JP2007167888A - Method and device for molding tooth profile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for molding tooth profiles, which totally miniaturize the device, by reducing the maximum molding load applied on the entire device when molding a plurality of tooth profiles extending on the outer peripheral wall of a raw material in the axial direction of the material, in the circumferential direction of the material. <P>SOLUTION: The tooth profile molding device 1 has a plurality of roller composites 8a, 8a', which are radially arranged to mold a plurality of tooth profiles extending on an outer peripheral wall 3 of a raw material 10a in the axial direction of the raw material 10a. The plurality of roller composites 8a, 8a' are mutually offset in the moving direction of the raw material 10a. Thereby, when molding a plurality of tooth profiles on the outer peripheral wall 3 of the raw material 10a, each of the plurality of the tooth profiles is successively molded on the outer peripheral wall 3 of the raw material 10a by each of the roller composites 8a, 8a', which are mutually offset. By the successive molding of the tooth profiles, the maximum molding load applied on the entire tooth profile molding device 1 is reduced, so that the device 1 is miniaturized. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tooth forming method and a tooth forming device for forming a plurality of axially extending tooth shapes in the circumferential direction on the outer peripheral wall of a rough material of a clutch drum used as a part of an automatic transmission of an automobile, for example. is there.

  As shown in FIG. 4, a clutch drum 10 used as a part of an automatic transmission for an automobile is formed in a bottomed cylindrical shape, and a plurality of teeth 2 and 2 extending in the axial direction are formed on the outer peripheral wall 3 in the circumferential direction. ing. In the manufacturing process of the clutch drum 10, there is a step of forming a plurality of teeth 2 and 2 extending in the circumferential direction in the circumferential direction on the outer peripheral wall 3 of the coarse material 10a formed into a bottomed cylindrical shape by sheet metal or the like.

Therefore, a conventional tooth forming apparatus that forms a plurality of tooth shapes 2 and 2 extending in the axial direction on the outer peripheral wall 3 of the coarse material 10a in the circumferential direction will be described with reference to FIG.
A conventional tooth forming device 50 is attached to a reciprocating portion of a press machine (not shown), and a plurality of mandrels 5 in which the inner peripheral wall of the coarse material 10 a is mounted on the outer peripheral surface 6 and a plurality of radial arrangements around the mandrels 5. Thus, the roller 10 is composed of rotatable rollers 8 and 8 for forming a plurality of tooth shapes 2 and 2 extending in the axial direction on the outer peripheral wall 3 of the coarse material 10a.

The mandrel 5 is formed in a substantially cylindrical shape, and a plurality of grooves 7 and 7 extending in the axial direction are formed on the outer peripheral surface 6 in the circumferential direction. The bottomed cylindrical coarse material 10a is mounted so as to cover the outer peripheral surface 6 from the bottom surface of the mandrel 5, and the grooves 7 and 7 provided on the outer peripheral surface 6 of the mandrel 5 It arrange | positions so that a surrounding wall may oppose.
Each roller 8 is substantially circular, and a tooth profile protrusion 9 for forming the tooth profiles 2 and 2 on the outer peripheral wall 3 of the coarse material 10a is formed on the entire peripheral surface thereof. A plurality of these rollers 8, 8 are radially arranged in a top view and supported by a holder 15. The holder 15 is formed of a substantially cylindrical block body, and each of the rollers 8 and 8 is rotatably supported on the shafts 16 and 16 so that a part of each peripheral surface protrudes into the internal space 15 a of the holder 15. Has been. These rollers 8 and 8 are arranged on the same plane with respect to the holder 15.

  When a plurality of tooth profiles 2 and 2 extending in the axial direction are formed on the outer peripheral wall 3 of the coarse material 10a in the circumferential direction, the mandrel 5 attached to the press machine is connected to the outer peripheral surface 6 of the inner peripheral wall of the coarse material 10a. Is passed through the internal space 15 a of the holder 15. Then, the tooth profile projections 9 and 9 of all the rollers 8 and 8 are simultaneously in contact with the outer peripheral wall 3 of the coarse material 10a, and the tooth profile projections 9 and 9 of all the rollers 8 and 8 are coarsely rotated while freely rotating. A portion of the outer peripheral wall 3 of the material 10 a facing the rollers 8, 8 is pushed into the grooves 7, 7 provided on the outer peripheral surface 6 of the mandrel 5. As a result, the clutch drum 10 is manufactured in which a plurality of tooth shapes 2 and 2 extending in the axial direction are formed on the outer peripheral wall 3 of the coarse material 10a in the circumferential direction.

