Machine Tool Controller Using Random Spindle Speed Shifts Against Chatter
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Solution Overview
Problem
Conventional machine tools require skilled intervention to detect and mitigate chatter vibrations, which complicates the cutting process and can lead to inefficiencies and inaccuracies.
Innovation Solution
A controller for machine tools that includes determination, setting, and control means to automatically detect chatter vibrations and adjust the spindle's rotational speed within predetermined limits to eliminate or minimize these vibrations, using a random change amount to find a stable operational speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If skilled intervention is used to detect and mitigate chatter vibrations, then chatter vibrations can be detected and addressed, but the cutting process becomes complicated and efficiency decreases
Solution Approach 1:
The machine tool system performs self-diagnosis and self-adjustment by automatically detecting chatter vibrations through monitoring means and adjusting spindle speed through control means, eliminating the need for skilled operator intervention and maintaining high cutting efficiency
Solution Approach 2:
The system implements a closed-loop feedback mechanism where vibration detection results are continuously monitored and used to automatically adjust spindle speed, creating a self-regulating system that maintains stable cutting conditions without human intervention
2Measurement precision
If skilled intervention is required to mitigate chatter vibrations, then accurate judgment can be made, but the cutting process becomes complicated and accuracy may decrease
Solution Approach 1:
The system replaces the mechanical judgment process of skilled operators with automated monitoring means that objectively detect and measure chatter vibrations, eliminating subjectivity and complexity while maintaining high detection accuracy
Solution Approach 2:
The control system automatically processes vibration data and executes speed adjustments without requiring skilled operator judgment, simplifying the cutting process while maintaining accurate chatter vibration mitigation
3Stability of the object's composition
If fixed spindle speed is maintained during cutting, then cutting parameters remain stable, but chatter vibrations cannot be effectively mitigated
Solution Approach 1:
The system transitions from fixed spindle speed to dynamic speed adjustment, where the spindle speed is continuously modified based on real-time vibration detection to maintain stable cutting conditions and eliminate chatter vibrations
Solution Approach 2:
The control means changes the spindle speed parameter in response to detected chatter vibrations, adjusting the cutting conditions dynamically to mitigate vibrations while maintaining overall cutting stability
Data Source
AI summary
A controller includes a determination circuit, a setting circuit, and a control circuit. The determination circuit is configured to determine whether a chatter vibration is occurring while a spindle is rotating and a workpiece is being cut. The setting circuit is configured to set an upper limit and a lower limit on a change amount of a rotational speed of the spindle. The control circuit is configured to determine the change amount randomly from a range between the upper limit and the lower limit and configured to rotate the spindle at a second rotational speed obtained by changing a first rotational speed by the change amount that has been determined if the chatter vibration is determined as occurring while the control circuit controls the rotational speed of the spindle at the first rotational speed.