Multi-Spindle Chattering Avoidance via Acoustic Frequency Detection
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Solution Overview
Problem
Traditional feedback control numeric machine tools are limited in simultaneously monitoring and addressing chattering issues across multiple spindles, often requiring shutdown and lengthy troubleshooting, which hampers continuous machining and efficiency.
Innovation Solution
A feedback control numeric machine tool and method that utilize an acoustic frequency detecting module and spindle position detecting modules to monitor and immediately address chattering in multiple spindles by adjusting parameters like rotation speed and cutting depth, allowing continuous operation without shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional feedback control methods are used to monitor spindle chattering, then chattering avoidance can be achieved for a single spindle, but the machine tool must be shut down when chattering occurs and cannot handle multiple spindles simultaneously
Solution Approach 1:
The patent divides the monitoring system into multiple independent acoustic frequency detecting modules, each corresponding to a specific spindle. This segmentation allows each module to independently monitor its associated spindle without interfering with others, enabling simultaneous chattering detection across multiple spindles while maintaining continuous operation of non-chattering spindles
Solution Approach 2:
The control module receives acoustic frequency data from the detecting modules and implements real-time feedback control. When chattering is detected in a specific spindle, the control module adjusts parameters (rotation speed, cutting depth) only for that spindle while allowing other spindles to continue operating, thus maintaining productivity while ensuring reliability
2Measurement precision
If a microphone or microphone array is employed to detect noise, then chattering detection is possible, but the system can only support or work on a single spindle
Solution Approach 1:
The patent employs multiple acoustic frequency detecting modules distributed across the machine tool, with each module positioned to monitor a specific spindle. This spatial segmentation enables the system to maintain high detection precision for each individual spindle while simultaneously supporting multiple spindles, overcoming the limitation of single-spindle support in traditional microphone-based systems
Solution Approach 2:
The control module is designed with universal functionality to handle data from multiple acoustic frequency detecting modules simultaneously. It can process and respond to chattering signals from any or all spindles independently, making the system adaptable to multi-spindle configurations while maintaining the detection accuracy achieved in single-spindle applications
3Reliability
If the machine tool is shut down to troubleshoot spindle chattering, then chattering can be addressed, but considerable time is lost and machining process cannot be effectively reduced
Solution Approach 1:
The acoustic frequency detecting modules continuously monitor spindle conditions before chattering becomes severe. The control module detects early signs of chattering and takes preliminary corrective actions (adjusting rotation speed, cutting depth) automatically, preventing the need for complete shutdown and troubleshooting, thus reducing machining time loss while maintaining effective chattering control
Solution Approach 2:
The system implements self-service through automatic detection and correction of chattering conditions. When chattering is detected in a specific spindle, the control module automatically adjusts the parameters of that spindle without requiring operator intervention or machine shutdown, enabling the system to service itself and maintain continuous operation of other spindles
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simultaneous monitoring and immediate chattering avoidance across multiple spindles, ensuring continuous operation and enhanced machining efficiency by identifying and correcting chattering issues in real-time.
Implementation Method 1
an acoustic frequency detecting module that detects an acoustic frequency of the spindles when machining the workpiece
Data Source
AI summary
A feedback control numerical machine tool and a method thereof are provided. The machine tool includes at least two spindles, an acoustic frequency detecting module, at least two spindle position detecting modules, and a control module. The spindles machine a workpiece. The acoustic frequency detecting module detects an acoustic frequency of the spindles when machining the workpiece. The spindle position detecting modules detects position information of the spindles when machining the workpiece. The control module acquires the acoustic frequency and the position information of the spindles, monitors whether any of the spindles chatters according to the acoustic frequency of the spindles, and performs chattering avoidance to the spindle that chatters according to the position information of the spindles. As such, the present disclosure performs chattering monitoring to a plurality of spindles and avoids the chattering immediately.