JP2018024060A - Gear cutting tool, gear machining apparatus and gear machining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear cutting tool capable of supplying a coolant liquid to an optimum position even if a cutting edge is re-sharpened. SOLUTION: A gear cutting tool 42 is provided in a tool body 110 having a plurality of blades 112a on the outer peripheral surface and having a center hole 113, and a center hole 113 of the tool body 110 so that a fixed position in the tool body 110 can be adjusted. It is provided with a nozzle 120. The nozzle 120 has a flow path 123 that flows in the coolant liquid supplied to the central hole 113 of the tool body 110 and discharges the coolant liquid toward the plurality of blades 112a. [Selection diagram] Fig. 2

Description

  The present invention relates to a gear cutting tool, a gear machining apparatus, and a gear machining method.

  Patent Document 1 describes a gear cutting tool having a discharge hole on the center side of the gear cutting tool. In this gear cutting tool, coolant liquid is discharged from the discharge hole located on the center side of the gear cutting tool toward the blade located on the outer peripheral side. As a result, the chips generated by the gear processing can be removed from the cutting site by the discharged coolant liquid.

  Patent Document 2 describes a gear cutting tool in which oil supply holes are formed on a rake face of a plurality of blades on the outer peripheral side. It is supposed that coolant liquid is supplied from this oil supply hole. Further, Patent Document 3 describes a grindstone structure in which a passage for supplying a coolant liquid is formed inside the grindstone.

Japanese Patent Application Laid-Open No. 2015-164751 JP-A 51-65481 Japanese Utility Model Publication No. 63-763

  In the gear cutting tool, the cutting edge is worn with processing, so that the cutting edge is re-polished to obtain a desired cutting edge shape. By re-sharpening the cutting edge, the cutting edge position changes. However, in Patent Literature 1, the coolant liquid discharge hole formed on the center side is located at a fixed position, and therefore cannot cope with the change in the blade edge position. Therefore, there is a problem that when the blade edge is re-polished, the coolant liquid cannot be supplied to the optimum position.

  The present invention provides a gear cutting tool capable of supplying a coolant liquid to an optimum position even when the edge of the blade is re-polished, and further, a gear machining device using the gear cutting tool, and the tooth An object of the present invention is to provide a gear machining method using a cutting tool.

  A gear cutting tool according to the present invention has a tool body having a plurality of blades on an outer peripheral surface and a center hole at a central portion thereof, and a coolant liquid supplied to the center hole of the tool body is introduced into the tool cutting tool. A nozzle that has a flow path that discharges toward the plurality of blades, and that is provided in a center hole of the tool body so that a fixed position in the tool body can be adjusted.

  A gear machining apparatus according to the present invention holds the gear cutting tool described above, a gear to be machined, a workpiece holder that can rotate around a central axis of the gear, the gear cutting tool, A tool holder that is rotatably provided around the central axis of the gear cutting tool and is relatively movable in the direction of the central axis of the gear.

  In the gear machining method according to the present invention, the gear cutting tool is relatively moved in the direction of the central axis of the gear while rotating the gear cutting tool and the gear to be machined. The gear is processed.

  By the above, the nozzle in a gear cutting tool can be adjusted with respect to a tool main body. Therefore, even if the blade tip position changes when a plurality of blades in the tool body are re-polished, the position of the nozzle can be adjusted. That is, the position at which the coolant liquid is discharged at the nozzle can be adjusted. Therefore, even if the blade is re-polished, the coolant liquid discharged from the nozzle can be supplied to the optimum position on the blade.

It is a figure which shows a gear processing apparatus. It is an axial sectional view of the gear cutting tool of a first embodiment. It is a figure which shows the axial direction sectional drawing of a workpiece holder, and a gear machining method. It is an axial sectional view of the gear cutting tool after re-polishing of the first embodiment. It is an axial sectional view of the gear cutting tool of the second embodiment.

<1. First embodiment>
(1-1. Configuration of Gear Processing Device 1)
The configuration of the gear machining apparatus 1 will be described with reference to FIG. As an example of the gear machining apparatus 1, a 5-axis machining center is taken as an example. That is, the gear machining device 1 is a device having three rectilinear axes (X, Y, Z axes) and two rotation axes (A axis, C axis) orthogonal to each other as drive axes.

