are matched in terms of their diameter to the clear widths of the drawing dies 5 arranged one behind the other.
  • the length of the individual gradations 4a to 4f corresponds in each case to the length of a conventional drawing bar.
  • the wall thickness in the area of the individual gradations 4a to 4f can be the same or less than the wall thickness of the copper tube 1. It is essential, however, that the cross section in the area of the individual gradations 4a to 4f is sufficient to transmit the necessary tensile force.
  • the drawbar formed in this way is then passed through a die 5 until the step 4a partially protrudes from the die 5.
  • the diameter of the step 4a thus corresponds to the inside width of the die 5 or is slightly smaller.
  • a pair of clamping packs 6 of a slide drawing machine which engages the pipe 1 in the area of the step 4a and pulls the pipe 1 through the drawing die 5.
  • the mandrel 2a is transported in the area of the die 5 and assumes the position required for the drawing process.
  • a dent 8 is created in the copper tube 1 by means of a denting device 7 arranged behind the die 5, which dent takes the mandrels 2b to 2f and the rod 3 with it.
  • This process is repeated in the next three drawing stages, the mandrels 2b, 2c and 2d remaining in the corresponding dies, whereas the remaining mandrels are carried along with the rod 3.
  • the tension member is a so-called roller withdrawal device.
  • the rollers 10 are moved together so that they grip the tube 1.
  • the rollers 10 are driven and are able to pull the copper tube 1 through the die 9.
  • a Dell device 7 is provided, which creates a dent 8 in the copper tube 1, which takes the mandrel 2f with the rod 3.
  • step 4f After the step 4f has passed through the last die 9 and been gripped by the rollers 10 of the last drawing stage and the mandrel 2f has taken up its position, the speed of the installation is increased to the permissible level and the drawing process is carried out.
  • the drawing bar 4 When the speed is increased, the drawing bar 4 is separated by means of the flying saw 20.
  • the entire threading process runs fully automatically and takes about a minute. Only one person is required to operate one or more systems, who carries out the preparatory work such as introducing drawing oil, introducing mandrels and shaping the drawbar during the drawing process.
  • FIG. 6 shows a schematic sequence of the drawing line.
  • the copper tube 1, in the end of which the mandrels 2a to 2f and a portion of drawing oil have been introduced, is provided in a shaping device 11 with a drawing bar according to FIG.
  • the copper tube 1 prepared in this way is then introduced into the drawing line, which consists of the individual drawing stages 12 to 17.
  • Each drawing stage consists of a die and a tension member.
  • the tension members are so-called slide-pulling devices, whereas the tension members in drawing stages 16 and 17 are so-called roller pull-off devices because of the higher speed of the copper pipe 1 passing through.
  • the drawing stages 12 to 16 still have the indentation devices 7.
  • the copper tube 1 can be cut by means of a flying saw 20 or wound into coils 18.
  • Tables 1 and 2 below show the changes in cross-section and the drawing speeds.
  • the hourly output (ordinate) as a function of the drawing-in time (abscissa) for various weights of the tube (parameters) can be read for a tube with the dimensions 15 x 0.95 mm and a take-off speed behind the last drawing die.
  • An additional train can also be added without making the process more expensive. This can be advantageous for production systems in which the production of the front pipe or outlet pipe is a bottleneck for drawing. Lower cross-sectional decreases in pre-production, for example a cold pilger rolling mill, result in higher output measured at weight at the same speed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
EP84116298A 1984-02-17 1984-12-24 Verfahren zum Ziehen eines nahtlosen Metallrohres Expired EP0153495B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84116298T ATE36127T1 (de) 1984-02-17 1984-12-24 Verfahren zum ziehen eines nahtlosen metallrohres.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3405641 1984-02-17
DE19843405641 DE3405641A1 (de) 1984-02-17 1984-02-17 Verfahren zum ziehen eines nahtlosen metallrohres

Publications (3)

Publication Number Publication Date
EP0153495A2 EP0153495A2 (de) 1985-09-04
EP0153495A3 EP0153495A3 (en) 1986-02-12
EP0153495B1 true EP0153495B1 (de) 1988-08-03

Family

ID=6227955

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84116298A Expired EP0153495B1 (de) 1984-02-17 1984-12-24 Verfahren zum Ziehen eines nahtlosen Metallrohres

Country Status (3)

Country Link
EP (1) EP0153495B1 (it)
AT (1) ATE36127T1 (it)
DE (2) DE3405641A1 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4328002C1 (de) * 1993-08-20 1994-08-04 Schumag Ag Verfahren zur Vorbereitung eines dickwandigen Rohrrohlings für einen nachfolgenden Kaskadenzug

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3634229C1 (en) * 1986-10-08 1987-12-17 Rudolf Bueltmann Device for grasping a tube to be drawn
EP0353324B1 (de) * 1988-08-03 1992-06-17 Schumag Aktiengesellschaft Verfahren zum Geradeausziehen von Rohren und Einrichtung zur Durchführung des Verfahrens
CN1045910C (zh) * 1993-11-10 1999-10-27 上海异型钢管股份有限公司 整体型路灯杆用金属锥形管拔制制造方法
DE19612991A1 (de) * 1996-03-22 1997-10-02 Mannesmann Ag Ziehstopfen für Rohrziehmaschinen
IT1310796B1 (it) * 1999-12-20 2002-02-22 Danieli Ct Maskin Spa Procedimento ed impianto per la trafilatura a freddo di tubi metallici
IT201700023064A1 (it) * 2017-03-01 2018-09-01 Danieli Off Mecc Laminatoio per la laminazione di elementi astiformi cavi o comunque concavi
CN117718347B (zh) * 2023-12-20 2024-06-14 四川万圣通精密机械制造有限公司 一种冷拔机

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE2635615C2 (de) * 1976-08-07 1983-08-25 Otto 3167 Burgdorf Uhlmann Abzugsvorrichtung für aus einer Ziehmatrize austretende metallische Rohre
DE2653784A1 (de) * 1976-11-26 1978-06-01 Kabel Metallwerke Ghh Verfahren und vorrichtung zum ziehen von rohren

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4328002C1 (de) * 1993-08-20 1994-08-04 Schumag Ag Verfahren zur Vorbereitung eines dickwandigen Rohrrohlings für einen nachfolgenden Kaskadenzug

Also Published As

Publication number Publication date
DE3405641A1 (de) 1985-08-22
DE3405641C2 (it) 1991-07-25
ATE36127T1 (de) 1988-08-15
EP0153495A3 (en) 1986-02-12
DE3473123D1 (en) 1988-09-08
EP0153495A2 (de) 1985-09-04

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