EP1731234B1 - Rohrherstellungsverfahren zum festdurchmesserwalzen - Google Patents

Rohrherstellungsverfahren zum festdurchmesserwalzen Download PDF

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Publication number
EP1731234B1
EP1731234B1 EP05721298A EP05721298A EP1731234B1 EP 1731234 B1 EP1731234 B1 EP 1731234B1 EP 05721298 A EP05721298 A EP 05721298A EP 05721298 A EP05721298 A EP 05721298A EP 1731234 B1 EP1731234 B1 EP 1731234B1
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EP
European Patent Office
Prior art keywords
tube
pipe
rolling
stands
outer diameter
Prior art date
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Expired - Fee Related
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EP05721298A
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English (en)
French (fr)
Japanese (ja)
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EP1731234A1 (de
EP1731234A4 (de
Inventor
Takateru Inage
Tatsuya Okui
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.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
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Publication date
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Publication of EP1731234A1 publication Critical patent/EP1731234A1/de
Publication of EP1731234A4 publication Critical patent/EP1731234A4/de
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Publication of EP1731234B1 publication Critical patent/EP1731234B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/14—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel, e.g. stretch-reducing mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/024—Rolls for bars, rods, rounds, tubes, wire or the like

Definitions

  • the present invention relates to a pipe or tube manufacturing method capable of effectively suppressing generation and progression of wrinkles which may be caused on the inner surface of a pipe or tube, when the pipe or tube is rolled by a sizing mill having at least two grooved rolls in each stand.
  • a sizing mill such as a sizer or a stretch reducer is generally used.
  • a sizing mill there is known one of three-roll type in which each stand has three grooved rolls (hereinafter, referred to as "rolling rolls" as appropriate) with an angle of 120° in a rolling direction.
  • rolling rolls there is also known a sizing mill of four-roll type in which each stand has four grooved rolls with an angle of 90° in a rolling direction.
  • a sizing mille of two-roll type in which each stand has two grooved rolls facing each other.
  • a drive shaft for a vehicle is an important part to transmit torque of the rotational axis of an engine to a wheel, so sufficient fatigue resisting strength must be secured. Therefore, if a pipe or tube is used as a drive shaft for an automobile, it is required to suppress wrinkle-like irregularities (hereinafter, referred to as “wrinkles”) as much as possible, which significantly reduce the fatigue resisting strength of the pipe or tube, generated in the inner face of the pipe or tube.
  • the wrinkles are generated frequently in a step of finishing the outer diameter of a pipe or tube so as to have a predetermined value, in the manufacturing process of the pipe or tube. This may be due to the fact that a sizing mill performs rolling of the pipe or tube without using a tool for holding the inner face of the pipe or tube, whereby wrinkles are easily caused in the inner face of the pipe or tube.
  • JP 10-156412 discloses a method in accordance with the pre-characterizing section of claim 1.
  • the present invention has been developed to solve such a problem in the conventional art, based on the knowledge newly found by the present inventors. That is, the present inventors have found that generation and progression of wrinkles in a rolling process were influenced significantly by the draft (reduction ratio of the outer diameter) with respect to the whole pipe or tube from the input side to the output side of the sizing mill having a plurality of stands.
  • the reason why wrinkles are generated and progressed intensively at positions corresponding to the edges of the pipe or tube may be the groove profile of the rolling rolls being ellipse, so that the compression force applied from the edge parts of the rolling rolls to the pipe or tube are significantly large comparing with other parts.
  • the inventors of the present invention have intensively studied and found that there was a certain relationship between the curvature radius of the inner face of a position corresponding to the edge part of a pipe or tube, the average inner radius of the pipe or tube (average value of short radius and long radius), and the depth of wrinkles.
  • the present inventors have found the following effect: if the pipe or tube was rolled under such conditions that the average value, in all stands, of the ratios between the curvature radii of the inner faces of positions corresponding to the edge parts of the pipe or tube and the average inner radii is 0.55 or more, it was possible to effectively suppress generation and progression of wrinkles which might be caused on the inner face of the pipe or tube even when the reduction ratio of the outer diameter was 50% or more.
  • the average value, in all stands, of the ratios between the curvature radii of the inner faces of positions corresponding to the edge parts of the pipe or tube and the average inner radii means a value obtained by averaging the ratios between the curvature radii of the inner faces of positions corresponding to the edge parts of the pipe or tube at the output sides of respective stands and the average inner radii, throughout all stands.
  • the inventors of the present invention have found that it is only necessary to draw tangents at edge parts facing each other of adjacent grooved rolls in each stand, and to define the minimum value of the angles formed by the tangents in all stands according to the ratio between the thickness and the outer diameter of the pipe or tube at the output side of the sizing mill, so that the present inventors have completed the present invention.
