Storage case and insert set

Abstract

For the automation of work to replace a cutting insert, the present invention efficiently performs a process for extracting the cutting insert by using a robot arm. This storage case includes a bottom wall, a frame-shaped peripheral wall that stands upright on the outer peripheral edge of the bottom wall, a storage part that is located inward of the peripheral wall, and a projecting part that is located in the storage part. The projecting part is shaped as a polygonal column.

Description

Storage case and insert set

[0001] The present disclosure relates to a storage case for storing cutting inserts, and an insert set in which cutting inserts are stored in the storage case.

[0002] Cutting inserts used in metal processing are generally distributed on the market in a storage case in order to reduce breakage of the inserts. Known storage cases for cutting inserts include those described in Patent Documents 1 and 2. The storage cases described in Patent Documents 1 and 2 have multiple storage compartments for storing the cutting inserts.

[0003] Publication No. 3005108 Publication No. 05-071186

[0004] A storage case according to one aspect of the present disclosure is a storage case for storing cutting inserts, and includes a bottom wall, a frame-shaped peripheral wall rising from an outer peripheral edge of the bottom wall, a storage section located inside the peripheral wall for storing the cutting insert, and a protrusion located in the storage section and protruding from the bottom wall. The protrusion has a polygonal column shape.

[0005] An insert set according to an aspect of the present disclosure includes a cutting insert having a through hole and a storage case according to an aspect of the present disclosure for storing the cutting insert. At least a portion of the through hole has a polygonal prism shape, and a protrusion is inserted into the through hole. Contact between the outer peripheral surface of the protrusion and the inner peripheral surface of the through hole restricts rotation of the cutting insert around the central axis of the through hole.

[0006] 7 is a schematic perspective view of an insert set according to an example of the present disclosure, showing a state in which the lid body has been removed from the case body. FIG. 8 is a schematic perspective view of a storage case according to an example of the present disclosure, showing a state in which the lid body has been removed from the case body. FIG. 9 is a schematic perspective view of a cutting insert according to an example of the present disclosure. FIG. 10 is a schematic view of a cutting insert according to an example of the present disclosure, seen from the top side. FIG. 11 is a schematic view of an insert set according to an example of the present disclosure, seen from the opening side of the case body. FIG. 12 is a schematic enlarged cross-sectional view taken along line VII-VII in FIG. 5. FIG. 13 is a schematic cross-sectional view taken along line VIII-VIII in FIG.

[0007] When a cutting insert wears out and reaches the end of its life, a replacement operation is performed in which the used cutting insert is removed from a holder of a cutting tool and a new cutting insert is attached to the holder. Conventionally, the replacement operation of cutting inserts has been performed manually by a person (worker), but in recent years, with the automation of factory operations as part of so-called smart factories, there has been an increasing demand for automation of the replacement operation of cutting inserts.

[0008] In automating the cutting insert replacement process, an efficient process for removing the cutting insert from the storage case by the robot arm is a challenge. If the position and orientation of the cutting insert in the storage section of the storage case are irregular, it is necessary to identify the position and orientation of the cutting insert in the storage section of the storage case by, for example, image recognition and make corrections to the drive of the robot arm.

[0009] The insert set, cutting insert, and storage case according to the present disclosure will be described in detail below with reference to the drawings. However, for the sake of convenience, the figures referred to below show only the components necessary for explaining the embodiments in a simplified form. Therefore, the insert set, cutting insert, and storage case according to the present disclosure may include any components not shown in the figures referred to. Furthermore, the dimensions of the components in the figures do not faithfully represent the actual dimensions of the components or the dimensional ratios of each member.

[0010] In this disclosure, the width direction refers to the width direction of the insert set or storage case, and is synonymous with the horizontal direction. The length direction refers to the length direction of the insert set or storage case, and is synonymous with the vertical direction. In the drawings, "WD" refers to the width direction, "LD" refers to the length direction, "LDa" refers to the first side in the length direction, "LDb" refers to the second side opposite to the first side in the length direction, "HD" refers to the up-down direction, "HDa" refers to the upper side or upward direction, and "HDb" refers to the lower side or downward direction.

