Blade
A blade in which coolant can be efficiently supplied to a machining place with a reduced pressure loss is provided. In a blade 100 in which a cutting insert 13 is attached to an insert attachment portion 12 provided at a longitudinal end part of a blade body 11 formed in a long plate shape, the blade body 11 includes a supply inlet 51 opened at one side surface, a lower discharge port 53 and an upper discharge port 54 that are opened at an end face nearby the insert attachment portion 12 , a lower coolant supply path 55 connecting the supply inlet 51 to the lower discharge port 53 , and an upper coolant supply path 56 connecting the supply inlet 51 to the upper discharge port 54 , and the lower coolant supply path 55 and the upper coolant supply path 56 each have a curved shape in a side view.
1 . A blade in which a cutting insert is attached to an insert attachment portion provided at a longitudinal end part of a blade body formed in a long plate shape, wherein
the blade body includes
a supply inlet opened at one side surface,
a plurality of discharge ports opened at an end face nearby the insert attachment portion, and
a plurality of coolant supply paths connecting the supply inlet to the plurality of discharge ports, and
the coolant supply paths each have a curved shape in a side view,
wherein the coolant supply paths each have a cross-sectional area that gradually decreases from the supply inlet toward a corresponding one of the discharge ports.
2 . The blade according to claim 1 , wherein the insert attachment portion is made of a slit having a plurality of support surfaces that sandwich and support the cutting insert to be fitted, and
a distance from each of the coolant supply paths to a rear end part of the slit in a direction orthogonal to long sides of the blade body is longer than a distance from the coolant supply path to a corresponding one of the support surfaces.
3 . The blade according to claim 1 , wherein a sectional shape of each of the coolant supply paths on a side closer to a corresponding one of the discharge ports is an elliptical shape or long hole shape that is long in a plane direction of the blade body, and a cross-sectional area of the coolant supply path on the side closer to the discharge port is smaller than a cross-sectional area of the coolant supply path on a side closer to the supply inlet.
4 . The blade according to claim 1 , wherein the blade body includes a chamber in which coolant supplied to the supply inlet is accumulated at a bifurcation place where the plurality of coolant supply paths are bifurcated from the supply inlet.
5 . A blade in which a cutting insert is attached to an insert attachment portion provided at a longitudinal end part of a blade body formed in a long plate shape, wherein
the blade body includes
a supply inlet opened at one side surface,
a plurality of discharge ports opened at an end face nearby the insert attachment portion, and
a plurality of coolant supply paths connecting the supply inlet to the plurality of discharge ports, and
the coolant supply paths each have a curved shape in a side view,
wherein the blade body includes a chamber in which coolant supplied to the supply inlet is accumulated at a bifurcation place where the plurality of coolant supply paths are bifurcated from the supply inlet, and
a fillet portion having a circular arc shape in a sectional view is formed at a place where the chamber is connected to the coolant supply paths.
6 . The blade according to claim 5 , wherein the insert attachment portion is made of a slit having a plurality of support surfaces that sandwich and support the cutting insert to be fitted, and
a distance from each of the coolant supply paths to a rear end part of the slit in a direction orthogonal to long sides of the blade body is longer than a distance from the coolant supply path to a corresponding one of the support surfaces.
7 . The blade according to claim 5 , wherein a sectional shape of each of the coolant supply paths on a side closer to a corresponding one of the discharge ports is an elliptical shape or long hole shape that is long in a plane direction of the blade body, and a cross-sectional area of the coolant supply path on the side closer to the discharge port is smaller than a cross-sectional area of the coolant supply path on a side closer to the supply inlet.