JP7239480B2 - Manufacturing method of cutting insert, cutting tool and cutting work - Google Patents

Description

Cross-reference to related applications

This application claims priority from Japanese Patent Application No. 2017-192511 filed on October 2, 2017, and the entire disclosure of this earlier application is incorporated herein for reference.

This aspect relates generally to cutting inserts used in cutting operations. More specifically, it relates to cutting tools made of materials with relatively high hardness, such as PCD and cBN.

DESCRIPTION OF RELATED ART As a cutting tool used when cutting work materials, such as a metal, the cutting insert of the international publication 2016/043127 (patent document 1) is known, for example. In Patent Document 1, a negative land of unequal width is arranged between the rake face on the upper surface and the flank face on the side surface. A cutting insert having a cutting edge is described. In Patent Document 1, the width of the land when viewed from the side monotonously decreases with increasing distance from the nose R cutting edge.

A cutting insert according to one aspect comprises a first surface, a second surface, a third surface and a land surface. The first face is polygonal and has a first corner that is convex outward and a linear first side that is connected to the first corner. The second surface is located opposite the first surface. The third surface is located between the first surface and the second surface. The land surface is located between the first surface and the third surface, and is inclined so as to approach the second surface as the distance from the first surface increases. In addition, the land surface is positioned along the entire first corner, and the intersection with the first surface and the intersection with the third surface are convex curve shapes, respectively, and the first land surface connected to the first corner. and a second land surface located along the entire length of the first side, adjacent to the first land surface and connected to the first side.

When the third surface is viewed from the front, the width of the first land surface is the first width, and the width of the second land surface is the second width. The first width at the portion of the first land surface connected to the central portion of the first corner is W11, and the first width at the end of the first land surface on the second land surface side is W12. be. At this time, the width W12 is narrower than the width W11. The second width at the end of the second land surface on the first land surface side is W21, and the second width at the end of the second land surface opposite to the first land surface is W22. At this time, the width W21 is narrower than the width W22. The second width widens from the end of the second land surface on the side of the first land surface to the end on the side opposite to the side of the first land surface.

It is a perspective view showing a cutting insert of an embodiment. 2 is a front view of the first surface of the cutting insert shown in FIG. 1; FIG. It is the side view which looked at the cutting insert shown in FIG. 2 from A1 direction. It is the side view which looked at the cutting insert shown in FIG. 2 from A2 direction. 3 is an enlarged view of a region C1 shown in FIG. 2; FIG. FIG. 6 is a cross-sectional view of the VI cross section in the cutting insert shown in FIG. 5 ; FIG. 6 is a sectional view of the VII section in the cutting insert shown in FIG. 5; FIG. 3 is a cross-sectional view of the VIII cross section in the cutting insert shown in FIG. 2 ; FIG. 6 is a cross-sectional view of the IX cross section in the cutting insert shown in FIG. 5; FIG. 6 is a cross-sectional view of the X cross section in the cutting insert shown in FIG. 5; FIG. 6 is a sectional view of the XI section in the cutting insert shown in FIG. 5; 7 is a cross-sectional view of another embodiment of the cutting insert shown in FIG. 6; FIG. FIG. 12 is a cross-sectional view of another embodiment of the cutting insert shown in FIG. 11; It is a front view showing a cutting tool of an embodiment. 15 is an enlarged view of a region C2 shown in FIG. 14; FIG. It is the schematic which shows 1 process of the manufacturing method of the cut workpiece of embodiment. It is the schematic which shows 1 process of the manufacturing method of the cut workpiece of embodiment. It is the schematic which shows 1 process of the manufacturing method of the cut workpiece of embodiment.

Hereinafter, cutting inserts 1 (hereinafter also simply referred to as inserts 1) of a plurality of embodiments will be described in detail with reference to the drawings. However, for convenience of explanation, each drawing referred to below shows only the main members necessary for explaining each embodiment in a simplified manner. Accordingly, the insert 1 may comprise any components not shown in the referenced figures. Also, the dimensions of the members in each drawing do not faithfully represent the actual dimensions of the constituent members, the dimensional ratios of the respective members, and the like.

