JPH06565A - Manufacture of toothed cylindrical parts - Google Patents

Abstract

PURPOSE:To obtain a manufacturing method at the time of manufacturing a toothed cylindrical parts such as clutch drum for speed gear changer in e.g. an automatic car. CONSTITUTION:A belt-like intermediate part 2 having a prescribed width in parallel with a longitudinal side (a) in a rectangular blank material 1 is provided and plural tooth formed parts 3, 4 are disposed to both sides holding the belt- like intermediate part 2 therebetween. Then a progressive pressing work is executed by a progressive pressing die 10 having plural teeth parts 13a, 15b. After forming the tooth part (t) in the tooth forming parts 3, 4, both lateral sides (b), (b) in the formed blank 1a are welded to form the cylindrical blank, and by cutting the intermediate part 2, plural ring gear blanks 1a, 1a are manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method for manufacturing a toothed cylindrical part such as a clutch drum for a transmission of an automatic vehicle.

[0002]

2. Description of the Related Art Conventionally, for example, as a method of manufacturing a clutch drum of an automatic vehicle or a component having a gear portion on a cylindrical outer peripheral portion such as a belt pulley,
A press molding method such as molding of a clutch drum as shown in Japanese Patent Publication No. 49-5773 or molding of a drum direct clutch as shown in JP-A No. 3-189044 is known. Further, for example, a press molding method as shown in FIG. 7 is known, and a molding die A as shown in (a) is used.
A blank material W in the form of a round plate is draw-formed to form a rough forming material W1, and then a forming material W2 having a general shape is formed by draw forming with a forming die B as shown in (b). To mold. Then, after that, a forming die C for restliking as shown in (c)
After the required dimensional accuracy is obtained by, the outer peripheral flange portion is raised to form the forming material W3, and further, by ironing with the ironing die D as shown in (D), or press work with the cam type die E, The product W4 having the tooth portion T on the outer peripheral portion is formed.

[0003]

However, in the conventional case, in the press molding method as described above, the number of molds and the number of parts are increased, and not only the precision of the constituent parts of each mold is required, but also For example, when the tooth portion T is finally formed by the molding die D, there is a problem that the tooth shape of the die becomes three-dimensional and precision is required for the ironing surface, and the die cost tends to be high. . Also, in the press work itself, it is necessary to pay attention to the setting control of the clearance amount in order to obtain the optimum ironing rate, and moreover, it is necessary to pay attention to the knockout measure because the molded product tends to be gazed on the mold after molding. Was hanging. Further, when the tooth portion T is formed by the forming die E, the outer shape of each tooth is not an edge and is easily blurred, and moreover, it cannot be precisely processed unless the plate thickness of the material is precisely controlled. There was a problem. Further, in the conventional method, there is a problem in that it takes time to manufacture the molding die, so that it is difficult to respond to design changes and the like.

[0004]

In order to solve such a problem, the present invention, when manufacturing a toothed cylindrical part having a tooth portion on the outer peripheral surface of the cylindrical part, defines a predetermined shape parallel to the vertical side on a rectangular blank material. A belt-shaped intermediate portion having a width is provided, a plurality of tooth portion forming portions are set on both sides of the belt-shaped intermediate portion, and each tooth portion is formed in the plurality of tooth portion forming portions by a progressive press. Then, after that, the lateral sides are joined together to form a cylindrical shape, and the intermediate portion is cut to form a plurality of toothed cylindrical parts.

[0005]

[Function] A tooth is formed in a plurality of tooth forming portions set on a rectangular blank material by a progressive press, and the forming strain generated at this time is absorbed by the intermediate portion sandwiched between the tooth forming portions and the accuracy is improved. Can be secured. Further, the tooth profile of the progressive feed press may be, for example, about 3 to 5 teeth, which is cheaper and simpler than the all-round tooth profile die. Further, the press work itself is simple. Finally, if the intermediate portion is cut, a plurality of pieces can be taken simultaneously.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for manufacturing a toothed cylindrical part according to the present invention will be described with reference to the accompanying drawings. 1 and 2
3A and 3B are process diagrams showing the steps of the manufacturing method of the present invention.
Shows a front view and a side view of the progressive press die.

