JP7257230B2 - Cutting insert, cutting tool, and manufacturing method of cutting work - Google Patents

Description

Application of Patent Law Article 30, Paragraph 2 On April 26, 2018, Kyocera Corporation sold cutting inserts invented by Hirohisa Ishi to Kyocera Precision Tools Incorporated.

This aspect relates to a cutting tool used in cutting. Cutting tools include, for example, milling tools and turning tools. Examples of milling tools include milling tools and end mills.

BACKGROUND ART For example, a cutting insert described in Patent Document 1 is known as a cutting insert used when cutting a work material such as metal. The cutting insert described in Patent Document 1 has a second chamfered surface as a land surface. The width of the second chamfered surface is maximum on the bisector of the corner portion.

JP 2009-131943 A

When the cutting insert described in Patent Document 1 is used for cutting, the cutting angle is greater at a portion closer to one of the adjacent sides than at the portion located on the bisector of the corner portion. easy to grow. Therefore, it is required to increase the durability of the land surface at a portion closer to one of the sides adjacent to the corner than at a portion located on the bisector of the corner.

A cutting insert according to one aspect includes a first surface, a second surface, a third surface, a virtual central axis, and a virtual reference surface. The first surface has a first side, a second side, and a first corner located between the first side and the second side. The second surface is located opposite the first surface. The third surface is located between the first surface and the second surface. The central axis is an imaginary straight line passing through the center of the first surface and the center of the second surface. The reference plane is a virtual plane positioned between the first plane and the second plane and orthogonal to the central axis.

The first surface has a land surface that is connected to the third surface and slopes away from the reference surface as the distance from the third surface increases. The land surface has a first land surface connected to the first corner, a second land surface connected to the first side, and a third land surface connected to the second side. The first land surface has a first area adjacent to the second land surface and a second area adjacent to the third land surface. When the first surface is viewed from the front, the width of the first land surface in the second region is larger than the width of the first land surface in the first region.

The cutting insert of the above aspect has high durability.

It is a perspective view showing a cutting insert of an embodiment. 2 is an enlarged view of a region A1 shown in FIG. 1; FIG. FIG. 2 is a plan view of the cutting insert shown in FIG. 1 as seen from the first surface side; It is the side view which looked at the cutting insert shown in FIG. 3 from B1 direction. It is the side view which looked at the cutting insert shown in FIG. 3 from B2 direction. It is the side view which looked at the cutting insert shown in FIG. 3 from B3 direction. 4 is an enlarged view of a region A2 shown in FIG. 3; FIG. FIG. 8 is a cross-sectional view of the VIII cross section in the cutting insert shown in FIG. 7 ; FIG. 8 is a cross-sectional view of the IX cross section in the cutting insert shown in FIG. 7; FIG. 8 is a cross-sectional view of the X cross section in the cutting insert shown in FIG. 7; FIG. 8 is a sectional view of the XI section in the cutting insert shown in FIG. 7; FIG. 8 is a sectional view of the XII section in the cutting insert shown in FIG. 7; It is a perspective view showing a cutting tool of an embodiment. 14 is an enlarged view of a region A3 shown in FIG. 13; 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, the cutting insert 1 (hereinafter also simply referred to as the insert 1) of the embodiment 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 the embodiment in a simplified manner. Accordingly, the insert 1 disclosed below may comprise optional 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.

<Insert>
The insert 1 of the embodiment comprises a first surface 3, a second surface 5, a third surface 7, a virtual central axis S1 and a virtual reference surface S2. In the example shown in FIG. 1, the first surface 3 is the top surface, the second surface 5 is the bottom surface, and the third surface 7 is the side surface.

The first surface 3 has a first side 9 , a second side 11 and a first corner 13 . A first corner 13 is located between the first side 9 and the second side 11 . In other words, the first side 9 and the second side 11 each extend from the first corner 13 . The first face 3 may be a polygon with multiple corners and multiple sides, as shown in FIG. In the example shown in FIG. 1, one of the corners is the first corner 13 and two of the sides are the first side 9 and the second side 11 .

