JPH0857564A - Production of pulley - Google Patents

Abstract

PURPOSE: To produce the pulley, in which flange part is formed without receiving excessive force and which has stability and durability. CONSTITUTION: The pulley base body 3 having a bottom plate part 2 and cylinder part 1 is compressed and rotated while clamped both by a first clamper 8, in which a first tapered forming groove part 6 is formed to the root part of cylindrical projecting part 5 and a tapered forming recessed face 7 is formed at the tip of cylindrical projecting part 5 and a second clamper 11, which has both a tapered forming projecting face 9 to form a bottom part 2 as a support part 2A of tapered recessed shape by pressing the outer side face of bottom plate part 2 to the tapered forming recessed face 7 and a second tapered forming groove part 10 to form the outer peripheral part of bottom plate part 2 to a tapered shape. Further, a roller die 14, in which the outer peripheral part is made to a forming projecting part 14A of belt hooking part, is pressed to the outer peripheral face of cylinder part 1 to reduce the diameter, a belt hooking part 1A is formed and flange parts 16, 17 are formed on both sides thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a pulley base body in which the outer peripheral surface of a cylindrical portion of a bottomed cylindrical body formed by drawing a metal plate is used as a belt-forming portion forming surface and the bottom plate portion is used as a supporting portion. The present invention relates to a method for manufacturing a pulley in which flange portions for preventing the belt from falling off are formed at both ends of the cylindrical portion.

[0002]

2. Description of the Related Art One of the methods of manufacturing a pulley is a method of manufacturing by rolling. In this method, a bottomed cylindrical body formed by drawing a metal plate is used as a pulley base whose outer peripheral surface is a belt-engaging forming surface and whose bottom plate is a supporting portion. A roller die is pressed against the surface to form a belt hooking portion, and flange portions for preventing the belt from falling are formed at both ends thereof.

[0003]

However, in the conventional method of manufacturing a pulley, it is unreasonable to crush the corner portion formed by the bottom plate portion and the cylindrical portion of the bottomed cylindrical body to form the flange portion, and it becomes thin. Therefore, there is a problem that the strength is lowered and the chip easily occurs. Further, since the supporting portion of the pulley manufactured by the conventional method has a flat linear shape and exists on one side in the width direction of the belt hooking portion, the inward force acting on the belt hooking portion is laterally applied. Therefore, there is a problem that the supporting portion is likely to be bent and deformed.

An object of the present invention is to provide a stable and durable pulley which does not require any effort when forming a flange portion formed by crushing a corner portion formed by a bottom plate portion and a cylindrical portion of a bottomed cylindrical body. It is to provide a manufacturing method.

[0005]

According to the present invention, a bottomed cylindrical body made of a drawn product of a metal plate in which one end of the cylindrical portion is closed by a bottom plate portion is provided, and the outer peripheral surface of the cylindrical portion is belted. It is a pulley base body having a bottom molding portion as a support portion.

In the method of manufacturing a pulley according to claim 1,
The pulley base has a cylindrical protrusion having a diameter smaller than the inner diameter of the cylindrical portion and shorter than the cylindrical portion, and the base of the cylindrical protrusion is brought into contact with the open end of the cylindrical portion and spreads it in the centrifugal direction. A first taper forming groove portion is formed and a taper forming concave surface is formed at a tip of the cylindrical protrusion.
And a tapered molding convex surface that abuts the outer surface of the bottom plate portion and presses the outer surface against the tapered molding concave surface of the first clamper to mold the bottom plate portion as the tapered concave support portion. And a second tapered forming groove for forming the outer peripheral portion of the bottom plate in a tapered shape
Clamp with the clamper.

The first and second clampers rotate while compressing the cylindrical portion in the axial direction. In this state,
While pressing the belt hook forming convex portion of the roller die whose outer peripheral portion is the belt hook forming convex portion to the substantially central portion of the outer peripheral surface of the cylindrical portion to reduce the diameter of this portion, the roller die By moving in the axial direction of the cylindrical portion with the compression by the first and second clampers, a concave belt hooking portion is formed in the substantially central portion of the cylindrical portion, and the opening of the opening portion of the cylindrical portion is formed. The end is the first of the first clamper.
Of the roller die that spreads out by the taper-shaped groove portion and moves the corner portion formed by the bottom plate portion and the cylinder portion in the axial direction of the cylinder portion and the second taper-shaped groove portion of the second clamper. Crushing is performed to form flange portions on both sides of the cylindrical portion while pressing the tip ends of the flange portion tip pressing portions of the first and second tapered molding groove portions.

