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경화된 열경화성 수지와 고분자재의 혼합성형에 관한 특성
김석호,윤한기,여홍태 東義大學校産業技術開發硏究所 1998 産業技術硏究誌 Vol.12 No.-
For the purpose of recycling the rigid thermosets, this study investigated the film of thermoplastic mixed with some weight fraction of rigid phenol in the hot compression molding at temperature of 200℃. The results abtained are as follows; the tensile stress according to the weight fraction of phenol particle is linearly proportional to the strain upto 2% of strain, the more the grain fraction of phenol is, the smaller the stress and strain is at frature, in case of the same weight fraction of phenol, the stress and strain of large grain is larger than those of small grain.
허관도,여홍태 동의대학교 산업기술개발연구소 2001 産業技術硏究誌 Vol.15 No.-
This study is concerned with the analysis of deformation to make an aluminum long-neck flange by cold extrusion and upsetting processes. The process of deformation was analysed using DEFORM(a commercial rigid-plastic FEM code) to get informations such as distributions of effective strain, metal flow and the relationship between load and punch stroke on the variation of semi-extrusion angle. The diameter ratios of a prestressed die with one stress ring have been also considered to determine the dimension of each ring. In the results, it is found that the initial extrusion load as well as the final load increases according to the increase of semi-extrusion angle. Especially, at the final extrusion stage, the increase of semi-extrusion angle makes high the effective strain near the outer surface of workpiece along the longitudinal direction, but punch stroke is decreased. In flange forming by upsetting process, the variation of semi-extrusion angle does not affect much forming load, but the increase of semi-extrusion angle reduces the region of high deformation and punch stroke. It is also found that the maximum separated distance from mandrel to workpiece is linearly decreased by increasing semi-extrusion angle. Therefore, it is possible to control the parameters such as forming load, punch stroke, and effective strain, which have effect on the manufacturing process and product quality, by changing semi-extrusion angle.