<Cutting insert>
One insert 1 of the embodiment comprises a first surface 3 (top surface in FIG. 1), a second surface 5 (bottom surface in FIG. 1), a third surface 7 (side surface in FIG. 1) and a land surface 9. It has a generally polygonal plate shape.

The first surface 3 may be polygonal, as shown in FIG. The second surface 5 may be located opposite the first surface 3, as shown in FIG. The third surface 7 may be located between the first surface 3 and the second surface 5, as shown in FIG. The land surface 9 may be located between the first surface 3 and the third surface 7 as shown in FIG. The insert 1 may have a cutting edge 11 located at least part of the intersection of the land surface 9 and the third surface 7 .

The first surface 3 of the example shown in FIG. 1 has a polygonal outer peripheral edge, which is rhombic in FIG. Therefore, the first surface 3 has four corners and four sides. At this time, one of the four corners is the first corner 13 and two sides connected to the first corner 13 are the first side 15 and the second side 17 . In other words, the first corner 13 may be sandwiched between the first side 15 and the second side 17 at the outer peripheral edge of the first surface 3 .

Here, the polygonal shape is not strictly limited to a polygonal shape. For example, when the first surface 3 is viewed from the front, the four corners of the first surface 3 may each be rounded and slightly convex outward. Moreover, when the first surface 3 is viewed from the front, the four sides are not limited to strictly linear shapes. These sides may have a slightly convex shape or a slightly concave shape toward the outside when the first surface 3 is viewed from the front.

The second surface 5 may be polygonal, for example rhomboid like the first surface 3 . In this case, the third surface 7 has four generally flat planes and four curved surfaces connecting these planes.

In addition, the shape of the 1st surface 3 and the 2nd surface 5 is not limited to said form. In one embodiment of the insert 1, the shape of the first surface 3 and the second surface 5 is square. However, the shape of the first surface 3 and the second surface 5 may also be triangular or hexagonal, for example.

The size of the insert 1 is not particularly limited. For example, the length of one side of the first surface 3 can be set to approximately 3 mm or more and 20 mm or less. Also, the height from the first surface 3 to the second surface 5 can be set to approximately 5 mm or more and 20 mm or less.

As shown in FIGS. 1 to 5 and the like, the land surface 9 is a narrow belt-like area. Since the insert 1 has the land surface 9 , the cutting edge 11 is highly durable when the cutting edge 11 is positioned along the land surface 9 . Note that the land surface 9 may be connected to the cutting edge 11 .

The land surface 9 may be positioned along the entire outer peripheral edge of the first surface 3 or may be positioned along only a portion of the outer peripheral edge of the first surface 3 . For example, the land surface 9 may be located only along the first corner 13 and the first side 15 of the square first surface 3 .

The land surface 9 in the embodiment is inclined so as to approach the second surface 5 as the distance from the first surface 3 increases. That is, the land surface 9 in the embodiment is a so-called negative land. At this time, it is sufficient that the end of the land surface 9 on the third surface 7 side is positioned closer to the second surface 5 than the end of the land surface 9 on the first surface 3 side. That is, the land surface 9 as a whole may be inclined, but the land surface 9 does not necessarily have to be inclined as a whole.

The first face 3 may have a rake face region 3a at least in part. In the embodiment, the area along the land surface 9 on the first surface 3 is the rake surface area 3a. The rake face region 3 a may be connected to the land surface 9 .

The third surface 7 may have a flank area 7a at least partially. In the embodiment, the area along the land surface 9 on the third surface 7 is the flank area 7a. The flank area 7 a may be connected to the land surface 9 .

The land surface 9 in the embodiment has a first land surface 19 and a second land surface 21 . The first land surface 19 is located along the first corner 13 on the first surface 3 and is connected to the first corner 13 . The second land surface 21 is positioned along the first side 15 of the first surface 3 and is connected to the first side 15 . When the third surface 7 is viewed from the front, the width of the first land surface 19 is the first width W1. Further, when the third surface 7 is viewed from the front, the width of the second land surface 21 is the second width W2.

