Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society of Manufacturing Process Engineers
Journal Basic Information
Journal DOI :
The Korean Society of Manufacturing Process Engineers
Editor in Chief :
Volume & Issues
Volume 13, Issue 6 - Dec 2014
Volume 13, Issue 5 - Oct 2014
Volume 13, Issue 4 - Aug 2014
Volume 13, Issue 3 - Jun 2014
Volume 13, Issue 2 - Apr 2014
Volume 13, Issue 1 - Feb 2014
Selecting the target year
Measurement of the Compressive Force on the Knee Joint Model fabricated by 3D Printing
Jeong, Hoon Jin ; Jee, Min-Hee ; Kim, So-Youn ; Lee, Seung-Jae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 1~7
DOI : 10.14775/ksmpe.2014.13.2.001
Recent experimental observations support the hypothesis that mechanical stimuli play a role in regulating the specialized molecular expression of articular cartilage in vitro and in vivo. Other studies have demonstrated that the continuous passive motion(CPM)bioreactor for whole joints can provide a platform for possible future in vitro studies and applications, including possible interactions of bio-mechanical and biochemical signals. In this study, we have developed acustom-made bioreactor capable of bending and stretching with circular type motion, and a biomimetic knee joint model, using a 3D printer. This system could be used to investigate the effects of rehabilitative joint motion of dynamic culture.
Development of a Photopolymer-based Flexible Tactile Sensor using Layered Fabrication and Direct Writing
Woo, Sang Gu ; Lee, In Hwan ; Kim, Ho-Chan ; Lee, Kyung Chang ; Cho, Hae-Yong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 8~14
DOI : 10.14775/ksmpe.2014.13.2.008
Many kinds of robots and machines have been developed to replace human laborin industrial and medical fields, as well as domestic life. In these applications, the device sneed to obtain environmental data using diverse sensors. Among such sensors, the tactile sensor is important because of its ability to get information regarding surface texture and force through the use of mechanical contact. In this research, a simple tactile sensor was developed using the direct writing of pressure sensitive material and layered fabrication of photocurable material. The body of the sensor was fabricated using layered fabrication, and pressure sensitive materials were dispensed between the layers using direct writing. We examined the line fabrication characteristics of the pressure sensitive material according to nozzle dispensing conditions. A simple
array flexible tactile sensor was successfully fabricated using the proposed process.
Development of Stereolithography Apparatus by using UV-LED
Yun, Hae-Yong ; Ko, Tae-Jo ; Kim, Ho-Chan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 15~20
DOI : 10.14775/ksmpe.2014.13.2.015
The stereolithography(SL) process is a type of fabrication technology which relies on photopolymerization. It has a relatively simple fabrication process and a resolution of several tens of
. Recently, SL technology has been applied to various areas, such as bioengineering and MEMS devices, due to the development of advanced materials. This technologycan be divided intothe scanning(SSL) and projection (PSL) types. In this paper, in stereolithography, parts are fabricated by curing photopolymeric resins with light. The application of stereolithography can now include fabricated parts. This process, called stereolithography, can fabricate parts by taking into account theirdegrees of geometry complexity. In particular, UV-LED stereolithography can perform quite rapid fabrication in which specific cross-sections are cured upon exposure to light.
Fabrication of a Polymeric Film with Nanofiber-based Porous Window and Its Application to Co-culture
Jeong, Young Hun ; Lee, Jongwan ; Jin, Songwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 21~27
DOI : 10.14775/ksmpe.2014.13.2.021
Recently, various biochip environments have been presented. In this study, a novel transparent film with porous membrane windows, which is an essential component in a co-cultured biochip environment, is fabricated using spin-coating, 3D printing, and electrospinning processes. In detail, a transparent polystyrene film was fabricated by means of the spin-coating process followed bywindow cutting, after which apolycaprolactone-chloroform solution was deposited along the window edge to introduce an adhesion layer between the PS film and the PCL nanofibers. Nanofibers were electrospun into the window region using a direct-write electrospinning method. Consequently, it was demonstrated that the fabricated window film could be used in a co-culture biochip environment.
Real-time measurement of the width of piston ring groove on the grinding process
Kim, Byoung-Chang ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 28~34
DOI : 10.14775/ksmpe.2014.13.2.028
A non-contact type measurement system is specially devised to measure the width of a piston ring groove in the grinding process. This system comprises a line camera with an imaging lens, collimated white light source, and a one axis translation stage. When the measurement system movesalong the diagonal direction of the cylinder, the line camera captures an image. By analyzing such images, the width of the piston ring groove can be determined. The experimental results prove that the proposed system is useful, especially as a monitoring system in grinding piston ring grooves on cylinders with accuracy of several micrometers in an area of dozens of millimeters.
