EP0476793B1 - Laminoir pour étendre des corps creux sur un mandrin - Google Patents
Laminoir pour étendre des corps creux sur un mandrin Download PDFInfo
- Publication number
- EP0476793B1 EP0476793B1 EP91250236A EP91250236A EP0476793B1 EP 0476793 B1 EP0476793 B1 EP 0476793B1 EP 91250236 A EP91250236 A EP 91250236A EP 91250236 A EP91250236 A EP 91250236A EP 0476793 B1 EP0476793 B1 EP 0476793B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stand
- rolling
- rollers
- driven
- driven rollers
- 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 description 58
- 239000011324 bead Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000009785 tube rolling Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 238000012546 transfer 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
- 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
- B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
- B21B17/04—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a continuous process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/08—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process
- B21B13/12—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process axes being arranged in different planes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
- B21B35/10—Driving arrangements for rolls which have only a low-power drive; Driving arrangements for rolls which receive power from the shaft of another roll
Definitions
- the invention relates to a rolling mill for stretching hollow bodies on a mandrel.
- Seamless steel tubes are usually manufactured in three forming stages, punching in a cross-rolling mill, stretching in a main stretching stage and finish rolling in a sizing or stretch-reducing mill. Many processes have proven to be the main stretching stage, such as e.g. B. plug rolling and vocational rolling. In recent years, continuous rolling on a rolling rod has become particularly important.
- the rolling stock is formed in a row of five to eight consecutive rolling stands either using a freely moving or a guided mandrel.
- the roll stands are usually duo stands, the roll gaps of which are offset from one another by 90 degrees, in order to achieve the most uniform possible deformation of the wall thickness through this mutual arrangement.
- the number of roll stands is determined by the required stretching in the main stretching stage and the training given the roll calibration, the roll calibration itself in turn on the number of rolls per roll stand.
- this play is first pushed away in the caliber base before the hollow block wall itself is reduced. This ovalizes the hollow block because the wall bulges in the direction of the caliber flanks, i.e. the roll gap.
- the directly pressed surface in the caliber base is stretched.
- the hollow block wall in the caliber flanks can become thicker or thinner.
- the permissible angle of containment limits the decrease in wall thickness in the base of the caliber and thus the stretching per rolling stand.
- a larger number of rolling stands is required, which is disadvantageous in terms of the high investment and maintenance costs.
- a rolling mill according to claim 1 is proposed. With extremely few stands, preferably with only one main forming roll stand and downstream and, if necessary, upstream plant parts, a very high elongation can be achieved with excellent rolling stock quality, and this with a rolling mill with low investment mass.
- duo stands with three rollers, each offset by 120 degrees.
- Such stands have already worked successfully in dimension and stretch reduction rolling mills for pipes with small to medium dimensions. Due to the geometrical conditions, however, it is not possible to absorb such high rolling forces or to transmit high drive torques with such stands as they occur during tube rolling via a mandrel bar.
- the known sizing or stretch-reducing rolling mills are therefore those which carry out hollow rolling without an internal tool, that is to say with lower rolling forces.
- the three-roll stands cannot suggest the use of main forming stands with a universal roll arrangement.
- Roll stands of this type are known per se for rolling profiles, in particular wide-flange supports. Because of the different rolling technology used for rolling solid materials, it is not easy to transfer these rolling stands to tube rolling mills with mandrels.
- the diameter of the driven rollers be larger than that of the non-driven rollers. With this proposal, the gripping conditions of the rolling stock between the driven rolls can be improved.
- each of the driven rollers covers a segment of more than 90 degrees of the rolling stock circumference. Accordingly, the non-driven rollers enclose the rolling stock at an angle ⁇ 90 degrees.
- the relatively small beads in the caliber flanks that occur with this rolling arrangement are accommodated by a corresponding expansion of the caliber. The beads can be removed in a subsequent roll stand with two driven rolls, the wrap angle of which is in turn greater than 90 degrees.
