IMU Linear Axis Diagnostics for Machine Tool Wear Detection
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Solution Overview
Problem
Machine tools experience performance degradation due to linear axis wear and failure, leading to reduced precision and accuracy, with existing condition monitoring methods being time-consuming and costly, and lacking robustness in detecting axis errors caused by degradation.
Innovation Solution
An inertial measurement unit (IMU) comprising accelerometers and rate gyroscopes is used to measure acceleration and angular rate, allowing for the determination of translational and angular geometric errors, enabling quick and efficient detection of linear axis degradation without disrupting production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing condition monitoring methods are used to detect linear axis degradation, then measurement precision is improved, but loss of time and productivity deteriorate due to time-consuming and costly procedures that disrupt production
Solution Approach 1:
The patent replaces traditional mechanical measurement systems (ballbars, laser interferometers) with an inertial measurement unit (IMU) that uses accelerometers and gyroscopes to detect linear axis degradation. This substitution enables continuous monitoring during production without requiring production stoppage, thereby reducing downtime while maintaining detection accuracy through inertial sensing technology.
Solution Approach 2:
The IMU system enables the machine tool to self-diagnose its own condition by continuously monitoring acceleration and angular rate data from its linear axes. The system processes its own operational data to detect performance degradation, eliminating the need for external measurement equipment and operators, thus allowing monitoring without production disruption.
2Measurement precision
If traditional measurement equipment is used to monitor linear axis performance, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The inertial measurement unit (IMU) serves multiple functions: it measures acceleration, measures angular rate, and provides data for detecting both translational and angular geometric errors of linear axes. This multi-functional sensor replaces multiple specialized measurement devices (ballbars for translational error, laser interferometers for angular error), thereby reducing device complexity and cost while maintaining comprehensive measurement precision.
3Manufacturing precision
If existing monitoring methods are implemented, then manufacturing precision is improved through detection of axis errors, but productivity deteriorates due to production disruption
Solution Approach 1:
The IMU-based monitoring system enables continuous detection of linear axis performance degradation during normal production operations. The system processes acceleration and angular rate data in real-time without interrupting the machining process, allowing manufacturing precision to be maintained and monitored while productivity continues uninterrupted, eliminating the trade-off between the two.
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 IMU-based method provides accurate and cost-effective detection of linear axis errors, reducing downtime and improving productivity by enabling periodic health monitoring of machine tools, with results converging within 5 minutes and achieving test uncertainty ratios of at least 4:1, thus optimizing maintenance and production planning.
Implementation Method 1
an accelerometer that: measures acceleration of the motion member
Implementation Method 2
a rate gyroscope that: measures an angular rate of movement of the motion member
Data Source
AI summary
A an inertial measurement unit determines performance degradation of a linear axis and includes: an accelerometer that, when disposed on a motion member of the linear axis including the motion member and a base member: measures acceleration of the motion member; and provides a displacement of the motion member in response to movement of the motion member; and a rate gyroscope that: measures an angular rate of movement of the motion member; and provides a yield angle for the motion member in response to movement of the motion member, wherein the displacement and yield angle determine performance degradation of the linear axis based on an error in linear movement of the motion member along the base member.