JP7032424B2 - Manufacturing method for cutting inserts, cutting tools and cutting materials - Google Patents

Description

Cross-reference of related applications

This application claims the priority of Japanese Patent Application No. 2017-20829 filed on October 30, 2017, and the entire disclosure of further applications is incorporated herein by reference.

This aspect generally relates to a cutting insert used in a cutting process. More specifically, the present invention relates to a cutting tool made of a material having a 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 (throw away insert) described in Japanese Patent Application Laid-Open No. 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 tip breaker located inside the land surface.

In particular, when the cutting edge portion is composed of an ultra-high hardness sintered body containing cubic boron nitride (CBN) as a main component, as in the case of the cutting insert described in Patent Document 1, The land surface tends to be set widely. The land surface can be formed, for example, by brush honing, manual work or blasting.

When the land surface is formed only by honing with a brush or by manual work, the surface of the land surface may become rough and the arithmetic mean height Sa may increase. Therefore, the cutting resistance on the land surface becomes high, and there is a possibility that chipping of the cutting edge may occur. Further, it is possible to reduce the arithmetic average height Sa of the land surface only by the blasting process, but in this case, the arithmetic average height Sa of the chip breaker is also reduced. Therefore, braking of chips in the chip breaker may be insufficient.

The cutting insert according to one embodiment has a first surface, a second surface, a third surface and a cutting edge. The second surface is located on the opposite side of the first surface. The third surface is located between the first and second surfaces. The cutting edge is located at least part of the intersection of the first and third surfaces. The first surface has a first region , a second region, and a third region . The first region is located along the intersection and contains at least a flat first plane. The second region is located inside the first plane with respect to the first region and is inclined with respect to the first region, and further inclined so as to approach the second plane as the distance from the first region increases, at least. It contains a flat second plane in part. The third region is located inside the first plane with respect to the second region and is inclined so as to move away from the second plane as it moves away from the second region, and includes at least a flat third plane. .. Then, the arithmetic mean height Sa2 in the second plane is larger than the arithmetic mean height Sa1 in the first plane. Further, the arithmetic mean height Sa3 in the third plane is larger than the arithmetic mean height Sa2 in the second plane.

It is a perspective view which shows the cutting insert of an embodiment. It is a front view which looked at the cutting insert shown in FIG. 1 from the side of the 1st surface. It is a side view which looked at the cutting insert shown in FIG. 2 from the A1 direction. It is a side view which looked at the cutting insert shown in FIG. 2 from the A2 direction. It is an enlarged view in the region B1 shown in FIG. FIG. 5 is a cross-sectional view of a VI cross section of the cutting insert shown in FIG. FIG. 5 is a cross-sectional view of a VII cross section of the cutting insert shown in FIG. FIG. 5 is a cross-sectional view of a VIII cross section of the cutting insert shown in FIG. It is a perspective view which shows the cutting tool of an embodiment. It is an enlarged view in the area B2 shown in FIG. It is a schematic diagram which shows one process of the manufacturing method of the machined work of embodiment. It is a schematic diagram which shows one process of the manufacturing method of the machined work of embodiment. It is a schematic diagram which shows one process of the manufacturing method of the machined work of embodiment.

Hereinafter, a plurality of embodiments of the cutting insert 1 (hereinafter, also simply referred to as the insert 1) will be described in detail with reference to the drawings. However, each figure referred to below is shown in a simplified manner only for the main members necessary for explaining each embodiment for convenience of explanation. Therefore, the insert 1 may include any component not shown in each referenced figure. Further, the dimensions of the members in each drawing do not faithfully represent the dimensions of the actual constituent members, the dimensional ratio of each member, 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. It has a generally polygonal plate shape.

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. As shown in FIG. 1, the third surface 7 may be located between the first surface 3 and the second surface 5. The cutting edge may be located at least 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 a polygonal shape, for example, when viewed from the front. In the example insert 1 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 the two sides connected to the first corner 9 are the first side 11 and the second side 13. The first corner 9 may be located on the outer peripheral edge of the first surface 3 so as to be sandwiched between the first side 11 and the second side 13.

