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Distributor's Link Magazine Summer 2020 / Vol 43 No3

38 THE DISTRIBUTOR’S

38 THE DISTRIBUTOR’S LINK Anthony Di Maio Anthony E. Di Maio attended Wentworth Institute and Northeastern University. In 1962 he started working with Blind Fasteners as Vice-President of Engineering & Manufacturing for two blind rivet manufacturers. He has been Chairman of the Technical Committee of the Industrial Fasteners Institute (IFI) and is still involved in the writing of IFI specifications. In 1991, he started ADM Engineering and is working with Fastener Manufacturers developing new fasteners and special machinery. He can be reached at ADM Engineering, 6 Hermon Ave., Haverhill, MA 01832; phone and fax 978-521-0277; e-mail: tdimaio@verizon.net. DESIGN OF BLIND RIVETS Why do some blind rivets have “annular rings” on the mandrels? This question has been asked many times, I will try to answer it for you. The pictures below show a few of the blind rivets that have annular rings on the mandrel. PROPERLY SET RIVET STRUCTURAL SELF-PLUGGING PULL MANDREL The mandrel annular rings were introduced to blind rivets to prevent the pulling jaws of the blind rivet setting tool, from slipping when the setting tool is setting the blind rivet. CONTRIBUTOR ARTICLE The pulling jaw slipping occurs when the setting tool is setting high tensile strength mandrels. High tensile mandrels are used in stainless steel rivets, large diameter blind rivets 3/16 & 1/4 diameters and structural blind rivets. The stainless steel rivets, large diameter blind rivets and structural blind rivets require a high force to set and expand the blind rivet body. That is why high tensile strength mandrels are used to set these blind rivets. The stainless steel rivets, large diameter blind rivets and structural blind rivets require a high force to set and expand the blind rivet body. That is why high tensile strength mandrels are used to set these blind rivets. The higher the tensile strength of the mandrel, the harder it is for the pulling jaws grooves to grip and penetrate the mandrel when setting the blind rivet. If the grooves of the pulling jaws do not grip and penetrate the surface of the mandrel, the pulling jaws will slip on the surface of the mandrel when the blind rivet is set. If the pulling jaws have been used for a long period of time, the pulling jaw grooves will become worn and the pulling jaws will need to be replaced. When the pulling jaws slip on the PULLING JAW mandrel when setting a blind rivet, the setting tool will have a lose of pulling stroke and will not set the blind rivet in one stroke. It will take two or three strokes to set a single blind rivet. CONTINUED ON PAGE 116

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