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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
Design Improvement of the Driving Bevel Gear in Transmissions of a Tracked Vehicle
Jung, Jae-Woong ; Kim, Kwang-Pil ; Ji, Hyun-Chul ; Moon, Tae-Sang ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 1~6
DOI : 10.14775/ksmpe.2015.14.2.001
Transmission of a tracked vehicle designed for multiple functions such as steering, gear-shifting, and braking is a core component of heavy vehicle to which the power is transferred based on combined technology of various gears, bearing, and fluid machineries. Robustness and durability of transmission, however, have been issued due to a large number of driving units and sub-components inside its body. The bevel gears are major components for the transmission of power in a transmission. Increasing the tooth surface roughness and chamfering of the bevel gears, especially, we aim to improve the quality of transmission. In this study, design structural evaluation is conducted on bevel gears of transmission for tracked vehicle using the ROMAX-DESIGNER program. By doing so, design safety of the bevel gears has been evaluated based on the gear strength theory of ANSI/AGMA 2003 B97 standard.
A Study on Performance Improvement of Gear Type Vane Damper in Marine/Offshore FD Fan
Jang, Sung-Cheol ; Jung, Wan-Bo ; Yi, Chung-Sub ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 7~13
DOI : 10.14775/ksmpe.2015.14.2.007
In this study, we developed a gear-type vane damper which replaces the link type through a proper gear design by means of a finite element analysis. We analyzed the fluid flow according to the amount of angular displacement. torque and backlash problems were addressed in conjunction with the pinion as a structural improvement of the forced draft fan (FD FAN). Through an environmental test. Also, results nearly identical to those in the test could be drawn when using a numerical method. Finally, we compared the gear driving result with simulation results. objective of the present study is to identify a nonlinear flow rate control method for a gear-type vane damper and to propose a damper shape which offers linear flow rate control. This study is related to the development of a gear-type vane damper of the change-link type in a forced draft fan.
A Study on the Comparison of Transmission Error Prediction for a Helical Gear Pair
Kim, Lae-sung ; Zhang, Qi ; Choi, Chang ; Liang, Longjun ; Lyu, Sung-ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 14~18
DOI : 10.14775/ksmpe.2015.14.2.014
In recent years, world is faced with a transportation energy dilemma, and the transportation is almost dependent on a single fuel - petroleum. However, Hybrid Electric Vehicle (HEV) technology holds more advantages to reduce the demand for petroleum in the transportation by efficiency improvements of petroleum consumption. Therefore, there is a trend that lower gear noise levels are demanded in HEV for drivers to avoid annoyance and fatigue during operation. And meshing transmission error (T.E.) is the excitation that leads to the tonal noise known as gear whine, and radiated gear whine is also the dominant source of noise in the whole gearbox. In this paper, the analysis of gear tooth profile and lead modification is firstly presented, and then, the different transmission error of no mesh misalignment and mesh misalignment under one loaded torque for the 1st gear pair of HEV gearbox was investigated and compared. At last, the appropriate tooth modification was used to minimize and compare the transmission error of the gear pair with mesh misalignment under the loaded torque.
Study on the Teeth Grinding Condition of SCM415H Gears
Kim, Lae-sung ; Kim, Jongmin ; Choi, Chang ; Liang, Longjun ; Lyu, Sung-ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 19~24
DOI : 10.14775/ksmpe.2015.14.2.019
Gears are produced through a variety of methods. In general, a metal piece is formed into the general shape of a gear through rough cuts. The gear then moves on to a more precise machine that removes more material. Grinders work via abrasion, rubbing a rough surface against a work piece at such high speeds that it literally scrapes unwanted material away from the item. Since the grinder is spinning so fast, the material is removed very quickly. This allows a grinder to remove a very small amount without taking any unwanted material with it. This study investigates the effect of grinding process parameters like grinding spindle speed and table transfer speed on the gear grade and grinding efficiency.
Tensile Strength Properties of the Diffusion Bonding Copula Shape for Micro PCD Tool Fabrication
Jeong, Ba Wi ; Kim, Uk Su ; Chung, Woo Seop ; Park, Jeong Woo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 25~30
DOI : 10.14775/ksmpe.2015.14.2.025
This study involved the fabrication of precision machine tools using a polycrystalline diamond tip [sintered PCD and cemented carbide (WC-Co) tip] and WC-Co shanks via diffusion bonding with a paste-type nickel alloy filler metal. Diffusion bonding is a process whereby two materials are pressed together at high temperature and high pressure for a sufficient period of time to allow significant atomic diffusion to occur. For smooth progress, a filler metal of nickel alloy was used at the interface. Optical microscopy images were used to observe the copula of the bonded layer. It was confirmed that cracks occurred near the junction in all cases. The tensile strength of the bond was measured using a universal testing machine (UTM) with WC-Co proportional test specimens.
