EP0809545A1 - Roll pass design system for a pipe-reducing rolling mill - Google Patents

Roll pass design system for a pipe-reducing rolling mill

Info

Publication number
EP0809545A1
EP0809545A1 EP96901717A EP96901717A EP0809545A1 EP 0809545 A1 EP0809545 A1 EP 0809545A1 EP 96901717 A EP96901717 A EP 96901717A EP 96901717 A EP96901717 A EP 96901717A EP 0809545 A1 EP0809545 A1 EP 0809545A1
Authority
EP
European Patent Office
Prior art keywords
roller
pipe
caliber
roll
flanks
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
EP96901717A
Other languages
German (de)
French (fr)
Other versions
EP0809545B1 (en
Inventor
Hans-Joachim Pehle
Peter Thieven
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 EP0809545A1 publication Critical patent/EP0809545A1/en
Application granted granted Critical
Publication of EP0809545B1 publication Critical patent/EP0809545B1/en
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
    • 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

Definitions

  • the invention relates to a roll caliber for the roll sets, each consisting of three rolls, of a multi-stand mandrel-less tube-reducing roll mill, in which the concave caliber contours of the rolls on each side of the caliber
  • corner or polygon formation can describe quadrangular and when using a three-roll caliber as a hexagonal cross-sectional shape with rounded edges
  • the proposal of the invention has the advantage that the local bulge increases the local contact pressure in each frame, so that a thickening of material in the middle of the caliber flank is counteracted. In the event of polygon formation, the finished tube is therefore without application of the invention. this point in the wall thickness increased compared to the rest of the tube circumference.
  • the proposed measures of the invention counteract this thickening According to a favorable proposal of the invention it is provided that the increase in the bulge corresponds to 1 to 5% of the tube wall thickness of the tubes to be rolled in the caliber
  • Wall thickening leads If the vertex of the protrusion is shifted towards the caliber jump according to the proposals of the invention, ie the protrusion is arranged asymmetrically in the flank of the calf, this disruptive effect is compensated for
  • FIG. 1 denotes the section from a roll of a roll set consisting of three rolls, the basic caliber 2 of which is shown concave or, in the present case, in the form of a circular arc, deviating from this basic caliber 2 and in In line with the teaching of German Patent 24 48 158, the two flank regions 4 of the basic calf 2 adjacent to the Ka 3 background are convexly curved, the size of the protrusion 5 being indicated by a.
  • the vertex 6 of each protrusion 5 is at an angle ⁇ to the center of Kahber 7 and measured from Kahberground 3 and is 30 to 35 degrees
  • the size of the protrusion a increases from the scaffold site i on the subsequent adjacent scaffold sites i + 1, i + 2, i + 3, i + 4, etc. by a constant or percentage-equal amount Mit i to i + n are the scaffolding places of a number of working scaffolds, of which a maximum of 12 are usefully provided with the increase in the size of the protrusion 5 according to the invention

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Control Of Metal Rolling (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

The invention concerns a roll pass design system for the three-roll sets in a multi-stand mandrel-less pipe-reducing rolling mill. In order to improve the roll design so that the flow of material in the pipe is locally influenced such that less extensive local pipe wall thickening occurs at critical points over the pipe periphery during reduction, the size (a) of the preliminary curvature (b) of the calibre flanks (4) of at least a plurality of roll sets arranged successively in the rolling direction increases by constant or proportionally equal amounts.

