KR101118464B1 - Cutting tool, machine tool, and processing method - Google Patents

Abstract

The cutting tool has a blade portion 2 at the tip side in the axial direction and a shank 3 at the base end. The blade portion 2 has a blade groove 4 formed on the outer circumferential surface and an outer circumferential blade 5 formed along the blade groove 4. The blade groove 4 and the outer blade 5 are twisted in the opposite direction to the cutting rotational direction seen from the shank 3 side. The blade groove 4 has a groove width that increases toward the tip side, and guides the cutting chip cut by the outer peripheral blade 5 to the tip side. Therefore, the cutting chips are only extruded to the axial tip side, and are not scattered, thereby improving the working environment. Since the torsion direction and the cutting rotation direction of the outer peripheral blade 5 are formed opposite to each other, the force which pushes back the cutting tool itself to the holding | maintenance side by cutting force generate | occur | produces, and the rigidity of a tool improves.

Cutting tool, machine tool, shank, peripheral edge, end cutting edge

Description

Cutting tools, machine tools and machining methods {CUTTING TOOL, MACHINE TOOL, AND PROCESSING METHOD}

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a cutting tool, a machine tool having the same, and a machining method, specifically, a cutting tool having a blade portion at the tip end side in the axial direction and a shank at the base end side in the axial direction, wherein the blade portion is a torsion formed on the outer circumferential surface thereof. A cutting tool having a groove (blade groove) and an outer circumferential blade formed along the blade groove, a machine tool having the same, and a machining method.

Conventionally, an end mill is formed as a cutting tool in which a torsion groove (blade groove) is formed on an outer circumferential surface and an outer circumference blade is formed along this groove. There is also a machine tool provided with such a cutting tool.

In such an end mill, in order to smoothly discharge the cutting chip which arises by cutting, it is known that the shape of the blade groove of a cross section of a perpendicular direction forms a continuous concave curve on the outer peripheral blade, and the blade groove is wide. (See, eg, Document 1: Japanese Patent Application Laid-Open No. 2000-52127). Specifically, the cross-sectional shape of the blade groove has a smooth U-shape from the inclined surface to the flank of the blade bottom and adjacent outer peripheral blades.

In the end mill described in Document 1, the blade grooves are formed in a U-shaped cross section, so that the dischargeability of the cutting chips immediately after being cut by the outer peripheral blades is improved, but the cutting chips are guided to the shank side along the blade grooves. When we reached shank, there was problem to scatter around.

In general, in an end mill having a torsional edge (outer circumferential edge), the outer circumferential edge is formed to be twisted in the same direction as the cutting rotation direction when viewed from the shank side. Thereby, the cutting chip is guided to the shank side along the blade groove. However, like the end mill described in the document 1, since the blade groove is not formed in the shank, the cutting chip guided to the shank side is scattered in the normal direction at the end of the blade groove.

An object of the present invention is to provide a cutting tool, a machine tool and a processing method which can prevent the scattering of the cutting chip to improve the working environment, and also secure the rigidity to the cutting force.

The cutting tool of the present invention is a cutting tool having a blade portion at the distal end side in the axial direction and a shank at the proximal end side in the axial direction, wherein the blade portion has a blade groove formed on an outer circumferential surface and an outer peripheral blade formed along the blade groove. The blade groove and the outer edge are twisted in the opposite direction with respect to the cutting rotation direction seen from the shank side, and the blade groove has a groove width that increases toward the tip end side and is cut by the outer edge. It characterized in that to guide to the tip side.

According to this structure, since the blade groove and the outer peripheral blade are formed twisted in the opposite direction to the cutting rotation direction seen from the shank side, the cutting chips cut by the outer peripheral blade are extruded to the tip side by the inner surface of the blade groove.

As in the conventional cutting tool, when the blade groove and the outer peripheral blade are formed twisted in the same direction as the cutting rotation direction, the cutting chip is guided to the shank side. However, since the shank is not provided with the blade groove and the outer circumferential blade, the cutting chip guided to the shank side along the blade groove is displaced in the radial direction with respect to the rotation axis when it reaches the shank.

On the other hand, in the present invention, the cutting chips guided to the tip side are just extruded in parallel in the direction of the rotation axis as they are, and do not fly in the radial direction with respect to the rotation axis as in the prior art. In addition, since the width of the blade groove is increased toward the tip side, the cutting chip is guided smoothly inside the blade groove, and clogging of the blade groove by the cutting chip is unlikely to occur. In this way, the cutting chips do not scatter around, and the working environment can be improved.

