Profile designing  
 
 

 

Profile designing

Die designing

Die machining

Extrusion

Anodizing

Powder coating

Wrapping

Fabrication

Aluminium glossary


 
 
      
Basic design guidelines for aluminium extrusion
 


There are many factors that impact on designing with aluminium extrusions. It is impossible to cover these here, but to help there are a number of illustrations following which will guide you in the right direction. These are intended to inspire you with the immense flexibility aluminium in its extruded form afford.

Photo: Alumiinium profile design

 
Photo: aluminium profile 3D Uniform wall thickness
It is acceptable to have a range of wall thicknesses within a single profile, however uniform wall thickness make the profile easier to extrude.
It is an advantage if the internal and external wall thicknesses are similar - this decreases die stress and improves extrude ability.
It is acceptable to have walls of different thicknesses where the advantage outweigh the disadvantage - eg. for strength reasons it may be best to concentrate weight away from the centre of mass.
 

Use of soft lines
Extrusion cannot achieve razor sharp corners. Corners need to be rounded and often 0.5-1mm is sufficient.
A design may sometimes demand sharp internal angles to enclose shapes - this is overcome by incorporating a small cut out.
Sharp tips should be avoided where possible as the tip can become wavy and uneven - should also be rounded.
Profiles with large variations in wall thickness cool unevenly. This gives a visible structural unevenness that is particularly marked after anodizing.

 
Profile to Profile Hinges
A simple hinge - The ball diameter should never be less than 5mm. Including a screw port into the hinge design allows the assembly to be easily locked longitudinally using inserts and self-tapping screws.
Photo: Aluminium profile hinge
 
Jointing Screw Ports
Screwports can be used to join sections in many ways. They can be tapped to suit machine screws or used plain to suit self tapping screws. Small nibs can be added to help centralize the screws.
 

Photo: screw port

 
Screws can also be placed in vertical slots as per the sections shown. Some tapping screws can be used to pierce the the base of the section if required.
Where possible screwports should be open with a recommended opening of 60 deg. Some closed designs are possible as per the right hand section but need to be discussed fully with us.
 

 
Solid or hollow profiles
Solid profiles reduce die costs and are often easier to produce, so where possible, consideration should be taken to determine whether a profile needs to include cavities.

Photo: hollow profile

Reducing the number of cavities in a hollow profile makes it easier to extrude. this increases die stability.




2010 All rights reserved.