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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 14, Issue 6 - Dec 2015
Volume 14, Issue 5 - Oct 2015
Volume 14, Issue 4 - Aug 2015
Volume 14, Issue 3 - Jun 2015
Volume 14, Issue 2 - Apr 2015
Volume 14, Issue 1 - Feb 2015
Selecting the target year
Tool Breakage Detection Using Feed Motor Current
Jeong, Young Hun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 1~6
DOI : 10.14775/ksmpe.2015.14.6.001
Tool condition monitoring plays one of the most important roles in the improvement of both machining quality and productivity. In this regard, various process signals and monitoring methods have been developed. However, most of the existing studies used cutting force or acoustic emission signals, which posed risks of interference with the machining system in dynamics, fixturing, and machining configuration. In this study, a feed motor current signal is used as a process signal representing process and tool states in tool breakage monitoring based on an adaptive autoregressive model and unsupervised neural network. From the experimental results using various cases of tool breakage, it is shown that the developed system can successfully detect tool breakage before two revolutions of the spindle after tool breakage.
Study of Injection Molding Process of Shift Lever Using Injection Molding Analysis
Park, Chul-Woo ; Lee, Boo-Youn ; Lee, Sang-Min ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 7~13
DOI : 10.14775/ksmpe.2015.14.6.007
The production processes were reviewed through the injection analysis of the shift lever as a core component of an auto lever installed in the automatic transmission of cars. The injection analysis was carried out for the shift lever and rod among the components in a shift lever module. The shift lever and rod are designed for injection molding with the insertion of a tube, a pin cable plate, and a steel rod for securing the strength of the product. The charging time, failure of injection molding, weld line, air trap, and deformation were reviewed according to this insert. Analyses on various gate positions were carried out for reviewing the cultivation and deformation of fiber around major components, such as the generation section of manipulation feeling and assembly section, so that optimal gate conditions might be reviewed and reflected in the mold design. Finally, we plan to compare the analysis results with the production of trial products.
A Study on the Embodiment of a Transfer Case with High-Speed Reduction of the Planetary Gear Type Applied to Big Industrial Vehicles
Lee, Won-Kyu ; Park, Se-Myoung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 14~20
DOI : 10.14775/ksmpe.2015.14.6.014
A high-speed reduction transfer case is usually employed by an excavator, wheel loader, or bulldozer. When powerful torque is required in the case of climbing steep roads or towing heavy equipment, the high-speed reduction mode of the gearbox is used. Generally, a transfer case using a spur gear type with a speed reduction system has a speed reduction ratio of 1 to 1 or 2 to 1. However, the structure of a transfer case achieved at a high speed of 1 to 1 and a low speed of 4.5 or under 5.5 to 1 with the speed reduction by use of a planetary gear type with a speed reduction system was proposed in this study. By employing a planetary gear type with a speed reduction system, the compact structure of the transfer case was achieved, and the impact or the partial defect of gear teeth was eliminated.
Development on Cleaning System of Condenser for Nuclear Power Plant by Using Sponge Ball
Yi, Chung-Seob ; Lee, Chi-Woo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 21~26
DOI : 10.14775/ksmpe.2015.14.6.021
This study presents a development of the cleaning system in a nuclear power plant condenser. The tube cleaning system is very important equipment in a power plant condenser. Specially, removal of the fouling is a key process in the condenser tube. The objective of this study is development of a ball collector system for cleaning a condenser by using a sponge ball. This study uses CFD in order to optimize design of the ball strainer screen. Through the CFD, the implication of the ball strainer screen for static pressure distribution is examined. Results of research, this study have developed a 1/5 scale model for application to the power plant and developed a performance test equipment.
Usage of Dynamic Vibration Absorbers for a Beam Subjected to Moving Forces and for a System Mounted on a Moving Base
Lee, Gun-Myung ; Byun, Jai-Hyun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 27~34
DOI : 10.14775/ksmpe.2015.14.6.027
Dynamic vibration absorbers are widely used in machinery, buildings, and structures, including bridges. Two cases of their usage are considered in this paper. One is a simply supported beam subjected to either a moving force or a sequence of moving forces, which simulates a train-bridge interaction problem. The other is a case where a primary system is mounted on a base that is not grounded and is excited by an external force. The conditions that the dynamic vibration absorbers must meet in these cases are found and compared to those for usual cases where bases of primary systems are grounded.
