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ME 521 Computer Aided Design. 2. Computer Aided Design and Production Process. Dr. Ahmet Zafer Şenalp e-mail: [email protected] Makine Mühendisliği Bölümü Gebze Yüksek Teknoloji Enstitüsü. Design and Production Process. 2. Computer Aided Design and Production Process.

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2. Computer Aided Design and Production Process

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ME 521

ComputerAidedDesign

2. ComputerAidedDesignandProductionProcess

Dr. Ahmet Zafer Şenalpe-mail: [email protected]

Makine Mühendisliği Bölümü

Gebze Yüksek Teknoloji Enstitüsü


DesignandProductionProcess

2. ComputerAidedDesign

andProductionProcess

GYTE-Makine Mühendisliği


IntegratingTheDesignandManufacturingProcessThrough a CommonDatase-A Scenario

2. ComputerAidedDesign

andProductionProcess

Example: Audiosystemcabinetdesign

  • Goals:

  • Betterquality

  • Lowercost

  • Quickdelivery

  • Designdescription: 4 spacesareneeded in thecabinet

  • CD player

  • 2. Cassette player

  • 3. Reciever

  • 4. Storagecompartment of CD’s

GYTE-Makine Mühendisliği


IntegratingTheDesignandManufacturingProcessThrough a CommonDatase-A Scenario

2. ComputerAidedDesign

andProductionProcess

  • PreliminaryDesign:

  • The designer can draw a lot of design concepts.

  • During this phase, according to the need can make 2 or 3 dimensional models

  • Photorealistic images of preliminarydesigns can becreated.

  • Preliminarydesignssubmittedtoacceptance:

  • The design concept is sent to the market via e-mailto measure the response

  • Selection of the model thatshould be designedandfeasibilitystudy:

  • Most admired model that collects the most sales potential will be theselected model.

  • Whenthedesignconcept is completed, data is storedtothedatabase:

  • furniturefiction: Theamount of shelf, theinformationsuchwheretousewhichshelfarecategorisedandsavedtodatabaseand in need can be recalledfromthedatabaseandchangedaccordingly.

GYTE-Makine Mühendisliği


IntegratingTheDesignandManufacturingProcessThrough a CommonDatase-A Scenario

2. ComputerAidedDesign

andProductionProcess

  • Determining the dimensions of the cabinet:

  • Its overall size should be determined so that each space within it can accommodate various models of the audio components on the market. Thus it is necessary to obtain information on the sizes of the audio components available. This information may be obtained from catalogs or retrieved from manufacturers' or distributors' databases.

  • Determining the material to be used for the cabinet:

  • The designer could specify natural oak, natural pine, particle board, steel sheet, or some other material.

  • However, in the case of products that operate under severe conditions, such as mechanical assemblies, the designer must be guided by the material's properties. The database is useful in this phase also because properties of many materials can be stored in it for later retrieval and use.

GYTE-Makine Mühendisliği


IntegratingTheDesignandManufacturingProcessThrough a CommonDatase-A Scenario

2. ComputerAidedDesign

andProductionProcess

  • determiningthe thickness of each shelf and door and the side walls:

  • The thickness of the shelves must be sufficient to avoid deflection caused by the weight of the audio components. However, in mechanical assemblies requiring high accuracy or a structure supporting heavy loads, dimensions such as thickness must be determined to avoid excessive deformation. The finite-element method is generally used to calculate the deformation of a structure.

  • By evaluating the deflection of the shelves while varying the thickness of the shelves, the designer can determine the proper thickness of the shelves and store that information in the database.

  • Inadditionacousticanalysismay be necessary.

  • Assemblytechnique:

  • Assemblytechnique is determinedby an expertsystem.

GYTE-Makine Mühendisliği


IntegratingTheDesignandManufacturingProcessThrough a CommonDatase-A Scenario

2. ComputerAidedDesign

andProductionProcess

  • Cabinetdetails:

  • When the design conceptualization, analysis, and optimization phases have been completed, the designer moves on to design documentation to specify the details of the cabinet.

  • The part drawings of the shelves, doors, and side walls are generated by using computer-aideddrafting. In this phase, the designer can add more details for aesthetic purposes.

GYTE-Makine Mühendisliği


IntegratingTheDesignandManufacturingProcessThrough a CommonDatase-A Scenario

2. ComputerAidedDesign

andProductionProcess

To make the cabinet, each part shape is arranged on the raw material, in this case sheets of wood, and cut out with a saw.

Waste can be reduced by arranging the parts efficiently on the wood sheets. The designer can try various parts layouts on the com­puter screen until obtaining a layout with minimum waste. The computer program can facilitate this process by calculating the amount of waste for each layout. Also a nesting program that automatically provides the most economic layout can be used.

Furthermore, software tools may be used to design the jigs and fixtures for this cutting process and to pro­gram the materials handling systems. These systems may be conveyor belts or robots that transfer the raw material and the cut parts to and from the saw.

GYTE-Makine Mühendisliği


IntegratingTheDesignandManufacturingProcessThrough a CommonDatase-A Scenario

2. ComputerAidedDesign

andProductionProcess

Once prepared, the parts have to be assembled. Ideally, the assembly process can also be carried out by robots that are programmed automatically from the descriptions of the final product and its parts that are stored in the database.

The jigs and fixtures for the assembly process can also be designed simultaneously.

In addition, a robot can be programmed to paint the cabinet after it has been assembled.

This scenario is summarized in figuregiven in nextpage. It shows how the CAD, CAM, and CAE activities are integrated through the database, which is the objective of CIM.

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CAD, CAM and CAE IntegrationThroughtheDatabase

2. ComputerAidedDesign

andProductionProcess

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Part Model

2. ComputerAidedDesign

andProductionProcess

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Finite Element Mesh

2. ComputerAidedDesign

andProductionProcess

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ApplyingBoundaryConditions

2. ComputerAidedDesign

andProductionProcess

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Results:Displacement

2. ComputerAidedDesign

andProductionProcess

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Results:EquivalentStress

2. ComputerAidedDesign

andProductionProcess

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PressureVesselAnalysis

2. ComputerAidedDesign

andProductionProcess

Geometric model

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PressureVesselAnalysis

2. ComputerAidedDesign

andProductionProcess

Finite element model

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PressureVesselAnalysis

2. ComputerAidedDesign

andProductionProcess

Boundary conditions

GYTE-Makine Mühendisliği


PressureVesselAnalysis

2. ComputerAidedDesign

andProductionProcess

Equivalent stress distributions

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ExamplePartSolid Model

2. ComputerAidedDesign

andProductionProcess

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Finite Element Analysis

2. ComputerAidedDesign

andProductionProcess

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FlowAnalysis

2. ComputerAidedDesign

andProductionProcess

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DieDesign

2. ComputerAidedDesign

andProductionProcess

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CNC CutterLocations

2. ComputerAidedDesign

andProductionProcess

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