JP2547709B2 - Sheet metal pulley manufacturing method - 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 pulley, and more particularly to a method for manufacturing a sheet metal pulley in which an ear portion is annularly extended from an end of a cylindrical body wall for belting.

[0002]

2. Description of the Related Art A cup-shaped molded body having a base body and a cylindrical rough barrel wall is manufactured by subjecting a metal disc-shaped material to a pressing process, and the rough barrel wall has ears and V grooves. A method of manufacturing a sheet-metal pulley that is formed by molding into a body wall for belting has been conventionally known.

FIGS. 17 and 18 show molded products B1 and B2 obtained in an intermediate step when manufacturing a sheet metal pulley by a conventional method.
The cross-sectional shape of is shown in order.

The molded body B1 shown in FIG. 17 is manufactured by pressing a metal disc-shaped material (not shown), and the flat plate portion 5
A cylindrical coarse body wall 61 is provided on the outer periphery of a base body 5, which is composed of 1 and an inclined plate portion 52 around it. Molded body B2 of FIG.
Is manufactured by pressing the base body 5 of the molded body B1 of FIG. 17, and has a recessed portion 53 and an annular portion 54 around the recessed portion 53. In the molded body B2, a corner portion a formed by the base body 5 and the rough barrel wall 61 has a shape having an arc-shaped contour line b1 as shown in an enlarged view in the figure. The ears are the ends of the rough body wall 61 of the molded body B2 of FIG.
It is formed at one corner a.

[0005]

In the conventional manufacturing method, when the step of forming the ears on the molded body B2 of FIG. 18 is performed, the molded body B2 is rotated as shown in FIG.
0 and the rotating upper mold 100 and rotating them, the annular pointed molding surface 310 of the ear forming roller 300 corresponds to a portion corresponding to the thickness range of the base body 5 (FIG. 18).
(Indicated by reference sign P in FIG. 3) is pressed against the corner portion a of the rough barrel wall 61.

However, as described above, since the corner portion a of the rough barrel wall 61 has the arcuate contour line b1, the rough barrel wall 61 is located at the position P corresponding to the thickness range of the base body 5. When the annular pointed forming surface 310 of the ear forming roller 300 is pressed against the corner a, the pointed forming surface will inevitably come into contact with the arc-shaped contour line b1 of the corner a. As shown in FIG. 19, the pointed molding surface 310 does not sufficiently dig into the corner a, resulting in insufficient mass (insufficient wall thickness) at the ear forming portion, and as a result, the meat is sufficiently stretched at the ear forming portion. As a result, the width of the formed ear portion 7 cannot reach the proper shape as shown by the broken line 7 '. Such a phenomenon occurs even if the rough barrel wall 61 is made thicker prior to the formation of the ears.

The present invention has been made in view of the above problems.

That is, according to the present invention, an end portion (that is, a corner portion) of the molded body having a base body and a cylindrical rough barrel wall on the side of the rough barrel wall which is continuous with the base body is a roller for forming an ear portion. When the pointed molding surface is pressed and slotted, the pointed molding surface fully digs into the end of the rough body wall, and the flesh extends sufficiently outward at the ear molding point to ensure that the ear has the proper shape. An object of the present invention is to provide a method for manufacturing a sheet metal pulley that can reliably form a portion.

The present invention also provides a method of manufacturing a sheet metal pulley including means for forming an angular corner portion formed to achieve the above object from a disc-shaped material without difficulty. The purpose is to A further object of the present invention is to provide a method of manufacturing a sheet metal pulley that includes means for thickening the rough barrel wall prior to forming the ears.

[0010]

