JP2023114255A - Rotary tool and manufacturing method of cutting workpiece - Google Patents

Abstract

To provide a rotary tool which can supply a coolant to a cutting blade without fail.SOLUTION: A rotary tool based on one aspect of the disclosure has a rod-like body extending along a rotation axis O1. The body has a first member 5, a second member 7, and a cylindrical third member 9 into which the second member is inserted. The first member 5 has a first outer surface, a frist groove, and a cutting blade. The second member 7 has a second outer surface, a second groove 29, a first passage 35, and a second passage 37. The second passage has a first outlet 39 which is open in the second groove 29. The third member 9 is located so as to enclose the first outlet 39 and the cutting blade is away from the rotary shaft farther than an inner peripheral surface of the third member 9.SELECTED DRAWING: Figure 8

Description

The present disclosure relates to rotary tools and methods of manufacturing cut workpieces.

As a rotary tool, for example, a rotary tool described in Patent Document 1 is known. In the rotary tool disclosed in Patent Document 1, a tool body is provided with a coolant hole, and the coolant hole opens toward the tip side of the tool where the cutting edge is located. As a result, coolant can be supplied near the cutting edge during cutting.

JP 2012-061594 A

In the rotary tool disclosed in Patent Document 1, coolant is discharged from the side surface of the holder toward the cutting edge. Here, since the holder rotates at high speed during cutting, there is a risk that the coolant will diverge and the coolant cannot be reliably supplied to the cutting edge.

The present disclosure has been made in view of the above problems, and an object thereof is to provide a rotary tool capable of reliably supplying coolant to a cutting edge.

A rotary tool according to one aspect of the present disclosure has a rod-shaped body extending from a first end toward a second end along an axis of rotation. The body includes a first member located on the first end side, a second member located on the second end side of the first member, and a cylindrical body into which the second member is inserted. and a third member. The first member has a first outer surface, a first groove extending from the first end toward the second end on the first outer surface, and a rotation shaft for the first groove. a cutting edge located rearward in the rotational direction and extending along the first groove. The second member includes a second outer surface, a second groove extending from the first end side toward the second end on the second outer surface and connected to the first groove, It has a first flow path located inside the main body and extending along the rotation axis, and a second flow path extending from the first flow path to the second groove. The second flow path has a first outlet opening into the second groove. The third member is positioned so as to surround the first outlet, and the cutting edge is further away from the rotating shaft than the inner peripheral surface of the third member.

In the rotary tool described above, the coolant can be stably supplied to the cutting edge.

1 is a perspective view showing a rotary tool according to one embodiment; FIG. It is the top view which looked at the rotary tool shown in FIG. 1 from A1 direction. It is the top view which looked at the rotary tool shown in FIG. 1 from A2 direction. 2 is an enlarged view of the rotating tool shown in FIG. 1 with a third member removed; FIG. 4 is an enlarged view of region B shown in FIG. 3; FIG. FIG. 6 is a cross-sectional view of the VI-VI cross section shown in FIG. 5; FIG. 6 is a cross-sectional view of the VII-VII cross section shown in FIG. 5; FIG. 3 is a cross-sectional view of the VIII-VIII cross section shown in FIG. 2; FIG. 4 is a perspective view showing a third member in the rotary tool according to one embodiment; It is the top view which looked at the 3rd member shown in FIG. 9 from A3 direction. 4 is an enlarged perspective view of the rotary tool shown in FIG. 3; FIG. It is a schematic explanatory drawing which shows 1 process of the manufacturing method of the cut workpiece which concerns on one Embodiment. It is a schematic explanatory drawing which shows 1 process of the manufacturing method of the cut workpiece which concerns on one Embodiment. It is a schematic explanatory drawing which shows 1 process of the manufacturing method of the cut workpiece which concerns on one Embodiment.

A rotary tool 1 according to an embodiment of the present disclosure will be described in detail below with reference to the drawings. However, for convenience of explanation, each drawing to be referred to below shows only the main members necessary for explaining the present invention among the constituent members of the embodiment in a simplified manner. Accordingly, the rotary tool 1 of the present invention may comprise optional components not shown in the figures to which this specification refers. 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.

A rotary tool 1 according to an embodiment of the present disclosure is a reamer. In addition to the reamer, examples of the rotating tool 1 include an end mill and a drill. Accordingly, rotary tools 1 such as drills and end mills may be substituted for the rotary tools 1 described below.

