EP0798057B1 - Calibration of the shoulder roll of an Assel mill - Google Patents
Calibration of the shoulder roll of an Assel mill Download PDFInfo
- Publication number
- EP0798057B1 EP0798057B1 EP97250099A EP97250099A EP0798057B1 EP 0798057 B1 EP0798057 B1 EP 0798057B1 EP 97250099 A EP97250099 A EP 97250099A EP 97250099 A EP97250099 A EP 97250099A EP 0798057 B1 EP0798057 B1 EP 0798057B1
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- EP
- European Patent Office
- Prior art keywords
- shoulder
- radius
- exit
- entry
- 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.)
- Expired - Lifetime
Links
- 230000007704 transition Effects 0.000 claims description 12
- 238000005096 rolling process Methods 0.000 claims description 6
- 238000005098 hot rolling Methods 0.000 claims description 2
- 238000009499 grossing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 241000131095 Oniscidea Species 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
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-perforated hollow bodies over a mandrel, with three staggered by 120 ° against each other Rolling axis inclined and arranged with each pivoted rollers to the rolling axis an inlet part upstream of the shoulder, one downstream of the shoulder Outlet part, as well as continuous transitions between the parts of each Shoulder roller.
- Shoulder rollers of the type described above work on the principle of Cross rolling across mandrel bars. Woodlice rollers serve to stretch a relative thick-walled hollow body in a relatively short forming zone in which one Wall thickness reduction is carried out.
- the shoulder rollers of the woodlouse mill consist essentially of an inlet part, which usually consists of a Inlet cone with low inclination is formed from the working part with the Working shoulder and from the smoothing part or the outlet part.
- the inlet cone or the The inlet part has the task of grasping the billet, turning it and using a steady feed on the mandrel bar.
- the work section also the work shoulder or shoulder section, is connected to the inlet section called, a step-like change in the roller diameter of its step height depends on the material to be processed. The higher the shoulder or the step is, the greater the material stress.
- the purpose of the shoulder is to be high Wall thickness reduction within a relatively narrow range perform to the favorable influence of the dimensional stability of the thick-walled Forward tube towards the distribution of tangential and axially directed changes in shape use.
- the subsequent outlet part has the purpose of partially removing the tube from the mandrel bar to loosen and smooth the surface of the pipe.
- FIG. 2 is a diagram The degree of stretch distribution over the area of the forming zone is represented logarithmically. To You can see a sharp rise in the curve, then a sharp decline and then again an increase followed by a sharp drop in the curve. This curve is to be interpreted as an unfavorable flow condition in the forming zone.
- the well-known solution limits the feed efficiency and the d / s ratio through these flow conditions the troop.
- a calibration of the shoulder rolls of a woodlead inclined rolling mill is proposed according to the invention, which is characterized in that the transition from the inlet part to the outlet part is determined by three radii which merge tangentially into one another and into the inlet and outlet part, the mean radius of which is greater than the transition radius R 2 than the input radius R 1 and smaller than the output radius R 3 and whose transition radius R 2 and output radius R 3 have the same directions of curvature, the radii R 1-3 being described by the shoulder height H s of the woodlayer as follows: R 1 ⁇ 0.7-0.9H s R 2nd ⁇ 1.9-2.1 ⁇ H s R 3rd ⁇ 12 - 21H s and the following applies to the calculation of the shoulder height H s from the bowl diameter D L and the ratio of the hollow block diameter / hollow block wall [D H / S H ]:
- the optimized forming conditions can take into account today's theoretical calculation of the discharge speed of the billet from the woodleather Feed efficiency will be greater than 1.
- the tolerances both in thick-walled as well as in the thin-walled dimension range can be proposed by the Improve invention; the risk of triangulation is reduced by reducing the Axial resistance reduced, so that an improved product can be expected overall is.
- the deformation part of a woodlice 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 is the center point of the exit radius R 3 of 100 mm, which merges tangentially into the transition radius R 2 .
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Description
Die Erfindung betrifft eine Kalibrierung der Schulterwalzen eines Assel-Schrägwalzwerkes zum Warmwalzen von Rohrluppen aus vorgelochten Hohlkörpern über einen Dorn, mit drei um 120° gegeneinander versetzten, gegenüber der Walzachse geneigt und zur Walzachse geschwenkt angeordneten Walzen mit jeweils einem der Schulter vorgeordnetem Einlaufteil, einem der Schulter nachgeordneten Auslaufteil, sowie kontinuierlichen Übergängen zwischen den Teilen jeder Schulterwalze.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-perforated hollow bodies over a mandrel, with three staggered by 120 ° against each other Rolling axis inclined and arranged with each pivoted rollers to the rolling axis an inlet part upstream of the shoulder, one downstream of the shoulder Outlet part, as well as continuous transitions between the parts of each Shoulder roller.
