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TOX ClinchRivet Technology

Due to the filling of the clinched joint with the TOX ClinchRivet, the strength of the joint increases considerably, and especially the shear strength.

The TOX ClinchRivet is considerably stronger than common pierce rivets and is especially appropriate for use with thin sheet metals.

Advantages:

very high retention forces
symmetrical rivet geometry, thus jam-free feeding and high productivity
lower investment cost than for pierce rivets
simple quality control by measuring the "X" dimension
no cutting of the punch or die side sheet metals
no mechanical notch effect, high dynamic capability
no damage to surface coating
no slugs produced during process
higher process reliability even with unfavorable production conditions, e.g. application with gaps and adhesives between layers
automated process and monitoring is possible
multipoint capability

: Strength comparison of various standard cold forming processes

Why is the TOX ClinchRivet so strong?

: Source: VDI-Z (German Engineers Association) 131 (1989), No.1

The TOX ClinchRivet connection obtains its high strength values from the solid pressed-in rivet and from the mechanical interlock in the joint neck area formed during the deep drawing stage of the process. The specially developed TOX ClinchRivet die with both fixed and moving segments allows this deformation. The diagram on the right shows the material hardness distribution across the neck area of a typical TOX ClinchRivet connection. The diagram clearly shows the interlock area and corresponding hardness values. This connection provides the highest strength values because it does not produce any mechanical stress risers.

TOX ClinchRivet Monitoring

Using the TOX-Monitoring system for Force-Travel-Measurements helps to maintain the ClinchRivet process consistently, thereby, guaranteeing a constant production quality.

Functional principle:

A force sensor measures continuously during the entire joining process. A travel sensor monitors the complete travel. The joining process can then be displayed as a Force-Travel signature curve. With the process monitoring, up to 6 control windows can be defined along the Force-Travel signature curve. This monitoring technique allows controlled checking of the following parameters: material type, sheet metal thickness, number of layers, missing layer, rivet length, die depth, punch failure and pressforce.