Nama : RR
Alvina
NIM :
111221026
Kelas : 2
Aeronautika
Mechanically
Expanded Rivets
Two classes of mechanically expanded rivets are discussed
here:
(1) Nonstructural.
(a) Self-plugging (friction lock) rivets.
(b) Pull-thru rivets.
(2) Mechanical lock, fl ush fracturing, self plugging rivets.
Self-Plugging
Rivets (friction lock)
The self-plugging (friction lock) blind rivets are manufactured
by several. Self-plugging (friction lock) rivets are fabricated in two parts: a
rivet head with a hollow shank or sleeve, and a stem that extends through the
hollow shank. Several events, in their proper sequence, occur when a pulling
force is applied to the stem of the rivet:
(1)
the stem is pulled into the rivet shank;
(2)
the mandrel portion of the stem forces the
rivet shank to expand; and
(3)
when
friction (or pulling action pressure) becomes great enough, it will cause the
stem to snap at a breakoff groove on the stem.
Self-plugging (friction lock) rivets
are fabricated in two common head styles: (1) a protruding head similar to the
MS20470 or universal head, and (2) a 100° countersunk head. Other head styles
are available from some manufacturers.
Material composition of the rivet shank depends upon the
type of material being riveted. Aluminum alloy 2117 shank rivets can be used on
most aluminum alloys. Aluminum alloy 5056 shank rivets should be used when the
material being riveted is magnesium. Steel rivets should always be selected for
riveting assemblies fabricated from steel.
Pull-Thru Rivets
Pull-thru rivets are fabricated in two parts: a rivet head
with a hollow shank or sleeve and a stem that extends through the hollow shank
Several events, in their proper sequence, occur when a
pulling force is applied to the stem of the rivet: (1) The stem is pulled
through the rivet shank; (2) the mandrel portion of the stem forces the shank
to expand forming the blind head and filling the hole.
Pull-thru rivets are fabricated in two common head styles:
(1) protruding head similar to the MS20470 or universal head, and (2) a 100°
countersunk head. Other head styles are available from some manufacturers.
Each company that manufactures pull-thru rivets has a code
number to help users obtain correct rivet for the grip range of a particular
installation. In addition, MS numbers are used for identification purposes.
Numbers are similar to those shown on the preceding pages.
Self-Plugging Rivets (Mechanical
Lock)
Self-plugging (mechanical lock) rivets are similar to
self-plugging (friction lock) rivets, except for the manner in which the stem
is retained in the rivet sleeve. This type of rivet has a positive mechanical
locking collar to resist vibrations that cause the friction lock rivets to
loosen and possibly fall out. Self-plugging (mechanical lock) rivets display
all the strength characteristics of solid shank rivets and in most cases can be
substituted rivet for rivet.
Bulbed Cherrylock Rivets
The large blind head of this fastener introduced the word
“bulb” to blind rivet terminology. In conjunction with the unique residual
preload developed by the high stem break load, its proven fatigue strength
makes it the only blind rivet interchangeable structurally with solid rivets.
Wiredraw Cherrylock Rivets
There is a wide range of sizes, materials, and strength
levels from which to select. This fastener is especially suited for sealing
applications and joints requiring an excessive amount of sheet takeup.
Huck Mechanical Locked Rivets
Self-plugging (mechanical lock) rivets are fabricated in two
sections: a head and shank (including a conical recess and locking collar in
the head), and a serrated stem that extends through the shank. Unlike the
friction lock rivet, the mechanical lock rivet has a locking collar that forms
a positive lock for retention of the stem in the shank of the rivet.
Material
Self-plugging (mechanical lock) rivets are fabricated with
sleeves (rivet shanks) of 2017 and 5056 aluminum alloys, Monel, or stainless
steel.The mechanical lock type of self-plugging rivet can be used in the same
applications as the friction lock type of rivet.Composition of the material
being joined together determines the composition of the rivet sleeve; for
example, 2017 aluminum alloy rivets for most aluminum alloys and 5056 aluminum
rivets for magnesium.
Head
Styles
Self-plugging mechanical locked blind rivets are available
in several head styles depending on the installation requirements.
Diameters
Shank diameters are measured in 1/32-inch increments and are
generally identified by the first dash number: -3 indicates 3⁄32 inch diameter,
-4 indicates 1⁄8 inch diameter, and so forth.
Both nominal and 1⁄64-inch oversize diameters are available.
Grip
Length
Grip length refers to the maximum total sheet thickness to
be riveted and is measured in 1⁄6 of an inch. This is generally identified by
the second dash number. To determine the proper grip rivet to use, measure the
material thickness with a grip selection gauge (available from blind rivet
manufacturers).
Rivet Identification
Each
company that manufactures self-plugging (friction lock) rivets has a code
number to help users obtain the correct rivet for the grip range or material
thickness of a particular installation. In addition, MS numbers are used for
identification purposes
Special
Shear and Bearing Load Fasteners
Many special fasteners produce high strength with light
weight and can be used in place of conventional AN bolts and nuts. Special
fasteners eliminate this loose fit because they are held in place by a collar
that is squeezed into position.
·
Huck Manufacturing Comany
9SP-B A 6 3
9SP-B Head Style
9SP-B = brazier
or universal head
9SP-100 = 100o
countersunk head
A Material
composition of shank
A = 2017
aluminium alloy
B = 5056
aluminium alloy
R = mild steel
6 Shank diameter
in 32nds of an inch:
4 = 1.8 inch 6 =
3.16 inch
5 = 5.32 inch 8
= 1.4 inch
3 Grip range
(material thickness) in 16ths of an inch
·
Military Standard Number
MS 20600 B 4 K 2
MS Military
Standard
20600 Type of
rivet and head style:
20600 =
self-plugging (friction lock) protruding head
20600 =
self-plugging (friction lock) 100o countersunk head
B Material
composition of sleeve:
AD = 2117
aluminium alloy
B = 5056
aluminium alloy
4 Shank diameter
in 32nds of an inch:
4 = 1.8 inch 6 =
3.16 inch
5 = 5.32 inch 8
= 1.4 inch
K Type of stem:
K = knot head
stem
W = serrated
stem
2 Grip range
(material thickness) in 16ths of an inch
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