| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique capable of accurately jetting coolant to a machining portion when grinding an inner peripheral surface of a workpiece by a grindstone with a simple configuration, for example.SOLUTION: A machine tool includes: a rotary shaft; and a tool holder which is detachably engaged with the rotary shaft and is formed with a supply hole of grinding liquid therein. The machine performs inner periphery grinding of a workpiece by a grindstone rotated by the rotary shaft while being held by the tool holder. The tool holder includes a main supply hole formed in an axial center section and a plurality of branch supply holes formed by being obliquely branched in a peripheral surface direction of the grindstone from the main supply hole, and blowouts grinding liquid to the peripheral surface direction of the grindstone from the plurality of branch supply holes.SELECTED DRAWING: Figure 5 |
