JP7276935B1 - Deburring tool and deburring method - Google Patents

Abstract

A deburring tool capable of preventing or suppressing damage to the deburring target surface of a work during deburring operation. A deburring tool (1) has a cylindrical shaft (2). Assuming that the distal end side of the shaft portion 2 is the first direction X1 and the base end side thereof is the second direction X2, the shaft portion 2 has a guide portion 6 having an annular guide surface 6a and a second direction of the guide surface 6a. A cutting edge forming portion 7 having an outer peripheral surface 11 continuous to X2 is provided. The cutting edge forming portion 7 has a groove 12 extending in the second direction X2 from the guide surface 6a on the outer peripheral surface 11 thereof. In the opening edge 20 of the groove 12 in the cutting edge forming portion 7, the opening edge 20 portions extending in the second direction X2 from the guide surface 6a are the cutting edges 25 and 26. As shown in FIG. In the deburring process, the guide surface 6a and the cutting edge forming portion 7 are brought into contact with the deburring target surface 50a while the deburring tool 1 is being rotated. [Selection drawing] Fig. 2

Description

TECHNICAL FIELD The present invention relates to a rod-shaped deburring tool that removes burrs by bringing its outer peripheral surface into contact with the deburring target surface of a work.

Such a deburring tool is described in US Pat. The deburring tool of the document includes an outer peripheral surface surrounding an axis, a front end face perpendicular to the axis, and a groove of constant width crossing the center of the front end face in a direction perpendicular to the axis. The groove extends parallel to the axis from the front end face of the deburring tool toward the proximal end. The front end portion of the deburring tool is divided into two cutting edges by a groove. The opening edge of the groove includes a leading edge portion with a continuous front end face and an outer peripheral edge portion with a continuous outer peripheral surface. A peripheral edge portion extends axially from the front end face. The peripheral edge portion is the cutting edge of the deburring tool.

When removing burrs, the deburring tool is oriented such that its axis is parallel to the deburring target surface of the work. Further, while the deburring tool is rotated about the axis, the outer peripheral surface of the shaft portion is brought into contact with the deburring target surface of the work, and the deburring tool is moved along the deburring target surface. As a result, the burrs present on the edge of the surface to be deburred are sheared off by the cutting blade.

Japanese Patent Application Laid-Open No. 2016-2618

The deburring tool of Patent Literature 1 has a problem that the cutting edge bites into the surface to be deburred during the deburring process and easily damages the surface of the work. This problem will be described with reference to FIGS. 14 and 15. FIG. FIG. 14 is a perspective view of the deburring tool disclosed in Patent Document 1. FIG. FIG. 15 is an explanatory view of the deburring operation of the deburring tool of Patent Document 1 when viewed from the front end face side of the deburring tool. FIG. 15(a) shows a state in which the outer peripheral surface of the deburring tool is in contact with the surface to be deburred. FIG. 15(b) shows a state in which the groove of the deburring tool faces the surface to be deburred. FIG. 15(c) shows a state in which the deburring tool is further rotated from the state in FIG. 15(b).

As shown in FIG. 14 , the deburring tool 100 of the document includes a shaft portion 101 . The shaft portion 101 includes an outer peripheral surface 102 surrounding its axis L0, a front end portion 103 perpendicular to the axis L0, and a groove 104 having a constant width crossing the center of the front end portion 103 in a direction orthogonal to the axis L0. The groove 104 extends from the front end portion 103 toward the proximal side in parallel with the axis L0. The opening edge of the groove 104 includes a leading edge portion 104a to which the front end portion 103 is continuous, and an outer peripheral edge portion 104b to which the outer peripheral surface 102 is continuous. The outer peripheral edge portion 104b extends from the front end portion 103 in the direction of the axis L0. The outer peripheral edge portion 104 b is the cutting edge 105 of the deburring tool 100 . In the shaft portion 101 , the inner wall surface of the groove 104 extending inward from the cutting edge 105 is the rake surface of the cutting edge 105 . A rake angle θ0 formed between the rake face and the outer peripheral surface 102 of the shaft portion 101 is an acute angle. In other words, the cutting edge 105 of the deburring tool 100 is sharp.

As shown in FIG. 15, when removing burrs, the deburring tool 100 is oriented such that its axis L0 is parallel to the deburring target surface 110a of the work 110. As shown in FIG. When removing burrs, as shown in FIG. 15(a), the outer peripheral surface 102 of the shaft portion 101 is moved to the surface 110a of the work 110 to be deburred while the deburring tool 100 is rotated about its axis. and move it along the deburring target surface 110a.

After that, as shown in FIG. 15(b), at the rotation angle position where the groove 104 of the rotating deburring tool 100 faces the deburring target surface 110a, the deburring tool 100 and the deburring target surface 110a face each other. In the direction, the arc-shaped outer peripheral surface 102 no longer exists between the deburring tool 100 and the deburring target surface 110a.

Here, the deburring tool 100 is always pressed against the deburring target surface 110a during the machining operation. Therefore, when the deburring tool 100 shifts from the state shown in FIG. 15(a) to the state shown in FIG. 15(b), the outer peripheral surface 102 no longer exists between the deburring tool 100 and the deburring target surface 110a. The shaft portion 101 is brought closer to the burr removal target surface 110a by this amount. That is, the axis L0 of the shaft portion 101 approaches the deburring target surface 110a, and the deburring target surface 110a is positioned inside the outer peripheral surface 102 of the shaft portion 101. FIG. Therefore, as shown in FIG. 15(c), when the deburring tool 100 rotates further, the cutting edge 105, which is the opening edge of the groove 104 provided on the outer peripheral surface 102, scrapes the deburring target surface 110a. .

In view of the above problems, an object of the present invention is to provide a deburring tool capable of preventing or suppressing damage to the deburring target surface of the work during deburring operation.

