Rotary Axis Optical Error Measurement for Six-Degree Alignment
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Solution Overview
Problem
Current measurement technologies are inadequate for achieving multi-degree-of-freedom error measurement in rotary axes of machine tools, particularly for x-axis radial error, y-axis radial error, axial error, x-axis tilt error, y-axis tilt error, and angular alignment error, limiting the precision of machining tools.
Innovation Solution
A multi-degree-of-freedom error measurement system utilizing a plurality of light sources, a multi-facet reflector, an axicon, and two-dimensional optoelectrical sensors, where the operational unit calculates errors through ray tracing and first-order Taylor expansion equations based on positional variations of light spots, enabling precise measurement of rotary axes errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional measurement instruments (laser interferometers or auto collimators) are used for rotary axes, then angular alignment errors can be measured, but other errors (x-axis radial error, y-axis radial error, axial error, x-axis tilt error, y-axis tilt error) cannot be measured
Solution Approach 1:
The patent combines multiple light sources, a multi-facet reflector, an axicon, and two-dimensional optoelectrical sensors into a single integrated measurement system. This merging of components enables simultaneous measurement of multiple error types (radial errors, axial error, tilt errors, and angular alignment errors) that cannot be achieved with traditional single-function instruments
Solution Approach 2:
The measurement system is designed with multi-functionality to measure six different types of errors in rotary axes. The optical system can simultaneously detect x-axis radial error, y-axis radial error, axial error, x-axis tilt error, y-axis tilt error, and angular alignment error, making it a universal measurement tool for comprehensive rotary axis evaluation
2Measurement precision
If a multi-degree-of-freedom measurement system is implemented, then comprehensive error measurement is achieved, but the device complexity increases
Solution Approach 1:
The measurement system segments the measurement function into multiple optical paths, with each light source and sensor combination dedicated to detecting specific error components. The multi-facet reflector divides the optical paths further, allowing simultaneous measurement of multiple parameters while maintaining a manageable system structure through functional segmentation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enhances machining precision by accurately measuring and calculating multi-degree-of-freedom errors in rotary axes, improving the overall performance of machine tools.
Implementation Method 1
The first ray is incident to the multi-facet reflector, which reflects the first ray to give a reflective ray
Implementation Method 2
The second ray and the third ray are incident to the axicon and form a plurality of refractive rays and one or more reflective ray inside the axicon, respectively, for forming a first emitted ray and a second emitted ray
Data Source
AI summary
The present invention provides a multi-degree-of-freedom error measurement system for rotary axes and the method thereof. By producing a first ray, a second ray, and a third ray, the multi-facet reflector and the axicon disposed on an axis average line can receive the first, the second, and the third rays, respectively, for producing a reflective ray, a refractive ray, a first emitted ray, and a second emitted ray. Thereby, errors of the axicon in a plurality of degrees of freedom caused by shift or vibration of the axis average line, such as the x-axis radial error, the y-axis radial error, the axial error, the x-axis tilt error, the tilt error for the y-axis, and the angular alignment error for rotation can be measured.