Device for extruding hollow and semi-hollow sections

In an extrusion device for use in an extrusion tool including a die plate having two sides and defining a die passageway and opening for the extrusion of hollow sections of light metal, said device being of the type having at least one mandrel disposed on a mandrel support and projecting into the opening of the die, the improvement comprising:

• said mandrel support having a surface disposed on one side of said die plate, said surface including a first part in line with said one side of said die plate and at least one second part recessed from said first part;
• said at least one mandrel having a first side disposed in
• said recess of said at least one second part and a second side projecting into said die passageway, said at least one mandrel being at least partly in line with said die opening;
• at least one screw type connection means comprising a head portion and a stem portion operable for detachably engaging said mandrel in said recess of said at least one second part whereby the stresses at the junction of the mandrel and mandrel support exerted by the extruding metal are reduced and distributed;
• and
• wherein said mandrel and said at least one second part of said mandrel support surface each have a hole defined therein and extending therethrough wherein said stem portion is received within said hole defined in said mandrel support and said head portion abuts the said second side of said at least one mandrel.