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- 저자 : 서정덕(Jung Duk So) (검색결과 3 건)
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서정덕(Jung-Duk So),정성원(Sung-Won Jung),권순구(Soon-Goo Kwon),박종민(Jong-Min Park),최원식(Won-Sik Choi),김종순(Jongsoon Kim),권순홍(Soon-Hong Kwon) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.6
This study develops an automation system for metallic mold design that is applicable in forging non-axial symmetric parts. The metallic mold design program is used to design the metallic mold using two-dimensional axial symmetric metallic molds and to predict the stress concentration using finite element analyses. Then, the program redesigns the metallic mold using variables such as the optimal split diameter, maximum allowable inner pressure, fit tolerance, and stress distribution, which are calculated using the metallic mold design program. When the involute spur gear is forged, stress concentration occurs on the tooth root bounded at the symmetric surface. The SCM4 material is suitable for metallic molds because the stress is less than the yield strength of the insert and it acts on the tooth root regardless of the inner pressure. The metallic mold for forging non-axial symmetric parts can be designed through adjusting the magnitude of the contact pressure. The program developed in this study can be applied to metallic mold designs in involute spur gears of forging, which is an ordinary non-axial symmetric part.
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권순홍(Soon Hong Kwon),정성원(Sung Won Jeong),권순구(Soon Gu Kwon),박종민(Jong Min Park),최원식(Won Sik Choi),서정덕(Jung Duk So) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
This research analyzed the growth characteristics of garlic stalks and bulbils through research articles and field survey as a preliminary, and designed and manufactured prototype garlic stalks collecting system. The overall size of the prototype garlic stalks collecting system was 1825 (L) × 570 (W) × 1362 (H) ㎜, and consisted of reaping, conveying, collection, power source, traveling, and control unit. Performance of the prototype garlic stalks collecting system was evaluated at field of crop reception and distribution complex located at Seosan City, Chungnam, Korea. Results of evaluation of reaping, conveying, and collection units were generally satisfying. Following discussions, however, is found to be considered to improve the prototype garlic stalks collecting system for better performance or some modifications to improve the system during research.
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권순홍(Soon-Hong Kwon),최원식(Won-Sik Choi),정성원(Sung-Won Chung),박종민(Jong-Min Park),권순구(Soon-Goo Kwon),서정덕(Jung-Duk So) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.6
The fluid power products are widely used in current industrial area such as automation of products and equipment assembly, high-tech machine tool, aircraft, train, and etc. As the development of industry is in progress, the development of the fluid power products is demanding and it is required in every industrial area. This research proposed a pneumatic system to evaluate displacement accuracy of the pneumatic actuator without external load and to analyze capability of integration of the valve system. The pneumatic system consisted of a combination of pneumatic actuator, four two-port valves, two three-port valves, two pressure valve, a check valve, two proximity sensors, and a program logic controller (PLC). The position controller is based on the PLC connected with the proximity sensors. The maximum air pressure applied for tests was 49.05N/㎠ and the displacement accuracy of a stroke was measured using a dial gauge. The supply- and discharge-side of air pressure and the length of the stroke of the pneumatic cylinder were varied The test of the position control of the pneumatic cylinder was carried out 50 times at each supply- and discharge-side air pressure of 24.53/34.34, 29.43/39.24, 34.34/44.15, and 39.24/49.05N/㎠ and replicated three times. The accuracy of the displacement of the pneumatic cylinder stroke increased as the supply- and discharge-side of air pressure increased with the stroke length of 133mm. Also the displacement accuracy increased as the stroke length increased with the fixed supply- and discharge-side of air pressure of the pneumatic cylinder as 34.34 and 44.15N/㎠, respectively. The most accurate displacement of the pneumatic cylinder was obtained at the supplyand discharge-side of air pressure of 39.24 and 49.05N/㎠, respectively, and strokes of 170 and 190mm.
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