JP7372116B2 - Cutting tools - Google Patents

Description

The present invention relates to a cutting tool, and particularly to a cutting tool having a plurality of grooves formed therein.

Conventionally, a cutting tool in which a plurality of grooves are formed has been disclosed (for example, see Patent Document 1).

Patent Document 1 described above describes a cutting tool in which a cutting edge is formed on a ridgeline where a rake face and a flank face intersect. In the cutting tool described in Patent Document 1, regularly arranged undulations (a plurality of grooves) are formed on the cutting edge side of the rake face. In the cutting tool described in Patent Document 1, the rake face has an undulating shape that serves as an oil pool for the cutting fluid, so that when cutting the workpiece, there is a gap between the rake face and chips. Frictional resistance is reduced and the progress of wear on the rake face is suppressed.

JP2009-202283A

However, in the cutting tool described in Patent Document 1, although the progression of wear on the rake face is suppressed by forming a plurality of grooves on the rake face, wear on surfaces other than the rake face (for example, the flank face) has not been considered. Therefore, in the cutting tool described in Patent Document 1, even if the wear on the rake face has not progressed, if the wear on the flank face progresses, the tool needs to be replaced. For this reason, the cutting tool described in Patent Document 1 has a problem in that the tool life is shortened due to the progression of flank wear.

This invention was made to solve the above-mentioned problems, and one purpose of the invention is to suppress the decline in tool life by suppressing the progress of wear on both the rake face and flank face. The purpose of the present invention is to provide a cutting tool that can

In order to achieve the above object, a cutting tool according to one aspect of the present invention includes a cutting edge for cutting a workpiece and a portion where chips generated by cutting the workpiece with the cutting blade come into contact. and a flank surface including a portion that contacts the cut surface of the workpiece, and the cutting edge side of the rake face has a plurality of first grooves connecting the plurality of first grooves. A connecting groove is formed, a plurality of second grooves are formed on the cutting edge side of the flank, and the connecting groove is formed at least at the end of the plurality of first grooves on the cutting edge side. The parts are connected to each other or the ends opposite to the cutting edge are connected to each other, and the cutting edge is formed into a U-shaped curved shape that widens in the direction away from the tip of the cutting edge.

In the cutting tool according to one aspect of the present invention, as described above, the plurality of first grooves and the connecting groove connecting the plurality of first grooves are formed on the cutting edge side of the rake face, and the flank surface A plurality of second grooves are formed on the cutting edge side, and the connecting groove is formed at least between the ends of the plurality of first grooves on the cutting edge side, or on the side opposite to the cutting edge. The ends of the cutting edge are connected to each other, and the cutting edge is formed into a U-shaped curved shape that spreads away from the tip of the cutting edge . As a result, when cutting the workpiece, the plurality of first grooves reduce the frictional resistance between the rake face and chips, suppressing the progress of wear on the rake face, and The second groove reduces the frictional resistance between the flank face and the surface to be cut, and can suppress the progress of wear on the flank face. As a result, by suppressing the progress of wear on both the rake face and the flank face, it is possible to suppress a decrease in tool life.

In the cutting tool according to the above aspect, preferably, each of the plurality of first grooves is formed in the rake face so as to extend in a direction intersecting a direction in which chips are discharged. With this configuration, compared to the case where the plurality of first grooves are formed so as to extend in the direction in which chips are discharged on the rake face, the discharged chips can be disposed in the plurality of first grooves. Since it becomes difficult for cutting fluid to accumulate in the first grooves, it is possible to suppress a decrease in the amount of cutting fluid that can be stored in the plurality of first grooves. As a result, the cutting fluid is easily maintained in the region of the rake face where the plurality of first grooves are formed, so that the progress of wear on the rake face can be effectively suppressed.

In this case, preferably, each of the plurality of first grooves is formed on the rake surface so as to extend along a direction substantially perpendicular to the direction in which chips are discharged. With this configuration, the discharged chips are surely prevented from accumulating in the plurality of first grooves, and therefore, the amount of cutting fluid that can be stored in the plurality of first grooves is surely suppressed from decreasing. can do.

