Abstract:
The invention relates to a method for producing a coated steel strip for producing tailored blanks suitable for thermomechanical shaping. According to the invention, the method comprises the following steps: €¢ providing a hot-rolled steel strip; €¢ coating the strip with a metallic coating; €¢ cold rolling the strip such that the strip obtains a variable thickness in its length direction, having at least thicker sections and thinner sections. The invention also relates to a steel strip thus produced and the use of such a steel strip.
Abstract:
The invention relates to a method for producing a metal strip (1), in which the strip (1) is rolled in a multi-stand rolling mill, is removed behind the final rolling stand (2) of the rolling mill in the direction of conveyance (F), and is cooled in a cooling device (3). In order to achieve a favourable grain structure and a high degree of surface evenness, the strip or metal sheet (1) is subjected to additional rapid cooling (4) immediately after passing the working rollers of the final rolling stand (2), wherein the strip or the metal sheet (1) is cooled at least partially within the extent of the final rolling stand (2) in the direction of conveyance (F), wherein rapid cooling is performed by applying a coolant to the strip or metal sheet (1) from above and from below, wherein the volume flow of coolant that is applied to the strip or metal sheet (1) from below measures at least 120 % of the volume flow of coolant that is applied to the strip or metal sheet (1) from above.
Abstract:
A modular rolling mill comprises a plurality of rolling units (10a,10b,10c) having work rolls (14,16) configured and arranged to progressively reduce the cross sectional area of a product received along a mill pass line (P). Gear units (46a,46b,46c) are mechanically coupled to each rolling unit, with each gear unit in turn being mechanically coupled to a driven line shaft (36) by first bevel gear sets (44). The ratios of the first bevel gear sets progressively increase from the first to the last of the gear units to thereby accommodate a progressively increasing speed of the product being rolled. A second bevel gear set (54) is associated with the last gear unit. The ratio of the second bevel gear set is the same as the ratio of the first level gear set of the penultimate gear unit. The line shaft is selectively coupled to the last gear unit via one or the other of its first and second bevel gear sets.
Abstract:
Eine kontinuierliche Fein- oder Drahtstraße, umfassend hinter einem Zwischenwalzabschnitt der Straße angeordnete Zwischenblöcke (ZB I, ZB II) und Maßfertigblöcke (MFB), vor und zwischen, sowie hinter diesen angeordnete Kühlstrecken (KS, KS 1, KS 2, KS 3, KS 4, KS 5, KS 6 ) und Temperaturausgleichstrecken sowie eine diesen nachgeordnete Walzgutsammeleinrichtung, bei der eine Mehrzahl von, im wesentlichen parallel verlaufender Führungslinien (FL 1, FL II, FL, III) über Zwischenweichen (ZW 1, ZW 2, ZW 3, ZW 4, ZW 5) und Umführungen (UF 1, UF 2, UF 3, UF 4) miteinander verbunden, das Führen des aus dem Zwischenabschnitt der Walzenstraße kommenden Walzgutstrangs (WS) durch vorbestimmte Abschnitte der Führungsstrecken (FL I, FL II, FL III) und die , in diesen angeordneten Walz-, Kühl- und Temperaturausgleichseinrichtungen ermöglichen und es damit erlauben, einen guten Temperaturausgleich zwischen Kern und Oberfläche des Walzgutes herbeizuführen und den Walzgutstrang mit einer niedrigen, ausgeglichenen Walzguttemperatur fertig zu walzen.
Abstract:
A method and apparatus for continuously hot rolling ferrous long products which employs a "post finishing" block of roll stands downstream from the finishing stands of the mill. Water boxes or other like cooling devices are preferably interposed between the last mill finishing stand and the postfinishing block. The post finishing block includes at least two reduction stands followed by at least two sizing stands. The reduction stands have an oval-round pass sequence, and the sizing stands have a round-round pass sequence. Clutches or other equivalent means are employed in the drive train to permit changes to be made between the interstand drive speed ratios of at least the reduction stands, and also between some or all of the remaining sizing stands. A fixed rolling schedule is provided for all roll stands in advance of the finishing stands. Thus, the finishing group is supplied with a first process section having a substantially constant cross sectional area and configuration. The first process section is passed through the finishing group and rolling occurs in either none, some, or all of the finishing roll stands, depending on the size of the desired end product. The product then continues through water cooling boxes to the post finishing block as a second process section. The interstand drive speed ratios of the roll stands in the post finishing block are appropriately adjusted to accommodate rolling of the second process section. The total reductions affected in the initial reduction stands of the post finishing block are well above 14%, thereby producing an increased energy level in the product sufficient to create a substantially uniform distribution of fine grains. Typically, such total initial reductions will be on the order of about 20-50%. Significantly lighter reductions on the order of 2-15% are taken in the final round-round pass sequences of the post finishing block to obtain the desired close sizing tolerances in the finished product. The time interval between the higher reduction affected in the oval-round pass sequence and the lighter reductions affected during sizing in the round-round pass sequence is such that the resulting grain size throughout the product cross section will not vary by more than 2, and in most cases by less than 1 ASTM grain size number.
Abstract:
Ein Kompaktwalzwerk zum Walzen von Formstahl auf in mehreren Walzlinien (HWL, WL II, WL III) angeordneten Walzgerüsten, wie Universalwalzgerüsten (U 1, U 2) und Duowalzgerüsten (E 1, E 2, DW 1, DW 2, DW 3). In den Walzlinien HWL, WL II, WL III) sind Längsfördereinrichtungen und zwischen diesen Querfördereinrichtungen für das Walzgut vorgesehen, die dieses entlang einer Walzlinie bzw. von einer Walzlinie auf die andere transportieren. Mindestens zwei Universalwalzgerüste (U 1 und U 2) sind zusammen mit einem Duo-Stauchgerüst (E 1) zu einer Universal-Tandem-Kompaktgerüstgruppe zusammengefaßt. Diese Kompaktgerüstgruppe (U 1, U 2, E 1) und weitere Universalgerüste sowie Duo-Walzgerüste (DW 1, DW 2, DW 3) können durch Verschieben oder Versetzen aus einer Walzposition in vorbereitete andere Walzpositionen, die sich in der gleichen oder in einer anderen Walzlinie der Walzlinien (HWL, WL II, WL III) befinden verschoben oder versetzt werden, sie sind dabei in diesen Walzpositionen quer über die anderen Walzlinien hinweg unmittelbar mit den an den äußeren Walzlinien (HWL) angeordneten Antriebsaggregaten (A 1, A 2, A 3) kuppelbar oder auch mittelbar über eines oder mehrere in den anderen Walzlinien angeordneten Walzgerüsten.