Tool of machine tool
View Patent ↗A tool of a machine tool includes a tool body 8 in which there are formed: first suction holes 8 d opened near cutting edges 9 and extending toward an axis P of a shaft portion 8 a ; and a second suction hole 8 e to which the first suction holes 8 d join and which extends in an axial direction of a spindle 7 and communicates with a chip discharge hole 7 a of the spindle 7.
1. A tool of a machine tool comprising:
a tool body, the tool body comprising: a shaft portion attachably/detachably loaded to a spindle of the machine tool via a tool holder; a holding portion provided with a plurality of cutting edges; and a suction hole serving as a suction passage of chips during suction of the chips by a chip suction device,
wherein the plurality of cutting edges are disposed along a peripheral edge of the holding portion of the tool body and are fixed to the holding portion by bolts inserted from underneath; in the holding portion, a plurality of concave portions are formed along the peripheral edge of the holding portion so as to be situated on a front side of the cutting edges, in terms of a cutting direction, the concave portions are open downward and covers are provided so as to cover the openings of the concave portions from underneath, the covers are formed as separate bodies, and gaps between the covers and the cutting edges which communicates with the concave portions,
wherein the suction hole includes: a plurality of first suction passageways communicating with the concave portions and extending obliquely upward toward an axis of the shaft portion; and a second suction passageway which is partially formed in an axial core of the tool body so as to extend in a direction of the axis of the shaft portion and to which the plurality of first suction passageways join, and
wherein each of the plurality of first suction passageways includes an end abutting corresponding one of the concave portions, and
wherein the end is arranged to overlap at least partially with corresponding one of the gaps, when viewed from a bottom of the tool.
2. The tool of the machine tool according to claim 1 , wherein
a total passage area of the first suction passageways is set equal to or less than a passage area of the second suction passageway.
3. The tool of the machine tool according to claim 1 , wherein
the covers are detachably fixed to the rims of the openings of the concave portions by bolts inserted from underneath.
4. The tool of the machine tool according to claim 1 , wherein
the end is visible from the gap in a direction perpendicular to corresponding one of the covers and corresponding one of the gaps.
5. The tool of the machine tool according to claim 1 , wherein
the plurality of first suction passageways are offset from the plurality of cutting edges.
6. The tool of the machine tool according to claim 1 , wherein each one of the covers has a plate shape, and is configured at the bottom of the tool.
7. The tool of the machine tool according to claim 6 , wherein the cutting edges are configured to cut a workpiece on a cutting plane, and each one of the covers extends parallel to the cutting plane.