Numerical Control Signal Correction for 3D Vibration Suppression
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Solution Overview
Problem
Existing machine tools experience vibrations in structures other than the workpiece due to drive forces, leading to degraded machining accuracy and surface quality, as previous techniques only suppress vibrations caused by movement and rotation of movable members, failing to address relative vibrations between tools and workpieces.
Innovation Solution
A numerical control device with estimation units to calculate movement amounts of both driven and undriven objects, using drive signals to generate correction signals that account for vibrations in three-dimensional space, thereby suppressing vibrations in structures other than the workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control is executed on the drive shaft to suppress deviation in the movement direction, then positioning accuracy is improved, but vibrations in directions different from the movement direction cannot be suppressed
Solution Approach 1:
The invention extends vibration suppression from one-dimensional (movement direction only) to three-dimensional space by estimating movement amounts in all three axes (X, Y, Z) and applying correction signals that account for vibrations in directions perpendicular to the drive shaft's movement direction, thereby suppressing vibrations in all spatial dimensions
2Productivity
If drive force is transmitted to move the workpiece, then productivity is improved, but relative vibrations between tool and workpiece occur due to reactive forces
Solution Approach 1:
The invention performs preliminary estimation of the movement amount of the workpiece (second object) that will be generated by the drive force before the actual machining operation, and pre-calculates correction signals to counteract the resulting vibrations, thereby preventing relative vibrations between tool and workpiece before they occur
Solution Approach 2:
The invention implements a feedback mechanism where the estimated movement amount of the workpiece is fed back to the correction-amount calculation unit, which then generates correction signals that are applied to the drive signal, creating a closed-loop control system that continuously compensates for vibrations caused by workpiece movement
Data Source
AI summary
A numerical control device includes a drive-shaft movement-amount estimation unit to estimate a first movement amount of a first object that is a target to be moved by a first drive shaft by using a first drive signal, an undriven-object movement-amount estimation unit to estimate a second movement amount of a second object in a three dimensional space, which is generated due to a drive force of the first drive shaft, by using the first drive signal, a correction-amount calculation unit to calculate a correction amount for the first drive signal on the basis of the first movement amount and the second movement amount, and a first correction-signal output unit to output a first corrected drive signal obtained by correcting the first drive signal by the correction amount to a drive unit to drive the first drive shaft.