A portion of the first land surface 19 connected to the central portion of the first corner 13 is defined as a central portion 19a. The first width W1 at the central portion 19a is W11. An end portion of the first land surface 19 on the second land surface 21 side is defined as a first end portion 19b. A first width W1 at the first end 19b is W12. As shown in FIGS. 6 and 7, the width W12 may be narrower than the width W11.

A second width W2 at the end of the second land surface 21 on the first land surface 19 side is W21. An end portion of the second land surface 21 opposite to the first land surface 19 side is defined as a second end portion 21a. A second width W2 at the second end 21a is W22. As shown in FIGS. 7 and 8, the width W21 may be narrower than the width W22.

The width of the land surface 9 when viewing the insert 1 shown in FIG. It is relatively narrow near the boundary of surface 21 . Therefore, the insert 1 shown in FIG. 7 has high machinability. Moreover, the width W11 and the width W22 of the land surface 9 are relatively wide, rather than simply the width of the entire land surface 9 being narrow. Therefore, the insert 1 shown in FIGS. 6 to 8 has high durability.

In addition, in the example shown in FIG. 7 , the second land surface 21 is adjacent to the first land surface 19 . Therefore, the end portion of the second land surface 21 on the side of the first land surface 19 indicates the same location as the first end portion 19b. Therefore, in the example shown in FIG. 7, the width W21 is equal to the width W12. Also, in order to facilitate visual understanding, the first width W1, the width W11, the width W12, the second width W2, and the width W22 are shown in the cross-sectional view in the embodiment.

Here, the first width W1 of the first land surface 19 when the third surface 7 is viewed from the front is, for example, as shown in FIG. It means the width in the direction perpendicular to the intersection of the first land surfaces 19 . Further, the second width W2 of the second land surface 21 when the third surface 7 is viewed from the front is, for example, as shown in FIG. It means the width in the direction perpendicular to the intersection of the two land surfaces 21 .

For example, a large cutting load is likely to be applied to the first end portion 19b during cutting in which the first end portion 19b is located forward in the feed direction relative to the central portion 19a and the second end portion 21a. However, in the example shown in FIG. 7, since the width W12 is relatively narrow, the cutting edge 11 positioned at the first end portion 19b has a high sharpness. Therefore, the cutting load applied to the first end portion 19b is reduced, and the cutting ability of the cutting edge 11 is high.

Moreover, the width W11 and the width W22 of the land surface 9 are relatively wide, rather than simply the width of the entire land surface 9 being narrow. Therefore, the insert 1 shown in FIG. 7 has high durability of the cutting edge 11 as a whole.

When the third surface 7 is viewed from the front, the first width W1 and the second width W2 of the land surface 9 indicated by the distance between the first surface 3 and the third surface 7 are, for example, 0.01 mm or more and 0.5 mm or less. can be set to some extent. The width W11 of the central portion 19a can be set to, for example, approximately 0.05 mm or more and 0.5 mm or less. The width W12 of the first end portion 19b can be set to, for example, approximately 0.01 mm or more and 0.3 mm or less. Also, the width W22 of the second end portion 21a can be set to, for example, about 0.05 mm or more and 0.5 mm or less.

In the embodiment, the width W12 of the first end portion 19b is narrower than the width W11 of the central portion 19a. When the third surface 7 is viewed from the front, the first land surface 19 may have a portion where the first width W1 is constant from the center portion 19a toward the first end portion 19b.

As in the examples shown in FIGS. 6, 7 and 9, when the third surface 7 is viewed from the front, the first land surface 19 approaches the second land surface 21, in other words, the first end portion 19b from the central portion 19a. , the first width W1 may have a narrow portion. When the first land surface 19 has the structure described above, it is easy to avoid sudden changes in the first width W1. Therefore, machinability and durability are even higher. In particular, when the first width W1 of the first land surface 19 narrows from the center portion 19a to the first end portion 19b, the machinability and durability are even higher.

