Deburring tool and deburring method

Abstract

The deburring tool (1) is provided with a cylindrical shaft part (2). When the front end side of the shaft part (2) is set as a first direction (X1) and the base end side of the shaft part (2) is set as a second direction (X2), the shaft part (2) is provided with: a guide part (6) having an annular guide surface (6a); and a cutting edge-forming section (7) having an outer peripheral surface (11) continuous with the second direction (X2) of the guide surface (6a). The cutting edge forming section (7) includes, on the outer peripheral surface (11), a groove (12) extending from the guide surface (6a) in the second direction (X2). In the opening edge (20) of the groove (12) of the cutting edge forming part (7), the portion of the opening edge (20) extending in the second direction (X2) from the guide surface (6a) is a cutting edge (25), (26). In the deburring process, while the deburring tool (1) is rotated, the guide surface (6a) and the cutting edge forming part (7) are brought into contact with the surface (50a) to be deburred.

Description

Technical Field

[0001] The present invention relates to a rod-shaped deburring tool which removes burrs by bringing the outer peripheral surface into contact with a surface of a workpiece to be deburred. Background Art

[0002] Such a deburring tool is described in Patent Document 1. The deburring tool of the document includes: an outer peripheral surface surrounding an axis; a front end surface perpendicular to the axis; and a groove of constant width that crosses the center of the front end surface in a direction orthogonal to the axis. The groove extends from the front end surface of the deburring tool toward the base end side in parallel with the axis. The front end portion of the deburring tool is divided into two blade portions by the groove. The opening edge of the groove includes a top edge portion continuous with the front end surface and an outer peripheral end edge portion continuous with the outer peripheral surface. The outer peripheral end edge portion extends from the front end surface in the axial direction. The outer peripheral end edge portion is the cutting edge of the deburring tool.

[0003] When removing burrs, the deburring tool is placed in a posture where its axis is parallel to the burr removal target surface of the workpiece. In addition, the outer peripheral surface of the shaft portion is brought into contact with the burr removal target surface of the workpiece while the deburring tool is rotated around the axis, and the tool moves along the burr removal target surface. As a result, burrs existing on the edge of the burr removal target surface are sheared off by the cutting edge. Prior art literature Patent Literature

[0004] Patent Document 1: Japanese Patent Application Publication No. 2016-2618 Summary of the invention Technical problem to be solved by the invention

[0005] The deburring tool of Patent Document 1 has a problem that the cutting edge bites the surface to be deburred during deburring and easily damages the surface of the workpiece. Fig.14 , Fig.15 Describe the problem. Fig.14 This is a perspective view of the deburring tool disclosed in Patent Document 1. Fig.15 This is an explanatory diagram of a deburring operation performed by the deburring tool of Patent Document 1, as viewed from the front end surface side of the deburring tool. Fig.15 (a) shows a state where the outer peripheral surface of the deburring tool is in contact with the surface to be deburred. Fig.15 (b) shows a state where the groove of the deburring tool faces the surface to be deburred. Fig.15 (c) indicates that the deburring tool is Fig.15 The state of (b) is further rotated.

[0006] like Fig.14As shown, 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 of constant width that crosses 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 base end side in parallel with the axis L0. The opening edge of the groove 104 includes a top edge portion 104a continuous with the front end portion 103 and an outer peripheral end edge portion 104b continuous with the outer peripheral surface 102. The outer peripheral end edge portion 104b extends from the front end portion 103 in the direction of the axis L0. The outer peripheral end edge portion 104b 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 front cutting edge of the cutting edge 105. The 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 an acute angle.

[0007] like Fig.15 As shown in FIG. 1 , when removing burrs, the deburring tool 100 is placed so that its axis L0 is parallel to the burr removal target surface 110a of the workpiece 110. Fig.15 As shown in (a), while the deburring tool 100 is rotated about the axis, the outer peripheral surface 102 of the shaft portion 101 is pressed against the burr removal target surface 110a of the workpiece 110 and moves along the burr removal target surface 110a.

[0008] Afterwards, if Fig.15 As shown in (b), at the rotation angle position where the groove 104 of the rotating deburring tool 100 is relative to the burr removal target surface 110a, in the relative direction between the deburring tool 100 and the burr removal target surface 110a, there is no arc-shaped outer peripheral surface 102 between the deburring tool 100 and the burr removal target surface 110a.

[0009] Here, the deburring tool 100 is always pressed against the burr removal target surface 110a during the processing operation. Fig.15 The state shown in (a) is transferred to Fig.15 In the state shown in (b), the shaft 101 approaches the burr removal target surface 110a by such an amount that the outer peripheral surface 102 does not exist between the deburring tool 100 and the burr removal target surface 110a. That is, the shaft 101 approaches the burr removal target surface 110a, and the burr removal target surface 110a is located inside the outer peripheral surface 102 of the shaft 101. Therefore, Fig.15 As shown in (c) of FIG. 1 , when the deburring tool 100 further rotates, the opening edge of the groove 104 provided on the outer peripheral surface 102 , that is, the cutting edge 105 cuts the burr removal target surface 110 a .

