JPH11207531A - Manufacture of cylindrical part having tooth-shaped flange and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To streamline a process and reduce costs. SOLUTION: A roughly shaped material 7 is set in a tooth-shaped die 51 by using a divided punch 10 composed of a cylindrical shaft machining punch 12 and a flange machining punch 11 ring-shaped in section and arranged around the shaft machining punch 12 so as to be slid and a stacked die 5 made by stacking a tooth-form die 51 and a shaft machining die 52, the entire divided punch 10 is advanced first to press the shaped material 7 to the tooth-shaped die 51 by the flange machining punch 11, and to advance the same to perform tooth-shaped machining for forming the crude flange part in a tooth shape, and then only the shaft machining punch 12 included in the divided punch 10 is advanced more deeply to perform inner and outer diameter machining for forming the inner and outer diameters of a crude shaft part to have desired dimensions together with the shaft machining die 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an emergency part of a cylindrical part having a toothed flange comprising a cylindrical shaft part and a large-diameter flange part, and having a toothed shape such as a spline on the outer peripheral part of the flange part. And a device that can be reasonably manufactured.

[0002]

2. Description of the Related Art For example, in the case of parts for automobiles, a cylindrical part having a cylindrical shaft part having a hollow part and a large-diameter flange part, and having a tooth shape such as a spline provided on the outer peripheral part of the flange part. Are widely used. As a specific shape, for example, as shown in FIG. 11 to be described later, a cylindrical shape having a toothed flange portion 82 provided with a tooth shape of a square spline 83 on an outer peripheral portion and a cylindrical shaft portion 81 having a hollow portion 80. There is a part 8. Further, as shown in FIG. 12, the shaft portion 81 of the tubular part 8 may be provided with minute splines 84 and 85 also on the inner and outer peripheral surfaces.

In the case of manufacturing the cylindrical part 8 having the toothed flange, press-forming may be performed, but if the required strength of the cylindrical part 8 is high, the cylindrical part 8 is partially thickened. It is difficult to apply this sheet metal forming because of the necessity. Therefore, high strength cylindrical parts 8
In manufacturing the shaft member 81, the shaft portion 81 and the toothed flange 83 are formed by cutting a crude material prepared by casting or hot forging.

[0004] However, the manufacturing method centering on the cutting process causes an increase in the number of steps and a decrease in material yield, resulting in an increase in cost. Therefore, in recent years, with the progress of precision forging technology, a manufacturing method combining hot forging, cold forging, and the like in addition to the above-described cutting has come to be used.

More specifically, as shown in FIG. 9, first, a pipe-shaped material is hot-forged to form a rough material 7. This can be replaced by casting. Further, the rough shaped material 7 to be manufactured has a hollow portion 70, a cylindrical rough shaft portion 71 thicker than the shaft portion 81 of the product to be obtained, and a coarse tooth shape 73 serving as a basis of the tooth shape. And a rough flange 72.

Next, as shown in FIG. 10, the outer peripheral surface and the inner peripheral surface of the shaft portion 71 of the rough material 7 are cut to finish the shaft portion 81 of a desired size. Next, as shown in FIG. 11, the rough flange portion 72 of the coarse material 7 is subjected to cold forging to provide square splines 83. As a result, the cylindrical component 8 having the toothed flange portion 83 is obtained.

Further, as described above, the shaft 81 of the cylindrical member 8 is formed.
When the minute splines 84 and 85 are provided on the inner and outer peripheral surfaces of the shaft 81, the shaft 81 is again cold forged.
As a result, as shown in FIG. 12, it is possible to obtain the cylindrical component 8 having the toothed flange portion 83 and the minute splines 84 and 85 provided on the inner and outer peripheral surfaces of the shaft portion 81.

[0008]

However, the conventional method of manufacturing the cylindrical part 8 having the toothed flange has the following problems. That is, in the conventional manufacturing method, as described above, after the preliminary step of manufacturing the rough shaped material 7, the inner and outer diameter processing for finishing the inner and outer diameter dimensions of the shaft portion 81 and the square spline ( It is necessary to perform a tooth forming process for forming the tooth shape) 83.

This is because it is necessary to improve the rough shape material 7 because the roughing material 7 has a draft due to the hot forging, a dimensional change due to thermal deformation, a rough surface of the material surface, and the like. This is because cutting or cold working is required to obtain a high product.

