Journal of the Korean Society for Precision Engineering最新文献_第7页

Study on Comparison of Friction Force between Ball- and Roller-LM Guides 滚珠-滚子- lm导轨摩擦力比较研究

Journal of the Korean Society for Precision Engineering Pub Date : 2023-11-01 DOI: 10.7736/jkspe.023.047

Hyeon-Jeong Ra, Dong-Wook Kim, Jun-Man Lee, Han-Seon Ryu, Jae-Han Joung, Young-Hun Jeon

{"title":"Study on Comparison of Friction Force between Ball- and Roller-LM Guides","authors":"Hyeon-Jeong Ra, Dong-Wook Kim, Jun-Man Lee, Han-Seon Ryu, Jae-Han Joung, Young-Hun Jeon","doi":"10.7736/jkspe.023.047","DOIUrl":"https://doi.org/10.7736/jkspe.023.047","url":null,"abstract":"The linear motion guideway (LM guide) is one of the key parts of precision motion and positioning, and it requires high straightness, form accuracy, stiffness, and surface quality. LM guides are actively used in manufacturing facilities for automobiles, aerospace, optics, semiconductors, robots, displays, and portable communication equipment. At present, most of LM guides are based on rolling contact, using either balls or rollers. Roller LM guides have been in high demand in recent years in various industrial fields that require high rigidity. In this study, the friction characteristics of ball and roller LM guides with the same rail width were compared, and friction behavior was analyzed. An experimental setup consisting of a driving unit, specimen, force sensor, and signal acquisition unit was constructed, and signals were collected under various conditions. Three lubrication conditions were used: no lubrication (dry surface), ISO-VG 32, and 68, and a wide feed-rate range from 1 to 100 mm/s was selected. The experimental results showed that the ball LM guide and the roller LM guide had significantly different friction characteristics, which were analyzed from the aspect of Stribeck curve components. In conclusion, friction behavior differed according to lubrication conditions in the no-payload state of the ball and roller LM guides, and the effect of lubrication conditions on friction behavior was shown.","PeriodicalId":37663,"journal":{"name":"Journal of the Korean Society for Precision Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135715456","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

Anomaly Detection in a Combined Driving System based on Unsupervised Learning 基于无监督学习的组合驾驶系统异常检测

Journal of the Korean Society for Precision Engineering Pub Date : 2023-11-01 DOI: 10.7736/jkspe.023.068

Kichang Park, Yongkwan Lee

{"title":"Anomaly Detection in a Combined Driving System based on Unsupervised Learning","authors":"Kichang Park, Yongkwan Lee","doi":"10.7736/jkspe.023.068","DOIUrl":"https://doi.org/10.7736/jkspe.023.068","url":null,"abstract":"Anomaly detection models using big data generated from facilities and equipment have been adopted for predictive maintenance in the manufacturing industry. When facility faults or defects occur, different patterns of abnormal data are shown owing to their component behaviors. By detecting these pattern changes, it is possible to determine whether a facility abnormality occurs. This study evaluated the anomaly detection results from a combined driving system consisting of three driving motors for about six months at a manufacturing site. The learning data with an autoencoder model for about a month at the beginning of vibration data collection and continuous monitoring of anomalies using reconstruction errors showed that a component defect occurred in one driving motor, and the reconstruction error increased progressively about three months earlier than a facility manager found the failure. In addition, the micro-electro-mechanical systems sensor showed high amplitude in the entire frequency domain when high reconstruction errors occurred. However, the integrated electronics piezoelectric sensor showed different patterns as high amplitude in a specific frequency domain. The results of this study will be helpful for detecting facility abnormalities in combined driving systems using vibration sensors.","PeriodicalId":37663,"journal":{"name":"Journal of the Korean Society for Precision Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135715458","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

Fabrication of Platinum-Samarium Doped Ceria Composite Cathode Using Sputtering Technique 用溅射技术制备掺杂铂钐铈复合阴极

Journal of the Korean Society for Precision Engineering Pub Date : 2023-11-01 DOI: 10.7736/jkspe.023.049

Yongchan Park, Davin Jeong, Hyeontaek Kim, Hyeongmin Kim, Soonwook Hong

引用次数: 0

Design and Dynamic Characteristics Analysis of Rotating Welding Torch with Ball Joint Type Mechanical Seal structure 球接头式机械密封结构旋转焊枪设计及动态特性分析

Journal of the Korean Society for Precision Engineering Pub Date : 2023-11-01 DOI: 10.7736/jkspe.023.063

Dong-Jun Lee, Jung-Min Kim, Chul-Soo Jeong, Sangrok Jin

引用次数: 0

Research on Dry Cooling and Processing Precision in Ultra-precision Machining 超精密加工中干冷却与加工精度的研究

Journal of the Korean Society for Precision Engineering Pub Date : 2023-11-01 DOI: 10.7736/jkspe.023.112

