Appliance Design - February 2008 - (Page 46) JOINING SPr joint in 300 series stainless-steel corner seam on a refrigerator door. SPR is also used in models with laminated doors. To employ SPR, two conditions are required: 1. Access to both sides of application (no true blind applications). Tools can be configured with deep throat depths to accommodate wide applications. 2. A minimum surface area for the die that helps set the rivet (3 mm rivets need 12 mm of flat surface area; 5mm rivets need 16 mm). Joint design considerations for self-pierce riveting include the following: Preferably, brittle material should not be used for the bottom sheet. Examples of brittle material include 7000 Series aluminum, martensitic steels, polycarbonate polymer, and cast iron. If possible, the bottom sheet should be ductile with an elongation factor above 12 percent. Fastening through the thin or soft material(s) into the thick or hard material is preferred. However, as a rule of thumb, if the joint must be riveted through the thick material into the thin, this can be achieved with standard rivets if the bottom sheet is approximately 1/3 of the total stack thickness. Current technology allows joining up to 12 mm total thickness in aluminum and 6 mm in steel. There are no consensus industry standards February 24 –28, 2008 GLOBAL EVENT Austin Convention Center Austin, Texas 2008 THE PREMIER IN POWER ELECTRONICS Visit the Apec 2008 web site for the latest information! TM TM www.apec-conf.org SPONSORED BY For more Information Enter 119 AD12074Apec.indd 1 46 applianceDESIGN February 2008 11/14/07 10:13:33 AM www.applianceDESIGN.com http://www.apec-conf.org http://www.apec-conf.org http://www.appliancedesign.com
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