As a prior art of such a tooth forming apparatus for forming a plurality of tooth shapes extending in the axial direction on the outer peripheral wall of the rough material, in Patent Document 1, a plurality of uneven portions extending in the axial direction are formed, The outer peripheral wall of the sheet metal drum has an outer peripheral surface mounted around it, a punch that can move in the axial direction, and a part of each punch can be inserted into each recess. Each roller arranged and rotatable along each recess of the punch, and when the punch is made to make one stroke, each roller rotates while pushing the outer peripheral wall of the sheet metal drum into each recess of the punch. Accordingly, it is disclosed that a plurality of tooth shapes extending in the axial direction are formed on the outer peripheral wall of the sheet metal drum in the circumferential direction.
JP-A-9-1279

  However, in the conventional tooth forming apparatus shown in FIG. 5 and the tooth forming apparatus according to the invention of Patent Document 1, when the outer peripheral wall of the coarse material is pushed into each recess provided on the outer peripheral surface of the punch by each roller, Since the rollers are arranged on the same plane, each roller, specifically, the sliding surface with each shaft of each roller, receives a reaction force from the coarse material. A molding load corresponding to the product of the load received by the roller and the quantity of each roller acts. That is, in the conventional tooth forming apparatus shown in FIG. 5 and the tooth forming apparatus according to the invention of Patent Document 1, since the rollers are arranged on the same plane with respect to the holder, the punch moves and the coarse material When forming a plurality of tooth profiles on the outer peripheral wall, all the rollers will simultaneously receive a reaction force from the coarse material, and the maximum molding load acting on the entire apparatus will increase, and this maximum molding load can be accommodated. A device having the capacity is increased in size.

  In addition, in the conventional tooth forming apparatus shown in FIG. 5 and the tooth forming apparatus according to the invention of Patent Document 1, the outer peripheral wall of the coarse material receives an axial load from each roller at the same time. Elongation in the axial direction is promoted, and the overhang of the material on the top of each tooth profile is insufficient.

  The present invention has been made in view of such points, and when forming a plurality of tooth shapes extending in the axial direction on the outer peripheral wall of the coarse material in the circumferential direction, the maximum molding load acting on the entire device is reduced, and the entire device An object of the present invention is to provide a tooth forming method and a tooth forming device capable of reducing the size of the device.

According to the present invention, as a means for solving the above-mentioned problems, the tooth forming method according to claim 1 is characterized in that a plurality of rollers for forming one tooth shape per roller are radially arranged on the outer peripheral wall of the coarse material. In the tooth forming method of forming a plurality of tooth shapes extending in the axial direction on the outer peripheral wall of the coarse material by moving the support body on which the coarse material is mounted in the axial direction, A plurality of tooth shapes extending in the axial direction are sequentially formed on the outer peripheral wall of the rough material by rollers offset from each other.
According to a second aspect of the invention of the tooth forming method, in the first aspect of the invention, the rollers are alternately offset and arranged.
According to a third aspect of the invention of the tooth forming method, in the first aspect of the invention, the rollers are sequentially offset and arranged.
According to a fourth aspect of the present invention, there is provided a tooth forming method according to the first aspect, wherein each of the radially arranged rollers is divided into a plurality of rollers, and each of the divided rollers is moved by the coarse material. They are characterized by being offset from each other in the direction.

Further, in order to solve the above-mentioned problem, the invention of the tooth forming apparatus according to claim 5 is the tooth forming apparatus for forming a plurality of tooth forms extending in the axial direction on the outer peripheral wall of the rough material. The molding apparatus includes a plurality of grooves extending in the circumferential direction on the outer circumferential surface, and a support body having an inner circumferential wall of the rough material mounted on the outer circumferential surface and movable in the axial direction. And a plurality of rotatable rollers that are radially arranged around the outer peripheral wall of the coarse material and press the outer peripheral wall of the coarse material into the groove portions of the support, and the rollers are arranged offset from each other in the moving direction of the coarse material. It is characterized by that.
The invention of the tooth forming apparatus according to claim 6 is the invention according to claim 5, wherein each of the rollers is configured by providing a plurality of roller composites in which a plurality of rollers are arranged concentrically at intervals. The roller composites are arranged so as to be offset from each other in the moving direction of the coarse material.
According to a seventh aspect of the present invention, there is provided the tooth forming apparatus according to the fifth aspect, wherein in each of the radially arranged rollers, adjacent rollers are offset from each other in the moving direction of the coarse material. It is characterized by that.

