JPWO2020066958A1 - Manufacturing method for cutting inserts, cutting tools and cutting products - Google Patents

Abstract

The cutting insert of one aspect includes a base portion, a first cutting portion, and a second cutting portion. The base has a first surface having a first angle, a second surface having a second angle, and a third surface, and the second angle is located on the opposite side of the first angle. The first cutting portion has a first secondary surface, a second secondary surface, and a first blade connected to the first corner, and protrudes outward from the base portion. The second cutting portion has a third secondary surface, a fourth secondary surface, and a second blade connected to the second corner, and protrudes outward from the base portion. The first cutting portion is separated from the second surface. The second cutting portion is separated from the first surface.

Description

Cross-reference of related applications

This application claims the priority of Japanese Patent Application No. 2018-182046 filed on September 27, 2018, the entire disclosure of further applications is incorporated herein by reference.

This aspect generally relates to a cutting insert used for cutting a work material. Specifically, it relates to a cutting insert used for turning. More specifically, it relates to a cutting insert used in thread cutting and the like.

As a cutting insert used when thread cutting a work material such as metal, for example, the inserts described in JP-A-2008-254164 (Patent Document 1) and JP-A-2009-539637 (Patent Document 2) are known. Be done. The insert described in Patent Document 1 has a pair of cutting edge portions located at a common edge portion on the front and back surfaces of the insert body and projecting outward when viewed from the direction facing the front and back surfaces. The four projecting surfaces of each of these pair of cutting edge portions facing the front and back surfaces are rake surfaces, and thread cutting blades are formed on the edge portions of these projecting surfaces.

In order to increase the thread thread during thread cutting, it is required to increase the cutting edge portion. However, when the pair of cutting parts is simply enlarged, for example, the cutting parts that are not used in one thread cutting work interfere with the work material among these pair of cutting parts, and the degree of freedom of cutting work is increased. There may be restrictions. Therefore, even in thread cutting with a high thread thread, a cutting insert with few processing restrictions is required.

The cutting insert based on one aspect includes a base portion, a first cutting portion, and a second cutting portion. The base includes a first surface having a first angle, a second surface located on the opposite side of the first surface and having a second angle, and a third surface located between the first surface and the second surface. The second corner is located on the opposite side of the first corner. The first cutting portion includes a first secondary surface connected to the first corner, a second secondary surface connected to the third surface, and a first blade located at the intersection of the first secondary surface and the second secondary surface. , And protrudes outward from the base. The second cutting portion includes a third sub-plane connected to the second corner, a fourth sub-plane connected to the third surface, and a second blade located at the intersection of the third sub-plane and the fourth sub-plane. , And protrudes outward from the base. The first cutting portion is separated from the second surface. The second cutting portion is separated from the first surface.

It is a perspective view which shows the cutting insert of one surface which is not limited in this disclosure. FIG. 5 is a plan view of the cutting insert shown in FIG. 1 as viewed from the side of the first surface. FIG. 5 is a plan view of the cutting insert shown in FIG. 1 as viewed from the side of the second 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. It is an enlarged view in the region B2 shown in FIG. It is an enlarged view in the region B3 shown in FIG. It is an enlarged view in the region B4 shown in FIG. It is sectional drawing of the XX cross section in the cutting insert shown in FIG. 7. FIG. 7 is a cross-sectional view of a cross section of XI-XI in the cutting insert shown in FIG. 7. It is a perspective view which shows the cutting tool of one surface which is not limited in this disclosure. It is an enlarged view in the region B5 shown in FIG. It is the schematic which shows one step of the manufacturing method of the one-sided machined product which is not limited in this disclosure. It is the schematic which shows one step of the manufacturing method of the one-sided machined product which is not limited in this disclosure. It is the schematic which shows one step of the manufacturing method of the one-sided machined product which is not limited in this disclosure.

