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이재욱(Jae-Wook Lee),조정우(Jung-Woo Cho),이상곤(Sang-Kon Lee),정명식(Myeong-Sik Jeong),장진석(Jin-Seok Jang),김건우(Kun-Woo Kim),유완석(Wan-Suk Yoo) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5
In this paper, a Parallel robot which has a 20~30[kg] payloads for handling heavy weight packages is designed. Because the studied model is used for packaging logistics, so-called, ‘Pick and Place Robot’, it is important of the weight reduction design for fast response velocity and high stiffness design for operating precision. But, these two requirements, weight reduction and high stiffness, are mutually exclusive. So, first of all, the dynamics characteristics of the robot are analyzed through the multi-body dynamics analysis and secondly, the topology optimization for achieving both the weight reduction and high stiffness is conducted. Lastly, the optimized arm is applied at the parallel robot and reliability of the topology optimization is verified.
이재욱(Jae-Wook Lee),장진석(Jin-Seok Jang),이상곤(Sang-Kon Lee),정명식(Myeong-Sik Jeong),조용재(Yong-Jae Cho),김건우(Kun-Woo Kim),유완석(Wan-Suk Yoo) 대한기계학회 2015 大韓機械學會論文集A Vol.39 No.6
본 논문에서는 고 중량물을 빠르게 이송시키며 ‘Pick & Place’ 작업을 수행하는 병렬로봇의 작동 강성 최적설계에 대한 연구를 수행하였다. 20~30kg 의 고 중량물을 사용하여 특정 작업을 빠르게 수행하기 위해서는 빠른 응답속도를 위한 관성 기구부 경량 설계와 동시에 동작의 정밀도를 위한 고 강성설계가 필요하다. 하지만 요구조건인 관성 기구부 경량 설계와 고강성 설계는 상호 배타적인 관계이므로 본 연구에서는 다물체동역학 해석을 통해서 병렬로봇의 동적 거동을 분석함으로써 로봇의 작동 중에 작용하는 하중상태를 분석하였고, 상호 배타적인 두 성능을 동시에 만족시키기 위해 관성 기구부 위상 최적 설계를 수행하였다. 그리고 위상 최적설계 결과를 병렬로봇에 적용하여 그 신뢰성을 검증하였다. In this paper, the operating stiffness of a parallel robot used to handle heavy packages is optimized. Because the studied model, called a “pick and place robot,” is applied for packaging logistics, it is important for the robot to be lightweight so that it may respond rapidly and have high stiffness to allow sufficient operating precision. However, these two requirements of low weight and high stiffness are mutually exclusive. Thus, the dynamic characteristics of the robot are analyzed through multibody dynamics analysis, and topology optimization is conducted to achieve this exclusive performance. Lastly, the reliability of the topology optimization is verified by applying the optimized design to the parallel robot.
금속 3D 프린팅으로 보수된 AISI H13 금형강 마모특성 평가
이성윤(Sung-Yun Lee),이인규(In-Kyu Lee),정명식,이재욱(Jae-Wook Lee),이선봉(Seon-Bong Lee),이상곤(Sang-Kon Lee) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.4
In hot forming process, the dies in which excessive worn or crack occurs is reused after repair. Generally hot forming dies are recycled through a welding repair method. Welding repair methods are highly dependent on the skills of engineer. It causes process defects such as dimensional defects and structural defects. Recently, the metal 3D printing method has been applied to the repair of used dies. The aim of this study is to evaluate the wear characteristics of AISI H13 tool steel repaired by 3D printing method. Three kinds of wear specimens were fabricated by using 3D printing, welding, and initial material. A pin-on-disk wear test was carried out to evaluate the wear characteristics. From the result of wear test, the wear characteristics of 3D printing method was superior to that of the welded material, and was similar to that of the initial material.
강훈(Hoon Kang),이재욱(Jae Wook Lee),조정우(Jung Woo Cho),정명식(Myeong Sik Jeong),이상곤(Sang Kon Lee),장진석(Jin Seok Jang) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
A drill bit that directly transmits percussive force and torque to the rock is the core part of a rock drilling machine. For the effective drilling, the button arrangement of a drill bit should be optimized because it is the most important design factor determining drilling efficiency. Also, a quantitative method is necessary to evaluate a button arrangement for optimization of a drill bit button. Therefore we proposed a new method for the evaluation of the drill bit button arrangement using the new evaluation indices which include overlapped impact area, blank area and moment. Moreover, we verified the suitability of the proposed evaluation method by applying it to the conventional button arrangement.
천공 효율 향상을 위한 드릴비트 버튼배열 성능평가 방법
강훈(Hoon Kang),조정우(Jung Woo Cho),정명식(Myeong Sik Jeong),조용재(Yong Jae Cho),이상곤(Sang Kon Lee),이재욱(Jae Wook Lee) 대한기계학회 2015 大韓機械學會論文集A Vol.39 No.6
드릴비트는 암반에 직접적으로 타격력과 회전력을 전달함으로써 연속적으로 암반을 파쇄, 분쇄하는 천공기의 핵심 구성요소이다. 일정한 속도로 회전하는 동시에 회전축 방향으로 타격하며 암반을 파쇄하기 때문에 암반 파쇄효율을 높이기 위해서는 드릴비트의 배열 최적설계가 필요하다. 그러므로 본 연구에서는 버튼배열 최적화를 수행하기 위한 선행연구로써 버튼배열의 성능을 정량적으로 평가할 수 있는 방법에 대한 연구를 수행하였다. 버튼의 중복타격 면적, 비 타격 면적, 천공편향 모멘트와 같은 평가지표를 활용하여 버튼배열의 파쇄 효율성을 평가하였으며, 더불어 제안된 평가방법을 활용하여 기존 드릴비트 버튼배열의 파쇄 효율성을 검토함으로써 제안한 배열성능 평가방법의 적합성을 확인하였다. The drill bit, which directly transmits percussive forces and torque to the rock, is the core part of a rock drilling machine. For effective drilling, the button arrangement of a drill bit should be optimized because it is the most important design factor in determining drilling efficiency. Furthermore, a quantitative method is necessary to evaluate the button arrangement for the optimization of the drill bit button. Therefore, we propose a new method for the evaluation of the drill bit button arrangement using new evaluation indices, which include the overlapped impact area , blank area, and moment. Moreover, we verify the suitability of the proposed evaluation method by applying it to the conventional button arrangement.