• 대한기계학회논문집A
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• 제39권3호
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• pp.337-345
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• 2015

항공기에 사용하는 제트엔진을 생산하기 위해서는 고도의 절삭가공 기술이 필요하다. 항공기 엔진 가공업체들은 가공 시 발생할 수 있는 오류들을 방지하기 위해, CAM(computer-aided manufacturing) 기술을 도입하였다. 그러나 CAM 모델 생성을 위해서는, 작업자가 수 일에서 수 주 동안 CAD 모델을 기반으로 가공 연산을 일일이 생성해야 하는 문제가 있다. 이러한 문제 해결을 위해 본 논문에서는 CAD 모델로부터 구멍 가공 부분에 대한 CAM 모델의 자동 생성 방법을 제안한다. 이를 위해 CAD 모델에서 구멍 특징형상을 인식하고 이를 CATIA 의 가공 연산으로 변환하는 방법을 적용하였다. 또한 프로토타입 시스템의 구현을 통해 제안한 방법을 실험 및 검증하였다.

• 한국생산제조학회지
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• 제24권4호
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• pp.374-385
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• 2015

In this paper, effective and user friendly CAM software is presented that automatically generates any three dimensional complex toolpaths according to a CAD drawing. In advanced manufacturing, often it is essential to scan the sample following a complex trajectory which consists of short (few microns) and multidirectional moves. The reported CAM software offers constant velocity for all short trajectory elements and provides an efficient shift of tool path direction in sharp corners of a tool trajectory, which is vital for any laser, based precision machining. The software also provides fast modification of tool path, automatic and efficient sequencing of path elements in a complicated tool trajectory, location of reference point and automatic fixing of geometrical errors in imported drawing exchange files (DXF) or DWG format files.

• 한국CDE학회논문집
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• 제3권4호
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• pp.223-235
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• 1998

A dedicated CAM(Computer-Aided Manufacturing) system has been developed, which generated tool-path to machine Styrofoam stamping die-patterns in Chrysler Corporation. A previous process to build die-patterns was to "stick build" the pattern, in which stock is cut & glued together, and then the NC machining of part-surface shape completes building a Styrofoam die-pattern. The current process utilizes the developed CAM system, and almost removes the manual work, consequently reduces the overall lead time. The paper presents the overall system structures, tool-path generation, and some features of Styrofoam pattern machining.

• 대한치과의사협회지
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• 제52권6호
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• pp.332-345
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• 2014

In recent years, precision machining of the dental prosthesis by computer assisted system is becoming pervasive in clinical dentistry. Prosthesis fabricating system that is designed by computer software and made by computer devices is called as a CAD/CAM (Computer-Aided Design/Computer-Aided Manufacturing) system. By the use of dental CAD/CAM system, the improvement of marginal compatibility and mechanical properties in prosthesis can be obtained more effectively, an aesthetic quality by using new materials such as zirconia can be increased. Also, the restoration process can be simple and efficient, the production time can be shortened, the process of manufacture can be standardized, and the mass production is possible. What is clear is that these benefits are theoretically possible, but the dentist or dental technician must understand the CAD/CAM basic principles and limitations for obtaining the maximum advantages of CAD/CAM system. For this reason, this article will be presented about the basic principles of CAD/CAM system and the factors of error that might occur in the CAD/CAM process based on my empirical study.

• 대한치과의사협회지
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• 제52권6호
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• pp.346-353
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• 2014

Currently, computer-aided technology becomes one of main issues in clinical dentistry. About 25 years ago, the development of dental CAD/CAM systems for the fabrication of crowns and fixed partial dentures leads to be able to fabricate complete denture today. The fabrication of milled complete denture prostheses with digital scanning technology may decrease the number of patient appointments. However, the precise tooth arrangement and evaluation by patient is not promising relatively. The purpose of this review was to analyze the existing literature on computer aided technology for fabricating complete denture with historical background, current status, and future perspectives. In addition, two available commercial systems were introduced.

• 대한기계학회논문집A
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• 제40권3호
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• pp.327-336
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• 2016

항공기 엔진 제작사들은 수치제어 공작기계를 운영하고 제어하기 위해 CAM 소프트웨어를 도입했다. 그러나 CAM 모델을 생성하는 일은 긴 시간이 걸리고 오류가 발생하기 쉽다. 이는 가공연산 및 절차를 수작업으로 정의하기 때문이다. CAM 모델을 자동으로 생성하기 위해, 특징형상 인식 기술들이 오래 전부터 연구되었다. 그러나 인식 범위가 제한적이기 때문에 제트엔진과 같이 복잡한 형상에는 완전히 적용할 수 없다. 본 연구에서는 형상 검색 기술을 이용해 CAD 모델로부터 CAM 모델을 빠르게 생성하는 새로운 방법을 제안한다. 이 방법에서는, 작업자가 한 개의 가공연산을 참조연산으로 지정하면, 동일한 가공형상을 가지는 형상들을 검색하고, 참조연산을 검색된 형상들의 위치로 복사한다. 제트엔진 압축기 케이스를 대상으로 한 실험을 통해 제안한 방법을 검증하였다.

• 한국정밀공학회지
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• 제18권6호
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• pp.19-26
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• 2001

• Journal of Mechanical Science and Technology
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• 제18권8호
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• pp.1349-1357
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• 2004

Computer-Aided Inspection Planning (CAIP) is the integration bridge between CAD/CAM and Computer Aided Inspection (CAI). A CAIP system for On-Machine Measurement (OMM) is proposed to inspect the complicated mechanical parts efficiently during machining or after machining. The inspection planning consists of Global Inspection Planning (GIP) and Local Inspection Planning (LIP). In the GIP, the system creates the optimal inspection sequence of the features in a part by analyzing the various feature information such as the relationship of the features, Probe Approach Directions (PAD), etc. Feature groups are formed for effective planning, and special feature groups are determined for sequencing. The integrated process and inspection plan is generated based on the sequences of the feature groups and the features in a feature group. A series of heuristic rules are developed to accomplish it. In the LIP of Part II, the system generates inspection parameters. The integrated inspection planning is able to determine optimum manufacturing sequence for inspection and machining processes. Finally, the results are simulated and analyzed to verify the effectiveness of the proposed CAIP.

• 산업경영시스템학회지
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• 제28권1호
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• pp.24-31
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• 2005

The outsole mold of the shoes has been manufactured using electro-discharge machining by graphite electrode or using casting etc. The study is concerned with the pattern design for the outsole of shoes by CAD, the modeling and the generation of NC data by CAM system and the machining by CNC machining center. The ball end mill and the engraving cutter is used as cutter and the cutting conditions are adjusted according to the shapes and sizes of the cutter and part in cutting. The method showed the possibility coping with the rapid change of shoes industry and proposed the possibility for higher productivity and quality on mold-manufacturing of shoes outsole.

• 구강회복응용과학지
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• 제22권4호
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• pp.309-315
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• 2006

Procera system으로 제작한 금관은 여러 연구들을 통해 강도, 적합도, 심미성, 시멘트 결합강도, 생체적합성 등에서 우수한 것으로 나타났고 오랜 기간 임상 연구를 통해서도 확인되었다. 따라서 주의 깊고 신중하게 임상에 적용시 만족스러운 보철물 제작이 가능할 것이다.