<Insert>
Hereinafter, the cutting insert 1 of a plurality of embodiments (hereinafter, also simply referred to as an insert 1) will be described in detail with reference to the drawings. However, in each of the figures referred to below, for convenience of explanation, only the main members necessary for explaining each embodiment are shown in a simplified manner. Therefore, the insert 1 may include any component not shown in each of the referenced figures. Further, the dimensions of the members in each drawing do not faithfully represent the actual dimensions of the constituent members, the dimensional ratio of each member, and the like.

The insert 1 illustrated in FIGS. 1 to 11 is a cutting insert that can be used for thread cutting. The insert 1 has a base portion 3, a first cutting portion 5, and a second cutting portion 7, and may have a substantially polygonal plate shape as a whole. Specifically, as shown in FIG. 1, the insert 1 may have a substantially triangular plate shape. The insert 1 is not limited to a triangular plate shape, and may be, for example, a square plate shape or a pentagonal plate shape.

The base 3 may be used as a portion restrained by the holder when the insert 1 is attached to the holder of the cutting tool. The first cutting portion 5 and the second cutting portion 7 may be used as a portion that comes into contact with the work material in the cutting process of the work material and has a main role in the cutting process. The first cutting portion 5 and the second cutting portion 7 do not need to be used at the same time in one cutting process. In other words, either one of the first cutting portion 5 and the second cutting portion 7 may be used in one cutting process.

As in the example shown in FIG. 1, the base portion 3 has a first surface 9, a second surface 11, and a third surface 13, and may have a substantially plate shape. The first surface 9 may have a plurality of corners including the first corner 15 and a plurality of sides as in the example shown in FIG. Each corner on the first surface 9 may be sandwiched between two adjacent sides on the first surface 9. The second surface 11 may be located on the opposite side of the first surface 9. The second surface 11 may have a plurality of corners including the second corner 17 and a plurality of sides as in the example shown in FIG. Each corner on the second surface 11 may be sandwiched between two adjacent sides on the second surface 11.

As in the example shown in FIG. 1, the second angle 17 may be located on the opposite side of the first angle 15. At this time, as shown in FIG. 2, when viewed in a plan view from the side of the first surface 9, at least a part of the first angle 15 may overlap with at least a part of the second angle 17. The third surface 13 may be located between the first surface 9 and the second surface 11. The third surface 13 may be separated from the first surface 9 and the second surface 11, and may be connected to the first surface 9 and the second surface 11 as in the example shown in FIG.

Here, the virtual straight line passing through the center of the first surface 9 and the center of the second surface 11 is defined as the central axis L1. Further, a virtual plane located between the first surface 9 and the second surface 11 and orthogonal to the central axis L1 is designated as the reference surface S1. The reference surface S1 may be positioned so that the distance between the first surface 9 and the second surface 11 is the same.

The base 3 may have through holes 19 that open on the first surface 9 and the second surface 11. The through hole 19 may be used, for example, for inserting a screw when fixing the insert 1 to the holder. The insert 1 can be fixed to the holder by inserting the screw into the through hole 19 and fixing the screw to the holder. The means for fixing the insert 1 to the holder is not limited to screws. For example, the insert 1 may be fixed to the holder using a clamp member.

The through hole 19 may be opened so as to include the center of the first surface 9 and the center of the second surface 11. As in the example shown in FIG. 2, the center of the through hole 19 on the side of the first surface 9 may coincide with the center of the first surface 9. As in the example shown in FIG. 3, the center of the through hole 19 on the side of the second surface 11 may coincide with the center of the second surface 11.

The first cutting portion 5 may have a first secondary surface 21, a second secondary surface 23, and a first blade 25. The first cutting portion 5 may protrude outward from the base portion 3. As in the example shown in FIG. 2, when the first surface 9 is viewed in a plan view, the first cutting portion 5 may project outward from the region where the first angle 15 is located.

The first secondary surface 21 is a surface region corresponding to the first surface 9 of the base portion 3, and may be connected to the first surface 9. The second secondary surface 23 is a surface region corresponding to the third surface 13 of the base portion 3, and may be connected to the third surface 13. The first blade 25 may be located at the intersection of the first secondary surface 21 and the second secondary surface 23. Here, the first blade 25 may be located at the entire intersection of the first secondary surface 21 and the second secondary surface 23, or only a part of the intersection of the first secondary surface 21 and the second secondary surface 23. May be located at.