A Structural Analysis by Finite Element Method under the Dropping Condition of Standardized IP-2 Metal Container for Decommissioning Radwaste Transportation
Choi, Kyu-Sup ; Park, Jea-Ho ; Park, Ji-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 35~40
DOI : 10.14775/ksmpe.2015.14.6.035
An IP-2 type container is used for the transport of low-level radioactive materials. An IP-2 type metal container was modeled and analyzed for the dropping conditions in normal transport conditions required by NSSC Notice 2014-50, "Regulations on the packaging and transport of radioactive materials." Structural analyses were performed by finite element method, and the acceptability was reviewed by comparing the results with technical standards and maximum allowable stresses of each material. Structural members of the container were modeled as 3D solid elements, and the possible dropping directions were considered in these analyses. Results show that maximum stresses, maximum deformed gaps in the cover, and maximum estimated thickness reduction in structural members were well below the allowable limits; thus, the structural integrity of the container was confirmed.
Machining Characteristics according to Electrochemical Polishing (ECP) Conditions of Stainless Steel Mesh
Kim, Uk Su ; Park, Jeong Woo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 41~48
DOI : 10.14775/ksmpe.2015.14.6.041
Stainless steel mesh has been used as a filter in various fields, including domestic, medical, etc. However, the surface before machining may have an adverse effect the product quality and performance because it is not smooth. Especially, adsorbed impurities in the surface result in difficulty in cleaning. Therefore, in this paper, we propose an improved surface quality through electrochemical polishing (ECP). Two electrodes, composed of STS304 (anode) and copper (cathode) underwent machining with two conditions according to polishing time and current density. As the polishing time and current density increase, the surface of curvature decreases, and roughness and material removal rate (MRR) improves. The machined surface roughness and image were obtained through the atomic force microscope (AFM) and stereoscopic microscope. The study also analyzed hydrophilic effect through contact angles. This obtains corrosion resistance, smoothness, hydrophilic property, etc.
Development of a Design Support Program for Pivot Points of Working Devices in Construction Equipment using Planar Multi-body Dynamic Analysis
Park, Hyun-Gyu ; Jang, Jin-Seok ; Yoo, Wan-Suk ; Kim, Min-Seok ; Lee, Hee-Jong ; Lee, Jae-Wook ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 49~56
DOI : 10.14775/ksmpe.2015.14.6.049
For designing working devices of construction equipment, it is necessary to consider not only sufficient working ability but also available working range. Therefore, it is important to select the appropriate pivot positions of links. This paper presents a study on selection of pivot points of links used in construction equipment. To analyze the effect of each pivot point, a design program for pivot selection is developed. A conventional pivot design method requires a complicated process because it needs to create a certain working position manually to evaluate its performance. However, the developed program includes an automatic link assembly algorithm; thus, the working device can easily be analyzed by using pivot information of links. The developed program also included a kinematic/static analysis module and characteristic analysis algorithms. Therefore, it is possible to easily analyze a working device model created through the automatic assembly algorithm, whereby users can easily analyze the effect of each link pivot point for the actual product design.
Fitting Pipe Flange Process Research Using Orbital Forming
Kim, TaeGual ; Park, JoonHong ; Park, YoungChul ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 57~62
DOI : 10.14775/ksmpe.2015.14.6.057
A large variety of pipe flanges are required in the marine and construction industry. Pipe flanges are usually welded or screwed to the pipe end and are connected with bolts. This approach is very simple and has been widely used for a long time; however, it results in high development costs and low productivity, and the products made through this approach usually have safety problems in the welding area. In this research, a new approach for forming pipe flanges based on cold forging and the floating die concept is presented. This innovative approach increases the effectiveness of the material usage and saves time and costs compared with the conventional welding method. To ensure the dimensional accuracy of the final product, finite element analysis (FEA) was carried out to simulate the process of cold forging, and orthogonal experiment methods were used to investigate the influence of four manufacturing factors (stroke of distance, pin die angle, forming of pipe diameter, and speed of the die) and predict the best combination of them. The manufacturing factors were obtained through numerical and experimental studies, which show that the approach is very useful and effective for the forming of pipe flanges and could be widely used in the future.
Experimental Study on Production Characteristics of Straight Bevel Gear using a Polyjet Method 3D Printer
Kim, Hae-Ji ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 63~68
DOI : 10.14775/ksmpe.2015.14.6.063
Recently, 3D printer technologies have been used in many research efforts for high precision manufacturing. In particular, the rapid prototyping technology has been developing rapidly, because it can be manufactured in a short time with a 3D designed shape. This paper relates to the production characteristics of the straight bevel gear designed using a 3D print using the PolyJet method. The characteristics of a 3D printed straight bevel gear were compared with a machined straight bevel gear. The accuracy of the produced straight bevel gear was evaluated by backlash, meshing pattern, face angle, root angle, and surface roughness.