- the axes of the non-driven rolls lie behind the plane in the rolling direction which runs through the axes of the driven rolls. Due to the principle of the driven roller pair, the latter are loaded by additional driving forces which are required to drive the rolling stock through the non-driven rollers. Especially with large wall thickness reductions, the starting impact occurs too early, ie when the gripping conditions of the driven roll stand are not yet fully effective. The starting shock can be delayed by moving the axes of the non-driven roller in the rolling direction behind the axes of the driven rollers, as suggested above.
- the axes of the driven rollers of the duo finishing stand arranged downstream of the main forming roll stand are arranged at 90 degrees to the axes of the driven rollers of the main forming stand and that the segment of the rolling stock processed by the rollers of the duo finishing stand is larger, than the rolling stock circumference machined by each non-driven roll of the main forming stand.
- the driving stand which is arranged upstream of the main stand, is a device for deforming the hollow block in at least one longitudinal center plane, which runs offset to the longitudinal middle plane running through the caliber base of the driven rollers of the main deformation stand.
- the invention surprisingly creates a rolling mill for stretching hollow bodies on a mandrel, that is to say a rolling mill with very high stretching, which can do without the large number of continuous rolling stands arranged one after the other and nevertheless achieves the objective set out in accordance with the invention with a system requiring low investment.
- FIG. 1 denotes the main deformation stand, which is built in a universal roller arrangement.
- a horizontal-vertical arrangement is selected; however, it is also conceivable to build the rollers inclined at 45 degrees in a known manner.
- the horizontal rolls are designated 2 and 3, the vertical rolls have the item numbers 4 and 5.
- the main deformation stand is arranged on a base plate 11 on which the duo finishing stand 6 on the outlet side is also arranged. In a known design, this is equipped with rollers 14 which are driven by the drive motor 15 above the roll stand 6.
- a drive frame 12 is arranged on the base plate 11, which is equipped with rollers 13 driven by the drive motor 15 '. These rollers 13 are calibrated so that they deform the hollow block, which is denoted by 7, in the longitudinal median plane, through the horizontal the caliber base of the rollers 13 runs.
- the hollow block is rolled onto the rod 8 and slightly oval shaped.
- the arrangement of the rollers of the main deformation stand is shown schematically in FIG.
- the horizontal rollers 2 and 3 can be seen to be driven via the spindles 9, which are coupled to the pins of the rollers 2 and 3 at 10.
- the vertical rollers 4 and 5 run freely, i. H. they are not driven.
- the driven rollers 2 and 3 encompass a segment of the tube of more than 90 degrees, while the non-driven rollers 4 and 5 enclose a smaller segment.
- Corresponding expansions can be provided in the caliber flanks to accommodate relatively small beads, as is the state of the art.
- the driven rollers 2 and 3 have the task of gripping the rolling stock and driving it through the non-driven rollers, particularly good gripping conditions must be created.
- the initial impact occurs too early, ie when the gripping conditions of the driven roll stand are not yet fully effective.
- the vertical rollers 4 and 5 are moved in the rolling direction by the amount x, that is, behind the plane of the axes of the driven rollers.
- the proposed rolling mill it is possible to achieve a large decrease in wall thickness with the same wall thickness with a few, preferably only one main forming stand, in order to achieve a salable pipe with the least construction effort.
- a driving stand can, but does not have to, improve the insertion process into the main forming roll stand.
- the small residual beads on the roll gaps between the driven and non-driven rolls that occur in the proposed rolling mill are accommodated in this area by a corresponding design of the roll gap. These beads are removed in the subsequent finish stitch in the duo finishing stand with an overlap area of the rollers 14 that is substantially over 90 degrees of the circumference.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
Claims (3)
- Laminoir pour étirer des corps creux sur un mandrin, comportant au moins une cage de déformation principale (1) dans un agencement de laminage universel, comportant des cylindres réglables (2,3), ainsi qu'une cage duo finisseuse (6) agencée en aval de la cage de déformation principale (1) et le cas échéant une cage d'entraînement (12) agencée en amont de la cage de déformation principale, deux cylindres opposés (2,3) de la cage de déformation principale (1) pouvant être entraînés, et le diamètre des cylindres entraînés (2,3) étant plus grand que celui des cylindres non entraînés (4,5), et chacun des cylindres entraînés (2,3) recouvrant un segment de plus de 90° de la périphérie du produit de laminage, et les axes des cylindres non entraînés (4,5) étant situés dans le sens de laminage en aval du plan s étendant à travers les axes des cylindres entraînés (2,3).
