Testing should be done in the design phase to calculate what distances are needed and to verify proper functionality. Therefore, be sure the secondary side can accommodate the entire rivet length (including the mandrel head), before riveting. Keep in mind, the collapsed height is shorter than the pre-installed height. Since the blind side of the rivet is designed to form into a secondary flange, it is important to leave room for the flange to expand and seat properly. This is especially critical when riveting on brackets and other hardware next to bends, folds, extrusions and/or cutouts on the applications. When designing the primary hole, be sure to calculate the head diameter and its tolerances as well as the layout footprint of the head around the hole. Be sure to account for the riveting equipment in the design phase to prevent the need for customized and potentially costly tooling modifications.Īxial access is required on the primary side being riveted to allow for the flange to overlap the hole without interference. Sufficient clearances are needed so that the tool can access the joint being riveted without interference. Be sure to verify the compatibility of the rivet materials as galvanic corrosion can occur and is seldom considered in the design phase. As a general rule, a rivet should be used in materials equal to or greater than its own strength, although custom rivets can be produced to work in softer materials. Whenever possible, the stronger material should be the secondary side because this is where the setting will take place. It is sometimes necessary to use dissimilar materials such as fastening aluminum to steel or plastics to aluminum. Additionally, the design engineer should calculate the manufacturing tolerances of the hole to ensure proper fit so that interference issues will not occur later. A rivet is only guaranteed to function as designed when the hole size is within the prescribed range. We specify a hole size for every rivet we manufacture. Hole sizes are extremely important for the proper functionality of blind rivets. While the grip may be calculated by adding the thickness of the two materials together, be sure to account for any burrs, bends and manufacturing tolerances which may increase or decrease the overall grip of the materials being riveted. Failure to adhere to the grip range may also cause a premature break or difficulty in clearing the spent mandrel from the setting tool.Īlso be sure to account for the theoretical grip versus the actual grip. Rivets set under-grip can bend and offset, reducing the overall strength and aesthetic appearance. Rivets set over-grip will not retain the mandrel head, causing it to fall out of the rivet body after setting. Setting rivets outside of their specified grip range can lead to functional failures. This thickness is commonly called the grip range. All manufacturers list a range of material thickness in which the product will perform properly. If the rivet is applied over or under its intended grip range, it may not work properly. CBS-CE Closed End Copper/Steel Dome Headĭetermining the length of the rivet is critical to ensure the rivet will function as intended.ACS-IR Open End Aluminum/Steel – Countersunk Head.
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