Dr. Aylin Gurkok - Florida International University - College of Engineering - Department of Mechanical and Materials Engineering - Miami

Transcription

1 What is CADD? Computer-aided drawing is a technique where engineering drawings are produced with the assistance of a computer and, as with manual drawing, is only the graphical means of representing a design. Computer-aided design, however, is a technique where the attributes of the computer and those of the designer are blended together into a problem-solving team.

2 Two-dimensional (2D) computer drawing is the representation of an object in the single-view format which shows two of the three object dimensions or the mutiview format where each view reveals two dimensions.

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5 Three-dimensional (3D) computer drawing is the coordinate format. Three dimensional computer aided drawing allows the production of geometric models of a component or product for spatial and visual analysis.

6 Milling Jig

7 A few examples from engineering disciplines will demonstrate the versatility of modern CAD systems. Aerospace: Layout drawings, part drawings, subassemblies, assemblies Chemical: Process schematics, process plant layout drawings Civil, Construction: Structural detail drawings, site plan drawings, construction drawings, road - use plans Electrical, Computer: Circuit board design, very large system integration (VLSI) design Industrial and Manufacturing: Manufacturing plant layout drawings, subassemblies, assemblies

8 The advantages of using CADD systems are listed as follow: constant quality drawing creation of database creation of library use of layers saving on repetition greater accuracy multicolour drawings editing functions

9 History and Background 1963 Sketchpad in MIT The first computer aided drawing system was introduced by IBM

10 History and Background 2 In modern systems the light pen has been replaced by more effective pointing hardware, that is a digitizer tablet, a mouse

11 CAD system and Hardware (a) the mainframe computer (b) the minicomputer (c) the microcomputer Input Devices The input devices are used for making selections from a menu, which is a layout of a variety of commands and functions required to operate the system. Sending these commands into the computer produces complete engineering drawings.

12 CAD system and Hardware 2 Output Devices The output devices receive data from the computer and provide an output, hard copy. (a) impact printers (dot matrix) (b) non-impact printers include electrostatic, ink-jet and laser (c) 3D printers (d) flatbed plotters (e) drum plotters

13 The User Interface CAD systems may be considered as comprising a large number of functions for creating or manipulating the design model. Traditionally, there are two ways in which this is achieved: Command-based systems Command-based systems operate by reading a command and its parameters entered by the user, carrying out the required actions, then waiting for the next command. command (optional parameters, target object)

14 The User Interface 2 Menu-driven systems The menu-driven approach contrasts markedly with the command approach. The basic principle is that the user is at any time presented with a list or menu of the functions that are available to be selected. The most important of these rules are: A clear, well presented screen layout. Easy function selection by a well-structured menu system. Meaningful function names. Meaningful and helpful prompts to the user. Easily accessible and clearly written help information.

15 CADD FUNCTIONALITY The main benefits of a computerized draughting and design system over those of manual methods is this ability to represent the design of a component or assembly in a geometrically accurate format so that the same model can be used for other modelling, analysis and manufacturing work. The functions can be said to fall into three categories: Synthesis type functions are concerned mainly with the creation of geometric features and drawing details Modification functions include those which allow for the deletion and editing of existing geometry or detail. Management functions are concerned with how the drawing is presented both on the screen and eventually on paper.

16 CADD SYSTEM SELECTION There is a large variety of different CADD packages available on the market these days and the design manager is faced with the enormous problem of selecting a package to suit the demands of the company and its product range. A lot of ease and efficiency has been obtained with the use of CADD systems. Among the more widely used CAD systems are AutoCAD, CATIA, SolidWorks, I-DEAS, and ProEngineer. Most of these packages have both a 2D and 3D component or have an integrated 2D and 3D modeling system. The newer versions of drawing software operate under a menu system which can be accessed through keyboard input or mouse manipulation.

17 CADD SYSTEM SELECTION 2 According to these factors, the system must have; Functional abilities: the abilities to perform memory circuits. Memory capacity : evaluation between main and branch memory circuits. Data transfer characteristics : when we consider data transfer between two computers, or a main computer and a station, we have to keep in mind the need to decrease computing time

18 CADD SYSTEM SELECTION 3 The size of the company and the amount of investment capital available will be one of the main deciding factors but there are many other questions to be considered: Mainframe or PC/workstation platform? Two dimensions or three? Lines, surfaces or solids? Other analysis tools needed? Will the ability to transfer the geometry to these modelling and analysis systems be needed? Compatibility with other systems needed? How good is the maintenance and support from the suppliers? How much, how good and how long is the training? How easy is it to expand the system?

19 AutoCAD - AutoCAD 2012, 2011, March 22 AutoCAD is PCbased CAD software products (late 1982). System Requirements for AutoCAD Windows NT or Windows 95/98/2000/ 2013 Pentium processor or compatible 32 MB of RAM 50 MB of hard disk space 64MB of disk swap space 2.5 MB of free disk space during installation only CD-ROM drive 640 x 480 VGA video display (1024 x 768 recommended) Windows-supported display adapter Mouse or other pointing device

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21 MECHANICAL DESKTOP Mechanical Desktop offers greater ease of use, flexibility and speed, 2D drawing capabilities for mechanical design, and greatly expanded 3D goemetric coverage. Mechanical Desktop is an integrated package of advanced 3D modeling tools, and 3D drafting and drawing capabilities that help you conceptualize, design, and document your mechanical product.