In the cutting tool according to the above aspect, preferably, each of the plurality of second grooves is formed in the flank surface so as to extend along the cutting direction of the workpiece by the cutting edge. With this configuration, the direction in which the plurality of second grooves extend is unlikely to be in a direction different from the direction in which the cutting fluid is supplied (generally, cutting is often carried out from behind in the cutting direction, diagonally backward, etc.) Therefore, the cutting fluid supplied to the region of the flank where the plurality of second grooves are formed can easily reach the vicinity of the cutting edge via the plurality of second grooves.

In the cutting tool according to the first aspect, preferably, the rake face is provided with a chip processing section for bending chips in a direction opposite to the rake face, and a plurality of first grooves are formed. The first groove forming region is formed so as not to overlap the chip processing section on the rake face. With this configuration, it is possible to suppress the structure of the first groove forming area from becoming more complicated than when the first groove forming area and the chip processing section are formed so as to overlap. can.

In this case, preferably, the chip processing section is provided at the center of the rake face in a direction perpendicular to the direction in which chips are discharged, and the first groove forming region is arranged so as to surround the chip processing section. It is formed in a U-shape. With this configuration, the first groove forming region can be easily formed on the rake surface so as not to overlap the chip processing section.

In the cutting tool according to the first aspect, preferably, the first groove forming region in which the plurality of first grooves are formed is formed so as to extend from the cutting edge side toward the side opposite to the cutting edge on the rake face. has been done. With this configuration, on the rake face, the first groove forming area extends toward the opposite side of the cutting edge, so that in the first groove forming area, the part that is not in contact with chips (cutting fluid is not applied). supplyable parts) can be easily produced. As a result, the cutting fluid can be easily supplied to the plurality of first grooves compared to a case where the first groove forming region does not extend toward the opposite side from the cutting edge.

In the cutting tool according to the first aspect, preferably each of the plurality of second grooves has a groove depth smaller than the groove width. With this configuration, the depth of the second groove becomes relatively shallow, so the shape of the second groove formed on the flank surface is transferred to the cut surface of the workpiece that comes into contact with the flank surface. can be suppressed.

In the cutting tool according to the above aspect, preferably, each of the plurality of second grooves is formed in the flank surface so as to extend from the cutting edge side to the vicinity of the end opposite to the cutting edge. With this configuration, the region in which the plurality of second grooves are formed becomes relatively large on the flank surface, so it is possible to easily supply the cutting fluid to the second grooves.
In the cutting tool according to the first aspect, preferably, the plurality of first grooves are formed on the cutting edge side of the rake face so as to extend along a direction perpendicular to the direction in which chips are discharged. The connecting groove is formed to be inclined with respect to the direction in which chips are discharged and the direction in which the first groove extends.

According to the present invention, as described above, by suppressing the progression of wear on both the rake face and the flank face, it is possible to suppress a decrease in tool life.

FIG. 1 is a perspective view of a cutting tool according to an embodiment of the invention. FIG. 2 is an enlarged perspective view of portion P in FIG. 1; FIG. 3 is a diagram for explaining contact between a cutting tool and a workpiece when cutting the workpiece. FIG. 3 is a view of FIG. 2 viewed from direction A. 5 is a cross-sectional view taken along line 1100-1100 in FIG. 4. FIG. FIG. 3 is a view of FIG. 2 viewed from direction B. 7 is a cross-sectional view taken along line 1200-1200 in FIG. 6. FIG. It is a figure which showed the 1st groove formation area by the 1st modification of one Embodiment of this invention. It is a figure which showed the 1st groove formation area by the 2nd modification of one Embodiment of this invention. It is a figure which showed the 1st groove formation area by the 3rd modification of one Embodiment of this invention. It is a figure which showed the 1st groove formation area by the 4th modification of one Embodiment of this invention. It is a figure which showed the 2nd groove formation area by the 5th modification of one Embodiment of this invention. It is a figure showing the 2nd groove formation field by the 6th modification of one embodiment of the present invention. It is a figure which showed the 2nd groove formation area by the 7th modification of one Embodiment of this invention. It is a figure which showed the 1st groove formation area by the 8th modification of one Embodiment of this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described based on the drawings.

The configuration of a cutting tool 100 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7. The cutting tool 100 is a tool for cutting a workpiece 1 (see FIG. 3) such as metal.

As shown in FIG. 1, the cutting tool 100 is a cutting edge (chip) of an indexable tool. An attachment hole 11 is provided in the center of the cutting tool 100 for attaching the cutting tool 100, which is a cutting edge, to a tool body (not shown).

