摘要:
A flow of rolling with a combination of asymmetric rolling (S1) and skin pass rolling (S3) is shown. Differential-speed rolling is performed as the asymmetric rolling, and a winder temporarily winds a metal strip with a collapsed plate shape by traverse winding (loose winding which allows the metal strip is wound in a zigzag manner: S2). Then, the skin pass rolling is performed, and orderly winding is performed in a coil form (S4). As shown in the flow of rolling, tandem rolling may be performed by arranging two or more rolling mills side by side so that the asymmetric rolling and the skin pass rolling are continuously performed without the traverse winding (S2) in the mid course.
摘要:
Die Erfindung betrifft ein Verfahren zum Walzen eines Drahts (1) auf einer Drahtstraße (2), die mindestens eine Walzstraße (3), mindestens einen der Walzstraße (3) nachgeschalteten Drahtwalzblock (4) und mindestens einen dem Drahtwalzblock (4) nachgeschalteten Maßwalzblock (5) aufweist, wobei der Draht (1) in dem Maßwalzblock (5) auf sein Endmaß gewalzt wird und wobei die Walzstraße (3), der Drahtwalzblock (4) und der Maßwalzblock (5) jeweils mindestens zwei Walzgerüste (6, 7, 8) aufweisen. Um den apparativen Aufbau der Drahtwalzstraße zu vereinfachen, ist erfindungsgemäß vorgesehen, dass der Draht (1) im Maßwalzblock (5) gewalzt wird, wobei mindestens drei Walzgerüste (8a, 8b, 8c, 8d) des Maßwalzblocks (5) relativ zueinander ein festes Verhältnis der Walzspalte (s) aufrecht erhalten, und dass die Walzspalte (s) der Walzgerüste (6, 7) in der Walzstraße (3) und/oder in dem Drahtwalzblock (4) so eingestellt werden, dass der Draht (1) unmittelbar vor (9) dem Maßwalzblock (5) einen vorgegebenen Durchmesser (d) aufweist. Des weiteren betrifft die Erfindung eine Drahtstraße, insbesondere zur Durchführung dieses Verfahrens.
摘要:
A duplex cold rolling line (1) includes a feeding unit (2), a first rolling unit (3), a furnace and descalingunit (4), apicklingunit (5), a second rolling unit (7) and an exit unit (8). The feeding unit (2) is adapted to unroll a hot-rolled coil to form an unrolled steel strip. The first rolling unit (3) includes at least two juxtaposed first rolling machines (31) adapted to perform a first-pass rolling operation on the unrolled steel strip. The furnace and descaling unit (4) is adapted to perform an annealing and descaling operation on the unrolled steel strip after completion of the first-pass rolling operation. The pickling unit (5) is adapted to perform a pickling operation on the unrolled steel strip after completion of the annealing and descaling operation. The second rolling unit (7) includes five juxtaposed second rolling machines (71) adapted to perform a second-pass rolling operation on the unrolled steel strip. The exit unit (8) is adapted to roll the unrolled steel strip to form a cold-rolled coil.
摘要:
An apparatus and method for rolling aluminum sheet uses a texture roll to roll the sheet while is it hot and has reduced yield strength. The texture rolling may be used to remediate defects in the sheet at a variety of stages in rolling, and may facilitate subsequent rolling stages.
摘要:
The invention relates to a method and a rolling stand (100) for cold rolling rolled stock. The rolling stand (100) comprises at least one upper and one lower backup roll (110-1, 110-2) and also an upper and a lower work roll (120-1, 120-2), which define a roll gap (128). Optionally, a lower and an upper intermediate roll (130-1, 130-2) may also be provided between the work rolls and the backup rolls. In order to ensure an absolutely equal circumferential speed of the upper and lower work rolls when cold rolling in skin-pass mode, it is proposed according to the invention to decouple the upper or lower work roll from its associated drive device.
摘要:
Rolling method for the production of flat products, such as metal strip, which provides a production step of a thin slab with a thickness comprised between 30 and 90 mm, preferably between 35 and 70 mm, a temperature maintenance and/or possible heating step of the slab to be sent for rolling, and a rolling step with multiple passes performed in a reversing rolling mill (14) comprising at least a reversing rolling stand ( 15), in which at least a winding reel furnace (16a) is also present upstream of the stand (15) and a winding reel furnace (16b) downstream of the stand (15), a winding step also being provided downstream of the rolling in at least a coiler (19a, 19b) to form a relative coil of strip of a defined weight, comprised between 20 and 30 tons, and a cooling step of the strip being provided between the reversing rolling mill (14) and said at least one coiler (19a, 19b). The method provides that the thin slab is disposed, for example, sheared to size, upstream of the maintenance and/or possible heating step in order to form a segment of slab having a length equivalent, in weight, greater than that of a coil, and that, already after the first rolling pass in the reversing rolling mill (14), the thickness of the segment of slab is reduced to a value in the range of 20-25 mm so as to render it windable on the reel furnace (16b) downstream of the stand (15).
摘要:
In cold rolling of a seamless metallic tube with a cold pilger mill, when a reduction ratio of an outside diameter becomes excessive in comparison to a reduction ratio of a wall thickness, strain in a circumferential direction on flange regions becomes excessive. As a result, compressive stress in a circumferential direction becomes excessive, so that wrinkle imperfections are generated inside a tube and folded on groove bottom regions to become folded defects. This process is repeated to be developed into inside defects. When a hollow shell is produced by the Mannesmann-mandrel process instead of the extrusion process, inside wrinkle imperfections are generated with a sizing mill (a stretch reducer or a sizer) at a stage of hollow shell. Since the inside wrinkle imperfections further grow in cold rolling, it is necessary to pay attention thereto. In consideration of these, (a reduction ratio of an outside diameter/a reduction ratio of a wall thickness both in a cold pilger mill) is set to not more than 1/2. It is, thereby, possible to obtain a high-quality seamless metallic tube, inside defects thereof being suppressed, produced by cold rolling.