Appliance Design - February 2008 - (Page 47) JOINING with a pre-painted and embossed top sheet. Henrob engineered a special self-pierce rivet to meet the entire range. A non-standard countersunk head prevents damage to joints with very thin top sheets. Further engineering developed a special nose piece on the setting tool to prevent unnecessary marks on the external skin of the joint. The automated system can switch between two available setting pressures in order to select the appropriate pressure for each joint. The flexibility of this system allows a reduction in fastener part numbers while satisfying strength and appearance needs and accommodating all joint thickness requirements. Using only one rivet type also eliminates the possibility of rivets being loaded into the wrong tool. As these case histories show, SPR is a very flexible fastening system, in step with the trend towards more efficient material use and joint design. < For more information, enter . . . . . . . . . . . . . . . . . .3 07 Or email: sales@henrob .com a single rivet type is used in this application in several different joint thicknesses to simplify assembly. Tooling is engineered to prevent marking on the top sheet. for self-pierce riveting. For maximum performance, it is important to have the SPR rivets and dies engineered for a specific application. This up-front planning can result in a lowercost joint design, minimal part numbers, and a more efficient assembly system. For example, SPR simplified one refrigerator design because a single rivet style meets the needs of several different sizes and types of joints. The designers originally considered adhesives and clinching to join pre-painted steel to uncoated steel. This method was not pursued because variations in material thickness, due to product size, complicated the manufacturing process. The company now uses Henrob SPR, with a single rivet type installed with different dies to accommodate all joints, thin or thick. Rivet selection was based on testing the entire range of joints found in the application, ranging in size from 0.017 in./0.125 in. to 0.040 in./0.226 in. Each joint was steel MP Series, Programmable process temperature controls for paint curing. 50 Manufacturers – One Source Your Complete Source for Adhesive Products & Solutions Ask the Glue Doctor TM Online Chat Solutions Adhesives • Sealants • Coatings Encapsulants • Dispensing Equipment Adhesive Repackaging • Custom Formulation Engineered Solutions US • China • Mexico • Europe • Canada • Malaysia CV Series, Redundant combination controls for RV furnaces and water heaters. Our technological developments are not common knowledge but we know they’re appreciated. www.maxitrol.com 800-888-0698 www.ellsworth.com Shop • Tech Support • RFQ • MSDS/TDS search For more Information Enter 120 www.applianceDESIGN.com AD02084Max.indd 1 1/11/08 10:19:22 AM For more Information Enter 121 applianceDESIGN February 2008 47 http://www.ellsworth.com http://www.maxitrol.com http://www.ellsworth.com http://www.appliancedesign.com
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