Ultrasonic Welding Station Synchronization for Faster Weld Cycles
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Solution Overview
Problem
Automated mass production of ultrasonically welded parts requires inefficient and time-consuming processes due to the need to independently conduct steps such as bringing a sonotrode into contact with parts, activating it, welding, and then moving it away, with no effective method to determine defective welds.
Innovation Solution
A method and system for ultrasonic welding that includes aligning workpieces with a lift, raising them into contact with a horn for welding, monitoring weld parameters, and synchronizing operations to efficiently complete the welding process while determining potential defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated mass production processes are used for ultrasonic welding, then productivity increases, but cycle time increases due to independent execution of each process step
Solution Approach 1:
The horn is energized to generate vibrational energy before contacting the workpieces, and the lift raises workpieces into position in advance of the welding operation. This preliminary preparation eliminates waiting time during the welding cycle, allowing the process to proceed without interruption once contact is made.
Solution Approach 2:
The patent maintains continuous operation by keeping the horn energized and ready to weld, and by continuously raising and lowering workpieces through the lift mechanism. The automated system ensures that no time is lost between welding operations, with the next set of workpieces already in position as soon as the previous weld completes.
2Ease of manufacture
If traditional ultrasonic welding processes are used, then welding can be completed, but the process is time-consuming and inefficient
Solution Approach 1:
Workpieces are raised into contact with the horn and positioned in advance before the actual welding begins. The horn is energized beforehand to ensure immediate welding capability upon contact, eliminating setup and positioning delays during the welding cycle.
Solution Approach 2:
The patent replaces manual operation with an automated lift mechanism that precisely controls the raising and lowering of workpieces. This mechanical automation ensures consistent, rapid positioning and eliminates the time-consuming manual intervention required in traditional welding processes.
3Loss of time
If automated synchronization is implemented, then cycle time is reduced, but device complexity increases
Solution Approach 1:
The control system performs multiple functions: it coordinates the lift mechanism, controls horn energization timing, monitors welding parameters, and manages the sequencing of workpiece presentation. By consolidating these control functions into a single automated system, the patent reduces overall system complexity while achieving precise synchronization.
Solution Approach 2:
The system uses feedback from sensors and monitoring devices to detect welding parameters and workpiece position in real-time. This feedback enables the control system to automatically adjust and synchronize operations, ensuring optimal cycle time without requiring complex manual coordination or oversimplified open-loop control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates seamless and efficient ultrasonic welding with reduced cycle times and improved weld quality by synchronizing the horn's energy application and monitoring parameters to ensure consistent and timely termination of the welding operation.
Implementation Method 1
transmitting vibrational energy from the horn to the set of workpieces to weld the workpieces together
Data Source
AI summary
A method of ultrasonic welding in an automated mass production process includes: (a) advancing a pallet to move a set of workpieces in the pallet into alignment with a lift of an ultrasonic welding station; (b) operating the lift to raise the set of workpieces out from the pallet and into contact with a horn of the ultrasonic welding station; (c) when the set of workpieces are in contact with the horn, transmitting vibrational energy from the horn to the set of workpieces to weld the workpieces together in a welding operation; and (d), after (c), operating the lift to lower the set of workpieces out of contact with the horn and back into the pallet.