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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Manufacturing Technology Engineers
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The Korean Society of Manufacturing Technology Engineers
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Volume & Issues
Volume 25, Issue 4 - Aug 2016
Volume 25, Issue 3 - Jun 2016
Volume 25, Issue 2 - Apr 2016
Volume 25, Issue 1 - Feb 2016
Selecting the target year
Development of Automatic Tool Changer of SMA Tool Holder
Lee, Sungcheul ; Ro, Seung-Kook ; Park, Jong-Kweon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 1, 2016, Pages 1~6
DOI : 10.7735/ksmte.2016.25.1.1
Micromanufacturing is a useful system for reducing energy consumption. For micromanufacturing, tool clamping and workpiece clamping are important components to realize the machining process. Therefore, a shape memory alloy (SMA) ring type tool holder is developed. In addition, this holder needs cooling and heating processes to execute the tool clamping process. This study suggests a cooling/heating device based on peltier elements. The device will be applied to the heating/cooling process of an automatic tool changer (ATC) for the SMA tool holder. This study introduces the configuration and operating principle of the proposed ATC system. The description and prototype evaluation of this system were given. Plastic bolt and aluminum block were selected to enhance the cooling performance, and the installed tool was changed in 17 s during the experiments.
Overhead Rigid Conductor and Transition Structure for High-Speed (Over 250 km/h) I : Structural Design
Kim, Bong-Suk ; Won, Yong-Hee ; Park, Seol-Hee ; Bae, Sang-Joon ; Jang, Kwang-Dong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 1, 2016, Pages 7~13
DOI : 10.7735/ksmte.2016.25.1.7
With the increasing running speed of trains, new railway lines in metropolitan areas, and the rising demand for green transportations, the number of underground and tunnel sections are constantly becoming larger, and installations of overhead rigid conductor systems are becoming wider. However, domestic commercial products for overhead rigid conductors are limited to 120 km/h train speeds. In this study, to develop a high-speed (250 km/h) overhead rigid conductor, R-Bar (Rigid Bar), the electrical and mechanical stability was enhanced through the improvement of the cross sectional shape of the R-Bar; the transition structure was also designed for flexibility and natural frequency isolation. In addition, the evaluation of contact forces between a pantograph and the overhead rigid conductor system for 250 km/h train speeds was performed using dynamic analysis.
Green Photoresist Stripping Process with the Influence of Free Surface from Dip Withdrawal
Kim, Joon Hyun ; Kim, Seung Hyun ; Jeong, Byung Hyun ; Joo, Gi-Tae ; Kim, Young Sung ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 1, 2016, Pages 14~20
DOI : 10.7735/ksmte.2016.25.1.14
This paper describes a green stripping process to effectively strip the remaining DFR layer on a non-alkali-based ITO glass surface after an etching process. A stripper, water-soluble amine compound, is used to investigate the characteristics of stripping ability and to suggest a valid method for the green process. Increasing the composition (5-30% concentration) of the ethanol amine-based stripper was found to greatly reduce the stripping time applied in the dipping method. The composition (30%) achieved an excellent stripping effect and free-residue impurities. Additionally, it was possible to obtain the effect of stripping in a way to sustain the release before generating DFR sludge from the ITO glass surface by using dipping condition (stripping time) in the composition. An Additional stripping process (buffering) out of dipping can realize productivity improvement and cost reduction because of the higher proportion of re-use of the stripping solution used in the DFR removal step.
Contact Fatigue Strength Design of a Slewing Bearing Based on i-PGS
Kwon, Soon-man ; Shin, Heung Chul ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 1, 2016, Pages 21~29
DOI : 10.7735/ksmte.2016.25.1.21
To overcome the large ring gear manufacturing problems seen in slewing bearings and girth gears, pin gear drive units have been developed. Among them, a novel slewing bearing with an internal pinwheel gear set (i-PGS) is introduced in this paper. First, we consider the exact cam pinion profile of i-PGS with the introduction of a profile shift coefficient. Furthermore, a new root relief profile modification for the i-PGS cam pinion is presented. Then, the contact stresses are investigated to determine the characteristics of the surface fatigue by varying the shape design parameters. The results show that the contact stresses of i-PGS can be reduced significantly by increasing the profile shift coefficient. In addition, the contact ratio, a measure of teeth overlapping action, decreases with the decrease of the allowable pressure angle.
