航空资料25(44)

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Lockbolt strength
characteristics
Clamp force or pre-load: during
the installation process, as
the tool engages and pulls on
the pintail, the joint is pulled
together before the conical
shaped cavity of the nose
assembly is forced down the
collar, progressively locking
(swaging) it into the grooves of
the harder pin. The pin and
swaged collar together form
the installed fastener.
The squeezing action reduces
the diameter of the collar,
increasing its length, which in
turn stretches the pin, generating
a clamp force over the
joint.
Shear strength of lockbolts
varies according to the material
strength and minimal diameter
of the fastener. By increasing
the diameter or the grade
of material, the shear strength
of the fastener can be
increased.
The tensile strength of lockbolts
is dependent on the
shear resistance of the collar
material and the number of
grooves it fills.
• Blind rivets, which are used
when only one side is accessible.
Blind rivets are characterised by
breaking off of the rivet stem
after fastening the connection by
LOCKBOLTS
FIGURE IX.2
BLIND RIVET
FIGURE IX.3
SELF-PIERCING RIVET
FIGURE IX.4
deformation of the rivet (therefore
they are often called
“breakstem rivets”). (Figure IX.3)
• Self piercing rivets do not
require previous drilling. The
rivet part of the bolt is pierced
through the metal sheet. The
further closing motion of the
tool, together with the specially
shaped counter die causes the
rivet head to be formed in such
a way that the pierced sheet is
covered over in the joining
region. (Figure IX-4).
134
ALUMINIUM IN COMMERCIAL VEHICULES CHAPTER IX OTHER JOINING TECHNIQUES 134 | 135
The Snap-Lock is a design which
uses serrated components making
assembly easy and quick.
The snap-lock design allows siding
to be notched and locked
into place without face nailing.
Stresses are distributed over the
entire length of the profile and
not merely concentrated on the
mechanical fixing point (rigidity).
4. Snap-lock & clipping
CLIPPING PRINCIPLE
FIGURE IX.5
Reefer floor assembled
by bonding (Schmitz)
135
EUROPEAN ALUMINIUM ASSOCIATION
136
CHAPTER X
DECORATION
AND FINISHING
1. FOREWORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
2. POSSIBILITIES WITH ALUMINIUM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
3. MECHANICAL FINISHING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
3.1. Brushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
3.2. Polishing / Buffing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
4. CHEMICAL DECORATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
4.1. Anodizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
4.2. Painting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
137
EUROPEAN ALUMINIUM ASSOCIATION
There are several methods for
decoration and finishing of an
aluminium surface. Although all
of the methods used for other
materials are applicable, special
attention has to be paid to aluminium
´s characteristic properties.
In each case, especially the
softness of the surface and the
existence of the oxide layer have
to be considered.
There are 2 main methods of
decoration and finishing:
• Mechanical finishing
- Brushing
- Polishing (or “buffing”)
• Chemical Finishing
- Anodising
- Painting
Today, painting is the most common
way to decorate trucks and
trailers.
Although aluminium can be used
without any surface protection
and keeps its natural beauty
throughout a whole trailer life, it
is most likely to use different surface
treatment methods to optimise
the attractiveness and optical
appearance of a trailer, to protect
it from severe atmospheric
conditions and to give space for
company logos or advertisements.
1. Foreword
2. Possibilities with aluminium
Aluminium tanker (Trailor)
　
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