CNC Vibration Control Avoiding Mechanical Resonance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing numerical control devices for machining face issues with mechanical resonance when low-frequency vibration is applied, as it can cause oscillations if the vibration frequency aligns with mechanical resonance frequencies, necessitating a method to automatically select optimal vibration conditions.
Innovation Solution
A numerical control device that includes a storage unit for holding invalid frequency regions and a vibration condition determining unit to calculate vibration frequencies based on the main shaft's rotational speed and number of vibrations per rotation, ensuring frequencies are set outside resonance and anti-resonance bands to prevent mechanical resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If low frequency vibration is applied to the cutting tool to improve machining performance, then cutting efficiency is improved, but mechanical resonance may occur causing oscillation
Solution Approach 1:
The system performs preliminary measurement to detect the mechanical resonance frequency of the cutting tool before actual vibration cutting begins. This advance detection allows the control mechanism to pre-determine safe vibration frequencies that avoid resonance, preventing oscillation before it occurs during machining operations
Solution Approach 2:
The system incorporates a feedback mechanism where the measured resonance frequency information is fed back to the control mechanism. The control mechanism uses this feedback to automatically adjust and select vibration frequencies that avoid the detected resonance bands, ensuring stable operation while maintaining high cutting efficiency
2Reliability
If vibration frequency is manually set to avoid resonance, then mechanical stability is maintained, but automation and efficiency are reduced
Solution Approach 1:
The system enables self-service operation where the control mechanism automatically performs resonance frequency detection and autonomously determines optimal vibration frequencies without requiring manual intervention. The system serves itself by measuring its own mechanical characteristics and adjusting parameters accordingly, thereby maintaining both stability and automation
Solution Approach 2:
The control mechanism automatically changes the vibration frequency parameter based on measured resonance characteristics. By dynamically adjusting this critical parameter, the system achieves full automation in frequency selection, eliminating manual setting while ensuring mechanical stability through resonance avoidance
Data Source
AI summary
A numerical control device is for machining a machining object by moving a tool and the machining object relative to each other along a movement path while applying vibration, by use of a drive axis provided for the tool or the machining object. The device includes a storage unit that holds an invalid frequency region, and a vibration condition determining unit to determine a frequency for the vibration, based on a rotational speed of a main shaft for rotating the machining object, a number of vibrations of the vibration in each one rotation of the main shaft, and the invalid frequency region.