L10 Slide 31 Autodesk Design for Disassembly and Recycling

L10 slide 31 autodesk design for disassembly and

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L10 Slide 31 Autodesk Design for Disassembly and Recycling
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L10 Slide 32 Snap-Fits May not withstand large forces Plastic may creep over time Clamping force may decrease Could be an issue for application where sealing must be maintained Automotive Oil Filter Snaps Cantilever Snap fit
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L10 Slide 33 Types of Snap-Fits Allows for a longer cantilever arm when space is constrained Allows for greater deflection without increasing the strain on the material Source: AlliedSignal Plastics, Snap-Fit Design Manuel Most widely used type of snap-fit
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L10 Slide 34 Designing a Cantilever Snap-Fit Equal thickness High strain Low strain 17% more material 46% higher strain Thinner cross section Thicker cross section Equal strain Source: Bayer MaterialScience, Snap-fit Joints for Plastics
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L10 Slide 35 Diminishing Cantilevers Source: Bayer MaterialScience, Snap-fit Joints for Plastics
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L10 Slide 36 Snap-Fit: Minimize Stress Concentrations Source: AlliedSignal Plastics, Snap-Fit Design Manuel Source: Bayer MaterialScience, Snap-fit Joints for Plastics
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L10 Slide 37 Source: AlliedSignal Plastics, Snap-Fit Design Manuel Snap-Fit: Design for Injection Molding
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L10 Slide 38 Threaded Fasteners Self Tapping Screw Self Drilling Screw Machine Screw Usually needs pilot hole or boss Leading thread taps hole into substrate Fast to assemble Usually a wide pitch (“coarse”) Joint is weakened each time it is removed and re-fastened Needs a tapped hole, threaded insert, or a nut Can be easily removed and re- fastened Often a narrower pitch than self- tapping screws Flute drills the screw’s pilot hole
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L10 Slide 39 Allows for re-fastening Resistant to pull-out and strip-out Helps retain torque Negative: challenge for recycling Threaded Inserts
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L10 Slide 40 Alternatives Bosscrew ®, ITW Shakeproof Self tapping screw designed to retain torque in plastic without a metal insert Plastite ® 45° thread angle “bites” into more material than standard 60° angle Trilobular cross section allows plastic to fill in the spaces between lobes
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L10 Slide 41 Rivets : contamination marks Hot riveting : preferable to nailing, little force required for separation Pressurizing systems : can pose serious problems for disassembly; separable with physical force Welding : separable with physical force Solvent welding (of polymers): preferable to adhesive bonding Adhesive bonding : induces contaminants and waste Engaging Permanent Joints that Can Be Easily Opened (9.2.3)
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L10 Slide 42 Engaging Permanent Joints that Can Be Easily Opened (9.2.3) Avoid rivets in incompatible materials Avoid staples in incompatible materials Avoid additional materials while welding Weld with compatible materials Prefer ultrasonic and vibration welding with polymers Avoid gluing with adhesives Employ easily removable adhesives
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L10 Slide 43 Toyota Examples
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L10 Slide 44 Toyota Examples
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March 29 & April 1, 2019 L10 Part 3: System Approach DfES, Chapter 10
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  • Fall '09
  • MURRAYTHOMSON

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