June 2013

These papers were presented at 5th International Conference Manufacturing Technology 2013, Pilsen

APPLICATION OF X-RAY DIFFRACTION IN DEVELOPMENT OF NEW TYPE OF MOULDS FOR PRODUCTION OF REFRACTORY AND HIGHLY ABRASIVE OBJECTS

MM (Modern Machinery) Science Journal, June 2013
 
Kamil Kolarik 1 , Zdenek Pala 1 , Libor Beranek 2 , Nikolaj Ganev 1
1 Department of Solid State Engineering,
Faculty of Nuclear Sciences and Physical Engineering,
CTU in Prague, Prague, Czech Republic
2 Department of Manufacturing Technology,
Faculty of Mechanical Engineering,
CTU in Prague, Prague, Czech Republic
e-mail: kamil.kolarik@email.cz
Abstract

Ceramic materials can be used due to their high hardness and chemical stability as both the wear and corrosion resistant coatings. Their deposition on moulds for manufacturing of objects from refractory and highly abrasive materials is challenging, because they are traditionally made from hard-to-blast case-hardened tool steels with hardness exceeding 60 HRC. The pressing process imposes further stringent requirements on the coating microstructure; especially in respect to its homogeneity, cohesion and wear resistance. Considering results of laboratory analyses of residual stresses and roughness of blasted surfaces, mould plates from low-carbon C45 steel were sprayed with five different ceramic materials by water stabilized plasma gun. The testing of the moulds with plasma coatings was performed on-site in a factory under standard pressing conditions.

Keywords: ceramic coatings, plasma spraying, roughness, residual stresses, adhesion, phase composition

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INFLUENCE OF MATERIAL REMOVAL WAY ON THIN-WALLED PART QUALITY BY MILLING

MM (Modern Machinery) Science Journal, June 2013
 
Ivan Baranek, Ivan Buransky, Jozef Peterka
Faculty of Materials Science and Technology
Slovak University of Technology in Bratislava
Institute of Production Technology
Trnava, Slovak Republic
e-mail: ivan.baranek@stuba.sk
Abstract

The article is focused on research of influence of material removal way on thin-walled part quality by milling. There were chosen three ways of material removal. Rib parts produced using these various ways of material removal showed different quality of surface already on visual inspection. To quantify the dimensional deviation of parts these were scanned by GOM ATOS 1350 and compared to CAD models. The results are colour deviation maps that showed suitability alternatively non-suitability of some of the ways of material removal and also influence of cutting environment on the quality of parts produced some of these ways.

Keywords: thin-walled part, chatter, milling, 3D scanning, dynamic model

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DETERMINATION OF PARAMETER Ra FOR THE METHODS OF FINISHING MACHINING

MM (Modern Machinery) Science Journal, June 2013
 
Rastislav Bartos, Augustin Gorog
Slovak University of Technology,
Faculty of Materials Science and Technology in Trnava,
Institute of Production Technologies, Department of Machining,
Assembly and Forming
Trnava, Slovak Republic
e-mail: rastislav.bartos@stuba.sk
Abstract

Theoretical determination of surface roughness Ra parameter for methods of machining tool with undefined geometry is complex. Paper presents an analysis of possible relationships to calculate the roughness parameters Ra finishing with rotating parts. Based on the selection of variables involved, wanted variables and factors to establish differential equation. The equation contains in addition of the factors also the constant, which must be established experimentally. For this case, it is appropriate to use the method of planned experiment, which would be extended to a new method for determining of various mathematical relations for Ra. The presented methodology can be applied to the determination of Ra with other methods of finishing machining, especially with the grinding.

Keywords: ceramic coatings, plasma spraying, roughness, residual stresses, adhesion, phase composition

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THE IMPACT OF CLAMPING ON THE RESULT OF MEASUREMENT OF GEOMETRIC PRECISION OF COMPONENTS

MM (Modern Machinery) Science Journal, June 2013
 
Zdenko Gunis, Augustin Gorog
Institute of Production Technologies
The Faculty of Materials Science and Technology in Trnava,
Slovak University of technology. Slovak Republic
e-mail: guniszdenko@gmail.com
Abstract

The quality of cutting tools directly affects the quality of machined components. However, it can indirectly affects also the quality of components which are not machined. The errors of machined forms can be transferred to the plastic components which are produced by injection. This article deals with the flatness of groove on this kind of component which is a part of the pump on the motor vehicle. The groove has an important functional role. The control of the flatness is carried out under the conditions, which are identical to the conditions of operation – a component is in the operating conditions clamped by the screws in the exactly determined moment. There fore, it is necessary to determine what influence has the moment of the screws on the final value of the flatness of the groove. The influence of the moment was examined in the time range from 5 to 25 Nm on the five components, which were produced by the same technology. The measurements of flatness were performed on the coordinate measuring machine.

Keywords: flatness, groove, moment, coordinate measuring machine.

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THE PROPOSAL OF THE CLASSIFICATION SYSTEM FOR PARTS PRODUCED BY CNC MACHINES

MM (Modern Machinery) Science Journal, June 2013
 
Vladimir Simna, Peter Pokorny
Slovak University of Technology, Faculty of Materials Science
and Technology in Trnava, Institute of Production Technologies,
Department of Machining and Assembly
Trnava, Slovak Republic
e-mail: peter_pokorny@stuba.sk
Abstract

This paper deals with the design of the classification system which task will be component classification from view of manufacturability by CNC machines. Each component can be described by distributi on and orientation features and surfaces witch located in the component, but it is also necessary to take into account what relations exist between these elements. For the purposes of computer representations of CNC machine seems to be most efficient solution describe the kinematic characteristics by mathematical formulas which clearly define the option of the kinematics of CNC machine. These data can be processed by the theory of forward or inverse kinematics.

Keywords: classification, features, inverse kinematic, CAPP, basis function

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THE METHODOLOGY FOR CALCULATING THE DEGREE OF COMPLEXITY OF THE PARTS ORIENTATION IN VIBRATION TRAYS

MM (Modern Machinery) Science Journal, June 2013
 
Stefan Vaclav
Slovak University of Technology,
Faculty of Materials Science and Technology in Trnava,
Institute of Production Technologies,
Department of Machining and Assembly
Trnava, Slovak Republic
e-mail: stefan.vaclav@stuba.sk
Abstract

The material from which the part is created has a decisive influence on the complexity and laboriousness assembly. Parts are still mostly delivered to assembly in disordered, chaotic state. The first theoretical work was focused on development of shape classifiers and sample solutions of automated orientation appropriate shape groups. Some works have appeared attempts for classification of components according the symmetrical. The most important assembly property of solid components from view of orientation is degree of symmetry. In this paper the developed methodology for calculating the degree of complexity of parts orientation in the case of parts orientation in vibratory tray.

Keywords: design for assembly, grade symmetry, theory of orientation, vibrational orientation, alpha symmetry, beta symmetry

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