JP2020138287A - Cutting insert and cutting tool - Google Patents

Abstract

To provide a cutting insert capable of improving swarf treatability without increasing a rise angle of a protrusive part in transverse feed processing.SOLUTION: A cutting insert 1 comprises: a top face 50; a front face 52 that forms a crossing ridge line 51 between itself and the top face 50; a side face 54 that continues into the front face 52 and that forms a crossing ridge line 53 between itself and the top face 50; a front cutting edge 70 that is provided on the crossing ridge line 51 between the top face 50 and the front face 52; and a lateral cutting edge 71 that is provided on the crossing ridge line 53 between the top face 50 and the side face 54. The top face 50 has a protrusive part 80, and a first recess 90 that is provided along the protrusive part 80, on the lateral cutting edge 71 side of the protrusive part 80.SELECTED DRAWING: Figure 1

Description

The present invention relates to cutting inserts and cutting tools.

There are cutting inserts that perform grooving and lateral feed processing (see Patent Document 1). This type of cutting insert has a substantially rectangular parallelepiped body, a front surface having a protruding portion that serves as a chip breaker, a front surface that forms a crossing ridge line between the top surface, and a continuous surface on both sides of the front surface. A front cutting edge for grooving is provided on the cross ridge line between the top surface and the front surface, and a lateral feed is provided on the cross ridge line between the top surface and the side surface. Equipped with a cross-cutting blade for processing.

Then, at the time of 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 the front cutting edge is used for grooving. I do. Subsequently, from the state where the cutting insert has entered the work material and has been grooved, the cutting insert is fed in the direction of the rotation axis, and the transverse cutting is performed by the transverse cutting edge.

Actual Kaihei 3-120303

By the way, in the lateral feed processing, it is desirable to reduce the curl diameter of the chips in order to improve the chip processing property at the time of cutting. In particular, when the inner peripheral surface of a cylindrical work material is subjected to lateral feed processing, chips tend to collect inside the work material, so it is necessary to improve the chip discharge property and reduce the curl diameter. Is desirable. Therefore, it is conceivable that the rising angle of the protruding portion is increased, and when the chips hit the protruding portion, the protrusion is greatly bent.

However, if the rising angle of the protruding portion is increased as described above, the collision load of the chips with respect to the protruding portion increases, so that the cutting insert may be damaged.

The present invention has been made in view of this point, and provides a cutting insert and a cutting tool capable of improving chip controlability without increasing the rising angle of the protruding portion in lateral feed machining. Is one of the purposes.

The cutting insert according to one aspect of the present invention includes a front surface that forms an intersecting ridge line between the upper surface and the upper surface, a side surface that is continuous with the front surface and forms an intersecting ridge line between the upper surface, and the upper surface and the front surface. It is provided with a front cutting edge provided on the crossing ridgeline between the two, and a lateral cutting edge provided on the crossing ridgeline between the upper surface and the side surface. It has a first recess provided along the protruding portion.

According to this aspect, since the upper surface has a first recess along the outer edge of the protrusion on the lateral cutting edge side of the protrusion, chips are once lowered along the surface of the first recess, and there. It rides on the protruding part and is cut. As a result, the curl diameter can be reduced even if the rising angle of the protruding portion is small. Therefore, in the lateral feed processing, the chip controllability 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 surface in the vertical cross section perpendicular to the reference surface which is the mounting surface for the main body of the cutting tool and parallel to the front cutting edge is 5 ° or more and 15 ° or less. Good.

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

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

In the above embodiment, the upper surface has an outer peripheral portion on the upper surface on the side surface that is continuous with the lateral cutting edge and is connected to the first recess, and an apex angle is formed on the connecting portion between the outer peripheral portion on the upper surface on the side surface and the first recess. Is formed, and the internal angle of the apex angle may be 140 ° or more and 170 ° or less.

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

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 outer edge of the protruding portion.