Therefore, as described above, the inner and outer diameter machining step and the tooth profile machining step are indispensable steps in manufacturing the cylindrical part 8. However, when these two steps are performed as separate steps as described above, it is difficult to say that rationalization of the manufacturing steps and cost reduction are sufficient. On the other hand, with the conventional manufacturing method and manufacturing apparatus, it is difficult to further rationalize the process, and development of a more excellent manufacturing technique has been desired.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and a method and apparatus for manufacturing a cylindrical component having a toothed flange, which can further streamline the process and reduce the cost compared to the conventional method. It is intended to provide.

[0012]

According to a first aspect of the present invention, there is provided a cylindrical shaft having a hollow portion and a large-diameter flange provided at one end of the shaft. A method for manufacturing a cylindrical part having a toothed flange having a shape, comprising: a cylindrical coarse shaft part having a smaller diameter and a thicker wall than the shaft part; and a coarse flange having a coarse tooth shape as a basis of the tooth shape. And a columnar shaping punch having an outer diameter corresponding to the inner diameter of the shaft, and a cross-sectional ring slidably disposed around the shank punch. Split punch consisting of a flanged punch
The tooth profile die is provided with a tooth profile die having a die hole gradually changing from the coarse tooth profile to the tooth profile along the thickness direction, and a shaft processing die having a die hole corresponding to the outer diameter of the shaft portion. Using a laminated die that is positioned on the side of the split punch and stacked, the coarse material is inserted into the toothed die from the coarse shaft and set, and first, the entire split punch is advanced to perform the flange processing. The coarse material is pressed against the toothed die by a punch, and the coarse material is advanced to form the rough flange portion into the tooth shape. Then, only the shaft working punch in the split punch is used. A cylindrical part having a toothed flange, wherein the cylindrical part is further advanced to perform inner and outer diameter processing for forming the inner and outer diameters of the coarse shaft portion to desired dimensions together with the shaft processing die. In the manufacturing method.

The most remarkable point in the present invention is that, by using the split punch and the lamination die having the above structure, the two cold workings of the tooth profile processing and the inner and outer diameter processing can be performed at once by one stroke of the split punch. Is to do. The tooth profile processing corresponds to cold forging processing, and the inner and outer diameter processing corresponds to ironing processing.

As described above, a material having the rough shaft portion and the rough flange portion is prepared as the rough material.
This rough material can be obtained, for example, by casting or hot forging a rod-shaped material. Further, the coarse shaft portion is provided with a smaller diameter and a larger thickness than the shaft portion to be obtained. Thereby, it is possible to sufficiently iron the rough shaft portion during the inner and outer diameter processing. Further, the coarse tooth profile is provided on the coarse flange portion. This coarse tooth profile can be provided, for example, by forming a projection in advance on a convex portion of the tooth profile to be obtained.

Next, the formation of the above-mentioned rough material is performed using the above-mentioned split punches and lamination dies as described above. Then, the crude material is set in a lamination die, and the above-mentioned split punch is made to make one stroke. At this time, the coarse material is first processed by a flange working punch in the split punch and a toothed die in the laminated die.

That is, the coarse material is pressed and advanced by the toothed die by the flange working punch. On the other hand, the toothed die has a die hole that gradually changes from a coarse tooth shape to a desired tooth shape as described above. For this reason, the rough flange portion of the above-mentioned rough shaped material forms a tooth shape as it advances.

Next, after the formation of the tooth profile is completed, only the shaft machining punch of the divided punches is advanced. Thereby, the shaft working punch enters the region of the shaft working die in the laminated die. Then, as the shaft processing punch advances, the coarse shaft portion is expanded and pressed into a die hole of the shaft processing die to form the inner and outer diameters of the coarse shaft portion to desired dimensions. As a result, the crude material is formed into a cylindrical part having a desired shape to be obtained.

Next, the operation and effect of the present invention will be described.
In the manufacturing method of the present invention, the above-mentioned rough shaped material is formed using the above-mentioned split punch and the above-mentioned laminated die. Thus, as described above, the cold forging of the flange portion and the ironing process of the shaft portion can be performed at once by only one stroke of the split punch.

For this reason, the above-described tooth profile machining and inner / outer diameter machining, which conventionally required two separate processes, can be combined into one process. Moreover, this integrated one step can be a highly efficient press working using the above-mentioned die and punch. Therefore, according to the present invention, it is possible to provide a method for manufacturing a cylindrical part having a toothed flange, which can further streamline the process and reduce the cost compared to the related art.

