JP2001129630A - Gear cutting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a high-accuracy tooth profile in a short time, using a rollers of different shapes. SOLUTION: A rough forming roller 41 and finishing forming roller 42 are rotatably supported in a copying blacket 20 to be arranged in serial and rotate in the direction along with the trace of a tooth profile to be formed on a work W. When a finish forming is applied on the work roughly formed by the rough forming roller 41, the processing roller is changed from rough forming roller 41 to the finishing forming roller 42 by operating a transmitting mean of a ball screw structure 13. In changing the rough forming roller to the finish forming roller, the installation on removal of the rough forming roller 41 and the finish forming roller 42 are not required with relation for the copying blacket 20 as compared with a conventional apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tooth forming apparatus for forming a tooth profile by plastically deforming a work by a forming roller. Here, the “tooth shape” is not limited to the gear tooth shape, but includes a linear or curved groove shape formed on a work.

[0002]

2. Description of the Related Art The present applicant has invented a tooth forming method and a forming apparatus for forming a tooth shape by plastically deforming a work by a forming roller, and discloses the details thereof in Japanese Patent Application No. 11-42997. ing.

FIG. 6 shows an overall view of the conventional molding apparatus. The tooth forming apparatus includes a forming roller 1 for forming a tooth profile on a surface of a work W, a positioning unit 2 for positioning a support portion supporting the forming roller 1 in a radial direction of the work W, and forming the support portion. The apparatus includes feed means 3 for feeding along a tooth trace of a desired tooth profile, and vibrating means 4 for vibrating the supporting portion in the feed direction (Z direction) of the feed means 3. The positioning means 2 is for positioning the plurality of forming rollers 1 all on the same circumference. Further, the vibrating means 4 can synchronously vibrate each forming roller 1 as described below.

A supporting rod 11 is provided upright at a corner of a base 10 of the tooth forming apparatus, and a base block 12 is supported on an upper end of the supporting rod 11. In addition, the feeding means 3 extends below the base block 12.
Is provided, and a servo motor 14 for driving the ball screw mechanism 13 is mounted on the upper surface of the base block 12. The vibration means 4 can be moved up and down in the Z direction by being attached to the tip of the ball screw mechanism 13. Note that the vibrating means 4 is configured by an actuator such as a hydraulic vibrator, and a plate 4 a for applying vibration in the feed direction (Z direction) to the forming roller 1 is provided on the lower surface.

[0005] On the lower surface of the plate 4a, four copying brackets 20 (support portions), which are support portions for rotatably supporting the forming roller 1, are provided at 90 ° intervals with respect to the center of the work W. Each is provided movably in the radial direction (X direction). Further, the positional accuracy in the circumferential direction of each copying bracket 20 is ensured by the mounting accuracy with respect to the lower surface of the plate 4a.

The outer periphery of the forming roller 1 is formed in a sectional shape corresponding to the shape of the tooth valley (internal teeth) of the tooth shape to be formed on the work W. On the other hand, as shown in FIG. 7, a mandrel 21 (indexing shaft) having a tooth profile similar to the tooth profile to be formed is rotatably provided substantially at the center of the base 10. The mandrel 21 is driven to rotate around an axis (R direction) at a desired angle by a servomotor 22 (FIG. 6) provided in the base 10. The work W is placed on the upper surface of the mandrel 21, and the work W is pressed onto the mandrel 21 by a clamper 23 supported by an elevating shaft that penetrates the vibrating means 4, and the work W is placed on the mandrel 21.
Can be fixed.

A cam mechanism shown in FIG. 7 is provided on the base 10 as positioning means 2 for positioning the forming roller 1 in the radial direction. The cam mechanism is provided with a positioning cam 30 slidably in contact with each of the scanning brackets 20 and movable in a radial direction (X direction) with respect to the rotation center of the mandrel 21 (the center of the work W).
And a wedge-shaped cam 31 that slides on the outer surface of each wedge-shaped cam 31 in the radial direction (X direction).
Guided by. Note that a reinforcing ring 33 is externally fitted to each fixing bracket 32.

