JPH0137217B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a method for manufacturing a multi-groove V pulley in which a separation band portion is formed between multi-stage V grooves, and in particular to a method for manufacturing the separation band portion in a good and easy manner. It is related to molding technology.

(Background Art) The multi-groove V-pulley with a separation band as described above generally has a plurality of V-grooves extending in the circumferential direction in multiple stages in the axial direction on the cylindrical outer peripheral surface of the pulley material, which has a substantially bottomed cylindrical shape. At the same time, an annular convex separation band portion is formed along the circumferential direction in the axially intermediate portion to divide the plurality of V grooves into a plurality of groups, and a specific example thereof is shown in Fig. 8. is shown. In the multi-groove V pulley 50 illustrated here, seven V-grooves 52 are divided into two parts, a 3-groove and a 4-groove, by a separation band part 54. V belts 56 and 58 each having a number of V protrusions corresponding to the number of grooves are wound around each other, and are used, for example, to transmit rotational force to two or more transmission systems.

By the way, it is conceivable that the multi-stage V grooves 52 and separation strip portions 54 of such a multi-groove V pulley 50 are simultaneously rolled using a rolling roller 60 as shown in FIG. 9, for example. However, in this case, although the plurality of V-grooves 52 can be formed without difficulty, it is necessary to move a lot of excess material to the separation strip portion 54, and the excess material from the V-grooves 52 on both sides of the separation strip portion 54 needs to be moved. Therefore, it is difficult to sufficiently build up the separation band portion 52, and as a result, it is unavoidable that the top portion A of the separation band portion 52 is left with insufficient thickness, and cannot be provided as a pulley product. Further, if the pressing force of the rolling roller 60 is increased in order to increase the amount of excess thickness, defects such as a seam may occur at the bottom of the V-groove 52. Therefore, conventionally, multi-stage V
The grooves 52 and the separation strips 54 were formed by cutting using a full-sized cutting tool or the like.

(Problem to be solved by the invention) However, productivity and material yield are poor in such cutting processing, and in general, multi-groove V pulleys are often machined from sheet metal material, and the final V The fact that the grooves and separation strips must be formed by cutting hinders the flow of a series of processes.
Also, from the viewpoint of strength, the flow of the metal structure is divided, which is not preferable.

(Means for Solving the Problems) The present invention has been made against the background of the above-mentioned circumstances, and when manufacturing a multi-groove V pulley with a separation band as described above, the separation The purpose is to form a band portion or a multi-stage V-groove in a good manner by rolling. For this purpose, in the present invention, a metal plate material is formed into a substantially bottomed cylindrical shape, flanges are formed at both ends of the peripheral wall to form a preformed product, and then the preformed product is rotated while A rolling roller that forms the plurality of V grooves and an annular convex separation band portion by plastic flow is pressed onto the peripheral wall portion between the flange portions, and the separation band portion of the rolling roller is formed. An annular convex portion extending in the circumferential direction is formed on the bottom surface of the annular recess, which is the part where the separation band is formed, and the separation band portion is raised by the forming action of the rolling roller, and an annular concave portion is formed on the top portion of the separation band portion. was formed.

(Operations and Effects) With this arrangement, the annular convex portion of the rolling roller presses the part of the preform that is to become the separation band, and the excess thickness that is raised thereby becomes part of the separation band. As a result, the excess metal supplements the amount of excess metal raised from the V-groove portions on both sides of the separation band, and as a result, the excess metal jointly fills the separation band, causing the top portion of the separation band to It is now possible to easily manufacture a multi-groove V-pulley with a healthy and good-looking separation band portion without causing underfilling or seams caused by excessive pressure of the rolling roller. It was.

Note that if the peripheral wall portion of the preformed product that is to become the separation strip is formed as a built-up portion in advance before rolling with a forming roller, the excess required for raising the separation strip can be reduced. Since the amount of movement of the meat is small, the annular concave portion to be formed in the separation band portion, in other words, the annular convex portion on the rolling roller side need only be smaller.

(Example) Next, in order to clarify the present invention more specifically, a specific example of the manufacturing method according to the present invention will be described in detail based on the drawings.

