KR100576624B1 - Method for the manufacture of hub-flange for clutch - Google Patents

Abstract

The present invention provides a method of manufacturing a hub flange for a clutch that can finish an intermediate square hole and a central spline hole with high precision, and can reduce manufacturing cost.

For intermediate products produced by tapping by hot forging, hot punching punches the outer periphery, the recesses Hc, the middle square holes Ha and Hb, and the central spline hole Hs by hot punching. After that, cold ironing finishes the outer circumference, the recess Hc in the outer circumference, the middle square holes Ha and Hb, and the central spline hole Hs.

Description

Manufacturing method of hub flange for clutch {METHOD FOR THE MANUFACTURE OF HUB-FLANGE FOR CLUTCH}

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of the hub flange for clutches, (a) is a top view, (b) is sectional drawing along the line A-A of (a);

2 is an explanatory view showing a molding process of a method for manufacturing a clutch hub flange of the present invention;

3 is an explanatory view showing an example of a cold ironing device which performs the ironing step of the method for manufacturing a clutch hub flange for clutch of the present invention; And

4 is an explanatory view showing a molding step of a conventional method for manufacturing a clutch hub flange.

(Explanation of symbols for the main parts of the drawing)

W ‥‥ Clutch hub flange (product) Wa ‥‥ Flange

Wb ‥‥ Boss part Ha ‥‥ Square hole

Hb ‥‥ Square hole Hc ‥‥ Outer recess

Hs ‥‥ Spline Hole W0 ‥‥ Material

W1 ‥‥ 1st intermediate product W2 ‥‥ 2nd intermediate product

W3 ‥‥ Third intermediate product M ‥‥ Cold ironing device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a hub flange for clutches, and more particularly, to a method for manufacturing a hub flange for clutches which enables high precision finishing of a middle square hole and a central spline hole.

Clutch discs in manual clutches used in automobiles and the like are used to transmit the rotational force of the engine to the transmission, but usually the engine is accompanied by rotational fluctuations. Will occur.

In order to prevent this, the clutch disk is usually assembled with a torsion spring and a friction washer to absorb rotational fluctuations of the engine and reduce unpleasant vibrations and noises.

As shown in Fig. 1, the hub flange W, which is a main component of the clutch disc, has a thin flange portion Wa on the outer circumference side and a thick boss portion Wb on the inner circumference side, and the flange portion Wa ), A plurality of large and small square holes (Ha and Hb) for accommodating the concave portion Hc in the outer circumference and a torsion spring in the middle thereof (in this example, three large and small ones), and the center of the boss portion Wb. It is comprised so that each may form the release spline hole Hs which accommodates the shaft of an apparatus.

Finishing with high precision the square holes Ha and Hb for accommodating the torsion springs formed in the middle of the flange portion Wa of the clutch hub flange W, that is, the shape and position of the square holes Ha and Hb. In addition, since the circumferential surface is always in contact with the torsion spring, it is required to form a smooth surface to reduce wear.

This is because (1) engines have different rotational variations depending on the type of engine, so it is necessary to set (tuning) the torsion spring for each type of engine. The operating condition of the spring is changed, and it greatly affects the dustproof and soundproof performance.

(2) Three to six torsion springs are usually used. However, if each of the torsion springs is not evenly arranged, a load is applied only to a part of the torsion springs, and the torsion springs are bent and broken, thereby deteriorating the durability of the clutch disc. Cause.

(3) Since the torsion spring and the side surfaces of the square holes Ha and Hb are in contact with each other to transmit the engine power, a small contact area of the two leads to a high pressure, leading to premature wear on both parts, and a reduction in the durability of the clutch disc. Cause.

Therefore, the clutch hub flange W for the clutch is conventionally, as shown in Fig. 4, (1) cutting step of the raw material W0 → (2) heating step → (3) tapping step (hot forging) → ( 4) Finishing process (hot forging) → (5) Punching process (Hot punching forms donut-shaped intermediate product (W1 ') with a circular boss and a hole in the center) → (6 ) Normalizing process → (7) Shot blast process → (8) Turning process (turning inside and outside diameter and cross section of flange and boss) → (9) Punching process (cold forming, recessed part (Hc) ) And square holes (Ha, Hb) are punched by press, press shaving to form intermediate product (W2 ') → (10) Broach process (machining, spline hole (Hs) ) Was broached, and the hub flange (W) was manufactured through each step of molding).