Description

Walzenkalibπerung für ein RohrreduzierwalzwerkRoll calibration for a pipe reducing mill
Beschreibungdescription
Die Erfindung betrfft eine Walzenkalibnerung für die aus jeweils drei Walzen bestehenden Walzensatze eines mehrgerustigen dornlosen Rohrreduzierwalzwerkes bei der die konkaven Kaliberkonturen der Walzen an beiden Kaliberflanken jederThe invention relates to a roll caliber for the roll sets, each consisting of three rolls, of a multi-stand mandrel-less tube-reducing roll mill, in which the concave caliber contours of the rolls on each side of the caliber
Walze konvex vorgewölbt sindRoller are convexly convex
Bei Rohrreduzierwalzwerken, insbesondere Streckreduzierwalzwerken, die ohne Innenwerkzeug arbeiten, tritt eine aus dem Walzprozeß resultierende Erscheinung auf, die ais Ecken- oder Polygonbildung bezeichnet ist Der Innendurchmesser des Rohres weist eine vom kreisrunden Querschnitt abweichende Form auf, die man bei Verwendung von zwei Walzenka bem als viereckige und bei der Verwendung eines Dreiwalzenkalibers als sechseckige Querschnittsform mit abgerundeten Kanten beschreiben kannIn pipe-reducing mills, especially stretch-reducing mills, which work without an internal tool, there occurs an appearance resulting from the rolling process, which is referred to as corner or polygon formation can describe quadrangular and when using a three-roll caliber as a hexagonal cross-sectional shape with rounded edges
Zur Vermeidung dieser sogenannten Polygonbildung im Rohrinneren sind verschiedene Vorschlage gemacht worden, die aber im wesentlichen zu unzulänglichen Ergebnissen führten oder einen großen Aufwand bedurftenVarious proposals have been made to avoid this so-called polygon formation in the interior of the tube, but these have essentially led to inadequate results or have required a great deal of effort
Ein in diesem Zusammenhang sinnvoller Vorschlag ist in der deutschen PatentschriftA reasonable suggestion in this context is in the German patent specification
24 48 158 beschrieben Ausgehend von der Erkenntnis daß das Maß der Ausprägung des Innenpolygons umso geringer ist je mehr Walzensatze in dem Rohrreduzierwalzwerk Verwendung finden, schlagt der bekannte Stand der Technik vor, die Verformungsverhaltnisse eines aus drei Walzen gebildeten Walzensatzes an die Verformungsverhaltnisse eines aus sechs Walzen gebildeten Walzensatzes anzunahern Zu diesem Zweck werden die Kaliberkonturen der Walzen an den Walzenflanken vorgewölbt24 48 158 described On the basis of the knowledge that the extent of the shape of the inner polygon is the smaller the more roller sets are used in the tube reducing roller mill, the known prior art proposes the deformation ratios of a roller set formed from three rollers to the deformation ratios of one consisting of six rollers formed roller set For this purpose, the caliber contours of the rolls are bulged on the roll flanks
Der Vorschlag des aus der DE 24 48 158 bekannten Standes der Technik hat nicht beachtet, daß die vorgeschlagene Ka berform allein nicht zur Homogenisierung des Verformungszustandes geeignet ist Dadurch wird bei der bekannten Losung derThe proposal of the prior art known from DE 24 48 158 has not taken into account that the proposed Ka berform alone is not suitable for homogenizing the state of deformation
Effekt der Kahberform auf den Materialfluß falsch vorausgesagt, es kommt zu ungunstigen Spannungszustanden im Rohr wahrend der Walzung und im Ergebnis zu am Fertigrohr anzutreffenden verdickten Stellen entlang des RohrumfangesEffect of the Kahber shape on the material flow incorrectly predicted, there are unfavorable stress conditions in the pipe during the rolling and, as a result, thickened places along the pipe circumference that can be found on the finished pipe
Ziel der vorliegenden Erfindung ist es, ausgehend von der deutschen PatentschriftThe aim of the present invention is based on the German patent specification
24 48 158 und unter Zugrundelegung der dort vorgeschlagenen Ka berform, die Walzenkalibrierung für ein Rohrreduzierwalzwerk so zu verbessern, daß der Matenalfluß im Rohr örtlich so beeinflußt wird, daß eine geringere lokale Rohrwandverdickung beim Reduzieren an kritischen Stellen entlang des Rohrumfanges stattfindet und dadurch die am Fertigrohr anzutreffenden verdickten24 48 158 and on the basis of the Ka overform proposed there to improve the roll calibration for a pipe reducing mill so that the material flow in the pipe is influenced locally so that a lower local pipe wall thickening takes place when reducing at critical points along the pipe circumference and thereby on the finished pipe to be found thickened
Stellen vermieden werdenPlaces to be avoided
Zur Losung dieser Aufgabe wird erfindungsgemaß vorgeschlagen, daß bei der bekannten Ka berkonturausbildung die Große der Vorwolbung der Kaliberflanken in Walzrichtung aufeinanderfolgender Walzensatze um konstante oder prozentual gleicheTo solve this problem it is proposed according to the invention that in the known Ka contour contour the size of the bulging of the caliber flanks in the rolling direction of successive sets of rolls by constant or percentage equal
Betrage zunimmt Diesem Vorschlag liegt die Erkenntnis zugrunde, daß die bekannte Vorwolbung auf den Stofffluß ohne Wirkung bleibt, wenn nicht in jedem Gerüst einer Anzahl von aufeinanderfolgenden Arbeitsgerusten durch die Vorwolbung mehr Reduktion in der Ka berflanke stattfindet, als im Kahbergrund oder Kalibersprung In Konsequenz muß die Hohe der Vorwolbung also von Gerüst zu Gerüst in derAmounts increase This proposal is based on the knowledge that the known bulge on the material flow has no effect if there is not a reduction in the scaffold flank in each frame of a number of successive working scaffolds due to the bulge than in the calf background or caliber jump Height of the protrusion from frame to frame in the
