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김건(Jin Jian),김희술(Hee-Sool Kin),고태조(Tae-Jo Ko) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
Multi-function and miniaturization of the medical equipment and tele-communication systems need small and high precision machined parts. For the economic machining of the small size workpiece it should be machined by small and high precision machine tools with high speed machining. The belt type driving system in turning lathe has a limitation of spindle speeds because of the vibrations from driving mechanism, Built-in type of driving mechanism is used to reduce the vibration. However, the main spindle of the built-in motor is connected directly to the motor, So the heat generation of the motor and bearing makes bad influence of the accuracy of machine tools. In this study, the analysis of heat generation from motor and bearings supporting main spindle and experiment were carried out. The results of theoretical simulation of temperature and deformation of the main spindle are good agreement with those of measured.
김건(Jin Jian),고태조(Tae-Jo Ko),김희술(Hee-Sool Kim),손재환(Jae-Whan Son) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
the demand of automobile parts is the development of the automobile industry. The worm shaft manufactured by whirling machine having large drive torque and small noise is very popular in the automobile industry. in Korea most of machining center used to make the worm shaft is using the imported components from German, Japan and other countries. The high price of this equipment will increase the price of the worm shaft. In order to improve the quality of automobile parts and to reduce the cost, it is necessary to import the substitutes of whirling machine. high rotational speed of the whirling units of whirling machine leads to generate High heat during manufacturing process . This condition will affect the accuracy of the manufacturing process of the worm shaft. In this paper the thermal analysis of whirling unit in the whirling machine was conducted in provide order to information for importing the substituted parts.
김건(Jin Jian),고태조(Tae-Jo Ko),김희술(Hee-Sool Kim) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.1
Multi-function and miniaturization of the medical equipment and tele-communication systems need small and high precision machined parts. For the economic machining of the small size workpiece it should be machined by small and high precision machine tools with high speed machining. The belt type driving system in turning lathe has a limitation of spindle speeds because of the vibrations from driving mechanism, built-in type of driving mechanism is used to reduce the vibration. However, the main spindle of the built-in motor is connected directly to the motor, so the heat generation of the motor and bearing makes bad influence of the accuracy of machine tools. In this study, the analysis of heat generation from motor and bearings supporting main spindle and experiment were carried out. The results of theoretical simulation of temperature and deformation of the main spindle are good agreement with those of measured.
다구찌 방법을 이용한 초음파 가공의 최적가공조건에 관한 연구
유군위(Jun Wei Liu),김건(Jian Jin),고태조(Tae Jo Ko),백대균(Dae Kyun Baek) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.2
초음파 가공(Ultrasonic Machining:USM)은 새로운 기계가공기술 분야 중의 하나이다. 초음파 가공 과정은 비열, 비화학, 그리고 비전도의 방법이기 때문에 공작물 재료의 물리적, 화학적 변화가 없다. 이러한 특성으로 인해 초음파 가공기술은 유리, 세라믹 등과 같은 취성재료의 가공에 적합하다. 그러나 단점으로는 초음파 진동을 이용하여 취성재료를 가공하는 경우 크랙이 빈번하게 발생한다. 본 논문에서는 유리와 세라믹의 미세 구멍가공에서 다구찌 방법을 이용하여 크랙발생을 최소화하는 최적의 가공조건을 얻고자 하였다. 이를 통해 공작물의 입구 및 출구에서 발생하는 크랙 현상을 감소시켰다. Ultrasonic machining (USM) is a new method used in metal cutting. This process does not involve heating or any electrochemical effects, causes low surface damage, has small residual stress, and does not rely on the conductivity of the workpiece. These characteristics are suitable for the machining of brittle materials such as glass or ceramics. However, the use of USM for brittle materials generates cracks on the workpiece. Therefore, in this study, Taguchi’s method was used to optimize the processing conditions of micro holes drilled in glass and ceramics. This method was used to successfully reduce the number of cracks at the entrance and the exit of the micro holes.