The work material can be cut by bringing the first blade 25 into contact with the work material. At this time, the first secondary surface 21 may function as a so-called rake surface. Further, the second secondary surface 23 may function as a so-called flank surface.

The first cutting portion 5 may have a shape in which the width becomes narrower as the distance from the base portion 3 increases when the first surface 9 is viewed in a plan view. That is, the intersection of the first secondary surface 21 and the second secondary surface 23 may be V-shaped. Specifically, as in the example shown in FIG. 6, the first blade 25 may have a first tip blade 27, a first straight blade 29, and a second straight blade 31.

As in the example shown in FIG. 7, the first tip blade 27 may have a curved shape that is convex toward the outside. As an example shown in FIG. 7, the first straight blade 29 may have a linear shape extending from the first tip blade 27 toward the first angle 15 at the base 3. As an example shown in FIG. 7, the second straight blade 31 may have a linear shape extending from the first tip blade 27 toward the first angle 15 at the base 3. Here, the bisector at the intersection of the first sub-plane 21 and the second sub-plane 23, which are V-shaped when the first surface 9 is viewed in a plane, is defined as V1.

The first tip blade 27 may be located between the first straight blade 29 and the second straight blade 31. As in the example shown in FIG. 7, when the first surface 9 is viewed in a plan view, the first straight blade 29 may be located closer to the second cutting portion 7 than the second straight blade 31. The distance between the first straight blade 29 and the second straight blade 31 may increase as the distance from the first tip blade 27 increases. Specifically, the distance between the first straight blade 29 and the second straight blade 31 in the direction orthogonal to the bisector V1 may increase as the distance from the first tip blade 27 increases.

In addition to the first tip blade 27, the first straight blade 29, and the second straight blade 31, the first blade 25 includes a first shaving blade 59, a second shaving blade 61, a first curved blade 63, and a second curved blade 65. May further have. The first curved blade 63 may be connected to the first straight blade 29 and may have a concave curved shape when the first surface 9 is viewed in a plan view. The second curved blade 65 may be connected to the second straight blade 31 and may have a concave curved shape when the first surface 9 is viewed in a plan view.

The first laminating blade 59 is connected to the first curved blade 63 and can be used to flatten the top of the thread in thread cutting. The second lapping blade 61 is connected to the second curved blade 65 and can be used to flatten the top of the thread in thread cutting. When the first surface 9 is viewed in a plan view, the first scavenging blade 59 and the second scavenging blade 61 may be located on one straight line.

The second secondary surface 23 may have a flat first region 23a located along the first straight blade 29. Further, the second secondary surface 23 may have a flat second region 23b located along the second straight blade 31. When the second secondary surface 23 has the first region 23a, the durability of the first cutting portion 5 against the cutting load applied to the first straight blade 29 is high. Further, when the second secondary surface 23 has the second region 23b, the durability of the first cutting portion 5 against the cutting load applied to the second straight blade 31 is high.

The second region 23b may be inclined outward as the distance from the second straight blade 31 increases. In this case, the durability of the first cutting portion 5 against the cutting load applied to the second straight blade 31 is further high. As in the example shown in FIG. 9, the second region 23b may be inclined so as to be separated from the second cutting portion 7 as the distance from the second straight blade 31 increases.

The second cutting portion 7 may have a third secondary surface 33, a fourth secondary surface 35, and a second blade 37. The second cutting portion 7 may protrude outward from the base portion 3. As in the example shown in FIG. 3, when the second surface 11 is viewed in a plan view, the second cutting portion 7 may project outward from the region where the second angle 17 is located.

The third secondary surface 33 is a surface region corresponding to the second surface 11 of the base portion 3, and may be connected to the second surface 11. The fourth secondary surface 35 is a surface region corresponding to the third surface 13 of the base portion 3, and may be connected to the third surface 13. The second blade 37 may be located at the intersection of the third secondary surface 33 and the fourth secondary surface 35. Here, the second blade 37 may be located at the entire intersection of the third secondary surface 33 and the fourth secondary surface 35, or only a part of the intersection of the third secondary surface 33 and the fourth secondary surface 35. May be located at.

