Machine Tool NC Control for Machining Defect Cause Diagnosis
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Solution Overview
Problem
Existing numerical control systems for machine tools are unable to effectively identify and address the main cause of machining defects such as chatter vibrations, tool deflections, and friction in feed drive mechanisms, often leading to reduced productivity and machining accuracy.
Innovation Solution
A numerical control system that includes a detection unit for cutting forces, a control unit for the feed drive mechanism, dynamic-characteristics-information storage, machining-process-information storage, a countermeasure determination unit to calculate deviation degrees for possible causes of machining defects, and a correction-amount calculation unit to output correction amounts to the control unit based on the identified cause.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple possible causes of machining defects are considered and deviation degrees are calculated for each, then the accuracy of identifying the main cause is improved, but the computational complexity and processing time increase
Solution Approach 1:
The countermeasure determination unit divides the identification process into separate evaluation paths for different defect causes (chatter vibration, tool deflection, tool wear, friction). Each cause is evaluated independently by calculating its specific deviation degree, allowing parallel processing and reducing overall computational complexity while maintaining high identification accuracy.
2Manufacturing precision
If real-time monitoring and analysis of machining defects are implemented, then machining accuracy is improved, but the processing time and productivity are reduced
Solution Approach 1:
The system pre-calculates and stores deviation degree calculation formulas and threshold values for different defect causes before machining begins. During real-time operation, the control unit only needs to input current machining parameters and automatically retrieves the pre-prepared evaluation criteria, significantly reducing processing time while maintaining accurate real-time defect identification.
Solution Approach 2:
The system replaces complex mechanical analysis and manual defect diagnosis with automated computational algorithms. The control unit automatically calculates deviation degrees and identifies defect causes based on measured machining parameters, eliminating time-consuming manual intervention while providing rapid, accurate defect detection and enabling immediate corrective actions.
3Reliability
If the system calculates and compares deviation degrees for multiple defect causes, then the reliability of defect diagnosis is improved, but the device complexity increases
Solution Approach 1:
The countermeasure determination unit is designed as a universal multi-functional module that can evaluate multiple types of machining defects (chatter vibration, tool deflection, tool wear, friction) using a unified deviation degree calculation framework. This single unit performs diverse diagnostic functions through parameter configuration rather than requiring separate dedicated systems for each defect type, reducing overall system complexity while maintaining high diagnostic reliability.
Data Source
AI summary
The numerical control system includes: detecting circuitry to obtain cutting force generated in a machine tool; controlling circuitry to calculate a control amount according to a cutting condition and to control a feed drive mechanism of the machine tool; countermeasure determining circuitry to, when it is detected from the cutting force or a state of the feed drive mechanism of the machine tool that a machining defect has occurred, calculate a plurality of deviation degrees for possible causes of the machining defect, and compare the calculated deviation degrees and to thereby determine a cause of the machining defect whose occurrence has been detected; and correction-amount calculating circuitry to calculate, according to the cause of the machining defect determined by the countermeasure determining circuitry, a correction amount with respect to the control amount, and then output the correction amount to the controlling circuitry.