In order to solve the above problems, the deburring tool of the present invention has a cylindrical shaft portion, and the direction along the axis of the shaft portion is such that one side of the axial direction is the front side and the other side is the rear side. In this case, the shaft portion includes a guide portion having an annular guide surface around an axis, and a cutting edge forming portion including a cutting edge extending rearward from the guide surface, the cutting edge forming portion comprising: an outer peripheral surface that continues to the rear of the guide surface, and a groove provided in the outer peripheral surface, the groove extending rearward from the guide surface and having the deepest depth at the central portion in the axial direction; The opening edge portion extending rearward from the guide surface at the opening edge of the groove in the cutting edge forming portion is shallower from the central portion toward the front and shallower toward the rear from the central portion. , a cutting edge, and when viewed from the axial direction, the cutting edge forming portion overlaps the guide portion in its entirety.

According to the present invention, the shank is provided with a guide portion having an annular outer peripheral surface on the front side of the cutting edge forming portion where the cutting edge is provided. Further, the cutting edge forming portion overlaps the guide portion in its entirety when viewed from the axial direction. That is, the cutting edge forming portion does not have a portion that protrudes outward from the guide surface. Therefore, when removing burrs by bringing the rotating shaft portion into contact with the deburring target surface of the workpiece, if the guide portion is brought into contact with the deburring target surface, the deburring target surface will be located on the inner peripheral side of the guide surface. can be prevented or suppressed from being located in Therefore, it is possible to prevent or suppress the cutting edge provided in the cutting edge forming portion from shaving the surface to be deburred.

Further, according to the present invention, since the cutting edge forming portion having the cutting edge has the outer peripheral surface that continues behind the guide surface, it is easier to prevent the cutting edge from shaving the surface to be deburred. Further, according to the present invention, the depth of the groove is the deepest at the central portion in the axial direction, becomes shallower from the central portion toward the distal end side, and becomes shallower from the central portion toward the second direction. . Therefore, burrs sheared by the cutting edge are easily discharged from the groove.

In the present invention, the groove includes a first inner wall surface and a second inner wall surface that face each other in a circumferential direction around the axis, and an inner circumferential end of the first inner wall surface and the second inner wall surface that extend in the circumferential direction. a bottom surface connecting the end of the wall surface on the inner peripheral side, wherein the opening edge portion includes a corner portion where the first inner wall surface and the outer peripheral surface intersect, and a corner portion where the second inner wall surface and the outer peripheral surface meet. It may be a corner that meets. With this configuration, the deburring operation can be performed regardless of the direction of rotation of the deburring tool.

In the present invention, the groove may extend in the axial direction with a constant width, and the first inner wall surface and the second inner wall surface may each extend in a radial direction about the axis.

By the way, the teeth of the helical gear are formed by hobbing or skyping. These cutting processes generate large burrs as compared to general cutting processes. Here, when the burr becomes large, the strength of the root portion of the burr increases. Therefore, when removing burrs generated on the helical gear, a load is applied to the cutting edge of the deburring tool. Therefore, when the cutting edge has an acute angle, chipping is likely to occur on the cutting edge. On the other hand, if the first inner wall surface and the second inner wall surface of the groove, which serve as the rake surfaces of the cutting edges, respectively extend in the radial direction, each cutting edge is perpendicular. That is, the angle formed by the outer peripheral surface of the cutting edge forming portion and the first inner wall surface, which is the rake surface of one of the cutting edges, is 90°. The angle formed by the outer peripheral surface of the cutting edge forming portion and the second inner wall surface, which is the rake surface of the other cutting edge, is 90°. Therefore, even when the deburring tool is used to remove high-strength burrs such as burrs generated on a helical gear, it is possible to prevent or suppress the occurrence of chipping on the cutting edge.

In the present invention, the cutting edge forming portion may have a constant outer diameter in the axial direction.

In the present invention, the cutting edge forming portion may have an outer diameter that decreases in the second direction. In this way, when the rear end side of the shank is inclined in a direction approaching the surface to be deburred during deburring, the rear end portion of the cutting edge is prevented or suppressed from damaging the surface to be deburred. can.

The shaft portion may include, at the end in the first direction, a front end portion having an annular curved outer peripheral surface that curves inwardly from the guide surface toward the first direction. By providing such a front end portion, it is possible to prevent or suppress damage to the surface to be deburred by the tip of the shaft portion when the shaft portion is inclined with respect to the surface to be deburred during deburring.

In the present invention, the shaft portion may include a columnar portion having the same outer diameter as that of the guide portion in the second direction of the cutting edge forming portion. In this case, if the deburring operation is performed while the guide portion and the cylindrical portion are in contact with the surface to be deburred, it is possible to prevent the base end of the shaft from tilting toward the surface to be deburred during the deburring process. can be prevented. Therefore, it is possible to prevent or suppress the surface to be deburred from being damaged by the proximal portion of the cutting edge.

In the present invention, the rake face of the cutting edge extending radially inward from the cutting edge extends radially, and the flank of the cutting edge extending circumferentially from the cutting edge is It may extend inside the guide surface. In this way, a sharp cutting edge can be provided.

Next, in the deburring method of the present invention, the rear end portion of the shaft portion of the deburring tool is attached to a machine tool via a radial floating holder, and the radial floating holder and the deburring tool are attached to the axis line. The guide part and the cutting edge forming part are brought into contact with the burr removal target surface of the workpiece while being rotated around, and are moved along the burr removal target surface to remove burrs from the burr removal target surface. and

If the deburring tool is attached to the machine tool via the radial floating holder and the deburring operation is performed, the burrs rising from the surface to be deburred are too hard to be sheared by the cutting edge. The force acting on the cutting edge forming portion causes the shaft portion to move in a direction perpendicular to the axis. That is, when the burr cannot be sheared, the cutting edge forming portion having the cutting edge moves away from the surface to be deburred. Therefore, it is possible to prevent or suppress damage to the deburring target surface caused by the cutting edge biting into the burr and the deburring target surface during the deburring process. In addition, due to the presence of burrs with high hardness, it is possible to prevent or suppress the occurrence of chipping on the cutting edge during deburring.

