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항공 부품 수리를 위한 DED 레이저 적층 공정 조건 및 적층 경로 최적화에 대한 연구
이재한,이춘규 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.5
Additive manufacturing is a new approach to design and production. This applies in particular to processes such as repair and rework of selected components. Additive manufacturing can produce almost any shape, and from an MRO part perspective, additive manufacturing offers tremendous advantages. The special feature of additive manufacturing is that it is particularly economical for small-volume production as the number of units is irrelevant compared to the existing manufacturing process. The purpose of this study was started from the MRO point of view, and it Identify changes and respond to the Blisk It is a study on the effect of changing the conditions on the path of the toolpath and the CAM during additive manufacturing using CAM after finding suitable conditions. metal powder.The metal powder withstands various corrosive environments and age hardening occurs very slowly. Inconel 718, which can be used in various applications such as nuclear facility-related parts, aerospace, oil facilities, turbines, and valves, was used. This is SUS 316L with good high temperature strength. The variable of the laser used in the study is the laser power, and the variables on the CAM are Operation, Stepover, Pattern, etc. In the relation between laser power and feed, when feed is specified as 500mm/min, laser power of 700W was most suitable. As for the conditions on NX CAM, ADDITIVE PROFILE Stepover was 0.8mm for Operation, and Infills and Finish for Pattern. When stacking, each layer should be overlapped with the result. Therefore, the stepover should be smaller than the laser spot size and reprocessing should be done in terms of repair, so infills and finish were applied to work larger than the actual product shape.
이재한,권준국,최영하,박동금,권오근 (사) 한국생물환경조절학회 2002 시설원예‧식물공장 Vol.11 No.2
This study was conducted to investigate the cooling efficiency and growth of tomatoes by root zonecooling device using a pad-box and cultivated system. The structure of the root zone cooling systemusing a pad-box was four piece of pads bonded on the side and a fan set at the bottom. Cool wind wasgenerated by the outside air which was punched at intervals of 10 cm along three rows. Cold windflowed to the root zone in the culture medium. The root zone cooling efficiency of cold wind genera-tion by using a pad-box flowing through a wet-pad was determined. Major characteristic of this cul-tural system consist of bed filled with a perlite medium and a ventilation pipe using PVC. The coldwind generation by a pad box (CWP) was compared to that of cold wind generation by a radiator(CWR), cold water circulation using a XL-pipe (CWX) and the control (non-cooling). When the tem-perature of water supplied was 16.2~18.4oC, temperatures in the medium were 20.5~23.2oC for CWP,22.7~24.2oC for CWR, 22.8~24.2oC for CWX and 23.1~29.6oC for the control. The results show thatthe cold wind temperature using the pad-box was lower by 1~2oC than that of cold water circulationin the XL-pipe and lower by 5~6oC than that of the control. Growth such as leaf length, leaf width,fresh weight and dry weight, was greater in three root zone cooling methods than in the control. Rootactivity was higher in the root zone cooling methods than in the control. However, there was no signif-icant difference among root zone cooling methods.