Joining Technologies:

Introduction:

Fastening is certainly one area of appliance assembly that requires manufacturers to carefully weigh solution benefits and drawbacks. Options range from clinching and spot welding to self-piercing fasteners, standard rivets and even adhesive bonding. The best applicable technology is determined by the demands on quality of the final product, available production time and the investment budget. There's a strong interaction between these three factors:

Wisselwerking: geld, tijd en kwaliteit

Naturally, manufacturing/assembly considerations also have to be taken into account. The choice for the optimal joining technology also depends on:

Joining methods:

To narrow down the fastening options, the joining technologies can be subdivided into three categories:

Riveting:

Verborg Engineering specializes in automating mechanical fastening processes in medium to high production runs. Riveting processes can be automated easily by CNC-controlled riveting heads. Semi-automatic riveting brings efficiency improvements within reach of almost every mounting or assembling process. The advantages are, among others:

Comparison of Joining Technologies:

The table below shows the benefits and drawbacks of six different joining technologies; four mechanical methods, one welding method and one adhesive bonding method. Most of the results are gathered from a research project of Böllhoff ('Böllhoff is one of the leading suppliers of joining and assembly technologies in Europe and America').

  Radial/Orbital Riveting Clinching Self Pierce riveting Screw fastening Spot Welding Bonding
Corrosion of coated material Little Little Little Little High None
Joining and strength alteration at joining point None None None None Yes None
Dynamic load-resistance Good Very good Very good Less good Less good Very good
Crush load-resistance Less good Less good Very good Less good Less good Good
Static load-resistance
1. Shearing stress
2. Head Stress

Very good
Very good

Good
Good

Very good
Very good

Very good
Very good

Very good
Very good

Good
Good
Edges - Burring - Splinters None None None Edges None None
Joining consumable required Rivet None Punch rivet Nuts, bolts, washers, tap None Glue
Energy consumption Little Little Little Little Very high Very high
Materials All solid materials Only metals Only metals All solid materials Only some metals All solid materials
Environmentally friendly Good Good Good Good Poor Very poor
Handling Simple Simple Simple Simple Simple Time consuming
Reproducibility Very good Very good Very good Good Satisfactory Good
Dependence of joint result on surface quality None Little None Little High Very High
Pre-processing Drilling None None Drilling Washing, etching Washing, etching
Possibility of joining different materials Very Good Poor Poor Very Good None Very good
Possibility of joining fragile parts Very good None None Good None Very good
Investments Medium High High Low Medium Very high

Conclusions:

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