However, the conventional manufacturing method of the hub flange for clutch has the following problem.

(1) For example, in the case of using a plate having a thickness of about 6 to 10 mm, it is difficult to secure the dimensional accuracy and the flatness of the fracture surface in the punching step of (9) performed by cold, and press shaving after punching Even if it is carried out, it is difficult to secure the precision of the square holes Ha and Hb which require especially high precision.

(2) In the punching step (9) to be performed cold, the plate thickness of the flange portion Wa and the plate thickness of the boss portion Wb are different, and therefore, particularly, bend to a punch punching the square holes Ha and Hb. Stress is applied and the life of a punch falls.

(3) Remaining care is required for the broaching step (10) performed by machining. (The spline hole (Hs) is punched by a press by cold pressing, shaping is not possible from the viewpoint of ensuring accuracy).

SUMMARY OF THE INVENTION In view of the problems in the conventional method for manufacturing a clutch hub flange for the clutch, the present invention can finish the middle square hole and the central spline hole with high precision and reduce the manufacturing cost of the clutch hub flange. An object of the present invention is to provide a manufacturing method.

In order to achieve the above object, the manufacturing method of the hub flange for clutch of the present invention is the intermediate product made by tapping by hot forging, the outer periphery by the hot punching, the recess of the outer periphery, the middle square hole and the central spline After the hole is punched, the outer periphery, the recess of the outer periphery, the middle square hole and the center spline hole are finished by cold ironing.

The manufacturing method of the hub flange for clutch is used for cold ironing after punching the outer periphery, the recess of the outer periphery, the center square hole and the center spline hole by hot punching on the intermediate product that is formed by hot forging. By finishing the outer periphery, the recess of the outer periphery, the center square hole and the center spline hole, in particular, the middle square hole and the center spline hole can be finished with high precision, and the load applied to the manufacturing apparatus is small. can do.

In this case, by hot punching, the recesses of the outer circumference and the outer circumference are punched 0.05 to 0.3 mm larger than the final finishing dimension, and the middle square hole and the center spline hole are punched 0.05 to 0.3 mm smaller than the final finishing dimension. .

As a result, the effect of heat shrinkage of the intermediate product can be eliminated, and the cold ironing of the post-process can easily finish the outer periphery, the recess of the outer periphery, the middle square hole, and the central spline hole with high precision. .
Specifically, if it is less than 0.05 mm, which is the lower limit of the numerical limits on both sides, it is difficult to exclude the influence of the heat shrinkage of the intermediate product, and when the upper limit exceeds 0.3 mm, cold ironing of the post-process becomes difficult. It is not possible to finish the product with high precision even on the side.

Further, the punching by hot punching or the cold ironing of the concave portion of the outer periphery, the middle square hole and the center spline hole can be performed simultaneously.

This eliminates the error in the relative positional relationship between the outer periphery, the recess of the outer periphery, the middle square hole and the center spline hole, and the punching by hot punching and the finishing by cold ironing can be performed in one step. Can be.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of the manufacturing method of the clutch hub flange of this invention is described based on drawing.

The manufacturing method of the clutch hub flange of this invention is demonstrated using FIG. 2 about the case where the clutch hub flange W shown in FIG. 1 is manufactured.

First, a material suitable for the hub flange W to be manufactured is cut into a predetermined size using a billet shear or a saw (cutting process (Fig. 2 (1))).

The material W0 is heated to a temperature suitable for hot forging, for example, 1180 ° C. (heating step (FIG. 2 (2))).

This heating temperature can be determined according to the material of the material W0 or the like.

After heating, the raw material W0 is subjected to a plurality of hot forging processes, that is, a conventional tapping process (FIG. 2 (3)), a blocker process (FIG. 2 (4)), and a finishing process (FIG. 2 (5)). ), The first intermediate product W1 is formed by tapping.

Next, the first intermediate product W1 is hot-punched to punch the outer periphery, the recesses Hc in the outer periphery, the middle square holes Ha and Hb, and the central spline hole Hs. 2 intermediate products W2 are formed (punching process (FIG. 2 (6)).

