JP7055865B2 - Manufacturing method for rotary tools and cuttings - Google Patents

Description

Cross-reference of related applications

This application claims the priority of Japanese Patent Application No. 2018-116275 filed on June 19, 2018, and the entire disclosure of further applications is incorporated herein by reference.

This aspect relates to a method for manufacturing a rotary tool and a machined product.

When milling a work material, for example, a rotary tool (drill) described in International Publication No. 2016/047803 (Patent Document 1) is used. The drill described in Patent Document 1 has a tip surface (clearance surface), a chip discharge groove (discharge groove), a tip blade, a recess, and a coolant hole (flow path). The flank is located on the tip side of the drill body. The drain groove extends from the flank toward the rear end side of the drill body. The tip blade is located at the ridgeline where the flank and the discharge groove meet. The recess opens with respect to the flank and the drain groove. The flow path penetrates the drill body in the axial direction. The flow path in Patent Document 1 opens toward the tip of the drill body. Further, the portion (opening) where the flow path is opened is located in the flank or the recess.

The one-sided rotary tool in the present disclosure has a rod-shaped body extending along a rotation axis from the first end to the second end. The main body includes an outer peripheral surface, a cutting edge, a plurality of first surfaces, a plurality of discharge grooves, and a plurality of flow paths. The cutting edge is located at the first end. The first surface extends from the first end toward the second end and is located in front of the cutting edge in the rotation direction of the rotation axis. The drain groove extends from the cutting edge and the first surface toward the second end. The flow path is located inside the main body and extends from the side of the second end toward the first end. Further, at least one of the flow paths includes a first opening that opens on the first surface. A virtual extension region extending the flow path outward from the first opening intersects the cutting edge.

It is a perspective view which shows the one-sided rotary tool which is not limited in this disclosure. It is a side view of the rotary tool shown in FIG. It is a side view of the rotary tool shown in FIG. It is an enlarged view near the 1st end of the rotary tool shown in FIG. It is an enlarged view near the 1st end of the rotary tool shown in FIG. FIG. 3 is an enlarged view of the vicinity of the first end of the rotary tool shown in FIG. It is a front view which looked at the rotary tool shown in FIG. 1 toward the first end. It is a one-sided rotary tool without limitation in the present disclosure, and is an enlarged view corresponding to FIG. It is a one-sided rotary tool without limitation in the present disclosure, and is an enlarged view corresponding to FIG. It is a one-sided rotary tool without limitation in the present disclosure, and is an enlarged view corresponding to FIG. It is a figure which showed one step in the manufacturing method of the one-sided machined product which is not limited in this disclosure. It is a figure which showed one step in the manufacturing method of the one-sided machined product which is not limited in this disclosure. It is a figure which showed one step in the manufacturing method of the one-sided machined product which is not limited in this disclosure.

When the opening is located on the flank, the recess, or the like as in the drill described in Patent Document 1, the coolant flowing out from the opening tends to move away from the tip blade. Therefore, it is difficult to supply the coolant to the tip blade.

Hereinafter, a plurality of rotary tools of an embodiment without limitation will be described in detail with reference to the drawings. Specifically, as an example of a rotary tool, a drill will be described in detail with reference to drawings. In addition to the drill, examples of the rotary tool include an end mill and the like. Therefore, the drill described below may be replaced with a rotary tool such as an end mill.

In addition, each figure referred to below is shown in a simplified manner only for the main members in the members constituting each embodiment for convenience of explanation. Accordingly, the rotary tool may include any component not shown in each of the figures referenced herein. Further, the dimensions of the members in each drawing do not faithfully represent the dimensions of the actual constituent members and the dimensional ratio of each member.

The rotary tool 1 may have a rod-shaped body 3 extending along the rotation axis X from the first end 3a to the second end 3b, as in the non-limiting example shown in FIG. As shown in FIG. 1, the rod-shaped main body 3 may be rotatable in the direction of the arrow Y about the rotation axis X at the time of cutting the work material for manufacturing the work piece.

As in the non-limiting example shown in FIG. 1, the lower left end of the main body 3 may be the first end 3a and the upper right end may be the second end 3b. Further, as in the case of the unrestricted example in FIGS. 2 and 3, the upper end portion of the main body 3 is the first end 3a, and the lower end portion is the second end 3b. Generally, the first end 3a is also referred to as a tip and the second end 3b is also referred to as a rear end, and will be described below with reference to the tip 3a and the rear end 3b.

