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 (…)
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 (…)
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 (…)
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 (…)
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, (…)
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 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 (…)
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