Moreover, in the embodiment, the width W21 is narrower than the width W22. When the third surface 7 is viewed from the front, the second width W2 is constant as the second land surface 21 approaches the second end 21a from the end (first end 19b) on the first land surface 19 side. You may have a part that is

As in the examples shown in FIGS. 7, 8 and 10, when the third surface 7 is viewed from the front, the second land surface 21 increases in width W2 from the first end 19b toward the second end 21a. It may have a wider portion. When the second land surface 21 has the above configuration, it is easy to avoid a sudden change in the second width W2. Therefore, machinability and durability are even higher. In particular, when the second width W2 of the second land surface 21 widens from the first end portion 19b to the second end portion 21a, machinability and durability are even higher.

In order to facilitate visual understanding of the change in the first width W1 of the first land surface 19 in the example shown in FIG. 5, cross-sectional views are shown in FIGS. A first width W1 is shown. The width W12 shown in FIG. 7 is narrower than the first width W1 shown in FIG. 9, and the width W11 shown in FIG. 6 is wider than the first width W1 shown in FIG. As is clear from these figures, in the example shown in FIGS. 6, 7 and 9, the first width W1 of the first land surface 19 narrows from the central portion 19a toward the first end portion 19b. .

7, 8 and 10 show cross-sectional views of the second land surface in each cross-section to facilitate visual understanding of the change in the second width W2 of the second land surface 21 in the example shown in FIG. 21 second width W2 is shown. A width W12 shown in FIG. 7 is narrower than the second width W2 shown in FIG. 10, and a width W22 shown in FIG. 8 is wider than the second width W2 shown in FIG. As is clear from these figures, in the example shown in FIGS. 7, 8 and 10, the second width W2 of the second land surface 21 narrows as the first land surface 19 is approached.

The width of the land surface 9 when viewed from the side of the first surface 3 is not limited to a specific configuration. For example, in the example shown in FIG. 5, the width of the land surface 9 at the first end 19b is narrower than the width of the land surface 9 at the central portion 19a. In the example shown in FIG. 5, the width of the land surface 9 at the first end 19b is narrower than the width of the land surface 9 at the second end 21a.

In the example shown in FIG. 5, when the first surface 3 is viewed from the front, the intersection of the first surface 3 and the first land surface 19 is shown in a convex curved shape. Moreover, when the first surface 3 is viewed from the front, the intersection of the third surface 7 and the first land surface 19 is also shown in a convex curved shape. At this time, the radius of curvature of each intersection may be the same or different.

As in the example shown in FIG. 5, the intersection of the first surface 3 and the first land surface 19 and the intersection of the third surface 7 and the first land surface 19 are circular arc shapes with constant radii of curvature, In addition, the radius of curvature of the intersection of the first surface 3 and the first land surface 19 may be larger than the radius of curvature of the intersection of the third surface 7 and the first land surface 19 .

As described above, the cutting edge 11 is positioned at least part of the intersection of the land surface 9 and the third surface 7 . In the example shown in FIG. 5 , a first cutting edge 11 a is positioned as the cutting edge 11 at the intersection of the first land surface 19 and the third surface 7 . A second cutting edge 11 b is positioned as the cutting edge 11 at the intersection of the second land surface 21 and the third surface 7 .

In the example shown in FIG. 5, the intersection of the first land surface 19 on which the first cutting edge 11a is located and the third surface 7 has an arc shape with a constant radius of curvature in a front view from the first surface 3 side. . Therefore, it is easy to avoid that the cutting load applied to the first cutting edge 11a is concentrated on one part, and the durability of the first cutting edge 11a is high. Further, when the radius of curvature of the intersection of the first surface 3 and the first land surface 19 is larger than the radius of curvature of the intersection of the third surface 7 and the first land surface 19, the durability of the first cutting edge 11a is increased. However, the width W12 is likely to be set narrower than the width W11.

A symbol O1 shown in FIG. 1 and the like is a central axis connecting the center of the first surface 3 and the center of the second surface 5. Reference symbol S shown in FIG. 3 and the like denotes a reference plane representing a virtual plane perpendicular to the central axis O1. The inclination angle of the first land surface 19 with respect to the reference plane S is the first inclination angle θ1. The first tilt angle θ1 may be evaluated, for example, in a cross section orthogonal to the first corner 13 . Further, the inclination angle of the second land surface 21 with respect to the reference plane S is the second inclination angle θ2. The second tilt angle θ2 may be evaluated on a cross section perpendicular to the first side 15, for example.