According to the deburring tool and the deburring method of the present invention, it is possible to prevent or suppress the cutting edge from damaging the deburring target surface of the work.

1 is a perspective view of a deburring tool of Example 1. FIG. 1 is a side view of the deburring tool of Example 1. FIG. FIG. 3 is a cross-sectional view taken along line AA of FIG. 2; FIG. 3 is a cross-sectional view taken along line BB of FIG. 2; It is explanatory drawing of the deburring method using a deburring tool. 4 is a flow chart of a deburring method; It is explanatory drawing of the deburring operation|movement which removes the burr of a bevel gear. It is explanatory drawing of the deburring tool of a modification. It is explanatory drawing of the deburring method using the deburring tool of a modification. FIG. 10 is a perspective view of the deburring tool of Example 2; FIG. 10 is a side view of the deburring tool of Example 2; FIG. 12 is a sectional view taken along line CC of FIG. 11; FIG. 12 is a cross-sectional view taken along line DD of FIG. 11; 1 is a perspective view of a conventional deburring tool; FIG. FIG. 5 is an explanatory diagram of deburring operation by a conventional deburring tool;

A deburring tool and a deburring method according to embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a deburring tool. In FIG. 1, the deburring tool is viewed from the front side. FIG. 2 is a side view of the deburring tool. FIG. 3 is a cross-sectional view taken along line AA of FIG. In FIG. 3, the deburring tool is cut along the axis. 4 is a cross-sectional view taken along line BB of FIG. 1. FIG. In FIG. 4, the cutting edge forming portion of the deburring tool is cut in a direction perpendicular to the axis. As shown in FIG. 1, the deburring tool 1 of this example has a cylindrical shaft portion 2. As shown in FIG. The shaft portion 2 is made of cemented carbide or high-speed tool steel (HSS). In the following description, the direction along the axis L of the shaft portion 2 is defined as the axial direction X, the front side of the shaft portion 2 in the axial direction X is the first direction X1, and the side opposite to the first direction X1 in the axial direction X (rear side) is the second direction X2. The second direction X2 is the base end side of the shaft portion 2 .

As shown in FIGS. 1 to 3, the shaft portion 2 includes a front end portion 5, a guide portion 6, a cutting edge forming portion 7, a cylindrical portion 8, and a shank from the end in the first direction X1 toward the second direction X2. A part 9 is provided in this order. The front end portion 5 includes a circular front end face 5a and an annular curved outer peripheral face 5b that curves in the second direction X2 toward the outer peripheral side from the front end face 5a.

The guide portion 6 has an annular guide surface 6a around the axis. The guide surface 6a has a constant width in the axial direction X in the circumferential direction. The curved outer peripheral surface 5b of the front end portion 5 continues without a step to the end of the guide surface 6a in the first direction X1. In other words, the front end portion 5 has an annular curved outer peripheral surface 5b that curves inward from the guide surface 6a of the guide portion 6 toward the first direction X1.

The cutting edge forming portion 7 overlaps the guide portion 6 as a whole when viewed from the axial direction X. As shown in FIG. That is, as shown in FIG. 4, the cutting edge forming portion 7 does not have a portion that protrudes outward from the guide surface 6a when viewed from the axial direction X. As shown in FIG. The cutting edge forming portion 7 includes an outer peripheral surface 11 that continues in the second direction X2 of the guide surface 6a. In addition, the cutting edge forming portion 7 has a plurality of grooves 12 extending from the guide portion 6 in the second direction X2 on its outer peripheral surface 11 . The outer peripheral surface 11 is an arcuate surface centered on the axis L. As shown in FIG. In this example, the cutting edge forming portion 7 has six grooves 12 . Each groove 12 extends in the axial direction X with a constant width.

As shown in FIG. 2, each groove 12 has a rectangular shape elongated in the axial direction X when viewed from the radial direction. Each groove 12 includes a first inner wall surface 13 and a second inner wall surface 14 that face each other in the circumferential direction around the axis. Each groove 12 also has a rectangular bottom surface 17 elongated in the axial direction X when viewed from the radial direction. The bottom surface 17 extends in the circumferential direction and connects the inner peripheral end of the first inner wall surface 13 and the inner peripheral end of the second inner wall surface 14 .

Here, as shown in FIG. 3, each groove 12 has the deepest depth in the central portion in the axial direction X, becomes shallower in the first direction X1 from the central portion, and extends in the second direction X2 from the central portion. It becomes shallow toward. The end of the bottom surface 17 in the first direction X1 is at the same height as the outer peripheral surface 11 . That is, the end of the bottom surface 17 in the first direction X1 has the same height as the guide surface 6a. Also, the end of the bottom surface 17 in the second direction X2 is at the same height as the outer peripheral surface 11 . That is, the end of the bottom surface 17 in the second direction X2 has the same height as the annular outer peripheral surface 8a of the columnar portion 8 . The cross-sectional shape of the bottom surface 17 of the groove 12 is an arc in which the central portion in the axial direction X is recessed inward.

As shown in FIG. 2, the opening edge 20 of each groove 12 in the cutting edge forming portion 7 is rectangular. The opening edge 20 of each groove 12 comprises a first opening edge portion 21 and a second opening edge portion 22 which are circumferentially opposed. The opening edge 20 includes a third opening edge portion 23 connecting the end of the first opening edge portion 21 in the first direction X1 and the end of the second opening edge portion 22 in the first direction X1, and the first opening edge portion and a fourth opening edge portion 24 connecting the end of the second opening edge portion 21 in the second direction X2 and the end of the second opening edge portion 22 in the second direction X2. The first opening edge portion 21 and the second opening edge portion 22 each extend from the guide surface 6a in the second direction X2.

