Mounting Board Placement Accuracy During Thermal Drift
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Solution Overview
Problem
The existing mounting board manufacturing systems face a decline in placement position accuracy when resuming operations after a period of continuous production has stopped, due to thermal deformation and temperature changes affecting the component placing mechanisms.
Innovation Solution
The system incorporates a component placer with a placing head and mover, an inspector for imaging the board, a correction value calculator, and a correction value changer that updates and adjusts the correction values based on new inspection results and device state data, ensuring accurate placement by changing the correction value when resuming operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous production is stopped and then resumed, then the component placing mechanism can be maintained or repositioned, but the placement position accuracy deteriorates due to thermal deformation changes
Solution Approach 1:
The system implements feedback by detecting the stop/resume state of the component placing mechanism and automatically adjusting the correction value accordingly. When the operation stops and resumes, the state detector identifies this change and triggers the correction value changer to modify the correction value, ensuring placement accuracy is maintained despite thermal deformation changes during idle periods
Solution Approach 2:
The system changes the correction value parameter based on the operational state. When the component placing mechanism stops and resumes operation, the correction value is automatically adjusted to compensate for thermal deformation that occurs during the stop period, thereby maintaining placement position accuracy without requiring manual intervention
2Manufacturing precision
If the correction value is continuously updated during operation, then placement position accuracy is maintained, but the system complexity increases
Solution Approach 1:
The correction value changer operates autonomously based on stop/resume detection without requiring manual intervention. The state detector automatically identifies when the component placing mechanism stops and resumes, and the correction value changer automatically adjusts the correction value accordingly, making the system self-regulating and reducing operational complexity
Solution Approach 2:
The correction value is dynamically adjusted based on the operational state of the component placing mechanism. Rather than using a fixed correction value, the system adaptively changes the correction value when stop/resume events occur, allowing the system to respond to changing thermal conditions while maintaining simplicity through event-driven updates
Data Source
AI summary
A mounting board manufacturing system includes: a component placer including a placing head and a placing head mover that moves the placing head to a target position for placing the component on the board; an inspector that inspects a placement position of the component by imaging the board; a correction value calculator that calculates a correction value for correcting the target position; a target position calculator that calculates the target position using the correction value; and a correction value changer that changes a latest correction value used immediately before stopping an operation of the component placer to a correction value different from the latest correction value when the operation is resumed.