The work material can be cut by bringing the second blade 37 into contact with the work material. At this time, the third secondary surface 33 may function as a so-called rake surface. Further, the fourth secondary surface 35 may function as a so-called flank.

The second cutting portion 7 may have a shape in which the width becomes narrower as the distance from the base portion 3 increases when the second surface 11 is viewed in a plan view. That is, the intersection of the third secondary surface 33 and the fourth secondary surface 35 may be V-shaped. Specifically, as in the example shown in FIG. 8, the second blade 37 may have a second tip blade 39, a third straight blade 41, and a fourth straight blade 43.

As in the example shown in FIG. 8, the second tip blade 39 may have a curved shape that is convex toward the outside. As an example shown in FIG. 8, the third straight blade 41 may have a linear shape extending from the second tip blade 39 toward the second angle 17 at the base 3. As an example shown in FIG. 8, the fourth straight blade 43 may have a linear shape extending from the second tip blade 39 toward the second angle 17 at the base 3. Here, the bisector at the intersection of the third sub-plane 33 and the fourth sub-plane 35, which are V-shaped when the second surface 11 is viewed in a plane, is defined as V2.

The second tip blade 39 may be located between the third straight blade 41 and the fourth straight blade 43. As in the example shown in FIG. 8, when the second surface 11 is viewed in a plan view, the third straight blade 41 may be located closer to the first cutting portion 5 as compared with the fourth straight blade 43. The distance between the third straight blade 41 and the fourth straight blade 43 may increase as the distance from the second tip blade 39 increases. Specifically, the distance between the third straight blade 41 and the fourth straight blade 43 in the direction orthogonal to the bisector V2 may increase as the distance from the second tip blade 39 increases.

In addition to the second tip blade 39, the third straight blade 41, and the fourth straight blade 43, the second blade 37 includes a third shaving blade 67, a fourth shaving blade 69, a third curved blade 71, and a fourth curved blade 73. May further have. The third curved blade 71 may be connected to the third straight blade 41 and may have a concave curved shape when the second surface 11 is viewed in a plan view. The fourth curved blade 73 may be connected to the fourth straight blade 43 and may have a concave curved shape when the second surface 11 is viewed in a plan view.

The third lapping blade 67 is connected to the third curved blade 71 and can be used to flatten the top of the thread in thread cutting. The fourth lapping blade 69 is connected to the fourth curved blade 73 and can be used to flatten the top of the thread in thread cutting. When the second surface 11 is viewed in a plan view, the third sweeping blade 67 and the fourth sweeping blade 69 may be located on one straight line.

The fourth secondary surface 35 may have a flat third region 35a located along the third straight blade 41. Further, the fourth secondary surface 35 may have a flat fourth region 35b located along the fourth straight blade 43. When the fourth secondary surface 35 has the third region 35a, the durability of the second cutting portion 7 against the cutting load applied to the third straight blade 41 is high. Further, when the fourth secondary surface 35 has the fourth region 35b, the durability of the second cutting portion 7 against the cutting load applied to the fourth straight blade 43 is high.

The fourth region 35b may be inclined outward as the distance from the fourth straight blade 43 increases. In this case, the durability of the second cutting portion 7 against the cutting load applied to the fourth straight blade 43 is further high. As in the example shown in FIG. 6, the fourth region 35b may be inclined so as to be separated from the first cutting portion 5 as the distance from the fourth straight blade 43 increases.

The insert 1 may have a portion other than the first cutting portion 5 and the second cutting portion 7 as a cutting portion. For example, as in the example shown in FIGS. 1 to 3, the insert 1 may have a third cutting portion 45, a fourth cutting portion 47, a fifth cutting portion 49, and a sixth cutting portion 51.

The first cutting portion 5, the third cutting portion 45, and the fourth cutting portion 47 may be positioned so as to overlap each other when the insert 1 is rotated by 120 ° with respect to the central axis L1. The second cutting portion 7, the fifth cutting portion 49, and the sixth cutting portion 51 may be positioned so as to overlap each other when the insert 1 is rotated by 120 ° with respect to the central axis L1.

