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Distributor's Link Magazine Fall 2021 / Vol 44 No 4

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. SECONDARY MANUFACTURING OPERATIONS FOR BLIND RIVETS There are secondary manufacturing operations that must be performed to Structural blind rivets to make the Structural blind rivet perform correctly. Head Point MANDREL STRUCTURAL SELF-PLUGGING PULL MANDREL The Structural blind rivet has a long mandrel head. The mandrel head also has a sealing ring around it’s diameter. When setting the Structural blind rivet, such as Monobolt or Interlock, the long mandrel head will travel the complete length of the rivet body. There is a large degree of friction when the long mandrel head is being pulled the length of the rivet body. Because of this high degree of friction the assembled Structural blind rivet is submerged in a lubricant. This lubricant will dry to the touch but will lubricate the mandrel head and reduce the friction. Without this lubricant the friction of the mandrel head traveling the length of the rivet body is high enough that the mandrel could have a pre-mature mandrel break before the structural rivet is set. This prematured mandrel break will cause a mal-function and the Structural rivet will not clamp the work pieces together. Many steel mandrels of the Open-End series of blind rivets are also manufactured with a phosphate coated mandrels and these phosphate coating mandrels do not get zinc plated. This phosphate coating to applied CONTRIBUTOR ARTICLE to prevent rusting. This phosphate coating can be a secondary manufacturing operation at the plating department. Many blind rivet manufacturers purchase steel mandrel wire that is coated with phosphate. When the mandrel making machine produces the mandrels the phosphate becomes in contact with the tooling that forms the point and head of the mandrel and deposits phosphate on the point and head of the mandrels. This phosphate prevents the steel mandrel from rusting. Plating blind rivet mandrels:- The plating department first clean the mandrels in the baskets of their automatic plating production lines. The plating baskets are rotated and have many holes for the plating chemicals to contact the mandrels that are inside the plating baskets. The holes in the plating baskets must be smaller than the diameter of the mandrel. For example, the diameter of the steel mandrel of a 3/32 diameter blind rivet is .0565 +/-.001. The holes in the plating baskets must be less then .053 diameter so that the 3/32 diameter blind rivet mandrel that is .0565 +/-.001 will not enter the holes. If the hole diameter is larger the mandrels will enter the hole in the plating baskets and the mandrels will bend from the weigh of the load of steel mandrels in the turning plating baskets. CONTINUED ON PAGE 140

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