Drawing spinneret

Abstract

A drawing spinneret including at least one drawing core provided with a centered through-opening in the axial direction with a shaping neck where at least an inflow portion with a truncated cone shape forming part of the centered through-opening converges. The drawing core is immobilized on a support structure. The support structure includes a first front frame and a second rear frame coupled to each other in such a way that they can be disassembled by screwing. The assembly of the two frames defines an inner space where at least the drawing core is housed such that it is held in an undetachable manner both in the axial direction and in the radial direction.

1 - 12 . (canceled) 
     
     
         13 . A drawing spinneret, which comprises at least one drawing core that is made up of a centered through-opening in an axial direction with a shaping neck where at least one inlet portion with a truncated-cone shape forming part of the centered through-opening converges, the drawing core being immobilized on a support structure; 
       wherein:
 the support structure comprises a first front frame ( 3 ) and a second rear frame ( 2 ) coupled to each other in such a way that they can be disassembled by screwing, the assembly of the two frames defining an inner space where at least one drawing core ( 1 ) is housed such that it is held in an undetachable manner both in axial direction and in radial direction; 
 the front frame ( 3 ) comprises a tubular configuration that features a head ( 10 ) and a tubular extension ( 11 ) that defines a cylindrical hole wherein at least one drawing core ( 1 ) is adjusted and which is axially retained in both directions, and is also radially retained; 
 the rear frame ( 4 ) comprises a bowl-shaped structure, whose bottom ( 8 ) contains in its center a through-perforation ( 9 ) for the exit of a rod ( 24 ) to be drawn, whereas the inner lateral side ( 7 ) of the rear frame ( 4 ) comprises a truncated-cone configuration onto which the outer truncated-cone surface of the tubular extension ( 11 ) is complementary supported, said tubular extension ( 11 ) being part of the front frame; 
 the wall of the tubular extension ( 11 ) of the front frame ( 3 ) comprises several longitudinal slots ( 13 ); 
 
       wherein the coupling of both frames ( 3  and  4 ) creates a radial tightening at least on the drawing core ( 1 ) by contacting the truncated-cone surfaces of both frames ( 3 ,  4 ); 
       and wherein the coupling of the two frames ( 3  and  4 ) generates an axial tightening wherein a rear end ( 17 ) of the drawing core ( 1 ) acts as stop against the bottom ( 8 ) of the rear frame ( 4 ). 
     
     
         14 . A drawing spinneret, according to  claim 13 , wherein the head ( 10 ) of the front frame ( 3 ) features an inlet ( 19 ) that converges inwards, as a lubricating means for the rod ( 24 ) to be drawn, wherein said inlet ( 19 ) is part of the inner hole of the tubular structure of the front frame ( 3 ). 
     
     
         15 . A drawing spinneret, according to  claim 13 , wherein the longitudinal slots ( 13 ) end in several widened perforations ( 13 ). 
     
     
         16 . A drawing spinneret, according to  claim 13 , wherein the front frame ( 3 ) comprises a peripheral step ( 16 ) for axial retention integrated in the head ( 10 ) of the front frame ( 3 ), located at the junction of the head ( 10 ) and tubular extension ( 11 ) of the front frame ( 3 ). 
     
     
         17 . A drawing spinneret, according to  claim 13 , wherein the centered through-opening of the drawing core ( 1 ) comprises an inlet portion ( 27 ) converging inwards, an outlet portion ( 28 ) diverging outwards and the shaping neck ( 29 ) where both portions ( 27 ) and ( 28 ) converge. 
     
     
         18 . A drawing spinneret, according to  claim 13 , wherein the through-perforation ( 9 ) of the bottom of the rear frame ( 4 ) comprises a configuration diverging outwards. 
     
     
         19 . A drawing spinneret, according to  claim 13 , wherein the male threading ( 5 ) is integrated in the head ( 10 ) of the front frame ( 3 ), whereas the female threading ( 6 ) is located in an area adjacent to the mouth of the rear frame ( 4 ) which features a bowl-shaped configuration. 
     
     
         20 . A drawing spinneret, according to  claim 13 , wherein the front frame ( 3 ) and the rear frame ( 4 ) have, respectively, outer terminal portions ( 20 ) and ( 26 ), with a section other than circular as a means for assembling and disassembling both frames ( 3 - 4 ). 
     
     
         21 . A drawing spinneret, according to  claim 13 , wherein:
 it also comprises a pressure core ( 2 ) housed and adjusted also inside the cylindrical hole of the tubular extension ( 11 ) forming part of the front frame ( 3 ), where an end of the drawing core ( 1 ) and an end of the pressure core ( 2 ) are in contact with each other;   the pressure core ( 1 ) comprises a central through-opening in axial direction that comprises an inlet portion ( 21 ) converging inwards and an outlet portion ( 22 ) diverging outwards, both portions defining a passage neck ( 23 ) of greater diameter than the initial diameter of the rod to be drawn ( 24   a ) and of the drawn rod ( 24 );   in the junction area of the drawing core ( 1 ) and the pressure core ( 2 ), a lubricant pressure chamber ( 30 ) is defined, made up by the outlet portion ( 22 ) of the pressure core ( 2 ) and by the converging inlet portion ( 26 ) of the drawing core ( 1 ), where both portions converge.   
     
     
         22 . A drawing spinneret, according to  claim 16 , wherein a front end ( 15 ) of the pressure core ( 2 ) acts as an axial stop against the peripheral step ( 16 ) of the front frame ( 3 ). 
     
     
         23 . A drawing spinneret, according to  claim 16 , wherein a front end ( 18 ) of the drawing core ( 1 ) acts as an axial stop against the peripheral step of the front frame ( 3 ). 
     
     
         24 . A drawing spinneret, according to  claim 13 , wherein the rear frame ( 4 ) comprises an outer truncated-cone surface ( 25 ).