bonding and surface carachteristics · 2016-05-24 · bonding and surface carachteristics aipi –...
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Stand: 03/12
Bonding and surface carachteristics
AIPI – Milano, 15 May 2014
DELO Industrial Adhesives – Stefano Farina
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Stand: 03/12
Introduction
� The quality of the surface decides on the bonding
� Only defined surfaces enable a defined bonding
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Stand: 03/12
Advantages of bonding
� Manifold material combinations
� Constant tension distribution
� Low thermal influencing
� Isolation and corrosion protection
� Method combination with other joining methods
� Production automation
� Miniaturization
� Properties of assembly materials are maintained
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Stand: 03/12
Adhesion and cohesion
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Stand: 03/12
� Alcohols, e.g. ethyl alcohol, isopropanol- excellent for tensiles and salts (polar)- good for fats and oils
� Ketones, e.g. acetone, MEK- good for fats and oils (polar)
� Ester, e.g. ethyl acetate- universal cleaning effect, strong exhalation, relatively long evaporation
� Hydrocarbons, e.g. cleaning agent,DELOTHEN NK1 und NK3- excellent for fats and oils- less suitable for polar impurities
1. Cleaning, degreasing…….
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Stand: 03/12
Residua after cleaning ����
Residua free cleaning ☺☺☺☺
1. …..and removing !!
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Stand: 03/12
2. Sufficient bonding area
m = 1.500 kg
F = G = 15.000 N
A = 10 x 10 cm² = 10.000 mm²
σ = F / A = 15.000 N / 10.000 mm²
Tensile strength: σσσσ = 1,5 N / mm²
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Stand: 03/12
3. Bonding-optimized design
Bonding-optimized design means:
� large bonding areas
� only shear and tensile stresses
� avoid peel and bending stresses
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03/2011
Example – sealing of a housing
Tongue and groove connection
Housing
Cover
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03/2011
Worst case scenario - example
Subsequent bonding and sealing of an existing tongue and groove
Current design
The customer‘s idea for sealing:
� Adhesive application (red)
� Joining of the components
Problem: During joining, the adhesive (red) is sheared off
Wetting is undefined.
The gap is too small to form a bonding layer.
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03/2011
Better case scenario - example
Sealing and bonding of a tongue and groove connection
� Project in the design phase
The customer‘s idea:
� Adhesive application in the grooves
� Joining of the components
Problem:
� Trapped air when joining the components
� Uncontrolled spreading of the adhesive
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03/2011
Best case scenario - example
Sealing and bonding of a tongue and groove connection
� Suggestion for improvement in cooperation with the customer
Design:
� Guide groove for centering the connection
� Area which can take up adhesive
� Bead dispensing in the groove
Joining of the components:
� The adhesive spreads evenly in the gap
� No trapped air
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Stand: 03/12
4. Bonding-optimized design
� Provide a constant and sufficient bondline thickness:
Adhesive layer thickness d
Adh
esio
n st
reng
th
Source: Habenicht