Lecture 5 ENGR3030U Lee Chapter 12

Lecture 5 ENGR3030U Lee Chapter 12 - Rapid Prototyping and...

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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Objectives: Specific Rapid Prototyping and Manufacturing processes. RP&M applications. Stereolithography processes. Software technology used in RP&M. Rapid Prototyping and Manufacturing – Ch. 12
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Overview Began in 1970s, to create physical objects directly from geometric data without traditional tools. Rapid Prototyping – also known as layered manufacturing , 3D printing , desktop manufacturing , and solid freeform manufacturing . Now encompasses applications beyond prototyping (to include manufacturing ).
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Overview Three steps: 1) Form cross sections of object to be manufactured 2) Lay cross sections layer by layer 3) Combine layers Only cross-sectional data required to generate physical object.
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Specific RP&M Processes Table 12.1 Features of RP&M Machines
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Table 12.1 Features of RP&M Machines Specific RP&M Processes
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. First system developed by Ultra Violet Products, Inc. (UVP), with C. Hull founding 3D Systems, Inc. to produce Stereo Lithography Apparatus. Specific RP&M Processes – Stereo Lithography
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Stereo lithography (a) process and (b) 3D Systems’ Viper Pro SLA system (based on Fig. 12.1). Specific RP&M Processes – Stereo Lithography
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Step 1 – photosensitive polymer maintained in liquid phase. Step 2 – elevating platform located one layer of thickness below top surface of liquid polymer. Step 3 – UV laser scans polymer layer above platform, solidifies polymer, and gives it required cross-sectional shape. Step 4 – platform lowered onto polymer bath to layer thickness. Liquid polymer flows over part to start next layer. Step 5 – repeat Step 3 and 4 until top layer of part generated. Step 6 – post-curing performed to solidify part completely, where some liquid regions may have remained in each layer. Specific RP&M Processes – Stereo Lithography
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Disadvantage – requires support structure when part has undercuts (upper cross section has larger area than lower one). Figure 12.2 Support structures in stereo lithography process. Specific RP&M Processes – Stereo Lithography
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Figure 12.3 Impeller made by the stereo lithography process. Specific RP&M Processes – Stereo Lithography
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Each layer cured by exposure to lamp instead of laser beam scanning. Layers cured simultaneously – no need for post-curing.
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