  • the present invention provides a method of manufacturing a pipe or tube, comprising the step of rolling the pipe or tube by using a sizing mill comprising a plurality of stands each of which has a plurality of grooved rolls, wherein the grooved rolls are so configured that when tangents are drawn at edge parts facing to each other of adjacent grooved rolls at each stand, assuming that a minimum value of angles defined by the tangents in all stands is ⁇ (deg), an outer diameter of the pipe or tube at an output side of the sizing mill is D (mm), and a thickness of the pipe or tube at the output side of the sizing mill is t (mm), where the angle ⁇ satisfies a following formula (1): ⁇ ⁇ 1.13 ⁇ 10 ⁇ Ln t / D ⁇ 100 + 1.37 ⁇ 10 2
  • the compression force applied to positions corresponding to the edge parts of the pipe or tube is reduced (distributed) even though the reduction ratio of the outer diameter of the pipe or tube is 50% or more, by using grooved rolls in which the angle ⁇ satisfies the above formula (1).
  • the average value, in all stands, of the ratios between the curvature radii of the inner faces of positions corresponding to the edge parts of the pipe or tube and the average inner radii can be 0.55 or more, whereby it is possible to effectively suppress generation and progression of wrinkles which may be caused on the inner face of the pipe or tube.
  • Fig. 1 is schematic diagram showing a sizing mill of three-role type to which a method of manufacturing a pipe or tube according to an embodiment of the present invention is applied.
  • a pipe or tube P, to be rolled is penetrated, and is rolled such that the outer diameter will have a predetermined value at the output side of the last stand #N.
  • Fig. 2 is a graph showing the results, studied by the inventors of the present invention, of the relationship between the average value ⁇ , in all stands #1 to #N, of the ratios between the curvature radii of the inner faces of positions, corresponding to the edge parts, of the pipe or tube P and the average inner radii, and the depth of wrinkles generated in the inner face of the pipe or tube P, in a case where the reduction ratio of the outer diameter is 50% or more. More specifically, the graph in Fig.
  • the average value ⁇ is a value obtained by measuring the curvature radius and the average inner radius of the inner face of a position corresponding to the edge part of the pipe or tube P by using a three-dimensional shape measuring device (manufactured by Tokyo Seimitsu Co., Ltd.) at the output side of each stand, and averaging, by the total number of stands, the ratios between the both calculated for the output side of each stand based on the measured values.
  • the average value ⁇ is obtained through the following procedures (a) to (c).
  • the winkle depth shown in Fig. 2 means the maximum value of wrinkle depth of the pipe or tube P measured at the output side of the sizing mill 1. It is a value measured by cutting away a part of the pipe or tube P after rolled as a sample, and micro-observing the section.
  • the rolling rolls 10 satisfying the conditions in which ⁇ of the pipe or tube P, to be rolled by the sizing mill 1, becomes 0.55 or more.
  • reasons for setting conditions for the rolling rolls 10 and the setting conditions will be explained specifically.
  • a tangent La (tangent of the groove profile near an edge part Ea) was drawn at the edge part Ea of a rolling roll 10a provided to each stand, and among edge parts of a rolling roll 10b adjacent the rolling roll 10a, a tangent Lb (tangent of groove profile near an edge part Eb) was drawn at the edge part Eb facing the edge part Ea, and an angle ⁇ o defined by the both tangents La and Lb was calculated. Note that as shown in Fig.
  • the groove profile of each rolling roll 10 has an arc with a radius R having the center O' offset (offset amount S) outward from the groove center O (center of the rolling pass line) (in a direction separating from the groove bottom C of the rolling roll 10), and the arc is shaped so as to directly cross a wall face F of the flange side of the rolling roll 10. Then, an edge part E (that is, the end part of the groove profile PR) of the rolling roll 10 corresponds to an end part of the arc of the radius R.
  • the angle ⁇ o is calculated geometrically based on the groove profile (the angles ⁇ o of three parts calculated for respective stands take the same value).
  • data plotted with "o” shows that ⁇ of the rolled pipe or tube P is 0.55
  • data plotted with " ⁇ ” shows that ⁇ of the rolled pipe or tube P is larger than 0.55
  • data plotted with "x” shows that ⁇ is less than 0.55.
  • ⁇ should be set to a predetermined value or more with respect to each t/D.
  • a value of ⁇ with which ⁇ is 0.55 to each t/D is approximated by a function (natural logarithmic function) where the variable is t/D, and then the groove profile of the rolling roll 10 is set such that ⁇ takes a value of the approximate function or more. More specifically, the groove profile of the rolling roll 10 is set such that the angle ⁇ satisfies the following formula (1): ⁇ ⁇ 1.13 ⁇ 10 ⁇ Ln t / D ⁇ 100 + 1.37 ⁇ 10 2
  • each rolling roll 10 has a single arc with a radius R, and the edge part E of the rolling roll 10 (that is, an end part of the groove profile PR) corresponds to an end part of the arc with the radius R, as described with reference to Fig. 6 .
  • the groove profile of each rolling roll 10 according to the present invention is not limited to this. It is possible to adopt rolling rolls having various groove profile as shown in Figs. 7(a) to 7(c).
  • Figs. 7(a) to 7(c) are diagrams each showing a part corresponding to the area circled by a dotted line in Fig. 6 , for the groove profile of grooved rolls according to other embodiments of the present invention. As shown in Fig.
  • each rolling roll 10 As a groove profile PR of each rolling roll 10 according to the present invention, it is possible to adopt a shape composed of a plurality of arcs with different radii and directly crossing the wall face F of the flange side.
  • the edge part E of the rolling roll 10 in such a case corresponds to an end part of an arc (radius Rn) positioned closest to the flange side.
  • the edge part E of the rolling roll 10 corresponds to an end part (end part of an art positioned closest to the flange side) of the arc constituting the groove profile PR.
  • a sizing mill of three-roll type has been exemplary described in this embodiment, the present invention is not limited to this type.
  • the present invention is applicable to sizing mills with a plurality of grooved rolls at each stand, such as four-roll type and two-roll type, in the similar manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Claims (1)

