WO2019087844A1

WO2019087844A1 - Cutting insert, cutting tool, and method of manufacturing cut workpiece

Info

Publication number: WO2019087844A1
Application number: PCT/JP2018/039171
Authority: WO
Inventors: 義仁池田
Original assignee: 京セラ株式会社
Priority date: 2017-10-30
Filing date: 2018-10-22
Publication date: 2019-05-09
Also published as: JPWO2019087844A1; JP2022065170A; JP7032424B2; JP7304989B2

Abstract

A cutting insert according to one embodiment of the present invention includes a first surface, a second surface, a third surface and a cutting edge. The first surface has a first region and a second region. The first region is positioned along an intersection and includes a flat first planar surface. The second region is positioned further to the inside of the first surface than the first region and is inclined relative to the first region, and includes a flat second planar surface. Furthermore, an arithmetic mean height Sa2 of the second planar surface is greater than an arithmetic mean height Sa1 of the first planar surface.

Description

Cutting insert, cutting tool and method of manufacturing cut product

Cross-reference to related applications

This application claims the priority of Japanese Patent Application No. 2017-208929 filed on October 30, 2017, and the entire disclosure of the prior application is incorporated herein by reference.

This aspect generally relates to a cutting insert used in cutting. More specifically, the present invention relates to a cutting tool made of a material having relatively high hardness, such as PCD and cBN.

As a cutting tool used when cutting a work material such as metal, for example, a cutting insert (throwaway tip) described in JP-A-8-155702 (Patent Document 1) is known. In the cutting insert described in Patent Document 1, the upper surface has a land surface (chamfered portion) located along the cutting edge and a chip breaker located inside the land surface.

In particular, as in the case of the cutting insert described in Patent Document 1, in the case where the portion of the cutting edge is made of an ultra-high hardness sintered body mainly composed of cubic boron nitride (CBN), Land surfaces tend to be set widely. The land surface can be formed, for example, by brush honing, manual operation or blasting.

When the land surface is formed only by honing with a brush or by a manual operation, the surface of the land surface may be rough and the arithmetic average height Sa may be increased. Therefore, the cutting resistance on the land surface may be high, and chipping of the cutting edge may occur. Also, although it is possible to reduce the arithmetic mean height Sa of the land surface only by blasting, in this case, the arithmetic mean height Sa of the chip breaker also becomes smaller. Therefore, there is a possibility that breaking of chips in the chip breaker is insufficient.

The cutting insert according to one aspect has a first surface, a second surface, a third surface and a cutting edge. The second surface is opposite to the first surface. The third surface is located between the first surface and the second surface. The cutting blade is located at least a part of the intersection of the first and third surfaces. The first surface has a first area and a second area. The first region is located along the intersection and includes a flat first plane at least in part. The second region is located on the inner side of the first surface than the first region and is inclined with respect to the first region, and includes a flat second plane at least in part. And arithmetic mean height Sa2 in a 2nd plane is larger than arithmetic mean height Sa1 in a 1st plane.

It is a perspective view showing a cutting insert of an embodiment. It is the front view which looked at the cutting insert shown in FIG. 1 from the side of the 1st surface. It is the side view which looked at the cutting insert shown in FIG. 2 from the A1 direction. It is the side view which looked at the cutting insert shown in FIG. 2 from the A2 direction. It is an enlarged view in area | region B1 shown in FIG. It is sectional drawing of the VI cross section in the cutting insert shown in FIG. It is sectional drawing of the VII cross section in the cutting insert shown in FIG. It is sectional drawing of the VIII cross section in the cutting insert shown in FIG. It is a perspective view showing a cutting tool of an embodiment. It is an enlarged view in area | region B2 shown in FIG. It is the schematic which shows 1 process of the manufacturing method of the cutting material of embodiment. It is the schematic which shows 1 process of the manufacturing method of the cutting material of embodiment. It is the schematic which shows 1 process of the manufacturing method of the cutting material of embodiment.