A first opening edge portion 21 extending in the second direction X2 from the guide surface 6 a is a first cutting edge 25 at the opening edge 20 of each groove 12 in the cutting edge forming portion 7 . A second cutting edge 26 is a second opening edge portion 22 extending in the second direction X<b>2 from the guide surface 6 a at the opening edge 20 of each groove 12 . Here, the first opening edge portion 21 is the edge of the first inner wall surface 13 on the outer peripheral side, and the second opening edge portion 22 is the edge of the second inner wall surface 14 on the outer peripheral side. Therefore, the first cutting edge 25 is a corner portion where the first inner wall surface 13 and the outer peripheral surface 11 of the cutting edge forming portion 7 intersect. The second cutting edge 26 is a corner portion where the second inner wall surface 14 and the outer peripheral surface 11 of the cutting edge forming portion 7 intersect. Further, the first inner wall surface 13 continuous to the inner peripheral side of the first opening edge portion 21 is the first rake face of the first cutting edge 25 . A second inner wall surface 14 continuous with the inner peripheral side of the second opening edge portion 22 is a second rake face of the second cutting edge 26 .

As shown in FIG. 4, the first inner wall surface 13 and the second inner wall surface 14 of each groove 12 extend radially about the axis L, respectively. That is, the rake face (first inner wall surface 13) of the first cutting edge 25 extends in the radial direction. On the other hand, the flank surface of the first cutting edge 25 is the outer peripheral surface 11 of the shaft portion 2 . Therefore, the clearance angle of the first cutting edge 25 is 0°. Therefore, the first angle θ1 formed by the outer peripheral surface 11 (flank surface) of the cutting edge forming portion 7 and the rake surface of the first cutting edge 25 is 90°. That is, the first cutting edge 25 is right-angled. The second inner wall surface 14, which is the rake face of the second cutting edge 26, extends radially. On the other hand, the clearance surface of the first cutting edge 25 is the outer peripheral surface 11 of the shaft portion 2, and the clearance angle of the first cutting edge 25 is 0.
°. Therefore, the second angle θ2 formed by the outer peripheral surface 11 of the cutting edge forming portion 7 and the second inner wall surface 14, which is the rake surface of the second cutting edge 26, is 90°. That is, the second cutting edge 26 is right-angled.

As shown in FIG. 1, the cylindrical portion 8 has an annular outer peripheral surface 8a. The outer diameter dimension of the annular outer peripheral surface 8a is the same as the outer diameter dimension of the guide surface 6a. The annular outer peripheral surface 8a has a constant width in the axial direction X in the circumferential direction. Here, the outer diameter dimension of the cutting edge forming portion 7 is the same as the outer diameter dimension of the guide portion 6 and the outer diameter dimension of the cylindrical portion 8 . Further, the outer diameter dimension of the cutting edge forming portion 7 is constant in the axial direction X. As shown in FIG. Therefore, the outer peripheral surface 11 of the cutting edge forming portion 7 and the guide surface 6a of the guide portion 6 are continuous without a step. Further, the outer peripheral surface 11 of the cutting edge forming portion 7 and the annular outer peripheral surface 8a of the cylindrical portion 8 are continuous without a step.

The shank portion 9 is a portion located in the second direction X2 relative to the cylindrical portion 8 . The shank portion 9 is a portion that is chucked by the spindle of the machine tool. In this example, the shank portion 9 is cylindrical. Further, the outer diameter of the shank portion 9 is the same as that of the cylindrical portion 8, and there is no boundary between the cylindrical portion 8 and the shank portion 9. The shank portion 9 may be D-cut or the like.

(Deburring method)
FIG. 5 is an explanatory diagram of a deburring method using the deburring tool 1. FIG. FIG. 6 is a flowchart of a deburring method using the deburring tool 1. FIG. In the example shown in FIG. 5, the workpiece 50 is a helical gear. The burr removal target surface 50a of the workpiece 50 is the end face of the tooth portion of the helical gear and the portion of the end face of the helical gear adjacent to the inner peripheral side of the tooth portion. In the example shown in FIG. 5, the deburring tool 1 removes burrs 55 generated on the edges of the end faces of the teeth of the helical gear.

As shown in FIGS. 5 and 6, when deburring the work 50, the deburring tool 1 is attached to the spindle 52a of the machine tool 52 via the radial floating holder 51 (step ST1). After that, the machine tool 52 is driven to rotate the deburring tool 1 about the axis in the first rotation direction R1, and the guide surface 6a and the outer peripheral surface 11 of the cutting edge forming portion 7 are placed on the workpiece 50 to be deburred. It is brought into contact with the surface 50a and moved along the surface 50a to be deburred (step ST2). As a result, the deburring tool 1 shears off the burrs 55 present at the edge of the deburring target surface 50a. The first cutting edge 25 is used when the deburring tool 1 is rotated in the first rotation direction R1.

In this example, the annular outer peripheral surface 8a of the cylindrical portion 8 is not brought into contact with the deburring target surface 50a. Further, during the deburring process, the curved outer peripheral surface 5b of the front end portion 5 does not come into contact with the deburring target surface 50a. The direction of rotation of the deburring tool 1 may be opposite to the first direction of rotation R1. In this case, the cutting edge that shears the burr 55 is the second cutting edge 26 .

Here, the radial floating holder 51 is a general one. The radial floating holder 51 holds the deburring tool 1 so as to be able to advance and retreat in the orthogonal direction orthogonal to the axis L thereof. In addition, when the guide surface 6a and the outer peripheral surface 11 of the cutting edge forming portion 7 are in contact with the deburring target surface 50a of the work 50 during deburring, the radial floating holder 51 is positioned such that the deburring tool 1 deburrs the work 50. The deburring tool 1 is brought into contact with the deburring target surface 50a by generating an urging force corresponding to the force (reaction force) received from the deburring surface 50a.

