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RISS 인기검색어
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- 저자 : 신영삼(Young-Sam Shin) (검색결과 3 건)
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서용위(Yongwie Seo),신영삼(Young-Sam Shin) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Aluminum matrix composite A1356/SiCp(Vol. 15%)(Al MMC) material has been cut under various cutting conditions using abrasive waterjet (AWJ) machining process. The experimental cutting was carried out using three different material thicknesses of 10, 20, 30㎜ with a 0.33㎜ diameter orifice. The pump pressure, traverse rate, standoff distance(SOD) were taken as process parameters. After cutting the quality of the specimen in terms of kerf width, kerf taper, and surface finish were measured to characterize machinability of the material. As a result of the study, the maximum traverse rate for 30㎜ thick Al MMC under the pump pressure of 350 ㎫ reached up to 70 ㎜/min and the surface roughness of the material showed surface finish Ra in the range of 2.3~23.4㎛.
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구조용강의 Waterjet Peening에 의한 압축잔류응력 유발조건
서용위(Yongwie Seo),신영삼(Young-Sam Shin),윤호섭(Ho-Sup Yoon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.10
Widely used structural steel SM45C was waterjet peened in air to investigate the optimum peening conditions for the induced compressive residual stress which is beneficial to improve the fatigue strength of the material. After peening the residual stresses generated by the waterjet peening on the surface were measured using X-ray diffraction technique and the results were analyzed to characterize the peening conditions for the maximum compressive stress. Also, the surface roughnesses of peened specimen were measured and the results showed the superior surface quality with minimal changes in surface topography before and after the waterjet peening process.
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신영삼,서용위 인제대학교 2009 仁濟論叢 Vol.24 No.1
Abrasive waterjet machining (AWJM) is an emerging technology for relatively precision cutting of difficult-to-machine materials with distinct advantages of no thermal, high machinability, and small cutting forces etc. In this study, aluminum alloy AC4C has been cut under various cutting conditions using AWJM. The experimental cutting was carried out for three different material thicknesses of 10, 20, 30mm using a 1.0mm diameter nozzle. The pump pressure of 200-350 MPa, traverse rate of 20-1200 mm/min, and standoff distance(SOD) of 1-3mm were considered as process parameters. After cutting the quality of the specimen in terms of kerf width, taper, and surface finish were measured to characterize machinability of the material. Under the pump pressure of 350 MPa and SOD of 1 mm, the maximum traverse rate reached up to 1200 mm/min for 10 mm thick material, which represented superior cutting speed achievable by the AWJM technology. Although the abrasive waterjet machined surface finish was better for 10 mm thick specimen, the differences in kerf width between the jet entry and the jet exit were smaller for 30 mm thick material, which indicates larger generation of taper for thinner specimen.
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