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23 Part / Assembly Environment Assembly Mode Scene Mode Drawing Mode

24 PRO/ENGINEER Creo Elements/Pro, a product formerly known as Pro/ENGINEER is a parametric, integrated 3D CAD/CAM/CAE solution created by Parametric Technology Corporation (PTC). The Pro/ENGINEER name was changed to Creo Elements/Pro on October 28, 2010, coinciding with PTC s announcement of Creo, a new design software solution Pro/ENGINEER or Pro/E, is a three-dimensional (3D), feature-based, solids modeling system. It was developed by Parametric Technologies Corporation (PTC) in the late 1980s. Features are three-dimensional (3D) geometries that have direct analogies to shapes that can be machined or manufactured, such as holes or rounds. Feature-based solids modeling creates and modifies geometric shapes that make up an object in a way that readily represents common manufacturing processes.

25 Message area Menu bar Tool bar Graphic window Help area

26 SOLID WORKS SolidWorks is a 3D mechanical CAD (computer-aided design) program that runs on Microsoft Windows and is being developed by Dassault Systèmes SolidWorks Corp., a subsidiary of Dassault Systèmes, S. A. (Vélizy, France). SolidWorks is currently used by over 1.3 million engineers and designers at more than 130,000 companies worldwide. SolidWorks is mechanical design automation software that takes advantage of the familiar Microsoft WindowsTM graphical user interface. This easy-to-learn tool makes it possible for mechanical designers to quickly sketch out ideas, experiment with features and dimensions, and produce models and detailed drawings.

27 History SolidWorks was founded in December 1993 by Jon Hirschtick with headquarters in Concord, Massachusetts, USA, who recruited a team of engineers to build a company that developed 3D CAD software that was easy-to-use, affordable and available on the desktop, with its headquarters at Concord, Massachusetts, and released its first product, SolidWorks 95, in In 1997 Dassault Systèmes, best known for its CATIA CAD software, acquired the company and currently owns 100% of its shares. SolidWorks was headed by John McEleney from 2001 to July 2007 and Jeff Ray from 2007 to January The current CEO is Bertrand Sicot.

28 Release history Name/Version Version History Value Release Date SolidWorks SolidWorks SolidWorks SolidWorks 97Plus SolidWorks SolidWorks 98Plus SolidWorks SolidWorks SolidWorks SolidWorks 2001Plus SolidWorks SolidWorks SolidWorks Solid Works SolidWorks SolidWorks July 1, 2007 SolidWorks January 28, 2008 SolidWorks December 9, 2009 SolidWorks June 17, 2010 SolidWorks September, 2011 SolidWorks September, 2012 SolidWorks October 7, 2013

29 File format SolidWorks files use the Microsoft Structured Storage file format. This means that there are various files embedded within each SLDDRW (drawing files), SLDPRT (part files), SLDASM (assembly files) file, including preview bitmaps and metadata subfiles. Various third-party tools (see Structured storage) can be used to extract these sub-files, although the subfiles in many cases use proprietary binary file formats. Solidworks 2010 SP3.1 opens/saves following file formats: SolidWorks Files (*.sldprt, *.sldasm, *.slddrw), Part Files (*.prt, *.sldprt), Assembly Files (*.asm, *.sldasm), Drawing Files (*.drw, *.slddrw), DXF (*.dxf), DWG (*.dwg), IGES (*.igs, *.iges), ProEngineer Part (*.prt, *.prt.*, *.xpr), ProEngineer Assembly (*.asm, *.asm.*, *.xas),ugii (*.prt), Autodesk Inventor Part (*.ipt), Autodesk Assembly (*.iam),

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32 I-DEAS (INTEGRATED DESIGN ENGINEERING ANALYSIS SOFTWARE) I-DEAS (Integrated Design Engineering Analysis Software) is a computer aided design (CAD), manufacturing (CAM), and engineering (CAE) package. I-DEAS is a complete Mechanical Computer Aided Engineering System for the engineering department. It provides full function design, analysis, drafting, testing, and NC programming in support of mechanical design automation. This software was designed to facilitate a collaborative concurrent engineering approach to mechanical engineering product design and analysis.

33 I-DEAS The package is separated into five distinct families, which are selected from the first menu option entering I-DEAS. I-DEAS Solid Modelling (Geomod) I-DEAS Drafting (Geodraw) I-DEAS Engineering Analysis (Supertab) contains finite element modelling for finite element solvers such as ANSYS or ABAQUES. I-DEAS System Dynamic (Systan) is used to design complex mechanical system. I-DEAS Test Data Analysis (TDAS) offers tools for general and specific data analysis, project management, and data acquisition

34 I-DEAS Design Application Modeler Task Drafting Simulation Manufacturing Test

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36 Web Pages for CAD softwares Autodesk home page Pro-Engineer CAD Software I-DEAS CAD software home page SolidWorks CAD software home page CATIA CAD software home page CADKEY software