Here, for example, when the cutting rotation direction is a right turn, the blade groove and the outer edge are formed to the left twist, and when the cutting rotation direction is the left turn, the blade groove and the outer edge are formed to the right twist. In addition, in the text, the right twisted one is arranged and the left twisted one is appropriately referred to as an inverted lead.

Further, since the torsional direction and the cutting rotation direction of the outer peripheral blades are formed to be opposite to each other, a force that pushes the cutting tool itself toward the main shaft side (the holding tool side of the cutting tool) is generated by the cutting force. Therefore, there is no fear that the cutting tool will fall out of the holder. In addition, since the load in the thrust direction in which the cutting tool is drawn out from the main shaft becomes small, the rigidity of the tool is improved. Therefore, even if the width of the blade groove is formed to be larger toward the tip side, the rigidity of the tool tip portion with respect to the cutting force can be ensured.

The cutting tool of the present invention is a cutting tool having a blade portion at the distal end side in the axial direction and a shank at the proximal end side in the axial direction, wherein the blade portion has a blade groove formed on an outer circumferential surface and an outer peripheral blade formed along the blade groove. The blade groove and the outer blade are twisted in the opposite direction to the cutting rotation direction seen from the shank side, and the blade groove deepens toward the tip side and simultaneously cuts the cutting chip cut by the outer blade to the tip side. It is characterized by guiding.

According to this configuration, approximately the same effects as those described above are obtained. That is, the cutting chip guided to the tip side is just extruded in the direction of the rotational axis as it is, and does not scatter in the radial direction with respect to the rotational axis as in the prior art. In addition, since the depth dimension of the blade groove is large toward the tip side, the cutting chip is guided smoothly inside the blade groove, so that clogging of the blade groove by the cutting chip is unlikely to occur. In this way, the cutting chips do not scatter to the surroundings, and the working environment is improved.

Further, since the cutting rotation direction and the torsional direction of the outer circumferential blade are formed to be opposite to each other, the load in the thrust direction in which the cutting tool is to be drawn out from the main shaft is reduced, and the rigidity of the tool is improved. Therefore, even if the depth dimension of the blade groove is formed to be larger toward the tip side, the rigidity of the tip portion can be ensured.

In the cutting tool of the present invention, an end cutting edge that is continuous to the outer circumferential edge is formed at the tip of the blade portion, and an inclined surface of the end cutting edge is formed continuously on the inclined surface of the outer circumference blade at the tip side of the blade groove, It is preferable that the recessed end pocket is formed in the opposite side to the inclined surface of the said cutting edge with respect to the said cutting edge.

According to this structure, since the concave end pocket corresponding to each end cutting edge is formed in the front-end | tip part of an end mill, the cutting chip guide | induced to the front end side by the edge groove smoothly axially from the front-end | tip part by the end pocket. It is discharged and the discharge property of a cutting chip is improved.

In addition, as described above, since the cutting rotation direction and the torsional direction of the outer circumferential blade are formed to be opposite to each other, even if the end pocket is formed at the tip portion, the rigidity of the tip portion can be ensured.

In the cutting tool of the present invention, the blade groove has a first blade groove formed over the neighboring outer peripheral blades and a groove width smaller than the groove width of the first blade groove, and on the inner side surface of the first blade groove. It is preferable to comprise the 2nd blade groove formed.

According to this configuration, the cutting chip is guided to the tip side by the first blade groove, and the coolant or the like is guided to the tip side by the second blade groove. Therefore, a flow path such as cutting liquid can be secured by the second blade groove.

The machine tool of this invention is equipped with the said cutting tool, It is characterized by the above-mentioned.

With such a machine tool, the same effects as described above can be obtained, the scattering of cutting chips can be prevented, the working environment can be improved, and the rigidity with respect to the cutting force can be ensured.

The machining method of the present invention includes a blade portion at the tip end side in the axial direction and a shank at the base end side in the axial direction, wherein the blade portion has a blade groove formed on an outer circumferential surface and an outer peripheral blade formed along the blade groove. The outer circumferential edge is formed to be twisted in the opposite direction with respect to the cutting rotation direction seen from the shank side, and the blade groove has a groove width that increases toward the tip side, and the cutting chip cut by the outer circumferential edge is formed at the tip end. It is a processing method using the cutting tool which guides to the side, It is characterized by discharging the said cutting chip from the front end side of the said cutting tool.

