• Journal of Technologic Dentistry
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• v.42 no.1
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• pp.45-53
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• 2020

Purpose: The purpose of this study was to investigate the current status and satisfaction of dental CAD/CAM system. Methods: A survey of dental technicians was conducted and a total of 353 responses were used for analysis. The satisfaction difference according to career was analyzed by ANOVA and tukey HSD (α = .05). Results: Satisfaction with the design program was 3.64 ± .86, the highest among all items. On the other hand, the satisfaction with price was 2.75 ± 1.02, which was the lowest. The difference according to career was statistically significant in the following items. Frequent breakdown, single crown margin, bridge crown margin, retentivity, price, A/S, equipment training (p<.05). Conclusion: As the materials applied to dental CAD/CAM are expanding and the types of prostheses are diversified, the use rate of CAD/CAM is continuously increasing. The dental CAD/CAM system will need to be improved in a way that will satisfy all patients, dentists and dental technicians.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.34 no.3
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• pp.361-367
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• 2010

The barrel cam, which is a type of cylindrical cam, has been widely used as a part of index drive units for automatic manufacturing machines. The axis of rotation of the barrel cam is orthogonal to the axis of rotation of the follower. The index drive rotates or dwells depending on the cam profile, while the cam rotates with a constant velocity. Continuous sliding contact between the barrel cam and the follower surfaces causes wearing of the adhesive between them. This study shows that the contact force between two sliding bodies is responsible for the wear of the barrel cam in the paper-cup-forming machine. This contact force is calculated by using the multibody dynamics model of the paper-cup-forming machine. The analytical result is validated by comparing it to the actual wear spots on the real product.

• Proceedings of the KSME Conference
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• 2001.11a
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• pp.584-589
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• 2001

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 data of the multibody dynamics program, the motion and the force between the needle and the cam are obtained.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1992.04a
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• pp.317-322
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• 1992

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

• Proceedings of the KAIS Fall Conference
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• 2006.05a
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• pp.192-195
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• 2006

본 논문에서는 다이 플레이트(Die Plate)를 제작할 때 생산성 향상을 위해서 3D CAD/CAM 시스템을 적용하였다. 사용된 3D CAD/CAM 소프트웨어는 UG NX 3.0이며 생성된 NC 코드는 CNC밀링 및 와이어 컷 방전가공기에 전송되어 다이 플레이트를 자동 가공한다.

• Korean Journal of Computational Design and Engineering
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• v.3 no.4
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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.

• Journal of the Korean Society of Safety
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• v.10 no.3
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• pp.42-46
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• 1995

To purpose of this study is to model design and motion analysis of tangential cam mechanism using personal computer system. The CAD(Computer Aided Design) system used in this study was constructed with CPU(Central Processing Unit) 80486, RAM(Random Access Memory) 8M, CGA graphic card. By using developed program for tangential cam mechanism, we designed tangential cam models and analysed displacement, velocity, acceleration of follower.

• Journal of the Korean Society for Precision Engineering
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• v.10 no.3
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• pp.21-24
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• 1993

인간을 학술용어로는 호모 사피엔스(Homo Sapiens:지성인) 또는 호모 파베르(Homo Faber:공작인)로 표현하는 것에서도 알 수 있듯이 우리 인간은 그 이유야 어쨌든 본질적으로 도구를 사용하고 물건을 만드는 능력을 가지고 있다. 그리고 물건만들기(생산) 기술은 수렵사회, 농경사회, 공업사회, 정보화사회로 사회가 바뀌는 동안 끈임없이 변화 발전해 왔다. 특히 40년대말 50년대 초에 걸쳐 개발된 컴퓨터, NC(수치제어)기 술과 70년대에 개발된 마이크로프로세서 기술은 그후의 생산기술을 획기적으로 변화시키고 말았다. 즉 설계, 가공, 조립, 검사, 보관 등 생산에 필요한 요소가능을 자동화시키고, 나아가 이들을 연결 통합하여 CAC/CAM, FMC, FMS와 같은 고도의 자동화 생산시스템이 가능하게 하였다. 그 결과 인간은 재이없고 지루한 단순 반복 작업에서 해방되어, 자동화 시스템을 프로그래밍 또는 관리. 통제하는 지적작업에 전념하게 되었고, 고품질에 싼 제품이 생산되게 되었다. 더나아서 최근에는 생산 시스템에 지능을 부여한 IMS(Intelligent Manufacturing System:지능형 생산 시스템)를 실현하고자 하는 국제 공동연구가 추진되기에 이르렀다. 이 글에서는 IMS의 모습을 잠시 살펴본 뒤 그 핵심기술의 하나인 지능형 CAM의 모습과 실현방법에 대해서 알아 보도록 한다.

• The Journal of the Korean dental association
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• v.50 no.3
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• pp.118-125
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• 2012

CAD/CAM systems (computer-aided design / computer-aided manufacturing) used for decades in restorative dentistry have its application to implant dentistry. This study aimed to overview CAD/CAM systems used implant dentistry, especially emphasizing custom implant abutments manufacturing. CAD/CAM custom abutments present the advantages of being specific to each patient and providing a better fit than the stock and cast custom abutments. This cutting edge technology of virtual-designed and computer-milled implant abutments will likely replace traditional implant restorative protocols and become the standard for implant dentistry in the foreseeable future.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.21 no.2
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• pp.283-289
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• 2012

Cam rack pinion (CRP) system which consists of cam rack and roller pinion transforms the rotation motion into linear one. The roller pinion has the plurality of rollers and meshes with its conjugated cam rack. The exact tooth profile of the cam rack and the non-undercut condition to satisfy the required performance have been proposed by introducing the profile shift coefficient. The load stress factors are investigated by varying the shape design parameters to predict the gear surface fatigue limit which is strongly related to the gear noise and vibration at the contact patch. The results show that the pitting life can be extended significantly by increasing the profile shift coefficient.