JPH0813394B2 - Method for manufacturing sheet metal poly V groove pulley - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a sheet metal poly V groove pulley.

[0002]

2. Description of the Related Art A sheet metal poly-V grooved pulley of this type is often used by being interposed in a rotation transmission path between an engine and a load. In this poly V-groove pulley, V-grooves are annularly formed at a plurality of positions in the axial direction on the cylindrical body wall, and one end and the other end in the axial direction of the body wall are axially outwardly extended. A brim-shaped ear portion whose diameter is expanded toward the outside is provided.

Poly V-groove pulleys of the type described above are, for example,
It can be manufactured using a sheet metal material obtained by subjecting a steel plate or the like to necessary processing such as drawing processing or slitting processing on the end surface.

A conventional method of manufacturing a sheet metal poly-V groove pulley will be described with reference to FIGS. FIG. 5 is a partial view of the sheet metal material. In the sheet metal material 1, a cylindrical body wall 3 is integrally provided on the outer periphery of a disc-shaped substrate portion 2, and the body wall 3 is formed in an axial direction. Collar-shaped rough ears 4, 4 are provided at both ends. Further, the surface of the substrate portion 2 and the inner peripheral surface of the body wall 3 are connected via the curved surfaces 5 and 5. The sheet metal material 1 of FIG. 5 is held by a rotary die, and in that state, a poly V groove is formed on the outer peripheral surface of the body wall 3, and
The rough ears 4, 4 are finished into ears 7, 7 having a predetermined shape.

The molding of the poly V groove and the ears 7, 7 are shown in FIGS.
The steps of forming and are shown in two stages. In this step, the groove forming roller 300 is used. The groove forming roller 300 includes a plurality of crest forming surfaces 301 for forming a poly V groove and a trough forming surface 302 between the crest forming surfaces 301.
And ear molding surfaces 303, 303. Further, in the lower rotary mold 100 and the upper rotary mold 200 used in this process, the molding surfaces 101 and 2 that support the inner peripheral surface of the body portion 3 of the material 1.
01 and ear molding surfaces 102 and 202 are provided. Then, in this step, the groove-making roller 300 is pressed against the outer peripheral surface of the body wall 3 of the material 1, and the material 1 and the groove-forming roller 300 are rotated and the outer surface of the body wall 3 of the material 1 is rotated. In parallel with gradually increasing the depth of the poly V groove 6 by molding the poly V groove 6, the rough ears 4, 4 are gradually finished into a predetermined shape to form the ears 7, 7. . 6 and 7, arrow A indicates the groove forming roller 5
The pressing direction of 10 is shown.

[0006]

However, in the sheet metal poly-V groove pulley adopting the above-described conventional manufacturing method, as shown in FIG. 8, the individual groove ridges having the poly-V groove 6 are formed. Wrinkles 6 probably due to the inclusion of meat on the top of 61
2 was found, and as shown in FIG. 9, it was found that there was a lacking portion 63 at the top of the groove crest 61.

Further, the groove-making roller 300 used in the conventional manufacturing method has a problem that its service life is extremely short.

Therefore, the inventor of the present application conducted an intensive investigation to find out the causes thereof, and found that the following phenomenon occurred in the step of molding the poly V groove 6 and the ear portion 7.

That is, according to the conventional manufacturing method, as shown in FIG. 6 and FIG. 7, in the forming process of the poly V groove 6 and the ear portion 7, from the initial stage to the final stage, the body of the sheet metal material 1 is always made. Molding surfaces 101, 201 of the lower rotary mold 100 and the upper rotary mold 200 corresponding to the inner peripheral surfaces 31, 31 of the wall 3
Are in contact with the inner peripheral surfaces 31, 31, the meat of the body wall 3 is pushed by the mountain forming surface 301 of the groove forming roller 300 into the body wall 3 as shown by the arrow. In addition, the reference line A- which is set at the position in contact with the outer peripheral surface of the sheet metal material 1
Flowing toward both sides of the crest forming surface 301 over A, such that the flow of meat is such that the trough forming surface 302
8, the groove crests 61 are formed in a bulge shape as shown by an arrow in FIG. 8, and in some cases, the meat may not reach the bottom of the valley forming surface 302. I found out that.

