78 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. THE ADVANTAGES OF BLIND RIVETS The Blind Rivet is the only fastener that has its assembly setting compression force built into its design and construction and that is the tensile strength or break load of the mandrel. The mandrel has a pre-determined break point located below the head of the mandrel. This break point is a reduction of the mandrel diameter, thus reducing the mandrel’s tensile strength at this break point. When the blind rivet setting tool exerts a pulling force on the mandrel greater than the tensile or break load of the mandrel, the mandrel will break at the break point. This pulling force that broke the mandrel is the clamping force of the blind rivet. Blind rivet manufacturers who are producing blind rivets to the Industrial Fasteners Institute (IFI) specifications (IFI- 114) have a minimum and maximum range for mandrel break load. Example 1/8 diameter blind rivet (4 series) grade designation No. 30 (steel rivet body & steel mandrel) break load is 600 lbs. to 800 lbs.. This ensures the user that this steel 1/8 diameter blind rivet will set between 600 lbs. to 800 lbs. pull pressure of the blind rivet setting tool. Shear and tensile of the set blind rivets is also listed in IFI-114 specification. Using the steel blind rivet in the example above, the minimum shear strength is 260 lbs. and the minimum tensile strength is 310 lbs.. The project engineers and designers know the minimum shear and tensile values of the blind rivet and can determine how many f these blind rivets to use for a secure joint in the product assembly. Knowing in advance the minimum shear and tensile values of the blind rivet, the engineers and designers are positive that they will have integrity in their blind riveted joint. Because the mandrel breaks at a pre-determined tensile or break load exerted by the setting tool, the operator CONTRIBUTOR ARTICLE needs to only squeeze the trigger of a power setting tool to set the blind rivet. The operator cannot change when the mandrel will break, or change the shear and tensile values of the set blind rivet. Not like a screw, where a much less or variable torque results are achieved. If the threaded fastener is under torque or over torque, we do not have a joint with the integrity of a blind rivet assembly. A blind rivet, in essence, is a one-piece fastener when used by an operator. There are no nuts or washers needed to form an assembled joint. There fore inventory is less because a blind rivet is a one-piece fastener. Because a blind rivet can function within a range of work thicknesses only one fastener is needed for the assembly and once again, reduces inventory. Because blind riveting is performed in one single stroke process, the blind rivet setting tool can be brought to the assembly, rather than the assembly being brought to the setting tool as it is when setting solid rivets. Blind rivet setting tools can be adapted to fit in small areas and also fitted for right angle applications. The installation cost is less with blind rivets than screws, nut etc. because of the quick setting time of a blind rivet. A blind rivet power setting tool has a stroke distance long enough to set a blind rivet in one stroke at minimum work thickness. There are automatic feed systems that can set 50 blind rivets per minute. These systems have been mounted to the arm of robots and have reduced labor cost of riveting large complex assemblies. A blind rivet can fasten joints of dissimilar materials such as metal to plastic, wood to plastic, glass to metal etc. In special soft material applications the blind rivet manufacturer will alter the tensile strength of the mandrel and use a large flange blind rivet body to distribute the clamping force over a larger area. I have used this theory blind riveting leather to aluminum. CONTINUED ON PAGE 188
CSM FASTENER PRODUCTS 2451 Estes Ave, Elk Grove Village, IL 60007 TEL 630-350-8282 FAX 630-350-8499 EMAIL sales@csmfastener.com WEB www.csmfastener.com CSM - PROUD TO SAY THEY ARE TRULY “MADE IN THE USA” CSM Fastener Products is a family owned company that has been serving its customers for over 25 years. Located just outside of Chicago and minutes from O’Hare International airport, CSM is widely known for its Consistent Quality, Personalized Service, On-time Delivery and Dependability. At CSM Fastener Products they are proud to carry on the fine tradition of American Manufacturing. CSM’s #1 priority is quality, with experienced inspectors and stateof-art laboratory ensuring your parts are manufactured to your specifications. CSM can supply certification documentation for your order, including Level 3 PPAP’s. CSM is also ISO 9001-2008 certified. Need fast turnaround? CSM’s in-house Tooling Department will have your order running in production quickly, often the same day! CSM takes great pride in handling every order with a “sense of urgency!” CSM’s top-notch Engineering Department has the experience and knowledge to solve any technical challenge, assisting in the design of custom-made THE DISTRIBUTOR’S LINK 79 fasteners for nearly any application and will recommend the most cost efficient fastener to meets your specifications. CSM is a leading domestic source for Specials - starting at #3 thru 1/2” (M3-M12) and with capabilities to produce lengths up to 7” under the head. CSM manufactures from carbon and alloy steel, stainless steel (410, 430, and 302HQ), aluminum, brass, silicon bronze, and copper, and specializing in parts that require DFAR and domestically made material. CSM Fastener Products’ plant has over 80 pieces of equipment to service your needs; with multi-blow headers for those parts with larger head and shoulder requirements, and dedicated trimming machines that can make parts with hardto-find head styles. The slotting machines provide head, shank, and end slotting, and the high-speed Sems machines keep your costs and lead times at a minimum. By utilizing three in-house Multi Camera Vision Sorting machines they can insure you receive the highest quality products available, all Made in the USA. BUSINESS FOCUS ARTICLE CSM FASTENER PRODUCTS
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