This eliminated any spin out issues due to cross threading which would cost the OEM downtime on the assembly line. The following results were obtained:įrom this data, the M8 steel wedgehead rivet nut was chosen as it offered spin out values that were higher than the assembly torque. Sherex testing procedure was to install rivet nuts of various materials and configurations to determine the best option. An M8 thread size was selected by the OEM, with an assembly torque of 21 Nm for the mating screw. Spin out (the torque required to turn a rivet nut in the base material) and corrosion resistance where the two primary concerns for the fastener. Sherex conducted a study to determine the best fastener to attach the component to the vehicle. If you’re looking for a fastener that provides fast installation at minimal cost a rivet nut is the ideal solution and can easily be installed by air rivet nut tooling or hand tooling.Fastening to aluminum and composite materials has become a bigger issue today with the increased use of these materials in manufacturing due to the weight savings and/or lower cost these materials may offer relative to steel.Īn automotive OEM was developing an accessory for a vehicle that required aluminum as the base material for weight reduction requirements and corrosion protection. Rivet nuts were made to be automated and can be used with a six-axle robot or other automated assembly tools. In some manufacturing settings, rivet nuts are preferred because they enable faster assembly at reduced costs. Closed end type rivet nuts are ideal if you’re looking for a sealed end rivet nut, providing an effective option for the ingress of water. They come in two variations of end style – either open ended where the bolt can protrude through the rivet nut without obstruction, or a closed end type. They can be made from steel, stainless steel, brass, and other materials, and are not affected by heat, which makes them more convenient for applications such as plastic or wood where conventional welding is impractical. Rivet nuts are more versatile than self-tapping screws or pressed inserts. We’ve already mentioned aviation manufacturing, but rivet nuts can also be used for appliances, automotive manufacturing, office furniture, playground equipment, solar installations, electronics, boats, pools and hot tubs, military equipment, and even bicycles. Rivet nuts offer a number of advantages that make them suitable for various applications where other blind rivets won’t do. The rivet nut itself can be installed into a variety of a different materials including metal, plastic, fiberglass and carbon fiber. Once the rivet nut is installed, fasten your material through the rivet nut with any compatible externally threaded fastener and you’re all set. No need to struggle to reach around the back of the bolt to fasten the material with a nut. Meaning, these fasteners can be installed securely from one side of the work piece. But they are also still important components for aviation.Ī main strength of rivet nuts are that, just like with traditional rivets, they are blind. Rivnuts are now available in many variations and sizes and therefore used for many different fastening capabilities. The rivnuts were first used to mount de-icing boots to aircraft wings. The makeup of a rivnut is one piece that is threaded internally which is able to be anchored entirely on one side. They are also known as blind rivet nuts or threaded inserts. Rivnuts were originally developed in the late 1930s by the BF Goodrich Company and sold under the trademark RIVNUT®.
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