Patent EP-2243584-A1 (EP)
Inventor: MUELLER WILLI
IPC: B23K11/06
Filed: 2010-04-14
Abstract: The device comprises a rounding apparatus, a conveying assembly for a rounded frame blank with a Z-rail (3) and a head piece, a calibrating tool (4) having calibrating rollers (5), a welding device with wire intermediate electrodes as welding electrodes, a device for detecting disturbance variables influencing welding seam quality during the production process, and a device for the compensation of the influence of the disturbance variables on welding seam quality using control variables. The detecting device is designed to detect the disturbance variables from a property of a frame material. The device comprises a rounding apparatus, a conveying assembly for a rounded frame blank with a Z-rail (3) and a head piece, a calibrating tool (4) having calibrating rollers (5), a welding device with wire intermediate electrodes as welding electrodes, a device for detecting disturbance variables influencing welding seam quality during the production process, and a device for the compensation of the influence of the disturbance variables on welding seam quality using control variables. The detecting device is designed for detecting the disturbance variables from a property of a frame material and is designed to determine the geometry of the sheet metal section as property of the frame material and/or to determine the presence of the eyebrows at the sheet metal section. The compensating device is aligned for changing the following control variables such as horizontal and/or vertical movement of the Z-rail influencing the overlapping or its head piece pointing to the calibrating tool by a displacement drive, horizontal and/or vertical displacement of the calibrating tool by the displacement drive, radial displacement of the calibrating rollers by the displacement drive and/or variation of the roller force acting on the frame, variation of a welding force and variation of welding currents and/or distances of the welding points. The detecting device is designed to detect the tinning of an edge zone as property, to detect the strength of the sheet metal, to detect the welding area between the welding at high temperature and the welding at low temperature as disturbance variables and to detect the electrical surface resistance of the sheet metal as disturbance variables, so that the compensating device is aligned for changing the following control variables such as variation of the welding force and variation of welding currents and/or distances of the welding points, is designed to detect the rounding properties of the sheet metal and whose yield points as disturbance variables, so that the compensating device is aligned for changing the following control variables such as influence of the rounding by feeding opening the rounding apparatus, variation of the welding force and variation of welding currents and/or distances of the welding points, and is designed to detect the overlapping of the edges of the frame blank such as geometries and parameters of the frame blank as disturbance variables, to detect the temperature of one of the welding electrodes or the temperature of the calibrating tool as disturbance variables and to determine the property such as wire profiling of the wire electrode system as disturbance variables, so that the compensating device is aligned for changing the following control variables such as variation of welding currents and/or distances of the welding points. An independent claim is included for a method for producing container frames made of tinned sheet metal.