  As shown in FIG. 1, the gear machining apparatus 1 includes a bed 10, a column 20, a saddle 30, a rotation main shaft 40, a gear cutting tool 42, a tool holder 43, a slide table 50, and a tilt table 60. And a rotary table 70, a workpiece holder 80, and a coolant supply device 90. Although not shown, a known automatic tool changer is provided along with the bed 10.

  The bed 10 is placed on the floor. A column 20 is provided on the upper surface of the bed 10 so as to be movable in the X-axis direction (horizontal direction). Further, a saddle 30 is provided on the side surface of the column 20 so as to be movable in the Y-axis direction (vertical direction). The rotation spindle 40 is rotatably provided by a spindle motor (not shown) housed in the saddle 30.

  The gear cutting tool 42 has a plurality of blades on the outer peripheral surface. In the present embodiment, the gear cutting tool 42 is a tool used for skiving. Skiving is a state in which the central axis of the gear W to be processed and the central axis of the gear cutting tool 42 have a crossing angle (three-dimensional crossing state), and the gear W and the gear cutting tool 42 to be processed are In this method, the gear W is processed by the gear cutting tool 42 by relatively moving the gear cutting tool 42 in the direction of the central axis of the gear W while rotating the gears.

  The tool holder 43 holds the gear cutting tool 42 on the tip side. The proximal end side of the tool holder 43 is fixed to the distal end of the rotation main shaft 40. Therefore, the tool holder 43 can be rotated around the central axis of the gear cutting tool 42 by the rotation of the rotary spindle 40.

  A slide table 50 is provided on the upper surface of the bed 10 so as to be movable in the Z-axis direction (horizontal direction). A tilt table support portion 63 that supports the tilt table 60 is provided on the upper surface of the slide table 50. The tilt table support portion 63 is provided with a tilt table 60 that can swing around the horizontal A axis. The tilt table 60 is provided with a rotary table 70 so as to be rotatable around a C axis perpendicular to the A axis. A workpiece holder 80 that holds a gear W as a processing target is mounted on the rotary table 70. The workpiece holder 80 is formed in a different shape depending on whether the gear W as the object to be processed is an internal gear or an external gear.

  The coolant liquid supply device 90 supplies the coolant liquid stored in a coolant tank (not shown) to the rotation main shaft 40. The coolant liquid supplied to the center hole of the rotation main shaft 40 is supplied from the rotation main shaft 40 to the center hole of the gear cutting tool 42 via the center hole of the tool holder 43 and discharged radially from the center of the gear cutting tool 42. Is done.

(1-2. Detailed configuration of the gear cutting tool 42)
A detailed configuration of the gear cutting tool 42 will be described with reference to FIG. As shown in FIG. 2, the gear cutting tool 42 includes a tool body 110, a nozzle 120, and a spacer 130.

  The tool main body 110 includes a shaft portion 111 and a large-diameter end portion 112 formed integrally with the tip of the shaft portion 111. The shaft portion 111 has a cylindrical outer peripheral surface. The proximal end side (the right side in FIG. 2) of the outer peripheral surface of the shaft portion 111 is held by the tool holder 43 shown in FIG. The shaft portion 111 is disposed coaxially with the tool holder 43 and the rotation main shaft 40.

  The large-diameter end 112 has a plurality of blades 112a in the circumferential direction on the outer peripheral surface. The torsion angles of the plurality of blades 112a are determined based on the torsion angle of the gear W to be processed and the intersection angle between the gear W and the gear cutting tool 42 at the time of processing. Further, the plurality of blades 112a have a rake face on the left end face in FIG. 2, a front flank face on the blade edge face, and a side flank face on the blade side face. In the present embodiment, the circumscribed surfaces of the tooth tips of the plurality of blades 112a have a conical shape having a front clearance angle on the front clearance surface.

  Moreover, the tool main body 110 is provided with the center hole 113 penetrated to an axial direction. The coolant liquid supplied from the coolant liquid supply device 90 flows into the center hole 113 of the tool body 110 through the center hole of the rotation main shaft 40 and the center hole of the tool holder 43. The center hole 113 has a cylindrical inner peripheral surface 113 a formed in most of the shaft portion 111. That is, the cylindrical inner peripheral surface 113a of the center hole 113 is formed on the base end side (the right side in FIG. 2) of the tool main body 110. Further, the center hole 113 has a female screw 113 b in a part of the shaft part 111 and a large part of the large diameter end part 112 of the tool main body 110. That is, the female screw 113b is formed on the distal end side (left side in FIG. 2) of the tool main body 110.

  Furthermore, the tool main body 110 includes a recess 114 at the center on the distal end side (left side in FIG. 2). The recess 114 of the tool body 110 has a space larger in diameter than the female screw 113b. A center hole 113 of the tool main body 110 opens into the recess 114. The recess 114 is provided with a mounting seat surface 114a formed in a flat and annular shape around the opening of the female screw 113b.

  The nozzle 120 is attached to the center hole 113 of the tool main body 110. Furthermore, the nozzle 120 can adjust the axial fixed position of the tool main body 110. The nozzle 120 includes a shaft portion 121 and a head portion 122 provided at the tip of the shaft portion 121 and having a larger diameter than the shaft portion 121.

  The shaft portion 121 of the nozzle 120 has a male screw 121a on the outer peripheral surface. The male screw 121 a of the shaft portion 121 of the nozzle 120 is screwed into the female screw 113 b of the tool body 110. Thus, the shaft part 121 is fastened in a state of being inserted into the center hole 113 of the tool body 110. Furthermore, the nozzle 120 can adjust the fixing position in the tool main body 110 by changing the screwing position of the male screw 121a and the female screw 113b.

  The head portion 122 of the nozzle 120 is formed in a disc shape, and has a flat and annular surface on the shaft portion 121 side. That is, the surface of the head portion 122 of the nozzle 120 faces the mounting seat surface 114 a of the tool body 110. The head portion 122 of the nozzle 120 is provided outside the opening portion of the center hole 113 of the tool main body 110. Specifically, a part of the head 122 of the nozzle 120 is disposed in the recess 114, and the other part of the head 122 of the nozzle 120 is further outward than the opening on the front end side of the recess 114. It is overhanging. That is, the head 122 protrudes outward from the rake face of the plurality of blades 112a of the tool body 110.

  Further, the nozzle 120 includes a flow path 123 in a range from the shaft portion 121 to the head portion 122. The first flow path 123a as a part of the flow path 123 is formed in the shaft portion 121 and is formed to extend in the axial direction. Therefore, the coolant liquid supplied to the center hole 113 of the tool main body 110 flows into the first flow path 123 a in the shaft portion 121.

  The second channel 123 b as another part of the channel 123 is formed in the head portion 122. The second flow path 123 b communicates with the first flow path 123 a and is formed to extend from the center of the head 122 toward the outer peripheral surface of the head 122. And the 2nd flow path 123b discharges the coolant liquid which flowed in into the 1st flow path 123a toward the radial direction outer side from the outer peripheral surface of the head 122. FIG.

  In particular, the second flow path 123b has a plurality of (for example, four) flow paths that branch from the central flow path of the head portion 122 toward the outer peripheral surface of the head portion 122. Accordingly, the coolant liquid flowing through the second flow path 123b is discharged radially toward the plurality of blades 112a. The discharge direction of the second flow path 123b may be a direction toward the radially outer side, and may be a radial direction (a direction along the radial direction) as described above, or an angle with respect to the radial direction. It can also be a direction having

  The spacer 130 is interposed between the mounting seat surface 114 a of the tool body 110 and the head portion 122 of the nozzle 120 in the axial direction. The spacer 130 is formed in an annular shape. The spacer 130 is inserted through the shaft portion 121 of the nozzle 120. Here, in this embodiment, the spacer 130 is an annular collar member that does not engage with the male screw 121 a of the shaft portion 121 of the nozzle 120. That is, the spacer 130 has a cylindrical inner peripheral surface, and has an annular plane perpendicular to the central axis at both ends.