[0010] 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 a burr removal target surface of a workpiece during a deburring operation. Technical solutions adopted to solve technical problems

[0011] In order to solve the above-mentioned problem, the deburring tool of the present invention is characterized in that it has a cylindrical shaft portion, and when one side of the axial direction in the direction along the axis of the shaft portion is set as the front and the other side is set as the rear, the shaft portion includes: a guide portion, which has an annular guide surface around the axis; and a cutting edge forming portion, which includes a cutting edge extending from the guide surface to the rear, the cutting edge forming portion includes an outer peripheral surface continuous with the rear of the guide surface and a groove arranged on the outer peripheral surface, the groove extending from the guide surface to the rear, the depth of the central part in the axial direction is the deepest, it becomes shallower from the central part toward the front, and becomes shallower from the central part toward the rear, in the opening edge of the groove of the cutting edge forming portion, the opening edge portion extending from the guide surface to the rear is the cutting edge, and when viewed from the axial direction, the cutting edge forming portion as a whole overlaps with the guide portion.

[0012] According to the present invention, the shaft portion includes a guide portion having an annular outer peripheral surface on the front side of a cutting edge forming portion provided with a cutting edge. In addition, when the cutting edge forming portion is observed from the axial direction, the entirety overlaps with the guide portion. That is, the cutting edge forming portion does not have a portion protruding from the guide surface toward the outer peripheral side. Therefore, when the rotating shaft portion is brought into contact with the burr removal target surface of the workpiece to remove burrs, if the guide portion is brought into contact with the burr removal target surface, it is possible to prevent or suppress the burr removal target surface from being located at a position closer to the inner peripheral side than the guide surface. Therefore, it is possible to prevent or suppress the cutting edge provided in the cutting edge forming portion from cutting the burr removal target surface.

[0013] In addition, in the present invention, the cutting edge forming portion including the cutting edge includes an outer peripheral surface that is continuous with the rear of the guide surface, so it is easier to suppress the cutting edge from cutting the burr removal target surface. Furthermore, in the present invention, the depth of the central portion of the groove in the axial direction is the deepest, and becomes shallower from the central portion toward the front end side, and becomes shallower from the central portion toward the second direction. Therefore, the burrs cut off by the cutting edge are easily discharged from the groove to the outside.

[0014] In the present invention, the groove may include: a first inner wall surface and a second inner wall surface, the first inner wall surface and the second inner wall surface are opposite to each other in the circumferential direction around the axis; and a bottom surface extending along the circumferential direction and connecting the inner circumferential end of the first inner wall surface and the inner circumferential end of the second inner wall surface, and the opening edge portion is a corner where the first inner wall surface intersects with the outer circumferential surface and a corner where the second inner wall surface intersects with the outer circumferential surface. In this way, the deburring operation can be performed regardless of the rotation direction of the deburring tool.

[0015] In the present invention, the groove may extend along the axial direction with a constant width, and the first inner wall surface and the second inner wall surface may extend along radial directions centered on the axis.

[0016] However, the tooth portion of the helical gear is formed by hobing or skiving. In these cutting processes, larger burrs are generated compared to general cutting processes. Here, if the burr becomes larger, the strength of the base portion of the burr becomes higher. Therefore, when removing the burrs generated on the helical gear, a load is applied to the cutting edge of the deburring tool. Therefore, when the cutting edge is an acute angle, the cutting edge is prone to chipping. In contrast, if the first inner wall surface and the second inner wall surface of the groove that become the front cutting edge of the cutting edge extend radially respectively, each cutting edge becomes a right angle. That is, the angle formed by the outer peripheral surface of the cutting edge forming portion and the front cutting edge of one side, that is, the first inner wall surface, is 90°. In addition, the angle formed by the outer peripheral surface of the cutting edge forming portion and the front cutting edge of the other side, that is, the second inner wall surface, is 90°. Therefore, even when the deburring tool is used to remove high-strength burrs such as burrs generated on the helical gear, it is possible to prevent or suppress the chipping of the cutting edge.

[0017] In the present invention, the cutting edge forming portion may have a constant outer diameter in the axial direction.

[0018] In the present invention, the outer diameter of the cutting edge forming portion may decrease toward the second direction. In this way, when the rear end side of the shaft portion is tilted toward the burr removal target surface during deburring, it is possible to prevent or suppress the rear end side portion of the cutting edge from damaging the burr removal target surface.

[0019] The end of the shaft portion in the first direction may include a front end portion, and the front end portion includes an annular curved outer peripheral surface that curves inward from the guide surface toward the first direction. If such a front end portion is included, it is possible to prevent or suppress the burr removal target surface from being damaged by the front end of the shaft portion when the shaft portion is tilted relative to the burr removal target surface during deburring.

[0020] In the present invention, the shaft portion includes a cylindrical portion having the same outer diameter as the guide portion in the second direction of the cutting edge forming portion. In this case, if the deburring operation is performed in a state where the guide portion and the cylindrical portion are in contact with the burr removal target surface, the base end side of the shaft portion can be prevented from tilting in a direction approaching the burr removal target surface during the deburring process. Therefore, it is possible to prevent or suppress the burr removal target surface from being damaged by the base end side portion of the cutting edge.

[0021] In the present invention, the rake face of the cutting edge extending from the cutting edge to the inner circumference side may extend radially, and the flank face of the cutting edge extending from the cutting edge to the circumference side may extend inside the guide surface when viewed from the axial direction. In this way, an acute-angled cutting edge may be included.

[0022] Next, the burr removal method of the present invention is characterized in that the rear end portion of the shaft portion of the above-mentioned deburring tool is installed on a machine tool via a radial floating retainer, and when the radial floating retainer and the deburring tool are rotated around the axis, the guide portion and the cutting edge forming portion are brought into contact with the burr removal target surface of the workpiece and move along the burr removal target surface, thereby removing burrs from the burr removal target surface.

