Gear processing equipment

Abstract

To provide a gear processing device which can generate a highly accurate internal tooth by pouring fluid over a wide range in the peripheral direction of an inner peripheral surface of a workpiece.SOLUTION: A gear skiving cutter T constituting a gear processing device 1 includes a fluid discharge nozzle 60 having a first discharge channel 64 and a second discharge channel 65. The first discharge channel 64 discharges fluid F1 toward a position different from a processing point P of an inner peripheral surface of a workpiece W from a first opening 64a at an angle at which the processing point P is located. The second discharge channel 65 discharges fluid F2 toward a cutting blade 52 from a second opening 65a at an angle at which the processing point P is located, or discharges the fluid F2 toward a position different in the axial direction of the workpiece W from the position to which the fluid is discharged from the first discharge channel 64 of the inner peripheral surface of the workpiece W from the second opening 65a.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a gear machining device. [Background technology]

[0002] Patent Documents 1 and 2 describe gear machining devices that use a gear skiving cutter to machine a workpiece, thereby generating internal teeth on the inner peripheral surface of the workpiece. The documents describe that the gear skiving cutter in these gear machining devices is equipped with a fluid discharge nozzle, located near the rotation axis, that discharges a fluid (e.g., a coolant solution) radially outward. The fluid discharged from the fluid discharge nozzle can remove chips and the like, enabling good gear machining. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-24060 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-164751 Summary of the Invention [Problem to be solved by the invention]

[0004] In a processing method for generating internal teeth on the inner peripheral surface of a workpiece using a gear skiving cutter, the rotation axis of the gear skiving cutter is set to have an axis crossing angle with respect to the rotation axis of the workpiece, and the gear skiving cutter is moved relative to the workpiece in the axial direction of the workpiece.

[0005] Because the gear skiving cutter and the workpiece have an axis-crossing angle, the fluid discharged from the outer peripheral surface of the fluid discharge nozzle is applied only to a partial circumferential area of ​​the inner peripheral surface of the workpiece. For example, if the fluid is applied near the processing point of the gear skiving cutter, the fluid may not be applied to an area of ​​the inner peripheral surface of the workpiece in the circumferential direction that is different from the processing point.

[0006] In particular, when machining internal teeth on the inner peripheral surface of a workpiece, chips are more likely to accumulate on the inner peripheral surface of the workpiece than when machining external teeth on the outer peripheral surface of the workpiece. Chips accumulated on the inner peripheral surface of the workpiece may cause a deterioration in the machining accuracy of the internal teeth. Therefore, when machining internal teeth using a gear skiving cutter, it is necessary to clean a wide circumferential area of ​​the inner peripheral surface of the workpiece with a fluid.

[0007] The present invention has been made in consideration of such problems, and aims to provide a gear machining device that can create highly accurate internal teeth by spraying fluid over a wide circumferential area of ​​the inner surface of a workpiece from the fluid discharge nozzle of a gear skiving cutter. [Means for solving the problem]

[0008] One aspect of the present invention is a gear machining device that includes a gear skiving cutter, and generates internal teeth on an inner peripheral surface of a workpiece by moving the gear skiving cutter relatively in an axial direction of the workpiece while the rotation axis of the gear skiving cutter has an axis crossing angle with respect to the rotation axis of the workpiece, The gear skiving cutter is A cutting blade formed on the outer peripheral surface of the gear skiving cutter for processing the inner peripheral surface of the workpiece; A fluid discharge nozzle configured by a shaft member and provided closer to the rotation axis of the gear skiving cutter than the cutting blade, and discharging a fluid from the outer peripheral surface of the shaft member; Equipped with The fluid discharge nozzle is a first discharge flow path configured to discharge the fluid from a first opening in an outer peripheral surface of the fluid discharge nozzle; a second discharge flow path configured to discharge the fluid from a second opening on an outer peripheral surface of the fluid discharge nozzle; Equipped with the first discharge flow path is configured to discharge the fluid from the first opening toward a position on the inner peripheral surface of the workpiece that is different from the processing point, at an angle at which a processing point is located in the circumferential direction of the inner peripheral surface of the workpiece, The second discharge flow path is configured in a gear machining device to discharge the fluid from the second opening toward the cutting edge at an angle in the circumferential direction of the inner surface of the workpiece at which the machining point is located, or to discharge the fluid from the second opening toward a position on the inner surface of the workpiece that is different in the axial direction of the workpiece from the position at which the fluid is discharged from the first discharge flow path. [Effects of the Invention]

[0009] According to the gear machining device, the gear skiving cutter is provided with a fluid discharge nozzle that discharges a fluid from the outer peripheral surface. The fluid discharge nozzle has a first discharge flow path and a second discharge flow path. The first discharge flow path and the second discharge flow path each discharge the fluid toward different positions in the circumferential direction of the inner peripheral surface of the workpiece at an angle where the machining point is located. The first discharge flow path and the second discharge flow path are configured in either of the following first and second aspects.

[0010] In a first aspect, the first discharge flow path discharges the fluid toward a position on the inner peripheral surface of the workpiece that is different from the processing point, at an angle where the processing point is located in the circumferential direction of the inner peripheral surface of the workpiece. The second discharge flow path discharges the fluid toward the cutting blade of the gear skiving cutter, at an angle where the processing point is located in the circumferential direction of the inner peripheral surface of the workpiece. Because the fluid discharged from the second discharge flow path is discharged toward the cutting blade of the gear skiving cutter, it falls on the inner peripheral surface of the workpiece near the processing point immediately after hitting the cutting blade. In other words, at the angle (phase) where the processing point is located in the circumferential direction of the inner peripheral surface of the workpiece, the fluid discharged from the first discharge flow path falls on a position on the inner peripheral surface of the workpiece that is different from the processing point, while the fluid discharged from the second discharge flow path falls on the inner peripheral surface of the workpiece near the processing point.

[0011] During machining, the gear skiving cutter rotates around its rotation axis, and the fluid discharge nozzle also rotates around the rotation axis of the gear skiving cutter. Therefore, the first discharge flow path and the second discharge flow path discharge fluid toward areas in the circumferential direction of the gear skiving cutter other than the angle at which the machining point is located. The fluid discharged from the second discharge flow path is directed toward the cutting blade even in areas other than the angle at which the machining point is located. On the other hand, the fluid discharged from the first discharge flow path is directed toward a position different from the cutting blade in areas other than the angle at which the machining point is located.

