Modern Machinery (MM) Science Journal, June 2013

DETERMINATION OF PARAMETER Ra FOR THE METHODS OF FINISHING MACHINING

Rastislav Bartos, Augustin Gorog
Keywords: phase composition | adhesion | residual stresses | roughness | plasma spraying | ceramic coatings

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 th (…)

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

Kamil Kolarik, Zdenek Pala, Libor Beranek, Nikolaj Ganev
Keywords: phase composition | adhesion | residual stresses | roughness | plasma spraying | ceramic coatings

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 (…)

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

Zdenko Gunis, Augustin Gorog
Keywords: coordinate measuring machine. | moment | groove | flatness

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 PROPOSAL OF THE CLASSIFICATION SYSTEM FOR PARTS PRODUCED BY CNC MACHINES

Vladimir Simna, Peter Pokorny
Keywords: basis function | CAPP | inverse kinematic | features | classification

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 represen (…)

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

Stefan Vaclav
Keywords: beta symmetry | alpha symmetry | vibrational orientation | theory of orientation | grade symmetry | design for assembly

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 componen (…)

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

Ivan Baranek, Ivan Buransky, Jozef Peterka
Keywords: dynamic model | 3D scanning | milling | chatter | thin-walled part

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 (…)