A method for manufacturing a sheet metal pulley according to a first aspect of the present invention is characterized in that a cylindrical body wall for belting is integrally provided on an outer periphery of a base body, and the body wall is continuously provided on the base body. In the method for manufacturing a sheet metal pulley having an ear portion annularly bulged at the end on the side of, the outer peripheral portion of a disc-shaped material is bent into an end-spreading shape to form an inclined wall, and then the inclined wall is angled. Corresponding to a rough corner wall formed by the press forming die having a bending forming surface having a projecting portion and formed by the above cornering portion, and a rough barrel wall inclined in an end-spreading shape on the outer peripheral side of the corner portion. And a cylinder corresponding to the rough body wall is pressed inward by a pressing roller to be bent while maintaining the angular shape of the corner portion and connected to the base body through the corner portion. -Shaped rough body wall is formed, and then the inner peripheral side of the corner Pressing the pointed molding surface of the ears molding roller against the above-mentioned corner of the rough body wall at a location corresponding to the range of the wall thickness of the body and slotting the location to bulge the ears annularly. Is. The method for manufacturing a sheet metal pulley according to claim 2 is provided in a press molding die according to the method according to claim 1, when the angular corner portion and the rough barrel wall-corresponding portion inclined in a flared shape are formed. By applying the outer peripheral end face of the material to the position regulating surface and compressing the portion of the material on the outer peripheral side of the corner portion in the creeping axial direction thereof, the corner portion is formed and the thickened rough cylinder is formed. It is to make the wall parallel. Here, the creeping axial direction is a direction along the axis of the portion corresponding to the rough barrel wall that is inclined in an end-spreading manner and further along the normal line of the portion corresponding to the rough barrel wall (hereinafter, the same). The method for manufacturing a sheet metal pulley according to claim 3 is the method according to claim 1, wherein when the cylindrical rough barrel wall is formed, a spacing dimension shorter than a width of the rough barrel wall equivalent portion is maintained. By pressing the portion corresponding to the rough barrel wall between the pair of molding surfaces and compressing it in the creeping axial direction, the rough barrel wall and the thickened rough barrel wall are formed in parallel. It is to let. According to a fourth aspect of the present invention, there is provided a method for manufacturing a sheet metal pulley, wherein a belt-like cylindrical body wall is integrally provided on an outer periphery of a base body, and an ear portion is provided at an end portion of the body wall that is continuous with the base body. In a method for manufacturing a sheet metal pulley that is annularly bulged, by sandwiching a disc-shaped material with a press molding die that has a bending molding surface that includes a cornering portion, on the outer peripheral portion of the material, An angled corner portion and a portion corresponding to the rough barrel wall which is inclined in an end-spreading shape on the outer peripheral side of the corner portion are formed, and then the portion corresponding to the rough barrel wall is pushed inward by a pressing roller to make Bending while maintaining the square shape to form a cylindrical rough barrel wall continuous with the base body through the corner portion, and thereafter, within the thickness range of the base body on the inner peripheral side of the corner portion. Press the pointed molding surface of the ears molding roller onto the corner of the rough body wall at the location corresponding to So that it let out Zhang the annular ears by dividing sliding the portion put. A method for manufacturing a sheet metal pulley according to a fifth aspect is the method according to the fourth aspect, wherein press forming is performed when forming an angular corner portion and a rough barrel wall-corresponding portion inclined on an outer peripheral side of the corner portion. Forming the corner portion and increasing the wall thickness by applying the outer peripheral end surface of the material to the position regulating surface provided in the mold and compressing the portion of the material on the outer peripheral side of the corner portion in the creeping axial direction thereof. The formation of the rough wall that has been formed is performed in parallel. The method for manufacturing a sheet metal pulley according to a sixth aspect is the method according to the fourth aspect, wherein when the cylindrical rough barrel wall is formed, a spacing dimension shorter than a width of the rough barrel wall equivalent portion is maintained. By pressing the portion corresponding to the rough barrel wall between the pair of molding surfaces and compressing in the axial direction of the surface, the rough barrel wall and the thickened rough barrel wall are formed in parallel. It is to let.

[0011]

According to the method of manufacturing a sheet metal pulley according to the present invention, the end of the rough barrel wall connected to the base body is a square corner. ,
The pointed molding surface of the ears molding roller is pressed there to cause the ears to bulge out annularly, so that the pointed molding surface is pressed against the corner portion of the rough barrel wall at a location corresponding to the thickness range of the base body. Even in this case, it becomes possible to allow the sharpened molding surface to sufficiently dig into the corner portion, and the insufficient mass does not occur when the end portion of the rough barrel wall is slotted by the sharpened molding surface. Also,
After bending the outer peripheral portion of the material into an edge-spreading shape to form a slanted wall, the slanted wall is sandwiched with a press molding die having a bending molding surface having a cornering portion to form the corner of the corner portion. Since the procedure of forming the shape is adopted, the square shape of the corner can be formed without difficulty.

According to the sheet metal pulley manufacturing method of the second or third aspect of the present invention, the step of compressing the portion corresponding to the rough barrel wall in the axial direction of the surface to form the thickened rough barrel wall. However, it helps finish the corners into a square shape.

According to the sheet metal pulley manufacturing method of the fourth, fifth or sixth aspect of the present invention, the end of the rough barrel wall connected to the base body is a square corner. , Since the pointed molding surface of the ears molding roller is pressed there to make the ears project in an annular shape, the pointed molding surface is pressed against the corner of the rough barrel wall at a location corresponding to the thickness range of the base body. Even if this is done, it becomes possible to make the pointed molding surface sufficiently dig into the corner portion, and there is no lack of mass when the end portion of the rough barrel wall is slotted by the pointed molding surface. Further, since forming the angular corner portion and the inclined rough body wall equivalent portion on the outer peripheral portion of the material is performed at the same time or in tandem by sandwiching the material with the press molding die, these are separated. The production efficiency is higher than that in the process.

