JPH0242573B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a method for manufacturing a multi-groove V-pulley of different diameters by rolling a bottomed cylindrical preform obtained from a predetermined metal plate material, and particularly A different structure in which the diameter of at least one set of V-pulley parts adjacent in the axial direction with a separation band in between is larger on the bottom side of the bottomed cylindrical part of the preform than on the opening side. The present invention relates to a method of manufacturing a multi-diameter V-pulley.

(Prior Art) A multi-groove V-pulley generally includes a plurality of V-pulley parts each having a plurality of V-grooves spaced apart in the axial direction on a cylinder wall of a pulley material having a substantially bottomed cylindrical shape. It has a structure including a separation band that is located at the boundary between the sections and protrudes radially outward in an annular shape. Then, V-belts having V ridges corresponding to the respective V-grooves are wound around each V-pulley section separated by such a separation band, and these V-belts are used. It is designed to transmit rotational force to multiple drive systems via.

By the way, such multi-groove V pulleys usually have
Although it is manufactured by cutting the cylindrical wall of a pulley material having a cylindrical shape with a bottom, this cutting method has problems such as poor material yield and poor productivity.

Therefore, in recent years, as a manufacturing method for such multi-groove V pulleys, a preform of a cylindrical shape with a bottom is formed by deep drawing a predetermined metal plate material, for example, a rolled steel plate, and an integrated part member is installed inside this preform. In the inserted state, a bending roller, a thickening roller, and a grooving roller are sequentially pressed against the cylindrical wall of the preform, as described above.
The desired multi-groove V-pulley is obtained by molding a grooved product as a multi-groove V-pulley having a plurality of V-pulley parts and separation bands, and extracting the grooved product from the V-pulley part. , a so-called rolling process method has been proposed. If such a rolling method is used, the material yield and productivity can be significantly improved compared to when a cutting method is used.

(Problem) However, all of the conventionally proposed rolling processing methods are intended to manufacture V-pulleys with the same diameter and multiple grooves in which each V-pulley part has the same diameter. Since a one-piece structure is adopted as a part member to be inserted into the V-pulley, it can be suitably applied to the production of such V-pulleys with multiple grooves of the same diameter. The diameter of the V-pulleys, particularly at least one pair of V-pulley parts adjacent in the axial direction with a separation zone in between, is larger on the bottom side of the bottomed cylindrical part of the preform than on the opening side. There was a problem that the method could not be applied to the production of V-pulleys with different diameters and multiple grooves.

That is, when manufacturing a multi-groove V-pulley by the rolling method as described above, the part member inserted into the preform has an outer circumferential surface shape corresponding to the shape of the intended multi-groove V-pulley. It is necessary to use a patch member having Therefore, when manufacturing a V-pulley with multiple grooves of the same diameter, a part member having a cylindrical outer circumferential surface is used, so the grooved product can be easily extracted from the part member to produce the desired multi-groove part. A grooved V-pulley can be obtained, but as described above, the diameters of at least one pair of V-pulley parts adjacent in the axial direction with the separation zone in between are those on the bottom side of the bottomed cylindrical part of the preform. When manufacturing a multi-groove pulley with different diameters that has a larger diameter than the one on the opening side, as the part member, the diameter of at least one set of adjacent cylindrical surfaces with a stepped part in between is used. However, since it is necessary to use a structure with a stepped cylindrical outer peripheral surface that has a larger diameter on the distal end than on the proximal end, it is necessary to use Although it is possible to mold a grooved product with a corresponding shape, the stepped part of the part member becomes an undercut shape with respect to the direction in which the grooved part is pulled out, making it impossible to pull out such a grooved part from the part member. Therefore, the conventionally proposed rolling method could not be applied as is to the manufacture of the V-pulley with multiple grooves of different diameters having the above structure.

