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Distributor's Link Magazine Fall Issue 2017 / Vol 40 No4

64 THE DISTRIBUTOR’S

64 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. HOW TO DETECT A QUALITY BLIND RIVET The quality of a Blind Rivet can be detected by the following tell-tale signs. Mostly all blind rivet bodies that are produced today are cold formed. They are manufactured from wire. The rivet bodies are call EXTRUDED rivet bodies. The other method of producing rivet bodies is manufacturing them from sheet material. This method is called STAMPED rivet bodies. Stainless steel rivet bodies are mostly stamped because of the high tooling cost for extruded bodies and the short tooling life. you are setting the blind rivet. When setting the blind rivet, the mandrel head will be deflected from it’s centerline and will cause the upset side of the rivet to be forced to an off-center setting, which will effect the integrity of the set rivet. A good quality cold headed or extruded rivet body will have the rivet barrel square and 90 degrees to the centerline of the rivet body as shown below. One tell-tale sign of poorly extruded rivet body is that end of the rivet body’s barrel will not be square or 90 degrees to the centerline of the rivet body. This is caused by not feeding the extrusion tooling the correct amount of material. In this case, there is not enough material for the head forming die to produce a full length barrel. This condition has a serious negative effect when CONTRIBUTOR ARTICLE Another tell-tale to look at is the diameter and the roundness of the rivet body flange. A quality extruded rivet body should have a flange diameter within the tolerance of +/- .010 total indicator reading TIR. This condition is caused by not having enough material to fill the flange heading tool. Aside from having +/- .010 tolerance of the flange diameter, the outside diameter OD should be also concentric to the centerline of the rivet body within +/- .010 TIR. CONTINUED ON PAGE 160

THE DISTRIBUTOR’S LINK 65

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