[0012] Therefore, at the angle where the machining point is located in the circumferential direction of the inner circumferential surface of the workpiece, the fluid discharged from the second discharge passage can be applied to the inner circumferential surface of the workpiece. Even if the fluid discharged from the second discharge passage cannot be applied to the inner circumferential surface of the workpiece W at angles other than the machining point in the circumferential direction of the inner circumferential surface of the workpiece, the fluid discharged from the first discharge passage can be applied to the inner circumferential surface of the workpiece. Therefore, when machining internal teeth with a gear skiving cutter, even if there is an axis-crossing angle, a wide range in the circumferential direction of the inner circumferential surface of the workpiece can be cleaned with the fluid.

[0013] In a second aspect, the first discharge passage discharges the fluid toward a position on the workpiece that is different from the processing point at an angle in the circumferential direction of the inner circumferential surface of the workpiece where the processing point is located. The second discharge passage discharges the fluid toward a position on the inner circumferential surface of the workpiece that is different in the axial direction of the workpiece from the position where the first discharge passage discharges the fluid at an angle in the circumferential direction of the inner circumferential surface of the workpiece where the processing point is located. In other words, at the angle in the circumferential direction of the inner circumferential surface of the workpiece where the processing point is located, the fluid discharged from the first discharge passage and the fluid discharged from the second discharge passage each reach different positions on the inner circumferential surface of the workpiece in the axial direction of the workpiece.

[0014] During machining, the gear skiving cutter rotates about its rotation axis, and the fluid discharge nozzle also rotates about the rotation axis of the gear skiving cutter. Therefore, the first discharge flow path and the second discharge flow path discharge fluid toward areas in the circumferential direction of the gear skiving cutter other than the angle at which the machining point is located. In other words, in areas other than the angle at which the machining point is located, the first discharge flow path and the second discharge flow path discharge fluid toward different positions in the axial direction of the gear skiving cutter.

[0015] Therefore, at a certain angle in the circumferential direction of the inner circumferential surface of the workpiece, the fluid discharged from the second discharge passage can be applied to the inner circumferential surface of the workpiece. At another angle, even if the fluid discharged from the second discharge passage cannot be applied to the inner circumferential surface of the workpiece, the fluid discharged from the first discharge passage can be applied to the inner circumferential surface of the workpiece. Therefore, when machining internal teeth with a gear skiving cutter, even if there is an axis-crossing angle, it is possible to clean a wide range of the inner circumferential surface of the workpiece with the fluid.

[0016] As described above, according to the above aspect, a gear machining device can be provided that can create highly accurate internal teeth by spraying fluid from the fluid discharge nozzle of the gear skiving cutter over a wide circumferential area of ​​the inner surface of the workpiece. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 2 is a perspective view showing a gear machining device. [Figure 2] FIG. 2 is a diagram showing a workpiece and a gear skiving cutter in a state of being machined in the first embodiment, as viewed from the axial direction of the workpiece. [Figure 3] 3 is a cross-sectional view taken along line III-III in FIG. 2, further showing the fluid being discharged from the fluid discharge nozzle. FIG. [Figure 4] 4 is a cross-sectional view taken along line IV-IV in FIG. 2, further showing the fluid being discharged from the fluid discharge nozzle. FIG. [Figure 5] 5 is a view of the fluid discharge nozzle shown in FIG. 4 as viewed from the V direction. [Figure 6] 3 is a cross-sectional view taken along the line III-III in FIG. 2, further showing the fluid being discharged from the fluid discharge nozzle, and showing a state in which the fluid discharge nozzle has been rotated 180° from the state in FIG. [Figure 7] 4. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2, further showing the fluid being discharged from the fluid discharge nozzle, in a state where the fluid discharge nozzle has been rotated 180° from the state in FIG. [Figure 8] (a) is a graph showing the behavior of the workpiece shaft current value from the start to the end of machining, and (b) is a graph showing the behavior of the workpiece shaft current value from the start to the end of machining when only the second discharge flow path is used instead of the first discharge flow path. [Figure 9] FIG. 10 is a cross-sectional view showing a workpiece and a gear skiving cutter in a machining state in a second embodiment, taken along the axial direction of the gear skiving cutter, passing through the machining point. [Figure 10] 9A is a cross-sectional view showing the workpiece and the gear skiving cutter in a machining state in embodiment 2, taken along the axial direction of the gear skiving cutter through the machining point, and shows the state in which the fluid discharge nozzle has been rotated 180° from the state shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] (Embodiment 1) 1. Configuration of gear processing device 1 The gear cutting device 1 will be described with reference to Fig. 1. The gear cutting device 1 is a device that generates a tooth profile (gear teeth) on the workpiece W using the gear skiving cutter T by moving the workpiece W and the gear skiving cutter T relative to each other while rotating them. In particular, in this embodiment, an example will be given of the gear cutting device 1 generating internal teeth on the inner peripheral surface of the workpiece W.

[0019] The gear machining device 1 is a general-purpose machine tool, for example, a machining center. The machining center is configured to allow tools to be replaced, and is capable of machining according to the attached tool. For example, replaceable gear cutting tools include a gear skiving cutter T, a hob cutter, a shaper cutter, etc. By replacing with a hob cutter or a shaper cutter, the gear machining device 1 becomes a device that processes a tooth profile (gear teeth) on the workpiece W by hobbing or shaping.

[0020] Furthermore, examples of replaceable tools other than gear cutting tools include end mills, milling tools, drills, turning tools, threading tools, grinding tools, etc. Note that a tool changer and a tool magazine that stores multiple tools are not shown in Fig. 1.

[0021] In this embodiment, the machining center serving as the gear machining device 1 shown in Fig. 1 is basically a horizontal machining center. However, the gear machining device 1 can also be configured in other ways, such as a vertical machining center.

[0022] As shown in FIG. 1, the gear machining device 1 has, for example, three linear drive axes (X-axis, Y-axis, and Z-axis) that are perpendicular to one another. The gear machining device 1 is configured to enable relative movement of the workpiece W and the gear skiving cutter T in the X-axis direction, Y-axis direction, and Z-axis direction. Here, the direction parallel to the rotation axis Ct of the gear skiving cutter T (equal to the rotation axis of the tool spindle) is defined as the Z-axis direction, and the two axes perpendicular to the Z-axis direction are defined as the X-axis and Y-axis. In FIG. 1, the horizontal direction is defined as the X-axis direction, and the vertical direction is defined as the Y-axis direction.