Hereinafter, cutting inserts 1 (hereinafter, also simply referred to as inserts 1) according to a plurality of embodiments will be described in detail with reference to the drawings. However, for convenience of explanation, the drawings referred to in the following simply show only the main members necessary for describing each embodiment. Thus, the insert 1 may comprise any component not shown in the figures to which it refers. Further, the dimensions of the members in the respective drawings do not faithfully represent the dimensions of the actual constituent members, the dimensional ratio of the respective members, and the like.

<Cutting insert>
The insert 1 of the embodiment has a first surface 3 (upper surface in FIG. 1), a second surface 5 (lower surface in FIG. 1), a third surface 7 (side surface in FIG. 1), and a cutting edge And generally in the shape of a polygonal plate.

The first surface 3 may be a polygon as shown in FIG. The second surface 5 may be located on the opposite side of 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 cutting blade may be located at least a part of the intersection of the first and third surfaces.

The first surface 3 is not limited to a specific shape. The first surface 3 may have, for example, a polygonal shape in a front view. In the insert 1 of the example shown in FIG. 2, the first surface 3 is a rhombus. Therefore, the first surface 3 in the example shown in FIG. 2 has four corners and four sides. At this time, one of the four corners is the first corner 9, and two sides connected to the first corner 9 are the first side 11 and the second side 13. At the outer peripheral edge of the first surface 3, the first corner 9 may be positioned between the first side 11 and the second side 13.

Here, the polygonal shape is not limited to being strictly a polygonal shape. For example, when the first surface 3 is viewed from the front, the four corners of the first surface 3 may be rounded and slightly convex outward. In addition, when the first surface 3 is viewed from the front, the four sides are not limited to the strict linear shape. When the first surface 3 is viewed from the front, these sides may have a shape slightly convex toward the outside or a shape slightly concave.

The second surface 5 may have a polygonal shape, and may have, for example, a rhombus like the first surface 3. In this case, the third surface 7 has four substantially 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 insert 1 of the embodiment, the shapes of the first surface 3 and the second surface 5 are square. However, the shape of the first surface 3 and the second surface 5 may be, for example, a triangle or a hexagon.

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 about 3 mm or more and 20 mm or less. The height from the first surface 3 to the second surface 5 can be set to about 5 mm or more and 20 mm or less.

The insert 1 of the embodiment has a cutting edge 15 located at least a part of the intersection (ridge line) L1 of the first surface 3 and the third surface 7. The cutting blade 15 can be used when cutting a work material. The cutting blade 15 may be located at the entire intersection L1, in other words, the entire outer edge portion of the first surface 3, or may be located at only a part of the intersection L1. In the example shown in FIG. 5, the cutting edge 15 is located at the first corner 9, part of the first side 11, and part of the second side 13.

The first surface 3 has a first area 17 and a second area 19. The first area 17 is located along the intersection L1. At this time, the first region 17 may be in contact with the intersection L1 or may be separated. The first region 17 in the example shown in FIG. 5 is in contact with the intersection L1. The second area 19 is located more inward of the first surface 3 than the first area 17 and is inclined with respect to the first area 17.

The first region 17 has a flat first surface 21. Here, the first plane 21 may be located in the entire first region 17 or may be located in only a part of the first region 17. The second area 19 has a flat second surface 23. The second plane 23 may be located in the entire second region 19 or may be located in only a part of the second region 19.

The first region 17 in the example shown in FIG. 5 is located along the first corner 9, the first side 11 and the second side 13. The first region 17 in the example shown in FIG. 5 has a band-like configuration in which the width in the direction orthogonal to the intersection L1 is narrower than the width in the direction along the intersection L1.

The first region 17 may be at least partially located along the cutting edge 15. The portion of the first region 17 located along the cutting edge 15 can be used as a so-called land surface. When the first region 17 is used as a land surface, the durability of the cutting edge 15 is improved. The first region 17 may be in contact with the cutting edge 15 or may be separated. The first area 17 in the example shown in FIG. 5 is in contact with the cutting edge 15.