The first cutting portion 5 and the second cutting portion 7 in the embodiment do not have to be located from the first surface 9 to the second surface 11. Specifically, the first cutting portion 5 may be separated from the second surface 11. Further, the second cutting portion 7 may be separated from the first surface 9. In this case, when cutting is performed using the first blade 25, the second cutting portion 7 is less likely to interfere with the work material. In addition, since the first cutting portion 5 is separated from the second surface 11, the first cutting portion 5 is less likely to interfere with the work material even when cutting is performed using the second blade 37. Therefore, even in thread cutting with a high thread thread, there are few processing restrictions.

Further, when the base portion 3 has the through hole 19 as in the example shown in FIG. 1, the first blade 25, the second blade 37, and the through hole 19 are formed while increasing the size of the first blade 25 and the second blade 37. It is easy to secure a wide interval. Therefore, the durability of the insert 1 is high.

The first blade 25 and the second blade 37 may be positioned so as to intersect each other when viewed in a plane from the side of the first surface 9. When the first blade 25 and the second blade 37 are positioned as described above, the first blade 25 and the second blade 37 can be easily enlarged. Therefore, it is possible to process even higher threads.

When the first blade 25 has the first tip blade 27 and the first straight blade 29, and the second blade 37 has the second tip blade 39 and the third straight blade 41, it is flat from the side of the first surface 9. The first straight blade 29 and the third straight blade 41 may intersect when viewed through.

When the first blade 25 and the second blade 37 are positioned as described above, the distance between the first tip blade 27 and the second tip blade 39 is likely to be appropriately maintained when the first surface 9 is viewed in a plan view. Therefore, when cutting is performed using the first blade 25, the second cutting portion 7 is less likely to interfere with the work material. Further, even when cutting is performed using the second blade 37, the first cutting portion 5 is less likely to interfere with the work material.

The first cutting portion 5 may have a fifth secondary surface 53. As in the example shown in FIG. 10, the fifth sub-plane 53 may be located on the opposite side of the first sub-plane 21. Therefore, the second secondary surface 23 may be located between the first secondary surface 21 and the fifth secondary surface 53. As in the example shown in FIG. 9, since the first cutting portion 5 is separated from the second surface 11, the fifth secondary surface 53 may be separated from the second surface 11.

The fifth secondary surface 53 may approach the first surface 9 as the distance from the base 3 increases. For example, as shown in the cross section shown in FIG. 10, the fifth secondary surface 53 may be inclined upward from the right side where the base portion 3 is located to the left side where the first surface 9 is located. In this case, the durability of the first cutting portion 5 is high when cutting is performed using the first blade 25, and the first cutting portion 5 is used when cutting is performed using the second blade 37. It does not easily interfere with the work material.

Specifically, the portion of the fifth sub-surface 53 that is separated from the base 3 is located closer to the first surface 9 than the portion of the fifth sub-surface 53 that is closer to the base 3, in other words. , May be located away from the second surface 11. In this case, when cutting is performed using the second blade 37, the tip portion of the first cutting portion 5 is less likely to interfere with the work material.

Further, the portion of the fifth sub-surface 53 near the base 3 is located away from the first surface 9 as compared with the portion of the fifth sub-surface 53 that is distant from the base 3, in other words, the second. It may be located near the surface 11. In this case, the durability of the first cutting portion 5 is high when cutting is performed using the first blade 25, and cracks are unlikely to occur in the vicinity of the boundary between the base portion 3 and the first cutting portion 5.

Further, the fifth secondary surface 53 may be separated from the second surface 11 as it approaches the second cutting portion 7. In this case, the first cutting portion 5 is less likely to interfere with the work material when cutting using the second blade 37.

The second cutting portion 7 may have a sixth secondary surface 55. As in the example shown in FIG. 11, the sixth secondary surface 55 may be located on the opposite side of the third secondary surface 33. Therefore, the fourth secondary surface 35 may be located between the third secondary surface 33 and the sixth secondary surface 55. As in the example shown in FIG. 9, since the second cutting portion 7 is separated from the first surface 9, the sixth secondary surface 55 may be separated from the first surface 9.