Schulterwalzen der eingangs beschriebenen Art arbeiten nach dem Prinzip des Schrägwalzens über Dornstangen. Asselwalzen dienen zur Streckung eines relativ dickwandigen Hohlkörpers in einer verhältnismäßig kurzen Umformzone, in der eine Wanddickenreduktion durchgeführt wird. Die Schulterwalzen des Asselwalzwerkes bestehen im wesentlichen aus einem Einlaufteil, der in der Regel aus einem Einlaufkegel mit geringer Neigung gebildet wird, aus dem Arbeitsteil mit der Arbeitsschulter und aus dem Glätteil bzw. dem Auslaufteil. Der Einlaufkegel bzw. der Einlaufteil hat die Aufgabe, die Luppe zu erfassen, sie zu drehen und mit einem stetigen Vorschub auf die Dornstange aufzuziehen.Shoulder rollers of the type described above work on the principle of Cross rolling across mandrel bars. Woodlice rollers serve to stretch a relative thick-walled hollow body in a relatively short forming zone in which one Wall thickness reduction is carried out. The shoulder rollers of the woodlouse mill consist essentially of an inlet part, which usually consists of a Inlet cone with low inclination is formed from the working part with the Working shoulder and from the smoothing part or the outlet part. The inlet cone or the The inlet part has the task of grasping the billet, turning it and using a steady feed on the mandrel bar.
An den Einlaufteil schließt sich der Arbeitsteil, auch Arbeitsschulter oder Schulterteil genannt, an, eine stufenartige Änderung des Walzendurchmessers deren Stufenhöhe von dem zu verarbeitenden Material abhängig ist. Je höher die Schulter bzw. die Stufe ist, um so größer ist die Materialbeanspruchung. Zweck der Schulter ist es, eine hohe Wanddickenreduktion innerhalb eines relativ eng begrenzten Bereiches durchzuführen, um den günstigen Einfluß der Formstabilität des dickwandigen Vorrohres auf die Verteilung von tangential und axial gerichteter Formänderung zu nutzen.The work section, also the work shoulder or shoulder section, is connected to the inlet section called, a step-like change in the roller diameter of its step height depends on the material to be processed. The higher the shoulder or the step is, the greater the material stress. The purpose of the shoulder is to be high Wall thickness reduction within a relatively narrow range perform to the favorable influence of the dimensional stability of the thick-walled Forward tube towards the distribution of tangential and axially directed changes in shape use.
Der anschließende Auslaufteil hat den Zweck, das Rohr teilweise von der Dornstange zu lösen und die Oberfläche des Rohres zu glätten.The subsequent outlet part has the purpose of partially removing the tube from the mandrel bar to loosen and smooth the surface of the pipe.
Bei herkömmlichen Kalibrierungen von Schulterwalzen wird die Kaliberkontur von Einlaufteil, Arbeitsteil und Glätteil aus geraden Linienelementen zusammengesetzt, die mit kontinuierlichen Übergängen in Bogenform miteinander verbunden sind. So ist eine Walzenkalibrierung bekannt, bei der zwei kleine Radien tangential sowohl ineinander als auch in den Einlauf- und Auslaufteil übergehen.With conventional shoulder roller calibrations, the caliber contour of Inlet part, working part and smoothing part composed of straight line elements that are connected to one another with continuous transitions in the form of an arch. So is one Roll calibration known in which two small radii are tangent to each other as well as in the inlet and outlet part.
Der Nachteil dieser Schultergeometrie ist mit einer ungünstigen Streckgradverteilung in der Umformzone begründet. In der Figur 2 ist in einem Diagramm die Streckgradverteilung über den Bereich der Umformzone logarithmisch dargestellt. Zu erkennen ist ein starker Anstieg der Kurve, danach ein starker Abfall und anschließend wieder ein Anstieg mit anschließend starkem Abfall der Kurve. Dieser Kurvenverlauf ist als ungünstige Fließbedingung in der Umformzone zu deuten. Die bekannte Lösung begrenzt durch diese Fließbedingungen den Vorschubwirkungsgrad und das d/s-Verhältnis der Luppe.The disadvantage of this shoulder geometry is an unfavorable stretch degree distribution established in the forming zone. In Figure 2 is a diagram The degree of stretch distribution over the area of the forming zone is represented logarithmically. To You can see a sharp rise in the curve, then a sharp decline and then again an increase followed by a sharp drop in the curve. This curve is to be interpreted as an unfavorable flow condition in the forming zone. The well-known solution limits the feed efficiency and the d / s ratio through these flow conditions the troop.