(Effect)
According to this example, the shaft portion 2 of the deburring tool 1 has an annular outer peripheral surface 11 on the tip side of the cutting edge forming portion 7 provided with the first cutting edge 25 and the second cutting edge 26 . A part 6 is provided. Further, the cutting edge forming portion 7 overlaps the guide portion 6 as a whole when viewed from the axial direction X. As shown in FIG. That is, the cutting edge forming portion 7 does not have a portion that protrudes outward from the guide surface 6a. Therefore, when the burr 55 is removed by bringing the outer peripheral surface 11 of the rotating shaft portion 2 into contact with the deburring target surface 50a of the workpiece 50, if the guide portion 6 is brought into contact with the deburring target surface 50a, the burr can be removed. It is possible to prevent or suppress the target surface 50a from being located on the inner peripheral side of the guide surface 6a. Therefore, it is possible to prevent or suppress the cutting edges 25 and 26 from scraping the surface 50a to be deburred.

That is, in the conventional deburring tool 100 in which the deburring tool 1 does not have the guide portion 6, as shown in FIG. At the position, the shaft portion 101 approaches the deburring target surface 110 a and the deburring target surface 110 a is located inside the outer peripheral surface 102 of the shaft portion 101 . Therefore, as shown in FIG. 15(c), when the deburring tool 100 rotates further, the cutting edge 105, which is the opening edge of the groove 104 provided on the outer peripheral surface 102, scrapes the deburring target surface 110a. Sometimes. In contrast, when the deburring tool 1 of this example is used, the occurrence of such a situation can be prevented or suppressed.

Further, in this example, the cutting edge forming portion 7 having the cutting edges 25 and 26 is provided with an outer peripheral surface 11 that continues behind the guide surface 6a. Therefore, it is easier to prevent the cutting edges 25 and 26 from scraping the surface to be deburred.

Next, the tooth portion of the helical gear is formed by hobbing or skyping. These cutting processes generate large burrs 55 as compared with general cutting processes. Here, as the burr 55 becomes larger, the strength of the root portion of the burr increases. Therefore, when removing the burr 55 generated on the helical gear, a load is applied to the cutting edges 25 and 26 of the deburring tool 1 . Therefore, when the cutting edges 25 and 26 have an acute angle, there is a problem that the cutting edges 25 and 26 are likely to be chipped.

On the other hand, in this example, the first inner wall surface 13 and the second inner wall surface 14 of the groove 12, which serve as rake surfaces for the cutting edges 25 and 26, extend radially. As a result, the first cutting edge 25 and the second cutting edge 26 are perpendicular. Therefore, according to the deburring tool 1 of this example, chipping occurs on the cutting edges 25 and 26 during the deburring process, compared to the case of using the deburring tool 100 having the cutting edge 105 at an acute angle shown in FIG. can be prevented or suppressed.

Further, in this example, the deburring tool 1 is attached to the machine tool via the radial floating holder 51 to perform the deburring operation. Therefore, when the hardness of the burr 55 present on the burr removal target surface 50a is so high that the burr 55 cannot be sheared by the cutting edges 25 and 26, the force acting on the cutting edge forming portion 7 from the burr 55 side causes the shaft portion 2 to move along the axis. Move in the orthogonal direction perpendicular to L. That is, when the burr 55 cannot be sheared, the cutting edge forming portion 7 having the cutting edges 25 and 26 moves away from the burr removal target surface 50a. Therefore, it is possible to prevent or suppress the cutting edges 25 and 26 from biting the burr 55 and the deburring target surface 50a and damaging the deburring target surface 50a during the deburring process. In addition, due to the presence of the burr 55 having a high hardness, it is possible to prevent or suppress the occurrence of chipping on the cutting edges 25 and 26 during the deburring process.

Furthermore, the depth of the groove 12 is the deepest in the central portion in the axial direction X, becomes shallower from the central portion toward the tip side, and becomes shallower in the second direction X2 from the central portion. Therefore, the burrs 55 sheared by the cutting blades 25 and 26 are easily discharged from the groove 12 to the outside.

Further, the shaft portion 2 includes a front end portion 5 having an annular curved outer peripheral surface 5b that curves inward in the first direction X1 from the guide surface 6a at the end in the first direction X1. Therefore, when the shaft portion 2 is inclined with respect to the deburring target surface 50a during the deburring process, it is possible to prevent or suppress the tip of the shaft portion 2 from damaging the deburring target surface 50a.

Further, in this example, the groove 12 includes a first inner wall surface 13 and a second inner wall surface 13 facing each other in the circumferential direction around the axis L.
An inner wall surface 14 is provided. The outer peripheral edge of the first inner wall surface 13 is a first cutting edge 25 , and the outer peripheral edge of the second inner wall surface 14 is a second cutting edge 26 . Therefore, deburring can be performed regardless of the direction of rotation of the deburring tool 1 .

Here, according to the deburring method using the deburring tool 1, even if the deburring target surface 50a of the workpiece 50 is a curved surface, the deburring target surface 50a can be deburred while suppressing damage to the deburring target surface 50a. The burr 55 generated on the edge of 50a can be removed. FIG. 7 is an explanatory diagram of a deburring operation for removing burrs generated on the end faces of the teeth of the bevel gear.

As shown in FIG. 7, the bevel gear 60 includes a cylindrical portion 61 and an umbrella-shaped tooth portion 62 provided on one side of the cylindrical portion 61 along the center line M in the center line direction. The tooth portion 62 protrudes outward from the cylindrical portion 61 . The tooth portion 62 includes an annular first tapered surface 62 a that is continuous with the outer peripheral surface of the cylindrical portion 61 on the cylindrical portion 61 side. The first tapered surface 62a is inclined toward the cylindrical portion 61 toward the inner peripheral side. Further, the tooth portion 62 has an annular second tapered surface 62b on the side opposite to the cylindrical portion 61 . The second tapered surface 62b is inclined toward the cylindrical portion 61 toward the inner peripheral side.