Each of the wedge-shaped cams 31 is connected to a nut member 34. The nut member 34 has a trapezoidal screw formed on the inner periphery thereof, and is screwed with a trapezoidal screw formed on the outer periphery of the rotating member 35. The rotating member 35 is
It is rotatably supported about a rotation axis substantially coaxial with the rotation axis of the mandrel 21.
5a is provided. The base 1 is attached to the gear portion 35a.
A relatively small-diameter gear 37, which is rotationally driven by a servo motor 36 (FIG. 6) provided in the gear 0, is meshed.
For this reason, the driving force of the servomotor 36 is reduced by the gear 37 and the gear portion 35 a and transmitted to the rotating member 35. Then, as the rotating member 35 rotates, the nut member 34 screwed to the rotating member 35 is moved up and down in the Z direction, and each wedge-shaped cam 31 coupled to the nut member 34 is moved.
Are simultaneously moved up and down by the same amount. Then, the positioning cam 30 slidingly contacting each wedge-shaped cam 31 is moved in the radial direction (X
Direction) pushed inward. As a result, the forming roller 1 of each of the copying brackets 20 slidingly contacting the positioning cam 30 is formed.
Is changed and adjusted at the same time by the same amount.

According to the above-described apparatus, the Z-direction vibration of the vibrating means 4 is combined with the Z-direction feeding operation of the forming roller 1 by the ball screw mechanism 13 as the feeding means 3, and the forming roller 1 Thus, a continuous reciprocating hammering action can be applied to the work W. Therefore, plastic deformation occurs intermittently in the work W as shown in FIG.
A desired tooth profile is formed while reducing the load when feeding the forming roller 1.

[0010]

In order to further improve the accuracy of the tooth profile in the above-mentioned conventional molding device, after forming the tooth profile on the work W by the molding roller 1, the finishing process is further performed by the finish molding roller. There is also. At this time, in the conventional apparatus, when shifting from the process using the forming roller 1 to the process using the finishing roller, the scanning roller 20 supporting the forming roller 1 is moved from the forming bracket 20 to the forming roller 1.
Had to be removed and a new finishing roller had to be installed. In addition, the autochanger mechanism that automates the work of attaching and detaching the rollers is a complicated and large-scale device,
In addition, it takes a lot of time to complete the attachment and detachment.

In order to eliminate the trouble of attaching and detaching the rollers as described above, the forming roller 1 and the finishing roller may be set in separate forming apparatuses, and the two processing steps may be shared by the respective forming apparatuses. Although it is possible, a separate transfer device for transferring the work between the two devices is required, and the processing time is extra for the time of the transfer. In addition, there is a possibility that the accuracy error between the processes affects the tooth profile accuracy of the product.

In the above-described conventional molding apparatus, the positional accuracy of each scanning bracket 20 in the circumferential direction is secured by the mounting accuracy with respect to the lower surface of the plate 4a.
The positioning accuracy of 0 in the radial direction is ensured by the positioning cam 30 and the wedge cam 31 guided by the fixed bracket 32. That is, the positioning reference of the copying bracket 20 is different between the circumferential direction and the radial direction, and the configuration of the apparatus is complicated, and it is difficult to obtain the accuracy of the copying bracket 20.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a tooth forming apparatus for forming a tooth profile by plastically deforming a work by a forming roller, using rollers having different shapes. Therefore, a highly accurate tooth profile can be obtained in a short time.

[0014]

According to a first aspect of the present invention, there is provided a tooth forming apparatus for forming a tooth profile on a workpiece fixed to an indexing shaft, and a support for supporting the roller. Part, positioning means for radially positioning the support part, feed means for feeding the support part along the tooth trace of the tooth shape to be formed, and vibration means for vibrating the support part in the feed direction by the feed means. And a roller for rough forming and a roller for finish forming, which are arranged in series in a direction along the tooth traces.

In the present invention, when plastically forming a tooth profile on a work, the rough forming roller supported by the support portion positioned in the radial direction by the positioning means is pressed against the work and formed by the feed means. The tooth profile is formed on the workpiece by feeding along the tooth trace of the tooth profile to be formed. At this time, the vibration in the feeding direction applied from the vibrating means is combined with the moving operation by the feeding means to give a continuous reciprocating hammering action to the work from the rough forming roller. As a result, an intermittent plastic deformation is generated in the work, and a load on the rough forming roller when forming a desired tooth profile, and further, a supporting portion for supporting the roller and other components of the device To reduce the load on

Subsequently, by the above-mentioned finish forming roller,
Finish processing is applied to the tooth profile portion of the workpiece that has been roughly formed. At this time, the feed means moves the rough-forming roller and the finish-forming roller arranged in series in the direction along the tooth streak to a position where it can be brought into contact with the tooth-shaped portion of the work. Thereafter, the tooth profile finishing is performed in the same manner as in the case of the rough forming roller.

