• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 1997.10a
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• pp.207-212
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• 1997

The purpose of this study is the development of CAM system which can cut and measure any shape by machining center and coordinate measuring machine. The overall goal of the CAM system is to achieve the CNC machining, from digitizing through to final cutting. The hardware of the system comprises PC and machining center, CMM. There are three steps in the CNC machining, (1) workpiece measuring on the CMM, (2) geometric modeling by the CAD system, (3) NC commands generation by the tool path compensated for tool nose radius. It is developed a software package, with which can conduct a micro CAM system in the PC without economical burden.

• Journal of the KSME
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• v.33 no.4
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• pp.330-342
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• 1993

CAD/CAM이 국내에 도입되기 시작한 것은 70년대 후반이나, 본격적으로 보급되어 사용되기 시작한 것은 80년대 초부터라 하겠다. 도입초기에는 설계의 획기적인 변화를 약속해주는 새로운 기술로 각광을 받아오고, 또한 몇몇 분야에서는 그만한 가능성을 보여주기도 하였으나, 설계실 에서 컴퓨터가 제도판을 밀어내기 시작한지 약 10년이 지난 이 시점에서 돌이켜보건대 과연 CAD/CAM이 초기의 커다란 기대에 부응하는 성과를 올리고 있는 가에는 의문이 가는 것도 부 인할 수 없는 사실이다. 이는, 여러 가지 해석이 있을 수 있겠으나 필자의 견해로는 다음의 4가 지에 주로 기인한다. 1) CAD/CAM시스템 자체의 기능 및 성능 부족 2) 이기종 시스템간의 인터페이스 기술의 부족 3) 산업현장의 설계표준, 정보관리체계 등의 기반환경 미비 4) 적용 대상에의 전용화(customizing)기술의 부족 이 글에서는 이러한 원인들의 부분적인 해결을 위해서 필자가 속해있는 회사에서 수행한 노력 들을 몇 가지 사례를 통하여 소개하고자 한다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.26 no.9
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• pp.1764-1771
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• 2002

The latch needle cam system of circular knitting machines is analysed using multibody dynamics. A formulation is made to obtain the vertical stiffness between the needle and the cam. By implementing this formulation into the data of the multibody dynamics program, the motion of the needle is described and the forces and impulses between the needle and the cam are obtained.

• Journal of Dental Rehabilitation and Applied Science
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• v.36 no.2
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• pp.128-137
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• 2020

Over the last 30 years, the use of chairside computer-aided design (CAD) and computer-aided manufacturing (CAM) systems has evolved and has become increasingly popular in dentistry. Although CAD/CAM restorations have been used in the anterior dentition, satisfying the esthetic requirements of clinicians and patients, where the restorations are limited to the chairside, remains a challenge. To reproduce multi-shades of CAD/CAM restorations in the clinic, a preliminary experiment to express several shades on A2 lithium disilicate (LS2) blocks using a staining kit was performed. After measurement of the CIE L^*a^*b^* value of specimens, it was compared with that of the commercial shade guide. This report presents two cases with individual customization of shade and surface characterization of the CAD/CAM restorations using predictable methods based on the preliminary experimental data. The anatomical shape of restoration was obtained from 'copy and paste technique' and 'mirror image acquisition technique'. All treatment procedures and fabrication of restorations performed in this report were executed in the clinic itself.

• Journal of ILASS-Korea
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• v.22 no.1
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• pp.22-28
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• 2017

In this study, the effects of intake valve closing timing by using Cam-in-Cam system on combustion and emission characteristics for diesel engine were investigated under GT-POWER simulation environment. As a result, it was found that volumetric efficiency and effective compression ratio were decreased as the intake valve closing(IVC) timing is retarded due to its backflow effect. Also, we found that in-cylinder pressure, heat release rate and NOx emission were decreased as IVC timing was retarded. These show that the LIVC(late intake valve closing) can be effective to control AFR and mixing rate in diffusion combustion of diesel engine.