As in the example shown in FIG. 1, the rotary tool 1 has a rod-shaped body 3 extending from a first end 3A toward a second end 3B along a rotation axis O1. The bar-shaped main body 3 is rotatable in a rotation direction O2 about a rotation axis O1 as shown in FIG. Note that the rotation axis O1 is an axis along which the rotary tool 1 rotates, and is not provided as a tangible object in the rotary tool 1 .

As in the example shown in FIG. 1, the lower end of the main body 3 is the first end 3A and the upper end is the second end 3B. Generally, the first end 3A is also called the leading end 3A and the second end 3B is called the trailing end 3B. In the following, the leading end 3A and the trailing end 3B are used. FIG. 2 is a plan view of the rotary tool 1 viewed from the tip 3A side along the rotation axis O1, and may be called a front view or a tip view. FIG. 3 is a plan view of the rotary tool 1 viewed from a direction perpendicular to the rotation axis O1, which may be called a side view.

The outer diameter of the main body 3 can be set to 10 mm to 50 mm, for example. Further, when the length in the direction along the rotation axis O1 is L and the outer diameter is D, the relationship between L and D can be set to L=5D to 30D, for example, in the main body 3 of the embodiment.

In the example shown in FIG. 1, the main body 3 has a cylindrical shape with a first member 5 located on the side of the front end 3A, a second member 7 located on the side of the rear end 3B rather than the first member 5, It has a third member 9 into which the second member 7 is inserted. In the main body 3 according to the embodiment, the third member 9 is a separate member from the first member 5 and the second member 7. For example, when the main body 3 is manufactured by a manufacturing method using a 3D printer, It may be integrated with the second member 7 . 1 to 3, the first member 5 and the second member 7 are substantially cylindrical, and the third member 9 is substantially cylindrical.

The first member 5 has a first outer surface 11 . In the example shown in FIG. 4, the first outer surface 1
Reference numeral 1 denotes a side surface of a first member 5 having a substantially cylindrical shape. Further, the main body 3 has a distal end surface 13 located on the distal end 3A side. The shape of the tip surface 13 is not particularly limited, and in the example shown in FIG. 4, it has a substantially planar shape.

The first outer surface 11 may have an inclined surface 15 located on the side of the tip 3A. The inclined surface 15 may be connected to the distal end surface 13, and may extend in a direction away from the rotation axis O1 from the distal end 3A side toward the rear end 3B side. As shown in FIG. 4 , the first outer surface 11 may have a plurality of slanted surfaces 15 . The shape of the inclined surface 15 is not particularly limited, and may be curved, for example. In addition, in the example shown in FIG. 4, the inclined surface 15 has a planar shape.

The first outer surface 11 may have a first outer peripheral surface 17 . The first outer peripheral surface 17 in the example shown in FIG. The first outer peripheral surface 17 may have a surface configuration with a constant distance from the rotation axis O1. In this case, the first outer peripheral surface 17 may be located on the circumscribed circle of the first member 5 in the cross section perpendicular to the rotation axis O1. In the example shown in FIG. 4, the first outer peripheral surface 17 is composed of a plurality of surface regions positioned apart from each other.

As described above, the first outer peripheral surface 17 may have a surface configuration in which the distance from the rotation axis O1 is constant, and may be arranged such that it approaches the rotation axis O1 as it goes from the front end 3A side to the rear end 3B side. can be tilted to When the first outer peripheral surface 17 is located on the circumscribed circle of the first member 5 in the cross section perpendicular to the rotation axis O1, the first outer peripheral surface 17 has a curved shape. However, the first outer peripheral surface 17 is not limited to such a shape. For example, when the first outer peripheral surface 17 is configured by a plurality of surface regions positioned apart from each other, each surface region may have a planar shape. That is, the first member 5 may have a polygonal prism shape.

The first member 5 has a plurality of first grooves 19 extending from the front end 3A side toward the rear end 3B side on the first outer surface 11 . The number of first grooves 19 is not particularly limited. In the example shown in FIG. 2, the first grooves 19 are open at the distal end 3A of the first member 5, and the first grooves 19 are separated from each other with the first outer peripheral surface 17 therebetween.

