Numerical Controller Machining Time Prediction Using Deviation Correction
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Solution Overview
Problem
Existing numerical controllers fail to accurately predict machining time due to neglect of machine delay, leading to errors in machining time prediction, especially at the early stages of machining.
Innovation Solution
A numerical controller with a function to measure and accumulate deviation time and its occurrence conditions, allowing for the calculation of a correction time to adjust predicted machining times, considering acceleration/deceleration frequencies and actual machining times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional machining time prediction methods are used, then prediction simplicity is maintained, but prediction accuracy deteriorates due to neglect of machine delay
Solution Approach 1:
The system performs preliminary measurement of machine delay during actual machining operations and stores the measured values in advance. When predicting machining time, the pre-measured delay values are retrieved and applied to correct the prediction, eliminating the need for complex real-time delay calculation while improving accuracy.
Solution Approach 2:
The system measures actual machining time, calculates the difference between actual and predicted time to determine machine delay, stores this delay information, and uses it to correct future predictions. This feedback loop continuously improves prediction accuracy by learning from actual machining behavior.
2Productivity
If machining speed is increased to shorten machining time, then productivity improves, but machining accuracy deteriorates
Solution Approach 1:
The system automatically measures machine delay during actual machining and uses this information to self-correct machining time predictions. By accounting for acceleration/deceleration delays and servo control delays through actual measurement rather than theoretical calculation, the system provides accurate predictions that reflect real machining conditions, enabling better optimization of speed-accuracy trade-offs.
Data Source
AI summary
A numerical controller enabling prediction of a machining time considering a machine delay occurring in a machine. The numerical controller configured for predicting a reference machining time corresponding to a machining time not considering acceleration/deceleration of an predicting the number of times of acceleration/deceleration of the axis in machining storing information related to a deviation time corresponding to a difference between an actual machining time corresponding to a machining time required for actual machining by the machine and the reference machining time predicted in the machining, calculating a correction time for correcting the reference machining time based on the number of times of acceleration/deceleration predicted and the information related to the deviation time stored, and calculating a predicted machining time obtained by correcting the reference machining time using the correction time.