The cutting tool 100 has a parallelepiped shape including two bottom surfaces arranged parallel to each other and having a rhombic shape, and four side surfaces connecting the two bottom surfaces. In the following description, the direction in which the longer diagonal of the bottom extends, the direction in which the shorter diagonal of the bottom extends, and the direction in which the side surfaces extend are referred to as the X direction, Y direction, and Z direction, respectively. One side in the X direction, the other side in the X direction, one side in the Y direction, the other side in the Y direction, one side in the Z direction, and the other side in the Z direction are respectively X1 side, X2 side, Y1 side, The Y2 side, the Z1 side, and the Z2 side.

In the cutting tool 100, a plurality of parallelepiped-shaped vertices (top portions 12) can be used as cutting edges 20 (described later) for cutting the workpiece 1 (see FIG. 3). In this specification, the workpiece 1 is cut using the apex (top portion 12a) on one side in the X direction (X1 side) and one side in the Z direction (Z1 side) of the cutting tool 100 having a parallelepiped shape. An example will be explained below. In this case, the cutting direction of the workpiece 1 (see FIG. 3) is the Z1 direction.

As shown in FIG. 2, the cutting tool 100 includes a cutting edge 20, a rake face 30, and a flank face 40.

The cutting edge 20 is formed at the ridgeline where the rake face 30 and the flank face 40 intersect. As shown in FIG. 3, the cutting edge 20 has a round shape. The cutting edge 20 is configured to bite into the workpiece 1 when cutting the workpiece 1 .

The rake face 30 is a surface including a portion 31 with which chips 2 generated when the workpiece 1 is cut by the cutting edge 20 come into contact. The rake face 30 is formed along the direction in which chips 2 are discharged (X2 direction) when cutting the workpiece 1. Note that when cutting the workpiece 1 using the cutting tool 100, cutting fluid is supplied to the rake face 30 from the side opposite to the cutting edge 20 (X2 side).

As shown in FIG. 2, the rake face 30 is provided with a chip processing section 32. The chip processing section 32 is formed to protrude from the rake surface 30. The chip processing section 32 is provided at a central portion 30a (see FIG. 4) of the rake face 30 in a direction (Y direction) orthogonal to the direction in which the chips 2 are discharged (X2 direction). As shown in FIG. 3, the chip processing section 32 is provided to bend the chips 2 discharged in the X2 direction to the side opposite to the rake face 30 (Z1 side). Note that in FIG. 3, illustration of the chip processing section 32 is omitted.

The flank surface 40 is a surface including a portion 41 that comes into contact with the cut surface 1a of the workpiece 1 when cutting the workpiece 1. The flank surface 40 is formed along the cut surface 1a when cutting the cut object 1. That is, the flank surface 40 and the cut surface 1a are formed along the Z direction. Note that when cutting the workpiece 1 using the cutting tool 100, cutting fluid is supplied to the flank surface 40 from the side opposite to the cutting edge 20 (Z2 side).

Here, in this embodiment, as shown in FIG. 2, a plurality of first grooves 51a are formed on the cutting edge 20 side of the rake face 30. The first groove forming region 50 in which the plurality of first grooves 51a are formed extends from the cutting edge 20 side (X1 side) to the side opposite to the cutting edge 20 (X2 side) on the rake face 30. It is formed. Note that, as shown in FIG. 3, the first groove forming region 50 is cut so that when cutting the workpiece 1 with the cutting tool 100, there is a portion that does not come into contact with the chips 2 of the workpiece 1 at all. It is formed to extend on the side opposite to the blade 20 (X2 side).

Specifically, as shown in FIG. 4, a first groove forming region 50 is formed on the rake face 30 along the cutting edge 20. Further, the first groove forming region 50 is formed in a U-shape so as to surround the chip processing section 32 . That is, the first groove forming region 50 is formed on the rake surface 30 so as not to overlap the chip processing section 32 .

