Rotary Shaft Speed Fluctuation Monitoring for Chatter Suppression
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Solution Overview
Problem
Existing methods for suppressing chatter vibration in machine tools by fluctuating the rotation speed of rotary shafts are difficult for unskilled operators to implement effectively, as they require precise setting of fluctuation amplitude and period, and can exceed motor power limits, leading to ineffective or unrealizable fluctuations.
Innovation Solution
A method and apparatus for monitoring and displaying rotation speed fluctuation diagrams, including a power limit line, to allow operators to easily select optimal fluctuation parameters and avoid motor overload, enabling effective chatter vibration suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rotation speed fluctuation amplitude and period are set to suppress chatter vibration, then chatter vibration suppression effect is improved, but operator skill requirement increases and ease of operation deteriorates
Solution Approach 1:
The system automatically calculates and determines the optimal fluctuation parameters (amplitude and period) based on detected chatter vibration characteristics, eliminating the need for operators to manually set these parameters. The rotation speed fluctuation control unit self-adjusts the parameters to suppress chatter vibration effectively.
Solution Approach 2:
The system continuously monitors vibration during cutting operations and uses this feedback to dynamically adjust the rotation speed fluctuation parameters. The vibration detection unit provides real-time data that is used to optimize the fluctuation amplitude and period for chatter suppression.
2Manufacturing precision
If large fluctuation amplitude and short fluctuation period are used to increase fluctuation rate, then chatter vibration suppression is improved, but motor power limit is exceeded and reliability deteriorates
Solution Approach 1:
The system dynamically adjusts the fluctuation parameters based on real-time motor load conditions. When approaching power limits, the system automatically modifies the fluctuation amplitude and period to maintain chatter suppression effectiveness while staying within motor capabilities.
Solution Approach 2:
The system changes the fluctuation parameters (amplitude and period) as operating conditions change, particularly adapting to motor power constraints. Multiple parameter sets are available and selected based on current cutting conditions and motor capacity.
3Manufacturing precision
If rotation speed fluctuation is implemented to suppress chatter vibration, then surface precision is improved, but device complexity increases due to additional control parameters
Solution Approach 1:
The system combines multiple functions into integrated units: the rotation speed fluctuation control unit handles parameter calculation, command generation, and execution; the vibration detection unit integrates sensing and analysis; the power calculation unit combines motor data processing with fluctuation parameter adjustment.
Solution Approach 2:
The control system automatically manages the complexity by self-calculating optimal parameters and self-adjusting operation modes, reducing the apparent complexity for the operator while maintaining sophisticated control capabilities.
Data Source
AI summary
In suppressing chatter vibration of a rotary shaft in a machine tool by fluctuating rotation speed of the rotary shaft, easy setting of a fluctuation parameter is realized. In a monitor apparatus of the machine tool, a graph showing a fluctuation amplitude of the rotation speed is displayed. On this graph, a current fluctuation position (first point) is indicated by a black circle marker, and also, a power limit line L of a motor fluctuation period is depicted based on a predetermined equation. In an area not exceeding the power limit line L, a new fluctuation position (second point) having a larger fluctuation amplitude and a shorter fluctuation period than the current fluctuation position is calculated and indicated with an arrow A guiding this new point from the current fluctuation position.