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

The second surface 5 may have a polygonal shape, and may be, for example, a rhombus like the first surface 3. In this case, the third surface 7 has four planes that are generally flat and four curved surfaces that connect these planes.

The shapes of the first surface 3 and the second surface 5 are not limited to the above-mentioned form. In one insert 1 of the embodiment, the shapes of the first surface 3 and the second surface 5 are quadrangular. However, the shapes 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. Further, 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 edge 15 can be used when cutting a work material. The cutting edge 15 may be located on the entire intersection L1, in other words, on the entire outer edge portion of the first surface 3, or may be located only on a part of the intersection L1. In the example shown in FIG. 5, the cutting edge 15 is located in the first corner 9, a part of the first side 11, and a part of the second side 13.

The first surface 3 has a first region 17 and a second region 19. The first region 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 from the first region 17. The first region 17 in the example shown in FIG. 5 is in contact with the intersection L1. The second region 19 is located inside the first surface 3 with respect to the first region 17 and is inclined with respect to the first region 17.

The first region 17 has a flat first plane 21. Here, the first plane 21 may be located in the entire first region 17, or may be located only in a part of the first region 17. The second region 19 has a flat second plane 23. The second plane 23 may be located in the entire second region 19, or may be located only in 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. Further, the first region 17 in the example shown in FIG. 5 has a band-like structure 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 from the cutting edge 15. The first region 17 in the example shown in FIG. 5 is in contact with the cutting edge 15.

Reference numeral O1 shown in FIG. 1 or the like is a central axis passing through the center of the first surface 3 and the center of the second surface 5. Further, the reference numeral S shown in FIG. 4 and the like is a virtual plane S 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 virtual plane S.

The second region 19 in the insert 1 of the embodiment is inclined with respect to the first region 17. At this time, the second region 19 may be inclined so as to approach the virtual plane S as the distance from the first region 17 increases, or the second region 19 may be inclined so as to move away from the virtual plane S as the distance from the first region 17 increases. May be good. In the example shown in FIGS. 6 to 8, the second region 19 is inclined so as to approach the virtual plane S as the distance from the first region 17 increases.

In the insert 1 of the embodiment, the arithmetic mean height Sa2 on the second plane 23 is larger than the arithmetic mean height Sa1 on the first plane 21. As described above, since the arithmetic mean height Sa1 in the first plane 21 of the first region 17 located along the cutting edge 15 is relatively small, the cutting resistance during cutting can be reduced. Further, since the arithmetic mean height Sa2 in the second plane 23 of the second region 19 located inside the first surface 3 is relatively larger than that of the first region 17, it is good for chips that scrape the second plane 23. Can be braked.

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

First, a molded body to be the insert 1 is prepared. Next, the second plane 23 is formed by honing with a brush or by hand. At this time, the brush may come into contact with not only the second plane 23 but also the first plane 21. Next, a protective film is attached on the second plane 23 so that the first plane 21 is exposed. Next, the first plane 21 is formed by blasting. Next, the protective film is removed. By the above steps, the arithmetic average height Sa2 can be made larger than the arithmetic average height Sa1.

Further, the order in which the first plane 21 and the second plane 23 are created may be reversed. 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 plane 21 but also the second plane 23 may be blasted. Next, a protective film is attached on the first plane 21 so that the second plane 23 is exposed. Next, the second plane 23 is formed by honing with a brush or by hand. Next, the protective film is removed. By the above steps, the arithmetic average height Sa2 can be made larger than the arithmetic average height Sa1.

