Numerical Controller Chattering Suppression via Periodic Cutting Variation
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Solution Overview
Problem
Existing numerical controllers for machine tools face challenges in suppressing chattering during thread cutting, as they often rely on detectors, spindle motors, or tools, which limits their effectiveness and applicability.
Innovation Solution
A numerical controller that adjusts the cutting amount periodically to suppress chattering by changing the cutting amount during thread cutting, allowing the tool to move with acceleration along the rotation axis, without relying on detectors or spindle motors, and by performing thread cutting with a varied cutting amount to prevent phase errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If spindle speed is changed during thread cutting to suppress chattering, then chattering is suppressed, but phase error occurs between spindle position and feed axis position
Solution Approach 1:
The patent applies periodic action by periodically changing the cutting amount during thread cutting operations. The cutting amount is varied in a periodic manner to suppress chattering while maintaining synchronization between the spindle and feed axis, thereby avoiding phase errors. This is achieved through the control unit that periodically adjusts the cutting depth based on the thread cutting parameters and detected chattering conditions.
2Manufacturing precision
If a detector or spindle motor is used to change spindle speed without phase error, then phase error is eliminated, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the need for additional detectors or specialized spindle motors by implementing chattering suppression through cutting amount variation controlled by the numerical controller. The solution removes the dependency on extra hardware components by using the existing control system to periodically adjust cutting parameters, thereby reducing device complexity while maintaining phase error control.
Solution Approach 2:
The patent replaces the mechanical approach of changing spindle speed (which requires detectors and specialized motors) with a control-based approach that varies the cutting amount. This substitution uses the numerical controller's software logic to achieve chattering suppression without phase error, eliminating the need for complex mechanical sensing and speed adjustment mechanisms.
3Object-affected harmful factors
If cutting amount is changed to suppress chattering, then chattering is suppressed, but tool path complexity increases
Solution Approach 1:
The patent implements self-service by enabling the numerical controller to automatically detect chattering conditions and autonomously adjust the cutting amount without external intervention. The control unit monitors the thread cutting process, detects chattering based on predefined criteria, and automatically varies the cutting depth to suppress vibrations, thereby simplifying the overall system while managing tool path complexity through intelligent automation.
Data Source
AI summary
A numerical controller is configured to move a tool in synchronism with rotation of a workpiece, thereby controlling a machine tool configured to perform thread cutting, and comprises a cutting amount variation setting unit for previously setting the size of a variation of a cutting amount during the thread cutting. The cutting amount variation setting unit periodically changes the cutting amount based on a preset variation during the thread cutting.