JP2003170315A - Method and apparatus for gear grinding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To grind flanks on both sides of a tooth of a gear into a dissimilar shape, and to prevent load of grinding from changing even near the end of a tooth width in grinding a helical gear. <P>SOLUTION: Width of a spiral strip 43 spirally disposed at a peripheral edge of the cylindrical gear grinding tool 42 is set at a narrow width allowing insertion into a tooth space 23a previously machined in the gear 22 to be ground, and the spiral strip 43 is fitted to the tooth space 23a (step S1). The gear grinding tool 42 and the gear 22 to be ground are rotated at synchronous speeds ωT and ωW (step S2) and simultaneously a phase θ is controlled (step S3), thereby grinding the flanks 23b and 23c individually. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear grinding method and a gear grinding apparatus, and more particularly, to grinding a preformed tooth on a gear to be ground by using a gear grinding tool having a spiral grinding portion. The present invention relates to a gear grinding method and a gear grinding device.

[0002]

2. Description of the Related Art A case of grinding a gear to be ground by a gear grinding tool in the prior art will be described with reference to FIG. 14A. The gear grinding tool 100 has a grindstone portion 103 composed of a spiral helix 101 that revolves. On the other hand, the gear 102 to be ground has teeth 104 formed in advance (see, for example, Japanese Patent Laid-Open No. 58-59727). According to this configuration, the spiral strip 101 of the gear grinding tool 100 is engaged with the tooth groove portion of the gear to be ground 102, and the gear grinding tool 100
The tooth flanks 104a and 104b of the gear 102 to be ground are ground by the spiral ridge 101 while rotating the gear 102 and the gear 102 to be ground synchronously. Here, the cross-hatched portion of FIG. 14B shows the tooth surfaces 104a and 104b that are simultaneously ground by the spiral line 101.

[0003]

By the way, in the above-mentioned prior art, since the spiral thread 101 of the gear grinding tool 100 grinds the tooth surfaces 104a and 104b,
The tooth surfaces 104a and 104b are ground into a shape corresponding to the shape of the ground portion of the spiral strip 101. That is, the tooth flanks 104a and 104b have a spiral stripe 1 shape.
01 is restricted by the shape of the tooth surface 104a,
The degree of freedom of the grinding shape of 104b is small. For this reason, in order to grind the tooth surfaces 104a and 104b into a desired shape, it is necessary to prepare a dedicated gear grinding tool having the spiral strip 101 adapted to the desired shape.

Further, as shown in FIG. 15, when both the tooth surfaces 104a and 104b of the helical gear 106 are machined at one time by using the conventional technique, the tooth surfaces 104a and 104b are processed.
Grinding is performed according to trajectories 110a and 110b along b. Here, when the gear grinding tool 100 reaches the end 108 of the tooth width B ₀ of the helical gear 106, the trajectory 1
The ground surface that is being ground along both 10a and 110b has no load on the locus 110b after the end point 108b, while the tooth surface 104a on the locus 110a side continues the grinding operation up to the end point 108a. Therefore,
When the helical gear 106 passes through the end point 108b, a large load variation occurs in the helical gear 106, which adversely affects the accuracy of the helical gear 106.

The present invention has been made in view of the above problems, and makes it possible to grind the tooth flanks and tooth traces of gears into various shapes, and when grinding helical gears. An object of the present invention is to provide a gear grinding method and a gear grinding device in which the load due to grinding does not fluctuate even near the end of the tooth width.

[0006]

In the gear grinding method according to the present invention, a gear to be ground is rotated by a first motor, and a second gear is used.
A gear grinding tool is rotated by a motor in synchronism with the gear to be ground, a spiral line of the gear grinding tool is meshed with the gear to be ground, the gear to be ground is moved in the axial direction, and the ground By changing the phase between the gear for gear and the gear grinding tool, one of the left side tooth surface and the right side tooth surface of the tooth of the gear to be ground is ground by the spiral thread.

