http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
고태조(Tae Jo Ko),정종운(Jong Woon Jeong),정병묵(Byeong Mook Chung),김희술(Hee Sool Kim) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.11
Micro-machine tool is essential in the micro/meso cutting for the sake of saving of space, resources, and energy. In this research, a micro-turning lathe was fabricated with piezoelectric feed drive mechanism, and motion of each axis 'was generated by stepwise mechanism with two piezo actuators. The resolution to drive the axis was 0.05 ㎛ and position accuracy less than 2 ㎛ was assured. From the positioning experiment, piezo feed mechanism is good enough for the micro machine tools. Many turning experiments were carried out with diamond-cutting tools to evaluate cutting capability of a machine tool. Continuous flow type chip could be obtained even if the cutting speed was very low due to small diameter of workpiece. However, thorough investigation about machineability in micro/meso cutting is inevitable to assure high quality surface roughness in micro machine tool.
소재제거율을 일정하게 한 NURBS 보간기에서 절삭성 고찰
고태조(Tae Jo Ko),김희술(Hee Sul Kim) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.12
Increasing demands on precision machining of 3D free-form surface have necessitated the tool to move smoothly with varying feedrate. To this regard, parametric interpolators such as NURBS (Non-Uniform Rational B-Spline) interpolator have been introduced in CNC machining system. Such interpolators reduce the data burden in NC code, increase data transfer rate into NC controller, and finally give smooth motion while machining. In this research, a new concept to control cutting load in NURBS interpolator was tried based on the curvature of curve. This is to protect cutting tool, and to have good machinability. For proof of the system, cutting force and surface topography were evaluated. From the experimental results, the interpolator is good enough for machining a free-form surface.
고태조(Tae Jo Ko),박동진(Dong Jin Park),김희술(Hee Sool Kim) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.1
Abrasive jet machining (AJM) has been traditionally used for removing rusts or paints. Nowadays, this is promising technology for micro bulk machining where brittle substrate materials are used. In order to get accurate details, masks such as metal, polymer or elastomer is inevitable. Among them, photo polymer which is sensitive to the light has been attractive for it's high accuracy using photolithography. In this research, SU-8 as a photo polymer is used since it is adequate for making thick mask. So, this paper describes how to make AJM masks using SU-8 with a photolithography process, and investigates the characteristics of SU-8 masks during AJM process. Also, an example of fabrication using AJM was shown.