Although the first surface 3 of the example shown in FIG. 1 is rectangular, the shape of the first surface 3 is not limited to this. For example, the first surface 3 may be triangular, pentagonal or hexagonal. The example first surface 3 shown in FIG. 3 is generally square, but the shape of the first surface 3 is not limited to this. For example, the first surface 3 may be rectangular or rhomboidal.

The second surface 5 is located opposite the first surface 3 . The example second surface 5 shown in FIG. 1 is polygonal with multiple corners and sides, similar to the first surface 3 . Therefore, the insert 1 shown in FIG. 1 has a polygonal plate shape.

Although the second surface 5 has a polygonal shape like the first surface 3 , it does not have to be the same size as the first surface 3 . For example, the second surface 5 may be one size smaller than the first surface 3 . Moreover, the polygonal shape does not strictly mean a polygonal shape. For example, the four corners of the first surface 3 may each have a slightly rounded shape in a front view of the first surface 3, rather than being a strict angle.

Also, the four sides do not have to be strictly straight lines. In the example shown in FIG. 3, each of the four sides has an outwardly convex curved portion. The curved portion of the side has a larger radius of curvature than the corner of the first surface 3 and is a gentle curve.

A third surface 7 is located between the first surface 3 and the second surface 5 . The third surface 7 may be connected to the first surface 3 or another surface may be located between the first surface 3 and the third surface 7 . Similarly, the third surface 7 may be connected to the second surface 5 and another surface may be located between the second surface 5 and the third surface 7 . In the example shown in FIG. 1 the third surface 7 is connected to the first surface 3 and the second surface 5 .

A portion of the third surface 7 connected to the first side 9 and a portion connected to the second side 11 may each be a plane. Also, the portion of the third surface 7 connected to the first corner 13 may have a convex surface shape.

The central axis S1 is a virtual straight line passing through the center of the first surface 3 and the center of the second surface 5 . The center of the first surface 3 can be specified, for example, by the position of the center of gravity of the first surface 3 when the first surface 3 is viewed from the front. The center of the second surface 5 can be specified, for example, by the position of the center of gravity of the second surface 5 when the second surface 5 is viewed from the front.

The first surface 3 and the second surface 5 may be orthogonal to the central axis S1, or may be inclined with respect to the central axis S1. The first surface 3 may be rotationally symmetric with respect to the central axis S1. For example, as shown in FIG. 3, the first surface 3 may have 90° rotational symmetry with respect to the central axis S1.

The reference plane S2 is a virtual plane located between the first plane 3 and the second plane 5 and perpendicular to the central axis S1. The first surface 3 and the second surface 5 may be parallel to the reference plane S2 or may be inclined with respect to the reference plane S2. The reference plane S2 may be used as a positional reference for evaluating the height of each part forming the first plane 3 when the direction along the central axis S1 is taken as the height.

The maximum width when the first surface 3 is viewed from the front may be, for example, 6 mm or more and 25 mm or less. Also, the height from the first surface 3 to the second surface 5 may be, for example, 1 mm or more and 10 mm or less. Here, the height from the first surface 3 to the second surface 5 means the maximum value of the distance between the first surface 3 and the second surface 5 in the direction parallel to the central axis S1.

The insert 1 of the embodiment has a cutting edge 15 . The cutting edge 15 is positioned so as to include at least part of the ridgeline where the first surface 3 and the third surface 7 intersect. As in the example shown in FIG. 3, the cutting edge 15 may be positioned on the entire ridgeline where the first surface 3 and the third surface 7 intersect. Therefore, in the example shown in FIG. 2 , the cutting edge 15 is positioned at least at the first corner 13 , the first side 9 and the second side 11 .

The insert 1 may have a through hole 17 opening at the first face 3 . For example, as shown in FIG. 1 , the through hole 17 may be formed from the center of the first surface 3 toward the center of the second surface 5 . An exemplary through hole 17 is also open on the second surface 5 . The through hole 17 in the example shown in FIG. 1 is formed from the center of the first surface 3 toward the center of the second surface 5 . Therefore, in the example shown in FIG. 1, the axis of the through hole 17 coincides with the central axis S1.

The through hole 17 can be used for inserting a fixing member when fixing the insert 1 to the holder. Examples of fixing members include screws. When fixing the insert 1 to the holder, a clamp member, for example, may be used instead of the screw. The through hole 17 may be formed from the center of the first surface 3 toward the center of the second surface 5, but the through hole 17 is not limited to such a configuration. For example, the regions of the third surface 7 facing each other may be opened.

