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소구경 미세홈 고속가공시 가공환경변화에 따른 가공성 평가
정연행,이채문,강명창,이득우,김정석 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-
High speed machining is one of most effective technologies to improve productivity. It can give great advantage for manufacture of die and Moulds. However, when the high speed machining of materials, especially in machining of micro groove, a severely thermal demage was generated on workpiece and tool. Generally, the cutting fluid is used to improve penetration, lubrication, and cooling effect. In order to rise the performance of lubrication, it contains extreme pressure agents (CI, S, P). But the environment of work room go bad by those additive. Therefore, the compressed chilly air with Oil mist system was developed to replace the conventional cutting fluid system. This paper carried out the tests to evaluate the machinability by the cutting environment in high speed micro groove machining of NAK80 (HRC40). Compressed chilly air with oil mist was ejected on the contact area between cutting edge and workpiece. The effectiveness of this developed compressed chilly air with oil mist system was evaluated in terms of tool life. The results showed that the tool life of carbide tool coated TiAIN with compressed chilly air mist cooling was much longer than with dry and flood coolant when cutting the material.
신문식(Moonsik Shin),이대섭(Daesuep Lee),정연행(Yeonhaeng Jeong),김민진(Minjin Kim),장길화(Gilhwa Jang) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In this paper, a design and analysis for initial development dozer was studied. After the initial design, it is impossible to evaluate the sample. So, this paper proposed the method for FEM with commercial tool. And, in general working status, the motion for dozer of excavator was established by 3 kinds of case. So, it is possible to analyze the strength of parts for dozer consisted of welding part, steel part and so on. 3D modeling of dozer is made by CATIA and FEM analysis is used to MARC program.