A second aspect of the present invention comprises a cylindrical shaft portion having a hollow portion and a large-diameter flange portion provided at one end of the shaft portion, and an outer peripheral portion of the flange portion has a tooth shape. A cylindrical part having a toothed flange having a shape is provided with a rough part having a cylindrical coarse shaft part having a smaller diameter and a thicker wall than the shaft part and a coarse flange part having a coarse tooth form as a basis of the tooth shape. An apparatus for manufacturing a shaped material by cold working, comprising: a cylindrical shaft processing punch having an outer diameter corresponding to the inner diameter of the shaft portion; and a slidably disposed periphery of the shaft processing punch. Divided punch consisting of a flanged punch having a ring-shaped cross section, a toothed die provided with a die hole that gradually changes from the coarse tooth shape to the desired tooth shape along the thickness direction, and the outer diameter of the shaft portion And a shaft processing die having a die hole equivalent to A stacking die formed by laminating a plurality of shaped dies on the side of the split punch, and a pressing device for pressing and advancing the split punch, wherein the pressing device includes the flanged punch and the tooth profile. Advance the whole of the split punch until the tooth profile machining by the die is completed.
After the completion of the tooth profile machining, only the shaft machining punch is advanced so as to advance the cylindrical component manufacturing apparatus having a toothed flange.

The most remarkable point of the manufacturing apparatus of the present invention is that it has a split punch and a lamination die having the above-described structure, and the advance of the split punch is performed before or after the completion of the tooth profile processing. It is to have the above-mentioned pressurizing device which can be switched to any one alone.

The pressurizing device can have various structures. For example, as described later, there are a method using a contraction member, a method of separately providing a pressing mechanism of a pressing device for the flange processing punch and a method of the shaft processing punch, and adjusting the operation timing.

By using the manufacturing apparatus of the present invention, the above-mentioned excellent manufacturing method can be easily and reliably realized, and the manufacturing of a cylindrical part having a toothed flange can be greatly rationalized.

Next, as in the third aspect of the present invention, it is preferable that the flange working punch is fixed to the pressing device via a contracting member that contracts at a pressure equal to or higher than a predetermined pressure. Here, the predetermined pressure refers to, for example, a pressure equal to or higher than a processing pressure necessary for the above-described tooth profile processing. This makes it possible to easily and reliably control the stop of the advancement of the flange machining punch and the advancement of only the shaft machining punch by utilizing the machining pressure that increases with the completion of the tooth profile machining. Further, therefore, asynchronous driving of the punches can be realized by one drive system, and there is no need to provide two drive systems, so that equipment costs can be reduced.

Further, as in the fourth aspect of the present invention, it is preferable that the contraction member is a gas cylinder. In this case, the predetermined processing pressure can be easily adjusted by the gas filling pressure of the gas cylinder, and the structure of the pressurizing device can be simplified.

Further, as in the invention of claim 5, it is preferable that a tip of the shaft machining punch is provided with a chamfered portion inclined at 15 to 20 degrees with respect to the axis direction. If the angle of inclination of the chamfer exceeds the angle in the above specified range,
There is a possibility that the spread processing of the coarse shaft portion by the shaft processing punch cannot be performed smoothly.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment A method and an apparatus for manufacturing a cylindrical part having a toothed flange according to an embodiment of the present invention will be described with reference to FIGS. First, in this example, as shown in FIG. 7, a cylindrical shaft portion 81 having a hollow portion 80 and a large-diameter flange portion 82 provided at one end of the shaft portion 81 are provided. A cylindrical component 8 having a toothed flange provided with a tooth profile 83 made of a square spline on the outer peripheral portion is produced. In this example, as shown in FIG. 8, the cylindrical part 8 is provided with minute splines on the inner and outer surfaces of the shaft portion 81 in another cold forging step.

As a material, as shown in FIG.
Coarse material 7 having a hollow portion 70 and a cylindrical coarse shaft portion 71 having a smaller diameter and a thicker wall than the shaft portion 81 and a coarse flange portion 72 provided with a coarse tooth shape 73 serving as a basis of the tooth shape 83. Is used. Then, the cylindrical member 8 is cold-worked by the manufacturing apparatus 1 described below.
(FIG. 7).

As shown in FIG. 1, the manufacturing apparatus 1 used in this embodiment includes a cylindrical shaft-forming punch 12 having an outer diameter corresponding to the inner diameter of the shaft portion 81 and the shaft-forming punch 12.
And a split punch 10 composed of a flanged punch 11 having a ring-shaped cross section which is slidably disposed around the periphery.