The outer diameter D of the main body 3 in the non-limiting embodiment can be set to, for example, 4 mm to 25 mm. Further, when the length in the direction along the rotation axis X is L, the relationship between L and D in the main body 3 can be set to, for example, L = 4D to 15D.

As in the non-limiting example shown in FIG. 1, the main body 3 may have a cutting portion 5 located on the side of the tip 3a and a shank portion 7 located on the rear end 3b side of the cutting portion 5. .. The cutting portion 5 includes a portion that comes into contact with the work material, and this portion plays a main role in the cutting process of the work material. The shank portion 7 is a portion gripped by a rotating spindle or the like in a machine tool, and is a portion designed according to the shape of the spindle. Examples of the shape of the shank portion 7 include a straight shank, a long shank, a long neck, and a tapered shank.

As in the non-limiting example shown in FIGS. 1 to 6, the main body 3 may have an outer peripheral surface 9, a cutting edge 11, and a plurality of discharge grooves 13. The outer peripheral surface 9 is a surface located on the outer periphery of the main body 3 having a rod shape, and may be located from the front end 3a to the rear end 3b of the main body 3. As in the non-limiting example shown in FIGS. 1 to 6, the distance from the rotation axis X to the outer peripheral surface 9 may be substantially constant.

The plurality of cutting edges 11 may be located at the tip 3a of the main body 3. Generally, the cutting blade 11 is called a tip blade, and therefore, in the following description, the cutting blade 11 will be described as the tip blade 11. As in the non-limiting example shown in FIG. 4, the main body 3 may have two tip blades 11a and 11b. The tip blade 11a and the tip blade 11b may be positioned from the rotation axis X toward the outer peripheral surface 9, respectively. The tip blade 11a and the tip blade 11b may be positioned so as to be 180 ° rotationally symmetric with respect to the rotation axis X.

The plurality of discharge grooves 13 may extend from the tip blade 11 toward the rear end 3b. The discharge groove 13 may extend linearly from the tip blade 11 toward the rear end 3b, or may extend by twisting. As in the unrestricted example shown in FIG. 1, the discharge groove 13 may be twisted and extended around the rotation axis X so as to be opposite to the rotation direction Y from the tip blade 11 toward the rear end 3b. .. When the main body 3 has the tip blade 11a and the tip blade 11b as in the case of the unrestricted example shown in FIG. 4, the main body 3 may have two discharge grooves 13.

Here, the term “twisted and extended” means that the discharge groove 13 is substantially twisted and extended from the tip blade 11 toward the rear end 3b. Therefore, the discharge groove 13 may have a partially untwisted portion. When the discharge groove 13 is twisted and extended, the twist angle of the discharge groove 13 is not limited to a specific value, but can be set to, for example, about 3 to 45 °.

Further, as in the case of the unrestricted example shown in FIGS. 4 and 5, the main body 3 further has a plurality of first surfaces 15 located in front of the rotation direction Y of the rotation axis X with respect to the tip blade 11. May be good. When the main body 3 has the tip blade 11a and the tip blade 11b as in the case of the unrestricted example shown in FIG. 4, the main body 3 may have two first surfaces 15.

The plurality of discharge grooves 13 may extend from the first surface 15 toward the rear end 3b in addition to the tip blade 11. That is, the discharge groove 13 may extend from the tip blade 11 and the first surface 15 toward the rear end 3b.

The first surface 15 may be located on the side of the tip 3a with respect to the discharge groove 13 as a whole, and the first surface 15 may be partially located on the side of the tip 3a with respect to the discharge groove 13. .. As in the unrestricted example shown in FIG. 2, the first surface 15 may extend from the side of the front end 3a toward the side of the rear end 3b.

As in the case of the unrestricted example shown in FIGS. 4 and 5, the main body 3 has a first surface 15 located in front of the rotation direction Y of the rotation axis X with respect to the tip blade 11, and the tip blade 11 and the first. It may be paraphrased to have a discharge groove 13 extending from the surface 15 toward the rear end 3b.