The first surface 3 has a land surface 19 . The land surface 19 is a narrow belt-like surface area located on the peripheral portion of the first surface 3 and connected to the third surface 7 . The land surface 19 may be used to increase the strength of the cutting edge 15 located on the ridgeline where the first surface 3 and the third surface 7 intersect. Therefore, the land surface 19 may be positioned so as to include the portion of the ridge line that is used as the cutting edge 15 . The width of the land surface 19 means the width in the direction orthogonal to the ridge line when the first surface 3 is viewed from the front.

The land surface 19 in the embodiment is slanted away from the reference surface S2 as the distance from the third surface 7 increases. That is, the land surface 19 in the example shown in FIG. 1 increases in height from the reference surface S2 as the distance from the third surface 7 increases. Therefore, the portion of the ridge that is used as the cutting edge 15 has high durability. The inclination angle of the land surface 19 is not particularly limited. The inclination angle θ of the land surface 19 can be set to, for example, 0° or more and 30° or less.

The land surface 19 in the example shown in FIG. 2 has a first land surface 21 , a second land surface 23 and a third land surface 25 . The first land surface 21 is the portion of the land surface 19 connected to the first corner 13 . The second land surface 23 is a portion of the land surface 19 connected to the first side 9 . The third land surface 25 is a portion of the land surface 19 connected to the second side 11 .

The boundary (first boundary T1) between the first land surface 21 and the second land surface 23 is, as shown in FIG. It may be evaluated by extending an imaginary straight line L1 orthogonal to the outer circumference of the first surface 3 at this connection point from the point. The boundary (second boundary T2) between the first land surface 21 and the third land surface 25 is, as shown in FIG. It may be evaluated by extending an imaginary straight line L1 orthogonal to the outer circumference of the first surface 3 at this connection point from the point.

The example first land surface 21 shown in FIG. 7 has a first region 21a and a second region 21b. The first area 21a is a partial area of the first land surface 21 adjacent to the second land surface 23 and includes the first boundary T1. The second area 21b is a partial area of the first land surface 21 adjacent to the third land surface 25 and includes the second boundary T2.

In the example shown in FIG. 7, when the first surface 3 is viewed from the front, the width W12 of the first land surface 21 in the second region 21b is larger than the width W11 of the first land surface 21 in the first region 21a. . Therefore, for example, the cutting angle of the portion of the first corner 13 located near the second side 11 (second portion 13b) is the portion of the first corner 13 located near the first side 9 (first portion The durability of the insert 1 is high during cutting such that the cutting angle is larger than the cutting angle of 13a).

When the cutting angle of the second portion 13b is larger than the cutting angle of the first portion 13a, a larger cutting load is likely to be applied to the second region 21b than to the first region 21a. In the insert 1 of the embodiment, the width W12 of the first land surface 21 in the second region 21b is larger than the width W11 of the first land surface 21 in the first region 21a, and a relatively large cutting load is likely to be applied. high durability. Therefore, the durability of the insert 1 as a whole is high.

In addition, in the insert 1 of the embodiment, the width W1 of the first land surface 21 is not large throughout, but the width W12 of the second region 21b is relatively large and the width W11 of the first region 21a is relatively large. small. Therefore, it is easy to avoid an excessive decrease in machinability. Thereby, for example, chatter vibration is easily suppressed.

As described above, the insert 1 of the embodiment can perform good cutting both when the cutting angle of the second portion 13b is larger than the cutting angle of the first portion 13a and when the first corner 13 is used as a wiper edge. Processing can be performed.

The width W11 of the first region 21a and the width W12 of the second region 21b are not limited to specific values. The width W11 of the first region 21a can be set to, for example, 0.1 mm or more and 1 mm or less. The width W12 of the second region 21b can be set to, for example, 0.2 mm or more and 1.5 mm or less. A ratio W12/W11 between the width W11 of the first region 21a and the width W12 of the second region 21b can be set to 1.1 or more and 3 or less, for example.