The first inclination angle θ1 may be constant from the central portion 19a to the first end portion 19b, or may vary from the central portion 19a to the first end portion 19b. For example, in FIGS. 6, 7 and 9, the first inclination angle .theta.1 is the same, and in the example shown in these figures, the first inclination angle .theta.1 of the first land surface 19 is constant.

As shown in these figures, when the first tilt angle θ1 is the same at least at three locations on the first land surface 19, it may be considered that the first tilt angle θ1 is constant. When the first inclination angle .theta.1 is constant, the chip flow becomes smooth, and the chip discharging performance is high.

Also, the second inclination angle θ2 may be constant from the first end portion 19b to the second end portion 21a, or may vary from the first end portion 19b to the second end portion 21a. For example, in FIGS. 7, 8 and 10, the second inclination angle .theta.2 is the same, and in the example shown in these figures, the second inclination angle .theta.2 of the second land surface 21 is constant.

As shown in these figures, when the second inclination angle θ2 is the same at least at three locations on the second land surface 21, it may be considered that the second inclination angle θ2 is constant. Even when the second inclination angle θ2 is constant, the chip flow is smooth, so the chip discharging performance is high.

In the present disclosure, constant tilt angles are not limited to strictly the same tilt angles. The tilt angle may have a slight variation of about 5%.

As in the example shown in FIG. 3, when the third surface 7 is viewed from the front, the intersection of the first land surface 19 and the third surface 7 is the second surface 5 as it approaches the first end portion 19b from the central portion 19a. may have a portion away from the

When the intersection of the first land surface 19 and the third surface 7 is configured as described above, the thickness of the portion where the second end portion 21a is located is likely to be thick. Therefore, the machinability and durability of the first end portion 19b are high.

As shown in FIG. 4 , the land surface 9 may further have a third land surface 23 connected to the second side 17 . At this time, the end of the first land surface 19 on the side of the third land surface 23 is defined as a third end 19c. The first width W1 at the third end 19c is W13. The width W13 may be narrower than the width W11, as in the examples shown in FIGS. Also, as in the example shown in FIGS. 12 and 13, the width W13 at the third end portion 19c may be wider than the width W11 at the central portion 19a.

When the width W13 is narrower than the width W11 as in the example shown in FIGS. Even when the intersection is used as the cutting edge 11, the first land surface 19 has high machinability and durability. That is, it can be used in both so-called right-handed and left-handed cutting tools. Therefore, the insert 1 is economical.

The first land surface 19 may have a portion where the first width W1 becomes narrower from the center portion 19a toward the third end portion 19c. When the first land surface 19 has the structure described above, it is easy to avoid sudden changes in the first width W1. Therefore, machinability and durability are even higher. In particular, when the first width W1 of the first land surface 19 is narrowed from the center portion 19a to the third end portion 19c, machinability and durability are even higher.

As in the example shown in FIGS. 12 and 13, when the width W13 is wider than the width W11, the strength of the first land surface 19 at the third end 19c is improved. Therefore, the insert 1 has high machinability and further improved durability.

The first land surface 19 may have a portion where the first width W1 increases from the center portion 19a toward the third end portion 19c. When the first land surface 19 has the structure described above, it is easy to avoid sudden changes in the first width W1. Therefore, machinability and durability are further enhanced. In particular, when the first width W1 of the first land surface 19 widens from the central portion 19a to the third end portion 19c, the machinability and durability are even higher.

Further, when the third surface 7 is viewed from the front, the third width W3 of the third land surface 23 connected to the second side 17 is constant, but changes as the distance from the first land surface 19 increases. may For example, the third width W3 of the third land surface 23 may become narrower with distance from the first land surface 19 . Similarly to the second land surface 21, if the third land surface 23 has a portion in which the third width W3 increases with increasing distance from the first land surface 19, machinability and durability are even higher. .