  1. Verfahren zum Herstellen eines Rohrs oder einer Röhre, welches den Schritt des Walzens des Rohrs oder der Röhre (P) unter Verwenden eines Maßwalzwerks (1) umfasst, das mehrere Walzgerüste (Nr. 1 - Nr. N) umfasst, wovon jedes mehrere Profilrollen (10) aufweist, wobei
    die Profilrollen so ausgelegt sind, dass bei Zeichnen von Tangenten (La, Lb) an einander zugewandten Kantenteilen (Ea, Eb) von benachbarten Profilrollen an jedem Walzgerüst unter der Annahme, dass ein Mindestwert von Winkeln, die durch die Tangenten in allen Walzgerüsten festgelegt sind, β (Grad) ist, ein Außendurchmesser des Rohrs oder der Röhre an einer Ausgangsseite des Maßwalzwerks D (mm) ist und eine Dicke des Rohrs oder der Röhre an der Ausgangsseite des Maßwalzwerks t (mm ist,
    dadurch gekennzeichnet, dass der Winkel β eine folgende Formel (1) erfüllt: β ≥ 1 , 13 x 10 x Ln t / D x 100 + 1 , 37 x 10 2
    Figure imgb0006
EP05721298A 2004-03-29 2005-03-23 Rohrherstellungsverfahren zum festdurchmesserwalzen Expired - Fee Related EP1731234B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004096821 2004-03-29
PCT/JP2005/005198 WO2005092531A1 (ja) 2004-03-29 2005-03-23 管の製造方法及び定径圧延装置

Publications (3)

Publication Number Publication Date
EP1731234A1 EP1731234A1 (de) 2006-12-13
EP1731234A4 EP1731234A4 (de) 2007-10-24
EP1731234B1 true EP1731234B1 (de) 2011-08-03

Family

ID=35056038

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05721298A Expired - Fee Related EP1731234B1 (de) 2004-03-29 2005-03-23 Rohrherstellungsverfahren zum festdurchmesserwalzen

Country Status (4)

Country Link
EP (1) EP1731234B1 (de)
JP (1) JP4650747B2 (de)
CN (1) CN100409953C (de)
WO (1) WO2005092531A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007111258A1 (ja) 2006-03-29 2007-10-04 Sumitomo Metal Industries, Ltd. ドライブシャフト用冷間仕上継目無鋼管およびその製造方法
WO2008123363A1 (ja) * 2007-03-30 2008-10-16 Sumitomo Metal Industries, Ltd. 一体成形型ドライブシャフト用冷間仕上継目無鋼管およびそれを用いたドライブシャフト、並びにその冷間仕上継目無鋼管の製造方法
CN101823075B (zh) * 2010-05-25 2013-04-24 攀钢集团有限公司 无缝钢管头尾壁厚削尖轧制方法
JP5003833B1 (ja) * 2011-03-31 2012-08-15 住友金属工業株式会社 絞り圧延用ロールの製造方法、及び、絞り圧延用ロール
WO2020189140A1 (ja) * 2019-03-15 2020-09-24 Ｊｆｅスチール株式会社 継目無角形鋼管の製造方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5728604A (en) * 1980-07-25 1982-02-16 Sumitomo Metal Ind Ltd Caliber roll
JPS61216805A (ja) * 1985-03-22 1986-09-26 Nippon Kokan Kk <Nkk> ストレッチ・レデューサーの圧延方法
DE69620310T2 (de) * 1995-01-10 2002-11-21 Sumitomo Metal Ind Verfahren und vorrichtung zum lochen nahtloser rohre
DE19506858C1 (de) * 1995-02-14 1996-01-18 Mannesmann Ag Walzenkalibrierung für ein Rohrreduzierwalzwerk
CN1141191C (zh) * 1995-05-10 2004-03-10 住友金属工业株式会社 用于无缝钢管的穿孔／轧制方法和设备
DE19539408C2 (de) * 1995-10-11 2003-03-20 Sms Demag Ag Kaliberkontur der Walze eines Rohrwalzwerkes
JP3070496B2 (ja) * 1996-11-26 2000-07-31 住友金属工業株式会社 管材の圧延ロールおよび圧延方法
DE10201717C1 (de) * 2002-01-18 2003-04-10 Sms Meer Gmbh Verfahren und Vorrichtung zum Walzen eines Rohres

Also Published As

Publication number Publication date
EP1731234A1 (de) 2006-12-13
CN100409953C (zh) 2008-08-13
JP4650747B2 (ja) 2011-03-16
EP1731234A4 (de) 2007-10-24
WO2005092531A1 (ja) 2005-10-06
CN1905958A (zh) 2007-01-31
JPWO2005092531A1 (ja) 2008-02-07

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