A maior parte dos produtos industrializados, principalmente na indústria metal mecânica, sofre algum tipo de processo de usinagem em alguma de suas etapas de produção. A máquina-ferramenta CNC, se destaca atualmente nessa indústria devido sua alta produtividade e precisão. Contudo, erros geométricos em peças usinadas podem prejudicar o desempenho da indústria causando perda de lotes, insatisfação do cliente e mal funcionamento do produto final. Entre as causas de erros geométricos em peças usinadas, erros térmicos da máquina-ferramenta correspondem a 70% do total. Esses podem ser reduzidos com a aplicação de uma estratégia de compensação térmica, a qual pode se basear em um modelo empírico, atuando em conjunto com a correção do sistema de coordenadas em máquinas CNC. Este trabalho obteve modelos de deformação térmica por meio de medições de posição e temperatura durante ciclos de aquecimento e ensaios de usinagem. Visando um modelo robusto com baixo número de sensores, os modelos foram classificados estatisticamente. Além disso seus comportamentos foram analisados segundo modos de erro térmico de cada componente principal da máquina ferramenta. O sistema de compensação foi desenvolvido, implementado e testado utilizando-se um centro de torneamento. / Most manufactured products, mainly in metalworking industry, have some kind of machining process included in their processing stages. The CNC machine tool plays na important role in the industry due to its high productivity and precision. However, geometrical erros in machined parts can decrease the performance of the industry, causing rejected batches, customer dissatisfaction and malfunction of the final product. Among the causes of geometric errors on machined parts, thermal errors of machine tool corresponding to 70% of the total. For CNC machines, these errors can be reduced by implementing a strategy of thermal compensation, wich may be based on an empirical model, working in parallel with the correction of the coordinate system. This research work led to the development of thermal deformation models obtained by measurements of position and temperature cycles for heating and machining tests. Targeting a robust design with a low number of sensors, the statistical models were ranked. In addition, the behavior of the models was analyzed according to the thermal error modes of each main component of the machine tool. The compensation system was developed, implemented and tested in a CNC turning center.

A maior parte dos produtos industrializados, principalmente na indústria metal mecânica, sofre algum tipo de processo de usinagem em alguma de suas etapas de produção. A máquina-ferramenta CNC, se destaca atualmente nessa indústria devido sua alta produtividade e precisão. Contudo, erros geométricos em peças usinadas podem prejudicar o desempenho da indústria causando perda de lotes, insatisfação do cliente e mal funcionamento do produto final. Entre as causas de erros geométricos em peças usinadas, erros térmicos da máquina-ferramenta correspondem a 70% do total. Esses podem ser reduzidos com a aplicação de uma estratégia de compensação térmica, a qual pode se basear em um modelo empírico, atuando em conjunto com a correção do sistema de coordenadas em máquinas CNC. Este trabalho obteve modelos de deformação térmica por meio de medições de posição e temperatura durante ciclos de aquecimento e ensaios de usinagem. Visando um modelo robusto com baixo número de sensores, os modelos foram classificados estatisticamente. Além disso seus comportamentos foram analisados segundo modos de erro térmico de cada componente principal da máquina ferramenta. O sistema de compensação foi desenvolvido, implementado e testado utilizando-se um centro de torneamento. / Most manufactured products, mainly in metalworking industry, have some kind of machining process included in their processing stages. The CNC machine tool plays na important role in the industry due to its high productivity and precision. However, geometrical erros in machined parts can decrease the performance of the industry, causing rejected batches, customer dissatisfaction and malfunction of the final product. Among the causes of geometric errors on machined parts, thermal errors of machine tool corresponding to 70% of the total. For CNC machines, these errors can be reduced by implementing a strategy of thermal compensation, wich may be based on an empirical model, working in parallel with the correction of the coordinate system. This research work led to the development of thermal deformation models obtained by measurements of position and temperature cycles for heating and machining tests. Targeting a robust design with a low number of sensors, the statistical models were ranked. In addition, the behavior of the models was analyzed according to the thermal error modes of each main component of the machine tool. The compensation system was developed, implemented and tested in a CNC turning center.

This master´s thesis deals with the design of the headstock of a turning center. The aim of the work is the design solution of turning headstock with output of about 5 kW with the possibility of positioning in the C axis. The introductory part of this thesis is focused on the descripti-on of the basic parameters of the headstock and turning centers on the market. The next part deals with choice of cutting conditions and calculation of spindle parameters. These calculations are verified using the FEM method. Based on the calculations and design requirements, a headstock model with drawing documentation is created.

The thesis deals with headstock and spindle of the universal turning center. In the introduction part is a destription of the headstock morfology. It describe how the spindle and headstock can be solved in terms of its bearing, installation, used clamping interface, lubrrication, cooling and sealing. The second part is devoted to the universals turning machines which are available on the market. In the final part is the practical solution of the headstock and spindle on which can be performed for milling and drilling operation instead of turning.

The thesis deals with the design of a headstock for a small lathe. The first part of the thesis deals with the description of individual structural nodes related to the construction of machine tools headstock. The second part includes an overview of similar machines available on the market. The final part deals with the calculation of necessary parameters, the verification of results using the finite element method and the construction of the proposed headstock. Based on the designed construction is created 3D model and drawing documentation.

The subject of this diploma thesis is the conceptual design of a mobile lathe centre with a vertical workpiece axis. First, a search in the field of mobile lathes, stationary lathes and methods of their transport is performed. Then, from the described transport machine options, the most suitable transport variant is selected, thanks to which variants of the mobile machine solution are created. Subsequently, the design of the winning variant is fully adapted to the method of transport using containers. Emphasis is placed on simple construction, maximum use of the transport packaging in the machine frame and easy assembly of the machine customer. For these reasons, the machine frame must consist of two containers. Finally, the assembly and adjustment of the machine tool are solved in combination with the verification of the functionality of the proposed concept.

The subject of this thesis is the proposal of constructional solution for pallet changer of the vertical machining center. This pallet changer serves for the manipulation with technological pallets between dilatory places of the machining center and charger of pallets. Thanks to this changer the machines share one workpieces´ base. Main accent is not put only on the function but also on the low price of this solution.

his Disertation thesis involves the creating of the simulation model of the C axis drive over mentioned machine and them verification on the prototype of this machine. C axis is controlled with position feedback. Simulation model was created before the realisation of the machine prototype for the preliminary identification of the dynamic behaviours in the working cycles and them opportunity of the realisation this conception. C axis is constructed with worm gear and is controlled with help of Master-Slave drive. This torque drive eliminates the production backlash in the worm gear. The multifunction turning center, where is used this C axis, is determinate for heavy duty roughing cutting of the forged peaces, where is problem with dynamic stability of the cutting process. Simulation model includes the problems with multi-body mass system, friction on the worm gear, self locking, damping on the worm gear and the optimization of the parametrs for many regulators. Simulation model was verified on the prototype of the machine. Achieved results bring the new knowledge, which are used for simulation complicated machine nodes and this knowledge is used for research and developing of the similar mechatronics system.