JPH0773771B2 - Drum direct clutch manufacturing method and manufacturing apparatus - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method and an apparatus for manufacturing a drum direct clutch used in an automatic vehicle.

[Conventional technology]

Drum direct clutches as shown in FIGS. 9 and 10 are used in automatic vehicles.

This type of drum direct clutch has a large number of protrusions on the outer circumference, and cannot be manufactured by the conventional cold forging technology because of its structure. Even if the above problem can be solved, strict dimensional accuracy and quality cannot be secured, which requires machining.

For this reason, conventionally, as shown in the figure, the drum direct clutch is divided into three parts to make a precision punched product by sheet metal, and each component is integrally manufactured by welding or manufactured by a precision forging method. ing.

[Problems to be Solved by the Invention]

When a plurality of parts are manufactured by sheet metal working and then combined with each other to form an integral structure by welding, the steps of molding, processing and assembling each part are required, resulting in high cost.

Further, in the case of the precision forging method, in order to ensure accuracy, it is necessary to perform precision machining of the forged product and dust treatment after molding, resulting in high cost and a problem in strength.

An object of the present invention is to provide a method and an apparatus for manufacturing a drum direct clutch, which can reduce the cost by omitting precision machining and can obtain a highly accurate product.

[Means for Solving the Problems]

In order to achieve the above object, the method for manufacturing a drum direct clutch of the present invention is a hot or warm forging step,
In the cold forging process, the material is forged into a product that has a protruding piece that is longer than the finishing dimension on the outer peripheral surface of the drum,
The gist of the present invention is to install a product into a product having a required finishing dimension and punch a plurality of grooves in a drum portion of the product at the same time by sliding a plurality of punches in a horizontal direction in a cold punching process.

Further, the drum direct clutch manufacturing apparatus of the present invention has a slot, and a plurality of punches can be slid horizontally in the radial direction on the outer peripheral surface of the die holder that holds the inner peripheral surface of the drum portion of the product. , A cam driver having an inclined surface facing the inclined surface formed at the end of the punch is hung vertically in the die set, and a pressure pad that holds the product in cooperation with the die holder is installed in the center of the die set. The gist is that a plurality of grooves are punched simultaneously in the drum portion of the product by sliding the punch horizontally.

〔Example〕

 Hereinafter, the present invention will be described based on the illustrated embodiments.

As shown in FIG. 1, a rod-shaped material made of a material suitable for a drum direct clutch (for example, carbon steel) is cut into a predetermined size suitable for the size, shape and volume of the product. Prepared material W0 (Fig. 1 (1)) at a temperature suitable for plastic working of this material, for example, 1150 ℃ to 1200 ℃
Then, the raw material W0 heated to the required temperature is hot forged in accordance with the shape of the drum direct clutch that forms the raw material W0 to form the raw material W1 (Fig. 1 (2)).

At this time, the outer diameter of the material W1 is formed according to the diameter of the clutch to be manufactured so as to be suitable for the plastic working in the next step.

Next, the raw material W1 heated to the required temperature is put into a forging die for warm or hot forging, and with this die, a raw material W2 (so-called blocker) of a predetermined product rough shape (see FIG. 1) (3))
To mold.

Next, after the material W2 obtained by this blocker is made into a product shape material W3 (Fig. 1 (4)) by the finisher in the third step, it is deburred in the deburring step to adjust the shape of the product W4. (See FIG. 1 (5)).

After forming into a predetermined product shape in the hot or warm forging step as described above, a bonderite treatment is performed to facilitate the subsequent cold forging step and groove punching step.

Next, the product W4 is set up by cold forging.

This is the upper and lower molds K1 and K for cold forging as shown in Fig. 5.
2 is used, and the material W4 is installed between both molds K1 and K2 so as to obtain a desired finishing dimension (finishing accuracy) as a product.

By this process, the outer diameter of the drum portion 1 of the product and its length (width of the drum) and the V-shaped projection piece 2 which is formed integrally with the drum and projects on the outer peripheral surface of the drum portion 1 at a predetermined interval.
Make sure to secure the dimensional accuracy of the side surface 2S and the bottom surface 2B. The side surface 2S and the bottom surface 2B of the protruding piece 2 serve as a reference surface of the material W4 in the cold punching process described later.

In addition, as shown in FIG. 2, the eight protruding pieces 2 on the outer peripheral portion of the drum formed in the hot forging step have a narrow width for the protruding pieces in order to easily enter the cold forging die. Form and have a regular width and length during the upsetting process.

Thus, the raw material W0 becomes the product shown in FIG. 3 through the hot forging process and the cold forging process, and the product is cold punched to obtain the predetermined accuracy on the outer periphery of the drum. The groove 3 is formed by the above to form the final product drum direct clutch shown in FIG.

In this cold punching step, the groove punching device shown in FIGS. 6 to 8 is used.

This groove punching device is provided with a die holder 11 for supporting the inner peripheral surface of the drum portion 1 of the product G obtained in the cold forging process on the die 10, and the die holder 11 is provided with the product on the outer periphery of the upper part thereof. Plural slot holes 11H for punching are formed at required intervals at the positions of the grooves 3 formed in the G drum portion 1. In the illustrated embodiment, the slots 11H are arranged radially at eight locations at equal intervals in the circumferential direction.

A knockout ring 12 is fitted on the outer periphery of the die holder 11. This knockout ring 12 also has a die holder
A kerf (not shown) at a position facing the punching slot 11H of 11
To form.