As shown in the figure, the coarse tooth profile 7 is gradually provided below the split punch 10 along the thickness direction.
Die hole 51 changing from 3 to desired tooth profile 83
0, and a shaft processing die 52 having a die hole 520 corresponding to the outer diameter of the shaft portion 81.
And a laminated die 5 formed by laminating the toothed dies 51 on the divided punch 10 side.

As shown in the figure, a pressurizing device 3 for pressurizing and advancing the split punch 10 is connected to the split punch 10. The pressing device 3 advances the whole of the split punch 10 until the tooth forming by the flange forming punch 11 and the tooth shape die 51 is completed. After the tooth forming is completed, only the shaft processing punch 11 is moved. It is configured to move forward.

Hereinafter, this will be described in detail. Split punch 1
Reference numeral 0 is provided on the punch holder 30 of the pressurizing device 3 as shown in FIG. The pressurizing device 3 has the punch holder 30 fixed to a press (not shown), and is configured to lower the punch holder 30.

As described above, the split punch 10 is formed by slidably combining the cylindrical shaft punch 12 and the ring-shaped flange punch 11. The shaft machining punch 12 is provided with a diameter corresponding to the inner diameter of the shaft portion 81 of the cylindrical part 8 for which the outer diameter is to be obtained, and has a chamfered portion 125 inclined at 15 to 20 degrees at the tip end. It is. Further, as shown in FIGS. 1 and 4, the flange processing punch 11 has a distal end outer peripheral surface 112 provided in a desired tooth shape.

As shown in FIG. 1, the split punch 10 has a base portion 129 of the shaft working punch 12 fixed to the punch holder 30 and disposed on the punch holder 30. Also,
The punch holder 30 has a cylindrical hollow portion 32 at the center.
The hollow portion 32 has a disc-shaped plate 4
2 is arranged to be able to move up and down. And, as shown in FIG.
9 to the plate 42.

As shown in FIG. 1, four connecting shafts 119 extend from the bottom 119 of the flange working punch 11 and pass through the through holes 128 formed in the base 129 of the shaft working punch 12. Is connected to the plate 42 at The punch holder 30
As shown in FIG. 1 and FIG. 3, four gas cylinders 4 as contracting members are provided on the upper part.

As shown in FIG. 1, the gas cylinder 4 has its rod 41 connected to the plate 42, and is configured to contract as the plate 42 rises.
The contraction of the rod 41 in the gas cylinder 4 is configured to be performed when a predetermined pressure described later is applied.

Next, as shown in FIG. 1, the laminated die 5 is formed by sequentially laminating a toothed die 51 and a shaft processing die 52 from above. The stacked dies 5 are disposed in the die insertion holes 60 of the die holder 6 via donut-shaped spacers 61.

A fixing ring 62 is engaged with the outer periphery of the toothed die 51 and is fixed to the die holder 6. Thus, the stacked dies 5 are firmly set on the die holder 6. Further, a knockout pin 63 for taking out the molded product is provided in the inner hole of the spacer 61 in the die holder 6. The knockout pin 63 is provided with a vertically extending shaft 6 extending downward.
4 to move up and down.

Next, in forming the coarse material 7 using the manufacturing apparatus 1, first, as shown in FIG. 1, the coarse material 7 is inserted into the toothed die 51 from the coarse shaft 71 and set. Next, as shown in FIG.
Of the divided punch 10 is advanced by pushing down the punch holder 30, and the rough material 7 is pressed against the toothed die 51 by the flange forming punch 11, and the rough material 7 is advanced to make the rough flange portion 71 have the tooth shape 83. To form a tooth profile.

That is, as shown in FIG. 2A, the abutting surface 111 (FIG. 1) of the front end of the flange working punch 11 is firstly moved by the advance of the whole of the split punch 10 so that the rough flange 72 (FIG. 6) It comes into contact with the upper surface and is pressed downward. As a result, the coarse material 7 descends while being formed in the rough flange portion 71 by the die hole 510 of the tooth shape die 51. Then, when the rough flange portion 72 of the rough shaped material 7 descends to the lower end of the toothed die 51, the rough flange portion 72 is formed into a flange portion 82 having a desired tooth shape 83, and the tooth shape processing is completed.

