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정융호(Yoong-Ho Jung),소범식(Bum-Sik So),여경동(Kyong-Dong Yeo) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
본 논문에서는 5축 고속가공에 대한 가공 시간의 명가 알고리즘을 제안하였다. 가공 시간의 정확한 예측은 공정계획과 작업 일정계획에 중요한 위치를 차지하고 있다. 컨트롤러나 공구에 대한 기술의 발전이 빠르게 진행된 것과는 대조적으로 가공 시간에 대한 평가는 아직까지 NC 데이터의 길이를 지령 이송속도로 나누고 경험적인 팩터를 곱하는 전통적인 방법을 그대로 시용하고 있다. 본 연구에서는 5축 고속가공에서 정확한 가공 시간을 평가하기 위해 5축 공작기계의 실제 이송속도에 대한 동작 특성을 고려한 알고리즘을 제안하였다. 이를 위해 먼저 가공 속도와 관련된 중요한 인자들을 정의하였으며, 이를 이용하여 5축 동시 동작에서 적용 가능한 실제 이송속도에 대한 수학적 모델을 제시하였다. 또한 5축 공작기계의 실제 이송속도에 대한 특성을 측정하여 적용함으로써 3축 가공뿐만 아니라 5축 고속 가공에서도 가공 시간을 정확하게 평가할 수 있는 알고리즘을 개발하였다.
부품수가 많은 조립체 설계를 위한 조립체 중심적 모델링 방법론
정융호(Yoong Ho Jung) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
Most design changes are due to interferences and fit-up as parts are assembled if such a large product as an automobile or an aircraft is developed by many concurrent engineers.<br/> In this thesis, the assembly-centric modeling methodology with CAD systems is proposed in order to reduce the design changes. Unlike part-centric modeling method, a part is modeled with its own coordinate system which is used in dawnstream process as machining and measuring. The part coordinates initially have the same orientation as its assembly which is predefined in BOM (Bill of Material). Then, the coordinates origin of the part is moved to its location to be assembled from that of its assembly coordinate system. To implement this methodology, the position data of the part w.r.t. its assembly are stored in a database to build the same hierarchical assembling structure as BOM structure.<br/> This modeling approach has the advantage of reflecting assembling sequence, because the process of positioning parts are similar to that of real assembling. And with the method, a designer can easily adjust all of the part positions of an assembly to resolve interferences if he modifies just the assembly position. which results in moving included parts and assemblies together.<br/>
볼엔드밀 가공에서 절삭속도 일정제어기법에 의한 커넥팅로드 가공기술
강명창,정융호,김정석,문성준,김경균,Kang, Myung-Chang,Jung, Young-Ho,Kim, Jeong-Suk,Moon, Sung-Jun,Kim, Kyung-Kyoon 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.6
The purpose of this study is to suggest how the machining technique of constant control of cutting speed can improve precision machining and tool life in high speed machining using a ball end mill. Cutting speed is changed in machining fee form surfaces such as connecting rod die. So, we don't have supreme surface form and tool life on machining. To solve this problem we should settle on optimal cutting speeds in free form surface machining. And, to improve precision machining, We must execute high speed machining methods to output optimum NC data using developed constant control of cutting speed program after modeling by CAD/CAM. In this paper, a comparison was made of the cutting precision and tool life in conventional cutting and those in connecting rod machining applying the program developed.
기하학적인 방법을 이용한 3 Rotary 형식 5축 가공기의 후처리 방법
윤재득(Jaedeuk Yun),정융호(Yoongho Jung),박도현(Dohyun Park) (사)한국CDE학회 2009 한국CDE학회 논문집 Vol.14 No.5
This paper presents a post-processing algorithm for 5-axis machines with three rotary axes (3R-2L type). 5-axis machining needs the postprocessor for converting cutter location (CL) data to machine control (NC) data. The existing methods for post-processing use inverse kinematics equations from forward kinematics. However in case of 5-axis machines with three rotary axes, the inverse kinematics equations are not induced directly since the forward kinematics equations are non-linear. In order to get the joint values from the forward kinematics equations, previous algorithms use numerical method for the post-processing, which needs searching algorithms with computation time and may result in fail. This paper proposes a geometric method for the post-processing of 3 rotary type 5-axis machines. Our algorithm has three advantages: first, it does not need establishing forward kinematics equations. Second, it is reliable method that eliminates any numerical methods for the inverse kinematics, resulting in the exact solution. Finally, the proposed algorithm can also be applied to 2R-3L type of 5-axis machines.