The inclination angle θ1 of the first region 21a with respect to the reference plane S2 may be the same as the inclination angle θ2 of the second region 21b with respect to the reference plane S2. In this case, the change in the inclination angle of the first land surface 21 is small. Therefore, variations in the strength of the insert 1 on the first land surface 21 can be easily suppressed. In addition, chips tend to flow smoothly during cutting.

The first land surface 21 may have a third region 21c. The third region 21c in the example shown in FIG. 7 is located on the bisector L3 of the first angle 13. As shown in FIG. Specifically, the third region 21c in the example shown in FIG. 7 is located so as to include the bisector L3 of the first angle 13 when the first surface 3 is viewed from the front. The third region 21c is positioned between the first region 21a and the second region 21b, and positioned between the first region 21a and the second region 21b.

When the first surface 3 is viewed from the front, the width W13 of the first land surface 21 in the third region 21c is greater than the width W11 of the first land surface 21 in the first region 21a, and the width W11 of the first land surface 21 in the second region 21b is It may be smaller than the width W12 of the first land surface 21 . In the case where the width W1 of the first land surface 21 changes stepwise as described above, the width W1 of the first land surface 21 increases as the cutting angle increases. Therefore, the durability of the insert 1 as a whole is further enhanced while avoiding an excessive decrease in machinability.

When the first surface 3 is viewed from the front, the width W1 of the first land surface 21 may increase from the first area 21a toward the second area 21b. When the width W1 of the first land surface 21 varies as described above, the width W1 of the first land surface 21 is greater in regions where the cutting angle is greater. Therefore, the durability of the insert 1 as a whole is further enhanced while avoiding an excessive decrease in machinability.

When the first land surface 21 has the third region 21c, the inclination angle θ3 of the third region 21c with respect to the reference plane S2 may be the same as the inclination angle θ1 of the first region 21a with respect to the reference surface S2. In this case, the change in the inclination angle of the first land surface 21 is small. Therefore, variations in the strength of the insert 1 on the first land surface 21 can be easily suppressed. In addition, chips tend to flow smoothly during cutting.

The second land surface 23 may have a fourth region 23a. The fourth region 23a in the example shown in FIG. 7 is located at least from a portion of the second land surface 23 adjacent to the first land surface 21 to the center of the first side 9. As shown in FIG. Here, when the first surface 3 is viewed from the front, the width W21 of the second land surface 23 in the fourth area 23a may be constant.

For example, during cutting such that the cutting angle of the second portion 13b is larger than the cutting angle of the first portion 13a, the cutting edge 1 located at the first corner 13 is larger than the cutting edge 15 located at the first side 9.
A large cutting load is likely to be applied to 5. Therefore, a relatively large cutting load is applied to the fourth region 23a of the second land surface 23, which is the portion located near the first land surface 21, compared to other portions of the second land surface 23. easy to join.

When the width W21 of the fourth area 23a of the second land surface 23 located relatively close to the first land surface 21 is constant, the load is easily dispersed over a wide area of the second land surface 23. FIG. Therefore, the durability of the second land surface 23 is high.

The third land surface 25 may have a fifth area 25a. The fifth region 25a in the example shown in FIG. 7 is located at a portion of the third land surface 25 adjacent to the first land surface 21. As shown in FIG. Here, when the first surface 3 is viewed from the front, the width W31 of the third land surface 25 in the fifth region 25a may decrease as the distance from the first land surface 21 increases.

In this case, for example, when the first corner 13 is used as a wiper edge, the surface roughness is small and the surface accuracy of the machined surface is high. This is because when the portion of the first side 9 connected to the fifth region 25a is used as part of the wiper edge, the cutting resistance of the portion of the first side 9 can be reduced.

The first face 3 may have a rake face 27 . The rake face 27 in the example shown in FIG. 7 is located inside the land face 19 . Moreover, the rake face 27 is inclined so as to separate from the reference plane S2 as it separates from the land surface 19 . When the first surface 3 has the rake face 27, the flow direction of chips generated on the cutting edge 15 is easily controlled. Therefore, chips can be stably processed.

The rake face 27 may have a first rake face 29 , a second rake face 31 and a third rake face 33 . In the example shown in FIG. 7 , the first rake face 29 is the area of the rake face 27 that is connected to the first land surface 21 . The second rake face 31 is a region of the rake face 27 connected to the second land surface 23 . The third rake face 33 is a region of the rake face 27 connected to the third land surface 25 .

