Attachment via the head geometry
With this type of attachment, the cutting punch is clamped between the punch backing plate and the punch retainer plate via the head shape. The most commonly used shapes are conical, cylindrical and bottle-neck head shapes. The choice of shape depends, amongst others, on the punching and retracting forces, the expected service life and the available space. The most common type, the cutting punch with conical head according to DIN 9861, is advantageous because it requires little space. The cutting punch with cylindrical head according to ISO 8020 requires a little more space, but allows for easier installation and withstands greater retracting forces. Meusburger also offers this punch ready-to-use with an exact head height (E 55405), so grinding the head is no longer necessary.
Cutting punches with bottle-neck according to DIN 5118 or cutting punches with a 30° conical head are suitable for very high retracting forces. Even though the cutting punch with bottle-neck requires less space, it needs a complicated support, which can be introduced using a counterbore tool (WZB 318128) or a mounting sleeve (E 55301). Cutting punches with cylindrical head according to DIN 9844 have a head height of 4 mm independent of the head diameter, which can simplify installation. All versions are readily available as standard parts from Meusburger.
Screwed-in cutting punches
The cutting punch is screwed to the head plate via a flange or a fixing hole on the front end.
For wire EDM contour punches, this fixing option allows for a relatively simple production of the punch. In addition, thanks to the small space requirement, the cutting punches can be placed close together. Underlaying the cutting punches for height compensation after regrinding is also easily possible.
Positive locking connection via punch suspension piece
This attachment option is particularly suitable for filigree punches. Thanks to the standardised punch suspension pieces, an introduction of fixing threads in the punch is no longer necessary; instead, a radius contour is cut in. The bearing is floating in order to avoid unwanted forces on the punch. Underlaying the punches is very easy here, too. However, it must be ensured that both the punch and the retainer clip are underlaid so that the bearing of the punch is guaranteed to be floating.
