Spindle Vibration Measurement Using Moving Mechanism Position Data
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Solution Overview
Problem
Current spindle vibration measurement techniques in machining devices are inadequate for high-precision applications, as they fail to accurately assess spindle vibrations across varying rotation speeds, leading to potential machining defects and suboptimal machining conditions.
Innovation Solution
A spindle vibration measuring system that includes a data acquisition unit to collect positional variation or vibration data during spindle rotation and a processing unit to derive and output results related to spindle vibrations, allowing for the identification of optimal and defective rotation speed ranges, thereby improving machining precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional spindle vibration measurement techniques are used, then the measurement process is simple, but the measurement precision is insufficient for high-precision machining applications
Solution Approach 1:
The patent combines the spindle vibration measurement function with the existing moving mechanism's position detection system. The encoder that normally detects position for control purposes is utilized to also detect vibrations by analyzing positional variations during spindle rotation, merging two functions into one existing component.
Solution Approach 2:
The system uses the moving mechanism's own position detection capability to measure spindle vibrations without requiring external vibration sensors. The encoder serves dual purposes: normal position feedback and vibration detection, allowing the system to self-diagnose vibration issues using existing infrastructure.
2Manufacturing precision
If spindle vibration is not accurately measured across varying rotation speeds, then the measurement system remains simple, but machining precision deteriorates due to undetected vibrations
Solution Approach 1:
The system dynamically adjusts measurement parameters based on spindle rotation speed. By varying the sampling frequency and analysis methods according to the rotation speed, the system maintains high measurement precision across different operating conditions, enabling accurate vibration detection whether the spindle rotates slowly or at high speed.
Solution Approach 2:
The system performs preliminary vibration measurements during the positioning movement phase before actual machining begins. This allows vibration characteristics to be assessed in advance at various rotation speeds, enabling selection of optimal rotation speeds that avoid resonant frequencies and ensure high machining precision.
3Adaptability or versatility
If conventional measurement methods are used, then the device complexity is low, but the ability to identify optimal rotation speed ranges is insufficient
Solution Approach 1:
The system implements feedback by continuously analyzing vibration data collected during spindle rotation and using this information to identify optimal rotation speed ranges. The processing unit compares vibration levels at different speeds and provides feedback on which ranges minimize vibrations, enabling adaptive selection of machining parameters for high-precision work.
Solution Approach 2:
The system varies measurement parameters such as sampling frequency, analysis window size, and frequency resolution based on spindle rotation speed. This allows the data processing system to adaptively optimize vibration assessment accuracy across different speed ranges, identifying optimal machining conditions without requiring overly complex fixed-parameter measurement systems.
Data Source
AI summary
A spindle vibration measuring system which measures vibration of a spindle in a machining device that performs a cutting or abrading process on a workpiece. The machining device has a workpiece holder that holds the workpiece, the spindle that holds a tool, and a moving mechanism that relatively moves the workpiece holder and the spindle. The spindle vibration measuring system acquires positional variation data or vibration data of the moving mechanism when the spindle rotates, and a result related to vibration of the spindle to output or store based on the positional variation data or the vibration data.