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Labs(part I): CAD
ME 250: Design & Manufacturing I
School of Mechanical Engineering
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Outline
Laboratories Objectives CAD system Software introduction User Interface
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Laboratories Objectives
the use of CAD systems computer numerically controlled (CNC)
machines other aspects of manufacturing.
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CAD system
Course objectives: Providing user with a solid Unigraphics
foundation. To create and edit design using appropriate
modeling techniques_Piece part modeling. To assembly parametric models_Product part
modeling. To creating engineering drawings_3D model
map to 2D drawing.
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About Unigraphics
The leading software for Design-through-Manufacturing UG features UG modules
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Technology Evolution
78: Drawing Based (Digital Drawings) 88: Feature Based (Digital Models)
Solid, Features, Visualization 95: Process Based (Digital Processes)
Process Integration: Auto, Aero, Machinery, Mold 99: Knowledge Based (UG V16) (Digital
Knowledge) Process Wizards, Optimization, Rules Based
Modeling
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Technology Evolution
Today, Product Development Process Transfer: From Series Engineering to Enterprise_
Range Concurrent Collaboration (UG/in-KEY)
From Parametric Part Modeling to Parametric Product Modeling (UG/WAVE)
From 2D Drawing_based to 3D Solid model Centric (Master Model Approach)
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UG/Software Key Features
A team_oriented, Enterprise level integrated MCAD/CAE/CAM product design system.
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UG’ Software Characteristics
Integration Associatively Collaborative Advanced Flexibility
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Integration CAD(D)/CAE/CAM Work Flow
Integration _ A full integrated M CAD/CAM/CAE Solution , From Concept Design 、Detail Design 、 Engineering Analysis to Manufacturing;
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Associatively
Master Model Approach
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xxx_aaa_dwg.prt
xxx_aaa_mfe.prtxxx_assm.prt
xxx_aaa_fea.prt
Associativity _ All applications are associative by Master Model approach;
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Collaborative Concurrent Engineering
Concurrent Collaboration _Support concurrent
collaboration within the expand Enterprise scope through
using “Master Model”、 PDM (Teamcenter Engineering
/Teamcenter Enterprise) 、 PV 、 Internet technique;
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Advanced
Supports “System Engineering” and “Virtual and Visual Product Development” By WAVE Techniques and Predictive
Engineering. Knowledge Based Engineering (KBE)_
By Knowledge Drive Automatism. UG NX solves “How to Capture 、 Reuse the special knowledge stored in those peoples and processes”.
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Flexibility
Hybrid Modeling : Design intent determines modeling strategy.
Run on Multiple_hardware platform. (Unix, Windows)
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UG Modules
Modeling Shape Studio Drafting Manufacturing Assemblies Sheet Metal Routing Simulation
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Modeling
UG software is primarily a solid modeling system. This module can help a design engineer quickly perform conceptual design.
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Shape Studio
Lets you create a realistic image by shading it.
Unigraphics users often quick shade the part to be sure they are looking at it correctly.
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Drafting
lets you create drawings, views, geometry, dimensions, and drafting annotations necessary for the completion of a drawing.
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Manufacturing
allows you to interactively create NC machining programs, generate toolpaths, visualize material removal, and postprocess.
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Assemblies
Product model A team-oriented design system Assemblies directly reference
component master models. Parametric Assemblies by using
Mating condition.
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Simulation
perform finite element analysis on models, and create multiple "scenarios" to analyze the effects of various design modifications on the finite element model.
give you a basic understanding of the Scenario for Structures concept and functionality.
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User Interface
Main Menu Bar Standard Icon View Icon Dialog Cue line Status Line
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Modeling Work Procedure
Main Menu Bar(File Edit View Insert Format Tools Assemblies Information Analysis Preferences Window Help)
Creat/Analysis/Edit File/View Preferences/ Format Tools Insert Information/Analysis Edit
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Main Menu_File The name of the part is displayed in the title
bar of the graphics area.
If you are working with assemblies, you can display a part of an assemble file.
If you are working with assemblies, you can work on a part file of a assemble file for creating and editing operations.
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File_save or close
When the word "Modified" (in parentheses) appears in the title bar of the graphics window, you know that you have made changes to the part that have not yet been saved.
After a part is saved, the Status line will say "Part file saved", and the word "Modified" will be removed from the graphics area window title bar.
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Tools_Expression When an object is created in
Unigraphics, expressions (i.e., equations) are created by the system, describing information about the object's size, location, and other information.
You can also create expressions yourself, and then use the names of the expressions in place of actual values as you create geometry. Later, you can change the values of the expressions and the part will automatically update.
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Coordinate System A coordinate system determines location
and orientation in modeling space. All coordinate systems in Unigraphics are
right-hand rule coordinate systems.
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Coordinate System
The Absolute Coordinate System (ACS) is the coordinate system from which all objects are referenced.(fixed)
“Existing coordinate system" (CSYS) can be used to return to a specific location and orientation in modeling space.
The Work Coordinate System (WCS) is the one you will use for construction when you want to determine orientations and angles of features as you build your solid.
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Work Coordinate System The axes of the WCS are
denoted XC, YC, and ZC. WCS-Origin…Defines a new
WCS by redefining the origin of the current WCS.
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Work Coordinate System
WCS-Rotates…Describes the new WCS as a rotation of the current WCS about one of its axes.
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Work Coordinate System
WCS Display Toggles the display of the WCS ON and OFF.
WCS Save Creates a coordinate system at the current WCS origin and orientation.
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CSYS Constructor
The CSYS Constructor dialog gives you many different orientation methods. It appears when you choose WCS Orient or View Orient.
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Layer control
Layers help you organize and manage data within a file. Every object in the database is located on one of 256 individual layers.
Layers act as a filter to specify which objects are selectable, visible, or invisible. They can show different geometry in different views.
Format/Layer Settings
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Selecting Features
In Unigraphics, the word "feature" means associative object.
Features include such things as blocks, holes, slots, pockets, blends, chamfers, and so on.
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Selecting Features
If you select the prehighlighted object after the cursor tip is displayed, the QuickPick confirmation dialog is provided.
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Selection
You can select Body, Face, Curve , Silhouettes(轮廓线) , Edges(边缘) , Vertex(顶点) , etc.
The ways of Selection: Single Selection, Multiple Selection, Rectangle/Polygon Selection, Chaining Selection(链接选取) , Class Selection(种类选择) .
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The Standard Views
There are eight standard views available in every part
Top Bottom Front Back Right Left TFR-ISO (Top/Front/Right
Isometric) TFR-TRI (Top/Front/Right
Trimetric)
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The Standard Views
The options on the View pull-down menu let you manipulate views in various ways. But the Right_button pop-up menu has many of these same options and is often more convenient to use.