Adjustment aid for a joining device having a punch and a counter-tool, and method for adjusting the joining device

An adjustment aid for a joining device having a punch and a counter-tool which can be oriented coaxially to one another and can be moved axially towards each other for a joining movement relative to one another, wherein the counter-tool has a die with a free-standing projection projecting toward the punch that comprises an at least partially flat counter surface opposite an at least partially flat punch surface of the punch such that two evaluable closing rings arranged opposite each other can be generated on a body by the punch surface and counter surface during the joining movement.

A method for adjusting a joining device having a punch and a counter-tool which can be oriented coaxially to one another and can be moved axially towards each other for a joining movement relative to one another, wherein the method comprises the following steps:

• performing a joining movement of the punch relative to the counter-tool such that an at least partially flat counter surface of the counter tool, and an at least partially flat punch surface of the punch, are embossed in the test part,
• evaluating the counter-surface and punch-surface embossed in the test part, and
• changing the arrangement of the punch and counter-tool relative to each other to achieve a coaxial alignment of the punch and counter-tool.