Machine Tool Balance Control Using Rotational State Comparison
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Solution Overview
Problem
Machine tools face challenges in maintaining rotational balance due to deviations in the center of gravity of workpieces from the axial center of rotating bodies, leading to vibrations and phase biases, which affect machining accuracy.
Innovation Solution
A control device that acquires and compares physical quantities indicating the rotational state of a rotating body, adjusts the balance by moving an adjusting tool, and outputs results to determine the appropriateness of balance adjustments, ensuring precise machining by monitoring and adjusting the rotational balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the center of gravity of the workpiece is disposed at the axial center direction of the rotating body, then vibration and phase bias are suppressed, but the center of gravity of the actual workpiece often deviates from the axial center direction, affecting machining accuracy
Solution Approach 1:
The control device acquires physical quantities indicating the rotational state of the rotating body, compares multiple physical quantities with different acquisition times to determine changes in rotational state, and outputs the comparison results. This feedback mechanism enables continuous monitoring and adjustment of rotational balance to maintain machining accuracy despite workpiece center of gravity deviations.
Solution Approach 2:
The system automatically detects and determines changes in rotational state through the control device's comparison of physical quantities acquired at different times. The adjusting tool on the rotating body self-adjusts the balance based on the determined changes, reducing the need for external intervention and maintaining operational reliability.
2Manufacturing precision
If balance adjustment is performed after machining using a program, then the workpiece can be adjusted based on imbalance, but the complexity of the control system increases
Solution Approach 1:
The control device implements a feedback mechanism by acquiring physical quantities indicating rotational state, comparing them across different time points, and determining changes in rotational state. This automated feedback loop simplifies the control process by systematically managing balance adjustment based on actual measured changes rather than requiring complex pre-programmed adjustments.
Solution Approach 2:
The system determines changes in rotational state by comparing physical quantities acquired at different times, enabling balance adjustment to be performed proactively based on detected changes rather than waiting for post-machining imbalance detection. This preliminary action approach streamlines the control process.
Data Source
AI summary
A control device is configured to control operation of a drive unit and monitor a rotational balance of a rotating body, for a machine tool including the rotating body that is rotatable around a predetermined axial center in a state of fixing a workpiece and on which an adjusting tool that can adjust the rotational balance is arrangeable, and the drive unit that rotates the rotating body, and the control device includes: a physical quantity acquiring unit configured to acquire at least one physical quantity indicating a rotational state of the rotating body, the physical quantity being changed in response to an adjustment of the rotational balance; a comparing unit configured to compare a plurality of physical quantities having different acquisition times; and an output unit configured to output a comparison result.