In the above aspect, the rising angle of the protruding portion with respect to the reference surface in the vertical cross section perpendicular to the reference surface which is the mounting surface for the main body of the cutting tool and orthogonal to the front cutting edge is −10 ° or more and 10 ° or less. It 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 protruding portion 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 an outer peripheral portion on the upper surface on the front side which is continuous with the front cutting edge and is connected to the second concave portion, and a top is formed on the connecting portion between the outer peripheral portion on the upper surface on the front side and the second concave portion. An angle is formed, and the internal 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 protruding portions.

Another aspect of the cutting tool of the present invention comprises the cutting insert described above.

It is a perspective view of a cutting insert. It is a top view of the cutting insert. It is a side view of a cutting insert. It is a front view of the 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 the cutting portion. It is a schematic diagram of the BB cross section of FIG. 5 of the cutting portion. It is a perspective view which shows a part of a cutting tool. It is the figure which looked at the cutting tool from the tip 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 explanatory drawing for demonstrating the state at the time of grooving. It is explanatory drawing for demonstrating the state at the time of lateral feed processing. It is a perspective view of the cutting insert of another aspect.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The same elements are designated by the same reference numerals, and duplicate description will be omitted. Further, the positional relationship such as up, down, left and right shall be based on the positional relationship shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios in the drawings are not limited to the ratios shown. In addition, the following embodiments are examples for explaining the present invention, and the present invention is not limited to this embodiment.

1 is a perspective view of the 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. 4 is a cutting. It is a front view of the insert 1. FIG. 5 is an enlarged view of the top view of the cutting portion of the cutting insert 1.

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

The main body 10 has a substantially rectangular parallelepiped shape that is substantially square when viewed from above. 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, and 25 connecting the top surface 20 and the bottom surface 21. .. The bottom surface 21 is provided with a flat mounting surface 30 that comes into contact with the main body when the cutting tool is attached to the main body. The main body 10 has a through hole 31 penetrating in the vertical direction at the center thereof. Unless otherwise specified, the configuration of the cutting insert 1 will be described in the present specification with reference to the posture of the cutting insert 1 when the upper surface 20 is directed upward and the mounting surface 30 of the bottom surface 21 is horizontal.

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

In the present specification, the upper surface 50 of the cutting portion 11 of the cutting insert 1 is a surface facing upward in the above-mentioned reference posture of the cutting insert 1, and is a surface that becomes a rake surface during grooving and lateral feed processing. The front surface 52 faces the work material during the grooving process and is in the feed direction during the grooving process, and the side surface 54 is a surface in the feed direction during the lateral feed process. Further, the direction toward the side surface 54 parallel to the crossing ridge line 51 of the front surface 52 in the top view is the left-right direction X, the direction toward the front 52 at right angles to the left-right direction X in the top view is the front direction Y, and the direction away from the front 52. Is the rear.

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

The front cutting edge 70 and the lateral cutting edge 71 are formed in a straight line in the top view shown in FIG. As shown in FIG. 4, the front cutting edge 70 is formed to be linear even when viewed from the front. As shown in FIG. 3, the lateral cutting edge 71 is formed linearly in a side view. The lateral 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 protruding portion 80 is provided at the center of, for example, the upper surface 50. The protruding portion 80 is formed in an elliptical shape that is long in the front direction Y in a top view, for example. The protruding portion 80 has a substantially hemispherical shape that is curved upward so that the central portion is the highest. FIG. 7 is a vertical cross section (AA cross section) perpendicular to the mounting surface (reference surface) 30 of the cutting insert 1 shown in FIG. 5 and orthogonal to the front cutting edge 70, and passing through the center of the front cutting edge 70 in the left-right direction X. The cross section of the cutting portion 11 when cut in) is schematically shown. As shown in FIG. 7, the rising angle β1 of the protruding portion 80 with respect to the reference surface 30 in the AA cross section is set to −10 ° or more and 10 ° or less. The "reference surface 30A" in FIG. 7 is obtained by translating the reference surface 30 with respect to the height of the outer edge 80a of the protrusion 80, and the rising angle β1 of the protrusion 80 is the protrusion 80. The angle is defined as the angle formed by the tangent line of the upper surface 50 on the outer edge 80a and the reference surface 30A. Here, the outer edge 80a of the protruding portion 80 is a portion where the virtual line C extending rearward from the front cutting edge 70 along the outer peripheral portion 100 of the upper surface and the upper surface 50 of the protruding portion 80 intersect. Further, the rising angle β1 may have a positive angle with respect to the outer peripheral portion 100 of the upper surface, and does not necessarily have to have a positive angle with respect to the reference surface 30A.

