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Transcript of Presentation on CAD/CAM Lab of VI Sem Syllabus
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CAD/CAM Lab
1/30/2013 Dr. Bhimsen Soragaon, IEM, JSSATE, B'lore-60
For VI Sem. IE & M
W. E. F 2012-13
(10IML67)
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Agenda..• Course details• Syllabus • List of exercises to be conducted• Suggested software tools / Scheme of exam.• CAD / CAE / CAM• Solid Modeling Exercises• FEA Exercises• Machining Exercises• Model Viva-voce questions1/30/2013 Dr. Bhimsen Soragaon, IEM, JSSATE, B'lore-60 3
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1/30/2013 Dr. Bhimsen Soragaon, IEM, JSSATE, B'lore-60
COURSE DETAILS
SUB CODE 10IPL /IML 67 IA MARKS 25
No. of Lecture (Lab) Hrs./ Week
03 Exam Hours 03
Total No. of Lab Hrs. : 42 Exam Marks 50
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1/30/2013 Dr. Bhimsen Soragaon, IEM, JSSATE, B'lore-60
PART – AModelling of simple machine parts using Graphics Package. Studyof Finite Element Analysis Package - 1D, 2D, Structural problems;Evaluation of displacement (Strain) and Stress. Problems involvingBeams and Trusses.
PART – BModeling and Simulation of Machining process of simple machineparts using standard CAM packages.
Syllabus
Note: A minimum of 12 exercises are to be completed
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Table of ContentsSl / Expt. / Exercise No. Date Title of the Expt. / Exercise Remarks
Part - A
1 Solid Modelling Exercise No.1
2 Solid Modelling Exercise No.2
3 Solid Modelling Exercise No.3
4 Solid Modelling Exercise No.4
5 Finite Element Analysis Exercise No. 1
6 Finite Element Analysis Exercise No. 2
7 Finite Element Analysis Exercise No. 3
8 Finite Element Analysis Exercise No. 4
9 Finite Element Analysis Exercise No. 5
Part - B
10 Simulation of Turning operations Exercise – 1
11 Simulation of Turning operations Exercise – 2
12 Simulation of Turning operations Exercise – 3
13 Simulation of Milling operations Exercise – 1
14 Simulation of Milling operations Exercise – 2
15 Simulation of Milling operations Exercise – 3
16 Model viva-voce questions
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Suggested Software Packages
Solid Works / Uni Graphics / Catia / Solid Edge / MASTER CAM or any other similar packages
ANSYS for FEA
Scheme of External Examination
ONE question from part - A 20 Marks ONE question from part - B 20 MarksViva -Voice: 10 MarksTotal: 50 Marks
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Scheme of Internal Examination
Conduction of the experiment / model preparation / Simulation (including record book)= 15 marks
Test = 10 marks
Total = 25 marks
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Design-Manufacturing Process(before computer era)
Sketch with pencils
Engineering Drawing with pencils
Manufacturing
An Idea..
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An Idea conceived …
Hydraulic Machine ….ByLeonardo-da-vinci
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Engineering Drawing-Assembly
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Manufacturing
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Now…. with computer
CAD (Solid Modeling)
Engineering Drawing
Manufacturing
CAA (Computer Aided Analysis)
CAM (Computer Aided
Manufacturing) /Direct
Manufacturing
http://en.wikipedia.org/wiki/Computer-aided_design
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Computer-Aided Design
• Computer-aided design (CAD) is the use ofcomputer systems to assist in the creation,modification, analysis, or optimization of adesign. (Groover, M. P.)
• CAD is essentially based on a versatile andpowerful technique called computer graphics.(Involving creation and manipulation ofpictures on a display device with the aid of acomputer).
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The conventional design & CAD process
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Area of focus – PART A
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Geometric Modeling• Computer compatible mathematical description
of the geometry of an object.• The image of the object can be displayed &
manipulated on a graphics terminal throughsignals from the CPU of the CAD system.