Here, when forming the teeth in the tooth portion 62 by cutting, burrs 65 are generated on the edge of the first tapered surface 62a and the edge of the second tapered surface 62b. When removing the burr 65 generated on the edge of the first tapered surface 62a, as shown by the solid line in FIG. The deburring tool 1 and the bevel gear 60 are relatively moved around the center line of the cylindrical portion 61 while being in contact with the 1-tapered surface 62a. When removing the burr 65 generated on the edge of the second tapered surface 62b, as shown by the broken line in FIG. are in contact with the second tapered surface 62b, the deburring tool 1 and the bevel gear 60 are relatively moved around the center line of the cylindrical portion 61. As shown in FIG. In this way, even if the burr removal target surface 50a is a tapered surface, the burrs 65 generated at the edge of the burr removal target surface 50a can be removed without damaging the burr removal target surface 50a.

(Other deburring methods)
Here, in the deburring tool 1 of this example, the shaft portion 2 is provided with the cylindrical portion 8 having the same outer diameter as that of the guide portion 6 in the second direction X2 of the cutting edge forming portion 7 . Therefore, when removing the burrs formed on the opening edge of the hole formed in the burr removal target surface 50a, the guide surface 6a of the guide portion 6 and the annular outer peripheral surface 8a of the cylindrical portion 8 should be moved during the deburring process. The burr 55 can also be removed by moving the deburring tool 1 in contact with the burr removal target surface 50a. That is, deburring can be performed by bringing the annular outer peripheral surface 8a of the cylindrical portion 8 into contact with the deburring target surface 50a as a second guide surface. In this case, since the annular surfaces (the guide surface 6a and the annular outer peripheral surface 8a) having the same outer diameter as the cutting edge forming portion 7 are present on both sides of the cutting edge forming portion 7 in the axial direction X, deburring is possible. It is possible to prevent the shaft portion 2 from tilting away from the deburring target surface 50a during processing. Therefore, the cutting edges 25 and 26 do not bite into the deburring target surface 50a. Therefore, it is possible to prevent or suppress the deburring tool 1 from damaging the deburring target surface 50a.

(Modification)
FIG. 8 is a side view of a modified deburring tool. In FIG. 8, the shape of the cutting edge forming portion 7 is shown in an exaggerated manner. FIG. 9 is an explanatory diagram of a deburring method using the deburring tool of FIG. In the deburring tool 1A of this example, the outer diameter dimension of the cutting edge forming portion 7 becomes smaller in the second direction X2, but other configurations are the same as those of the deburring tool 1 described above. Accordingly, the same reference numerals are given to the corresponding parts, and detailed description thereof will be omitted.

In the deburring tool 1A of this example, the outer diameter dimension of the cutting edge forming portion 7 decreases in the second direction X2. That is, the cutting edge forming portion 7 has a tapered outer peripheral surface 11 whose outer diameter dimension decreases in the second direction X2 from the guide surface 6a. A plurality of grooves 12 extending in the axial direction X with a constant width are provided on the outer peripheral surface 11 . Of the opening edge 20 of the groove 12 in the cutting edge forming portion 7, a first opening edge portion 21 and a second opening edge portion 22 extending in the second direction X2 are cutting edges 25 and 26, respectively. Here, the inclination of the outer peripheral surface 11 is very slight. In this example, the end of the cutting edge forming portion 7 in the first direction X1 (the boundary with the guide portion 6) has the same diameter as the guide surface 6a, but the end of the cutting edge forming portion 7 in the second direction X2 has the same diameter as the guide surface 6a. The diameter is 1 mm shorter than the diameter of the guide surface 6a.

The shape of the cutting edge forming portion 7 in the deburring tool 1A is for coping with the inclination of the deburring tool 1A that occurs during the deburring process. That is, when the shank portion 9 (the rear end portion of the shaft portion 2) of the deburring tool 1A is attached to the spindle 52a of the machine tool 52 via the radial floating holder 51 for deburring, the deburring tool The guide portion 6 and the cutting edge forming portion 7 of 1A are pressed against the burr removal target surface 50a of the workpiece 50 . Therefore, during the deburring process, the reaction force F applied from the deburring target surface 50a to the guide portion 6 and the cutting edge forming portion 7 causes the radial floating holder 51 to move the axis L of the deburring tool 1A parallel to the deburring target surface 50a. may not be maintained in good condition. In this case, as shown in FIG. 9, the axis L of the deburring tool 1A is inclined with respect to the rotation axis N of the spindle 52a of the machine tool 52, and the deburring tool 1A is connected to the radial floating holder 51. The second direction X2 side approaches the deburring target surface 50a.

Here, when the deburring tool 1A is tilted, the rear end side portions (base end side portions) of the cutting edges 25 and 26 separated from the guide surface 6a in the second direction X2 bite into the deburring target surface 50a, and the burr is removed. The removal target surface 50a is damaged.

For this problem, the outer diameter dimension of the cutting edge forming portion 7 becomes smaller in the second direction X2. Therefore, even when the deburring tool 1A is inclined, it is possible to prevent or suppress the base end side portions of the cutting edges 25 and 26 separated from the guide surface 6a in the second direction X2 from biting into the deburring target surface 50a. Therefore, it is possible to prevent or suppress the deburring tool 1A from damaging the deburring target surface 50a during the deburring process.

(Other forms)
The number of grooves 12 provided in the cutting edge forming portion 7 is not limited to six. In addition, each groove 12 may widen in the second direction X2. In this case, the first cutting edge 25 and the second cutting edge 26 are inclined in the direction of separating from each other in the second direction X2. Also, each groove 12 may be widened in the first direction X1. In this case, the first cutting edge 25 and the second cutting edge 26 are inclined in the direction of separating from each other in the first direction X1. Further, each groove 12 may be inclined to one side in the circumferential direction from the guide surface 6a toward the second direction X2.

