Tech 149: Unit 3

Computer-Aided Engineering and Other CIM Subsystems

Computer-Aided Engineering• Process planning tasks• CNC programming tasks• Tool/fixture design• Time standards tasks• Plant layout & design• Analysis for manufacturability and

assembly• Manufacturing cost estimation

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Sales and Marketing Sub-Systems

• Customer support and identification

• Data collection and analysis

• Forecasting tasks

• Master production schedule (MPS)

• Promotional and advertising tasks

• Purchasing

• Shipping and receiving CIMDATABASE

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Material Handling Systems (MHS)

• Conveyor systems

• Robotics systems

• Automated guided vehicle (AGV)

• Automated storage and retrieval system (ASRS)

• Automated shuttle and pallet systems

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Inspection and Measurement Systems

• CMM inspection system

• Automatic scanners

• Computerized gages

• Others (electronic calipers etc.)

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Material Processing Systems• Welding robots

• Painting robots

• CNC milling machines

• CNC turning machines

• Automated shearing machines

• Automated punching machines

• Programmable logic controllers

• Others

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Chapter 5: Design Automation: Computer-Aided Engineering

• Computer-aided engineering (CAE) is the analysis of the engineering design using computer-based techniques to calculate product operational, functional, and manufacturing parameters too complex for classical methods.

• CAE also provides productivity tools to aid production engineering area by providing software to support group technology (GT), computer-aided process planning (CAPP), and computer-aided manufacturing (CAM).

Design for Manufacture and Assembly (DFMA)

• DFMA is any procedure or design process that considers the production factors from the beginning of the product design.

• Originated from producibility engineering, design for manufacture (DFM) and design for assembly (DFA).

Computer-aided Engineering Analysis

       Finite-element analysis (most frequently used)

       Mass property analysis

Computer-aided Engineering Evaluation

        PrototypingRapid prototyping techniques:

1) Stereolithography2) Solid ground curing3) Selective laser sintering4) Three-dimensional printing5) Fused-deposition modeling6) Laminated object manufacturing

Group Technology (GT)

   GT is a manufacturing philosophy that justifies small and medium-sized batch production by capitalizing on design and/or manufacturing similarities among component parts.

Group Technology

Prismatic and round parts

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Group Technology (GT)

Coding and classification:1)Coding is a systematic process of establishing an alphanumeric value for parts based on selected part features.2)Classification is the grouping of parts based on code values3)Coding and classification in GT are highly interactive because the coding system must be designed to produce classified groups with the correct combination of common features.

Group Technology (GT)

In GT production cells, groups of different machines are identified based on their ability to produce families of parts.

Group Technology (GT)

Reasons for adopting GT• Benefits of GT

– Benefits in product design

– Standardization of tooling and setup

– More efficient material handling

– Increased economies of batch-type production

– Easier scheduling

– Reduced work-in-process and lead time

– Faster and more rational process planning

Computer-aided Process Planning (CAPP)

• Consistent and correct process planning requires both knowledge of the manufacturing processes and experience.

• Two automation techniques are called variant and generative process planning.

Computer-aided Process Planning (CAPP)

  The CAPP variant approach uses a library of manually prepared process plans in the database and a retrieval system to match components on new parts to existing process pans of similar components.

  The CAPP generative approach utilizes a process information knowledge base that includes the decision logic used by expert human planners.

Computer-aided Manufacturing (CAM)

  CAM is the effective use of computer technology in the planning, management, and control of production for the enterprise.

  One of the major applications of CAM is in CAD/CAM where the part geometry created with CAD in the design engineering is used with CAM software to create machine code (NC/CNC) capable of machining the part.

  Production and process modeling  Production and process simulation  Production cost analysis

Design and Production Engineering Network Demands

  A common database for enterprise information flow

  Easy, accurate and instantaneous movement of part geometry files and product data between departments

  An enterprise network is a communications system that supports communications and the exchange of information and data among various devices connected to the network over distances from several feet to thousands of miles

Automated Process Control Systems• Temperature control

• Pressure control

• Time control

• Weight control

• Hardness control

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