The first member 5 has a cutting edge 21 positioned behind the first groove 19 in the rotation direction O2 of the rotation axis O1 and extending along the first groove 19 . The cutting edge 21 in the example shown in FIG. 5 is positioned at the intersection of the first groove 19 and the inclined surface 15 adjacent to the first groove 19 rearward in the rotational direction O2. In one example shown in FIG. 5 , the first member 5 has a plurality of cutting edges 21 corresponding in number to the plurality of first grooves 19 . The cutting edge 21 may extend from the front end 3A side to the rear end 3B side, as shown in FIG. The first member 5 is generally called a cutting portion because it has a cutting edge 21 .

Since the cutting edge 21 extends along the first groove 19 , in the case where the first outer surface 11 has the first outer peripheral surface 17 , the cutting edge 21 extends only at the intersection of the first groove 19 and the inclined surface 15 . Instead, for example, it may also be located at the intersection of the first groove 19 and the first outer peripheral surface 17 .

As shown in FIG. 5, the cutting edge 21 may have a first cutting edge 23 located on the side of the front end 3A and a second cutting edge 25 located on the side of the rear end 3B relative to the first cutting edge 23. good. In this case, the first cutting edge 23 is positioned at the intersection of the first groove 19 and the inclined surface 15 . The second cutting edge 25 is positioned at the intersection of the first groove 19 and the first outer peripheral surface 17 . The second cutting edge 25 may be connected to the first cutting edge 23 or may be separated from the first cutting edge 23 . The first cutting edge 23 may extend in a direction away from the rotation axis O1 from the front end 3A side toward the rear end 3B side.

The second cutting edge 25 may extend in a direction approaching the rotation axis O1 from the front end 3A side toward the rear end 3B side. The second cutting edge 25 may be positioned along the first outer peripheral surface 17 . The end of the first cutting edge 23 on the rear end 3B side and the end of the second cutting edge 25 on the front end 3A side may be connected.

The second member 7 has a second outer surface 27 . In the example shown in FIG. 4, the second outer side surface 27 is the side surface of the second member 7 which is substantially cylindrical. The second outer surface 27 may have a second outer peripheral surface 28 . The second outer peripheral surface 28 may have a surface configuration with a constant distance from the rotation axis O1. In this case, the second outer peripheral surface 28 may be located on the circumscribed circle of the second member 7 in the cross section perpendicular to the rotation axis O1. In the example shown in FIG. 4, the second outer peripheral surface 28 is composed of a plurality of surface regions positioned apart from each other.

In the example shown in FIG. 4, the second member 7 has a plurality of second grooves 29 extending from the front end 3A side toward the rear end 3B side on the second outer surface 27 . The number of second grooves 29 is not particularly limited. In the example shown in FIG. 4, the second groove 29 is connected to the first groove 19 on the tip 3A side of the second member 7 . The plurality of second grooves 29 may be separated from each other via the second outer peripheral surface 28 .

The second member 7 has a shank portion 31 located closer to the rear end 3B than the second groove 29 in the example shown in FIG. The shank portion 31 is a portion that is gripped by a rotating spindle or the like in a machine tool, and may be designed according to the shape of the spindle. Examples of the shape of the shank portion 31 include straight shank, long shank, long neck, and tapered shank.

The first member 5 and the second member 7 may be separate members. In this case, as shown in FIG. 4, the first member 5 may be attached to the second member 7 by inserting a fixture 33 from the tip 3A side of the main body 3 . Moreover, as shown in FIG.

As shown in FIGS. 6 and 7, in a cross section orthogonal to the rotation axis O1, the maximum value of the diameter D1 of the portion of the first member 5 having the cutting edge 21 is the portion of the second member 7 having the second groove 29. may be larger than the maximum value of the diameter D2. In such a case, since the diameter of the portion of the second member 7 located on the side of the tip 3A of the second member 7 is smaller than the working diameter of the tool, it is possible to insert the main body 3 deeper into the machined hole during cutting. As a result, the workable range in the direction along the rotation axis O1 is widened.

6 is a cross-sectional view of the main body 3 cut along the line VI-VI in FIG. A VI-VI cross section is a cross section that passes through the point of contact P of the first cutting edge 23 and the second cutting edge 25 and is orthogonal to the rotation axis O1. FIG. 7 is a cross-sectional view of the main body 3 taken along line VII--VII in FIG. The VII-VII cross section is a cross section including the second groove 29 and orthogonal to the rotation axis O1.