(Solution Means) Against this background, the present invention provides that the diameters of at least one pair of V pulley portions adjacent in the axial direction across the separation band are equal to the diameter of the bottomed portion of the preform, as described above. A multi-groove V-pulley with different diameters has a structure in which the bottom side of the cylindrical part has a larger diameter than the one on the opening side (hereinafter, a multi-groove V-pulley with such a structure is simply referred to as a multi-groove V-pulley with different diameters). This was done to provide a method for manufacturing a preform in the shape of a cylinder with a bottom obtained from a predetermined metal sheet material by rolling processing, and its gist is (a) A part member with a removable diameter increasing member attached to the outer peripheral surface of the part body is used so that the outer peripheral surface has a stepped cylindrical shape that corresponds to the shape of the target multi-groove V-pulley of different diameters, and the part member is attached within the preform. With the patch member inserted, by pressing a plurality of bending rollers against the cylindrical shape of the preform and recessing the contact portion of the bending rollers,
The cylindrical wall is radially uneven and bent such that a portion of the outer circumferential surface of the pad member corresponding to the stepped portion and corresponding to the part where the separation band is formed protrudes radially outward in an annular shape. (b) having a stepped cylindrical outer circumferential surface having a shape that complements the outer circumferential surface of the pad member and including a stepped portion of the stepped cylindrical portion; By pressing a thickening roller having an annular groove in a portion corresponding to the convex portion of the cylindrical wall of the bent product against the cylindrical wall of the bent product, the thickness of the cylindrical wall of the bent product is increased. ,
A stepped cylindrical cylindrical wall corresponding to the outer circumferential surface of the pad member, which has an annular convex portion protruding radially outward in a portion including the stepped portion and corresponding to the part where the separation band is formed. (c) forming an annular separation zone forming groove in a portion corresponding to the convex part of the thickened product, including the stepped part; A cylindrical wall of the thickened product, wherein a plurality of annular V-groove-forming ribs are formed on surfaces corresponding to the respective cylindrical surfaces of the thickened product separated by a cylindrical portion, separated in the axial direction. A grooving roller having a stepped cylindrical outer peripheral surface with a shape that complements the stepped cylindrical shape of is pressed against the cylindrical wall of the thickened product to correspond to the convex portion of the cylindrical wall of the thickened product. The annular separation zone protrudes radially outward in the section, and the cylindrical portions of the cylindrical wall of the thickened product are separated in the axial direction from each other by the convex portion. a grooving step of forming a plurality of annular V grooves to form a plurality of V pulley parts including at least the one set of V pulley parts; (d) a grooving product formed in the grooving step; and a step of pulling out each diameter-increasing member of the pad member from the pad body.

(Function/Effect) If the multi-groove V-pulley of different diameters is manufactured according to this method, it is possible to easily mold a grooved product corresponding to the shape of the desired multi-groove V-pulley of different diameters. Furthermore, the main part of the part member can be easily extracted from the grooved product to obtain a V-pulley with multiple grooves of different diameters having the desired shape. Therefore, the multi-groove V-pulley of different diameters having the above-mentioned structure can be manufactured with good material yield and productivity by the rolling process.

(Examples) Hereinafter, in order to clarify the present invention more specifically, examples thereof will be described in detail based on the drawings.

First, FIG. 1 shows a cross-sectional view of a multi-groove V-pulley of different diameters 10 manufactured according to the method of this embodiment. As is clear from the figure, the multi-groove V-pulley of different diameters 10 manufactured according to the method of this embodiment has an approximately bottomed cylindrical shape as a whole, and both ends of the outer circumference of the cylinder wall in the axial direction It has annular flange parts 14 and 16 facing outward, respectively, and a plurality of annular flange parts 14 and 16 located between the flange parts 14 and 16 and spaced apart in the axial direction (here, 6 and 5 threads, respectively). ) has a pair of V-pulley parts 22, 24 with V-grooves 20. Also, those V
A separation band 18 is located at the boundary between the pulley parts 22 and 24 and is a relatively high annular protrusion.
Here, V on the bottom wall side of the bottomed cylindrical portion
The pulley portion 22 is configured to have a diameter larger than the diameter of the V pulley portion 24 on the opening side, and the V grooves of the V pulley portions 22 and 24 are wound around the V pulley portions 22 and 24, respectively. The two drive systems can be rotationally driven through V-belts 28 and 30 provided with V-shaped protrusions corresponding to 20.