[0023] Furthermore, the gear machining device 1 has one rotational drive shaft (rotational drive shaft about the B-axis) for changing the relative posture between the workpiece W and the gear skiving cutter T. In this embodiment, the B-axis is an axis parallel to the Y-axis direction. The gear machining device 1 also has a rotational drive shaft (rotational drive shaft about the Ct-axis) for rotating the gear skiving cutter T and a rotational drive shaft (rotational drive shaft about the Cw-axis) for rotating the workpiece W. In this embodiment, the rotational axis Ct of the gear skiving cutter T is always parallel to the Z-axis direction. The rotational axis Cw of the workpiece W is a horizontal axis and can be angled relative to the Z-axis and X-axis directions depending on the B-axis angle. However, the rotational axis Ct of the gear skiving cutter T may also be configured to be angled relative to the Z-axis and X-axis directions.

[0024] In the gear cutting device 1, the configuration for moving the workpiece W and the gear skiving cutter T relative to each other can be selected as appropriate. For example, the gear cutting device 1 may be configured to have an A-axis, which is a rotation axis parallel to the X-axis direction, instead of the B-axis. In the following, an example will be given of the gear cutting device 1 in which the gear skiving cutter T is capable of linear movement in the Y-axis and Z-axis directions, the workpiece W is capable of linear movement in the X-axis direction, and the workpiece W is also capable of rotation around the B-axis.

[0025] The gear machining apparatus 1 includes a bed 10, a workpiece holding device 20, a tool holding device 30, and a control device 40. The bed 10 is placed on an installation surface and formed into a shape corresponding to the shapes of the workpiece holding device 20 and the tool holding device 30. In this embodiment, the bed 10 is, for example, rectangular. A pair of X-axis guide rails 11 extending in the X-axis direction and a pair of Z-axis guide rails 12 extending in the Z-axis direction are formed on the upper surface of the bed 10.

[0026] The workpiece holding device 20 mainly comprises an X-axis moving table 21, a B-axis rotating table 22, and a workpiece spindle device 23. The X-axis moving table 21 is driven by a driving device such as a linear motor or a ball screw mechanism (not shown), and moves in the X-axis direction while being guided by the X-axis guide rails 11 of the bed 10.

[0027] The B-axis rotating table 22 is placed on the upper surface of the X-axis moving table 21 and moves in the X-axis direction integrally with the X-axis moving table 21. The B-axis rotating table 22 is also provided so as to be rotatable about the B-axis relative to the X-axis moving table 21. A rotary motor and a rotation angle detector (not shown) are provided on the B-axis rotating table 22, and the B-axis rotating table 22 can be rotated about the B-axis by driving the rotary motor.

[0028] The workpiece spindle device 23 is provided on the B-axis rotary table 22 and rotates integrally with the B-axis rotary table 22 about the B-axis. The workpiece spindle device 23 rotatably holds the workpiece W. A rotation motor and a rotation angle detector (not shown) are provided in the workpiece spindle device 23, and the workpiece spindle device 23 is capable of rotating the workpiece W about the Cw-axis by driving the rotation motor. In this way, the workpiece holding device 20 enables the workpiece W to move in the X-axis direction, rotate about the B-axis, and rotate about the Cw-axis relative to the bed 10.

[0029] In detail, the workpiece spindle device 23 includes a housing 23a and a spindle 23b. The housing 23a of the workpiece spindle device 23 is fixed to the B-axis rotary table 22, and the spindle 23b of the workpiece spindle device 23 is rotatably supported by the housing 23a. The workpiece W is attached to the tip of the spindle 23b. In other words, the workpiece W is cantilevered by the spindle 23b of the workpiece spindle device 23. In this embodiment, the spindle 23b of the workpiece spindle device 23 holds the outer peripheral surface of the workpiece W in order to machine the inner peripheral surface of the workpiece W.

[0030] The tool holding device 30 mainly comprises a column 31, a saddle 32, and a tool spindle device 33. The column 31 is driven by a driving device such as a linear motor or a ball screw mechanism (not shown), and moves in the Z-axis direction while being guided by Z-axis guide rails 12 of the bed 10. A Y-axis guide rail 31a is formed on the side surface (left surface in FIG. 1) of the column 31 that extends in the vertical direction. The saddle 32 is driven by a driving device such as a linear motor or a ball screw mechanism (not shown), and moves in the Y-axis direction while being guided by Y-axis guide rail 31a of the column 31.

[0031] The tool spindle device 33 is provided on the saddle 32 and moves integrally with the saddle 32 in the Y-axis direction. The tool spindle device 33 holds the gear skiving cutter T. A rotation motor and a rotation angle detector (not shown) are provided in the tool spindle device 33, and the tool spindle device 33 is capable of rotating the gear skiving cutter T about the Ct axis by driving the rotation motor. In this way, the tool holding device 30 holds the gear skiving cutter T so that it can move in the Y-axis and Z-axis directions relative to the bed 10 and can rotate about the Ct axis.

[0032] In detail, the tool spindle unit 33 includes a housing 33a and a spindle 33b. The housing 33a of the tool spindle unit 33 is fixed to the saddle 32, and the spindle 33b of the tool spindle unit 33 is rotatably supported by the housing 33a. A gear skiving cutter T is attached to the tip of the spindle 33b. In other words, the gear skiving cutter T is cantilevered by the spindle 33b of the tool spindle unit 33. Furthermore, in this embodiment, a flow path (not shown) that passes through in the axial direction is formed in the center of the spindle 33b of the tool spindle unit 33, i.e., a flow path through which a fluid such as an aqueous coolant solution flows. In other words, the spindle 33b has a through-coolant structure.

[0033] The control device 40 includes a processor (arithmetic processing unit) and a storage device, and controls each driving device by executing a machining program. That is, the control device 40 controls the rotation of the gear skiving cutter T about the Ct axis, the rotation of the workpiece W about the Cw axis, the relative movement between the workpiece W and the gear skiving cutter T, etc.

[0034] In detail, the control device 40 positions the rotation axis Ct of the gear skiving cutter T at a cross-axis angle α with respect to the rotation axis Cw of the workpiece W. In this embodiment, the control device 40 rotates the B-axis rotary table 22, thereby positioning the workpiece W and the gear skiving cutter T at the cross-axis angle α. Then, the control device 40 generates internal teeth on the inner peripheral surface of the workpiece W by moving the gear skiving cutter T relative to the workpiece W in the axial direction of the workpiece W while synchronously rotating the workpiece W and the gear skiving cutter T.

[0035] 2. Gear skiving cutter T configuration The configuration of the gear skiving cutter T will be described with reference to Figs. 2 to 5. The gear skiving cutter T is a tool for generating internal teeth on the inner peripheral surface of a workpiece W. The gear skiving cutter T includes a cutter body 50, a fluid discharge nozzle 60, and an adjusting collar 70. In this embodiment, the gear skiving cutter T has an example in which the cutter body 50, the fluid discharge nozzle 60, and the adjusting collar 70 are separate members, but these may also be formed integrally as a single member.

