Machine Tool Drive Frequency Monitoring for Tool State Detection
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Solution Overview
Problem
Existing methods for detecting tool states in machine tools are complex and costly due to the need for additional sensor means, especially in space-constrained environments.
Innovation Solution
A method that uses a control unit with a storage means to detect and evaluate the actual drive frequency of a rotary or positioning drive, assigning it to a reference drive frequency to determine the tool state, eliminating the need for additional sensors and allowing for real-time monitoring and reporting of tool conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor means are installed to detect the actual state of machine tool components, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The machine tool's existing drive system serves dual purposes: both machining operations and tool state monitoring. The drive frequency data, already generated during normal operation, is reused for tool condition assessment without requiring separate sensing mechanisms. This self-service approach eliminates the need for additional sensors while maintaining detection capability.
Solution Approach 2:
The drive system is made multi-functional by using it for both its primary machining function and secondary tool state monitoring function. The same drive frequency measurements that control machining operations are simultaneously used to detect tool wear, looseness, and other tool conditions, eliminating the need for dedicated sensor systems.
2Measurement precision
If sensor means are installed to detect the actual state of machine tool components, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The system utilizes existing drive system data for tool state monitoring, making the monitoring function self-funded through reuse of already-collected operational data. No additional sensor costs, installation costs, or maintenance costs are incurred since the drive system already generates the necessary frequency information during normal operation.
Solution Approach 2:
Instead of physically sensing tool conditions through additional sensors, the system creates a virtual copy of tool state information by analyzing patterns in the drive frequency data. This digital replication of monitoring functionality avoids all physical sensor-related costs while providing equivalent diagnostic information.
3Measurement precision
If multiple machining operations are stored in the control unit with specific TARGET frequencies, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system transitions from storing discrete TARGET frequency values for specific operations to storing reference drive frequency patterns that represent tool states. By changing the parameter from operation-specific frequencies to state-specific frequency patterns, the system reduces the number of stored values needed while improving diagnostic capability.
Solution Approach 2:
Instead of assigning target frequencies to machining operations and then comparing actual frequencies, the system inverts the approach by storing reference frequencies associated with tool states and comparing actual drive frequencies against these state references. This reversal simplifies the data structure from operation-centric to state-centric.
Data Source
AI summary
A method for detecting at least one tool state of a tool of a machine tool for machining workpieces, which includes at least one tool holder, at least one positioning drive, which includes at least one tool which is arrangeable or arranged rotationally fixed in the tool holder and which includes at least one control unit. The method includes the following steps: detecting or providing tool and/or workpiece data in the storage means and/or the control unit; providing at least one reference drive frequency of the rotary drive and/or the positioning drive; detecting at least one ACTUAL driving frequency of the rotary drive and/or the positioning drive; assigning the ACTUAL drive frequency of a reference drive frequency of the rotary drive and/or the positioning drive by the control unit and evaluating and/or interpreting at least the reference drive frequency associated with the ACTUAL drive frequency by the control unit.