In addition, in FIG. 1, 32 is a grooved product formed by rolling a preform 34, which will be described later, and has a stepped bottomed cylindrical shape. Further, in the figure, numeral 36 denotes a diameter-increasing sleeve as a diameter-increasing member constituting a part of a pad member 38, which will be described later, and has a cylindrical shape. As is clear from FIG. 1, in the V pulley 10 with different grooves manufactured according to the method of this embodiment, the diameter increasing sleeve 36 is attached to the inner periphery of the V pulley portion 22 on the bottom side of the grooved product 32. It has a structure that is integrally held on the surface.

Next, the different diameter multi-groove V pulley 10 with such a structure
The manufacturing method will be explained with reference to FIGS. 2 to 6.

That is, the different diameter multi-groove V pulley 10 shown in FIG.
When manufacturing a V-pulley with multiple grooves of the same diameter, first, a metal plate material such as a rolled steel plate punched into a circular shape is deep-drawn, in the same way as when manufacturing a V-pulley with multiple grooves of the same diameter using a rolling process. As shown in FIG. 2, a substantially cylindrical preform 34 with a bottom is formed. And such a preform 34
As shown in FIG. 2, it is set in a rolling processing apparatus consisting of a lower mold 40, an upper mold 42 and a pad member 38.

More specifically, the preform 34 is placed on the upper surface of the lower mold 40 at its bottom wall so that its inner space opens upward. Then, the bottom wall portion is held between the tip end surface (lower end surface) of the pad member 38 inserted into the inner space of the preform 34 and the upper surface of the lower mold 40, and the open end thereof is held in the upper mold. 42, and is set in the rolling device. In this embodiment, as a part member 38 inserted into the preform 34, the diameter increasing sleeve 36 is removably attached to the tip of the outer peripheral surface of a part main body 44 having a cylindrical outer peripheral surface. By this, the outer peripheral surface has a stepped cylindrical shape corresponding to the shape of the target different diameter multi-groove V pulley 10, more precisely, a stepped cylindrical shape corresponding to the stepped cylindrical shape of the cylinder wall of the grooved product 32. A structure having a cylindrical shape is used.

Note that the lower mold 40 and the upper mold 42 are provided with annular flange forming grooves 46 and 48 on their upper and lower surfaces, respectively, similar to those used in the conventional rolling process method for multi-groove V pulleys of the same diameter. The new one will be used. Further, the preform 34 is provided with the different diameter multi-groove V pulley 1 in a state surrounding the bottom wall portion thereof in an annular shape during deep drawing.
A preliminary bent portion 50 for forming the annular flange portion 14 at 0 is formed.

When the preform 34 is set in the rolling machine in this manner, the preform 34 is then rotated about its center line and both ends of its cylindrical wall are rotated as shown in FIG. Bending rollers 52 and 54 are pressed at predetermined positions nearby. At the same time, the upper mold 42 and the lower mold 40
are brought close to each other, and a pressing force is applied to both ends of the cylindrical wall of the preform 34. As a result, the contact portions of the bending rollers 52 and 54 are recessed radially inward in an annular shape, and the portion between the contact portions of the bending rollers 52 and 54 is recessed radially outward in an annular shape. A bent article 58 having a protruding convex portion 56 is formed.

Note that the annular convex portion 56 formed on the bent product 58 is located at a portion corresponding to the stepped surface 60 on the outer circumferential surface of the pad member 38 based on the adjustment of the tip angle of the bending rollers 52 and 54, that is, the purpose It is formed at a location corresponding to the formation location of the separation band 18 of the multi-groove V-pulley 10 with different diameters. Furthermore, as shown in FIG. 3, the bent product 58 obtained in this bending process has the following characteristics based on the presence of the flange forming grooves 46 and 48 of the lower mold 40 and the upper mold 42, respectively. Annular flange portions 14 and 16 having substantially the same shape as those of the multi-groove V pulley 10 of different diameters are formed.

