Stamping Press

Abstract

A stamping press includes a fixed lower body with a machine bed, a mobile upper body or press carriage, a lower cushion which constitutes a mobile body in respect of the lower fixed body, an upper cushion which constitutes a mobile body in respect of the upper mobile body, a die-cutting assembly formed of the top part of the die-cutting assembly integral to the upper mobile body, and a bottom part of the die-cutting assembly integral to the machine bed, and a guiding device ( )for the top part of the die-cutting assembly in respect of the bottom part of the die-cutting assembly, the lower cushion including a single hydraulic cylinder with an annular section fitted in the central part of the machine bed, hollow in the centre, this central part constituting the zone for removal of scrap or cuttings produced by the die-cutting performed in the stamping process.

What is claimed is: 
     
         1 . A stamping press, which comprises:
 a fixed lower body provided with a machine bed;   a mobile upper body;   a lower cushion which constitutes a mobile body in respect of the fixed lower body;   an upper cushion which constitutes a mobile body in respect of the mobile upper body;   a die-cutting assembly having a top part thereof integral to the upper mobile body, and a bottom part thereof integral to the machine bed;   a guiding device for guiding the top part of the die-cutting assembly in respect of the bottom part of the die-cutting assembly;   wherein the lower cushion comprises a single hydraulic cylinder with an annular section placed in a central part of the machine bed, having a hollow central part constituting a zone for removal of scrap and cuttings produced by a die-cutting operation performed in the stamping press.   
     
     
         2 . A stamping press, according to  claim 1 , further comprising a lower adapter plate fitted in a housing made in the machine bed, said lower adapter plate being provided with through-bores for removal of the scrap and cuttings, as well as for allowing transmission pins therethrough of a lower stripper incorporated in said press. 
     
     
         3 . A stamping press, according to  claim 1 , further comprising a bottoming die of the machine bed, fitted in a bottom part of the machine bed. 
     
     
         4 . A stamping press, according to  claim 1 , further comprising a bottoming die of the lower cushion joined to the hydraulic cylinder. 
     
     
         5 . A stamping press, according to  claim 1 , wherein: the mobile upper body includes:
 a base plate of the upper cushion;   a bottoming die of the upper cushion; and   a hydraulic cylinder for the upper cushion;   a position detection device;   a plate for adaptation to the mobile upper body fitted on the base plate of the upper cushion; and   transmission pins of the base plate for adaptation to the mobile upper body.   
     
     
         6 . A stamping press, according to  claim 1 , wherein the bottom part of the die-cutting assembly is made up of the following connected parts:
 a lower die-cutter holder plate which houses guide columns;   a lower bottoming die;   a lower punch holder plate;   a punch press plate;   a punch;   a lower stripper;   a set of lower transmission pins;   a set of guide bushes of the lower stripper; and   a set of guide columns of the lower stripper.   
     
     
         7 . A stamping press, according to  claim 6 , wherein the punch press plate comprises a flange for holding the punch; and the punch has a recess for insertion of this flange. 
     
     
         8 . A stamping press, according to  claim 1 , wherein the top part of the die-cutting assembly is made up of the following connected parts:
 an upper die-cutter holder plate which houses guide bushes;   an upper bottoming die plate;   an upper punch holder plate;   an upper guide plate;   an upper die shoe plate;   an upper die;   an upper stripper; and   transmission pins of the upper stripper.   
     
     
         9 . A stamping press, according to  claim 8 , wherein the top part of the die-cutter assembly also comprises at least one piercing punch. 
     
     
         10 . A stamping press, according to  claim 5 , wherein both the hydraulic cylinder of the upper cushion and the hollow hydraulic cylinder of the lower cushion, comprise internal guides for guiding movement of corresponding plungers and external scrapers for removing dirt. 
     
     
         11 . A stamping press, according to  claim 6 , wherein the lower punch holder plate comprises a plurality of cavities in which different punches are housed. 
     
     
         12 . A stamping press, according to  claim 8 , wherein the upper die shoe plate comprises a plurality of cavities in which different upper dies are housed in accordance with different lower punches housed in cavities of a lower punch holder plate. 
     
     
         13 . A stamping press, according to  claim 6 , wherein the punch is anchored to the lower die-cutter holder plate by a securing part provided with a flange, the securing part being fixed to one of:
 the lower die-cutter holder plate and   the lower bottoming die of the die-cutter.   
     
     
         14 . A stamping press, according to  claim 6 , wherein the punch is anchored to the lower die-cutter holder plate by a securing part with a housing for a ring, the punch comprising a recess for partially housing said ring, the securing part being fixed to one of:
 the lower die-cutter holder plate and   the lower bottoming die of the die-cutter.