[0023] If the deburring tool is mounted on a machine tool via a radial floating holder and a deburring operation is performed, when the hardness of the burr rising from the burr removal target surface is high and the burr cannot be cut off by the cutting edge, the shaft portion moves in an orthogonal direction to the axis under the action of a force acting on the cutting edge forming portion from one side of the burr. That is, when the burr cannot be cut off, the cutting edge forming portion including the cutting edge moves in a direction away from the burr removal target surface. Therefore, in the deburring process, it is possible to prevent or suppress the cutting edge from biting the burr and the burr removal target surface and damaging the burr removal target surface. In addition, it is possible to prevent or suppress the chipping of the cutting edge during the deburring process due to the presence of burrs with high hardness. Effects of the Invention

[0024] 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 burr removal target surface of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a stereoscopic view of the deburring tool of the first embodiment. Figure 2 is a side view of the deburring tool of the first embodiment. Figure 3 yes Figure 2 AA line section view. Figure 4 yes Figure 2 BB line cross-sectional view. Figure 5 This is a diagram to explain the deburring method using a deburring tool. Figure 6 It is a flow chart of the deburring method. Figure 7 This is an explanatory diagram of a deburring operation for removing burrs from a bevel gear. Figure 8 It is an explanatory diagram of a deburring tool according to a modified example. Fig. 9 It is an explanatory diagram of a deburring method using a deburring tool according to a modified example. Fig.10 It is a stereoscopic view of the deburring tool of the second embodiment. Fig.11 It is a side view of the deburring tool of the second embodiment. Fig.12 yes Fig.11 CC line section view. Fig.13 yes Fig.11 DD line cross-sectional view. Fig.14 It is a stereogram of an existing deburring tool. Fig.15 This is an explanatory diagram of the deburring operation performed by a conventional deburring tool. DETAILED DESCRIPTION

[0026] Hereinafter, a deburring tool and a deburring method according to an embodiment of the present invention will be described with reference to the drawings.

[0027] Figure 1 This is a three-dimensional image of a deburring tool. Figure 1 In the figure, the deburring tool is viewed from the front. Figure 2 is a side view of a deburring tool. Figure 3 yes Figure 1 AA line section view. Figure 3 In the figure, the deburring tool is cut along the axis. Figure 4 yes Figure 1 BB line cross-sectional view. Figure 4 In the figure, the cutting edge forming part of the deburring tool is cut along a direction perpendicular to the axis. Figure 1 As shown, the deburring tool 1 of this example has a cylindrical shaft 2. The shaft 2 is made of super-hard alloy or high-speed tool steel (HSS). In the following description, the direction along the axis L of the shaft 2 is set as the axis direction X, the front side of the shaft 2 in the axis direction X is set as the first direction X1, and the side (rear side) opposite to the first direction X1 in the axis direction X is set as the second direction X2. The second direction X2 is the base end side of the shaft 2.

[0028] like Figures 1 to 3 As shown, 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 portion 9 in sequence from the end portion in the first direction X1 toward the second direction X2. The front end portion 5 includes a circular front end surface 5a and an annular curved outer peripheral surface 5b that curves from the front end surface 5a toward the outer peripheral side toward the second direction X2.

[0029] The guide portion 6 includes a circular annular guide surface 6a around the axis. The width of the guide surface 6a in the axial direction X is constant in the circumferential direction. The curved outer peripheral surface 5b of the front end portion 5 is continuous with the end of the guide surface 6a in the first direction X1 without a step difference. In other words, the front end portion 5 includes an annular curved outer peripheral surface 5b that curves toward the inner circumference from the guide surface 6a of the guide portion 6 toward the first direction X1.

[0030] When viewed from the axial direction X, the cutting edge forming portion 7 entirely overlaps with the guide portion 6. Figure 4 As shown, when viewed from the axial direction X, the cutting edge forming portion 7 does not include a portion protruding further toward the outer peripheral side than the guide surface 6a. The cutting edge forming portion 7 includes an outer peripheral surface 11 continuous with the second direction X2 of the guide surface 6a. In addition, the cutting edge forming portion 7 includes a plurality of grooves 12 extending from the guide portion 6 to the second direction X2 on its outer peripheral surface 11. The outer peripheral surface 11 is an arc surface centered on the axis L. In this example, the cutting edge forming portion 7 includes six grooves 12. Each groove 12 extends along the axial direction X with a constant width.

[0031] like Figure 2 As shown, when viewed from the radial direction, each groove 12 is a long rectangle in the axial direction X. Each groove 12 includes a first inner wall surface 13 and a second inner wall surface 14 that are opposite to each other in the circumferential direction around the axis. In addition, each groove 12 includes a bottom surface 17 that is a long rectangle in the axial direction X when viewed from the radial direction. The bottom surface 17 extends in the circumferential direction, connecting the end of the inner circumference side of the first inner wall surface 13 and the end of the inner circumference side of the second inner wall surface 14.

[0032] Here, if Figure 3 As shown, the depth of the central portion of each groove 12 in the axial direction X is the deepest, and becomes shallower from the central portion toward the first direction X1, and becomes shallower from the central portion toward the second direction X2. 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 is at the same height as the guide surface 6a. In addition, 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 is at the same height as the annular outer peripheral surface 8a of the cylindrical portion 8. The cross-sectional shape of the bottom surface 17 of the groove 12 is an arc whose central portion in the axial direction X is concave toward the inner peripheral side.

[0033] like Figure 2As shown, 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 includes a first opening edge portion 21 and a second opening edge portion 22 that are opposite to each other in the circumferential direction. In addition, the opening edge 20 includes: a third opening edge portion 23 that connects 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 a fourth opening edge portion 24 that connects the end of the first 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 extend from the guide surface 6a to the second direction X2, respectively.