The second member 7 has a first flow path 35 extending along the rotation axis O1. As shown in FIG. 8, the first flow path 35 is located inside the main body 3 and extends from the front end 3A side to the rear end 3B side. Also, in the example shown in FIG. 8 , the first flow path 35 passes through the center of the main body 3 . The shape of the first flow path 35 is not particularly limited, and may be linear as shown in FIG. 8 is a cross-sectional view of the main body 3 cut along line VIII-VIII in FIG. The VIII-VIII cross section is a cross section passing through the center of the third member 9 and parallel to the rotation axis O1.

The second member 7 has one or more second flow paths 37 extending from the first flow paths 35 to the second grooves 29 . As shown in FIG. 8, the second member 7 may have a plurality of second flow paths 37, and in a cross section including the rotation axis O1 and the second flow paths 37, each second flow path 37 It may extend from the first channel 35 toward the second groove 29 .

In the example shown in FIG. 8, the second flow path 37 extends toward the distal end 3A side and the outer peripheral side. The shape of the second flow path 37 is not particularly limited, and may be linear as shown in FIG. Moreover, when the main body 3 is seen through from the tip thereof, the plurality of second flow paths 37 may extend radially from the center of the main body 3 .

The second flow path 37 has a first outlet 39 opening into the second groove 29 . The first outlet 39 is provided to discharge the coolant that has passed through the first flow path 35 and the second flow path 37 into the second groove 29 . As shown in FIG. 8, the first outflow port 39 is located on the side of the tip 3A of the second flow path 37 and on the outer peripheral side. The first outflow port 39 may open on the rear end 3B side of the second groove 29, or may open on the front end 3A side of the second groove 29, as shown in FIG.

The third member 9 has an inner peripheral surface 41 and an outer peripheral surface 43 . The diameters of the inner peripheral surface 41 and the outer peripheral surface 43 may be constant. Since the second member 7 is inserted into the third member 9, as shown in FIG. equal to or greater than the diameter of the portion of 7 located on the side of tip 3A.

The third member 9 is positioned to surround the first outlet 39, as shown in FIG. Note that FIG. 11 is an enlarged view of the main body 3 shown in FIG. 3 and is a perspective view of the second member 7 . Here, the fact that the third member 9 is positioned so as to surround the first outlet 39 means that when the main body 3 is viewed from the side, the first outlet 39 as a whole overlaps with the third member 9, so that the first flow It refers to a state in which the exit 39 cannot be visually observed. If the above state cannot be determined from a side view, the cross section including the first outflow port 39 and orthogonal to the rotation axis O1 may be evaluated. In this cross section, it is determined that the third member 9 is positioned so as to surround the first outlet 39 when the third member 9 is positioned on the imaginary straight line connecting the rotation axis O1 and the first outlet 39. you can

The cutting edge 21 is further away from the rotation axis O<b>1 than the inner peripheral surface 41 of the third member 9 . Specifically, in a cross section orthogonal to the rotation axis O1 shown in FIG. 6 and a front view from the direction along the rotation O1 shown in FIG. It is larger than the interval W2 from O1 to the inner peripheral surface 41.

Here, the maximum value of the distance from the rotation axis O1 to the cutting edge 21 may be the distance from the rotation axis O1 to the cutting edge 21, and the distance from the rotation axis O1 to the portion of the inner peripheral surface 41 on the tip 3A side may be The distance from the rotation axis O1 to the inner peripheral surface 41 may be set. 10 is a view of the third member 9 viewed from the tip 3A side along the rotation axis O1. Further, as shown in FIGS. 9 and 10, the center axis C1 of the third member 9 may be replaced with the rotation axis O1 of the main body 3.

In the example shown in FIGS. 6 and 10, the distance W1 from the rotation axis O1 to the point of contact P of the first cutting edge 23 and the second cutting edge 25 is the portion on the tip 3A side of the inner peripheral surface 41 from the rotation axis O1. is larger than the interval W2 to In addition, if the diameter of the inner peripheral surface 41 is not constant or the cross section of the inner peripheral surface 41 is not circular, the cross section including the first outlet 39 and perpendicular to the rotation axis O1 has a rotation axis The distances may be compared on an imaginary straight line passing through O1 and the first outflow port 39 .

In general, from the viewpoint of ensuring the thickness of the tip 3A portion of the tool body where cutting load is likely to be applied, a flow path passing through the inside of the body 3 and an outflow port for discharging coolant are provided on the rear end 3B side of the body 3. is desired. In such a case, while the wall thickness on the side of the tip 3A is ensured, the distance between the first outflow port 39 and the cutting edge 21 increases.