According to the sheet metal pulley manufacturing method of the present invention, the step of compressing the portion corresponding to the rough barrel wall in the axial direction of the surface to form the thickened rough barrel wall. However, it helps finish the corners into a square shape.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram showing a method of manufacturing a sheet metal pulley according to an embodiment of the present invention.

In this manufacturing method, a metal material such as a disk-shaped steel material or aluminum material having a predetermined thickness is first prepared, and this material is pressed to obtain the structure shown in FIG.
The molded body A1 shown in is formed. This molded body A1 is
Recessed portion 1 formed by drawing the inner peripheral portion of the above material
1 and an annular horizontal portion 12 around it (that is, the outer peripheral portion of the material). The recessed portion 11 is used as a bearing fitting portion for mounting a bearing such as a bearing.

The molded body A1 shown in FIG. 1 (a) is processed by bending the horizontal portion 12 in the depth direction D of the recessed portion 11 by a predetermined angle. FIG. 2 is an explanatory view of this bending step. As shown in the left side of the figure, the molded body A1 of FIG. 1 is set in the lower mold 32 having the receiving surface 31, and then shown in the right side of the figure. Thus, the upper mold 34 is lowered and the horizontal portion 12 of the molded body A1 is pressed against the receiving surface 31 by the pressing surface 33. A molded body A2 obtained through this step is shown in FIGS. 3 and 1B, and an inclined wall formed by bending is denoted by reference numeral 13.
Indicated by

A cornering process is performed on the inclined wall 13 of the molded body A2 of FIG. 1 (b). In this squeezing process, for example, the press mold illustrated in FIG. 4 is used.
This press mold has a squared-out portion 35 that is an angular corner.
an upper mold 36 having a bending molding surface 35 including a,
It has a lower mold 38 having a receiving surface 37 and the like. In the squeezing process, as shown on the left side of FIG. 4, the molded body A2 is set on the lower die 38, and then the upper die 36 is lowered as shown on the right side of the figure so that the inclined wall 13 of the molded body A2 is received on the receiving surface 37. And the bending molding surface 35. FIG. 1 (c) is an explanatory view showing a concrete example of a molded product A3 obtained through a scoring process. The molded product A3 has an angular corner 14 and an outer peripheral side of the corner 14. A rough body wall equivalent portion 15a that is inclined like a flared end is provided. In the molded body A3, the corner portion 14 is formed by the bending molding surface 3 described above.
Since it is formed by the squared-out portion 35a which is an angular corner of 5, there is no roundness in the contour line,
Or even if it has a roundness, it has only a very small radius of curvature. That is, the corner portion 14 is apparently sharp. In this way, the squaring process is performed as shown in FIG.
By performing this on the inclined wall 13 of the molded body A1, the square shape of the corner portion 14 can be formed without difficulty.

With respect to the molded body A3 shown in FIG. 1C, next, the portion 15a corresponding to the rough barrel wall is bent to form a cylindrical rough barrel wall 1.
5 is performed to obtain the molded body A4 of FIG. 1 (d). In this molded body A4, the cylindrical rough body wall 1
The square shape of the end portion of No. 5, that is, the square shape of the corner portion 14 is maintained as it is. Molded body A of FIG. 1 (d)
4 is, for example, the upper and lower rotary receiving molds 41, 42 shown in FIG.
Or the pressing roller 43 or the like. That is,
FIG. 1C set between the upper and lower rotary receiving molds 41 and 42.
While rotating the molded body A3, the rough drum wall equivalent portion 15a indicated by the phantom line is gradually pushed inward by the pressing roller 43 as indicated by the arrow a, and the rough drum wall equivalent portion 15a is depressed 1.
The molded body A4 is obtained by molding into a cylindrical rough barrel wall 15 parallel to the axis of No. 1. Even if the inclined wall 13 is pressed inward by the pressing roller 43, the corner portion 14 maintains its square shape.