The sixth secondary surface 55 may approach the second surface 11 as the distance from the base 3 increases. For example, in the cross section shown in FIG. 11, the sixth secondary surface 55 may be inclined downward from the right side where the base portion 3 is located to the left side where the second surface 11 is located. In this case, the durability of the second cutting portion 7 is high when cutting is performed using the second blade 37, and the second cutting portion 7 is used when cutting is performed using the first blade 25. It does not easily interfere with the work material.

Specifically, the portion of the 6th auxiliary surface 55 that is separated from the base 3 is located closer to the 2nd surface 11 than the portion of the 6th auxiliary surface 55 that is closer to the base 3. In other words. , May be located away from the first surface 9. In this case, when cutting is performed using the first blade 25, the tip portion of the second cutting portion 7 is less likely to interfere with the work material.

Further, the portion of the sixth secondary surface 55 near the base 3 is located farther from the second surface 11 as compared with the portion of the sixth auxiliary surface 55 that is separated from the base 3, in other words, the first. It may be located near the surface 9. In this case, the durability of the second cutting portion 7 is high when cutting is performed using the second blade 37, and cracks are unlikely to occur in the vicinity of the boundary between the base portion 3 and the second cutting portion 7.

Further, the sixth secondary surface 55 may be separated from the first surface 9 as it approaches the first cutting portion 5. In this case, the second cutting portion 7 is less likely to interfere with the work material when cutting using the first blade 25.

When the first blade 25 has the first tip blade 27, the first straight blade 29, and the second straight blade 31, the second straight blade 31 may be separated from the second surface 11 from the first straight blade 29. .. When cutting using the first blade 25, the insert 1 may be tilted with respect to the work material in order to prevent the second cutting portion 7 from interfering with the work material.

When the second straight blade 31 is farther from the second surface 11 than the first straight blade 29, the first straight blade 29 and the second straight blade 31 are formed even when the insert 1 is tilted as described above. There is little variation in the cutting load applied to. Therefore, the durability of the insert 1 is high, and the processing accuracy of the work material is also high.

When the second blade 37 has the second tip blade 39, the third straight blade 41, and the fourth straight blade 43, the fourth straight blade 43 may be separated from the first surface 9 from the third straight blade 41. In this case, when cutting is performed using the second blade 37, the variation in the cutting load applied to the third straight blade 41 and the fourth straight blade 43 is small. Therefore, the durability of the insert 1 is high, and the processing accuracy of the work material is also high.

The first surface 9 of the base 3 may be composed of only a flat surface region, or may have a first inclined surface 57 as in the example shown in FIG. The first inclined surface 57 may be located along the first corner 15 and may be inclined so as to move away from the second surface 11 as the distance from the first corner 15 increases. The first inclined surface 57 may function as a so-called breaker wall surface.

When the first surface 9 is viewed in a plan view, the first inclined surface 57 may have a portion 57a having a curved surface shape that is convex toward the first cutting portion 5.

When the first inclined surface 57 has the portion 57a, the traveling direction of the chips is reversed on the first inclined surface 57 when the chips generated by the first blade 25 come into contact with the first inclined surface 57. Then, there is little possibility that chips will advance toward the first blade 25. Therefore, chips are less likely to be clogged. In particular, when the first surface 9 is viewed in a plan view, when at least a part of the portion 57a is located on the bisector V1, the chips are less likely to be clogged.

The size of the insert 1 is not limited to a specific value. For example, when the first surface 9 is viewed in a plan view and the insert 1 has a substantially polygonal shape, the length of one side may be about 10 to 25 mm. Further, the height from the first surface 9 to the second surface 11 may be about 2 to 8 mm.