Further, the width of the third land surface 23 when the first surface 3 is viewed from the front may be constant, or may vary as the distance from the first land surface 19 increases.

The shape of the land surface 9 in the cross section orthogonal to the intersection of the first surface 3 and the land surface 9 is not limited to a specific shape. In the above cross section, the land surface 9 may, for example, have a linear shape, or may have a concave portion as in the examples shown in FIGS. 6 to 13 .

In the example shown in FIGS. 6 to 13, the entire land surface 9 in the cross section is concave. As shown in FIGS. 6 to 13, when the first land surface 19 has a concave portion, the inclination angle of the land surface 9 can be reduced, and the land angle when the third surface 7 is viewed from the front can be reduced. The width of the surface 9 can be reduced. Therefore, the sharpness of the cutting edge 11 is high.

Materials for the insert 1 include, for example, cemented carbide, cermet, ceramics, PCD (polycrystalline diamond), and cBN (cubic boron nitride).

Examples of compositions of cemented carbide include WC (tungsten carbide)-Co, WC-TiC (titanium carbide)-Co, and WC-TiC-TaC (tantalum carbide)-Co. Here, WC, TiC and TaC are the hard particles and Co is the binder phase. A cermet is a sintered composite material in which a metal is combined with a ceramic component. Specifically, the cermet includes a compound containing TiC or TiN (titanium nitride) as a main component. In addition, the material of the insert 1 is not limited to these.

Moreover, the insert 1 may have only one member made of the material exemplified above, or may have a plurality of members made of the material exemplified above.

For example, the insert 1 may have a body portion 25 and a cutting portion 27 as shown in FIG. 1, and may have a polygonal plate shape as a whole. The body portion 25 in the example shown in FIG. 1 has a substantially polygonal plate shape, and has a concave shape with a part cut out. The cut portion 27 may be joined to the notched recessed portion using brazing material or the like.

Here, the first corner 13, the first side 15 and the second side 17 may be positioned at the cutting portion 27 as in the example shown in FIG. To facilitate visual understanding, the cutting portion 27 is hatched with oblique lines in FIG.

The cutting portion 27 may be made of a material with relatively high hardness, such as PCD and cBN, and the body portion 25 may be made of cemented carbide, cermet, or ceramics, for example. When the body portion 25 and the cutting portion 27 are made of the above materials, the insert 1 can be manufactured at low cost. In addition, the insert 1 has high durability against cutting loads. The hardness of the body portion 25 and the cutting portion 27 may be evaluated by measuring the Vickers hardness of each portion.

The insert 1 may have only the cutting portion 27 and the main body portion 25, but for example, in addition to the cutting portion 27 and the main body portion 25, a coating layer that covers the surfaces of these portions may be provided. The coating layer may cover the entire surface of the substrate constituted by the cutting portion 27 and the body portion 25, or may cover only a portion of the surface of the substrate.

Examples of the material of the coating layer include aluminum oxide (alumina), titanium carbide, nitride, oxide, carbonate, nitroxide, carbonitride and carbonitride. The coating layer may contain only one of the above materials, or may contain a plurality of them.

Moreover, the coating layer may be composed of only one layer, or may be composed of a plurality of laminated layers. In addition, the material of the coating layer is not limited to these. The coating layer can be placed over the substrate by using, for example, chemical vapor deposition (CVD) or physical vapor deposition (PVD) methods.

The insert 1 of the embodiment may have a through hole 29 as shown in FIG. The through holes 29 in the embodiment are formed from the first surface 3 to the second surface 5 and are open on these surfaces.

The through hole 29 may extend along the central axis O1 passing through the center of the first surface 3 and the center of the second surface 5 . The through-holes 29 may also be used for attaching fixing screws or clamping members when holding the insert 1 in the holder. It should be noted that there is no problem even if the through holes 29 are opened in regions on the third surface 7 that are located on opposite sides of each other.

<Cutting tool>
Next, the cutting tool 101 of the embodiment will be described with reference to the drawings.