Here, as a cutting tool used for the machining method of the present invention, a cutting tool in which the blade groove is deepened toward the tip side may be used.

According to the present invention, the same effects as described above can be obtained, the scattering of the cutting chips can be prevented, the working environment can be improved, and the rigidity with respect to the cutting force of the cutting tool to be used can be ensured.

According to the present invention, it is possible to provide a cutting tool, a machine tool and a machining method which can prevent the scattering of the cutting chip to improve the working environment, and also secure the rigidity against the cutting force.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on drawing.

In addition, after 2nd Embodiment mentioned later, the same code | symbol is attached | subjected to the structural member similar to the structural member in 1st Embodiment demonstrated below, and the same function, and description is abbreviate | omitted or abbreviate | omitted.

[First Embodiment]

1 is a partial outline view of an end mill 1 of two blades as a cutting tool of the present embodiment.

The end mill 1 has a blade portion 2 formed at the distal end side of the substantially cylindrical substrate, and a shank 3 provided at the base end side in the axial direction, and is viewed from the shank 3 side. When the workpiece is rotated in the right direction around the axis, the workpiece is cut.

The blade portion 2 comprises a pair of blade grooves 4 (4A, 4B) formed on the outer circumferential surface, a pair of outer edge blades 5 (5A, 5B) formed along the blade groove 4, and this outer blade. It has a pair of linear cutting edges 6 (6A, 6B) which are continuous to (5) and formed at the end of an axial direction.

The blade groove 4 and the outer edge 5 are twisted in the opposite direction (left rotation direction) with respect to the cutting rotation direction (right rotation direction in this embodiment) seen from the shank 3 side. So-called left twist.

The inclined surface 7 of the outer circumferential blade 5 constituted by the blade groove 4 is provided to scoop up and remove the cutting chip by the outer circumferential blade 5, and is formed at the tip side with respect to the outer circumferential blade 5. do. Moreover, the flank 8 of the outer peripheral blade 5 is provided in order to avoid interference with a workpiece | work, and is formed in the shank 3 side with respect to the outer peripheral blade 5. In other words, the outer circumferential blade 5 is formed at the intersection of the inclined surface 7 and the flank 8.

In Fig. 1, the blade groove 4B is the inclined surfaces 7 and 7B of the outer peripheral blade 5B, the groove bottom continuous to the inclined surface 7B, and the flank 8A of the outer peripheral blade 5A adjacent from the groove bottom. It is formed with the gentle inclined surface 9 (9B) which reaches (), and comprises what is called a chip pocket which is the discharge space of a cutting chip. The blade grooves 4 and 4A are similarly configured.

In the tip portion of the end mill 1, concave end pockets 10 (10A, 10B) corresponding to the respective cutting edges 6A, 6B are formed. The inclined surface 7 of the outer circumferential blade 5 is provided continuously at the inclined surface 11 of the end cutting edge 6 at the end portion on the axial end side. The end pocket 10 is formed in the rear surface opposite to the inclined surface 11 of the cutting edge 6 with respect to the cutting edge 6. For example, the first end pocket 10A (part shown by broken lines) corresponding to the first end cutting edge 6A continuous to one outer peripheral edge 5A in FIG. 1 is the first end cutting edge 6A. Is formed on the side opposite to the inclined surface 11A. Moreover, the 2nd end pocket 10B (part shown by hatching) corresponding to the 2nd end cutting edge 6B continuous to the other outer peripheral edge 5B has the inclined surface 11B of the 2nd end cutting edge 6B. It is formed on the opposite side to).

Next, the groove width of the blade groove 4 will be described based on FIG. 2.

FIG. 2 is a cross-sectional view schematically showing the pitch of the outer circumferential blade 5 of the end mill 1 of FIG. 1. This cross-sectional view is a view cut in a plane passing through the central axis of the end mill 1, but for the sake of explanation, the shape of the blade groove 4 is simplified and the difference between the shapes of the neighboring blade grooves 4A and 4B is exaggerated. do.

The lead L _F of the front surface (corresponding to the inclined surface 7 of FIG. 1) of the outer circumferential blades 5 (5A, 5B) is set to the dimension A. FIG. On the other hand, the lead L _R of the back surface (corresponding to the inclined surface 9 in FIG. 1) of the outer circumferential edges 5 (5A, 5B) is set to a dimension B larger than the dimension A. FIG. In this way, the outer circumferential blade 5 has a multi lead. As a result, the width (groove width) along the axial direction of the blade groove 4 is changed in the same way as the lead difference B-A between the front lead L _F and the rear lead L _R. Towards large.