Therefore, in the invention of the tooth forming method according to claim 1, since the rollers are arranged offset with respect to the moving direction of the coarse material, when the support body holding the coarse material is moved in the axial direction, A plurality of teeth extending in the axial direction are sequentially formed on the outer peripheral wall of the coarse material by the rollers offset from each other. As a result, when a plurality of tooth shapes extending in the axial direction are formed in the circumferential direction on the outer peripheral wall of the coarse material, the rollers arranged offset from each other receive a reaction force sequentially from the coarse material. Therefore, the molding load acting at the time of tooth forming is dispersed without receiving the reaction force at the same time, and the maximum molding load acting on the entire tooth forming device is reduced.
In the invention of the tooth forming method according to the second to fourth aspects, the forming load acting at the time of the tooth forming shape is dispersed, and the maximum forming load acting on the entire tooth forming device is reduced.

In the tooth forming apparatus according to the fifth aspect of the present invention, since the rollers are offset from each other in the direction of movement of the coarse material, the support is moved with the coarse material attached to the outer peripheral surface thereof. Then, the outer peripheral wall of the coarse material is sequentially pushed into the grooves of the support by the rollers offset from each other, and a plurality of tooth shapes extending in the axial direction are sequentially formed. As a result, when a plurality of tooth shapes extending in the axial direction are formed in the circumferential direction on the outer peripheral wall of the coarse material, the rollers arranged offset from each other receive a reaction force sequentially from the coarse material. Therefore, the molding load acting at the time of tooth forming is dispersed without receiving the reaction force at the same time, and the maximum molding load acting on the entire apparatus is reduced.
In the invention of the tooth forming apparatus according to the sixth and seventh aspects, the forming load acting at the time of tooth forming is dispersed, and the maximum forming load acting on the entire apparatus is reduced.

  According to the present invention, when a plurality of tooth shapes extending in the axial direction are formed on the outer peripheral wall of the coarse material in the circumferential direction, the tooth shape capable of reducing the maximum forming load acting on the entire device and reducing the size of the entire device. A molding method and a tooth forming device can be provided.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to FIGS. In addition, the same member as a prior art example is demonstrated using the same code | symbol.
To form a clutch drum 10 as shown in FIG. 4, the tooth forming apparatus 1 according to the embodiment of the present invention has tooth profiles 2 and 2 extending in the axial direction on the outer peripheral wall 3 of the bottomed cylindrical coarse material 10a. As shown in FIGS. 1 and 2, a plurality of grooves 7, 7 extending in the axial direction are formed on the outer peripheral surface 6 in the circumferential direction, and the outer peripheral surface 6. A plurality of mandrels (supports) 5 that are mounted on the inner peripheral wall of the coarse material 10a and are movable in the axial direction, and a plurality of the outer peripheral walls 3 of the coarse material 10a are radially arranged around the mandrel 5. , 7 and rotatable rollers 8, 8.

  As shown in FIG. 1, the mandrel 5 is formed in a substantially cylindrical shape, and a plurality of grooves 7 and 7 extending in the axial direction are formed on the outer peripheral surface 6 in the circumferential direction. The mandrel 5 is attached to a reciprocating portion of a press mechanism (not shown) and is movable in the axial direction of the mandrel 5 (vertical direction in FIG. 1). And the bottomed cylindrical coarse material 10a is attached so that the outer peripheral surface 6 may be covered from the bottom face of the mandrel 5, and each groove part 7 and 7 provided in the outer peripheral surface 6 of the mandrel 5, and the inner peripheral wall of the coarse material 10a Are arranged so as to face each other.