• When a command is given, the computerconverts it into a mathematical model, stores itin the computer data files, and display it as animage on the display device.
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• A geometric model may be 2D, 2.5D, 3D and..• A geometric model may be a wire frame
model, a surface model or a solid model.• Wireframe models are represented by lines
(straight or curved).• Surface models help visualizing complex
surfaces such as automated NC pathgeneration. Material volume information isambiguous or hard to determine.
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Geometric Modeling
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3D Wireframe Models
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3D Surface Models
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3D Solid Models
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3D Solid Models
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Creating Solid Model• Primitive creation• Boolean operations• Sweep operations• Surface operations• Engineering Feature-Based modeling• Parametric modeling
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Prerequisites:• Engineering drawing / Machine drawing concepts• Basic computer operation knowledge.
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Commercial CAD/CAE Tools
• AutoCAD• Solid edge• Solid works• CATIA (Computer Aided Three-dimensional
Interactive Application)• Unigraphics – NX series• ANSYS• NISA• Nastran
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Modeling Software Used• Solid Edge V19 or V20
– Runs on Microsoft windows and provides solid part modelling, assembly modelling, and drafting functionality.
– Originally developed and released by Intelligraph in 1996.
– Purchased and developed further by UGS in 1998.– Presently, owned and modified by Siemens PLM
Software, AG.– Present version is Solid Edge ST5.
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Engineering Analysis
• Mass property analysis.– A feature of CAD system which provides
properties of solid object being analysed, such asthe surface area, weight, volume, centre of gravityand moment of inertia.
• Finite element analysis.– The object under analysis is divided into large
number of finite elements which form aninterconnecting network of nodes.
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Finite Element Analysis• The basic unknowns in an engineering problem may
be:– Displacements & stresses in solid mechanics,– Velocities in fluid mechanics,– Electric and magnetic potentials in electrical engineering,– Temperatures in heat flow problems,– ……………
• The finite element procedure reduces such unknownsto a finite number by dividing the solution region into alarge number of small parts called elements,connected by nodes or nodal points.
• Solution for unknowns is sought for these nodalpoints, based on the element properties.
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FEA Software Used• ANSYS, Inc. is a US based company that has
developed this computer-aided engineering (CAE) application package.
• A comprehensive general-purpose finite element computer program that contains over 100,000 lines of code.
• Capable of solving, numerically, a wide variety of mechanical problems - static/dynamic, structural analysis (both linear and nonlinear), heat transfer, fluid problems, as well as acoustic and electromagnetic problems.
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Some Analysis Models
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Some Analysis Models
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Some Analysis Models
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General Procedure Used
• Preprocessing: (defining the problem)– Build model, define material properties, define
element and its properties, discretization.
• Processing or solution– Apply boundary conditions
• Postprocessing– Interpretation of results (texts, numbers, graphs,
pictures
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Computer Aided Manufacturing• Since the age of the Industrial Revolution, the
manufacturing process has undergone manydramatic changes.
• The most important of these changes is theintroduction of Computer AidedManufacturing (CAM), a system of usingcomputer technology to assist themanufacturing process (plan, manage, andcontrol the operations of productionequipment).
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Commercial CAM Packages
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Product Company
VoluMill Celeritive
CimatronE Cimatron
Mastercam CNC Software/Mastercam
CATIA Dassault Systemes
PowerMILL, FeatureCAM Delcam
ESPRIT DP Technology
CAMWorks Geometric Technologies, Inc.
e-NC ERCII
GibbsCAM Gibbs and Associates
Machinist Kubotek Corporation
Edgecam, Alphacam Planit
SolidCAM SolidCAM
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Software Tool Used
• CAPSturn and CAPSmill Software Tools,developed by CADEM Technologies Pvt. Ltd. forCNC lathe and milling machines respectively.
• Possess in-built CAD to define the part shape,tools and cutting parameters database,extensive set of machining operations, tool pathsimulation, and generic post-processor.