The main body 3 may further have a plurality of flow paths 17 located inside the main body 3. As in the non-limiting example shown in FIGS. 1 to 3, the main body 3 may have two flow paths 17. The flow path 17 may extend from the rear end 3b side toward the tip 3a. At least one of the plurality of flow paths 17 is a first flow path 19 extending from the rear end 3b side toward the tip 3a and a second flow path extending from the first flow path 19 toward the first surface 15. It may have a road 21 and.

The second flow path 21 may extend toward the tip 3a or may extend in a direction orthogonal to the rotation axis X. When the second flow path 21 extends from the first flow path 19 toward the tip 3a, there is little change in the flow direction of the coolant in the first flow path 19 and the second flow path 21. Therefore, the flow path loss of the coolant can be suppressed.

When the main body 3 has a plurality of flow paths 17, only one of the plurality of flow paths 17 may have a first flow path 19 and a second flow path 21. Further, when the main body 3 has a plurality of flow paths 17, each of the plurality of flow paths 17 may have a first flow path 19 and a second flow path 21.

The flow path 17 may be opened on the first surface 15. The portion of the flow path 17 that opens on the first surface 15 may be the first opening 23. That is, at least one of the flow paths 17 may include a first opening 23 that opens on the first surface 15. The plurality of flow paths 17 may each include a first opening 23. Further, when the flow path 17 has the first flow path 19 and the second flow path 21, the second flow path 21 may include the first opening 23.

When the second flow path 21 opens on the first surface 15 instead of the end surface on the side of the tip 3a in the main body 3, the coolant is likely to be supplied to the tip blade 11. Further, when the second flow path 21 is opened on the first surface 15 instead of the discharge groove 13 in the main body 3, the coolant is less likely to interfere with the flow of chips in the discharge groove 13.

The fluid flowing through the flow path 17 is generally called a coolant. Examples of the coolant include water-insoluble oils such as oil-based, inert extreme pressure type or active extreme pressure type, water-soluble oils such as emulsions, solutions or solutions, and compressed air. The coolant is appropriately selected and used according to the material of the work material.

The first flow path 19 may have an inlet for coolant. As in the non-limiting example shown in FIGS. 1 to 3, the inlet of the first flow path 19 may be located at the end face of the rear end 3b. The first flow path 19 may extend from the above-mentioned inflow port toward the tip 3a. The position of the inflow port of the first flow path 19 is not limited to the above-mentioned end face. The inflow port of the first flow path 19 may be located on the outer peripheral surface 9. The position of the inflow port in the first flow path 19 is not particularly limited, and the first flow path 19 may extend from the rear end 3b side toward the tip 3a side.

As in the non-limiting example shown in FIGS. 4 and 5, the second flow path 21 may be connected to the first flow path 19. In this case, the first flow path 19 may or may not have an opening through which the coolant is discharged.

As in the non-limiting example shown in FIGS. 4 and 5, the first flow path 19 may have a second opening 19a through which the coolant is discharged. The second opening 19a may be located on the end face on the side of the tip 3a so that the coolant is ejected in a direction away from the main body 3, as shown in FIGS. 4 and 5.

The end face on the side of the tip 3a may have a second face. That is, the main body 3 may have a second surface located at the tip 3a. The second opening 19a may be opened on the second surface. At this time, it may be said that the first flow path 19 has a second opening 19a that opens on the second surface.

The tip blade 11 may be located at the intersection of the second surface and the discharge groove 13. In this case, the second surface can function as a so-called flank. The first flank 35a, which will be described later, may correspond to the second surface.

The shapes of the first flow path 19 and the second flow path 21 are not particularly limited. For example, the first flow path 19 and the second flow path 21 may have a linear shape or a curved shape. Specifically, as in the non-limiting example shown in FIGS. 1 to 3, the first flow path 19 may have a spiral shape.

The cross sections of the first flow path 19 and the second flow path 21 orthogonal to the flow direction of the coolant may be circular, elliptical or polygonal, respectively. The first flow path 19 and the second flow path 21 may be set to, for example, an inner diameter of about 0.3 to 3 mm.