In the above method, after grinding either the left side tooth surface or the right side tooth surface, the phase is inverted with respect to the center of the tooth groove, and either the left side tooth surface or the right side tooth surface is reversed. You may make it grind the tooth surface which has not been ground.

Further, the operation of moving the gear to be ground in the axial direction and the operation of bringing the gear to be ground and the gear grinding tool close to each other are made to cooperate, and the teeth of the gear to be ground are crowned ground. May be applied.

Further, the operation of moving the gear to be ground in the axial direction and the phase of the gear to be ground and the gear grinding tool are changed so that the teeth of the gear to be ground are subjected to crowning grinding. You may give it.

Furthermore, the thickness of the spiral stripe of the gear grinding tool may be such that it can reach the tooth bottom without contacting the left side tooth surface and the right side tooth surface.

A gear grinding apparatus according to the present invention includes a first motor for rotating a gear to be ground about an axis,
A gear grinding tool that grinds the teeth of the gear to be ground, a second motor that rotates the gear grinding tool around an axis, and a forward / backward movement of the gear to be ground and the gear grinding tool relative to each other. A cutting mechanism for moving, a traverse mechanism for moving the grinding target gear back and forth in the axial direction, and the first and second motors for rotating the grinding target gear and the gear grinding tool at a synchronous speed, It is characterized by having a rotation phase control unit for controlling the phases of the gear to be ground and the gear grinding tool while performing the advancing / retreating operation of the traverse mechanism.

According to the above construction, since it is possible to grind one tooth surface of the tooth of the gear to be ground and to set the grinding condition freely for each tooth surface, both side surfaces of the tooth are It can be ground to different shapes. In the above configuration, the grinding load does not change even if the vicinity of the end portion of the tooth width is ground, so that it can be suitably used for machining a helical gear or crowning.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the gear grinding method according to the present invention will be described below with reference to the accompanying drawings with reference to FIGS.

A gear grinding apparatus for carrying out the gear grinding method according to the present embodiment basically engages a spiral groove constituting a gear grinding tool with a tooth groove of a gear to be ground, and the gear grinding tool and the gear grinding tool. The grinding is performed while rotating the grinding gear and the grinding gear at a synchronous speed. At this time, the tooth flanks are ground side by side by controlling the mutual phases of the gear grinding tool and the gear to be ground.

As shown in FIG. 1, in the gear grinding apparatus 10 used in the present embodiment, a cutting table 14 is arranged on the upper surface of a bed 12, and the cutting table 14 is operated by a cutting motor 16 rotating. And moves back and forth in the direction of arrow A (cutting mechanism). The traverse table 18 arranged on the upper surface of the cutting table 14 moves forward and backward in the direction perpendicular to the arrow A direction, that is, the arrow B direction under the rotating action of the traverse motor 20 (traverse mechanism).

Further, on the traverse table 18, a gear to be ground 22 having a tooth profile formed in advance is detachably arranged, and the rotating gear to be ground 22 is rotated.
A tooth tip detection sensor 24 including a proximity switch that detects a convex portion of the tooth and generates a predetermined pulse is provided.
The workpiece 22 motor (first motor) 26 rotates under the action of rotation of the work spindle motor (first motor) 26, and the axis of this rotation is set so as to coincide with the forward / backward direction (arrow B direction) of the traverse table 18.

On the other hand, a column 28 is arranged on the bed 12 in the traveling direction of the cutting table 14, and a swivel table 30 is held by the column 28. The swivel table 30 is swivelable in the direction of arrow C by a swivel motor 31 (see FIG. 5) arranged in the column 28. Further, the swivel table 30 is provided with a shift table 32. The shift table 32 is a shift motor. It is movable in the direction of arrow D under the action of 34.

Turning table 30 and shift table 3
2 adjusts the relative position with respect to the gear 22 to be ground, and further, the tooth 2 when the gear 22 to be ground is a helical gear.
Arrow C to match the twist angle β of 3 (see FIG. 9).
The displacement can be adjusted in the direction and the arrow D direction.

