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With growing concern over environmental problems, green technologies associated with reducing pollution have been rapidly progressing to attain a sustainable future. Among numerous green technologies currently under development, water lubrication technology that can replace the use of conventional oil lubricants can be a promising technology that may lead to huge benefits with respect to environmental...
The present work proposes to use ultrasonic vibration energy for polymer sheet forming. Polymer sheets are usually formed by the thermoforming process, in which a polymer sheet is heated and softened in order to be shaped into desired part. In this work, instead of the thermal energy used in the conventional thermoforming process, the energy of ultrasonic vibration was used to soften a polymer sheet...
Today, the manufacturing industry is aiming to improve competitiveness through the convergence with cutting-edge ICT technologies in order to secure a new growth engine. Smart Manufacturing, which is the fourth revolution in the manufacturing industry and is also considered as a new paradigm, is the collection of cutting-edge technologies that support effective and accurate engineering decision-making...
The base vibration of a linear motor motion stage has been reduced with a passive reaction force compensation (RFC) mechanism based on a movable magnet track and springs. This paper presents the design procedure of an eddy-current damper (ECD) type RFC mechanism for a linear motor motion stage. The RFC mechanism with a movable magnet track and an ECD can overcome the disadvantages of the spring based...
A stainless steel material is used as components for storing hydrogen gas and liquid hydrogen, or for transportation raw material and oil in storage container. Brittle fracture associated with hydrogen is observed for stainless steel and these phenomena of hydrogen embrittlement were very important for wide-ranging application of stainless steel. Many researchers have studied the hydrogen embrittlement...
Remanufacturing is one of the critical elements moving our economy toward one that is circular. Today, remanufacturing is attracting growing attention worldwide. Meanwhile, despite its potential in terms of its effects on both environment and economy, remanufacturing has not yet been sufficiently exploited. This indicates that there exist both drivers for and barriers to an increase in remanufacturing...
The most important design factors in the life of a pitch reducer for a wind turbine are the load distribution on the contact surface of the gear teeth and load sharing among the planet gears. The effects of the output shaft bearing of the pitch reducer of a wind turbine on the load distribution and load sharing were analyzed in this study. Using commercial software, four pitch reducer models with...
Several industries including the automotive industry have recently applied the process of welding high-strength steel for their requirements. Ultra-high-strength steel is harder than normal high strength steel; it is considerably much stronger and stiffer. In particular, ultra-highstrength steel (UHSS) can be formed in pieces that can be up to 10 to 15% thinner than normal steel without sacrificing...
Electrically-Assisted manufacturing is a promising hybrid manufacturing process for improved ductility and elongation during plastic deformation of metals and decreased spring-back. Most studies have focused on the deformation of a whole material by applying electric current through the whole material, and many electrically-assisted manufacturing processes including forging, rolling, and sheet metal...
In this communication, we have introduced bioinspired polymeric dry adhesive structures made by using low-expertise yet robust over-etching fabrication process and chemical treatment method. The structure of gecko-foot in nature has been adopted into various applications for its remarkable smart adhesion performance. Although a lot of methods have been proposed to fabricate the gecko-inspired dry...
Hydrothermal growth of zinc oxide (ZnO) nanowire (NW) enables a facile synthesis of versatile 1D nanostructure, but the conventional bulk heating procedure is assessed to be unsuitable for microsensor application in terms of selectivity and power consumption. In this study, we introduce selective electro-thermal growth of ZnO NW on photolithographically patterned electrode in the liquid environment...
Chemical mechanical polishing (CMP) technology has been newly applied in printed circuit board (PCB) field for satisfying requirements from miniaturization of mobile devices. This paper focuses on the complexing agent to increase the removal rate for thick Cu layer. In order to find out optimum type and concentration of the complexing agent, experiments have been done in terms of electrochemical analysis,...
Main advantages of cold forging are improvement of mechanical properties, excellent dimensional accuracy, and surface quality. Hot forging is a processing of plastic deformation for the metal at recrystallization temperature or higher. It is possible to decrease the flow stress and energy required to form the material at elevated temperature. Complex forging for combining cold forging and hot forging...
Increasing the energy efficiency of manufacturing processes is one of the many ways to reduce manufacturing cost and to resolve environmental issues. This paper systematically investigates the manufacturing process of an automotive crankshaft via a numerical simulation approach towards energy savings. The aim of this work is to propose potential solutions for improving the energy efficiency of the...
As a novel method for fast depth profile analysis of Cu (In, Ga) Se2 (CIGS) thin film solar cell, laser induced breakdown spectroscopy (LIBS) is introduced, and the effects of laser wavelength on depth resolution are investigated. From LIBS analysis of a commercial CIGS solar cell using an ultraviolet (λ = 266 nm) and a visible (λ = 532 nm) nanosecond Nd: YAG lasers and an intensified charge-coupled...
Performance improvement of a thin film lanthanum strontium cobalt iron oxide (La0.6Sr0.4Co0.8Fe0.2O1-δ, LSCF) cathode deposited by pulsed laser deposition (PLD) was achieved by utilizing a sputtered gold (Au) film as a current collecting layer. To improve low inplane electric conductivity of the porous LSCF film due to its columnar structure, fabrication of the well-connected and porous current collector...
Manufacturing paradigms have historically been shaped by social, economic, and technological aspect, including limitations and needs. Design for manufacturing (DFM) has been the main paradigm for last three decades since design is defined by the limitations of available manufacturing processes. Since reducing the time required for the development of new products has been one of the key issues for...
Laser-Assisted milling is a type of thermally-assisted machining process in which a workpiece is locally softened by a laser heat source before machining. This method is effective solution for machining materials such as Inconel series alloys, titanium alloy, and ceramics, which are more difficult to machine compared with conventional materials. It is also a green machining process, because it saves...
Alumina (Al2O3) has gained attention as an attractive structural ceramic material because of exceptional oxidation resistant, wear resistant and high strength under environment of high temperature. In this paper, a high-density (Up to 95%) graphene nanoplatelet (GNPs)/Al2O3 ceramic composite instead of non-conductive monolithic Al2O3 was fabricated by the spark plasma sintering method. Material properties...
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