Further, when the insert 1 is manufactured by laser processing, the arithmetic average height Sa2 can be made larger than the arithmetic average height Sa1 by adjusting the laser conditions. That is, the conditions of the first laser and the second laser are adjusted when the first plane 21 is formed by irradiating the first laser and the second plane 23 is formed by irradiating the second laser. Therefore, it is possible to make the arithmetic mean height Sa2 larger than the arithmetic average height Sa1.

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

The arithmetic mean height Sa is a parameter of the surface texture defined in ISO25178-6: 2010, and is a parameter obtained by extending the arithmetic average roughness Ra of the line to the surface. Specifically, the arithmetic mean 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 an appropriate brake to the chips. Therefore, it is easy to control the flow of chips on the second plane. When Sa1 is 0.3 μm or less, it is easy to suppress the wear of the first flat surface 21. Further, when Sa2 is 0.2 μm or more, it is easy to control the flow of chips on the second plane. When Sa2 is 1 μm or less, it is easy to suppress the wear of the second flat surface 23.

The arithmetic mean height Sa1 of the first plane 21 can be calculated by measuring the surface shape of the first plane 21 according to the standard of ISO25178-6: 2010 except that the cutoff value is fixed at 0.03 mm. good. The arithmetic mean height Sa2 of the second plane 23 is calculated by measuring the surface shape of the second plane 23 according to the standard of ISO25178-6: 2010 except that the cutoff value is fixed at 0.03 mm. do it.

However, the above cutoff value is only an example, and may be appropriately set according to the apparatus used for the measurement and the measurement conditions. For the measurement of the surface shapes of the first plane 21 and the second plane 23, for example, a contact type surface roughness measuring machine using a stylus or an optical non-contact type surface roughness measuring machine may be used.

The fact that the first plane 21 is flat means that the first plane 21 is not curved. Therefore, the first plane 21 does not have to be parallel to the virtual plane S and may be inclined with respect to the virtual plane S. Further, the fact that the second plane 23 is flat means that the second plane 23 is not curved. Therefore, the second plane 23 does not have to be parallel to the virtual plane S, and may be inclined with respect to the virtual plane S.

In the example shown in FIGS. 6 to 8, the second region 19 is inclined so as to approach the virtual plane S as the distance from the first region 17 increases. In other words, the second region 19 is inclined so as to approach the second surface 5 as the distance from the first region 17 increases.

When the second region 19 is inclined as described above, the second region 19 can be used as a so-called rake face. When the arithmetic mean height Sa2 of the second plane 23 in the second region 19 capable of functioning as a rake face is relatively large, it is easy to prevent chips from colliding with the second region 19 and chipping occurs. While difficult, it can brake against chips moderately.

Further, as shown in FIG. 5, the first surface 3 may further have 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 inside the first surface 3 with respect to the second region 19 and is inclined so as to move away from the second surface 5 as the distance from the second region 19 increases. ..

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

The third region 25 can be used as a so-called breaker wall. When the third region 25 is used as a breaker wall, chips can be satisfactorily curved in the third region 25. Therefore, the chips are easily separated by an appropriate length, and the dischargeability of the chips 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 on the third plane 27 may be larger than the arithmetic mean height Sa1 on the first plane 21. When the arithmetic mean height Sa3 is relatively large, the chips scraping the third plane 27 can be satisfactorily braked, so that the chips can be easily curved stably.

In particular, when the arithmetic mean height Sa3 on the third plane 27 is larger than the arithmetic average height Sa2 on the second plane 23, the durability of the insert 1 is improved. When Sa3 is larger than Sa2, it is possible to avoid excessive braking of chips on the second plane 23 located closer to the cutting edge 15 than the third plane 27. Therefore, the second flat surface 23 is less likely to be worn, and the chips can be braked in a well-balanced manner on the second flat surface 23 and the third flat surface 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 has a fourth plane 29. The fourth plane 29 is located farther from the second plane 5 than the third plane 27 and has a flat shape. The arithmetic mean height Sa4 on the fourth plane 29 may be larger than the arithmetic mean height Sa3 on the third plane 27, or may be smaller than the arithmetic average height Sa3 on the third plane 27.

