Machine Tool Shaft Vibration Limits for Resonance Suppression
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Solution Overview
Problem
Conventional control devices for machine tools that set upper limits on vibration acceleration fail to reliably suppress shaking due to resonance frequencies and inertia differences in control shafts, leading to increased machine tool vibration.
Innovation Solution
A control device that sets vibration conditions including frequency, amplitude, and direction parameters, and restricts these conditions based on upper limit values for vibration frequency, amplitude, velocity, acceleration, and jerk, to effectively suppress machine tool shaking by adjusting these parameters according to the specific characteristics of the machine tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the upper limit value of vibration acceleration is set to reduce vibration, then the surface finish is improved, but the shaking of the entire machine tool increases due to resonance frequency and inertia differences
Solution Approach 1:
The patent applies parameter changes by setting upper limit values for multiple vibration parameters (frequency, amplitude, velocity, acceleration, jerk) instead of solely relying on acceleration limits. This multi-parameter approach allows optimization of surface finish while preventing excessive machine tool shaking by considering resonance frequencies and inertia characteristics.
Solution Approach 2:
The patent implements dynamics by dynamically adjusting vibration parameters based on the specific machine tool characteristics, resonance frequencies, and inertia of control shafts. The control device adapts the vibration conditions in real-time to maintain optimal surface finish while suppressing harmful shaking.
2Object-affected harmful factors
If vibration acceleration is reduced without considering vibration frequency and inertia, then the vibration amplitude decreases, but the shaking of the entire machine tool cannot be reliably suppressed
Solution Approach 1:
The patent changes the approach from single-parameter (acceleration) control to multi-parameter control by setting upper limits for frequency, amplitude, velocity, acceleration, and jerk. This comprehensive parameter control ensures reliable suppression of machine tool shaking while maintaining reduced vibration amplitude.
Solution Approach 2:
The patent implements feedback by continuously monitoring vibration parameters and adjusting the control shaft vibration accordingly. The control device uses feedback from the machine tool's response to optimize the vibration parameters and prevent excessive shaking.
Data Source
AI summary
Provided is a control device for a machine tool that machines a workpiece by vibration-controlling a control shaft, wherein shaking of the machine tool as a whole is reliably suppressed. This control device for a machine tool includes: a vibration condition setting unit that sets a vibration condition including at least one of a frequency parameter comprising a vibration frequency or a vibration frequency multiple, an amplitude parameter comprising a vibration amplitude or a vibration amplitude multiple, and a vibration direction; a vibration upper limit setting unit that sets, in accordance with one or both of the vibration frequency and the vibration direction, an upper limit value of the vibration parameter that is determined by the vibration condition and includes at least one of the vibration frequency, the vibration amplitude, a vibration speed, a vibration acceleration, and a vibration jerk; a vibration condition limiting unit that limits, on the basis of the upper limit value of the vibration parameter, the vibration condition set by the vibration condition setting unit; and a vibration control unit that vibration-controls a control shaft on the basis of the vibration condition limited by the vibration condition limiting unit.