Apparatus for deep drawing a thermoplastic foil

An apparatus for thermoshaping a thermoplastic foil, the apparatus comprising:

• a stationary frame:
• a lower tool carried on the frame and having an upper face formed with an array of upwardly open mold cavities;
• an upper beam vertically displaceable on the frame above the lower tool;
• a punch plate fixed on the upper beam and provided with an array of downwardly projecting punches fittable in the cavities;
• means for heating the punches;
• a hold-down plate below the punch elate and limitedly vertically shiftable relative thereto, the hold-down plate being formed with an array of holes through which pass the punches;
• means for cooling the hold-down plate;
• actuator means for downwardly shifting the upper beam when the foil is extending horizontally between the lower tool and the hold-down plate for first pressing the foil with the hold-down plate against the upper face of the lower tool and then in an end position pushing the punches through the holes against the foil into the cavities to form pockets in the foil at the cavities and
• a base plate fixed to the upper beam above the punch plate, the punch plate being fixed via the base plate to the upper beam, the base plate having a central mounting pin at which the punch plate is fixed and defining an upright axis, one of the punch and base plates being formed with a plurality of slots aligned radially with the axis and the other of the punch and base plates being formed with a plurality of axially extending guides fitting and slidable radially in the respective slots, whereby on heating and radial expansion of the punch plate, the guides shift radially in the respective slots.

An apparatus for thermoshaping a thermoplastic foil, the apparatus comprising:

• a stationary frame;
• a lower tool carried on the frame and having an upper face formed with an array of upwardly open mold cavities;
• an upper beam vertically displaceable on the frame above the lower tool;
• a base plate fixed on the upper beam and having a central mounting pin defining an upright axis;
• a punch plate fixed to the pin of the base plate and provided with an array of downwardly projecting punches fittable in the cavities;
• means for heating the punch plate and punches, one of the punch and base plates being formed with a plurality of slots aligned radially with the axis and the other of the punch and base plates being formed with a plurality of axially extending guides fitting and slidable radially in the respective slots, whereby on heating and radial expansion of the punch plate, the guides shift radially in the respective slots;
• a hold-down plate below the punch plate and limitedly vertically shiftable relative thereto, the hold-down plate being formed with an array of holes through which pass the punches;
• means for cooling the hold-down plate;
• and
• actuator means for downwardly shifting the upper beam when the foil is extending horizontally between the lower tool and the hold-down plate for first pressing the foil with the hold-down plate against the upper face of the lower tool and then in an end position pushing the punches through the holes against the foil into the cavities to form pockets in the foil at the cavities.