Machine Tool Monitoring via Timestamped Data Bus Evaluation
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Solution Overview
Problem
Existing machine tool monitoring systems require significant effort for maintenance and installation, and they often necessitate substantial computer capacity directly on the machine tool, which can limit productivity and increase costs.
Innovation Solution
A method utilizing a production plant with real-time machine controllers, a non-real-time data bus connecting machine tools to an evaluation unit, where measurement data is timestamped and sent for automatic command generation and execution, allowing for decentralized evaluation and reduced hardware requirements on the machine tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time data processing and evaluation are implemented on the machine tool itself, then monitoring precision and reaction time are improved, but device complexity and computer capacity requirements increase significantly
Solution Approach 1:
The monitoring system is divided into two segments: the machine tool side (controlling unit) and the evaluation side (evaluation unit). The controlling unit collects measurement data and transmits it to the evaluation unit, which performs the complex data processing and evaluation. This segmentation allows the machine tool to maintain simple hardware while achieving precise monitoring through external evaluation.
Solution Approach 2:
A data bus serves as an intermediary between the machine tool and the evaluation unit. This intermediary enables the transmission of measurement data from the machine tool to the evaluation unit, allowing complex processing to occur externally while maintaining real-time monitoring capabilities through structured data exchange.
2Reliability
If real-time monitoring with immediate intervention is implemented, then production safety is improved, but device complexity and maintenance effort increase
Solution Approach 1:
The system separates the safety-critical monitoring function (evaluating measurement data against thresholds and generating alarms) from the machine tool's control system. The evaluation unit independently assesses measurement data and can trigger alarms or interventions, ensuring production safety without adding complex safety systems to the machine tool itself.
Solution Approach 2:
The evaluation unit autonomously processes measurement data, compares it against predefined thresholds, and generates appropriate responses without requiring constant human intervention or complex machine tool configurations. This self-service capability maintains safety while reducing the maintenance burden on the machine tool system.
3Ease of operation
If centralized data evaluation is implemented on a separate evaluation unit, then ease of operation and flexibility are improved, but data transmission time and reaction delay increase
Solution Approach 1:
The data bus enables continuous transmission of measurement data from the machine tool to the evaluation unit, ensuring that evaluation can proceed without interruption. This continuous data flow allows the system to maintain operational flexibility while minimizing transmission delays through sustained, real-time data exchange.
Solution Approach 2:
The data bus acts as an efficient intermediary that enables rapid data transmission between the machine tool and evaluation unit. This dedicated communication channel ensures that centralized evaluation can be performed without significant time loss, maintaining both flexibility and real-time responsiveness.
Data Source
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AI summary
The invention relates to a method for monitoring at least one machine tool (12), comprising the following steps: (a) real-time detecting of time-dependent measurement data (Mi) characterising a production process running on the machine tool (12); (b) providing the measurement data (Mi) with a time stamp, which encodes a time (tj) at which respective measurement data (Mi) was detected, such that measurement results (Mi(tj)) are obtained; (c) transmitting the measurement results (Mi(tj)) to an evaluation unit (28) via a non-real-time capable data bus (26); (d) calculating at least one command (B) from the measurement results by means of the evaluation unit; (e) transmitting the at least one command (B) via the data bus (26); and (f) monitoring the production process in real time by means of a program containing the command (B).