When the bent product 58 is obtained through such a bending process, as shown in FIGS. 4 and 5, the bent product 58 is then bent in the axial direction of its cylindrical wall. The thickening roller 62 is rotated and pressed while the displacement of the roller 62 is restricted. As a result, the uneven curved surface of the cylindrical wall portion of the bent product 58 is evened out, and the cylindrical wall portion is formed into a stepped cylindrical shape corresponding to the stepped cylindrical shape of the outer peripheral surface of the pad member 38. At the same time, the cylindrical wall portion is made thicker. In addition, due to this thickening,
The stepped part of the cylindrical wall portion corresponds to the convex part 56 of the bent product 58, that is, the part corresponding to the part where the separation band 18 of the target multi-groove V-pulley 10 of different diameters is formed. A convex portion 64 is formed.

That is, the thickening roller 62 has a stepped cylindrical outer circumferential surface having a shape that complements the stepped cylindrical shape of the outer circumferential surface of the pad member 38, and the outer circumferential surface has a stepped cylindrical shape. An annular groove 66 extending in the circumferential direction is formed at the stepped portion.
Here, since the bent product 58 is pressurized and thickened between the thickening roller 62 and the pad member 38, the thickness of the cylindrical wall portion is increased, and at the same time, the cylindrical wall is thickened. The portion is formed into a stepped cylindrical shape corresponding to the stepped cylindrical shape of the outer peripheral surface of the pad member 38, and based on the presence of the groove 66 of the thickening roller 62, the annular convex portion 64 is formed.

It should be noted that on the inner peripheral surface of the thickened product 68 formed in this way, there is a gap in the axial direction between the stepped surface 70 formed on the inner peripheral surface of the cylindrical wall and the bottom wall. In the pinched state, the diameter increasing sleeve 36 forming a part of the pad member 38 is held integrally. In addition, as mentioned above, the bent product 5
Since the convex portion 64 is formed at a portion corresponding to the convex portion 56 of No. 8, as shown in FIG. An overlapping portion 72 is formed in a state continuous with the stepped surface 70. Furthermore, the annular flanges 14 and 16 at both axial ends of the cylinder wall of the thickened product 68 are each formed into a substantially final shape at this stage.

Thickened product 68 by the above-mentioned thickening molding operation
Once obtained, the thickened product 68 is then cut with a groove roller 7 as shown in FIG.
4 is rotated and pressed.

This grooving roller 74 is similar to the thickness increasing roller 62.
Similarly, it has a stepped cylindrical outer circumferential surface having a shape that complements the stepped cylindrical shape of the outer circumferential surface of the pad member 38, and is located at the stepped portion corresponding to the convex portion 64 of the thickened product 68. Therefore, the target different diameter multi-groove V pulley 10
The separation band forming groove 76 has an annular cross section corresponding to the cross-sectional state of the separation band 18. Further, on each cylindrical surface of the grooving roller 74, annular V-groove forming ribs 78 of a number corresponding to the number of 20 V-grooves formed in the target multi-groove V-pulley of different diameters are formed in the axial direction. are formed separately.

In this embodiment, the groove cutting roller 74 having such a structure is rotated and pressed against the thickened product 68 as described above, thereby forming grooves in the convex portion 64 of the thickened product 68. Cutting roller 7
The separation band 18 having a cross section corresponding to the cross-sectional shape of the separation band forming groove 76 of No. 4 is carved and formed, and the V-groove forming rib of the corresponding groove cutting roller 74 is formed on each cylindrical surface of the thickened product 68. The V-grooves 20 corresponding to the number of 78 are carved and formed, and the V-pulley parts 22, 2
4 are formed respectively. In other words, this:
Grooved product 32 of the target multi-groove V-pulley 10 with different diameters
is formed.

By the way, when such a grooved product 32 is obtained, the upper mold 42 and the lower mold 40 are vertically separated,
The grooved product 32 will be removed from the rolling machine, but in this embodiment, as described above,
The diameter-increasing sleeve 36 that constitutes the patch member 38 together with the patch body 44 is
Since it is installed in a removable state, the grooved product 32 can be easily pulled out from the part body 44 along with its diameter increasing sleeve 36. That is, as a result, the grooved product 32 and the increased diameter sleeve 3
6, the different diameter multi-groove V pulley 1 shown in FIG.
0 is obtained.

