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Note for Computer Aided Design and Manufacturing - CADM By Er.Ramji Tripathi

  • Computer Aided Design and Manufacturing - CADM
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  • Mechanical Engineering
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UNIT 1 The first thing to know about all three of these systems is the first two letters in each abbreviation. “CA” stands to Computer-Aided, which means that all three systems are created to help the user to achieve his goal faster by using the power of computers for processing. The last letter for CAD, is Design, for CAE, is Engineering, and for CAM, is Manufacturing. These are engineering and manufacturing software programs. Each one is has its own purpose. The article will dive into a high-level look at all three systems and how they are used and their overall purpose.

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Computer-Aided Design ● A CAD program is a computer technology that designs a product and documents the design phase of the engineering process. ● CAD may facilitate the manufacturing process by transferring detailed diagrams of product’s materials, processes, tolerances, and dimensions. ● It can be used to produce either 2D or 3D diagrams, which can then be rotated to be viewed from any angle, even from the inside looking out. ● Computer-Aided Design is the use of computer systems to assist in the creation, modification, and optimization of design. ● This is often considered an engineering software program. Modern CAD Programs can improve the following: 1. 2. 3. 4. Increase the Productivity of the Engineer Improve the Quality of Design Improve Communications through Documentation Create a Database for Manufacturing CAD output is often in the form of electronic files for print, machining, or other manufacturing operations. Modern CAD programs for mechanical design uses either vector-based graphics for objects, or may produce raster graphics showing the overall appearance of design objects. However, engineering software programs require more than just shapes. As in the manual drafting or technical and engineering drawings, the output of CAD programs must convey information, such as materials, processes, dimensions, and tolerances, according to application-specific conventions. CAD is important industrial art extensively used in many applications, including automotive, shipbuilding, and aerospace industries, architecture, prosthetics, and much more. Modern CAD Programs Uses integrated modules or stand-alone products such as: 1. Computer-Aided Engineering (CAE) 2. Computer-Aided Manufacturing (CAM) 3. Photo Realistic Rendering

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4. Document Management and Revision Control using Product Data Management (PDM) CAD has been proven to be useful to engineers as well, using four properties which are: 1. 2. 3. 4. History Features Parameterization High Level Constraints Who Uses Computer-Aided Design Here is a short list of some people who would most likely use CAD in the job. ● ● ● ● ● ● ● ● ● ● ● Architectures Civil Engineers Electrical Engineers Facilities Manager Interior Designers Mechanical Engineers Structural Engineers Manufacturing Engineers Acoustics Engineers Fire Protection Engineers Food Services Designers Computer-Aided Design is used in many industries from aerospace, automotive, textiles, electronics, and much more. Computer-Aided Engineering Is the broad usage of computer software to aid in engineering analysis tasks. Engineering software programs includes ● Finite element analysis (FEA), ● Computational fluid dynamics (CFD), ● Multibody dynamics (MDB), and optimization. CAE tools are being used, for example, ● to analyze the robustness ● performance of components ● assemblies. The term encompasses simulation, validation, and optimization of products and manufacturing tools.

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In the future, CAE systems will be major providers of information to help support design teams in decision making. In regard to information networks, CAE systems are individually considered a single node on a total information network and each node may interact with another node on the network. The following parameters are typically used in mechanical engineering for CAE simulations: 1. 2. 3. 4. Temperature Pressure Component Interactions Applied Forces CAE systems can provide support to businesses. This is achieved by the use of reference architectures and their ability to place information views on the business process. Reference architecture is the basis from information model, especially product and manufacturing models. CAE areas covered included: 1. 2. 3. 4. 5. 6. 7. 8. Stress Analysis on Component Assembly using FEA Thermal and Fluid Flow Analysis using CFD Multibody Dynamics (MBD) and Kinematics Analysis Tools for Process Simulation for Manufacturing Processes Optimization of process documentation Optimization of product developing Smart nonconformity verification Safety Analysis of Assemblies In general, there are three phases in any computer-aided engineering tasks: 1. Pre-processing: defining the model and environmental factors to be applied. 2. Analysis Solver 3. Post-processing of results Engineering software programs include such as Abaqus, Ansys, MSC Adams Car, and much more. Modern CAD programs export models to engineering software programs for virtual prototype analysis. Computer-Aided Manufacturing Computer-aided manufacturing is the use of computer software to control machine tools and related machinery in the manufacturing process. It is not technically considered a system for engineering software programs, but rather for machinist on the fabrication side.

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