Examples of the material of the insert 1 include cemented carbide and cermet. Examples of the composition of the cemented carbide include WC-Co, WC-TiC-Co and WC-TiC-TaC-Co. WC-Co is produced by adding cobalt (Co) powder to tungsten carbide (WC) and sintering it. WC-TiC-Co is WC-Co with titanium carbide (TiC) added. WC-TiC-TaC-Co is WC-TiC-Co with tantalum carbide (TaC) added.

Cermet is a sintered composite material in which a metal is composited with a ceramic component. Specifically, examples of the cermet include those containing a titanium compound such as titanium carbide (TiC) or titanium nitride (TiN) as a main component.

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

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

As shown in FIGS. 12 and 13, the cutting tool 101 of the embodiment is a rod-shaped body extending from the first end (lower left end in FIG. 12) to the second end (upper right end in FIG. 12), and is the first rod-shaped body. A holder 105 having a pocket 103 located on the end side and the above-mentioned insert 1 located in the pocket 103 may be provided.

The pocket 103 is a portion on which the insert 1 is mounted, and may have a restraint side surface 107 that abuts on the third surface of the insert 1 and a seating surface 109 that is inclined with respect to the restraint side surface 107. The first surface or the second surface of the insert 1 comes into contact with the seating surface 109. Further, the pocket 103 may be opened on the side of the first end of the holder 105.

The insert 1 is located in the pocket 103. At this time, the base of the insert 1 may be in direct contact with the pocket 103, or the sheet 111 may be sandwiched between the insert 1 and the pocket 103.

The insert 1 is mounted so that at least a part of a portion used as a cutting edge in a cutting portion protrudes outward from the holder 105. The insert 1 may be fixed to the holder 105 by the clamp member 113.

Steel, cast iron, or the like may be used as the member of the holder 105. In particular, when steel is used among these members, the toughness of the holder 105 is high.

<Manufacturing method of machined products>
Next, the method of manufacturing 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. In the embodiment, a process of forming a thread groove is exemplified as a cutting process. The method for producing a machined product in the embodiment may include 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) A process of separating the cutting tool 101 from the work material 201,
May be provided.

More specifically, first, as shown in FIG. 14, the work material 201 is rotated around the axis D in the D1 direction. Further, by moving the cutting tool 101 in the D2 direction, the cutting tool 101 is relatively brought closer to the work material 201. Next, as shown in FIG. 15, the first blade of the cutting tool 101 is brought into contact with the work material 201 to cut the work material 201.

At this time, a screw groove is formed by cutting the work material 201 while moving the cutting tool 1 in the D3 direction. Note that FIG. 15 shows a simplified process of forming a thread groove. As a specific method for forming a thread groove, for example, a processing method such as a radial in-feed or a flank-in feed is known.

Then, as shown in FIG. 16, the cutting tool 101 is moved in the D4 direction to move the cutting tool 101 relatively away from the work material 201.

As shown in FIG. 14, the cutting tool 101 may be brought closer while the shaft D is fixed and the work material 201 is rotated. Further, as shown in FIG. 15, the work material 201 may be cut by bringing the first blade of the cutting insert into contact with the rotating work material 201. Further, as shown in FIG. 16, the cutting tool 101 may be moved away while the work material 201 is rotated.

In the cutting process in the manufacturing method of the embodiment, the cutting tool 101 is brought into contact with the work material 201 by moving the cutting tool 101. Further, by moving the cutting tool 101, the cutting tool 101 is separated from the work material 201. However, the manufacturing method of the embodiment is not limited to such an embodiment.

