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Journal of the Korean Society of Manufacturing Process Engineers最新文献

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A Gating System Design to Reduce the Gas Porosity for Die Casting Mobile Device 降低压铸移动装置气孔率的浇注系统设计
Journal of the Korean Society of Manufacturing Process Engineers Pub Date : 2021-02-28 DOI: 10.14775/KSMPE.2021.20.02.086
J. Jang, Jun Hyung Kim, Chulhee Han
{"title":"A Gating System Design to Reduce the Gas Porosity for Die Casting Mobile Device","authors":"J. Jang, Jun Hyung Kim, Chulhee Han","doi":"10.14775/KSMPE.2021.20.02.086","DOIUrl":"https://doi.org/10.14775/KSMPE.2021.20.02.086","url":null,"abstract":"Usually, the die-cast components used in small mobile devices require finishing processes, such as computer numerically controlled coating. In such cases, porosity is the most important defect. The shape of the molten aluminum that passes through the runner and gate in a mold is the one of the factors that influences gas porosity. To define the spurt index, which numerically indicates the shape of molten aluminum after the gate, Reynolds number and Ohnesorge number are used. Before die fabrication, computer-aided engineering analysis is performed to optimize the filling pattern. Finally, X-ray and surface inspection are performed after casting and machining to evaluate how the spurt index affects porosity and other product parameters. Based on the results obtained herein, a new gating system design process is suggested.","PeriodicalId":396753,"journal":{"name":"Journal of the Korean Society of Manufacturing Process Engineers","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126735739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Dynamic Variational-Asymptotic Procedure for Isotropic Plates Analysis 各向同性板分析的动态变分渐近过程
Journal of the Korean Society of Manufacturing Process Engineers Pub Date : 2021-02-28 DOI: 10.14775/KSMPE.2021.20.02.072
Subin Lee, Chang-Yong Lee
{"title":"A Dynamic Variational-Asymptotic Procedure for Isotropic Plates Analysis","authors":"Subin Lee, Chang-Yong Lee","doi":"10.14775/KSMPE.2021.20.02.072","DOIUrl":"https://doi.org/10.14775/KSMPE.2021.20.02.072","url":null,"abstract":"The present paper aims to set forth a two-dimensional theory for the dynamics of plates that is valid over a large range of excitation. To construct a dynamic plate theory within the long-wavelength approximation, two dimensional-reduction procedures must be used for analyzing the lowand high-frequency behaviors under the dynamic variational-asymptotic method. Moreover, a separate and logically independent step for the short-wavelength regime is introduced into the present approach to avoid violation of the positive definiteness of the derived energy functional and to facilitate qualitative description of the three-dimensional dispersion curve in the short-wavelength regime. Two examples are presented to demonstrate the capabilities and accuracy of all of the formulas derived herein by using various dispersion curves through comparison with the three-dimensional finite element method.","PeriodicalId":396753,"journal":{"name":"Journal of the Korean Society of Manufacturing Process Engineers","volume":"14 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131784035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development Direction of Reliability-based ROK Amphibious Assault Vehicles 基于可靠性的韩国两栖突击车发展方向
Journal of the Korean Society of Manufacturing Process Engineers Pub Date : 2021-02-28 DOI: 10.14775/KSMPE.2021.20.02.014
Il-Seob Baek, Jusung Bong, Jang-wook Hur
{"title":"Development Direction of Reliability-based ROK Amphibious Assault Vehicles","authors":"Il-Seob Baek, Jusung Bong, Jang-wook Hur","doi":"10.14775/KSMPE.2021.20.02.014","DOIUrl":"https://doi.org/10.14775/KSMPE.2021.20.02.014","url":null,"abstract":"","PeriodicalId":396753,"journal":{"name":"Journal of the Korean Society of Manufacturing Process Engineers","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134478958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Characterization of Elliptical Dimple Fabricated with Dual Frequency Vibration Assisted Machining 双频振动辅助加工椭圆凹窝的特性研究
