# US 8,769,800 B2 · Process for making conical spare parts for refiners for the production of paper > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,769,800 B2 - Document ID: US8769800B2 - Status: Granted - Kind: B2 - Application number: 12/276,217 - Filed: 2008-11-21 - Published: 2009-05-28 - Granted: 2014-07-08 - Earliest claimed: 2007-11-23 - Assignees: Officine Airaghi S.R.L. - Applicants: Luca Ghibellini - Inventors: Luca Ghibellini - Web page: https://patentgrep.com/patent/US8769800B2 ## CPC - D21D 1/22: Jordans - Y10T 29/49996: Successive distinct removal operations - D21D: TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A process for making spare parts for refiners used for producing paper, in particular for making refiners for preparing paper pulps, where the pulp enters at one end and exits on the other side, passing through a rotary body or rotor or male component equipped with bars (or grooves) and a casing or stator or female component bearing fixed counter-bars. This process includes mechanical machining of unmachined sectors; routing or mechanical machining of the machined sectors to obtain a set of bars or grooves or holes; putting together the cone (rotor or stator by joining all of the sectors to the supporting flanges; mechanical machining (turning and grinding) to finish the cone; and balancing of the rotor or stator. ## Claims ### Claim 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. ### Claim 2 (depends on 1) A process according to claim 1, wherein said sectors are obtained from a plasma or laser cut sheet metal. ### Claim 3 (depends on 1) A process according to claim 1, wherein said sectors are obtained through casting. ### Claim 4 (depends on 1) A process according to claim 1 wherein the thickness of said bars is less than 1 mm. ### Claim 5 (depends on 1) A process according to claim 1, wherein the thickness of said bars is 1 mm or more. ### Claim 6 (depends on 1) A process according to claim 1 wherein the finished conical shape is a frusto-conical shape with a taper tending towards 90° or a semi-flat truncated-cone shape with a taper tending towards zero. ### Claim 7 (depends on 1) A process according to claim 1 wherein the sectors are developed without a welding step. ### Claim 8 (depends on 1) A process according to claim 1 wherein the routing or mechanical machining is a milling operation. ### Claim 9 A process for making a stator for a refiners used for preparing paper pulps, where the pulp enters at one end and exits at another end of said refiner, passing through a rotor equipped with bars and a stator bearing fixed counter-bars, whereby both said rotor and said stator are constituted by a series of metal sectors placed adjacent to each other, said process comprising the following series of 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 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 stator having a conical shape; d) fixing the adjacent sectors to each other and to said flanges in order to obtain said stator 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 stator to obtain a finished conical shape; and f) balancing said stator. ### Claim 10 (depends on 9) A process according to claim 9, wherein said sectors are obtained from a plasma or laser cut sheet metal. ### Claim 11 (depends on 9) A process according to claim 9, wherein said sectors are obtained through casting. ### Claim 12 (depends on 9) A process according to claim 9, wherein said sectors are obtained through casting. ### Claim 13 (depends on 9) A process according to claim 9 wherein the thickness of said bars is less than 1 mm. ### Claim 14 (depends on 9) A process according to claim 9 wherein the finished conical shape is a frusto-conical shape with a taper tending towards 90° or a semi-flat truncated-cone shape with a taper tending towards zero. ### Claim 15 (depends on 9) A process according to claim 9 wherein the sectors are developed without a welding step. ### Claim 16 (depends on 9) A process according to claim 9 wherein the routing or mechanical machining is a milling operation. ### Claim 17 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 a 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 consisting of 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 by milling 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 a 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. ### Claim 18 (depends on 17) A process according to claim 17 wherein the sectors are developed without a welding step.