A region in which the flow path 17 is extended outward from the first opening 23, in other words, a region in which the opening region 25 of the first opening 23 is extended in the coolant ejection direction O1 is referred to as a virtual extension region 27. As shown in FIGS. 5 and 7, the virtual extension region 27 may intersect the tip blade 11. Here, the first opening 23 means the edge of the second flow path 21 that opens on the side opposite to the end connected to the first flow path 19. Further, the opening region 25 means a region surrounded by the first opening portion 23.

The coolant ejection direction O1 means a direction in which the central axis in the vicinity of the first opening 23 in the second flow path 21 is extended toward the outside of the main body 3. For example, when the opening region 25 of the first opening 23 is circular, the virtual extension region 27 has a substantially cylindrical shape along the ejection direction O1 with the opening region 25 as the bottom surface.

When the virtual extension region 27 intersects the tip blade 11, the coolant ejected from the second flow path 21 is likely to be supplied to the tip blade 11, and the tip blade 11 is likely to be efficiently cooled by the coolant. Therefore, the rotary tool 1 in the present disclosure has high durability.

As in the non-limiting example shown in FIG. 4, the main body 3 may further have a first flank surface 35a and a second flank surface 37a. The first flank 35a may be located behind the tip blade 11a in the rotation direction Y along the tip blade 11a. Further, the second flank 37a may be located behind the first flank 35a in the rotation direction Y along the first flank 35a.

Similarly, as in the unrestricted example shown in FIG. 4, the main body 3 may further have a first flank surface 35b and a second flank surface 37b. The first flank 35b may be located behind the tip blade 11b in the rotation direction Y along the tip blade 11b. Further, the second flank 37b may be located behind the first flank 35b in the rotation direction Y along the first flank 35b. The main body 3 may further have another flank located behind the second flank 37b in the rotation direction Y along the second flank 37b.

As in the unrestricted example shown in FIG. 4, the first surface 15 may be located closer to the rear end 3b than the second flank 37b.

An unrestricted example shown in FIG. 4 has two tip blades 11a, 11b, two first flanks 15a, 15b, two first flanks 35a, 35b, and two second flanks 37a, 37b. At this time, the first surface 15a located in front of the tip blade 11a in the rotation direction Y may be connected to the second flank 37b located behind the tip blade 11b in the rotation direction Y. Further, the first surface 15b located in front of the tip blade 11b in the rotation direction Y may be connected to the second flank 37a located in the rear of the rotation direction Y with respect to the tip blade 11a.

As in the non-limiting example shown in FIGS. 4 to 6, the tip blade 11 may have a chisel blade 29, one or more thinning blades 31, and one or more main cutting blades 33. The chisel blade 29 may intersect the axis of rotation X. The one or more thinning blades 31 may extend from the chisel blade 29 toward the outer peripheral surface 9. The one or more main cutting blades 33 may extend from the thinning blade 31 toward the outer peripheral surface 9.

As in the non-limiting example shown in FIGS. 4 to 6, the tip blade 11 may have one chisel blade 29, two thinning blades 31, and two main cutting blades 33. At this time, the tip blade 11a is composed of a part of the chisel blade 29, a thinning blade 31a which is one of the two thinning blades 31, and a main cutting blade 33a which is one of the two main cutting blades 33. May be done. Further, the tip blade 11b is composed of the rest of the chisel blade 29, the thinning blade 31b which is the other of the two thinning blades 31, and the main cutting blade 33b which is the other of the two main cutting blades 33. May be done.

When the main body 3 is viewed toward the tip 3a, the thinning blade 31 may be inclined with respect to the adjacent chisel blade 29 and the main cutting blade 33, respectively. At this time, as shown in FIG. 7, the intersecting angle of the thinning blade 31 and the chisel blade 29 may be an obtuse angle. Further, the angle at which the thinning blade 31 and the main cutting blade 33 intersect may be an obtuse angle. When the above two angles are obtuse, the tip blade 11 has high durability.

Here, "when viewed toward the tip 3a" means a case where the tip 3a is viewed from the front along the rotation axis X. "When viewed toward the tip 3a" may be rephrased as "when viewed at the tip".

As in the non-limiting example shown in FIGS. 5 and 7, the virtual extension region 27 may intersect the thinning blade 31. In the example shown in FIG. 5, the portion where the coolant ejected from the first opening 23 hits is represented by diagonal lines.