[0011] An insert set 10 and a cutting insert 12 according to an example of the present disclosure will be described with reference to Figures 1 to 4. Figure 1 is a schematic perspective view of the insert set 10 according to an example of the present disclosure, showing a state in which the lid body 44 has been removed from the case body 28. Figure 2 is a schematic perspective view of the storage case 16 according to an example of the present disclosure, showing a state in which the lid body 44 has been removed from the case body 28. Figure 3 is a schematic perspective view of the cutting insert 12 according to an example of the present disclosure. Figure 4 is a schematic view of the cutting insert 12 according to an example of the present disclosure, viewed from the top surface 18 side.

[0012] 1 and 2 , an insert set 10 according to an example of the present disclosure may include a plurality of cutting inserts 12 for cutting a workpiece made of metal or the like, and the cutting inserts 12 may have through holes 14. The cutting inserts 12 may be attached to pockets of a holder when cutting a workpiece. The cutting inserts 12 may be attached to the pockets of the holder by tightening fixing screws inserted into the through holes 14. The insert set 10 may also include a storage case 16 for storing the plurality of cutting inserts 12.

[0013] As shown in the examples of Figures 3 and 4, the cutting insert 12 may have a rectangular upper surface 18 and a rectangular lower surface 20 located opposite the upper surface 18. The upper surface 18 and the lower surface 20 may each have a polygonal shape other than a rectangular shape, such as a triangular shape. The term "rectangular shape" is not limited to a rectangular shape in the strict sense, but includes a shape that can be visually recognized as a rectangular shape overall. The term "polygonal shape" is not limited to a polygonal shape in the strict sense, but includes a shape that can be visually recognized as a polygonal shape overall.

[0014] The cutting insert 12 may have a side surface 22 located between the upper surface 18 and the lower surface 20. The side surface 22 may be connected to the upper surface 18 and the lower surface 20. The side surface 22 may function as a clearance surface and may be parallel to the central axis 14c of the through hole 14. The cutting insert 12 may be a so-called negative type cutting insert having a clearance angle of 0 degrees.

[0015] The through hole 14 of the cutting insert 12 may extend from the upper surface 18 to the lower surface 20. A first end of the through hole 14 may open at the center of the upper surface 18. A second end of the through hole 14, which is opposite to the first end, may open at the center of the lower surface 20.

[0016] The cutting insert 12 may have an upper cutting edge 24 located on the outer periphery of the upper surface 18, where the upper surface 18 and the side surface 22 intersect. The cutting insert 12 may have a lower cutting edge 26 located on the outer periphery of the lower surface 20, where the lower surface 20 and the side surface 22 intersect. In other words, the cutting insert 12 may be a double-sided insert having an upper cutting edge 24 and a lower cutting edge 26. The upper cutting edge 24 may be located on the entire outer periphery of the upper surface 18, or may be located on a portion of the outer periphery of the upper surface 18. The lower cutting edge 26 may be located on the entire outer periphery of the lower surface 20, or may be located on a portion of the outer periphery of the lower surface 20.

[0017] When cutting is performed by the upper cutting edge 24, a portion of the upper surface 18 may function as a rake surface, and the lower surface 20 may function as a seating surface for attachment to a pocket of a holder. When cutting is performed by the lower cutting edge 26, a portion of the lower surface 20 may function as a rake surface, and the upper surface 18 may function as a seating surface.

[0018] Examples of the material of the cutting insert 12 include cemented carbide and cermet. Examples of cemented carbide compositions include WC-Co, which is produced by adding cobalt (Co) powder to tungsten carbide (WC) and sintering the mixture; WC-TiC-Co, which is produced by adding titanium carbide (TiC) to WC-Co; and WC-TiC-TaC-Co, which is produced by adding tantalum carbide (TaC) to WC-TiC-Co. Cermet is a sintered composite material in which a ceramic component is combined with a metal, and specific examples include sintered composite materials whose main component is a titanium compound such as titanium carbide (TiC) or titanium nitride (TiN).

[0019] The surface of the cutting insert 12 may be coated with a film by chemical vapor deposition (CVD) or physical vapor deposition (PVD). The film may have a composition of titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), or alumina (Al ２ O ３ ) etc.

[0020] A storage case 16 according to an example of the present disclosure will be described with reference to Figures 1, 2, and 5 to 8. Figure 5 is a schematic diagram of an insert set 10 according to an example of the present disclosure, viewed from the opening 28a side of the case body 28. Figure 6 is a schematic diagram of a storage case 16 according to an example of the present disclosure, viewed from the opening 28a side of the case body 28. Figure 7 is a schematic enlarged cross-sectional view taken along line VII-VII in Figure 5. Figure 8 is a schematic cross-sectional view taken along line VIII-VIII in Figure 7.

