EP0796676A2 - Mandrins pour machines d'étirage de tubes - Google Patents

Mandrins pour machines d'étirage de tubes Download PDF

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Publication number
EP0796676A2
EP0796676A2 EP97250083A EP97250083A EP0796676A2 EP 0796676 A2 EP0796676 A2 EP 0796676A2 EP 97250083 A EP97250083 A EP 97250083A EP 97250083 A EP97250083 A EP 97250083A EP 0796676 A2 EP0796676 A2 EP 0796676A2
Authority
EP
European Patent Office
Prior art keywords
pulling
plug
rod
plugs
guide part
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Withdrawn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
EP97250083A
Other languages
German (de)
English (en)
Other versions
EP0796676A3 (fr
Inventor
Karl-Heinz Ing. Häusler
Peter Dipl.-Ing. Kalkenings
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.)
SMS Siemag AG
Original Assignee
Mannesmann 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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0796676A2 publication Critical patent/EP0796676A2/fr
Publication of EP0796676A3 publication Critical patent/EP0796676A3/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Withdrawn legal-status Critical Current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
    • 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
    • B21C1/00—Manufacture of metal sheets, wire, rods, tubes or like semi-manufactured products by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes
    • B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes specially adapted for making tubular articles
    • B21C1/24—Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods 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, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels for metal drawing
    • B21C3/16—Mandrels; Mounting or adjusting same

Definitions

  • the invention relates to pulling plugs in a device for pulling seamless metal pipes through one or more drawing dies, the single-pull pulling plug made of a hard metal being arranged overhung within the pipe and guided almost centrally in the pipe with the aid of an essentially cylindrical guide part in a stable position and in the case of multiple pulling, several graded pulling plugs made of hard metal are arranged one behind the other on a concentrically penetrating rod, guided in a stable position almost centrally within the pipe, and the pulling plugs are transported into the position required for the pulling process by the movement of the pipe length.
  • pull plugs When pulling pipes, pull plugs are used as internal tools, which are arranged on the fly when continuously pulling long pipe lengths. Since they have to endure high loads, they are made from particularly strong and low-wear materials, usually from hard metal. In order to keep the tool costs low, it makes sense to manufacture the plugs with the least possible use of materials.
  • both single and multi-unit drawing machines are known.
  • single drawing machines the same pipe runs through the same drawing machine several times in succession, with an increasingly smaller pipe size being produced by changing the drawing tools (drawing die and drawing plug).
  • the drawing machine can be both a single continuous straight-line drawing machine and a drum drawing machine.
  • the plugs are either loosely inserted into the pipe to be drawn in the order of the drawing dies to be passed and are carried along by indentations behind the last plug (EP 0 353 324 B1, Figures 1-3). Another possibility is described in DE 26 23 385 C2, where two pull plugs are connected to one another in the manner of a push button and released after an indentation has also been introduced into the tube behind the pull plug to be carried.
  • each pull plug consists of three basic elements, namely a cylindrical caliber part, an adjoining cone enlarging the caliber part and a cylindrical guide part adjoining the cone.
  • the last-mentioned cylindrical guide part is of no importance for the reshaping of the pipe, it mainly serves only to stabilize the position of the plug in the pipe by its weight and its outer surface lying against the inner wall of the pipe, i.e. to keep its longitudinal axis coaxial with the pipe axis. If the guide part were left out, the plug would lie obliquely in the tube and hinder the drawing process.
  • the plugs are usually made of high-strength materials, which are very expensive. If one considers that the cylindrical guide part with the largest drawing plug diameter and correspondingly large material volume is of no importance for the forming of the tube, then to see that a clear material and thus cost savings would be achievable if one could do without this guide part.
  • a pull plug which can be used both for single pull and continuous multiple pulls.
  • the pull plug for a single pull is characterized in that the guide part of the pull plug is formed separately and from a simpler material and is detachably connected to the short pull plug.
  • the invention thus consists in replacing the cylindrical guide part, which is of no importance for the shaping of the tube during the drawing process, by a cheaper material which takes over the guiding function of the drawing plug.
  • This separate guide part is detachably connected to the then very short pulling plug, which is still made of high-strength material, but is now cheaper to produce with a much smaller volume of material.
  • the guide part is formed from an elastic material, the outer surface of which corresponds approximately to the inner diameter of the pipe to be drawn.
  • an elastic material for example plastic
  • the guide part can be provided as a wear part that can be replaced very quickly for the next drawing process.
  • the outer circumferential surface of the guide part is slightly tapered counter to the direction of drawing. According to a further feature of the invention, it is also advantageous to introduce lubricant into the drawing zone in a metered manner via the annular gap formed by the conical tapering of the outer circumferential surface relative to the inner tube wall.
  • the guide part would consist of an elastic, interchangeable material.
  • the rod between the pulling plugs is provided with thickened diameters which, in an elastically retreating manner, allow the pulling plugs to be stripped off the rod against resistance.
  • the rod has a thickening preventing the pulling of the pulling plug from the rod before the first pulling plug in the pulling direction. This thickening at the same time ensures that the rod and the other pulling plugs are taken along until they come to rest in front of the drawing die to be assigned to them.
  • the rod can consist of a plastic material;
  • a metal spring element is also conceivable, which is used when the plug heating requires heat-insensitive materials.
  • a conventional pull plug is shown and designated 1. It consists of three basic elements, namely the cylindrical caliber part 2, the cone 3 and the cylindrical guide part 4. As already explained at the beginning, the cylindrical guide part 4 is of no importance for the shaping of the tube, but only serves to stabilize and guide the drawing plug 1 in Pipe. The actual deformation during the drawing process takes place between the caliber part 2 and the cone 3 within the drawing die, not shown.
  • the pulling plug 1 or, in the case of continuous multiple pulls, the pulling plugs 5, 6, 7 can be held and guided in a stable position in the tube, then the material-consuming guide part 4 of the pulling plug 1 can be dispensed with.
  • FIG 3 three differently graduated drawing plugs 5, 6, 7 are shown, which essentially consist only of the cylindrical caliber part 2 and the cone 3, that is to say they no longer have a pronounced guide part 4.
  • these are threaded onto a rod 8 and held there at a distance by a thickened diameter 9 of the rod 8 between the pull plugs 5, 6 and 7 and behind the pull plug 5 is, however, the pulling plugs 5, 6 and 7 can be removed with little effort.
  • the rod carries a larger thickening 1 0, which does not fit through the plug 7.
  • the drawing process begins in the first of the three drawing dies arranged one behind the other, the largest drawing plug 5 is used first. Due to the usual indentation of the tube behind the first drawing die, as described in DE 26 23 385 C2, the remaining plugs are taken along with the beginning of the pipe, the rod 8 being pulled out of the drawing plug 5. This process is repeated after the second drawing die. For the last train then only the plug 7 remains on the rod 8 and is stabilized by it in its position. In this way, all of the plugs 5, 6, 7 come from the wear-resistant plug material without the guide part being worked on; the component which replaces the guide parts is the rod 8 itself which connects the pulling plugs 5, 6, 7, but which is made of an inexpensive material, for example plastic.
  • the guide part 12 of the drawing plug also consists of an elastic material, the outer lateral surface 13 of which serves as a guide for the actual drawing plug 11.
  • the guide part 12 is anchored in a bore of the drawing plug 11 and can be detached from the drawing plug 11 with little effort.
  • the outer circumferential surface 13 of the guide part is slightly tapered counter to the direction of drawing, so that there is an annular gap between the tube wall 14 and the outer circumferential surface 13 of the guide part which can meter the lubricant located in the pipe to the drawing process.
  • the guide part 12 is easily replaceable as a wear part with the pull plug 1 1 and can also consist of plastic.
  • the rod can alternatively be made of a metal for several drawing plugs 5, 6, 7 Spring element 16 may be formed, which can perform the same functions as the described rod 8 made of elastic plastic.
  • the elastic guide element 18 can also be arranged here on a heat-insensitive carrier body 17 which is detachably inserted into the bore of the pull plug 11 and from which the guide element 18 is also easily detachable, as shown in FIG. 5.
  • the advantage of the proposed pulling plugs lies primarily in the significant material savings.
  • a significantly shorter overall length of the plug combination should also be mentioned as an advantage, as well as the possibility of inserting all plugs into the pipe easily and simultaneously - if necessary automatically - before fishing the pipe

