Patent DE-102010034399-A1 (DE)
Title: Steel-continuous casting of large round- or square-cross sections, comprises oscillating vertical mold and subsequent secondary cooling and/or strand guide in form of arc-shaped or oval arch system consisting of segments
Inventor: FIGGE DIETER
IPC: B22D11/06
Filed: 2010-08-14
Abstract: The method comprises oscillating vertical mold and subsequent secondary cooling and/or strand guide in form of an arc-shaped or oval arch system consisting of segments with roller guidance system and water cooling for the strand. A cantilever-housing per sampling point is used in an universal-system for fast program change to the strand guide in the segment (3). The cantilever-housing per segment is 3-4 sampling point and in addition to altogether of 6-10 lower roller (2) with the cantilever-housing. The method comprises oscillating vertical mold and subsequent secondary cooling and/or strand guide in form of an arc-shaped or oval arch system consisting of segments with roller guidance system and water cooling for the strand. A cantilever-housing per sampling point is used in an universal-system for fast program change to the strand guide in the segment (3). The cantilever-housing per segment is 3-4 sampling point and in addition to altogether of 6-10 lower roller (2) with the cantilever-housing, where: each two housings is used for the lower roller with mutually inclined axle center for a strand-side guide and one housing for an upper roller (1) for a vertical guidance; the housing for the lower roller has a horizontal adjustment possibility to adapt a casting format; and the housing for the upper roller has a vertical adjustment to adapt the casting format. A support angle changes form 90-115[deg] during a format change. The housing has an eccentric bush. The axle center of a lower roller housing and its adjustability is defined by a large and a small cross-section, where: a large circular diameter of 178% is higher than a small circular diameter; and an intermediate cross-sections are freely selectable such that large eccentricity contains a correction possibility over the roll diameter by an execution of the housing with the eccentric bush. A shaft axis of the cantilever-housing parallely passes to a guide surface. Each single drive is provided without drive shafts with multi-stage planetary gear and drive motor for the cantilever-housing with a rotary drive. The non complete segment is exchanged to a support role change so that the roller replacement is replaced by a turned-off support roller. The housing always remains in a system. The segments in the system are pivotable over a pivot point for two positions to a facilitation of a replacement work at the cantilever-housing, where each single of the different segments is pivoted for the replacement work to the roll change independent from one another by a hydraulic cylinder into a horizontal change position so that the cantilever-housing are accessible for changing the support roller. Each segment is pivoted/clamped again into its operating position after carrying out the roll change-drive. Machine movements are controlled by a computer numerical control-controller. The support roller in the cantilever-housing of the lower roller in rotatable eccentric bush is mounted with large eccentricity for adjusting the respective support roller diameter and to correct the roll diameter with the intermediate cross-sections so that a strand center remains constant. The lower support roller has a cone-shaped disk at the round strand of a mold. The strand supports in the angle of 90-115[deg] . The upper roller has a smooth cylindrical shape having a recess in a middle outside area. The housing of the upper roller of the eccentric bush is obtained for a compensation of a lateral displacement at the lower roller due to distortion rotation so that a supporting force acts on the upper- and lower-rollers without lateral displacement in a plane. The lower support roller has a collar during square strands with which the side guide of the strand takes place. A support role profile remains same during the format change in which the radius of the large round is selected than the radius for the support role profile. The support roller receives an inner water cooling, where the cooling water is supplied through a rotary feedthrough by a central hole in the shaft of the cantilever-housing and freely leaves outside of the support rollers, which are clamped on a housing shaft with a conical connection. An axial clamping force is manually or hydraulically applied. The segments have same radius and same arrangement of the lower- and upper-rollers. The different housings with different maximum supporting force and different diameters are used in the segments such that the support rollers except the central hole over two further holes for gripping the support disks over two mandrels, where a layer and diameter of the hole are identical with the support rollers. The change of the support roller is performed either manually with crane support or by a manipulator so that heavy manual work is avoided, and a short change time is reached, where the same manipulator is successively used at the respective segments. A support roller bearing used in the cantilever-housings is designed with its spherical roller bearings or carb roller bearings with permanent grease lubrication for a lifetime of 5-6 years so that the replacement is excluded due to bearing damage. The bearings are very carefully sealed against water intrusion. The manipulator used for changing the support roller is a machine controlled with 5 axes: longitudinal movement on the guide in the segment; vertical movement of carriage; swiveling movement of the guide part for a beam; horizontal movement of the beam; and rotational movement of a head with two mandrels. The mutually inclined guide strands of the lower roller housing forms an obtuse triangle, where: the obtuse angle is 158-162[deg] ; a triangle lies so that the obtuse angle is turned towards the strand; and the support roller diameter is 250-500 mm. Two housings are arranged for the lower roller on the two guide strands inclined at 120[deg] to each other. The shaft axis of the support roller of the cantilever-housing vertically passes to the guide track. The rotary drive is performed as a single drive but with different arrangement of gears. A single manipulator is used for the roller change. The guide is used in longitudinal guides (21) to the left/right of the strand so that the manipulator initially changes the support roller of all left housing and then transferring the segment to the manipulator of the support roller of all right housing.