First, FIGS. 3a to 3d show an example of a process for obtaining a preform when manufacturing a multi-groove V-pulley according to the method of the present invention. To explain this simply, first, as shown in a, a circularly punched metal plate material 2 is subjected to a prescribed deep drawing process, etc., to form a cup-shaped molded product that has an almost bottomed cylindrical shape as shown in b. Set it to 4. Then, as shown in c,
While rotating this cup-shaped molded product 4 around the center line, a pair of flange-forming rollers 6, 6 are pressed against both ends of its peripheral wall, and at the same time, pressure is applied to the cup-shaped molded product 4 from both sides in the axial direction. The flange forming rollers 6, 6 are brought close to each other while being pressed. As a result, flange portions 8, 8 are formed at both ends of the peripheral wall of the cup-shaped molded product 4, and the portion of the peripheral wall between the flange portions 8 is curved. Next, while rotating the cup-shaped molded product 4 on which the flange portion 8 is formed, a thickening roller 10 is pressed against the curved peripheral wall portion of the molded product 4 to flatten it, as shown in d. By doing so, the circumferential wall portion is temporarily made thicker than the other portions, and a preformed product 12 is obtained.
The reason for increasing the thickness in this manner is to facilitate V-groove forming, etc., which will be performed later.

Here, as shown in FIG. 4, an annular circumferential groove 14 extending in the circumferential direction is formed on the cylindrical outer peripheral surface of the thickened roller 10.
It is desirable to form a built-up portion 16 in advance in a portion of the preformed product 12 that is to become a separation band portion by pressing the curved peripheral wall portion of the cup-shaped molded product 4 evenly. It is preferable that the height of this built-up portion 16 is lower than the height of the separation band portion that will be formed later.

Next, while rotating such preformed product 12 around its center line, a rolling roller 1 as shown in FIG.
8 will be forced. This rolling roller 18
is the target pulley product 2 shown in FIG.
7 V protrusions 24 for forming 0 multi-stage V grooves 22 (7 grooves in this example), and these V grooves 22 are divided into two groups of 3 grooves and 4 grooves at the middle part in the axial direction. An annular recess 28 for forming a convex annular separation band 26 is provided on the outer circumferential surface of the cylinder. Furthermore, this rolling roller 18
An annular convex portion 30 extending in the circumferential direction is formed on the bottom surface of the annular recess 28 . This annular convex portion 30
is for forming an annular recess 32 having a substantially trapezoidal cross-sectional shape, located at the widthwise center of the annular recess 28, and extending circumferentially at the top of the separation strip 26. be.

Then, such a rolling roller 18 is
6, the shape of the outer circumferential surface of the rolling roller 18 is changed to the preform by pressing it against the outer circumferential surface of the circumferential wall of the preform 12 on which the built-up part 16 is formed and rolling it against each other. It is applied to the peripheral wall of the molded product 12. At this time, each of the V protrusions 24 of the rolling roller 18
The flesh portions cut into the outer circumferential surface of the circumferential wall to form V grooves 22, respectively, and the flesh portions pushed aside as a result of the V-grooves 22
It is moved to the valley between 4 and becomes a mountain. Also,
V protrusions 24, 24 located on both sides of the annular recess 28
A part of the excess thickness generated by the biting moves so as to bulge up the separation band part 26, and the annular convex part 30 in the annular recess 28 moves around the tip of the built-up part 16 shown in FIG. It gets dug into the face. FIG. 7 conceptually shows the movement of excess meat due to such biting.

As is clear from this figure, when the annular convex portion 30 bites into the center of the built-up portion 16, the displaced excess thickness a ₁ and a ₂ is moved so as to bulge on both sides, and the top of the separation strip portion 26 is moved. will be allocated to a portion of the amount. These extra thickness a ₁ and a ₂ form the separation band portion 26
Excess thickness raised from the V-groove molded parts 22 on both sides of
together with b ₁ and b ₂ form the top portion of the separation strip portion 26;
As a result, at the center of the top of the separation strip section 26,
This results in an annular recess 32 that is a trace of the displaced excess material.