As shown in FIGS. 5 and 7, when the rotary tool 1 has the above configuration, the coolant ejected from the second flow path 21 is likely to be directly supplied to the thinning blade 31, and the thinning blade 31 is easily supplied. It is easy to be cooled efficiently by the coolant. Therefore, the rotary tool 1 in the unrestricted example shown in FIGS. 5 and 7 has a high durability because the cutting edge temperature does not easily rise.

Further, as in the non-limiting example shown in FIGS. 5 and 7, and the non-limiting example shown in FIGS. 8 to 10, the virtual extension region 27 may intersect the main cutting edge 33. In the example shown in FIG. 8 and the like, the portion where the coolant ejected from the first opening 23 hits is represented by diagonal lines.

The main cutting blade 33, which is farther from the rotation axis X than the thinning blade 31, has a rotation speed higher than that of the thinning blade 31. Therefore, the main cutting edge 33 has a large amount of cutting and wear is likely to proceed. When the rotary tool 1 has the above configuration as in the case of the unrestricted example shown in FIG. 5, the coolant ejected from the second flow path 21 is likely to be directly supplied to the main cutting edge 33, and the main cutting edge 33 is easily supplied by the coolant. It is easy to be cooled efficiently. Therefore, the rotary tool 1 in the non-limiting example shown in FIG. 5 is less likely to be worn and has high durability.

As in the non-limiting example shown in FIGS. 5 and 7, the virtual extension region 27 may intersect the thinning blade 31 and the main cutting blade 33. When the main body 3 is viewed toward the tip 3a and the thinning blades 31 are inclined with respect to the adjacent main cutting blades 33, a large load is likely to be applied to the boundary between the thinning blades 31 and the main cutting blades 33.

Here, when the virtual extension region 27 intersects the thinning blade 31 and the main cutting blade 33, not only the coolant hits each of the thinning blade 31 and the main cutting blade 33, but also the coolant is stable at the above-mentioned boundary. And hit. Therefore, the durability of the tip blade 11 is high.

Further, when viewed toward the tip 3a as in the non-limiting example shown in FIGS. 7, 9 and 10, the virtual extension region 27 is in the rotation direction Y of the rotation axis X as the distance from the first opening 23 increases. It may extend backward.

When the virtual extension region 27 has the above configuration, the coolant injected from the first opening 23 is likely to be supplied to the tip blade 11. When the rotary tool 1 has the above configuration as in the non-limiting example shown in FIGS. 7 and 9, the tip blade 11 can be cooled more efficiently.

Further, as in the non-limiting example shown in FIG. 7 and the non-limiting example shown in FIG. 9, the portion where the virtual extension region 27 and the tip blade 11 intersect when viewed toward the tip 3a is the first opening 23. It may be located closer to the axis of rotation X. In other words, the distance between the portion where the virtual extension region 27 and the tip blade 11 intersect and the rotation axis X may be smaller than the distance between the first opening 23 and the rotation axis X.

When the main body 3 has the above configuration, the coolant injected from the first opening 23 of the second flow path 21 is likely to be sprayed over a wide range of the tip blade 11. Therefore, the tip blade 11 can be efficiently cooled.

On the other hand, as in the case of the unrestricted example shown in FIG. 10, when viewed toward the tip 3a, the portion where the virtual extension region 27 and the tip blade 11 intersect may be separated from the rotation axis X from the first opening 23. good. In other words, the distance between the portion where the virtual extension region 27 and the tip blade 11 intersect and the rotation axis X may be larger than the distance between the first opening 23 and the rotation axis X.

When the main body 3 has the above configuration, the chips generated by the tip blade 11 are moved from the side of the rotary shaft X to the side of the outer peripheral surface 9 having a wide chip discharge space by the coolant injected from the first opening 23. Easy to flow. Therefore, the rotary tool 1 in the unrestricted example shown in FIG. 10 is less likely to be clogged with chips and has good chip discharge.

When the tip blade 11 has the thinning blade 31 as in the non-limiting example shown in FIGS. 4 to 6, even if the main body 3 has a so-called gash surface located between the thinning blade 31 and the discharge groove 13. good. As in the non-limiting example shown in FIGS. 4 to 6, the gash surface may be composed of two adjacent flat surfaces in the rotation direction Y.