Ausgehend von dem bekannten Stand der Technik und den geschilderten Nachteilen ist es Aufgabe der vorliegenden Erfindung, die Streckgradverteilung im umformtechnisch kritischen Bereich der Walze zu optimieren und dabei gleichzeitig eine verbesserte Glättwirkung zu erhalten.Based on the known prior art and the disadvantages described it is an object of the present invention to determine the degree of stretching in the to optimize the area of the roll that is critical in terms of forming technology and at the same time to get an improved smoothing effect.
Zur Lösung der Aufgabe wird erfindungsgemäß eine Kalibrierung der Schulterwalzen
eines Asselschrägwalzwerkes vorgeschlagen, die dadurch gekennzeichnet ist,
daß der Übergang vom Einlaufteil zum Auslaufteilteil durch drei tangential ineinander
und in den Ein- und Auslaufteil übergehende Radien bestimmt wird, deren mittlerer
Radius als Übergangsradius R2 größer als der Eingangsradius R1 und kleiner als der
Ausgangsradius R3 ist und deren Übergangsradius R2 und Ausgangsradius R3 gleiche
Krümmungsrichtungen aufweisen, wobei die Radien R1-3 durch die Schulterhöhe Hs
der Asselwalze wie folgt beschrieben ist:
Durch die vorgeschlagene Geometrie der Umformzone ändert sich die Charakteristik der Kurve für die Streckgradverteilung deutlich. Bei gleichzeitig begünstigten Fließbedingungen in der Umformzone und einer Glättwirkung im Auslauf des Schulterbereiches steigt der Vorschubwirkungsgrad. Das ist gleichbedeutend mit einem Anstieg der Leistungsfähigkeit eines Asselwalzwerkes, das mit der erfindungsgemäßen Kalibrierung der Walzen ausgerüstet ist. Versuche haben gezeigt, daß der Vorschubwirkungsgrad von heute 0,7 bis 0,9 auf 1,48 bis 1,68 angestiegen ist. Durch die optimierten Umformbedingungen kann -unter Berücksichtigung der heutigen theoretischen Berechnung der Auslaufgeschwindigkeit der Luppe aus der Asselwalzeder Vorschubwirkungsgrad größer 1 werden. Die Toleranzen sowohl im dickwandigen als auch im dünnwandigen Dimensionsbereich lassen sich durch den Vorschlag der Erfindung verbessern; die Triangulationsgefahr wird durch Verringerung des Axialwiderstandes gemindert, so daß insgesamt ein verbessertes Produkt zu erwarten ist.The characteristic changes due to the proposed geometry of the forming zone the curve for the degree of stretch distribution clearly. With beneficiaries at the same time Flow conditions in the forming zone and a smoothing effect in the outlet of the The feed efficiency increases. That is equivalent to an increase in the performance of an Assel mill, which with the calibration of the rollers according to the invention is equipped. Experiments have shown that the feed efficiency has risen from 0.7 to 0.9 today to 1.48 to 1.68. The optimized forming conditions can take into account today's theoretical calculation of the discharge speed of the billet from the woodleather Feed efficiency will be greater than 1. The tolerances both in thick-walled as well as in the thin-walled dimension range can be proposed by the Improve invention; the risk of triangulation is reduced by reducing the Axial resistance reduced, so that an improved product can be expected overall is.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend beschrieben. Es zeigt:
- Fig. 1
- eine erfindungsgemäße Walzenkalibrierung mit drei ineinander übergehenden Radien,
- Fig. 2
- in einem Digramm die Charakteristik herkömmlicher Schultergeometrie und
- Fig. 3
- ein Diagramm der Charakteristik einer erfindungsgemäßen Asselschultergeometrie.
- Fig. 1
- a roll calibration according to the invention with three merging radii,
- Fig. 2
- the characteristics of conventional shoulder geometry and
- Fig. 3
- a diagram of the characteristics of a woodlouse shoulder geometry according to the invention.
