Computer-Aided Design / Computer-Aided Manufacturing MEE430,KIM,ME,NIU

Transcription

1 Computer-Aided Design / Computer-Aided Manufacturing

2 Computer-Aided Design and Computer-Aided Manufacturing and Applications with Pro/E, 4 th Edition, Meung J. Kim., 2013, LuLu Publishing Co. Reference Books CAD/CAM: Theory and Practice, Ibrahim Zeid, McGraw-Hill, Inc., 1991 Computer-Aided Manufacturing, T-C Chang, R. Wysk, and H-P Wang, Second Edition, Prentice Hall, 1991 Engineering Graphics, F. Giesecke, et al, Fifth Edition, Macmillan Pub. Co., 1993 Engineering Graphics, William Spence, Second Ed., Prentice Hall, 1988

3 Dr. Meung J. Kim, Professor of Mechanical Engineering Office Hours: MTW 3:00 4:00 pm Class Room: EB211 Contact: Tel: (815) , Fax: (815) , Teaching/Lab Assistants The teaching/lab assistants are available in cad/cam lab (EB 231) as posted on the lab door. The lab is available 9:00 am 6:00 pm on weekdays. See assistants for weekend availability. TBA

4 The primary goal of engineering transform ideas into products that are economical and reliable. The process of designing and introducing a part to manufacturing involves a sizable investment and draws on various disciplines and resources. Engineering is an important key to product design, product manufacturing flow, and the ability of a company to produce good products. Product design determines the function appearance cost of production the ability to plan and control manufacturing operations. It is known that about percent of the resources and cost required to produce a part are committed at its design phase. The further the part in its production, the more costly it is for any design change, as shown in Fig. Cost Design Cost of design changes Part-cost commitment Manufacturing

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6 Design CAD technology and tools Manufacturing numerically controlled (NC) and computer numerically controlled (CNC) machine tools. NC and CNC replace conventional machines, thus offering increased flexibility, superior accuracy, and shorter production cycles. The integration of CAD and CAM is an important aspect of factory automation.

7 CAD/CAM integration: based on development of NC technology which have been heavily influenced by development of NC part programming Interactive computer graphics Increasing emphasis on tools and paths for NC machines. Today s engineers must understand the influence of engineering design on the manufacturing process and overcome their isolation from the manufacturing process, and appreciate the subtleties facing CAD/CAM integration.

8 Design Phases 1. Definition and Planning (Gantt Chart) 2. Engineering Specifications (QFD > House of Quality) 3. Concept Generation (Brainstorming, Brain writing, etc.) 4. Concept Generation (Decision Matrix) 5. Product Design (Drawings, Bill of Materials, Analyses, PMI) Manufacturing Phases 1. Prototyping 2. Production 3. Product Evaluation (Quality, Cost, Time, etc.) CAD 1. Solid Modeling (Extrude, Revolve, Sweep, and Blend) 2. Assembly and Animation 3. Mechanism Analysis (Kinematics and Dynamics) 4. Numerical Analyses (Stresses, Flows, Heat, and Dynamics) 5. Engineering Drawings (Product Manufacturing Information) CAM 1. NC Technology 2. Rapid-prototyping (Layering) 3. Tool-Path Generation and Simulation (Collision and Gauging) 4. NC Post-processing (Standard NC Codes Machine Specific NC Codes) 5. Production with NC Machines

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10 A. Application of knowledge of mathematics, science and engineering B. Design and conduct experiments, as well as analyze and interpret data C. Design of a system, component or process to meet desired needs D. Ability to function on multi-disciplinary teams E. Identify, formulate, and solve engineering problems Assessment Measures F. Understanding of professional and ethical responsibility G. Communicate effectively H. Broad education necessary to understand the impact of engineering solutions in a global and societal context I. Recognition of the need for, and an ability to engage in life-long learning J. Knowledge of contemporary issues K. Use of techniques, skills, and modern engineering tools necessary for engineering practice

