JP2023005804A - Cutting tool, cutting insert and tool body - Google Patents

Abstract

To provide a cutting tool in which a cutting insert can be stably attached to a tool body and positional deviation of the cutting insert during cutting can be prevented, and also provide the cutting insert and the tool body.SOLUTION: A cutting tool in the present invention is a tool in which a cutting insert is attached to a tool body. The cutting insert has a rake face and a seating face, and the rake face and the seating face are connected by a side face including a flank. The tool body has one or more pockets at one end thereof, and includes a fitting seat and one or more fitting side faces angled with respect to the fitting seat in the pocket. The seating face, the side face, the fitting seat, and the fitting side face respectively have a restraining part. Processing streaks at a constant cycle are formed with 0.05 μm≤Ra≤6.30 μm on all restraining parts. In the state where the cutting insert is attached to the tool body, an angle θ between a processing streak of the cutting insert in each restraining part and a processing streak of the tool body is 0°≤θ≤5°.SELECTED DRAWING: Figure 1

Description

Patent Act Article 30, Paragraph 2 application filed (1) Date of issue (publication date) July 1, 2020 Publication 2020 Journal of Abrasive Technology Society, Vol. 64, No. 7, pp. 380-387 Published by The Society of Abrasive Technology <Source> 2020 Journal of the Society of Abrasive Technology Vol. Faculty of Engineering, Bldg. 17, Room 216 Publisher: Fumihiko Inagaki (3) Website posting date: September 30, 2020 Website address: https://opac. ll. chiba-u. jp/da/curator/109357/ Publisher Chiba University

The present invention relates to cutting tools, cutting inserts and tool bodies.

For cutting inserts that use replaceable cutting inserts attached to the tool body, insert the mounting hole of the cutting insert into The cutting insert is attached to the tool body by screwing the inserted clamp screw into a threaded hole formed in the tool body.

In this case, if the seating surface of the cutting insert and the mounting surface of the tool body are flat surfaces, the cutting insert tends to shift relative to the tool body due to the cutting load during cutting.
Therefore, a plurality of convex streaks with a size of several mm are provided on one of the seating surface of the cutting insert and the mounting surface of the tool body, and a plurality of recessed streaks with a size of several mm are provided on the other side. , are engaged with each other to restrain the displacement of the cutting insert.

Fumihiko Inagaki, Noboru Morita, Hiroshi Hidai, Sota Matsuzaka, Shinji Shimizu, Akira Chiba, Yuichiro Matsumoto, "Influence of bonding surface properties on insert gripping characteristics of indexable cutting tools", Journal of Abrasive Technology, 2020, pp . 380-387

When the cutting insert is attached to the tool body, not only the seating surface but also part of the side surface is restrained by the tool body. Therefore, if an uneven shape is provided on the side surface of the cutting insert to suppress the displacement, the shape of the cutting edge may be affected because the dimensions of the unevenness are in units of several millimeters. That is, since there is a risk that the uneven shape of the side surface may be reflected in the shape of the cutting edge, it has been difficult to provide the uneven shape to the side surface other than the seating surface.

Further, in the case where the seating surface and the side surface of the cutting insert are each formed with an uneven shape, when the cutting insert is attached to the tool body, each unevenness can be fitted into the unevenness on the tool body side. difficult. Therefore, the uneven shape can be applied only to the seating surface of the cutting insert, which has the largest contact area with the tool body and does not affect the cutting edge.

The present invention has been made under such a background, and provides a cutting tool, a cutting insert, and a tool capable of stably attaching a cutting insert to a tool body and preventing displacement of the cutting insert during cutting. The purpose is to provide the body

A cutting tool according to one aspect of the present invention is a cutting tool in which a cutting insert is attached to a tool body that rotates around a rotation axis, the cutting insert having a rake face and a seating surface. The tool body is connected to the seating surface by a side surface including a flank, and the tool body has one or more pockets at one end, and the pocket includes a mounting seat and an angle with respect to the mounting seat. each of the seating surface, the side surface, the mounting seat, and the mounting side surface has a restraining portion, and all of the restraining portions have zero machined streaks at a constant period. .05 μm≦Ra≦6.30 μm, and in a state in which the cutting insert is attached to the tool body, the angle θ formed between the machining creases of the insert and the machining creases of the tool body at each restraint portion is 0°≦θ≦5°.

A cutting insert according to one aspect of the present invention has a pair of rake and seating surfaces, and a side surface including a flank connects the rake and seating surfaces. A constraining portion is provided, and the constraining portion is characterized in that the processing streaks of a constant period are formed with 0.05 μm≦Ra≦6.30 μm.

A tool body of one aspect of the present invention is a tool body that rotates around a rotation axis, the tool body has one or more pockets at one end, and the pockets include a mounting seat and the mounting seat. and one or more mounting side surfaces having an angle with respect to the mounting seat and the mounting side surface, each of the mounting seat and the mounting side surface having a restraining portion, and the restraining portion having a constant period of machining streaks of 0.05 μm≦Ra≦6 .30 μm.

According to this configuration, the cutting insert and the tool body each have two or more constraining portions, intentionally form machining creases in each constraining portion, and furthermore, the machining creases are formed at a constant cycle and arithmetically. By forming the average height Ra to be within a certain range, the width and height difference between the machining score formed in the constraining portion of the cutting insert and the machining score provided in the constraining portion of the tool body can be made closer. In addition, when the cutting insert is attached to the tool body, between the cutting insert and the tool body, the angle formed by the machining lines in the restraint portion is 0 ° ≤ θ ≤ 5 °, so that each machining line The directions are approximately the same. Therefore, the machined lines mesh well with each other, and the mutual contact area increases. As a result, the restraining force at each restraining portion is increased, and it is possible to suppress the displacement of the cutting insert with respect to the tool body. Further, by forming machining lines having a microscopic orientation in each restraining portion, positioning of the cutting insert relative to the tool body is facilitated, and macroscopic mounting becomes possible.

At this time, the arithmetic mean height Ra was set to 0.05 μm≦Ra≦6.30 μm, but it is desirable to satisfy 0.10 μm≦Ra≦2.00 μm. Also, the angle formed by the machined lines in the constraining portion was set to 0°≦θ≦5°, but it is preferable to set the angle to 0°≦θ≦2°.

Also, the period of the processed streaks may be 0.05 mm to 0.50 mm, preferably 0.05 mm to 0.20 mm.

In addition, according to the present invention, machining creases are formed in a plurality of restraining portions facing different directions on the cutting insert and the tool body, respectively, and the machining creases can be meshed in all restraining portions. In the above configuration, the range of the arithmetic mean height Ra is defined as a parameter of the surface roughness, but it is not desirable from the viewpoint of meshing that there are places where the height of the processed streaks is extremely high or extremely low. Therefore, in the present invention, the maximum height Rz of the machining lines formed on the cutting insert and the tool body may be 0.10 μm≦Rz≦25.00 μm, preferably 0.50 μm≦Rz≦12.00 μm.

The machining lines in the corresponding cutting tool, cutting insert, and tool body of the present invention may be formed by grinding.

