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차승환(Seung-hwan Cha),하병철(Byeong-Cheol Ha),양동호(Dong-Ho Yang),박상현(Shang-Hyun Park),이종찬(Jong-Chan Lee) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.3
Alumina, a typical ceramic material used for semiconductors and display parts, is the subject of research and development efforts for mineral material processing. Alumina is extremely difficult to process since it is brittleness to either fine ceramics material. We have studied the shape of diamond particles and their use in machinability for alumina processing. Our study was carried out under various processing conditions, including cutting speed, table speed, and the surface roughness of the work piece. We also analyzed the wear characteristics of the tool by total cutting.
A Study on the Performance of Cermet Reamer for Transmission Parts
Jun Hyun Cho(조준현),Byeong Cheol Ha(하병철),Jong Chan Lee(이종찬) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.5
In this study, Cermet Reamers for planet carrier was manufactured and the machining characteristics were analyzed through processing experiment. Cermet reamer with ∅14, ∅15, ∅18, and ∅21mm was used and machining characteristics were compared and analyzed by observing tool wear, machining hole dimensions and surface roughness. In the flank wear of the tool, the result is less than 0.2mm, which is the target value for each tool size. The experimental results of the machining hole dimensions show the results of the process control range of 3/100 or less according to the size of the tool. Also, the surface roughness measurement result showed a value of less than 0.5 μm in the process control range for each tool size. As a result of observing the experimental results of each ∅, the results satisfied the process standard in both the tool wear, the machining hole dimension and the surface roughness.
Core in Core 냉각기술을 적용한 플라스틱 사출성형 특성에 관한 연구
최윤서(Yun-Seo Choi),박인승(In-Seung Park),양동호(Dong-Ho Yang),하병철(Byeong-Cheol Ha),허만우(Man-Woo Heo),이종찬(Jong-Chan Lee) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.3
Recently, plastic materials have become more diversified, and the development of materials with excellent mechanical properties and plasticity has enabled wider application, miniaturization, and refinement of injection molded products. As a result, the utilization of these products in household goods, electronics, automotive parts, and aircraft parts is increasing in almost all industries. Injection molded parts are often used externally on finished commercial products. This means that the injection mold industry is very important to the value of these products. For this reason, the industry is performing research on the precision and efficiency of the injection molding process. In this study, we investigated the applicability of the core in core cooling method to the problem of product deformation due to temperature variation in existing injection mold designs. We also characterized the cooling performance of an injection mold when using this cooling method.
박휘근(Hwi-Keun Park),박상현(Sang-Hyeon Park),박인승(In-Seung Park),양동호(Dong-Ho Yang),차승환(Seung-Hwan Cha),하병철(Byeong-Cheol Ha),이종찬(Jong-Chan Lee) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.1
Silicon carbide (SiC) is used in various semiconductor processes because it has superior thermal, mechanical, and electrical characteristics as well as higher chemical and corrosion resistance than existing materials. Due to these characteristics, various manufacturing technologies have been developed for SiC. A recent development among these technologies is Chemical Vapor Deposition SiC (CVD-SiC). Many studies have been carried out on the processing and manufacturing of CVD-SiC due to its different material characteristics compared to existing materials like RB-SiC or Sintered-SiC. CVD-SiC is physically stable and has excellent chemical and corrosion resistance. However, there is a problem with increasing the thickness, because it is manufactured through a deposition process. Additionally, due to its high strength and hardness, it is difficult to subject to machining.