Prediction of the Top-bead width of Tandem GMA Welding Processes Using the STACO Model
Lee, Jong Pyo ; Park, Min Ho ; Kim, Do Hyeong ; Jin, Byeong Ju ; Son, Joon Sik ; Kang, Bong Yong ; Shim, Ji Yeon ; Kim, Ill Soo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 1, 2016, Pages 30~35
DOI : 10.7735/ksmte.2016.25.1.30
Tandem arc welding is a guarantor for high efficiency and cost saving since the quantity of wire which is deposited in the welding is approximated 30% greater that in conventional welding. The welding process is now being successfully applied in many industries. However, in the case of tandem arc welding, good quality and high productivity should depend on the welding parameters. Therefore, an intelligent algorithms for the automatic tandem arc welding process has been necessarily required. In this study, a predictive model based on the neural network by using the data acquired during tandem gas metal arc (GMA) welding process has been developed. To verify the reliability of the developed predictive model, a mutual comparison with the surface of the top-bead width obtained from actual experiments has been analyzed.
Improvement of Reproducibility in Selective Electrodeposition Using Laser Masking and DC Voltage
Shin, Hong Shik ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 1, 2016, Pages 36~41
DOI : 10.7735/ksmte.2016.25.1.36
A method is proposed for the improvement of deposition reproducibility in the selective electrodeposition process using laser masking and DC voltage. Selective electrodeposition using laser masking and DC voltage can achieve a deposited layer with micro patterns. However, selective electrodeposition using laser masking and DC voltage have a critical problem: the lack of reproducibility in selective deposition. The reproducibility of selective electrodeposition can be improved by a new process that consists of laser masking, two-step electro-deposition, laser scribing, and ultrasonic cleaning. The experiments in this study show that the reproducibility of selective deposition can be successfully improved by the combination of two-step electrodeposition and laser scribing.
Development of a Small Floating Outboard Type Water-Jet Propulsion System
Jeong, Jae Hoon ; Yi, Chung Seob ; Lee, Chi Woo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 1, 2016, Pages 42~47
DOI : 10.7735/ksmte.2016.25.1.42
This paper presents the development of a floating outboard type of compact water jet propulsion system. The planning case of the water jet system is developed by performing precision processing after manufacturing FRP (Fiber Reinforced Plastics) from plug mold casting. This system is composed of an intake, impeller, diffuser, reverse bucket, and main shaft. In addition, a rebuilt engine was applied through marine engineering. The water jet propulsion system performance was verified to discharge a maximum
of flow rate and 37 m/s of flow velocity in a test pool on land. A field test was performed by installing the water jet propulsion device on board a ship that was tested off the coast of Korea. The weight of the hull, engine, and other equipment was approximately 1.2 tons, and the sailing speed was a maximum 22 knots at 3,600 rpm.
Evaluation of the Integrity of TIG Welding Using Non-Contact SH-EMAT
Park, Tae Sung ; Park, Yeong Hwan ; Park, Ik Keun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 1, 2016, Pages 48~53
DOI : 10.7735/ksmte.2016.25.1.48
An EMAT can be used to reliably detect defects as it serves as a non-contact transducer with the ability to transmit ultrasonic waves into specimens without couplant. Moreover, an EMAT can easily generate desired waves by altering the design of the coil and magnet. This study proposes an SH-EMAT to evaluate the integrity of the TIG welding part. A stainless steel was welded using the TIG welding method. The welding current was varied to create artificial defects. Both the PA-UT and the RT were applied to verify the defect size. The experimental results generated by using the EMAT were compared with those methods. The amplitude was observed to decrease with an increase in the defect size. These results confirmed that the presence of defects can be reliably detected by attenuation of signal amplitude. The results demonstrated that the proposed method is suitable for evaluating the integrity of TIG welding.
Numerical Study on the Discharge of Humidity in the Drum of a Washing Machine
Jung, Chung-Hyo ; Sohn, Deok-Young ; Na, Seon-Uk ; Choi, Yun-Ho ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 1, 2016, Pages 54~61
DOI : 10.7735/ksmte.2016.25.1.54
Washing machine manufacturers typically advise consumers to maintain the relative humidity in the drum less than 80% for three days after the termination of a washing cycle in order to prevent bacteria proliferation. A vent installed in the back of a washing machine is used to release moisture to satisfy this condition. Up to now, the design and installation of the vent have been based on experiments without understanding its roles and physical phenomena. In this study, various CFD results are presented in order to explain the physical mechanism of moisture release in a washing machine. Two methods of moisture release (diffusion and convection) were studied; diffusion was found to be the dominant process in removing moisture. Experiments were also performed to validate this behavior. In addition, this study will aid in the efficient design of vents to keep the relative humidity low inside the drum.
