No abstract

− Nowadays the process-control of concave extruding is a measuring task with rising requirements. A novel optical bi-sensorial measurement system -consisting of a shadow-and a light-section-system -as well as suitable methods of analysis for the in-line inspection are presented. The proposals help to ensure the product quality on a higher level than before. The combination of dimensional accuracy and data-density leads to excellent results. The optical multisensor measurement system has to be calibrated and aligned to detect the same surface zone despite of high refresh rates and optical resolutions. The metered characteristics will be coordinate transformed to extrinsic world-coordinates for evaluating form deviations of complex parts. An appropriate user-interface enables to re-calculate measurement objects in-line and evaluate the conformity of the part consequently. Finally the real length information assists to influence the process control. After successful test in laboratory the results will be proved in production to the target: measurement uncertainty of better 0.1 mm at every profile.

Nowadays the process-control of concave extruded profiles is a measuring task with rising requirements. A novel optical bi-sensorial measurement system -consisting of a shadow-and a light-section-system -as well as suitable methods of analysis for in-line inspection are presented. The proposals help to ensure the product quality on a higher level than before. The combination of dimensional accuracy and data-density leads to excellent results. Extruded profiles are semi-finished products (from steel, brass, aluminum, synthetics…) which are appointed for wide applications in technical products. For monitoring and controlling the parts in-line adequately, today often the shading technology is used. It detects -neglecting the profiles coat in measurement range -with high precision the dimension of the objects shadow orthographically to the axis of illumination. As a matter of fact, concave and local areas cannot be recorded. Alternatively, light-section-systems can measure concave zones and undercut zones but do not comply with the required accuracy. The combination of accuracy and data-density qualifies the mentioned multi-sensor metrology for realizing a maximum of efficiency in process control what ensures product quality and less defective goods. The optical multi-sensor measurement system has to be calibrated and aligned to detect the same surface zone despite of high refresh rates and optical resolutions. The metered characteristics will be coordinate transformed to extrinsic world-coordinates for evaluating form deviations of complex parts. An appropriate user-interface enables to re-calculate measurement objects in-line and evaluate the conformity of the part consequently. Finally the real length information assists to influence the process control. After a successful test in the laboratory the results will be proved in production to the target: measurement uncertainty of better than 0.1 mm at every profile.

No abstract

Optical Multi-Sensor-Measurements in the shop are often affected by external influences which dominate the quality of the measurements and disable low uncertainties. In this approach simulations are carried out to estimate the uncertainty contributions when the gravity point is set on external influences as they dominate production environments. The results are gained by different simulation types and are validated on two applications. The systematic contributions on the measurement uncertainty can be partly compensated a priori and the needed test time as well as efforts for modifications of the prototypic measurement systems can be reduced. So, the presented method leads to reduced costs for designing and implementing optical multi-sensor-metrology for efficient production.