Multi-Axis Rotation Center Measurement for Machining Precision
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Solution Overview
Problem
Multi-axis processing machines face significant challenges in accurately measuring geometric errors of rotation axes, leading to processing precision issues due to errors in assembly, weight-induced bending, and heat-related displacement, which worsen with the number of axes, causing shifts in rotation center positions and deteriorating processing accuracy.
Innovation Solution
A rotation center measurement method that analyzes the processing program to calculate command angles, uses frequency distributions to determine high-frequency measurement angles, and adjusts the position of a reference sphere to accurately measure rotation centers, minimizing processing errors without additional equipment, and reducing initial setup time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the position of the rotation center is obtained by arc approximation using fixed rotation angles, then the measurement process is simple, but the position of the rotation center shifts when measurement angles differ from actual processing angles, deteriorating processing precision
Solution Approach 1:
The patent applies preliminary action by analyzing the processing program in advance to extract command angles that will be used during actual work processing. These extracted angles are then used to determine the optimal measurement angles for the reference sphere, ensuring that the measurement is performed at the exact angles that will be used during processing, thereby eliminating angle mismatch errors
Solution Approach 2:
The patent changes the measurement parameters (rotation angles) from fixed predetermined values to dynamic values extracted from the actual processing program. By adjusting the measurement angles to match the command angles in the processing program, the system adapts to different processing scenarios and maintains high precision across various work conditions
2Ease of operation
If traditional geometric deviation measurement is performed without analyzing the processing program, then the measurement setup is straightforward, but the rotation center position shifts due to angle differences between measurement and actual processing
Solution Approach 1:
The system performs preliminary analysis of the processing program to extract command angles before the actual measurement and processing operations. This preliminary action ensures that the measurement is configured with the correct angles from the start, eliminating the need for complex angle adjustments and maintaining both operational simplicity and measurement accuracy
Solution Approach 2:
The patent implements feedback by using the command angles extracted from the processing program to guide the measurement process. The measurement system receives feedback about the actual processing angles and adjusts its measurement angles accordingly, creating a closed-loop system that maintains high precision
Data Source
AI summary
The disclosure is a rotation center measurement method of a multi-axis processing machine which relatively moves tables on which a work piece is placed and a tool for processing the work piece by control of rotation axes based on a processing program, and the rotation center measurement method is characterized to include: a processing program acquisition step in which the processing program is acquired; a processing program analysis step in which command angles of tool postures are read from the processing program and analyzed, and measurement angles are calculated based on the analysis results; and a geometric deviation measurement step in which a reference sphere is placed on the tables and the tables and the tool are relatively moved to measure a position of the reference sphere, and directions and positions of rotation centers of the rotation axes are calculated.