JP6728428B1 - Cutting insert and cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting insert capable of improving chip disposability without increasing a rising angle of a protrusion in transverse feed processing. A cutting insert (1) has an upper surface (50), a front surface (52) forming an intersecting ridgeline (51) between the upper surface (50), and a side surface (54) continuous with the front surface (52) and forming an intersecting ridgeline (53) between the upper surface (50). The front cutting edge 70 is provided on the intersecting ridgeline 51 between the upper surface 50 and the front surface 52, and the horizontal cutting edge 71 is provided on the intersecting ridgeline 53 between the upper surface 50 and the side surface 54. The upper surface 50 has a protrusion 80 and a first recess 90 provided along the protrusion 80 on the side of the horizontal cutting edge 71 of the protrusion 80. [Selection diagram] Figure 1

Description

The present invention relates to a cutting insert and a cutting tool.

There is a cutting insert that performs grooving and lateral feed processing (see Patent Document 1). This type of cutting insert has a substantially rectangular parallelepiped main body, an upper surface having a protruding portion to be a chip breaker, a front surface forming an intersecting ridgeline between the upper surface, and a continuous top surface on both sides of the front surface. Front side cutting edge for grooving provided on the intersecting ridgeline between the upper surface and the front surface, and lateral feed provided on the intersecting ridge line between the upper surface and the side surface. Equipped with a horizontal cutting edge for processing.

Then, during cutting, the front cutting edge is made to face the rotating work material in the direction orthogonal to the rotation axis of the work material, the cutting insert is sent to the work material side, and grooving is performed by the front cutting edge. I do. Then, from the state in which the cutting insert has entered the work material and has been subjected to grooving, the cutting insert is fed in the direction of the rotation axis, and lateral feed is performed by the horizontal cutting edge.

Actual Kaihei 3-120303

By the way, in the transverse feed processing, it is desirable to reduce the curl diameter of the chips in order to improve the chip disposability during cutting. In particular, when the inner peripheral surface of a cylindrical work material is laterally fed, chips tend to collect inside the work material, so it is necessary to improve the chip discharge performance and reduce the curl diameter. Is desirable. Therefore, it is conceivable that the rising angle of the protrusions is increased and the chips are greatly bent when they hit the protrusions.

However, if the rising angle of the protruding portion is increased as described above, the collision load of the chips on the protruding portion increases, and the cutting insert may be damaged.

The present invention has been made in view of the above point, and provides a cutting insert and a cutting tool capable of improving the chip disposability without increasing the rising angle of the protrusion in the lateral feed processing. Is one of the purposes.

A cutting insert according to one aspect of the present invention includes an upper surface, a front surface forming an intersecting ridge line between the upper surface, a side surface continuous with the front surface, forming an intersecting ridge line between the upper surface, and an upper surface and a front surface. Front cutting edge provided on the intersecting ridge line between, and a horizontal cutting edge provided on the intersecting ridge line between the upper surface and the side surface, the upper surface, the projection-shaped portion, on the side of the horizontal cutting edge of the projection-shaped portion, A first recess provided along the protruding portion.

According to this aspect, since the upper surface has the first recessed portion along the outer edge of the protruding portion on the side of the horizontal cutting edge of the protruding portion, the chips are temporarily lowered along the surface of the first recessed portion, and It rides on the protruding part and is cut. Thereby, the curl diameter can be reduced even if the rising angle of the protrusion is small. Therefore, in the lateral feed processing, the chip disposability can be improved without increasing the rising angle of the protruding portion.

In the above aspect, even if the rising angle of the protruding portion with respect to the reference plane is 5° or more and 15° or less in the vertical cross section that is perpendicular to the reference surface that is the mounting surface for the main body of the cutting tool and that is parallel to the front cutting edge. Good.

In the above aspect, the distance from the horizontal cutting edge to the first concave portion on the upper surface may be 0.05 mm or more and 0.15 mm or less.

In the above aspect, the distance from the horizontal cutting edge to the protrusion on the upper surface may be 0.15 mm or more and 0.55 mm or less.

In the above aspect, the upper surface has a side surface upper surface outer peripheral portion that is continuous with the horizontal cutting edge and is connected to the first concave portion, and a vertical angle is provided at a connection portion between the side surface upper surface outer peripheral portion and the first concave portion. Is formed, and the interior angle of the apex angle may be 140° or more and 170° or less.

