Patent EA-002047-B1 (EA)
Title: Method for produsing a hoop in a combined casting and rolling apparatus and device for realising the same
Inventor: MAIOROV ALEXEI IVANOVICH
IPC: B22D11/20
Filed: 1999-04-23
Abstract: 1. A method for producing a hoop in a combined casting and rolling apparatus involves continuously casting a bar slab while maintaining a constant level of metal in the crystalliser, heating of the slab induction and rolling said slab, characterized in that the continuous casting and the rolling of the slab are carried out according to a continuous process so that during the initial step of the process, the metal is maintained at a constant level in the crystalliser by controlling the speed of the draw rolls of the slab continuous-casting machine and at the beginning of the rolling process, the function of the draw rolls for maintaining a constant level of metal in the crystalliser is transferred to a first cage of the rolling mill, before the rolling process, the induction heating of the slab is carried out in two groups of inductors operating under two currents, wherein the first group of inductors, due to the feed-forward conditions, has a nominal, constant and non-adjustable power, while the second group has an adjustable power, the capacity of which is set in each induction section based on the temperature measured on the slab surface and the speed of its movement. 2. The method of claim 1, characterized in that the capacity of heat current in each section of the adjustable group of indicators is set based on the speed of the slab movement, measurement of the temperature on its surface at the input of the first group of inductors and at the output from the second induction group by the formula: Nper = K*V*(2t3<cp> - 1,19t1<n> - 0,652t2<n> - 273) - A where Nper.is the capacity of adjustable heat current, kwt; V is the speed of slab drawing, m/sec; t1<n> - t2<n> is the temperature of the slab surface at the input to the first induction group and at the output from the second induction group, C degree ; t3<cp> is a preset mean value of the slab surface temperature before rolling, C degree ; K is a coefficient, taking into an account cross-section of the slab being cast, equal to 1,02 - 1,38; A is a constant value of the adjustable current capacity equal to 350 - 380, wherein during the initial step of the process the heat currents of the adjustable and non-adjustable of the induction group are set to be equal. 3. A device for producing a hoop in a combined casting and rolling apparatus, said combined casting and rolling apparatus comprises a slab continuous-casting machine with a crystalliser and a system of secondary cooling supporting and drawing rollers, scissors for cutting the front end of a slab with a seed crystal, inductors for slab heating and a rolling mill, characterized in that the inductors and the rolling mill are arranged in the same production line as the crystalliser, wherein the drivers of the machine draw rolls and the driver of the first cage of the rolling mill are connected through a switch to an electric signaling system that comprises a sensor for detecting the level of metal in the crystalliser and the inductors are arranged in two groups, wherein the first group of inductors, due to the feed-forward conditions, has a nominal, constant and non-adjustable power, while the second group has an adjustable power.