Reference numeral O1 shown in FIG. 1 and the like is a central axis passing through the center of the first surface 3 and the center of the second surface 5. Further, reference symbol S shown in FIG. 4 and the like is a virtual plane S which is orthogonal to the central axis O1 and located between the first surface 3 and the second surface 5. The first plane may be parallel to the virtual plane S or may be inclined. The first plane of the example shown in FIGS. 6 to 8 is parallel to the imaginary plane S.

The second area 19 in the insert 1 of the embodiment is inclined with respect to the first area 17. At this time, the second region 19 may be inclined so as to approach the virtual plane S as being away from the first region 17, and is inclined so as to be away from the virtual plane S as being away from the first region 17. It is also good. In the example shown in FIGS. 6 to 8, the second area 19 is inclined so as to approach the virtual plane S as it goes away from the first area 17.

In the insert 1 of the embodiment, the arithmetic average height Sa2 in the second plane 23 is larger than the arithmetic average height Sa1 in the first plane 21. Thus, since arithmetic mean height Sa1 in the 1st plane 21 of the 1st field 17 located along cutting edge 15 is relatively small, cutting resistance at the time of cutting can be made small. Moreover, since arithmetic mean height Sa2 in the 2nd plane 23 of the 2nd field 19 located inside the 1st field 3 rather than the 1st field 17 is relatively large, it is good to the scrap which scrapes the 2nd plane 23 Can be braked.

In order to make the arithmetic mean height Sa2 larger than the arithmetic mean height Sa1, for example, the insert 1 may be manufactured by the following process. However, the means for making the arithmetic mean height Sa2 larger than the arithmetic mean height Sa1 is not limited to the following steps.

First, a molded body to be the insert 1 is prepared. Next, the second flat surface 23 is formed by honing with a brush or manual work. At this time, the brush may contact not only the second plane 23 but also the first plane 21. Next, a protective film is applied on the second flat surface 23 so that the first flat surface 21 is exposed. Next, the first plane 21 is formed by blasting. Next, the protective film is removed. By the above steps, it is possible to make the arithmetic mean height Sa2 larger than the arithmetic mean height Sa1.

Moreover, the order which produces the 1st plane 21 and the 2nd plane 23 may be reverse. First, a molded body to be the insert 1 is prepared. Next, the first plane 21 is formed by blasting. At this time, not only the first flat surface 21 but also the second flat surface 23 may be blasted. Next, a protective film is applied on the first flat surface 21 so that the second flat surface 23 is exposed. Next, the second flat surface 23 is formed by honing with a brush or manual work. Next, the protective film is removed. By the above steps, it is possible to make the arithmetic mean height Sa2 larger than the arithmetic mean height Sa1.

Moreover, when producing the insert 1 by laser processing, it is possible to make arithmetic mean height Sa2 larger than arithmetic mean height Sa1 by adjusting the conditions of a laser. That is, while forming the first plane 21 by irradiating the first laser, and adjusting the conditions of the first laser and the second laser when forming the second plane 23 by irradiating the second laser, Thus, it is possible to make the arithmetic mean height Sa2 larger than the arithmetic mean height Sa1.

In addition, when the insert 1 is manufactured by laser processing, the arithmetic average height Sa2 may be made larger than the arithmetic average height Sa1 by adjusting the moving speed of the laser instead of adjusting the conditions of the laser. Is possible.

Arithmetic mean height Sa is a parameter of the surface property defined in ISO 25178-6: 2010, and is a parameter obtained by extending the arithmetic mean roughness Ra of a line to a surface. Specifically, the arithmetic average height Sa represents the average of the absolute values of the differences in height of each point on the target surface with respect to the average surface of the surface to be measured.

Sa1 and Sa2 are not limited to specific values. For example, Sa1 can be set to about 0.1 to 0.3 μm. Further, Sa2 can be set to about 0.2 to 1 μm.

When Sa1 is 0.1 μm or more, it is easy to apply a suitable brake to the chips. Therefore, it is easy to control the flow of chips in the second plane. When Sa1 is 0.3 μm or less, abrasion of the first flat surface 21 can be easily suppressed. When Sa2 is 0.2 μm or more, the flow of chips can be easily controlled in the second plane. When Sa2 is 1 μm or less, wear of the second flat surface 23 can be easily suppressed.