  The cylindrical inner peripheral surface of the spacer 130 has a slight gap with respect to the outer peripheral surface of the shaft portion 121 of the nozzle 120. Further, one end surface of the spacer 130 is in contact with the mounting seat surface 114 a of the tool main body 110, and the other end surface of the spacer 130 is in contact with the surface of the head portion 122 of the nozzle 120. That is, the spacer 130 is sandwiched between the mounting seat surface 114 a of the tool body 110 and the head portion 122 of the nozzle 120.

  Thus, since the spacer 130 is interposed between the mounting seat surface 114a of the tool body 110 and the head portion 122 of the nozzle 120, the nozzle 130 is adjusted by adjusting the axial length of the spacer 130. 120, the fixing position in the center hole 113 of the tool main body 110 can be adjusted. The spacer 130 is not limited to an annular shape, and may be a simple block shape as long as the position is maintained.

(1-3. Detailed configuration of workpiece holder 80)
Next, a detailed configuration of the workpiece holder 80 will be described with reference to FIG. In the workpiece holder 80, the gear W as a processing target is an internal gear in the present embodiment. The workpiece holder 80 includes a main body 81 and a fan 82.

  The main body 81 is formed in a cylindrical shape and is arranged coaxially with the rotary table 70. The main body 81 holds a gear W as a processing target on the inner peripheral side. Specifically, the main body 81 includes a main body base portion 81a fixed to the rotary table 70 and a lid portion 81b fixed to an end portion of the main body base portion 81a. That is, the main body base portion 81 a holds the outer peripheral surface of the gear W, so that the central axis of the gear W and the rotation center of the rotary table 70 coincide with each other. Further, the flange portion of the gear W is sandwiched between the main body base portion 81a and the lid portion 81b in the axial direction. In this way, the gear W as the object to be processed is fixed to the main body 81 of the workpiece holder 80.

  Furthermore, the main body 81 communicates the cylindrical inner peripheral surface and the outer peripheral surface of the main body 81 at a position closer to the rotary table 70 than the position where the gear W is held (the back side in the traveling direction of the gear cutting tool 42). The discharge hole 81c is provided. As will be described later, the plurality of discharge holes 81 c serve as portions for discharging the coolant liquid and chips discharged from the gear cutting tool 42 to the outside of the workpiece holder 80. The plurality of discharge holes 81c are formed at equal intervals in the circumferential direction.

  The fan 82 is disposed on the radially inner side of the main body 81 of the workpiece holder 80. The fan 82 is disposed between the cutting part of the gear W and the axial direction of the discharge hole 81c. Further, the central axis of the fan 82 coincides with the rotational center of the rotary table 70. Accordingly, the fan 82 rotates around the central axis of the fan 82 as the rotary table 70 rotates. The fan 82 rotates to generate a fluid flow in a direction from the cutting portion of the gear W toward the discharge hole 81c. That is, the fan 82 guides the coolant liquid discharged from the nozzle 120 to the discharge hole 81c.

(1-4. Gear cutting method)
Next, the gear cutting method will be described with reference to FIG. In FIG. 3, the thick arrows indicate the flow direction of the coolant liquid.

  As shown in FIG. 3, the gear W is held on the inner peripheral side of the main body 81 of the workpiece holder 80. That is, the central axis of the gear W is coaxial with the rotation center of the rotary table 70. The gear cutting tool 42 is fixed to the tool holder 43. At this time, the central axis of the gear cutting tool 42 has an intersection angle with respect to the central axis of the gear W.

  In this state, the gear W and the gear cutting tool 42 are rotated in synchronization. Then, the coolant liquid supply device 90 supplies the coolant liquid to the rotation main shaft 40. That is, the coolant liquid is supplied to the gear cutting tool 42 through the center hole of the tool holder 43.

  Specifically, in the gear cutting tool 42, the coolant liquid flows into the center hole 113 of the tool body 110. Then, the coolant liquid flows into the first flow path 123 a of the nozzle 120 from the center hole 113 of the tool body 110. Subsequently, the coolant liquid flows from the first flow path 123a of the nozzle 120 into the second flow path 123b and is discharged from the opening of the second flow path 123b. That is, the coolant liquid is discharged radially outward from the outer peripheral surface of the head portion 122 of the nozzle 120. The discharged coolant liquid is directed to the plurality of blades 112a.