In der Zeichnungsfigur 1 ist der Verformungsteil einer Asselwalze im Schulterbereich dargestellt. Der Einlaufbereich ist mit E bezeichnet, der Auslaufbereich mit A. Vom Einlaufteil E ausgehend ist die Walze mit dem Eingangsradius R1 von 6 mm gekrümmt und geht tangential in den Übergangsradius R2 von 15 mm über, dessen Radienmittelpunkt auf der dem Radienmittelpunkt des Eingangsradius R1 entgegengesetzten Seite liegt. Auf der gleichen Seite der Kurve liegt der Mittelpunkt des Ausgangsradius R3 von 100mm, der tangential in den Übergangsradius R2 übergeht. Somit ergibt sich eine Kontur der Asselwalzenschulter, die geprägt ist durch einen steil ansteigenden Eingangsradius und einen gegen 0 auslaufenden Ausgangsradius, mit einem Übergangsradius. Durch die Wahl dieser Radien ergibt sich zu Beginn der Umformung, im ersten Drittel der Umformzone ein hoher Streckgrad, während auf den letzten beiden Dritteln ein stetig nachlassender, bis gegen 0 gehender Streckgrad zu verzeichnen ist. Dadurch werden die Streckungsverhältnisse in der Umformzone vergleichmäßigt und im Auslauf entsteht eine verbesserte Glättwirkung. Im Diagramm nach Figur 3 ist deutlich zu erkennen, daß der bei einer Kalibrierung nach dem Stand der Technik entstehende Abfall der die Streckung charakterisierenden Kurve im Schulterbereich der Walze entfällt, die Kurve fällt flach ab, was gleichbedeutend mit einer gleichmäßig und sanft abnehmenden Streckung ist.In the drawing figure 1, the deformation part of a woodlice is shown in the shoulder area. The run-in area is designated E, the run-out area is A. Starting from the run-in part E, 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. On the same side of the curve is the center point of the exit radius R 3 of 100 mm, which merges tangentially into the transition radius R 2 . This results in a contour of the woodleaf shoulder, which is characterized by a steeply increasing input radius and an output radius tapering towards 0, with a transition radius. The choice of these radii results in a high degree of stretching in the first third of the forming zone at the beginning of the forming process, while the last two thirds show a continuously decreasing degree of stretching that goes down to 0. As a result, the aspect ratios in the forming zone are evened out and an improved smoothing effect occurs in the outlet. The diagram in FIG. 3 clearly shows that the drop in the curve characterizing the stretching in the shoulder region of the roll, which occurs during a calibration according to the prior art, is omitted, the curve drops flat, which is synonymous with a uniformly and gently decreasing stretching.
Claims (1)
- The calibration of the shoulder rolls of an Assel cross-rolling mill for hot-rolling thin-walled tube blanks of pre-pierced hollow bodies by means of a mandrel, having at least three rolls which are offset by 120° relative to each other and are inclined with respect to the roller axis and are arranged pivoted towards the roller axis, each with an entry part preceding the shoulder, an exit part succeeding the shoulder, and continuous transitions between the parts of each shoulder roll,
characterised in that
the transition from the entry part to the exit part is determined by three radii which merge tangentially into each other and into the entry and exit parts, the middle radius of which as the transition radius R2 is greater than the entry radius R1 and less than the exit radius R3, and the transition radius R2 and exit radius R3 of which have the same directions of curvature, the radii R1-3 being described as follows by the shoulder height Hs of the Assel roll:
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19613715 | 1996-03-27 | ||
| DE19613715A DE19613715C1 (en) | 1996-03-27 | 1996-03-27 | Calibration of slant rolling mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0798057A1 EP0798057A1 (en) | 1997-10-01 |
| EP0798057B1 true EP0798057B1 (en) | 2000-05-10 |
Family
ID=7790597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97250099A Expired - Lifetime EP0798057B1 (en) | 1996-03-27 | 1997-03-25 | Calibration of the shoulder roll of an Assel mill |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0798057B1 (en) |
| DE (2) | DE19613715C1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19725314C1 (en) * | 1997-06-09 | 1998-09-24 | Mannesmann Ag | Skew-rolling mill for elongation of seamless hollow blank heated to forming temperature |
Family Cites Families (5)
| 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 |
| DE926541C (en) * | 1952-08-12 | 1955-04-21 | Rheinische Roehrenwerke Ag | Angled shoulder mill for reducing the stretch, preferably thick-walled tubes |
| SE329584B (en) * | 1966-06-16 | 1970-10-19 | Skf Svenska Kullagerfab Ab | |
| DE3406841A1 (en) * | 1984-02-23 | 1985-09-12 | Mannesmann AG, 4000 Düsseldorf | ROLLER ADJUSTMENT FOR A THREE-ROLLER BEVEL BEARING MILL |
| DE19536637C1 (en) * | 1995-09-22 | 1997-01-16 | Mannesmann Ag | Calibration for shoulder rolls in cross rolling mills |
-
1996
- 1996-03-27 DE DE19613715A patent/DE19613715C1/en not_active Expired - Fee Related
-
1997
- 1997-03-25 EP EP97250099A patent/EP0798057B1/en not_active Expired - Lifetime
- 1997-03-25 DE DE59701618T patent/DE59701618D1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE19613715C1 (en) | 1997-07-24 |
| DE59701618D1 (en) | 2000-06-15 |
| EP0798057A1 (en) | 1997-10-01 |
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