As schematically shown in FIG. 2, the shift table 32 is provided with a tool spindle unit 36. The tool spindle unit 36 is basically composed of a tool spindle motor (second motor) 38 and a tool shaft 39 rotated by the tool spindle motor 38. The gear grinding tool 42 that rotates under the action of the tool spindle motor 38 has a columnar shape, and a spiral strip 43 made of a grindstone for grinding the gear 22 to be ground is provided on the periphery thereof.

On the other hand, the tool spindle unit 36 is mounted on the shift table 32. The shift table 32 is connected to a ball screw 35, and the ball screw 35 is rotated by a shift motor 34. Therefore, the tool spindle unit 36 and the gear grinding tool 42 are displaced in the direction of arrow D together with the shift table 32 under the driving action of the shift motor 34.

As shown in FIG. 3, in the tooth groove 23a of the gear 22 to be ground, the spiral thread 43 of the gear grinding tool 42 is
Tooth surface 23b that is the left tooth surface and tooth surface 2 that is the right tooth surface
The thickness is set so that it can reach the tooth bottom portion 23d without abutting on 3c, and the upper and lower corner portions 43b of the tip end portion 43a of the spiral line 43 are formed in a curved shape with a radius R. There is. Here, the tooth surface 23b and the tooth surface 23
Of c, the tooth surface 2 in the clockwise direction when viewed from the tooth bottom portion 23d
3c is the right flank, and the counterclockwise tooth flank 23b is the left flank.

As shown in FIG. 4, the gear 22 to be ground has a tooth width B ₀ and is detachably supported by one end of the work shaft 48 via a set of clamp jigs 50. Work axis 4
A traction drive 51, which is a power transmission mechanism, is connected to the other end of 8 and the traction drive 51 is connected to the work spindle motor 26 via a rotary shaft 49. The rotary shaft 49 is provided with an inertia damper 53 having a function of stabilizing the rotation.

As shown in FIG. 5, the gear grinding device 10 is
It is controlled by the controller 60 as a whole. The controller 60 includes drive circuits 62, 64, 66, 68, 7
0 and 72 are connected via an optical fiber 74. The drive circuits 62 to 72 are respectively provided with a work spindle motor 26, a tool spindle motor 38, and a cutting motor 1 according to a command signal supplied via the optical fiber 74.
6, the traverse motor 20, the swing motor 31, and the shift motor 34 are driven. The controller 60 includes
An input device 76 for setting various conditions for grinding can be connected.

Further, the controller 60 includes a first pulse generator 80 for detecting the rotation of the gear 22 to be ground.
The respective signals obtained from the second pulse generator 82 that detects the rotation of the gear grinding tool 42, the third pulse generator 84 that detects the movement amount of the traverse shaft, and the tooth tip detection sensor 24 are input. It Based on these signals, the controller 60 causes the tool shaft 39, the work shaft 48, the traverse shaft to rotate and move, and the teeth 2 of the gear 22 to be ground.
The position of 3 can be detected.

Further, the controller 60 uses the above various signals to indicate the phase θ indicating the relative positional relationship between the tooth 23 of the gear 22 to be ground and the spiral 43 of the gear grinding tool 42.
It becomes possible to detect the signal (see FIG. 6) and control the phase θ.

Here, the phase θ means, as shown in FIG.
A movement amount by which the spiral line 43 and the teeth 23 relatively move with respect to this reference value with a position where the center line 86 of the spiral line 43 and the center line 88 of the tooth groove 23a coincide as a reference value (θ = 0). Indicates. The phase θ is determined by the gear 22 to be ground and the gear grinding tool 42.
Are stopped with respect to each other and the gear 22 to be ground and the gear grinding tool 42 are rotating at synchronous speeds ω _W and ω _T. The synchronous speeds ω _W and ω _T will be described later. The phase θ has a reference value of “0”,
It can take positive (+) and negative (-) values.

