International Journal of Precision Engineering and Manufacturing-Green Technology
In this work, effect of inductance was investigated in micro EDM using high frequency bipolar pulse generator used for electrolytic corrosion prevention in deionized water. To understand behaviors of the pulses during machining according to inductance, capacitor voltage which is equal to gap voltage and inductor current were analyzed both theoretically and experimentally. Inductance affected the pulse...
This paper presents a novel energy-saving method of a robotic system utilizing parallel mechanism by redundant actuation. The redundantly actuated system can distribute arbitrary actuating torques in a certain combination. By using this feature, the regenerative power dissipation and electric power loss are reduced. Moreover, the redundant actuation can reduce the peak torque of actuating joints....
Chemical mechanical polishing (CMP) is currently replacing a conventional chemical etching or mechanical polishing to remove overburdened copper deposit in printed circuit board (PCB) manufacturing process owing to its ability to realize a global planarization. In order to stabilize the CMP as one of the PCB manufacturing processes, the CMP machine has been investigated. This paper introduces a newly...
The mechanical properties of metals change temporarily or permanently under application of electric currents under deformation. This phenomenon is often referred to as electroplasticity. The electroplasticity of metals and their alloys has been investigated under various loading conditions including tensile, compressive, bending, and hardness tests. Electrically-assisted manufacturing (EAM) utilizes...
The Green Mark eco-label constitutes an essential program introduced by Taiwan’s Environmental Protection Administration to support environmental protection. In the manufacturing industry, the Green Mark eco-label is intended to enable differentiating between manufacturers that apply green processes and those that do not. This paper presents an assessment model for identifying manufacturers’ initial...
Recently, the attempt to decrease greenhouse gases, noxious gases and utilized energy sources has emerged as a crucial issue in the world to manage problems of global warming, resource depletion and air pollution. Institutes, universities and industries related to transport vehicles have endeavored to solve these crucial problems through the reduction of the overall weight of transport vehicles. However,...
Cu based metal-organic decomposition (MOD) ink has been preferred as a printable conductive material in the field of printed electronics because it can mitigate the formation of undesired Cu oxide or precipitation of the metal source during storage and printing. However there will be oxidation of Cu during sintering process in air environment, for fabrication of conductive track from printed ink....
Micro-manufacturing is one of the growing technologies of near future. Non-traditional machining processes have been found to be beneficial for micro manufacturing using low density of energy for metal removal. To overcome environment related problems of chemical machining, biomachining has been developed over several years by making use of the metabolic activity of microorganisms. Besides many advantages...
This study aims to develop a durability test procedure for vibration-based energy harvesters in the frequency domain. First, we investigated the vibration environment of a structure on which an energy harvester may be installed and determined the level and frequency range of the power spectral density (PSD) exerted on the energy harvester. Consequently, we developed a test procedure, which is composed...
Rotary swaging is an incremental cold forming process and allows for the cost effective manufacture of cylindrical light weight components such as rods or hollow shafts. The process has a widespread use particularly in the automotive industry for example for the manufacture of axles and steering spindles. Besides the generation of desired geometries, rotary swaging offers the advantage of improved...
Printed electronic circuits are becoming increasingly employed in flexible electronics such as radiofrequency (RF) antenna modules and organic solar cells. To achieve a high-efficiency module, very thin and small electrodes need to be produced with high throughput. This work reports on a heating roll design for the roll-to-roll (R2R) thermal imprinting process. Due to non-uniform thermal deformation...
Nanothin and pinhole-free electrolyte-embedded solid oxide fuel cells (SOFCs) on nanothin bottom electrode catalyst-coated anodic aluminum oxide (AAO) substrates with 20 nm and 80 nm-sized nanopores are morphologically and electrochemically characterized to identify the substrate-dependent nanostructuring effects. Reliable electrolytes were fabricated through the application of a protective layer...
Environmentally conscious manufacturing (ECM), a key concept for modern manufacturing, emphasizes the efficient and optimal use of raw materials and natural resources and minimization of the negative effects on nature and society. This study focused on achieving ECM for milling processes. Toward this end, a model predicting the specific cutting energy was developed and optimized to determine the cutting...
The multifactorial erosion was conducted in this paper to test the compressor impeller material FV520B using high-speed gas-solid two phase flow erosion tester and surface morphology analysis method. Based on the particle motion and collision energy equation as well as regression analysis of multi-factor orthogonal experiment, a phenomenological erosion depth model which captures the effects of impact...
The objective was the development of an energy harvester for the hot-box detector of the HEMU-430 project high-speed train in Korea. In this study, we attempt the development of energy harvesters that incorporate a monitoring system in the train wheel bearing. We verified the use of electromagnetic induction as an effective method for harvesting energy from low-frequency vibration through the environmental...
In this paper, we have studied the CMP characteristics of mixed abrasive slurry (MAS) retreated by adding of ceria abrasives within 1:10 diluted silica slurry (DSS). We focused on how these mixed ceria abrasives affect the material removal in order to determine the optimal recipe conditions through the correlation between the mixed contents of ceria abrasives and CMP performances. The slurry designed...
The remanufacturing of machine tools is a complex approach to regain the original identity, accuracy, and precision of faulty machine tools in order to save time, money, and natural resources. Despite its great importance, the process is not yet fully standardized, and every industry has its own policy to remanufacture their machine tools. This may be due to the fact that machine tools remanufacturing...
Spheroidizing annealing cycle was applied on the SNCM 220, which is an alloy steel for mechanical structures to improve warm forgeability. Heat treatment was given on the specimen, filled with Ar gas to prevent oxidization. Spheroidizing microstructure was examined in the specimens received the intercritical cycle, measured the largest elongation rate during mechanical properties evaluation. And,...
Cold start-up conditions differ from the normal operating conditions for an engine, and this discrepancy adversely affects the tribological performance of interfaces. The majority of health-hazardous engine exhaust emissions occur during the cold start-up of an engine; consequently this condition generates a major environmental concern. This study numerically investigates the transient hydrodynamic...
In this study, structural analysis for the seat frame of automotive was carried out using finite-element analysis (FEA) technique and comparative analysis of the designs of lightening method, while not degrading the strength and stability of the frame. Maximum equivalent stress and maximum deformation amount on the whole seat frame were analyzed by employing the loading condition of passengers on...