Numerical Control Device Vibration Suppression Compensation
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Solution Overview
Problem
Existing numerical control devices for machine tools do not effectively consider the amount of cut and spindle motor efficiency when suppressing chatter vibration, leading to decreased machining efficiency and increased spindle motor loss and heat generation.
Innovation Solution
A numerical control device and method that include a machining control unit, vibration acquisition unit, state acquisition unit, compensation plan calculating unit, and display control unit to stop machining when chatter vibration occurs, calculate compensation plans based on spindle motor state data, and display these plans to assist operators in adjusting machining conditions to suppress vibration while considering efficiency and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the spindle rotational speed is changed to suppress chatter vibration, then vibration suppression is improved, but machining efficiency decreases and spindle motor loss increases
Solution Approach 1:
The system calculates multiple compensation plans that modify spindle motor parameters (rotational speed, torque, power) to suppress chatter vibration while considering machining efficiency. The compensation plans adjust these parameters based on detected vibration to find optimal operating points that balance vibration suppression with maintaining productive machining conditions.
Solution Approach 2:
The system continuously monitors vibration during machining and uses this feedback to calculate appropriate compensation plans. When chatter vibration is detected, the system provides real-time guidance for adjusting machining conditions, creating a closed-loop control system that adapts to actual machining conditions rather than relying on fixed parameter changes.
2Stability of the object's composition
If the spindle rotational speed is changed to suppress chatter vibration, then vibration suppression is improved, but the amount of heat generation increases
Solution Approach 1:
The compensation plans calculate optimal spindle motor operating parameters including rotational speed and torque that suppress chatter vibration while minimizing heat generation. By finding the right parameter combination rather than simply changing speed, the system reduces unnecessary energy conversion to heat while maintaining vibration suppression effectiveness.
3Stability of the object's composition
If the spindle rotational speed is changed to suppress chatter vibration, then vibration suppression is improved, but it becomes difficult to find optimal machining conditions considering multiple factors
Solution Approach 1:
The system automatically calculates multiple compensation plans based on detected vibration and current machining conditions, providing the operator with ready-made solutions. This eliminates the need for operators to manually analyze complex relationships between multiple parameters and find optimal settings, as the system performs this analysis and presents actionable compensation plans.
Solution Approach 2:
The system continuously monitors vibration and provides real-time feedback with calculated compensation plans, enabling operators to make informed decisions about machining condition adjustments. This feedback loop transforms a complex optimization problem into a straightforward process of selecting from pre-calculated solutions based on actual machining conditions.
Data Source
AI summary
A numerical control method at least controls a spindle motor of a machine tool so as to perform machining in accordance with machining conditions. In the method, vibration occurring in a tool is acquired with a vibration acquisition unit, and the machining on a workpiece performed by a machining control unit is stopped when vibration having a predetermined amplitude or greater occurs in the tool. Based on state data indicating the state of the spindle motor at that time, multiple compensation plans for compensating the state of the spindle motor in order to suppress vibration occurring in the tool are calculated. The thus calculated multiple compensation plans are displayed on a display unit together with the state of the spindle motor at the time of occurrence of vibration having the predetermined amplitude or greater in the tool.