• Title/Summary/Keyword: Computer-aided manufacturing

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A Study on the 3D Modelling and Transference of Scaning Data using LSC Method (LSC를 이용한 스캔데이터 변환 및 3차원 모델 생성에 관한 연구)

  • 김민주;이승수;박정보;김순경;전언찬
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2001.04a
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    • pp.387-392
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    • 2001
  • This paper is to model a 30-shape product applying mathematically the data acquired from a 3D scanner and using an Automatic Design Program. The research studied in th reverse engineering up to now has been developed continuously and surprisingly. However, forming 3D-shape solid models in CAE and CAM, based on the research, the study leaves much to be desired. Especially, analyses and studies reverse-designing automatically using measured data after manufacturing. Consequently, we are going to acquire geometric data using an 3D scanner in this study with which we will open a new field of reverse engineering by a program which can design a 3D-shape solid model in a CAD-based program automatically.

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Development of CAPP(Computer Aided Process Planning) Expert System using manufacturing process DB (생산공정 DB를 이용한 CAPP 전문가시스템 개발)

  • Ban C.W.;Jang D.Y.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.623-624
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    • 2006
  • Over the past decade, changes in product development processes and increased consumer demands have dramatically influenced engineering working practices and targets. The information technology revolution has made its appearance concurrent to this relentless escalation in product engineering requirement. It has offered hopes for improved productivity despite these increasing demands. The wide availability of personal computing power, virtually inexhaustible sources of information and an abundance of computerized engineering tools have created great expectations. CAPP (Computer Aided Process Planning) Expert system and database were developed using VB.NET and Microsoft SQL 2000 Server.

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Real Time Scheduling for Computer-Aided Manufacturing ( CAM ) Systems with Instance-Based Rules (CAM에서의 사례의존규칙을 이용한 실시간 일정계획)

  • Rhee, Jong-Tae
    • Journal of Korean Institute of Industrial Engineers
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    • v.17 no.2
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    • pp.63-74
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    • 1991
  • An expert scheduling system on real time basis for computer-aided manufacturing systems has been developed. In developing expert scheduling system, the most time-consuming job is to obtain rules from expert schedulers. An efficient process of obtaining rules directly form the schedules produced by expert schedulers is proposed. By the process, a set of complete and minimal set of rules is obtained. During a real time scheduling, when given information on possible values of elements, the rules produce possible values of decision elements, where logical explanations of the result may be offered in terms of chaining rules. The learning and scheduling processes have been simulated with an automated manufacturing line engaged in the production of circuit boards.

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A Study on the Development of Automatic Drawing System for Pump (펌프의 자동설계 시스템 개발에 관한 연구)

  • Kim, Ill-Soo;Park, Chang-Eun;Jeong, Young-Jae;Song, Chang-Jae;Kim, Hak-Hyoung;Park, Ju-Seog
    • 유체기계공업학회:학술대회논문집
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    • 1999.12a
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    • pp.333-337
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    • 1999
  • The biggest challenge facing today manufacturing industry is better quality and high productivity. From an economic point of view, productivity is the most important parameter, as high productivity will reduce the cost. However, the customers of day are not only cost concerned, but also quality conscious. So high accuracy levels should also be achieved in the manufacturing process. This paper reports the development of a automatic design system based on AutoCAD program. 1'his work is composed of three section that are design of top down menu, impeller and casing for pump programed by AutoLISP language and runned Windows system. The developed system ultimately generates the design for a pump through AutoCAD program. In the design of the pump, it needs about 23 hours with an expert, but this system can be only 80 seconds without an expert.

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Chairside computer-aided design/computer-aided manufacturing (CAD/CAM)-based restoration of anterior teeth with customized shade and surface characterization: a report of 2 cases (CAD/CAM을 이용한 전치부 수복시 색조 및 표면 특성의 개별화를 시행한 증례)

  • Kim, Hyun-Jung;Jang, Ji-Hyun;Ryu, Gil-Joo;Choi, Kyoung-Kyu;Kim, Duck-Su
    • 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.

Full-mouth rehabilitation in an amelogenesis imperfecta patient with anterior open bite using CAD/CAM system (전치부 개방교합을 보이는 법랑질형성부전증 환자의 CAD/CAM system을 이용한 전악 수복 증례)

  • Lee, Sang-Hoon;Yi, Yang-Jin;Jo, Deuk-Won
    • The Journal of Korean Academy of Prosthodontics
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    • v.55 no.4
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    • pp.410-418
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    • 2017
  • Amelogenesis imperfecta characterized as abnormally formed enamel is caused by a defect of unique group of genes. Patients affected by this disease might have difficulties in social and psychological aspects due to non-esthetic teeth as well as functional problems caused by enamel detachment and tooth wear from their early ages. Adult patients with amelogenesis imperfecta can be treated with full-mouth restorations, which make functional and esthetic rehabilitations of severely worn tooth. However, the anterior open bite and lack of occlusal clearance for posterior teeth restorations due to compensatory extrusion are the intervening factors in the prosthetic treatment. Therefore, the determination of anterior tooth lengths, vertical dimension, and anterior guidance should be set carefully. Recently, computer-aided design and computer-aided manufacturing (CAD/CAM) techniques help systematic approaches and enable dentists to reduce time-consuming procedures in the diagnosis and treatment of full-mouth rehabilitation. This case report demonstrates the successful full mouth rehabilitation using a CAD/CAM system in a young adult patient with amelogenesis imperfecta and anterior open bite.