The processing method using the end mill 1 as described above will be described based on FIG. 3. FIG. 3 is a view of a state in which the workpiece W is side-cut by using the end mill 1 as viewed from the direction in which the end mill 1 is transported.

First, the shank 3 of the end mill 1 is fixed to the main shaft of a machine tool not shown. Then, by rotating the main shaft, the end mill 1 is moved in a direction orthogonal to the axial direction while the end mill 1 is turned right with respect to the axis center, and the outer circumferential blade 5 of the end mill 1 is moved. It makes contact with the workpiece | work W. In this way, the workpiece W is cut by the outer circumferential edge 5. Here, since the blade groove 4 and the outer circumferential blade 5 are formed with the left twist, the cutting chip of the workpiece W cut by the right circumferential outer circumferential blade 5 is tipped by the inner surface of the blade groove 4. Extruded to the side. That is, the blade groove 4 guides the cutting chip cut by the outer peripheral blade 5 to the tip side along the blade groove 4 as indicated by the arrow in the figure, and discharges the cutting chip from the tip portion in the axial direction. do.

Since the concave end pocket 10 corresponding to each end cutting edge 6 is formed in the tip portion of the end mill 1, the cutting chip guided to the tip side by the blade groove 4 is the end pocket 10. ) Is smoothly discharged from the distal end in the axial direction.

Moreover, a machine tool is a horizontal boring machine, for example, and is equipped with the holding part which hold | maintains at least an end mill, and the rotating part which rotates the held end mill.

[Effect of this embodiment]

According to this embodiment, the following effects can be exhibited.

(1) Since the blade groove 4 is formed to the left side twist, the cutting chip guided to the front end side is just extruded in parallel in the direction of the rotation axis as it is, and does not fly in the radial direction with respect to the rotation axis as in the prior art. In addition, since the width of the blade groove 4 is large toward the tip side, the cutting chip is guided smoothly inside the blade groove 4, so that clogging of the blade groove 4 by the cutting chip is unlikely to occur. In this way, the cutting chips do not scatter around, and the working environment can be improved.

(2) Since the torsion direction and the cutting rotation direction of the outer circumferential edge 5 are formed opposite to each other, a force for pushing the end mill 1 itself to the main shaft side (holding side) by the cutting force is generated. Therefore, there is no fear that the end mill 1 will fall out of the holding tool. In addition, since the load in the thrust direction in which the end mill 1 is drawn out from the main shaft becomes small, the rigidity of the end mill 1 is improved. Therefore, even if the width | variety of the blade groove 4 is formed so that it may become large toward a front end side, the rigidity of the tool tip part with respect to a cutting force can be ensured.

(3) Since the concave end pocket 10 corresponding to each end cutting edge 6 is formed in the tip portion of the end mill 1, the cutting chip guided to the tip side by the blade groove 4 is The end pocket 10 smoothly discharges from the distal end portion in the axial direction, thereby improving the ejection property of the cutting chip.

Second Embodiment

Next, 1 A of end mills which concerns on 2nd Embodiment of this invention are demonstrated based on FIG. 4A.

4: A is cross-sectional view which shows typically the pitch of the outer peripheral edge of 1A of end mills.

The end mill 1A is different from the end mill 1 of the first embodiment described above in that the setting of the rear lid L _R and the setting of the depth dimension of the blade groove are different, and the other configurations are substantially the same. .

That is, both the lead L _{R on the} back and the lead L _{F on the} front face are set equal in the dimension A to form the blade grooves 4 (4A, 4B) having a constant groove width. Moreover, the depth dimension of the blade groove 4 is set so that it may become deep with a constant gradient toward the axial tip side. That is, the blade grooves 4A and 4B are so-called tapered grooves having a groove bottom formed on the outer circumferential surface C of the imaginary cone about the axis of the end mill 1A (the surface indicated by the dashed-dotted line in the figure). . In addition, the back lid L _R and the front lid L _F are set at intervals of the dimension A toward the tip side with respect to the blade groove 4 at the end portion on the shank 3 side.

The end mill 1B as a modification of this embodiment is shown in FIG. 4B.

4B is a cross-sectional view schematically showing the pitch of the outer circumferential edge of the end mill 1B.

In the end mill 1B of FIG. 4B, the inner side surfaces of the blade grooves 4A and 4B are formed into a smooth curved surface. Each of the blade grooves 4A and 4B is a tapered groove having a groove bottom in contact with the outer circumferential surface C of the virtual cone described above.

