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Study guide 72 Fastening Assembly Training Objective After watching the program and reviewing this printed material the viewer will gain knowledge and understanding of the various fastening devices and assembly methods used in manufacturing ? Various mech

Fastening Assembly Training Objective After watching the program and reviewing this printed material the viewer will gain knowledge and understanding of the various fastening devices and assembly methods used in manufacturing ? Various mechanical fastener types and assembly devices are shown ? Adhesive bonding is explained ? Manual and automated assembly systems are demonstrated ? Major automated assembly machines are illustrated Assembly in manufacturing consists of fastening various components into either a functioning unit or a higher level subassembly Ideally a product design should reduce to a minimum the number of parts requiring assembly In most situations however the fastening and assembly of several component parts is a necessity Assembly may be performed manually semi-automatically or by fully automatic operation using mechanical fastening and or joining methods such as adhesive bonding Mechanical Fastening The most common mechanical fastening methods include ? Integral fasteners ? Threaded fasteners ? Non-threaded fasteners ? Stapling Integral fasteners are formed areas designed into sheet metal products Integral fasteners function by interlocking or interfering one component with other components during assembly The three most common types of integral fasteners include ? Embossed protrusions ? Edge seams ? Hemming Embossed protrusions are formed between two sheet metal components by drawing a small cup-shaped section through them As the metals are squeezed through the components they impact and expand on a die producing a interlocked button with a greater diameter than the drawn section This process is also called clinching or clinch joining Edge seams interlock the edges of sheet metal parts by folding the edges of both components over each other Edge seams not only reinforces the entire assembly but also eliminates sharp edges Hemming assembles sheet metal parts together by bending the edge of one component more than degrees over the edge of another sheet metal component Threaded fasteners are a low-cost means of mechanically joining and holding parts together They are used where subsequent disassembly and reassembly may be required Threaded fasteners include machine screws nuts and bolts and range in size from the miniscule to large diameters and lengths used in bridge and building construction Threaded fasteners are available in both standard and metric sizes as well as a variety of thread types thread pitch tolerances and classi ?cations Threaded fasteners may be installed by hand with common hand tools or by automated machinery In such cases the screws often have special shaped ends such as the cone-shaped point to facilitate automated insertion in mating components Fundamental Manufacturing Processes Study Guide DV PUB - - CFastening Assembly Non-threaded fasteners include ? Rivets ? Pins ? Washers Rivets are one piece permanent mechanical fasteners inserted through matching holes in component parts Various rivet setting devices and tools are then employed to form a head on the opposite end of the rivet clinching the parts together Rivets may be solid semitubular tubular or bifurcated split Riveting can be done manually or automatically A slower but less forceful riveting method is orbital riveting The rivet head is