In the rotary tool 1 according to this embodiment, during cutting, the coolant passes through the first flow path 35 and the second flow path 37 and is discharged from the first outlet 39 toward the tip 3A of the main body 3. . Here, since the third member 9 surrounds the first outlet 39, even if the distance between the first outlet 39 and the cutting edge 21 is large, the coolant discharged from the first outlet 39 is It collides with the inner peripheral surface 41 of the third member 9 and tends to flow along the second groove 29 and the first groove 19 toward the tip 3A. As a result, the coolant can be stably supplied to the cutting edge 21 located on the side of the tip 3A, and the durability of the cutting edge 21 is enhanced.

Further, during cutting, the tool body rotates at high speed. Therefore, when the first outflow port 39 is simply opened on the outer surface of the main body 3 as in the case where the third member 9 is not provided, centrifugal force is applied to the coolant. Coolant tends to scatter in a direction away from the rotation axis O1. As a result, there is a possibility that the coolant cannot be well supplied to the cutting edge 21 located on the side of the tip 3A.

However, in the rotary tool 1 according to this embodiment, the cutting edge 21 is farther from the rotation axis O1 than the inner peripheral surface 41 of the third member 9 is. Therefore, even when centrifugal force is applied to the coolant in a direction away from the main body 3, the coolant can be supplied to the cutting edge 21 in a more stable manner.

The cutting edge 21 may be further away from the rotation axis O<b>1 than the outer peripheral surface 43 of the third member 9 . Specifically, in the cross section orthogonal to the rotation axis O1 shown in FIG. 6 and the front view from the direction along the rotation axis O1 shown in FIG. It may be larger than the interval W3 from O1 to the outer peripheral surface 43 . Here, the maximum value of the distance from the rotation axis O1 to the cutting edge 21 may be the distance from the rotation axis O1 to the cutting edge 21, and the distance from the rotation axis O1 to the portion of the outer peripheral surface 43 on the tip 3A side may be rotated. The distance from the axis O1 to the outer peripheral surface 43 may be set.

In the example shown in FIGS. 6 and 10, the distance W1 from the rotation axis O1 to the point of contact P of the first cutting edge 23 and the second cutting edge 25 is from the rotation axis O1 to the portion of the outer peripheral surface 43 on the tip 3A side. interval W3. In addition, when the diameter of the outer peripheral surface 43 is not constant, or when the cross-sectional view of the outer peripheral surface 43 is not circular, the cross section including the tip 3A side of the third member 9 and perpendicular to the rotation axis O1 The intervals may be compared.

In such a case, since the machining diameter of the tool becomes larger than the outer diameter of the third member 9, it becomes possible to insert the main body 3 into the machining hole up to the position of the third member 9 during cutting. The workable range in the direction along the rotation axis O1 is widened.

The third member 9 may be located closer to the rear end 3B than the first member 5, as shown in FIG. Also, a part of the second groove 29 on the side of the tip 3A may be opened to the outer peripheral side. The fact that a portion of the second groove 29 on the side of the tip 3A is open to the outer peripheral side refers to a state in which the second groove 29 is visible when the main body 3 is viewed from the side. If the above state cannot be determined from a side view, the evaluation may be made on a cross section that includes the portion of the second groove 29 on the side of the tip 3A and that is perpendicular to the rotation axis O1. In this cross section, if the third member 9 is not positioned on the imaginary straight line connecting the rotation axis O1 and the first outlet 39, a portion of the second groove 29 on the side of the tip 3A is open to the outer peripheral side. You can judge.

In the above case, it is possible to avoid the risk of chips generated during cutting entering between the second member 7 and the third member 9 and damaging the main body 3 .

The second flow path 37 may extend in the direction toward the tip 3A as it separates from the first flow path 35 . Also, the central axis C2 of the second flow path 37 may intersect the third member 9 . Specifically, as shown in FIG. 8, the imaginary extension line N obtained by extending the central axis C2 of the second flow path 37 and the inner peripheral surface 41 of the third member 9 may intersect. In such a case, the coolant discharged from the first outflow port 39 collides with the third inner peripheral surface 41, and the coolant flowing direction changes, and the direction toward the tip 3A and the direction toward the rotation axis O1 increases. , the coolant flows smoothly. Therefore, even when centrifugal force is applied to the coolant, the coolant can be more stably supplied to the cutting edge 21 .