The arithmetic mean height Sa1 of the first plane 21 may be calculated by measuring the surface shape of the first plane 21 according to the standard of ISO 25178-6: 2010 except that the cutoff value is fixed at 0.03 mm. Good. The arithmetic average height Sa2 of the second plane 23 is calculated by measuring the surface shape of the second plane 23 according to the standard of ISO 25178-6: 2010 except that the cutoff value is fixed to 0.03 mm. do it.

However, the above-mentioned cutoff value is only an example, and may be appropriately set in accordance with an apparatus used for measurement and measurement conditions. The measurement of the surface shape of the first flat surface 21 and the second flat surface 23 may use, for example, a contact-type surface roughness measuring machine using a stylus or an optical non-contact type surface roughness measuring machine.

In addition, that the 1st plane 21 is flat means that the 1st plane 21 is not curving. Therefore, the first plane 21 does not have to be parallel to the virtual plane S, and may be inclined to the virtual plane S. Further, that the second flat surface 23 is flat means that the second flat surface 23 is not curved. Therefore, the second plane 23 also does not have to be parallel to the virtual plane S, and may be inclined to the virtual plane S.

In the example shown in FIGS. 6 to 8, the second area 19 is inclined so as to approach the virtual plane S as it goes away from the first area 17. In other words, the second area 19 is inclined so as to approach the second surface 5 as it is separated from the first area 17.

If the second area 19 is inclined as described above, it is possible to use the second area 19 as a so-called rake face. When the arithmetic mean height Sa2 of the second plane 23 in the second area 19 which can function as a rake face is relatively large, chips are more likely to be collided with the second area 19 and chipping occurs. While difficult, it is possible to brake the chips moderately.

Further, as shown in FIG. 5, the first surface 3 may further include a third region 25 in addition to the first region 17 and the second region 19. The third region 25 in the example shown in FIGS. 6 to 8 is located more inward of the first surface 3 than the second region 19 and is inclined so as to be away from the second surface 5 as it is separated from the second region 19. .

The third area 25 has a flat third surface 27. Here, the third plane 27 may be located in the entire third region 25, or may be located in only a part of the third region 25.

The third area 25 can be used as a so-called breaker wall. If the third area 25 is used as a breaker wall, the chips can be well curved in the third area 25. Therefore, the chips are easily divided into appropriate lengths, and the chip dischargeability is improved.

The surface roughness of the third plane 27 in the third region 25 is not particularly limited. For example, the arithmetic mean height Sa3 in the third plane 27 may be larger than the arithmetic mean height Sa1 in the first plane 21. When the arithmetic mean height Sa3 is relatively large, the chips scraping the third plane 27 can be braked well, so the chips can be easily bent stably.

In particular, when the arithmetic mean height Sa3 in the third plane 27 is larger than the arithmetic mean height Sa2 in the second plane 23, the durability of the insert 1 is improved. When Sa3 is larger than Sa2, excessive braking of the chips in the second plane 23 located closer to the cutting edge 15 than the third plane 27 is avoided. Therefore, the second plane 23 is less likely to be worn, and the chips can be braked in a well-balanced manner in the second plane 23 and the third plane 27.

Sa3 is not limited to a specific value. For example, Sa3 can be set to about 0.2 μm or more and 1 μm or less.

Further, the third region 25 in the example shown in FIGS. 6 to 8 further includes a fourth plane 29. The fourth plane 29 is located farther from the second surface 5 than the third plane 27 and has a flat shape. The arithmetic mean height Sa4 in the fourth plane 29 may be larger than the arithmetic mean height Sa3 in the third plane 27 or may be smaller than the arithmetic mean height Sa3 in the third plane 27.

When the third plane 27 and the fourth plane 29 are used as a breaker wall, and the arithmetic mean height Sa4 in the fourth plane 29 is larger than the arithmetic mean height Sa3 in the third plane 27, the second plane 23 and the third plane 27 And the fourth flat surface 29 can brake the chips in a well-balanced manner.

