Vibration Analysis Device for Machine Tool Streak Pattern Identification
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Solution Overview
Problem
Machine tools face challenges in calculating the vibration cycle of a tool with respect to a workpiece during processing, as the relative velocity between the tool and workpiece changes, leading to uneven streak patterns on the processed surface, making it difficult to determine the vibration cycle causing these patterns.
Innovation Solution
A vibration analysis device that calculates the vibration cycle by acquiring positional information, calculating tangential velocities and movement distances, and using cross-correlation functions to determine the vibration cycle based on measured streak intervals and movement distances, even when the relative velocity changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the machine tool processes the workpiece while changing the relative velocity of the tool with respect to the workpiece, then the productivity is improved, but the streak interval becomes uneven and the vibration cycle calculation becomes difficult
Solution Approach 1:
The patent introduces a vibration cycle calculation unit that acts as an intermediary between the positional information acquisition unit and the streak pattern analysis. This unit processes the raw positional data through tangential velocity calculation and movement distance calculation to produce vibration cycle information, enabling accurate measurement even when velocity varies during processing.
Solution Approach 2:
The patent replaces direct mechanical measurement of vibration cycles with an information processing approach. Instead of mechanically measuring vibration, the system uses positional information from the drive axis, calculates tangential velocity and movement distance, and derives vibration cycle characteristics through computational analysis, substituting mechanical measurement with digital signal processing.
2Manufacturing precision
If the tool vibrates during processing, then the vibration cycle causes streak patterns on the workpiece surface, but calculating the vibration cycle becomes difficult when velocity changes
Solution Approach 1:
The patent performs preliminary calculations of tangential velocity and movement distance based on positional information before analyzing streak patterns. By pre-processing the positional data to extract velocity and distance characteristics, the system prepares the necessary parameters for vibration cycle calculation, making the detection process more straightforward even when velocity varies.
Solution Approach 2:
The system uses the calculated vibration cycle information to analyze and identify streak patterns on the workpiece surface. The vibration cycle calculation unit provides feedback about the vibration characteristics, enabling the system to detect and measure vibration cycles accurately by correlating them with the observed streak patterns.
Data Source
AI summary
A vibration analysis device calculates a vibration cycle which occurs during a period in which a workpiece is processed by a machine tool, and includes a tangential velocity calculation unit which calculates a velocity in a tangential direction of a movement path of a processing point by using positional information of a drive axis. The vibration analysis device comprises a movement distance calculation unit which calculates a first movement distance of the processing point on the movement path by using the velocity in the tangential direction. The vibration analysis device comprises a vibration cycle calculation unit which calculates a vibration cycle corresponding to streaks on the basis of previously measured streak intervals on the workpiece and the first movement distance of the processing point.