[0036] The cutter body 50 is attached to the spindle 33b (shown in FIG. 1) of the tool spindle device 33 and rotates integrally with the spindle 33b. The cutter body 50 includes a spindle attachment portion 51 and a plurality of cutting blades 52.

[0037] The spindle mounting part 51 is detachably attached to the tip of the spindle 33b. As shown in FIG. 4, a flow path 51a is formed in the center of the spindle mounting part 51, penetrating in the direction of the rotation axis Ct of the gear skiving cutter T. The flow path 51a of the spindle mounting part 51 communicates with a flow path (not shown) formed in the center of the spindle 33b. Therefore, the fluid (aqueous coolant solution) that flows through the flow path of the spindle 33b flows through the flow path 51a in the spindle mounting part 51 of the cutter body 50. A female thread is formed on the inner peripheral surface of the flow path 51a on the tip side of the cutter body 50.

[0038] 4, the spindle mounting portion 51 has a recess 51b formed on the tip surface side (left side in FIG. 4) of the cutter body 50 (corresponding to the tip surface side of the gear skiving cutter T). The recess 51b is in communication with the flow path 51a, and the inner diameter of the recess 51b is larger than the inner diameter of the flow path 51a.

[0039] The multiple cutting edges 52 are formed on the outer peripheral surface of the cutter body 50 (corresponding to the outer peripheral surface of the gear skiving cutter T), and are blades for machining the inner peripheral surface of the workpiece W. The multiple cutting edges 52 are arranged in the circumferential direction of the cutter body 50. In this embodiment, the multiple cutting edges 52 are formed at equal intervals in the circumferential direction as an example, but they may also be formed at unequal intervals by providing notched edges.

[0040] The multiple cutting edges 52 may be formed to have a positive or negative helix angle with respect to the rotation axis Ct of the gear skiving cutter T, or may be formed parallel (with a zero helix angle). The helix angle of the cutting edges 52 is determined by the helix angle of the internal teeth of the workpiece W and, among the machining conditions, the crossed axis angle α between the rotation axis Cw of the workpiece W and the rotation axis Ct of the gear skiving cutter T.

[0041] Each of the multiple cutting edges 52 has a rake face 52a that is the axial end face of the cutter body 50, a front clearance face 52b that is the outer peripheral surface of the cutter body 50, and a side clearance face 52c that is a surface normal to the circumferential direction of the cutter body 50. In this embodiment, the rake face 52a of the cutting edge 52 is formed to have a positive rake angle, but can be set to have any rake angle.

[0042] The front clearance surface 52b of the cutting edge 52 is formed so as to be inclined with respect to the rotation axis Ct of the gear skiving cutter T, i.e., so as to be located on a conical surface. In other words, the front clearance surface 52b of the cutting edge 52 has a positive front clearance angle. However, the front clearance surface 52b of the cutting edge 52 may be formed so as to be parallel to the rotation axis Ct of the gear skiving cutter T, i.e., so as to be located on a cylindrical surface. In other words, the circumscribing surfaces of the multiple cutting edges 52 may be formed on a conical surface or a cylindrical surface. The side clearance surface 52c of the cutting edge 52 is formed so as to be inclined with respect to the tooth trace direction of the cutting edge 52. In other words, the side clearance surface 52c of the cutting edge 52 has a positive side clearance angle.

[0043] In the following, in the axial direction of the gear skiving cutter T, the side of the rake face 52a of the cutting blade 52 (left side in Figure 4) is referred to as the front, and the back side of the rake face 52a of the cutting blade 52 (right side in Figure 4) is referred to as the rear.

[0044] The fluid discharge nozzle 60 is composed of a shaft member. The outer shape of the fluid discharge nozzle 60 is formed to resemble, for example, the shape of a hexagonal bolt. However, the outer shape of the fluid discharge nozzle can be various shapes, such as a bolt shape with a cylindrical head, a bolt shape without a head, or a shaft member without a male thread.

[0045] In this embodiment, as shown in FIG. 4 , the fluid discharge nozzle 60 includes a small-diameter shaft portion 61 and a large-diameter head portion 62 provided coaxially with the small-diameter shaft portion 61. An external thread capable of engaging with the internal thread of the flow passage 51a of the cutter body 50 is formed on the outer peripheral surface of the small-diameter shaft portion 61. A portion of the axial direction of the small-diameter shaft portion 61 is inserted forward of the flow passage 51a of the cutter body 50 and is threaded with the internal thread of the flow passage 51a. In this manner, the fluid discharge nozzle 60 is integrally provided with the cutter body 50, closer to the rotation axis Ct of the gear skiving cutter T than the cutting blade 52 of the cutter body 50. The central axis of the cutter body 50 and the central axis of the fluid discharge nozzle 60 are coaxial and are arranged to coincide with the rotation axis Ct of the gear skiving cutter T.

[0046] In addition, a portion of the large diameter head 62 of the fluid discharge nozzle 60 is accommodated in the recess 51b of the cutter body 50, and the remaining portion of the large diameter head 62 protrudes axially forward (axially outward) beyond the axial tip surface of the cutter body 50.

[0047] The fluid discharge nozzle 60 is configured to discharge fluid that has flowed from a flow path (not shown) formed in the center of the main shaft 33b through a flow path 51a in the main shaft mounting portion 51 of the cutter body 50, radially outward from the outer surface of the shaft member.

[0048] 4 and 5, the fluid discharge nozzle 60 includes a central flow path 63, a first discharge flow path 64, and a second discharge flow path 65. The central flow path 63 is formed in the center of the fluid discharge nozzle 60 and extends in the axial direction of the fluid discharge nozzle 60. The rear end (right side in FIG. 4) of the central flow path 63, i.e., the axial end of the portion inserted into the flow path 51a of the cutter body 50, is open. On the other hand, the front end (left side in FIG. 4) of the central flow path 63 is closed. In other words, the central flow path 63 is formed over the entire length of the small diameter shaft portion 61 and is formed in a part of the large diameter head portion 62.

[0049] The first discharge flow path 64 is formed to extend radially in the large-diameter head 62. The first discharge flow path 64 is formed in the large-diameter head 62 to communicate between the central flow path 63 and a first opening 64a on the outer peripheral surface of the large-diameter head 62. Therefore, the first discharge flow path 64 is configured to discharge the fluid supplied from the flow path 51a of the cutter body 50 from the first opening 64a. In Figures 3 and 4, the fluid discharged from the first discharge flow path 64 is designated as F1.