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General Working Procedure
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A CNC Machining Center
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Solid Modeling ExerciseGenerate the solid model of the following machine part, given its orthographic views, Using solid edge / solidworks / unigraphics / catia software tool.
Software used: Solid Edge V19 / V20
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Solid Modeling ExerciseGenerate the solid model of the following machine part, given its orthographic views, Using solid edge / solidworks / unigraphics / catia software tool.
Software used: Solid Edge V19 / V20
Procedure: 1. Open Solid Edge – Solid Part package. 2. In the graphics window, select an appropriate plane. 3. Draw the relevant 2-D view in that plane and use
Protrusion / Cut Protrusion / Hole / other editing commands. 4. Specify appropriate dimensions and generate the solid part. 5. Use other planes if necessary and repeat step 3 and 4 to
complete the model.
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Solid Edge Initial Screen
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Solid Edge Part Modeling Initial Screen
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Solid Edge Part Modeling – Sketch Mode
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Solid Edge Part Model
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FEA Exercise
Prerequisites:
1. Mechanics of Materials
2. Concepts of Finite Element Method
3. Exposure to a modeling package
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FEA ExercisePerform a finite-element (FE) analysis on a cantilever beam shown infigure below and calculate the deflection of the beam at the loadingpoint and the stress distribution in the beam.
Data given:Geometry: length l =90 mm; Material: mild steel having Young’s modulus E=210 GPa and Poisson’s ratio ν=0.3. Boundary conditions: The beam isclamped to a rigid wall at the left end and loaded at x =80mm by a pointload of P =100 N.
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FEA ExerciseObservations: Software used: ANSYS V13Element used - Quad 8 node 82 (PLANE82)
Procedure:1. Open ANSYS. In the window that is displayed, select ‘Structural’ preferences.
Change the ‘file name’ if required. 2. Define the material properties and element properties. 3. Build the geometric model of the part by using suitable geometric elements.4. Convert the model into FE model by meshing the geometric model.
(Steps 3 & 4 can be grouped into one by using ‘nodes’ and ‘elements’ while building the model).
5. Apply boundary conditions (constrain left end of FE model appropriately and apply the load on the node as shown in the figure).
6. Solve the problem by choosing ‘solution’ option. 7. Interpret the results and record.
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ANSYS Initial Screen
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(1) Utility Menu: The Utility Menu contains functions that are availablethroughout the ANSYS session, such as file controls, selections, graphiccontrols, and parameters.(2) Input Line: The Input Line shows program prompt messages andallows to type in commands directly.(3) Toolbar: The Toolbar contains push buttons that execute commonlyused ANSYS commands. More push buttons can be made available ifdesired.(4) Main Menu: The Main Menu contains the primary ANSYS functions,organized by pre-processor, solution, general postprocessor, and designoptimizer. It is from this menu that the vast majority of modellingcommands are issued.(5) Graphics Windows: The Graphics Window is where graphics areshown and graphical picking can be made. It is here where the model inits various stages of construction and the ensuing results from theanalysis can be viewed.
Sections in ANSYS Main Window
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Select the ‘structural’ preference
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Define material properties
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Define element & its attributes
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Define element & its attributes
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Build the model
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Discretizing the model
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Discretized the model – nodes displayed
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Constraints and Loading
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Solution
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Postprocessing - Deflection
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Postprocessing - Deflection
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Postprocessing – Stresses (Bending)
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Postprocessing – Reaction forces
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Machining Exercise - Prerequisites
• Machine tool details• Cutting tool details• Process planning• Work piece material• Cutting parameters• Part programming basics
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Machining Exercise – Initial screenThe image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the file again. If the red x still appears, you may have to delete the image and then insert it again.
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Machining Exercise – Part & Blank defined
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Machining Exercise - Part & Blank defined
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Machining Exercise – Tool path simulation
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Machining Exercise – NC Code generation
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Machining Exercise – NC Code generation
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Machining Exercise – Cycle time data
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