As shown in FIG. 1, the roller 8 is formed in a substantially circular shape, and a tooth profile protrusion 9 for forming the tooth profiles 2 and 2 on the outer peripheral wall 3 of the coarse material 10a is formed on the entire peripheral surface thereof. ing.
In addition, as shown in FIG. 2, a plurality of roller composites 8a and 8a ′ (in this embodiment) integrally connected with a plurality (four in this embodiment) of the rollers 8 concentrically spaced apart from each other are provided (in this embodiment). 10 in the form) are provided. These roller composite bodies 8a and 8a ′ are radially arranged around the mandrel 5 and are rotatably supported by the holder 15.
In FIGS. 1 and 2, the roller complex located on the left half side is denoted by reference numeral 8a, and the roller complex located on the right half side is denoted by reference numeral 8a ′.

The support structure in which the roller composite bodies 8a and 8a ′ are supported by the holder 15 will be described in detail below with reference to FIGS.
The holder 15 is formed of a substantially cylindrical block body, and a plurality of (10 in the present embodiment) recesses 19 and 19 ′ are formed on the inner wall surface of the holder 15 at a predetermined angle (in the present embodiment). It is formed radially with a pitch of about 36 °. Shafts 16 and 16 are spanned in the respective recesses 19 and 19 ′ provided in the holder 15. The roller composite bodies 8a and 8a ′ are rotatably supported on the shafts 16 and 16, respectively.
In FIG. 1 and FIG. 2, the reference numeral 19 denotes a concave portion on the left half side that supports the roller composite bodies 8a and 8a on the left half side, and each roller composite body 8a ′ and 8a ′ on the right half side. The concave portion on the right half side that supports is indicated by reference numeral 19 ′.
Further, in this support form, each roller 8, 8 of each roller composite 8 a, 8 a ′ has a form in which a part of the respective peripheral surface protrudes into the internal space 15 a of the holder 15, and the outer peripheral surface 6 of the mandrel 5 When the mounted coarse material 10a passes through the internal space 15a of the holder 15, the tooth-shaped projections 9 and 9 of the rollers 8 and 8 rotate freely while the rollers 8 and 8 on the outer peripheral wall 3 of the coarse material 10a and Opposing portions can be pushed into the grooves 7 and 7 of the mandrel 5.
Further, discs 17 and 18 are disposed on both end surfaces of the holder 15 in the axial direction. Each of the discs 17 and 18 is formed with openings 17a and 18a into which the mandrel 5 can be inserted together with the coarse material 10a at substantially the center.

As can be seen from FIG. 1, for example, in FIG. 2, the roller composites (this embodiment) in the respective recesses (in this embodiment, five recesses) 19 ′ and 19 ′ located on the right half side of the holder 15. 8a 'and 8a' are each roller composites (in this embodiment, 5 recesses) 19 and 19 located on the left half side of the holder 15 (in this embodiment) 5) 8a and 8a are offset by an offset amount B on the mandrel 5 side (upper side in FIG. 1) in the moving direction of the coarse material 10a. This offset amount B is set to be substantially the same as the axial forming range H (see FIG. 4A) of each tooth profile 2, 2 provided on the outer peripheral wall 3 of the coarse material 10a.
In the embodiment of the present invention, the roller composite bodies 8a and 8a ′ disposed in the recesses 19 and 19 ′ of the holder 15 are arranged in the holder 15 so that the roller composite bodies 8a and 8a ′ have the same number. 2, for example, in FIG. 2, the roller composite bodies 8 a ′ and 8 a ′ in the concave portions 19 ′ and 19 ′ located on the right half side of the holder 15, and the left half side The roller composites 8a and 8a in the respective recesses 19 and 19 are positioned in the respective recesses 19 and 19 so that the roller composites 8a and 8a ′ of both groups are offset from each other in the moving direction of the coarse material 10a. However, for example, the adjacent roller composite bodies 8a and 8a ′ may be alternately or sequentially offset in the moving direction of the coarse material 10a.