- Laminoir selon la revendication 1,
caractérisé en ce que les axes des cylindres entraînés (14) de la cage duo finisseuse (6) agencée en aval de la cage de déformation principale sont agencés à 90° par rapport aux axes des cylindres entraînés (2,3) de la cage de déformation principale (1), et le segment de la périphérie du produit de laminage traitée par les cylindres (14) de la cage duo finisseuse (6) est plus grand que la pièce périphérique du produit de laminage traitée par chaque cylindre non entraîné (4,5) de la cage de déformation principale (1). - Laminoir selon la revendication 1,
caractérisé en ce que la cage d'entraînement (12) est un dispositif pour former le lingot creux (7) dans au moins un plan central longitudinal s'étendant de façon décalée par rapport au plan central longitudinal s'étendant à travers le fond de calibrage des cylindres entraînés (2,3) de la cage de déformation principale (1).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4030046 | 1990-09-19 | ||
DE4030046 | 1990-09-19 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0476793A2 EP0476793A2 (fr) | 1992-03-25 |
EP0476793A3 EP0476793A3 (en) | 1992-05-27 |
EP0476793B1 true EP0476793B1 (fr) | 1995-04-19 |
Family
ID=6414763
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91250236A Expired - Lifetime EP0476793B1 (fr) | 1990-09-19 | 1991-08-27 | Laminoir pour étendre des corps creux sur un mandrin |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0476793B1 (fr) |
JP (1) | JPH04231105A (fr) |
CZ (1) | CZ281022B6 (fr) |
DE (1) | DE59105240D1 (fr) |
RU (1) | RU2048936C1 (fr) |
SK (1) | SK278793B6 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2614974C1 (ru) * | 2015-10-01 | 2017-03-31 | Открытое акционерное общество "Российский научно-исследовательский институт трубной промышленности" (ОАО "РосНИТИ") | Способ непрерывной прокатки и непрерывный многоклетьевой стан для его осуществления |
CN112570448B (zh) * | 2020-11-27 | 2023-04-14 | 中北大学 | 一种大型带内筋带导轨的矩形型材制造设备 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2041937A (en) * | 1934-10-27 | 1936-05-26 | Alfina Immobilien Finanzierung | Tube rolling process |
DE1427915B2 (de) * | 1962-11-29 | 1973-01-11 | Fa. Friedrich Kocks, 4000 Düsseldorf | Walzwerk zum herstellen nahtloser rohre |
US3593553A (en) * | 1968-07-12 | 1971-07-20 | Blaw Knox Co | Method and apparatus for rolling tubes |
DE3914016C1 (fr) * | 1989-04-25 | 1990-07-26 | Mannesmann Ag, 4000 Duesseldorf, De |
-
1991
- 1991-08-27 DE DE59105240T patent/DE59105240D1/de not_active Expired - Fee Related
- 1991-08-27 EP EP91250236A patent/EP0476793B1/fr not_active Expired - Lifetime
- 1991-09-18 RU SU915001476A patent/RU2048936C1/ru active
- 1991-09-18 JP JP3267016A patent/JPH04231105A/ja active Pending
- 1991-09-19 CZ CS912861A patent/CZ281022B6/cs not_active IP Right Cessation
- 1991-09-19 SK SK2861-91A patent/SK278793B6/sk unknown
Also Published As
Publication number | Publication date |
---|---|
RU2048936C1 (ru) | 1995-11-27 |
SK286191A3 (en) | 1996-04-03 |
SK278793B6 (sk) | 1998-03-04 |
CZ286191A3 (en) | 1993-02-17 |
DE59105240D1 (de) | 1995-05-24 |
JPH04231105A (ja) | 1992-08-20 |
EP0476793A2 (fr) | 1992-03-25 |
EP0476793A3 (en) | 1992-05-27 |
CZ281022B6 (cs) | 1996-05-15 |
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