Patent ID: 6682330
Filing Date: 2004-01-27
Classification: B29C

Abstract:
A forming device for an extrusion plant having at least one calibrating device comprising at least one calibrating tool, each calibrating tool comprising a plurality at calibration dies arranged one after another in an extrusion direction,(a) each calibration die having at least one calibration orifice with several forming surfaces bounding the calibration orifice and applied against an object being extruded, first and second end faces extending perpendicularly to the forming surfaces and parallel to each other, the first and second end faces being, spaced from each other in the extrusion direction, and side faces extending between the first and second end faces, the first end face facing an inlet region and the second end face facing an outlet region for the object being extruded, (b) a cavity between facing ones of the end faces of two immediately adjacent ones of the calibration dies extending from the calibration orifice to at least one passage applying a vacuum to the cavity, the cavity being open across a predominant part of the periphery of the calibration orifice towards the calibration orifice and forming (1) a first part end face on the calibration die where the cavity has a first width of 0.2 mm to 3.0 mm across a first distance of 0.3 mm to 5.0 mm from the forming surfaces in a direction perpendicular thereto and (2) a second part end face on the calibration die where the cavity has a second width of 1.0 mm to 2.5 mm across a second distance of 6.0 mm to 20.0 mm from the first part end face perpendicular to the forming surfaces, and (c) means cooperating with the calibration device to carry away heat.