EP1008400A2 - Verfahren zur Verminderung trompetenförmiger Aufweitungen am vorderen Rohrende - Google Patents
Verfahren zur Verminderung trompetenförmiger Aufweitungen am vorderen Rohrende Download PDFInfo
- Publication number
- EP1008400A2 EP1008400A2 EP99250417A EP99250417A EP1008400A2 EP 1008400 A2 EP1008400 A2 EP 1008400A2 EP 99250417 A EP99250417 A EP 99250417A EP 99250417 A EP99250417 A EP 99250417A EP 1008400 A2 EP1008400 A2 EP 1008400A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- rolling
- woodlice
- mandrel bar
- pipe
- cone
- 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
Links
- 238000000034 method Methods 0.000 title claims description 10
- 238000005096 rolling process Methods 0.000 claims abstract description 39
- 241000131095 Oniscidea Species 0.000 claims description 22
- 238000009499 grossing Methods 0.000 claims description 11
- 230000000284 resting effect Effects 0.000 claims 1
- 230000007704 transition Effects 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 230000002265 prevention Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 11
- 239000002023 wood Substances 0.000 description 2
- 241000237858 Gastropoda Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011435 rock Substances 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 for reducing trumpet-shaped widenings on front pipe end when diagonally rolling thin-walled pipes on an Assel mill, at which is conically offset at the front end between two cylindrical areas Mandrel bar positioned according to its starting position when entering the front Hollow block area in the Assel mill is moved axially controlled in the rolling direction.
- the invention is based on DE 197 24 233 A1 in which it is proposed when running in of the front hollow block area in the woodlice mill the radial forming of the billet compared to the stationary rolling condition and / or the section modulus of the cross section of the cap at the head end by obstructing the tangential material flow to increase.
- the material speed and the material flow essential when rolling wood in the circumferential direction of the tube in the unsteady state is greater than in the longitudinal direction, promote or increase higher rolling speeds of the Material in the circumferential direction of the slug or in the tangential direction at the stage of Rolling without longitudinal tension, the stretching of the material in the circumferential direction.
- the Material flow that is caused by the radial deformation, i.e. by reducing the wall thickness is therefore preferably in the tangential direction, less in the longitudinal direction (Axial) direction, so that the circumference or diameter of the plate is enlarged. This locally and temporarily process-related diameter enlargement manifests itself at the bowl head as a trumpet-shaped expansion.
- the object of the present invention is to find a method with which the trumpet-shaped expansion of thin-walled slugs at their front end when Rolling in an Assel mill reduced in size to a harmless level can be.
- An essential part of the process is the use of a mandrel bar attached to its free End has a cone and then has a cylindrical piece, the Diameter is smaller than the actual mandrel rod diameter.
- the mandrel bar is in Rolling direction shiftable at controlled speed.
- the hollow block is located at the beginning of the rolling with its front edge in front of the shoulder of the woodlice. If this point is reached, the Mandrel bar advanced at a set speed in the rolling direction. At the same time, the woodlice are moved apart and pivoted so that the The distance between the mutually parallel surface lines remains constant, i.e. the Pipe wall thickness is maintained. When the end of the cone is reached, the woodlice rolls no longer spread apart. Then the woodlice rolls so far pivoted back that now the surface line of the smoothing part parallel to the surface line of the (cylindrical) mandrel bar lies. The distance between the surface lines corresponds to each other continue to the rolled tube wall thickness, thickened ends do not occur.
- the woodlouse rollers are pivoted about their roller centers, whereby the rolling centers lie on a vertical of the longitudinal axis of the roll, which is the smoothing part the rollers cut in the middle.
- the two drawing figures give a rough schematic of the conditions in woodlice rolling a thin-walled tube again. Shown are one of the woodlice 7 and the Mandrel bar 1, which has a cone 2 of e.g. 150 mm long and attached to it then again a cylindrical piece 3 of e.g. 120 mm long. The Diameter 4 of this cylindrical piece is e.g. 15 mm smaller than the real one Mandrel rod diameter 5. The mandrel rod 1 is controlled in the rolling direction 6 Slidable speed.
- the hollow block 14 is located with its front edge 15 in front of the shoulder 9 of the Asselwalzen 7.
- the mandrel bar 1 with a fixed Speed advanced in the rolling direction.
- the woodlice 7 so moved apart that the distance of the surface lines 10 and 11 from each other constant remains, i.e. the pipe wall thickness is maintained.
- the Asselwalzen 7 no longer moved apart.
- the Asselwalzen 7 pivoted back in the direction of arrow Y (Fig. 2) that now the surface line 10 of the smoothing part is parallel to the surface line 13 of the cylindrical part 3 of the mandrel bar 1.
- the distance between the surface lines 10 and 13 from each other continues to correspond to the rolled Pipe wall thickness.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
- Debarking, Splitting, And Disintegration Of Timber (AREA)
- Metal Rolling (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Electric Cable Installation (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
Abstract
Description
- Fig. 1
- die Stellung der Dornstange bei Walzbeginn und
- Fig. 2
- die Stellung der Dornstange im stationären Betrieb.