An embodiment of the method for manufacturing a toothed cylindrical part of the present invention is proposed as a method for manufacturing a component of a clutch part for a vehicle transmission, and a ring gear part molded by the method of the present invention is applied. The clutch parts are manufactured by welding separately molded foil parts.

Then, the manufacturing process of the ring gear component of the present invention begins with the setting of the blank 1 as shown in FIG.

That is, the blank 1 is, for example, a rectangular steel plate in which the vertical side a is the long side and the horizontal side b is the short side. The blank 1 has a step portion d parallel to the vertical side a. Is provided on both sides, and the toothed portion forming portions 3 and 4 having predetermined width intervals m and n are formed on both sides thereof.

In this embodiment, the width intervals m and n of the tooth forming portions 3 and 4 are the same, and the width interval of the intermediate portion 2 is the same as the sum of m and n. They may be different as described later.

Next, the blank material 1 set in this way is put into the progressive feed press die 10 to form the teeth. The outline of the progressive feed press die 10 will be described with reference to FIGS. 3 and 4.

The lower die of the progressive press die 10 is a bolster 1.
1 and a die holder 12 provided on the die holder 1.
2 is provided with a die 13, and the upper die is provided with a punch holder 14 that can be opened and closed with respect to the lower die, and a punch 15 supported by the punch holder 14.

The punch holder 14 has a structure shown in FIG.
A plurality of guide posts 16 as shown in FIG. 3 are provided, and the lower end portion of the guide posts 16 are inserted into the guide bushes 17 provided on the die holder 12 to guide the vertical movement when the mold is opened and closed.

Further, as shown in FIG. 3, the molding surface of the die 13 is formed into a projecting arc shape in a front view, and is provided with a plurality of tooth-shaped portions 13a provided along the arc. On the other hand, the forming surface of the punch 15 is formed in a concave arc shape, and is provided with a tooth mold portion 15a corresponding to the tooth mold portion 13a of the die 13.

As shown in FIG. 4, the die 13 and the punch 15 are provided as a pair on the left and right, respectively, and correspond to the positions of the pair of tooth forming portions 3 and 4 set in the blank 1. I am letting you.

By the way, the bolster 11 is provided with an arcuate cut-out portion 11a as shown in FIG.

That is, the center of the arc of the cut-out portion 11a substantially coincides with the center O of the arc of the molding surface of the die 13 or the punch 15, and serves as an escape area for the progressive press-formed molding material 1a. Is.

For this reason, as shown in FIG. 4, the depth direction of the cut-out portion 11a is wider than the length of the lateral side b of the blank material 1, and the thickness direction of the forming material 1 as well.
The thickness width is sufficient to avoid interference with a.

The blank material 1 is added to the progressive press die 10 as shown in FIG.
When the blank material 1 is fed from the side of 0, the blank material 1 is fed along the direction of the vertical side a, and the tooth portion t is sequentially formed from the ends of the tooth portion forming portions 3 and 4 by the progressive feed press.

When the progressive press proceeds, as shown in FIG. 1C, the forming material 1a after the tooth portion t is formed.
Rounds into a circular shape and passes through the inside of the cut-out portion 11a from the tip side.

When the molding of all the tooth portions from the front end to the rear end is completed and the molding material 1a rolled into a substantially cylindrical shape as shown in FIG. T
Joined by welding such as IG welding. Then, in order to remove the distortion caused by the welding, the circularity correction forward press die 20 shown in FIG.

When the welding distortion is corrected, as shown in (f), the center of the intermediate portion 2 is cut and two ring gear blanks 1b are taken at the same time. Then, the intermediate portion of each ring gear material 1b is configured as the piston surface 2b.

The diameter of the piston surface 2b can be freely adjusted to the piston diameter by adjusting the length of the vertical side a of the blank material 1 or the depth of the step portion of the stepped intermediate portion 2. Can be done.

In order to obtain the accuracy of the piston surface 2b, the piston surface accuracy producing and ironing press die 2 shown in (g) is used.
The piston surface 2b is ironed by 1.