Fabrication of a Silicon Nanostructure Array Embedded in a Polymer Film by using a Transfer Method
Shin, Hocheol ; Lee, Dong-Ki ; Cho, Younghak ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 1, 2016, Pages 62~67
DOI : 10.7735/ksmte.2016.25.1.62
This paper presents a silicon nanostructure array embedded in a polymer film. The silicon nanostructure array was fabricated by using basic microelectromechanical systems (MEMS) processes such as photolithography, reactive ion etching, and anisotropic KOH wet etching. The fabricated silicon nanostructure array was transferred into polymer substrates such as polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), and polycarbonate (PC) through the hot-embossing process. In order to determine the transfer conditions under which the silicon nanostructures do not fracture, hot-embossing experiments were performed at various temperatures, pressures, and pressing times. Transfer was successfully achieved with a pressure of 1 MPa and a temperature higher than the transition temperature for the three types of polymer substrates. The transferred silicon nanostructure array was electrically evaluated through measurements with a semiconductor parameter analyzer (SPA).
Dissimilar Metal Welding Characteristics for Medium Carbon Steel and Stainless Steel Using a Nd:YAG Laser
You, Young-Tae ; Lee, Hyun-Jung ; Kim, Jin-Woo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 1, 2016, Pages 68~74
DOI : 10.7735/ksmte.2016.25.1.68
The Nd:YAG laser welding process is one of the most advanced manufacturing technologies owing to its high speed and penetration, and has increased the automation and flexibility of an entire industry. Laser welding of dissimilar metals has been widely used to improve the wear resistance and corrosion resistance of industrial parts. The objective of this research is to investigate the influence of process parameters on the welding of SM45C and STS304 with CW Nd:YAG lasers. Bead-on-plate welding tests were carried out for several combinations of the experimental conditions. In order to quantitatively examine the characteristics of the dissimilar welding, the welding quality of the cut section, strain-stress behavior, and hardness of the welded part were investigated.
Development of Low-Vibration Controller for Ultra-Precision Dual Stage
Kang, Seok Il ; Kim, Jung-Han ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 1, 2016, Pages 75~82
DOI : 10.7735/ksmte.2016.25.1.75
In this study, a cross-damped low vibration controller was developed to reduce vibration in ultra-precision dual stage driven by master/slave principle. In master-slave structure, the master stage leads the driving motion and the slave stage follows it so as to maintain a constant gap between two stages. In this structure, a small perturbation of master stage makes big oscillations in slave servoing stage, so a low damped master stage composed of voice coil motor makes a long vibration in settling area after driving motion profile. In this research, an effective feedback damping algorithm for increase the damping characteristics of the dual stage was developed. The designed velocity damping algorithm improves the system stability and reduces the settling time of the whole system. Simulation and experimental results show that the developed algorithm reduces settling time and improves the regulating performance.
Modeling of Depth/Width of Cut for Abrasive Water Jet Milling of Titanium
Park, Seung Sub ; Kim, Hwa Young ; Ahn, Jung Hwan ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 1, 2016, Pages 83~88
DOI : 10.7735/ksmte.2016.25.1.83
Because of the increasing tool cost for cutting hard-to-cut materials, abrasive water jet (AWJ) milling recently has been regarded as a potential alternative machining method. However, it is difficult to control the depth and width of cut in AWJ milling because they vary depending on many AWJ cutting parameters. On 27 conditions within a limited range of pressure, feed rate, and abrasive flow rate, AWJ cutting was conducted on titanium, and depth profiles were measured with a laser sensor. From the depth profile data, depth and width of cut were acquired at each condition. The relationships between depth and parameters and between width and parameters were derived through regression analysis. The former can provide proper cutting conditions and the latter the proper pick feed necessary to generate a milled surface. It is verified that pressure mostly affects depth, whereas abrasive flow rate mostly affects width.
Pulsation According to Pre-Compression Sections and Valve Plate Design for a Swash Plate Type Piston Pump
Sa, Jin-Woong ; Chung, Won-Jee ; Bae, Jun-Hyeong ; Lee, Jeong-Min ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 1, 2016, Pages 89~95
DOI : 10.7735/ksmte.2016.25.1.89
This study investigated the design factors of the opening area in order to consider the kinematic stability of a valve plate, conducting an analysis of the reduction effects of pressure pulsation and flow ripple depending on the design factors, using the
(Germany) hydraulic analysis program. Further, we performed a structure analysis to confirm the kinematic stability of the valve plate in a swash plate type piston pump, and analyzed the effects of pulsation on a 1-step V-type notch, 2-step V-type notch, and 2-step U-type notch to determine the effects of pulsation reduction. Finally, we show the effectiveness of our proposed design of the pre-compression sections on a valve plate in terms of low pulsation by using the hydraulic analysis program,