Laser Beam Rotation Control for Accurate Hole Shape Drilling
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Solution Overview
Problem
Laser processing machines face challenges in achieving accurate shape drilling, particularly in maintaining uniformity and straightness of hole shapes, especially when drilling materials like metals, resins, and ceramics, as existing systems struggle to control the polarization and irradiation angle of laser beams effectively.
Innovation Solution
A laser processing machine is designed with a polarization rotator unit, beam rotator unit, condensing optical system, rotational driving unit, and controlling unit, which includes a wave plate and rotation mechanisms to adjust the polarization direction and irradiation angle of the laser beam, allowing for precise control of the polarized state and rotational speed ratio to achieve accurate shape processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional laser processing is used without polarization and beam rotation control, then the processing speed is maintained, but the shape accuracy and uniformity of drilled holes deteriorate
Solution Approach 1:
The patent applies dynamics by making the polarization state and beam irradiation angle variable through rotation mechanisms. The polarization rotator unit rotates the wave plate to dynamically adjust polarization direction, while the beam rotator unit dynamically changes the irradiation angle by making the incident laser beam eccentric to output. This dynamic control enables precise shape accuracy throughout the drilling process without requiring an overly complex static system configuration.
Solution Approach 2:
The patent implements parameter changes by controlling the rotational speed ratio between the first rotation mechanism (polarization rotator) and the second rotation mechanism (beam rotator). By adjusting this rotational speed ratio, the system changes the polarization state parameters in real-time during laser processing, enabling precise control over hole shape uniformity and accuracy while maintaining manageable system complexity through a unified control approach.
2Manufacturing precision
If the laser beam is made to drill through materials with high precision requirements, then the shape uniformity improves, but the processing time increases
Solution Approach 1:
The patent applies continuity of useful action by synchronously rotating the polarization rotator unit and beam rotator unit throughout the entire laser drilling process. This continuous rotation ensures that the optimized polarization state and irradiation angle are maintained consistently from the incident side to the output side of the workpiece, achieving shape uniformity without requiring multiple separate processing steps that would increase total processing time.
Solution Approach 2:
The patent implements periodic action through the rotational motion of the wave plate and irradiation angle adjusting optical system. By setting appropriate rotational speeds, the system periodically adjusts the polarization direction and beam angle in a controlled manner, creating optimal conditions for shape uniformity at regular intervals throughout the drilling process, thereby balancing precision requirements with processing efficiency.
3Manufacturing precision
If the irradiation angle is adjusted to optimize hole shape, then the manufacturing precision improves, but the device complexity increases
Solution Approach 1:
The patent applies merging by integrating the irradiation angle adjustment function directly into the beam rotator unit that is already part of the optical path. The irradiation angle adjusting optical system is combined with the existing beam delivery system, and its rotation is synchronized with the polarization rotator unit. This merging approach enables precise hole shape control without adding a completely separate complex adjustment mechanism.
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
The machine enables fine processing of accurate shapes, including quadrangle and radially polarized patterns, by synchronously controlling the rotation of the polarization and beam rotator units, resulting in precise drilling with consistent shape retention on both the incident and output sides of the workpiece.
Implementation Method 1
the polarization rotator unit includes a wave plate and a first rotation mechanism, the wave plate is intended to change a polarization direction of the laser beam
Implementation Method 2
the irradiation angle adjusting optical system can adjust an irradiation angle of the laser beam to the workpiece by making an incident laser beam eccentric to output and making the laser beam incident on the condensing optical system at a position eccentric from a central axis
Implementation Method 3
the condensing optical system can condense the laser beam on the workpiece
Data Source
AI summary
A laser processing machine including: a laser source that emits a laser beam; a polarization rotator unit; a beam rotator unit; a lens; and a controller, which apply the laser beam to a workpiece, the polarization rotator unit includes a wave plate and first actuator that rotates the wave plate, the beam rotator unit includes an optical system that adjusts an irradiation angle of the laser beam to the workpiece by making an incident laser beam eccentric to output and making the laser beam incident on the lens at a position eccentric from a central axis, a second actuator rotates the optical system, the lens condenses the laser beam on the workpiece, the controller controls a rotational speed ratio between the first actuator and the second actuator, and adjusts a polarized state of the laser beam by controlling the rotational speed ratio.