As shown in FIG. 8, the maximum value of the inclination angle of the first rake face 29 with respect to the reference plane S2 is φ1. As shown in FIG. 9, the maximum value of the inclination angle of the second rake face 31 with respect to the reference plane S2 is φ2. As shown in FIG. 10, the maximum value of the inclination angle of the third rake face 33 with respect to the reference plane S2 is φ3. At this time, the tilt angle φ1 may be larger than the tilt angles φ2 and φ3.

During cutting of a work material, the flow direction of chips generated at the first corner 13 is more likely to be unstable than chips generated at the first side 9 and the second side 11 . However, when the inclination angle φ1 is larger than the inclination angles φ2 and φ3, the flow direction of chips generated at the first corner 13 is easily controlled at the first rake face 29 . Therefore, chips can be stably and easily processed.

The first rake face 29 may have a first portion 35 , a second portion 37 and a third portion 39 . In the example shown in FIG. 7 , the first portion 35 is a region of the first rake face 29 located adjacent to the second rake face 31 . The second portion 37 is a region of the first rake face 29 that is adjacent to the third rake face 33 .

The third portion 39 is a region located on the bisector L3 of the first angle 13 . Specifically, the third portion 39 in the example shown in FIG. 7 is positioned so as to include the bisector L3 of the first angle 13 when the first surface 3 is viewed from the front. The third portion 39 is located between the first portion 35 and the second portion 37 and is sandwiched between the first portion 35 and the second portion 37 .

As shown in FIG. 11, the inclination angle of the first portion 35 with respect to the reference plane S2 is φ11. As shown in FIG. 12, the inclination angle of the second portion 37 with respect to the reference plane S2 is φ12. As shown in FIG. 8, the inclination angle of the third portion 39 with respect to the reference plane S2 is φ13. At this time, the tilt angle φ13 may be larger than the tilt angles φ11 and φ12.

During cutting of a work material, the flow direction of chips generated at the first corner 13 is more likely to be unstable than chips generated at the first side 9 and the second side 11 . In particular, the flow direction of chips generated at the center of the first corner 13 located on the bisector L3 of the first corner 13 tends to be unstable. However, when the inclination angle φ13 is larger than the inclination angles φ11 and φ12, the flow direction of chips generated at the center of the first corner 13 is likely to be controlled at the third portion 39 . Therefore, chips can be stably and easily processed.

The second rake face 31 may have a fourth portion 41 . The fourth portion 41 in the example shown in FIG. 7 is positioned adjacent to the first rake face 29 . When the inclination angle of the fourth portion 41 with respect to the reference plane S2 is φ4, the inclination angle φ4 may decrease as the distance from the first rake face 29 increases.

During cutting of a work material, the flow direction of chips generated at the first side 9 tends to be more stable than that generated at the first corner 13 . When the inclination angle φ4 decreases with increasing distance from the first rake face 29, the inclination angle φ2 tends to be reduced while avoiding rapid changes in the inclination angles φ1 and φ2. Therefore, the flow of chips generated on the first side 9 tends to be smooth.

The third rake face 33 may have a fifth portion 43 . The fifth portion 43 in the example shown in FIG. 7 is positioned adjacent to the first rake face 29 . When the inclination angle of the fifth portion 43 with respect to the reference plane S2 is φ5, the inclination angle φ5 may decrease as the distance from the first rake face 29 increases.

During cutting of a work material, the flow direction of chips generated at the second side 11 tends to be more stable than that generated at the first corner 13 . When the inclination angle φ5 decreases with increasing distance from the first rake face 29, the inclination angle φ3 tends to be reduced while avoiding sudden changes in the inclination angles φ1 and φ3. Therefore, the flow of chips generated on the second side 11 tends to be smooth.

Examples of materials for the insert 1 include cemented carbide and cermet. Compositions of cemented carbide include, for example, WC--Co, WC--TiC--Co and WC--TiC--TaC--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. An example of a cermet is a titanium compound containing titanium carbide (TiC) or titanium nitride (TiN) as a main component. However, it goes without saying that the material of the insert 11 is not limited to the above composition.