Further, as shown in FIG. 5, each of the plurality of first grooves 51a is at least larger than the hard particles 3a generated between the rake face 30 and the chips 2 when the workpiece 1 is cut. It has a groove width W1 and a groove depth D1. Further, each of the plurality of first grooves 51a has a curved peak portion and a valley portion. The "hard particles 3a generated between the rake face 30 and the chips 2" refer to the fragments of the workpiece 1 that have fallen off from the chips 2 when the workpiece 1 is cut, and the hard particles 3a that are generated between the rake face 30 and the chips 2. These include pieces of the cutting tool 100 that have been torn off.

Furthermore, a coating 53 is applied to the surface of the base material 52 in the first groove forming region 50 in which the plurality of first grooves 51a are formed. The base material 52 is, for example, cermet or cemented carbide. Furthermore, the coating 53 is made of, for example, a titanium compound (titanium carbide, titanium carbonitride, etc.), alumina, or the like.

Moreover, as shown in FIG. 4, the plurality of first grooves 51a are arranged adjacent to each other. Each of the plurality of first grooves 51a is formed on the rake surface 30 so as to extend along a direction (Y direction) substantially perpendicular to the direction in which chips 2 are discharged (X2 direction). That is, each of the plurality of first grooves 51a is formed on the rake face 30 so as to extend in a direction intersecting the direction in which the chips 2 are discharged (a direction different from the direction in which the chips 2 are discharged). .

In addition, in the cutting tool 100, a connection groove 51b is formed in the first groove forming region 50 to connect the plurality of first grooves 51a to each other. Specifically, the plurality of first grooves 51a are connected to each other by a connecting groove 51b arranged at the outer edge 50a of the first groove forming region 50 formed in a U-shape. Specifically, the plurality of first grooves 51a are connected to each other by a circumferential connecting groove 51b formed so as to extend along the outer edge 50a so as to surround the first groove forming region 50.

Moreover, in this embodiment, as shown in FIG. 2, a plurality of second grooves 61 are formed on the cutting edge 20 side of the flank 40. The second groove forming region 60 in which the plurality of second grooves 61 are formed extends from the cutting edge 20 side (Z1 side) toward the side opposite to the cutting edge 20 (Z2 side) on the flank surface 40. ing.

Specifically, as shown in FIG. 6, the plurality of second grooves 61 are each formed in the flank surface 40 so as to extend along the cutting direction (Z direction) of the workpiece 1 by the cutting edge 20. There is. The plurality of second grooves 61 are each formed in the flank 40 so as to extend from the cutting edge 20 side (Z1 side) to the vicinity of the end 40a on the opposite side to the cutting edge 20 (Z2 side). There is. That is, in the cutting tool 100, the plurality of second grooves 61 extend from the vicinity of the top portion 12 on one side (Z1 side) in the Z direction to the vicinity of the top portion 12 on the other side (Z2 side) in the flank surface 40. It is formed. As a result, as shown in FIG. 3, in the second groove forming region 60, there is a portion that does not come into contact with the cut surface 1a of the workpiece 1 at all when the workpiece 1 is cut by the cutting tool 100.

Further, as shown in FIG. 7, each of the plurality of second grooves 61 is at least larger than the hard particles 3b generated between the flank surface 40 and the cut surface 1a when the cut object 1 is cut. It has a groove width W2 and a groove depth D2. Further, each of the plurality of second grooves 61 has a groove depth D2 smaller than the groove width W2. Further, each of the plurality of second grooves 61 has a curved peak portion. Note that "hard particles 3b generated between the flank surface 40 and the cut surface 1a" refer to fragments of the cut object 1 peeled off from the cut surface 1a when the cut object 1 is cut; A piece of the cutting tool 100 peeled off from the flank 40, etc.

Furthermore, a coating 63 is applied to the surface of the base material 62 in the second groove forming region 60 in which the plurality of second grooves 61 are formed. The base material 62 is, for example, cermet or cemented carbide. Further, the coating 63 is made of, for example, a titanium compound (titanium carbide, titanium carbonitride, etc.), alumina, or the like.

Note that the first groove forming area 50 (the plurality of first grooves 51a, the connecting grooves 51b) and the second groove forming area 60 (the plurality of second grooves 61) are formed by mold processing, laser processing, etc. .

(Effects of embodiment)
In this embodiment, the following effects can be obtained.

