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Distributor's Link Magazine Winter 2019 / Vol 42 No1


40 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: THREE DIFFERENT BLIND RIVET BODY DESIGNS Stamped Process Stamped blind rivet bodies are produced from sheet material. The sheet material is fed to a progressive stamping die having many punches and die stations. The different punches progressively form the barrel and flange of the rivet body. This manufacturing process offers high production rates but with a high percentage of scrap material. This rivet body stamping process was the major method to produce blind rivet bodies. Still today, the stamped rivet body process is used by many blind rivet manufactures to produce stainless steel blind rivets. Extruded Process Extruded blind rivet bodies are produced from wire. The wire is fed to a cold heading machine having up to 5 or 6 dies and punches. The part is transferred to each die and is progressively formed. This extruded process has a lower production rate but offers a very low scrap output. Tubing Process Long blind rivet bodies are produced from tubing. Both the stamped and extruded manufacturing process cannot produce a long rivet body. The stamping process has a limit as to how long the process can stretch the sheet material and the extruded process cannot CONTRIBUTOR ARTICLE also form the long barrel of the rivet body. The tubing process solves these two problems that the stamping and extruded process has. Again, this tubing process s only used for blind rivet bodies that are longer than 1 1/2 inches. Visible Appearance of Stamped And Extruded Blind Rivet Bodies There are obvious visible differences that many times raises the question “Are these blind rivets the same?” The end of the barrel opposite the flange of the extruded rivet body is flat and has no radius at the outside diameter. The top of the stamped rivet body has a radius that starts at the outside diameter of the barrel and ends at the inside diameter. CONTINUED ON PAGE 118


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