The step of forming the ears 16 and the poly V groove 18 is performed on the rough body wall 15 of the molded body A4 of FIG. 1 (d), and the molded body of FIG. A5 is obtained.
The molded body A5 is then used as a sheet metal poly V groove pulley. The ear portion forming roller 44 as illustrated in FIG. 6 is used for forming the ear portion 16. The edge forming roller 44 has a pointed forming surface 45 in an annular shape. Then, while rotating the upper mold 46 and the lower mold 47 together with the molded body A4 set between them, the rough barrel wall 15
The pointed molding surface 45 is pressed against the corner portion 14 (see FIG. 4). The point where the pointed molding surface 45 is pressed against the corner portion 14 of the rough body wall 15 corresponds to a portion within the wall thickness range of the base body 10 on the inner peripheral side of the corner portion 14 (see FIG. 1).
(D) and FIG. 5 are shown by the symbol P, and the same applies hereinafter) . Here, the base body 10 is a portion surrounded by the corner portion 14, that is, the recessed portion 11 and a part of the inclined wall 13 connected to the recessed portion 11. In this way, the rough body wall 15
The pointed molding surface 45 fully digs into the corner portion 14 of the
The corner portion 14 is gradually slotted by the bite. Therefore, the meat is sufficiently extended outward to form the proper-shaped ear portion 16 without causing a lack of mass.
The poly V groove forming roller 48 shown in FIG. 7 is used for forming the poly V groove 18. This poly V groove forming roller 48
Has an uneven poly V groove forming surface 49, and the poly V groove forming surface 49 is formed as shown in FIG. 7 by pressing the poly V groove forming surface 49 against the rough barrel wall 15 while rotating the formed body. The sheet metal pulley shown in FIG. 8 is obtained. In the sheet metal pulley shown in the figure, a cylindrical body wall 20 for belting is integrally provided on the outer periphery of the base body 10 formed by the recessed portion 11 and a part of the inclined portion 13. The ear portion 16 has a configuration in which it is bulged in an annular shape at the end portion on the side that is continuously provided with.

In the method of manufacturing a sheet metal pulley described above, the rough body wall 15 of the molded body A4 shown in FIG. 1 (d) is not thickened. That is, the horizontal portion 12 of the molded body A1 of FIG. 1A, the inclined wall 13 and the rough body wall equivalent portion 1 of the molded bodies A2 and A3 of FIG. 1B and FIG. 1C.
5a, each wall thickness of the rough barrel wall 15 in the molded body A4 of FIG. 1D is the same or substantially the same (each thickness is indicated by T1). However, since the corner portion 14 of the rough barrel wall 15 before the formation of the ears is sharp, even if the rough barrel wall 15 is not thickened, the base body 10 is not thickened.
Even if the pointed forming surface 45 of the ear forming roller 44 is pressed against the corner portion 14 of the rough body wall 15 at a position P corresponding to the range of the wall thickness, The ear portion 16 having a proper shape is formed without being insufficient in mass because the meat is sufficiently bitten into the portion and the meat is sufficiently extended outward at the ear portion molding portion.

In this embodiment, the formation of the ears 16 and the poly V
Although the formation of the groove 18 is performed in a separate step so that the ear portion 16 further extends outward when the poly V groove described in FIG. 7 is formed, the poly V groove forming process shown in FIG. It is also possible to simultaneously perform the formation of the ears and the formation of the poly V groove only by the roller 48. Further, in this embodiment, the recessed portion 1 used as the bearing fitting portion is provided on the inner peripheral portion of the disc-shaped material.
However, it is not always necessary to form such a recessed portion 11, and for example, the base body 10 may be a flat plate.

FIG. 9 is an explanatory view showing the shapes of the molded products A6 and A7 obtained in the course of carrying out the method of manufacturing the sheet metal pulley according to the embodiment of the present invention.

In this embodiment, as described with reference to FIG. 1, when forming the angular corner portion 14 and the rough barrel wall equivalent portion 15a inclined in an end-spreading manner, the rough barrel wall equivalent portion 15a is thick. Be fleshed. That is, with respect to the inclined wall 13 of the molded body A2 described with reference to FIG. 1 (b), using the press molding die shown in FIG. It will be accompanied. The press mold of FIG. 10 has an upper mold 36 having a bending molding surface 35 having a squared-out portion 35a having an angular entry corner, a movable lower mold 38a having a receiving surface 37, and a position regulating surface 39. Fixed lower mold 38 with
b and so on. Then, after the molded body A2 is set in the movable lower mold 38a, as shown in the left side of FIG.
6 is lowered, and the inclined wall 13 is sandwiched between the receiving surface 37 and the bending molding surface 35, whereby the angular corner portion 14 is formed.
And a portion 15a corresponding to the rough barrel wall which is inclined outwardly on the outer peripheral side of the corner portion 14 thereof. And the receiving surface 37
While the inclined wall 13 is sandwiched by the bending molding surface 35 and the bending molding surface 35, the upper mold 36 and the movable lower mold 38a are lowered to move the outer peripheral end surface of the material (in this embodiment, the rough cylinder By applying the outer peripheral end surface of the wall equivalent portion 15a) to the position regulating surface 39 of the fixed lower mold 38b, the outer peripheral side portion of the corner portion 14 is compressed in the creeping axial direction (direction of arrow F) to correspond to the rough barrel wall. The part 15a is thickened. The molded product A6 molded in this manner is shown in FIG. 9 (a) and FIG. FIG. 9 (a)
Comparing the molded body A6 of FIG. 1 with the molded body A3 of FIG. 1C, the molded body A6 of FIG.
Is thicker than the wall thickness T1 of the portion 15a corresponding to the rough barrel wall of the molded body A3 of FIG. 1 (c). Therefore, the corner portion 14 formed by the squared-out portion 35a which is an angled corner of the bending surface 35 is apparently sharp.