Then, the inventor of the present application found that the wrinkles 62 on the top of the groove crest 61 as shown in FIG. 8 have the meat flowing toward both sides of the crest forming surface 301 beyond the reference line A--A. It is presumed that this is caused by being caught in the bottom of the valley forming surface 302, and the thinned portion 63 at the top of the groove crest 61 as shown in FIG. It was speculated that it was caused by the fact that the meat did not reach to. Furthermore, it is assumed that the extremely short service life of the groove forming roller 300 is due to an excessive load applied to the groove forming roller 300 when the poly V groove 6 and the ears 7 are formed. . 6 and 7, a1-a1 are the lower rotary mold 100 and the upper rotary mold 20.
It is a line showing the positions of the molding surfaces 101 and 201 of 0.

The present invention has been made under the above circumstances. That is, according to the present invention, the poly V groove is formed by causing almost no bulge on the outer peripheral surface of the body wall made of a sheet metal material and only by making the mountain forming surface of the groove forming roller bite into the body wall of the sheet metal material. By taking such a measure that can be taken, there is no occurrence of wrinkles which are considered to be caused by the inclusion of meat at the top of the groove crests, or the lack of wall portion 63 at the top of the groove crests. An object of the present invention is to provide a method for manufacturing a sheet metal V-groove pulley that can prolong the service life of the groove forming roller.

[0012]

According to a first aspect of the present invention, there is provided a method for manufacturing a sheet metal poly-V grooved pulley, wherein a sheet metal material having flange-shaped rough ears on both axial ends of a cylindrical body wall. Pressing the groove forming roller against the outer peripheral surface of the body wall while holding the rotating mold, and forming a poly-V groove on the outer peripheral surface of the body wall of the material while rotating the material and the groove forming roller. A method of manufacturing a sheet metal poly-V grooved pulley including :
Axial overall length of the molding surface and the inner peripheral surface of the body wall facing it
By performing a step of forming the poly-V groove with a gap formed between the portion and the portion , the gap is filled with the body wall whose diameter is reduced as the above-mentioned step progresses.

[0013]

According to the method of the invention described in claim 1, the rotary type
Shaped surface and the entire axial length of the inner peripheral surface of the body wall facing it
The gap formed between the groove and the portion serves as an escape area for the meat when the groove for forming a groove is formed on the outer peripheral surface of the body wall of the sheet metal material to form the poly V groove. That is, when the groove forming roller bites into the outer peripheral surface of the body wall made of sheet metal, the meat flows toward the above-mentioned gap, and the depth of the poly V groove increases as the meat flows. Therefore, the outer peripheral surface of the body wall hardly rises. To put it in an extreme way, the crests of the manufactured sheet metal poly-V grooved pulleys are formed by leaving the outer peripheral surface of the body wall as it is. And above
Even if the gap is filled with meat, it will be formed by the meat
Since the body wall that always has springback characteristics,
Easily pull the shaped poly V-groove pulley out of the rotary mold
Can be released. Further, since the sheet metal material disperses the load by reducing the diameter of the body wall by itself, the load applied to the groove forming roller is reduced.

[0014]

EXAMPLE FIG. 1 is a partial view of a sheet metal material.
In this sheet metal material 1, a cylindrical body wall 3 is integrally provided on the outer periphery of a disk-shaped substrate portion 2, and flanged rough ears 4 and 4 are provided at both axial ends of the body wall 3, respectively. ing. Further, the surface of the substrate portion 2 and the inner peripheral surface of the body wall 3 are connected via the curved surfaces 5 and 5. Here, a line in contact with the outer peripheral surface of the body wall 3 is illustratively shown as a reference line AA.

The sheet metal material 1 is held by a rotary mold, and in that state, a poly V groove is formed on the outer peripheral surface of the body wall 3, and the rough ears 4, 4 are ears 7, each having a predetermined shape. Finished to 7.

2 and 3, the molding of the poly V groove 6 and the ears 7,
7 is shown divided into two steps, FIG. 2 shows the step of the previous step , and FIG. 3 shows the step of the next step .

The groove forming roller 300 'used in the previous step shown in FIG. 2 has a plurality of crest forming surfaces 301', a valley forming surface 302 ', and ear forming surfaces 303' and 303 '. ing. Further, the lower rotary type 10 used at this stage
0 ′ and the upper rotary die 200 ′ are provided with molding surfaces 101 ′ and 201 ′ and ear molding surfaces 102 ′ and 202 ′ corresponding to the inner peripheral surface 31 of the body 3 of the raw material 1. Then, at this stage, the inner peripheral surface 3 of the body wall 3 shown in phantom in FIG.
In the state where a predetermined gap C1 is formed between the axially entire length portion of 1 , 31 and the molding surfaces 101 ′, 201 ′ of the lower rotary mold 100 ′ and the upper rotary mold 200 ′, the substrate portion 2 of the material 1 is formed. Is held by the lower rotary mold 100 'and the upper rotary mold 200' to hold the material 1, and in this state, the groove forming roller 300 'is pressed against the outer peripheral surface of the body wall 3 to form the material 1 and the groove. While forming the poly V groove 6 on the outer peripheral surface of the body wall 3 of the material 1 while rotating the roller 300 ′ for use, and gradually deepening the poly V groove 6, the gap C 1 is formed as the process progresses. It is filled with the body wall 3 whose diameter is reduced. In parallel with this, the rough ears 4, 4 are gradually finished into a predetermined shape and brought close to the shape of the ears 7, 7 (FIG. 3).

