Method for extruding plasticized powdered materials (variants) and device for implementing same (variants)

Method for extruding plasticized powdered materials, comprising pressing a starting blank from said material and forcing the same along the extrusion axis through a deformation channel having several variable cross-section portions, while the material forced through each portion of the deformation channel is submitted to oppositely signed cyclic drawing up, shearing and torsion deformations and to two oppositely signed cyclic setting deformations directed orthogonally to the extrusion axis and acting in antiphase, the maximal increments of one of these setting deformations being assigned to the material in a plane passing through the extrusion axis, and the second of these deformations at the inlet and the outlet of the deformation channel being orthogonal to said plane, the directions of the maximal increments of said setting during the procedure of forcing the material through each portion of the deformation channel being changed by their turning about the channel axis according to any smooth periodic function the period of which is equal to the length of the respective portion of the deformation channel, and the amplitude is equal to 15-75°, while doing it, at each following portion of the deformation channel, the plane in which the first of these deformations has the maximal increments is turned about a similar plane of the previous portion about the extrusion axis at 30-90°.

Device for extruding plasticized powdered materials, comprising an extruder, a deformation element with a working channel provided with several coaxially located profiled portions, and a forming die, the surface of each of the profiled portions of the working channel being made as two couples of wave-like surfaces acting in antiphase, symmetric with respect to the working channel axis and smoothly passing one into the other;

• for one couple of these surfaces, the maximal increments of the distances from the channel surface to the axis thereof being located in a plane passing through the axis of said channel, and for the other couple, such maximal increments being located in the profiled surface the generatrices of which are orthogonal to the axis of the channel along the entire length of the same and are orthogonal to said plane at the inlet and the outlet of each profiled portion, the turning angle of these generatrices about the axis being described by a smooth periodic function with the amplitude 15-75°, and the profiled portions of the working channel being located in a way that the plane in which the first couple of wave-like surfaces has the maximal increments of the distances from the channel surface to the axis thereof and is turned, at each following portion of the deformation channel, about the deformation channel axis at 30-90° with respect to a similar plane of the previous portion.