According to this present embodiment, the following effects can be obtained.

(4) As in the above embodiment, the cutting chip guided to the tip side is just extruded in parallel in the rotation axis direction as it is, and does not fly in the radial direction with respect to the rotation axis as in the prior art. Moreover, since the depth dimension of the blade groove 4 is large toward the tip side, the cutting chip is guided smoothly inside the blade groove 4, so that clogging of the blade groove 4 by the cutting chip is unlikely to occur. In this way, the cutting chips do not scatter around, and the working environment can be improved.

(5) Since the cutting rotation direction and the torsional direction of the outer circumferential blade 5 are formed opposite to each other, the load in the thrust direction in which the end mill 1A is to be drawn out from the main shaft becomes small, thereby improving the rigidity of the end mill 1A. do. Therefore, even if the depth dimension of the blade groove 4 is formed to become large toward the tip side, the rigidity of the tool tip portion with respect to the cutting force can be ensured.

[Modification]

In addition, this invention is not limited to embodiment mentioned above, The deformation | transformation, improvement, etc. in the range which can achieve the objective of this invention are included in this invention.

For example, you may employ | adopt the end mill 1C shown in FIG. 5 as a cutting tool of this invention. FIG. 5: is a longitudinal cross-sectional view which shows the end mill 1C which concerns on the modification of this invention. Although this longitudinal cross-sectional view is the figure which cut | disconnected in the plane orthogonal to a center axis | shaft, the shape of the blade groove 4 is shown in simplified form for description.

The end mill 1C differs in that the second blade groove 22 is formed at the bottom of the groove of the blade groove 4 in the above-described embodiment, and the rest of the configuration is substantially the same. That is, in FIG. 5, the pair of blade grooves 4 of the end mill 1C has a groove width of the first blade groove 21 and the first blade groove 21 formed over the neighboring outer peripheral blades 5. It is comprised including the 2nd blade | wing groove 22 formed in the groove bottom of the 1st blade groove 21, and having a groove width smaller than. The second blade groove 22 is substantially semicircular in cross section, and is continuously formed along the twisting direction of the blade groove 4 to the tip portion in the axial direction.

According to such a structure, the cutting chip cut by the outer peripheral blade 5 is guide | induced to the front-end | tip side by the 1st blade groove 21, and the coolant etc. which are smaller in specific gravity than the cutting chip are the 1st blade groove ( 21 is guided to the tip side by the second blade groove 22 closer to the central axis. Therefore, the flow path, such as a cutting liquid, can be ensured by the 2nd edge groove 22. As shown in FIG.

In addition, in each said embodiment, although the end mill which has two twisting blades (outer edge) was demonstrated as an example, the cutting tool of this invention can be applied also to the end mill of three or more blades. In addition, the cutting tool of the present invention is not limited to an end mill, but is a cutting tool including at least the blade portion at the tip end side in the axial direction and the shank at the base end side in the axial direction, wherein the blade portion has a blade groove formed on the outer circumferential surface, and the blade. What is necessary is just the cutting tool which has the outer peripheral edge formed along the groove | channel.

Moreover, the blade part which concerns on this invention manufactured separately to the tool main body containing a shank may be joined together concentrically by soldering.

[Example]

Hereinafter, the Example and comparative example of this invention are demonstrated.

In the present Example, the end mill 1 of the following shape which is a structure substantially the same as the structure described in the said embodiment is prepared, and the side cutting by the outer peripheral blade (refer FIG. 7) is performed under the processing conditions shown below, Compared with the side cutting (refer FIG. 6) in the conventional end mill 90, the scattering prevention effect of the cutting chip was evaluated.

〔One. Shape of End Mill 1 According to the Embodiment]

(1) Diameter of blade part (tool diameter) ø8 mm

(2) Two pieces of outsourcing day

(3) lead reverse direction

(4) with multi leads

〔2. Shape of Conventional End Mill 90 of Comparative Example]

(1) Diameter of blade part (tool diameter) ø8 mm

(2) Two pieces of outsourcing day

(3) direction of lead

(4) no multi lead

[3. Processing condition]

(1) Machine Tool M Horizontal Boring Machine BTD200QH

                                   (Made by Toshiba Kikai Kabushi Kaisha)

(2) spindle speed 5,000rpm

(3) Feed speed (Z direction) 250 mm / min (X, Y direction stops)

