# US 2021/0370422 A1 · Hole finishing tool and method of producing hole finished product > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0370422 A1 - Document ID: US20210370422A1 - Status: Published application - Kind: A1 - Application number: 17/239,845 - Filed: 2021-04-26 - Published: 2021-12-02 - Earliest claimed: 2020-05-27 - Assignees: Subaru Corporation - Applicants: Subaru Corporation - Inventors: Ryohei ONO; Masao Watanabe; Tatsuo Nakahata - Web page: https://patentgrep.com/patent/US20210370422A1 ## CPC - B23D 77/006: {with means for lubricating or cooling} - B23B 49/026: {Boring bushing carriers attached to the workpiece by glue, magnets, suction devices or the like} - B23D 75/005: {Hand-held or hand-operated reaming devices} - B23D 2277/02: Cutting head and shank made from two different components which are releasably or non-releasably attached to each other - B23D 2277/06: Connections between component parts - B23D 2277/60: comprising means for lubrication or cooling - B23D 2277/82: for producing a stepped bore - B23D 2277/86: comprising a thread - B23D: PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR (making toothed gears or the like B23F; cutting metal by applying heat locally B23K; arrangements for copying or controlling B23Q) - B23B: TURNING; BORING (arrangements for copying or controlling B23Q) ## Abstract According to one implementation, a hole finishing tool includes a reaming cutter and a holder. The reaming cutter has a first detaching structure. The first flow path for ejecting cutting oil is formed inside the reaming cutter. The holder has a second detaching structure. The second detaching structure is detached from and attached to the first detaching structure. The second flow path for supplying the cutting oil to the first flow path is formed inside the holder. The holder has a shank. The shank is held by a tool rotating device. The holder has a sliding portion. The sliding portion has no back taper. The sliding portion is inserted into a positioning bush and slid inside the positioning bush. The sliding portion has a concave portion for storing lubrication oil. ## Claims ### Claim 1 A hole finishing tool comprising: a reaming cutter having a first detaching structure in a back end side of the hole finishing tool, a first flow path for ejecting cutting oil being formed inside the reaming cutter, the first detaching structure including a first screw or coupler; and a holder having a second detaching structure in a tip side of the hole finishing tool, the second detaching structure being detached from and attached to the first detaching structure, a second flow path for supplying the cutting oil to the first flow path being formed inside the holder, the holder having a shank in the back end side of the hole finishing tool, the shank being held by a tool rotating device having a motor, the second detaching structure including a second screw or coupler, wherein the holder has a slider in the tip side of the hole finishing tool, the slider having no back taper, the slider being inserted into a positioning bush and slid inside the positioning bush, the slider having a concave for storing lubrication oil. ### Claim 2 A hole finishing tool comprising: a reaming cutter having a first detaching structure in a back end side of the hole finishing tool, a first flow path for ejecting cutting oil being formed inside the reaming cutter, the first detaching structure including a first screw or coupler; a holder having a second detaching structure in a tip side of the hole finishing tool, the second detaching structure being detached from and attached to the first detaching structure, a second flow path for supplying the cutting oil to the first flow path being formed inside the holder, the holder having a shank in the back end side of the hole finishing tool, the shank being held by a tool rotating device having a motor, the holder having a slider in the tip side of the hole finishing tool, the slider having no back taper, the second detaching structure including a second screw or coupler; and a positioning bush for inserting and sliding the slider, wherein at least one of an outer surface of the slider and an inner surface of the positioning bush has a concave for storing lubrication oil. ### Claim 3 (depends on 1) The hole finishing tool according to claim 1, wherein the slider has a discharge port for discharging a part of the cutting oil flowing through the second flow path, the part of the cutting oil being used as the lubrication oil for reducing friction between the positioning bush and the slider. ### Claim 4 (depends on 1) The hole finishing tool according to claim 1, wherein the reaming cutter is stepped and has diameters different from each other. ### Claim 5 (depends on 1) The hole finishing tool according to claim 1, wherein the concave includes a groove continuous in a length direction of the holder. ### Claim 6 (depends on 1) The hole finishing tool according to claim 1, wherein the concave includes a groove of which length direction is a length direction of the holder. ### Claim 7 (depends on 1) The hole finishing tool according to claim 1, wherein the reaming cutter has a maximum diameter larger than a diameter of the slider. ### Claim 8 (depends on 1) A method of producing a hole finished product comprising: producing the hole finished product using the hole finishing tool according to claim 1. ### Claim 9 (depends on 8) The method according to claim 8, wherein the tool rotating device is handheld, and the hole finishing tool is hold by the handheld tool rotating device. ### Claim 10 (depends on 8) The method according to claim 8, wherein a finished hole is formed by finishing a prepared hole of which central axis is not parallel to a central axis of the finished hole. ### Claim 11 (depends on 2) The hole finishing tool according to claim 2, wherein the slider has a discharge port for discharging a part of the cutting oil flowing through the second flow path, the part of the cutting oil being used as the lubrication oil for reducing friction between the positioning bush and the slider. ### Claim 12 (depends on 2) The hole finishing tool according to claim 2, wherein the reaming cutter is stepped and has diameters different from each other. ### Claim 13 (depends on 2) The hole finishing tool according to claim 2, wherein the concave includes a groove continuous in a length direction of the holder. ### Claim 14 (depends on 2) The hole finishing tool according to claim 2, wherein the concave includes a groove of which length direction is a length direction of the holder. ### Claim 15 (depends on 2) The hole finishing tool according to claim 2, wherein the reaming cutter has a maximum diameter larger than a diameter of the slider. ### Claim 16 (depends on 2) A method of producing a hole finished product comprising: producing the hole finished product using the hole finishing tool according to claim 2. ### Claim 17 (depends on 16) The method according to claim 16, wherein the tool rotating device is handheld, and the hole finishing tool is hold by the handheld tool rotating device. ### Claim 18 (depends on 16) The method according to claim 16, wherein a finished hole is formed by finishing a prepared hole of which central axis is not parallel to a central axis of the finished hole. ### Claim 19 (depends on 4) The hole finishing tool according to claim 4, wherein the concave includes a groove continuous in a length direction of the holder. ### Claim 20 (depends on 5) The hole finishing tool according to claim 5, wherein the reaming cutter has a maximum diameter larger than a diameter of the slider.