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
EP97250083A 1996-03-22 1997-03-19 Mandrins pour machines d'étirage de tubes Withdrawn EP0796676A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996112991 DE19612991A1 (de) 1996-03-22 1996-03-22 Ziehstopfen für Rohrziehmaschinen
DE19612991 1996-03-22

Publications (2)

Publication Number Publication Date
EP0796676A2 true EP0796676A2 (fr) 1997-09-24
EP0796676A3 EP0796676A3 (fr) 2000-03-29

Family

ID=7790141

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97250083A Withdrawn EP0796676A3 (fr) 1996-03-22 1997-03-19 Mandrins pour machines d'étirage de tubes

Country Status (2)

Country Link
EP (1) EP0796676A3 (fr)
DE (1) DE19612991A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001045874A1 (fr) * 1999-12-20 2001-06-28 Danieli & C. Officine Meccaniche Spa Procede et installation d'etirage a froid de tubes metalliques
CN101244434B (zh) * 2008-03-13 2010-06-16 朱国良 冷拔钢管的工艺头

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1432375A (en) * 1972-09-19 1976-04-14 Std Services Ltd Plugs for use in tube-drawing
DE2615575C3 (de) * 1976-04-09 1979-11-22 Graenges Nyby Ab, Nybybruk (Schweden) Ziehdorn
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
DE3405641A1 (de) * 1984-02-17 1985-08-22 Schumag Gmbh, 5100 Aachen Verfahren zum ziehen eines nahtlosen metallrohres
GB8411289D0 (en) * 1984-05-02 1984-06-06 Sansome D H Plug drawing
JPS63309322A (ja) * 1987-06-11 1988-12-16 Sumitomo Light Metal Ind Ltd 内面溝付管の製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001045874A1 (fr) * 1999-12-20 2001-06-28 Danieli & C. Officine Meccaniche Spa Procede et installation d'etirage a froid de tubes metalliques
CN101244434B (zh) * 2008-03-13 2010-06-16 朱国良 冷拔钢管的工艺头

Also Published As

Publication number Publication date
EP0796676A3 (fr) 2000-03-29
DE19612991A1 (de) 1997-10-02

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