Modern Machinery (MM) Science Journal, December 2014

COMPARISON OF MACHINING INCONEL 718 WITH CONVENTIONAL AND SUSTAINABLE COOLANT

David Fernández, Virginia García Navas, Alejandro Sandá, Ion Bengoetxea
Keywords: turning | inconel | Machining | Keywords: cryogenic

The use of super-alloys, most of them Ni- or Ti-based, has significantly increased during the last decade. Industries such as the aerospace,energy or transport, use these kinds of materials due to their excellent properties that combine hardness, high temperature strength and thermal shock and corrosion resistance. These desirable material properties make these alloys extremely difficult to machine, sin (…)

HIGH SPEED GEAR HOBBING WITH CEMENTED CARBIDE HOBS

B. Karpuschewski, M. Beutner, M. Wengler, M. Köchig
Keywords: fly cutting | wear behavior | cemented carbide | gear hobbing

As dominating manufacturing process to create external gears, hobbing is of major industrial importance. Hence, a continuous process optimisation to satisfy the demand of the market is necessary. Changing the substrate material is a basic approach in optimization of operation times. Due to acquisition costs and lacking knowledge most companies hesitate to use cemented carbide hobs which endure higher cu (…)

FINITE ELEMENT MODELING OF THE ORTHOGONAL MACHINING OF PARTICLE REINFORCED ALUMINUM BASED METAL MATRIX COMPOSITES

Usama Umer, Mohammad Ashfaq, Jaber Abu Qudeiri, Hussein Mohammed Abdalmonaem Hussein, Abdul Rahman Al-Ahmari
Keywords: cohesive zone modeling (CZM) | metal matrix composites (MMC) | Keywords: finite element models (FEM)

2D finite element models (FEM) are developed to simulate orthogonal machining of particle reinforced aluminum based metal matrix composites (MMC). The models predict cutting forces, chip morphology, temperatures and stresses distributions. The simulations were carried out by developing a fully coupled temperature displacement model. In contrast to the equivalent homogeneous material (EHM) methodology, a (…)

THE PERFORMANCE OF STIRLING ENGINE OF THE FREE PISTON TYPE ENHANCED WITH SiC CERAMICS HEATER

Akazawa Teruyuki, Hirata Koichi, Hoshino Takeshi, Fujiwara Kazuhito
Keywords: heater efficiency | silicon carbide | ceramics heater | free piston stirling engine | stirling engine

Free piston Stirling engines with integrated linear alternators have the compact size and high conversion efficiency for the sake of the simplicity of mechanical movements. These engines have been developed with the conversion efficiency of 25 %. The material property of ceramics heater is critical in order to achieve such high efficiency. In this paper, the successful design process of the ceramics hea (…)

DEVELOPMENT OF FORCED COOLING USING MIST OF STRONG ALKALINE WATER FOR RESTRAINING THERMAL DEFORMATION ON A MACHINE TOOL

Ikuo Tanabe
Keywords: mist | strong alkaline water | water evaporation | forced cooling | thermal deformation | Machine tool

In this research, forced cooling using mist of strong alkaline water for restraining thermal deformation on a machine tool was developer and evaluated. There are the corrosion resistance of several materials without aluminum, copper and their alloys in alkaline water. Thermal deformations of the bench lathe were effectively restrained by mist of strong alkaline water. When mist of alkaline water was use (…)

HIPIMS COATED CARBIDES WITH HIGH ADHESIVE STRENGTH FOR HARD MACHINING

Bartek Stawiszynski, Eckart Uhlmann, Christoph Leyens, Stefan Heinze
Keywords: wear tests | hard coatings | HiPIMS | turning | hard processing

Hard processing is defined as the machining of ferrous materials with a hardness of at least 50 HRC. Due to the possibility of the substitution of grinding processes, hard processing has grown in importance in recent years. Fundamental to this was the development of heat and wear resistant cutting materials. The turning of hardened steel is currently possible with cubic boron nitride and ceramic tools, (…)

DESIGN OF PISTON RING SURFACE TREATMENT FOR REDUCING LUBRICATING OIL CONSUMPTION

Junya Tanaka
Keywords: oil consumption | lubricating oil | surface treatment | piston ring | design

The reduction of lubricating oil consumption in the internal combustion engines is important for clearing the emission standard and environmental problem, especially the hydrocarbon and particulate matter [Furuhama 1962, Harigaya 2010, Suzuki 2006]. Recently, it is reported that lubricating oil which exist near the piston ring or piston crown effects strongly for occurrence of pre-ignition in highly su (…)