LIDECO Standard Parts 07/2022

E38 subject to alterations ASSEMBLY GUIDE LINES FOR HEAD TYPE PUNCHES WITH ROUND POINTS Description: Head type punches with round point (DIN 9844) are intended for floating assembly in the punch retainer. If there is sufficient clearance between the cutting punch, punch mounting plate and pressure plate, bending stresses can be avoided that can be caused by misalignments. a) for rigid installation b) with forced centring by the countersunk head.With punches held in this manner, a clear separation between transmission of perforation force and guiding is achieved. In order to facilitate assembly of punches of different diameters, the height of the heads is standardized to 4 +0.2 mm (DIN 9844). Guide Lines: excerpts from DIN 9844, page 5 d 1 max. = stock thickness Stripping force: for d 1 from 1 to 5 mm = 20% of the cutting force for d 1 from 5.1 to 16 mm = 10% of the cutting force Cutting material: max. &dew; B = 400 N/mm 2 Punch retainer plate made from St 50-2 with σ D perm. = 300 N/mm 2 Locating hole in the punch retainer plate: 1.05 x d 1 or d 2 Clearance punch head/percussion plate = 0.02 mm.