When the third plane 27 and the fourth plane 29 are used as breaker walls and the arithmetic average height Sa4 in the fourth plane 29 is larger than the arithmetic average height Sa3 in the third plane 27, the second plane 23 and the third plane 27 And the brake can be applied to the chips in a well-balanced manner on the fourth plane 29.

The arithmetic average height Sa3 of the third plane 27 and the arithmetic average height Sa4 of the fourth plane 29 conform to the standard of ISO25178-6: 2010 except that the cutoff value is fixed at 0.03 mm, and the third plane 27 And it may be calculated by measuring the surface shape of the fourth plane 29. However, the above cutoff value is only an example, and may be appropriately set according to the apparatus used for the measurement and the measurement conditions.

Further, while the third plane 27 is used as a breaker wall, the fourth plane 29 is used as a surface for controlling the flow direction of chips, and the arithmetic average height Sa4 on the fourth plane 29 is the arithmetic average height on the third plane 27. When it is smaller than Sa3, the chips braked on the second plane 23 and the third plane 27 tend to flow smoothly in the direction along the fourth plane 29 on the fourth plane 29.

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

When the insert 1 has a breaker groove, chips are easily scraped in the breaker groove. Therefore, the chips are likely to be braked when flowing through the breaker groove, and the direction of flow when flowing outside the breaker groove is easily controlled.

When the third plane 27 intersects and is located closer to the second plane 5 than L1, the third plane 27 is located in the breaker groove. Therefore, the brake is likely to be applied to the chips in the breaker groove. Further, when the fourth plane 29 intersects and is located farther from the second plane 5 than L1, the fourth plane 29 is located outside the breaker groove. Therefore, the chips tend to flow smoothly in the direction along the fourth plane 29.

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

Further, when the maximum height Sz2 in the second plane 23 of the second region 19 located along the cutting edge 15 is relatively large, the second arithmetic mean height Sa2 is relatively large as in the case where the arithmetic average height Sa2 is relatively large. The chips that scrape the flat surface 23 can be satisfactorily braked.

The maximum height Sz is a parameter of surface texture defined in ISO25178-6: 2010, and is a parameter obtained by extending the maximum height Rz of a 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 or more and 20 μm or less.

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 ISO25178-6: 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 ISO25178-6: 2010 except that the cutoff value is fixed at 0.03 mm. Just do it. However, the above cutoff value is only an example, and may be appropriately set according to the apparatus used for the measurement and the measurement conditions.

Examples of the material of the insert 1 include cemented carbide, cermet, ceramics, PCD (polycrystal 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 bound phase. Cermet is a sintered composite material in which a metal is composited with a ceramic component. Specifically, examples of the cermet include compounds containing TiC or TiN (titanium nitride) as a main component. The material of the insert 1 is not limited to these.

Further, 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, as shown in FIG. 1, the insert 1 has 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 has a concave shape in which a part is cut out. The cutting portion 33 may be joined to the notched concave portion by 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 at the cutting portion 33. In addition, in order to facilitate visual understanding, hatching by diagonal lines is added to the portion of the cutting portion 33 in FIG. 1.

The cutting portion 33 may be made of a material having a 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 materials, the insert 1 can be manufactured at low cost. In addition, the durability of the insert 1 against 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.

Further, the insert 1 may have only the above-mentioned cutting portion 33 and the main body portion 31, but for example, in addition to the portions of the cutting portion 33 and the main body portion 31, a coating layer covering the surface of these portions. May be provided. The coating layer may cover the entire surface of the substrate composed of 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 coating layer include aluminum oxide (alumina), and carbides, nitrides, oxides, carbon oxides, nitrides, carbonitrides, and carbon dioxide oxides of titanium. The coating layer may contain only one of the above materials, or may contain a plurality of the above materials.