In the present invention, processing lines are formed by grinding. Although it is conceivable to form machining lines when manufacturing cutting inserts and tool bodies, it is difficult to obtain machining lines of a certain period due to undulations caused by sintering. On the other hand, by forming processing lines by grinding, it is possible to obtain a fine irregular shape with a constant period.

Advantageous Effects of Invention According to the present invention, it is possible to provide a cutting tool, a cutting insert, and a tool body that can stably attach the cutting insert to the tool body and prevent the cutting insert from shifting during cutting.

FIG. 1 is a perspective view showing one embodiment of a cutting tool. FIG. 2 is a view showing one embodiment of the tool body, and is a perspective view of a partially enlarged insert pocket. FIG. 3 is a perspective view showing one embodiment of the cutting insert. FIG. 4 is a diagram schematically showing each restraining portion of the cutting insert in one embodiment. FIG. 5 is a diagram schematically showing each restraining portion of the tool body in one embodiment. FIG. 6(a) is an enlarged view showing machining creases of each restraining portion in the cutting insert, and FIG. 6(b) is an enlarged view showing machining creases of each restraining portion in the cutting insert. FIG. 7 is a diagram schematically showing a part of the verification machine, FIG. 7(a) shows the state of measurement when a radial component force is applied to the cutting insert, , shows the state of measurement when an axial load is applied to the cutting insert. FIGS. 8A to 8D are diagrams schematically showing the direction of the machined creases (the crease angles θ4 to θ6: 90°) in the tool body and each restraining portion used for the evaluation. FIGS. 9A to 9D are diagrams schematically showing the cutting insert 10A used in the evaluation and the direction of the machined crease (the crease angle θ1 to θ3: 90°) in each restraining portion. FIG. 10(a) is a view partially showing a cutting tool with a cutting insert attached to a tool body, and is a view for explaining the verification results; (a) to (c), which are cross-sectional views taken along line -A', schematically show the state of engagement between each restraint portion of the cutting insert and each restraint portion of the tool body for each surface roughness. It is a diagram. FIG. 11 is a diagram showing directions in which a load is applied. FIGS. 12(a) to (c) show the load (horizontal axis of the graph, unit N) of the cutting insert at each of (a) the long side constraining portion, (b) the bottom constraining portion, and (c) the short side constraining portion. It is a graph which shows the relationship of the amount of rotational displacement (amount of displacement, a graph vertical axis, and a unit of micrometers). FIGS. 13(a) to (c) show (a) the long-side constraining portion, (b) the bottom-side constraining portion, and (c) the short-side constraining portion, respectively. 4 is a graph showing the relationship between the amount of rotational displacement of the insert (vertical axis of the graph, unit: μm). 14(a) to (c) show the radial component force (horizontal axis of the graph, unit N) in each of (a) the long side constraining portion, (b) the bottom constraining portion, and (c) the short side constraining portion. 4 is a graph showing the relationship between the amount of rotational displacement of the cutting insert (vertical axis of the graph, unit: μm). FIGS. 15(a) to (c) show (a) the long-side constraining portion, (b) the bottom-side constraining portion, and (c) the short-side constraining portion, respectively. 4 is a graph showing the relationship between the amount of rotational displacement of the insert (vertical axis of the graph, unit: μm). 16A and 16B are diagrams showing the relationship between the shearing direction acting on the short-side constraining portion and the machining score. is 135°.

Embodiments to which the present invention is applied will be described in detail below with reference to the drawings. In the drawings used in the following description, in some cases, non-characteristic parts are omitted for convenience in order to make the characteristic parts easier to understand.

<Cutting tool>
FIG. 1 is a perspective view showing one embodiment of a cutting tool 100. FIG.
A cutting tool 100 of this embodiment has a plurality of cutting inserts 10 and a tool body 30, as shown in FIG. The cutting tool 100 performs milling by rotating the tool body 30 about the rotation axis JO in the rotation direction TD.

(tool body)
FIG. 2 is a view showing one embodiment of the tool body 30, and is a perspective view showing a partially enlarged insert pocket 31. FIG.
As shown in FIG. 2, the tool body 30 is formed in a columnar shape from a metal material such as steel. The tool body 30 has a plurality (for example, three) of insert pockets (pockets) 31 at the tip. An insert mounting seat 33 is formed in the insert pocket 31 . The insert mounting seat 33 is a base on which the cutting insert 10 is mounted. The insert mounting seat 33 has a mounting seat 33a, a long-side mounting side surface (mounting side surface) 33b, and a short-side mounting side surface (mounting side surface) 33c.

The mounting seat 33a is a surface facing the rotational direction TD. The mounting seat 33a is a surface facing a seating surface 13 of the cutting insert 10, which will be described later, and has an area substantially equal to that of the seating surface 13. As shown in FIG. A screw hole 32 is formed substantially in the center of the mounting seat 33a. The mounting seat 33a contacts the seating surface 13 of the mounted cutting insert 10 .

The long-side mounting side surface (mounting side surface) 33b extends in the rotational direction TD from the long side of the mounting seat 33a along the rotation axis JO. The long-side attachment side surface 33b is a surface facing the long-side side surface of the cutting insert 10, which will be described later, and has an area substantially equal to the long-side side surface. The long-side attachment side surface 33b contacts the flanks of the long-side side surfaces of the attached cutting insert 10 .

A short-side mounting side surface (mounting side surface) 33c extends in the rotational direction TD from the short side of the mounting seat 33a perpendicular to the rotation axis JO. The short-side attachment side surface 33c is a surface facing the short-side side surface of the cutting insert 10 described later, and has an area substantially equal to the short-side side surface. The short-side attachment side surface 33c contacts the flanks of the short-side side surfaces of the attached cutting insert 10 .

As shown in FIG. 1, the cutting inserts 10 are attached to the respective insert mounting seats 33 of the tool body 30 shown in FIG. As shown in FIG. 1, the cutting insert 10 is configured such that a clamp screw 38 inserted into the mounting hole 7 of the cutting insert 10 is tightened into the threaded hole 32 formed in the center of the mounting seat 33a of the tool body 30 shown in FIG. is attached to the insert mounting seat 33 by means of

(cutting insert)
FIG. 3 is a perspective view showing one embodiment of the cutting insert 10. FIG.
As shown in FIG. 3, the cutting insert 10 is made of a hard material such as cemented carbide. The cutting insert 10 has a polygonal plate shape (rectangular plate shape in this embodiment) that is 180° rotationally symmetrical with respect to the center line CO extending in the thickness direction. In the following description, the direction along the center line CO may be simply referred to as the thickness direction. Also, the direction perpendicular to the center line CO may be simply called the width direction. Similarly, the circumferential direction around the centerline CO may be simply referred to as the circumferential direction.

The cutting insert 10 has a rake face 12 forming one of a pair of polygonal faces, a seating face 13 forming the other of the pair of polygonal faces, and a side face 14 connecting between the rake face 12 and the seating face 13. , is equipped with The cutting insert 10 of the present embodiment has a rectangular shape or a parallelogram shape when viewed from the direction along the center line CO. The seating surface 13 has a size smaller than that of the rake face 12 in plan view, and is included inside the projection area of the rake face 12 in the centerline direction.