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 continuing the cutting process, the process of keeping the cutting tool 101 rotated and bringing the cutting insert 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 ... Base 5 ... 1st cutting part 7 ... 2nd cutting part 9 ... 1st surface 11 ... 2nd surface 13 ... 3rd surface 15 ... 1st angle 17・ ・ ・ Second angle L1 ・ ・ ・ Central axis S1 ・ ・ ・ Reference surface 19 ・ ・ ・ Through hole 21 ・ ・ ・ 1st sub surface 23 ・ ・ ・ 2nd sub surface 23a ・ ・ 1st area 23b ・ ・2 areas 25 ... 1st blade 27 ... 1st tip blade 29 ... 1st straight blade 31 ... 2nd straight blade 33 ... 3rd secondary surface 35 ... 4th secondary surface 35a・ ・ 3rd area 35b ・ ・ 4th area 37 ・ ・ ・ 2nd blade 39 ・ ・ ・ 2nd tip blade 41 ・ ・ ・ 3rd straight blade 43 ・ ・ ・ 4th straight blade 45 ・ ・ ・ 3rd cutting part 47 ... 4th cutting part 49 ... 5th cutting part 51 ... 6th cutting part 53 ... 5th auxiliary surface 55 ... 6th auxiliary surface 57 ... 1st inclined surface 57a ...・ Part 59 ・ ・ ・ 1st shaving blade 61 ・ ・ ・ 2nd shaving blade 63 ・ ・ ・ 1st curved blade 65 ・ ・ ・ 2nd curved blade 67 ・ ・ ・ 3rd shaving blade 69 ・ ・ ・ 4th shaving blade 71 ... 3rd curved blade 73 ... 4th curved blade

V1, V2 ... Bisection line 101 ... Cutting tool 103 ... Pocket 105 ... Holder 107 ... Restraint side surface 109 ... Seating surface 111 ... Seat 113 ... Clamp member 201・ ・ ・ Work material

Claims (10)

The first surface with the first corner and
A second surface located on the opposite side of the first surface and having a second angle,
It has a third surface located between the first surface and the second surface, and has.
With a base where the second corner is located on the opposite side of the first corner,
With the first secondary surface connected to the first corner,
The second secondary surface connected to the third surface and
It has a first blade located at the intersection of the first secondary surface and the second secondary surface, and has.
A first cutting portion protruding outward from the base portion and
With the third secondary surface connected to the second corner,
With the fourth secondary surface connected to the third surface,
It has a second blade located at the intersection of the third secondary surface and the fourth secondary surface.
A second cutting portion that protrudes outward from the base portion is provided.
The first cutting portion is separated from the second surface and is separated from the second surface.
The second cutting portion is a cutting insert that is separated from the first surface. The cutting insert according to claim 1, wherein the first blade and the second blade intersect when viewed in a plane from the side of the first surface. The first cutting portion has a fifth secondary surface located on the opposite side of the first secondary surface.
The cutting insert according to claim 1 or 2, wherein the fifth secondary surface approaches the first surface as the distance from the base portion increases. The cutting insert according to claim 3, wherein the fifth secondary surface is separated from the second surface as it approaches the second cutting portion. The first blade
The first tip blade, which has a convex shape from the base to the outside,
A linear first straight blade extending from the first tip blade toward the first corner,
It has a linear second straight blade extending from the first tip blade toward the first angle.
When the first surface is viewed in a plan view, the first straight blade is located closer to the second cutting portion than the second straight blade.
The second blade
The second tip blade, which has a convex shape from the base to the outside,
A linear third straight blade extending from the second tip blade toward the second corner,
It has a linear fourth straight blade extending from the first tip blade toward the first angle.
When the second surface is viewed in a plan view, the third straight blade is located closer to the first cutting portion than the fourth straight blade.
The cutting insert according to any one of claims 1 to 4, wherein the first straight blade and the third straight blade intersect when viewed in a plane from the side of the first surface. The second secondary surface has a flat region located along the second straight blade.
The cutting insert according to claim 5, wherein the region is inclined outward as it moves away from the second straight blade. The cutting insert according to claim 5 or 6, wherein the second straight blade is farther from the second surface than the first straight blade. The first surface has a first inclined surface that is inclined so as to move away from the second surface as the distance from the first angle increases.
When the first surface is viewed in a plan view, the first inclined surface has a portion having a curved surface shape that is convex toward the first cutting portion, according to any one of claims 1 to 7. The cutting insert described. A holder with a pocket located on the side of the first end,
A cutting tool having a cutting insert according to any one of claims 1 to 8 located in the pocket. The process of rotating the work material and
The step of bringing the cutting tool according to claim 9 into contact with the rotating work material, and
A method for manufacturing a work piece, which comprises a step of separating the cutting tool from the work material.

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