Patent ID: 8683898
Filing Date: 2014-04-01
Classification: B23D,Y10T

Abstract:
1. A method of operating a high-speed shear for transversely cutting rolled strip with opposing gear wheels arranged in a pair, driven in synchronous opposite rotation and in permanent engagement with each other, the gear wheels having shafts that support knife carriers, the shafts being mounted in eccentric bushings in a shear cassette within an outer frame, the shear cassette includes a lifting device for raising and lowering the shear cassette within the outer frame and means for guiding the strip relative to a cutting position, wherein each of the knife carriers is a flat body with two long sides and two short sides, and wherein one of the short sides of each knife carrier has a knife arrangement, and wherein the knife arrangements are configured to interact in the cutting position, wherein the eccentric bushings are driven by a gear unit with a fixed predefined gear ratio, the method comprising carrying out a start-up of a shearing operation by accelerating a rate of rotation of the gear wheels, changing a distance between the knife carriers via the eccentric bushings, and lowering the shear cassette with the lifting device of the shear cassette, wherein time required for the acceleration of the start-up of the shearing operation is defined by the gear ratio between the eccentric bushings and the knife carriers, wherein the knife carriers are synchronized for opposite rotation within the shear cassette through the gear wheels of the knife carriers which are in constant engagement with each other, the gear wheels of the knife carriers having a tooth geometry such that a relative axial displacement of the knife carriers of plus/minus 15 mm is possible.