Machine Tool Speed Display for Chatter Vibration Suppression
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Solution Overview
Problem
Operators face difficulties in quickly determining and implementing changes to spindle rotating speeds to suppress chatter vibration in machine tools due to the dynamic nature of stability regions and the complexity of identifying necessary speed adjustments.
Innovation Solution
A display control device that calculates and displays recommended spindle rotating speeds and their change ratios on an operation screen, allowing operators to visually assess and implement changes within a predetermined adjustable range, thereby facilitating quick responses to chatter vibration occurrences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the operator manually determines and adjusts spindle rotating speed to suppress chatter vibration, then the operator can suppress chatter vibration, but the operator hesitates and responds slowly due to difficulty in determining the adjustment amount
Solution Approach 1:
The patent introduces a display control device as an intermediary between the chatter vibration detection and the operator's adjustment action. This device automatically calculates the recommended rotating speed and the adjustment amount, presenting this information clearly to the operator. The intermediary processing eliminates the operator's hesitation by providing pre-calculated, reliable adjustment guidance, thus reducing response time while maintaining effective chatter vibration suppression.
Solution Approach 2:
The system enables semi-automatic operation where the machine tool itself (through the display control device) determines the appropriate rotating speed adjustment based on detected vibration. The operator only needs to follow the displayed recommendations rather than performing complex manual calculations. This self-service approach to determining adjustment parameters significantly reduces the operator's cognitive load and response time.
2Adaptability or versatility
If the stability region changes dynamically, then the system adapts to current conditions, but it becomes difficult for the operator to follow the changes and make timely adjustments
Solution Approach 1:
The display control device continuously monitors the current rotating speed and compares it with the recommended speed, providing real-time feedback to the operator through the display unit. It shows the adjustment amount needed and the direction of change, enabling the operator to easily track and respond to dynamic stability region changes. This feedback mechanism translates complex dynamic adaptations into simple, actionable information.
Solution Approach 2:
The system performs preliminary calculation of the recommended rotating speed and adjustment amount before the operator needs to act. By pre-computing the optimal adjustment based on current vibration conditions and stability regions, the system prepares the adjustment guidance in advance, allowing the operator to simply follow the displayed recommendations without needing to understand or predict the dynamic changes themselves.
3Loss of information
If the operator needs to know current spindle rotating speed and recommended speed to determine adjustment, then the operator can make informed decisions, but the complexity of information processing increases
Solution Approach 1:
The display control device extracts and presents only the essential information needed for adjustment: the current rotating speed, the recommended rotating speed, and the adjustment amount. By separating and highlighting these key parameters from the complex stability region data, the system provides complete decision-making information while reducing the perceived complexity for the operator. The unnecessary computational complexity is handled automatically by the control device.
Data Source
AI summary
A display control device includes a calculation unit for calculating a first rotating speed on the basis of a vibration level detected by a vibration detection unit when the vibration level has exceeded a predetermined value, a change receiving unit for receiving a change instruction for changing a second rotating speed that is a rotating speed when the vibration level has exceeded the predetermined value to the first rotating speed, and a display control unit for performing control to display, on an operation screen, the first rotating speed, the second rotating speed, and a ratio display unit indicating a change ratio to a third rotating speed specified by a machining program, and performing control to display the first rotating speed at a position in the ratio display unit corresponding to a change ratio of the first rotating speed to the third rotating speed.