In this way, according to the method of this embodiment, the separation zone 1
V pulley portions 22 adjacent in the axial direction with 8 in between,
The different diameter multi-groove V pulley 10 has a structure in which the diameter of the V pulley part 22 on the bottom side of the preform 34 is larger than the diameter of the V pulley part 24 on the opening side.
can be manufactured by rolling a preform 34 obtained from a metal plate material, similar to conventional multi-groove V-pulleys of the same shape.Therefore, by cutting a bottomed cylindrical pulley material Compared to the case where a V-pulley with different diameters and multiple grooves having a similar structure is manufactured by processing, the material yield can be greatly improved, and the productivity can be greatly improved.

In addition, in this embodiment, the positioning of the increasing diameter sleeve 36 with respect to the preform 34 and the positioning with respect to the grooved product 32 are performed using the increasing diameter sleeve 36.
As shown in FIG.
At the same time, a stepped surface 82 facing toward the distal end of the putt body 44 is formed, and the stepped surface 82 of the putt body 44 and the bottom wall of the preform 34 (here, the grooved product 32 is shown) are formed. It is also possible to position the diameter increasing sleeve 36 with respect to the preform 34 by sandwiching the inward flange portion 80 of the diameter increasing sleeve 36 between the parts. It is also possible to position the diameter-increasing sleeve 36 with respect to the preform 34 by sandwiching both ends of the diameter-increasing sleeve 36 in the axial direction between the stepped surface 82 and the bottom wall of the preform 34. be.

In addition, in this embodiment, the target multi-groove V-pulley 10 of different diameters is formed by forming a grooved product 32 by rolling a preform 34, and an enlarged part forming part of a part member 38. Although the V-pulley 10 has multiple grooves of different diameters, it is also possible to configure the V-pulley 10 with only the grooved product 32. In this case, as shown in FIG. 9, the diameter-increasing sleeve 36 has a divided structure consisting of a plurality of dividing members 84 that can be divided in the circumferential direction, and the grooved product 32 is separated from the part body 44 by diameter-increasing sleeve 36. After extracting the entire sleeve 36, the diameter-increasing sleeve 36 can be divided and removed from the grooved product 32. However, in this case, in order to facilitate the removal operation of the increasing diameter sleeve 36 from the grooved product 32, the stepped surface 60 of the pad member 38 is provided as shown in FIGS. 8 and 9. It is desirable that the surface of the diameter-increasing sleeve 36 corresponding to the stepped surface 60 be formed as an inclined surface 86 so as to form a tapered surface that opens toward the distal end.

Furthermore, in the above description, the annular flange portion 1
Although it has been described that the different diameter multi-groove V pulley 10 having a structure including only a pair of V pulley parts 22 and 24 separated by a separation band 18 between V pulley parts 4 and 16 is manufactured, the present invention A set of V pulley parts 2 like this
The present invention is not limited to manufacturing a multi-groove V-pulley of different diameters having a structure including only V-pulley parts 2, 24, but includes three or more V-pulley parts including a pair of V-pulley parts 22, 24 as described above. Manufacture of multi-groove V pulleys with different diameters,
In other words, the diameter of at least one pair of V-pulley parts adjacent in the axial direction with the separation zone in between is made larger on the bottom side of the bottomed cylindrical part of the preform than on the opening side. The present invention can also be suitably applied to the manufacture of a multi-groove V-pulley of different diameters having a structure having three or more V-pulley parts.

In this case, a separation band 18 will be formed at each boundary of each V-pulley part, but the separation band 18 and the V-groove 20 in each V-pulley part will be formed between adjacent V-pulley parts. Regardless of whether the portions have the same diameter or different diameters, they are basically formed according to the same method as the method of the above embodiment.

Although the embodiments of the present invention have been described in detail above, these are merely illustrative examples, and the present invention is not limited to these specific examples. It goes without saying that the invention can be implemented with various changes, modifications, improvements, etc. based on knowledge.