The surface of the insert 1 may be coated with a coating using a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method. Compositions of the coating include titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN) and alumina (Al ₂ O ₃ ).

<Cutting tool>
Next, the cutting tool 101 of the embodiment will be described with reference to FIGS. 13 and 14. FIG. Figure 13
and FIG. 14 shows the state in which the insert 1 shown in FIG. In addition, in FIG. 13 and the like, the rotation axis Y1 of the cutting tool 101 is indicated by a chain double-dashed line.

The cutting tool 101 of the embodiment is used for milling. The cutting tool 101 has a holder 103 and an insert 1, as shown in FIG. The holder 103 has a cylindrical shape extending from a first end 103a to a second end along the rotation axis Y1. The holder 103 also has a pocket 105 located on the side of the first end 103a. The insert 1 is located in the pocket 105 mentioned above.

Only one pocket 105 may be provided, or a plurality of pockets may be provided as in the example shown in FIG. If the holder 103 has multiple pockets 105 , the cutting tool 101 may comprise multiple inserts 1 , one insert being located in each pocket 105 .

The pocket 105 may be open on the outer peripheral surface of the holder 103 and the end surface on the side of the first end 103a. In the case where the holder 103 has a plurality of pockets 105, these pockets 105 may be positioned at equal intervals or at unequal intervals around the rotation axis Y1. The holder 103 does not have a strictly cylindrical shape, as is evident from the presence of the pocket 105 and the like.

The insert 1 is mounted in the pocket 105 such that at least part of the cutting edge protrudes from the holder 103 . Specifically, in the embodiment, the cutting edge is attached to the holder 103 so as to be located outside the outer peripheral surface of the holder 103 .

In the cutting tool 101 of the embodiment, the second surface and the third surface of the insert 1 are in contact with the holder 103 .

In an embodiment, insert 1 is attached to pocket 105 by screws 107 . That is, by inserting the screw 107 into the through-hole of the insert 1, inserting the tip of the screw 107 into a screw hole (not shown) formed in the pocket 105, and fixing the screw 107 to the screw hole, the insert 1 is is attached to the holder 103 .

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

<Manufacturing method for cutting products>
Next, a method for manufacturing a machined product according to an embodiment of the present invention will be described with reference to FIGS. 15 to 17. FIG. 15 to 17 show a method of manufacturing a cut product when cutting is performed using the cutting tool described above. 15 to 17, the rotation axis Y1 of the cutting tool 101 is indicated by a chain double-dashed line. The cutting work 203 is produced by cutting the work material 201 . A manufacturing method in an embodiment includes the following steps. i.e.
(1) a step of rotating the cutting tool 101 represented by the above embodiment;
(2) bringing the rotating cutting tool 101 into contact with the work piece 201;
(3) separating the cutting tool 101 from the work material 201;
It has

More specifically, first, as shown in FIG. 15, the cutting tool 101 is brought relatively closer to the work material 201 while rotating in the Y2 direction around the rotation axis Y1. Next, as shown in FIG. 16, 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. 17, the cutting tool 101 is moved away from the workpiece 201 relatively.

In the embodiment, the work material 201 is fixed and the cutting tool 101 is brought closer. 15 to 17, the work material 201 is fixed and the cutting tool 101 is rotated around the rotation axis Y1. In addition, in FIG. 17, the work material 201 is fixed and the cutting tool 101 is kept away. In addition, in the cutting process in the manufacturing method of the embodiment, the work material 201 is fixed and the cutting tool 101 is moved in each process, but 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 . To continue cutting, the cutting tool 101 is maintained in a rotating state, and the process of bringing the cutting edge of the insert into contact with different locations on the work material 201 may be repeated.

