Journal of the Korean Society for Precision Engineering最新文献_第8页

Study on Controlling Material Properties of Cladded Layers Using High Temperature and Hybrid Cladding Process 高温复合熔覆工艺控制熔覆层材料性能的研究

Journal of the Korean Society for Precision Engineering Pub Date : 2023-10-01 DOI: 10.7736/jkspe.023.073

Yeong-Kwan Jo, Sang-Hu Park

引用次数: 0

Machinability Improvements of Soda-lime Glass Using Various Surface Coatings 不同表面涂层改善钠钙玻璃的可加工性

Journal of the Korean Society for Precision Engineering Pub Date : 2023-10-01 DOI: 10.7736/jkspe.023.048

Ji-Hwan Kim, Byoung-Ho Yun, Suk-Bum Kwon, Sangkee Min, Hae-Sung Yoon

{"title":"Machinability Improvements of Soda-lime Glass Using Various Surface Coatings","authors":"Ji-Hwan Kim, Byoung-Ho Yun, Suk-Bum Kwon, Sangkee Min, Hae-Sung Yoon","doi":"10.7736/jkspe.023.048","DOIUrl":"https://doi.org/10.7736/jkspe.023.048","url":null,"abstract":"Advanced engineering ceramics have been highlighted mainly owing to their superior hardness, corrosion/wear resistance, and thermal insulation performances. However, they are usually very difficult-to-cut because of their high brittleness. In light of this, ultra-precision machining has been studied to perform ductile-regime cutting in the machining of ceramics. Ductile-regime cutting can feature a smoother surface, and lower subsurface damage as the dominant material response during cutting showed ductile behavior. Researchers have investigated promoting ductileregime cutting to improve the machinability of ceramics. In this study, various coating materials were applied to the workpiece surface, and their effects on machinability improvements were explored. A total of 6 surface coatings and lubricants were applied to soda-lime glass. The critical depth of cut (CDC), the depth where the ductile-brittle transition (DBT) occurred, was increased in all coatings and lubricants, with an improved ductile cutting regime. Experimental results showed that solid coatings were more effective than liquid lubricants in enhancing the ductile cutting regime. It was thought that solid coatings induced an additional downward force by resisting material deformation and chip evacuation, thus contributing to suppression of crack opening. It is expected that this research can contribute to the machinability improvements of brittle materials.","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":"135707687","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

Thermal Runaway Characteristics Induced by Heat Abuse Conditions in 18650 Li-ion Batteries 热滥用条件下18650锂离子电池热失控特性研究

Journal of the Korean Society for Precision Engineering Pub Date : 2023-10-01 DOI: 10.7736/jkspe.022.145

Jungmyung Kim, Heesung Park

引用次数: 0

Performance Characteristics of a Soft Gripper Fabricated by Additive Manufacturing Process 增材制造软夹持器的性能特征

Journal of the Korean Society for Precision Engineering Pub Date : 2023-10-01 DOI: 10.7736/jkspe.023.082

Woojin Jeong, Chae-Young Park, Jongho Shin, In-Hwan Lee

{"title":"Performance Characteristics of a Soft Gripper Fabricated by Additive Manufacturing Process","authors":"Woojin Jeong, Chae-Young Park, Jongho Shin, In-Hwan Lee","doi":"10.7736/jkspe.023.082","DOIUrl":"https://doi.org/10.7736/jkspe.023.082","url":null,"abstract":"Soft robots, known for their flexible and gentle movements, have gained prominence in precision tasks and handling delicate objects. Most soft grippers developed thus far have relied on molding processes using high-elasticity rubber, which requires additional molds to produce new shapes, limiting design flexibility. To address this constraint, we present a novel approach of fabricating pneumatic soft grippers using thermoplastic polyurethanes (TPU) through the Fused Filament Fabrication (FFF) technique. The FFF technique enables the creation of various gripper shapes without the need for additional molds, allowing for enhanced design freedom. The soft grippers were designed to respond to applied air pressure, enabling controlled bending actions. To evaluate their performance, we conducted quantitative measurements of the gripper’s shape deformation under different air pressure conditions. Moreover, force measurements were performed during gripper operation by varying the applied air pressure and adjusting the mounting angle. The results of this study provide valuable insights into the design and control of soft grippers fabricated using TPU and the FFF process. This approach offers promising opportunities for employing soft robots in various fields and paves the way for further advancements in robotics technology.","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":"135707679","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 Electromagnetic Field and Temperature Distribution around Narrow Gap in High-frequency Resistance Welding of Steel Pipe 钢管高频电阻焊窄间隙电磁场及温度分布分析

Journal of the Korean Society for Precision Engineering Pub Date : 2023-10-01 DOI: 10.7736/jkspe.023.053