[0021] As shown in the examples in FIGS. 1 , 2 , 5 , and 6 , the storage case 16 may include a box-shaped case body 28, which may have a rectangular opening 28a on its upper surface. Examples of materials for the case body 28 include hard resins such as polypropylene and polyethylene terephthalate. The case body 28 may have a rectangular bottom wall 30 and a rectangular frame-shaped peripheral wall 32 rising from the outer periphery of the bottom wall 30. The peripheral wall 32 may have a pair of first side walls 34 extending in the width direction and facing each other in the length direction, and a pair of second side walls 36 extending in the length direction and facing each other in the width direction. Instead of forming the peripheral wall 32 in a rectangular frame shape, the peripheral wall 32 may have a frame shape other than a rectangular frame shape, such as a triangular frame shape.

[0022] The first side wall 34a located on the first side in the longitudinal direction and the pair of second side walls 36 may each protrude upward relative to the upper end surface of the first side wall 34b located on the second side in the longitudinal direction. The first side wall 34a located on the first side in the longitudinal direction may have, at its upper end, a plurality of first protruding pieces 34f protruding inward from the peripheral wall 32. The plurality of first protruding pieces 34f may be positioned at intervals in the width direction. The pair of second side walls 36 may have, at their respective upper ends, a plurality of second protruding pieces 36f protruding inward from the peripheral wall 32. The plurality of second protruding pieces 36f may be positioned at intervals in the longitudinal direction.

[0023] The case body 28 may have a plurality of first partition walls 38 located inside the peripheral wall 32 and extending in the width direction. The plurality of first partition walls 38 may be located at intervals in the length direction, and the lower ends of the first partition walls 38 may be connected to the bottom wall 30. The case body 28 may also have a second partition wall 40 located inside the peripheral wall 32 and extending in the length direction. The second partition wall 40 may be located inside the peripheral wall 32 so as to vertically traverse the plurality of first partition walls 38. The lower ends of the second partition walls 40 may be connected to the bottom wall 30. The plurality of first partition walls 38 and second partition walls 40 may be located in a lattice pattern inside the peripheral wall 32.

[0024] The inside of the peripheral wall 32 may be partitioned into a plurality of storage sections (storage spaces) 28s for storing the cutting inserts 12 by a plurality of first partition walls 38 and a plurality of second partition walls 40. In other words, the case body 28 may have a plurality of storage sections 28s located inside the peripheral wall 32.

[0025] The case body 28 may have protrusions 42 in the shape of regular octagonal prisms that are located in each storage section 28s and protrude upward from the bottom wall 30. Instead of making each protrusion 42 into a regular octagonal prism shape, it may also be made into a regular polygonal prism shape other than a regular octagonal prism, such as a regular square prism or a regular pentagonal prism. Instead of making each protrusion 42 into a regular polygonal prism shape, it may also be made into a polygonal prism shape other than a regular polygonal prism.

[0026] The polygonal prism shape described above is not limited to a strict meaning, and may be a polygonal prism shape from a macroscopic viewpoint. For example, the corners of the polygonal end faces may be slightly rounded. Furthermore, the sides of the polygonal end faces may have some irregularities.

[0027] Furthermore, the regular polygonal prism shape described above is not limited to a strict meaning, and may be a roughly regular polygonal prism shape from a macroscopic perspective. For example, the interior angles of the corners of the regular polygonal end face do not have to be strictly constant, and may have a slight variation of about ±5°. Furthermore, the lengths of the sides of the polygonal end face do not have to be strictly constant. The shortest side of the polygonal end face may be about 95% of the longest side.

[0028] The position of the protrusion 42 in each storage section 28s is not limited to a specific configuration. As a non-limiting example shown in Fig. 6, the protrusion 42 may be located at the center of each storage section 28s when viewed from above. In this case, when the cutting insert 12 is stored in the storage case 16, the cutting insert 12 is less likely to come into contact with the peripheral wall 32, the first partition wall 38, and the second partition wall 40, and the storage case 16 is less likely to be damaged.