In the above aspect, the upper surface may further include a protrusion and a second recess provided along the protrusion on the front cutting edge side of the protrusion.

In the above aspect, the first recess and the second recess may be continuous.

In the above aspect, the upper surface may include a first recess and a second recess, and may have a recess provided over the entire circumference of the outer edge of the protrusion.

In the above aspect, the rising angle of the protruding portion with respect to the reference surface in a vertical cross section that is perpendicular to the reference surface that is the mounting surface for the main body of the cutting tool and that is orthogonal to the front cutting edge is -10° or more and 10° or less. May be

In the above aspect, the distance from the front cutting edge on the upper surface to the second recess may be 0.05 mm or more and 0.35 mm or less.

In the above aspect, the distance from the front cutting edge to the protrusion on the upper surface may be 0.10 mm or more and 0.45 mm or less.

In the above aspect, the upper surface has a front-side upper surface outer peripheral portion that is connected to the front cutting edge and is connected to the second recessed portion, and the connection portion between the front-side upper surface outer peripheral portion and the second recessed portion has a top surface. A corner may be formed, and the interior angle of the apex angle may be 140° or more and 170° or less.

In the above aspect, the upper surface may have a plurality of protrusions.

A cutting tool according to another aspect of the present invention includes the cutting insert.

It is a perspective view of a cutting insert. It is a top view of a cutting insert. It is a side view of a cutting insert. It is a front view of a cutting insert. It is a top view of the cutting part of a cutting insert. It is a schematic diagram for demonstrating the shape of the corner part of the cutting part of a cutting insert. It is a schematic diagram of the AA cross section of FIG. 5 of a cutting part. It is a schematic diagram of the BB cross section of FIG. 5 of a cutting part. It is a perspective view which shows a part of cutting tool. It is the figure which saw the cutting tool from the front end side. It is a schematic diagram of the cross section of the cutting part of the cutting insert attached to the main-body part of a cutting tool. It is an explanatory view for explaining a situation at the time of grooving processing. It is explanatory drawing for demonstrating the state at the time of horizontal feed processing. It is a perspective view of the cutting insert of other modes.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The same elements will be denoted by the same reference symbols, without redundant description. Further, the positional relationship such as up, down, left and right is based on the positional relationship shown in the drawings unless otherwise specified. Further, the dimensional ratios in the drawings are not limited to the illustrated ratios. The following embodiments are examples for explaining the present invention, and the present invention is not limited to these embodiments.

1 is a perspective view of a cutting insert 1 according to the present embodiment, FIG. 2 is a top view of the cutting insert 1, FIG. 3 is a side view of the cutting insert 1, and FIG. It is a front view of the insert 1. FIG. 5 is an enlarged top view of the cutting portion of the cutting insert 1.

The cutting insert 1 is suitable for grooving and transverse feed processing. As shown in FIGS. 1 and 2, the cutting insert 1 has a main body 10 and a cutting portion 11 provided at the tip of the main body 10.

The main body 10 has a substantially rectangular parallelepiped shape that is substantially square in a top view. As shown in FIGS. 1 to 3, the main body 10 has a top surface 20, a bottom surface 21 facing the top surface 20, and four side surfaces 22, 23, 24, 25 connecting the top surface 20 and the bottom surface 21. .. The bottom surface 21 has a flat mounting surface 30 that comes into contact with the main body of the cutting tool when the bottom surface 21 is attached to the main body. The main body 10 has a through hole 31 at the center thereof, which penetrates in the vertical direction. In this specification, unless otherwise specified, the configuration of the cutting insert 1 will be described with reference to the posture of the cutting insert 1 when the upper surface 20 faces upward and the mounting surface 30 of the bottom surface 21 is horizontal.

The cutting portion 11 has, for example, a substantially rectangular parallelepiped shape as shown in FIG. 1, and protrudes from the side surface 22 on the front side (front direction Y shown in FIGS. 1 to 3) of the main body portion 10 toward the front side. As shown in FIGS. 1 to 5, the cutting portion 11 is, for example, an upper surface 50, a front surface 52 that forms an intersecting ridge line 51 between the upper surface 50, and a ridge line 53 that is continuous with the upper surface 50 and that intersects with the upper surface 50. And two lower surfaces 55 facing the front surface 52. The two side surfaces 54 face each other. The upper surface 50, the front surface 52, the side surface 54, and the lower surface 55 are each formed in a substantially rectangular shape. The lower surface 55 is formed on the same plane as the mounting surface 30 of the main body 10, for example.