Kaliberreihe erhöht werden Durch den Vorschlag der Erfindung ergibt sich als Vorteil daß die lokale Vorwolbung den lokalen Kontaktdruck in jedem Gerüst erhöht, so daß einer Materialverdickung in der Mitte der Kaliberflanke entgegengewirkt wird Am Fertigrohr ist im Falle des Auftretens einer Polygonbildung also ohne Anwendung der Erfindung, diese Stelle in der Wanddicke gegenüber dem Rest des Rohrumfanges vergrößert Die vorgeschlagenen Maßnahmen der Erfindung wirken dieser Verdickung entgegen Nach einem gunstigen Vorschlag der Erfindung ist vorgesehen daß die Zunahme der Vorwolbung 1 bis 5 % der Rohrwanddicke der im Kaliber zu walzenden Rohre entsprichtCaliber series are increased. The proposal of the invention has the advantage that the local bulge increases the local contact pressure in each frame, so that a thickening of material in the middle of the caliber flank is counteracted. In the event of polygon formation, the finished tube is therefore without application of the invention. this point in the wall thickness increased compared to the rest of the tube circumference. The proposed measures of the invention counteract this thickening According to a favorable proposal of the invention it is provided that the increase in the bulge corresponds to 1 to 5% of the tube wall thickness of the tubes to be rolled in the caliber
In einer weiteren Ausgestaltung der Erfindung wird vorgeschlagen den Scheitelpunkt der Vorwolbung jeder Ka berflanke, ausgehend vom Ka bergrund bezogen auf den Kalibermittelpunkt des Walzensatzes um 30 bis 35 Grad in Richtung Walzensprung verschoben anzuordnen Durch diese Maßnahme wird vermieden, daß der Stofffluß durch eine in der Mitte oder zum Kalibergrund hin positionierte Vorwolbung starker zum Kalibersprung hin gerichtet wird und dort zu unerwünschten lokalenIn a further embodiment of the invention it is proposed to arrange the apex of the protrusion of each Ka flank, starting from the Ka ground based on the caliber center point of the roller set, by 30 to 35 degrees in the direction of the roller jump. This measure prevents the material flow from being in the middle or protrusion positioned towards the caliber base is directed more strongly towards the caliber jump and there towards undesired local ones
Wandverdickungen fuhrt Wenn der Scheitelpunkt der Vorwolbung nach den Vorschlagen der Erfindung in Richtung Kalibersprung verschoben wird also die Vorwolbung asymmetrisch in der Kahberflanke angeordnet ist, wird dieser störende Effekt ausgeglichenWall thickening leads If the vertex of the protrusion is shifted towards the caliber jump according to the proposals of the invention, ie the protrusion is arranged asymmetrically in the flank of the calf, this disruptive effect is compensated for
Es hat sich als vorteilhaft gezeigt, wenn nach einem weiteren Merkmal der Erfindung von den den Vorgerusten folgenden Arbeitsgeruste eine zusammenhangende Anzahl von maximal 12 Gerüsten mit den Vorwolbungen der Kaliberflanken versehen ist Mit den Maßnahmen der vorliegenden Erfindung wird insbesondere beim Streckreduzieren von Stahlrohren die Innenpolygonbildung weitgehend dadurch vermieden, daß der Mateπalfluß im Rohr in der erforderlichen Weise beeinflußt wird Im Ergebnis sind Rohre mit homogenisiertem Verformungszustand zu erwarten die weitgehend ohne Innenpolygon, also über dem Umfang gleichmäßigen Wanddicken gewalzt sindIt has been shown to be advantageous if, according to a further feature of the invention, a coherent number of a maximum of 12 scaffolds from the working scaffolds following the preliminary scaffolds is provided with the protrusions of the caliber flanks avoided that the material flow in the pipe is influenced in the required manner. As a result, pipes with a homogenized deformation state are to be expected which are largely rolled without an inner polygon, that is to say uniform wall thicknesses over the circumference
In der zeichnerischen Darstellung ist grob vereinfacht die vorliegende Erfindung dargestellt und wird nachfolgend erläutert Es zeigtIn the drawing, the present invention is roughly simplified and is explained below. It shows
Fig 1 Die Kaliberkontur einer der drei Walzen eines WalzensatzesFig 1 The caliber contour of one of the three rolls of a set of rolls
Fig 2 in einem Diagramm die Große der Vorwolbung über den Gerustplatzen2 in a diagram the size of the protrusion above the scaffold sites
In Figur 1 ist mit 1 der Ausschnitt aus einer Walze eines aus drei Walzen bestehenden Walzeπsatzes bezeichnet, deren Grundkaliber 2 konkav bzw im vorliegenden Fall kreisbogenformig dargestellt ist Abweichend von diesem Grundkaliber 2 und in Anlehnung an die Lehre des deutschen Patentes 24 48 158 sind die beiden neben dem Ka bergrund 3 hegenden Flankenbereiche 4 des Grundkahbers 2 konvex vorgewölbt, wobei die Große der Vorwolbung 5 mit a angegeben ist Der Scheitelpunkt 6 jeder Vorwolbung 5 hegt bei einem Winkel α, bezogen auf den Kahbermittelpunkt 7 und gemessen vom Kahbergrund 3 und betragt 30 bis 35 GradIn FIG. 1, 1 denotes the section from a roll of a roll set consisting of three rolls, the basic caliber 2 of which is shown concave or, in the present case, in the form of a circular arc, deviating from this basic caliber 2 and in In line with the teaching of German Patent 24 48 158, the two flank regions 4 of the basic calf 2 adjacent to the Ka 3 background are convexly curved, the size of the protrusion 5 being indicated by a. The vertex 6 of each protrusion 5 is at an angle α to the center of Kahber 7 and measured from Kahbergrund 3 and is 30 to 35 degrees
Unter Hinweis auf Figur 2 steigt die Große der Vorwolbung a vom Gerustplatz i ausgehend auf den nachfolgenden benachbarten Gerustplatzen i + 1 , i + 2, i + 3, i + 4 usw um einen konstanten oder prozentual gleichen Betrag an Mit i bis i + n sind die Gerustplatze einer Anzahl von Arbeitsgerusten bezeichnet, von denen maximal 12 sinnvoller Weise mit der erfindungsgemaßen Zunahme der Große der Vorwolbung 5 versehen sind With reference to FIG. 2, the size of the protrusion a increases from the scaffold site i on the subsequent adjacent scaffold sites i + 1, i + 2, i + 3, i + 4, etc. by a constant or percentage-equal amount Mit i to i + n are the scaffolding places of a number of working scaffolds, of which a maximum of 12 are usefully provided with the increase in the size of the protrusion 5 according to the invention

