• Title/Summary/Keyword: CAD data

검색결과 1,375건 처리시간 0.043초

제조특징인식에 의한 CAD/CAPP 시스템 (CAD/CAPP System based on Manufacturing Feature Recognition)

  • 조규갑;김석재
    • 한국정밀공학회지
    • /
    • 제8권1호
    • /
    • pp.105-115
    • /
    • 1991
  • This paper describes an integrated CAD and CAPP system for prismatic parts of injection mold which generates a complete process plan automatically from CAD data of a part without human intervention. This system employs Auto CAD as a CAD model and GS-CAPP as an automatic process planning system for injection mold. The proposed CAD/CAPP system consists of three modules such as CAD data conversion module, manufacturing feature recognition module, and CAD/CAPP interface module. CAD data conversion module transforms design data of AutoCAD into three dimensional part data. Manufacturing feature recognition module extracts specific manufacturing features of a part using feature recognition rule base. Each feature can be recognized by combining geometry, position and size of the feature. CAD/CAPP interface module links manufacturing feature codes and other head data to automatic process planning system. The CAD/CAPP system can improve the efficiency of process planning activities and reduce the time required for process planning. This system can provide a basis for the development of part feature based design by analyzing manufacturing features.

  • PDF

3D CAD 데이터 기반의 효율적 철근 요소 생성 알고리즘 (An Efficient Algorithm for Rebar Element Generation Using 3D CAD Data)

  • 조경진;이지호
    • 한국전산구조공학회논문집
    • /
    • 제22권5호
    • /
    • pp.475-485
    • /
    • 2009
  • 본 논문에서는 철근콘크리트 구조물의 3차원 디지털기술 기반 설계에 필요한 CAD/CAE 데이터 연동을 위하여 3D CAD 데이터로부터 철근 요소를 생성하는 2단계 알고리즘을 제안하였다. 1단계 과정은 STEP 표준형식의 3D CAD 데이터를 분석하여 여러 형태의 철근 객체 정보를 추출하는 알고리즘이며, 2단계 과정은 추출된 객체 형식의 철근 정보로부터 유한요소해석에 필요한 1차원 철근요소를 생성하는 알고리즘이다. 개발된 알고리즘을 구현하여 프로그램을 작성하였으며, 이를 사용하여 실제 3D CAD 소프트웨어로부터 생성된 철근콘크리트 구조물 데이터를 유한요소해석 데이터로 성공적으로 변환하여 제안된 알고리즘이 유효함을 보였다.

웹기반 협업을 위한 치수검증이 가능한 경량캐드파일 설계 (Design of Lightweight CAD Files with Dimensional Verification Capability for Web-Based Collaboration)

  • 송인호;정성종
    • 대한기계학회논문집A
    • /
    • 제30권5호
    • /
    • pp.488-495
    • /
    • 2006
  • The demand for the use of 3D CAD data over the Internet environment has been increased. However, transmission of 3D CAD data has delayed the communication effectiveness because of the CAD data size. Lightweight CAD file design methodology is required for rapid transmission in the distributed environment. In this paper, to derive lightweight CAD files from commercial CAD systems, a file translation system producing a native file is constructed first by using the InterOp and API of the ACIS kernel. Using the B-rep model and mesh data extracted from the native file, the lightweight CAD file with topological information is constructed as a binary file. Since the lightweight CAD file retains topological information, it is applied to the dimensional verification, digital mock-ups and visualization of CAD files. Effectiveness of the proposed lightweight CAD file is confirmed through various case studies.