In the present specification, the upper surface 50 of the cutting portion 11 of the cutting insert 1 is a surface that faces upward in the above-described reference posture of the cutting insert 1, and is a surface that serves as a rake surface during grooving and lateral feed processing. The front surface 52 faces the work material during grooving and is a surface in the feed direction during grooving, and the side surface 54 is a surface in the feed direction during lateral feed processing. Further, a direction parallel to the intersecting ridgeline 51 of the front surface 52 in the top view and directed to the side surface 54 is a left-right direction X, a direction orthogonal to the left-right direction X in the top view and directed to the front surface 52 is a front direction Y, and a direction away from the front surface 52. To the rear.

The cutting portion 11 is formed symmetrically with respect to a virtual center line Q passing through the center in the left-right direction X and extending along the front direction Y in the top view of FIG. A front cutting edge 70 used for grooving is provided on an intersecting ridge line 51 between the upper surface 50 and the front surface 52. At each intersecting ridge line 53 between the upper surface 50 and the side surface 54, a horizontal cutting edge 71 used during lateral feed processing is provided. The front cutting edge 70 and the horizontal cutting edge 71 are connected to each other at a corner 72 that is convexly curved outward in a top view. As shown in FIG. 6, the radius of curvature r1 of the corner 72 is set to about 0.1 mm to 0.3 mm, for example. The front cutting edge 70 and the horizontal cutting edge 71 intersect so as to have an interior angle α1 of, for example, 85° or more and less than 90°. Further, the side surface 54 has a clearance angle α2 (back taper) of, for example, greater than 0° and less than or equal to 5° relative to the front surface 52 in a top view.

The front cutting edge 70 and the horizontal cutting edge 71 are linearly formed in a top view shown in FIG. The front cutting edge 70 is formed in a straight line when viewed from the front as shown in FIG. 4. The lateral cutting edge 71 is formed in a linear shape in a side view as shown in FIG. The horizontal cutting edge 71 is inclined so as to gradually decrease from the front cutting edge 70 toward the rear side.

As shown in FIGS. 1, 2, and 5, the upper surface 50 includes a protrusion 80 and a recess 81.

The protrusion 80 is provided, for example, in the center of the upper surface 50. The protruding portion 80 is formed, for example, in an elliptical shape that is long in the front direction Y in a top view. The protruding portion 80 has a substantially hemispherical shape that is curved upward so that the central portion is highest. FIG. 7 is a vertical cross section (AA cross section that is perpendicular to the mounting surface (reference surface) 30 of the cutting insert 1 shown in FIG. 5 and is orthogonal to the front cutting edge 70 and passes through the center of the front cutting edge 70 in the left-right direction X. ) Schematically shows a cross section of the cutting portion 11 when cut at (). As shown in FIG. 7, the rising angle β1 of the protrusion 80 with respect to the reference plane 30 in the AA cross section is set to -10° or more and 10° or less. The “reference surface 30</b>A” in FIG. 7 is obtained by moving the reference surface 30 in parallel with the height of the outer edge 80 a of the protrusion 80, and the rising angle β<b>1 of the protrusion 80 is equal to that of the protrusion 80. The angle is defined by the tangent line of the upper surface 50 at the outer edge 80a and the reference surface 30A. Here, the outer edge 80 a of the protruding portion 80 is a portion where the imaginary line C extending rearward from the front cutting edge 70 along the upper surface outer peripheral portion 100 and the upper surface 50 of the protruding portion 80 intersect. Further, the rising angle β1 has only to have a positive angle with respect to the upper surface outer peripheral portion 100, and does not necessarily have to have a positive angle with respect to the reference surface 30A.

The protrusion 80 is higher than the front cutting edge 70, for example, on the basis of the attachment surface (reference surface) 30. The height difference h between the protrusion 80 and the front cutting edge 70 is set within 0.5 mm. Further, the radius of curvature r2 of the upper surface of the protrusion 80 is set to, for example, 0.6 mm or more and 1.1 mm or less. The “reference surface 30</b>B” in FIG. 7 is obtained by moving the reference surface 30 in parallel with the height of the front cutting edge 70.