Arithmetic average height Sa3 of the third plane 27 and arithmetic average height Sa4 of the fourth plane 29 conform to the standard of ISO 25178-6: 2010 except that the cutoff value is fixed at 0.03 mm, the third plane 27. And the fourth surface 29 may be calculated. However, the above-mentioned cutoff value is only an example, and may be appropriately set in accordance with an apparatus used for measurement and measurement conditions.

Also, while the third plane 27 is used as a breaker wall, the fourth plane 29 is used as a plane to control the chip flow direction, and the arithmetic average height Sa4 in the fourth plane 29 is the arithmetic average height in the third plane 27 When it is smaller than Sa3, the chips on which the brake is applied in the second plane 23 and the third plane 27 can flow smoothly in the direction along the fourth plane 29 in the fourth plane 29.

In the example shown in FIGS. 6 to 8, the second area 19 is inclined so as to approach the second surface 5 as it is separated from the first area 17, and as the third area 25 is separated from the second area 19. It is inclined away from the second surface 5. Therefore, a so-called breaker groove is formed by the second area 19 and the third area 25.

In the case where the insert 1 has a breaker groove, chips are easily abraded at the breaker groove. Therefore, the chips are likely to be braked when flowing through the breaker groove, and the direction of flowing when flowing outside the breaker groove is easily controlled.

When the third flat surface 27 is closer to the second surface 5 than the intersection L1, the third flat surface 27 is located inside the breaker groove. Therefore, it is easy to brake the chips in the breaker groove. When the fourth flat surface 29 is located farther from the second surface 5 than the intersection L1, the fourth flat surface 29 is located outside the breaker groove. Therefore, chips tend to flow smoothly in the direction along the fourth plane 29.

The maximum height Sz2 of the second plane 23 may be larger than the maximum height Sz1 of the first plane 21. As described above, in the case where the maximum height Sz1 in the first plane 21 of the first region 17 located along the cutting edge 15 is relatively small, as in the case where the arithmetic average height Sa1 is relatively small, Cutting resistance at the time of cutting can be reduced.

Further, in the case where the maximum height Sz2 in the second plane 23 of the second region 19 located along the cutting edge 15 is relatively large, as in the case where the arithmetic average height Sa2 is relatively large, the second It is possible to brake the chips scraping the plane 23 well.

The maximum height Sz is a parameter of the surface property defined in ISO 25178-6: 2010, and is a parameter obtained by expanding the maximum height Rz of the line to a surface. Specifically, the maximum height Sz represents the maximum value of the absolute value of the difference in height of each point on the target surface with respect to the average surface of the surface to be measured.

Sz1 and Sz2 are not limited to specific values. For example, Sz1 can be set to about 0.5 μm or more and 2.5 μm or less. Further, Sz2 can be set to about 2.2 μm to 20 μm.

The maximum height Sz1 of the first plane 21 may be calculated by measuring the surface shape of the first plane 21 according to the standard of ISO 25178-6: 2010 except that the cutoff value is fixed at 0.03 mm. . Further, the maximum height Sz2 of the second plane 23 is calculated by measuring the surface shape of the second plane 23 according to the standard of ISO 25178-6: 2010 except that the cutoff value is fixed at 0.03 mm. Just do it. However, the above-mentioned cutoff value is only an example, and may be appropriately set in accordance with an apparatus used for measurement and measurement conditions.

Examples of the material of the insert 1 include cemented carbide, cermet, ceramics, PCD (polycrystalline diamond) and cBN (cubic boron nitride).

Examples of the composition of the 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 hard particles, and Co is a binder phase. Also, cermet is a sintered composite material in which a ceramic component is compounded with a metal. Specifically, a compound mainly composed of TiC or TiN (titanium nitride) can be mentioned as the cermet. The material of the insert 1 is not limited to these.

Moreover, the insert 1 may have only one member comprised by the material illustrated above, and may have several members comprised by the material illustrated above.