In this embodiment, as described above, a plurality of first grooves 51a are formed on the cutting edge 20 side of the rake face 30. Furthermore, a plurality of second grooves 61 are formed on the flank surface 40 on the cutting edge 20 side. As a result, when cutting the workpiece 1, the frictional resistance between the rake face 30 and the chips 2 is reduced by the plurality of first grooves 51a, and the progression of wear on the rake face 30 can be suppressed. At the same time, the plurality of second grooves 61 reduce the frictional resistance between the flank surface 40 and the cut surface 1a, and the progression of wear of the flank surface 40 can be suppressed. As a result, by suppressing the progression of wear on both the rake face 30 and the flank face 40, it is possible to suppress a decrease in tool life.

Further, in this embodiment, as described above, the plurality of first grooves 51a are each formed in the rake face 30 so as to extend in a direction intersecting the direction in which the chips 2 are discharged (X2 direction). As a result, compared to the case where the plurality of first grooves 51a are formed on the rake face 30 so as to extend in the direction in which the chips 2 are discharged, the discharged chips 2 can be disposed in the plurality of first grooves 51a. Since it becomes difficult for the cutting fluid to accumulate in the first grooves 51a, it is possible to suppress a decrease in the amount of cutting fluid that can be stored in the plurality of first grooves 51a. As a result, the cutting fluid is easily maintained in the area of the rake face 30 where the plurality of first grooves 51a are formed (the first groove forming area 50), so the progress of wear on the rake face 30 is effectively suppressed. be able to.

Further, in this embodiment, as described above, the plurality of first grooves 51a are formed on the rake face 30 along the direction (Y direction) that is substantially orthogonal to the direction in which chips 2 are discharged (X2 direction). Form it so that it extends. This ensures that the discharged chips 2 are difficult to accumulate in the plurality of first grooves 51a, thereby reliably suppressing a decrease in the amount of cutting fluid that can be stored in the plurality of first grooves 51a. be able to.

Further, in this embodiment, as described above, the plurality of second grooves 61 are formed in the flank surface 40 so as to extend along the cutting direction (X2 direction) of the workpiece 1 by the cutting edge 20. . This makes it difficult for the direction in which the plurality of second grooves 61 to extend to be different from the direction in which the cutting fluid is supplied. The cutting fluid supplied to the forming region 60) can be easily made to reach the vicinity of the cutting edge 20 via the plurality of second grooves 61.

Further, in this embodiment, as described above, each of the plurality of first grooves 51a is formed by at least the hard particles 3a generated between the rake face 30 and the chips 2 when the workpiece 1 is cut. It is configured to have a groove width W1 and a groove depth D1 larger than the groove width W1 and the groove depth D1. Thereby, the hard particles 3a generated between the rake face 30 and the chips 2 can easily enter the first groove 51a without remaining outside the first groove 51a. As a result, the hard particles 3a are less likely to dig (scrape) the rake face 30, so the hard particles 3a generated between the rake face 30 and the chips 2 do not enter the first groove 51a and are Compared to the case where it remains outside the groove 51a, accelerated wear of the rake face 30 can be suppressed.

Further, in this embodiment, as described above, the chip processing section 32 for bending the chips 2 toward the opposite side of the rake surface 30 is provided on the rake surface 30. Then, the first groove forming region 50 in which the plurality of first grooves 51a are formed is formed on the rake face 30 so as not to overlap with the chip processing section 32. Thereby, the structure of the first groove forming area 50 can be suppressed from becoming complicated compared to the case where the first groove forming area 50 and the chip processing section 32 are formed to overlap. .

Further, in this embodiment, as described above, the chip processing section 32 is provided in the center portion 30a of the rake face 30 in the direction (Y direction) orthogonal to the direction in which the chips 2 are discharged (X2 direction). . Then, the first groove forming region 50 is formed in a U-shape so as to surround the chip processing section 32 . Thereby, the first groove forming region 50 can be easily formed on the rake face 30 so as not to overlap with the chip processing section 32 .

Further, in this embodiment, as described above, the first groove forming region 50 in which the plurality of first grooves 51a are formed is moved from the cutting edge 20 side to the opposite side of the cutting edge 20 on the rake face 30. Formed so as to extend toward the As a result, on the rake face 30, the first groove forming area 50 extends toward the side opposite to the cutting edge 20, so in the first groove forming area 50, the part that is not in contact with the chips 2 (cutting oil can be easily produced. As a result, compared to the case where the first groove forming region 50 does not extend toward the side opposite to the cutting edge 20, the cutting fluid can be easily supplied to the plurality of first grooves 51a.

