Laser Emission Start-Point Control With Boundary Gap Alignment
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Solution Overview
Problem
Existing laser processing devices face increased calculation load and time lag during the transition from approach to correction operations due to the need to calculate the movement position of the laser emission mechanism to maintain a constant distance from the workpiece, which complicates the control process.
Innovation Solution
A control device that generates movement commands for the laser emission mechanism, including an approach command to a boundary gap point and a machining start point movement command, which aligns the unit vector at the boundary gap point with the machining vector at the start point, reducing the calculation load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the control device calculates the movement position of the laser emission mechanism to maintain constant distance during transition from approach to correction operations, then the machining precision is improved, but the calculation load and time lag increase
Solution Approach 1:
The control process is segmented into two distinct operations: approach operation (moving laser emission mechanism to boundary gap point) and correction operation (moving to machining start point). By separating these operations and using different reference positions for each, the calculation complexity is reduced while maintaining machining precision.
Solution Approach 2:
The approach operation is performed as a preliminary action to position the laser emission mechanism at the boundary gap point before the correction operation begins. This preliminary positioning reduces the computational burden during the critical transition phase by establishing a known reference point.
2Measurement precision
If the control device performs correction operation with reference to intersection point between workpiece and central axis, then the gap amount control precision is improved, but the device complexity increases
Solution Approach 1:
The boundary gap point serves as an intermediary reference position between the approach operation and the correction operation. This intermediary point simplifies the control process by providing a transition reference that reduces calculation complexity while maintaining the precision needed for gap amount control.
Data Source
AI summary
A laser processing device includes a laser emission mechanism emitting laser along a unit vector, and a sensor in the laser emission mechanism. A control device includes: a main controller outputting a driving command based on a program; and a displacement command generator generating a displacement command for displacing the laser emission mechanism using a detected value from the sensor, by generating: an approach command for displacing the laser emission mechanism from a control start position toward a laser irradiation point to a boundary gap point where the sensor starts detection; and a processing start point displacement command for displacing the laser emission mechanism from the boundary gap point to a processing start point within a detection range of the sensor. The processing start point displacement command includes a pose change matching the unit vector at the boundary gap point with a processing vector at the processing start point.