Claims (3)
- Verfahren zur Verminderung trompetenförmiger Aufweitungen am vorderen Rohrende beim Schrägwalzen dünnwandiger Rohre auf einem Asselwalzwerk, bei dem die am vorderen Ende zwischen zwei zylindrischen Bereichen konisch abgesetzte in ihrer Ausgangsstellung entsprechend positionierte Dornstange beim Eintreten des vorderen Hohlblockbereiches in das Asselwalzwerk axial gesteuert in Walzrichtung verschoben wird,
dadurch gekennzeichnet,daß die beim Anwalzen des Rohres auf die zu walzende Wanddicke eingestellten Asselwalzen unter Beibehaltung ihres zwischen dem Konus der Dornstange und dem Glätteil jeder Asselwalze gebildeten Walzspaltes zeitgleich mit dem Verschieben der Dornstange und analog zum ansteigenden Verlauf des Konus der Dornstange auseinandergefahren und gleichzeitig so geschwenkt werden, daß der Glätteil der Asselwalze annähernd parallel zum Konus der Dornstange verläuft. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet,daß bei Walzbeginn der Hohlblock mit seiner vorderen Kante vor der Schulter der Asselwalze liegt und die Dornstange so positioniert ist, daß sich ihr konischer Teil in ruhender Stellung zwischen den Asselwalzen und ihr Übergang von dünnen zylindrischen Teil zum konischen Teil unter der Schulter der Asselwalze befindet - Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,daß das Schwenken der Asselwalzen um deren Walzenmittelpunkte erfolgt und daß die Walzmittelpunkte auf einer Senkrechten der Walzenlängsachse liegen, die den Glätteil der Walzen in der Mitte schneidet.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19858955 | 1998-12-10 | ||
DE19858955A DE19858955C2 (de) | 1998-12-10 | 1998-12-10 | Verfahren zur Verminderung trompetenförmiger Aufweitungen am vorderen Rohrende |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1008400A2 true EP1008400A2 (de) | 2000-06-14 |
EP1008400A3 EP1008400A3 (de) | 2003-08-20 |
EP1008400B1 EP1008400B1 (de) | 2005-01-05 |
Family
ID=7891905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99250417A Expired - Lifetime EP1008400B1 (de) | 1998-12-10 | 1999-11-29 | Verfahren zur Verminderung trompetenförmiger Aufweitungen am vorderen Rohrende |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1008400B1 (de) |
AT (1) | ATE286437T1 (de) |
DE (2) | DE19858955C2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019123836A1 (de) * | 2019-09-05 | 2021-03-11 | Sms Group Gmbh | Schrägwalzaggregat sowie Verfahren zum Anstellen des Walzkalibers eines Schrägwalzaggregats |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3020927A1 (de) * | 1980-06-03 | 1981-12-10 | Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover | Schraegwalzwerk zum reduzieren des durchmessers von rohren |
DE3622678A1 (de) * | 1985-07-12 | 1987-01-15 | Kocks Technik | Verfahren und vorrichtung zum querwalzen nahtloser rohrluppen |
DE4428530A1 (de) * | 1994-08-12 | 1996-02-22 | Kocks Technik | Verfahren und Walzgerüst zum Schrägwalzen von Rohren |
EP0882526A2 (de) * | 1997-06-03 | 1998-12-09 | MANNESMANN Aktiengesellschaft | Verfahren und Vorrichtung zur Vermeidung oder Verminderung trompetenförmiger Aufweitungen am Rohrende beim Schrägwalzen von dünnwandigen Rohren |
-
1998
- 1998-12-10 DE DE19858955A patent/DE19858955C2/de not_active Expired - Fee Related
-
1999
- 1999-11-29 EP EP99250417A patent/EP1008400B1/de not_active Expired - Lifetime
- 1999-11-29 DE DE59911403T patent/DE59911403D1/de not_active Expired - Lifetime
- 1999-11-29 AT AT99250417T patent/ATE286437T1/de not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3020927A1 (de) * | 1980-06-03 | 1981-12-10 | Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover | Schraegwalzwerk zum reduzieren des durchmessers von rohren |
DE3622678A1 (de) * | 1985-07-12 | 1987-01-15 | Kocks Technik | Verfahren und vorrichtung zum querwalzen nahtloser rohrluppen |
DE4428530A1 (de) * | 1994-08-12 | 1996-02-22 | Kocks Technik | Verfahren und Walzgerüst zum Schrägwalzen von Rohren |
EP0882526A2 (de) * | 1997-06-03 | 1998-12-09 | MANNESMANN Aktiengesellschaft | Verfahren und Vorrichtung zur Vermeidung oder Verminderung trompetenförmiger Aufweitungen am Rohrende beim Schrägwalzen von dünnwandigen Rohren |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019123836A1 (de) * | 2019-09-05 | 2021-03-11 | Sms Group Gmbh | Schrägwalzaggregat sowie Verfahren zum Anstellen des Walzkalibers eines Schrägwalzaggregats |
Also Published As
Publication number | Publication date |
---|---|
DE19858955A1 (de) | 2000-06-21 |
DE19858955C2 (de) | 2000-09-28 |
DE59911403D1 (de) | 2005-02-10 |
EP1008400A3 (de) | 2003-08-20 |
EP1008400B1 (de) | 2005-01-05 |
ATE286437T1 (de) | 2005-01-15 |
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