EP0392644B1 - Verfahren zur Beseitigung von Längsstauchnähten - Google Patents

Verfahren zur Beseitigung von Längsstauchnähten Download PDF

Info

Publication number
EP0392644B1
EP0392644B1 EP90250089A EP90250089A EP0392644B1 EP 0392644 B1 EP0392644 B1 EP 0392644B1 EP 90250089 A EP90250089 A EP 90250089A EP 90250089 A EP90250089 A EP 90250089A EP 0392644 B1 EP0392644 B1 EP 0392644B1
Authority
EP
European Patent Office
Prior art keywords
upsetting
pressed
pressing
mandrel
shells
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 - Lifetime
Application number
EP90250089A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0392644A3 (de
EP0392644A2 (de
Inventor
Michael Johann Schindler
Wulff-Eckhard Von Borcke
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.)
Vodafone GmbH
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
Priority to AT90250089T priority Critical patent/ATE99578T1/de
Publication of EP0392644A2 publication Critical patent/EP0392644A2/de
Publication of EP0392644A3 publication Critical patent/EP0392644A3/de
Application granted granted Critical
Publication of EP0392644B1 publication Critical patent/EP0392644B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting

Definitions

  • the invention relates to a method for eliminating longitudinal compression seams according to the preamble of the main claim.
  • the wall thickness in the end area must be increased depending on the load in the area of application and the type of thread cut. This is done in a known manner in that a certain length at the end of the pipe is hot-swaged in an upsetting machine, thereby increasing the wall thickness.
  • longitudinal compression seams are formed in the compression area on the outside of the pipe end, since the tie rods that compress the two compression half-shells are stretched elastically during the compression and material flows into the gap between the two compression half-shells.
  • the edges of the compression half-shells in a certain area are also gradually worn out with increasing number of upsets, so that the gap becomes ever larger.
  • EP-A-0 299 948 shows a process for producing a two-layer or multi-layer composite rod, in which the cylindrical starting body is forged with a simultaneous turning to a smaller diameter by means of a continuously working forging machine preferably having 4 hammers. It is essential to the invention that the individual hammer has a certain cross-sectional contour in the longitudinal direction. The continuous rotation of the workpiece during the longitudinal feed is intended to prevent burrs from occurring. This document does not indicate the conditions under which a burr may arise, what its cross-sectional contour looks like and how it should be removed in a targeted manner.
  • the object of the invention is to provide a generic method that can be integrated into an existing manufacturing process without effort and with the the longitudinal compression seams formed in the discontinuous hot upsetting of pipe ends can be eliminated in a simple and cost-effective manner, so that the subsequent dimensional processing can be increased in terms of quality and performance and the fatigue strength of highly stressed pipe connections is not reduced with the better surface.
  • the longitudinal upset seams formed are removed immediately after the end of the upset process in the form of an attached further production step with the same heat.
  • the tube is rotated by a predetermined angle and then lowered again into the working area.
  • the upsetting seams are then no longer in the original parting plane of the Compression half-shells, but offset by the specified angular amount in the respective compression half-shell.
  • the tool set can also be rotated. However, this means a not inconsiderable effort in the construction of the upsetting machines and the existing machines would have to be converted to do so.
  • the protruding compression seam material is pushed radially away, the retracted support mandrel preventing ovalization of the inside diameter.
  • the cross-sectional geometry of the seams formed during the upsetting process is such that the pushing away is promoted and no wrinkles can occur. This is most likely to be achieved if the compression seam formed is lenticular with only a small radial extension and with rounded transitions into the surrounding area.
  • crumpling can also be avoided if the tubes are rotated in an area of 90 degrees, so that the apex area of the compression half-shell presses the compression seam as symmetrically as possible and ideally the material flows away evenly to both sides. In order to save costs, reheating of the upset tube end area is not provided, but the sufficient residual heat still remaining from the upset process is to be used to remove the upset seams.
  • the repressing is carried out in the second tool set lying parallel thereto, it then being possible to modify the inner contour of the compression half-shells with a view to making the seams easier to push away.
  • a support mandrel without a compression collar can be used in such a combination, so that the entry limit for the support mandrel is of no importance.
  • the proposed method can be carried out with a view to the smoothest possible surface in the tube end area in the event of multiple upsets after each upsetting process, but in any case after the last upsetting process.
  • the advantage of the proposed method is that manual plastering can be dispensed with.
  • Another advantage of the method can be seen in the fact that the existing upsetting machines can be used without any change and the required conversion in the feed area is structurally simple and inexpensive.
  • re-pressing means no loss of cycle time, since there is sufficient time for radial re-pressing for cooling, cleaning and lubricating the tool set. It should be noted that the effective cycle time for hot upsetting of pipe ends is not determined by the upsetting and post-treatment of the tool set, but by the heating of the pipe ends in the upstream induction coils.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Press Drives And Press Lines (AREA)
  • Processing Of Solid Wastes (AREA)
  • Sewing Machines And Sewing (AREA)
EP90250089A 1989-04-12 1990-04-03 Verfahren zur Beseitigung von Längsstauchnähten Expired - Lifetime EP0392644B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90250089T ATE99578T1 (de) 1989-04-12 1990-04-03 Verfahren zur beseitigung von laengsstauchnaehten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3912423 1989-04-12
DE3912423A DE3912423C1 (enExample) 1989-04-12 1989-04-12

Publications (3)

Publication Number Publication Date
EP0392644A2 EP0392644A2 (de) 1990-10-17
EP0392644A3 EP0392644A3 (de) 1991-07-03
EP0392644B1 true EP0392644B1 (de) 1994-01-05

Family

ID=6378756

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90250089A Expired - Lifetime EP0392644B1 (de) 1989-04-12 1990-04-03 Verfahren zur Beseitigung von Längsstauchnähten

Country Status (6)

Country Link
US (1) US5050419A (enExample)
EP (1) EP0392644B1 (enExample)
JP (1) JPH02295630A (enExample)
AT (1) ATE99578T1 (enExample)
DE (2) DE3912423C1 (enExample)
ES (1) ES2047835T3 (enExample)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003013959A (ja) * 2001-06-28 2003-01-15 Koyo Seiko Co Ltd 転がり軸受用鋼球とその製造方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2027406A (en) * 1930-02-21 1936-01-14 Clark Equipment Co Forging means
US2074104A (en) * 1933-09-13 1937-03-16 William W Criley Blank turning and transfer mechanism
US2212903A (en) * 1937-09-20 1940-08-27 Albert B Steigerwalt Method of manufacturing axles and the like
GB722765A (en) * 1953-09-11 1955-01-26 Samuel Smith Improvements connected with swaging machines
US3570298A (en) * 1968-09-24 1971-03-16 Hermann Detzel Forging
AT366938B (de) * 1980-12-22 1982-05-25 Gfm Fertigungstechnik Verfahren zum herstellen oertlicher mantelverst[rkungen an hohlkoerpern
AT388318B (de) * 1987-06-12 1989-06-12 Gfm Fertigungstechnik Verfahren und schmiedemaschine zur herstellung von verbundkoerpern

Also Published As

Publication number Publication date
ATE99578T1 (de) 1994-01-15
EP0392644A3 (de) 1991-07-03
ES2047835T3 (es) 1994-03-01
DE59004081D1 (de) 1994-02-17
DE3912423C1 (enExample) 1990-05-10
EP0392644A2 (de) 1990-10-17
US5050419A (en) 1991-09-24
JPH02295630A (ja) 1990-12-06

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