• 제목/요약/키워드: Computer-aided design and computer-aided machining (CAD/CAM)

검색결과 15건 처리시간 0.019초

임상가를 위한 특집 1 - CAD/CAM 보철물의 제작 과정에서 오류가 발생할 수 있는 요소들에 대한 경험적 고찰 (The factors caused errors in the production process of CAD/CAM prosthesis based on experience)

  • 허중보;심준성
    • 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.

제트엔진 압축기 케이스의 구멍 가공을 위한 특징형상 인식 기반의 CAM 모델 자동생성 (Automatic Generation of CAM Model for Machining Holes for Jet Engine Compressor Case Based on Feature Recognition)

  • 김병철;송일환
    • 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.

임상가를 위한 특집 2 - CAD/CAM 기술을 이용한 총의치 제작의 현재와 전망 (Current status and future perspectives of CAD/CAM fabricated complete denture)

  • 박찬진
    • 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.

Improvement of Computer-Aided Manufacturing (CAM) Software for Laser Machining

  • Bayesteh, Abdoleza;Ko, Junghyuk;Ahmad, Farid;Jun, Martin B.G.
    • 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.

형상 검색을 이용한 제트엔진 절삭가공을 위한 빠른 CAM 모델 생성 방법 (A Fast Generation Method of CAM Model for Machining of Jet Engines Using Shape Search)

  • 김병철;송일환;신수철
    • 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.

Procera System의 역사적 고찰 (Procera System : a Review of Literature)

  • 신수연
    • 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.

CAD/CAM을 이용한 구두창 금형 가공 (Machining for Outsole Mold of Shoes Using CAD/CAM)

  • 박용복;염정노;황인극
    • 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.

입체 캠의 형상 설계와 가공에 관한 연구 (A Study on Design and Manufacture of Spatial Cams)

  • 김찬봉;양민양
    • 대한기계학회논문집
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    • 제17권6호
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    • pp.1361-1371
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    • 1993
  • 본 연구에서는 여러가지 입체 캠 기구에 대하여 기구학적인 구성조건과 캠 곡선을 바탕으로 매개변수형태의 포락면이론에 의하여 캠 형상을 구하고, 이를 직접 가공할 수 있는 NC 파트프로그램을 얻는 CAD/CAM 소프트웨어를 구성하여 정밀성, 생산성, 효율성 등을 증진하고자 한다.

금형 자동측정에 의한 사상맵 생성 (A Method for Generation of Grinding Map based on Automatic Mold Measurement)

  • 정남용;조진형;오현승;이세재
    • 산업경영시스템학회지
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    • 제41권4호
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    • pp.248-255
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    • 2018
  • Ensuring the quality of molds is one of the major issues in mass production. In general, securing the quality of the molds is achieved by repeating grinding and die spotting after machining the molds based on engineer's decision. However, this heuristic method is affected by the engineer's skill and working environment. Therefore, a lot of time and resources are needed in order to ensure quality. In this study, ensuring the quality of molds using grinding map which is generated using automatic measurement is proposed. An automatic measuring system based on CMM (Coordinate Measuring Machine) is developed for measuring the molds. This system generates the measurement path automatically using the 3D CAD model of products. CAD (ComputerAided-Design), CAM (Computer-Aided-Manufacturing), and CAQ (Computer-Aided-Quality) technology is integrated using DMIS (Dimensional Measuring Interface Standard) format in the automatic measuring system. After measuring the molds, a grinding map is generated using the gap between the CAD model and measured values of mold. The grinding map displays the machining tendency and the required amount of grinding with values on a 3D map. Therefore, the quality of molds can be ensured with exactness and quickness based on the grinding map. This study shows that integrating the planning, measuring, and analyzing based on computer technology can solve the problem of quality assurance of mold using the proposed method, therefore the productivity can be increased.

Evaluation of marginal discrepancy of pressable ceramic veneer fabricated using CAD/CAM system: Additive and subtractive manufacturing

  • Kang, Seen-Young;Lee, Ha-Na;Kim, Ji-Hwan;Kim, Woong-Chul
    • The Journal of Advanced Prosthodontics
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    • 제10권5호
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    • pp.347-353
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    • 2018
  • PURPOSE. The purpose of this study was to evaluate the marginal discrepancy of heat-pressed ceramic veneers manufactured using a CAD/CAM system. MATERIALS AND METHODS. The ceramic veneers for the abutment of a maxillary left central incisor were designed using a CAD/CAM software program. Ten veneers using a microstereolithography apparatus (AM group), ten veneers using a five-axis milling machine (SM group), and ten veneers using a traditional free-hand wax technique (TW group) were prepared according to the respective manufacturing method. The ceramic veneers were also fabricated using a heat-press technique, and a silicone replica was used to measure their marginal discrepancy. The marginal discrepancies were measured using a digital microscope (${\times}160$ magnification). The data were analyzed using a nonparametric Kruskal-Wallis H test. Finally, post-hoc comparisons were conducted using Bonferroni-corrected Mann-Whitney U tests (${\alpha}=.05$). RESULTS. The $mean{\pm}SD$ of the total marginal discrepancy was $99.68{\pm}28.01{\mu}m$ for the AM group, $76.60{\pm}28.76{\mu}m$ for the SM group, and $83.08{\pm}39.74{\mu}m$ for the TW group. There were significant differences in the total marginal discrepancies of the ceramic veneers (P<.05). CONCLUSION. The SM group showed a better fit than the AM and TW groups. However, all values were within the clinical tolerance. Therefore, CAD/CAM manufacturing methods can replace the traditional free-hand wax technique.