JPH03189044A - Method and device for manufacturing drum direct clutch - Google Patents

Abstract

PURPOSE:To omit the precise machining and to secure the prescribed degree of preci sion by forging a stock to a product shape in advance by hot forging, upsetting it so as to secure the accuracy by cold forging, and thereafter, forming plural grooves by a cold groove blanking process. CONSTITUTION:A stock W0 is heated, and formed to a stock W1 to match a shape of a drum direct clutch by hot forging in an upsetting process. Subsequently, the heated stock W1 is put into a forging die of warm or hot forging and formed to a rough shape of a product. An obtained stock W2 is formed to a product shape W3 by a finished, and thereafter, by regulating its shape by trimming, a product W4 is formed. Next, a Bonderite processing is executed in order that the processing in the next cold forging process and groove blanking process can be executed easily. By this process, the outside diameter dimension of an outside peripheral drum 1 of the product, and its length, and the dimensional accuracy of a side face 2S and a botton face 2B of a V-shaped projecting piece 2 which projects at a prescribed interval on the outside peripheral surface of the drum and formed integrally with the drum are secured. In the end, the groove is formed at a necessary interval in the outside peripheral part of the drum with accuracy determined in advance by a cold blanking process.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for manufacturing a drum direct clutch used in automatic vehicles.

[Conventional technology]

Figure 9 is for automatic passenger cars.

A drum direct clutch as shown in FIG. 10 is used. This type of clutch has many protrusions on the outer periphery, and conventional cold forging technology cannot manufacture it to the required structural and dimensional accuracy, and hot stamping technology solves the structural problem. Even if it were possible, strict dimensional accuracy and quality cannot be ensured, and therefore machining is required. For this reason, this type of clutch is divided into three precisely stamped parts as shown in the above drawing, which are precision punched from sheet metal, and these parts are joined together by welding. Also, instead of sheet metal processing, it is manufactured with a one-piece structure using precision forging.

[11M that the invention seeks to solve] After manufacturing multiple parts using precision sheet metal processing, when combining them together to form an integral structure by welding, a process of forming, processing and assembling each part is required. , which results in high costs. In addition, when using precision forging method,
In order to ensure accuracy, after forging, precision machining of the forged product and dust treatment after molding are required, which also increases costs and also poses problems in terms of strength.

The present invention aims to omit precision machining, ensure a predetermined precision, and manufacture by combining hot or warm #a forging and cold forging.

[Means to solve the problem]

In order to achieve the above object, the present invention hot forges a drum direct clutch for an AT vehicle into a product shape in advance, then cold forges it to ensure the required precision, and then uses a drum direct clutch for an AT vehicle. The plurality of grooves formed on the outer circumference are formed by a cold groove punching process, and the groove punching of the drum is performed by forming a plurality of grooves in the radial direction on the outer circumference of a die holder that holds the inner circumference of the drum part of the product. A punch is arranged so as to be able to slide in the horizontal direction, and a cam driver is vertically installed on the lower surface of the die set, facing the upper surface of the end of the punch, and the cam driver is installed in the center of the lower surface of the die set in cooperation with the die holder to drive the product. A pressure pad is provided to hold the punch, and a plurality of grooves are simultaneously punched in the product drum by the forward sliding movement of the punch.

〔Example〕

The present invention will be explained below based on the illustrated embodiments.

The size of the product, its shape, and
A material WO cut into a predetermined size to suit the volume is heated to a temperature suitable for plastic working of this material, for example 1150°C to 1200°C, and then the material WO heated to this required temperature is heated to a temperature suitable for plastic working of this material. The material W1 is formed by hot forging, that is, plastic working, in the upsetting process in accordance with the shape of the drum direct clutch to be formed. At this time, the outer diameter of the material W1 is formed to match the diameter of the clutch to be manufactured so as to be suitable for the next step of plastic working, as shown in FIG. 1111 (2).