A Study on the Analysis of Thermal Durability due to the Configuration of Mortar
Han, Moonsik ; Cho, Jaeung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 69~76
DOI : 10.14775/ksmpe.2015.14.6.069
This study investigates the thermal efficiency and the efficiency of heat transfer through thermal analysis when the same heat is applied to a mortar frame by firing with various configurations of mortar. As the inside diameter of the mortar increases, the additional material must be reinforced. In comparison with the extent of getting cold due to models, a mortar with the strut under the gun barrel becomes cooler than one with no strut. The thermal deformation at firing becomes different. According to the configuration of mortar and its inside diameter, the extent of getting cold becomes different. This study result can be effectively applied for improving the efficiency of the heat transfer of mortar.
A Study on Automated Multi-Channel Combination System for the Closest Target Weight
Ahn, Yong-Woo ; Ban, Kap-Soo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 77~83
DOI : 10.14775/ksmpe.2015.14.6.077
This paper is a study of the functions required for the system to quantify the closest target weight by combining several random weights such as chips, snacks, fruits, and vegetables. The multi-head weigher is designed for high-performance applications requiring increased production rates and tight accuracy tolerances. This combination system has 12 heads considered in the form of a rectangular array of
. Channel combination can usually occur between 1 and n, and the frequency was the highest with two or three combinations. Experimental result of a combination system for a total target weight was measured at the range from 100g to 500g by increments of 50g, and the average success rate was about 70%. The average elapsed time was about 1.7 seconds, which means it can be used for the packaging of agricultural products with a variety of items.
Durability Design of the Thickness of Bicycle Frames
Han, Sang Geun ; Chun, Se Young ; Kang, Seong Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 84~89
DOI : 10.14775/ksmpe.2015.14.6.084
The thickness of a stable and economical frame has been designed in order to reduce costs. Therefore, this study applied structural analysis and vibration analysis based on a comparison of the thicknesses of frames. Four types of frames (1mm, 2mm, 3mm, and 5mm) were modeled on a bicycle frame that has a length of 842mm, a width of 100mm, and a height of 400.5mm, and all of these frames generated the stress and maximum deformation amount in the state and around the saddle. The maximum stress shown was 25.732 MPa in 1mm, 11.79 MPa in 2mm, and 8.2015 MPa in 3mm, and the maximum deformation amount shown was 0.063611mm in 1mm, 0.031978mm in 2mm, and 0.022319mm in 3mm. The natural frequency of the frame thicknesses 1mm, 2mm, and 3mm was estimated as within 270 Hz. The critical frequency of conditions of 3mm was the biggest at 118.1Hz compared with the 3-mm model; thus, 3mm was shown to have the most satisfactory resistance.
Development of a Practical Method to Optimize Two-Quality Characteristics in Injection Molded Parts
Park, Jong-Cheon ; Cha, Jae-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 90~97
DOI : 10.14775/ksmpe.2015.14.6.090
Optimization of multi-quality characteristics in injection molded parts is very important, but it is sometimes difficult for part/mold designers. The objective of this study is to develop a practical design methodology for optimizing two-quality characteristics of injection molded parts. To attain this end, we developed a new design-range reduction algorithm based on Taguchi`s orthogonal arrays for two characteristics. Then, the algorithm was integrated with commercial injection-molding simulation tools. A feature of the proposed methodology is that it allows field-designers unfamiliar with general optimization methods to be able to apply the methodology to their design problems with ease. Finally, we have applied the proposed design methodology to optimization of weldlines and deflections in an actual bezel model. The results show the usefulness of this methodology.
Study on Optimal Design and Analysis of Worm Gear Reducer for High Place Operation Car
Kim, Tae Hyun ; Jang, Jeong Hwan ; Lee, Dong Gyu ; Kim, Lae Sung ; Lyu, Sung-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 98~103
DOI : 10.14775/ksmpe.2015.14.6.098
Swing reducers are widely used in special vehicles that have swing motions. Generally, compact swing reducers were constituted by a worm gear pair. Worm gears are one of the most important technical devices for transmitting torque between spatially crossed axes. Due to their high transmission ratio and compact structure, they are widely used in power transmission applications where high reduction is required. This paper presented approaches to improve the transmission efficiency and assembling performance of 3.5 ton class worm gear swing reducers. Worm wheel and the case of swing reducers were optimized and certified by a finite element method. Finally, an actual swing reducer was processed and assembled to test the performance.
Development of Internal Laser Scribing System for Cutting of Sapphire Wafer in LED Chip Fabrication Processes
Kim, Jong-Su ; Ryu, Byung-So ; Kim, Ki-Beom ; Song, Ki-Hyeok ; Kim, Byung-Chan ; Cho, Myeong-Woo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 104~110
DOI : 10.14775/ksmpe.2015.14.6.104
LED has added value as a lighting source in the illuminating industry because of its high efficiency and low power consumption. In LED production processes, the chip cutting process, which mainly uses a scribing process with a laser has an effect on quality and productivity of LED. This scribing process causes problems like heat deformation, decreasing strength. The inner laser method, which makes a void in wafer and induces self-cracking, can overcome these problems. In this paper, cutting sapphire wafer for fabricating LED chip using the inner laser scribing process is proposed and evaluated. The aim is to settle basic experiment conditions, determine parameters of cutting, and analyze the characteristics of cutting by means of experimentation.