Development and Evaluation of Dry Lubricant Recycle Technologies for Wire Drawing Process
Kim, Sun-Ho ; Jang, Gyu-Chul ; Lee, Chi-Wook ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 35~40
DOI : 10.14775/ksmpe.2014.13.2.035
Wire drawing is aplastic deformation process that produces a wire with a desired diameter by pulling the end of the wire through a die. During the cold wire drawing process, the temperature between the wire and the die bearing is increased. This temperature increase causesenergy consumption increase, bad wire quality, and decreased die life. To reduce friction and avoid high temperature between the wire and the die in the cold wire drawing process, a dry lubricant with soap particles is used. It is not possible to reused the lubricant onceiron oxide is attached to the soap particlesat high pressure die. In this study, recycling technologies for wasted soap particles with processes of crushing, separation, and screening are developed. From the evaluation, the recycling efficiency was found to be 86.97%.
Characteristics of Surface Lamination according to Nozzle Position in Liquid Direct Writing SFF
Jung, Hung Jun ; Lee, In Hwan ; Kim, Ho-Chan ; Cho, Hae Yong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 41~48
DOI : 10.14775/ksmpe.2014.13.2.041
Direct writing(DW) is a method of patterning materials to a substrate directly, without a mask. It can use a variety of materials and be applied to various fields. Among DW systems, the flow-based type, using a syringe pump and nozzle, is simpler than other types. Furthermore, the range of materials is exceptionally wide. In additive processes, a three dimensional structure is made of stacking layer. Each layer is made of several lines. In this regard, good surface roughness of fabricated layers is essential to three dimensional fabrication. The surface roughness of any fabricated layer tends to change with the dispensing pattern. When multiple layers fabricated by a nozzle dispensing system are stacked, control of the nozzle position from the substrate is important in order to avoid interference between the nozzle and the fabricated layer. In this study, a fluid direct writing system for three dimensional structure fabrication was developed. Experimentsto control the position of the nozzle from substrate were conducted in order to examine the characteristics of the material used in this system.
A Study on the Drilling Characteristics for Implant Procedure Drill
Lee, Sang-Min ; Chae, Seung-Su ; Lee, Jae-Kun ; Choi, Hwan ; Lee, Jong-Chan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 49~54
DOI : 10.14775/ksmpe.2014.13.2.049
Skull Melted 3.2YSZ has good physical properties and does not undergo low temperature degradation. Due to these excellent physical and mechanical properties, Skull Melted 3.2YSZ has been studied for use in dental implants. In this study, a ø2.2mm Initial Twist Drill was made using Skull Melted 3.2YSZ; the drilling characteristics were compared with those of the traditional SUS420J drill. The experimental results indicate that the Skull Melted 3.2YSZ drill requires similar thrust forces and has a slightly higher temperature.
Optimization of Sheet Metal Forming Process Based on Two-Attribute Robust Design Methodology
Kim, Kyung-Mo ; Yin, Jeong-Je ; Park, Jong-Cheon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 55~63
DOI : 10.14775/ksmpe.2014.13.2.055
Fractures and wrinkles are two major defects frequently found in the sheet metal forming process. The process has several noise factors that cannot be ignored when determining the optimal process conditions. Therefore, without any countermeasures against noise, attempts to reduce defects through optimal design methods have often led to failure. In this study, a new and robust design methodology that can reduce the possibility of formation of fractures and wrinkles is presented using decision-making theory. A two-attribute value function is presented to form the design metric for the sheet metal forming process. A modified complex method is adopted to isolate the optimal robust design variables. One of the major limitations of the traditional robust design methodology, which is based on an orthogonal array experiment, is that the values of the optimal design variables have to coincide with one of the experimental levels. As this restriction is eliminated in the complex method, a better solution can be expected. The procedure of the proposed method is illustrated through a robust design of the sheet metal forming process of a side member of an automobile body.
Analysis on Specific Cutting Resistance Variation by Tool Angles Based on a Concept of Representative Stres
Jeon, Eun-Chae ; Choi, Hwan-Jin ; Lee, Kyu-Min ; Lee, Yun-Hee ; Je, Tae-Jin ; Kim, Jeong-Hwan ; Choi, Doo-Sun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 64~72
DOI : 10.14775/ksmpe.2014.13.2.064
In the past, prism patterns have been linear triangular shapeswith a
angle; however, new micro prism patterns having acute angles or obtuse angles have recently been the subject of demandin the display, lighting and photovoltaic industries. Micro-cutting experiments for micro-prism patterns having
angles on an electroplated Ni mold were performed and it was found in this study that the specific cutting resistance increased with a decrease in the tool angles (prism pattern angles). The cause of this variation had been thought to be the increase of the ploughing force due to tip rounding and the friction force due to the edge effect. However, the depth of the cut was large enough that it was possible to neglect these effects. Therefore, this study introduced the concept of representative stress of indentation. The measured stress was varied according to the indentation depth eventhoughthetestedspecimenswereidentical ; the varied stress was termed the representative stress. According to indentation theory, the strain that the Ni mold experienced increased with a decrease in the tool angle. Based on the stress-strain relationship, higher strain means higher stress and higher specific cutting resistance. Therefore, the specific cutting resistance was higher at smaller tool angles that had higher strain and stress.
