Dorn to produce hot with periodic taper LONG HOLLOW METAL IN THREE OR THREE + N Pilger Cleto

摘要

1. Dorn for the production of hot-rolled with a periodic taper elongated hollow metal articles in 3 or 3 + n pilger roll stands, consisting of a working portion and disposed between the locking shank them consisting of 3-tapered portions with different conicity and with the end portion put on it a ring arbor defining the length of this portion and having an inner surface, the shape and size identical to the end portion of the outer surface of the shank of the mandrel, characterized in that the working part of the mandrel Submitted and 3 or 3 + n periodic tapered portions connected together by two or n-1 conical transitions lot length 50 to 100 mm, larger values ​​of which are disposed between the tapered portions diametrov.2 large. Dorn for the production of hot-rolled with a periodic taper elongated hollow metal articles according to claim 1, characterized in that the difference between the diameters of the tapered end portions Δsostavlyaet from 2.0 to 4.0 mm, larger values ​​which relate to tapered portions more diametra.3. Dorn for the production of hot-rolled with a periodic taper elongated hollow metal articles according to claim 1, characterized in that the difference between the diameters of the conical transition between the tapered portions of Δopredelyaetsya vyrazheniyaΔ = dd = DD, where the minimum outer diameter d- i-th section of the conical hollow elongated metal , mm; outer diameter dmaksimalny i + 1 of the conical portion of the hollow elongated metal product, mm; D- ideal pilger roll caliber diameter in i-th pilger stand, mm; D- ideal diameter mp caliber pilger rolls i + 1