  In such a state, the gear cutting tool 42 relatively moves in the axial direction of the gear W. Accordingly, the plurality of blades 112a of the gear cutting tool 42 starts processing the gear W. That is, while the plurality of blades 112a are processing the gear W, the coolant liquid is directed from the outer peripheral surface of the head 122 of the nozzle 120 to the cutting site by the plurality of blades 112a.

  Here, with the rotation of the rotary table 70, the workpiece holder 80 is rotating. That is, the fan 82 of the workpiece holder 80 is rotating. Therefore, in the internal space of the main body 81 of the workpiece holder 80, a fluid flow is generated in the direction toward the discharge hole 81c. Therefore, after reaching the cutting site, the coolant liquid flows in the direction from the cutting site toward the discharge hole 81c and is discharged to the outside from the discharge hole 81c. With the circulation of the coolant liquid, the chips generated by cutting move from the cutting site to the discharge hole 81c and are discharged to the outside from the discharge hole 81c.

(1-5. Shape of the gear cutting tool 42 after re-grinding)
Next, a case where the blade 112a of the gear cutting tool 42 is re-polished will be described with reference to FIG. In FIG. 4, the shape of the blade 112a before re-sharpening is shown by a two-dot chain line.

  The blade 112a of the gear cutting tool 42 is re-polished when worn. When the blade 112a is re-polished, the axial length of the large-diameter end 112 of the tool body 110 is shortened as shown in FIG. At this time, the spacer 130 is also shortened according to the axial length of the large-diameter end portion 112. Accordingly, the relative position between the head portion 122 of the nozzle 120 and the rake face of the blade 112a does not change before and after the re-grinding. Therefore, even after the blade 112a is re-polished, the coolant liquid can be supplied to the portion cut by the blade 112a.

<2. Second embodiment>
Next, the gear cutting tool 42 of the second embodiment will be described with reference to FIG. In the gear cutting tool 42 of the second embodiment, the spacer 230 is substantially different from the gear cutting tool 42 of the first embodiment.

  As shown in FIG. 5, the spacer 230 is a nut that is formed in an annular shape and includes an internal thread 231 on the inner peripheral surface. The female screw 231 of the spacer 230 is screwed into the male screw 121 a of the shaft portion 121 of the nozzle 120. One end surface of the spacer 230 is in contact with the mounting seat surface 114a. The spacer 230 has a double nut structure together with the tool body 110.

  A method for attaching the nozzle 120 to the tool body 110 will be described. The spacer 230 is screwed onto the shaft portion 121 of the nozzle 120. Subsequently, the shaft portion 121 of the nozzle 120 is screwed into the female screw 113 b of the tool main body 110. And the fixed position in the tool main body 110 of the nozzle 120 is determined. Then, the nozzle 120 is fixed with respect to the tool main body 110 by rotating the spacer 230 and pressing it against the mounting seat surface 114a.

  After the re-grinding of the blade 112a, the same fixing method of the nozzle 120 as described above is performed again. Therefore, the relative position between the head portion 122 of the nozzle 120 and the rake face of the blade 112a can be kept unchanged before and after the re-grinding. That is, even after the blade 112a is re-polished, the coolant liquid can be supplied to the cutting site by the blade 112a.

<3. Effects of the embodiment>
The gear cutting tool 42 of the first embodiment and the second embodiment has a tool body 110 having a plurality of blades 112a on the outer peripheral surface and a center hole 113, and a fixed position in the tool body 110 in the center hole 113 of the tool body 110. The nozzle 120 is provided so as to be adjustable. The nozzle 120 has a flow path 123 through which the coolant liquid supplied to the center hole 113 of the tool body 110 flows and discharges the coolant liquid toward the plurality of blades 112a.