Fixed prosthesis restoration in edentulous patient fully implanted without considering definitive prosthesis: A case report (최종 보철물에 대한 고려 없이 전악 임플란트 식립된 환자의 고정성 보철 수복 증례)

  • Chun, Young-Hoon;Pae, Ahran;Kwon, Kung-Rock;Kim, Hyeong-Seob
    • The Journal of Korean Academy of Prosthodontics
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    • v.55 no.4
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    • pp.427-435
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    • 2017
  • The most important factor in the treatment of fully edentulous patients using implants is the shape of the definitive prosthesis. After the shape of the definitive prosthesis is determined, residual bone analysis and selection of the implant type, number and position should be followed. In this case, for restoration of an edentulous patient fully implanted (except the maxillary right lateral incisor) without considering definitive prosthesis, facial esthetics and possibility of fixed type prosthesis were evaluated using complete denture. It was determined that the fixed type prosthesis was possible. Implants that could not be used for the definitive prosthesis were excluded from the treatment plan and fixed type provisional restorations were fabricated. After four months of provisional restorations, the patient showed stable occlusion and esthetic satisfaction. Definitive prosthesis was made of zirconia using CAD/CAM (computer aided design and computer aided manufacturing). The results were satisfactory during the 3 months of follow-up period after termination of treatment.

Research on Engineering & Technology Education for Elementary School Student by using F1 in Schools Program (F1 in Schools 프로그램을 이용한 초등학생 대상 공학 기술 교육에 관한 연구)

  • Park, So-Ra;Nam, Hyun-Wook
    • Journal of Engineering Education Research
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    • v.11 no.1
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    • pp.85-100
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    • 2008
  • The purpose of this study is development of 'F1 in Schools Program' for elementary school student and validation of the program. Fifteen students were originally chosen from the W elementary school in Cheongju, Chungcheogbuk-Do. The children were tested on their understanding of science and 'F1 in Schools Program'. After developing the 'F1 in Schools Program', it was used in the classroom to evaluate applicability and to examine the responses from students, parents and schools. The program consists of 60 classes and the time of each class is 40 minutes. This study was conducted for 10 days from January 22nd, 2007 to February 2nd, 2007. CAD(Computer Aided Design), CFD(Computation Fluid Dynamics), CAM(Computer Aided manufacturing) and CNC Machine were used in this study and proved to be good materials for students in that they increased the students' participation and imagination. However, the children's cognitive and creative abilities as well as manuals written in English hampered the process. Most students, parents, schools seemed to be satisfied with use of the program. However, the schools showed that there was not enough understanding of the program as a whole. The processes with which students build and inspect using the $CO_2$Model Car not only improves the processing of the model but also enhanced the students scientific understanding related to the car speed.

Functional and esthetic improvement through reconstruction of anterior guidance using the modified Dahl principle and copy-milled technique of CAD/CAM system: A case report (적절한 전방 유도 재현을 위해 수정된 Dahl 원리 및 CAD/CAM 복제 기법을 이용하여 전치부의 기능 및 심미성을 개선한 보철 수복 증례)

  • Kim, Sung-Ho;Choi, Yu-Sung
    • The Journal of Korean Academy of Prosthodontics
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    • v.57 no.2
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    • pp.160-170
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    • 2019
  • The anterior guidance is one of the important factors in prosthodontic treatment of anterior teeth. The lingual surface shape of anterior restorations is so critical that small errors of treatment procedure can cause discomfort of the patient and disharmony of the dentition. If the anterior restorations are achieved harmonious anterior guidance through the fabrication and adjustment of provisional restorations, it is important to accurately reproduce the lingual surface shape of provisional restorations as the final prosthesis. In this case report, it was used the modified Dahl principle and copy-milled technique of computer-aided design/computer-aided manufacturing (CAD/CAM) system for systematic diagnosis and treatment. Therefore, we tried to reconstruct the restoration shape more precisely by setting the appropriate anterior guidance and superimposing the digital image of the abutment teeth and the provisional restorations. Thus, by promoting functional and esthetic recovery, this case report demonstrates satisfying results to both the patients and dentist.

Full mouth rehabilitation using 3D printed crowns and implant assisted removable partial denture for a crossed occlusion: a case report (3D 프린팅 금관과 임플란트 보조 국소의치를 이용한 엇갈린 교합의 전악 수복 증례)

  • Sung-Hoon Lee;Seong-Kyun Kim;Seong-Joo Heo;Jai-Young Koak;Ji-Man Park
    • The Journal of Korean Academy of Prosthodontics
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    • v.61 no.4
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    • pp.367-378
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    • 2023
  • With the recent development of computer-aided design-computer-aided manufacturing technology and 3D printing technology, and the introduction of various digital techniques, the accuracy and efficiency of top-down definitive prosthetic restoration are increasing. In this clinical case, stable occlusion support was obtained through the placement of a total of 9 maxillary and mandibular posterior implants in patient with anterior-posterior crossed occlusion. The edentulous area of the maxillary anterior teeth, which showed a tendency of high resorption of the residual alveolar bone, was restored with a Kennedy Class IV implant assisted removable partial denture to restore soft tissue esthetics. Computed tomography guided surgery was used to place implants in the planned position, double scan technique was used to reflect the stabilized occlusion in the interim restoration stage to the definitive prostheses, and metal 3D printing was used to manufacture the coping and framework. This clinical case reports that efficient and predictable top-down full mouth rehabilitation was achieved using various digital technologies and techniques.