For the molded body A6 of FIG. 9 (a), the portion 15a corresponding to the rough barrel wall is then bent to form a cylindrical rough barrel wall 1
5 is performed to obtain the molded body A7 of FIG. 9 (b). For the rough body wall 15 of the molded body A7, as shown in FIG.
7 and the molding of the poly V groove 18 described with reference to FIG. 7 is performed.

In the method for manufacturing the sheet metal pulley described with reference to FIG. 9, the rough barrel wall 15 of the molded body A7 shown in FIG. 9B is used.
Is thickened, and the corners 14 are sharp. Therefore, as described in FIG. 6 and FIG.
Even if the pointed forming surface 45 of the ear forming roller 44 is pressed against the corner portion 14 of the rough body wall 15 at a position P corresponding to the range of the wall thickness, As a result, the meat can be sufficiently bitten into the portion, and for this reason, the flesh extends sufficiently outward at the ears molding portion to form the ears 16 having a proper shape.

FIG. 12 is an explanatory view showing the shape of a molded body A8 obtained in the course of carrying out the method of manufacturing a pulley made of sheet metal according to the embodiment of the present invention.

In this embodiment, by forming the cylindrical rough barrel wall 15 described with reference to FIG. 1, the thick rough barrel wall 15 is formed. That is, FIG.
The rough body wall-corresponding portion 15a of the molded body A3 described in (c) is molded into the rough body wall 15 while increasing the wall thickness. In this step, as shown in FIG. 13, the above-mentioned molding is performed between a pair of upper and lower molding surfaces 81, 82 arranged with a space W1 shorter than the width W of the portion 15a corresponding to the rough body wall of the molded body A3.
An operation is performed in which the body A3 is set, the rough drum wall equivalent portion 15a is pressed inward by the pressing roller 83 as indicated by the arrow a, and the rough drum wall equivalent portion 15a is pushed between the molding surfaces 81 and 82. As a result, the portion corresponding to the rough barrel wall 15a is compressed in the creeping axis direction to be thickened, and thus the thickened rough barrel wall 15 is formed. Molded product A8 molded in this way
Is shown in FIG. The shape of the molded body A8 of FIG. 12 is similar to the molded body A7 of FIG. 9B, and the corner portion 14 is apparently pointed.

The ears and the poly V groove 18 described with reference to FIGS. 6 and 7 are formed on the rough body wall 15 of the formed body A8 shown in FIG.

In the sheet metal pulley manufacturing method described with reference to FIG. 12, the rough body wall 15 of the molded body A8 is thickened, and the corner portions 14 are sharp. Therefore, as described with reference to FIGS. 6 and 7, the pointed molding surface 45 of the ear molding roller 44 is pressed against the corner portion 14 of the rough body wall 15 at the position P corresponding to the thickness range of the base body 10. Also,
The pointed molding surface 45 sufficiently digs into the end portion of the rough body wall 15, so that the flesh extends sufficiently outward at the ears molding portion to form the ears 16 having a proper shape. It is.

FIG. 14 is an explanatory view showing a method of manufacturing a sheet metal pulley according to the embodiment of the invention described in claim 4.

In this embodiment, a disc-shaped steel material or aluminum material having a predetermined thickness is first prepared,
By pressing this material, the molded body A1 shown in FIG. 14A is formed. This molded body A1 is shown in FIG.
This is exactly the same as the molded body A1 of (a), and the manufacturing procedure is also the same.

With respect to the molded body A1 of FIG. 14 (a), the horizontal portion 12 is pressed to produce a molded body A9 of FIG. 14 (b). This molded body A9 is shown in FIG.
Corner portion 14 having the same shape as the molded body A3 of
And a portion 15a corresponding to the rough barrel wall that is inclined outwardly on the outer peripheral side of the corner portion 14 thereof. A press mold similar to that used to manufacture the molded body A3 of FIG. 1C can be used for manufacturing this molded body A9.