By the way, when the gear to be ground 22 and the gear grinding tool 42 are rotating with respect to each other, the rotation speed and the phase θ of the gear to be ground 22 and the gear grinding tool 42 are determined by the rotation phase controller 60a (see FIG. 5). Control) to a desired value. That is, the first and second pulse generators 8
The rotation of the gear to be ground 22 and the gear grinding tool 42 is detected by the signals 0 and 82, and a command is given to the drive circuits 62 and 64 so that a predetermined phase θ (or rotation speed) is obtained, and control is performed. .

Next, the operation of the gear grinding apparatus 10 thus constructed will be described with reference to FIGS.

First, the gear 22 to be ground is mounted on one end of the work shaft 48 via a clamp jig 50, and
The conditions representing the tooth profile to be ground (for example, grinding amount, module and basic circle diameter, etc.) are input from the input device 76. In addition, the shift table 32 is in the arrow C direction and the arrow D direction (see FIG. 1) according to the size of the gear 22 to be ground and the twist angle β of the tooth trace to be ground (see FIG. 9).
First, make adjustments in advance.

Next, at step S1, the gear grinding tool 42 is rotated at the synchronous speed ω _T , and the gear 22 to be ground is rotated at the synchronous speed ω _W. Synchronous speed of gear grinding tool ω _T
And the synchronous speed ω _W of the gear 22 to be ground are given by the following equation (1), where Z _{T is} the number of spiral threads 43 and Z _W is the number of teeth of the gear 22 to be ground. . ω _W = ω _T × Z _T / Z _W (1)

At this time, as shown in FIG. 8, the gear grinding tool 42 rotates at the synchronous speed ω _T , so that the spiral strip 4 is rotated.
3 apparently moves in the axial direction (direction of arrow V). On the other hand, the gear to be ground 2 while the spiral strip 43 moves one pitch.
Since 2 also rotates by one pitch of the tooth 23, the spiral strip 43
Thus, the relative position of the tooth 23 in the vertical direction is held.

Next, in step S2, the tooth groove 23a of the gear 22 to be ground and the spiral 43 of the gear grinding tool 42 are used.
Mesh with. This operation is automatically performed using the tooth tip detection sensor 24. At this time, the gear grinding tool 4
Since the second spiral strip 43 has a thin thickness which allows it to be inserted into the tooth groove 23a of the gear to be ground 22 from its tip, it must be meshed to the vicinity of the tooth bottom portion 23d of the gear to be ground 22. Is possible.

The meshing operation in step S2 is executed while detecting and confirming the phase θ based on the phase teaching process executed in advance. The phase teaching process is a process of causing the controller 60 to store the phase states of the gear 22 to be ground and the gear grinding tool 42 for automatic meshing. For example,
The gear 22 to be ground and the gear grinding tool 42 are rotated together at low speed, and the phase θ is obtained from the respective signals of the tooth tip detection sensor 24, the first pulse generator 80 and the second pulse generator 82 generated at this time. Is acquired and stored in the controller 60.

This phase teaching process may be performed manually with the work spindle motor 26 and the tool spindle motor 38 turned off.

Next, in step S3, the phase θ between the gear 22 to be ground and the gear grinding tool 42 is changed by the function of the rotary phase controller 60a. The phase θ is, for example, as shown in FIG.
By changing to the positive direction of, the tooth surface 2 of the tooth 23
3b and the spiral strip 43 of the gear grinding tool 42 are brought into contact with each other while sliding, and as a result, the tooth surface 23b is ground.

When the grinding amount is large, the phase θ may be set to be increased stepwise. As a result, a small amount of grinding is performed in stages, and the load on the gear grinding tool 42 that accompanies grinding can be reduced. Since the tooth surface 23c on the opposite side of the tooth surface 23b that is being ground is not in contact with the spiral line 43, grinding is not performed.

