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3D 프린팅에서 자동차용 Inner ring의 내부밀도에 따른 치수 특성
김해지(Hae-Ji Kim),김남경(Nam-Kyung Kim) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.11
Reverse engineering involves duplicating a physical part by measuring and analyzing its physical dimensions, features, and material properties. By combining reverse engineering with three-dimensional (3D) printing, engineers can simply fabricate and evaluate functional prototypes. This design methodology has been attracting increasing interest with the advent of the Fourth Industrial Revolution. In the present study, we apply reverse engineering and 3D printing technologies to evaluate a fabricated automotive inner ring prototype. Through 3D printing, inner rings of various densities were prepared. Their physical dimensions were measured with a 3D scanning system. Of our interest was the effect of inner ring density on the physical dimensions of the fabricated prototype. We compared the design dimensions and physical dimensions of the fabricated prototypes. The results revealed that even the 20% density of inner ring was effective for 3D printing in terms of satisfying the design requirements.
AIP-TiN 코팅에서 증착시간이 SKH51과 SKD11 강의 표면특성에 미치는 영향에 관한 비교 연구
김해지(Hae-Ji Kim),김남경(Nam-Kyung Kim) 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.1
In this paper, the surface characteristics of the AIP-TiN coated of the SKH51 and SKD11 steels under various deposition times are presented with emphasis on the comparison of the two materials. The micro-particle, the surface roughness, the micro-hardness, the coated layer thickness, the atomic distribution of Ti, N and Fe elements and the adhesion are measured for various deposition times. It has been shown that the micro-particle, the surface roughness, the coated layer thickness and the atomic distribution of Ti, N and Fe elements are similar for the two cases regardless of the test deposition time from 10 to 180 minutes. However, it has been shown that the micro-hardness and the adhesion of the SKH51 steel are higher than the SKD11 steel, indicating that they are much affected by the hardness of the material to be coated.
고단속 기어의 가공 시 진원도 향상을 위한 지그척 개발
김남경(Nam-Kyung Kim),배강열(Kang-Yul Bae),김남훈(Nam-Hoon Kim),장정환(Jeong-Hwan Jang) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.1
Recently, the requirements for high precision and efficiency machining are gradually increased to raise international competitiveness at the industrial fields of automotive and gears. This trend had made effects on the industrial fields in Korea and which needs further studying of high accuracy and efficiency machining. This study is to investigate the effects of Jig type chuck for roundness improvement in CNC turning machining of high stage speed gear. After hobbing machining, Dimensional change before and after heat treatment was very largely generated. In order to solve this problem was to develop a jig type chuck. After the heat treatment, the operation of the chuck which was the most distinguished equipment among Jig type chuck(0.006mm), Scroll type chuck(0.05㎜) and Bolt type chuck(0.04㎜). Therefore, Jig type chuck was satisfied the requirement from the actual field(0.02㎜).