The invention relates to a method for cutting up punching scrap running as waste from a punching device, in particular from a fine blanking press, by means of a waste-cutting device, in particular which is arranged as a progressive tool with respect to the punching device, wherein, by way of the waste-cutting device, the punching scrap is completely cut through perpendicularly to the running direction thereof at a cutting edge by a cutting knife and in this way punching-scrap portions are formed, wherein, together with the stroke of the cutting knife, at least one scrap web of the punching scrap that is spaced apart from the punching-scrap boundaries is cut through by at least one punch which is spaced apart from the cutting knife, preferably by at least two punches, in particular so that each punching-scrap portion is subdivided into at least two punching-scrap sub-portions. The invention also relates to a waste-cutting device of a punching device, comprising a cutting knife and a cutting edge, wherein, by way of the interaction of cutting knife and cutting edge during a stroke of the cutting knife, punching scrap which can be passed through between cutting knife and cutting edge in a running direction can be completely cut through perpendicularly to the running direction, in which, spaced apart from the cutting knife, provision is made of at least one punch which is arranged in a locationally fixed manner with respect to the cutting knife and which can be moved together with the cutting knife, in particular by way of which at least one scrap web of the punching scrap can be cut through in the punching scrap.

The present invention makes it possible to obtain a fine finish along a trim line in a plate material while preventing scoring between a floating cutter and a main trimming press upper. A floating cutter unit is provided with: a floating cutter for cutting scrap from a plate-shaped material, said floating cutter being attached to and used in a trimming press processing device that cuts scrap from a plate material along a trim line Tr and that additionally cuts scrap along a scrap cut line Sc; a holder set for holding the floating cutter so as to be movable in the direction of an axial center O; a spring that is brought into contact with the tail end surface of the floating cutter and that applies reaction force to the floating cutter; and a pair of cutters that are attached to the holder set and positioned on both sides of the floating cutter along the trim line Tr.

A production line for recycling and processing waste materials of steel rolling, the production line including: an electromagnetic hoisting equipment; a conveying platform; a clamping-and-feeding device; a segmentation shear; a swing conveyor device; a pushing device; a rolling-type shearing machine; a chain-type conveyor track; a material guiding device; two shredding-type shearing machines; and a scrap collection device. The electromagnetic hoisting equipment is connected to the conveying platform, and is configured to hoist waste materials of steel rolling to the conveying platform; the conveying platform is connected to the clamping-and-feeding device, and is configured to convey the waste materials to the clamping-and-feeding device; the segmentation shear cooperates with the clamping-and-feeding device and is configured to segment the waste materials of steel rolling into steel plates; the pushing device is configured to push the steel plates to the rolling-type shearing machine.

A production line for recycling and processing waste materials of steel rolling, the production line including: an electromagnetic hoisting equipment; a conveying platform; a clamping-and-feeding device; a segmentation shear; a swing conveyor device; a pushing device; a rolling-type shearing machine; a chain-type conveyor track; a material guiding device; two shredding-type shearing machines; and a scrap collection device. The electromagnetic hoisting equipment is connected to the conveying platform, and is configured to hoist waste materials of steel rolling to the conveying platform; the conveying platform is connected to the clamping-and-feeding device, and is configured to convey the waste materials to the clamping-and-feeding device; the segmentation shear cooperates with the clamping-and-feeding device and is configured to segment the waste materials of steel rolling into steel plates; the pushing device is configured to push the steel plates to the rolling-type shearing machine.

The present invention makes it possible to obtain a fine finish along a trim line in a plate material while preventing scoring between a floating cutter and a main trimming press upper. A floating cutter unit is provided with: a floating cutter for cutting scrap from a plate-shaped material, said floating cutter being attached to and used in a trimming press processing device that cuts scrap from a plate material along a trim line Tr and that additionally cuts scrap along a scrap cut line Sc; a holder set for holding the floating cutter so as to be movable in the direction of an axial center O; a spring that is brought into contact with the tail end surface of the floating cutter and that applies reaction force to the floating cutter; and a pair of cutters that are attached to the holder set and positioned on both sides of the floating cutter along the trim line Tr.

A production line for recycling and processing waste materials of steel rolling, the production line including: an electromagnetic hoisting equipment; a conveying platform; a clamping-and-feeding device; a segmentation shear; a swing conveyor device; a pushing device; a rolling-type shearing machine; a chain-type conveyor track; a material guiding device; two shredding-type shearing machines; and a scrap collection device. The electromagnetic hoisting equipment is connected to the conveying platform, and is configured to hoist waste materials of steel rolling to the conveying platform; the conveying platform is connected to the clamping-and-feeding device, and is configured to convey the waste materials to the clamping-and-feeding device; the segmentation shear cooperates with the clamping-and-feeding device and is configured to segment the waste materials of steel rolling into steel plates; the pushing device is configured to push the steel plates to the rolling-type shearing machine.

An air nozzle for guiding a cut steel strip at the exit from a shearing device for a moving steel sheet is provided. The nozzle is made in one piece and extends along a main plane perpendicular to the direction of movement of the steel strip. The air nozzle includes an air inlet channel with a free end connected to a compressed air generator and an opposite end divided at a deflection junction into a first and a second air discharge channel facing each other on either side of the main plane. The free end of the first air discharge channel is located close to the exit and includes a plurality of first air discharge orifices orientated towards the second air discharge channel. The free end of the second air discharge channel includes a plurality of second air discharge orifices orientated either in the opposite direction to the first air discharge channel or parallel to the main plane so none of the first and second air discharge orifices are orientated in the opposite direction to the direction of movement of the steel sheet.

A slitting machine for threading scrap material has first and second arbors. A first set of rotary knives are disposed on each of the first and second arbors having a first diameter. A second set of rotary knives are disposed on each of the first and second arbors having a second diameter. The second diameter is smaller than the first diameter. As the arbor gap is closed, the first set of rotary knives cut edge trim and when the arbor gap is further closed, the second set of rotary knives cut mutts from the strip.