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Testing technology on-the-fly instrument LaserTRACER
Vala, Michal ; Vetiška, Jan (referee) ; Holub, Michal (advisor)
This diploma thesis describes realization and testing on-the-fly measurement using tracking interferometer. This measurement enables to achieve higher amount of measured points and decrease time of machine tool calibration. Calibration and verification values of machine parameters, as well as time of measurement and other details of this method are compared with results of conventional method called trigger. To evaluate the quality of volumetric compensation created from calibration values, we use verification measurement of circular interpolation.
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Measurement of geometric accuracy of machine tools
Nakládalová, Tereza ; Zahálka, Jiří (referee) ; Knobloch, Josef (advisor)
In this bachelor thesis the measurement of geometric accuracy of machine tools is described. The measurement of circle interpolation is implemented and the results are evaluated. The theoretic part deals with sources of error origin and accuracy division according to affecting factors. Further, the geometric errors are analyzed and determination of basic methods outlined. The next part of this work describes different kinds of current measuring devices and their principles of testing. For approaching the volumetric accuracy of machine tool other methods are discussed. The experimental part deals with testing the machine tool and result evaluation for each working plain and whole workplace. In conclusion, the particular measurements with varying input testing parameter are compared.
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EFFECT OF GEOMETRICAL PRECISION MACHINING CENTERS ON THE DESIRED CHARAKTERISTICTS OF THE GOODS
Holub, Michal ; Demeč, Peter (referee) ; Hýbner, Břetislav (referee) ; Pernikář, Jiří (referee) ; Marek, Jiří (advisor)
The main subject of this doctoral thesis is the influence of the geometrical accuracy of large CNC machine tools on desired features of produced work pieces. Doe to globalized market environment and competition producers of machine tools have changed their strategy for delivery of their products to customers. The main issue is not only to deliver a machine tool as such; supporting instructions related to the technology of the cutting process on the machine tool are of great importance. When taking delivery, the customer can see a new machine tool that will produce by him specified work piece with a desired accuracy. In the proposed thesis, a development of a novel methodology of measuring vertical lathes for prediction of chosen geometrical parameters of work pieces is introduced. The main goal of this work has been to determine the influence of the geometrical accuracy of selected design groups of a vertical lath on the future geometric accuracy of the work piece. The proposed methodology has been developed and verified on a selected vertical lath SKIQ30 produced by TOSHULIN, a.s. For identification of chosen parameters of the vertical lath a measuring system using latest measuring technologies has been applied. The basic tool for measured data processing has been a set of statistic methods for prediction of behaviour of measured design groups of the machine. The foundation for statistical processing has been calculation of geometrical deviations obtained from algorithms designed for proposed measurement methodology. The proposed measurement methodology for vertical lathes has been divided into two parts. In the first part, the methodology of measurement and evaluation of linear axes is solved, where a measuring system Laser Track has been used. The employment of the system Laser Track turned out to be very suitable. Conclusions related to the accuracy of the measuring device have been drawn in the thesis. The second part of the proposed methodology is represented by observation and description of the rotating disk, where non-contact position transducers have been used. In the course of the doctoral dissertation it has been observed that the studied (with respect to the geometry) behaviour of the machine is significantly affected by the cutting conditions. To these belong the loading of the rotating disc by the mass of the work piece, angular velocity of the rotating disc and the operating time of the machine. Based on these observations it can be stated that for prediction of work piece features it is essential to know the behaviour of the machine tool in the whole range of the operating speeds and loading of the rotating disc. A part of the proposed methodology for measuring vertical lathes seems to be very suitable for a design of a diagnostic system that could be applied on large rotating disc. Furthermore, it is recommended to extend the doctoral thesis in order to develop a unit for compensation of geometrical errors on rotating discs of vertical lathes.
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Compensation of Linear Encoder of Maching Center
Štěpánek, Vojtěch ; Šooš, Ĺubomír (referee) ; Suchánek, Rostislav (referee) ; Marek, Jiří (advisor)
A CNC machine tool is a complex mechatronic system whose behaviour is influenced by a change in temperature gradient. Nowadays, we could state that under certain conditions it is a cyber-physical system. From this point of view, there are two approaches to solve this problem. One direction solves the whole machine using a suitable method as a whole. Models are often very complex and their reliability is often questi-onable. This work deals with the decomposition of the machine using a systems approach, with the intention of finding the dependencies between the geometric error of the on-axis position accuracy and the temperature gradient. Then, using a suitable virtual model, predict the evolution of the temperature error and based on this prediction, make actionable interventions in the machine tool control system to eliminate the on-axis homing error as much as possible. One of the basic building blocks of the machine tool in terms of positioning is the linear encoder, which acts as a direct feedback member of the axis position control. Therefore, this publication is mainly devoted to the thermal behaviour of the linear encoder.
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Prediction of Selected Parameters of Rotational Kinematics Pairs of Machine Tools
Marek, Tomáš ; Šooš, Ĺubomír (referee) ; Kolář, Petr (referee) ; Blecha, Petr (advisor)
The dissertation thesis is used as a methodology for prediction of selected parameters of rotational kinematic pairs of machine tools. The motivation for its writing has been continually increasing requirements for parameters (performance, accuracy, static and dynamic stiffness) of machine tools. The methodology takes into account the availability of suitable measuring devices and description of the design of rotary kinematic pairs. It will be useable for predicting the behavior of rotational kinematic pairs, even at the design stage by applying results to the machine design. The work is processed so that first is used a system approach to suggest methodology for prediction of the behavior of rotary kinematic pair in CNC machine tools, planning measurement strategy and verifying the results, including applications for specific kinematic chain of the selected machine. Based on this system approach and the resulting methodology, the measurement of the rotary kinematic pair was performed. The results of the system approach and measurement are generalized in the form of recommendations for designers of machining centers, allowing to increase the accuracy of the rotational kinematic pair.
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Data processing from measuring machine tools
Jelínek, Adam ; Marek, Tomáš (referee) ; Holub, Michal (advisor)
The aim of this bachelor thesis is to propose a procedure of an implementation of periodic control of geometric accuracy of machine tools into the maintenance process in Walter s.r.o. company. To carry out an initial series of measurements, evaluate collected data and to advice further actions based on the evaluation. Presented thesis also introduces some quality management tools, which may be used for the implementation of the process.
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Testing technology on-the-fly instrument LaserTRACER
Vala, Michal ; Vetiška, Jan (referee) ; Holub, Michal (advisor)
This diploma thesis describes realization and testing on-the-fly measurement using tracking interferometer. This measurement enables to achieve higher amount of measured points and decrease time of machine tool calibration. Calibration and verification values of machine parameters, as well as time of measurement and other details of this method are compared with results of conventional method called trigger. To evaluate the quality of volumetric compensation created from calibration values, we use verification measurement of circular interpolation.
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Root cause analysis of scrap during production of bearing rings in a roller bearing company
Studýnka, Pavel ; Marek, Tomáš (referee) ; Marek, Jiří (advisor)
This diploma thesis concerns about measuring of rings of bearings from the input material, throughout machining processes, such as turning, heat treatment, grinding, till finishing operations as honing. Purpose of this thesis is to map all the processes in a roller/needle bearing company, measuring of rings of bearings, evaluating data, propose actions leading to decrease the number of scrap product and technical-economical evaluation of changed processes.
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