Claims

PatentansprücheClaims
1 Walzenkahbπerung für die aus jeweils drei Walzen bestehenden Walzensatze eines mehrgerustigen dornlosen Rohrreduzierwalzwerkes, bei der die konkaven1 roller bearing for the roller sets, each consisting of three rollers, of a multi-frame mandrel-less tube-reducing roller mill, in which the concave
Ka berkonturen der Walzen an beiden Kaliberflanken jeder Walze konvex vorgewölbt sind, dadurch gekennzeichnet, daß die Große (a) der Vorwolbung (5) der Kaliberflanken (4) mindestens mehrerer in Walzrichtung aufeinanderfolgender Walzensatze um konstante oder prozentual gleiche Betrage zunimmtKa overcontours of the rolls on both caliber flanks of each roll are convexly bulged, characterized in that the size (a) of the protrusion (5) of the caliber flanks (4) increases by at least several equal sets of at least several successive sets of rolls
2 Walzenkalibnerung nach Anspruch 1 , dadurch gekennzeichnet, daß die Zunahme der Vorwolbung (5) 1 bis 5 % der Rohrwanddicke der im2 roller caliber according to claim 1, characterized in that the increase in the bulge (5) 1 to 5% of the tube wall thickness in the
Kaliber zu walzenden Rohre entsprichtCorresponds to pipes to be rolled
3 Walzenkalibnerung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß der Scheitelpunkt (6) der Vorwolbungen (5) jeder Kahberflanke (4) ausgehend vom Ka bergrund (3) und bezogen auf den Kahbermittelpunkt (7) des Walzensatzes um 30 bis 35 Grad in Richtung Walzensprung (8) verschoben angeordnet ist3 roller caliber according to claim 1 and 2, characterized in that the apex (6) of the protrusions (5) of each Kahber flank (4) starting from the Ka overground (3) and based on the Kahber center (7) of the roller set by 30 to 35 degrees in Direction of the roller jump (8) is arranged shifted
4 Walzenkalibnerung nach Anspruch 1 bis 3, dadurch gekennzeichnet daß von den den Vorgerusten folgenden Arbeitsgeruste (i bis i+n) eine zusammenhangende Anzahl von maximal 12 Gerüsten mit den Vorwolbungen (5) der Kaliberflanken (4) versehen ist 4 roller caliber according to claim 1 to 3, characterized in that of the following working scaffolding (i to i + n) a contiguous number of a maximum of 12 stands with the protrusions (5) of the caliber flanks (4) is provided
EP96901717A 1995-02-14 1996-02-02 Roll pass design system for a pipe-reducing rolling mill Expired - Lifetime EP0809545B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19506858 1995-02-14
DE19506858A DE19506858C1 (en) 1995-02-14 1995-02-14 Roll pass design for 3-roll passes of mandrel-less tube reducing mills
PCT/DE1996/000205 WO1996025249A1 (en) 1995-02-14 1996-02-02 Roll pass design system for a pipe-reducing rolling mill

