Patent EP-2283946-A2 (EP)
Title: Method and device for producing parabolic guides and parabolic springs for, in particular, vehicle chassis, vehicle bodies and the like
Inventor: TEMMEN HUBERT
IPC: C21D9/02
Filed: 2010-07-30
Abstract: The method for producing parabolic- or leaf springs for vehicle chassis and vehicle bodies made of workpieces (3), which are subjected to a heating process, a subsequent rolling process, further processing steps, a hardening process and a final tempering process, comprises heating the workpiece in a furnace at 1000-1400[deg] C after required separation, feeding the workpiece to a cutting device and then subjecting to a cutting-to-length process at 1000-1300[deg] C, feeding the workpiece to a rolling device and then rolling at 800-1300[deg] C, and transporting the workpiece to a straightening device. The method for producing parabolic springs or leaf springs for vehicle chassis and vehicle bodies made of workpieces (3), which are subjected to a heating process, a subsequent rolling process, further processing steps, a hardening process and a final tempering process, comprises heating the workpiece in a furnace at 1000-1400[deg] C after a required separation, feeding the workpiece to a cutting device and then subjecting to a cutting-to-length process at 1000-1300[deg] C, feeding the workpiece to a rolling device and then rolling at 800-1300[deg] C, transporting the workpiece to a straightening device and then bent- or roll-straightening at 750-1250[deg] C, transporting the workpiece to a processing device and then carrying out a cutting process, stamping process, embossing process and/or labeling process, transporting the workpiece to a further processing device, in which an eye shaping process is carried out at 750-1200[deg] C and a compressing process is carried out at 700-1200[deg] C, subjecting the workpiece to an offset process, a bending process and/or a forging process in partial steps or in a process at 700-1200[deg] C, feeding the workpiece to a hardening process at a hardening temperature of 700-1200[deg] C without further heating, and subjecting the hardened workpiece to an annealing process in a continuous furnace at 250-600[deg] C with or without subsequent cooling sections. The heating of the workpieces takes place at 1000-1400[deg] C continuously or gradually in a flow, and takes place in a gas furnace, electric furnace, induction furnace or conduction furnace. The cutting-to-length of long workpieces takes place in a flying manner or a non-flying manner, and by cut-off grinding, flame cutting or shearing process. The rolling of the workpieces takes place by roller pairs (2) after fixing the workpiece in a clamping unit (1), where initially an area is rolled by the roller pairs and then the workpiece is again passed with the rolled area to a second clamping unit and is fixable and then the unrolled area is rolled using the roller pairs. One of the clamping units is translationally processable to the other clamping unit for a transfer process of the workpiece, where the both clamping units are processed for the transfer process of the workpiece. The workpiece is admitted for rolling two roller pairs and the clamping unit transports the workpiece to the roller pairs during the rolling process. The clamping unit is processed relative to the workpiece. The workpiece is admitted by the two roller pairs, which extend outside of the clamping unit, where the clamping pairs are moved back and forth during the rolling process. The bent- or roll-straightening step takes place parallel to the both sides of the workpieces at 750-1250[deg] C. The processing of the workpieces takes place in the row sequences of cutting, stamping and embossing processes with the subsequent labeling process. The cut-off grinding, flame cutting or shearing process of the workpiece takes place in partial steps or in the process. The annealing process takes place in the continuous furnace at the 250-600[deg] C. An independent claim is included for a device for producing parabolic springs or leaf springs for vehicle chassis and vehicle bodies made of workpieces.