(Example 2)
FIG. 10 is a perspective view of the deburring tool of Example 2. FIG. FIG. 11 is a side view of the deburring tool of Example 2. FIG. 12 is a cross-sectional view taken along line CC of FIG. 11. FIG. 13 is a cross-sectional view taken along line DD of FIG. 11. FIG. In FIG. 10, the deburring tool 1B of this example is seen from the front side. In FIG. 12, the deburring tool 1B is cut along the axis L1. In FIG. 13, the cutting edge forming portion 7 of the deburring tool 1B is cut in a direction perpendicular to the axis L1. The deburring tool 1B of the second embodiment has a configuration corresponding to that of the deburring tool 1 described above, so the corresponding configurations are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 10, the deburring tool 1B of this example has a cylindrical shaft portion 2. As shown in FIG. The shaft portion 2 includes a front end portion 5, a guide portion 6, and a cutting edge forming portion 7 from the end in the first direction X1 toward the second direction X2.
, a cylindrical portion 8 and a shank portion 9 in this order. The front end portion 5 includes a circular front end face 5a and an annular curved outer peripheral face 5b that curves in the second direction X2 toward the outer peripheral side from the front end face 5a. The guide portion 6 includes an annular guide surface 6a around the axis L1. The guide surface 6a has a constant width in the axial direction X in the circumferential direction. The front end portion 5 includes an annular curved outer peripheral surface 5b that curves inward from the guide surface 6a of the guide portion 6 toward the first direction X1.

The cylindrical portion 8 has an annular outer peripheral surface 8a. The outer diameter dimension of the annular outer peripheral surface 8a is the same as the outer diameter dimension of the guide surface 6a. The annular outer peripheral surface 8a has a constant width in the axial direction X in the circumferential direction. The shank portion 9 is a portion located in the second direction X2 relative to the cylindrical portion 8 .

The cutting edge forming portion 7 is a portion of the shaft portion 2 located between the guide portion 6 and the cylindrical portion 8 in the axial direction X. As shown in FIG. As shown in FIG. 13 , the cutting edge forming portion 7 overlaps the guide portion 6 as a whole when viewed from the axial direction X. As shown in FIG. That is, as shown in FIG. 13, the cutting edge forming portion 7 does not have a portion that protrudes outward from the guide surface 6a when viewed from the axial direction X. As shown in FIG. As shown in FIGS. 10 and 13, the cutting edge forming portion 7 includes four edge portions 30 provided at equal angular intervals around the axis L1. In addition, the cutting edge forming portion 7 includes four concave portions 31 recessed inwardly between the edge portions 30 in the circumferential direction. As shown in FIGS. 10 and 11, each blade portion 30 has a cutting edge 32 extending from the guide surface 6a in the second direction X2 on one side in the circumferential direction. Accordingly, the cutting edge forming portion 7 includes four cutting edges 32 provided at equal angular intervals around the axis L1.

Each cutting edge 32 extends parallel to the axis L1 from the guide surface 6a toward the second direction X2. Here, each cutting edge 32 overlaps the guide surface 6a when viewed from the direction of the axis L1. That is, as shown in FIG. 10, each cutting edge 32 defines a virtual cylinder V that extends in the second direction X2 from the guide surface 6a coaxially with the guide portion 6 and has the same outer diameter. extends in the second direction X2 while being in contact with .

As shown in FIGS. 11 and 13 , each blade portion 30 includes a rake face 30 a extending radially inward from the cutting edge 32 . Therefore, the rake angle of the cutting edge 32 is 90°. Each blade portion 30 also has a flank 30b extending from the cutting edge 32 in the circumferential direction. As shown in FIG. 13, when viewed from the direction of the axis L1, the flank 30b extends linearly inside the guide surface 6a. Accordingly, the clearance angle of each cutting edge 32 is greater than 0°. Thus, each cutting edge 32 is sharp. In the flank surface 30b, the edge 30c on the side opposite to the cutting edge 32 in the circumferential direction has an arcuate shape in which the central portion in the axial direction X is recessed toward the cutting edge 32 side. The guide surface 6a continues to the end 30d of the edge 30c in the first direction X1 in the first direction X1. The annular outer peripheral surface 8a of the cylindrical portion 8 continues to the second direction X2 of the end 30e of the edge 30c in the second direction X2.

Here, the edge 30c opposite to the cutting edge 32 in the circumferential direction of the flank 30b is the opening edge portion of the opening edge of the recess 31 on one side in the circumferential direction. The opening edge on the other side in the circumferential direction of the opening edge of the recess 31 is the cutting edge 32 of the blade portion 30 positioned on the other side in the circumferential direction of the recess 31 . Each recess 31 is long in the axial direction X when viewed from the radial direction. As shown in FIG. 12, each recess 31 has the deepest depth in the central portion in the axial direction X, becomes shallower in the first direction X1 from the central portion, and becomes shallower in the second direction X2 from the central portion. Become.

When deburring the workpiece 50 using the deburring tool 1B of this example, the deburring tool 1B is moved through the radial floating holder 51 in the same manner as the deburring direction of the deburring tool 1B shown in FIG. , is attached to the spindle 52a of the machine tool 52 (step ST1). Thereafter, the machine tool 52 is driven to rotate the deburring tool 1B about the axis L1 in the second rotation direction R2, and the guide surface 6a and the outer peripheral surface 11 of the cutting edge forming portion 7 are deburred from the workpiece 50. It is brought into contact with the target surface 50a and moved along the burr removal target surface 50a (step ST2). As a result, the deburring tool 1B removes the burrs 55 present on the edge of the deburring target surface 50a.
to shear. In this example, the deburring tool 1B is not used by being rotated in the first rotation direction R2.

