Measuring Machine Workpiece Positioning via Optical Contour Analysis
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Solution Overview
Problem
Existing measuring machines struggle with achieving both fast and precise positioning of workpieces, which is crucial for accurate measurement and alignment.
Innovation Solution
The proposed measuring machine incorporates a workpiece carrier with a rotating drive and an optical sensor, along with a sensor-positioning device and a position correction system. This setup allows for precise alignment and positioning of the workpiece by rotating the workpiece carrier around the machine's axis of rotation and adjusting the optical sensor's position to capture specific contours of the workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the workpiece carrier rotates continuously at constant speed, then positioning speed is improved, but positioning precision deteriorates
Solution Approach 1:
The system performs preliminary measurement of the workpiece contour while the carrier rotates continuously. The optical sensor captures contour data at multiple angular positions, and the control unit calculates the required corrective movements before final positioning is completed, enabling fast continuous rotation to maintain both speed and precision.
Solution Approach 2:
The control unit continuously monitors the position of the workpiece relative to the machine axis during rotation and adjusts the carrier position dynamically. This feedback mechanism allows the system to maintain precise positioning even during continuous rotation by compensating for any deviations in real-time.
2Measurement precision
If the optical sensor is positioned at multiple measuring positions, then measurement precision is improved, but device complexity increases
Solution Approach 1:
A single optical sensor is designed to perform multiple functions by being positioned at different measuring positions along the rotation axis. The sensor captures contour data at various angular positions, and the control unit processes this data to determine workpiece orientation and position, eliminating the need for multiple separate sensors while maintaining high measurement precision.
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
This solution enables fast and precise positioning of workpieces, allowing for accurate determination of offset and inclination relative to the machine's axis of rotation. The continuous rotation of the workpiece carrier and the use of multiple measuring positions enhance positioning accuracy and efficiency.
Implementation Method 1
An optical sensor (23) is assigned to the workpiece carrier (13). The detection range of the optical sensor is directed towards a working area, in which at least one section of the workpiece (11) is located when it is placed on the workpiece carrier (13).
Data Source
AI summary
A measuring machine and a process for positioning a workpiece in the measuring machine are disclosed. A workpiece carrier holding the workpiece is driven around an axis of rotation, and an optical sensor is positioned in a measuring position parallel to the axis of rotation. In this measuring position, measuring data, such as images, are recorded on the workpiece and made available to a control unit. In the control unit, an offset and/or an inclination of a longitudinal axis of the workpiece relative to the axis of rotation is determined from the measuring data of at least two measuring points on the workpiece and then reduced or eliminated by activating a position correction system of the measuring machine such that a specified positioning condition is fulfilled. The position correction system is configured to tilt and/or translationally move the workpiece carrier relative to the axis of rotation.