FIELD: manufacture of long products from powders of various, including polymeric, materials.
SUBSTANCE: can be used for the manufacture of long hollow products with various cross-sectional shapes, the area of which is equal to or greater than the cross-sectional area of the extruder. The device contains a die 1, a mandrel holder 3 located at its inlet, including a rim 10 and ribs 11, and a mandrel 2 fixed on the ribs 11. The spinneret 1 and the mandrel 2 form a deforming channel 4 along its length, a forming channel 5 and a calibrating channel 6. In the area of the deforming channel 4, the working surfaces of the die 1 and the mandrel 2 have profiled helical protrusions 7&8 located in the circumferential direction with an equal and identical angular pitch for the die 1 and the mandrel 2. The ribs 11 of the mandrel holder 3 have an aerodynamic profile identical to the shape of a biconvex aerodynamic profile of an aircraft wing. The step of the helical lines passing through the intersection points of the symmetry axes of the cross-sections of the helical projections 7, 8 of the die and the mandrel with their surface is the same along the length of the channel 4, while the elevation angles of the helical projections 7 of the die and the elevation angles of the helical projections 8 of the mandrel are opposite in sign and are not less than 45°. The total height of the helical protrusions 7, 8 in any cross section of the die 1 and the mandrel 2 does not exceed ½ of the gap width between the surfaces of the die 1 and the mandrel 2. The area of the deforming channel 4 in the annular sections orthogonal to its axis is 10-15% less than the total area of the channels of the mandrel holder 3.
EFFECT: enabling formation of long-length hollow products from discrete and plasticized materials with a non-porous, defect-free and homogeneous structure of their material in cases where their maximum cross-sectional area is equal to or greater than the cross-sectional area of the screw or plunger path of the extrusion press.
12 cl, 24 dwg