The protruding portion 80 is higher than the front cutting edge 70, for example, with reference to the mounting surface (reference surface) 30. The height difference h between the protruding portion 80 and the front cutting edge 70 is set within 0.5 mm. The radius of curvature r2 on the upper surface of the protruding portion 80 is set to, for example, 0.6 mm or more and 1.1 mm or less. The "reference surface 30B" in FIG. 7 is obtained by translating the reference surface 30 to the height of the front cutting edge 70.

Further, FIG. 8 shows a portion (of the protruding portion 80) that is perpendicular to the reference surface 30 of the cutting insert 1 shown in FIG. 5 and parallel to the front cutting edge 70, and the protruding portion 80 projects most outward in the left-right direction X. The cross section of the cutting portion 11 when cut in a vertical cross section (BB cross section) passing through (near the center in the front direction Y) is schematically shown. As shown in FIG. 8, the rising angle β2 of the protruding portion 80 with respect to the reference surface 30 in the BB cross section is set to 7 ° or more and 15 ° or less. The "reference surface 30C" in FIG. 8 is obtained by translating the reference surface 30 to the height of the outer edge 80a of the protrusion 80, and the rising angle β2 of the protrusion 80 is the protrusion 80. The angle is defined as the angle formed by the tangent line of the upper surface 50 on 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 lateral cutting blade 71 along the outer peripheral portion 110 of the upper surface to the center in the left-right direction X and the upper surface 50 of the protruding portion 80 intersect. In the present embodiment, the virtual line D and the reference surface 30C coincide with each other.

As shown in FIG. 5, the recess 81 is formed in an annular shape over the entire circumference of the outer edge 80a of the protruding portion 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 protruding portion 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 protruding portion 80. The recess 81 has a substantially constant width over the entire circumference of the outer edge 80a of the protruding portion 80, and the difference between the largest width and the smallest width may be, for example, 0.25 mm or less.

The recess 81 is, for example, a first recess 90 on the left and right lateral cutting edge 71 side of the protruding portion 80, a second recess 91 on the front cutting edge 70 side of the protruding portion 80, and a rear side of the protruding portion 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 outer peripheral portion 100 of the upper surface) 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 protruding portion 80 is set to 0.10 mm or more and 0.25 mm or less.

The upper surface 50 has an outer peripheral portion 100 on the front side that is continuous with the front cutting edge 70 and is connected to the second recess 91. An apex angle 101 is formed at the connecting portion between the upper outer peripheral portion 100 on the front surface side and the second recess 91, and the 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 lateral 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 lateral cutting edge 71 on the upper surface 50 to the outer edge 80a of the protruding portion 80 is set to 0.15 mm or more and 0.55 mm or less.

The upper surface 50 has an outer peripheral portion 110 on the side surface 54 side that is continuous with the lateral cutting blade 71 and is connected to the first recess 90. An apex angle 111 is formed at the connection portion between the upper outer peripheral portion 110 on the side surface 54 side and the first recess 90, and the internal angle β4 of the apex angle 111 is set to 140 ° or more and 170 ° or less. .. The radius of curvature 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 during grooving, that is, a clearance angle β5 in which the lower surface 55 side of the front surface 12 recedes backward with respect to the vertical direction of the lower surface 55 (mounting surface 30). have. The clearance angle β5 is set to be larger than, for example, 0 °, for example, about 7 °.