[0050] As shown in Fig. 5, a plurality of first discharge flow paths 64 are provided. In Fig. 5, the first discharge flow paths 64 are formed in, for example, three locations in the circumferential direction. However, the number of first discharge flow paths 64 is not limited to three, and may be one, two, four or more. In this embodiment, the first discharge flow paths 64 are preferably formed at equal intervals (120° intervals) in the circumferential direction, but may be formed at unequal intervals. From the viewpoint of ease of manufacture, the first discharge flow paths 64 are formed near the center in the circumferential direction on each plane of the outer circumferential surface of the large-diameter head 62.

[0051] 4, the first discharge flow path 64 is configured to discharge the fluid F1 in a direction toward the radially outer side of the fluid discharge nozzle 60 in an axial cross section of the fluid discharge nozzle 60. Furthermore, the first discharge flow path 64 is configured to discharge the fluid F1 in a direction that is inclined forward as it moves radially outward from the fluid discharge nozzle 60 with respect to a direction perpendicular to the axis of the fluid discharge nozzle 60. The forward inclination angle of the first discharge flow path 64 is β1.

[0052] Here, the direction perpendicular to the axis of the fluid discharge nozzle 60 refers to a direction toward the radially outward side of the fluid discharge nozzle 60 in an axial cross section of the fluid discharge nozzle 60, and is a direction perpendicular to the rotation axis Ct of the gear skiving cutter T. Furthermore, a direction toward the radially outward side of the fluid discharge nozzle 60 in an axial cross section of the fluid discharge nozzle 60, which is inclined forward by an axis crossing angle α (shown in FIG. 3 ) with respect to the direction perpendicular to the axis of the fluid discharge nozzle 60, is referred to as a reference forward inclination direction.

[0053] The forward inclination angle β1 of the first discharge flow path 64 may be set to coincide with the axis-crossing angle α. However, the forward inclination angle β1 of the first discharge flow path 64 may be set to an angle closer to the axis-crossing angle α than to 0°. In other words, the first discharge flow path 64 may be configured to discharge the fluid F1 in a direction closer to the reference forward inclination direction than to a direction perpendicular to the axis of the fluid discharge nozzle 60 in the axial cross section of the fluid discharge nozzle 60.

[0054] The second discharge flow path 65 is formed to extend radially in the large-diameter head 62. The second discharge flow path 65 is formed in the large-diameter head 62 to communicate between the central flow path 63 and a second opening 65a on the outer peripheral surface of the large-diameter head 62. Therefore, the second discharge flow path 65 is configured to discharge the fluid supplied from the flow path 51a of the cutter body 50 from the second opening 65a. In Figures 3 and 4, the fluid discharged from the second discharge flow path 65 is referred to as F2.

[0055] As shown in FIG. 5, a plurality of second discharge passages 65 are provided in the circumferential direction. In FIG. 5, three second discharge passages 65 are formed. However, the number of second discharge passages 65 is not limited to three, and may be one, two, four or more. In this embodiment, the second discharge passages 65 are preferably formed at equal intervals (120° intervals) in the circumferential direction, but may be formed at uneven intervals. From the viewpoint of ease of manufacture, the second discharge passages 65 are formed near the center in the circumferential direction on each plane of the outer circumferential surface of the large-diameter head 62. Each of the plurality of second discharge passages 65 is provided between adjacent first discharge passages 64 in the circumferential direction. In other words, the first discharge passages 64 and the second discharge passages 65 are alternately arranged in the circumferential direction of the fluid discharge nozzle 60.

[0056] 4, the second discharge flow path 65 is configured to discharge the fluid F2 in a direction toward the radially outer side of the fluid discharge nozzle 60 in an axial cross section of the fluid discharge nozzle 60. Furthermore, the second discharge flow path 65 is configured to discharge the fluid F2 in a direction inclined rearward relative to the direction perpendicular to the axis of the fluid discharge nozzle 60, as the radially outer side of the fluid discharge nozzle 60 approaches the fluid discharge nozzle 60. The rearward inclination angle of the second discharge flow path 65 is β2. In this way, the first discharge flow path 64 and the second discharge flow path 65 are configured to have different angles with respect to the rotation axis Ct of the gear skiving cutter T in an axial cross section of the fluid discharge nozzle 60.

[0057] The rearward inclination angle β2 of the second discharge flow path 65 is preferably equal to or greater than 0° and equal to or less than the axis-crossing angle α. However, the second discharge flow path 65 may also be angled so as to be inclined forward. In this case, the inclination angle (not shown) of the second discharge flow path 65 is set to be smaller than the forward inclination angle β1 of the first discharge flow path 64. In other words, the second discharge flow path 65 is preferably configured to discharge the fluid F2 in a direction closer to the axial orthogonal direction of the fluid discharge nozzle 60 than the reference forward inclination direction in the axial cross section of the fluid discharge nozzle 60.

[0058] The adjustment collar 70 is formed in a cylindrical shape. The adjustment collar 70 is sandwiched between the bottom surface of the recess 51b of the cutter body 50 and the axial end surface of the large-diameter head 62 of the fluid discharge nozzle 60. The axial position of the fluid discharge nozzle 60 relative to the cutter body 50 can be adjusted by adjusting the axial length of the adjustment collar 70. In other words, the adjustment collar 70 can adjust the position of the first opening 64a of the first discharge flow path 64 and the position of the second opening 65a of the second discharge flow path 65 of the fluid discharge nozzle 60.

[0059] 3. Gear skiving Gear skiving, in which internal teeth are generated on the inner peripheral surface of a workpiece W using a gear skiving cutter T, will be described with reference to FIGS. 2 to 7. Under the control of the control device 40, the rotation axis Ct of the gear skiving cutter T and the rotation axis Cw of the workpiece W are set to a state in which they form an axis crossing angle α, as shown in FIG. 3. Furthermore, under the control of the control device 40, the gear skiving cutter T is moved relative to the workpiece W in the axial direction of the workpiece W while the workpiece W and the gear skiving cutter T are rotated synchronously. In this manner, internal teeth are generated on the inner peripheral surface of the workpiece W.

[0060] When performing gear skiving, a fluid (aqueous coolant solution) is supplied to a flow path (not shown) in the main shaft 33b. Then, the fluid is discharged from the outer peripheral surface of the large-diameter head 62 of the fluid discharge nozzle 60.

[0061] As described above, the fluid discharge nozzle 60 is formed with the first discharge flow path 64. Therefore, the fluid F1 is discharged from the first opening 64a of the first discharge flow path 64. As shown in Fig. 4, the first discharge flow path 64 is configured to discharge the fluid F1 from the first opening 64a toward a position on the inner peripheral surface of the workpiece W different from the processing point P, at an angle at which the processing point P is located in the circumferential direction of the inner peripheral surface of the workpiece W.

