Laser Machining Path Compensation for Workpiece Posture Changes
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Solution Overview
Problem
Existing laser machining systems face limitations in the range of laser irradiation and robot movement, making it difficult to weld or machine certain areas of a workpiece, such as side or rear surfaces, due to restricted irradiation and movable ranges.
Innovation Solution
A laser machining system that includes a laser irradiation device and a workpiece moving device, where the workpiece move controller transmits information about the position and posture of the workpiece to the laser irradiation controller, allowing the laser irradiation device to compensate for its irradiation position, thereby expanding the machinable areas by adjusting the scanning path and speed based on the workpiece's position and posture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the scanner scans a laser beam while the robot moves the scanner, then the workpiece can be welded into an arbitrary shape, but the range of irradiation from the scanner and movable range of the robot are limited, resulting in points where welding is impossible
Solution Approach 1:
Instead of moving the scanner to achieve welding on all surfaces, the invention inverts the approach by moving the workpiece itself under the stationary scanner. This allows the workpiece to be positioned and oriented so that all surfaces including side and rear surfaces can be accessed by the laser beam without expanding the scanner's irradiation range.
Solution Approach 2:
The invention adds the dimension of workpiece movement and positioning to the system. By controlling the workpiece position and posture in addition to scanner scanning, the system achieves coverage of all workpiece surfaces including those previously inaccessible, effectively utilizing spatial dimensions to overcome the scanner's limited irradiation range.
2Adaptability or versatility
If the scanner scans a laser beam while the robot moves the scanner, then arbitrary shape welding is achieved, but side surface or rear surface welding becomes difficult
Solution Approach 1:
The system inverts the traditional approach by making the workpiece movable rather than the scanner. This allows the workpiece to be positioned and oriented optimally for laser irradiation, making side and rear surface welding as easy as top surface welding, thereby improving ease of operation for all surface types.
Solution Approach 2:
The invention introduces dynamic positioning and posture control of the workpiece during the welding process. By dynamically adjusting the workpiece position and orientation based on the scanning progress, the system maintains optimal accessibility for laser irradiation on all surfaces including side and rear surfaces throughout the welding operation.
3Adaptability or versatility
If the robot moves the scanner to weld arbitrary shapes, then shape flexibility is improved, but the movable range of the robot creates limitations
Solution Approach 1:
The invention inverts the movement strategy by keeping the scanner stationary and moving the workpiece instead. This eliminates the need for the robot to extend its movable range, as the workpiece can be positioned within the scanner's fixed irradiation range while still achieving welding on arbitrary shapes through coordinated scanning and positioning.
Solution Approach 2:
The system utilizes the dimensional capability of workpiece positioning and posture control to achieve arbitrary shape welding within the scanner's fixed range. By controlling the workpiece's position and orientation in multiple dimensions, the system achieves shape flexibility without requiring the robot to have an extended movable range.
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 reduces the occurrence of areas on the workpiece where machining is impossible, enabling the welding or machining of previously inaccessible regions like side or rear surfaces by compensating the scanning path and speed of the laser beam.
Implementation Method 1
a laser irradiation device that irradiates a workpiece with a laser beam
Data Source
AI summary
A laser machining system includes: a laser irradiation device that irradiates a workpiece with a laser beam; a workpiece moving device that moves the workpiece; a laser irradiation controller that controls the laser irradiation device to control an irradiation position of the laser beam; and a workpiece move controller that controls the workpiece moving device to control at least one of the position and the posture of the workpiece. The workpiece move controller transmits information about at least one of the position and the posture of the workpiece to the laser irradiation controller. The laser irradiation controller compensates for the irradiation position of the laser beam based on the information received from the workpiece move controller.