Forming device for an extrusion plant

Forming device as claimed in one or more of the preceding claims, characterised in that the width of the cavity is between 0.2 mm and 3.0 mm between the facing end faces of immediately adjacent calibration dies across a first distance of 0.3 mm to 5.0 mm, preferably 0.5 mm to 2.0 mm, starting from the forming surface in a direction perpendicular thereto and forms first part end faces on the calibration die.

Forming device as claimed in one or more of the preceding claims, characterised in that the width of the cavity between the first distance and another distance of from 6.0 mm to 20.0 mm, starting from the first distance in a direction perpendicular to the forming surface, is between 1.0 mm and 2.5 mm and forms second part end faces on the calibration die.

Forming device as claimed in one or more of the preceding claims, characterised in that adjoining the second distance, the width of the cavity is of a width between 2.5 mm and 10.0 mm and forms third part end faces on the calibration die.

Forming device as claimed in one or more of the preceding claims, characterised in that the width of the cavity across the circumference of the calibration orifice differs in the region of the first part end faces.

Forming device as claimed in one or more of the preceding claims, characterised in that there is a radius of between 0.1 mm and 1.0 mm in the transition region between the forming surfaces and the immediately adjacent first part end faces of the calibration dies.

Forming device as claimed in one or more of the preceding claims, characterised in that on the sides remote from the calibration orifice in the region of the opposing first side faces of the calibration die, the cavity is bounded by strip-shaped structural parts.

Forming device as claimed in one or more of the preceding claims, characterised in that the cavity is formed by a recess in one of the end faces of the calibration die.

Forming device as claimed in one or more of the preceding claims, characterised in that in the region of the other side faces of the calibration die, the cavity opens into at least one passage.

Forming device as claimed in one or more of the preceding claims, characterised in that the passage is connected via a suction line to at least one suction device, in particular a vacuum generator.

Forming device as claimed in one or more of the preceding claims, characterised in that the part end faces on the calibration dies face the inlet region of the object fed through the calibration device.

Forming device as claimed in one or more of the preceding claims, characterised in that several flow orifices for a tempering medium are provided in the calibration die immediately adjacent to the calibration orifice.

Forming device as claimed in one or more of the preceding claims, characterised in that the flow orifices extend through the calibration die in parallel alignment with the forming surfaces and perpendicular to the end faces.

Forming device as claimed in one or more of the preceding claims, characterised in that the flow orifices extend through the calibration die in the region between the two part end faces.

Forming device as claimed in one or more of the preceding claims, characterised in that the flow orifices in immediately adjacent calibration dies are aligned respectively flush with one another.

Forming device as claimed in any one of the preceding claims, characterised in that at least one seal is provided between the calibration dies arranged immediately one after the other and the respective flush-aligned flow orifices.

Forming device as claimed in one or more of the preceding claims, characterised in that a connecting piece is provided between the immediately adjacent calibration dies and respective flush-aligned orifices connecting the flow orifices to one another.

Forming device as claimed in one or more of the preceding claims, characterised in that the connecting piece projects out from the second part end face and an overhang thereof corresponds more or less to the second width of the cavity.

Forming device as claimed in one or more of the preceding claims, characterised in that several flow orifices arranged adjacent to one another and preferably cooperating with a forming surface form a flow group and are connected by a common incoming and outgoing line.

Forming device as claimed in one or more of the preceding claims, characterised in that the delivery line for the flow orifices is provided in the second calibration die and the discharge line is arranged in one of the last calibration dies of the calibration tool.

Forming device as claimed in one or more of the preceding claims, characterised in that the at least one other flow orifice is provided in the calibration die in the region of a projection protruding out from the forming surface and bounded by part forming surfaces in order to form groove-shaped sections in the contour of the object fed through.

Forming device as claimed in one or more of the preceding claims, characterised in that the other flow orifice is aligned parallel with the first flow orifices.

Forming device as claimed in one or more of the preceding claims, characterised in that the other flow orifice extends starting from the first calibration die through to the last calibration die.

Forming device as claimed in one or more of the preceding claims, characterised in that the other flow orifice is connected to a delivery line into the first calibration die.

Forming device as claimed in one or more of the preceding claims, characterised in that at least one suction passage co-operates with the other flow orifice across the longitudinal extension thereof.

Forming device as claimed in one or more of the preceding claims, characterised in that the other flow orifice is connected to a suction device in the region of the last calibration die.

Forming device as claimed in one or more of the preceding claims, characterised in that the two facing end faces of two immediately adjacent calibration dies are arranged in abutment at least in regions around the periphery of the other flow orifice.

Forming device as claimed in one or more of the preceding claims, characterised in that the two facing end faces of two immediately adjacent calibration dies are applied one against the other running across the periphery of the other flow orifice.

Forming device as claimed in one or more of the preceding claims, characterised in that the a cooling passage is recessed into the first calibration die in the region of the end face facing the outlet region across a predominant part of the periphery of the calibration orifice.

Forming device as claimed in one or more of the preceding claims, characterised in that the calibration die is made in a single piece.

Forming device as claimed in one or more of the preceding claims, characterised in that the calibration die is of a thickness of between 6.0 mm and 60.0 mm, preferably between 15.0 mm and 40.0 mm in the direction perpendicular to the end faces.