FEMALE SCREW MACHINING TOOL

PROBLEM TO BE SOLVED: To provide a female screw machining tool capable of reducing a cutting load by discharging chips and swarf more smoothly than the conventional one through a chip discharge groove and preventing positional deviation of the center of a female screw.SOLUTION: A female screw machining tool 100 comprises: a prepared hole machining part 10 which is provided at a tool tip end part 101 and forms a prepared hole on a machining object; a screw machining part 20 which is provided more on a tool base end part side from the prepared hole machining part 10 and forms a female screw in the prepared hole; and a chip discharge groove 50 spirally extending from a tip end part of the prepared hole machining part 10 toward the tool base end part. The prepared hole machining part 10 comprises a chip discharge pocket 12 adjacent to a tip end of the chip discharge groove 50.SELECTED DRAWING: Figure 3 【課題】切りくずや切粉を従来よりも円滑に切粉排出溝を通して排出することで、切削負荷を軽減することができ、雌ねじの中心の位置ずれを防止することができる雌ねじ加工工具を提供する。【解決手段】工具先端部１０１に設けられ加工対象に対して下穴を形成する下穴加工部１０と、該下穴加工部１０よりも工具基端部側に設けられ下穴に雌ねじを形成するねじ加工部２０と、下穴加工部１０の先端部から工具基端部へ向けて螺旋状に延びる切粉排出溝５０と、を備えた雌ねじ加工工具１００である。下穴加工部１０は、切粉排出溝５０の先端に隣接する切粉排出ポケット１２を備える。【選択図】図３