[0034] In the opening edge 20 of each groove 12 of the cutting edge forming portion 7, the first opening edge portion 21 extending from the guide surface 6a to the second direction X2 is the first cutting edge 25. In addition, in the opening edge 20 of each groove 12, the second opening edge portion 22 extending from the guide surface 6a to the second direction X2 is the second cutting edge 26. Here, the first opening edge portion 21 is the end portion of the outer peripheral side of the first inner wall surface 13, and the second opening edge portion 22 is the end portion of the outer peripheral side of the second inner wall surface 14. Therefore, the first cutting edge 25 is the corner portion where the first inner wall surface 13 intersects with the outer peripheral surface 11 of the cutting edge forming portion 7. The second cutting edge 26 is the corner portion where the second inner wall surface 14 intersects with the outer peripheral surface 11 of the cutting edge forming portion 7. In addition, the first inner wall surface 13 continuous with the inner peripheral side of the first opening edge portion 21 is the first rake face of the first cutting edge 25. The second inner wall surface 14 continuous with the inner peripheral side of the second opening edge portion 22 is the second rake face of the second cutting edge 26.

[0035] like Figure 4 As shown, the first inner wall surface 13 and the second inner wall surface 14 of each groove 12 extend radially with the axis L as the center. That is, the front cutting surface (first inner wall surface 13) of the first cutting edge 25 extends radially. On the other hand, the back cutting surface of the first cutting edge 25 is the outer peripheral surface 11 of the shaft portion 2. Therefore, the back angle of the first cutting edge 25 is 0°. Therefore, the first angle θ1 formed by the outer peripheral surface 11 (back cutting surface) of the cutting edge forming portion 7 and the front cutting surface of the first cutting edge 25 is 90°. That is, the first cutting edge 25 is a right angle. In addition, the second inner wall surface 14, which is the front cutting surface of the second cutting edge 26, extends radially. On the other hand, the back cutting surface of the first cutting edge 25 is the outer peripheral surface 11 of the shaft portion 2, and the back 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 front cutting surface of the second cutting edge 26, is 90°. That is, the second cutting edge 26 is a right angle.

[0036] like Figure 1As shown, the cylindrical portion 8 includes 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 width of the annular outer peripheral surface 8a in the axial direction X is constant 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. In addition, the outer diameter dimension of the cutting edge forming portion 7 is constant in the axial direction X. Therefore, the outer peripheral surface 11 of the cutting edge forming portion 7 is continuous with the guide surface 6a of the guide portion 6 without any step difference. In addition, the outer peripheral surface 11 of the cutting edge forming portion 7 is continuous with the annular outer peripheral surface 8a of the cylindrical portion 8 without any step difference.

[0037] The shank 9 is a portion located closer to the second direction X2 than the cylindrical portion 8. The shank 9 is a portion clamped by the spindle of the machine tool. In this example, the shank 9 is cylindrical. In addition, the outer diameter of the shank 9 is the same as that of the cylindrical portion 8, and there is no boundary between the cylindrical portion 8 and the shank 9. In addition, a D-shaped cut or the like is sometimes applied to the shank 9.

[0038] (Deburring method) Figure 5 This is an explanatory diagram of a deburring method implemented by the deburring tool 1 . Figure 6 is a flow chart of a deburring method implemented by a deburring tool 1. Figure 5 In the example shown, the workpiece 50 is a helical gear. The burr removal target surface 50a of the workpiece 50 is the end surface of the tooth portion of the helical gear and the portion of the end surface of the helical gear adjacent to the inner circumference of the tooth portion. Figure 5 In the example shown, burrs 55 generated on the edge of the end face of the tooth portion of the helical gear are removed by the deburring tool 1 .

[0039] like Figure 5 , Figure 6 As shown, when deburring a workpiece 50, the deburring tool 1 is mounted on the spindle 52a of the machine tool 52 via the radial floating holder 51 (step ST1). Then, while the machine tool 52 is driven to rotate the deburring tool 1 in the first rotation direction R1 around the axis, the guide surface 6a and the outer peripheral surface 11 of the cutting edge forming portion 7 are brought into contact with the burr removal target surface 50a of the workpiece 50, and move along the burr removal target surface 50a (step ST2). As a result, the deburring tool 1 cuts off the burrs 55 existing on the edge of the burr removal target surface 50a. The cutting edge used when the deburring tool 1 rotates in the first rotation direction R1 is the first cutting edge 25.

[0040] In this example, the annular outer peripheral surface 8a of the cylindrical portion 8 does not contact the burr removal target surface 50a. In addition, during the deburring process, the curved outer peripheral surface 5b of the front end portion 5 does not contact the burr removal target surface 50a. In addition, the rotation direction of the deburring tool 1 can also be the opposite direction to the first rotation direction R1. In this case, the cutting edge that cuts off the burr 55 becomes the second cutting edge 26.

[0041] Here, the radial floating retainer 51 is a common structure. The radial floating retainer 51 retains the deburring tool 1 so that it can move forward and backward in the orthogonal direction orthogonal to the axis L thereof. In addition, during the deburring process, when the guide surface 6a and the outer peripheral surface 11 of the cutting edge forming portion 7 are in contact with the burr removal target surface 50a of the workpiece 50, the radial floating retainer 51 generates an applied force corresponding to the force (reaction force) received by the deburring tool 1 from the workpiece 50, so that the deburring tool 1 is in contact with the burr removal target surface 50a.

[0042] (Effect) According to this example, the shaft portion 2 of the deburring tool 1 includes a guide portion 6 having an annular outer peripheral surface 11 on the front end side of the cutting edge forming portion 7 provided with the first cutting edge 25 and the second cutting edge 26. In addition, the cutting edge forming portion 7 is entirely overlapped with the guide portion 6 when viewed from the axial direction X. That is, the cutting edge forming portion 7 does not have a portion protruding from the guide surface 6a to the outer peripheral side. Therefore, when the outer peripheral surface 11 of the rotating shaft portion 2 is brought into contact with the burr removal target surface 50a of the workpiece 50 to remove the burr 55, if the guide portion 6 is brought into contact with the burr removal target surface 50a, it is possible to prevent or suppress the burr removal target surface 50a from being located at a position closer to the inner peripheral side than the guide surface 6a. Therefore, it is possible to prevent or suppress the cutting edges 25 and 26 from cutting the burr removal target surface 50a.

[0043] That is, in the existing deburring tool 100 in which the deburring tool 1 does not include the guide portion 6, as Fig.15 As shown in (b), at the rotation angle position of the groove 12 of the deburring tool 100 relative to the burr removal target surface 50a, the shaft portion 101 is close to the burr removal target surface 110a, and the burr removal target surface 110a is located at a position inside the outer peripheral surface 102 of the shaft portion 101. Fig.15 As shown in (c), when the deburring tool 100 is further rotated, the opening edge of the groove 104 provided on the outer peripheral surface 102, that is, the cutting edge 105, sometimes cuts the burr removal target surface 110a. In contrast, when the deburring tool 1 of this example is used, the occurrence of this situation can be prevented or suppressed.

[0044] In this example, the cutting edge forming portion 7 including the cutting edges 25 and 26 includes the outer peripheral surface 11 that is continuous with the rear of the guide surface 6a. Therefore, it is easier to suppress the cutting edges 25 and 26 from cutting the burr removal target surface.

[0045] Next, the teeth of the helical gear are formed by hobbing or scraping. In these cutting processes, larger burrs 55 are generated compared to general cutting processes. Here, if the burrs 55 become larger, the strength of the base portion of the burrs becomes higher. Therefore, when removing the burrs 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 are acute angles, there is a problem that the cutting edges 25 and 26 are easily chipped.

[0046] In contrast, in this example, the first inner wall surface 13 and the second inner wall surface 14 of the groove 12, which are the rake surfaces of the cutting edges 25 and 26, extend radially. Thus, the first cutting edge 25 and the second cutting edge 26 are at right angles. Therefore, the deburring tool 1 of this example is more convenient than the deburring tool 1 of the embodiment. Fig.14 Compared with the deburring tool 100 in which the cutting edge 105 shown is an acute angle, chipping of the cutting edges 25 and 26 during the deburring process can be prevented or suppressed.

[0047] In addition, in this example, the deburring tool 1 is mounted on a machine tool via a radial floating holder 51 to perform a deburring operation. Therefore, when the hardness of the burr 55 existing on the burr removal target surface 50a is high and the burr 55 cannot be cut off by the cutting edges 25 and 26, the shaft portion 2 moves in a direction orthogonal to the axis L under the action of a force acting on the cutting edge forming portion 7 from the side of the burr 55. That is, when the burr 55 cannot be cut off, the cutting edge forming portion 7 including the cutting edges 25 and 26 moves in a direction away from the burr removal target surface 50a. Therefore, during the deburring process, it is possible to prevent or suppress the cutting edges 25 and 26 from biting the burr 55 and the burr removal target surface 50a and damaging the burr removal target surface 50a. In addition, it is possible to prevent or suppress the cutting edges 25 and 26 from chipping during the deburring process due to the presence of the burr 55 with high hardness.

[0048] The depth of the groove 12 is deepest at the center portion in the axial direction X, and becomes shallower from the center portion toward the front end side and from the center portion toward the second direction X2. Therefore, the burrs 55 cut by the cutting edges 25 and 26 are easily discharged from the groove 12.

[0049] In addition, the end of the shaft portion 2 in the first direction X1 includes a front end portion 5, and the front end portion 5 includes an annular curved outer peripheral surface 5b that curves inward from the guide surface 6a toward the first direction X1. Therefore, during the deburring process, it is possible to prevent or suppress the burr removal target surface 50a from being damaged by the front end of the shaft portion 2 when the shaft portion 2 is inclined relative to the burr removal target surface 50a.

[0050] In this example, the groove 12 includes a first inner wall surface 13 and a second inner wall surface 14 that are opposite to each other in the circumferential direction around the axis L. The end portion of the outer peripheral side of the first inner wall surface 13 is a first cutting edge 25, and the end portion of the outer peripheral side of the second inner wall surface 14 is a second cutting edge 26. Therefore, deburring can be performed regardless of the rotation direction of the deburring tool 1.

[0051] 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 burrs 55 generated at the edges of the deburring target surface 50a can be removed while suppressing damage to the deburring target surface 50a. Figure 7 This is an explanatory diagram of a deburring operation for removing burrs generated on the end surface of the tooth portion of a bevel gear.

[0052] like Figure 7 As shown, the bevel gear 60 includes a cylindrical portion 61 and an umbrella-shaped tooth portion 62, which is arranged on one side along the center line direction of the center line M of the cylindrical portion 61. The tooth portion 62 protrudes from the cylindrical portion 61 to the outer peripheral side. The tooth portion 62 includes an annular first tapered surface 62a continuous with the outer peripheral surface of the cylindrical portion 61 on one side of the cylindrical portion 61. The first tapered surface 62a is inclined toward the inner peripheral side and toward the cylindrical portion 61. In addition, the tooth portion 62 includes an annular second tapered surface 62b on the opposite side to the cylindrical portion 61. The second tapered surface 62b is inclined toward the inner peripheral side and toward the cylindrical portion 61.