Next, the material Wl heated to the required temperature is put into a forging die for warm or hot forging, and this die is used to form a predetermined rough shape of the product (so-called blocker) as shown in Figure (3). ). The material W2 obtained by this blocker is then processed into a product shape W3 using a punisher in the third step, and is then deburred in a deburring step to be shaped into a product W4. After forming the product into a predetermined shape in the hot or warm forging process, it is subjected to bonderite treatment to facilitate the subsequent cold forging process and groove punching process. The forging process is shown in Figure 1. Next, this is upset by cold forging.

This is the upper and lower mold Kl for cold forging as shown in Figure 5.
, and 2, and the material W4 is upset between the two molds Kl and 2 to obtain the desired precision as a product. Through this process, the outer diameter dimension of the outer peripheral drum 1 of the product, its length (width of the drum), and protrusions at predetermined intervals on the outer peripheral surface of the drum,
Side surface 2S of V-shaped projection piece 2 formed integrally with the drum
The side surface 2S and bottom surface 2B of this projection piece 2, which are designed to ensure the dimensional accuracy of the bottom surface 2B, serve as a reference surface for the material W4 in the groove cutting process.

In addition, in order to make it easier for the eight protruding pieces 2 on the outer periphery of the drum formed in the hot forging process to enter the mold for the next cold forging, the width of the protruding pieces is elongated, as shown in Fig. 2. Ensure that it has the correct width and length during the upsetting process.

In this way, the material WO goes through a hot forging process and then a cold forging process, and as shown in Figure 3, the drum direct clutch that is formed is formed with a predetermined accuracy at the required intervals on the outer circumference of the drum in the final finishing process. The groove 3 is formed by a cold punching process. The device shown in FIGS. 6 to 8 is used for this groove cutting, and this connecting device has a die holder 1 mounted on the die 10 to support the inner peripheral surface of the drum 1 of the product G obtained in the cold process.
1, and a plurality of punching slots 11M are formed at required intervals on the outer periphery of the upper part of the die holder 11 at the positions of the grooves 3 formed in the drum 1 of the product G. In the illustrated embodiment, they are arranged radially at eight locations at equal intervals in the circumferential direction. Reference numeral 12 denotes a knockout ring fitted to the outer periphery of this die holder 11. This knockout ring 12 also has a cut groove at a position facing the punching slot 11M of the die holder so that a punch can be inserted into the slot. (not shown) is formed.

Further, a punch holder 13 is disposed on the outer periphery of the die holder 11 and the knockout ring 12, and punches 14 can be slid radially at required intervals on the outer periphery of the groove 3 of the product drum formed on the punch holder 13. The tip of each punch 14 is a punching male die,
The groove hole 11H of the die holder 11 is used as a female die, and with this female and male die, a plurality of grooves 3 are formed on the outer periphery of the drum 1 by advancing all the punches.
are punched out at the same time. Further, the upper rear end of the punch 14 has an inclined surface 14a, and each inclined surface 14
Cam driver 1 is placed on the bottom surface of die set 15 opposite to a.
6 is installed vertically. In addition, 17 is a punch holder cover that is overlapped and integrated with the punch holder 13, which allows the punches 14 arranged in the radial direction to slide in the radial direction, but does not restrict movement in the vertical direction. be.

The white lower end surface of the cam driver 16 is formed into an inclined surface so as to be slidably in contact with the inclined surface 14a of the punch. Reference numeral 18 denotes a pressure pad, which is disposed at the center of the lower surface of the die set 15, and when the cam driver 16 descends, it simultaneously descends to the permissible position. G, therefore the pressure pad 18
Even if the cam driver descends further after pressing the product G with the required pressing force at , the pressure pad does not descend any further. Note that after the pressure band 18 is lowered to be held by the die holder of the product G, the cam driver is lowered to cut the groove.

In order to punch out the groove 3 in the product drum using the connecting device configured as described above, the product G is placed on the die holder 11. At this time, a groove (not shown) into which the protruding piece 2 protruding from the outer circumferential surface of the drum 1 is fitted is formed in the inner circumferential surface of the knockout ring, thereby accurately positioning the product G.