In addition, FIG. 8 is a portion which is perpendicular to the reference surface 30 of the cutting insert 1 shown in FIG. 5 and is parallel to the front cutting edge 70, and in which the protruding portion 80 projects most outward in the left-right direction X (of the protruding portion 80). The cross section of the cutting part 11 when it cut|disconnects by the vertical cross section (BB cross section) which passes along the front direction Y center vicinity) is shown typically. As shown in FIG. 8, the rising angle β2 of the protrusion 80 with respect to the reference plane 30 in the BB cross section is set to 7° or more and 15° or less. The “reference surface 30</b>C” in FIG. 8 is obtained by moving the reference surface 30 in parallel with the height of the outer edge 80 a of the protruding portion 80, and the rising angle β<b>2 of the protruding portion 80 is the same as that of the protruding portion 80. The angle is defined by the tangent line of the upper surface 50 at the outer edge 80a and the reference surface 30C. Further, the outer edge 80a of the protruding portion 80 is a portion where the virtual line D extending from the horizontal cutting edge 71 along the upper surface outer peripheral portion 110 to the center in the left-right direction X and the upper surface 50 of the protruding portion 80 intersect. It should be noted that in the present embodiment, the virtual line D and the reference plane 30C coincide.

As shown in FIG. 5, the recess 81 is formed in an annular shape over the entire circumference of the outer edge 80 a of the protrusion 80. The recess 81 has a curved shape that is recessed downward in a vertical cross section from the edge of the upper surface 50 toward the outer edge 80a of the protrusion 80. The recess 81 has a width of, for example, 0.05 mm or more and 0.45 mm or less in the direction from the edge of the upper surface 50 toward the outer edge 80a of the protrusion 80. The recess 81 has a substantially constant width over the entire circumference of the outer edge 80a of the protrusion 80, and the difference between the largest width and the smallest width may be, for example, 0.25 mm or less.

The recess 81 includes, for example, a first recess 90 on the left and right lateral cutting edges 71 side of the projection 80, a second recess 91 on the front cutting edge 70 side of the projection 80, and a rear side of the projection 80. It has a third recess 92. The first recess 90, the second recess 91, and the third recess 92 are connected to each other to form an annular recess 81.

As shown in FIG. 7, the distance L1 (the length of the upper surface outer peripheral portion 100) from the front cutting edge 70 to the second recess 91 on the upper surface 50 is set to 0.05 mm or more and 0.35 mm or less. The distance L2 from the front cutting edge 70 on the upper surface 50 to the outer edge 80a of the protrusion 80 is set to 0.10 mm or more and 0.25 mm or less.

The upper surface 50 has a front surface upper surface outer peripheral portion 100 that is continuous with the front cutting edge 70 and is connected to the second recess 91. An apex angle 101 is formed at a connecting portion between the upper surface outer peripheral portion 100 on the front side and the second recess 91, and an internal angle β3 of the apex angle 101 is set to 140° or more and 170° or less. The radius of curvature r3 of the curved shape of the second recess 91 is set to 0.5 mm or more and 1.3 mm or less.

As shown in FIG. 8, the distance L3 from the horizontal cutting edge 71 to the first recess 90 on the upper surface 50 is set to 0.05 mm or more and 0.15 mm or less. The distance L4 from the horizontal cutting edge 71 on the upper surface 50 to the outer edge 80a of the protrusion 80 is set to 0.15 mm or more and 0.55 mm or less.

The upper surface 50 has a side surface 54 side upper surface outer peripheral portion 110 which is continuous with the horizontal cutting edge 71 and is connected to the first recess 90. An apex angle 111 is formed at a connecting portion between the upper surface outer peripheral portion 110 on the side surface 54 side and the first recess 90, and an internal angle β4 of the apex angle 111 is set to 140° or more and 170° or less. .. The curvature radius r4 of the curved shape of the first recess 90 is set to 0.2 mm or more and 0.6 mm or less.

As shown in FIG. 7, the front surface 52 has a clearance angle β5 in which the lower surface 55 side of the front surface 12 recedes rearward with respect to the clearance angle at the time of grooving, that is, the vertical direction of the lower surface 55 (mounting surface 30) in a side view. have. The clearance angle β5 is set to be larger than 0°, for example, about 7°.

As shown in FIG. 8, when viewed from the front, the side surface 54 is retracted to the center side in the left-right direction X with respect to the clearance angle during lateral feed processing, that is, the vertical direction of the lower surface 55 (mounting surface 30). It has a clearance angle of β6. The clearance angle β6 is set to, for example, greater than 0° and, for example, about 7°.