With respect to the molded body A9 of FIG. 14 (b), next, the portion 15a corresponding to the rough barrel wall is bent to form a cylindrical rough barrel wall 1.
14 is performed, and the molded body A1 of FIG.
0 is obtained. This molded body A10 has the same shape as the molded body A4 of FIG. 1D, and the manufacturing procedure is also the same.

Coarse body wall 15 of molded body A10 of FIG. 14 (c)
On the other hand, a step of forming the ears 16 and forming the poly V groove 18 is performed to obtain the molded body A11 of FIG. 14 (d). As shown in FIG.
The procedure is the same as that described in.

In the sheet metal pulley manufacturing method described with reference to FIG. 14, although the thick body wall 15 of the molded body A10 shown in FIG. 14 (c) is not thickened, the ear portion is formed. Since the corner portion 14 of the rough body wall 15 before the cutting is sharpened, the point forming roller 44 is sharpened on the corner portion 14 of the rough body wall 15 at the position P corresponding to the thickness range of the base body 10. Even when the molding surface 45 (see FIGS. 6 and 7) is pressed, the pointed molding surface 45 comes to sufficiently bite into the end portion of the rough barrel wall 15, and therefore the meat is sufficiently formed at the ear molding portion. The ears 16 having the proper shape are formed by extending outwardly and without causing insufficient mass.

FIG. 15 is an explanatory view showing the shapes of the molded products A12 and A13 obtained in the course of carrying out the method for manufacturing a sheet metal pulley according to the fifth embodiment of the invention.

In this embodiment, when forming the angular corner portion 14 and the rough barrel wall equivalent portion 15a that is inclined like an end spread as described in FIG. 14A, the rough barrel wall equivalent portion is formed. 15a is thickened. That is, FIG.
With respect to the horizontal portion 12 of the molded body A1 described in (a), cornering and formation of the thickened portion 15a corresponding to the rough barrel wall are performed in parallel. This step can be performed using a press mold similar to that described in FIG. That is, in this step, as shown in the right side of FIG.
Corner portion 14 that is angled to the horizontal portion 12 at the cornering portion 35a of the
And the horizontal portion 12 is bent into a flared shape by the bending molding surface 35, and the outer peripheral end surface of the material (in this embodiment, the outer peripheral end surface of the rough barrel wall equivalent portion 15a) is fixed to the position of the fixed lower mold 38b. By abutting against the regulation surface 39, the portion on the outer peripheral side of the corner portion 14 is compressed in the creeping axial direction (direction of arrow F), and the rough barrel wall equivalent portion 15a is thickened. The molded product A12 molded in this way is shown in FIG.
It is shown in. The molded product A12 shown in FIG.
Compared to the molded body A9 of (b), the molded body A12 of FIG. 15 (a) has a wall thickness T2 of the portion 15a corresponding to the rough barrel wall as shown in FIG. 14 (b).
The difference is that it is thicker than the wall thickness T1 of the portion 15a corresponding to the rough barrel wall of the molded body A9. Therefore, the corner portion 14 formed by the squared-out portion 35a which is an angled corner of the bending surface 35 is apparently sharp.

For the molded body A12 of FIG. 15 (a),
Next, the step of bending the portion 15a corresponding to the rough barrel wall to form the cylindrical rough barrel wall 15 is performed, and the molded body A of FIG.
13 is obtained. The ears and the poly V groove described with reference to FIGS. 6 and 7 are formed on the rough body wall 15 of the formed body A13.

In the sheet metal pulley manufacturing method described with reference to FIG. 15, the rough barrel wall 15 of the molded body A13 shown in FIG. 15 (b) is thickened, and the corner portion 14 is sharp. Therefore, as described with reference to FIGS. 6 and 7, the pointed molding surface 45 of the ear molding roller 44 is pressed against the corner portion 14 of the rough body wall 15 at the position P corresponding to the thickness range of the base body 10. However, the pointed molding surface 45 comes to bite into the end portion of the rough barrel wall 15 sufficiently, and therefore, the meat is sufficiently extended outward at the ear portion molding portion and the ear portion 16 having the proper shape is formed. It is formed.

FIG. 16 is an explanatory view showing the shape of the molded body A14 obtained in the course of carrying out the method for manufacturing a sheet metal pulley according to the embodiment of the invention described in claim 6.