[0029] Furthermore, when storing the cutting insert 12 in the storage case 16, the cutting insert 12 is less likely to come into contact with the peripheral wall 32, the first partition wall 38, and the second partition wall 40, so the storage operation can be performed stably. The protrusion 42 being located at the center of the storage section 28s means that the center of gravity of the storage section 28s overlaps with the protrusion 42 when viewed from above. When the storage section 28s is rectangular, the center of the storage section 28s may be the intersection of diagonals of the storage section 28s.

[0030] As shown in the example in FIGS. 1 and 2 , the storage case 16 may include a rectangular plate-shaped lid 44 that opens and closes the opening 28a of the case body 28. Examples of materials for the lid 44 include transparent resins such as polycarbonate, polyethylene terephthalate, and polyvinyl chloride. Transparent resins are examples of transparent materials. The lid 44 may be movable in the longitudinal direction while being guided by the upper ends of the pair of second side walls 36. Movement of the lid 44 toward a first side in the longitudinal direction may be restricted by the upper ends of the first side walls 34a located on the first side in the longitudinal direction. Separation of the lid 44 from the case body 28 may be restricted by a plurality of first protruding pieces 34f and a plurality of second protruding pieces 36f. The lid 44 may be removable from the second side in the longitudinal direction relative to the case body 28.

[0031] The height of the protrusion 42 may be lower than the height of the peripheral wall 32. In this case, the position of the cutting insert 12 in the storage portion 28s is stabilized by the protrusion 42, while the protrusion 42 is less likely to get in the way when the cutting insert 12 is removed from the storage case 16. Furthermore, in a case where the storage case 16 is provided with a lid 44, the protrusion 42 is less likely to get in the way when the lid 44 is attached.

[0032] As in the examples shown in Figures 5, 7, and 8, in the insert set 10, the intermediate portion of the through hole 14 of the cutting insert 12 may have a regular octagonal prism shape. The intermediate portion of the through hole 14 is the intermediate portion in the depth direction. Instead of making the intermediate portion of the through hole 14 of the cutting insert 12 have a regular octagonal prism shape, a portion above or below the intermediate portion of the through hole 14 of the cutting insert 12 may have a regular octagonal prism shape. Instead of making the intermediate portion of the through hole 14 of the cutting insert 12 have a regular octagonal prism shape, the entire through hole 14 of the cutting insert 12 may have a regular octagonal prism shape. In other words, at least a portion of the through hole 14 of the cutting insert 12 may have a regular octagonal prism shape.

[0033] Instead of forming at least a portion of the through hole 14 of the cutting insert 12 in the shape of a regular octagonal prism, it may be formed in the shape of a regular polygonal prism other than a regular octagonal prism, such as a regular square prism or a regular pentagonal prism. Instead of forming at least a portion of the through hole 14 of the cutting insert 12 in the shape of a regular polygonal prism, it may be formed in the shape of a polygonal prism other than a regular polygonal prism. Note that the polygonal prism or regular polygonal prism shape of the through hole 14 described above is not limited to a strict meaning, as in the case of the protrusion 42.

[0034] 3 and other figures, the through hole 14 may further have a conical portion located closer to the upper surface 18 than the polygonal columnar portion. This conical portion may open at the upper surface 18. When such a conical portion is provided, the cutting insert 12 can be stably fastened by a fixing screw inserted into the through hole 14 when the cutting insert 12 is attached to the pocket of the holder.

[0035] In the insert set 10, the protrusion 42 of the case body 28 may be inserted into the through hole 14 of the cutting insert 12. Then, contact between the outer peripheral surface of the protrusion 42 of the case body 28 and the inner peripheral surface of the through hole 14 of the cutting insert 12 may restrict rotation of the cutting insert 12 around the central axis 14c of the through hole 14.

[0036] As shown in the examples of FIGS. 7 and 8 , in a predetermined cross section of the insert set 10, the inner peripheral surface of the through hole 14 of the cutting insert 12 may have an M1 polygonal shape. In a predetermined cross section of the insert set 10, the outer peripheral surface of the protrusion 42 of the case body 28 may have an M2 polygonal shape. The predetermined cross section is a cross section that is perpendicular to the central axis 14c of the through hole 14 of the cutting insert 12 and passes through the middle portion, which is the polygonal column-shaped portion of the through hole 14 of the cutting insert 12. Furthermore, between M1 and M2, M1 = n1 × M2...relationship 1 or M2 = n1 × M1...relationship 2 may be satisfied. However, M1 and M2 are integers greater than or equal to 3, and n1 is a natural number. In relations 1 and 2, n1 may be 1.

