Active Vibration Damping for Machine Tools Without CNC Integration
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Solution Overview
Problem
Existing machine tools face challenges in effectively damping vibrations, particularly at the Tool Center Point, which can lead to increased tool wear, inaccurate processing, and high noise levels, and current solutions often rely on CNC controllers for regulation.
Innovation Solution
A self-sufficient vibration damping system comprising an active vibration damper and vibration sensors that detect vibrations at two points, with the damper controlling forces based on the difference between these detections, allowing for independent operation without a CNC controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an active vibration damper is used to damp vibrations at the Tool Center Point, then vibration damping effectiveness is improved, but the system complexity increases due to reliance on CNC controller integration
Solution Approach 1:
The vibration damping system is designed to be self-sufficient by using local vibration sensors to detect vibrations and a local controller to generate control signals for the active vibration damper, eliminating the need for CNC controller integration and making the system independent and easier to implement
Solution Approach 2:
The vibration damping system is segmented into independent components: vibration sensors mounted on the machine element, a local controller, and the active vibration damper. This segmentation allows the system to operate independently without relying on the central CNC controller, reducing system complexity while maintaining effectiveness
2Reliability
If vibration damping is implemented using existing solutions, then vibration control is achieved, but productivity is reduced due to increased jerk into the drives
Solution Approach 1:
The active vibration damper dynamically adjusts the counteracting force in real-time based on vibration signals from the sensors, allowing effective vibration damping without the need for excessive jerk compensation, thus maintaining high productivity while controlling vibrations
3Measurement precision
If vibration sensors are placed at the Tool Center Point to detect vibrations, then measurement accuracy is improved, but the system becomes dependent on CNC controller information
Solution Approach 1:
Vibration sensors are mounted directly on the machine element (spindle or tool holder) to detect vibrations locally at the source, providing accurate measurement while enabling the system to operate independently without CNC controller information
Solution Approach 2:
A local controller acts as an intermediary between the vibration sensors and the active vibration damper, processing the vibration signals and generating control signals locally, thereby eliminating the need for CNC controller integration while maintaining measurement accuracy
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
This solution effectively dampens vibrations at the Tool Center Point, reducing tool wear and noise, and increases productivity by smoothing drive jerks, without relying on CNC controller information, making it adaptable to various machine tool processes.
Implementation Method 1
an active vibration damper arranged on a region of the machine tool for damping a vibration of the machine element
Implementation Method 2
a vibration sensor facility arranged to detect the vibration of the machine element at a first point and at a second point
Data Source
AI summary
A machine tool includes a machine element, an active vibration damper arranged on a region of the machine tool for damping a vibration of the machine element, and a vibration sensor facility arranged to detect the vibration of the machine element at a first point and at a second point of the machine tool, with the vibration of the machine element to be detected being smaller at the second point than at the first point. The active vibration damper is designed to damp the vibration of the machine element as a function of a variation between a first actual value detected by the vibration sensor facility at the first point and a second actual value detected by the vibration sensor facility at the second point.