[0062] When the first discharge flow path 64 is positioned at an angle rotated 180° from the processing point P in the circumferential direction of the inner peripheral surface of the workpiece W, it discharges the fluid F1 toward a position away from the front of the inner peripheral surface of the workpiece W, as shown in Fig. 7. As the processing of the workpiece W by the gear skiving cutter T progresses, the first discharge flow path 64, at an angle rotated 180° from the processing point P, may enter a state in which it discharges the fluid F1 toward the outside in front of the workpiece W rather than toward the inner peripheral surface of the workpiece W.

[0063] As shown in Figures 3 and 6, when the first discharge flow path 64 is positioned at an angle other than the angle of the processing point P and other than an angle rotated 180° from the processing point P, the fluid F1 is discharged in the axial direction between the case of Figure 3 and the case of Figure 7.

[0064] As described above, the fluid discharge nozzle 60 is formed with the second discharge passage 65 in addition to the first discharge passage 64. Therefore, the fluid F2 is discharged from the second opening 65a of the second discharge passage 65. As shown in FIG. 4 , the second discharge passage 65 is configured to discharge a portion of the fluid F2 from the second opening 65a toward the cutting edge 52 at an angle at which the processing point P is located in the circumferential direction of the inner peripheral surface of the workpiece W. Furthermore, the second discharge passage 65 is configured to discharge a portion of the fluid F2 from the second opening 65a toward a position on the inner peripheral surface of the workpiece W that is different in the axial direction of the workpiece W from the position at which the fluid F2 is discharged from the first discharge passage 64, at an angle at which the processing point P is located in the circumferential direction of the inner peripheral surface of the workpiece W.

[0065] In this way, a portion of the fluid F2 discharged from the second opening 65a of the second discharge flow path 65 hits the cutting edge 52 and scatters around the cutting edge 52. In particular, the position of a portion of the fluid F2 is adjusted so that it is discharged toward the rake face 52a of the cutting edge 52. Another portion of the fluid F2 discharged from the second opening 65a of the second discharge flow path 65 hits directly against the inner circumferential surface of the workpiece W without hitting the cutting edge 52. However, depending on the position of the gear skiving cutter T with respect to the workpiece W, a portion of the fluid F2 may be discharged toward the outside of the workpiece W rather than toward the inner circumferential surface of the workpiece W.

[0066] When the second discharge flow path 65 is positioned at an angle rotated 180° from the processing point P in the circumferential direction of the inner peripheral surface of the workpiece W, it discharges the fluid F1 toward the rear outside of the workpiece W, rather than toward the inner peripheral surface of the workpiece W, as shown in Fig. 7. However, the second discharge flow path 65 may be configured to discharge toward the inner peripheral surface of the workpiece W at an angle rotated 180° from the processing point P. Then, as the processing of the workpiece W by the gear skiving cutter T progresses, the second discharge flow path 65, at an angle rotated 180° from the processing point P, reaches a state in which it discharges the fluid F2 toward a position farther rearward on the inner peripheral surface of the workpiece W.

[0067] As shown in Figures 3 and 6, when the second discharge flow path 65 is positioned at an angle other than the angle of the processing point P and other than an angle rotated 180° from the processing point P, it discharges fluid F2 in the axial direction between the case of Figure 3 and the case of Figure 7.

[0068] 4. Effects of the First Embodiment In the gear machining device 1 of the first embodiment, the gear skiving cutter T includes a fluid discharge nozzle 60. The fluid discharge nozzle 60 includes a first discharge flow path 64 configured to discharge a fluid F1 from a first opening 64a on the outer circumferential surface of the fluid discharge nozzle 60, and a second discharge flow path 65 configured to discharge a fluid F2 from a second opening 65a on the outer circumferential surface of the fluid discharge nozzle 60.

[0069] The first discharge flow path 64 and the second discharge flow path 65 discharge the fluids F1 and F2 toward different positions, respectively, at an angle in the circumferential direction of the inner circumferential surface of the workpiece W at which the processing point P is located.

[0070] Specifically, as shown in Figure 4, the first discharge flow path 64 is configured to discharge fluid F1 from the first opening 64a toward a position on the inner surface of the workpiece W that is different from the processing point P, at an angle at which the processing point P is located in the circumferential direction of the inner surface of the workpiece W.

[0071] 7, the second discharge flow path 65 is configured to discharge the fluid F1 from the second opening 65a toward the cutting edge 52 at an angle where the processing point P is located in the circumferential direction of the inner circumferential surface of the workpiece W. The second discharge flow path 65 is also configured to discharge the fluid F2 from the second opening 65a toward a position on the inner circumferential surface of the workpiece W that is different in the axial direction of the workpiece W from the position where the fluid F2 is discharged from the first discharge flow path 64.

[0072] In the first embodiment, the second discharge passage 65 discharges a portion of the fluid F2 toward the cutting edge 52, and discharges another portion of the fluid F2 toward the inner circumferential surface of the workpiece W. However, the second discharge passage 65 may be configured to discharge all of the fluid F2 toward the cutting edge 52. Furthermore, the second discharge passage 65 may be configured to discharge all of the fluid F2 toward a position on the inner circumferential surface of the workpiece W that is different in the axial direction of the workpiece W from the position where the fluid F2 is discharged from the first discharge passage 64.

[0073] That is, in a first mode, the first discharge flow path 64 discharges the fluid F1 toward a position on the inner peripheral surface of the workpiece W different from the processing point P, at an angle where the processing point P is located in the circumferential direction of the inner peripheral surface of the workpiece W. On the other hand, the second discharge flow path 65 discharges the fluid F2 toward the cutting blade 52 of the gear skiving cutter T, at an angle where the processing point P is located in the circumferential direction of the inner peripheral surface of the workpiece W. The fluid F2 discharged from the second discharge flow path 65 is discharged toward the cutting blade 52 of the gear skiving cutter T, and therefore, immediately after hitting the cutting blade 52, it is applied to the inner peripheral surface of the workpiece W near the processing point P. That is, at the angle (phase) where the processing point P is located in the circumferential direction of the inner peripheral surface of the workpiece W, the fluid F1 discharged from the first discharge flow path 64 is applied to a position on the inner peripheral surface of the workpiece W different from the processing point P, whereas the fluid F2 discharged from the second discharge flow path 65 is applied to the inner peripheral surface of the workpiece W near the processing point P.