[0037] In a given cross section of the insert set 10, the inner peripheral surface of the through hole 14 of the cutting insert 12 and the outer peripheral surface of the protrusion 42 of the case body 28 may each have a regular octagonal prism shape. Instead of making the inner peripheral surface of the through hole 14 of the cutting insert 12 and the outer peripheral surface of the protrusion 42 of the case body 28 into a regular octagonal prism shape, they may also have a regular polygonal prism shape other than a regular octagonal prism shape, such as a regular square prism shape or a regular pentagonal prism shape.

[0038] In the insert set 10, the upper surface 18 of the cutting insert 12 may have an M3 polygonal shape. Between M1 and M3, M1 = n2 × M3 ... relationship 3 or M3 = n2 × M1 ... relationship 4 may be satisfied. However, M1 and M2 are integers equal to or greater than 3, and n2 is a natural number. In relationships 3 and 4, n2 may be 1.

[0039] 5 and 6 , in the storage case 16 of the example disclosed herein, the protrusion 42 of the case body 28 has a polygonal prism shape. Therefore, by forming at least a portion of the through hole 14 of the cutting insert 12 in a polygonal prism shape, contact between the outer peripheral surface of the protrusion 42 and the inner peripheral surface of the through hole 14 of the cutting insert 12 restricts rotation of the cutting insert 12 around the central axis 14c of the through hole 14. This reduces rattling of the multiple cutting inserts 12 stored in the storage case 16 and allows the multiple cutting inserts 12 to be fixed to the storage case 16 or to approach a fixed state with respect to the storage case 16. As a result, the storage case 16 of the example disclosed herein allows the positions and orientations of the multiple cutting inserts 12 to be aligned, and when automating the cutting insert 12 replacement process, the process of removing the cutting inserts 12 using a robot arm can be efficiently performed.

[0040] When each protrusion 42 has a regular polygonal prism shape, by making at least a portion of the through hole 14 of each cutting insert 12 into a regular polygonal prism shape, rotation of each cutting insert 12 around the central axis 14c of the through hole 14 is more restricted. This allows the multiple cutting inserts 12 to be fixed to the storage case 16 or to be brought closer to a fixed state to the storage case 16. As a result, the above-mentioned effects can be further enhanced.

[0041] In the insert set 10 according to the example of the present disclosure, as described above, at least a portion of the through hole 14 of the cutting insert 12 is polygonal prism-shaped. Contact between the outer peripheral surface of the protrusion 42 of the case body 28 and the inner peripheral surface of the through hole 14 of the cutting insert 12 restricts rotation of the cutting insert 12 around the central axis 14c of the through hole 14. This reduces wobble of the multiple cutting inserts 12 stored in the storage case 16, allowing the multiple cutting inserts 12 to be fixed to the storage case 16 or to approach a state where they are fixed to the storage case 16. As a result, the insert set 10 according to the example of the present disclosure allows the multiple cutting inserts 12 to be aligned in position and orientation. Therefore, when automating the cutting insert 12 replacement process, the process of removing the cutting inserts 12 using a robot arm can be efficiently performed.

[0042] 7 and 8, when Relationship 1 and Relationship 2 are satisfied between M1 and M2, the rotation of each cutting insert 12 around the central axis 14c of the through hole 14 is more restricted. This allows the cutting inserts 12 to be fixed to the storage case 16 or to be brought closer to a fixed state to the storage case 16. As a result, the above-mentioned effects can be further enhanced. In particular, when n1 is 1 in Relationship 1 and Relationship 2, the above-mentioned effects can be further enhanced.

[0043] Here, the sizes of the polygonal prism-shaped protrusion 42 and the polygonal prism-shaped through hole 14 do not have to be completely the same. That is, there may be a gap between the inner peripheral surface of the through hole 14 and the protrusion 42 that is large enough to restrict rotation of the cutting insert 12 around the central axis 14c of the through hole 14. In this case, the process of removing the cutting insert 12 by a robot arm becomes easier.

[0044] As described above, the polygonal protrusions 42 and the sides of the through-holes 14 may have slight irregularities. Therefore, for example, the outer surface of the protrusions 42 may have slight protrusions that protrude toward the through-holes 14. Conversely, the inner circumferential surface of the through-holes 14 may have slight protrusions that protrude toward the protrusions 42.

