Machine Tool Display Control for Chatter Vibration Recording
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Solution Overview
Problem
Operators face challenges in recording and determining the effectiveness of countermeasures for chatter vibration in machine tools, as feature values like vibration magnitude and frequency change rapidly during machining, leading to potential time lags in manual recording methods.
Innovation Solution
A display control device for machine tools that includes a vibration detecting portion, a numerical control unit, and a display control unit to show time-series data of vibration levels and rotating speeds, allowing markers to be superimposed on the data to indicate changes, facilitating easier identification and documentation of effective countermeasures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the operator manually records the operation to determine effectiveness of countermeasures, then the record can efficiently cause subsequent chatter vibration to converge, but a time lag arises between the operation content and the operation timing
Solution Approach 1:
The system automatically records operation timing and content in advance without waiting for manual input after the fact. The display control unit captures and stores the timing when operation information is input, creating a preliminary record that is then displayed with vibration data, eliminating the need for delayed manual documentation.
Solution Approach 2:
The system provides immediate visual feedback by displaying operation timing markers overlaid on the vibration data in real-time. This allows the operator to see the direct correlation between their operations and vibration changes, confirming effectiveness without time lag and enabling immediate adjustments if needed.
2Loss of information
If the operator manually records operation details during machining, then ex-post determination of countermeasure effectiveness is enabled, but it is not easy for the operator to record the operation while operating a machine tool
Solution Approach 1:
The system performs automatic recording of operation timing and content without requiring manual intervention. The display control unit automatically captures operation information input timing and displays it with corresponding vibration data, allowing the system to serve itself in the recording task while the operator focuses on machining.
Solution Approach 2:
The manual mechanical process of writing down or noting operations is replaced by an automated electronic system that detects and records operation timing through the control unit. This substitution eliminates the physical burden of manual recording while preserving complete operation information.
3Device complexity
If time-series data of vibration and rotating speed is displayed without markers, then the display is simple, but it is difficult to identify the timing and effectiveness of countermeasures
Solution Approach 1:
The system uses visual markers with distinct appearances (such as different colors or symbols) to indicate operation timing on the time-series display. These markers stand out against the vibration and rotating speed data, making it easy to identify countermeasure timing without complicating the overall display structure.
Solution Approach 2:
The display is segmented into distinct visual elements: the continuous vibration and rotating speed data forms the background, while discrete operation timing markers are overlaid at specific points. This segmentation allows both simple continuous monitoring and precise countermeasure identification to coexist without increasing overall complexity.
Data Source
AI summary
A display control device according to an embodiment controls display of a state of a machine tool that includes (i) an attachment portion to which a tool is attachable, (ii) a numerical control unit for controlling (a) movement of the attachment portion and (b) a rotating speed of the tool in accordance with a machining program and (iii) a vibration detection unit for detecting vibration of the tool. This display control device includes a display control unit for controlling display of time-series data indicating (i) a change in a vibration level detected by the vibration detection unit and (ii) a change in the rotating speed of the tool. Upon receiving an instruction to change the rotating speed, the display control unit controls the display so that a marker indicating the change instruction is superimposed on the time-series data.