Waveform Display Device Converting Time-Based Vibration to Distance
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Solution Overview
Problem
Existing waveform display devices fail to effectively convert time-based vibration data from machine tools into distance-based data for analyzing machining unevenness on machined surfaces, making it difficult to identify vibration sources causing machining errors and failing to display frequency characteristics on a distance basis.
Innovation Solution
A waveform display device that includes a position information acquisition unit, a time designation unit, a tangent direction speed calculation unit, and a distance calculation unit to convert time-based vibration data into distance-based data on a machined surface, allowing for the display of vibration periods as distances between two points, enabling analysis and identification of vibration sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time-based waveform data is analyzed directly, then frequency information can be obtained, but it cannot be directly compared with machining unevenness on the machined surface
Solution Approach 1:
The patent transforms the parameter basis of waveform data from time domain to distance domain by converting time-based measurements into distance-based measurements using the relationship distance = feeding speed × time. This allows direct comparison with physical measurements on the machined surface while preserving frequency analysis capabilities.
Solution Approach 2:
The patent introduces feeding speed as an intermediary parameter that bridges the time-based waveform data and distance-based surface measurements. By multiplying time measurements by feeding speed, the system creates a converted distance waveform that serves as a mediator between temporal vibration data and spatial surface characteristics.
2Ease of operation
If time-based position information is converted to distance-based data, then direct comparison with machined surface becomes possible, but the conversion process becomes complicated
Solution Approach 1:
The patent simplifies the conversion process by changing the fundamental parameter from time to distance using a straightforward multiplication operation (distance = feeding speed × time). This single parameter transformation enables direct comparability between waveform data and machined surface measurements without complex processing.
3Measurement precision
If frequency analysis is performed on time-based data, then vibration frequency can be identified, but frequency characteristics cannot be displayed on a distance basis
Solution Approach 1:
The patent performs frequency analysis on the converted distance-based waveform data rather than original time-based data. By maintaining the mathematical relationship between time and distance through the feeding speed parameter, the system preserves frequency characteristics while enabling their display and interpretation in the distance domain, thus preventing information loss.
Data Source
AI summary
A waveform display device includes a position information acquisition unit for acquiring position information of a drive shaft of a machine tool in a time series manner, a time designation unit for designating a time section that is a display target in a time series of the position information, a tangent direction speed calculation unit for calculating a tangent direction speed of a tool tip end point of the machine tool based on the position information and configuration information of the machine tool, a distance calculation unit for converting the time section into a distance between two points on a machined surface of the machine tool based on the tangent direction speed, and a display unit for displaying the distance between the two points.