Further, the meshing operation in step S2 and the grinding start processing in step S3 may be started simultaneously by cooperating with each other.

Further, in step S4, the traverse motor 20 is driven to rotate while rotating the gear to be ground 22 and the gear grinding tool 42 to rotate the gear to be ground 22.
The traverse table 18 is moved back and forth in the direction of arrow B (see FIG. 1). By moving the gear to be ground 22 back and forth in the direction of the arrow B in this manner, it is possible to uniformly grind the entire surface of the gear to be ground 22 having the tooth width B ₀ . When the gear to be ground 22 is a helical gear,
The synchronous operation of the gear 22 to be ground is appropriately changed according to the forward / backward movement of the traverse table 18 and the twist angle β of the tooth trace (see FIG. 9).

As described above, when grinding a helical gear according to the prior art, when the gear grinding tool 42 reaches the end portion 108 (see FIG. 15), a large load fluctuation occurs. On the other hand, in the present embodiment, as shown in FIG. 9, the spiral strip 43 of the gear grinding tool 42 and the gear 2 to be ground are
The relative position with respect to 2 changes, and the ground portion moves like a locus 92 along the tooth surface 23b. Therefore, the gear to be ground 2
Even if the end portion 94 of the tooth width B ₀ of 2 is ground, the tooth 23
Since only the tooth surface 23b, which is the one surface side, is ground, the load applied to the gear 22 to be ground and the gear grinding tool 42 does not change.

Next, in step S5, the grinding process is confirmed. That is, if the grinding of only one tooth surface of the teeth 23 of the gear 22 to be ground, that is, the tooth surface 23b has been completed, the process returns to step S3. At this time, the sign of the phase θ is inverted with respect to the reference value (for example, to the minus side), and the unground tooth surface 23b or 23c is ground. When the grinding of both tooth surfaces 23b and 23c is completed, post-processing such as stopping each motor is performed and the grinding is completed.

When the tooth surface 23c is ground, it is not necessary to grind the same amount as the original tooth surface 23b, and the phase θ may be different. In other words, the tooth surfaces 23b and 23c on both sides of the tooth 23 can be ground into different shapes, and the tooth surfaces 23b and 23c and tooth traces can be ground into desired shapes. Therefore, the degree of freedom with respect to the tooth surface shape increases.

In the above description, an example in which the spiral strip 43 of the gear grinding tool 42 is brought into mesh with the gear to-be-ground 22 up to the vicinity of the tooth bottom 23d and then grinding is performed, but as shown in FIG. The tooth surface 23 of the gear 22 to be ground
Grinding may be performed by inserting it to an appropriate position of b. In addition, as shown in FIG.
3 is meshed to the vicinity of the tooth bottom portion 23d, and the cutting table 1
Grinding may be performed while retreating No. 4 while checking the signal of the second pulse generator 82, and for example, grinding may be performed along a path such as the locus 96. As a result, the tooth surfaces 23b and 23c can be ground into an arbitrary shape without replacing the gear grinding tool 42.

As described above, according to the present embodiment, the thickness of the spiral thread 43 of the gear grinding tool 42 is equal to the tooth flanks 23b and 2b.
The gear to be ground 2 is ground by using a material having a thickness that can reach the tooth bottom portion 23d without abutting on 3c.
Grinding is performed while changing the phase θ of the gear grinding tool 42 and the gear grinding tool 42. Therefore, the spiral strip 43 of the gear grinding tool 42 comes into contact with and slides only on the tooth surface 23b on one side of the gear to be ground 22, and the tooth surface 23b and the tooth surface 23c can be ground individually. Become. Moreover, by setting different conditions for the grinding amount, the phase θ, the movement amount of the cutting table 14, etc., it is possible to make each of the tooth surfaces 23b and 23c different in shape.

Further, since the teeth 23 can be ground on each side, the load applied to the gear grinding tool 42 is reduced,
The life of the gear grinding tool 42 can be improved.