Further, in this embodiment, as described above, each of the plurality of second grooves 61 is formed by at least the hard particles 3b generated between the flank surface 40 and the cut surface 1a when the cut object 1 is cut. It is configured to have a groove width W2 and a groove depth D2 larger than that of the groove width W2 and the groove depth D2. Thereby, the hard particles 3b generated between the flank surface 40 and the cut surface 1a can easily enter the second groove 61 without remaining outside the second groove 61. As a result, the hard particles 3b are less likely to dig (scrape) the flank surface 40, so that the hard particles 3b generated between the flank surface 40 and the surface to be cut 1a do not enter the second groove 61. Compared to the case where it remains outside the two grooves 61, accelerated wear of the flank 40 can be suppressed.

Further, in this embodiment, as described above, each of the plurality of second grooves 61 is configured to have a groove depth D2 smaller than the groove width W2. As a result, the depth of the second groove 61 becomes relatively shallow, so that the shape of the second groove 61 formed in the flank surface 40 is transferred to the cut surface 1a of the workpiece 1 that comes into contact with the flank surface 40. It is possible to prevent this from happening.

Further, in this embodiment, as described above, the plurality of second grooves 61 are each formed in the flank surface 40 so as to extend from the cutting edge 20 side to the vicinity of the end 40a on the opposite side to the cutting edge 20. do. As a result, the region in which the plurality of second grooves 61 are formed becomes relatively large on the flank surface 40, so that the cutting fluid can be easily supplied to the second grooves 61.

[Modified example]
The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the description of the above embodiments, and further includes all changes (modifications) within the meaning and scope equivalent to the claims.

For example, in the above embodiment, the plurality of first grooves 51a are connected to each other by a circumferential connecting groove 51b formed so as to extend along the outer edge 50a so as to surround the first groove forming region 50. Although shown, the present invention is not limited thereto. In the present invention, like the cutting tool 200 of the first modification shown in FIG. Alternatively, they may be connected to each other by a non-circumferential connecting groove 251b. In addition, in FIG. 8, the connecting groove 251b is provided on the entire outer edge 250a of the first groove forming area 250 on the cutting edge 20 side, but the connecting groove 251b is provided on the entire outer edge 250a of the first groove forming area 250 on the cutting edge 20 side. It may be provided in a part, or it may be provided on the side opposite to the cutting edge 20 side of the outer edge 250a of the first groove forming region 250.

Further, in the embodiment described above, the plurality of first grooves 51a are each formed on the rake surface 30 so as to extend along a direction (Y direction) substantially orthogonal to the direction in which chips 2 are discharged (X2 direction). Although an example has been shown, the present invention is not limited to this example. In the present invention, as in a cutting tool 300 of a second modification shown in FIG. It may also be formed to extend obliquely with respect to the direction (Y direction).

Further, in the above embodiment, an example was shown in which the plurality of first grooves 51a were connected to each other by the connecting groove 51b arranged on the outer edge 50a of the first groove forming region 50, but the present invention is not limited to this. do not have. In the present invention, as in a cutting tool 400 of a third modified example shown in FIG. It's okay.

Further, in the embodiment described above, an example was shown in which the first groove forming region 50 was formed in a U-shape so as to surround the chip processing section 32, but the present invention is not limited to this. In the present invention, as in a cutting tool 500 of a fourth modification shown in FIG. It may be formed into a shape.

In the embodiment described above, each of the plurality of second grooves 61 extends from the cutting edge 20 side (Z1 side) to the vicinity of the end 40a on the side opposite to the cutting edge 20 (Z2 side) in the flank surface 40. Although an example formed in this manner is shown, the present invention is not limited to this. In the present invention, as in a cutting tool 600 of a fifth modification example shown in FIG. It may be formed into

Furthermore, in the above embodiment, an example is shown in which the plurality of second grooves 61 are each formed in the flank surface 40 so as to extend along the cutting direction (Z direction) of the workpiece 1 by the cutting edge 20. However, the present invention is not limited thereto. In the present invention, as in a cutting tool 700 of a sixth modification shown in FIG. It may also be formed so as to extend at an angle with respect to the base.