Development of Device for the Separation between Touch Panel and LCD Module
Wang, Wenping ; Park, Kyoungseok ; Shin, Dongwon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 31~37
DOI : 10.14775/ksmpe.2015.14.2.031
Recently, mobile phones have become necessary tools for everyday life. In this study, a device that can serve as a separation between a touch panel and an LCD module in a mobile phone was devised for mass repair processes at a smaill business. We used a wire cutting method to separate the bonding plate area between the modules. The device is composed of DC motors and stepping motors that can deliver a precise cutting motion. The motor control system is connected by individual control modules to a CAN network. The developed device showed excellent performance at high temperature conditions.
Study on The Status of Welded Parts According to The Types of Shielding Gas in TIG Welding
Kim, Jin-Su ; Kim, Bub-Hun ; Lee, Chil-Soon ; Kim, Yohng-jo ; Park, Yong-Hwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 38~43
DOI : 10.14775/ksmpe.2015.14.2.038
Tungsten inert gas (TIG) welding is commonly used in industries that require airtightness, watertightness, oiltightness, and precision. It is a non-consumable welding method that is commonly used for the welding of non-ferrous metals, but it can be used to weld most metals. The methods of TIG welding can be divided into three types. The first, manual welding is done directly on the metal by a welder with a torch. The second, semi-automatic welding, gets help from a material supplying machine, but it is conducted by a welder. Lastly, automated welding is conducted fully by a machine during its process and operation. Depending on the selection of electrode, the amount of heat that is applied to the base material and the electrode rod changes and makes the shape of welded parts different. A direct-current positive electrode was used for this study. Through the change of shielding gas type on a structural steel (SS-400) that is commonly used in industry, the composition and shape changes in welded parts were detected after welding. The heat-affected area, hardness value, and tensile strength were also identified through hardness testing and tensile testing. In this study, it was found that the higher hardness value of the heat-affected is, the weaker the tensile strength becomes.
A Study on Durability of Under Bar at Car through Structural and Fatigue Analysis
Han, Mu Shick ; JO, Jae-Woong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 44~50
DOI : 10.14775/ksmpe.2015.14.2.044
This study investigated the durability of the under bar of a car through structural and fatigue analysis. Model 1 had the lowest value among three kinds of models. In the case of the maximum equivalent stress and displacement at structural analysis, model 1 showed the highest durability. Also, models 3 and 2 showed structural durability in order of this value. In the case of fatigue analysis, the maximum fatigue lives of the three models were equal to
cycles. However, model 1 showed the highest value among the three models, as the minimum fatigue life of model 1 becames 92.56 cycles. Also models 3 and 2 showed fatigue durability in order of this value. The maximum possibility of fatigue damage for models1,2,and 3 became 30%. If the results of this study are applied to change the design shape of the under bar of cars, the ride comfort for automobile passengers and car durability can be improved.
Development of Automated Non-contact Thickness Measurement Machine using a Laser Sensor
Cho, Kyung-Chul ; Kim, Soo-Youn ; Shin, Ki-Yeol ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 51~58
DOI : 10.14775/ksmpe.2015.14.2.051
In this study, we developed an automated non-contact thickness measurement machine that continuously and precisely measures the thickness and warp of a PCB product using a laser sensor. The system contains a measurement part to measure the thickness in real time automatically according to the set conditions with an alignment supply unit and unloading unit to separate OK and NG products. The measurement machine was utilized to evaluate the performance at each step to minimize measurement error. At the zero setting for the initial setup, the standard deviation of the 216 samples was determined to be
. A measurement error of 0.5mm and 1.0mm as a standard sample in the measurement accuracy assessment was found to be 2.48% and 2.28%, respectively. In the factory acceptance test, the standard deviation of 1.461mm PCB was measured as
, with a
of 1.2. The automatic thickness measurement machine developed in this study can contribute to productivity and quality improvement in the mass production process.
Characteristics of Surface Roughness Based on Wire Vibration and Wire-cut Electric Discharge Machining of Aluminum Alloy 6061 (I)
Ryu, Cheong-Won ; Choi, Seong-Dae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 59~66
DOI : 10.14775/ksmpe.2015.14.2.059
The production of high value-added products requires efficient processing and this constant demand for complex shape processing has led to the need for hybrid processing. In this study, the surface characteristics of hybrid machining, which combines wire-cut E.D.M and vibration, are examined. The selected experimental parameters are verticality, waveform, amplitude, peak current and frequency. The experimental results provide a guideline for selecting reasonable machining parameters. Surface roughness was improved by increasing the amplitude of the vibration.