Further, the covering layer may be composed of only one layer, or may be a structure in which a plurality of layers are laminated. The material of the coating layer is not limited to these. The coating 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 hole 35 in the embodiment is formed from the first surface 3 to the second surface 5, and is open in these surfaces. The through hole 35 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 hole 35 may be used to attach a fixing screw or a clamp member when holding the insert 1 in the holder. It should be noted that there is no problem even if the through hole 35 is configured to open in a region located on the opposite side of the third surface 7.

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

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

The holder 105 has an elongated rod shape. 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 mounted and is open to the tip 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 the sheet may be sandwiched between the insert 1 and the pocket 103.

The insert 1 is mounted so that at least a part of the cutting edge 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 mounted on 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, from the viewpoint of increasing the toughness of the holder 103, steel may be used among these members.

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

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

The work piece is produced by cutting the work material 201. The method for manufacturing a machined product according to an embodiment includes the following steps. That is,
(1) The process of rotating the work material 201 and
(2) A step of bringing the cutting tool 101 represented by the above embodiment into contact with the rotating work material 201, and
(3) The process of separating the cutting tool 101 from the work material 201,
It is equipped with.

More specifically, first, as shown in FIG. 11, the work material 201 is rotated around the shaft O2, and the cutting tool 101 is relatively 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 work material 201 to cut the work material 201. Then, as shown in FIG. 13, the cutting tool 101 is relatively far from the work material 201.

In the example shown in FIG. 11, the cutting tool 101 is moved in the Y1 direction while the shaft O2 is fixed and the work material 201 is rotated to bring the work material 201 closer to the work material 201. 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 the work material 201 is rotated.

In the cutting process in the manufacturing method of the example shown in FIGS. 11 to 13, the cutting tool 101 is brought into contact with the work material 201 or the cutting tool 101 is covered by moving the cutting tool 101 in each step. Although it is separated from the cutting material 201, it is not limited to such a form as a matter of course.

For example, in the step (1), the work material 201 may be brought closer to the cutting tool 101. Similarly, in the step (3), the work material 201 may be moved away from the cutting tool 101. When the cutting process is continued, the process of keeping the work material 201 rotated and bringing the cutting edge of the cutting tool 101 into contact with different parts of the work material 201 may be repeated.

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

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 ...・ ・ 1st area 19 ・ ・ ・ 2nd area 21 ・ ・ ・ 1st plane 23 ・ ・ ・ 2nd plane 25 ・ ・ ・ 3rd area 27 ・ ・ ・ 3rd plane 29 ・ ・ ・ 4th plane 31 ・ ・・ Main body 33 ・ ・ ・ Cutting part 35 ・ ・ ・ Through hole 101 ・ ・ ・ Cutting tool 103 ・ ・ ・ Pocket 105 ・ ・ ・ Holder 107 ・ ・ ・ Fixing screw 201 ・ ・ ・ Work material

Claims (6)

The first side and
The second surface located on the opposite side of the first surface and
A third surface located between the first surface and the second surface,
It has a cutting edge 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,
A flat second plane that is located inside the first surface of the first region and is inclined with respect to the first region, and further inclined toward the second surface as the distance from the first region increases. The second region with
It has a third region that is located inside the first plane of the second region and is inclined away from the second plane as it moves away from the second plane and has a flat third plane .
The arithmetic mean height Sa2 in the second plane is larger than the arithmetic mean height Sa1 in the first plane.
A cutting insert in which 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 comprises a flat fourth plane located farther from the second plane than the third plane.
The cutting insert according to claim 1 , 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 2 , 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 3 , wherein the maximum height Sz2 in the second plane is larger than the maximum height Sz1 in the first plane. A holder with a pocket located on the tip side,
A cutting tool having the cutting insert according to any one of claims 1 to 4 , located in the pocket. The process of rotating the work material and
The step of bringing the cutting tool according to claim 5 into contact with the rotating work material, and
A method for manufacturing a machined product, comprising a step of separating the cutting tool from the work material.

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