설계이력 정보를 이용한 CAD모델의 오류 수정 (Healing of CAD Model Errors Using Design History)

  • 양정삼;한순흥
    • 한국CDE학회논문집
    • /
    • 제10권4호
    • /
    • pp.262-273
    • /
    • 2005
  • For CAD data users, few things are as frustrating as receiving CAD data that is unusable due to poor data quality. Users waste time trying to get better data, fixing the data, or even rebuilding the data from scratch from paper drawings or other sources. Most related works and commercial tools handle the boundary representation (B-Rep) shape of CAD models. However, we propose a design history?based approach for healing CAD model errors. Because the design history, which covers the features, the history tree, the parameterization data and constraints, reflects the design intent, CAD model errors can be healed by an interdependency analysis of the feature commands or of the parametric data of each feature command, and by the reconstruction of these feature commands through the rule-based reasoning of an expert system. Unlike other B Rep correction methods, our method automatically heals parametric feature models without translating them to a B-Rep shape, and it also preserves engineering information.

특징형상 기반 기자재 3D CAD 조립체 데이터 간략화 시스템 개발 (Development of Feature-Based 3D CAD Assembly Data Simplification System for Equipment and Materials)

  • 김병철;권순조;박선아;문두환;한순흥
    • 대한기계학회논문집A
    • /
    • 제38권10호
    • /
    • pp.1075-1084
    • /
    • 2014
  • 플랜트 설계를 위해서는 기자재 카탈로그를 구축해야 한다. 기자재의 3 차원 CAD 모델은 목적에 따라 서로 다른 상세도를 가진다. 기자재 제작사는 높은 상세도를 갖는 CAD 데이터를 제공하는 반면에 플랜트 엔지니어링사는 낮은 상세도를 가지는 CAD 데이터가 필요하다. 이와 같은 문제를 해결하기 위해서 기자재 3D CAD 조립체 데이터를 자동으로 간략화하는 시스템을 개발하였다. 이 논문에서는 간략화 시스템의 구조, 상세 기능과 함께 카탈로그 생성을 위한 중립 데이터 형식을 제안한다. 그리고 프로토타입 시스템을 이용한 간략화 실험 결과를 설명한다.

이 기종 시스템간의 CAD 데이터 교환 (CAD Data Exchange among Different Commercial Packages)

  • 김태욱;황병억
    • 한국산업융합학회 논문집
    • /
    • 제7권4호
    • /
    • pp.377-382
    • /
    • 2004
  • This research was about implementing STEP for data exchange among different commercial package(CAD system). STEP was used to share CAD data as follows. ST-Developer implement Solid model was used with a physical file of STEP and represented in a CAD system. And then STEP conversion utility was used to make a neutrality format form in a component modeling. Analysis of Solid model was made possible for CAD system to read in and analyzed Solid model. This research are summarized as follows 1. A basis Model development used Visual C++ for a neutrality data of a programming interface general-use CAD system, and produced Box and Cylinder to a physical file, the result was implemented this in a programming interface to general-use CAD system, it is represented in CAD system as identical one modeling object. 2. STEP was used in different CAD system to utilize to its of each CAD system maximum, CATIA V5R9 user was able to analyze MDT 6 Modeling Arm. 3. STEP was used able to interpret and remodel the existing Solid model.

  • PDF

CAD 데이터의 무결성을 위한 데이터 매칭 자동화 시스템 (Automatic Data Matching System for CAD Data's Integrity)

  • 변해권;유우식
    • 산업공학
    • /
    • 제24권1호
    • /
    • pp.71-77
    • /
    • 2011
  • Design works consist of essential works and subsidiary works. Essential design works means designing creative ideas and productive ideas, while subsidiary design works means helping essential works those are making data tables and specification sheets, checking CAD data's integrity. Subsidiary design works forms the bulk of the whole design process and affects the time limit of delivery. Therefore we propose the automatic data matching system for CAD data's integrity. Proposed system is automatic system supporting subsidiary design works. The data matching system consists of three parts; 1) automatic generation of data tables 2) supporting module for checking CAD data's integrity between Drawings 3) automatic generation of spec. sheets. Developed system was tested in LCD equipment manufacture company and was found to be useful system.