[0045] In these cases, the contact area between the inner peripheral surface of the through hole 14 and the protrusion 42 is reduced. Therefore, the process of removing the cutting insert 12 by the robot arm is facilitated while restricting the rotation of the cutting insert 12 around the central axis 14c of the through hole 14.

[0046] In a given cross section of the insert set 10, when the inner peripheral surface of the through hole 14 of the cutting insert 12 and the outer peripheral surface of the protrusion 42 of the case body 28 each have a regular polygonal prism shape, the rotation of each cutting insert 12 around the central axis 14c of the through hole 14 is more restricted. This allows the multiple cutting inserts 12 to be fixed to the storage case 16 or to be brought closer to a fixed state to the storage case 16. As a result, the above-mentioned effects can be further enhanced.

[0047] When Relationship 3 and Relationship 4 are satisfied between M1 and M3, the rotation of each cutting insert 12 around the central axis 14c of the through hole 14 is more restricted. This allows the cutting inserts 12 to be fixed to the storage case 16 or brought closer to a fixed state to the storage case 16. As a result, the above-mentioned effects can be further enhanced. In particular, when n2 is 1 in Relationships 3 and 4, the above-mentioned effects can be further enhanced.

[0048] 7 , the height of the protrusion 42 may be smaller than the thickness of the cutting insert 12. In this case, the position of the cutting insert 12 in the storage portion 28s is stabilized by the protrusion 42, while the protrusion 42 is less likely to get in the way when the cutting insert 12 is removed from the storage case 16.

[0049] 7 , the maximum value δ1 of the distance (gap) between the outer peripheral surface of the protrusion 42 and the inner peripheral surface of the through hole 14 may be smaller than the minimum value δ2 of the distance between the cutting insert 12 and the peripheral wall 32. That is, δ1 < δ2 may be satisfied. In such a case, when the cutting insert 12 is stored in the storage case 16, the cutting insert 12 is less likely to come into contact with the peripheral wall 32, the first partition wall 38, and the second partition wall 40, and the storage case 16 is less likely to be damaged.

[0050] In one embodiment, (1) a storage case for storing a cutting insert includes a bottom wall, a frame-shaped peripheral wall rising from an outer periphery of the bottom wall, a storage section located inside the peripheral wall for storing the cutting insert, and a protrusion located in the storage section and protruding from the bottom wall. The protrusion has a polygonal column shape.

[0051] (2) In the storage case of (1) above, the protrusion may have a regular polygonal prism shape.

[0052] (3) In the storage case of (1) or (2), the height of the protrusion may be lower than the height of the peripheral wall.

[0053] (4) In the storage case according to any one of (1) to (3), the protrusion may be located at the center of the storage section when viewed from above.

[0054] (5) An insert set includes a cutting insert having a through hole and a storage case for storing the cutting insert, as described in any one of claims 1 to 4. At least a portion of the through hole has a polygonal column shape, the protrusion is inserted into the through hole, and rotation of the cutting insert around the central axis of the through hole is restricted by contact between an outer peripheral surface of the protrusion and an inner peripheral surface of the through hole.

[0055] (6) In the insert set of (5) above, in a cross section perpendicular to the central axis of the through hole and passing through the polygonal columnar portion of the through hole, the inner peripheral surface of the through hole may have an M1 polygonal shape, and the outer peripheral surface of the protrusion may have an M2 polygonal shape, where M1 = n1 × M2 or M2 = n1 × M1, where M1 and M2 are integers equal to or greater than 3, and n1 is a natural number.

[0056] (7) In the insert set of (6), n1 may be 1.

[0057] (8) In any of the insert sets (5) to (7), in a cross section perpendicular to the central axis of the through hole and passing through the polygonal column-shaped portion of the through hole, the inner surface of the through hole and the outer surface of the protrusion may each be a regular polygon.

[0058] (9) In any of the insert sets (5) to (8), in a cross section perpendicular to the central axis of the through hole and passing through a polygonal columnar portion of the through hole, the inner peripheral surface of the through hole has an M1 polygonal shape, and the cutting insert further has an upper surface where the through hole opens and a cutting edge located on the outer peripheral edge of the upper surface, and the upper surface may have an M3 polygonal shape, where M1 = n2 × M3 or M3 = n2 × M1, where M1 and M2 are integers equal to or greater than 3, and n2 is a natural number.

[0059] (10) In the insert set of (9), n2 may be 1.