A cutting edge portion 20 is provided on the intersection ridgeline between the rake face 12 and the side face 14 .
Since the cutting insert 10 of this embodiment is a positive type cutting insert, the flank forming the side surface 14 is an inclined surface substantially along the flank angle.

The cutting insert 10 shown in FIG. 3 is detachably attached to the tool body 30 rotating around the rotation axis JO shown in FIG. 2 by means of the clamp screw 38 shown in FIG. The cutting insert 10 has its seating surface 13 in close contact with (contacts with) the mounting seat 33a of the tool body 30, and the two circumferentially adjacent long-side side surfaces 14b and short-side side surfaces 14c are connected to the long-side mounting side surfaces. It is seated in close contact with (contacts with) each of the short-side mounting side surface 33b and the short-side mounting side surface 33c.
That is, the seating surface 13 of the cutting insert 10 is restrained by the mounting seat 33a of the insert mounting seat 33 in the tool body 30, and the long side surface 14b and the short side surface 14c of the cutting insert 10 are in contact with the long side of the tool body 30. It is restrained by the mounting side surface 33b and the short side mounting side surface 33c.

Next, detailed configurations of the cutting insert 10 and the tool body 30 will be described.

As shown in FIGS. 4(a) to (c) and FIGS. 5(a) to (c), the cutting insert 10 and the tool body 30 of the present embodiment are constrained by constraining portions 15a to 15c, 35a to 35c, respectively.
FIGS. 4(a) to 4(c) are diagrams schematically showing restraining portions 15a to 15c of the cutting insert 10 in one embodiment. FIG. 4( a ) shows the restraining portion 15 a formed on the seating surface 13 of the cutting insert 10 . FIG. 4(b) is a view seen from the −X direction in FIG. 3, and shows the long-side constraining portion 15b formed on the long-side side surface 14b. FIG. 4(c) is a view seen from the −Z direction in FIG. 3, and shows the short-side constraining portion 15c formed on the short-side side surface 14c.

FIGS. 5(a) to 5(c) are diagrams schematically showing respective restraining portions 35a to 35c of the tool body 30 in one embodiment. FIG. 5(a) shows a restraining portion 35a formed on the mounting seat 33a of the tool body 30. FIG. FIG. 5(b) is a diagram viewed from the radially outer side (X direction) of FIG. 2 and shows the long side restraining portion 35b formed on the long side mounting side surface 33b. FIG. 5(c) is a view seen from the tip end side (Z direction) of FIG. 2 and shows the short side restraining portion 35c formed on the short side mounting side surface 33c.

FIG. 6(a) is an enlarged view showing a part of the restraining portions 15a to 15c (machining creases 16a to 16c) of the cutting insert 10, and FIG. 35c (processing lines 36a to 36c) is partially enlarged. FIG.

(Restraining part of cutting insert)
As shown in FIG. 4( a ), the cutting insert 10 of this embodiment has a bottom constraining portion 15 a on the seating surface 13 . In this embodiment, the entire seating surface 13 is formed with a bottom restraining portion 15a. The bottom constraining portion 15a is a portion that is constrained by a bottom constraining portion 35a (FIG. 5(a)) formed in the mounting seat 33a of the insert mounting seat 33 of the tool body 30 shown in FIG.

As shown in FIG. 4(b), the cutting insert 10 has long-side constraining portions 15b on the long-side side surfaces 14b. In this embodiment, the long-side constraining portion 15b is formed on the entire long-side side surface 14b. The long-side constraining portion 15b of the cutting insert 10 is formed on the long-side mounting side surface 33b of the insert mounting seat 33 of the tool body 30 shown in FIG. It is a part that is constrained by

Furthermore, as shown in FIG. 4(c), the cutting insert 10 has a short-side constraining portion 15c on the short-side side surface 14c. In this embodiment, the short-side constraining portion 15c is formed on the entire short-side side surface 14c. The short side constraining portion 15c of the cutting insert 10 is formed on the short side mounting side surface 33c of the insert mounting seat 33 of the tool body 30 shown in FIG. It is a restricted part.

Machining grooves 16a to 16c, which form fine irregularities (several μm) with a constant period, are formed on the restraining portions 15a to 15c of the cutting insert 10, respectively (see FIG. 6A). In this embodiment, processing lines 16a to 16c extending in one direction are formed over the entire area of each of the restraining portions 15a to 15c. Each of the processing lines 16a to 16c is formed by grinding using a grindstone, for example.

As shown in FIG. 4( a ), when viewed from the axial direction of the cutting insert 10 , the machined grooves 16 a formed on the seating surface 13 of the cutting insert 10 are arranged along the longitudinal direction or along the longitudinal direction. It extends in a direction forming a predetermined angle (streak angle θ1). In this embodiment, for example, the score angle θ1 when the machining score 16a extends along the longitudinal direction of the cutting insert 10 is set to 0°. As other examples, the cases where the score angle θ1 of the machining score 16a with respect to the longitudinal direction of the cutting insert 10 is 45°, 90°, and 135° are exemplified.
Note that the score angle θ1 of the machining score 16a with respect to the longitudinal direction of the cutting insert 10 is not limited to the numerical value described above.

As shown in FIG. 4(b), in a side view seen from the -X direction in FIG. It extends in a direction forming a predetermined angle (streak angle θ2) with respect to line CO. In this embodiment, for example, the score angle θ2 when the machining score 16b extends along the center line CO of the cutting insert 10 is set to 0°. As other examples, cases where the score angle θ2 of the machining score 16b with respect to the center line CO of the cutting insert 10 is 45°, 90°, and 135° are exemplified.
In addition, the score angle θ2 of the machining score 16b with respect to the center line CO of the cutting insert 10 is not limited to the numerical value described above.

As shown in FIG. 4(c), in a side view seen from the −Z direction in FIG. direction), or a direction forming a predetermined angle (streak angle θ3) with respect to the center line CO. In this embodiment, for example, the score angle θ3 when the machining score 16c extends along the center line CO of the cutting insert 10 is set to 0°. As other examples, cases where the score angle θ3 of the machining score 16c with respect to the center line CO of the cutting insert 10 is 45°, 90°, and 135° are illustrated.

Here, it is preferable that the crease angles θ1 to θ3 of the machining creases 16a to 16c formed in the restraining portions 15a to 15c of the cutting insert 10 are equal to each other. For example, when the score angle θ1 of the processed score 16a on the seating surface 13 side is 0°, the score angle θ2 of the processed score 16b on the long side and the score angle θ3 of the processed score 16c on the short side are also 0°. .

(Restraining part of tool body)
As shown in FIGS. 5A to 5B, machining streaks 36a to 36c are formed in the constraining portions 35a to 35c of the tool body 30, respectively. (See FIG. 6(b)). In this embodiment, processing lines 36a to 36c extending in one direction are formed over the entire restraining portions 35a to 35c. The processed lines 36a to 36c are formed, for example, by grinding using an end mill.

As shown in FIG. 5A, when viewed from the circumferential direction, the machining grooves 36a formed on the mounting seat 33a of the tool body 30 are aligned along the rotation axis JO of the tool body 30 (Z direction) or in the direction of rotation. It extends in a direction forming a predetermined crease angle θ4 with respect to the axis JO (Z direction). In this embodiment, for example, the score angle θ4 when the machining score 36a extends along the rotation axis JO (Z direction) of the tool body 30 is set to 0°. In addition, the score angle θ4 of the machining score 36a with respect to the rotation axis JO (Z direction) of the tool body 30 may be 45°, 90°, or 135°.

As shown in FIG. 5(b), in a side view seen from the radially outer side (X direction) in FIG. Z direction) or a direction forming a predetermined angle (streak angle θ5) with respect to a direction orthogonal to the rotation axis JO (Z direction). In this embodiment, for example, the score angle θ5 when the machining score 16b extends in the direction orthogonal to the rotation axis JO (Z direction) of the tool body 30 is set to 0°. In addition, the score angle θ5 of the machining score 16b with respect to the center line CO (Y direction) of the cutting insert 10 may be 45°, 90°, or 135°.

As shown in FIG. 5(c), in a side view from the tip end side (Z direction) in FIG. It extends in a direction along JO (Z direction) or in a direction forming a predetermined angle (streak angle θ6) with respect to the center line CO (Y direction). In this embodiment, for example, the score angle θ6 when the machining score 16c extends along the center line CO (Y direction) of the cutting insert 10 is set to 0°. In addition, the score angle θ6 of the machining score 16c with respect to the center line CO (Y direction) of the cutting insert 10 may be 45°, 90°, or 135°.

Here, the crease angles θ4 to θ6 of the machining creases 36a to 36c formed on the restraining portions 35a to 35c of the tool body 30 are equal to each other. For example, when the score angle θ4 of the machining score 36a on the mounting seat 33a side is 0°, the score angle θ5 of the machining score 36b on the long side and the score angle θ6 of the machining score 36c on the short side are also 0°. .

When the cutting insert 10 is attached to the tool body 30, the restraining portions 15a to 15c on the side of the cutting insert 10 and the restraining portions 15a to 35c on the side of the tool body 30 facing them have machining creases 16a to 35c formed respectively. The extending directions of 16c, 36a to 36c are the same. Specifically, between the restraining portions 15a to 15c and 35a to 35c facing each other in the cutting insert 10 and the tool body 30, the machining creases 16a to 16c of the cutting insert 10 and the machining creases 36a to 36c of the tool body 30 are arranged. The angle θ formed with 36c is within the range of 0°≦θ≦5°.

FIG. 6(a) is an enlarged view of machining creases 16a to 16c of the restraint portions 15a to 15c of the cutting insert 10, and FIG. 6(b) is a diagram of the restraint portions 35a to 35c of the tool body 30. FIG. 4 is an enlarged view of machining lines 36a to 36c;
In this embodiment, the processed lines 16a to 16c and the processed lines 36a to 36b are formed so that the maximum height Rz is 6.30 μm or less. Specifically, it is preferably within the range of 0.10 μm≦Rz≦6.30 μm. Due to such machining creases 16a to 16c and machining creases 36a to 36b, the restraining portions 15a to 15c of the cutting insert 10 and the restraining portions 35a to 35c of the tool body 30 are formed, for example, as shown in FIGS. As shown, it has microscopic unevenness, but macroscopically, it forms a flat surface.

As described above, the restraining portions 15a to 15c of the cutting insert 10 and the restraining portions 35a to 35c of the tool body 30 are all formed by grinding.
When a grindstone is used to form the machining lines 16a to 16c on the restraining portions 15a to 15c of the cutting insert 10, the grain size of the grindstone is changed to form the machining lines 16a to 16c in an uneven shape of a predetermined size. It is possible to form By grinding while moving the grindstone in one direction, it is possible to form the processing lines 16a to 16c with a constant period.

In addition, an end mill can be used when forming the processing lines 36a to 36c on the restraining portions 35a to 35c of the tool body 30. However, in such a grinding process, the cusp height ( It is possible to adopt a ball end mill with the largest theoretical machined surface roughness. For example, by using a ball end mill with a tool edge diameter of 1.5 mm to finish the restraining portions 35a to 35c, it is possible to form the machining lines 36a to 36c having minute unevenness. . By grinding while moving the end mill in one direction, it is possible to form machining lines 36a to 36b with a constant period.

As a method for forming the machining creases 36a to 36c on the restraining portions 35a to 35c of the tool body 30, it is conceivable to use a grindstone as in the case of the cutting insert 10, but depending on the size of the grindstone, the tool body 30 It is difficult to process each of the restraining portions 35a to 35c of the insert mounting seat 33 in . Therefore, it is preferable to use an end mill capable of processing minute areas.

As another method, it is conceivable to form the machining lines 16a to 16c and 36a to 36c when sintering the cutting insert 10 and the tool body 30, but the sintered surface tends to undulate. For this reason, it is considered that if the fine uneven machining lines 16a to 16c and 36a to 36c are formed in the constraining portion made of such a sintered surface, the unevenness of the unevenness will increase with the undulation of the sintered surface. be done. Therefore, it is preferable to use an end mill capable of flattening the sintered surface by grinding and applying fine processing lines 16a to 16c and 36a to 36c. By using an end mill, it is possible to uniformly finish the machining lines 36a to 36c of a constant period.

Although cutter marks may be formed on the machined surface during grinding with an end mill, machining is performed so that the cutter marks have periodicity, so that the machined lines 16a to 16c and 36a to 36c with a constant period are removed. It is also possible to form

As described above, in the present embodiment, the machining creases 16a to 16c of the cutting insert 10 are finished by the grindstone, and the machining creases 36a to 36c of the tool body 30 are finished by the end mill. Any other method may be used as long as it is possible to form the uneven processing lines 16a to 16c and 36a to 36c. For example, laser patterning or electrical discharge machining may be employed.

Further, it is preferable that the processed lines 16a to 16c and the processed lines 36a to 36b have the same maximum height Rz. Since the surface roughness of the processed lines 16a to 16c and the processed lines 36a to 36b, that is, the periodicity of the unevenness is close, the mutual contact area can be increased, and the fitting strength can be increased.

In this embodiment, the cutting insert 10 and the tool body 30 each have two or more restraining portions 15a to 15c and 35a to 35c, and the restraining portions 15a to 15c and 35a to 35c have machining creases 16a to 16c and 36a. ~36c is intentionally formed. Machining lines 16a to 16c of a constant cycle are formed on each of the constraining portions 15a to 15c of the cutting insert 10, respectively, with a condition of 0.05 μm≦Ra≦6.30 μm. By forming the machining creases 0.05 μm≦Ra≦6.30 μm respectively, the machining creases 16 a to 16 c formed in the restraint portions 15 a to 15 c of the cutting insert 10 and the restraint portions 35 a to 35 c of the tool body 30 have The width and height difference of the processed lines 36a to 36c can be made closer. In addition, when the cutting insert 10 is attached to the tool body 30, between the cutting insert 10 and the tool body 30, the machining creases 16a to 16c and 36a to 36c at the restraint portions 15a to 15c and 35a to 35c Since the angles are 0°≦θ≦5°, the directions of the facing machining lines 16a to 16c and 36a to 36c substantially match each other. Therefore, the machining lines 16a to 16c and 36a to 36c mesh well with each other, and the mutual contact area increases. As a result, the restraining forces of the restraining portions 15a to 15c and 35a to 35c are increased, and it is possible to prevent the cutting insert 10 from shifting with respect to the tool body 30. As shown in FIG. In addition, by forming the machining grooves 16a to 16c and 36a to 36c having microscopic orientations in the restraining portions 15a to 15c and 35a to 35c, the cutting insert 10 can be easily positioned with respect to the tool body 30. Macroscopic mounting is possible.

The arithmetic mean height Ra is set to 0.05 μm≦Ra≦6.30 μm, but is preferably 0.10 μm≦Ra≦2.00 μm. The angles formed by the processing lines 16a to 16c and 36a to 36c in the restraining portions 15a to 15c and 35a to 35c may be 0°≦θ≦5°, preferably 0°≦θ≦2°.

The period of the processing lines 16a-16c and 36a-36c may be 0.05mm-0.50mm, preferably 0.05mm-0.20mm.

In addition, in the present embodiment, the cutting insert 10 and the tool body 30 are each formed with machining creases 16a to 16c and 36a to 36c in a plurality of restraint portions 15a to 15c and 35a to 35c facing different directions, and all restraint portions Machining lines 16a to 16c and 36a to 36c can be meshed with 15a to 15c and 35a to 35c. In the above configuration, the range of the arithmetic mean height Ra is defined as a parameter of the surface roughness, but there are places where the heights of the machining lines 16a to 16c and 36a to 36c are extremely high or extremely low. is undesirable from the viewpoint of meshing. Therefore, in this embodiment, the maximum height Rz of the machining lines 16a to 16c and 36a to 36c formed on the cutting insert 10 and the tool body 30 may be 0.10 μm≦Rz≦25.00 μm, preferably 0 .50 μm≦Rz≦12.00 μm.

According to this embodiment, the cutting tool 100 is provided with the cutting insert 10 and the tool body 30 that can stably attach the cutting insert 10 to the tool body 30 and prevent the cutting insert 10 from being displaced during cutting. can provide.

Hereinafter, the present invention will be specifically described with reference to Examples 1 and 2. However, the present invention is not limited to these Examples 1 and 2.

In Examples 1 and 2, when cutting was performed using the cutting insert and the tool body described in the above embodiment, the surface roughness and knot direction at each restraint portion of the cutting insert and the tool body were It was verified to what extent each of them affects the shift movement (displacement amount) of the cutting insert.
Here, considering the case of machining the vertical wall in the axial direction and the seating surface machining in the radial direction, the verification was performed separately for each load direction (radial component force, axial load). .

7(a) and (b) are diagrams schematically showing a part of the verification machine, and FIG. 7(a) shows the state of measurement when a radial force component is applied to the cutting insert. , FIG. 7(b) shows the state of measurement when an axial load is applied to the cutting insert.
As shown in FIGS. 7(a) and 7(b), the external force simulating the cutting resistance to the cutting insert is applied to the evaluation cutting tool ( The load was applied by pressing against the cutting insert) from the radial direction or the axial direction. The displacement amount and behavior of the cutting insert were measured by a dial gauge 52 arranged on the outer periphery of the cutting insert, and the displacement amount of the insert alone was calculated by subtracting the displacement amount of the tool body alone, which was separately measured by the dial gauge 52.

[Verification of the influence of surface roughness]
First, the relationship between the arithmetic mean height Ra of the restraining portion of the cutting insert and the arithmetic mean height Ra of the restraining portion of the tool body is determined for each of the radial component force and the axial component force of the cutting insert with respect to the tool body. Verification was performed to see how much it affects the amount of rotational displacement.
As an example, a cutting insert and a tool body each having a grooved portion were prepared.
In addition, as a comparative example, a cutting insert was prepared in which the long-side constraining portion and the short-side constraining portion were sintered surfaces, and the bottom constraining portion was subjected to planetary grinding. The cutting insert of the comparative example does not have machining lines in any of the constraining portions.

FIGS. 8A to 8D are diagrams schematically showing the direction of the grooves (the groove angles θ4 to θ6: 90°) of the machined grooves 36a to 36c in the tool body 30A and the restraining portions 35a to 35c used in the evaluation. is. FIGS. 9A to 9D are diagrams schematically showing the cutting insert 10A used for evaluation and the direction of the cut lines 16a to 16c (the line angles θ1 to θ3: 90°) of the restraint portions 15a to 15c. is. FIG. 10(a) is a view partially showing a cutting tool in which cutting inserts 10A to 10D are attached to a tool body 30A, and is a view for explaining verification results. FIG. 10(b) is a cross-sectional view taken along line A-A' in FIG.

As a tool body sample, one tool body 30A having the conditions shown in Table 1 and FIGS. 8(a) to (d) was prepared.
"Tool body 30A"
・Arithmetic mean height Ra of restraint portions 35a to 35c: 1.10 μm
・Processing streak period: 0.13 mm
・The angle of the processed creases 36a to 36c: unified at 90°

As cutting insert samples of Example 1, three cutting inserts 10A to 10C under the conditions shown in Table 1 and FIGS. 9(a) to (d) were prepared.
"Cutting insert 10A"
・Arithmetic mean height Ra: 0.16 μm
・Processing streak period: 0.05 mm
・Unified at 90° at the cut angle θ1 of the machined cuts 36a to 36c “Cutting insert 10B”
・Arithmetic mean height Ra: 1.00 μm
・Processing streak period: 0.12 mm
・The crease angle θ2 of the restraining parts 15a to 15c: Unified at 90° "Cutting insert 10C"
・Arithmetic mean height Ra: 3.10 μm
・Processing streak period: 0.21 mm
・Streak angle θ3 of processing creases 36a to 36c: unified at 90°

When the cutting inserts 10A to 10C are attached to the tool body 30A, the restraining portions 15a to 15c on the cutting inserts 10A to 10D are restrained by the restraining portions 35a to 35c on the tool body 30A.

FIGS. 10A to 10C schematically show how the restraining portions 15a to 15c of the cutting inserts 10A to 10D are fitted to the restraining portions 35a to 35c of the tool body 30A for each surface roughness. It is a diagram.
As shown in FIG. 10(b), when the surface roughness of the restraint portions 15a to 15c of the cutting inserts 10A to 10C is closest to the surface roughness of the restraint portions 35a to 35c of the tool body 30A, The contact areas of the processing lines 16a-16c and 36a-36c are maximized.

<Radial force component>
First, the effect of surface roughness on the radial force component is verified.
The three cutting inserts 10A to 10C are sequentially attached to the tool body 30A, and as shown in FIG. By applying a load of , an external force simulating the cutting resistance to the cutting inserts 10A to 10C during vertical wall processing was used, and the influence of surface roughness was evaluated from the degree of displacement of each cutting insert 10A to 10C with respect to the tool body 30A.

12(a) to (c) show the cutting insert 10A with respect to the load (horizontal axis of the graph, unit N) in each of (a) the long side constraining portion, (b) the bottom constraining portion, and (c) the short side constraining portion. 10 is a graph showing the relationship between rotational displacement amounts (displacement amount, graph vertical axis, unit μm) from 10C to 10C.
As shown in FIGS. 12(a) to 12(c), any of the cutting inserts 10A to 10C causes a change (misalignment) with respect to the tool body 30A when the load exceeds 200N, and the displacement amount is around 600N. became maximum.

The restraining portions 15a and 35a on the seating side are surfaces along the radial direction (the direction indicated by the arrow P in FIG. 11) in which a load is applied, and a force perpendicular to the direction in which they are fitted to each other acts. Therefore, as shown in FIG. 12(b), the displacement amounts of the bottom constraining portions 15a and 35a varied depending on the surface roughness of the cutting inserts 10A to 10C. The displacement amount (rotational displacement amount) increased in the order of 1.00 μm, 0.16 μm, and 3.10 μm for the arithmetic mean height Ra of the bottom surface constraining portion 15a.

Also, regarding the short-side restraint portions 15c and 35c, when a load is applied in the direction indicated by arrow P in FIG. 11, the load may be applied obliquely as indicated by arrow Q in FIG. 12(b) and 12(c), the arithmetic mean height Ra of the short-side constraining portions 15c and 35c is 0.16 μm, 1.00 μm and 3.10 μm in the order of displacement (rotational displacement). ) became larger.

Regarding the long side constraining portions 15b and 35b, as shown in FIG. There was no significant difference in the amount of displacement among the cutting inserts 10A to 10C (arithmetic mean height Ra: 0.16 μm, 1.00 μm, 3.10 μm).
The reason for this is that the cutting inserts 10A to 10C exhibit a behavior in which the clockwise rotation and the long side constraining side are lifted in a front view due to the radial component force, so that the long side constraining portion 15b of the cutting inserts 10A to 10C and the tool body It is considered that the influence of surface roughness is reduced because the contact area of 30A with the long side restraint portion 35b is reduced.

Among the cutting inserts 10A to 10C, the cutting insert 10B has the smallest amount of displacement in each of the long-side constrained portion 15b, the bottom-side constrained portion 15a, and the short-side constrained portion 15c. The arithmetic mean height Ra of each restraining portion 15a to 15c of the cutting insert 10B is 1.00 μm, which is closest to the arithmetic mean height Ra (1.10 μm) on the side of the tool body 30A. Therefore, it is considered that the contact area with the tool body 30A is increased, and the fitting strength is increased, resulting in the smallest displacement. Among the cutting inserts 10A to 10C, the cutting insert 10C with the arithmetic average height Ra of 3.10 μm had the largest amount of displacement.

<Axial load>
Next, the effect of surface roughness on axial load is verified.
As shown in FIG. 7(b), by pressing a jig from the tip side of the cutting tool 100 to the tip of the cutting insert and applying a load in the axial direction, an external force simulating the cutting resistance to the cutting inserts 10A to 10C is obtained. , the influence of surface roughness was evaluated from the degree of displacement of each cutting insert 10A to 10C with respect to the tool body 30A.

FIGS. 13(a) to (c) show (a) the long-side constraining portion, (b) the bottom-side constraining portion, and (c) the short-side constraining portion, respectively. 4 is a graph showing the relationship between the amount of rotational displacement (vertical axis of graph, unit: μm) of inserts 10A to 10C.
As shown in FIGS. 13(a) to 13(c), any of the cutting inserts 10A to 10C changes (shifts) with respect to the tool body 30A when the load exceeds 200N, and the displacement amount is around 600N. became maximum.

As shown in FIG. 13(a), regarding the long side constraining portion 15b, regardless of the cutting inserts 10A to 10C (arithmetic mean height Ra: 0.16 μm, 1.00 μm, 3.10 μm), each cutting insert 10A No significant difference was seen in displacements at ~10C.
As shown in FIG. 13(b), with respect to the restraining portions 15a and 35a on the seating surface side, a difference in the amount of displacement occurred due to the surface roughness of the cutting inserts 10A to 10C. Arithmetic mean height Ra of long side constraining portion 15b and bottom constraining portion 15a increased in order of 1.00 μm, 0.16 μm, and 3.10 μm.

On the other hand, no significant difference in surface roughness was observed between the short-side constraining portions 15c of the cutting inserts 10A to 10C and the short-side constraining portions 35c of the tool body 30A. As shown in FIG. 13(c), in the cutting inserts 10A to 10C (whatever the surface roughness of the short side constraining portions 15c and 35c is), each cutting insert 10A to 10C (arithmetic mean height Ra: 0.16 μm, 1.00 μm, and 3.10 μm), there was no large difference in the amount of displacement.

The reason is that the cutting inserts 10A to 10C exhibit a behavior in which the short side constraining portion 15c is lifted by rotating counterclockwise in front view due to the axial component force, so that the short side constraining portion of the cutting inserts 10A to 10C 15c and the short-side constraining portion 35c of the tool body 30A are reduced in contact area, so that the influence of the surface roughness is reduced.

Among the cutting inserts 10A to 10C, the cutting insert 10B has the smallest amount of displacement in each of the long-side constraining portion 15b, the bottom-side constraining portion 15a, and the short-side constraining portion 15c. The arithmetic mean height Ra of each of the restraining portions 15a to 15c of the cutting insert 10B is all 1.00 μm, and as shown in FIG. 10(b), the arithmetic mean height Ra (1.10 μm ). Further, the score angles θ1 to θ3 of the machining creases 16a to 16c of the cutting insert 10B are all 90°, which are equal to the score angles θ4 to θ6 of the machining creases 36a to 36c of the tool body 30A. For this reason, the fitting depth of the unevenness is increased, the contact area between each of the restraining portions 15a to 15c of the cutting inserts 10A to 10C and each of the restraining portions 35a to 35c of the tool body 30A is increased, and the mutual fitting strength is increased. It is considered that the amount of displacement became the smallest due to the increase in (fixed limit resistance). Among the cutting inserts 10A to 10C, the cutting insert 10C with the arithmetic average height Ra of 3.10 μm had the largest amount of displacement. A possible reason for this is that the recesses and protrusions have the smallest fitting depth.

From the above results, the amount of rotational displacement of the cutting inserts 10A to 10C with respect to the tool body 30A for both the radial component force and the axial load is the arithmetic mean height A combination of values close to each other in Ra was the best. That is, when the arithmetic mean height Ra of each restraining portion 35a to 35c of the tool body 30A is 1.10 μm, the amount of displacement with respect to the tool body 30A is 1.00 μm for the arithmetic mean height Ra of each restraining portion 15a to 15c. of the cutting insert 10B resulted in the smallest result.

In addition, regardless of the load from the radial direction or the load from the axial direction, the cutting inserts 10A to 10C of the above-described Example 1 are compared with the cutting insert of the comparative example (conventional product) without machining streaks at any restraint part. It was also found that the amount of displacement with respect to the tool body 30A was greatly suppressed. When a force component is applied in the radial direction, the cutting insert (Ra: 1.10 μm) closer to the arithmetic mean height (Ra: 1.00 μm) on the side of the tool body 30A suppresses the amount of displacement. Moreover, when the load was applied in the axial direction, a significant difference from the comparative example appeared regardless of the surface roughness value in any of the restraining portions 15a to 15c. In addition, the amount of displacement was considerably smaller than that of the comparative example, regardless of the surface roughness value, with respect to the load acting from the same direction as the fitting direction of the restraining portions.