Further, in the embodiment described above, an example was shown in which the connection groove 51b that connects the plurality of first grooves 51a to each other is formed in the first groove formation region 50, but the present invention is not limited to this. In the present invention, a connection groove 861b that connects a plurality of second grooves 861 to each other may be formed in the second groove forming region 860, as in a cutting tool 800 of a seventh modification shown in FIG. Moreover, like the cutting tool 900 of the 8th modification shown in FIG. 15, it may be comprised so that the connection groove 51b which mutually connects the several 1st groove|channel 51a may not be formed.

Further, in the above embodiment, an example of the cutting tool 100 having a parallelepiped shape is shown, but the present invention is not limited to this. In the present invention, the shape of the cutting tool may be other than a parallelepiped shape as long as it has an apex (top) that can be used as a cutting edge.

Further, in the above embodiment, an example of the cutting tool 100 as a cutting edge (chip) of an indexable tool attached to a tool body is shown, but the present invention is not limited to this. The present invention may be applied to a cutting tool in which a tool body and a cutting edge (chip) are integrally formed.

1 Workpiece 1a Cutting surface (of the workpiece) 2 Chips 3a Hard particles (generated between the rake face and chips when the workpiece is cut) 3b (The workpiece is cut) 20 Cutting edge 30 Rake face 30a Central part (of the rake face) in the direction perpendicular to the direction in which chips are discharged 31 Chips (of the rake face) 32 Chip processing section 40 Flank surface 40a (Flank surface) End opposite to the cutting edge 41 (Flank surface) Portion that contacts the cut surface of the workpiece 50, 250, 450, 550 First groove forming area 51a, 351a First groove 60 Second groove forming area 61, 661, 761, 861 Second groove 100, 200, 300, 400, 500, 600, 700, 800, 900 Cutting tool D1 (No. (1st groove) groove depth D2 (2nd groove) groove depth W1 (1st groove) groove width W2 (2nd groove) groove width

Claims (10)

A cutting edge for cutting the workpiece,
a rake face including a portion in contact with chips generated when the workpiece is cut by the cutting edge;
a flank surface including a portion that comes into contact with the cut surface of the cut object,
A plurality of first grooves and a connection groove connecting the plurality of first grooves are formed on the cutting edge side of the rake face,
A plurality of second grooves are formed on the cutting edge side of the flank,
The connection groove connects at least the ends on the cutting edge side or the ends on the opposite side to the cutting edge among the ends of the plurality of first grooves, and connects the ends of the plurality of first grooves to each other, and A cutting tool that is formed into a U-shaped curve that expands in the direction of distance . The cutting tool according to claim 1, wherein each of the plurality of first grooves is formed in the rake face so as to extend in a direction intersecting a direction in which the chips are discharged. The cutting tool according to claim 2, wherein each of the plurality of first grooves is formed in the rake face so as to extend along a direction substantially perpendicular to a direction in which the chips are discharged. The plurality of second grooves are each formed in the flank surface so as to extend along the cutting direction of the workpiece by the cutting edge. Cutting tools. The rake face is provided with a chip processing section for bending the chips in a direction opposite to the rake face,
According to any one of claims 1 to 4 , the first groove forming region in which the plurality of first grooves are formed is formed so as not to overlap the chip processing section on the rake face. Cutting tools listed. The chip processing section is provided at a central portion of the rake face in a direction perpendicular to a direction in which the chips are discharged,
The cutting tool according to claim 5 , wherein the first groove forming region is formed in a U-shape so as to surround the chip processing section. The first groove forming region in which the plurality of first grooves are formed is formed on the rake face so as to extend from the cutting edge side toward the opposite side to the cutting edge. 6. The cutting tool according to any one of 6 . The cutting tool according to any one of claims 1 to 7 , wherein each of the plurality of second grooves has a groove depth smaller than a groove width. 9. The plurality of second grooves are each formed in the flank surface so as to extend from the cutting edge side to near an end on the opposite side to the cutting edge . Cutting tools as described in Section. The plurality of first grooves are formed on the cutting edge side of the rake face so as to extend along a direction perpendicular to the direction in which the chips are discharged,
The cutting tool according to claim 1, wherein the connection groove is formed to be inclined with respect to a direction in which the chips are discharged and a direction in which the first groove extends.

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