As shown in FIG. 5, the first groove 19 and the second groove 29 may each have a shape that extends forward in the rotational direction O2 toward the rear end 3B. The first groove 19 and the second groove 29 may each have a twisted shape toward the rear in the rotational direction O2 toward the tip 3A. During cutting, the discharged coolant flows backward in the rotational direction O2 relative to the rotating tool body. Therefore, when the tool has the above configuration, the direction in which the first groove 19 and the second groove 29 extend coincides with the direction in which the coolant flows, so that the cutting edge 21 positioned along the first groove 19 can be efficiently cut. Can supply coolant well.

As shown in FIGS. 6 and 7, the width W4 of the first groove 19 may be larger than the width W5 of the second groove 29 in the circumferential direction of the rotation axis O1. In such a case, since the second grooves 29 are smaller than the first grooves 19 , it is difficult for chips generated during cutting to flow from the first grooves 19 to the second grooves 29 . Moreover, the coolant easily flows smoothly from the second groove 29 to the first groove 19 . In addition, when the widths of the first groove 19 and the second groove 29 are not constant, the above width may be evaluated in a cross section including the center of each groove and perpendicular to the rotation axis O1.

In one example shown in FIG. 8, the third member 9 is attached to the second member 7 . Specifically, as shown in FIG. 8, the portion of the second member 7 located between the second groove 29 and the shank portion 31 is connected to the portion located on the rear end 3B side of the third member 9. It is attached by

The second outer surface 27 may have a first thread groove 45 located closer to the rear end 3B than the second groove 29 is. The third member 9 has a second thread groove 47 screwed into the first thread groove 45 . Specifically, as shown in FIG. 8, the main body 3 has a first screw groove 45 in a portion of the second member 7 located between the second groove 29 and the shank portion 31, and a rear end of the third member 9. A second thread groove 47 is provided in a portion located on the side of 3B. In such a case, it is possible to adjust the position of the third member 9 in the direction along the rotation axis O1 by adjusting the degree of tightening of the screw, and it is possible to adjust the outflow direction of the coolant.

Examples of materials for the first member 5 include cemented carbide, cermet, and hard materials. Compositions of cemented carbide include, for example, WC--Co, WC--TiC--Co and WC--TiC--TaC--Co. WC—Co is produced by adding cobalt (Co) powder to tungsten carbide (WC) and sintering it. WC-TiC-Co is obtained by adding titanium carbide (TiC) to WC-Co. WC--TiC--TaC--Co is obtained by adding tantalum carbide (TaC) to WC--TiC--Co.

A cermet is a sintered composite material in which a metal is combined with a ceramic component. Specific examples of cermets include those containing titanium compounds such as titanium carbide (TiC) and titanium nitride (TiN) as main components. Examples of hard materials include cBN (Cubic Boron Nitride) and PCD (PolyCrystalline Diamond).

Examples of the material of the second member 7 include steel and cemented carbide. Compositions of cemented carbide include, for example, WC--Co, WC--TiC--Co and WC--TiC--TaC--Co. WC—Co is produced by adding cobalt (Co) powder to tungsten carbide (WC) and sintering it. WC-TiC-Co is obtained by adding titanium carbide (TiC) to WC-Co. WC--TiC--TaC--Co is obtained by adding tantalum carbide (TaC) to WC--TiC--Co. From the viewpoint of enhancing toughness, steel may be used as the material of the second member 7 .

As the material of the third member 9, steel, cast iron, aluminum alloy, or the like can be used.

The surface of the first member 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 includes titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), alumina (Al2O3), and the like.

<Manufacturing method for cutting products>
Next, an embodiment of a method for manufacturing a machined product according to the present invention will be described with reference to FIGS. 12 to 14. FIG. 12 to 14 are cross-sectional views of the workpiece 100 including the center of the machining hole, but the rotary tool 1 is shown in a side view, not a cross-sectional view, for convenience of explanation.

A method for manufacturing a cut workpiece according to an embodiment of the present invention comprises steps of rotating the above-described rotary tool 1 about a rotation axis O1, A step of bringing the workpiece 100 into contact with the rotary tool 1 and a step of separating the workpiece 100 from the rotary tool 1 are provided.

Specifically, the following steps (i) to (iii) are provided.