In this embodiment, the rough cylindrical wall 15 having a large thickness is formed by forming the cylindrical rough cylindrical wall 15 described with reference to FIG. That is, FIG.
The rough body wall 15 is molded while thickening the portion corresponding to the rough body wall 15a of the molded body A9 described in 4 (b).
In this step, the same mold as the mold described in FIG. 13 can be used, and the molding procedure is also the same. The shape of the molded body A14 of FIG. 16 thus molded is shown in FIG.
Similar to the molded body A13 of (b), the corner portion 14 is apparently pointed.

The ears and the poly V groove 18 described with reference to FIGS. 6 and 7 are formed on the rough body wall 15 of the formed body A14 shown in FIG.

In the sheet metal pulley manufacturing method described with reference to FIG. 16, the rough body wall 15 of the molded body A14 is thickened, and the corner portions 14 are sharp. Therefore, as described with reference to FIGS. 6 and 7, the pointed molding surface 45 of the ear molding roller 44 is pressed against the corner portion 14 of the rough body wall 15 at the position P corresponding to the thickness range of the base body 10. Also,
The pointed molding surface 45 sufficiently digs into the end portion of the rough body wall 15, so that the flesh extends sufficiently outward at the ears molding portion to form the ears 16 having a proper shape. It is.

1, FIG. 9, FIG. 12, FIG. 14, FIG. 15 and FIG. 16, the same or corresponding parts are denoted by the same reference numerals and detailed description thereof is omitted.

[0046]

According to the sheet metal pulley manufacturing method of the invention described in each of the claims, the pointed molding surface of the ear forming roller is pressed against the angled corner portion of the rough barrel wall to scrape the corner portion. Since the ring-shaped ears are bulged by splitting, even if the pointed molding surface is pressed against the above-mentioned corners at a location corresponding to the range of the thickness of the base body, there is insufficient mass when forming the ears (insufficient wall thickness). It is possible to reliably form the ear portion having a proper shape without causing the occurrence. Further, there is also an effect that it is possible to easily form an angular corner portion from a disc-shaped material.

Particularly, according to the method of manufacturing a sheet metal pulley according to the invention of claim 4, claim 5 or claim 6, the number of steps is reduced and the production efficiency is improved.
According to the method of manufacturing a sheet metal pulley according to any one of claims 2, 3, 5, and 6, for forming an ear portion on an angular corner portion of a thickened rough barrel wall. By pressing the pointed molding surface of the roller and slitting the corners of the rough barrel wall, the annular ears are bulged, so that it is possible to more reliably form properly shaped ears. is there.

[Brief description of drawings]

1 (a) to 1 (e) are explanatory views showing the shape of each molded product obtained by carrying out the method for manufacturing a pulley made of sheet metal according to the embodiment of the invention described in claim 1.

FIG. 2 is an explanatory diagram of a press mold used for bending a horizontal portion of a molded body.

FIG. 3 is a partial cross-sectional view of a molded body that is molded by bending a horizontal portion of the molded body.

FIG. 4 is an explanatory view of a press-molding die used in a process of molding a corner portion on an inclined wall of a molded body.

FIG. 5 is an explanatory diagram showing a pressing roller and the like.

FIG. 6 is an explanatory diagram of ear molding.

FIG. 7 is an explanatory diagram of ear molding and poly-V groove molding.

FIG. 8 is a sectional view of a molded sheet metal pulley.

9 (a) and 9 (b) are explanatory views showing the shape of each molded product obtained by carrying out the method for manufacturing a sheet metal pulley according to the embodiment of the present invention.

FIG. 10 is an explanatory view showing a press-molding die for forming a corner of a molded body with respect to an inclined wall and forming a thickened portion corresponding to a rough barrel wall.

FIG. 11 is a cross-sectional view of a molded body in which a corner cutout and a portion corresponding to the rough barrel wall are formed.

FIG. 12 is an explanatory view showing the shape of each molded body obtained by performing the method for manufacturing a sheet metal pulley according to the embodiment of the invention described in claim 3;

FIG. 13 is an explanatory diagram showing an example of a procedure of compressing a portion corresponding to the rough barrel wall in the creeping axis direction to increase the thickness.

14 (a) to 14 (d) are explanatory views showing the shape of each molded product obtained by performing the method for manufacturing a sheet metal pulley according to the embodiment of the present invention.

15 (a) and 15 (b) are explanatory views showing the shape of each molded product obtained by carrying out the method for manufacturing a sheet metal pulley according to the embodiment of the present invention.

FIG. 16 is an explanatory view showing the shape of each molded body obtained by performing the method for manufacturing a sheet metal pulley according to the embodiment of the invention described in claim 6;

FIG. 17 is a cross-sectional view showing the shape of a molded body obtained in an intermediate step when manufacturing a sheet metal pulley by a conventional method.

