Machine Tool Vibration Damping for Cutting Force Estimation
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Solution Overview
Problem
Existing vibration damping systems for machine tools are ineffective in fundamentally reducing the repulsive torque and torque generated during machining, leading to reduced precision and productivity due to unaddressed vibrations.
Innovation Solution
A vibration damping system comprising a housing with a stator and rotor, expanders, and compressors that apply attractive and repulsive forces to dissipate repulsive torque, along with a controller to estimate and adjust the cutting force for constant machining conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vibration damping is achieved by changing machining conditions, then some vibrations are reduced, but the fundamental magnitude of repulsive force and torque cannot be reduced
Solution Approach 1:
The patent converts the harmful repulsive torque generated during machining into a beneficial force by using it to drive a vibration damping mechanism. The repulsive torque from the motor is transmitted to a stator, which interacts with compressors and expanders to generate damping forces that counteract vibrations in the machine tool structure, thereby transforming the harmful vibration source into a useful damping mechanism.
Solution Approach 2:
The patent introduces a vibration damping mechanism as an intermediary between the motor and the machine tool structure. This intermediary system, comprising a stator, compressors, and expanders, absorbs and dissipates the repulsive torque before it can cause harmful vibrations, thereby protecting the structural integrity and precision of the machine tool.
2Power
If repulsive torque is transmitted to the machine tool structure, then machining force is generated, but vibrations reduce usage efficiency and precision
Solution Approach 1:
The patent segments the torque transmission path by separating the repulsive torque generation from the structural load. The repulsive torque is directed to drive the stator in the vibration damping mechanism, which independently handles vibration damping, while the machine tool structure is protected from these harmful vibrations, allowing cutting force to be maintained without compromising precision.
3Loss of energy
If vibrations occur during machining, then energy is consumed, but fundamental reduction of repulsive force magnitude is not achieved
Solution Approach 1:
The patent merges the vibration damping function with the existing motor torque transmission system. The repulsive torque that would otherwise be wasted or cause vibrations is instead utilized to drive the stator and activate the compression/expansion mechanism, combining the motor's operational byproduct with the damping function in a unified system.
Solution Approach 2:
The patent changes the physical state and parameters of the damping mechanism by utilizing compression and expansion of elastic elements. The compressors and expanders change their physical state in response to the stator's rotation, creating variable damping forces that adapt to the machining conditions and effectively reduce vibrations without requiring complex active control systems.
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 effectively dampens vibrations by estimating the cutting force and adjusting compressor forces, improving machining accuracy and productivity by preventing repulsive torque transmission to the machine tool structure.
Implementation Method 1
a rotor of which at least a part is positioned in the space inside the stator, having an axis of rotation at a center, the axis of rotation matching a center of rotation of the stator, and rotating around the axis of rotation by an electromagnetic force
Implementation Method 2
a first expander having a front end connected to an outer surface of the stator and a rear end connected to the housing and applying an attractive force that pulls the stator when the stator rotates
Implementation Method 3
a second expander having a front end connected to the outer surface of the stator and a rear end connected to the housing, positioned at a location symmetric to the location of the first expander with respect to the axis of rotation, and applying an attractive force that pulls the stator in an opposite direction to the attractive force by the first expander when the stator rotates
Implementation Method 4
a first compressor having a front end connected to the outer surface of the stator and a rear end connected to the housing and applying a repulsive force that pushes the stator using an elastic force of a spring
Implementation Method 5
a second compressor having a front end connected to the outer surface of the stator and a rear end connected to the housing, positioned at a location symmetric to the location of the first compressor with respect to the axis of rotation, and applying a repulsive force that pushes the stator using an elastic force of a spring
Data Source
AI summary
The present disclosure relates to a vibration damping system and a method for estimating a cutting force of a machine tool using the same, and according to the present disclosure, disclosed is technology including a housing; a stator rotatably positioned at an arbitrary angle in an internal space of the housing; a rotor positioned in a space inside the stator and rotating around an axis of rotation; a spindle rotating with the rotor; a first expander applying an attractive force that pulls the stator when the stator rotates; a second expander applying an attractive force in an opposite direction to the attractive force of the first expander; a first compressor applying a repulsive force that pushes the stator; and a second compressor; to suppress the generation of vibrations of the machine tool, thereby improving machining quality and machining accuracy of a structure.