  As described above, the nozzle 120 in the gear cutting tool 42 can be adjusted with respect to the tool body 110. For this reason, when the plurality of blades 112a in the tool body 110 are re-polished, the position of the nozzle 120 can be adjusted even if the blade tip position changes. That is, the position at which the coolant liquid is discharged in the nozzle 120 can be adjusted. Therefore, even if the blade 112a is re-polished, the coolant liquid discharged from the nozzle 120 can be supplied to the optimum position on the blade 112a.

  In the first embodiment and the second embodiment, the tool body 110 includes a mounting seat surface 114 a formed around the opening of the center hole 113 of the tool body 110. The nozzle 120 includes a shaft part 121 and a head part 122. The shaft portion 121 is fastened in a state of being inserted into the center hole 113 of the tool main body 110 and has a first flow path 123 a that extends in the axial direction as a part of the flow path 123. The head portion 122 is provided at the end of the shaft portion 121, provided outside the opening of the center hole 113 of the tool body 110, and receives coolant liquid that has flowed into the first flow passage 123 a as another part of the flow passage 123. It has the 2nd flow path 123b discharged toward the radial direction outer side.

  The gear cutting tool 42 includes spacers 130 and 230 interposed between the mounting seat surface 114a and the head 122 in the axial direction. The nozzle 120 can adjust the fixing position of the tool body 110 in the center hole 113 of the tool body 110 by spacers 130 and 230. That is, by using the spacers 130 and 230, the fixing position of the nozzle 120 can be easily adjusted.

  In the first embodiment, the spacer 130 is sandwiched between the mounting seat surface 114 a and the head portion 122 in the axial direction in contact with the mounting seat surface 114 a and the head portion 122 of the nozzle 120. That is, the fixing position of the nozzle 120 can be adjusted by adjusting the axial length of the spacer 130. Here, it is possible to prepare in advance a plurality of spacers 130 having different axial lengths, and it is possible to cut the axial length of the spacers 130 to shorten each time the re-grinding is performed. .

  In particular, in the first embodiment, the center hole 113 of the tool main body 110 has a female screw 113b, and the shaft portion 121 of the nozzle 120 is a male screw 121a that engages with the female screw 113b of the center hole 113 of the tool main body 110. Have Therefore, the nozzle 120 can be easily attached to the center hole 113 of the tool body 110. Further, the spacer 130 is an annular collar member that does not engage with the male screw 121 a of the shaft portion 121 of the nozzle 120. Since the spacer 130 is annular, it is easy to attach the spacer 130 to the shaft portion 121 of the nozzle 120. Furthermore, the fixed position of the nozzle 120 can be easily determined simply by adjusting the length of the spacer 130 in the axial direction.

  In the second embodiment, the center hole 113 of the tool main body 110 has a female screw 113b, and the shaft portion 121 of the nozzle 120 is a male screw 121a that engages with the female screw 113b of the center hole 113 of the tool main body 110. Have Furthermore, the spacer 230 is a nut that engages with the male screw 121 a of the shaft portion 121 of the nozzle 120. That is, the spacer 230 as a nut exhibits a double nut structure together with the female screw 113b of the tool body 110. Thereby, the fixed position of the nozzle 120 can be adjusted easily.

  In the first embodiment and the second embodiment, the gear machining apparatus 1 holds the gear cutting tool 42 and the gear W as a machining target, and a workpiece holder 80 that can rotate around the central axis of the gear W. A tool holder 43 that holds the gear cutting tool 42, is rotatably provided around the central axis of the gear cutting tool 42, and is relatively movable in the central axis direction of the gear W. And the gear W as a process target is an internal gear.

  Here, the workpiece holder 80 is formed in a cylindrical shape, and communicates the cylindrical inner peripheral surface and the outer peripheral surface at a position on the back side in the traveling direction of the gear cutting tool 42 from the position where the gear W is held. A main body 81 having a discharge hole 81c for discharging the coolant liquid, a radially inner side of the main body 81 of the workpiece holder 80, and disposed between the cutting portion of the gear W and the discharge hole 81c in the axial direction; And a fan 82 for guiding the coolant liquid discharged from the nozzle 120 to the discharge hole 81c by generating a fluid flow in a direction from the cutting portion of the gear W toward the discharge hole 81c.