FIG. 18 is a cross-sectional view showing another shape of a molded body obtained in an intermediate step when manufacturing a sheet metal pulley by a conventional method.

FIG. 19 is an explanatory diagram of ear molding according to a conventional method.

[Explanation of symbols]

10 Base 13 Sloping Wall 14 Corner 15 Rough Wall 15a Rough Wall Corresponding Part 16 Ear 35a Angled Out 35 Bending Molding Surface 39 Position Limiting Surface 43,83 Pressing Roller 44 Ear Molding Roller 45 Pointing Molding Surface F Creeping axial direction W Width of rough barrel wall equivalent W1 Space dimension P of a pair of molding surfaces Corresponding to the thickness range of the base body at the corner of the rough barrel wall
Where to do

Claims (6)

(57) [Claims] 1. A sheet metal member, in which a cylindrical body wall for belting is integrally provided on the outer periphery of a base body, and an ear portion is annularly extended at an end portion of the body wall side which is continuous with the base body. In the method of manufacturing a pulley, after bending an outer peripheral portion of a disc-shaped material into an end-spreading shape to form an inclined wall, the inclined wall is formed by a press forming die having a bending forming surface having a squared-out portion. An angled corner portion formed by the angled portion and a rough body wall-corresponding portion inclined toward the outer peripheral side of the corner portion in a flared shape are formed. By pressing inward with, the corner portion is bent while keeping the square shape to form a cylindrical rough barrel wall continuous with the base body through the corner portion. At the corner of the rough body wall at a location corresponding to the thickness range of the base on the inner peripheral side Method for producing a sheet metal pulley for causing out Zhang ears annularly by dividing sliding its position against the previously pointed molding surface parts forming roller. 2. The position regulation provided in a press molding die according to claim 1, wherein when forming an angular corner portion and a portion corresponding to a rough drum wall which is inclined like an end spread, a press molding die is provided. The outer peripheral end face of the material is applied to the surface and the outer peripheral portion of the material is compressed in the axial direction of the creeping surface to form the corner portion and the thickened rough wall equivalent portion. And a method of manufacturing a sheet metal pulley. 3. The method of manufacturing a sheet metal pulley according to claim 1, wherein when forming the cylindrical rough barrel wall, a pair of paired rolls are arranged with a spacing dimension shorter than a width of the rough barrel wall equivalent portion. A sheet metal product that allows the formation of the rough barrel wall and the formation of the thickened rough barrel wall by pushing the portion corresponding to the rough barrel wall between the molding surfaces and compressing in the creeping axial direction. Manufacturing method of pulley. 4. A sheet metal body, in which a cylindrical body wall for belting is integrally provided on the outer periphery of a base body, and an ear portion is annularly extended at an end portion of the body wall side which is continuous with the base body. In a method for manufacturing a pulley, a disc-shaped material is sandwiched by a press mold having a bending molding surface having a cornering portion, so that an angular corner portion and its corner portion are formed on the outer peripheral portion of the material. Form a portion corresponding to the rough drum wall that is inclined toward the end on the outer peripheral side and then press the inward portion of the rough drum wall inward with a pressing roller to fold the corner portion while maintaining the square shape. Form a cylindrical rough barrel wall continuous with the base body through the corner portion,
After that, the pointed molding surface of the ear forming roller is pressed against the corner portion of the rough barrel wall at a location corresponding to the inside of the thickness of the base body on the inner peripheral side of the corner portion, and the location is slotted. A method for manufacturing a sheet-metal pulley, wherein the ear portion is thereby projected in a ring shape. 5. The method for manufacturing a sheet metal pulley according to claim 4, wherein the press forming die is provided when forming an angular corner portion and a portion corresponding to a rough barrel wall inclined on an outer peripheral side of the corner portion. The outer peripheral end face of the material is applied to the formed position control surface, and the outer peripheral side portion of the material is compressed in the axial direction of the creeping surface to form the corner portion and increase the thickness of the roughened portion. A method for manufacturing a pulley made of sheet metal, which is performed in parallel with forming a portion corresponding to a body wall. 6. The method for manufacturing a sheet metal pulley according to claim 4, wherein when the cylindrical rough body wall is formed, a pair of a pair of gaps is arranged so as to maintain a distance shorter than a width of the rough body wall equivalent portion. A sheet metal product that allows the formation of the rough barrel wall and the formation of the thickened rough barrel wall by pushing the portion corresponding to the rough barrel wall between the molding surfaces and compressing in the creeping axial direction. Manufacturing method of pulley.