Next, a cutting tool having the cutting insert 1 will be described. The cutting tool 120 shown in FIG. 9 and FIG. 10 is a cutting-edge-type turning tool. The cutting tool 120 includes a tool body 130 and the cutting insert 1. The tool body 130 is formed in a long columnar shape, for example. The tool body 130 is provided with a fixing portion 140 for fixing the cutting insert 1 at the tip thereof. The fixing portion 140 includes a fixing surface 141 with which the mounting surface 30 of the cutting insert 1 abuts. For example, the cutting insert 1 can be fixed to the tool body 130 by placing the cutting insert 1 on the fixing portion 140 and tightening the fixing surface 142 with the fixing screw 142. The cutting insert 1 is attached to the tool body 130 such that the front surface 52 of the cutting portion 11 faces outward, for example, at a right angle to the axis S of the cutting tool 120, as shown in FIG. 10. Further, when the cutting tool 120 is attached to a lathe (cutting machine), the rising angle θ1 of the protrusion 80 with respect to the horizontal plane P is 8° or more and 30° or less, as shown in FIG. 11. The rising angle θ1 is an angle formed by the tangent to the upper surface 50 at the outer edge 80a of the protrusion 80 and the horizontal plane P.

When the cutting tool 120 is used by being attached to a lathe, the front surface 52 of the cutting insert 1 with respect to the inner peripheral surface of the cylindrical work material 150 rotated around the rotation axis F as shown in FIG. Are made to face each other, and the cutting insert 1 is moved toward the work material 150, for example, in the grooving direction K1 perpendicular to the rotation axis F to perform grooving. At this time, as shown by the dotted line in FIG. 11, the chips N emitted from the work material 150 by the front cutting edge 70 emerge in the rearward direction of the upper surface 50 and pass through the second recess 91 to project the protrusion 80. It is curled up and cut.

Next, as shown in FIG. 13, the cutting insert 1 is moved in the lateral feed direction K2 along the rotation axis F of the workpiece 150 to perform lateral feed machining. At this time, as shown by the dotted line in FIG. 8, the chips N emitted from the work material 150 by the horizontal cutting edge 71 are emitted toward the center of the upper surface 50 in the left-right direction X and pass through the first recess 90. It rides on the protrusion 80 and is curled and cut.

According to the present embodiment, since the upper surface 50 has the first recess 90 along the protruding portion 80 on the side of the horizontal cutting edge 71 of the protruding portion 80, chips are formed on the surface of the first recess 90. It goes down once, rides on the projection part 80 from there, and is cut. Thereby, even if the rising angle of the protrusion 80 is small, the curl diameter can be reduced. Therefore, in the lateral feed processing, the chip disposability can be improved without increasing the rising angle of the protrusion 80. Further, since the coolant (cutting oil) flows into and accumulates in the first recess 90 (between the surface of the first recess 90 and the chip N), the chip N flows smoothly and the cutting part 11 is cooled. Done effectively.

Since the upper surface 50 has the second concave portion 91 along the protruding portion 80 on the front cutting edge 70 side, the chips are temporarily lowered along the surface of the second concave portion 91, and from there. It rides on the protrusion 80 and is cut. Thereby, even if the rising angle of the protrusion 80 is small, the curl diameter can be reduced. Therefore, even in the grooving process, the chip disposability can be improved without increasing the rising angle of the protrusion 80. Further, since the coolant (cutting oil) flows into and accumulates in the second recess 91 (between the surface of the second recess 91 and the chip N), the chip N flows smoothly and the cutting part 11 is cooled. Done effectively.

Since the first recess 90 and the second recess 91 are continuous, the chip disposability can be reliably improved in the grooving process and the lateral feed process.

Since the upper surface 50 includes the first concave portion 90 and the second concave portion 91 and has the concave portion 81 provided over the entire circumference of the outer edge of the protruding portion 80, the upper surface 50 of the cutting portion 11 can be easily processed and formed. Become. In addition, the coolant easily flows from the rear side (third recess 92) of the protrusion 80 into the second recess 91 and the first recess 90, and the cooling effect of the cutting portion 11 and the deformation of chips (curl) are generated. The effect of making it improve.

As shown in FIG. 8, the rising angle β2 of the protrusion 80 with respect to the reference plane 30 in the vertical cross section perpendicular to the reference plane 30 of the cutting insert 1 and parallel to the front cutting edge 70 is 5° or more and 15° or less. In the lateral feed processing, the chip disposability can be improved without increasing the rising angle of the protrusion 80. When the rising angle β2 is 15° or less, the collision load of the chips N is surely reduced, and when the rising angle β2 is 5° or more, the chips N are reliably cut.