(4) material of the workpiece (W) chemical wood

〔4. result〕

6A to 6C and FIG. 8 are schematic diagrams and photographs showing a cutting state by the conventional end mill 90. 7A to 7C and 9 are schematic diagrams and photographs showing a cutting state by the end mill 1 of the present embodiment. As shown in FIGS. 6A to 6C and 7A to 7C, from the position before the machining shown in FIGS. 6A and 7A, the end mills 1 and 90 are rotated vertically and shown in FIGS. 6C and 7C. As a result of moving to the position to make it, as is clear from the photograph of FIG. 8, FIG. 9, in the side cutting by the conventional end mill 90, the cutting chip D discharged to the shank side was scattered vigorously. On the other hand, in the side cutting by the end mill 1 of the present Example, the cutting chip D discharged to the front end side did not scatter but deposited below. Thus, as compared with the side cutting by the conventional end mill 90, in the side cutting by the end mill 1 of this embodiment, it became clear that scattering of the cutting chip D is prevented.

1 is a partial outer diameter diagram illustrating a cutting tool according to a first embodiment of the present invention.

2 is a cross-sectional view schematically showing the pitch of the outer circumferential edge of the cutting tool.

3 is a view of a cutting state of the cutting tool as seen in a feed direction;

4A is a cross sectional view showing a pitch of an outer circumferential edge of a cutting tool according to a second embodiment of the present invention.

4B is a cross sectional view showing a pitch of an outer circumferential edge of a cutting tool according to a modification of the second embodiment of the present invention.

5 is a longitudinal sectional view showing a cutting tool according to a modification of the present invention.

6A to 6C are diagrams schematically showing a cutting state by a cutting tool according to a comparative example.

7A to 7C are diagrams schematically showing a cutting state by the cutting tool according to the embodiment.

8 is a photograph showing a cutting state by a cutting tool according to a comparative example.

9 is a photograph showing a cutting state by the cutting tool according to the embodiment.

<Explanation of symbols for the main parts of the drawings>

1: end mill

2: blade

3: shank

4, 4A, 4B: Me Home

5, 5A, 5B: Outsourcing Day

6, 6A, 6B: End cutting edge

7, 7A, 7B, 11, 11A, 11B: slope

8, 8A, 8B: Plank

9, 9A, B: slope

10, 10A, 10B: End Pocket

L _F , L _R : Lead

W: Walk

Claims (9)

It is a cutting tool provided with the blade part of the tip side of an axial direction, and the shank of the base end side of an axial direction, The blade portion has a blade groove formed on the outer circumferential surface, an outer circumferential blade formed along the blade groove, and an end cutting blade formed at the tip of the blade portion continuously to the outer circumferential blade, The blade groove and the outer edge are twisted in the opposite direction from the proximal end to the distal end with respect to the cutting rotational direction seen from the shank side, The blade groove has a groove width that increases toward the tip side, and guides the cutting chip cut by the outer peripheral blade to the tip side, On the tip side of the blade groove, an inclined surface of the end cutting edge is formed continuously on the inclined surface of the outer peripheral blade, A cutting tool, wherein a concave end pocket is formed on the side opposite to the inclined surface of the cutting edge with respect to the cutting edge. It is a cutting tool provided with the blade part of the tip side of an axial direction, and the shank of the base end side of an axial direction, The blade portion has a blade groove formed on the outer circumferential surface, an outer circumferential blade formed along the blade groove, and an end cutting blade formed at the tip of the blade portion continuously to the outer circumferential blade, The blade groove and the outer edge are twisted in the opposite direction from the proximal end to the distal end with respect to the cutting rotational direction seen from the shank side, The blade groove deepens toward the tip side and simultaneously guides the cutting chip cut by the outer edge to the tip side. On the tip side of the blade groove, an inclined surface of the end cutting edge is formed continuously on the inclined surface of the outer peripheral blade, A cutting tool, wherein a concave end pocket is formed on the side opposite to the inclined surface of the cutting edge with respect to the cutting edge. delete delete The blade blade of claim 1 or 2, wherein the blade groove comprises: a first blade groove formed over the neighboring outer peripheral blades; And a second blade groove having a groove width smaller than the groove width of the first blade groove and formed on an inner side surface of the first blade groove. The machine tool provided with the cutting tool of Claim 1 or 2. The machine tool provided with the cutting tool of Claim 5. It is a processing method using the cutting tool of Claim 1 or 2, And the cutting chip is discharged from the front end side of the cutting tool. delete

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