[Brief explanation of drawings]

FIG. 1 is a half-cut sectional view showing an example of a multi-groove V-pulley of different diameters manufactured according to the method of the present invention, and FIGS. 2, 3, 4, 5, and 6 are ,
FIG. 2 is an explanatory cross-sectional view for explaining a manufacturing process for manufacturing the multi-groove V-pulley of FIG. 1 according to the method of the present invention. Figures 7 and 8 are
FIG. 9 is an explanatory sectional view corresponding to FIG. 6 for explaining another example method according to the present invention, and FIG. 9 is a plan view showing the diameter increasing sleeve taken out from FIG. 8. 10: Different diameter multi-groove V pulley, 14, 16: Annular flange portion, 18: Separation band, 20: V groove, 22, 2
4: V pulley part, 32: Grooved product, 34: Preform, 36: Diameter increasing sleeve (diameter increasing member), 3
8: Part member, 40: Lower mold, 42: Upper mold, 4
4: Pat main body, 52, 54: Bending roller, 5
6: Convex portion, 58: Bent product, 62: Thickening roller, 6
4: Convex portion, 66: Concave groove, 68: Thickened product, 74:
Grooving roller, 76: Separation band forming groove, 78: V groove forming rib, 80: Inward flange portion, 84: Dividing member, 86: Inclined surface.

Claims (1)

[Claims] 1. A preform having a bottomed cylindrical shape obtained from a predetermined metal plate material is rolled, so that the diameters of at least one set of V-pulley parts adjacent in the axial direction with a separation band in between are , a method for manufacturing a multi-groove V-pulley with different diameters, in which the bottom side of the bottomed cylindrical part of the preform has a larger diameter than the one on the opening side, the outer circumferential surface having the desired different diameter multi-groove pulley. Using a pad member with a diameter increasing member removably attached to the outer peripheral surface of the pad body so as to have a stepped cylindrical shape corresponding to the shape of the grooved V pulley, with the pad member inserted into the preform, By pressing a plurality of bending rollers against the cylindrical wall of the preform and recessing the abutting portions of the bending rollers, the separation zone is formed at a portion including a portion corresponding to the stepped portion of the outer peripheral surface of the pad member. a bending step of forming a bent product in which the cylindrical wall is bent in a concave and convex manner in the radial direction so that a portion corresponding to the pad member protrudes outward in a radial direction in an annular shape; A thickening roller having a stepped cylindrical outer circumferential surface and having an annular groove in a portion corresponding to a convex portion of the cylindrical wall of the bent product, including the stepped portion of the stepped cylindrical portion;
By pressing against the cylindrical wall of the bent product and thickening the cylindrical wall of the bent product, the part corresponding to the part where the separation zone is formed, including the stepped part, protrudes radially outward. A thickening step of molding a thickened product having a stepped cylindrical wall corresponding to the outer circumferential surface of the pad member and having an annular convex portion; An annular separation zone forming groove is formed in a portion corresponding to the shaped portion, and
A plurality of annular V-groove forming ribs are formed on surfaces corresponding to respective cylindrical surfaces of the cylindrical wall of the thickened product separated by the convex portion and spaced apart in the axial direction. A grooving roller having a stepped cylindrical outer peripheral surface with a shape that complements the stepped cylindrical shape of the cylindrical wall is pressed against the cylindrical wall of the thickened product, and is cut into the convex portion of the cylindrical wall of the thickened product. In the corresponding portions, the annular separation zone protruding outward in the radial direction is formed, and in each cylindrical portion separated by the convex portion of the cylindrical wall of the thickened product, in the axial direction A grooving step of forming a plurality of annular V-grooves spaced apart to form a plurality of V-pulley parts including at least the one set of V-pulley parts; and a grooving product formed in the grooving step, A method for manufacturing a multi-groove V-pulley of different diameters, comprising the step of pulling out each diameter-increasing member of the part member from the part body of the part member. 2. The manufacturing method according to claim 1, wherein one separation band is formed and a pair of V pulley portions are formed on both sides of the separation band in the axial direction. 3. The manufacturing method according to claim 1, wherein a plurality of separation bands are formed, and a plurality of V-pulley parts are formed sandwiching each separation band in the axial direction. 4. The diameter increasing member of the part member has an integral structure, and is integrally held within the grooved product to form a multi-groove V pulley with different diameters together with the grooved product. A manufacturing method according to any one of claims 1 to 3. 5. The diameter increasing member of the patch member has a divided structure that can be divided into a plurality of divided members in the circumferential direction, and the diameter increasing member can be removed from the grooved product after the drawing step. A manufacturing method according to any one of claims 1 to 3.