US3495429A - Method of reducing tubes,especially thick-walled tubes and means for practicing the method - Google Patents

Method of reducing tubes,especially thick-walled tubes and means for practicing the method Download PDF

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Publication number
US3495429A
US3495429A US645717A US3495429DA US3495429A US 3495429 A US3495429 A US 3495429A US 645717 A US645717 A US 645717A US 3495429D A US3495429D A US 3495429DA US 3495429 A US3495429 A US 3495429A
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US
United States
Prior art keywords
tube
tubes
reducing
zone
roll
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Expired - Lifetime
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US645717A
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English (en)
Inventor
Gerhard Karl Gunther Muller
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SKF AB
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Svenska Kullagerfabriken AB
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Application filed by Svenska Kullagerfabriken AB filed Critical Svenska Kullagerfabriken AB
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Publication of US3495429A publication Critical patent/US3495429A/en
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    • 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

  • a tube reducing mill comprising a plurality of rolls wherein the tube outer diameter is reduced without appreciably changing the thickness of the wall, each roll having a central rotational axis disposed at an angle relative to the tube axis and having at least three zones, namely, a feeding zone, a reducing zone and a smoothing zone.
  • the feeding zone and smoothing zone are defined by frusto-conical circumferentially extending surfaces separated by a shoulder defining a reducing zone.
  • the surface of the reducing zone is inclined relative to the axis of the tube at a predetermined angle so that the outer diameter of the tube may be reduced between 5%-31% during passage of the tube through the mill.
  • the present invention relates to a method and means for the reduction of primarily thick-walled tubes in which the wall thickness is maintained practically constant.
  • the purpose of the invention is to eliminate certain disadvantages arising in this process in conventional rolling mills and to make it possible to manufacture tubes with comparatively greater wall thickness than has hitherto been possible.
  • Tube reducing mills of hitherto known types for reducing the outer diameter while maintaining the wall thickness comprise a plurality of rolling mill stands with two or more rolls which work on the tube in an axial direction.
  • the rolls of subsequent stands are frequently disposed at a suitable angle relative to those of the preceding stand, the grooves of following rolls being smaller than those of the preceding rolls.
  • Another way of reducing a tube is by the well-known Assel method.
  • the rolling takes place in a direction practically perpendicular to the axis of the rotating tube, which is fed forward while being rotated past three substantially conical rolls having shoulders on their rolling surfaces.
  • the work of reduction is concentrated at the shoulders thereby that the material is worked upon between a mandrel applied in the tube and the shoulders of the rolls.
  • a substantial reduction of the wall thickness can be obtained when rolling according to this principle.
  • the Assel method cannot be used when the relationship Odzw of the finished tube is less than 4.5.
  • the present invention relates to a method for reducing the inner and outer diameters of the tube without any appreciable change in the wall thickness.
  • the tube is reduced in a three roll tube reducing mill of a design known per se and without the use of a mandrel.
  • the rolls differ from those previously known whereby it is made possible to accomplish a considerable reduction of comparatively thick-walled tubes which has hitherto not been possible in rolling mills of known type.
  • the numeral 1 indicates the tube being rolled and 2 is the roll.
  • the roll profile is divided into four zones, of which the first, at the side at which the the tube enters, is a feeding zone 3 which is comparatively wide.
  • This zone has the form of a truncated cone having a top angle of 6-10.
  • the function of this zone is to grip the tube and through friction rotate it about its axis and feed it into the rolling mill.
  • the angle of inclination at indicated between the lines C and D is preferably about 3-5".
  • the next portion of the profile of the roll is the reducing zone 4 formed by a shoulder on the roll.
  • a smoothing zone 5 which is nearly parallel with, or inclined not more than 2 relative to, the axis of the tube when the roll engages the tube and converges towards the entrance in-feed end of the mill.
  • the function of this zone is to smooth out irregularities in the surface of the tube.
  • the last zone 6 of the roll is for eliminating out of roundness.
  • the surface of this zone can be either cylindrical or conical with a top angle of 0 to 2".
  • the edges of the outer zones of the rolls may suitably be made convex or have a suitable radius as shown at 7' and 8. In some cases it may be found preferable to combine the smoothing zone and the zone for eliminating out of roundness to form a single zone.
  • a tube is produced having narrow tolerances and uniform wall thickness along its whole length.
  • the mill can be much more easily adjusted to size than conventional mills which means a saving in time when changing over from one dimension to another.
  • the invention is in no way limited to the forms described above, but may be varied in different ways within the scope of the following claims.
  • the method may be used for making tubes of metal or other material either in cold or hot state. In the latter case, the reducing operation should suitably take place at a temperature over 700 C.
  • a reducing mill for reducing the outer diameter of a tube without appreciably reducing the thickness of the wall thereof consisting of a plurality of rotatable working rolls arranged to engage and support the workpiece without the need of a mandrel, means for rotating the working rolls to rotate the tube about its axis and feed the same in longitudinal feed direction relative to the rolls, each roll comprising at least three zones, 2.
  • feeding zone in the form of a truncated cone having a top angle of between 6 and 10, the smaller diameter end of said truncated cone facing in a direction opposite the feed direction of said tube, a reducing zone defined by a conical shoulder and being at an inclination relative to the axis of the tube to form an angle of more than and a smoothing zone defined by a frusto-conical surface inclined not more than 2 relative to the axis of the tube, the relationship between the maximum diameter of the shoulder andthe outer diameter of the tube being less than 3.5, the central axis of said roll being disposed at an angle in the range of 3-5 relative to the axis of the tube,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Metal Extraction Processes (AREA)
US645717A 1966-06-16 1967-06-13 Method of reducing tubes,especially thick-walled tubes and means for practicing the method Expired - Lifetime US3495429A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE08260/66A SE329584B (it) 1966-06-16 1966-06-16