Gyung-Il Lee

{"title":"Research on Dry Cooling and Processing Precision in Ultra-precision Machining","authors":"Gyung-Il Lee","doi":"10.7736/jkspe.023.112","DOIUrl":"https://doi.org/10.7736/jkspe.023.112","url":null,"abstract":"Recently, with the development of the space, mobility, semiconductor, and precision machinery industries, the processing of precision mechanical parts has been recognized as an important and a high value-added technology. Research on ultra-precision processing is actively underway to produce such products. In addition, eco-friendliness and 0% carbon are emerging as key keywords in modern industrial society, and the need for this is also increasing in the ultra-precision processing field. As the industry advances, environmental issues are becoming a major concern, and in the processing technology field, environmental destruction caused by cutting oil is becoming an issue. To solve this problem, this study measured the movement precision of the global feed system and instaled a Fine Servo that corrects the nm-level movement of the feed system in real time, using a piezoelectric actuator, to finely drive the cutting tool to control the movement necessary for machining. We intended to control variables for ultra-precision machining and measure cutting heat generation in real time to establish a dry cooling method using thermoelectric elements without using cutting oil.","PeriodicalId":37663,"journal":{"name":"Journal of the Korean Society for Precision Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135715455","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 Inverse Kinematics for Legged Walking and Skated Driving with Hybrid Mobile Robot 混合动力移动机器人腿行滑驱动逆运动学分析

Journal of the Korean Society for Precision Engineering Pub Date : 2023-11-01 DOI: 10.7736/jkspe.023.067

Chang-Soon Hwang, Ho Lee, Bo-Yeong Kang

引用次数: 0

Study on of Friction and Degradation Characteristics of TPV Glass Run Channel TPV玻璃流道的摩擦与降解特性研究

Journal of the Korean Society for Precision Engineering Pub Date : 2023-11-01 DOI: 10.7736/jkspe.023.078

Su-Bin Cha, Junho Bae, Koo-Hyun Chung

引用次数: 0

Evaluate the Activation Effect according to the Voltage Range 根据电压范围评估激活效果

Journal of the Korean Society for Precision Engineering Pub Date : 2023-10-01 DOI: 10.7736/jkspe.023.056

Jung-Soo Kim, Gu Young Cho, Ho-Jun Yoo, Ji-Woong Jeon, Dong-Kun Song, Ye-Rim Kwon, Young-Jo Lee, Seung Hyeok Hong, Su Min Lee, Da Hye Geum

引用次数: 0

A Comparative Analysis of AEH (Asymptotic Expansion Homogenization) Results and Experimental Findings of Various Additive Manufactured Lattice Structures 不同加性制造晶格结构的渐近膨胀均质化结果与实验结果的比较分析

Journal of the Korean Society for Precision Engineering Pub Date : 2023-10-01 DOI: 10.7736/jkspe.023.071

Lopez Reyes Rigoberto, Min-Soo Ghim, Young-Sam Cho

{"title":"A Comparative Analysis of AEH (Asymptotic Expansion Homogenization) Results and Experimental Findings of Various Additive Manufactured Lattice Structures","authors":"Lopez Reyes Rigoberto, Min-Soo Ghim, Young-Sam Cho","doi":"10.7736/jkspe.023.071","DOIUrl":"https://doi.org/10.7736/jkspe.023.071","url":null,"abstract":"Recently, the demand for lightweight open-pore lattice structures with specific stiffness is increasing in many fields, such as the aeronautical, automotive, mechanical and bone tissue engineering sectors. For each concrete application, there is a need to predict its mechanical properties precisely and efficiently. There are several methods used to analyze the mechanical properties of lattice structures. Among them, the asymptotic expansion homogenization method is a more advantageous approach over the experimental, theoretical, and finite element methods, because it handles some of their limitations such as the time-consuming process, size effect, and the high amount of computational resources needed. Therefore, in this work, we use the asymptotic expansion homogenization method to perform a systematic parametric study to calculate the effective stiffness of different open-pore lattice structures. In addition, the designed models were fabricated using an SLA 3D printer, and the effective stiffness of the fabricated specimens was tested via UTM experiment to validate the numerical results computed by the asymptotic expansion homogenization method. Consequently, it was proved that this method is precise and effective for predicting the mechanical properties of lattice structures.","PeriodicalId":37663,"journal":{"name":"Journal of the Korean Society for Precision Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135707686","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 on Fabrication of Closed-cell Aluminum Foam Using Directed Energy Deposition 定向能沉积法制备闭孔泡沫铝的研究

Journal of the Korean Society for Precision Engineering Pub Date : 2023-10-01 DOI: 10.7736/jkspe.023.076

Hwa-Jeong Kim, Do-Sik Shim

{"title":"Study on Fabrication of Closed-cell Aluminum Foam Using Directed Energy Deposition","authors":"Hwa-Jeong Kim, Do-Sik Shim","doi":"10.7736/jkspe.023.076","DOIUrl":"https://doi.org/10.7736/jkspe.023.076","url":null,"abstract":"In this study, based on directed energy deposition (DED) technology, one of the additive manufacturing technologies, a porous material fabricated by mixing various aluminum alloys and foaming agent was manufactured. First, the foaming agent formed pores inside the deposited materials and differences in foaming characteristics were observed depending on the type of aluminum. Also, the foaming characteristics according to the laser power, which is a representative process variable, were analyzed. As a result, a closed-cell porous material with a maximum porosity at a laser power of 1,100 W was manufactured. Results of the compression test showed that the porous material made by the pores generated therein collapses to absorb energy, and the internal pores disappear to become high density. Therefore, Young’s modulus and yield stress were reduced by the pores inside the sample of pure aluminum and Al6063. However, it was found that the specific energy absorption, which is an advantage of the foamed materials, increased compared to non-porous materials. The findings of this study confirmed that it was possible to manufacture DED-applied foam materials using aluminum powder and a foaming agent.","PeriodicalId":37663,"journal":{"name":"Journal of the Korean Society for Precision Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135707680","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