The tooth forming apparatus according to a second aspect of the present invention is provided with a plurality of types of rollers for forming different tooth profiles, instead of the rough forming roller and the finish forming roller. . Then, by moving the plurality of types of rollers by the feeding means, a plurality of tooth shapes are formed by one tooth forming apparatus.

Further, the tooth shaping device according to claim 3 of the present invention has a function of positioning the support portion in the circumferential direction.
The positioning means is provided. According to this configuration,
Since the positioning of the support portion in any of the radial direction and the circumferential direction is performed by the positioning device, a structure and a reference position for performing accurate positioning can be collected in the positioning device.

In the tooth forming apparatus according to a fourth aspect of the present invention, the drive mechanism of the positioning means is disposed radially outward with respect to the support portion. According to this configuration, since the support portion is located inside the drive mechanism of the positioning means, the length of the support portion is extended even if the rollers are arranged in series in a direction along the tooth trace. In addition, the length of the device as a whole in the direction along the tooth traces can be stored compactly.

In addition, in the tooth forming device according to a fifth aspect of the present invention, the drive mechanism of the positioning means is separated from the circulation path of the working coolant. Therefore,
It is possible to prevent a problem caused by dust or the like mixed in the processing coolant entering the drive mechanism of the positioning means.

[0021]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, the same or corresponding parts as those of the prior art are denoted by the same reference numerals, and detailed description is omitted.

FIG. 1 shows a main part of a tooth shaping apparatus according to an embodiment of the present invention. This device includes a rough forming roller 41 as a roller for forming a tooth profile on a work W fixed to a mandrel 21 (indexing shaft).
And a roller 42 for finish molding. These rollers 41 and 42 are rotatably supported by the copying bracket 20 (supporting portion) in a state where the rollers 41 and 42 are arranged in series in the direction along the tooth trace of the tooth shape to be formed on the workpiece W.

Also in the embodiment of the present invention, the four copying brackets 20 (support portions) are positioned 90 degrees with respect to the center of the workpiece W.
They are provided movably in the radial direction (X direction) at intervals of degrees. In order to enable such movement in the radial direction (X direction), each copying bracket 20 is
Is attached to the plate 4a via a linear slider or the like. In the tooth shaping apparatus according to the present embodiment, the positioning accuracy of each scanning bracket 20 in the circumferential direction is ensured by a slider portion 45 described later, and a gap between the plate 4a and the scanning bracket 20 in the circumferential direction is provided. Has some play.

The plate 4a is fixed to the slider 43 via the vibration means 4, and the end of the plate 4a is slidably supported by the slider 43 by the slide rod 44. The slider 43 is a support rod 1
1 is slidably engaged with a member penetrating up and down, and a top end of a ball screw mechanism 13 is connected to the upper surface thereof.

The positioning cam 30 and the wedge-shaped cam 31 on the base 10 are positioned in the circumferential direction by a slider 45 provided on the fixed bracket 32, and the copying bracket 20, that is, the rough forming roller 41 and the finishing It constitutes a positioning means for positioning the molding roller 42 in the radial direction. Further, the slider portion 45 includes a guide 45a, and when the scanning bracket 20 moves down and engages with the positioning cam 30 as described later, the guide 45a supports the side surface of the scanning bracket 20 as shown in FIG. The positioning of the bracket 20 in the circumferential direction can also be performed.

Also, as shown in FIG.
The nut member 34 with which the nut 1 engages is formed with a trapezoidal screw on the outer periphery thereof, and a rotating member 35 that is screwed with the trapezoidal screw is disposed further radially outside the nut member 34. A gear portion 35 a is provided on the outer periphery of the lower end of the rotating member 35, and can be driven by the gear 37. The gear 37 is driven to rotate by a servomotor 36 (FIG. 6) provided in the base 10, as in the conventional example.
A cavity 46 is formed between the mandrel 21 and the fixing bracket 32, and the copying bracket 20 is formed for processing.
Is moved down, the copying bracket 20 fits into the cavity 46. In addition, a coolant recovery port 47 is provided on the bottom surface of the cavity 46.