[0060] (11) In any of the insert sets (5) to (10), the cutting insert may further have an upper surface into which the through hole opens, and the through hole may further have a conical portion located closer to the upper surface than the polygonal column-shaped portion.

[0061] (12) In the insert set according to any one of (5) to (11), the height of the protrusion may be smaller than the thickness of the cutting insert.

[0062] (13) In any of the insert sets (5) to (12), the maximum value of the gap between the outer peripheral surface of the protrusion and the inner peripheral surface of the through hole may be smaller than the minimum value of the distance between the cutting insert and the peripheral wall.

[0063] The invention according to the present disclosure has been described above based on the drawings and embodiments. However, the invention according to the present disclosure is not limited to the above-described embodiments. In other words, the invention according to the present disclosure can be modified in various ways within the scope of the present disclosure, and embodiments obtained by appropriately combining the disclosed technical means are also included in the technical scope of the invention according to the present disclosure. In other words, it should be noted that a person skilled in the art can easily make various modifications or corrections based on the present disclosure. It should also be noted that these modifications or corrections are included in the scope of the present disclosure.

[0064] 10 Insert set 12 Cutting insert 14 Through hole 14c Central axis 16 Storage case 18 Upper surface 20 Lower surface 22 Side surface 24 Upper cutting edge (cutting edge) 26 Lower cutting edge (cutting edge) 28 Case body 28a Opening 28s Storage section 30 Bottom wall 32 Peripheral wall 34 First side wall 34a First side wall located on the first side in the length direction 34b First side wall located on the second side in the length direction 34f First protruding piece 36 Second side wall 36f Second protruding piece 38 First partition wall 40 Second partition wall 42 Protrusion 44 Lid body

Claims

1. A storage case for storing cutting inserts, The bottom wall and a frame-shaped peripheral wall rising from the outer peripheral edge of the bottom wall; a storage portion located inside the peripheral wall for storing the cutting insert; a protrusion located in the storage section and protruding from the bottom wall, The storage case, wherein the protrusion has a polygonal prism shape.

2. The storage case according to claim 1 , wherein the protrusion has a regular polygonal prism shape.

3. The storage case according to claim 1 , wherein the height of the protrusion is lower than the height of the peripheral wall.

4. The storage case according to claim 1 , wherein the protrusion is located at the center of the storage section when viewed from above.

5. a cutting insert having a through hole; and the storage case according to claim 1 that stores the cutting insert. At least a portion of the through hole has a polygonal column shape, The protrusion is inserted into the through hole, and rotation of the cutting insert around the central axis of the through hole is restricted by contact between the outer surface of the protrusion and the inner surface of the through hole.

6. In a cross section perpendicular to a central axis of the through hole and passing through a polygonal column-shaped portion of the through hole, an inner peripheral surface of the through hole has an M1 polygonal shape, and an outer peripheral surface of the protrusion has an M2 polygonal shape, The insert set according to claim 5, wherein M1 = n1 x M2 or M2 = n1 x M1, M1 and M2 are integers of 3 or greater, and n1 is a natural number.

7. The insert set of claim 6, wherein n1 is 1.

8. The insert set according to claim 5, wherein in a cross section perpendicular to the central axis of the through hole and passing through the polygonal column-shaped portion of the through hole, the inner surface of the through hole and the outer surface of the protrusion are each a regular polygon.

9. In a cross section perpendicular to the central axis of the through hole and passing through a portion of the polygonal column shape of the through hole, an inner peripheral surface of the through hole has an M1 polygonal shape, The cutting insert comprises: an upper surface where the through hole opens; a cutting edge located on the outer periphery of the upper surface, The upper surface has an M3 polygonal shape, The insert set according to claim 7, wherein M1 = n2 x M3 or M3 = n2 x M1, M1 and M2 are integers greater than or equal to 3, and n2 is a natural number.

10. The insert set of claim 9, wherein n2 is 1.

11. The cutting insert further has an upper surface on which the through hole opens, The insert set according to claim 5 , wherein the through-hole further has a conical portion located closer to the upper surface than the polygonal column-shaped portion.

12. The insert set according to claim 5 , wherein the height of the protrusion is less than the thickness of the cutting insert.

13. The insert set according to claim 5 , wherein a maximum value of a gap between an outer peripheral surface of the protrusion and an inner peripheral surface of the through hole is smaller than a minimum value of a gap between the cutting insert and the peripheral wall.