Method for controlling machine parameters in friction welding
AssigneeBranson Ultraschall Niederlassung der Emerson Technologies GmbH & Co.
InventorsAlois K. H. Schlarb, Gottfried W. Ehrenstein
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Abstract
In vibration welding the process takes place in a number of phases. The qity of the welding connection depends on which phase is reached during vibration and which conditions prevail in the phase 3 of the vibration process. According to the invention the welding machine is provided with a measuring and controlling system for the displacement distance to determine when the phase 3 of the process is safely reached and to control the joining velocity in this phase.
Claims19
In a friction welding process having the steps of contacting a plurality of members to be connected in a contact zone, subjecting at least one of the members to an oscillatory vibration motion relative to at least one other of the members which causes portions of the members in the contact zone to melt, displacing said members toward each other by applying a joining force and terminating the vibration to obtain an integral connection of the members in the contact zone during a cooling down period, the improvement comprising the steps of periodically determining joining velocities of the members while the members are being displaced toward each other and terminating the vibration after the members attain a constant joining velocity.
An apparatus for friction welding a plurality of members comprising a measuring means for measuring displacement distances of the members while subjecting at least one of the members to an oscillator vibrating motion relative to at least one of the other members, a determining means for receiving the displacement distances from the measuring means and determining instantaneous joining velocities of the members, a comparing means for receiving the instantaneous joining velocities from the determining means, comparing the instantaneous joining velocities, and transmitting a termination signal when the instantaneous joining velocities attain a constant value, and a switching means for terminating the vibrating motion when the termination signal is received from the comparing means.
An apparatus for friction welding a plurality of members comprising a measuring means for measuring displacement distances of the members while subjecting at least one of the members to an oscillatory vibrating motion relative to at least one of the other members, a determining means for receiving the displacement distances from the measuring means and determining instantaneous joining velocities of the members, a comparing means for receiving the instantaneous joining velocities from the determining means, comparing the instantaneous joining velocities, and generating an output signal when the instantaneous joining velocities attain a constant value, a delaying means for terminating the vibrating motion after a predetermined time delay in response to the output signal of the comparing means, a control means for receiving the instantaneous joining velocities from the determining means, comparing the instantaneous joining velocities to a desired joining velocity value and generating a control signal in response thereto, and a drive means for driving the members at a controlled joining velocity in response to the control signal from the control means during the predetermined time delay.
Dependencies are inferred from the claim text.