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Questions and Answers
What is natural ageing in the context of rivet heat treatment?
What is artificial ageing also known as in the context of rivet heat treatment?
How do special (blind) rivets differ from conventional solid-shank rivets?
What distinguishes blind rivets from solid-shank rivets in terms of installation?
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Which early form of blind rivet was widely used for aircraft construction and repair?
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What was one of the original styles of Cherry friction-lock rivets?
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What type of fasteners are known for their high-strength and are used in close-tolerance holes?
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How is a Jo-Bolt held tightly in place before driving it through the nut?
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What happens to the driving flat of the Jo-Bolt after the driving process is complete?
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What forms a blind head on the inside of the work when a Jo-Bolt is driven?
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What is used to drive a Jo-Bolt through the nut?
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What is the main advantage of special fasteners over standard AN nut-and-bolt assemblies?
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What is the purpose of the lock ring in an Olympic-Lok blind fastener?
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Which material is NOT mentioned as an alloy in the manufacturing of Hi-Lok bolts?
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Which type of head styles are available for Olympic-Lok rivets?
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What is the main advantage of using CherryMAX rivets?
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How is a Hi-Lok installed in a hole?
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What is the purpose of the safe-lock locking collar in a CherryMAX rivet?
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What tool is used to tighten the Hi-Lok retaining collar?
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What happens to the wrenching device after the Hi-Lok retaining collar is tightened?
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In what range of diameters are CherryMAX rivets available?
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Why are HuckLoks generally limited to aircraft manufacturers and large repair facilities?
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What type of heads are available for Hi-Lok bolts?
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How should special fasteners be removed?
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What is the correct process for removing a flush-type jo-Bolt?
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What tool should be used to tap the remaining fastener out of its hole?
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When removing a special fastener, what is the purpose of using a pair of vise-grips?
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Which tool is used to drive the remainder of the shank and blind head from a flush-type jo-Bolt hole?
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Study Notes
HuckLoks
- Limited to aircraft manufacturers and large repair facilities due to expensive tooling required for installation
- No additional information provided
Olympic-Lok Blind Fasteners
- Lightweight, mechanically locking spindle-type blind rivets
- Feature a lock ring stowed on the head that slips down the stem and locks the centre stem to the outer shell during installation
- Require specially designed installation tools
- Available in three head styles: universal, 100° flush, and 100° flush shear
- Rivet diameters: 1/8, 5/32, and 3/16 in
- Installation tools fit both countersunk and universal heads in the same size range
CherryMAX Rivets
- Economical to use and strong enough to replace solid-shank rivets size for size
- One size puller can be used to install all sizes of CherryMAX rivets
- Composed of five main parts: pulling stem, driving anvil, safe-lock locking collar, rivet sleeve, and bulbed blind head
- Can be used in extremely high temperatures
- Available in diameters: 1/8, 5/32, 3/16, and 1/4 in
Hi-Lok Bolts
- Manufactured in various alloys: titanium, stainless steel, steel, and aluminium
- Possess sufficient strength to withstand bearing and shearing loads
- Available with flat and countersunk heads
- Can be installed with wrenching lock nuts or standard AN bolts and nuts
- Installation process: drill hole with interference fit, tap in Hi-Lok, and install shear collar
Removal of Special Fasteners
- Remove washer-nut or locking collar using a box-end wrench or vise-grips
- Tap the remaining fastener out of its hole using a mallet
- For flush-type Jo-Bolt removal, drill a pilot hole, then drill out the shank and blind head using a pin punch
Rivet Heat Treatment
- Natural ageing: alloy cools at room temperature, taking several hours or weeks
- Precipitation heat-treatment (artificial ageing and precipitation-hardening): accelerates the process by applying a slightly elevated temperature for an extended period
Special Rivets and Fasteners
- Special rivets (blind rivets) are installed with access to only one end of the rivet
- Blind rivets are more expensive than solid-shank rivets but find many applications in the aircraft industry
Friction-Lock Rivets
- Cherry friction-lock rivets were one of the first widely used blind rivets in aircraft construction and repair
- Originally available in two styles: hollow-shank pull-through and self-plugging types
Jo-Bolt Fastener
- Patented high-strength structural fasteners used in close-tolerance holes where strength requirements are high but physical clearance precludes the use of standard AN, MS, or NAS bolts
- Installation process: drill, ream, and countersink hole, then insert Jo-Bolt and hold tightly in place with a nose adaptor
- A wrench adaptor grips the bolt's driving flat and screws it up through the nut, forming a blind head on the inside of the work
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Description
Learn about the heat treatment process for Monel rivets, specifically focusing on natural ageing and precipitation heat-treatment. Understand the methods to accelerate the process and attain the required properties.