The procedure for forming a tooth profile on the workpiece W by the tooth forming device according to the embodiment of the present invention is as follows. First, the work W is placed on the mandrel 21 as shown in FIG. Subsequently, as shown in FIG. 3, the clamper 23 supported by the elevating shaft 23a penetrating the vibrating means 4.
Then, the work W is pressed on the mandrel 21.

Next, the slider 43 is lowered by the operation of the ball screw mechanism 13 (FIG. 1), and as shown in FIG.
Sliding surface 30a of positioning cam 30 and copying bracket 20
The copying bracket 20 is lowered to a position where the sliding bracket 20 a comes into contact with the sliding surface 20a. Subsequently, the servomotor 36 is driven to raise the nut member 34 to a predetermined position, and the wedge-shaped cam 31 pushes the positioning cam 30 inward in the radial direction. Then, the sliding surface 30a of the copying bracket 20 is moved by the sliding surface 30a of the positioning cam 30 pushed in.
Is pushed inward in the radial direction to approach the work W.

Further, as shown in FIG. 4A, the copying bracket 20 is lowered so that the rough forming roller 41 is positioned above the work W and the finish forming roller 42 is positioned below the work W. Let it.

Then, the nut member 34 (FIG. 1) is further raised, and the positioning cam 30 and the copying bracket 20 are moved.
Inward in the radial direction, and the rough forming roller 41 is
It is set to a predetermined drive position for the work W.
At the same time or back and forth, the servo motor 22 (see FIG. 6) is driven to rotate the mandrel 21 in the R direction so that the rough forming roller 41 faces a predetermined position in the circumferential direction of the work W. And set.

Then, the hydraulic exciter 4 (FIG. 1) is started to apply vibration in the Z direction to the rough forming roller 41 which is supported by the copying bracket 20 via the plate 4a.
The ball screw mechanism 13 is driven by the servomotor 14 (FIG. 1), and the side surface of the work W is pressed downward from above by the roughing roller 41 as shown in FIG. . At this time, the rough shaping of the desired tooth profile is completed by applying a continuous reciprocating hammering action to the workpiece W from the rough shaping roller 41.

Subsequently, the finish forming roller 42 finishes the tooth profile of the workpiece after the rough forming is completed. At this time, the ball screw mechanism 13 is operated to
As shown in (c), the slider 43 (FIG. 1) is raised so that the finish forming roller 42 is located above the work W. Then, the nut member 34 is raised again, and the positioning cam 30 and the copying bracket 20 are pushed inward in the radial direction.
Is set to a predetermined run-in position. Subsequently, the hydraulic exciter 4 is started, and while applying vibration in the Z direction to the finish forming roller 42 supported by the copying bracket 20 via the plate 4a (FIG. 1), the ball screw mechanism 13 is servo-controlled. It is driven by a motor 14 (FIG. 1). Then, the finish forming roller 42 is moved to the position shown in FIG.
To finish the tooth profile.

FIG. 5A shows a rough forming roller 41, a mandrel 21 and a work W during rough forming of a tooth profile.
Is shown in a sectional view. FIG. 5B is a cross-sectional view illustrating the relationship between the finish forming roller 42, the mandrel 21, and the work W during the finish forming of the tooth profile. As shown in the figure, on the outer peripheral surface of the rough forming roller 41, an uneven shape corresponding to the tooth groove of the tooth shape to be formed is formed over the entire circumference, and the uneven shape formed on the outer circumferential surface of the mandrel 21 is formed. By pinching the workpiece W between the workpieces, a tooth profile is formed. However, there is a possibility that the tooth profile formed by the rough forming roller 41 may vary within a certain allowable range. Therefore,
The tip of the external teeth is pressed in the radial direction between the mandrel 21 and the mandrel 21 by a finish forming roller 42 having a concave round shape formed over the entire circumference. Such pressing not only corrects the variation of the tooth tip, but also causes the material of the tooth tip to flow radially to the tooth surface and the material of the tooth surface to flow to the tooth space, thereby improving the molding accuracy. In particular, mandrel 21
The material is sufficiently filled in accordance with the shape of the groove for forming the internal teeth portion of the work W, and the improvement of the forming accuracy becomes remarkable.

