Electromagnetic braking device on continuous casting molds

Abstract

To bring about a direct effect on the fluid streams exiting the mould dip tube ( 2 ) of moulds in continuous casting moulds ( 1 ) of a continuous casting plant for casting liquid metals, in particular liquid steel materials for producing slab and thin slab products with format widths of 750 to 3500 mm and format thicknesses of 30 to 500 mm, said casting plant being equipped with an electromagnetic braking device for improving the product quality, it is proposed to dispose at least two poles ( 10 ) per mould broad side ( 3 ) symmetrically with respect to the perpendicular reference line ( 4 ) of the mould dip tube ( 2 ) such that the primary axes ( 12 ) of the poles' outlet cross section ( 11 a ) are aligned at a specific angle (α 1 and α 2 ) relative to the perpendicular reference line ( 4 ) of the mould dip tube ( 2 ).

1 - 17 . (canceled) 
     
     
         18 . A method for casting liquid metals to produce slab and thin-slab products with format widths of 750 to 3,500 mm and format thicknesses of 30 to 500 mm in a continuous casting installation, which is equipped with an electromagnetic braking device that includes coils with cores and a yoke, comprising the steps of: controlling flow conditions within the liquid metal in a mold with a magnetic field effect generated by the electromagnetic braking device; and achieving direct electromagnetic control of streams of liquid emerging from a mold dip tube by arranging at least two poles opposite each other with mirror symmetry on each broad side of the mold and by arranging at least two poles symmetrically to a vertical reference line of the mold dip tube on each broad side of the mold, so that primary axes of exit cross sections of the poles are aligned at an angle a 1  or a 2  of 1° to 89° to a principal flow direction of the dip tube flow. 
     
     
         19 . The method in accordance with  claim 18 , including aligning the primary axes in a well-defined manner so that the primary axes of the poles intersect the vertical reference line of the mold dip tube above the poles at an angle (a 1 ) of 1° to 89° or, alternatively, below the poles at an angle (a 2 ) of 1° to 89°. 
     
     
         20 . The method in accordance with  claim 19 , including manually setting the angles (a 1 , a 2 ) by rotating the poles before operation of the continuous casting installation. 
     
     
         21 . The method in accordance with  claim 19 , including variably adjusting and changing the angles (a 1  and a 2 ) by manual or motorized rotation of the poles during operation of the continuous casting plant, as required. 
     
     
         22 . The method in accordance with  claim 18 , including adjusting field strength of the braking device as a function of throughput of the mold. 
     
     
         23 . The method in accordance with  claim 18 , including operating the braking device with a permanent field and adjustable field strength by direct current. 
     
     
         24 . The method in accordance with  claim 18 , including operating the braking device with alternating field strength and possible reversal by alternating current. 
     
     
         25 . A mold of a continuous casting installation for casting liquid metals to produce slab and thin-slab products with format widths of 750 to 3,500 mm and format thicknesses of 30 to 500 mm, comprising an electromagnetic braking device that includes coils with cores and a yoke, the braking device being operative to generate a magnetic field effect to control flow conditions within liquid metal in the mold, wherein at least two poles are arranged opposite each other with mirror symmetry on each broad side of the mold, and at least two poles are arranged symmetrically to a vertical reference line of a mold dip tube on each broad side of the mold so that a direction of primary axes of exit cross sections of the poles substantially corresponds to principal flow directions of the dip tube flow, and wherein the primary axes intersect the vertical reference line of the mold dip tube above the poles at an angle (a 1 ) of 1° to 89° or, alternatively, below the poles at an angle (a 2 ) of 1° to 89°. 
     
     
         26 . The mold in accordance with  claim 25 , wherein the poles have various exit cross sections which are formed with a primary axis. 
     
     
         27 . The mold in accordance with  claim 26 , wherein the poles have various exit cross sections selected from the group consisting of: a triangle, rectangle, any desired polygon, or with a curved contour. 
     
     
         28 . The mold in accordance with  claim 25 , wherein the poles are aligned in a stationary geometric arrangement on the mold at the angle (a 1 , a 2 ) to the vertical reference line of the mold dip tube. 
     
     
         29 . The mold in accordance with  claim 25 , wherein the poles are rotatable for manual or motorized adjustment of the angle (a 1  or a 2 ) before or during operation of the continuous casting installation. 
     
     
         30 . The mold in accordance with  claim 29 , and further comprising a motor, a hydraulic rotary drive, a hydraulic cylinder or a pneumatic cylinder for motorized adjustment of the angles. 
     
     
         31 . The mold in accordance with  claim 29 , wherein a center of rotation of the pole lies on the primary axis of the pole. 
     
     
         32 . The mold in accordance with  claim 29 , wherein a center of rotation of the pole lies outside the pole. 
     
     
         33 . The mold in accordance with  claim 25 , wherein the electromagnetic braking device with the magnetic coils, the cores and the yoke is positioned directly on the mold and oscillates together with the mold during operation of the continuous casting installation. 
     
     
         34 . The mold in accordance with  claim 25 , wherein the electromagnetic braking device is permanently mounted separate from the mold and does not oscillate together with the mold. 
     
     
         35 . The mold in accordance with  claim 25 , wherein the electromagnetic braking device is divided into separate parts so that ends of the poles are arranged on the mold, and the magnetic coils, the core, and the yoke are positioned on a stationary machine structure.