Next, at the same time as the completion of the above-mentioned tooth profile machining, as shown in FIG. 2B, the advance of the flange machining punch 11 is stopped, and thereafter, only the shaft machining punch 12 advances. That is, the flange processing punch 11 is brought into a state in which the front end face 111 is in direct contact with the upper end part 521 (FIG. 1) of the inner face of the shaft processing die 52 via the flange part 82 by the completion of the tooth profile processing. Therefore, even if the punch holder 30 is lowered, the advance of the flange processing punch 11 is hindered.

Here, the gas cylinder 4 is provided in the punch holder 30. The gas cylinder 4 is set to contract when a pressure higher than a predetermined pressure is generated. The predetermined pressure in this example is set to a processing pressure necessary for the tooth profile processing. For this reason, during the above-mentioned tooth profile machining, the flange machining punch 11 advances with the punch holder 30, but the pressure applied to the flange machining punch 11 by the completion of the tooth profile machining rapidly increases,
Exceeds the predetermined pressure. As a result, the gas cylinder 4 contracts with the advance of the punch holder 30 and the flange processing punch 11 remains stopped, and only the shaft processing punch 12 advances.

Next, as shown in FIG. 2 (b), the shaft forming punch 12 alone is further advanced to form the inner and outer diameters of the coarse shaft portion 71 together with the shaft forming die 52 into desired dimensions. Do. That is, the coarse shaft portion 71 of the coarse material 7 is provided in a shape having a smaller diameter and a larger thickness than the desired shaft portion 81. Therefore, by the advance of the shaft processing punch 12, the rough shaft portion 71 is pushed and spread, and the outer peripheral surface thereof is pressed by the shaft processing die 52 to perform ironing.

Further, since the chamfered portion 125 is provided at the tip of the shaft processing punch 12, the ironing is performed smoothly. Then, as shown in FIG.
At the time when the shaft processing punch 12 penetrates the shaft portion 81 and projects downward, the ironing process is completed, and the inner and outer diameter processing of the shaft portion 81 is completed. Thereby, the cylindrical part 8 shown in FIG. 7 is obtained.

Thereafter, the split punch 10 is raised by raising the pressurizing device 3 to release the engagement state between the split punch 10 and the lamination die 5. Next, the cylindrical part 8 remaining in the lamination die 5 is taken out by raising the knockout pin 63.

Next, in this example, as shown in FIG. 8, minute splines 84 and 85 are provided on the inner and outer peripheral surfaces of the shaft portion 81 of the cylindrical part 8 by a separately provided forging machine, and the cylindrical part as a product is formed. 8 is completed.

Next, the operation and effect of this embodiment will be described. In this embodiment, the rough material 7 is formed using the split punch 10 and the laminated die 5. As a result, as described above, the cold forging of the flange portion 82 and the ironing process of the shaft portion 81 can be performed at once by only one stroke of the split punch 10.

For this reason, the above-described tooth profile machining and inner / outer diameter machining, which conventionally required two separate processes, can be combined into one process. In addition, this integrated process uses the split punch 10 and the lamination die 5,
High-efficiency pressing can be performed. Therefore, according to this example, the process can be streamlined much more than before, and the cost of the cylindrical component having the toothed flange obtained can be reduced.

In the manufacturing apparatus of this embodiment, the non-synchronous driving of the flange working punch 11 and the shaft working punch 12 in the split punch 10 is realized by one driving device by using the contracting member composed of the gas cylinder 4. be able to. As a result, it is not necessary to use an expensive double-acting press having two drive systems, and it is possible to reduce the equipment cost.

[0050]

As described above, according to the present invention, it is possible to provide a method of manufacturing a cylindrical part having a toothed flange and an apparatus therefor, which can further streamline the process and reduce the cost as compared with the prior art. it can.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a structure of a manufacturing apparatus for a tubular part according to an embodiment.

FIG. 2 shows (a) tooth profile processing and (b) in the embodiment.
Explanatory drawing which shows the state in which inner and outer diameter machining was completed, respectively.

FIG. 3 is a sectional view taken along line AA in FIG. 1;

FIG. 4 is a sectional view taken along line BB in FIG. 1;

FIG. 5 is a sectional view taken along line CC in FIG. 1;

FIG. 6 shows (a) DD of the crude material in the embodiment.
FIG. 3 is a cross-sectional view taken along a line arrow, and FIG.

FIG. 7 is a diagram illustrating (a) D- of the tubular part in the embodiment.
FIG. 3 is a cross-sectional view taken along line D of FIG.

FIG. 8A is a cross-sectional view taken along the line DD of a cylindrical component having a spline provided on a shaft portion, and FIG.

