Measurement and calibration of machine tools in 6 DOFs in large workspace

• Autorzy: Benes P. , Valasek M. , Sveda J.
• Języki publikacji: EN

Abstrakty

EN

The measurement and calibration of machine tools in the large workspace (for example 10x20x3m) and in all 6 DOFs (3 cartesian translations and 3 rotations) is not an easy task. A new device called RedCaM (Redundant Calibration and Measurement Machine) has been developed that enables simultaneously to measure all 6 DOFs in the workspace. The RedCaM machine was designed with redundant number of sensors and therefore as a parallel kinematical structure. Thus it profits from the fact that the sensor errors are not chaining. It is equipped only with the sensors and it is operated by the drives of the measured machine tool after the attachment of the platform into the machine tool spindle. The redundancy of sensors provides better accuracy, self-calibration property and very good ratio between the errors of particular sensors and the resulting error of the end effector position. This has been optimized and has proven the improved (minimized) transfer of the errors between the sensors and the position in space in 6 DOFs. In particular the used redundancy of sensors (9 sensors for 6 DOFs) enables the self-calibration (all kinematical parameters are calibrated during the first motions in the workspace) and the minimized transfer of errors between the sensors and the 6 DOFs of the platform that has been experimentally proven to be 1:1. The paper deals with the description of the modification of RedCaM for the usage in the large workspace of machine tools that are in principle unlimited.

Słowa kluczowe

EN

measurement; calibration; machine tool; 6 DOFs; workspace

• Wydawca: Wydawnictwo Wrocławskiej Rady FSNT NOT
• Czasopismo: Journal of Machine Engineering
• Rocznik: 2009
• Tom: Vol. 9, No. 3
• Strony: 77--87
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Benes P.

• Department of Mechanics, Biomechanics and Mechatronics, Faculty of Mechanical Engineering, Czech Technical University in Prague, Karlovo namesti 13, 121 35 Praha 2, Czech Republic

autor

Valasek M.

• Department of Mechanics, Biomechanics and Mechatronics, Faculty of Mechanical Engineering, Czech Technical University in Prague, Karlovo namesti 13, 121 35 Praha 2, Czech Republic

autor

Sveda J.

• Department of Mechanics, Biomechanics and Mechatronics, Faculty of Mechanical Engineering, Czech Technical University in Prague, Karlovo namesti 13, 121 35 Praha 2, Czech Republic

Bibliografia

• 1. TRAPET E., AGUILAR J., SPAAN H., YAGUE A., ZELENY J, V., 2006, Self-Centring Probe with Parallel Kinematics, Precision Engineering, 30/2/165-179.
• 2. VALASEK M., 2004, Redundant Actuation and Redundant Measurement: The Mechatronic Principles for Future Machine Tools, In: Proc. of International Congress on Mechatronics. CTU, Prague, 131-144.
• 3. SIKA Z., VALASEK M., BAUMA V., BENES P., HAMRLE V., et al., 2006, Measuring Machine for 6 DOF with Minimized Error Transfer, In: Proceedings of Computational Mechanics, WBU, Pilsen, 2/609-616.
• 4. BENES P., VALASEK M., SIKA Z., BAUMA V., HAMRLE V., 2007, Experiments with Redundant Parallel Calibration and Measuring Machine RedCaM, Applied and Computational Mechanics, 1/2/387-392.
• 5. VALASEK M., SIKA Z., HAMRLE V., 2007, From Dexterity to Calibrability of Parallel Kinematical Structures, In: Proceedings of 12th World Congress in Mechanism and Machine Science IFToMM. Comité Français pour la Promotion de la Science des Mécanismes et des Machines, Besançon, [CD-ROM], 1-6.
• 6. VALASEK M., SULAMANIDZE D., BAUMA V., 2002, Spherical Joint with Increased Mobility for Octapod, In: Proc. of PKS 2002, Development Methods and Application Experience of Parallel Kinematics. IWU FhG, Zwickau, 285-294.
• 7. STEMBERA J., 2009, The Influence of Multiple Redundancy of Measurement on the Accuracy of Calibration and Measurement, PhD Thesis, CTU, Prague.
• 8. BENES P., VALASE M., SIKA Z., HAMRLE V., 2008, Experiments with RedCaM, In: Proc. of Danubia 25th Symposium on Advances in Experimental Mechanics, CTU, Prague, 1/ 9-10.