Publications (1)

Publication Number Publication Date
US3495429A true US3495429A (en) 1970-02-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
US645717A Expired - Lifetime US3495429A (en) 1966-06-16 1967-06-13 Method of reducing tubes,especially thick-walled tubes and means for practicing the method

Country Status (4)

Country Link
US (1) US3495429A (it)
DE (1) DE1602017A1 (it)
GB (1) GB1185487A (it)
SE (1) SE329584B (it)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3693390A (en) * 1967-11-04 1972-09-26 Brueninghaus Gmbh Stahlwerke Method and apparatus for the production of elongated conical metallic articles
US4409810A (en) * 1980-07-18 1983-10-18 Sumitomo Kinzoku Kogyo Kabushiki Kaisha Process for manufacturing seamless metal tubes
US4416134A (en) * 1981-02-17 1983-11-22 Sumitomo Kinzoku Kogyo Kabushiki Kaisha Process for manufacturing seamless metal tubes
DE3323221A1 (de) * 1982-06-30 1984-01-05 Sumitomo Metal Industries, Ltd., Osaka Verfahren zur herstellung von gestaengerohr
FR2529481A1 (fr) * 1982-06-30 1984-01-06 Sumitomo Metal Ind Procede de fabrication de produits metalliques a section transversale circulaire
US20060016234A1 (en) * 2004-07-12 2006-01-26 Yasuyuki Kuroda Apparatus and method for production of tapered steel pipe
US11420241B2 (en) * 2019-02-28 2022-08-23 Northwestern Polytechnical University Method for preparing ultrafine-grained superalloy bar

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2486831A1 (fr) * 1980-07-18 1982-01-22 Sumitomo Metal Ind Procede de fabrication de tubes metalliques sans soudures
AT393966B (de) * 1988-03-25 1992-01-10 Blaschke Pumpen Filteranlagen Schutzanzug zur verwendung in einem durch giftstoffe verseuchten gebiet
DE19536637C1 (de) * 1995-09-22 1997-01-16 Mannesmann Ag Kalibrierung für Schulterwalzen in Schrägwalzwerken
DE19613715C1 (de) * 1996-03-27 1997-07-24 Mannesmann Ag Kalibrierung der Schulterwalze eines Asselwalzwerkes
DE102012007379B4 (de) * 2012-04-12 2016-12-29 Zhozef Rotenberg Verfahren zum Schrägwalzen von zylindrischen Erzeugnissen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2060767A (en) * 1933-02-15 1936-11-10 Timken Roller Bearing Co Process of rolling tubes and rods
US2101357A (en) * 1934-05-28 1937-12-07 Timken Roller Bearing Co Cross-roll mill
US2176412A (en) * 1936-08-19 1939-10-17 Timken Roller Bearing Co Method and apparatus for sizing tubes
US2358307A (en) * 1942-08-29 1944-09-19 Clarence L Dewey Tube reducing machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2060767A (en) * 1933-02-15 1936-11-10 Timken Roller Bearing Co Process of rolling tubes and rods
US2101357A (en) * 1934-05-28 1937-12-07 Timken Roller Bearing Co Cross-roll mill
US2176412A (en) * 1936-08-19 1939-10-17 Timken Roller Bearing Co Method and apparatus for sizing tubes
US2358307A (en) * 1942-08-29 1944-09-19 Clarence L Dewey Tube reducing machine

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3693390A (en) * 1967-11-04 1972-09-26 Brueninghaus Gmbh Stahlwerke Method and apparatus for the production of elongated conical metallic articles
US4409810A (en) * 1980-07-18 1983-10-18 Sumitomo Kinzoku Kogyo Kabushiki Kaisha Process for manufacturing seamless metal tubes
US4416134A (en) * 1981-02-17 1983-11-22 Sumitomo Kinzoku Kogyo Kabushiki Kaisha Process for manufacturing seamless metal tubes
DE3323221A1 (de) * 1982-06-30 1984-01-05 Sumitomo Metal Industries, Ltd., Osaka Verfahren zur herstellung von gestaengerohr
FR2529481A1 (fr) * 1982-06-30 1984-01-06 Sumitomo Metal Ind Procede de fabrication de produits metalliques a section transversale circulaire
FR2529482A1 (fr) * 1982-06-30 1984-01-06 Sumitomo Metal Ind Procede de fabrication de tiges creuses
US4510787A (en) * 1982-06-30 1985-04-16 Sumitomo Metal Industries, Ltd. Method of manufacturing hollow rods
US20060016234A1 (en) * 2004-07-12 2006-01-26 Yasuyuki Kuroda Apparatus and method for production of tapered steel pipe
US7296450B2 (en) * 2004-07-12 2007-11-20 Nippon Steel Corporation Apparatus and method for production of tapered steel pipe
US11420241B2 (en) * 2019-02-28 2022-08-23 Northwestern Polytechnical University Method for preparing ultrafine-grained superalloy bar

Also Published As

Publication number Publication date
SE329584B (it) 1970-10-19
GB1185487A (en) 1970-03-25
DE1602017A1 (de) 1970-04-09

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