Next, an example of performing crowning grinding using the gear grinding device 10 will be described.

The crowning grinding refers to a process of grinding tooth traces into a shape having a bulge or a process of grinding tooth traces into various other shapes for the purpose of smoothly meshing gears with each other. In order to perform the crowning grinding on the gear 22 to be ground, in step S4, the gear 22 to be ground and the gear grinding tool 42 are moved at the synchronous speed ω _W ,
While rotating at ω _T , move the traverse table 18 to the arrow B
When performing the advancing / retreating operation in the direction, the phase θ corresponding to the advancing / retreating amount may be set.

That is, data representing the crowning shape is input to the controller 60 from the input device 76 (see FIG. 5), and the controller 60 sets the phase θ according to the amount of advance / retreat B in the direction of arrow B based on this data. . This setting is set, for example, like the curve shown in FIG. 11, and this is stored in a memory (not shown).

The drive circuit 68 and the phase θ of the traverse motor 20 are controlled according to the set values of the curve shown in FIG. With this setting, if the amount of grinding in the center portion of the tooth width B ₀ of the gear to be ground 22 is reduced and the end portion of the tooth width B ₀ is ground more, the crowning tooth shown in FIG. 12A is obtained. You can get a face.

Also in this case, as in the above embodiment,
It is possible to grind the tooth surfaces 23b and 23c so that the tooth surface shape and the crowning shape are different. Further, as shown in FIG. 12B, it is possible to perform crowning grinding on the helical gear. At this time, the load does not change even when the end portion 94 of the tooth width B ₀ is ground.
Furthermore, various irregular shapes of crowning grinding are possible, for example, as shown in FIG. 12C, crowning grinding of a shape asymmetric with respect to the center axis 89 of the tooth width B ₀ is also possible. Another way to do crowning grinding is
Instead of changing the phase θ, as shown in FIG. 13, the amount of advance / retreat of the cutting table 14 in the direction of arrow A may be changed according to the amount of movement B. In this case, arrows A and B
The cutting table 14 may be operated so as to draw the locus 90 with respect to the orthogonal axis constituted by the directions.

The gear grinding method and gear grinding apparatus according to the present invention are not limited to the above-described embodiments, and it goes without saying that various steps or configurations can be adopted without departing from the gist of the present invention.

[0051]

As described above, according to the gear grinding method and the gear grinding apparatus of the present invention, it is possible to grind the tooth flank shape and the tooth trace shape of the gear into various shapes.
In addition, when grinding a helical gear, the load due to grinding does not fluctuate even near the end of the tooth width, which improves the grinding accuracy and the life of the gear grinding tool. The effect is achieved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a gear grinding device according to the present embodiment.

FIG. 2 is a schematic explanatory view showing a positional relationship between a gear grinding tool and a gear to be ground.

FIG. 3 is a partial cross-sectional explanatory view showing a state in which a spiral line of a gear grinding tool meshes with a tooth groove of a gear to be ground.

FIG. 4 is a configuration diagram showing a connected state of a gear to be ground and a work spindle motor.

FIG. 5 is a block diagram showing a control circuit of the gear grinding device according to the present embodiment.

FIG. 6 is an explanatory diagram showing phases of a gear to be ground and a gear grinding tool.

FIG. 7 is a flowchart showing a procedure of a gear grinding method.

FIG. 8 is a schematic explanatory view showing a state in which a gear to be ground is ground by a spiral line of a gear grinding tool.

FIG. 9 is a schematic front explanatory view showing a state in which a helical gear is ground.

FIG. 10A is a partial schematic cross-sectional explanatory view showing an example of performing grinding by inserting a spiral stripe to an appropriate position of a tooth groove of a gear to be ground, and FIG. 10B shows a spiral stripe. It is a partial schematic cross-section explanatory drawing which shows the example which meshes to the vicinity of a tooth bottom part, and grinds, moving a cutting table back.

