Patent ID: 8769800
Filing Date: 2014-07-08
Classification: D21D,Y10T

Abstract:
1. A process for making a rotor for a refiner used for preparing paper pulps, where the pulp enters at one end and exits at another end of said refiner, passing through said rotor equipped with bars and a stator bearing fixed counter-bars, whereby both the rotor and the stator are constituted by a series of metal sectors placed adjacent to each other, said process comprising the following steps: a) mechanical machining of unmachined metal pieces to obtain said sectors, whereby each sector is machined to obtain, on a surface thereof, one or more recesses suitable for co-operating with one or more flanges, b) routing or mechanical machining of said sectors by a machine tool to obtain on a another surface thereof a set of said bars; c) assembling said sectors by placing them adjacent to each other on said flanges to obtain said rotor having a conical shape; d) fixing the adjacent sectors to each other and to said flanges in order to obtain a said rotor in which said bars are directly obtained on said another surface of each of said sectors, without any sector supporting plate; e) mechanical turning and grinding of said rotor to obtain a finished conical shape; and f) balancing said rotor.