• Journal of the Korean Society for Precision Engineering
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• v.10 no.1
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• pp.52-61
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• 1993

Developed in this research is a CAM system for 5-axis NC Machining of sculptured surfaces. We identify problems in generating 5-axis NC data and propose methods of overcoming them. Issues discussed in this paper are: kinematic modelling of NC machines; determination of cutter position (location and orientation); check of machine work-range; linear trajectory plann- ing ; calculation of feedrate number. The proposed system has been implemented in FORTRAN77 on the Personal IRIS EWS, and it also constitutes a module of the CAD/CAM system 'CASSET' developed in KIST CAD/CAM lab.

• The Journal of Korean Academy of Prosthodontics
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• v.56 no.3
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• pp.188-198
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• 2018

Purpose: Recently, according to the development of digital technology, computer aided design/computer aided manufacture (CAD/CAM) system is widely used for fabrication of various dental prostheses in the field of dentistry. This study aims to survey the present state and awareness of CAD/CAM system on domestic dental field, and to supply the advice for the application of the new system. Materials and methods: In this questionnaire survey was conducted for a total of 298 dentists, dental hygienist and dental technicians of the whole country including the dental hospital of Seoul National University for two months from November to December, 2016 through mail. Results: The most important purpose to consider when purchasing a dental CAD/CAM milling machine were the performance of the milling machine (64.43%) and the use of milling machine was the highest with 49.33% of manufacturing for dental prosthesis and customized implant abutment. In addition, more than 60% of respondents answered positively about the purchase of new milling machine if the CAD/CAM milling machine was improved to satisfactory performance. Conclusion: This survey results show that the improved CAD/CAM milling machine would be play an important role in the dental industry in preparation for digitization and the 4th industrial revolution.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.04a
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• pp.410-415
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• 1997

Recently, The manufacturing companies are introducing the CAD/CAM systems to solve problems for the lack of experts, the higher cost of manufacturing and the difficulties of process. Knowledge engineering approach makes it possible to change a know-how of experts to computerized information effectivly. The proposal of this paper is the development of an interactive knowledge-based CAM system to disign and manufacture the mold with non-expert engineers used easily. This system is composed of two functional parts. One is the geometric modeler that used the technique of a feature modeling. The other is the expert system module that composed inference engine and databas which contains characteristics of materials and cutting tools setc.

• Journal of the KSME
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• v.32 no.2
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• pp.134-145
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• 1992

CAD/CAM의 초보지식을 부분적이나마 간략히 소개해 보았다. CAD/CAM에서 기하형상기술이 차지하는 비중과 이 기술의 한계점을 논의해 보았고, 설계에서 필수인 설계 지식이 CAD시스템에 융합되기 어려움을 실제의 예를들어 소개해 보았다. 마지막으로 현재의 CAD시스템이 기계전체 차원에서의 설계 도구이기보다 부품설계 차원에서의 도구임을 알아보았다. 현재까지 CAD시스 템이 설계과정에서 별로 창의력이 요구되지 않는, 그렇지만 많은 시간이 소요되는 도면 작업을 간편화하게 한 것으로도 CAD가 설계자동화에 큰 몫을 담당해 왔다고 볼 수 있다. 앞으로 미래의 CAD 방향은 인간의 창의력을 도와주는 곳으로 나가야함을 자명한 사실이라 본다.

• 제어로봇시스템학회:학술대회논문집
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• 1990.10a
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• pp.175-180
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• 1990

Rotational-free-surface (RFS) is a special type of free surface whose two boundaries coincide. For NC machining of PFS, a rotational axis as well as three Cartesian axes are required. In this paper, we develop a four-axis CAM module consisting of: a) Geometric modeling of RFS, b) CL-data generation, and c) Graphic simulation of machining operation. To test the validity and effectiveness of the developed module, several test cuts are made with Bridgeport CNC milling machine and compared with the graphic simulation.