Journal of the Korean Society of Manufacturing Process Engineers Pub Date : 2021-02-28 DOI: 10.14775/KSMPE.2021.20.02.023
G. Park, T. Ko, R. Kurniawan, Saood Ali
{"title":"Characterization of Elliptical Dimple Fabricated with Dual Frequency Vibration Assisted Machining","authors":"G. Park, T. Ko, R. Kurniawan, Saood Ali","doi":"10.14775/KSMPE.2021.20.02.023","DOIUrl":"https://doi.org/10.14775/KSMPE.2021.20.02.023","url":null,"abstract":"Surface texturing is a promising route to reduce the friction forces between two surfaces in sliding contact. To this end, the fabrication of micro dimples is one of the most widely used surface texturing methods. According to published results, textured surfaces with elliptical micro dimples offer the best friction performance. Therefore, we fabricated elliptical micro dimples on carbon steel (SM45C) by using dual frequency vibration assisted machining. High and low frequencies of 16.3 kHz and 230 Hz were applied to the 3D resonant elliptical vibrator. The 3D resonant elliptical vibrator with a triangular cubic boron nitride insert was assembled on a computer numerically controlled turning lathe. Oval micro dimples of various profiles were manufactured on carbon steel. In terms of the profile of the elliptical micro dimples, the experimental results indicated that the average micro dimple width and depth were 112  and 7.7  . These dimensions are closely related to the cutting conditions and can be easily controlled.","PeriodicalId":396753,"journal":{"name":"Journal of the Korean Society of Manufacturing Process Engineers","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125740494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Fabrication and Performance Demonstration of the 20kW Class Inverted-type Cross-flow Turbine Based on Computational Fluid Dynamics Analysis 基于计算流体动力学分析的20kW级倒流式横流涡轮制造及性能论证
Journal of the Korean Society of Manufacturing Process Engineers Pub Date : 2021-02-28 DOI: 10.14775/KSMPE.2021.20.02.107
Sang-hwan Ham, Ji-Woong Choi, C. Jeong, Tae-Yoon Kim, Sang-Kyu Choi, G. Y. Jin, J. W. Lee, Hojin Ha
{"title":"Fabrication and Performance Demonstration of the 20kW Class Inverted-type Cross-flow Turbine Based on Computational Fluid Dynamics Analysis","authors":"Sang-hwan Ham, Ji-Woong Choi, C. Jeong, Tae-Yoon Kim, Sang-Kyu Choi, G. Y. Jin, J. W. Lee, Hojin Ha","doi":"10.14775/KSMPE.2021.20.02.107","DOIUrl":"https://doi.org/10.14775/KSMPE.2021.20.02.107","url":null,"abstract":"The cross-flow turbine is one of the most famous and widely used hydraulic power systems for a long time. The cross-flow turbine is especially popular in many countries and remote regions where off-grided because of its many benefits such as low cost, high efficiency at low head, simple structure, and easy maintenance. However, most modern turbines, including the cross-flow turbine, are unsuitable for the ultra-low head situation, known as less than 3m water head or zero head with over 0.5m/s flow velocity. In this study, we demonstrated a 20kW class inverted-type cross-flow turbine’s performance. First, we reevaluated our previous studies and introduced how to design the inverted-type cross-flow turbine. Secondly, we fabricated the 20kW class inverted-type cross-flow turbine for the performance test. And then, we designed a testbed and installed the turbine system in the demonstration facility. In the end, we compare the demonstration with its previous CFD results. The comparing result shows that both CFD and real model fitted on guide vane angle at 10 degrees. At the demonstration, we achieved 42% turbine efficiency at runner speed 125 RPM.","PeriodicalId":396753,"journal":{"name":"Journal of the Korean Society of Manufacturing Process Engineers","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130160552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of Real-time Flatness Measurement System of COF Film using Pneumatic Pressure 气动压力COF薄膜平面度实时测量系统的研制
Journal of the Korean Society of Manufacturing Process Engineers Pub Date : 2021-02-28 DOI: 10.14775/KSMPE.2021.20.02.101
Yong-Kwan Kim, Ganghan Innosys, Jaehyun Kim, I. Lee
