In-Process Grinding Measuring Device Calibration
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Solution Overview
Problem
Measuring devices for in-process measurement during machining operations on grinding machines are sensitive to deviations in geometric relationships due to component tolerances and wear, leading to measuring errors.
Innovation Solution
The measuring device is calibrated to account for actual geometric relationships, including deviations from desired geometry caused by wear and altered kinematics, using a control apparatus that switches between measuring and calibration modes, with calibrations possible at predetermined intervals or as needed, and utilizing a Flick standard for precise calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the measuring device is used continuously during grinding operations, then productivity is maintained, but measuring accuracy deteriorates due to wear and kinematic changes
Solution Approach 1:
The patent applies preliminary action by performing calibration before the measuring device is put into continuous operation. The control apparatus is configured to perform a calibration measurement using a calibration object (such as a roundness standard) before actual crank pin measurements begin. This preliminary calibration establishes accurate geometric relationships at the start of operation, ensuring measurement precision is established before wear and kinematic changes occur during continuous grinding operations.
2Measurement precision
If calibration is performed frequently to maintain accuracy, then measuring precision is improved, but device complexity and operation time increase
Solution Approach 1:
The patent applies self-service by enabling the measuring device to perform its own calibration automatically. The control apparatus is configured to automatically control the measuring head, rod assembly, and other components to execute calibration measurements without requiring manual intervention or external calibration equipment. The device uses its own measuring sensor and control systems to perform calibration using a simple calibration object, thereby maintaining precision while avoiding increased operational complexity.
3Device complexity
If geometric relationships are assumed to be fixed, then device complexity is reduced, but measurement precision deteriorates due to wear and tolerance deviations
Solution Approach 1:
The patent applies dynamics by transitioning from fixed geometric relationships to dynamic, measurable geometric relationships. Instead of assuming fixed geometry, the control apparatus measures actual geometric relationships during calibration and stores them as calibration data. This allows the system to adapt to wear and tolerance deviations by using measured values rather than assumed fixed values, thereby maintaining measurement precision while managing geometric complexity through automated measurement and storage.
Data Source
AI summary
A measuring device for in-process measurement of test pieces during a machining operation on a machine tool, in particular a grinding machine, has a base body, and a measuring head movable between a neutral position and a measuring position and which is connected to the base body via a rod assembly which is configured and set up in such a way that the measuring head in the measuring position follows orbital rotations of a test piece about a rotational axis. The measuring head has a measuring sensor which is deflectable along a linear axis for recording measured values during a measuring operation. A control apparatus is provided for controlling the measuring operation. The control apparatus is configured and set up in such a way that the measuring device may be calibrated in a calibration mode.