tailieunhanh - Cảm biến trong sản xuất P14

Machining system by moving the workpiece back to the machining position and performing additional machining. In other words, the dimensional error of machining can be corrected before demounting the workpiece from the machine. Concerning the VS method, applications for the measurement of practical parts and improvements in reproducibility and accuracy are currently being investigated. | 286 I 4 Sensors for Process Monitoring Sensors in Manufacturing. Edited by . Tonshoff I. Inasaki Copyright 2001 Wiley-VCH Verlag GmbH ISBNs 3-527-29558-5 Hardcover 3-527-60002-7 Electronic Fig. Set-up for on-the-machine measurement machining system by moving the workpiece back to the machining position and performing additional machining. In other words the dimensional error of machining can be corrected before demounting the workpiece from the machine. Concerning the VS method applications for the measurement of practical parts and improvements in reproducibility and accuracy are currently being investigated. Welding . Haferkamp Universität Hannover Hannover Germany F. v. Alvensleben Laser Zentrum Hannover M. Niemeyer Universität Hannover W. Specker Laser Zentrum Hannover M. Zelt Universität Hannover Introduction Quality in welding depends not only on the various process parameters such as welding speed current and voltage eg for arc welding. In most cases the welding process is affected by tolerances and mismatch of the workpiece geometry tolerances in machines and clamping devices variations in groove shape tack beads and welding deformations. In manual welding trained welders are able to compensate for all these influences because their senses especially the eyes and ears give them the information they need to produce a high-quality weld. For mechanical and automatic welding all this information must be detected by sensors. Such a sensor for welding can be defined as follows 1 Welding 287 A detector if it is capable of monitoring and controlling welding operation based on its own capacity to detect external and internal situations affecting welding results and transmit a detected value as a detection signal is called as a sensor. Moreover its whole control device is defined as a sensor system control system . In this definition the external situation refers to all workpiece-related geometric values such as changes in dimensions of the