Advanced methods for ensuring the accuracy of manufacturing machines

Course guarantor:

Otakar Horejš

Lecturer:

Otakar Horejš, Martin Mareš, Matěj Sulitka, Jiří Švéda

Tutor:

Otakar Horejš, Martin Mareš, Matěj Sulitka, Jiří Švéda

Supervisor:

Department of Production Machines and Equipment

Synopsis:

Introduction to the accuracy of production machines. Main components of production accuracy. Influence of adjustable groups, drives and their control on accuracy. Temperature effects.

Experimental methods in the field of accuracy of production machines. Measuring equipment and sensors in relation to machine kinematics. Data collection from control systems. Processing and interpretation of experimental data. Related standards.

Compensation of geometric errors of production machines. Basic concepts, division, functions in control systems.

Approaches to minimizing temperature errors of machines. Division of approaches, their applicability in different stages of machine development.

Software temperature compensation of machine tools. Approximate quality of models. Phenomenological models. Temperature compensation based on linear regression analysis, transfer function theory, artificial neural networks. Industrial implementation.

Adaptive compensation methods. Long-term stability of models (robustness). Updating the compensation model using in-process measurement on machine tools during operation (OMM On-Machine-Measurement).

Volumetric accuracy of machines. Experimental and compensation methods. Influence of inhomogeneity of the temperature field.

Influence of the cutting process on the accuracy of production machines. Factor analysis. Experimental identification.

Simulation methods in the field of machine accuracy. Use of the finite element method (FEM) to improve geometric accuracy and predict temperature-deformation behavior. Experimentally validated models for increasing reliability.

Structural interventions to increase the accuracy of production machines. Design and validation of optimization measures using FEM. Cooling of structures and components. Design of a supporting structure with reduced sensitivity to thermal phenomena.

Validation and verification of computational models and methods for increasing machine accuracy. Control workpieces.

Requirements:

Syllabus of lectures:

Syllabus of tutorials:

Study Objective:

Study materials:

Books:

MAYR, J. et al. Thermal issues in machine tools. CIRP Ann.Manuf.Technol. 2012, 61 (2), 771791. ISSN 0007-8506.

INCROPERA, F. a D. DEWITT. Introduction to Heat Transfer. John Wiley & Sons. New York. NY, 1996, 997 s.

RAMESH, R. M. A. MANNAN a A. N. POO. Error compensation in machine tools - a review: Part II:

thermal errors. Int.J.Mach.Tools Manuf. 2000, 40 (9), 1257-84. ISSN 0890-6955.

IBARAKI, S. a W. KNAPP. Indirect Measurement of Volumetric Accuracy for Three-axis and Five-axis Machine Tools: A Review. Int. J. Automation Technol. 2012, 6 (2), 110-24.

Normativs:

ISO 230-3, Test Code for Machine Tools - Part 3: Determination of Thermal Effects. Genf (Switzerland), 2007.

ISO 230-7: Test code for machine tools Part 7: Geometric accuracy of axes of rotation. Genf (Switzerland), 2006.

ISO 13041-8: Test Conditions for Numerically Controlled Turning Machines and Turning Centres Part 8: Evaluation of Thermal Distortions. Genf (Switzerland), 2004

ISO 10791-7:2014, Test conditions for machining centres - Part 7: Accuracy of finished test pieces. Genf (Switzerland), 2014.

ISO 10791-10, Test Conditions for Machining Centres Part 10: Evaluation of Thermal Distortion. Genf (Switzerland), 2007.

Note:

Time-table for winter semester 2025/2026:

Time-table is not available yet

Time-table for summer semester 2025/2026:

Time-table is not available yet

The course is a part of the following study plans: