JP7223773B2 - Manufacturing method for rotary tool and cut product - Google Patents

Description

Cross-reference to related applications

This application claims priority from Japanese Patent Application No. 2018-241817 filed on December 25, 2018, and the entire disclosure of this earlier application is incorporated herein for reference.

This aspect generally relates to a method of manufacturing a cutting tool and a cut product used for cutting a work material. Specifically, it relates to a rotary tool used for milling and other milling.

As a cutting tool used when cutting a work material such as metal, for example, there are milling tools described in Japanese Patent Application Laid-Open No. 2014-046436 (Patent Document 1) and International Publication No. 2012/104832 (Patent Document 2). known. Each of the milling tools described in US Pat. In addition, in the description below, the cutting insert may simply be referred to as an insert.

For example, the insert described in Patent Document 2 has contact surfaces 78,80. The pocket also has locating surfaces 66, 68 and a central region 70, respectively, located rotationally rearwardly with respect to the insert. A portion of the pocket formed by the positioning surfaces 66, 68 and the central region 70 has a generally convex shape when viewed from the side.

As in the milling tool described in Patent Document 2, when the surface positioned rearward in the rotational direction with respect to the insert has a convex shape as a whole when viewed from the side, both of the positioning surfaces 66 and 68 are brought into contact with each other. Contacting the surfaces becomes difficult and, for example, the contact surface 80 may move away from the positioning surface 68 . Possible causes of this include manufacturing errors of the pocket and deformation of the pocket due to repeated cutting. Also, due to manufacturing errors in the insert and pocket, it was difficult to bring the positioning surface 66 into surface contact with the contact surface 80 .

The separation of contact surface 80 from locating surface 68 or the difficulty of bringing locating surface 66 into surface contact with contact surface 80 can result in unstable retention of the insert in the pocket.

A non-limiting one-sided rotary tool in the present disclosure includes a holder, an insert , and a screw . The holder has a cylindrical shape extending from a first end to a second end along the axis of rotation and has a pocket located at the first end. An insert is located in the pocket. The insert has an outer peripheral surface, an inner peripheral surface, a first surface, a second surface, a cutting edge , and a through hole . The outer peripheral surface has a substantially triangular shape, is located on the outer peripheral side of the holder, and has a first side and a second side. The inner peripheral surface is located on the opposite side of the outer peripheral surface and contacts the pocket. The second side is located behind the first side in the direction of rotation of the rotating shaft. The first surface is located between the outer peripheral surface and the inner peripheral surface and is connected to the first side. The second surface is located between the outer peripheral surface and the inner peripheral surface and is connected to the second side. The cutting edge is located on the first side. The through holes are open on the outer peripheral surface and the inner peripheral surface, and screws are inserted therein. The outer peripheral surface has a third side adjacent to the first side and the second side, a first corner positioned between the first side and the second side, and a second corner positioned between the second side and the third side. It further has a corner and a third corner located between the first side and the third side. The insert further has a third surface located between the outer peripheral surface and the inner peripheral surface and connected to the third side, the first corner being closer to the second end than the second and third corners. Situated on the side, it is placed in the pocket.

The second side has a flat portion. The pocket has a screw hole and a recess. A screw is inserted into the screw hole. The recessed portion is located at a location facing the second surface and has a recessed shape when viewed from the side . The recess has a bottom, a first region, and a second region. The first region is located forward in the rotational direction of the bottom portion and is inclined with respect to the flat portion when viewed from the side. The second region is positioned behind the bottom in the rotational direction and is inclined with respect to the flat portion when viewed from the side. The first region has a first portion that contacts the second surface. The second region has a second portion that contacts the second surface. The bottom separates from the second surface. The first portion is positioned closer to the second end than the second portion. At least part of the first portion is located forward in the rotational direction of the central axis of the through hole.

1 is a perspective view of a non-limiting one-sided rotary tool of the present disclosure; FIG. 2 is an enlarged view of an area A1 shown in FIG. 1; FIG. 2 is a front view of the rotary tool shown in FIG. 1 looking toward the first end; FIG. FIG. 4 is a side view of the rotary tool shown in FIG. 3 as seen from the B1 direction; 5 is an enlarged view of an area A2 shown in FIG. 4; FIG. FIG. 6 is an enlarged view of a holder in the rotary tool shown in FIG. 5; FIG. 4 is a side view of the rotary tool shown in FIG. 3 as seen from a direction B2; 8 is an enlarged view of an area A3 shown in FIG. 7; FIG. FIG. 9 is an enlarged view of a holder in the rotary tool shown in FIG. 8; FIG. 2 is a perspective view of an insert in the rotary tool shown in FIG. 1; Figure 11 is a perspective view of the insert shown in Figure 10; FIG. 3 is an enlarged view of a non-limiting one-sided holder of the present disclosure; FIG. 3 is an enlarged view of a non-limiting one-sided holder of the present disclosure; FIG. 3 is an enlarged view of a non-limiting one-sided holder of the present disclosure; FIG. 3 is an enlarged view of a non-limiting one-sided holder of the present disclosure; 1 is a schematic diagram illustrating one step of a non-limiting one-sided machined workpiece manufacturing method in the present disclosure; FIG. 1 is a schematic diagram illustrating one step of a non-limiting one-sided machined workpiece manufacturing method in the present disclosure; FIG. 1 is a schematic diagram illustrating one step of a non-limiting one-sided machined workpiece manufacturing method in the present disclosure; FIG.

Hereinafter, cutting tools according to non-limiting embodiments of the present disclosure will be described in detail with reference to the drawings. However, in each drawing referred to below, for convenience of explanation, only main members necessary for explaining each embodiment are shown in a simplified manner. Accordingly, the cutting tools disclosed below may comprise optional components not shown in the referenced figures. Also, the dimensions of the members in each drawing do not faithfully represent the actual dimensions of the constituent members, the dimensional ratios of the respective members, and the like.

Examples of cutting tools include turning tools used for turning and rotary tools used for turning. Rotary tools may also include, for example, drills and milling tools. FIG. 1 shows a milling tool 1 as an example of a cutting tool. However, the cutting tool is not limited to the milling tool 1 .

A rotary tool 1 (milling tool 1) of a non-limiting embodiment of the present disclosure may have a holder 3 and an insert 5 (cutting insert 5). The holder 3 may have a cylindrical shape extending from the first end 3a to the second end 3b along the rotation axis O1. The first end 3a may be called the front end, and the second end 3b may be called the rear end. The rotary tool 1 is rotatable around the rotation axis O1 in the process of cutting a work material to manufacture a machined product. Note that the arrow X in FIG. 1 and the like indicates the rotating direction of the rotary tool 1 .

Materials for the holder 3 may include steel and cast iron. In particular, from the viewpoint of increasing the toughness of the holder 3, steel may be used among these materials.

The holder 3 may have one or more pockets 7 located at the first end 3a. The number of pockets 7 is not particularly limited, and may be one or more. The holder 3 in one non-limiting example shown in FIG. 3 has three pockets 7 . The holder 3 does not have to be strictly cylindrical, as is evident from the fact that it can have a pocket 7 and the like.

The holder 3 may have a plurality of pockets 7 in which inserts 5 are located respectively. Each insert 5 may be located on the side of the first end 3a of the rotary tool 1, as in one non-limiting example shown in FIG.

The pocket 7 is a portion in which the insert 5 is mounted, and may be open to the end surface located at the first end 3 a of the holder 3 and the outer peripheral surface 13 . In one non-limiting example shown in FIG. 3 , the rotary tool 1 may have three inserts 5 since the holder 3 has three pockets 7 . The insert 5 may directly contact the pocket 7 or a sheet may be sandwiched between the insert 5 and the pocket 7 . The insert 5 may be brazed to the holder 3 or may be removable.

When the rotary tool 1 has a plurality of inserts 5, these inserts 5 may have the same shape or different shapes. Moreover, when the holder 3 has a plurality of pockets 7, these pockets 7 may have the same shape or different shapes.

As for the material of the insert 5, a material having a higher hardness than that of the holder 3 is generally used. Specifically, cemented carbide, cermet, and the like can be mentioned as the material of the insert 5, for example. Cemented carbide compositions may include, for example, WC-Co, WC-TiC-Co and WC-TiC-TaC-Co. Here, WC, TiC and TaC are the hard particles and Co is the binder phase.

A cermet is a sintered composite material in which a metal is combined with a ceramic component. An example of a cermet may be a titanium compound based on titanium carbide (TiC) or titanium nitride (TiN). However, it goes without saying that the material of the first insert 91 is not limited to the composition described above.

The surface of the insert 5 may be coated with a coating using a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method. The composition of _the coating may include titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), alumina ( _Al2O3 ), and the like.

One of the plurality of inserts 5 that the rotary tool 1 has is referred to as a first insert 9 . Moreover, let the pocket 7 in which the 1st insert 9 is located among the several pockets 7 be the 1st pocket 11. As shown in FIG.

The first insert 9 in non-limiting embodiments of the present disclosure may have an outer peripheral surface 13 , a first surface 15 and a second surface 17 . The outer peripheral surface 13 may be polygonal with multiple corners and multiple sides, as shown in FIG. Perimeter surface 13 in one non-limiting example shown in FIG. 10 may be generally triangular with three corners and three sides.

The three corners and three sides of the outer peripheral surface 13 may be positioned so as to have 120° rotational symmetry with respect to the center of the outer peripheral surface 13 when the outer peripheral surface 13 is viewed from the front. Note that the polygonal shape is not strictly limited to a polygonal shape. For example, the three sides of the first surface 15 do not have to be strictly straight lines. Further, the center of the outer peripheral surface 13 can be specified by, for example, the position of the center of gravity of the outer peripheral surface 13 in the front view of the outer peripheral surface 13 .

Perimeter surface 13 in one non-limiting example shown in FIG. 10 may have first corner 19 , first side 21 and second side 23 . First side 21 and second side 23 may each extend from first corner 19 . In other words, first corner 19 may be located between first side 21 and second side 23 . The second side 23 may be located behind the first side 21 in the rotation direction X of the rotation axis O1.

The first surface 15 and the second surface 17 may be adjacent to the outer peripheral surface 13 respectively. The first surface 15 may be connected to the first side 21 . The second face 17 may be connected to the second side 23 . If the first side 21 and the second side 23 respectively extend from the first corner 19, the first surface 15 and the second surface 17 may intersect each other.

The outer peripheral surface 13 may further have a second corner 25, a third corner 27 and a third side 29, as a non-limiting example shown in FIG. The third side 29 may be connected to the first side 21 on the side opposite to the second side 23 . A third corner 27 may be located between the first side 21 and the third side 29 . In the non-limiting example shown in FIG. 10 , when the outer peripheral surface 13 is substantially triangular, the third side 29 may connect to the second side 23 on the side opposite to the first side 21 . A second corner 25 may be located between the second side 23 and the third side 29 .

The first insert 9 may further have a third face 31 connected to the third edge 29 . The third surface 31 may intersect with each of the first surface 15 and the second surface 17 . Also, the first insert 9 may further have an inner peripheral surface 33 located opposite the outer peripheral surface 13 . The inner peripheral surface 33 may be parallel to the outer peripheral surface 13 . The inner peripheral surface 33 may have a polygonal shape with multiple corners and multiple sides, similar to the outer peripheral surface 13 .

At this time, the inner peripheral surface 33 may have the same shape as the outer peripheral surface 13 . When the first insert 9 has a polygonal outer peripheral surface 13 and an inner peripheral surface 33 as in a non-limiting example shown in FIGS. 10 and 11, the first insert 9 may have a polygonal plate shape. First surface 15, second surface 17 and third surface 31 in one non-limiting example shown in FIGS. 10 and 11 may be located between outer surface 13 and inner surface 33, respectively. Also, the inner peripheral surface 33 may abut on the first pocket 11 .

The outer peripheral surface 13 and the inner peripheral surface 33 are not limited to the above shapes. In one non-limiting example, shown in FIGS. 10 and 11, outer peripheral surface 13 and inner peripheral surface 33 are generally triangular. However, the outer peripheral surface 13 and the inner peripheral surface 33 may also be, for example, square, pentagonal, hexagonal or octagonal, respectively.

The maximum width when the outer peripheral surface 13 is viewed from the front may be, for example, 6 mm or more and 25 mm or less. Moreover, the height from the outer peripheral surface 13 to the inner peripheral surface 33 may be, for example, 1 mm or more and 10 mm or less. Here, the height from the outer peripheral surface 13 to the inner peripheral surface 33 may mean the maximum value of the distance in the direction parallel to the central axis passing through the center of the outer peripheral surface 13 and the center of the inner peripheral surface 33 .

The first insert 9 in a non-limiting embodiment of the present disclosure may have a cutting edge 35 . The cutting edge 35 may have a role of cutting a work material during cutting of the work material for manufacturing a machined product. The cutting edge 35 in one non-limiting example shown in FIG. 10 may have a first cutting edge 35a. The first cutting edge 35 a may be positioned on the first side 21 . It should be noted that the first cutting edge 35a does not need to be located on the entire first side 21, and may be located only on a part of the first side 21. FIG.

At least a portion of the first cutting edge 35a may be located further from the rotation axis O1 than the outer circumference of the holder 3. In other words, at least a part of the first cutting edge 35a may be located outside the outer circumference of the holder 3 .

The cutting edge 35 may further have a second cutting edge 35b as shown in FIG. A non-limiting example second cutting edge 35 b shown in FIG. 10 may be located at the intersection of the first surface 15 and the third surface 31 . It should be noted that the second cutting edge 35b does not need to be positioned over the entire intersection, and may be positioned only in part of the intersection.

At least a portion of the second cutting edge 35b may be located further from the second end 3b than the end face located at the first end 3a of the holder 3. In other words, at least part of the second cutting edge 35 b may protrude from the holder 3 .

In the rotary tool 1 of the non-limiting embodiment of the present disclosure, the first cutting edge 35a can function as a so-called peripheral cutting edge. Also, the second cutting edge 35b can function as a so-called bottom edge.

The first face 15 may have a rake face region 37 including regions along the first cutting edge 35a and the second cutting edge 35b. The rake face region 37 can function as a rake face with which chips come into contact during cutting using the first cutting edge 35a and the second cutting edge 35b. The rake face region 37 may be the entire first face 15, or may be only a portion of the first face 15 including the regions along the first cutting edge 35a and the second cutting edge 35b. .

The outer peripheral surface 13 may have a first flank area 39 that includes an area along the first cutting edge 35a. The third face 31 may also have a second flank region 41 that includes a region along the second cutting edge 35b. The first flank region 39 and the second flank region 41 can function as flanks when performing cutting using the first cutting edge 35a and the second cutting edge 35b. The first flank area 39 may be the entire outer peripheral surface 13 , and the second flank area 41 may be the entire third surface 31 .

When the second side 23 is located behind the first side 21 in the rotation direction X, the second surface 17 may be located behind the first surface 15 in the rotation direction X. The second surface 17 may abut the pocket 7 . When the second surface 17 abuts against the pocket 7 , the principal component of force generated when performing cutting using the first cutting edge 35 a mainly moves from the first insert 9 to the holder 3 on the second surface 17 . Easy to convey.

The second surface 17 may have a flat portion 17a. This flat portion 17 a can function as a surface that contacts the pocket 7 . The pocket 7 may have a recess 43 that has a recessed shape when viewed from the side. The recess 43 may be located at a location facing the second surface 17 . Specifically, the recess 43 may face the flat portion 17a. When the concave portion 43 faces the second surface 17 , the main component of force is likely to be transmitted mainly from the second surface 17 to the concave portion 43 .

The recess 43 in non-limiting embodiments of the present disclosure may have a bottom 45 , a first region 47 and a second region 49 . The first region 47 may be located forward of the bottom portion 45 in the rotation direction X and may be inclined with respect to the flat portion 17a when viewed from the side. Therefore, the first region 47 may approach the second surface 17 as it separates from the bottom portion 45 . The second region 49 may be positioned behind the bottom portion 45 in the rotation direction X and may be inclined with respect to the flat portion 17a when viewed from the side. Therefore, the second region 49 may approach the second surface 17 as it separates from the bottom portion 45 .

The recess 43 in a non-limiting embodiment of the present disclosure may abut the first insert 9 . At this time, the first region 47 and the second region 49 may abut the first insert 9 . In other words, the first region 47 may have a first portion 47a that abuts the flat portion 17a. The second region 49 may have a second portion 49a that abuts the flat portion 17a. The first region 47 and the second region 49 may abut the first insert 9 while the bottom 45 is away from the first insert 9 .

When the first insert 9 and the pocket 7 are configured as described above, even if a manufacturing error of the pocket 7 or deformation of the pocket 7 due to repeated cutting work occurs, the first portion 47a and the second portion 49a are likely to come into contact with the first insert 9 . A first portion 47 a and a second portion 49 a are spaced apart from each other with a bottom portion 45 therebetween, and the bottom portion 45 is spaced from the first insert 9 . Therefore, the first portion 47a and the second portion 49a can easily abut the first insert 9 stably. As a result, the first insert 9 can be stably held by the holder 3 easily.

When the concave portion 43 is viewed from the side, the first region 47 and the second region 49 may approach the second surface 17 as they separate from the bottom portion 45 . Therefore, the first region 47 may be slanted with respect to the second region 49 . Here, when viewed from the side, the angle θ0 at which the first virtual line L1 extending the first region 47 and the second virtual line L2 extending the second region 49 intersect may be an obtuse angle.

During cutting, the main component force is transmitted mainly from the second surface 17 to the first region 47 and the second region 49 . When the angle θ0 is an obtuse angle, it is difficult for the load to concentrate on the bottom portion 45 located between the first region 47 and the second region 49 . Therefore, cracks are less likely to occur in the concave portion 43 . Therefore, the durability of the holder 3 is high. The angle θ0 can be set, for example, between 160° and 179.95°.

The first insert 9 may further have a through hole 51 opening in the outer peripheral surface 13, as shown in FIG. Note that the through hole 51 in the non-limiting example shown in FIGS. 10 and 11 may be formed from the center of the outer peripheral surface 13 toward the center of the inner peripheral surface 33 . At this time, the through hole 51 may be opened on the inner peripheral surface 33 . 10 and 11 is formed from the center of the outer peripheral surface 13 toward the center of the inner peripheral surface 33, as in the non-limiting example shown in FIG. A central axis O<b>2 of the hole 51 may coincide with the central axis of the first insert 9 .

The through-holes 51 can be used for inserting, for example, screws 53 when fixing the first insert 9 to the holder 3 . A screw 53 is inserted into the through-hole 51 of the first insert 9, the tip of the screw 53 is inserted into the screw hole formed in the pocket 7, and the screw 53 is fixed to the screw hole, thereby removing the first insert 9. It may be attached to the holder 3.

When fixing the first insert 9 to the holder 3, instead of the screw 53, for example, a clamp member may be used. Although the through hole 51 in the non-limiting example shown in FIGS. 10 and 11 is formed from the center of the outer peripheral surface 13 toward the center of the inner peripheral surface 33, the through hole 51 is not limited to such a configuration.

Further, when the first insert 9 has the through hole 51 described above, at least a part of the first portion 47 a may be positioned forward in the rotation direction X with respect to the central axis O2 of the through hole 51 . In this case, the main component of force is less likely to be applied to the screw 53 . In other words, it is easy for the first portion 47a to stably receive the main component force. Therefore, the durability of the screw 53 is high.

Further, when the first insert 9 has the through hole 51 described above, at least a portion of the second portion 49 a may be positioned closer to the first end 3 a than the central axis O2 of the through hole 51 . When performing cutting using the first cutting edge 35 a , a relatively large cutting load is likely to be applied to a portion of the first cutting edge 35 a near the first end 3 a of the holder 3 .

Therefore, when the second portion 49a is positioned as described above, it is easy for the second portion 49a to stably receive the main component force. Therefore, the main component of force is less likely to be applied to the screw 53, and the screw 53 has high durability.

The first region 47 and the second region 49 may each be flat, in other words flat. Also, the first region 47 and the second region 49 may be curved surfaces. When the first region 47 and the second region 49 are curved surfaces, the first region 47 and the second region 49 may be convex curved surfaces as shown in FIG. 12, or concave curved surfaces as shown in FIG. It may be curved. Also, the first region 47 and the second region 49 may have a configuration in which a plane portion, a convex curved surface portion, and a concave curved surface portion are combined. For example, as shown in FIG. 14, the first region 47 and the second region 49 may have a configuration in which convex curved surface portions and concave curved surface portions are combined.

Note that FIG. 12 is an enlarged view showing one holder 3 of a non-limiting embodiment of the present disclosure, and is a drawing corresponding to FIG. FIG. 13 is an enlarged view of the holder 3 of one non-limiting embodiment of the present disclosure, corresponding to FIG. FIG. 14 is an enlarged view of the holder 3 of one non-limiting embodiment of the present disclosure, corresponding to FIG.

When the first region 47 is flat, it is difficult for the above-mentioned principal component force to concentrate on a part of the first region 47 . Therefore, the durability of the first region 47 is high. Similarly, when the second region 49 is flat, the above-described principal component force is less likely to concentrate on a portion of the second region 49 . Therefore, the durability of the second region 49 is high.

Further, when the first region 47 has a convex surface shape, even when the pocket 7 is slightly deformed, the main component force can be stably received at the first portion 47a. Therefore, the durability of the first portion 47a is high. Similarly, when the second region 49 has a convex surface shape, even when the pocket 7 is slightly deformed, the main component force can be stably received at the second region 49a. Therefore, the durability of the second portion 49a is high.

One non-limiting example of the outer perimeter surface 13 shown in FIG. 2 may have a first corner 19 and a second corner 25 adjacent to the second side 23, as described above. When viewed from the side, the first corner 19 and the second corner 25 may each be separated from the recess 43 .

If the first corner 19 is away from the recess 43 , the first portion 47 a may be positioned away from the first corner 19 . At this time, chipping is less likely to occur in the vicinity of the first corner 19 when receiving the main component force at the first portion 47a. Similarly, when the second corner 25 is away from the recess 43, the second portion 49a may be located away from the second corner 25. At this time, chipping is less likely to occur in the vicinity of the second corner 25 when receiving the main component force at the second portion 49a.

The inclination angle of the first region 47 with respect to the flat portion 17a when viewed from the side is defined as a first angle θ1. Also, when viewed from the side, the inclination angle of the second region 49 with respect to the flat portion 17a is defined as a second angle θ2.

At this time, as shown in FIG. 15, the second angle θ2 may be larger than the first angle θ1. When the second angle θ2 is larger than the first angle θ1, the main component force is stably generated at the second portion 49a while ensuring a large angle θ0 at which the first virtual line L1 and the second virtual line L2 intersect. easy to accept. The above configuration is effective when a relatively large cutting load is applied to a portion of the first cutting edge 35a near the first end 3a of the holder 3 . Note that FIG. 15 is an enlarged view showing one holder 3 of a non-limiting embodiment of the present disclosure, and is a drawing corresponding to FIG.

Also, the first angle θ1 may be the same as the second angle θ2. When the first angle .theta.1 is the same as the second angle .theta.2, each of the first portion 47a and the second portion 49a can stably receive the main component force. The above configuration is effective when a large cutting load is likely to be applied not only to a portion of the first cutting edge 35a near the first end 3a of the holder 3 but also to a portion away from the first end 3a.

<Manufacturing method for cutting products>
Next, a method for manufacturing a machined product according to a non-limiting embodiment of the present disclosure will be described with reference to FIGS. 16 to 18. FIG. 16 to 18 show a method of manufacturing a cut product when cutting is performed using the rotary tool 1 described above. 16 to 18, the rotation axis of the rotary tool 1 is indicated by a chain double-dashed line. The cutting work 203 can be produced by cutting the work material 201 . A method for manufacturing a cut product may include the following steps.

i.e.
(1) a step of rotating the rotary tool 1 represented by the above embodiment;
(2) bringing the rotating rotary tool 1 into contact with the workpiece 201;
(3) separating the rotary tool 1 from the workpiece 201;
may be provided.

More specifically, first, as shown in FIG. 16, the rotary tool 1 may be relatively brought closer to the work material 201 while rotating in the X direction around the rotation axis O1. Next, as shown in FIG. 17 , the cutting edge of the rotary tool 1 may be brought into contact with the work material 201 to cut the work material 201 . Then, as shown in FIG. 18 , the rotary tool 1 may be relatively kept away from the work material 201 .

In the embodiment, the work material 201 may be fixed and the rotary tool 1 may be brought closer. 16 to 18, the work material 201 may be fixed and the rotary tool 1 may be rotated around the rotation axis O1. In addition, in FIG. 18, the work material 201 may be fixed and the rotary tool 1 may be kept away. In addition, in the above-described cutting process, the work material 201 is fixed and the rotary tool 1 is moved in each process, but it is of course not limited to such a form.

For example, in step (1), the work material 201 may be brought closer to the rotary tool 1 . Similarly, in the step (3), the work material 201 may be kept away from the rotary tool 1 . When cutting is to be continued, the process of bringing the cutting edge of the insert into contact with different portions of the workpiece 201 while maintaining the rotating state of the rotary tool 1 may be repeated.

Representative examples of the material of the work material 201 may include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.

1... rotary tool (milling tool)
3... Holder 3a... First end 3b... Second end O1... Rotation axis X... Rotation direction 5... Insert 7... Pocket 9... First insert 11... First pocket 13 Peripheral surface 15 First surface 17 Second surface 17a Flat part 19 First corner 21 First side 23 Second side 25... Second corner 27... Third corner 29... Third side 31... Third surface 33... Inner peripheral surface 35... Cutting edge 35a... First cutting edge 35b.・Second cutting edge 37 Rake face region 39 First flank region 41 Second flank region 43 Recess 45 Bottom 47 First region 47a First portion 49 Second region 49a Second portion L1 First imaginary line L2 Second imaginary line θ0 Angle 51 Through hole 53 Screw θ1・First angle θ2 Second angle 201 Work material 203 Cutting work

Claims (9)

a cylindrical holder extending from a first end to a second end along an axis of rotation and having a pocket located at the first end;
an insert located in the pocket ;
a screw that secures the insert to the holder ;
The insert is
which has a substantially triangular shape and is located on the outer peripheral side of the holder,
a first side;
an outer peripheral surface having a second side located behind the first side in the rotational direction of the rotating shaft;
an inner peripheral surface located on the opposite side of the outer peripheral surface and in contact with the pocket;
a first surface located between the outer peripheral surface and the inner peripheral surface and connected to the first side;
a second surface located between the outer peripheral surface and the inner peripheral surface and connected to the second side;
a cutting edge located on the first side ;
a through hole that is open on the outer peripheral surface and the inner peripheral surface and into which the screw is inserted ;
The outer peripheral surface is
a third side adjacent to the first side and the second side;
a first corner located between the first side and the second side;
a second corner located between the second side and the third side;
a third corner positioned between the first side and the third side;
The insert is
further comprising a third surface located between the outer peripheral surface and the inner peripheral surface and connected to the third side;
positioned in the pocket with the first corner positioned closer to the second end than the second corner and the third corner;
the second surface has a flat portion,
The pocket is
a screw hole into which the screw is inserted;
a recess located at a location facing the second surface and having a recessed shape when viewed from the side;
The recess is
a bottom;
a first region located forward of the bottom portion in the rotational direction and inclined with respect to the flat portion when viewed from the side;
a second region located behind the bottom portion in the rotational direction and inclined with respect to the flat portion when viewed from the side;
The first region has a first portion that contacts the second surface,
The second region has a second portion that abuts on the second surface,
the bottom is spaced apart from the second surface ;
The first part is located closer to the second end than the second part,
A rotary tool , wherein at least a portion of the first portion is positioned forward in the rotational direction of the central axis of the through hole . 2. The rotary tool according to claim 1, wherein, when viewed from the side, a first imaginary line extending said first area and a second imaginary line extending said second area intersect at an obtuse angle. The rotary tool according to claim 1 or 2 , wherein at least a portion of said second portion is located closer to said first end than the central axis of said through hole. A rotary tool according to any one of claims 1 to 3 , wherein said first region is flat. A rotary tool according to any one of claims 1 to 4 , wherein said second region is flat. The rotary tool according to any one of claims 1 to 5 , wherein the first corner and the second corner are separated from the recess when viewed from the side . The inclination angle of the first region with respect to the flat portion is a first angle, and the inclination angle of the second region with respect to the flat portion is a second angle,
A rotary tool according to any one of claims 1 to 6 , wherein said first angle is the same as said second angle. The inclination angle of the first region with respect to the flat portion is a first angle, and the inclination angle of the second region with respect to the flat portion is a second angle,
A rotary tool according to any one of claims 1 to 6 , wherein said second angle is greater than said first angle. A step of rotating the rotary tool according to any one of claims 1 to 8 ;
contacting the rotating rotary tool with a work material;
and a step of separating the rotary tool from the work material.

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