EP0882526B1 - Verfahren und Vorrichtung zur Vermeidung oder Verminderung trompetenförmiger Aufweitungen am Rohrende beim Schrägwalzen von dünnwandigen Rohren - Google Patents
Verfahren und Vorrichtung zur Vermeidung oder Verminderung trompetenförmiger Aufweitungen am Rohrende beim Schrägwalzen von dünnwandigen Rohren Download PDFInfo
- Publication number
- EP0882526B1 EP0882526B1 EP98250181A EP98250181A EP0882526B1 EP 0882526 B1 EP0882526 B1 EP 0882526B1 EP 98250181 A EP98250181 A EP 98250181A EP 98250181 A EP98250181 A EP 98250181A EP 0882526 B1 EP0882526 B1 EP 0882526B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rolling
- rolls
- reduction
- assel
- mill
- 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
- 238000005096 rolling process Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims description 28
- 230000009467 reduction Effects 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 17
- 230000008569 process Effects 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 3
- 241000973497 Siphonognathus argyrophanes Species 0.000 claims 5
- 230000007246 mechanism Effects 0.000 claims 2
- 230000002265 prevention Effects 0.000 abstract description 2
- 230000005526 G1 to G0 transition Effects 0.000 description 5
- 241000131095 Oniscidea Species 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000001960 triggered effect Effects 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 method and an apparatus for performing the Procedure for avoiding or reducing trumpet-shaped widenings on Pipe end when diagonally rolling thin-walled pipes on an Assel mill.
- Such a method and such Device are according to the preambles of Claims 1 and 7 from DE 44 28 530 A known.
- the driving force for this expansion is the material displacement per unit of time that occurs in the absence of longitudinal tensile stress, which is mainly influenced by the degree of wall reduction and the feed angle, whereby the geometry of the hollow block used also plays an important role in preventing the undesired flow of material. If the wall thickness of the bobble exceeds a certain dimension or if its ratio D L / S L falls below a certain amount, for example 10, the expansion-related formation of trumpets on the bobble head is small or practically imperceptible.
- the object of the present invention is to provide a method and an apparatus for Perform the method to find the one with which the trumpet-shaped Expansion of thin-walled blanks at their front end when rolled into one Woodlice mill avoided or at least in its dimensions on a harmless Dimension can be reduced.
- the invention proposes that when the front hollow block area in the woodlouse mill the radial forming of the blanks compared to the stationary rolling condition and / or that Section modulus at the head end due to obstruction of the tangential material flow is increased. This will cause the transient Phase during the rolling of the tube blank in the wood mill, conditions created, that come close to the stationary rolling condition.
- the material flow in tangential Direction is reduced so that the missing tension in the axial direction is partially compensated. The result is a reduction depending on the tube wall thickness or avoided formation of trumpets at the front end of the cap.
- the opening path ⁇ DHP is upwards as a result limited that the gripping of the hollow block by the rollers in the inlet part or in The stretched part must still be guaranteed. If necessary, gripping the slug in supported or forced the rollers by pressing with the hollow block inserter become. All rollers should preferably be in the starting position by the same amount be open and at the same time after triggering a signal or command End position to be closed.
- Another possibility is to reduce the stretch in the circumferential direction in reducing the feed angle of the rolls when rolling or otherwise expressed, the rolling with a smaller feed angle, as it is to avoid triangulation is practiced at the back end of the head.
- the inclination of the roller axes, the feed angle of the Rolling reduced to 0 ° to 5 °, preferably to 3 ° to 4 °.
- Dome pole with a conical or cylindrical front end with rounded or angled transition is positioned so that the Wall thickness reduction is reduced.
- the rolling then takes place with a initial wall thickness reduction of about 0.5 to 3 mm, which also causes the Widening of the front tube end is reduced.
- a device for performing the method is characterized in that at least one of the rolls, preferably all rolls of the wood mill, with hydraulic quick release or quick closing devices are provided with which the rollers can also be adjusted radially to the rolling stock in a short time against the rolling force are, the closing path of each movable roller at most the respective Shoulder height or the maximum wall thickness reduction.
- the device according to the invention must be able to roll in to reduce the distance between the rolls for a short time, from partially open to the closed state (in the working position).
- the closing path should preferably be used be infinitely variable or in small increments of preferably 0.5 to 1 mm. This can e.g. through a stroke limitation, such as the addition of spacers, respectively.
- the closing process must be triggered automatically by a signal or how it Invention provides can be initiated by an automatic control.
- a signal for control of the closing process the increase in the armature current in the drive motor below Use of a timer is usable.
- the signal to control the closing process from one to the Transport path of the tube switch switched radiation sensor is removable So can a thermal or radiation sensor (a photo cell) immediately before the inlet of the Hollow block inserted between the rollers or from the outlet side become.