Shock Analysis of Gimbal Structure System Including Rubber Vibration Isolator in a Observation Reconnaissance Aircraft
Lee, Sang Eun ; Lee, Tae Won ; Kang, Yong Goo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 73~80
DOI : 10.14775/ksmpe.2014.13.2.073
A camera module that gathers visual information via aerial observation reconnaissance is equipped inside a gimbal structure. This gimbal structure system must reduce dynamic responses in order to obtain clear images under all circumstances. Among many design specifications for this system, there is MIL-STD-810G as a shock standard. This specification indicates a limitation of the acceleration of the camera module under a base shock excitation on the gimbal structure. The satisfaction of this condition can usually be proved by experiment, because it includes bearings and dynamic isolators made of rubber. Numerical analysis must be proposed for design improvement of the gimbal structure. To achieve this goal, transient response analysis for the base shock excitation was performed using the finite element method. Experimental results were compared with numerical solutions and it is shown that the present method is useful.
A Study on Effect of Process Parameters and Development of Prediction Model for Prepolymer Mass Production
Ha, Kyong-Ho ; Kang, Dae-Min ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 81~88
DOI : 10.14775/ksmpe.2014.13.2.081
Synthetic products such as casting tape and splints are rapidly replacing conventional plaster casts to treat orthopedic patients. Most synthetic products are produced through a polymerization process with related chemical agents. In this study, the effect of the process parameters on the residual NCO content within a prepolymer for casting tape and the hardening temperature for casting tape were experimentally evaluated. In order to verify the effects of the process parameters, an experimental method was adopted. From an S/N ratio analysis, optimal parameter combinations were determined to produce a pre-polymer with a suitable residual NCO content and alower hardening temperature. Prediction models for the NCO content and the hardening temperature were developed and confirmed.
Variable Polarity Arc Welding of Aluminum Thin Plate
Cho, Jungho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 89~93
DOI : 10.14775/ksmpe.2014.13.2.089
Variable polarity (VP) arc welding is known as an effective solution for aluminum thanks to the cleaning effect, which means oxide removal, during the DCEP (direct current electrode positive) period. In this research, VP GTAW (gas tungsten arc welding) is adopted for lap joint fillet welding of 3mm thickness 5052 aluminum alloy. Various welding currents and DCEP duty cycles are applied as welding conditions with a fixed welding speed to investigate the influence of DCEP characteristics on weld bead formation. Results show a tendency of higher heat input for higher DCEP duty cycle, which result does not follow conventional arc theory because it is known that DCEN (DC electrode negative) polarity is more efficient for heat input than is DCEP. This phenomenonhas recently been reported by several VP-GTA researchers and is still controversial because the mechanism of oxide removal is not yet clear except for the previous, well-known idea of "ion bombardment", which cannot explain the situation. Finally, proper usage conditions for VP-GTAW are suggested; then, further, related theoretical topics in the field of cathode physics are brieflyintroduced.
A Study on the Grinding Characteristics of AlNs Produced by Different Sintering Techniques
Cho, Jun-Hyun ; Lee, Sang-Min ; Moon, Dong-Ju ; Lee, Jong-Chan ; Jung, Jae-Keuk ; Huh, Chan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 94~99
DOI : 10.14775/ksmpe.2014.13.2.094
In this study, using AlN materials produced by two different sintering techniques, grinding experiments were performed under various grinding conditions, including different table speeds and cut depths. In order to measure the grinding force, a tool dynamometer was used. Surface roughness measurements and a digital microscope were also was used. The grinding forces were higher at a higher table speed and a higher cut depth. The experimental results show that the grinding characteristics of the two workpieces are similar.