During the rough forming and the finish forming, the working coolant supplied between the rough forming roller 41 and the finish forming roller 42 and the workpiece W (worked portion) is supplied to the bottom surface of the cavity 46. Coolant recovery port 4 provided in
7 (FIGS. 1 and 3), the mixed dust is removed by a filter or the like, and then supplied to the processing portion again.

The operation and effect obtained from the embodiment of the present invention having the above configuration are as follows. The tooth forming apparatus according to the embodiment of the present invention includes a rough forming roller 41 and a finish forming roller 42 on the copying bracket 20 (support portion).
Are rotatably supported in a state where they are arranged in series in the direction along the tooth trace of the tooth profile to be formed on the work W. Therefore, when the finish forming is performed on the tooth profile portion of the work on which the rough forming is completed, the roller to be used for processing is changed from the rough forming roller 41 to the finish forming roller only by operating the ball screw mechanism 13 which is a feeding means. The roller 42 can be changed.

Thus, unlike the conventional apparatus, when changing from the rough forming roller to the finish forming roller, it is not necessary to use the autochanger mechanism, and it is not necessary to adjust the assembling accuracy after the roller is attached and detached. Also improves the maintainability. Also, there is no need to share the two processing steps with the respective molding devices, and a transfer device for transferring the work between the two devices is not required. In addition, there is no possibility that the accuracy error between products is affected and the tooth profile accuracy of the product is deteriorated. As described above, according to the tooth forming apparatus according to the embodiment of the present invention, it is possible to obtain a highly accurate tooth profile by performing two steps of rough forming and finish forming, and from the rough forming roller. It is possible to easily change to a roller for finish molding and obtain a highly accurate tooth profile in a short time.

In the apparatus according to the present embodiment, the positioning accuracy of the scanning bracket 20 in the circumferential direction is controlled by the guide 45 a of the slider 45 provided on the fixed bracket 32.
Secured by. In other words, the slider 45,
The fixed bracket including the guide 45a has a function of positioning the copying bracket 20 in the circumferential direction. By the way, the slider portion 45 of the fixed bracket 32 also functions as positioning means for positioning the copying bracket 20 in the radial direction in cooperation with the positioning cam 30 and the wedge-shaped cam 31, so that the slider portion 45 in the circumferential direction of the copying bracket 20 and The structure and the reference position for performing the positioning in the radial direction are put together in the fixed bracket 32. Therefore, the configuration of the apparatus is simplified, the number of steps required for assuring the accuracy when assembling each part is reduced, and the accuracy of the copying bracket 20 can be easily ascertained.

Further, a positioning cam 30 and a wedge-shaped cam 31 which are means for positioning the scanning bracket 20 in the radial direction.
Drive mechanism (nut member 34, rotating member 35, gear portion 3)
By arranging 5a and the gear 37) radially outward with respect to the copying bracket 20, a cavity 46 can be formed between the mandrel 21 and the fixed bracket 32. Then, when the copying bracket 20 is lowered for processing, the copying bracket 20 can be stored in the hollow portion 46. Therefore, the conventional bracket (see FIGS. 6 and 7) results from the provision of two rollers, the rough forming roller 41 and the finish forming roller 42, on the copying bracket 20.
Even if the length of the copying bracket 20 is extended as compared with the above, the length in the direction along the tooth traces of the entire apparatus can be stored compactly.

Further, the drive mechanism of the positioning means for the scanning bracket 20 in the radial direction is disposed radially outward with respect to the scanning bracket 20, and the bottom surface of the hollow portion 46 formed between the mandrel 21 and the fixed bracket 32. Is provided with a coolant recovery port 47 to isolate the drive mechanism (34, 35, 35a, 37, etc.) of the positioning means 2 from the circulation path of the machining coolant. Therefore, it is possible to prevent a problem caused by dust or the like mixed in the machining coolant entering the driving mechanism of the positioning means 2. Therefore, the reliability of the tooth forming device can be improved.

The distance between the rough forming roller 41 and the finish forming roller 42 of the copying bracket 20 is the minimum distance that the other roller does not come into contact with the workpiece W when processing is performed by one roller. Therefore, it is desirable to minimize the length of the copying bracket 20.
Further, in the embodiment of the present invention, the diameters of the rough forming roller 41 and the finish forming roller 42 are shown as the same diameter, but the finish forming roller 42 having a small forming load is used.
Can be made smaller in diameter than the rough forming roller 41 so that the tip of the copying bracket 20 can be made more compact.