In this way, the above-mentioned gap C1 becomes poly V
It serves as an escape area for the meat when the groove 6 is formed, and when the mountain forming surface 301 ′ of the groove forming roller 300 ′ bites into the body wall 3, the meat flows toward the gap, and such meat is formed. Since the depth of the poly-V groove becomes deeper with the flow of, the outer peripheral surface of the body wall 3 hardly rises. That is, the flesh of the body wall 3 does not bulge beyond the reference line AA, and even if it bulges, it is very small. So
Even if the gap C1 is filled with meat,
The body wall 3 that is formed is always springback characteristic
Since the molded poly V groove pulley has
00 'and upper rotary mold 200' can be easily pulled out and released.
Can be In addition, the material 1 is of the upper and lower rotary types from the line a1-a1 indicating the position of the inner peripheral surface 31, 31 of the body wall 3 itself when the material 1 is held by the upper and lower rotary types. Since the load is dispersed by reducing the diameter to the position of the line a2-a2 indicating the position of the molding surface, the groove forming roller 3
The load applied to 00 'is small, and the load does not significantly shorten the useful life of the groove forming roller 300'.

After the poly V groove 6 and the rough ears 4, 4 are preformed in this manner, the material 1 is held by another lower rotary mold 100 "and an upper rotary mold 200". The lower rotary mold 100 ″ and the upper rotary mold 200 ″ used here are different in diameter of the molding surfaces 101 ″ and 201 ″ from the lower rotary mold 100 ′ and the upper rotary mold 200 ′ used at the stage described in FIG. Is a little small. Then, the inner peripheral surfaces 31, 31 of the body wall 3 and the lower rotary mold 100 ″ and the upper rotary mold 2 shown in phantom in FIG.
00 "each molding surface 101 for", "in a state of forming a predetermined clearance C2 between the substrate 2 of the blank 1 bottom rotary 100" 201 the material is sandwiched by the upper rotary 200 "and 1 is held, and in that state, the groove forming roller 300 ″ is pressed against the outer peripheral surface of the body wall 3, and the outer peripheral surface of the body wall 3 of the material 1 is rotated while rotating the material 1 and the groove forming roller 300 ″. A poly V groove 6 is formed in the poly V groove 6 and the poly V groove 6 is gradually deepened to fill the gap C2 with the body wall 3 whose diameter is reduced as the process progresses. ,
The rough ears 4, 4 are molded to finish the ears 7, 7.

Even at this stage, the gap C2 has a poly V
Since it serves as an escape area for meat when forming the groove 6, the reference line A
The flesh of the body wall 3 rarely bulges beyond -A, and even if it bulges only slightly. this
Also in the case, as described above, the gap C2 is filled with meat.
The body wall 3 formed by stacking has a springback characteristic.
Since it has a molded poly V groove pulley, the lower rotary mold 10
Easily pull out from 0 "or upper rotary mold 200" and release
be able to. In addition, the material 1 has its inner peripheral surfaces 31 and 31 of the body wall 3 self-rotating above and below the line a2-a2 showing the position of the inner peripheral surface when the material 1 is held by the upper and lower rotating molds. Since the load is dispersed by reducing the diameter to the position of the line a3-a3 indicating the position of the molding surface, the groove forming roller 30
The load applied to 0 "is small, and the load is applied to the groove forming roller 3
The situation where the service life of "00" is significantly shortened does not occur.