[0053] Here, when the teeth are formed on the tooth portion 62 by cutting, burrs 65 are generated at the edge of the first tapered surface 62a and the edge of the second tapered surface 62b. When the burrs 65 generated at the edge of the first tapered surface 62a are removed, as shown in FIG. Figure 7 As shown by the solid line in (b), the guide surface 6a and the cutting edge forming portion 7 of the rotating deburring tool 1 are brought into contact with the first tapered surface 62a, while the deburring tool 1 and the bevel gear 60 are relatively moved around the center line of the cylindrical portion 61. In addition, when removing the burr 65 generated on the edge of the second tapered surface 62b, as shown in FIG. Figure 7As shown by the dotted line in (b), the guide surface 6a and the cutting edge forming portion 7 of the rotating deburring tool 1 are brought into contact with the second tapered surface 62b, while the deburring tool 1 and the bevel gear 60 are relatively moved around the center line of the cylindrical portion 61. In this way, even if the burr removal target surface 50a is a tapered surface, the burr 65 generated on the edge of the burr removal target surface 50a can be removed without damaging the burr removal target surface 50a.

[0054] (Other deburring methods) Here, the shaft portion 2 of the deburring tool 1 of this example includes a cylindrical portion 8 having the same outer diameter as the guide portion 6 in the second direction X2 of the cutting edge forming portion 7. Therefore, in the case of removing burrs formed at the opening edge of the hole formed on the burr removal target surface 50a, the deburring tool 1 can be moved to remove the burrs 55 in the deburring process while the guide surface 6a of the guide portion 6 and the annular outer peripheral surface 8a of the cylindrical portion 8 are in contact with the burr removal target surface 50a. That is, the annular outer peripheral surface 8a of the cylindrical portion 8 can be used as a second guide surface to contact the burr removal target surface 50a to perform deburring. In this case, since there are annular surfaces (guide surface 6a and annular outer peripheral surface 8a) having the same outer diameter as the cutting edge forming portion 7 on both sides in the axial direction X of the cutting edge forming portion 7, it is possible to prevent the shaft portion 2 from tilting in the direction away from the burr removal target surface 50a during the deburring process. Therefore, the cutting edges 25 and 26 do not bite the burr removal target surface 50a. Therefore, it is possible to prevent or suppress the deburring tool 1 from damaging the burr removal target surface 50a.

[0055] (Variation Example) Figure 8 FIG. 1 is a side view of a modified example of a deburring tool. Figure 8 In FIG. 1 , the shape of the cutting edge forming portion 7 is shown in an exaggerated manner. Fig. 9 is used Figure 8 The outer diameter of the cutting edge forming portion 7 of the deburring tool 1A of this example decreases toward the second direction X2, and the other structures are the same as those of the above-mentioned deburring tool 1. Therefore, the same symbols are given to corresponding parts and their detailed description is omitted.

[0056] In the deburring tool 1A of this example, the outer diameter dimension of the cutting edge forming portion 7 decreases toward the second direction X2. That is, the cutting edge forming portion 7 includes a tapered outer peripheral surface 11 whose outer diameter dimension decreases from the guide surface 6a toward the second direction X2. A plurality of grooves 12 extending along the axial direction X with a constant width are provided on the outer peripheral surface 11. In the opening edge 20 of the groove 12 of the cutting edge forming portion 7, the first opening edge portion 21 and the second opening edge portion 22 extending toward the second direction X2 are cutting edges 25 and 26, respectively. Here, the inclination of the outer peripheral surface 11 is very small. In this example, the end portion (the boundary with the guide portion 6) of the cutting edge forming portion 7 in the first direction X1 has the same diameter as the guide surface 6a, but the diameter of the end portion of the cutting edge forming portion 7 in the second direction X2 is 1 mm shorter than the diameter of the guide surface 6a.

[0057] The shape of the cutting edge forming portion 7 of the deburring tool 1A is a shape used to cope with the inclination of the deburring tool 1A generated during the deburring process. That is, when the shank 9 (the rear end portion of the shaft 2) of the deburring tool 1A is mounted on the spindle 52a of the machine tool 52 via the radial floating retainer 51 to perform the deburring process, the guide portion 6 and the cutting edge forming portion 7 of the deburring tool 1A are pressed against the burr removal target surface 50a of the workpiece 50. Therefore, during the deburring process, under the action of the reaction force F applied to the guide portion 6 and the cutting edge forming portion 7 from the burr removal target surface 50a, the radial floating retainer 51 may be unable to maintain the axis L of the deburring tool 1A in a state parallel to the burr removal target surface 50a. In this case, if Fig. 9 As shown, the axis L of the deburring tool 1A is inclined relative to the rotation axis N of the spindle 52a of the machine tool 52, and the second direction X2 side of the deburring tool 1A connected to the radial floating holder 51 is close to the burr removal target surface 50a.

[0058] 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 the burr removal target surface 50a, thereby damaging the burr removal target surface 50a.

[0059] To solve such a problem, the outer diameter of the cutting edge forming portion 7 decreases toward the second direction X2. Therefore, even when the deburring tool 1A is tilted, the base end side portions of the cutting edges 25 and 26 that are separated from the guide surface 6a in the second direction X2 from the guide surface 6a can be prevented or suppressed from biting the burr removal target surface 50a. Therefore, the deburring tool 1A can be prevented or suppressed from damaging the burr removal target surface 50a during the deburring process.

