Modern Machinery (MM) Science Journal, October 2019

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

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

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 (…)

OPTIMISATION OF SERVICE CAPACITY BASED ON QUEUEING THEORY

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

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: force loading. | end milling | PCD | Ti-6Al-4V | chipbreaker | laser technology

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 (…)

MEASUREMENT UNCERTAINTY SIMULATION BY MONTE CARLO METHOD IN NANOMETROLOGY

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

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 (…)

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: testing. | shear strength | polybutylene terephthalate (PBT) | polyamide 6 (PA6) | recycled plastic | bonded joints

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 (…)

MACHINING ACCURATE HOLES WITH REQUIRED ROUGHNESS

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

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 (…)

TOPOLOGICAL OPTIMIZATION OF THE FORMULA STUDENT BELL CRANK

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

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

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 (…)

APPLICATION OF DATA GLOVE FOR ASSEMBLY ANALYSIS OF SELECTED COMPONENT

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

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 (…)

INCREASE OF PRODUCTION PRODUCTIVITY USING THE COMBINED MACHINING IN ONE CLAMPING

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

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 (…)