In this case, the influence of the heat shrink of the second intermediate product W2 is eliminated, and the recessed portion Hc of the outer circumference, the outer circumference of the hub flange W and the middle square hole ( In order to easily finish the Ha, Hb) and the central spline hole Hs with high precision, the outer and outer recesses Hc are punched slightly larger than the final finishing dimension, specifically, 0.05 to 0.3 mm larger on one side. The middle square holes Ha and Hb and the central spline hole Hs are punched slightly smaller than the final finishing dimension, specifically 0.05 to 0.3 mm smaller on one side.

Further, the punching of the outer circumference of the hub flange W, the recess circumference of the outer circumference Hc, the middle square hole Ha, Hb, and the central spline hole Hs is carried out at the same time as the cold ironing process of the later step. It is preferable to carry out. For this reason, the error of the relative positional relationship of the outer periphery, the recess of the outer periphery, the middle square hole, and the center spline hole can be eliminated, and punching can be performed in one step.

The second intermediate product W2 formed by roughly forming the predetermined recess Hc, the middle square holes Ha and Hb, and the central spline hole Hs by the above-described process is cooled or cooled. Annealing or soaking is performed at low temperature (heat treatment step (FIG. 2 (7))), and the scale adhered to the surface of the second intermediate product W2 by shot blasting is removed (shot blasting). Process (FIG. 2 (8)), a lubrication process, such as a bonderite process, a bonderlube process, and the treatment with a molybdenum disulfide type lubricant, is performed as needed (lubrication process process (FIG. 2 (9)). ).

The second intermediate product W2 subjected to the surface treatment is cold ironed to finish the outer circumference, the recess Hc in the outer circumference, the middle square holes Ha and Hb, and the central spline hole Hs. The intermediate product W3 is formed (ironing process (FIG. 2 (10)).

In this case, the recessed portion Hc of the second intermediate product W2 subjected to the surface treatment is formed by a cold ironing die having an approach portion (R portion) at its tip and an intermediate square hole. (Ha, Hb) and the center spline hole Hs are ironed and finished by the cold ironing punch which has the approach part R part at the front-end | tip. For this reason, the outer periphery of the hub flange W, the recessed part Hc of the outer periphery, the middle square hole Ha, Hb, and the center spline hole Hs can be smoothly completed with high precision.

In addition, cold ironing of the outer circumference of the hub flange W, the recess Hc of the outer circumference, the middle square holes Ha and Hb, and the central spline hole Hs is preferably performed simultaneously. For this reason, the error of the relative positional relationship of the outer periphery, the recess of the outer periphery, the middle square hole, and the center spline hole can be eliminated, and finishing can be performed in one step.

An example of the cold ironing apparatus for implementing this ironing process is shown in FIG.

The cold ironing apparatus M is a cold ironing die composed of a die 1, a square hole punch 2 and 3, a spline hole punch 4 and an upper punch 5 in a general-purpose press device, Press slide (6) to attach the upper punch (5), workpiece push up (7), knock out pin (8), knock out bar (9), knock out pin (10), jesper pin (jesper pin) (11) and the like are configured.

In this case, as described above, the die 1, the punches 2 and 3 for the square hole, and the punch 4 for the spline hole form an approach portion R portion at the tip.

Then, the surface-treated second intermediate product W2 is inserted into an approach portion of the die 1, the square hole punches 2 and 3 and the spline hole punch 4 constituting the cold ironing die ( The lower half of Fig. 4), the second intermediate product W2 is pushed down by the upper punch 5 by lowering the press slide 6, the recessed portion Hc of the outer circumference and the outer circumference by cold ironing, The middle square holes Ha and Hb and the center spline hole Hs are finished (right half figure of FIG. 4).

Then, when pressing down by the upper punch 5 by lifting the press slide 6, the jasper pin 11 protrudes by the pressing force of a spring, and the 3rd intermediate product W3 iron-molded. By preventing the rise with the upper punch 5, the upper punch 5 is raised and the knockout pin 10 is pushed up by the hydraulic cushion, thereby allowing the work piece through the knockout bar 9 and the knockout pin 8; The push-up bracket 7 is pushed up, and cold ironing finishes the outer periphery, the recesses Hc, the middle square holes Ha and Hb, and the central spline hole Hs by cold ironing to finish the third intermediate product ( W3) is obtained.