At this time, the surface of the gash surface located behind the rotation direction Y may be connected to the thinning blade 31. Further, the surface of the gash surface located in front of the rotation direction Y may be the first surface 15. In this case, it can be said that the second flow path 21 opens on the surface of the gash surface located in front of the rotation direction Y.

The second flow path 21 may have a linear shape or a curved shape. For example, as shown in FIGS. 5 and 8, the second flow path 21 may have a linear first portion 21a and a linear second portion 21b. The first portion 21a may be connected to the first flow path 19 and may be tilted with respect to the rotation axis X1 at a first tilt angle θ1. The second portion 21b may include a first opening 23 and may be tilted with respect to the rotation axis X1 at a second tilt angle θ2.

At this time, the first inclination angle θ1 may be smaller than the second inclination angle θ2. When the first inclination angle θ1 which is the inclination angle of the first portion 21a connected to the first flow path 19 is relatively small, when the coolant flows from the first flow path 19 to the second flow path 21. Flow path loss is suppressed. Further, when the second inclination angle θ2, which is the inclination angle of the second portion 21b provided with the first opening 23, is relatively large, it is easy to apply the coolant to a wide range of the tip blade 11.

Examples of the material of the main body 3 include cemented carbide and cermet. Examples of the composition of the cemented carbide include WC-Co, WC-TiC-Co and WC-TiC-TaC-Co. Here, WC, TiC, and TaC are hard particles, and Co is a bonded phase. Cermet is a sintered composite material in which a metal is composited with a ceramic component. Specifically, examples of the cermet include a titanium compound containing titanium carbide (TiC) or titanium nitride (TiN) as a main component.

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

<Manufacturing method of machined material>
Next, a method for manufacturing a machined product according to an embodiment not limited to the present disclosure will be described in detail with reference to the case where the rotary tool 1 of the above embodiment is used as an example. Hereinafter, description will be made with reference to FIGS. 11 to 13.

The method for manufacturing a work piece according to an embodiment not limited to the present disclosure is a method.
(1) The process of rotating the rotary tool 1 around the rotation axis X,
(2) A process of bringing the cutting edge of the rotating rotary tool 1 into contact with the work material 100, and
(3) A process of separating the rotary tool 1 from the work material 100,
To prepare for.

More specifically, first, as shown in FIG. 11, by rotating the rotary tool 1 around the rotary shaft X and moving it in the Z1 direction along the rotary shaft X, the rotary tool 1 is moved to the work material 100. Relatively close to.

Next, as shown in FIG. 12, the cutting edge of the rotary tool 1 is brought into contact with the work material 100 to cut the work material 100. Then, as shown in FIG. 13, by moving the rotary tool 1 in the Z2 direction, the rotary tool 1 is relatively far from the work material 100.

With the work material 100 fixed and the rotary tool 1 rotated around the rotary shaft X, the rotary tool 1 is brought closer to the work material 100. Further, as shown in FIG. 12, the work material 100 is cut by bringing the cutting edge of the rotating rotary tool 1 into contact with the work material 100. Further, as shown in FIG. 13, the rotary tool 1 is moved away from the work material 100 in a rotated state.

In the cutting process using the manufacturing method according to the embodiment not limited to the present disclosure, in each step, the rotary tool 1 is moved to bring the rotary tool 1 into contact with the work material 100, or the rotary tool 1 is used. Separate from the work material 100. Of course, it is not limited to such a form.

For example, in the step (1), the work material 100 may be brought closer to the rotary tool 1. Similarly, in the step (3), the work material 100 may be moved away from the rotary tool 1. When the cutting process is continued, the process of keeping the rotary tool 1 rotated and bringing the cutting edge of the rotary tool 1 into contact with different parts of the work material 100 may be repeated.

Typical examples of the material of the work material 100 include aluminum, carbon steel, alloy steel, stainless steel, cast iron, non-ferrous metal and the like.

