Dynamic Excitation Testing for Machine Tool Axis Stability
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Solution Overview
Problem
Existing machine tool performance analysis techniques fail to effectively assess the dynamic characteristics of numerically controlled machine tools, particularly under conditions of rapid acceleration and deceleration, which are crucial for precise positioning operations.
Innovation Solution
A method involving dynamic excitation commands is used to assess machine tool performance by measuring the response of the tool to sinusoidal or other patterns of motion, employing a sensor nest and a cubic reference block to quantify positional accuracy and stability across multiple axes, allowing for the evaluation of dynamic performance and cross-axis stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing machine tool performance analysis techniques are used, then static or slowly moving operational conditions can be assessed, but dynamic characteristics under rapid acceleration and deceleration cannot be effectively evaluated
Solution Approach 1:
The patent transforms static measurement methods into dynamic measurement methods by introducing dynamic excitation commands that induce rapid accelerations and decelerations. The system measures machine tool response under these dynamic conditions to characterize performance metrics such as positional accuracy, cross-axis stability, and surface finish quality during high-speed operation.
Solution Approach 2:
The patent employs dynamic excitation commands that create controlled vibrations and oscillations in the machine tool axes. By analyzing the machine's response to these vibrational inputs across different frequencies and amplitudes, the system extracts dynamic performance characteristics that cannot be observed under static conditions.
2Reliability
If dynamic excitation commands with large displacements are used, then dynamic performance can be assessed, but positioning accuracy requirements for precise machining operations are not met
Solution Approach 1:
The patent systematically varies parameters of the dynamic excitation commands including displacement amplitude (specifically constraining to less than 0.5 inches), frequency, and waveform patterns. This parameter optimization ensures that measurements are taken under dynamically representative conditions while maintaining positioning accuracy within acceptable tolerances for precise machining operations.
Data Source
AI summary
Disclosed are various systems and methods for assessing and improving the capability of a machine tool. The disclosure applies to machine tools having at least one slide configured to move along a motion axis. Various patterns of dynamic excitation commands are employed to drive the one or more slides, typically involving repetitive short distance displacements. A quantification of a measurable merit of machine tool response to the one or more patterns of dynamic excitation commands is typically derived for the machine tool. Examples of measurable merits of machine tool performance include dynamic one axis positional accuracy of the machine tool, dynamic cross-axis stability of the machine tool, and dynamic multi-axis positional accuracy of the machine tool.