Next, the pressure pad 18 is lowered to clamp the product G together with the die holder 11. At this time, the inner circumferential surface of the drum of the product is held by a die holder, and the parts other than the continuous punched parts are prevented from being deformed even by the pressing force applied to the drum part by sliding of the punch.

Next, the cam drivers 16, which are hung vertically in a broken line annular shape on the lower surface of the die set, descend all at once, and come into contact with all the punches arranged in the radial direction on the outer periphery of the drum 1. When the punch is pressed through the surface, the vertical pressing blade by the cam driver is converted into a horizontal force and transmitted to the punch 14 by the action of the inclined surfaces 14a and 16a, so that all the punches simultaneously press the product G. The die holder moves forward toward the center of the drum 1, and the inner and outer peripheral surfaces of the drum 1 are held by the knockout rings of the die holder. Grooves are punched out at predetermined positions on the drum 1, thereby forming grooves 3.

After the punches 14 have moved forward by a predetermined distance, when the cam driver is raised, the punches return or retreat in the radial direction due to the pressure of the springs 19 interposed between each punch and the punch holder, and the product G raises the knockout ring. This step is then taken out from the die holder, and this process is repeated one after another to perform cold joint processing with high accuracy.

An explanation of the operation of this joint processing is shown in FIG.

〔Effect of the invention〕

According to the present invention, a drum direct clutch for an AT vehicle is forged in advance into a product shape by hot forging, first, it is then upset by cold forging to ensure the required accuracy, and then formed on the outer periphery of the drum. Since the multiple grooves are formed using a cold groove punching process, precision machining can be omitted and highly accurate products can be manufactured using only the forging process.
It has the advantage of being suitable for mass production, reducing costs, and providing products of uniform quality.

In addition, a plurality of punches are horizontally slidable in the radial direction on the outer circumferential surface of the die holder that holds the inner circumferential surface of the drum part of the product, and the cam driver is set in the die facing the upper surface of the punch end. A pressure pad is provided vertically on the lower surface of the die set, and a pressure pad is provided at the center of the lower surface of the die set to cooperate with the die holder to hold the product, and a plurality of grooves are simultaneously punched in the product drum by the forward sliding movement of the punch. Since the connecting device is configured in this way, it has the advantage that the connecting process can be performed with high precision by cold punching.

[Brief explanation of drawings]

The drawings are one embodiment of the method and apparatus for manufacturing a drum direct clutch according to the present invention. Figure 1 is an explanatory diagram showing the order in which materials are processed in the hot forging process, and Figure 2 is an explanatory diagram showing the order in which materials are processed in the hot forging process. Fig. 3 is an external view of the product obtained by hot forging, Fig. 4 is an external view of the finished product, and Fig. 5 is a cross-sectional view of the cold forging die. Fig. 6 is a vertical new view of the connecting device, Fig. 7 is a plan view of the lower mold, Fig. 8 is an explanatory view of the same operation, Fig. 9 is a sectional view of a known example, and Fig. 10 is a plan view of the same. be. G is the product, 1 is the drum part, 2 is the projection piece, 3 is the groove, 11
is a die set, 14 is a punch, 16 is a cam driver, and 18 is a pressure pad.

Claims (2)

[Claims] (1) A drum direct clutch for an AT vehicle is hot-forged into a product shape, then cold-forged to ensure the required accuracy, and then a plurality of A method for manufacturing a drum direct clutch, characterized in that the grooves are formed by a cold groove punching process. (2) A plurality of punches are horizontally and slidably arranged in the radial direction on the outer circumferential surface of a die holder that holds the inner circumferential surface of the drum part of the product, and a cam driver is placed on the die facing the upper surface of the punch end. A pressure pad is provided vertically on the lower surface of the die set, and a pressure pad is provided at the center of the lower surface of the die set to cooperate with the die holder to hold the product, and multiple grooves are simultaneously punched in the product drum by the forward sliding movement of the punch. A drum direct clutch manufacturing device characterized by the following.