{"title":"Development of Real-time Flatness Measurement System of COF Film using Pneumatic Pressure","authors":"Yong-Kwan Kim, Ganghan Innosys, Jaehyun Kim, I. Lee","doi":"10.14775/KSMPE.2021.20.02.101","DOIUrl":"https://doi.org/10.14775/KSMPE.2021.20.02.101","url":null,"abstract":"In this paper, an inspection system has been developed where pneumatic instruments are used to stretch the film using compressed air, thus the curl problem can be overcome. When the pneumatic system is applied, a line scan camera should be used instead of an area camera because the COF surface makes an arc by the air pressure. The distance between the COF and the inspection camera should be kept constant to get a clear image, thus the position of COF is to be monitored on real-time. An operating software has been also developed which is switching on/off the pneumatic system, determining the COF position using a camera vision, displaying the contour of the COF side view, sending self-diagnosis result and etc. The developed system has been examined using the actual roll of COF, which convince that the system can be an effective device to inspect the COF rolls in process.","PeriodicalId":396753,"journal":{"name":"Journal of the Korean Society of Manufacturing Process Engineers","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133779650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design and Fabrication of Tool Change Multi-nozzle FDM 3D Printer 换刀多喷嘴FDM 3D打印机的设计与制造
Journal of the Korean Society of Manufacturing Process Engineers Pub Date : 2021-02-28 DOI: 10.14775/KSMPE.2021.20.02.038
Ik-hyun Suk, Jongkyu. Park
{"title":"Design and Fabrication of Tool Change Multi-nozzle FDM 3D Printer","authors":"Ik-hyun Suk, Jongkyu. Park","doi":"10.14775/KSMPE.2021.20.02.038","DOIUrl":"https://doi.org/10.14775/KSMPE.2021.20.02.038","url":null,"abstract":"To cater to the transition from single-color to multicolor/multi-material printing, this paper proposes a cartridge-replacing type multi-nozzle Fused Depositon Modeling(FDM) three-dimensional (3D) printer. In the test printing run, tool change failure/wobble/layer shift occurred. It was confirmed that improper support was the cause of this tool change failure. As a solution, spline and electromagnetic cartridges were designed. Wobble was caused by machine vibration and the motor stepping out. To minimize wobble, an additional Z-axis was installed, and the four-point bed leveling method was used instead of the three-point bed leveling method. The occurrence of layer shift was ascribed to the eccentricity of the Z-axis lead screw. Therefore, slit coupler was replaced with an Oldham type. In addition to the mechanical supplementation, the control environment was integrated to prevent accidents and signal errors due to wire connections. Before the final test printing run, a rectifier circuit was added to the motor to secure precise control stability. The final test printing run confirmed that the wobble/layer shift phenomenon was minimized, and the maximum error between layers was reduced to 0.05.","PeriodicalId":396753,"journal":{"name":"Journal of the Korean Society of Manufacturing Process Engineers","volume":"26 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129537346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of Laser Heat Distribution in Al-Cu Welding 铝铜焊接激光热分布分析
Journal of the Korean Society of Manufacturing Process Engineers Pub Date : 2021-02-28 DOI: 10.14775/KSMPE.2021.20.02.001
H. Choi
{"title":"Analysis of Laser Heat Distribution in Al-Cu Welding","authors":"H. Choi","doi":"10.14775/KSMPE.2021.20.02.001","DOIUrl":"https://doi.org/10.14775/KSMPE.2021.20.02.001","url":null,"abstract":"A computer simulation was performed to study the effectiveness of temperature on the type of laser heat source in the context of the heterogeneous welding of aluminum and copper materials. Three different types of heat sources were used in the computer simulation: 1) Single Beam Straight Scan, 2) Single Beam Wobble Scan, and 3) Dual Beam Straight Scan. Among these sources, dual beam straight scan was found to be the most effective from the viewpoint of heat source control. Because the difference between the melting temperatures of copper and aluminum is approximately 400°C, a clear separation of heating temperature was required, and the dual beam straight scan provided superior controllability