7.8 Riveting Flashcards
What are solid shank rivets?
Solid shank rivets are the most common type of rivet found in aircraft construction. They are used to join aircraft structures and are low cost as well as one of the oldest and most reliable types of fasteners.
What are the characteristics of solid shank rivets?
Solid shank rivets are permanent fasteners, quicker to install than a nut & bolt, and can be installed using high-speed installation tools.
When should rivets not be used?
Rivets must not be used in thick materials or where the load is subject to tension, as their tensile strengths are low relative to their shear strength.
What happens to riveted joints without sealants?
Riveted joints are not airtight or watertight unless sealants are used.
How are rivets removed?
Since rivets are permanently installed, they must be removed by drilling them out.
What are the three types of riveted joints used in aircraft?
The three different types of riveted joints are lap joints, flush joints, and joggle joints.
What factors govern the strength of a riveted joint?
The factors that govern the strength of a joint are material specification, rivet specification, and rivet spacing.
What are lap joints?
Lap joints have their skin riveted together, resulting in a distinct step or change in levels, and are not aerodynamically smooth.
Where are lap joints generally used?
Lap joints are generally used on light aircraft where aerodynamic smoothness is not as critical.
What are flush joints?
Flush joints are used to obtain aerodynamic smoothness between two skins, with both skins riveted to the same substructure.
What is a flush patch repair?
A flush patch repair is an example of a flush joint, maintaining aerodynamic smoothness by riveting the skin with an insert of the same thickness.
What are joggle joints?
A joggle joint is a combination of a flush and a lap joint, where one skin is joggled to accommodate the other to produce one smooth side.
What is rivet spacing?
Rivet spacing is the distance between fastener rows, typically taken from the hole centres, and is usually 4 to 5D.
What is the pitch of a fastener?
The pitch of any fastener is the distance from the centre of one fastener hole to the centre of the next fastener hole in a row, quoted in terms of the fastener nominal shank diameter D.
What is edge margin in fasteners?
Edge margin is the distance from the centre of the fastener hole to the nearest edge of a sheet, and is generally 2D to 2.5D times the diameter of the rivet.
What is the sphere of influence of a rivet?
The sphere of influence is the area of sheet metal over which a rivet achieves a watertight joint, typically 5D.
What is inter-rivet buckling?
Inter-rivet buckling occurs when incorrectly widely-spaced rivets allow a panel to deform between the rivets, which can be minimized by closely spacing the rivets.
What tools are required for installing a rivet?
Tools include drills, reamers, rivet cutters, bucking bars, riveting hammers, draw sets, dimpling equipment, countersinking equipment, rivet guns, and rivet squeezers.
What is the purpose of a rivet cutter?
A rivet cutter is used to cut rivets to a required length when a rivet of the required length is unavailable.
How do you use a rotary rivet cutter?
Insert the rivet in the correct diameter hole, place the required number of shims under the rivet head, and squeeze the cutter like pliers.
What caution should be taken when using a rivet cutter?
Using a rivet cutter can leave burrs and sharp edges, which can cause scratches and personal injury.
What is a bucking bar?
A bucking bar is a heavy steel tool used during rivet installation to set the shop head (tail) of the rivet.
What are the weight ranges for bucking bars?
Bucking bars range from 0.5 kg to 4.5 kg (1.1 lbs to 9.92 lbs).
What material are bucking bars typically made from?
Bucking bars are made from low carbon steel that has been case hardened.