For example, as shown in FIG. 1, the insert 1 may have a main body portion 31 and a cutting portion 33, and may have a polygonal plate shape as a whole. The main body portion 31 in the example shown in FIG. 1 has a substantially polygonal plate shape and a concave shape in which a part is cut away. The cutting portion 33 may be joined to the notched concave portion using a brazing material or the like.

Here, as in the example shown in FIG. 1, the first corner 9, the first side 11 and the second side 13 may be located in the cutting portion 33. In order to facilitate visual understanding, hatching with oblique lines is added to the portion of the cutting portion 33 in FIG.

The cutting portion 33 may be made of a material having relatively high hardness, such as PCD and cBN, and the main body portion 31 may be made of, for example, cemented carbide, cermet or ceramics. When the main body portion 31 and the cutting portion 33 are made of the above material, the insert 1 can be manufactured at low cost. In addition, the durability of the insert 1 to a cutting load is high. The hardness of the main body portion 31 and the cutting portion 33 may be evaluated by measuring the Vickers hardness of each portion.

Moreover, although the insert 1 may have only the said cutting part 33 and the main-body part 31, in addition to the site | part of the cutting part 33 and the main-body part 31, the coating layer which covers the surface of these sites May be provided. The covering layer may cover the entire surface of the substrate constituted by the cutting portion 33 and the main body portion 31, or may cover only a part of the surface of the substrate.

Examples of the material of the covering layer include aluminum oxide (alumina), and carbides, nitrides, oxides, carbon oxides, nitrogen oxides, carbon nitrides and carbon nitride oxides of titanium. The covering layer may contain only one of the above-mentioned materials, or may contain a plurality.

Moreover, the coating layer may be comprised by only one layer, and the structure by which the several layer was laminated | stacked may be sufficient as it. In addition, as a material of a coating layer, it is not limited to these. The cover layer can be located on the substrate, for example by using a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method.

The insert 1 of the example shown in FIG. 1 has a through hole 35. The through holes 35 in the embodiment are formed from the first surface 3 to the second surface 5 and open in these surfaces. The through hole 35 may extend along a central axis O1 passing through the center of the first surface 3 and the center of the second surface 5.

The through hole 35 may be used to attach a fixing screw or clamp member when holding the insert 1 in the holder. The through holes 35 may be opened in regions opposite to each other in the third surface 7 without any problem.

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

As shown in FIGS. 9 and 10, the cutting tool 101 according to the embodiment includes a holder 105 having a pocket 103 (insert pocket) on the tip end side, and the above insert 1 located in the pocket 103. In the cutting tool 101 of the embodiment, the insert 1 is mounted such that at least a part of the cutting blade protrudes from the tip of the holder 105.

The holder 105 is in the shape of an elongated rod. Then, one pocket 103 is provided on the tip end side of the holder 105. The pocket 103 is a portion to which the insert 1 is attached, and is open to the tip 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 attached. Specifically, the pocket 103 has a seating surface parallel to the lower surface of the holder 105 and a constraining side surface inclined 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 such that at least a portion of the cutting blade protrudes outward from the holder 105. In the example shown in FIG. 10, the insert 1 is attached to the holder 105 by the clamp member 107. The insert 1 may be attached to the holder 105 by inserting the clamp member 107 into the through hole of the insert 1 and fixing the clamp member 107 to the holder 105.

As the holder 105, steel, cast iron or the like can be used. In particular, in order to increase the toughness of the holder 103, steel may be used among these members.

An example cutting tool shown in FIG. 9 is a cutting tool used for so-called turning. Examples of turning include inner diameter machining, outer diameter machining and grooving. The cutting tool is not limited to one used for turning. For example, the insert 1 of the above embodiment may be used for a cutting tool used for milling.

<Method of manufacturing cut product>
Next, the manufacturing method of the cutting material of embodiment is demonstrated using drawing.

The machined product is manufactured by cutting the work material 201. The method of manufacturing a machined product according to the embodiment includes the following steps. That is,
(1) a step of rotating the work material 201;
(2) bringing the cutting material 101 represented by the above-described embodiment into contact with the rotating workpiece 201;
(3) releasing the cutting tool 101 from the work material 201;
Is equipped.