A Study on the Thermal Characteristics of Dry Vacuum Pump with Vertical Screws
Chang, Moon-Suk ; Park, Jae-Hyun ; Kim, Soo-Tae ; Kim, Il-Gon ; Cho, Seong-Jin ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 67~74
DOI : 10.14775/ksmpe.2015.14.2.067
In this study, analysis and experiments were carried out on temperature distributions and thermal deformations in a dry vacuum pump with vertical screws for safe operation. When a vacuum pump is working, it is necessary to get rid of the heat generated by the friction of bearings and the compression of air to prevent the vacuum pump from being damaged by interference between two screws and housing through thermal deformation. Additional cooling was proposed by using oil flow through the inner channel of the rotating axis for lower temperature control of the vacuum pump. Analysis and experimental results were compared in terms of temperature distribution and thermal deformation of the vacuum pump, and two sets of results matched reasonably well. These results for a dry vacuum pump with vertical screws can be used in similar model development and can minimize errors in design and manufacture by providing reasonably accurate prediction in advance.
Fatigue CAE Analysis of a Rebar Bending Machine Roller
Shin, Yu-Jeong ; CHoi, Chang-Hwan ; Lee, Sung-gun ; Kim, Jin-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 75~80
DOI : 10.14775/ksmpe.2015.14.2.075
The rebar factory production process involves the repetitive bending of rebars. Therefore, the fatigue failure of the rebar bending machine needs to be considered. In this paper, fatigue analysis of the rebar machine was performed using the commercial software DAFUL, which is based on MFBD (Multi Flexible Body Dynamics). The rotating roller, fixing roller and rebar were modeled by the finite element method. The rebar bending process is simulated and the mechanical stresses on the rollers are calculated. Structural analysis of the rebar bending roller was performed using the maximum bending angle of
and maximum processing rebar diameter of
. Then, for fatigue analysis, the S-N curve of STD-11 was. The fatigue life of rollers is estimated by modified Goodman diagram. The fatigue life range of the rotating roller is
while that of the fixed roller is
. STD-11 has an infinite life cycle after
. Therefore, the rollers of the rebar bending machine may be expected to suffer fatigue failure. Thus, we performed a parameter study of fatigue life according to various axial radii of the fixed roller and rotating roller, and redesign of the rebar bending machine. Consequently, the axial radius of the fixed roller and rotating roller was found to be 35~37.5mm and 30~35mm, respectively, and an infinite life cycle was confirmed at these.
Electromagnetic Interference Shielding Effectiveness of Hybrid Conductive Fabrics
Han, Gil-Young ; Kim, Ki-Yeol ; Yun, Tae-Soon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 81~86
DOI : 10.14775/ksmpe.2015.14.2.081
This study investigated electromagnetic interference (EMI) shielding effectiveness (SE) of hybrid conductive fabrics. The coaxial transmission line method was used to measure the EMI Shielding effectiveness of the conductive fabrics. We designed and constructed a measuring system, consisting of a network analyzer and a device that serves as a sample holder and at the same time as a transmission medium of incident electromagnetic waves. The measurements of SE were carried out in a frequency range from 100 MHz to 2 GHz. The results of the EMI shielding experiments showed that the maximum electromagnetic shielding effectiveness (EMSE) values of sandwich type C/A/C (carbon fiber sheet/aluminum foil tape/carbon fiber sheet) and C/Ni/C (carbon fiber sheet/magnetic shielding foil/carbon fiber sheet) samples were 55 dB and 113 dB, respectively, at a frequency of 1.9 GHz.
A Study on Plastic Injection Molding of a Metallic Resin Pigment using a Rapid Heating and Cooling System
Lee, Gyu-Sang ; Jin, Dong-Hyun ; Kwak, Jae-Seob ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 87~92
DOI : 10.14775/ksmpe.2015.14.2.087
The injection molding process is widely used in the production of most plastic products. In order to make metal-colored plastic products like those found in modern luxury home alliances, metallic pigments are mixed with a basic resin material for injection molding. However, process control for metal-colored plastic products is extremely difficult due to the non-uniform melt flow of the metallic resin pigments. In this study, the effect of process parameters on the quality of a metal-colored plastic product is evaluated. A rapid mold cooling method using a compressed cryogenic fluid is also proposed to decrease the content of undesired compounds within the plastic product.
Retardation Analysis of Plastic Optic Lens according to Injection Speed Variation
Park, Soo-Hyun ; Kim, Tae-Kyu ; Kwak, Tae-Soo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 93~98
DOI : 10.14775/ksmpe.2015.14.2.093
This study focuses on simulation technology in the injection molding process for plastic optic lenses. The CAE program 3D TIMON was used to predict retardation, flow patterns and warpage deformation. The results were compared to the results of optic lenses as measured using the WPA-100 retardation measurement device with injection molding CAE for retardation predictions. According to the analysis and measured results, the distributions of retardation between the CAE results and the measurement results were similar. It was also confirmed that varying the injection speed had an effect on the injection pressure, warpage deformation and retardation distribution. As the injection speed increases, the injection pressure also increases and warpage deformation decreases. However, as the injection speed increases, the retardation distribution deteriorates.
