E52 0,02 1 d s 1,05 x d1 Top Bolster Percussion Plate Punch Retainer Intermediate Plate (omitte if punch retainer c´boed for punch heads) Stripper (guiding type) Guide Pillar Matrix Plate Bottom Bolster Head Type Straight Punch DIN 9844 clearance punch head/percussion plate = 0,02 mm PUNCHES DIN 9844 - INSTALLATION GUIDELINES 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 d1 max. = stock thickness Stripping force: for d1 from 1 to 5 mm = 20% of the cutting force for d1 from 5.1 to 16 mm = 10% of the cutting force Cutting material: max. &dew;B = 400 N/mm2 Punch retainer plate made from St 50-2 with σD perm. = 300 N/mm2 Locating hole in the punch retainer plate: 1.05 x d1 or d2 Clearance punch head/percussion plate = 0.02 mm.
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