Ultrasonic press using servo motor with delayed motion

摘要

An ultrasonic welding system includes a motion control system that is coupled to and that causes controlled movement of an ultrasonic welding stack, in accordance with control inputs that are based on one or more control signals that are received from one or more sensors. The motion control system initiates a welding operation, subsequent to which an initial motion delay occurs until a predetermined condition is satisfied. Subsequently, in response to the predetermined condition being satisfied, the ultrasonic welding stack is caused to move in accordance with a weld profile. Subsequently, in response to an occurrence of a predetermined delay initiating condition, the ultrasonic welding stack is caused to stop motion and to maintain a stationary position. Subsequently, in response to an occurrence of a predetermined delay terminating condition, motion of the ultrasonic welding stack is resumed in accordance with the weld profile.

主权项

1. An ultrasonic welding system comprising:
an ultrasonic welding stack movable, in response to control inputs, to initiate a welding operation by applying vibrational energy to a workpiece; one or more sensors to measure at least one control variable and to output a control signal corresponding to the at least one control variable; and a motion control system coupled to and causing controlled advancing movement of the ultrasonic welding stack, the motion control system being responsive to the control inputs based on one or more control signals received from the one or more sensors, the motion control system including
initiating the welding operation by applying vibrational energy to a workpiece,subsequent to the initiating of the welding operation, optionally initially delaying any advancing movement of the ultrasonic welding stack until one or more of the control signals indicate that respective control variables satisfy a predetermined condition,subsequent to the optional initial delay and in response to the predetermined condition being satisfied, causing the ultrasonic welding stack to advance in accordance with a weld profile,subsequent to the ultrasonic welding stack moving in accordance with the weld profile, causing the ultrasonic welding stack to stop advancing movement and maintain a stationary position in response to an occurrence of a predetermined delay initiating condition, andin response to an occurrence of a predetermined delay terminating condition, resume advancing movement of the ultrasonic welding stack in accordance with the weld profile,wherein vibrational energy continues to be applied to said workpiece while said ultrasonic welding stack is stopped and while the advancing movement of the welding stack continues.