In this embodiment, the rough forming roller 41 having a large forming load is provided near the base end (upper end) of the copying bracket 20, so that the rough forming roller 41 is applied to the copying bracket 20 and the plate 4a during the rough forming. Conversely, if the finish forming roller 42 is provided above the copying bracket 20 and the rough forming roller 41 is provided below the copying bracket 20, the moment by the rough forming roller 41 is reduced. Continuing with the descending operation of the copying bracket 20 for molding, it is possible to perform finish molding by the finish molding roller 42.

Further, if the copying bracket 20 is provided with a plurality of types of rollers for forming mutually different tooth shapes instead of the rough forming roller 41 and the finish forming roller 42, the tooth shapes of a plurality of shapes can be obtained. Can be formed by one tooth forming device.

[0043]

According to the present invention, the following effects are obtained. First, according to the invention according to claim 1 of the present invention, in a tooth forming apparatus for forming a tooth profile by plastically deforming a workpiece by a forming roller, a roller having a different shape is used to quickly form a highly accurate tooth profile. It is possible to obtain in.

Further, according to the invention of claim 2 of the present invention, it is possible to form two differently shaped tooth profiles with one tooth forming device.

Further, according to the third aspect of the present invention, the number of man-hours required for assembling each component at the time of assembling can be reduced and the accuracy of the roller can be easily ascertained.

According to the invention according to claim 4 of the present invention, the length of the device as a whole in the direction along the tooth trace can be stored compactly while the support portion has two rollers. .

In addition, according to the invention of claim 5 of the present invention, it is possible to prevent a problem caused by dust or the like mixed in the machining coolant entering the driving mechanism of the positioning means, and to improve the reliability of the machining apparatus. Can be increased.

[Brief description of the drawings]

FIG. 1 shows a main part of a tooth shaping device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view passing through the center axis of a rough forming roller when the copying bracket is lowered and engaged with a positioning cam.

FIG. 3 is a sectional view of a main part of the tooth forming apparatus, showing a procedure for forming a tooth profile on a workpiece by the tooth forming apparatus according to the embodiment of the present invention.

FIG. 4 is a diagram showing a procedure for performing rough forming and finish forming of a tooth profile on a workpiece by the tooth forming device according to the embodiment of the present invention;
It is explanatory drawing shown in each step of (a), (b), (c).

5A is a sectional view showing a relationship between a roller for rough forming, a mandrel, and a work, and FIG. 5B is a sectional view showing a relationship between a roller for finish forming, a mandrel, and a work. Is shown.

FIG. 6 is an overall view of a conventional tooth forming device.

FIG. 7 is a sectional view of a main part of the tooth forming device shown in FIG. 6;

8 is a graph illustrating the movement of the forming roller in the Z-axis direction and the forming amount of the formed tooth profile in the tooth forming apparatus illustrated in FIG. 6;

[Explanation of symbols]

 2 Positioning Means 3 Feeding Means 4 Vibration Means 4a Plate 12 Base Block 13 Ball Screw Mechanism 14 Servo Motor 20 Copying Bracket 21 Mandrel 30 Positioning Cam 31 Wedge Cam 32 Fixed Bracket 34 Nut Member 35 Rotating Member 35a Gear 37 Gear 41 Rough Forming roller 42 Finish forming roller 45 Slider 45a Guide 47 Coolant recovery port

Claims (5)

[Claims] 1. A roller for forming a tooth profile on a workpiece fixed to an indexing shaft, a support for supporting the roller, positioning means for positioning the support in a radial direction, and a tooth profile for forming the support. Feeding means for feeding along the tooth traces of
Vibrating means for vibrating the support portion in a feeding direction of the feeding means, wherein the rollers are arranged in series in a direction along the tooth streak, and a roller for rough forming and a roller for finish forming are provided. And a tooth forming device. 2. A tooth forming apparatus according to claim 1, further comprising a plurality of types of rollers for forming mutually different tooth profiles, in place of said rough forming roller and said finish forming roller. . 3. The tooth forming apparatus according to claim 1, wherein the positioning means has a function of positioning the support portion in a circumferential direction. 4. The tooth forming apparatus according to claim 1, wherein a driving mechanism of the positioning means is arranged radially outward with respect to the support portion. 5. The tooth forming apparatus according to claim 1, wherein a drive mechanism of said positioning means is isolated from a circulation path of a machining coolant.