Since the distance L3 (the length of the upper surface outer peripheral portion 110) L3 from the horizontal cutting edge 71 to the first recess 90 on the upper surface 50 is 0.05 mm or more and 0.15 mm or less, the friction between the chips N and the upper surface 50 is reduced. It can be reduced. As a result, the chips N flow smoothly on the upper surface 50, and the chip disposability can be improved. Further, the wear of the cutting insert 1 can be suppressed. Further, since the distance L3 is 0.05 mm or more, the strength of the lateral cutting edge 71 can be sufficiently secured.

Since the distance L4 from the horizontal cutting edge 71 to the protruding portion 80 on the upper surface 50 is 0.15 mm or more and 0.55 mm or less, the distance L4 is sufficiently secured and the flow of the chips N on the upper surface 50 is sufficiently controlled. To be done. That is, the chips N enter the first recess 90, ride on the protrusion 80, and are curled and cut with a small diameter.

The upper surface 50 has an upper surface outer peripheral portion 110 on the side surface 54 side which is continuous with the horizontal cutting edge 71 and is connected to the first concave portion 90, and a connecting portion between the upper surface outer peripheral portion 110 on the side surface 54 side and the first concave portion 90 is provided. The apex angle 111 is formed, and the internal angle β4 of the apex angle 111 is 140° or more and 170° or less. As a result, a gap is surely formed between the first recess 90 and the chip N, and the coolant enters there, so that the chip N flows smoothly and the cutting portion 11 is cooled effectively.

As shown in FIG. 7, in the vertical section perpendicular to the reference surface 30 of the cutting insert 1 and orthogonal to the front cutting edge 70, the rising angle β1 of the protrusion 80 with respect to the reference surface 30 is -10° or more and 10° or less. Therefore, in the grooving process, the chip disposability can be improved without increasing the rising angle of the protrusion 80.

Since the distance L1 (the length of the upper surface outer peripheral portion 100) L1 from the front cutting edge 70 to the second recess 91 on the upper surface 50 is 0.05 mm or more and 0.35 mm or less, the friction between the chips N and the upper surface 50. Can be reduced. As a result, the chips N flow smoothly on the upper surface 50, and the chip disposability can be improved. Further, the wear of the cutting insert 1 can be suppressed. Further, since the distance L1 is 0.05 mm or more, the strength of the front cutting edge 70 can be sufficiently secured.

Since the distance L2 from the front cutting edge 70 to the protrusion 80 on the upper surface 50 is 0.10 mm or more and 0.45 mm or less, the distance L2 is sufficiently secured and the flow of the chips N on the upper surface 50 is sufficient. Controlled. That is, the chips N enter the second concave portion 91, ride on the protruding portion 80, and are curled and cut with a small diameter.

The upper surface 50 has a front-side upper surface outer peripheral portion 100 that is continuous with the front-side cutting edge 70 and is connected to the second recessed portion 91, and a connecting portion between the front-side upper surface outer peripheral portion 100 and the second recessed portion 91 is The apex angle 101 is formed, and the interior angle β3 of the apex angle 101 is 140° or more and 170° or less. As a result, a gap is surely formed between the second recess 91 and the chip N, and the coolant enters there, so that the chip N flows smoothly and the cutting portion 11 is cooled effectively.

The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to these examples. It is obvious to those skilled in the art that various changes or modifications can be conceived within the scope of the idea described in the claims, and naturally, they also belong to the technical scope of the present invention. Understood.

In the above embodiment, the first recesses 90 are provided on both the left and right sides of the protrusion 80, but they may be provided on only one side. The first recess 90 and the second recess 91 may be separated. The third recess 92 on the rear side of the protrusion 80 may be omitted.

In the above-described embodiment, the protruding portion 80 of the upper surface 50 has an elliptical shape in a top view, but the shape of the protruding portion 80 is not limited to this and may have another shape. For example, the projecting portion 80 may be substantially circular in a top view and may have a notch that is recessed rearward at the outer edge on the front cutting edge 70 side. Further, the protrusion 80 may be Y-shaped or U-shaped in a top view.

