A49 .2 .1 .4 .3 PROGRESSION LAMINATION DIE SET UNIT - DESCRIPTION Demountable guide pillars with centre fixing The accuracy of a stamping die starts with the die set. When we designed these new units, special attention was paid to the stability and load capacity of the guide pillars. The eventual introduction of the stripper-mounted pillar in its present form brought an eightfold increase in transverse load-carrying capacity. It is known that a ball or roller bearing guide is less resistant to lateral forces than a plain bearing guide and therefore could not be used in every case up to now for these reasons. At the same time, however, high-speed punching machines require the use of ball-guided tool guides. Application consequences Considerations such as these formed the basis for the development of our new die set units with stripper-mounted pillars – a concept that has resulted in greatly improved accuracy, overall stability and speed capacity. Stroke speed The upper die section, equipped with full-core guide pillars, generates increased mass forces at higher stroke speeds over 500 stroke/min due to the dynamic forces. In order to keep these harmful forces to a minimum, FIBRO Stripper-Mounted Pillars are provided with hollow cores. Retaining slots for matrices and guiding-stripper plate It is of paramount importance to the accuracy of the final die assembly that both these slots are in perfect vertical alignment, to within a few mm. From long experience we know that all heavy machining of die set apertures must precede the finish-machining of the two retainer slots for the matrix inserts and the guiding/clamping stripper plate. Whenever the machining of such apertures is not entrusted to us we will supply our die set units with pre-ground slots only. Combination spring/spacer units The punch guide plate is fitted with pre-clamped spring and spacer units with a compact design. The advantages of these compact units, in accordance with executions 1 to 4, are as follows: ▬ compactness – the combination of both spring- and spacer functions saves die space ▬ Ease of die maintenance – punch regrinding and replacement, as well as dimensional adaptation, can be done without dismantling the stripper. Note: regrinding of punches = regrinding of spacer! ▬ Ease of springs maintenance – after removal of only the top clamping plate, the complete spring/spacer unit can be taken out for replacement etc. This feature applies to executions 1 and 2 only. Top Bolster Stripper-Mounted Pillar Ring Nut Stripper Collar Bottom Bolster
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