[0060] (Other methods) The number of grooves 12 provided in the cutting edge forming portion 7 is not limited to six. In addition, each groove 12 may also be widened in the second direction X2. At this time, the first cutting edge 25 and the second cutting edge 26 are inclined in the direction of separation from each other toward the second direction X2. In addition, each groove 12 may also be widened in the first direction X1. At this time, the first cutting edge 25 and the second cutting edge 26 are inclined in the direction of separation from each other toward the first direction X1. In addition, each groove 12 may also be inclined toward one side of the circumferential direction from the guide surface 6a toward the second direction X2.

[0061] (Example 2) Fig.10 It is a stereoscopic view of the deburring tool of the second embodiment. Fig.11 It is a side view of the deburring tool of the second embodiment. Fig.12 yes Fig.11 CC line section view. Fig.13 yes Fig.11 DD line cross-sectional view. Fig.10 In FIG. 1 , the deburring tool 1B of this example is viewed from the front side. Fig.12 In FIG. 1 , the deburring tool 1B is cut along the axis L1. Fig.13 , the cutting edge forming portion 7 of the deburring tool 1B is cut along a direction perpendicular to the axis L1. The deburring tool 1B of the second embodiment includes structures corresponding to the above-mentioned deburring tool 1, so the corresponding structures are denoted by the same reference numerals and their detailed description is omitted.

[0062] like Fig.10 As shown, the deburring tool 1B of this example has a cylindrical shaft portion 2. 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 portion 9 in order from the end portion in the first direction X1 toward the second direction X2. The front end portion 5 includes a circular front end face 5a and an annular curved outer peripheral surface 5b that bends from the front end face 5a toward the outer peripheral side toward the second direction X2. The guide portion 6 includes an annular guide surface 6a around the axis L1. The width of the guide surface 6a in the axial direction X is constant in the circumferential direction. The front end portion 5 includes an annular curved outer peripheral surface 5b that bends from the guide surface 6a of the guide portion 6 toward the first direction X1 and toward the inner peripheral side.

[0063] The cylindrical portion 8 includes an annular outer peripheral surface 8a. The outer diameter of the annular outer peripheral surface 8a is the same as the outer diameter of the guide surface 6a. The width of the annular outer peripheral surface 8a in the axial direction X is constant in the circumferential direction. The shank 9 is a portion located closer to the second direction X2 than the cylindrical portion 8.

[0064] 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. Fig.13 As shown in FIG. 1 , the cutting edge forming portion 7 overlaps the guide portion 6 as a whole when viewed from the axial direction X. Fig.13 As shown, the cutting edge forming portion 7 does not include a portion that protrudes further toward the outer peripheral side than the guide surface 6a when viewed from the axial direction X. Fig.10 , Fig.13 As shown, the cutting edge forming portion 7 includes four blade portions 30 arranged at equal angles around the axis L1. In addition, the cutting edge forming portion 7 includes four recessed portions 31 recessed toward the inner circumference between the blade portions 30 in the circumferential direction. Fig.10 , Fig.11 As shown, each blade portion 30 includes a cutting edge 32 extending from the guide surface 6a in the second direction X2 on one side in the circumferential direction. Therefore, the cutting edge forming portion 7 includes four cutting edges 32 arranged at equal angular intervals around the axis L1.

[0065] Each cutting edge 32 extends from the guide surface 6a toward the second direction X2 and parallel to the axis L1. Here, each cutting edge 32 overlaps with the guide surface 6a when viewed from the axis L1 direction. Fig.10 As shown, when each cutting edge 32 is defined as a virtual cylinder V that is coaxial with the guide portion 6 and extends from the guide surface 6 a in the second direction X2 with the same outer diameter, each cutting edge 32 extends in the second direction X2 in a state of contacting the virtual cylinder V.

[0066] like Fig.11 , Fig.13 As shown, each blade portion 30 includes a rake face 30a extending radially inward from the cutting edge 32. Therefore, the rake angle of the cutting edge 32 is 90°. In addition, each blade portion 30 includes a flank face 30b extending circumferentially from the cutting edge 32. Fig.13 As shown, when viewed from the direction of the axis L1, the back face 30b extends linearly on the inner side of the guide surface 6a. Therefore, the back angle of each cutting edge 32 is greater than 0°. Therefore, each cutting edge 32 is an acute angle. At the back face 30b, the end edge 30c on the side opposite to the cutting edge 32 in the circumferential direction has an arc shape in which the central part in the axial direction X is recessed toward the cutting edge 32. The end 30d of the end edge 30c in the first direction X1 is continuous with the guide surface 6a in the first direction X1. The end 30e of the end edge 30c in the second direction X2 is continuous with the annular outer peripheral surface 8a of the cylindrical portion 8 in the second direction X2.

[0067] Here, the end edge 30c of the flank 30b on the opposite side to the cutting edge 32 in the circumferential direction is the opening edge portion on one side of the opening edge of the recess 31 in the circumferential direction. The opening edge on the other side of the opening edge of the recess 31 in the circumferential direction is the cutting edge 32 of the blade 30 located on the other side of the circumferential direction of the recess 31. Each recess 31 is long in the axial direction X when viewed from the radial direction. Fig.12As shown, the depth of each recessed portion 31 in the axial direction X is deepest at the central portion, becomes shallower from the central portion toward the first direction X1 , and becomes shallower from the central portion toward the second direction X2 .

