Machine Tool Chatter Control Using Spindle Vibration Order
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Solution Overview
Problem
Existing machine tools lack intuitive guidance on adjusting spindle rotation speed and workpiece width to effectively suppress chatter vibrations, leading to decreased precision in cutting operations.
Innovation Solution
A machine tool system that includes a display, a spindle, a sensor, and a processor to detect chatter vibrations, calculate the order of vibrations based on spindle rotation speed and cutting edges, and present order information to assist users in adjusting control parameters to minimize chatter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the machine tool presents only the relation between spindle rotation speed and acceleration of chatter vibration, then the information about chatter vibration is provided, but the user cannot intuitively understand how to adjust control parameters
Solution Approach 1:
The patent introduces an 'order' value as an intermediary parameter that bridges the gap between raw vibration data and actionable control parameters. The order value serves as a mediator that translates complex vibration characteristics into an intuitive metric that directly guides parameter adjustment, making the system both informative and easy to operate simultaneously
Solution Approach 2:
The patent transforms the presentation from raw acceleration data to a derived parameter 'order' that changes based on vibration frequency, spindle speed, and number of cutting edges. This parameter transformation makes the information both complete and intuitively actionable, resolving the contradiction between information completeness and ease of operation
2Measurement precision
If the machine tool provides detailed vibration data without processing, then measurement precision is maintained, but the user cannot easily determine adjustment directions
Solution Approach 1:
The patent implements a feedback mechanism where the calculated 'order' value provides direct guidance on how to adjust control parameters. The order value feedback loop translates precise vibration measurements into actionable insights, maintaining measurement precision while enabling easy parameter adjustment through intuitive feedback
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides users with intuitive order information to adjust spindle rotation speed and workpiece width, effectively suppressing chatter vibrations and improving cutting precision.
Implementation Method 1
a sensor configured to detect a vibration frequency of the spindle or the tool
Data Source
AI summary
A machine tool includes: a display; a tool configured to machine a workpiece; a spindle configured to rotate the tool or the workpiece; a sensor configured to detect a vibration frequency of the spindle or the tool; and a processor configured to control the machine tool. The processor is configured to: detect a chatter vibration in the spindle or the tool based on the vibration frequency; based on a frequency of the chatter vibration, a rotation speed of the spindle, and the number of cutting edges of the tool, calculate an order corresponding to the number of vibrations of the tool during a period of time until a current rotation angle of a first cutting edge of the tool reaches a current rotation angle of a second cutting edge of the tool; and present order information on the display, the order information indicating a magnitude of the calculated order.