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

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

When the cutting tool 120 is attached to a lathe and used, the front surface 52 of the cutting insert 1 is opposed to the inner peripheral surface of the tubular work material 150 rotated around the rotation axis F as shown in FIG. The cutting insert 1 is moved toward the work material 150 in the grooving direction K1 perpendicular to the rotation axis F, for example, to perform grooving. At this time, as shown by the dotted line of the arrow in FIG. 11, the chip N emitted from the work material 150 by the front cutting edge 70 exits in the rear direction of the upper surface 50, passes through the second recess 91, and passes through the protruding portion 80. Ride on, curl and be 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 work material 150 to perform lateral feed processing. At this time, as shown by the dotted line of the arrow in FIG. 8, the chip N emitted from the work material 150 by the lateral cutting edge 71 exits toward the center of the upper surface 50 in the left-right direction X and passes through the first recess 90. It rides on the protruding portion 80, curls and is cut.

According to the present embodiment, since the upper surface 50 has the first recess 90 along the protrusion 80 on the lateral cutting edge 71 side of the protrusion 80, chips are formed on the surface of the first recess 90. It descends once along the line, rides on the protrusion 80 from there, and is cut. As a result, the curl diameter can be reduced even if the rising angle of the protruding portion 80 is small. Therefore, in the lateral feed processing, the chip processing property can be improved without increasing the rising angle of the protruding portion 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 portion 11 is cooled. It is done effectively.

Since the upper surface 50 has a second recess 91 along the protrusion 80 on the front cutting edge 70 side of the protrusion 80, chips are once lowered along the surface of the second recess 91, and from there. It rides on the protruding portion 80 and is cut. As a result, the curl diameter can be reduced even if the rising angle of the protruding portion 80 is small. Therefore, even in the grooving process, the chip processing property can be improved without increasing the rising angle of the protruding portion 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 portion 11 is cooled. It is done effectively.

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

Since the upper surface 50 includes a first recess 90 and a second recess 91 and has a recess 81 provided over the entire outer edge of the protruding portion 80, the upper surface 50 of the cutting portion 11 can be easily machined. Become. Further, the coolant easily flows from the rear side (third recess 92) of the protruding portion 80 into the second recess 91 and the first recess 90, so that the cooling effect of the cutting portion 11 and the chips are deformed (curled). The effect of making it is improved.

As shown in FIG. 8, the rising angle β2 of the protruding portion 80 with respect to the reference surface 30 in the vertical cross section perpendicular to the reference surface 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 processing property can be improved without increasing the rising angle of the protruding portion 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 surely cut.

Since the distance (length of the outer peripheral portion 110 of the upper surface) L3 from the lateral cutting edge 71 on the upper surface 50 to the first recess 90 is 0.05 mm or more and 0.15 mm or less, friction between the chips N and the upper surface 50 is generated. It can be reduced. As a result, the chips N flow smoothly on the upper surface 50, and the chip disposability can be improved. Moreover, the consumption 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 lateral 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 chips N is sufficiently controlled on the upper surface 50. Will be done. That is, the chip N enters the first recess 90, rides on the protrusion 80, and is curled and cut with a small diameter.

The upper surface 50 has an upper outer peripheral portion 110 on the side surface 54 side that is continuous with the lateral cutting blade 71 and is connected to the first concave portion 90, and the upper surface outer peripheral portion 110 on the side surface 54 side and the first concave portion 90 are connected to each other. , 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 effectively cooled.

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

Since the distance (length of the outer peripheral portion 100 of the upper surface) 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. Moreover, the consumption 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 protruding portion 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 chips N is sufficient on the upper surface 50. Be controlled. That is, the chip N enters the second recess 91, rides on the protrusion 80, and is curled and cut with a small diameter.