  As a result, the fan 82 guides the chips generated at the cutting site to the discharge hole 81c as the coolant flows from the cutting site to the discharge hole 81c. Accordingly, since the chips are prevented from being accumulated in the vicinity of the cutting site, the gear W can be processed with high accuracy.

  In particular, the gear machining apparatus 1 moves the gear cutting tool 42 relative to the central axis direction of the gear W while rotating the gear cutting tool 42 and the gear W to be machined. A gear machining method for machining W is applied. According to this gear machining method, if the chip accumulates at the tip of the gear cutting tool 42 in the traveling direction, the shape accuracy of the gear W is affected. Therefore, by using the above-described gear cutting tool 42, it is possible to effectively discharge the chips, and as a result, it is possible to process the gear W with high accuracy.

1: gear processing device, 40: rotary spindle, 42: gear cutting tool, 43: tool holder, 70: rotary table, 80: workpiece holder, 81: main body, 81c: discharge hole, 82: fan, 90: 110: Tool body, 112a: Blade, 113: Center hole, 113a: Cylindrical inner peripheral surface, 113b: Female thread, 114: Recess, 114a: Mounting seat surface, 120: Nozzle, 121: Shaft 121a: male thread 122: head 123: flow path 123a: first flow path 123b: second flow path 130, 230: spacer, 231: female thread W: gear

Claims (8)

A tool body having a plurality of blades on the outer peripheral surface and a center hole;
A flow path for supplying the coolant liquid supplied to the center hole of the tool body and discharging the coolant liquid toward the plurality of blades is provided, and a fixing position in the tool body is adjusted to the center hole of the tool body. A nozzle that can be provided;
A gear cutting tool comprising: The tool body includes a mounting seat surface formed around an opening of a center hole of the tool body,
The nozzle is
A shaft portion that is fastened in a state of being inserted into the center hole of the tool body and has a first flow path that extends in the axial direction as a part of the flow path,
Provided at the end of the shaft portion, provided outside the opening portion of the center hole of the tool body, and causing the coolant liquid that has flowed into the first channel as another part of the channel to be radially outward. A head having a second flow path for discharging toward the head;
With
The gear cutting tool includes a spacer interposed between the mounting seat surface and the head in the axial direction,
2. The gear cutting tool according to claim 1, wherein the nozzle is capable of adjusting a fixed position in the tool body in a center hole of the tool body by the spacer.   The gear cutting tool according to claim 2, wherein the spacer is sandwiched between the mounting seat surface and the head in the axial direction while being in contact with the mounting seat surface and the head. The center hole of the tool body has a female screw,
The shaft portion has a male screw that is screwed into a female screw of a center hole of the tool body,
The gear cutter according to claim 3, wherein the spacer is an annular collar member that does not engage with the male screw of the shaft portion. The center hole of the tool body has a female screw,
The shaft portion has a male screw that is screwed into a female screw of a center hole of the tool body,
The gear cutter according to claim 2, wherein the spacer is a nut that is screwed into a male screw of the shaft portion. The gear cutting tool according to any one of claims 1 to 5;
A workpiece holder that holds a gear as a processing target and is rotatable around a central axis of the gear;
A tool holder that holds the gear cutting tool, is rotatably provided around the central axis of the gear cutting tool, and is relatively movable in the direction of the central axis of the gear;
A gear machining apparatus. The gear as the object to be processed is an internal gear,
The workpiece holder is
A discharge hole that is formed in a cylindrical shape and that communicates the cylindrical inner peripheral surface and the outer peripheral surface from the position holding the gear to the back side in the traveling direction of the gear cutting tool, and discharges the coolant liquid. A body having
Arranged radially inside the body of the workpiece holder, arranged between the cutting portion of the gear and the discharge hole, and extending from the cutting portion of the gear toward the discharge hole. A fan that guides the coolant liquid discharged from the nozzle to the discharge hole by generating a flow of fluid;
The gear machining apparatus according to claim 6, comprising:   The gear cutting tool is moved relative to the central axis direction of the gear while rotating the gear cutting tool according to any one of claims 1 to 5 and the gear to be processed. A gear machining method for machining the gear with a tool.

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