Next, a tooth forming method using the tooth forming device 1 according to the embodiment of the present invention will be described.
First, the outer peripheral wall 3 of the coarse material 10a is attached to the outer peripheral surface 6 of the mandrel 5 attached to the press machine, and the groove portions 7 and 7 provided on the outer peripheral surface of the mandrel 5 and the inner peripheral wall of the coarse material 10a are provided. Arrange to face each other.
Then, the mandrel 5 is moved to the holder 15 side, and the coarse material 10 a is passed through the internal space 15 a of the holder 15 from the opening 17 a of the disk 17.
Then, first, the range corresponding to the right half circumference of the outer peripheral wall 3 of the coarse material 10a is the range of the roller composite bodies 8a ′ and 8a ′ in the recesses 19 ′ and 19 ′ located on the right half side of the holder 15 in FIG. The respective tooth profile projections 9 and 9 of the respective rollers 8 and 8 are brought into contact with the respective tooth profile projections 9 and 9 of the respective rollers 8 and 8 while the respective roller composite bodies 8a ′ and 8a ′ freely rotate in the direction of the arrow C. However, the part which opposes each roller 8 and 8 in the range for the right half circumference of the outer peripheral wall 3 of the rough material 10a is pushed into each groove part 7 and 7 of the mandrel 5. FIG. As a result, a plurality of tooth profiles 2 and 2 are formed in a range corresponding to the right half circumference of the outer peripheral wall 3 of the coarse material 10a.
Subsequently, the range of the left half circumference of the outer peripheral wall 3 of the coarse material 10a is set in the respective rollers 8, 8 of the roller composite bodies 8a, 8a in the concave portions 19, 19 located on the left half side of the holder 15 in FIG. The roller composite bodies 8a, 8a freely rotate in the direction of arrow D while contacting the tooth profile protrusions 9, 9, and the tooth profile protrusions 9, 9 of the rollers 8, 8 A portion facing the rollers 8, 8 in the range of the left half circumference of the wall 3 is pushed into the grooves 7, 7 of the mandrel 5. As a result, a plurality of tooth profiles 2 and 2 are formed in a range corresponding to the left half circumference of the outer peripheral wall 3 of the coarse material 10a.
Thus, in the present tooth forming apparatus 1, when a plurality of tooth shapes 2, 2 extending in the axial direction are formed on the outer peripheral wall 3 of the coarse material 10a in the circumferential direction, the outer peripheral wall 3 of the coarse material 10a is provided for every half of its circumference. In addition, a plurality of tooth profiles 2 and 2 are sequentially formed.

Next, as described above, when a plurality of tooth forms 2 and 2 are formed on the outer peripheral wall 3 of the coarse material 10a, a load change acting on the tooth forming apparatus (with offset) 1 according to the embodiment of the present invention is described. The result of comparing the load change acting on the conventional tooth forming apparatus (no offset) 50 shown in FIG. 5 will be described with reference to FIG.
According to FIG. 3, in the tooth forming apparatus 1 according to the embodiment of the present invention, the rising of the forming load is more gradual than the conventional tooth forming apparatus 50, and the maximum forming load is reduced by about 1/3. I understand that
That is, in the tooth forming apparatus 1 according to the embodiment of the present invention, the tooth profiles 2 and 2 are sequentially formed on the outer peripheral wall 3 of the coarse material 10a for each half of the circumference, so that each roller complex 8a, The reaction force that 8a 'receives from the coarse material 10a is such that only the roller composite bodies 8a' and 8a 'positioned on the right half side of the holder 15 in FIG. 2 receive the reaction force from the coarse material 10a, 2, each roller composite body 8 a, 8 a located on the left half side of the holder 15 receives a reaction force from the coarse material 10 a, and acts on each roller composite body 8 a, 8 a ′, that is, the entire tooth forming apparatus 1. The load becomes distributed. On the other hand, in the conventional tooth forming device 50, since each tooth profile 2, 2 is simultaneously formed in the entire range of the outer peripheral wall 3 of the coarse material 10a, all the rollers 8, 8 are simultaneously subjected to reaction force from the coarse material 10a. It is like that. As a result, the tooth forming apparatus 1 according to the embodiment of the present invention has a molding load that rises more gently than the conventional tooth forming apparatus 50, and the maximum molding load is greatly reduced. .
As shown in FIG. 3, in the tooth forming apparatus 1 according to the embodiment of the present invention, the roller composite bodies 8a and 8a ′ are arranged in a positional relationship that is offset from each other in the moving direction of the coarse material 10a. For this reason, the stroke of the mandrel 5 is required to be approximately twice as long as that of the conventional tooth forming device 50.

