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변문현,김태규 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.1
In this study we propose a novel approach with which design engineers can define and design free-form surface more easily. Free-form surface is defined as a parametric shape which consists of a feature section and a set of control points. Parametrically designed free-form surfaces not only have the advantage of alowing users to efficiently perform design changes, but also provide designers with a natural design environment in which they can do their work more naturally and creatively.
변문현,김태규 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.2
The objective of this study is to develop a PC level freeform surface modeling system which explicitly represents information of part geometry. In this study, freeform surface modeling system consist of three modules; freeform surface modeler, input/output modules and interface with Database. Surface modeler uses nonuniform rational B-spline(NURBS) function with nonuniform knot vector for the flexible modeling work. This presentation scheme is extended easily to represent other attributes such as machining and surface modification. In addition, interface with database is achieved, which provides a natural and efficient method for manipulating a part and improves the design environment.
특징형상 모델러를 이용한 유연공정계획 시스템에 관한 연구
변문현,민상기 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.1
This paper describes a method to automate the generation of process plans and NC codes for the finish machining in milling operations. A feature is modeled by using form feature modeler and a cutter is selected for five possible approaching directions of it by process requirement. Process requirement of a face describes the process capability specifications for machining the face. The generated process plans are flexible and may vary with the capabilities of available manufacturing facilities and desired production criteria.
비다양체 모델을 위한 자료구조와 오일러 연산의 구현 및 응용
변문현,이호영,박상호 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.2
The non-manifold geometric modeling technique enables designers to handle wireframe models, surface models and solid models in a single data structure. The Euler operation is making and deleting topological entities according to the Euler-Poincare formula, so, we can make valid models. In this study, we compose a non-manifold modeling data structure and implementation the Euler operators using the composed data structure. Data structure is based on Weiler's radial-edge data structure and Euler operation is based on Euler formuler suggested by Yamaguchi. For application, we implemented the data strucrue and the Model Editor which is composed of Euler operators by using the SGI workstation, C++ language and Open Inventor.
李永臣,卞文鉉,金東哲,閔宅基 충남대학교 공업교육연구소 1979 論文集 Vol.2 No.2
This investigation aims at raising some questions about the mechanical drawing education in technical high schools and suggesting solutions for the problems associated with them The investigation is based on the analysis of the mechanical drawing program and text materials currently employed in technical high schools. The duties of industry are also analyzed. The following recommendations are made 1. The text materials should be revised and improved. 2. A systematic pratical training course should be established. 3. Audio-visual media, e.g. , O.H.P, section model should be utilized more. 4. The level and peried of the National Qualification Examination for Technical Professions should be regulated,
민상기,변문현 忠南大學校 産業技術硏究所 1996 산업기술연구논문집 Vol.11 No.2
This paper described automatic selection of milling machine tools. The model is modeled by using form feature and each cutter is selected for five possible cutter approach directions by process requirement. Process requirement of a face describes the process capability specifications for machining the face. The optimum prcesses for machining the workpiece are selected by considering some economic production criteria.
인벌류트 베벨기어 설계를 위한 CAD화 기술에 관한 연구
조성철,변문현 忠南大學校 産業技術硏究所 1996 산업기술연구논문집 Vol.11 No.2
Computer aided design method for involute bevel gear design is developed. Method of optimization is MS(matrix search) which is developed from this study. In this method, the volume of gear pair is minimized considering the number of pinion teeth, face width and module. Design variables are pressure angle, transmitted power, gear volume, gear ratio, allowable contact stress and allowable bending stress, scoring, etc. Design method developed this study can be applied to the plane, machine tools, and automobiles.