In this way, in addition to the extra thickness being pushed away by the annular convex portion 30 of the rolling roller 18, since the portion that should become the separation band portion 26 is previously formed as the built-up portion 16, the separation band portion 26 is The amount of excess meat that needs to be moved for heaping up is small, and the balance is maintained so that the amount of excess meat that is pushed away and the amount of meat required for heaping up is almost equal, so the top part of the separation strip 26 has an attractive appearance. Separation band portions 26 with good surface quality can be obtained without causing bad underfilling. Furthermore, since the necessary raised excess thickness can be obtained without difficulty, there is no fear that the rolling pulley 18 will be pressed too much and a seam or the like will be formed at the bottom of the V-groove 22.

Although it is a preferable embodiment to form the above-mentioned built-up portion 16 in advance on the portion that is to become the separation band portion 26 before rolling the V-groove 22 and the separation band portion 26, If the width and height of the annular protrusion 30 of the rolling pulley 18 are increased to increase its cross-sectional shape, thereby increasing the amount of excess material that the annular protrusion 30 can displace, the above-mentioned problem can be achieved. It is also possible to omit the formation of the built-up portion 16 as shown in FIG. In addition, in the case of the above example, as shown in Figure 3d, the circumferential wall of the preform was subjected to a step of thickening before groove forming, etc., but the desired depth of the V-groove was If the thickness is relatively shallow, the thickening process described above may be omitted.

Furthermore, in the above explanation, an example of manufacturing a multi-groove V pulley having one separation band portion was shown, but the present invention also relates to manufacturing a multi-groove V pulley having two or more separation band portions. It can also be applied to V
The number of grooves is also not limited to those in the previous example.

In addition, although specific explanations are omitted, the present invention includes various modifications based on the knowledge of those skilled in the art.

[Brief explanation of drawings]

FIG. 1 shows a multi-groove V manufactured by the method of the present invention.
It is a partial sectional view showing one example of a pulley, and the second
The figure is a partial sectional view showing an example of a rolling roller used for rolling the V-pulley. FIG. 3 is a process diagram showing a specific example of manufacturing a preformed product,
FIG. 4 is an explanatory diagram showing an example of a method of forming a built-up portion in advance on a preform. Figures 5 and 6
The drawings are explanatory diagrams chronologically showing the processing steps using the rolling roller shown in FIG. 2. FIG. 7 is an explanatory diagram conceptually showing the movement of the excess thickness due to the rolling forming of the rolling roller. FIG. 8 is a partial cross-sectional view showing an example of a conventional multi-groove V pulley with a separation band, and FIG. 9 is a partial cross-sectional view of a rolling roller that can be considered when forming the same by rolling processing. . 2: Metal plate material, 4: Cup-shaped molded product, 6: Flange forming roller, 8: Flange portion, 10: Thickened roller, 12: Preformed product, 14: Circumferential groove, 1
6: Overlay portion, 18: Rolling roller, 20: Pulley product, 22: V groove, 24: V protrusion, 26: Separation band portion, 28: Annular recess, 30: Annular convex portion, 32: Annular shape recess.

Claims (1)

[Claims] 1. A plurality of Vs extending in the circumferential direction on the cylindrical outer peripheral surface
The grooves are provided in multiple stages in the axial direction, and an annular convex separation band portion is formed along the circumferential direction at an intermediate position in the axial direction to divide the plurality of V grooves into a plurality of groups, thereby creating the desired multi-groove structure. A method for manufacturing a V-pulley includes forming a metal plate material into a substantially cylindrical shape with a bottom, forming flanges at both ends of the peripheral wall to obtain a preform, and then rotating the preform while performing the steps described above. A rolling roller that forms the plurality of V grooves and an annular convex separation band portion by plastic flow is pressed onto the peripheral wall portion between the flange portions, and the separation band portion of the rolling roller is formed. An annular convex portion extending in the circumferential direction is formed on the bottom surface of the annular recess that is the part, and the forming action of the rolling roller bulges the separation band portion and forms an annular convex portion on the top portion. A method for manufacturing a multi-groove V pulley with a separation band, characterized in that a recessed portion is formed. 2. A portion of the outer circumferential surface of the peripheral wall of the preformed product that is to become the separation band is formed in advance as a built-up portion, and the separation band forming portion of the forming roller is pressed against the built-up portion. A manufacturing method according to claim 1.