A punch holder 13 is arranged at the outer peripheral portion of the die holder 11 and the knockout ring 12, that is, at the outer peripheral position of the product G, and a plurality of punches 14 are arranged on the punch holder 13 so as to be radially slidable at required intervals. Set up.

The rear end of each punch 14 is formed on an inclined surface 14a.
And the inclined surface 14a formed at the lower end of the cam driver 16 vertically provided on the lower surface of the die set 15 face each other and are in sliding contact with each other.

17 is a punch holder cover, and the punch holder 13
The punches 14 that are stacked on top of each other and are arranged in an array in the radial direction restrict the movement in the vertical direction while permitting sliding in the radial direction.

The tip of each punch 14 is a punching male type, and the slot 11H of the die holder 11 is a female type, and a plurality of punches 14 are simultaneously slid horizontally to form a plurality of grooves on the drum part 1. Try to punch 3.

Reference numeral 18 denotes a pressure pad, which is arranged at a central position on the lower surface of the die set 15, and when the cam driver 16 descends, simultaneously descends to a permitted position and cooperates with the die holder 11 to hold the product G. The pressure pad 18 is
After pressing the product G with the required pressing force, the cam driver 16
It is configured so that even if it descends further, it will not descend further.

In order to punch the groove 3 in the drum portion 1 of the product G with the groove punching device configured as described above, the protrusion piece 2 formed on the outer peripheral surface of the drum portion 1 of the product G is inserted into the knockout ring 12. The die holder 11 is fitted into a groove (not shown) formed on the peripheral surface, thereby accurately positioning the product G.
Place product G on top.

Next, the die set 15 is lowered to lower the pressure pad 18 together with the cam driver 16 to clamp the product G between the die holders 11. At this time, the inner peripheral surface of the drum portion 1 of the product G is held by the die holder 11, and even if a pressing force acts on the drum portion 1 by the sliding of the punch 14, only the groove 3 is deformed. To do so.

When the cam driver 16 vertically hung on the die set 15 descends, the inclined surfaces 16a of the cam driver 16 come into contact with all the punches 14 arranged on the outer periphery of the drum portion 1 and in the radial direction, and By pressing the inclined surface 14a,
The vertical pushing force of the cam driver 16 is the inclined surface 16a.
And the action of the inclined surface 14a is converted into a force in the horizontal direction and transmitted to the punch 14, whereby all the punches 14 slide toward the center of the product G at the same time, and the die holder 11 and the knockout ring 12 move the drum. The groove 3 is formed by cold punching at a predetermined position of the drum portion 1 which holds the inner and outer peripheral surfaces of the portion 1.

After the punch 14 slides for a predetermined distance, when the cam driver 16 is raised, the punch 14 returns by the pressure of the spring 19 interposed between each punch 14 and the punch holder 13, that is, the punch 14 retreats in the radial direction. G is taken out from the die holder 11 when the knockout ring 12 rises.

The cold groove punching process is completed.

〔The invention's effect〕

According to the method for manufacturing a drum direct clutch of the present invention, by combining a predetermined hot or warm forging step, a cold forging step and a cold stamping step, it is possible to obtain a highly accurate product. It is possible to reduce the manufacturing cost of the drum direct clutch by omitting precision machining and mass-produce uniform high-quality products.

Further, according to the drum direct clutch manufacturing apparatus of the present invention, the groove of the drum portion of the drum direct clutch is
By cold stamping, it can be formed accurately and efficiently.

[Brief description of drawings]

Fig. 1 is an explanatory view showing the sequence of processing the material in the hot forging process, Fig. 2 is an explanatory diagram for performing the upsetting process of the protruding piece in the cold forging process, and Fig. 3 is obtained by the cold forging. External view of the product,
FIG. 4 is an external view of the finished product, FIG. 5 is a cross-sectional view of the cold forging die, FIG. 6 is a vertical cross-sectional view of the groove punching device, FIG. 7 is a plan view of the lower die, and FIG. 8 is FIG. 9 is a sectional view of a known example, and FIG. 10 is a plan view of the same. G is a product, 1 is a drum part, 2 is a protruding piece, 3 is a groove, 11 is a die holder, 14 is a punch, 15 is a die set, 16 is a cam driver, and 18 is a pressure pad.

Claims (2)

[Claims] 1. In a hot or warm forging process, a material (W
0) is forged on the outer peripheral surface of the drum part (1) to a product (W4) having a protruding piece (2) having a shape longer than the finished size, and in the cold forging process, the product (W4) is a product with the required finished size In the cold punching process, the punches (14) are set in (G) and a plurality of grooves (3) are punched simultaneously in the drum part (1) of the product (G) by sliding a plurality of punches (14) in the horizontal direction. A method for manufacturing a drum direct clutch, which is characterized by pulling out. 2. A plurality of punches (14) in a radial direction on an outer peripheral surface of a die holder (11) having a groove hole (11H) and holding an inner peripheral surface of a drum portion (1) of a product (G). A cam driver (16) having a slanted surface (16a) facing the slanted surface (14a) formed at the end of the punch (14) and mounted on the die set (15). Set the die set (1
A pressure pad (18) for holding the product in cooperation with the die holder (11) is provided at the center of the product (5), and the punch (14) is slid horizontally to allow the product drum part (1).
An apparatus for manufacturing a drum direct clutch, wherein a plurality of grooves (3) are punched simultaneously.