In the cutting insert of the comparative example, the amount of displacement increases from around 200 N of applied load regardless of the radial direction and the axial direction. The amount of displacement for Almost the same amount of displacement was confirmed in all of the long-side constrained portion, the short-side constrained portion, and the bottom constrained portion of the cutting insert of the comparative example having no machined streaks in both the radial force component and the axial load.

Therefore, in order to suppress the displacement of the cutting inserts 10A to 10C with respect to the tool body 30A, the tool body 30A and the cutting inserts 10A to 10C are restricted by the restraining portions 35a to 35c, 15a to 15c. It was found that the closer the surface roughness of the cutting inserts 10A to 10c side to the arithmetic mean height (Ra: 1.00 μm) of the tool body 30A side, the more effective it is. When the arithmetic mean height Ra of the cutting inserts 10A to 10C and the tool body 30A is about 1.0, each of the restraining portions 35a to 35c and 15a to 15c of the tool body 30A and the cutting inserts 10A to 10C are macroscopically engaged with each other. Even against the load acting from a direction different from the direction in which each of the restraining portions 35a to 35c and 15a to 15c are fitted to each other, it is restrained by fine unevenness (processed lines 36a to 36c, 16a to 16c) that can be combined. High mating force can be obtained. In addition, since the score angles θ1 to θ3 of the cutting inserts 10A to 10C are equal to the score angles θ4 to θ6 of the tool body 30A, the fitting depth of the recesses and protrusions between the machining score 16a to 16c and 36a to 36c is increased, The amount of rotational displacement on the side of the cutting inserts 10A to 10C was further suppressed.

[Verification of the influence of the processing streak direction]
Next, the direction of the machining creases 16a to 16c (score angles θ1 to θ3) of the cutting inserts 10D, 10E, 10F, and 10G according to the present invention and the direction of the machining creases 36a to 36c (score angle θ4) of the tool body 30A ˜θ6) is verified to what extent it affects the shift movement (displacement amount) of the cutting inserts 10D to 10G with respect to the tool body 30A.

As cutting insert samples of Example 2, cutting inserts 10D to 10G under the conditions shown in Table 2 were prepared. Here, four cutting inserts were prepared in which the directions of the grooves 16a to 16c (the groove angles .theta.1 to .theta.4) are different from each other.
"Cutting inserts 10D to 10G"
・Arithmetic average height Ra: unified at 1.00 μm ・Streak direction of processed streaks 16a to 16c (streak angle θ1 to θ3): 0°, 45°, 90°, 135°

<Radial force component>
The prepared four cutting inserts 10D to 10G are attached in order to the tool body 30A, and as shown in FIG. By applying a predetermined load to each cutting insert 10D to 10G, the load during cutting was reproduced, and the influence of the crease direction was evaluated from the degree of displacement of each cutting insert 10D to 10G with respect to the tool body 30A.

14(a) to (c) show the radial component force (horizontal axis of the graph, unit N) in each of (a) the long side constraining portion, (b) the bottom constraining portion, and (c) the short side constraining portion. 4 is a graph showing the relationship between the amounts of rotational displacement of cutting inserts 10D to 10G (vertical axis of graph, unit: μm).
As shown in FIG. 14(a), in the long side constraining portion 15b of the cutting inserts 10D to 10G, the score angle θ2 representing the score direction of the machining score 16b can be any score angle (0°, 45°, 90°, 135° °), the amount of displacement of the cutting inserts 10A to 10D with respect to the long side constraining portion 35b of the tool body 30A is small, and the variation among the cutting inserts 10D to 10G is small. That is, regarding the long-side constraining portions 15b and 35b, it can be said that the direction of the grooves between the machining grooves 16b and 36b (magnitude of the groove angle θ2) has little influence on the displacement amount of the cutting inserts 10D to 10G.

On the other hand, as shown in FIG. 14(b), in the bottom constrained portion 15a of the cutting inserts 10D to 10G, the score angle θ1 representing the score direction of the machining score 16a is 90°, 135°, The amount of displacement relative to the tool body 30A increased in the order of 45° and 0°.
Further, as shown in FIG. 14(c), in the short-side constraining portions 15c of the cutting inserts 10D to 10G, the crease angle θ3 representing the crease direction of the machining crease 16c is 90°, 135°, 0°, and 45°. In order, the amount of displacement with respect to the tool main body 30 became large.

As described above, even if the surface roughnesses of the restraining portions 35a to 35c and 15a to 15c between the tool body 30A and the cutting inserts 10D to 10G are close to each other, the contact area will decrease if the direction of the creases is deviated. It was found that sufficient binding force could not be obtained. In any of the bottom constraining portions 35a, 15a and the short side constraining portions 35c, 15c, the crease angles θ1, θ3 are the same as the creases of the bottom constraining portions 35a and the short side constraining portions 35c of the tool body 30A regardless of the magnitude of the load. When the angles θ4 and θ6 are 90°, the amount of displacement with respect to the tool body 30A is small. That is, the smaller the difference in the crease direction (angle) between the cutting inserts 10D to 10G and the restraining portions 15a to 15c and 35a to 35c of the tool body 30A, the deeper the engagement between the recesses and protrusions and the larger the mutual contact area. It is considered that the restraining force is increased by the cutting insert 10, and the degree of influence on the amount of displacement of the cutting insert 10 is also reduced.

<Axial load>
As shown in FIG. 7(b), by pressing a jig 51 from the tip side of the cutting tool 100 onto the tips of the cutting inserts 10D to 10G to apply a load in the axial direction, the cutting force on the cutting inserts 10D to 10G is reduced. Using a simulated external force, the effect of surface roughness was evaluated from the degree of displacement of each of the cutting inserts 10D to 10G with respect to the tool body 30A.

FIGS. 15(a) to (c) show (a) the long-side constraining portion, (b) the bottom-side constraining portion, and (c) the short-side constraining portion, respectively. 4 is a graph showing the relationship between the amount of rotational displacement (vertical axis of graph, unit: μm) of inserts 10D to 10G.
As shown in FIGS. 15A to 15C, any of the cutting inserts 10D to 10G changes (shifts) with respect to the tool body 30A when the load exceeds 200N, and the amount of displacement is around 600N. became maximum.

As shown in FIG. 15(c), with regard to the short-side constraining portions 15c of the cutting inserts 10D to 10G, no significant difference according to the crease angles θ1 to θ3 could be confirmed. As described above, the cutting inserts 10D to 10G exhibit a behavior in which the short side constraining portion 15c is lifted by rotating counterclockwise in a front view due to an axial component force. It is considered that the contact area between the restraining portion 15c and the short-side restraining portion 35c of the tool body 30A is reduced, thereby reducing the influence of the crease angle.