FIG. 9 is a cross-sectional view taken along line DD in FIG. 9A, and FIG.

10 (a) is a cross-sectional view taken along a line DD of a rough material having a shaft portion subjected to cutting processing in a conventional example, and FIG. 10 (b) is a bottom view.

FIG. 11 (a) DD of a cylindrical part in a conventional example.
FIG. 3 is a cross-sectional view taken along a line arrow, and FIG.

FIG. 12A is a cross-sectional view taken along line DD of a cylindrical component having a spline provided on a shaft in a conventional example, and FIG.

[Explanation of symbols]

1. . . Manufacturing equipment for cylindrical parts with toothed flanges,
10. . . Split punch, 11. . . 11. Flanging punch, . . Shaft machining punch, 3. . . Pressurizing device, 3
0. . . 3. Punch holder, . . Gas cylinder,
5. . . Stacked dies, 51. . . Tooth dies, 5
2. . . Shaft machining dies, 6. . . Dice holder, 6
3. . . Knockout pin, 7. . . Coarse material, 7
0. . . Hollow part, 71. . . Coarse shaft portion, 72. . . Coarse flange portion, 73. . . Coarse tooth profile, 8. . . Tubular member, 8
0. . . Hollow part, 81. . . Shaft, 82. . . Flange part, 83. . . Tooth profile (square spline),

Claims (5)

[Claims] 1. A toothed shape comprising a cylindrical shaft portion having a hollow portion and a large-diameter flange portion provided at one end of the shaft portion, and an outer peripheral portion of the flange portion having a tooth shape. In a method of manufacturing a cylindrical part having a flange, a coarse material having a cylindrical coarse shaft part having a smaller diameter and a thicker wall than the shaft part and a coarse flange part provided with a coarse tooth profile serving as a basis for the tooth shape is provided. And a cylindrical punch having an outer diameter corresponding to the inner diameter of the shaft, and a flange punch having a ring-shaped cross section slidably disposed around the punch. A split punch, a toothed die having a die hole gradually changing from the coarse tooth shape to the tooth shape along the thickness direction, and a shaft processing die having a die hole corresponding to the outer diameter of the shaft portion are formed by the above-described method. Position the toothed dies on the split punch side The coarse material is inserted into the toothed die from the coarse shaft portion and set by using a laminated die formed by stacking and stacking. The material is pressed against the tooth-shaped die and the coarse material is advanced to perform tooth-forming processing for forming the coarse flange portion into the tooth-shaped shape. Then, only the shaft processing punch in the split punch is further advanced further. A method of manufacturing a cylindrical part having a toothed flange, wherein inner and outer diameter processing for forming the inner and outer diameters of the coarse shaft portion to desired dimensions together with the shaft processing die is performed. 2. A toothed flange comprising a cylindrical shaft portion having a hollow portion and a large-diameter flange portion provided at one end of the shaft portion, and having a tooth profile on an outer peripheral portion of the flange portion. Cold working of a cylindrical part having a cylindrical part having a cylindrical coarse shaft part having a smaller diameter than the shaft part and a coarse flange part provided with a coarse tooth form serving as a basis for the tooth profile. A cylindrical shaft processing punch having an outer diameter corresponding to the inner diameter of the shaft portion, and a ring-shaped flange processing punch slidably disposed around the shaft processing punch. , A toothed die having a die hole gradually changing from the coarse tooth shape to the tooth shape along the thickness direction, and a shaft processing die having a die hole corresponding to the outer diameter of the shaft portion And the above tooth profile die on the above split punch side It consists of a stacking die which is positioned and stacked, and a pressing device for pressing and advancing the split punch, and the pressing device is used until the tooth forming by the flange punch and the tooth die is completed. An apparatus for manufacturing a cylindrical part having a toothed flange, wherein the entirety of the split punch is advanced, and after the tooth forming is completed, only the shaft processing punch is advanced. 3. A cylindrical shape having a toothed flange according to claim 2, wherein said flange working punch is fixed to said pressurizing device via a shrinking member which shrinks at a pressure higher than a predetermined pressure. Parts manufacturing equipment. 4. An apparatus according to claim 3, wherein said shrinking member is a gas cylinder. 5. The method according to claim 2, wherein
At the tip of the shaft machining punch, 15 to 15
An apparatus for manufacturing a cylindrical part having a toothed flange, which is provided with a chamfered portion inclined at 20 degrees.