Note that the flank 30b extending in the circumferential direction from the cutting edge 32 may be curved. For example, the flank 30b may be an arc that curves away from the guide surface 6a as it separates from the cutting edge 32 inside the guide surface 6a when viewed from the direction of the axis L1.

Also in this example, the shaft portion 2 of the deburring tool 1B is provided with the guide portion 6 having the annular outer peripheral surface 11 on the tip side of the cutting edge forming portion 7 provided with the cutting edge 32 . Therefore, when the cutting edge forming portion 7 of the rotating shaft portion 2 is brought into contact with the deburring target surface 50a of the workpiece 50 to remove the burr 55, if the guide portion 6 is brought into contact with the deburring target surface 50a, It is possible to prevent or suppress the burr removal target surface 50 a from being located on the inner peripheral side of each cutting edge 32 . Therefore, it is possible to prevent or suppress the cutting edge 32 from scraping the surface 50a to be deburred.

Also in the deburring tool 1B of this example, the outer diameter dimension of the cutting edge forming portion 7 may be reduced in the second direction X2. That is, the cutting edge 32 of each blade portion 30 may be slightly inclined toward the inner peripheral side in the second direction X2. In this case, when each cutting edge 32 is defined as a virtual truncated cone that is coaxial with the guide portion 6 and has an outer diameter that decreases in the second direction X2 from the guide surface 6a, this virtual truncated cone provided so as to be in contact with With this configuration, even if the deburring tool 1B is inclined during deburring processing in which the deburring tool 1B is connected to the spindle 52a of the machine tool 52 through the radial floating holder 51 and deburring is performed, the guide surface can be It is possible to prevent or suppress the base end portion of the cutting edge 32 spaced apart from 6a in the second direction X2 from biting into the burr removal target surface 50a. Therefore, it is possible to prevent or suppress the deburring tool 1A from damaging the deburring target surface 50a during the deburring process.

DESCRIPTION OF SYMBOLS 1, 1A, 1B... Deburring tool 2... Shaft part 5a... Front end surface 5b... Curved outer peripheral surface 6... Guide part 6a... Guide surface 7... Cutting edge forming part 8... Columnar part 8a... Annular outer peripheral surface 9 Shank portion 11 Outer peripheral surface 12 Groove 13 First inner wall surface 14 Second inner wall surface 17 Bottom surface 20 Opening edge 21 First opening edge portion 22... Second opening edge portion 23... Third opening edge portion 24... Fourth opening edge portion 25... First cutting edge 26... Second cutting edge 30... Blade portion 30a... Rake face 30b... Flank face 30c... Edge of flank face 31... Concave portion 32... Cutting edge 50... Workpiece 50a... Surface to be deburred 51... Radial floating holder 52... Machine tool 52a... Spindle 55... Burr, DESCRIPTION OF SYMBOLS 60... Gear 61... Cylindrical part 62... Tooth part 62a... First tapered surface 62b... Second tapered surface 65... Burr 100... Deburring tool 101... Shaft part 102... Peripheral surface 104... Groove 105 Cutting edge 110a Deburring target surface L/L1 Axis line V Virtual cylinder F Reaction force R1 First rotation direction R2 Second rotation direction

Claims (9)

having a columnar shaft,
Assuming that one side of the axial direction is the front side and the other side is the rear side in the direction along the axis of the shaft, the shaft includes a guide portion having an annular guide surface around the axis, and a guide surface extending from the guide surface. a cutting edge forming portion including the cutting edge extending rearward,
The cutting edge forming portion includes an outer peripheral surface that continues to the rear of the guide surface and a groove provided on the outer peripheral surface ,
The groove extends rearward from the guide surface, has the deepest depth at the center portion in the axial direction, becomes shallower toward the front from the center portion, and becomes shallower toward the rear from the center portion. ,
In the opening edge of the groove in the cutting edge forming portion, the opening edge portion extending rearward from the guide surface is a cutting edge,
A deburring tool, wherein the cutting edge forming portion entirely overlaps with the guide portion when viewed from the axial direction. The groove includes a first inner wall surface and a second inner wall surface facing each other in a circumferential direction around the axis, and an end of the first inner wall surface extending in the circumferential direction and an inner circumference of the second inner wall surface. a bottom surface connecting the side edges,
2. The burr according to claim 1 , wherein the opening edge portion is a corner portion where the first inner wall surface and the outer peripheral surface intersect, and a corner portion where the second inner wall surface and the outer peripheral surface intersect. picking tool. The groove extends parallel to the axis in the axial direction with a constant width,
3. The deburring tool according to claim 2 , wherein the first inner wall surface and the second inner wall surface each extend radially about the axis. 2. The deburring tool according to claim 1 , wherein the outer diameter dimension of said cutting edge forming portion is constant in said axial direction. 2. The deburring tool according to claim 1 , wherein the outer diameter dimension of said cutting edge forming portion decreases toward said rear. 2. The deburring tool according to claim 1, wherein the shaft portion has a front end portion provided with an annular curved outer peripheral surface that curves inwardly toward the front from the guide surface. 2. The deburring tool according to claim 1, wherein said shaft portion has a cylindrical portion having the same outer diameter as said guide portion behind said cutting edge forming portion. A rake face of the cutting edge extending radially inward from the cutting edge extends radially,
2. The deburring tool according to claim 1, wherein a flank of the cutting edge extending circumferentially from the cutting edge extends inside the guide surface when viewed in the axial direction. Attaching the rear end portion of the shaft portion of the deburring tool according to claim 1 to a machine tool via a radial floating holder,
With the radial floating holder and the deburring tool rotated about the axis, the guide portion and the cutting edge forming portion are brought into contact with the deburring target surface of the work and moved along the deburring target surface. A deburring method, characterized by deburring a surface to be deburred.

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