in this regard. When using the dual beam, the temperature of the 90:10 split was considerably easier to control than that of the 50:50 split. The optimal offset was calculated to be 4 mm off to the copper side, where the melting temperature and thermal conductivity were higher. In this manner, computer simulation was effectively used for determining the optimal laser beam hear source control without performing an actual laser welding experiment.","PeriodicalId":396753,"journal":{"name":"Journal of the Korean Society of Manufacturing Process Engineers","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117008469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Soil Characterization of the Field where Rice has been Cultivated during Five Years 五年来种植水稻的田地土壤特征
Journal of the Korean Society of Manufacturing Process Engineers Pub Date : 2021-02-28 DOI: 10.14775/KSMPE.2021.20.02.008
Eunho Cha, Jin-Kyeong Lee, M. Jang, M. Choi, Jae-Hyun Kim, Seung-Je Han, Jin-Hee Park, C. Shin
{"title":"Soil Characterization of the Field where Rice has been Cultivated during Five Years","authors":"Eunho Cha, Jin-Kyeong Lee, M. Jang, M. Choi, Jae-Hyun Kim, Seung-Je Han, Jin-Hee Park, C. Shin","doi":"10.14775/KSMPE.2021.20.02.008","DOIUrl":"https://doi.org/10.14775/KSMPE.2021.20.02.008","url":null,"abstract":"The study for soil has been conducted separately by several areas such as soil mechanics and soil chemistry. Soil is important in terms of prediction of how the plant grow with nutrient requirement. Also, soil is important for machines to work on to solve labor shortage and save farmers from harsh environment during farm work. To meet diverse needs related to soil in agriculture, the soil related study needs to be conducted synthetically. Thus, we tried to obtain the data related to soil chemistry including pH and Electrical Conductivity (EC) with data related to soil mechanics including Cone Index (CI), moisture content, soil classification. Specifically, the condition of the field was set to be cultivated at least for five years continuously at a first step. The soil was taken from 30 sites. CI was obtained using the soil penetrometer and soil classification was conducted using sieve analysis with eight kinds of sieve. The soil was taken on December when is during winter in Korea. There was variation of data including moisture content and CI.","PeriodicalId":396753,"journal":{"name":"Journal of the Korean Society of Manufacturing Process Engineers","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122658157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of Thermal Bridge Breaker to Prevent the Thermal Bridge Effect on Metal Panel Roofs 防止金属板屋顶热桥效应的热桥断路器研究
Journal of the Korean Society of Manufacturing Process Engineers Pub Date : 2021-02-28 DOI: 10.14775/KSMPE.2021.20.02.032
Sun Ho Kim, C. Jung, C. Lee, Jong Min Kim, B. Kim
{"title":"Study of Thermal Bridge Breaker to Prevent the Thermal Bridge Effect on Metal Panel Roofs","authors":"Sun Ho Kim, C. Jung, C. Lee, Jong Min Kim, B. Kim","doi":"10.14775/KSMPE.2021.20.02.032","DOIUrl":"https://doi.org/10.14775/KSMPE.2021.20.02.032","url":null,"abstract":"To realize a zero-energy building, a technology that minimizes the energy loss due to thermal bridges by preventing their formation is emerging as an important design factor. In this study, we develop a thermal bridge breaker to prevent thermal bridging in a metal panel roof and attempt to analyze the effects of its application. To this end, we fabricated a thermal bridge breaker and analyzed it in terms of its strength and heat-transfer characteristics, in addition to conducting a load simulation. The thermal bridge prevention effect of the developed thermal bridge breaker improved the insulation performance of the metal panel roof, and the results of a cooling/heating peak load simulation performed by applying the heat transmission resistance test results to a building proved the existence of this effect.","PeriodicalId":396753,"journal":{"name":"Journal of the Korean Society of Manufacturing Process Engineers","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116743483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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