[0074] During machining, the gear skiving cutter T rotates about the rotation axis Ct, and therefore the fluid discharge nozzle 60 also rotates about the rotation axis Ct of the gear skiving cutter T. Therefore, the first discharge flow path 64 and the second discharge flow path 65 discharge the fluids F1 and F2 in areas in the circumferential direction of the gear skiving cutter T other than the angle at which the machining point P is located. The fluid F2 discharged from the second discharge flow path 65 is directed toward the cutting edge 52 even in areas other than the angle at which the machining point P is located. On the other hand, the fluid F1 discharged from the first discharge flow path 64 is directed toward a position different from the cutting edge 52 in areas other than the angle at which the machining point P is located.

[0075] Therefore, at the angle at which the machining point P is located in the circumferential direction of the inner peripheral surface of the workpiece W, the fluid F2 discharged from the second discharge passage 65 can be applied to the inner peripheral surface of the workpiece W. Even if the fluid F2 discharged from the second discharge passage 65 cannot be applied to the inner peripheral surface of the workpiece W at angles other than the angle at which the machining point P is located in the circumferential direction of the inner peripheral surface of the workpiece W, the fluid F1 discharged from the first discharge passage 64 can be applied to the inner peripheral surface of the workpiece W. Therefore, when machining internal teeth with the gear skiving cutter T, even if there is an axis-crossing angle α, a wide range in the circumferential direction of the inner peripheral surface of the workpiece W can be cleaned with the fluid.

[0076] In a second aspect, the first discharge flow path 64 discharges the fluid F1 toward a position on the workpiece W that is different from the processing point P at an angle where the processing point P is located in the circumferential direction of the inner circumferential surface of the workpiece W. The second discharge flow path 65 discharges the fluid F2 toward a position on the inner circumferential surface of the workpiece W that is different in the axial direction of the workpiece W from the position where the fluid F2 is discharged from the first discharge flow path 64 at an angle where the processing point P is located in the circumferential direction of the inner circumferential surface of the workpiece W. In other words, at the angle where the processing point P is located in the circumferential direction of the inner circumferential surface of the workpiece W, the fluid F1 discharged from the first discharge flow path 64 and the fluid F2 discharged from the second discharge flow path 65 will each be applied to different positions on the inner circumferential surface of the workpiece W in the axial direction of the workpiece W.

[0077] During machining, the gear skiving cutter T rotates about the rotation axis Ct, and therefore the fluid discharge nozzle 60 also rotates about the rotation axis Ct of the gear skiving cutter T. Therefore, the first discharge flow path 64 and the second discharge flow path 65 discharge the fluids F1, F2 toward areas in the circumferential direction of the gear skiving cutter T other than the angle at which the machining point P is located. In other words, in areas other than the angle at which the machining point P is located, the first discharge flow path 64 and the second discharge flow path 65 discharge the fluids F1, F2 toward different positions in the axial direction of the gear skiving cutter T.

[0078] Therefore, at a certain angle in the circumferential direction of the inner circumferential surface of the workpiece W, the fluid F2 discharged from the second discharge passage 65 can be applied to the inner circumferential surface of the workpiece W. At another angle, even if the fluid F2 discharged from the second discharge passage 65 cannot be applied to the inner circumferential surface of the workpiece W, the fluid F1 discharged from the first discharge passage 64 can be applied to the inner circumferential surface of the workpiece W. Therefore, when machining internal teeth with the gear skiving cutter T, even if there is an axis-crossing angle α, a wide range in the circumferential direction of the inner circumferential surface of the workpiece W can be cleaned with the fluids F1 and F2.

[0079] Therefore, by spraying the fluids F1 and F2 from the fluid discharge nozzle 60 of the gear skiving cutter T onto a wide circumferential area of ​​the inner peripheral surface of the workpiece W, highly accurate internal teeth can be created.

[0080] This effect will be described with reference to Figures 8(a) and 8(b). Figure 8(a) is a graph showing the current value of the spindle motor of the workpiece spindle device 23 over time during gear skiving when embodiment 1 is applied. The current value of the spindle motor of the workpiece spindle device 23 corresponds to the load that the workpiece W receives during machining.

[0081] Fig. 8(b) is a graph for a configuration corresponding to the prior art. That is, Fig. 8(b) is a graph showing the current value of the spindle motor of the workpiece spindle device 23 over time during gear skiving processing in a configuration in which the first discharge flow path 64 in the fluid discharge nozzle 60 is replaced with the second discharge flow path 65.

[0082] As shown in Figures 8(a) and 8(b), the current value increases as machining begins and decreases as machining ends. The magnitude of the variation in the current value during machining is large in Figure 8(b), whereas it is small in Figure 8(a). In particular, the variation in the current value during machining is stable in Figure 8(a), whereas the variation is large in the first half of machining and small in the second half of machining in Figure 8(b).

[0083] In Fig. 8(b), it is thought that the chip jamming had an effect in the first half of machining. On the other hand, as shown in Fig. 8(a), by configuring the gear cutting device 1 as in embodiment 1, it is possible to improve the chip cleaning effect and reduce the chip jamming in the first half of machining.

[0084] Furthermore, according to the configuration of the first embodiment, as shown in FIG. 4, the first discharge flow path 64 and the second discharge flow path 65 are configured to have different angles with respect to the rotation axis Ct of the gear skiving cutter T in the axial cross section of the fluid discharge nozzle 60. This allows the fluids F1 and F2 to be reliably discharged toward the desired positions. Furthermore, the axial length of the large-diameter head 62 of the fluid discharge nozzle 60 can be shortened. In other words, the amount by which the fluid discharge nozzle 60 protrudes forward from the cutter body 50 can be reduced. As a result, interference with other components can be suppressed, thereby increasing the degree of freedom in designing those other components.

[0085] 4, the first discharge flow path 64 is configured to discharge the fluid F1 in a direction closer to the reference forward inclination direction (a direction inclined forward by the axis crossing angle α) than the axial orthogonal direction of the fluid discharge nozzle 60 in an axial cross section of the fluid discharge nozzle 60. Meanwhile, the second discharge flow path 65 is configured to discharge the fluid F2 in a direction closer to the axial orthogonal direction than the reference forward inclination direction in an axial cross section of the fluid discharge nozzle 60. This allows the fluids F1 and F2 to clean a wide circumferential range of the inner circumferential surface of the workpiece W, particularly at the beginning of machining.

[0086] 4, the second discharge flow path 65 is configured to discharge the fluid F2 in a direction that is inclined rearward toward the radially outer side of the fluid discharge nozzle 60 in the axial cross section of the fluid discharge nozzle 60. This allows the fluid F2 discharged from the second discharge flow path 65 to be reliably aimed at the rake face 52a of the cutting edge 52. Therefore, cleaning of the most important machining point P can be reliably performed.