Effect on the Stress and Displacement of Aluminum Profiles Fastening Method
Hur, Jang-Wook ; Shin, Baek-Cheon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 99~104
DOI : 10.14775/ksmpe.2015.14.2.099
This study analyzed the effects on displacement and stress as a result of improving the profile fastening method targeting rectangular-shaped and cube-shaped specimens. For the rectangular-shaped specimens, the improved fastening method reduced maximum displacement to 41.7% and maximum stress to 18.3% compared to the existing fastening method. For the cube-shaped specimens, maximum displacement and maximum stress results were found to be similar to those of the rectangular-shaped specimens. Thus, as a result of comparing the stress and displacement of the existing and improved fastening methods, it was found that the improved fastening method is superior to the existing fastening method in terms of load support.
A VPG Integration System for Development of an Ultra Lightweight Control Arm
Kim, Jong-Kyu ; Kim, Geun-Yeon ; Lee, Kwon-Hee ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 105~111
DOI : 10.14775/ksmpe.2015.14.2.105
Car manufacturers and part manufacturers each have their own criteria with regard to strength, stiffness and NVH performance levels. Part manufacturers typically investigate such performances according to the part unit. To do this, the part manufacturer receives information from the relevant car maker. However, the information provided by the car maker is limited, making it difficult to develop a part which meets all of the design requirements specified by the car unit overall. To overcome this difficulty, the utilization of a VPG system is recommended for the designer. In this study, the durability performance of an optimized control arm as suggested in a previous study was investigated using the ETA-VPG, LS-dyna and FE/safe software packages. ETA-VPG provides several types of suspension and steering parts. In this study, a complete car is created using the library included in ETA-VPG, with the exception of the control arm. We also conducted a virtual proving ground analysis to predict the life cycle of the control arm.
A Fracture Mechanic's Study for Crack Growth Retardation Phenomenon using Effective Plastic Zone Concept
Kang, Yong-Goo ; Lee, Tae-Won ; Park, Chang-Yong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 112~120
DOI : 10.14775/ksmpe.2015.14.2.112
In this study, the growth rate of surface cracks (da/dN) during the retardation period was analyzed in terms of effective stress intensity factor range(
) obtained by using the proposed effective plastic zone concept. Effective stress intensity factors obtained by using the effective plastic zone concept were smaller than those obtained by using Willenborg analysis. On the growth rate of surface cracks analyzed by
, the dependence of overload stress levels appears. On the growth rate by
obtained by Willenborg analysis, there is a linear relationship with two different slops between da/dN and
. However, on the growth rate by
obtained by the proposed effective plastic zone concept, there is a linear relationship between da/dN and
that coincides with the results of constant amplitude loading.
Development of a Tool for Automation of Analysis of a Spindle System of Machine Tools
Choi, Jin-Woo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 121~126
DOI : 10.14775/ksmpe.2015.14.2.121
In this research, a tool was developed for the rapid performance of three-dimensional finite element analysis (3D FEA) of a machine tool spindle system made of a shaft and bearings. It runs the FEA with data, such as the bearing stiffness and the coordinates of the points, to define the section of the shaft, bearing positions, and cutting point. developed for the spindle system and then implemented with the tool using an object-oriented programing technique that allows the use of the objects of the CAD system used in this research. Graphic user interfaces were designed for a user to interact with the tool. It provides rapid evaluation of the design of a spindle system, and therefore, it would be helpful to identify a near optimal design of a spindle system based on, say, static stiffness with design changes and, consequently, FEA.
Automation of One-Dimensional Finite Element Analysis of a Direct-Connection Spindle System of Machine Tools Using ANSYS
Choi, Jin-Woo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 14, issue 2, 2015, Pages 127~133
DOI : 10.14775/ksmpe.2015.14.2.127
In this study, an analytical model was developed for one-dimensional finite element analysis (1D FEA) of a spindle system of machine tools and then implemented to automate the FEA as a tool. FEA, with its vibration characteristics such as natural frequencies and modes, was performed using the universal FEA software ANSYS. VBA of EXCEL was used to provide the programming environment for its implementation. This enabled graphic user interfaces (GUIs) to be developed to allow interactions of users with the tool and, in addition, an EXCEL spreadsheet to be linked with the tool for data arrangement. The language of ANSYS was used to develop a code to perform the FEA. It generates an analytical model of the spindle system based on the information at the GUIs and subsequently performs the FEA based on the model. Automation helps identify the near-optimal design of the spindle system with minimum time and efforts.