68 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. HOLE PREPARATION FOR BLIND RIVETING Here are work piece hole conditions that affect the performance of a blind rivet. Many times I am contacted by blind rivet users telling me that they are having problems with their blind rivets in their application. In many cases, it is not the blind rivet but instead it is the condition of the hole in the work pieces they are riveting. The following are some of the hole conditions that lead to blind rivet failure. Hole Burrs BURR BREAK AWAY UPSET SIDE FLANGE SIDE When the blind rivet is inserted into the hole of the work piece and set, the mandrel head upsets the barrel of the rivet body and forms the barrel upset against the burr. As the mandrel is being pulled to it’s maximum tensile strength, the burr cuts into the barrel upset. If the blind rivet body is aluminum and the work piece is steel, stainless steel the burr will cut away a portion of the barrel upset created by the mandrel head when setting the blind rivet. When a part of the barrel upset is cut away when setting the blind rivet, this greatly reduces the tensile strength of the set blind rivet. To achieve the tensile strength of the set blind rivet, there must be no burrs on the hole on the upset side and flange side of the work piece. The upset side will cut the blind rivet barrel upset and on the flange side will cut the flange of the CONTRIBUTOR ARTICLE blind rivet. This condition occurs when drilling with a dull drill and pushing the drill through the work piece, rather than having the drill cut the material. A sharp drill should always be used when drilling a hole for a blind rivet. A dull drill will cause a circular burr to be formed around the hole. This condition can be created in a work pieces made of any type of metal. A worn or dull hole punch will also leave a burr around the hole to be riveted. In most cases, the burr is on the upset side of the work piece because the drilling operation is usually performed from the operator side. Hole Diameter The diameter of the hole to be riveted is also important relative to the tensile strength and clamp load of a set blind rivet. All blind rivet manufacturers list the recommended minimum and maximum hole diameters for all sizes of blind rivets. The minimum is not the problem. If the hole diameter is too small the body of the blind rivet will not enter the hole. The oversized hole is the problem for more than one reason. When a blind rivet is set in an oversized hole, the mandrel head will pass through the barrel of the blind rivet body. The mandrel will continue down the rivet body until it reaches the flange of the blind rivet body. CONTINUED ON PAGE 142
THE DISTRIBUTOR’S LINK 69 Auto Bolt is pleased to annouce the arrival of their new Videx Thread Roller. This state-of-the-art thread roller has a dualspindle feature, which will allow them to roll both the threads and knurls on the many wheel bolts that they produce. The threads will be rolled in the first station whereas the knurls will be rolled in the second station on one continuous pass through the roll/knurl dies. Tooling can be changed quickly to ensure a high yield of quality parts at the end of each day. Auto Bolt continues to invest in their people and equipment to expand their offerings and competitive pricing, striving to remain a quality supplier to their customers. Auto Bolt is a proud American, privately owned, domestic Bolt manufacturer located in Cleveland, Ohio. Auto Bolt production sizes range from 5/16 “(M8) to 1-1/8” (M27). Our product line consists of Hex Flange Bolts, Hex Cap Screws, Shoulder and Place Bolts, Wheel Bolts, Carriage Bolts, Plow Bolts, 12-Point Bolts, Tank Bolts, Pins, Double End Collar Bolts, Spring Bolts and many Specials Per Print. We also offer secondary processes including Drilling and Grinding, Heat Treatment, Plating, Passivation, Patching and Sorting. Available carbon steel includes SAE 1008, 1010, 1018, 1038, 1541 and 10B21 plus alloy grades SAE 1335, 1541, 4037, 4140, 5140, 8620, 8637 and 8740. Additional Stainless- Steel options available. It’s a good time to be a domestic supplier and a great opportunity to partner with Auto Bolt! For additional information, please contact Auto Bolt at 1-216-881- 3913, email quotes@autoboltusa. com, or visit them online at www. autoboltusa.com.
In the Spring 2023 issue of 6 DISTR
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