Further, in the above-described embodiment, one protrusion 80 is provided on the upper surface 50 of the cutting portion 11, but a plurality of protrusions 80, for example, two protrusions 80 as shown in FIG. 14, may be provided. .. In this case, a recess 81 (first recess 90, second recess 91) is provided around each protrusion 80. The two protruding portions 80 have an elongated shape and are arranged side by side in the left-right direction X. The two protruding portions 80 are arranged such that the distance between the two protruding portions 80 is wide on the front cutting edge 70 side and narrow on the rear side in a top view. May be. Further, in the above embodiment, the second recess 91 may not be provided on the front cutting edge 70 side of the protrusion 80, and in this case, the upper surface outer peripheral portion 100 and the protrusion 80 may be directly connected. Good.

Plural, for example, two cutting portions 11 may be provided in the main body portion 10. The two cutting parts 11 may be provided in point symmetry with respect to the center of the main body part 10 in a top view.

INDUSTRIAL APPLICABILITY The present invention is useful in providing a cutting insert and a cutting tool capable of improving the chip disposability without increasing the rising angle of the protrusion in the transverse feed processing.

DESCRIPTION OF SYMBOLS 1 Cutting insert 11 Cutting part 50 Upper surface 52 Front surface 54 Side surface 70 Front cutting edge 71 Side cutting edge 80 Protruding part 90 1st recessed part 91 2nd recessed part

Claims (9)

A cutting insert,
The top surface,
A front surface forming an intersecting ridgeline with the upper surface,
A side surface that is continuous with the front surface and forms an intersecting ridgeline with the upper surface;
A front cutting edge provided on an intersecting ridge line between the upper surface and the front surface,
A horizontal cutting edge provided on an intersecting ridgeline between the upper surface and the side surface,
The upper surface is
A protruding part,
On the side of the lateral cutting edge of the protrusion, a first recess provided along the protrusion,
A side surface upper surface continuous with the lateral cutting edge and connected to the first recess,
A reference surface serving as a mounting surface relative to the main body portion of the cutting tool have you in vertical section parallel to the front cutting edge in the vertical, the upper surface of the imaginary line that extends along the upper surface peripheral portion of the side cutting edge the protruding portion The rising angle of the protruding portion with respect to the reference plane translated in parallel to the position of the outer edge of the protruding portion where and intersect is 5° or more and 15° or less,
An apex angle is formed in a connecting portion between the outer peripheral surface of the upper surface on the side surface side and the first concave portion, and an internal angle of the apex angle is 140° or more and 170° or less,
The upper surface further has a second concave portion provided along the protrusion on the front cutting edge side of the protrusion,
The first recess and the second recess are continuous,
The cutting insert, wherein the upper surface includes the first recess and the second recess, and has a recess provided over the entire circumference of the outer edge of the protruding portion. The cutting insert according to claim 1, wherein a distance from the lateral cutting edge to the first recess on the upper surface is 0.05 mm or more and 0.15 mm or less. The cutting insert according to claim 1 or 2, wherein a distance from the lateral cutting edge to the protruding portion on the upper surface is 0.15 mm or more and 0.55 mm or less. The upper surface is continuous with the front cutting edge, has an upper surface outer peripheral portion on the front side,
Perpendicular to the reference plane serving as a mounting surface relative to the main body portion of the cutting tool, Oite in vertical section perpendicular to the front cutting edge, the imaginary line that extends rearward along the upper surface peripheral portion of the front side from the front cutting edge The rising angle of the projecting portion with respect to the reference plane, which is translated to the position of the outer edge of the projecting portion where the above and the upper surface of the projecting portion intersect , is −10° or more and 10° or less. The cutting insert according to any one of 1 to 3. The cutting insert according to any one of claims 1 to 4, wherein a distance from the front cutting edge to the second recess on the upper surface is 0.05 mm or more and 0.35 mm or less. The cutting insert according to any one of claims 1 to 5, wherein a distance from the front cutting edge to the protruding portion on the upper surface is 0.10 mm or more and 0.45 mm or less. The upper surface has a front surface upper surface peripheral portion that is continuous with the front cutting edge and is connected to the second recess,
The apex angle is formed in a connecting portion between the upper surface outer peripheral portion on the front side and the second concave portion, and the internal angle of the apex angle is 140° or more and 170° or less. The cutting insert according to any one of 1. The cutting insert according to claim 1, wherein the upper surface has a plurality of the protruding portions. A cutting tool comprising the cutting insert according to claim 1.

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