MM Science Journal, October 2019

MEASUREMENT UNCERTAINTY SIMULATION BY MONTE CARLO METHOD IN NANOMETROLOGY

Jan Sramek, Robert Jankovych
Keywords: coordinate measuring machine | measurement uncertainty | length measurement | multi-position method | substitution method | Monte Carlo method | nanometrology | ruby ball.

This paper deals with the determination of uncertainty and individual contributions to the measurement uncertainty on the CMM SIOS NNM-1 instrument fitted with the touch-probe scanning system Gannen XP. Manufacturer SIOS designates this machine as nano-CMM. Two non-simulation methods to determine the measurement uncertainty, the substitution and multi-position methods are addressed in detail [Sramek, Ja (…)

INCREASE OF PRODUCTION PRODUCTIVITY USING THE COMBINED MACHINING IN ONE CLAMPING

Ladislav Fuglicek
Keywords: CNC machine | conventional machine | Machining | shaft | production.

The Study is focused on machining of complex components in one clamping. Two methods of machining are discussed herein, with conventional machines and a multifunctional machine. The study compares the design solution of both machines as well as elements with the potential to improve the efficiency of production. Machining using conventional machines is very time-demanding, not only with regard to the ma (…)

APPLICATION OF DATA GLOVE FOR ASSEMBLY ANALYSIS OF SELECTED COMPONENT

Naqib Daneshjo, Albert Mares, Erika Dudas-Pajerska, Enayat Danishjoo
Keywords: Manual assembly | process analysis | CAD program | Virtual Reality | RULA analysis | CATIA | data glove

The aim of this work is to analyze the assembly of a selected component using Cyber Glove II data glove and CATIA V5 program using Rapid Upper Limb Assessment analysis (RULA). The RULA analysis is mainly used in the evaluation of work positions performed by workers in manual work such as assembly and disassembly. The RULA analysis assesses the individual states of posture, strength and muscle activit (…)

TOPOLOGICAL OPTIMIZATION OF THE FORMULA STUDENT BELL CRANK

Jakub Mesicek, Marek Pagac, Jana Petru, Petr Novak, Jiri Hajnys, Kristyna Kutiova
Keywords: topological optimization | bell crank | suspension | 3D printing | metallic powder.

This paper focuses on the topological optimization of the Formula Student bell crank. Modern trends in designing are weight reduction, and due to this, also reduction in fuel consumption. Topological optimization allows modification of the shape of the component in respect to the strength demand and the boundary conditions of component loading. The topological optimization software with respect to comp (…)

PLASMA OVERLAY WELDING OF COBALT ALLOY

Marian Sigmund
Keywords: Cobalt alloy – Stellite | creep resistant steel | overlay welding | plasma transfer arc (PTA) welding | valve seat | metal powder | preheating | Hardness | pWPS | WPQR | WPS.

This article describes the overlay welding of a cobalt alloy. This overlay is made by the plasma transfer arc (PTA) welding technology. Cobalt alloy is overlaid on a creep resistant steel as the seat of a high-pressure steam valve. High-pressure steam valves are used in the energy, nuclear, petrochemical, oil, gas and pharmaceutical industries. Creep resistant high alloy steels are weldable with proper (…)

INFLUENCE OF RECYCLED PA6 AND PBT PLASTIC MATERIAL ON THE BONDING STRENGTH

Gabriel Dittrich, Luboslav Straka, Frantisek Botko, Jan Duplak, Jaroslav Bircak, Fahad Aldaihan
Keywords: bonded joints | recycled plastic | polyamide 6 (PA6) | polybutylene terephthalate (PBT) | shear strength | testing.

Nowadays, due to the requirement to achieve specific product properties or to reduce the weight of machine parts, conventional metal materials are replaced by plastics. Various methods are used to connect them to assemblies. The task of the joint is to provide a perfect, but particularly reliable, compact unit. One of the relatively effective methods of bonding plastic parts is their bonding. In additio (…)

OPTIMISATION OF SERVICE CAPACITY BASED ON QUEUEING THEORY

Michal Dorda, Dusan Teichmann, Vojtech Graf
Keywords: Service capacity | optimisation | queueing theory | Simulation | coloured Petri nets | Matlab | CPN Tools

Queueing theory is a mathematical tool which can be applied for capacity planning and optimization of production, manufacturing or logistics systems. One of the possible applications of queueing theory is service capacity optimization. Let us consider that an engineering company operates m homogeneous machines. We assume that the machines are successively operating and down and times between failures (…)

END MILLING OF Ti-6Al-4V ALLOY BY PCD INSERTS WITH LASER-MACHINED INTEGRAL CHIPBREAKER

Tomas Trcka, Jakub Palovcik, Ales Polzer, Frantisek Soukal
Keywords: laser technology | chipbreaker | Ti-6Al-4V | PCD | end milling | force loading.

Polycrystalline diamond (PCD) is becoming more available cutting material due to developing technologies, but it is still one of the difficult-to-cut materials. Nowadays, sharpening of diamond inserts is usually performed using unconventional machining methods, where the high hardness of the material is not a deciding factor. Apart from electrical technology (WEDM or EDM-G), PCD is also sharpened by las (…)

CROSSHEAD SPEED EFFECTS ON FERRO CASTING DUCTILE (FCD) TENSILE STRENGTH AND FAULT MORPHOLOGY

Andoko Andoko
Keywords: Nodular Cast Iron | tensile strength | and Fault Morphology

Nodular cast iron or Ferro casting ductile (FCD) is the developmental result of grey cast iron. Nodular cast iron has mechanical properties similar to carbon steel, which are better than the mechanical properties of grey cast iron. The 1.5 mm/s crosshead speed created a tensile strength of 549.8 N/mm2. It gradually declined to 401.4 N/mm2 at 4.5 mm/s and 302.6N/mm2 at 9 mm/s. Differentiation in strain r (…)

MACHINING ACCURATE HOLES WITH REQUIRED ROUGHNESS

Pavel Dostal, Marek Sadilek, Radek Hruby
Keywords: Machining | tools | roughness | precise holes | machining parameters

The knowledge gained from the theoretical and practical tests in the production of precise openings has been utilized in a wide range of technologies from simple machine parts to complex schemes requiring accurate placement of individual parts. The topic here deals with the production of precise holes of required roughness according to the customer's requirements, it is a sealing of hydraulic cubes with (…)