Patent DE-102009015209-A1 (DE)
Title: Friction welding head comprises a process-usual equipment, and a holding device, where a joining temperature necessary for a friction welding process is generated by a radiant vibration of the welding parts at a defined rotating point
Inventor: FISCHER WILLI
IPC: B23K20/12
Filed: 2009-03-31
Abstract: The friction welding head (1) comprises a process-usual equipment, and a holding device (11), where a joining temperature necessary for a friction welding process is generated by radiant vibration of the welding parts (12) at a defined rotating point. The radiant vibration is produced by electronically regulated drive system, where the width of the radiant vibration is adjustable. An input-side movement is permuted into radiant vibration over a mechanical transfer system, which is designed, so that the rotation movement is permuted into a vibration movement during switching-on a drive motor. The friction welding head (1) comprises a process-usual equipment, and a holding device (11), where a joining temperature necessary for a friction welding process is generated by a radiant vibration of the welding parts (12) at a defined rotating point. The radiant vibration is produced by an electronically regulated drive system, where the width of the radiant vibration is adjustable. An input-side movement is permuted into radiant vibration over a mechanical transfer system, which is designed, so that the rotation movement is permuted into a vibration movement during switching on a drive motor without significant time delay and the vibration movement of the friction welding head is immediately stopped in spite of running the motor during switching off the drive motor. The vibration movement is produced by a piston rod fixed to a rotating drive shaft outside to the center. An eccentric drive shaft is mounted in a second eccentric shaft with same eccentricity, so that both shafts rotate against each other around up to 180[deg] over an impact system and a pulley rotatably mounted onto the second eccentric shaft. The pulley transfers the eccentric movement as radiant vibration movement to a further pulley fixedly connected with the drive shaft over a toothed belt (8) and to the welding part mounted on the drive shaft using the holding device. The pulley is coupled with a linear balance, which is caused, so that during the eccentric movement, the axis distance between the pulley and the drive shafts (3, 4) is equally kept and a variation of the tension of the toothed belt is prevented. The friction welding head disposes over two drive shafts, which have the holding device for the welding part, where the vibration movements of the drive shafts are coupled with one another, so that several welding processes are parallelly carried out. The holding device is suited beside the reception of the welding parts and alternatively for the reception of a processing tool required for the process. The drive motor disposes over the regulation possibilities of the drive power and number of revolutions. The friction welding head is provided with a measuring device determining the pressing pressure at the welding point. A controller of a feeding device is coupled with the measuring device determining the pressing pressure and regulates the feeding movement over back-coupling. The friction welding head is deployed to check the strength of the welding connection, in which the welding part already connected with the workpiece and simultaneously fixedly clamped in the friction welding head is exposed with reduced rotating movement of the vibration movement and the quality of the joining connection is determined based on the measured possible deviations. The friction welding head is designed as mobile device, which disposes by releasable coupling possibility to the work piece, by which it is temporarily connected with the workpiece during the friction welding process.