FIG. 11 is an explanatory diagram showing the relationship between the amount of movement of the gear to be ground in the direction of arrow B and the phase when performing crowning grinding.

FIG. 12A is a schematic explanatory view showing a state in which a gear to be ground is subjected to crowning grinding, and FIG. 12B is
FIG. 12C is a schematic explanatory view showing a state in which a helical gear is subjected to crowning grinding, and FIG. 12C is a schematic explanatory diagram showing a state in which an irregularly shaped crowning grinding is performed.

FIG. 13 is a schematic explanatory view showing movement trajectories of a cutting table and a traverse table when performing crowning grinding.

FIG. 14A is a partial schematic cross-sectional explanatory view showing the shapes of a spiral strip and a gear to be ground of a gear grinding tool according to a conventional technique, and FIG. 14B is a partial schematic view showing a grinding state in the conventional technique. FIG.

FIG. 15 is a schematic front view showing a state in which a helical gear is ground according to a conventional technique.

[Explanation of symbols]

10 ... Gear grinding device 12 ... Bed 14 ... Cutting table 16 ... Cutting motor 18 ... Traverse table 20 ... Traverse motor 22 ... Gear to be ground 23 ... Teeth 23a ... Tooth grooves 23b, 23c ...
Tooth surface 23d ... Tooth bottom 24 ... Tooth tip detection sensor 26 ... Work spindle motor 30 ... Turning table 32 ... Shift table 38 ... Tool spindle motor 42 ... Gear grinding tool 43 ... Helical strip 60 ... Controller 60a ... Rotation phase controller 76 ... Input device

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Naoki Iwasa             1-10-1 Shinsayama, Sayama City, Saitama Prefecture             Engineering Co., Ltd. (72) Inventor Tatsuya Ito             1-10-1 Shinsayama, Sayama City, Saitama Prefecture             Engineering Co., Ltd.

Claims (6)

[Claims] 1. A first motor rotates a gear to be ground, a second motor rotates a gear grinding tool in synchronism with the gear to be ground, and a spiral strip of the gear grinding tool is rotated to the gear to be ground. And the gear to be ground is moved in the axial direction and the phase between the gear to be ground and the gear grinding tool is changed, so that the spiral tooth causes the left tooth of the tooth of the gear to be ground. A gear grinding method, characterized in that either one of the face and the right flank is ground. 2. The gear grinding method according to claim 1, wherein after grinding either the left side tooth surface or the right side tooth surface, the phase is reversed with respect to the center of the tooth groove. Alternatively, a gear grinding method is characterized in that an unground tooth surface of the right tooth surface is ground. 3. The gear grinding method according to claim 1, wherein the operation of moving the gear to be ground in the axial direction and the operation of bringing the gear to be ground and the gear grinding tool close to each other are cooperated. Then, the tooth of the gear to be ground is subjected to crowning grinding. 4. The gear grinding method according to claim 1, wherein an operation of moving the gear to be ground in the axial direction and the phase of the gear to be ground and the gear grinding tool. Is changed to perform crowning grinding on the teeth of the gear to be ground. 5. The gear grinding method according to any one of claims 1 to 4, wherein the thickness of the spiral stripe of the gear grinding tool does not come into contact with the left tooth surface and the right tooth surface. A gear grinding method, characterized in that the thickness is such that it can reach the tooth root. 6. A first motor for rotating a gear to be ground about an axis, a gear grinding tool for grinding teeth of the gear to be ground, and a rotation of the gear grinding tool about an axis. A second motor, a cutting mechanism that relatively moves the gear to be ground and the gear grinding tool back and forth, a traverse mechanism that moves the gear to be ground forward and backward in the axial direction, and the first and second A second motor rotates the gear to be ground and the gear grinding tool at a synchronous speed,
A gear grinding device, comprising: a rotation phase control unit that controls the phases of the gear to be ground and the gear grinding tool while performing the advancing / retreating operation of the traverse mechanism.