Patent DE-102008036435-A1 (DE)
Title: Producing metallic material composites and composite semi-finished products, comprises hot-roll plating a strip made of basic material with a strip of coating material or strips of the coating material using laser- and inductive support
Inventor: BRENNER BERNDT
IPC: B23K20/04
Filed: 2008-08-05
Abstract: The method comprises hot-roll plating a strip made of basic material (1) with a strip of a coating material (2) or strips of the coating material using laser- and inductive support, inhomogeneous short-time heating one of the strips as a result of a simultaneous energy entry by an electromagnetic induction and a laser beam irradiation, where the inductive portion of the total energy entry is 65% and the inductive heating is carried out in a strip running direction before laser beam irradiation, and aligning a laser beam (10) directly on or above a deforming zone of inner sides of the strips. The method comprises hot-roll plating a strip made of basic material (1) with a strip of coating material (2) or strips of coating material by laser- and inductive support, inhomogeneous short-time heating the strips as a result of simultaneous energy entry by electromagnetic induction and laser beam irradiation, aligning laser beam (10) directly on or above a deforming zone of inner sides of the strips or directly above a roller mesh, superimposing laser-induced temperature field (T(L)) with inductively produced temperature fields (T i), so that a temperature gradient at the place of deforming zone prevails vertical to a rolling level and the maximum temperature in a plating level lies below the melting temperature (T(S)) of the strips with lowest melting temperature (T(S)), hot-rolling the strips provided with temperature gradients in a pass, and adjusting a degree of hot-rolling to 1-70%. The inductive portion of the total energy entry is 65% and the inductive heating is carried out in a strip running direction before laser beam irradiation. The laser beam comprises total width of deforming zone with constant intensity and total height of deforming zone. The dimension of relative deformation between the strips, total deformation of the strips by the height and ratio of inductively produced temperatures, height and expansion of the laser-induced temperature field, strip geometry, roller geometry and roller delivery is adjusted for the hot-roll plating. The hot-rolling plating is carried out with rollers, of which one is profiled and through which the hot-rolling at the same time the final shaping of semi-finished products takes place. An intermediate shape of the plated strips is produced with the hot-rolling plating and the rolling of the semi-finished products is carried out in subsequent profiled roller. A radical inductive heating of the strips is carried out for strips made of thermally insensitive materials and inductors (7, 8) completely covers the corresponding strips. A distance between the deformation zone and inductors is selected, so that temperature gradient of the inductive heating in the strip material reduces itself to a large extent. The temperature level for the height of the inductively produced temperature fields and the laser-induced temperature field at the strip inner sides in the deforming zone counts with the (T(S)) than melting temperature of the strips. The inductive heating of the strip inner sides is carried out by flat inductor only for the strips made of the thermally sensitive materials. The inductors are directly arranged above a laser-impact zone. The hot-roll-plated strip (5) is directly and rapidly cooled in a cooling section after leaving the pair of rollers. The strip with basic material G(1), strip with coating material A(2) and strip with other coating material B(3) are used, so that a double-side plated semi-finished products results, and strip with basic material G(1) and strip with coating material A(2) are used, so that a single-side plated semi-finished products results. The heating through the induction and the laser effect, the transportation of the heated strips, the roll-plating and optionally roller-profiling take place under inert gas or take place with oxidizing strips under a reducing atmosphere. The height of the inductively produced temperature (T i) is 500-900[deg] C and the height of the temperature produced by the laser is 300-900 K. The cooling speed of the roll-plated strips is adjusted by passing through to the cooling section, so that a normalized structure results in the area of the coating material. The cross section and width of the strips of the basic material is larger than the cross section and the width of the strips of the coating material and the roll-plated strip (P) is deformed to a semi-finished product (H) under using the inductively produced temperature and the temperature produced by laser effect, so that the hardenable coating material is completely embedded into the geometry of the semi-finished products. An independent claim is included for a device for producing metallic material composites and composite semi-finished products by hot-roll plating using laser support.