Next, as shown in (H), a separately molded wheel component 5 is welded to the ring gear blank 1b to form a clutch component, and then the gear part circularity ironing press die 22 shown in (L) is used to form a tooth. Ironing for finishing of part t is performed.

In the embodiment, one strip-shaped stepped intermediate portion 2 is provided in the center of the blank 1 so that two blanks can be taken simultaneously. However, a plurality of strip-shaped intermediate portions 2 can be provided so that a large number can be taken. You may

By the way, the plurality of ring gear blanks 1b molded at the same time may be different in shape and the like for each blank.

That is, the molding material 1a of FIG. 5 has a different diameter, and the molding material 1a of FIG. 6 has a different length of the tooth portion t. This combination is arbitrary, but when changing the length of the tooth portion t, the width intervals m and n of the tooth portion forming portions 3 and 4 of the blank material 1 of FIG. The width interval of is also changed according to the width intervals m and n of the tooth forming portions 3 and 4. That is, when the width interval m (or n) of the tooth forming portion 3 (or 4) is different, a strain proportional to the distance is generated, but this strain is effectively absorbed. Further, even when the diameter is changed, a particularly large strain occurs in the blank material 1 at the time of molding the tooth portion, and this strain is also absorbed effectively by appropriately setting the width interval of the intermediate portion 2.

Further, even in the case of design changes such as the change of the diameter and the change of the length of the tooth portion t, in the case of the present invention, the partial mold can be replaced, so that it is inexpensive and simple.

In this embodiment, the clutch parts for the transmission are manufactured, but it goes without saying that the invention can be applied to other ring-shaped toothed parts such as belt pulleys and other ring gear parts.

[0031]

As described above, according to the method for manufacturing a toothed cylindrical part of the present invention, the die cost is lower than that of the conventional full-circle tooth-shaped die, and in the conventional case, for example, a press machine of 500 tons or more. Also, what needed a dedicated machine may have a normal press capacity less than that, and even when design changes etc. can be easily handled by exchanging partial molds. Also, the pressing operation itself is simple, and there is no problem such that the molded product sticks to the mold. Moreover, the plate thickness of the blank material does not need to be strictly controlled as in the past. Furthermore, it is possible to obtain a large number of parts at the same time, and moreover, it is possible to manufacture parts of various models at the same time.

[Brief description of drawings]

FIG. 1 is a process diagram showing the first half of the manufacturing process of the present invention.

FIG. 2 is a process diagram showing the latter half of the manufacturing process.

FIG. 3 is a front view of a progressive press die.

FIG. 4 is a side view of the same.

FIG. 5 is an explanatory view when changing the diameter of the two-piece component.

FIG. 6 is an explanatory view when changing the length of the tooth portion of the two-cavity component.

FIG. 7 is a process chart showing a conventional manufacturing process.

[Explanation of symbols]

 1 Blank Material 1a Forming Material 2 Intermediate Part 3, 4 Tooth Part Forming Part 10 Progressive Press Mold a Vertical Side b Horizontal Side t Tooth Part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yorinori Kumagai 1-4-1 Wako-shi, Saitama City Honda R & D Co., Ltd. (72) Manabu Murakami 1-4-1 Wako-shi, Saitama City No. Incorporated in Honda R & D Co., Ltd. (72) Inventor Ken Mizokawa 1-4-1, Chuo, Wako, Saitama No. Incorporated in Honda R & D Co., Ltd. (72) Inventor Kazuo Ando 1-4-1 Chuo, Wako, Saitama

Claims (1)

[Claims] 1. A method of manufacturing a cylindrical component having a tooth portion on an outer peripheral surface thereof, wherein a rectangular blank material is provided with a belt-like intermediate portion having a predetermined width parallel to a vertical side, and a plurality of teeth are provided on both sides of the belt-like intermediate portion. While setting the part forming part, each tooth part is formed in the plurality of tooth part forming parts by a progressive press, and thereafter,
Join the lateral sides of the molding material to form a cylindrical shape, and after that,
A method for manufacturing a toothed cylindrical part, characterized in that the intermediate part is cut to form a plurality of toothed cylindrical parts.