Tool Path Correction Using Added Command Points for Curved Surfaces
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Solution Overview
Problem
Existing tool path correction devices fail to accurately machine workpieces with curved surfaces due to separation or encroachment of the tool from the target shape, leading to errors in the machined workpiece.
Innovation Solution
A tool path correction device that adds additional command points near feature change points on the target shape and rearranges command points to ensure the tool follows the target shape accurately, using a tool path acquisition, tool shape acquisition, and target shape acquisition units to identify and correct the tool path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a tool moves along a tool path composed of a plurality of command points and straight lines connecting the command points, then the tool path can be simply defined and executed, but the tool separates from the target shape or encroaches on the inside of the target shape between the command points, resulting in machining errors
Solution Approach 1:
The tool path is segmented into multiple sections by dividing it at feature change points of the target shape. Each section is processed independently with appropriate command points added at feature change points, allowing the tool path to accurately follow complex curved surfaces while maintaining manageable segment lengths for precise control
Solution Approach 2:
Feature change points are identified and additional command points are added in advance before tool path execution. This preliminary adjustment ensures that the tool path is pre-corrected to account for the three-dimensional shape of the tool, preventing separation or encroachment errors during actual machining operations
2Productivity
If command points are sparsely distributed along the tool path, then the tool path data size is reduced and processing is faster, but the tool separates from the target shape between command points, causing machining errors
Solution Approach 1:
Command points are distributed non-uniformly along the tool path, with higher density at feature change points where the target shape has significant geometric changes. This local refinement ensures high machining accuracy at critical locations while maintaining lower command point density in regular sections, balancing precision and processing efficiency
3Manufacturing precision
If the tool path is corrected to account for the three-dimensional shape of the tool, then machining accuracy is improved, but the complexity of the tool path correction device and process increases
Solution Approach 1:
The system uses target shape information from CAD data as a digital copy of the desired workpiece geometry. This digital model is processed to identify feature change points and generate corrected tool paths, eliminating the need for physical trial-and-error machining and complex physical correction mechanisms
Data Source
AI summary
Provided is a tool path correction device which makes it possible to correct a tool path along which a tool moves so as to make it possible to accurately machine a workpiece into a target shape. A tool path correction device according to one aspect of the present disclosure is equipped with: a tool path acquisition unit which acquires tool path information which specifies, using a plurality of command points through which a tool should pass, a tool path along which said tool, which machines a workpiece, moves; a tool shape acquisition unit for acquiring tool shape information which specifies the shape of said tool; a target shape acquisition unit for acquiring target shape information, which specifies the target shape after the workpiece is machined; and a command point addition unit for adding an additional command point as a new command point in a location near a characteristic change point where the characteristics of the target shape change.