The upper surface 50 has an upper outer peripheral portion 100 on the front side that is continuous with the front cutting edge 70 and is connected to the second recess 91, and the connecting portion between the upper outer peripheral portion 100 on the front side and the second recess 91 is formed. An apex angle 101 is formed, and the internal 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 effectively cooled.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the ideas described in the claims, and these also naturally belong to the technical scope of the present invention. It is understood as a thing.

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 protruding portion 80 may not be provided.

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

Further, in the above embodiment, one protruding portion 80 is provided on the upper surface 50 of the cutting portion 11, but a plurality of protruding portions 80 may be provided, for example, as shown in FIG. .. In this case, recesses 81 (first recess 90, second recess 91) are provided around each protrusion 80. The two protrusions 80 have an elongated shape and are arranged side by side in the left-right direction X, and the distance between the two protrusions 80 is wide on the front cutting edge 70 side and narrow on the rear side when viewed from above. You 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, even if the upper outer peripheral portion 100 and the protrusion 80 are directly connected. Good.

A plurality of cutting portions 11, for example, two may be provided in the main body portion 10. The two cutting portions 11 may be provided point-symmetrically with respect to the center of the main body portion 10 in a top view.

INDUSTRIAL APPLICABILITY The present invention is useful in providing a cutting insert and a cutting tool capable of improving chip controlability without increasing the rising angle of the protruding portion in lateral feed machining.

1 Cutting insert 11 Cutting part 50 Top surface 52 Front surface 54 Side surface 70 Front cutting edge 71 Horizontal cutting edge 80 Protruding part 90 First recess 91 Second recess

Claims (14)

It ’s a cutting insert,
On the top and
The front surface that forms a crossing ridge with the upper surface,
A side surface that is continuous with the front surface and forms an intersecting ridge line with the upper surface surface,
A front cutting edge provided at the intersecting ridge between the upper surface and the front surface,
A transverse cutting edge provided at an intersecting ridge line between the upper surface and the side surface is provided.
The upper surface is
Protruding part and
A cutting insert having a first recess provided along the protruding portion on the lateral cutting edge side of the protruding portion. The claim that the rising angle of the protruding portion with respect to the reference surface in a vertical cross section perpendicular to the reference surface which is the attachment surface to the main body of the cutting tool and parallel to the front cutting edge is 5 ° or more and 15 ° or less. The cutting insert according to 1. The cutting insert according to claim 1 or 2, wherein the 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 any one of claims 1 to 3, wherein the 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 has an outer peripheral portion on the upper surface on the side surface that is continuous with the lateral cutting edge and is connected to the first recess.
A top angle is formed in the connection portion between the outer peripheral portion of the upper surface on the side surface side and the first recess, and the internal angle of the apex angle is 140 ° or more and 170 ° or less. The cutting insert according to any one of the above. The cutting insert according to any one of claims 1 to 5, wherein the upper surface further has a second concave portion provided along the protruding portion on the front cutting edge side of the protruding portion. .. The cutting insert according to claim 6, wherein the first recess and the second recess are continuous. The cutting insert according to claim 7, wherein the upper surface includes the first recess and the second recess, and has a recess provided over the entire outer edge of the protruding portion. The rising angle of the protruding portion with respect to the reference surface in a vertical cross section perpendicular to the reference surface which is the mounting surface for the main body of the cutting tool and orthogonal to the front cutting edge is −10 ° or more and 10 ° or less. , The cutting insert according to any one of claims 6 to 8. The cutting insert according to any one of claims 6 to 9, wherein the 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 6 to 10, wherein the 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 an outer peripheral portion on the upper surface on the front side that is continuous with the front cutting edge and is connected to the second recess.
A top angle is formed in the connection portion between the outer peripheral portion of the upper surface on the front surface side and the second recess, and the internal angle of the apex angle is 140 ° or more and 170 ° or less. The cutting insert according to any one of the above. The cutting insert according to any one of claims 1 to 12, wherein the upper surface has a plurality of the protruding portions. A cutting tool comprising the cutting insert according to any one of claims 1 to 13.

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