- the time from the detection of the hollow block to the exit from the Forming zone or until the rollers start to close should be calculated approximately, but should be better for each shell dimension can be determined empirically under constant technological conditions.
- the advantages of the present invention can be summarized as follows: Avoiding or reducing the trumpet-shaped expansion of the front
- the end of the bobbin can be bumped into the outlet of the woodlouse mill and avoid behind. This increases the process stability when rolling thin-walled blanks with a diameter to wall thickness ratio D / S 10 ... 50th Roll stands of the downstream one that are usually additionally required Sizing or reducing roller mill for reducing trumpet-shaped widenings are saved. It also tears open the end of the bob (Longitudinal cracking) safely avoided at the head of the cup.
- FIG. 1 is the stationary phase for rolling a tube blank shown.
- A denotes the woodlouse
- B denotes a cylindrical one Dome pole inside the tube; the direction of rolling is given at WR.
- the in Hollow block C introduced in the rolling direction is turned into the die D in the woodlling process rolled out.
- the woodlouse is composed of the inlet part G, the stretching part and the Shoulder E, the smoothing part F and the outlet and rounding part H together.
- X is denotes the outlet-side wall at the front end of the cap.
- FIG. 3 shows the proposal according to the invention for an Assel rolling mill, which includes a roller quick-locking device.
- the same parts are the same designated.
- the outlet-side front end of the bobbin is labeled D1.
- the Rolling takes place as shown in the drawing figure with partially opened rollers, see above that at the front end D1 a head with a thicker wall than that Target wall thickness D ( Figure 1) results.
- the tendency to form trumpets becomes strong Dimensions hindered or restricted by the main driver of the expansion, the Wall reduction, is greatly reduced when rolling on.
- the done Rolling i.e. after the first filling of the forming zone is finished the work rolls as quickly as possible by moving them into their end positions or Desired working position driven. This state is shown in Figure 4. Now that can Should be rolled billet wall D2, the target diameter is set.
- This Procedure can be practiced by opening and closing with a roller or is carried out simultaneously with two or three rollers. This is preferred Closing and opening with all three rollers.
- FIGs 5 and 6 Another possibility for carrying out the method according to the invention is in Figures 5 and 6 shown.
- One of the conical or in the form of a cylindrical heel with a rounded or angled transition trained dome rod B used, which is positioned during rolling ( Figure 5) must be that in the beginning only a wall thickness reduction of approx. 0.5 to 3 mm he follows. This also reduces the expansion; a thicker wall is created on front end of the head.
- FIG. 6 shows, after the rolling and filling of the forming zone, the Dome bar is pushed forward and in the stationary rolling process the target slab wall generated.
- the procedural steps after the Figures 3 and 4 as in Figures 5 and 6 can be those shown in Figure 2 Avoid trumpet-like flared ends, because according to the invention radial deformation of the billet compared to the stationary rolling condition reduced and the section modulus at the head end Hindrance of the tangential material flow is increased.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
Description
- Figur 1
- die Stellung der Asselwalzen in der stationären Phase
- Figur 2
- die trompetenförmige Aufweitung am Rohrluppenende
- Figur 3
- das Anwalzen der Luppe mit teilangestellten Asselwalzen
- Figur 4
- die stationäre Phase nach dem Anwalzen
- Figur 5
- das erfindungsgemäße Anwalzen auf abgesetzter Domstange und
- Figur 6
- die stationäre Phase nach dem Anwalzen gemäß Figur 5
Beispiel 1 | Beispiel 2 | |
SH = Hohlblockwanddicke | 14 mm | 10 mm |
SL = Luppenwanddicke | 7 mm | 4 mm |
ΔS= Wanddickenreduktion | 7 mm | 6 mm |
ΔSan= reduzierte Wanddickenreduktion zum Anwalzen, angenommen 14% von ΔS = 0,14 * 7 | ∼1 mm | ∼3 mm |
ΔDHP = Öffnungsweg je Walze angenommen 0,86 * ΔS = 0,86 * 7 | ∼6 mm | ∼3mm |
SLan = Luppenwanddicke nach vorschlagsgemäßem Anwalzen | ||
SLan = SL + ΔDHP = | 7+6 = 13 mm | 4+3 = 7mm |
SLan = SH - ΔSan = | 14-1 = 13 mm | 10-3 = 7 mm |
Claims (12)
- Verfahren zur Vermeidung oder Verminderung trompetenförmiger Aufweitungen am Rohrende beim Schrägwalzen dünnwandiger Rohre auf einem Asselwalzwerk aus einem Hohlblock (c),
dadurch gekennzeichnet, daß beim Einlauf des vorderen Hohlblockbereiches in das Asselwalzwerk die radiale Umformung der Luppe (D) gegenüber dem stationären Walz-Zustand verkleinert und/oder das Widerstandsmoment des Luppenquerschnitts am Kopfende durch Verringerung des tangentialen Werkstoffflusses erhöht wird. - Verfahren Anspruch 1,
dadurch gekennzeichnet, daß zur Verkleinerung der radialen Umformung der Luppe mindestens eine der Walzen des Asselwalzwerkes während des Anwalzens des Kopfstückes gegenüber dem stationären Zustand mindestens teilweise geöffnet ist und nach dem Füllen der Umformzone schnell geschlossen wird. - Verfahren nach Anspruch 2,
dadurch gekennzeichnet, daß der Betrag der Vergrößerung des Walzenabstandes DHP gegenüber dem für die jeweilige Luppenabmessung technologisch erforderlichen Walzenabstand so bemessen ist, daß die Wandreduktion beim AnwalzenSan nur 0% - 80%, vorzugsweise 10% - 50% der Soll-Wandreduktion S beträgt, woraus sich ergibt, daß: und wobei die Gesamtreduktion beträgt.
