US 12,358,059 B2
Cutting tool and method for machining workpiece
Hidekazu Fujita, Fujiyoshida (JP); Kouji Ono, Fujiyoshida (JP); and Hiroshi Ueno, Fujiyoshida (JP)
Assigned to MAKINO MILLING MACHINE CO., LTD., Tokyo (JP)
Appl. No. 17/904,936
Filed by MAKINO MILLING MACHINE CO., LTD., Tokyo (JP)
PCT Filed Mar. 31, 2021, PCT No. PCT/JP2021/013983
§ 371(c)(1), (2) Date Aug. 24, 2022,
PCT Pub. No. WO2021/201153, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2020-064561 (JP), filed on Mar. 31, 2020.
Prior Publication US 2023/0088133 A1, Mar. 23, 2023
Int. Cl. B23C 3/00 (2006.01); B23C 3/16 (2006.01); B23C 1/12 (2006.01); B23C 1/20 (2006.01); B23C 3/18 (2006.01); B23C 5/00 (2006.01); B23C 5/10 (2006.01)
CPC B23C 3/16 (2013.01) [B23C 1/12 (2013.01); B23C 1/20 (2013.01); B23C 3/18 (2013.01); B23C 5/003 (2013.01); B23C 5/10 (2013.01); B23C 2210/0407 (2013.01); B23C 2220/04 (2013.01); B23C 2250/16 (2013.01); B23C 2270/18 (2013.01); Y10T 29/49325 (2015.01); Y10T 409/303808 (2015.01); Y10T 409/304424 (2015.01)] 3 Claims
OG exemplary drawing
 
1. A machining method for machining a hole formed in a workpiece, comprising the steps of:
(i) preparing a tool comprising a shaft-shaped tool body having a first end which extends along a central axis and which is for attachment to a spindle of a machine tool, and a second end on a side opposite the first end, and a tip connected to the second end of the shaft-shaped tool body, the tip having a plurality of blade parts in the circumferential direction,
(ii) attaching the tool to a spindle of a machine tool,
(iii) arranging the tool relative to an aperture of the hole formed in the workpiece at a tilt angle, which represents an angle between a movement direction of the tool and the central axis of the tool, of 120 to 240° when viewed in a direction of a line perpendicular to a surface to be machined,
(iv) moving the tool along an inner surface of the hole from the aperture of the hole toward the interior thereof to machine the inner surface,
(v) returning the tool from the interior of the hole toward the aperture in a state in which the tool is separated from the inner surface of the hole, and
(vi) moving the tool along a peripheral edge of the aperture of the hole at a predetermined pick feed, wherein
steps (iii) to (vi) are repeated multiple times.