A cutting tool 101 of the embodiment comprises a holder 105 having a pocket 103 (insert pocket) on the tip side, and the insert 1 located in the pocket 103, as shown in FIGS. In the cutting tool 101 of the embodiment, the insert 1 is mounted so that the ridge line protrudes from the tip of the holder 105 .

The holder 105 has an elongated bar shape. One pocket 103 is provided on the tip side of the holder 105 . The pocket 103 is a portion to which the insert 1 is attached, and is open to the distal end surface of the holder 105 .

At this time, since the pocket 103 is also open to the side surface of the holder 105, the insert 1 can be easily mounted. Specifically, the pocket 103 has a seating surface parallel to the lower surface of the holder 105 and a restraining side surface inclined with respect to the seating surface.

The insert 1 is located in the pocket 103 . At this time, the lower surface of the insert 1 may be in direct contact with the pocket 103, or a sheet may be sandwiched between the insert 1 and the pocket 103.

The insert 1 is mounted so that the portion of the ridge used as the cutting edge protrudes outward from the holder 105 . In an embodiment the insert 1 is attached to the holder 105 by means of a fixing screw 107 . That is, the insert 1 is attached to the holder 105 by inserting the fixing screw 107 into the through hole of the insert 1, inserting the tip of the fixing screw 107 into the screw hole formed in the pocket 103, and screwing the screw portions together. is installed.

Steel, cast iron, or the like can be used as the holder 105 . In particular, from the viewpoint of increasing the toughness of the holder 103, steel may be used in these members.

In the embodiment, a cutting tool used for so-called turning is exemplified. Turning includes, for example, inner diameter machining, outer diameter machining, and grooving. The cutting tools are not limited to those used for turning. For example, the insert of the above embodiment may be used for a cutting tool used for milling.

<Manufacturing method for cutting products>
Next, a method for manufacturing a machined product according to the embodiment will be described with reference to the drawings.

The cutting work is produced by cutting the work material 201 . A method for manufacturing a cut product according to an embodiment includes the following steps. i.e.
(1) a step of rotating the work material 201;
(2) a step of bringing the ridge line of the cutting tool 101 represented by the above embodiment into contact with the rotating work material 201;
(3) separating the cutting tool 101 from the work material 201;
It has

More specifically, first, as shown in FIG. 16, the workpiece 201 is rotated around the axis O2, and the cutting tool 101 is moved relatively close to the workpiece 201. As shown in FIG. Next, as shown in FIG. 17, the cutting edge of the cutting tool 101 is brought into contact with the work material 201 to cut the work material 201 . Then, as shown in FIG. 18, the cutting tool 101 is moved away from the workpiece 201 relatively.

In the embodiment, the cutting tool 101 is brought closer to the work material 201 by moving the cutting tool 101 in the Y1 direction while the work material 201 is rotated while the axis O2 is fixed. In FIG. 17, the work material 201 is cut by bringing the cutting edge of the insert into contact with the rotating work material 201 . Also, in FIG. 18, the cutting tool 101 is moved in the Y2 direction while the work material 201 is being rotated to keep it away.

In addition, in the cutting work in the manufacturing method of the embodiment, in each step, the cutting tool 101 is brought into contact with the work material 201 by moving the cutting tool 101, or the cutting tool 101 is separated from the work material 201. However, it is of course not limited to such a form.

For example, in step (1), the work material 201 may be brought closer to the cutting tool 101 . Similarly, in step (3), the work material 201 may be kept away from the cutting tool 101 . In order to continue cutting, the process of keeping the workpiece 201 rotated and bringing the cutting edge of the insert into contact with different portions of the workpiece 201 may be repeated.

Representative examples of the material of the work material 201 include carbon steel, alloy steel, stainless steel, cast iron, non-ferrous metals, and the like.