(i) As shown in FIG. 12, a step of rotating the rotary tool 1 in the rotation direction O2 around the rotation axis O1 and moving the rotary tool 1 in the Y1 direction so as to approach the workpiece 100;

In this step, the work material 100 and the rotary tool 1 may be brought relatively close to each other. For example, the work material 100 may be brought close to the rotary tool 1 .

(ii) Next, as shown in FIG. 13, by moving the rotary tool 1 closer to the work piece 100, the cutting edge 21 of the rotating rotary tool 1 touches the inner wall of the machining hole of the work piece 100. The step of contacting.

As a result, the inner wall of the processed hole can be made smooth. For example, if burrs remain in the machining hole of the work material 100, the burrs can be removed. In this step, the rotary tool 1 having a larger diameter than the hole to be machined in the work material 100 may be used so as to widen the diameter of the hole to be machined.

(iii) As shown in FIG. 14, a step of moving the rotary tool 1 in the Y2 direction to separate the rotary tool 1 from the workpiece 100;

Through the above steps, the inner wall of the machined hole can be smoothed, that is, excellent hole machinability can be exhibited, and the rotary tool 1 can have an excellent tool life. Therefore, it is possible to stably cut the inner wall of the machining hole of the work material 100 over a long period of time.

When the above-described cutting of the work material 100 is performed a plurality of times, for example, when smoothing the inner walls of a plurality of holes to be machined, the rotary tool 1 is kept rotated and The process of bringing the cutting edge 21 of the rotary tool 1 into contact with the inner wall of the machined hole located at different locations of the cutting material 100 may be repeated.

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

Although several embodiments according to the present invention have been exemplified above, it goes without saying that the present invention is not limited to the above-described embodiments, and can be arbitrarily adopted without departing from the gist of the present invention. .

DESCRIPTION OF SYMBOLS 1... Rotary tool 3... Main body 3A... First end (tip)
3B... second end (rear end)
5 first member 7 second member 9 third member 11 first outer surface 13 tip end surface 15 inclined surface 17 first outer peripheral surface 19 ... first groove 21 ... cutting edge 23 ... first cutting edge 25 ... second cutting edge 27 ... second outer surface 28 ... second outer peripheral surface 29 ... second Groove 31 shank portion 33 fixture 35 first flow path 37 second flow path 39 first outlet 41 inner peripheral surface 43 outer peripheral surface 45 First thread groove 47 Second thread groove 100 Work material O1 Rotation axis O2 Rotation direction L Length of body D Outside of body Diameter D1, D2, D3 ... Diameter P ... Contact point W1, W2, W3, W4, W5 ... Spacing (width)
C1, C2... Central axis N... Imaginary extension line Y1, Y2... Movement direction

Claims (7)

having a rod-shaped body extending along an axis of rotation from a first end toward a second end;
The body is
a first member located on the side of the first end;
a second member positioned closer to the second end than the first member;
a cylindrical third member into which the second member is inserted;
The first member is
a first outer surface;
a first groove extending from the first end toward the second end on the first outer surface;
a cutting edge located behind the first groove in the direction of rotation of the rotating shaft and extending along the first groove;
The second member is
a second outer surface;
a second groove extending from the first end side toward the second end on the second outer surface and connected to the first groove;
a first channel positioned inside the body and extending along the rotation axis;
a second channel extending from the first channel to the second groove;
The second flow path has a first outlet opening to the second groove,
The third member is positioned to surround the first outlet,
The rotary tool, wherein the cutting edge is further from the rotary shaft than the inner peripheral surface of the third member. The rotary tool according to claim 1, wherein the cutting edge is further away from the rotating shaft than the outer peripheral surface of the third member. The third member is positioned closer to the second end than the first member,
The rotary tool according to claim 1 or 2, wherein a portion of the second groove on the first end side opens to the outer peripheral side. The second flow path has a linear shape and extends in a direction toward the first end as it separates from the first flow path,
The rotary tool according to any one of claims 1 to 3, wherein the central axis of said second flow path intersects said third member. The rotary tool according to any one of claims 1 to 4, wherein the first groove and the second groove each have a shape directed forward in the rotational direction toward the second end. The rotary tool according to any one of claims 1 to 5, wherein the width of the first groove is larger than the width of the second groove in the circumferential direction of the rotating shaft. A step of rotating the rotary tool according to any one of claims 1 to 6;
bringing the rotating rotary tool into contact with a work material;
and a step of separating the rotary tool from the work material.

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