By the way, in this embodiment, the upper and lower rotary molds 100 ", 20 used at the final stage described in FIG.
The radius of curvature of the curved molding surface 103 ″ provided at 0 ″ is the same as that of the upper and lower rotary molds 10 used at the stage described in FIG.
The radius of curvature is larger than the radius of curvature of the curved molding surface 103 'provided in 0', 200 '. In addition, the radius of curvature of the curved molding surface 103 ′ provided on the upper and lower rotary molds 100 ′ and 200 ′ used at the stage described with reference to FIG.
Is larger than the radius of curvature of the curved surface 5. Therefore, the curved surface 5 of the material 1 shown in FIG. 1 has a slightly larger radius of curvature due to the process described with reference to FIG. 2, and the material obtained by the process described with reference to FIG. The curved surface 5 of No. 1 has a larger radius of curvature by going through the final stage described in FIG. As described above, when the radius of curvature of the curved surface 5 is gradually increased as the molding of the poly-V groove 6 progresses, the meat can smoothly flow into the gaps C1 and C2. Groove roller 30
The load on 0 ', 300 "is further reduced.

FIG. 4 shows the contour line of the inner peripheral surface 31 of the material 1, the contour line of the poly V groove 6, the contour line of the rough ears 4 or 7 and the contour line of the curved surface 5 at each stage described above. It is a figure in which the behavior of the poly V groove 6 at the time of molding can be easily understood by superimposing and displaying the above. In the figure, the two-dot chain line a represents the material 1 at the stage shown in FIG.
The thin solid line b represents the material 1 at the stage shown in FIG. 2, and the thick solid line c
3 shows a poly V groove pulley that has undergone the final stage of FIG.

[0023]

As described above, according to the method of the present invention as set forth in claim 1, it is possible to form the poly-V groove on the body wall of the sheet metal material without causing an excessive bulge due to the flow of meat. Therefore, it becomes possible to easily manufacture a sheet metal poly-V grooved pulley having no wrinkles or lacking portions at the top of the groove mountain portion. Further, when the poly V groove is formed, the meat flows and escapes into the gap between the rotary die and the axially entire length portion of the inner peripheral surface of the body wall of the sheet metal material, so that the groove is formed on the outer peripheral surface of the body wall. For low
Press the blade and do not rotate the above material and the groove-making roller.
When forming a poly V groove on the outer peripheral surface of the body wall of the above materials
The V-grooves that form the poly-V-groove have a uniform shape.
In addition to the excellent effect of being formed, the load applied to the groove forming roller is reduced, and the service life of the groove forming roller is improved accordingly . further,
Even if the above gap is filled with meat, it will be formed by that meat.
Make sure that the body wall is spring-backed
Easily pull the molded poly V groove pulley from the rotary mold
There is also an effect that it can be removed and released.

[Brief description of drawings]

FIG. 1 is an explanatory view partially showing a specific shape of a sheet metal material used in a method for producing a sheet metal poly V groove pulley according to the present invention.

FIG. 2 is an explanatory diagram of an intermediate stage in the method for manufacturing a sheet metal poly V groove pulley according to the present invention.

FIG. 3 is an explanatory view of the final stage in the method for manufacturing a sheet metal poly V groove pulley according to the present invention.

FIG. 4 is an explanatory diagram showing the behavior of each contour line in the method for manufacturing a sheet metal poly V groove pulley according to the present invention.

FIG. 5 is an explanatory view partially showing a specific shape of a sheet metal material used in a conventional method.

FIG. 6 is an explanatory diagram of an intermediate stage in the conventional method.

FIG. 7 is an explanatory diagram of a final stage in the conventional method.

8 is an explanatory diagram showing a defect occurring in <br/> Mizoyama portion of the manufactured sheet-metal poly V-groove pulley with a conventional method.

FIG. 9 is an explanatory diagram showing another defect that has occurred in the groove peak portion of the sheet metal poly V groove pulley manufactured by the conventional method.

[Explanation of symbols]

 1 Sheet Metal Material 3 Body Wall 4 Rough Ear 5 Curved Surface 6 Poly V Groove 31 Inner Surface of Body Wall 100 ', 100 "Lower Rotating Type 101', 101" Forming Surface 103 ', 103 "Curved Forming Surface 200' , 200 "Upper rotation type 201 ', 201" Forming surface 300', 300 "Grooving roller C1, C2 Gap

Claims (1)

[Claims] The method according to claim 1] Zomizo roller a cylindrical sheet-metal-containing material with a collar-shaped coarse ears both axial end portions of the body wall of the outer peripheral surface of the cylinder wall while being held on the rotary A method for manufacturing a sheet metal poly-V groove pulley, which includes a step of pressing and rotating the material and a groove-making roller to form a poly-V groove on the outer peripheral surface of the body wall of the material, the method comprising: The shaft of the inner peripheral surface of the body wall facing it
A metal plate characterized by performing a step of forming a poly-V groove in a state where a gap is formed between it and a full-length portion in the direction, and filling the gap with the body wall whose diameter is reduced as the step proceeds. Manufacturing method of poly V groove pulley.