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

1 ... cutting insert (insert)
3 First surface 5 Second surface 7 Third surface 9 First side 11 Second side 13 First corner 13a First portion 13b Second portion 15 Cutting edge 17 Through hole 19 Land surface 21 First land surface 21a First region 21b Second region 21c Third region 23. Second land surface 23a Fourth region 25 Third land surface 25a Fifth region 27 Rake face 29 First rake face 31 Second rake face 33 Third rake face 35 First part 37 Second part 39 Third part 41 Fourth part 43 Fifth part 101 Cutting tool 103 Holder 103a First end 103b Second end 105 Pocket 107 Screw 201 Work material S1 Central axis S2 Reference surface θ Land surface Tilt angle θ1 Tilt angle of first region θ2 Tilt angle of second region θ3 Tilt angle of third region T1 First boundary T2 Second boundary L1 Virtual straight line (line from T1)
L2: virtual straight line (line from T2)
L3... Bisector line W1... Width of first land surface W11... Width of first area W12... Width of second area W13... Width of third area W2... Width of third area Width of second land surface W21 Width of fourth region W3 Width of third land surface W31 Width of fifth region φ1 Inclination angle of first rake face φ2 Second Inclination angle of rake face φ3...Inclination angle of third rake face φ11...Inclination angle of first part φ12...Inclination angle of second part φ13...Inclination angle of third part φ4... Inclination angle of 4th part φ5・・・Inclination angle of 5th part

Claims (12)

a first face having a first side, a second side, and a first angle located between the first side and the second side;
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 virtual central axis passing through the center of the first surface and the center of the second surface;
a virtual reference plane positioned between the first plane and the second plane and orthogonal to the central axis;
The first surface is
a land surface connected to the third surface and inclined away from the reference surface as the distance from the third surface increases ;
a rake face positioned inside the land surface and inclined away from the reference surface as the distance from the land surface increases;
The land surface is
a first land surface connected to the first corner;
a second land surface connected to the first side;
a third land surface connected to the second side;
The first land surface is
a first region positioned adjacent to the second land surface;
a second region positioned adjacent to the third land surface;
When the first surface is viewed from the front, the width of the first land surface in the second region is larger than the width of the first land surface in the first region, and
The rake face is
a first rake face connected to the first land face;
a second rake face connected to the second land face;
a third rake face connected to the third land face;
The cutting insert, wherein the maximum inclination angle of the first rake face with respect to the reference plane is greater than the maximum inclination angle of the second rake face with respect to the reference plane. The cutting insert according to claim 1, wherein the inclination angle of the first region with respect to the reference plane is the same as the inclination angle of the second region with respect to the reference plane. the first land surface has a third area located on the bisector of the first angle;
When the first surface is viewed from the front, the width of the first land surface in the third region is larger than the width of the first land surface in the first region, and the width of the first land surface in the second region is larger than the width of the first land surface in the second region. 3. The cutting insert according to claim 1 or 2, which is smaller than the width of one land surface. The cutting insert according to claim 3, wherein the width of the first land surface increases from the first area toward the second area when the first surface is viewed from the front. The cutting insert according to claim 3 or 4, wherein the inclination angle of said third region with respect to said reference plane is the same as the inclination angle of said first region with respect to said reference plane. the second land surface has a fourth area extending from a portion adjacent to the first land surface to at least the center of the first side;
The cutting insert according to any one of claims 1 to 5, wherein the width of the second land surface in the fourth region is constant when the first surface is viewed from the front. the third land surface has a fifth area adjacent to the first land surface,
7. The apparatus according to any one of claims 1 to 6, wherein when the first surface is viewed from the front, the width of the third land surface in the fifth region decreases with increasing distance from the first land surface. Cutting insert as described. The first rake face is
a first portion positioned adjacent to the second rake face;
a second portion positioned adjacent to the third rake face;
a third portion located on the bisector of the first angle;
Any one of claims 1 to 7, wherein the inclination angle of the third portion with respect to the reference plane is larger than the inclination angle of the first portion with respect to the reference plane and the inclination angle of the second portion with respect to the reference plane. The cutting insert described in . The second rake face has a fourth portion located adjacent to the first rake face,
9. The cutting insert according to claim 8 , wherein the inclination angle of said fourth portion with respect to said reference plane decreases with increasing distance from said first rake face. The third rake face has a fifth portion located adjacent to the first rake face,
The cutting insert according to claim 8 or 9 , wherein the inclination angle of said fifth portion with respect to said reference plane decreases with increasing distance from said first rake face. a holder having a bar shape extending from a first end toward a second end and having a pocket located on the side of the first end;
a cutting insert according to any one of claims 1 to 10 located in said pocket. rotating a cutting tool according to claim 11 ;
contacting the rotating cutting tool with the work material;
and separating the cutting tool from the work material.

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