# US 9,517,518 B2 · Method of manufacturing the thread of a nut in a screw and nut system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,517,518 B2 - Document ID: US9517518B2 - Status: Granted - Kind: B2 - Application number: 14/067,673 - Filed: 2013-10-30 - Published: 2014-05-15 - Granted: 2016-12-13 - Earliest claimed: 2012-10-30 - Assignees: Aktiebolaget Skf - Applicants: Aktiebolaget SKF - Inventors: Eric Allegri; Gilles Pajean - Web page: https://patentgrep.com/patent/US9517518B2 ## CPC - B23G 5/00: Thread-cutting tools; Die-heads - B23G 7/00: Forming thread by means of tools similar both in form and in manner of use to thread-cutting tools, but without removing any material (features of machines or devices not specially adapted to the particular mode of forming the thread B23G1/00) - B23G 7/02: Tools for this purpose - B23G 2210/04: Internal threads - B23G 2240/36: Methods of threading not otherwise provided for - B23G: THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH (making helical grooves by turning B23B5/48, by milling B23C3/32, by forging, pressing, or hammering B21K1/56, by grinding B24B19/02; arrangements for copying or controlling B23Q; thread-forming by corrugating tubes B21D15/04, by rolling B21H3/02) ## Abstract A method of manufacturing a nut in a screw and nut system comprises a first material removal stage to form an internal thread of which the value of the nominal diameter is lower than a predetermined final nominal diameter value and a second plastic deformation stage of the thread formed during the first stage to obtain the predetermined final value by material displacement. ## Claims ### Claim 1 A method of manufacturing an internal thread of a nut configured to be used in a screw-and-nut system, the method comprising: forming the internal thread in the nut with a material removal stage, a nominal diameter value of the internal thread being less than a predetermined final nominal diameter value, and after forming the internal thread, during a plastic deformation stage, displacing material of the internal thread formed during the material removal stage to obtain the predetermined final nominal diameter value, the method including forming a groove on the internal thread during the material removal stage. ### Claim 2 (depends on 1) The method according to claim 1, wherein the nominal diameter value is less than the predefined final nominal diameter value by 10 μm to 100 μm. ### Claim 3 (depends on 2) The method according to claim 2, wherein the nominal diameter value is less than the predefined final nominal diameter value by 20 μm to 50 μm. ### Claim 4 (depends on 1) The method according to claim 1, wherein displacing material of the internal thread comprises deformation tapping. ### Claim 5 (depends on 1) The method according to claim 1, wherein the groove is formed at the bottom of the internal thread. ### Claim 6 (depends on 1) The method according to claim 1, including creating a chamfer at a vertex of the internal thread during the material removal stage. ### Claim 7 A method of manufacturing an internal thread of a nut configured to be used in a screw-and-nut system, the method comprising: forming an internal thread having a nominal diameter in the nut by removing material from an inner wall of the nut, and after forming the internal thread, increasing the nominal diameter of the internal thread by plastic deformation of the internal thread without removing material from the inner wall of the nut, the method including forming a groove in a surface of the internal thread. ### Claim 8 (depends on 7) The method according to claim 7, wherein increasing the nominal diameter of the internal thread comprises increasing the nominal diameter of the internal thread by 10 μm to 100 μm. ### Claim 9 (depends on 7) The method according to claim 7, wherein increasing the nominal diameter of the internal thread comprises increasing the nominal diameter of the internal thread by 20 μm to 50 μm. ### Claim 10 (depends on 7) The method according to claim 7, wherein forming a groove in a surface of the internal thread comprises forming the groove at a bottom of the internal thread. ### Claim 11 (depends on 7) The method according to claim 7, wherein increasing the nominal diameter of the internal thread includes deforming the groove. ### Claim 12 A method of manufacturing an internal thread of a nut configured to be used in a screw-and-nut system, the method comprising: forming an internal thread having a nominal diameter in the nut by removing material from an inner wall of the nut, and after forming the internal thread, increasing the nominal diameter of the internal thread by plastic deformation of the internal thread without removing material from the inner wall of the nut, the method including forming a chamfer at a vertex of the internal thread and wherein increasing the nominal diameter of the internal thread incudes deforming the chamfer. ### Claim 13 (depends on 12) The method according to claim 12, including forming a groove in a surface of the internal thread and wherein increasing the nominal diameter of the internal thread includes deforming the groove.