Young-Soo Yang, Kang-Yul Bae

{"title":"Analysis of Electromagnetic Field and Temperature Distribution around Narrow Gap in High-frequency Resistance Welding of Steel Pipe","authors":"Young-Soo Yang, Kang-Yul Bae","doi":"10.7736/jkspe.023.053","DOIUrl":"https://doi.org/10.7736/jkspe.023.053","url":null,"abstract":"When a narrow gap was formed under appropriate welding conditions in the steel pipe manufacturing process using highfrequency resistance welding, temperature distribution was analyzed to predict the length of the gap. Assuming the length of the gap from the apex point to the welding point at an applied voltage, and calculating the temperature distribution around the gap, the length of the gap with an appropriate fusion width at the welding point could be estimated. Along with this, the current density and magnetic flux density distributions that appeared in the narrow gap were obtained according to the change in the applied voltage, and the distribution shape and size of the electromagnetic force acting on the gap were also predicted. The current density, magnetic flux density, and electromagnetic force gradually increased along the narrow gap, showing the maximum value at the welding point. In the temperature distribution in the narrow gap, the surface of the front end began to melt at an appropriate applied voltage, and the melting width was the largest at the welding point. As the applied voltage increased, the narrow gap became longer, and the appropriate gap length appeared in proportion to the applied voltage.","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":"135707688","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 Dual-morphing Vascular Stents Using Additive-lathe Printing of Shape Memory Polymers 形状记忆聚合物增材-车床打印制备双变形血管支架

Journal of the Korean Society for Precision Engineering Pub Date : 2023-10-01 DOI: 10.7736/jkspe.023.077

Yuseok Kim, Seung-Mun Lee, Suk-Hee Park

{"title":"Fabrication of Dual-morphing Vascular Stents Using Additive-lathe Printing of Shape Memory Polymers","authors":"Yuseok Kim, Seung-Mun Lee, Suk-Hee Park","doi":"10.7736/jkspe.023.077","DOIUrl":"https://doi.org/10.7736/jkspe.023.077","url":null,"abstract":"In this study, we present the fabrication of dual-morphing vascular stents using an additive-lathe printing method and two different shape-memory polymers. Traditional additive manufacturing techniques confront significant challenges in producing vascular stents with complex, hollow, mesh-like structures due to limitations such as a flat printing bed and the placement of supports. To overcome these obstacles, we employed a lathe-type additive manufacturing system with a rotatable base substrate, enabling precise fabrication of cylindrical-shaped stents. To achieve shape transformability, we used shapememory polymers as the stent materials, offering the advantage of minimally invasive surgery. Two distinct shape-memory polymers, with different transition temperatures (35 and 55oC), were printed using the additive-lathe method. The printed stents consisted of two distinct parts that underwent dual-stage morphological changes at the different temperatures. By manipulating the printing paths, the dual-morphing properties of the stents could be adjusted in both longitudinal and circumferential directions. This innovative approach could be a solution to several limitations associated with the application of stents in diseased vascular tissues with complex shapes, facilitating minimal invasion during surgical procedures.","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":"135707684","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 Transparent Electrode based on Metallic Nanofiber Network via Combined Heat Treatment 基于金属纳米纤维网络的复合热处理制备透明电极

Journal of the Korean Society for Precision Engineering Pub Date : 2023-10-01 DOI: 10.7736/jkspe.023.075

Na-Kyoung Kim, So-Eun Kim, Doyeon Im, Seung-Mi Hong, Taechang An, Geon-Hwee Kim

{"title":"Fabrication of Transparent Electrode based on Metallic Nanofiber Network via Combined Heat Treatment","authors":"Na-Kyoung Kim, So-Eun Kim, Doyeon Im, Seung-Mi Hong, Taechang An, Geon-Hwee Kim","doi":"10.7736/jkspe.023.075","DOIUrl":"https://doi.org/10.7736/jkspe.023.075","url":null,"abstract":"With the increasing interest in research on the development of next-generation technologies such as flexible smartphones, displays, and wearable devices, interest in the development of materials and processes for transparent electrodes constituting them is also increasing. The most widely used material for manufacturing transparent devices is indium tin oxide (ITO). However, ITO is scarce, expensive, and brittle, making it is essential to replace it with new materials. In this study, we successfully fabricated a transparent electrode by electrospinning polyvinylpyrrolidone (PVP) and copper electroless deposition on the polyimide film. Especially, this study suggests a new combined heat treatment that uses both the hot plate and the convection oven. Through the combined heat treatment, the junctions between the nanofibers overlapped removed consequently reducing contact resistance. The mechanical stability of the fabricated electrode was evaluated by using a highly repeated bending test. Also, through the tape-peeling test, we confirmed that the adhesive strength of the electrode was high. This method can be applied to various polymer-based, substrate which are vulnerable to annealing process.","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":"135707683","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 Study on the Shape of Printed Circuit to Minimize Line-width Change by Film Thermoforming 利用薄膜热成型技术实现最小线宽变化的印刷电路形状研究

Journal of the Korean Society for Precision Engineering Pub Date : 2023-09-01 DOI: 10.7736/jkspe.023.069

Du-Yong Park, Ho-Sang Lee

引用次数: 0

A Study on Aerodynamic Noise Reduction Depending on UAM Main Propeller Lay-out 基于UAM主螺旋桨布局的气动降噪研究

Journal of the Korean Society for Precision Engineering Pub Date : 2023-09-01 DOI: 10.7736/jkspe.023.059

Chang-Ho Son, Jihun Song, Dong-Ryul Lee

引用次数: 0

A Study on Structural Integrity Improvement of Cargo Drone through FE Simulation and Topology Optimization 基于有限元仿真和拓扑优化的货运无人机结构完整性改进研究

Journal of the Korean Society for Precision Engineering Pub Date : 2023-09-01 DOI: 10.7736/jkspe.023.065

종섭 성, 하영 시, 범수 강, 태완 구

引用次数: 0