[0068] When the deburring tool 1B of this example is used to deburr the workpiece 50, Figure 6 The deburring direction of the deburring tool 1B shown is the same, and the deburring tool 1B is mounted on the spindle 52a of the machine tool 52 via the radial floating holder 51 (step ST1). Then, while the machine tool 52 is driven to rotate the deburring tool 1B in the second rotation direction R2 around the axis L1, the guide surface 6a and the outer peripheral surface 11 of the cutting edge forming portion 7 are brought into contact with the burr removal target surface 50a of the workpiece 50, and moved along the burr removal target surface 50a (step ST2). As a result, the deburring tool 1B cuts off the burrs 55 existing on the edge of the burr removal target surface 50a. In this example, the deburring tool 1B is used without being rotated in the first rotation direction R2.

[0069] The flank surface 30b extending in the circumferential direction from the cutting edge 32 may be curved. For example, the flank surface 30b may be an arc curved in a direction away from the guide surface 6a as it moves away from the cutting edge 32 on the inner side of the guide surface 6a when viewed from the axis L1.

[0070] In this example, the shaft portion 2 of the deburring tool 1B includes a guide portion 6 having an annular outer peripheral surface 11 at the front end side of the cutting edge forming portion 7 provided with the cutting edge 32. Therefore, when the rotating cutting edge forming portion 7 of the shaft portion 2 is brought into contact with the burr removal target surface 50a of the workpiece 50 to remove the burr 55, if the guide portion 6 is brought into contact with the burr removal target surface 50a, it is possible to prevent or suppress the burr removal target surface 50a from being located at a position closer to the inner peripheral side than each cutting edge 32. Therefore, it is possible to prevent or suppress the cutting edge 32 from cutting the burr removal target surface 50a.

[0071] In addition, in the deburring tool 1B of this example, the outer diameter dimension of the cutting edge forming portion 7 may be reduced toward the second direction X2. That is, the cutting edge 32 of each blade portion 30 may be slightly inclined toward the inner peripheral side toward the second direction X2. At this time, when each cutting edge 32 is defined as an imaginary truncated cone coaxial with the guide portion 6 and whose outer diameter dimension decreases from the guide surface 6a toward the second direction X2, each cutting edge 32 is set to contact the imaginary truncated cone. In this way, in the deburring process of connecting the deburring tool 1B to the spindle 52a of the machine tool 52 via the radial floating retainer 51 to perform deburring, even when the deburring tool 1B is tilted, it is possible to prevent or suppress the base end side portion of the cutting edge 32 that leaves the guide surface 6a toward the second direction X2 from biting the burr removal target surface 50a. Therefore, it is possible to prevent or suppress the deburring tool 1A from damaging the burr removal target surface 50a during the deburring process.

Claims

1. A deburring tool, characterized in that: A shaft portion having a cylindrical shape, When one side of the axis direction in the direction along the axis of the shaft portion is set as the front and the other side is set as the rear, the shaft portion includes: a guide portion having an annular guide surface around the axis; and a cutting edge forming portion including a cutting edge extending from the guide surface toward the rear, The cutting edge forming portion includes an outer peripheral surface continuous with the rear of the guide surface and a groove provided on the outer peripheral surface. The groove extends from the guide surface toward the rear, has the deepest depth at the center portion in the axial direction, becomes shallower from the center portion toward the front, and becomes shallower from the center portion toward the rear. In the opening edge of the groove of the cutting edge forming portion, the opening edge portion extending from the guide surface toward the rear is a cutting edge, When viewed from the axial direction, the entire cutting edge forming portion overlaps with the guide portion.

2. The deburring tool according to claim 1, characterized in that: The groove includes: a first inner wall surface and a second inner wall surface, the first inner wall surface and the second inner wall surface are opposite to each other in the circumferential direction around the axis; and a bottom surface extending along the circumferential direction and connecting an end portion of the inner circumference side of the first inner wall surface and an end portion of the inner circumference side of the second inner wall surface, The opening edge portion is a corner portion where the first inner wall surface intersects with the outer peripheral surface and a corner portion where the second inner wall surface intersects with the outer peripheral surface.

3. The deburring tool according to claim 2, characterized in that: The groove extends in parallel with the axis along the axis direction with a constant width, The first inner wall surface and the second inner wall surface respectively extend in a radial direction centered on the axis.

4. The deburring tool according to claim 1, characterized in that: The outer diameter dimension of the cutting edge forming portion is constant in the axial direction.

5. The deburring tool according to claim 1, characterized in that: The outer diameter of the cutting edge forming portion decreases toward the rear.

6. The deburring tool according to claim 1, characterized in that: The shaft portion includes a front end portion at a front end, and the front end portion includes an annular curved outer peripheral surface that curves inwardly from the guide surface toward the front direction.

7. The deburring tool according to claim 1, characterized in that: The shaft portion includes, at the rear of the cutting edge forming portion, a cylindrical portion having the same outer diameter as that of the guide portion.

8. The deburring tool according to claim 1, characterized in that: The rake face of the cutting edge extending from the cutting edge toward the inner peripheral side extends radially, A clearance surface of the cutting edge extending from the cutting edge in the circumferential direction extends inside the guide surface when viewed from the axial direction.

9. A deburring method, characterized in that: The rear end portion of the shaft of the deburring tool according to claim 1 is mounted on a machine tool via a radial floating cage, With the radially floating retainer and the deburring tool rotated about the axis, the guide portion and the cutting edge forming portion are brought into contact with a burr removal target surface of a workpiece and moved along the burr removal target surface, thereby removing burrs from the burr removal target surface.

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