1 ... cutting insert (insert)
3 First surface 5 Second surface 7 Third surface 9 Land surface 11 Cutting edge 11a First cutting edge 11b Second cutting edge 13 First corner 15 First side 17 Second side 19 First land 19a Central portion 19b First end 19c Third end 21 Second land surface 21a Second end portion 23 Third land surface 25 Body portion 27 Cutting portion 29 Through hole 101 Cutting tool 103 ... pocket 105 ... holder 107 ... fixing screw 201 ... work material

Claims (11)

a first face having a polygonal shape and having a first corner convex outward and a linear first side connected to the first corner;
a second surface located on the opposite side of the first surface;
a third surface located between the first surface and the second surface;
a land surface positioned between the first surface and the third surface and inclined so as to approach the second surface as the distance from the first surface increases;
The land surface is
a first land surface located along the entire area of the first corner, having convex curve shapes at intersections with the first surface and intersections with the third surface, and connecting to the first corner;
a second land surface located along the entire length of the first side, adjacent to the first land surface, and connected to the first side;
When the third surface is viewed from the front, the width of the first land surface is a first width, and the width of the second land surface is a second width,
The first width at the portion of the first land surface connected to the central portion of the first corner is W11, and the width at the end of the first land surface on the side of the second land surface is W11. The first width is W12,
W12 is narrower than W11,
The second width at the end of the second land surface on the first land surface side is W21, and the end of the second land surface opposite to the first land surface side is The second width of is W22,
the W21 is narrower than the W22,
The cutting insert, wherein the second width widens from an end of the second land surface on the first land surface side to an end on the opposite side of the first land surface. 2. The cutting insert according to claim 1, wherein said first land surface has a portion where said first width narrows as it approaches said second land surface from a portion connected to a central portion of said first corner. . an inclination angle of the first land surface in a cross section orthogonal to the first corner is a first inclination angle;
3. The cutting insert according to claim 1 or 2, wherein said first inclination angle is constant. Claims 1 to 1, wherein when the third surface is viewed from the front, the intersection of the first land surface and the third surface has a portion away from the second surface as the second land surface is approached. 4. The cutting insert according to any one of 3. an inclination angle of the second land surface in a cross section orthogonal to the first side is a second inclination angle;
The cutting insert according to any one of claims 1 to 4, wherein said second inclination angle is constant. the first face further has a second side connected to the first corner;
The land surface further has a third land surface connected to the second side,
the first width at the end of the first land surface on the third land surface side is W13;
The cutting insert according to any one of the preceding claims, wherein said W13 is narrower than said W11. 7. The cutting insert according to claim 6, wherein said first land surface has a portion where said first width narrows as it approaches said third land surface from a portion connected to a central portion of said first corner. . a first face having a polygonal shape and having a first corner convex outward and a linear first side connected to the first corner;
a second surface located on the opposite side of the first surface;
a third surface located between the first surface and the second surface;
a land surface positioned between the first surface and the third surface and inclined so as to approach the second surface as the distance from the first surface increases;
The land surface is
a first land surface located along the first corner, having convex curve shapes at intersections with the first surface and intersections with the third surface, and connected to the first corner;
a second land surface located along the first side, adjacent to the first land surface, and connected to the first side;
When the third surface is viewed from the front, the width of the first land surface is a first width, and the width of the second land surface is a second width,
The first width at the portion of the first land surface connected to the central portion of the first corner is W11, and the width at the end of the first land surface on the side of the second land surface is W11. The first width is W12,
W12 is narrower than W11,
The second width at the end of the second land surface on the first land surface side is W21, and the end of the second land surface opposite to the first land surface side is The second width of is W22,
the W21 is narrower than the W22,
The second width widens from an end of the second land surface on the first land surface side to an end on the opposite side of the first land surface,
the first face further has a second side connected to the first corner;
The land surface further has a third land surface connected to the second side,
the first width at the end of the first land surface on the third land surface side is W13;
A cutting insert, wherein said W13 is wider than said W11. 9. The cutting insert according to claim 8, wherein said first land surface has a portion where said first width increases as it approaches said third land surface from a portion connected to a central portion of said first corner. . a holder having a pocket located on the tip side;
and a cutting insert according to any one of claims 1 to 9, located in said pocket. rotating the work material;
A step of bringing the cutting tool according to claim 10 into contact with the rotating work material;
and separating the cutting tool from the work material.

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