1 ... Rotating tool 3 ... Main body 3a ... First end (tip)
3b ... 2nd end (rear end)
5 ... Cutting part 7 ... Shank part 9 ... Outer peripheral surface 11 ... Cutting blade (tip blade)
13 ... Discharge groove 15 ... First surface 17 ... Flow path 19 ... First flow path 21 ... Second flow path 21a ... First part 21b ... Second part 23 ...・ Opening 25 ・ ・ ・ Opening area 27 ・ ・ ・ Virtual extension area 29 ・ ・ ・ Chisel blade 31 ・ ・ ・ Thinning blade 33 ・ ・ ・ Main cutting blade 35 ・ ・ ・ 1st flank surface 37 ・ ・ ・ 2nd flank Surface 100 ... Work material O1 ... Injection direction Q1 ... Central axis of the second flow path X ... Rotation axis Y ... Rotation direction Z ... Cutting direction θ1 ... First inclination Angle θ2 ・ ・ ・ Second tilt angle

Claims (10)

It has a rod-shaped body that extends along the axis of rotation from the first end to the second end.
The main body is
The outer peripheral surface and
The cutting edge located at the first end and
A plurality of first surfaces extending from the first end toward the second end and located in front of the cutting edge in the rotation direction of the rotation axis.
A plurality of discharge grooves extending from the cutting edge and the first surface toward the second end,
It is provided with a plurality of flow paths located inside the main body and extending from the side of the second end toward the first end.
At least one of the flow paths comprises a first opening that opens on the first surface.
A virtual extension region extending the flow path from the first opening to the outside intersects with the cutting edge.
The flow path is
A first flow path extending from the side of the second end toward the first end,
It has a second flow path extending from the first flow path toward the first surface and having the first opening.
The first surface is a gash surface,
The second flow path is a rotary tool located on the side of the first end of the first surface with respect to the end located on the side of the second end on the first surface when viewed from the side surface . The body further has a second surface located at the first end.
The cutting edge is located at the intersection of the second surface and the discharge groove.
The rotary tool according to claim 1 , wherein the first flow path has a second opening that opens on the second surface. It has a rod-shaped body that extends along the axis of rotation from the first end to the second end.
The main body is
The outer peripheral surface and
The cutting edge located at the first end and
A plurality of first surfaces extending from the first end toward the second end and located in front of the cutting edge in the rotation direction of the rotation axis.
A plurality of discharge grooves extending from the cutting edge and the first surface toward the second end,
It is provided with a plurality of flow paths located inside the main body and extending from the side of the second end toward the first end.
At least one of the flow paths comprises a first opening that opens on the first surface.
A virtual extension region extending the flow path from the first opening to the outside intersects with the cutting edge.
The body further has a second surface located at the first end.
The cutting edge is located at the intersection of the second surface and the discharge groove.
The flow path is
A first flow path extending from the side of the second end toward the first end,
It has a second flow path extending from the first flow path toward the first surface and having the first opening.
The first flow path has a second opening that opens on the second surface.
The second flow path is
A linear first portion connected to the first flow path and inclined at the first inclination angle with respect to the rotation axis.
It has the first opening and has a linear second portion inclined at a second tilt angle with respect to the rotation axis.
A rotary tool whose first tilt angle is smaller than the second tilt angle . The cutting edge is
A chisel blade that intersects the axis of rotation,
A plurality of thinning blades extending from the chisel blade toward the outer peripheral surface,
It has a plurality of main cutting blades extending from the thinning blade toward the outer peripheral surface.
The rotary tool according to any one of claims 1 to 3, wherein the virtual extension region intersects with at least one of the thinning blade and the main cutting blade. The rotary tool according to claim 4, wherein the virtual extension region intersects the thinning blade and the main cutting blade. One of claims 1 to 5, when viewed toward the first end, the virtual extension region extends rearward in the rotational direction of the rotation axis as it moves away from the first opening. The rotary tool described in. When viewed toward the first end, the portion where the virtual extension region and the cutting edge intersect is any one of claims 1 to 6, which is farther from the rotation axis than the first opening. The rotary tool described in. The first surface has a flat portion and has a flat portion.
The rotary tool according to any one of claims 1 to 7, wherein the second flow path opens in the flat portion. The rotary tool according to any one of claims 1 to 8, wherein the second flow path extends from the first flow path toward the first end. The step of rotating the rotary tool according to any one of claims 1 to 9 ,
The process of bringing the rotating tool into contact with the work material,
A method for manufacturing a machined product, comprising a step of separating the rotary tool from the work material.

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