Rivet Heat Treatment for Monel Rivets (CASA Part 66)
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Questions and Answers

What is natural ageing in the context of rivet heat treatment?

  • Subjecting the alloy to extreme pressure
  • Accelerating the cooling process using liquid nitrogen
  • Allowing the alloy to cool at room temperature (correct)
  • Artificially heating the alloy to a high temperature

    • What is artificial ageing also known as in the context of rivet heat treatment?

  • Quenching
  • Precipitation heat-treatment (correct)
  • Solidification treatment
  • Rapid cooling process

    • How do special (blind) rivets differ from conventional solid-shank rivets?

  • Special rivets can be installed with access to only one end (correct)
  • Special rivets require access to both ends for installation
  • Special rivets are cheaper than solid-shank rivets
  • Special rivets are easier to install

    • What distinguishes blind rivets from solid-shank rivets in terms of installation?

    <p>Blind rivets can be installed with access to only one end</p> Signup and view all the answers

    Which early form of blind rivet was widely used for aircraft construction and repair?

    <p>Cherry friction-lock rivet</p> Signup and view all the answers

    What was one of the original styles of Cherry friction-lock rivets?

    <p>Hollow-shank pull-through</p> Signup and view all the answers

    What type of fasteners are known for their high-strength and are used in close-tolerance holes?

    <p>Jo-Bolts</p> Signup and view all the answers

    How is a Jo-Bolt held tightly in place before driving it through the nut?

    <p>By an adaptor held in place by a hand or power tool</p> Signup and view all the answers

    What happens to the driving flat of the Jo-Bolt after the driving process is complete?

    <p>It breaks off</p> Signup and view all the answers

    What forms a blind head on the inside of the work when a Jo-Bolt is driven?

    <p>The sleeve forced up over the tapered outside of the nut</p> Signup and view all the answers

    What is used to drive a Jo-Bolt through the nut?

    <p>A wrench adaptor gripping the bolt's driving flat</p> Signup and view all the answers

    What is the main advantage of special fasteners over standard AN nut-and-bolt assemblies?

    <p>They eliminate changes in dimension caused by tightening.</p> Signup and view all the answers

    What is the purpose of the lock ring in an Olympic-Lok blind fastener?

    <p>To attach the rivet to the outer shell</p> Signup and view all the answers

    Which material is NOT mentioned as an alloy in the manufacturing of Hi-Lok bolts?

    <p>Copper</p> Signup and view all the answers

    Which type of head styles are available for Olympic-Lok rivets?

    <p>Universal, 100° flush, 100° flush shear</p> Signup and view all the answers

    What is the main advantage of using CherryMAX rivets?

    <p>They are economical and strong</p> Signup and view all the answers

    How is a Hi-Lok installed in a hole?

    <p>Tapped into the hole and secured with a locking collar.</p> Signup and view all the answers

    What is the purpose of the safe-lock locking collar in a CherryMAX rivet?

    <p>To secure the rivet in place</p> Signup and view all the answers

    What tool is used to tighten the Hi-Lok retaining collar?

    <p>Specially prepared tools</p> Signup and view all the answers

    What happens to the wrenching device after the Hi-Lok retaining collar is tightened?

    <p>It shears off</p> Signup and view all the answers

    In what range of diameters are CherryMAX rivets available?

    <p>1/8, 5/32, 3/16, 1/4</p> Signup and view all the answers

    Why are HuckLoks generally limited to aircraft manufacturers and large repair facilities?

    <p>Due to their high cost</p> Signup and view all the answers

    What type of heads are available for Hi-Lok bolts?

    <p>Flat and countersunk heads</p> Signup and view all the answers

    How should special fasteners be removed?

    <p>By turning the washer-nut with a box end wrench</p> Signup and view all the answers

    What is the correct process for removing a flush-type jo-Bolt?

    <p>Drill a pilot hole deeper than the inside of the head of the nut</p> Signup and view all the answers

    What tool should be used to tap the remaining fastener out of its hole?

    <p>Mallet</p> Signup and view all the answers

    When removing a special fastener, what is the purpose of using a pair of vise-grips?

    <p>To turn the fastener</p> Signup and view all the answers

    Which tool is used to drive the remainder of the shank and blind head from a flush-type jo-Bolt hole?

    <p>Pin punch</p> Signup and view all the answers

    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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    Related Documents

    Rivet Specifications and Standards PDF

    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.

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