Dabei bedeuten:- San
- reduzierte Wanddickenreduktion beim Anwalzen
-
- DHP/Walze Öffnungsweg der Walze
-
- Soltwandreduktion
- Hs
- Schulterhöhe der Walze
- Verfahren nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, daß zum Anwalzen der Luppe währen des Einlaufens des Kopfstückes in das Asselwalzwerk die Drehzahl der Walzen vorübergehend um 10 - 70%, vorzugsweise um 40 - 60% gegenüber der Nenndrehzahl vermindert wird. - Verfahren nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, daß durch Herabsetzung der Neigung der Walzenachsen der Vorschubwinkel der Walzen auf 0° - 5°, vorzugsweise auf 3° - 4° vermindert wird. - Verfahren nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet, daß eine Domstange mit konisch oder zylindrisch abgesetztem vorderen Ende mit abgerundetem oder winkligem Übergang beim Anwalzen so positioniert wird, daß die Wanddickenreduktion verringert wird und nach dem Anwalzen zur Erzeugung der Sollwanddicke axial verschoben wird. - Vorrichtung zum Schrägwalzen dünnwandiger Rohre mit radial zum Walzgut anstellbaren Walzen (A) und einer axial verschiebbaren Dornstange (B) mit konisch oder zylindrisch abgesetztem vorderen Ende und abgerundeten oder winkligen Übergang zur Durchführung des Verfahrens zur Vermeidung oder Verminderung trompetenförmiger Aufweitungen am Rohrluppenende beim Schrägwalzen von dünnwandigen Rohren auf einem Asselwalzwerk aus einem Hohlblock (c) nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet, daß mindestens eine der Walzen (A) des Asselwalzwerkes mit hydraulischen Schnelllüft- bzw. Schnellschließeinrichtungen versehen sind, mit denen die Walzen (A) in kurzer Zeit auch gegen die Walzkraft radial zum Walzgut anstellbar sind, wobei der Schließweg jeder verschiebbaren Walze (A) maximal der jeweiligen Schulterhöhe oder der maximalen Wanddickenreduktion entspricht. - Vorrichtung nach Anspruch 7
dadurch gekennzeichnet, daß der Schließweg der Walzen (A) stufenlos oder in kleinen Stufen von vorzugsweise von 0,5 bis 1mm veränderbar ist. - Vorrichtung nach einem der Ansprüche 7 und 8
dadurch gekennzeichnet, daß der Schließvorgang der Walzen (A) von einer automatischen Steuerung einleitbar ist. - Vorrichtung nach einem der Ansprüche 7 bis 9
dadurch gekennzeichnet, daß als Signal zur Steuerung des Schließvorganges der Anstieg des Ankerstromes im Antriebsmotor unter Verwendung eines Zeitschalters einsetzbar ist. - Vorrichtung nach einem der Ansprüche 7 bis 9
dadurch gekennzeichnet, daß das Signal zur Steuerung des Schließvorganges von einem in den Transportweg der Rohrluppe (D) geschalteten Strahlungssensor abnehmbar ist. - Vorrichtung nach Anspruch 7,
dadurch gekennzeichnet, dass alle Walzen (A) des Asselwatzwerkes mit hydraulischen Schnelllüft-bzw. Schnellschließeinrichtungen versehen sind.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19724233A DE19724233C2 (de) | 1997-06-03 | 1997-06-03 | Verfahren zur Vermeidung oder Verminderung trompetenförmiger Aufweitungen am Rohrende beim Schrägwalzen von dünnwandigen Rohren und Vorrichtung zur Durchführung des Verfahrens |
DE19724233 | 1997-06-03 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0882526A2 EP0882526A2 (de) | 1998-12-09 |
EP0882526A3 EP0882526A3 (de) | 2002-02-06 |
EP0882526B1 true EP0882526B1 (de) | 2003-10-01 |
Family
ID=7831905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98250181A Expired - Lifetime EP0882526B1 (de) | 1997-06-03 | 1998-05-26 | Verfahren und Vorrichtung zur Vermeidung oder Verminderung trompetenförmiger Aufweitungen am Rohrende beim Schrägwalzen von dünnwandigen Rohren |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0882526B1 (de) |