  As described above, in the embodiment of the present invention, a plurality of roller composites 8a and 8a ′ for forming a plurality of tooth shapes 2 and 2 extending in the axial direction on the outer peripheral wall 3 of the coarse material 10a in the circumferential direction are: They are arranged in a positional relationship offset by an offset amount B in the moving direction of the coarse material 10a. Thus, when a plurality of tooth shapes 2 and 2 extending in the axial direction are formed on the outer peripheral wall 3 of the coarse material 10a in the circumferential direction, the roller composite bodies 8a arranged offset to each other on the outer peripheral wall 3 of the coarse material 10a. , 8a ′, the respective tooth forms 2 and 2 are sequentially formed every half of the circumference, so that the maximum forming load acting on the entire tooth forming apparatus 1 is reduced and the miniaturization of the tooth forming apparatus 1 can be achieved.

  In addition, in the embodiment of the present invention, since each tooth profile 2 and 2 is sequentially formed, the non-tooth forming portion (or the tooth forming complete portion) regulates the axial extension of the outer peripheral wall 3 of the coarse material 10a. As a result, the expansion of the coarse material 10a in the axial direction of the outer peripheral wall 3 is suppressed, and the overhang of the material on the tops of the tooth profiles 2 and 2 is improved as compared with the prior art.

  In the tooth forming apparatus 1 according to the embodiment of the present invention, a plurality of roller composite bodies 8a and 8a ′ are provided in which a plurality of rollers 8 and 8 are integrally connected at intervals on a concentric circle. Although the composite bodies 8a and 8a ′ are functioned as one group and the roller composite bodies 8a and 8a ′ are offset from each other in the moving direction of the coarse material 10a, as another embodiment, they are arranged radially. In each roller 8, 8, the adjacent rollers 8, 8 may be arranged so as to be offset from each other in the moving direction of the coarse material 10a. In this embodiment, the rollers 8, 8 are alternately offset. The arrangement may be arranged, or the arrangement may be sequentially offset.

FIG. 1 is a diagram showing an internal structure of a tooth forming apparatus according to an embodiment of the present invention. FIG. 2 is an AA arrow view of FIG. FIG. 3 is a diagram comparing load changes acting on the tooth forming apparatus according to the embodiment of the present invention and the conventional tooth forming apparatus. 4A and 4B show the clutch drum, in which FIG. 4A is a side view and FIG. 4B is a bottom view. FIG. 5 is a view showing an internal structure of a conventional tooth forming apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tooth shape apparatus, 2 Tooth profile, 3 Outer wall, 5 Mandrel (support body), 6 Outer surface, 7 Groove part, 8 Roller, 8a, 8a 'Roller complex, 9 Tooth profile protrusion, 10 Clutch drum, 10a Rough material

Claims (7)

A plurality of rollers are formed radially on the outer peripheral wall of the coarse material to form a tooth profile per roller, and the support on which the coarse material is mounted is moved in the axial direction so that the shaft is attached to the outer peripheral wall of the coarse material. In a tooth forming method for forming a plurality of tooth forms extending in the circumferential direction in the circumferential direction,
The rollers are arranged offset from each other in the movement direction of the coarse material, and a plurality of tooth shapes extending in the axial direction are sequentially formed on the outer peripheral wall of the coarse material by the rollers offset from each other. Tooth formation method.   The tooth forming method according to claim 1, wherein the rollers are alternately offset.   The tooth forming method according to claim 1, wherein the rollers are sequentially offset.   2. The tooth forming method according to claim 1, wherein the radially arranged rollers are divided into a plurality of rollers, and the divided rollers are arranged offset from each other in the moving direction of the coarse material. . In a tooth forming device for forming a plurality of tooth shapes extending in the axial direction on the outer peripheral wall of the coarse material,
The tooth forming apparatus has a plurality of axially extending grooves formed on an outer peripheral surface thereof, a support body having an inner peripheral wall of the coarse material mounted on the outer peripheral surface and movable in the axial direction, and the support And a plurality of rotatable rollers arranged radially around the body and pushing the outer peripheral wall of the coarse material into the grooves of the support, and the rollers are offset from each other in the moving direction of the coarse material. A tooth forming device characterized in that it is arranged.   Each of the rollers is configured by providing a plurality of roller composites in which a plurality of rollers are concentrically arranged at intervals, and the roller composites are arranged offset from each other in the moving direction of the coarse material. The tooth forming apparatus according to claim 5. 6. The tooth forming apparatus according to claim 5, wherein in each of the radially arranged rollers, adjacent rollers are arranged offset from each other in the moving direction of the coarse material.

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