Publications (2)

Publication Number Publication Date
EP0809545A1 true EP0809545A1 (en) 1997-12-03
EP0809545B1 EP0809545B1 (en) 1999-04-14

Family

ID=7755188

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96901717A Expired - Lifetime EP0809545B1 (en) 1995-02-14 1996-02-02 Roll pass design system for a pipe-reducing rolling mill

Country Status (10)

Country Link
US (1) US5816092A (en)
EP (1) EP0809545B1 (en)
CN (1) CN1070394C (en)
AT (1) ATE178816T1 (en)
CZ (1) CZ286696B6 (en)
DE (2) DE19506858C1 (en)
ES (1) ES2129953T3 (en)
RU (1) RU2117540C1 (en)
UA (1) UA45991C2 (en)
WO (1) WO1996025249A1 (en)

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Publication number Priority date Publication date Assignee Title
CN112007951A (en) * 2019-05-31 2020-12-01 宝山钢铁股份有限公司 Method for forming round pipe hole pattern of high-frequency straight welded pipe

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DE19758107A1 (en) * 1997-12-17 1999-06-24 Mannesmann Ag Multi-stand mandrelless stretch-reducing mill
US8166789B2 (en) * 2004-01-21 2012-05-01 Sumitomo Metal Industries, Ltd. Pipe or tube reducing mill and roll for reducing mill
EP1731234B1 (en) * 2004-03-29 2011-08-03 Sumitomo Metal Industries, Ltd. Tube manufacturing method for fixed diameter rolling
CN1695839B (en) * 2004-08-17 2010-07-07 江苏包罗铜材集团股份有限公司 Roller trio skew rolling method for cold perforating and cold chambering ingot
JP4441912B2 (en) * 2005-03-28 2010-03-31 住友金属工業株式会社 Mandrel mill rolling method
EP2127768B1 (en) * 2007-02-08 2014-10-01 Nippon Steel & Sumitomo Metal Corporation Reducer pass roll and reducer
AT507596B1 (en) * 2008-11-20 2011-04-15 Voestalpine Tubulars Gmbh & Co Kg METHOD AND DEVICE FOR PRODUCING STEEL TUBES WITH SPECIAL CHARACTERISTICS
JP5849895B2 (en) * 2012-08-21 2016-02-03 新日鐵住金株式会社 Drawing rolling device and roll for drawing rolling device
CN104550263B (en) * 2014-12-18 2017-05-10 天津商业大学 Pass design method for producing seamless steel tubes by utilizing five-rack continuous rolling mill
CN113996663B (en) * 2021-12-31 2022-03-11 太原科技大学 Method and system for distributing and correcting reducing rate of seamless pipe tension reducing process

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Publication number Priority date Publication date Assignee Title
CN112007951A (en) * 2019-05-31 2020-12-01 宝山钢铁股份有限公司 Method for forming round pipe hole pattern of high-frequency straight welded pipe

Also Published As

Publication number Publication date
UA45991C2 (en) 2002-05-15
RU2117540C1 (en) 1998-08-20
DE59601666D1 (en) 1999-05-20
CZ244797A3 (en) 1997-11-12
US5816092A (en) 1998-10-06
CN1174527A (en) 1998-02-25
ATE178816T1 (en) 1999-04-15
CZ286696B6 (en) 2000-06-14
DE19506858C1 (en) 1996-01-18
WO1996025249A1 (en) 1996-08-22
EP0809545B1 (en) 1999-04-14
CN1070394C (en) 2001-09-05
ES2129953T3 (en) 1999-06-16

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