[0087] Furthermore, the first discharge flow paths 64 and the second discharge flow paths 65 are each provided in multiple locations in the circumferential direction of the fluid discharge nozzle 60, and the first discharge flow paths 64 and the second discharge flow paths 65 are arranged alternately in the circumferential direction of the fluid discharge nozzle 60. The fluid discharge nozzle 60 constitutes part of the gear skiving cutter T and therefore rotates together with the cutter body 50 of the gear skiving cutter T. The different discharge directions of the fluids F1 and F2 may cause rotational imbalance. However, because the first discharge flow paths 64 and the second discharge flow paths 65 are alternately formed in the circumferential direction, rotational imbalance can be suppressed. In particular, the angles between adjacent first discharge flow paths 64 and second discharge flow paths 65 are equal. This more effectively suppresses rotational imbalance.

[0088] (Embodiment 2) A gear machining apparatus 1 of embodiment 2 will be described with reference to Figures 9 and 10. The gear machining apparatus 1 of embodiment 2 differs from embodiment 1 only in the direction of the first discharge flow path 64 and the direction of the second discharge flow path 65 of the fluid discharge nozzle 60. Note that, of the symbols used in embodiment 2, those that are the same as those used in the previous embodiments represent the same components, etc. as those in the previous embodiments, unless otherwise specified.

[0089] 9 and 10, the first discharge flow path 64 and the second discharge flow path 65 are configured to have the same angle with respect to the rotation axis Ct of the gear skiving cutter T in the axial cross section of the fluid discharge nozzle 60. In particular, in this embodiment, the first discharge flow path 64 and the second discharge flow path 65 are configured to be in a direction perpendicular to the rotation axis Ct of the gear skiving cutter T in the axial cross section of the fluid discharge nozzle 60.

[0090] The first opening 64a and the second opening 65a are formed at different positions in the axial direction of the fluid discharge nozzle 60. In other words, the first discharge flow path 64 and the second discharge flow path 65 are formed at different positions in the axial direction of the fluid discharge nozzle 60.

[0091] In the second embodiment, as in the first embodiment, as shown in Fig. 9, the first discharge flow path 64 is configured to discharge the fluid F1 from the first opening 64a toward a position on the inner peripheral surface of the workpiece W that is different from the processing point P, at an angle where the processing point P is located in the circumferential direction of the inner peripheral surface of the workpiece W. As shown in Fig. 10, the second discharge flow path 65 is configured to discharge the fluid F2 from the second opening 65a toward the cutting edge 52, at an angle where the processing point P is located in the circumferential direction of the inner peripheral surface of the workpiece W, or to discharge the fluid F2 from the second opening 65a toward a position on the inner peripheral surface of the workpiece W that is different in the axial direction of the workpiece W from the position where the fluid is discharged from the first discharge flow path 64. In the second embodiment, the same effects as in the first embodiment are achieved. [Explanation of symbols]

[0092] 1 Gear processing equipment 52 cutting edge 60 fluid discharge nozzle 64 First discharge passage 64a First opening 65 Second discharge flow path 65a Second opening F1,F2 Fluid P processing point T Gear Skiving Cutter W Workpiece Cw Rotation axis of the workpiece Ct Rotation axis of gear skiving cutter α axis intersection angle

Claims

1. A gear machining device comprising a gear skiving cutter, the gear skiving cutter being moved relatively in an axial direction of the workpiece while the rotation axis of the gear skiving cutter has an axis crossing angle with respect to the rotation axis of the workpiece, thereby generating internal teeth on an inner peripheral surface of the workpiece, The gear skiving cutter is A cutting blade formed on the outer peripheral surface of the gear skiving cutter for processing the inner peripheral surface of the workpiece; A fluid discharge nozzle configured by a shaft member and provided closer to the rotation axis of the gear skiving cutter than the cutting blade, and discharging a fluid from the outer peripheral surface of the shaft member; Equipped with The fluid discharge nozzle is a first discharge flow path configured to discharge the fluid from a first opening in an outer peripheral surface of the fluid discharge nozzle; a second discharge flow path configured to discharge the fluid from a second opening on an outer peripheral surface of the fluid discharge nozzle; Equipped with the first discharge flow path is configured to discharge the fluid from the first opening toward a position on the inner peripheral surface of the workpiece that is different from the processing point, at an angle at which a processing point is located in the circumferential direction of the inner peripheral surface of the workpiece, the second discharge passage is configured to discharge the fluid from the second opening toward the cutting edge at an angle at which the machining point is located in the circumferential direction of the inner peripheral surface of the workpiece, or to discharge the fluid from the second opening toward a position on the inner peripheral surface of the workpiece that is different in the axial direction of the workpiece from the position at which the fluid is discharged from the first discharge passage.

2. The gear machining device according to claim 1, wherein the first discharge flow path and the second discharge flow path are configured to have different angles with respect to a rotation axis of the gear skiving cutter in an axial cross section of the fluid discharge nozzle.

3. In the axial direction of the gear skiving cutter, the rake surface side of the cutting blade is the front, and the back side of the rake surface of the cutting blade is the rear, In the axial cross section of the fluid discharge nozzle, a direction toward the radial outside of the fluid discharge nozzle and a direction perpendicular to the rotation axis of the gear skiving cutter are defined as an axially perpendicular direction, a reference forward inclination direction, which is a direction toward the radially outer side of the fluid discharge nozzle in an axial cross section of the fluid discharge nozzle and is inclined forward by the axis crossing angle with respect to the axis-orthogonal direction as the radially outer side of the fluid discharge nozzle approaches, the first discharge flow path is configured to discharge the fluid in a direction closer to the reference forward inclination direction than the axially orthogonal direction in an axial cross section of the fluid discharge nozzle, The gear machining device according to claim 2 , wherein the second discharge flow passage is configured to discharge the fluid in a direction closer to the axis-orthogonal direction than the reference forward inclination direction in an axial cross section of the fluid discharge nozzle.

4. 4. The gear machining device according to claim 3, wherein the second discharge flow passage is configured to discharge the fluid in a direction inclined rearward radially outward from the fluid discharge nozzle in an axial cross section of the fluid discharge nozzle.

5. The first discharge flow path and the second discharge flow path are configured so that their angles with respect to the rotation axis of the gear skiving cutter are the same in the axial cross section of the fluid discharge nozzle, The gear machining device according to claim 1 , wherein the first opening and the second opening are formed at different positions in the axial direction of the fluid discharge nozzle.

6. a plurality of the first discharge flow paths and a plurality of the second discharge flow paths are provided in a circumferential direction of the fluid discharge nozzle, The gear machining device according to any one of claims 1 to 5, wherein the first discharge flow paths and the second discharge flow paths are arranged alternately in a circumferential direction of the fluid discharge nozzle.

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