Numerical Control Device Mid-Processing Path Recalculation
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Solution Overview
Problem
Numerical control devices face inefficiencies when a finishing shape needs to be changed mid-processing, leading to unnecessary interference between the tool and workpiece, resulting in increased processing time as the tool must restart from the beginning.
Innovation Solution
A numerical control device with an initial locus deriving unit, processed range acquiring unit, and changed locus deriving unit that calculates a new processing path by excluding the processed area from the changed finishing shape, allowing the tool to resume processing from the interruption point without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tool restarts processing from the beginning when the finishing shape is changed mid-processing, then interference between the tool and workpiece is avoided, but processing time increases unnecessarily
Solution Approach 1:
The processing path is segmented into already-processed portions and unprocessed portions. The system identifies and excludes the already-processed range from the new finishing shape calculation, allowing the tool to resume processing from the interruption point rather than restarting from the beginning, thus avoiding unnecessary processing time while maintaining interference avoidance through proper path recalculation
Solution Approach 2:
The system performs preliminary calculation of the changed processing path before the tool resumes processing. By pre-calculating the new finishing shape and determining the exact resumption point based on the processed range, the system prepares the optimal path in advance, enabling the tool to continue from the interruption point without interference while minimizing processing time
2Adaptability or versatility
If the finishing shape is changed mid-processing, then adaptability to design changes is improved, but tool-workpiece interference occurs if processing resumes from the interruption point
Solution Approach 1:
The processing path is made dynamic by recalculating it based on the changed finishing shape while considering the already-processed range. The system dynamically adjusts the processing path to accommodate design changes mid-processing, excluding the processed portion from the new shape calculation to prevent tool-workpiece interference during resumption
Solution Approach 2:
The processed range information acts as an intermediary between the original processing state and the changed finishing shape. By using this intermediary data to exclude already-processed areas from the new finishing shape calculation, the system enables adaptability to design changes while preventing tool-workpiece interference through proper path recalculation
3Manufacturing precision
If the tool processes already-processed areas when resuming from the interruption point, then complete coverage of the new finishing shape is ensured, but processing time increases
Solution Approach 1:
The system extracts and excludes the already-processed range from the changed finishing shape calculation. By removing the processed portion from the new path calculation, the tool only processes the unprocessed areas needed to achieve the changed finishing shape, ensuring completeness while avoiding unnecessary reprocessing of already-finished areas
Solution Approach 2:
Instead of processing the entire new finishing shape from the beginning, the system applies partial action by processing only the unprocessed portion. This partial processing approach, determined by excluding the processed range from the changed finishing shape, ensures the necessary areas are covered while minimizing processing time by avoiding redundant operations on already-processed areas
Data Source
AI summary
A numerical control device that controls servomotors configured to process a workpiece into an arbitrary finishing shape by performing a plurality of processing operations so that the tool moves along a processing locus, the numeral control device includes: an initial locus deriving unit configured to derive the processing locus based on the arbitrary finishing shape; a processed range acquiring unit configured to acquire a processed range in which the tool has performed the processing operation; a receiving unit configured to receive a processing instruction for a changed finishing shape different from the arbitrary finishing shape; and a changed locus deriving unit configured to derive a changed processing locus based on a shape of a changed processed part obtained by excluding the processed range from the changed finishing shape at the time of interruption of the processing.