Next, the cross section of this third intermediate product W3 is turned (turning step (Fig. 2 (11))) to obtain a clutch hub flange as a product.

The manufacturing method of the clutch hub flange made of the above process has the following advantages.

(1) Since the first intermediate product W1 is hot-punched, the outer periphery, the recesses Hc of the outer periphery, the middle square holes Ha and Hb, and the central spline hole Hs are punched out. The punched shear surface is a straight cut surface, and a good punching surface with high flatness is obtained.

(2) Since the punching is performed hot, the outer periphery, the outer periphery concave portion Hc, the middle square holes Ha and Hb, and the spline hole Hs in the center, in particular, the center of the thick boss portion Wb The spline hole of can be punched easily. Further, even when the plate thickness of the flange portion Wa and the plate thickness of the boss portion Wb are different, very large bending stresses are not applied to the punches punching the square holes Ha and Hb. As a result, the service life of a tool such as a punch can be extended, thereby reducing the tool cost.

(3) Since the central spline hole Hs can be formed by punching, the broach process performed by conventional machining is unnecessary, and the turning of the hub flange W is performed by the cross section of the third intermediate product W3. Since only turning is possible, the manufacturing cost of the hub flange W can be greatly reduced.

(4) By hot punching, the recesses Hc of the outer circumference and the outer circumference are punched slightly larger than the final finishing dimension, and the middle square holes Ha, Hb and the central spline hole Hs are slightly smaller than the final finishing dimension. By punching small, the influence of the heat shrinkage of the second intermediate product W2 can be eliminated, and the recessed portion Hc of the outer circumference and the outer circumference by the cold ironing of the post-process and the square holes H and Hb in the middle. And central spline hole Hs can be finished easily and with high precision.

According to the method of manufacturing a hub flange for a clutch of the present invention, after punching out an outer circumference, a concave portion of a circumference, a middle square hole and a center spline hole by hot punching, the intermediate product is formed by tapping by hot forging. Since cold ironing finishes the outer periphery, the recess of the outer periphery, the middle square hole and the center spline hole, in particular, the middle square hole and the center spline hole can be finished with high precision and added to the manufacturing apparatus. Losing load can reduce the manufacturing cost of the hub flange, including the cost of building and maintaining the manufacturing equipment.

In addition, by hot punching, recesses in the outer circumference and outer circumference are punched 0.05 to 0.3 mm larger than the final finishing dimension, and the middle square hole and the central spline hole are punched 0.05 to 0.3 mm smaller than the final finishing dimension, thereby making the intermediate product In addition, the influence of thermal contraction can be eliminated, and the spline hole of the outer periphery, the recess of the outer periphery, and the middle rectangular hole can be easily finished with high precision by cold ironing of the post process.

Further, by simultaneously punching by hot punching or finishing by cold ironing of the outer periphery, the recess of the outer periphery, the middle square hole and the center spline hole, respectively, the outer periphery, the recess of the outer periphery, the middle square hole and the center It is possible to eliminate the error of the relative positional relationship of the spline hole, to further improve the forming precision of the hub flange, and to perform the punching by hot punching and the finishing by cold ironing in one step. You can save even more.

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Claims (3)

For the intermediate product patted by hot forging, the outer periphery, the outer periphery, the middle square hole and the center spline hole are punched out by hot punching, and then the cold periphery the concave, periphery, In the manufacturing method of the clutch hub flange for finishing the middle square hole and the center spline hole, By hot punching, the outer and outer recesses are punched 0.05 mm to 0.3 mm larger than the final finishing dimension, and the middle square hole and the central spline hole are punched 0.05 mm to 0.3 mm smaller than the final finishing dimension. Clutch hub flange manufacturing method. delete The method of manufacturing a hub flange for a clutch according to claim 1, wherein the punching by hot punching or the finishing by cold ironing of the outer periphery, the recess of the outer periphery, the middle square hole and the central spline hole are simultaneously performed. .

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