Laser Groove Shielding Plate Layout for Uniform Steel Sheet Processing
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Solution Overview
Problem
The existing groove processing devices using laser beams on steel sheets face issues with non-uniform groove formation and contamination of optical components due to laser beam division at the corners of the polygon mirror, leading to shallow end portions and potential misprocessing of unintended areas.
Innovation Solution
A groove processing device and method that incorporates a shielding plate positioned between the condensing optical system and the object, inclined at a specific angle relative to the surface, to block laser beams that do not form the groove, while using a transparent window plate to transmit beams and a position adjustment mechanism to ensure uniform groove depth and prevent optical component contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a shielding plate is provided to block laser beams that do not form the groove, then uniform groove processing and groove depth are achieved, but the shielding plate is processed and optical components are contaminated by minute pieces generated by the processing
Solution Approach 1:
A transparent window plate is introduced as an intermediary component between the shielding plate and the laser beam path. The window plate allows the laser beam to pass through while preventing direct contact between the laser beam and the shielding plate, thereby eliminating the generation of contaminating minute pieces. The shielding plate still performs its function of blocking unnecessary laser beams, but the window plate mediates the interaction to prevent contamination of optical components.
2Adaptability or versatility
If the laser beam is incident on a corner portion of the polygon mirror, then the laser beam is divided into two beams, but the end portion of the groove is processed with insufficient energy densities resulting in shallow grooves
Solution Approach 1:
The shielding plate is configured to selectively block the divided laser beams (LB1 and LB2) that are reflected from the corner portions of the polygon mirror. By extracting and removing these problematic divided beams using the shielding plate, only the desired single laser beam that forms the groove with proper energy density reaches the workpiece, ensuring uniform groove depth throughout the scanning area.
3Manufacturing precision
If the divided laser beams are irradiated in a direction different from the original laser beam, then groove formation is affected, but positions different from the intended groove position or other devices may be erroneously processed
Solution Approach 1:
The shielding plate serves as an intermediary element positioned in the laser beam path to intercept and block the divided laser beams that are reflected in incorrect directions from the polygon mirror corner portions. This prevents these stray beams from reaching unintended areas or devices, ensuring that only the properly directed laser beam forms grooves at the intended positions.
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
Achieves uniform groove processing and depth, reducing optical component damage and contamination, thereby producing high-quality steel sheets with improved iron loss characteristics.
Implementation Method 1
a polygon mirror that reflects the laser beams output from the light source device
Implementation Method 2
a condensing optical system that is provided on an optical path of the laser beams reflected by the polygon mirror and focuses the laser beams
Implementation Method 3
a shielding plate that is provided between the condensing optical system and the object at a position which blocks some of the laser beams focused through the condensing optical system
Data Source
AI summary
A groove processing device that forms a groove in an object's surface using laser beams includes: a light source device that outputs the laser beams; a polygon mirror that reflects the laser beams that are output; a condensing optical system provided on an optical path of the laser beams that are reflected and focuses the laser beams; and a shielding plate provided between the condensing optical system and the object at a position which blocks some of the laser beams and blocks some of the laser beams. Among the laser beams that are focused, some that are not blocked form the groove in the surface of the object at a focus. The shielding plate is provided closer to the condensing optical system than the focus and is rotated with respect to the object's surface to block the laser beams that do not form the groove.