EP0798057A1 - Calibrage d'un cylindre à épaulement pour laminoir de type Assel - Google Patents

Calibrage d'un cylindre à épaulement pour laminoir de type Assel Download PDF

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Publication number
EP0798057A1
EP0798057A1 EP97250099A EP97250099A EP0798057A1 EP 0798057 A1 EP0798057 A1 EP 0798057A1 EP 97250099 A EP97250099 A EP 97250099A EP 97250099 A EP97250099 A EP 97250099A EP 0798057 A1 EP0798057 A1 EP 0798057A1
Authority
EP
European Patent Office
Prior art keywords
shoulder
radius
roller
radii
calibration
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
EP97250099A
Other languages
German (de)
English (en)
Other versions
EP0798057B1 (fr
Inventor
Gheorghe Dipl.-Ing. Arnautu
Frank Dipl.-Ing. Salomon
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
Publication of EP0798057A1 publication Critical patent/EP0798057A1/fr
Application granted granted Critical
Publication of EP0798057B1 publication Critical patent/EP0798057B1/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
    • B21B—ROLLING OF METAL
    • B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
    • B21B19/06—Rolling hollow basic material, e.g. Assel mills

Definitions

  • the invention relates to a calibration of the shoulder rolls of an Assel cross-rolling mill for the hot rolling of tube blanks from pre-punched hollow bodies over a mandrel, with three rolls offset by 120 ° relative to one another and inclined with respect to the rolling axis and pivoted to the rolling axis, each with an inlet part arranged upstream of the shoulder, one of the Shoulder downstream discharge part, as well as continuous transitions between the parts of each shoulder roller.
  • Assel rolls serve to stretch a relatively thick-walled hollow body in a relatively short forming zone, in which a reduction in wall thickness is carried out.
  • the shoulder rollers of the Assel mill consist essentially of an inlet part, which is usually formed from an inlet cone with a slight inclination, the work part with the work shoulder and the smoothing part or the outlet part.
  • the inlet cone or the inlet part has the task of grasping the billet, rotating it and pulling it onto the mandrel rod with a constant feed.
  • the work part also called the work shoulder or shoulder part, adjoins the inlet part, a step-like change in the roller diameter, the step height of which depends on the material to be processed.
  • the purpose of the shoulder is to carry out a large reduction in wall thickness within a relatively narrow range in order to have a favorable influence on the dimensional stability of the thick-walled one Use the front tube to distribute tangential and axially directed changes in shape.
  • the subsequent outlet part has the purpose of partially detaching the tube from the mandrel bar and smoothing the surface of the tube.
  • the caliber contour of the inlet part, working part and smoothing part is composed of straight line elements which are connected to one another with continuous transitions in the form of an arc.
  • a roll calibration is known in which two small radii merge tangentially into one another and into the inlet and outlet parts.
  • the proposed geometry of the forming zone changes the characteristic of the curve for the degree of stretch distribution significantly.
  • the feed efficiency increases. This is equivalent to an increase in the performance of an Assel mill that is equipped with the calibration of the rolls according to the invention.
  • Tests have shown that the feed efficiency has risen from 0.7 to 0.9 today to 1.48 to 1.68. Due to the optimized forming conditions, taking into account today's theoretical calculation of the run-out speed of the billet from the Assel roller, the feed efficiency can be greater than 1.
  • the tolerances both in the thick-walled and in the thin-walled dimensional range can be improved by the proposal of the invention; the risk of triangulation is reduced by reducing the axial resistance, so that an improved product is to be expected overall.
  • the deformation part of a woodleaf is shown in the shoulder area.
  • the run-in area is designated E
  • the run-out area is A.
  • the roller with the entry radius R 1 of 6 mm is curved and merges tangentially into the transition radius R 2 of 15 mm, the center of the radius of which corresponds to the center of the radius of the entry radius R 1 opposite side.
  • the center point of the exit radius R 3 of 100 mm merges tangentially into the transition radius R 2 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
EP97250099A 1996-03-27 1997-03-25 Calibrage d'un cylindre à épaulement pour laminoir de type Assel Expired - Lifetime EP0798057B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19613715 1996-03-27
DE19613715A DE19613715C1 (de) 1996-03-27 1996-03-27 Kalibrierung der Schulterwalze eines Asselwalzwerkes

Publications (2)

Publication Number Publication Date
EP0798057A1 true EP0798057A1 (fr) 1997-10-01
EP0798057B1 EP0798057B1 (fr) 2000-05-10

Family

ID=7790597

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97250099A Expired - Lifetime EP0798057B1 (fr) 1996-03-27 1997-03-25 Calibrage d'un cylindre à épaulement pour laminoir de type Assel

Country Status (2)

Country Link
EP (1) EP0798057B1 (fr)
DE (2) DE19613715C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0885667A2 (fr) * 1997-06-09 1998-12-23 MANNESMANN Aktiengesellschaft Laminoir oblique pour étirer un corps creux sans soudure, chauffé à la température de formage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE926541C (de) * 1952-08-12 1955-04-21 Rheinische Roehrenwerke Ag Schulterschraegwalzwerk zum Streckreduzieren vorzugsweise starkwandiger Rohre
DE1602017A1 (de) * 1966-06-16 1970-04-09 Skf Svenska Kullagerfab Ab Verfahren zur Reduzierung von Rohren,insbesondere starkwandigen Rohren und Vorrichtung zur Durchfuehrung des Verfahrens
DE3406841A1 (de) * 1984-02-23 1985-09-12 Mannesmann AG, 4000 Düsseldorf Walzenanstellung fuer ein dreiwalzen-kegelschraegwalzwerk
DE19536637C1 (de) * 1995-09-22 1997-01-16 Mannesmann Ag Kalibrierung für Schulterwalzen in Schrägwalzwerken

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2176412A (en) * 1936-08-19 1939-10-17 Timken Roller Bearing Co Method and apparatus for sizing tubes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE926541C (de) * 1952-08-12 1955-04-21 Rheinische Roehrenwerke Ag Schulterschraegwalzwerk zum Streckreduzieren vorzugsweise starkwandiger Rohre
DE1602017A1 (de) * 1966-06-16 1970-04-09 Skf Svenska Kullagerfab Ab Verfahren zur Reduzierung von Rohren,insbesondere starkwandigen Rohren und Vorrichtung zur Durchfuehrung des Verfahrens
DE3406841A1 (de) * 1984-02-23 1985-09-12 Mannesmann AG, 4000 Düsseldorf Walzenanstellung fuer ein dreiwalzen-kegelschraegwalzwerk
DE19536637C1 (de) * 1995-09-22 1997-01-16 Mannesmann Ag Kalibrierung für Schulterwalzen in Schrägwalzwerken

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0885667A2 (fr) * 1997-06-09 1998-12-23 MANNESMANN Aktiengesellschaft Laminoir oblique pour étirer un corps creux sans soudure, chauffé à la température de formage
EP0885667A3 (fr) * 1997-06-09 2001-08-01 MANNESMANN Aktiengesellschaft Laminoir oblique pour étirer un corps creux sans soudure, chauffé à la température de formage

Also Published As

Publication number Publication date
EP0798057B1 (fr) 2000-05-10
DE19613715C1 (de) 1997-07-24
DE59701618D1 (de) 2000-06-15

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