Study on the Total Design of a Conical Involute Gear
Kim, Jun-Seong ; Lee, Do-Young ; Kang, Jai-Hwa ; Xu, Zhe-Zhu ; Lyu, Sung-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 100~107
DOI : 10.14775/ksmpe.2014.13.2.100
Currently, there are many power transmission devices, including gears, friction wheels, chains, and belts. Because the power transmission of gears is most certainin these devices, gears are widely used in different power transmission fields and environments. In accordance with the gear shape, gears can be classified as cylindrical gears and conical gears. A cylindrical gear, which provides a means of power transmission under parallel axis and skewed axis conditions, contains a spur gear, a helical gear and a worm gear. A conical gear, which can be used on a skewed axis as well as parallel and crossed axes, includes a bevel gear(e.g., straight bevel, spiral bevel, hypoid gear) and a conical involute gear(or a bevel oid gear). In this paper, a conical involute gear which utilizes the fabrication method of other involute gears such as spur and helical gears using a CNC hobbing machine is discussed.
An analysis of cutting force according to specific force coefficients
Kim, Jong-Do ; Yoon, Moon-Chul ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 108~116
DOI : 10.14775/ksmpe.2014.13.2.108
Considering the run-out effect and cutting force coefficients, the cutting force profile of half immersion end-milling was analyzed in detail. The effects of three specific cutting-force coefficients and three edge-force coefficients are verified. Through a detailed investigation, it is proved that the radial cutting force coefficients and are the major factors which increase the cutting forces Fx and Fy in end-milling. However, the axial cutting force coefficients have no influence on the force Fx and Fy changes in end-milling. Also, the analyzed end-milling force model shows good consistency with the actual measured force with regard to Fx and Fy. Thus, this model can be used for the prediction of the force history in end-milling with run-out, and it incurs a different force history with different start and exit immersion angles as well as holding effects.
Unified-type Design and Structural Analysis for Mecanum Wheel Performance Improvement
Jeong, Jeaung ; Kwon, Soon-Jae ; Chu, Baeksuk ; Park, Junyoung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 117~123
DOI : 10.14775/ksmpe.2014.13.2.117
In order to provide a mobile robot with omnidirectionality, various types of omnidirectional wheels have been developed. This paper deals with an improved design and structural analysis of a Mecanum wheel, which is the type of omnidirectional wheels most commonly used in industrial fields. A geometric formulation for manufacturingthe Mecanum wheel is presented and two types of Mecanum wheels are designed and fabricated in this research. While conventional assembled-type Mecanum wheels have a complicated structure and the high possibility of mutual interference between sub-components, a unified type of Mecanum wheel reduces the number of sub-components and increases the degree of structural rigidity. The stress and strain properties of the two designs are compared to confirm the quantitative improvement of the new design by a commercial structural analysis tool. The analysis results show that the unified type of Mecanum wheel has properties superior to the assembled type of Mecanum wheel in terms of its ability to reduce interference.
Computational Thermo-Fluid Analysis for the Effects of Helium Injection Methods on Glass Fiber Cooling Process in an Optical Fiber Manufacturing System
Park, Shin ; Kim, Kyoungjin ; Kim, Dongjoo ; Park, Junyoung ; Kwak, Ho Sang ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 124~130
DOI : 10.14775/ksmpe.2014.13.2.124
In a mass manufacturing system of optical fibers, the sufficient cooling of glass fibers freshly drawn from a draw furnace is essential, asinadequately cooled glass fibers can lead to poor resin coating on the fiber surface and possibly fiber breakage during the process. In order to improve fiber cooling at a high drawing speed, it is common to use a helium injection into a glass fiber cooling unit in spite of the high cost of the helium supply. The present numerical analysis carried out three-dimensional thermo-fluid computations of the cooling gas flow and heat transfer on moving glass fiber to determine the cooling performance of glass fiber cooling depending on the method of helium injection. The results showed that afront injection of helium is most effective compared to a uniform or rear injection for reducing air entrainment into the unit and thus cooling the glass fibers at a high fiber drawing speed. However, above a certain amount of injected helium, there was no more increase of the cooling effect regardless of the helium injection method.
Performance Experiment of H-120 Class Fire Damper for Offshore
Jang, Sung Cheol ; Hur, Nam-Soo ; Kim, In-Whan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 2, 2014, Pages 131~136
DOI : 10.14775/ksmpe.2014.13.2.131
In this paper, a fire resistance test was carried out in accordance with the change of the insulation conditions on the exposed side and unexposed side of a coaming to obtain the optimal insulation conditions for class H-120 insulation in connection with specimen1 of the preceding paper for an evaluation of the fireproof performance of fire dampers according to hydrocarbon fire conditions. In the test results, specimen2(88 mm,
) met the class H-120 insulation conditions, but specimen3(76mm,
) exceeded the thermal insulation acceptance criteria at 110 minutes. Therefore, specimen2(88 mm) represents the optimal insulation conditions as a possible lightweight materialas compared to specimen1. From a comparison of the test results, we concluded that the temperature increase of the coaming insulation surface was influenced by conductive heat from the bulkhead and that the coaming surface was influenced by radiant heat from the blade and coaming.