On the other hand, in the long side constraining portions 15b, 35b and the bottom constraining portions 15a, 35a, the crease direction of the tool body 30A and the load direction acting on the long side constraining portions 15b, 35b and the bottom constraining portions 15a, 35a are It is thought that the difference was caused by the joint angle because the relationship was close to orthogonal. The amount of displacement decreased in the order of 135°, 0°, and 45° in the direction of the knot, and the amount of displacement was the smallest mainly when the direction was 90°.

From the above results, in both the radial component force and the axial load, the deviation (displacement amount) of the cutting inserts 10D to 10G with respect to the tool body 30A can The smallest results were obtained when the directions were the same (here at 90° to each other).

In addition, regardless of the load from the radial direction or the load from the axial direction, when comparing the cutting inserts of the comparative example (conventional product) without machining streaks, the cutting inserts 10D to 10G of the above-mentioned example 2 have any restraint part Also, it was found that the amount of displacement with respect to the tool body 30A was greatly suppressed.

FIG. 16 is a diagram showing the relationship between the shearing direction acting on the short-side constraining portions 15c and 35c and the machining creases 16c and 36c. In (c), the crease angle θ3 of the cutting inserts 10D to 10G is 135°. The crease angle θ6 of the tool body 30 is 90°.

As shown in FIG. 14(c), when a load is applied to the short side constraining portion 15c from the radially outer side of the cutting inserts 10D to 10G, when the crease angle θ3 of the short side constraining portion 15c is 45°, , the amount of displacement with respect to the tool body 30A with the crease angle θ6 of 90° was the largest.
This is because, as shown in FIG. 16(a), the crease angle of the short side constraining portion 15c on the side of the cutting inserts 10D to 10G with respect to the short side constraining portion 35c (score angle θ6: 90°) on the tool body 30A side is When θ3 is 45°, the shearing direction acting on the short-side constraining portions 15c and 35c (the direction indicated by arrow Q in the figure) and the direction of the machining creases 16c of the cutting inserts 10D to 10G are substantially parallel, It is conceivable that the fitting depth of the recesses and protrusions became smaller and the restraining force between the short side restraining portions 15c and 35c weakened.

On the other hand, as shown in FIG. 16(b), when the score angle θ3 of the cutting inserts 10D to 10G is 135°, the displacement relative to the tool body 30A is smaller than when the score angle θ3 is 45°. This is because when the score angle θ3 is 135°, the fitting depth of the unevenness is greater than when the score angle θ3 is 45°, and the machining score 16c and 36c are fitted in the direction orthogonal to the shearing direction. It is conceivable that the increased area increased the restraining force between the short side restraining portions 15c and 35c.

According to the above-described Examples 1 and 2, when there is no processing line as in the comparative example and the restraint of the cutting insert and the restraint portion of the tool body are mutually flat surfaces, the cutting insert is dislodged due to the cutting load during cutting. Easy to slip and move relative to the tool body. Therefore, it is conceivable to increase the binding force by forming an uneven shape on the seating surface or side surface of the cutting insert. It may affect the blade shape. Moreover, between the cutting insert and the tool body, it is necessary to ensure the fitting strength by fitting the concave and convex shapes of the restraining portions to each other. That is, the cutting insert must be attached to the tool body with high accuracy so that the recesses and projections of the constrained portion of the cutting insert and the constrained portion of the tool body are fitted to each other.
However, it is difficult to accurately fit and attach the three restraint portions of the cutting insert to the three restraint portions of the tool body. If there is even one set of surfaces that do not fit with good accuracy, the cutting insert will be inclined with respect to the tool body.

Therefore, as in the above-described embodiment, the machining creases 16a formed of fine uneven shapes having microscopic orientations are applied to the restraining portions 15a to 15c and 35a to 35c of the cutting inserts 10A to 10G and the tool body 30A. 16c are formed with fine dimensions of several μm, and the angles formed by the mutual processing lines 16a to 16c are within the range of 0° ≤ θ ≤ 5°, so that the unevenness of each other is reduced. The area to be fitted is increased. This facilitates the positioning of the cutting inserts 10A-10G with respect to the tool body 30A, and enables macroscopic mounting of the cutting inserts 10A-10G with respect to the tool body 30A. Therefore, it is possible to easily replace the cutting inserts 10A to 10G.

As described above, as a result of Examples 1 and 2, in the case of combinations in which the surface roughness values of the restraining portions 15a to 15c and 35a to 35c are close between the cutting inserts 10A to 10G and the tool body 30A, , the contact area of the contact surface roughness increases and the coefficient of static friction becomes maximum, so it is possible to suppress the amount of rotational displacement of the cutting inserts 10A to 10G with respect to the tool body 30A.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope of the technical idea described in the claims, and these are also within the technical scope of the present invention. be understood to belong to You may combine the structure of each embodiment suitably.

For example, the shape of the cutting insert is not limited to the shapes illustrated in the above embodiments. A square shape, a parallelogram shape, or the like may be used instead of the rectangular shape in plan view.

REFERENCE SIGNS LIST 10 (10A, 10B, 10C, 10D, 10E, 10F, 10G)... Cutting insert 13... Seating surface 12... Rake surface 14... Side surface 15a, 15b, 15c... Restricted portion of cutting insert 35a, 35b, 35c... Tool body Constraint part 16a, 16b, 16c... Machining score of cutting insert 36a, 36b, 36c... Machining score of tool body 30 (30A)... Tool body 31... Insert pocket (pocket)
33a... Mounting seat 33b... Long side mounting side (mounting side)
33c... short side mounting side (mounting side)
100...Cutting tool JO...Rotating axis ?...Angle formed by the machining score of the cutting insert and the machining score of the tool body

Claims (4)

A cutting tool in which a cutting insert is attached to a tool body that rotates around a rotation axis,
The cutting insert has a rake surface and a seating surface, and a side surface including a flank connects the rake surface and the seating surface,
the tool body has one or more pockets at one end, the pockets having a mounting seat and one or more mounting side surfaces angled with respect to the mounting seat;
The seating surface, the side surface, the mounting seat, and the mounting side surface each have a restraining portion,
All of the restraining portions are formed with processing streaks having a constant period of 0.05 μm≦Ra≦6.30 μm,
With the cutting insert attached to the tool body,
An angle θ between the machining score of the cutting insert and the machining score of the tool body in each restraint portion is 0°≦θ≦5°,
A cutting tool characterized by: The processing lines are formed by grinding,
The cutting tool according to claim 1, characterized by: having a pair of a rake face and a seating surface, wherein the rake face and the seating surface are connected by a side surface including a flank,
The seating surface and the side surfaces each include a restraining portion, and
The constraining portion is formed with processing streaks of a constant period of 0.05 μm≦Ra≦6.30 μm,
A cutting insert characterized by: A tool body that rotates around a rotation axis,
The tool body has one or more pockets at one end,
the pocket includes a mounting seat and one or more mounting side surfaces angled with respect to the mounting seat;
The mounting seat and the mounting side surface each have a restraining portion, and
The constraining portion is formed with processing streaks having a constant period of 0.05 μm≦Ra≦6.30 μm.
A tool body characterized by:

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