Counterforce Drive for Component Placement
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Solution Overview
Problem
Component placement devices face challenges in achieving high-speed and accurate component placement due to reactive forces causing vibrations and deformations in the machine frame, which affect the positioning accuracy of other component pickup units, known as dynamic crosstalk.
Innovation Solution
The implementation of a counterforce system that determines and applies a counterforce in the direction of movement to counteract the reactive forces exerted by component pickup units, using a drive unit that can include permanent magnets and electrically energizable coils, and a freestanding auxiliary frame to suppress these forces, ensuring minimal interference with the machine frame and other subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the component pickup unit is moved with high acceleration to achieve high-speed placement, then the placement speed is improved, but reactive forces cause vibrations and deformations of the machine frame, worsening positioning accuracy
Solution Approach 1:
The patent applies preliminary anti-action by using a counterforce drive unit to generate opposing forces before and during the movement of component pickup units. The control unit calculates required counterforces based on movement parameters and applies them through the counterforce drive unit to the subframe, preventing vibrations and deformations before they occur, thus maintaining positioning accuracy during high-speed operation
Solution Approach 2:
The patent implements the counterweight principle by introducing a counterforce drive unit that generates forces opposing the reactive forces from component pickup unit movement. The drive unit applies these counterforces to the subframe, effectively balancing the dynamic loads and preventing machine frame vibrations, thereby maintaining positioning accuracy during high-speed placement operations
2Manufacturing precision
If the machine frame is made heavier and stiffer to absorb reactive forces, then positioning accuracy is improved, but the production cost and operational cost increase
Solution Approach 1:
The patent replaces the traditional mechanical solution of using a heavier and stiffer machine frame with an active control system. Instead of increasing structural mass and stiffness, the system uses sensors to detect movements and a counterforce drive unit to generate compensating forces, achieving the same vibration suppression effect without the associated cost increases
Solution Approach 2:
The patent changes the approach from static structural parameters (frame mass and stiffness) to dynamic control parameters. The control unit continuously adjusts counterforce magnitude and direction based on real-time movement parameters of component pickup units, achieving vibration suppression through active parameter adjustment rather than passive structural design
3Manufacturing precision
If the acceleration of the component pickup unit is reduced to minimize reactive forces, then vibrations are reduced, but the number of components moved per unit time decreases
Solution Approach 1:
The system applies preliminary anti-action by calculating and applying counterforces before and during component pickup unit movement. This allows the system to maintain high acceleration for productivity while the counterforce actively cancels out the reactive forces that would otherwise cause vibrations, thus maintaining both speed and precision
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
This solution significantly reduces or eliminates vibrations and deformations, thereby preventing dynamic crosstalk and allowing for accurate component placement with reduced impact on the machine frame, enabling high-speed operation without compromising accuracy.
Implementation Method 1
a drive unit for exerting the counterforce determined by said means substantially in the direction of movement on the subframe
Data Source
AI summary
A method for driving a component placement device, the component placement device having a machine frame, component pickup units and a subframe, the first and second component pickup units configured to be movable in a direction of travel, the method comprising: moving at least one of the component pickup unit in the direction of movement relative to the subframe, the component pickup units and the subframe configured for a reactive force to be exerted on the subframe by the moving of the at least one of the component pickup units; determining a counterforce to be exerted against the subframe substantially opposite a direction of the reactive force, the counterforce determined by an auxiliary control unit, wherein the counterforce at least partially counteracts the reactive force; and applying the counterforce to the subframe substantially in the opposite direction of the reactive force by at least one drive unit.