MEMS 설계용 2차원 데이터의 중복요소 제거를 통한 3차원 CAD 모델로의 변환 (Data Translation from 2D MEMS Design Data by the Removal of Superposed Entity to the 3D CAD Model)

  • 김용식;김준환
    • 한국CDE학회논문집
    • /
    • 제11권6호
    • /
    • pp.447-454
    • /
    • 2006
  • Although there are many needs to use 3D models in MEMS field, it is not easy to generate 3D models based on MEMS CAD. This is because MEMS CAD is based on 2D and their popular format-GDSII file format- has its own limits and problems. The differences between GDSII file format and 3D CAD system, such as (1) superposed modeling, (2) duplicated entity, (3) restricted of entity type, give rise to several problems in data exchange. These limits and problems in GDSII file format have prevented 3D CAD system from generating 3D models from the MEMS CAD. To remove these limits and solve problems, it is important to extract the silhouette of data in the MEMS CAD. The proposed method has two main processes to extract silhouette; one is to extract the pseudo-silhouette from the original 2D MEMS data and the other is to remove useless objects to complete the silhouette. The paper reports on the experience gained in data exchange between 2D MEMS data and 3D models by the proposed method and a case study is presented, which employs the proposed method using MEMS CAD IntelliMask and Solidworks.

XML을 이용한 이기종 CAD 조립체 DMU시스템의 설계 (An XML-based Digital Mock-Up System for Heterogeneous Multi-CAD Assembly)

  • 송인호;정성종
    • 대한기계학회논문집A
    • /
    • 제31권6호
    • /
    • pp.635-643
    • /
    • 2007
  • As many engineers and technicians are involved in the design process of large scale and/or complex products, there are a lot of miss matches and interferences due to designers' faults and several kinds of CAD systems. Recently, CAD systems are applied to verify and check the assembly process. Digital Mock-Up(DMU) system, a tool to build a virtual mock-up in the design stage, has been used to prevent the interferences and miss matches during precision design processes. Using the virtual assembly tool, engineers are able to design precision and interference free parts without physical mock-ups. Instead of a single CAD source, several CAD systems are used to design a complex product. Several organizations are involved in the distributed design environment for heterogeneous multi-CAD assembly. XML and the lightweight CAD file are proposed for the multi-CAD assembly. XML data contains hierarchy of the heterogenenous multi-CAD assembly. STEP PDM schema and STEP ISO 10303-28 formations are applied to construct the XML data. The lightweight CAD file produced from various CAD files through ACIS kernel and InterOp not only contains mesn, B-Rep and topological data, but also is used to visualize CAD data and to verify dimensions. Developed system is executed on the desktop computers. It does not require commercial CAD systems to visualize 3D assembly data. Real-time interference and fitness checks, dimensional verification, and design and assembly verification are performed on the developed system. Assembly of heterogeneous models for a car is conducted to verify the effectiveness of the developed DMU system on the Internet.

3D Model Compression For Collaborative Design

  • Liu, Jun;Wang, Qifu;Huang, Zhengdong;Chen, Liping;Liu, Yunhua
    • International Journal of CAD/CAM
    • /
    • 제7권1호
    • /
    • pp.1-10
    • /
    • 2007
  • The compression of CAD models is a key technology for realizing Internet-based collaborative product development because big model sizes often prohibit us to achieve a rapid product information transmission. Although there exist some algorithms for compressing discrete CAD models, original precise CAD models are focused on in this paper. Here, the characteristics of hierarchical structures in CAD models and the distribution of their redundant data are exploited for developing a novel data encoding method. In the method, different encoding rules are applied to different types of data. Geometric data is a major concern for reducing model sizes. For geometric data, the control points of B-spline curves and surfaces are compressed with the second-order predictions in a local coordinate system. Based on analysis to the distortion induced by quantization, an efficient method for computation of the distortion is provided. The results indicate that the data size of CAD models can be decreased efficiently after compressed with the proposed method.