More specifically, first, as shown in FIG. 11, the work material 201 is rotated about the axis O2, and the cutting tool 101 is relatively brought close to the work material 201. Next, as shown in FIG. 12, the cutting edge of the cutting tool 101 is brought into contact with the workpiece 201 to cut the workpiece 201. Then, as shown in FIG. 13, the cutting tool 101 is relatively moved away from the work material 201.

In the example shown in FIG. 11, the cutting tool 101 is moved in the Y1 direction in a state in which the axis O2 is fixed and the work material 201 is rotated, thereby bringing the work material 201 closer. Further, in FIG. 12, the work material 201 is cut by bringing the cutting edge of the cutting tool 101 into contact with the rotating work material 201. Further, in FIG. 13, the cutting tool 101 is moved away in the Y2 direction while rotating the work material 201.

In the cutting process in the manufacturing method of one example shown in FIGS. 11 to 13, the cutting tool 101 is brought into contact with the work material 201 by moving the cutting tool 101 in each process, or the cutting tool 101 is to be machined Although it separates from the cutting material 201, naturally it is not limited to such a form.

For example, in the step (1), the work material 201 may be brought close to the cutting tool 101. Similarly, in the step (3), the work material 201 may be moved away from the cutting tool 101. In the case of continuing the cutting process, the process in which the cutting edge of the cutting tool 101 is brought into contact with different portions of the work material 201 may be repeated while maintaining the state where the work material 201 is rotated.

In addition, as a representative example of the material of the work material 201, carbon steel, alloy steel, stainless steel, cast iron, nonferrous metal etc. are mentioned.

1 ・・・ Cutting insert (insert)
3 ... 1st surface 5 ... 2nd surface 7 ... 3rd surface 9 ... 1st corner 11 ... 1st side 13 ... 2nd side 15 ... cutting edge 17 First area 19 second area 21 first plane 23 second plane 25 second area 27 third plane 29 third plane 29 fourth plane 31 Body part 33: Cutting part 35: Through hole 101: Cutting tool 103: Pocket 105: Holder 107: Fixing screw 201: Material to be cut

Claims

First side,
A second surface located opposite to the first surface;
A third surface located between the first surface and the second surface;
A cutting blade located at least a part of the intersection of the first surface and the third surface;
The first surface is
A first region located along the intersection and having a flat first plane;
And a second area located inside the first surface than the first area and inclined with respect to the first area and having a flat second plane,
A cutting insert, wherein the arithmetic mean height Sa2 in the second plane is larger than the arithmetic mean height Sa1 in the first plane.
The cutting insert according to claim 1, wherein the second area is inclined to approach the second surface as it is separated from the first area.
A third area having a flat third plane, wherein the first surface is located more inward of the first surface than the second region, and is inclined away from the second surface as it is separated from the second region. And have
The cutting insert according to claim 2, wherein the arithmetic mean height Sa3 in the third plane is larger than the arithmetic mean height Sa1 in the first plane.
The cutting insert according to claim 3, wherein the arithmetic mean height Sa3 in the third plane is larger than the arithmetic mean height Sa2 in the second plane.
The third region further includes a flat fourth plane located farther from the second plane than the third plane,
The cutting insert according to claim 3 or 4, wherein the arithmetic mean height Sa3 in the third plane is larger than the arithmetic mean height Sa4 in the fourth plane.
The cutting insert according to claim 5, wherein the fourth plane is located farther from the second plane than the intersection, and the third plane is located closer to the second plane than the intersection.
The cutting insert according to any one of claims 1 to 6, wherein the maximum height Sz2 in the second plane is larger than the maximum height Sz1 in the first plane.
A holder having a pocket located on the tip side,
A cutting tool having a cutting insert according to any one of the preceding claims, located in the pocket.
Rotating the work material;
Contacting the rotating cutting material with the cutting tool according to claim 8;
And moving the cutting tool away from the workpiece.