AT (1) | ATE250990T1 (de) |
DE (2) | DE19724233C2 (de) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE184496T1 (de) | 1993-07-01 | 1999-10-15 | Schneider Europ Gmbh | Arzneigeräte für die behandlung von blutgefässen mittels ionisierungsbestrahlung |
EP0686342B1 (de) | 1994-06-10 | 1998-09-09 | Schneider (Europe) GmbH | Arzneigerät für die Behandlung eines Teiles von Körpergefäss mittels Ionisierungsbestrahlung |
DE69426071T2 (de) | 1994-06-24 | 2001-05-10 | Schneider Europ Gmbh Buelach | Arzneigerät für die Behandlung eines Teiles eines Körpergefässes mittels Ionisierungsbestrahlung |
US5855546A (en) | 1996-02-29 | 1999-01-05 | Sci-Med Life Systems | Perfusion balloon and radioactive wire delivery system |
US6234951B1 (en) | 1996-02-29 | 2001-05-22 | Scimed Life Systems, Inc. | Intravascular radiation delivery system |
US6676590B1 (en) | 1997-03-06 | 2004-01-13 | Scimed Life Systems, Inc. | Catheter system having tubular radiation source |
US6019718A (en) | 1997-05-30 | 2000-02-01 | Scimed Life Systems, Inc. | Apparatus for intravascular radioactive treatment |
US6413203B1 (en) | 1998-09-16 | 2002-07-02 | Scimed Life Systems, Inc. | Method and apparatus for positioning radioactive fluids within a body lumen |
DE19858955C2 (de) * | 1998-12-10 | 2000-09-28 | Sms Demag Ag | Verfahren zur Verminderung trompetenförmiger Aufweitungen am vorderen Rohrende |
US6352501B1 (en) | 1999-09-23 | 2002-03-05 | Scimed Life Systems, Inc. | Adjustable radiation source |
US6398709B1 (en) | 1999-10-19 | 2002-06-04 | Scimed Life Systems, Inc. | Elongated member for intravascular delivery of radiation |
US6416457B1 (en) | 2000-03-09 | 2002-07-09 | Scimed Life Systems, Inc. | System and method for intravascular ionizing tandem radiation therapy |
DE10334011B3 (de) * | 2003-07-25 | 2004-08-12 | Sms Meer Gmbh | Walzwerk zur Herstellung eines nahtlosen Rohres |
DE10338110A1 (de) * | 2003-08-15 | 2005-03-10 | Biomet Deutschland Gmbh | Mit Chitosan beschichteter metallischer Gegenstand sowie Verfahren zu dessen Herstellung |
DE102022004111A1 (de) | 2022-11-03 | 2024-05-08 | Zhozef Rotenberg | Verfahren zum Schrägwalzen von Rohlingen mit der im Walzkaliber wirkenden axialen Zugkraft |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1939778A1 (de) * | 1969-08-05 | 1971-02-18 | Deutsche Edelstahlwerke Ag | Vorrichtung an Schulterwalzwerken zum Streckwalzen von Rohren |
DE2219941C3 (de) * | 1972-04-20 | 1975-05-15 | Mannesmann-Meer Ag, 4050 Moenchengladbach | Dreiwalzen - Schrägwalzwerk zur Herstellung von Rohren, vorzugsweise zur Herstellung von dünnwandigen Rohren mit verdickten Enden |
DE3622678A1 (de) * | 1985-07-12 | 1987-01-15 | Kocks Technik | Verfahren und vorrichtung zum querwalzen nahtloser rohrluppen |
DE4428530C5 (de) * | 1994-08-12 | 2005-11-10 | Kocks Technik Gmbh & Co. Kg | Verfahren und Walzgerüst zum Schrägwalzen von Rohren |
-
1997
- 1997-06-03 DE DE19724233A patent/DE19724233C2/de not_active Expired - Fee Related
-
1998
- 1998-05-26 AT AT98250181T patent/ATE250990T1/de not_active IP Right Cessation
- 1998-05-26 EP EP98250181A patent/EP0882526B1/de not_active Expired - Lifetime
- 1998-05-26 DE DE59809767T patent/DE59809767D1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE59809767D1 (de) | 2003-11-06 |
ATE250990T1 (de) | 2003-10-15 |
EP0882526A2 (de) | 1998-12-09 |
DE19724233A1 (de) | 1998-12-10 |
EP0882526A3 (de) | 2002-02-06 |
DE19724233C2 (de) | 2003-10-16 |
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