A SYSTEM FOR RELIABLE CROP SHEAR TAIL END CUTTING IN HOT STRIP MILL

摘要

A system for precise cutting of the tail end of transfer bar at crop shear before finishing stand in a hot strip mill involving Fiber Optic Hot Metal Detectors (HMD), Pulse tacho and controller means. In the above system the pulse tacho is adapted to sense the rotational speed of the pinch roll having constant diameter. The controller means is adapted to calculate and convert the input data to linear speed of the strip. This linear speed is fed as 0 to +10 V signal to the crop shear drive as reference speed signal. Thus the optimized tail end cutting of transfer bars are achieved by synchronizing strip and shear speed with an appropriate time lag. The present system enables detection and cutting of tail end of all transfer bars as per the desired length precisely and reliably, improving the product quality, yield and mill productivity and thus ensuring wide industrial application in hot strip mills of steel plants.