11 1. Review the process of engineering problem solving (Outcome A,C,E,G) 2. Review computer and graphics technologies (Outcome I,J,k) 3. Introduce methodology in design (Outcome A,C,E,K) 4. Learn the geometric description in CAD/CAM (Outcome A,K) 5. Learn the geometric modeling (Outcome A,J,K) 6. Briefly introduce FEA (Outcome A,C,E,J,K) 7. Learn about applications of CAD/CAM technology (Outcome G,I,K) 8. Learn about Computer-Aided Manufacturing with NC and CNC (Outcome C,G,I,K) 9. Learn geometric description by programming and NC part programming (APT) (Outcome C,G,K)

12 A,C,E,G,I,J,K

13 1. Differential equations 2. None 3. Numerical methods, strength of materials, dynamics, kinematics 4. Linear algebra, engineering graphics 5. Numerical methods, engineering graphics 6. Numerical methods, differential equations 7. Strength of materials, dynamics, kinematics 8. Manufacturing 9. Computer programming, engineering graphics

14 1. Ch1,2. Introduction to computers and CAD/CAM (3 hours) 2. Ch.3. Methodology in CAD/CAM (5 hours) 3. Ch.4. Geometric Description (6 hours) 4. Ch.5. Solid Modeling (5 hours) 5. Ch.6. Brief introduction to FEM (2 hour) 6. Mid-Term (1 hour) 7. Ch.7. Application of CAD/CAM Technology (1 hour) 8. Ch.8. CAM ( 5 hours) 9. Ch.9. Geometric Description by Programming (6 hours) 10. Ch.10. NC Part Programming (6 hours) 11. Final Exam. (2 hours) 12. Modeling with ProE (4 hours) and Part Manufacturing with CAM (3 hours) of Laser Cutting, Milling, Lathe machines Total (49 hours)

15 1. Solid Modeling lab projects. Students will learn the techniques of computer-aided solid modeling using a commercial CAD software (Pro/Engineer ). 2. Mechanism Design lab projects. Students will learn the computer-aided mechanism design and analysis using a commercial software (Working Model 2D, Pro/Motion ) 3. Finite Element Analysis and Optimization lab projects. Students will learn the computer-aided finite element analysis/design using a commercial software (Pro/Mechanica ) 4. Linear Programming Optimization lab project. Students will learn how to optimize a linear objective function subjected to inequality constraints using a commercial software (MathCad )

16 1. Solid Modeling. Students will complete 20 lab assignments designed to teach the basic techniques of computer-aided solid modeling, which includes extrusion, cut, revolve, sweep, and chamfer/round. 2. Engineering Drawings. Students will complete one lab assignment designed to teach them how to generate engineering drawings from the solid models they created using the solid modeling software. 3. Assembly. Students will have two lab assignments designed to teach them how to assemble the parts created. 4. Finite Element Analysis and Optimization. Students will have two lab assignments designed to give them how FEA works with CAD software, which includes meshing effect, design studies, and optimization. 5. Linear Programming Optimization. Students will have a lab assignment designed to teach optimization of a linear objective function subjected to inequality constraints. 6. Part Production by Milling. Students will have one lab to complete a part by Computer-Aided Milling machine. 7. Part Production by FDM. Students will have one lab to complete a part by Fusion Deposit Model rapid-prototyping machine. 8. Part Production by Laser. Students will have one lab to complete a part by CW80 Laser Cutting Machine.

17 Wk 1. Ch1,2. Introduction to computers and CAD Wk 2. Ch.3, Methodology in CAD/CAM Wk 3. Wk 4. Ch.4, Geometric Description Wk 5. Ch.5, Solid Modeling Wk 6. Ch.6, Brief introduction to FEM Wk 7. Wk 8. MID-TERM (TBA) Wk 9. Ch.7, Application of CAD/CAM Technology Wk 10. Wk 11. Ch.8, CAM Wk 12. Ch.9, Geometric Description by Programming Wk 13. NC Part Programming Wk 14. Wk 15. Other Issues in CAD/CAM Wk 16. Final Exam (As scheduled in NIU schedule book) Grading Policy 1. Homework: 30 % 2. Exams 70 % Grade Distribution A C B D

18 Office Hours: MTW 3:00-4:00 pm