Volkswagen ID.4: Incorrect riveting

Open chamfers

• Open chamfers all around are not permitted. Partially open chamfers up to a gap width of 0.04 mm are admissible.
• Reclinching, e.g. with embossed snap die, is admissible if the tolerances for clinch and rivet head are met.

Non-contacting rivet heads

• Loose rivets are generally not permitted.
• A partial gap up to 0.05 mm is admissible.

Bulging at riveted joint

• When riveting, the rivet material is pressed into the gap thus causing a bending stress of the rivet.
• Bulging of this type is not admissible.

Bulging between riveted joints

• Bulges must not exceed a gap width of 0.3 mm.

Shear cracks

• Cracks which do not overlap are admissible (above).

Notches

• The admissible notch depth is 1/4 × head height -k-.

Rings

• Rings in the clinched head result from using a snap die that is too small.
• The admissible ring depth is 1/4 × head height -k-.
• Ring formation all around is not permitted.

Offset clinched head

• An offset clinched head is not permitted as soon as the clinched head is in contact with the shaft circle and the rivet hole is visible.

Punched rivets

Important

• Stainless steel rivets must not be drilled out or ground due to the risk of corrosion.

Riveting procedure (from left to right)

• Fitting rivet
• Pressing in
• Forming and punching
• Finished punch rivet joint

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