Design of Slide-Type Automatic Pallet Changer for M/C by Simulation
Park, Hoo-Myoung ; Jun, Jae-Uhk ; Lee, Sang-Jin ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 111~121
DOI : 10.14775/ksmpe.2015.14.6.111
The objective of this study is to develop an automatic object changer unit to improve changing process problems existing in the conventional horizontal machining center. In order to perform this objective, an upward and downward traverse unit was designed. This unit consists of a motor, reducer, chain and sprocket wheel, and an upper and lower base. This automatic object changer unit performs a sliding contact motion in a purpose built and designed frame. Constraint conditions for the upward and downward traverse unit were first designed. Then, an operation mechanism was designed and introduced as the sum of the kinetic energy for the sprocket wheel and the upper and lower base and which was based on the moment of inertia, which is the kinetic energy of the converted upward and downward traverse unit in the side of the reducer. The paper covers the design of th e Automatic Pallet Changer for th e machining center.
A Study on Optimization for Static Characteristics Analysis of Gantry-Type Machining Centers
Yoo, Deck-Sang ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 122~128
DOI : 10.14775/ksmpe.2015.14.6.122
Recently, as the demand for high efficiency, multi-function machine tools has increased, domestic machine tool industries are investing in research and development for Gantry-Type Machining centers. In this thesis, for the purpose of evaluating machining accuracy and designing a machine tool structure, a simplified model of the main frame is suggested. The results show the general characteristics of the optimum design, and the approach is shown as practicable for the preliminary design analysis and improvement of a conceptual design of a Gantry-Type Machining center. This paper`s results are expected to improve the static characteristics of Gantry-Type Machine centers. The three-dimensional finite element models proved that the modeling method might be applied to real machine tool structures.
Development of LED Module Control-based PWM Current for Control of Heat-dissipation
Lee, Seung-Hyun ; Moon, Han Joo ; Hue, Seong-bum ; Choi, Seong-Dae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 129~135
DOI : 10.14775/ksmpe.2015.14.6.129
This paper shows significant methods that improve the lifespan of LED modules as well as efficiently using an aluminum heat-sink for LED module in high power. It proposes a method that raises stability and lifespan to protect LED modules and the power unit when the LED module has been used for a long hours at high temperatures. During the research, we applied a method of pulse-width modulation (PWM) in order to prevent the phenomenon that the entire power of a system is turned off and the lifespan is reduced when the LED nodule reacts to the high temperatures. To protect the LED module and SMPS based on high efficiency, a temperature sensor is attached underneath the circuit board and the sensor measures the temperature of circuit board when the LED module is powered on. The electrical power connected to SMPS is controlled by PWM when the temperature of the LED module reaches a particular temperature.
Analytic Study on Pulsed-Laser Polishing on Surface of NAK80 Die Steel
Kim, Kwan-Woo ; Kim, Seung-Hwan ; Cho, Hae-Yong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 136~141
DOI : 10.14775/ksmpe.2015.14.6.136
Laser surface polishing is a polishing method for improving surface roughness using an integrated laser beam. Using a laser for surface polishing can improve the surface condition without physical contact or chemical action. Laser polishing has mainly been used to polish the surface of diamond or optical articles, such as lenses and glasses. Recently, diverse studies on laser polishing for metals have been conducted. The analytic study of laser surface polishing has been conducted with experimental trials for comparison, so that the proper conditions for laser polishing can be recommended. In this study, laser surface polishing was simulated in order to predict the heat-affected zone on the die steel depending on the power of the pulsed laser. The simulated results were verified by comparing them to those of the experimental trials. Through this study, therefore, the application of FEM to the selection of appropriate laser conditions could be possible.
A Review of the Fabrication of Soft Structures with Three-dimensional Printing Technology
Jang, Jinah ; Cho, Dong-Woo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 6, 2015, Pages 142~148
DOI : 10.14775/ksmpe.2015.14.6.142
3D printing technology is a promising technique for fabricating complex 3D architectures based on the CAD/CAM system, and it has been extensively investigated to manufacture structures in the fields of mechanical engineering, space technology, automobiles, and biomedical and electrical applications. Recent advances in the 3D printing of soft structures have received attention for the application of the construction of flexible sensors of soft robotics or the recreation of tissue/organ-specific microenvironments. In this review paper, we would like to focus on delivering state-of-the-art fabrication of soft structures with 3D printing technology and its various applications.