In the pulley manufacturing method according to the second aspect,
The pulley base has a cylindrical protrusion having a diameter smaller than the inner diameter of the cylindrical portion and shorter than the cylindrical portion, and the base of the cylindrical protrusion is brought into contact with the open end of the cylindrical portion and spreads it in the centrifugal direction. A first clamper having a first tapered molding portion and a tapered molding concave surface formed at the tip of the cylindrical protrusion; and an outer surface of the bottom plate portion abutting the outer surface of the first clamper. The bottom plate part is clamped by a second clamper having a tapered molding convex surface for molding the bottom plate portion as the tapered concave supporting portion by pressing the tapered molding concave surface.

The first and second clampers rotate while compressing the cylindrical portion in the axial direction. In this state,
The outer peripheral portion of the roller die has a convex portion for forming a belt engaging portion and has a flange tip pressing portion on both side surfaces, and the convex portion for forming a belt engaging portion is pressed against the substantially central portion of the outer peripheral surface of the cylindrical portion. By moving the roller die in the axial direction of the cylindrical portion with the compression by the first and second clampers while reducing the diameter of the cylindrical die, a concave belt hooking portion is formed in the substantially central portion of the cylindrical portion. While forming, the opening end of the opening of the cylindrical portion is expanded by the first tapered forming portion of the first clamper, and the corner portion formed by the bottom plate portion and the cylindrical portion is formed in the axial direction of the cylindrical portion. Crushing is performed by the moving roller die and the tapered molding convex surface of the second clamper to form flange portions on both sides of the cylindrical portion while pressing the tip ends of the flange portion tip pressing portions.

[0010]

According to the pulley manufacturing method of the first aspect,
In forming a flange portion formed by crushing a corner portion formed by the bottom plate portion and the cylindrical portion, a roller die for moving the corner portion in the axial direction of the cylindrical portion and a second clamper second
If it is crushed by the taper-shaped forming groove portion, the flange portion can be formed without being forced. Like the method for manufacturing a pulley according to claim 2, a roller die for forming a flange portion formed by crushing a corner portion formed by a bottom plate portion and a cylindrical portion and moving the corner portion in the axial direction of the cylindrical portion. And the tapered molding convex surface of the second clamper, the flange portion can be molded without force.

In the method for manufacturing a pulley according to claims 1 and 2, the cylindrical protrusion of the first clamper has a smaller diameter than the inner diameter of the cylindrical portion of the pulley base, and is between the cylindrical portion and the cylindrical protrusion. With a gap between the cylindrical parts, the widthwise ends of the cylindrical part are clamped by the first and second clampers, and the substantially central part of the outer peripheral surface of the cylindrical part is attached to the belt hooking part on the outer periphery of the roller die. When the belt hooking portion is formed by pressing the forming convex portion to bend and form the belt hooking portion, the belt hooking portion is formed with a smaller force as compared with the case where the belt hooking portion is formed only by the crushing force in the axial direction of the cylindrical portion. Molding of parts can be performed.

Further, as in the method for manufacturing a pulley according to claims 1 and 2, the first clamper having a tapered molding concave surface formed at the tip of the cylindrical protruding portion and the outer surface of the bottom plate portion are contacted with each other. When the bottom plate portion is clamped and molded by the second clamper having the tapered molding convex surface that presses the side surface against the tapered molding concave surface of the first clamper, the bottom plate portion is molded as the tapered concave supporting portion. It

As described above, when the support portion is formed in the tapered concave shape, the center of the support portion comes to be on the center side in the width direction of the belt hooking portion, and therefore acts on the belt hooking portion. The inward force that is applied can be received at the center of the support portion existing on the center side in the width direction of the belt hooking portion, and stability and durability are increased.

[0014]

1 to 6 show a first embodiment of a method for manufacturing a pulley according to the present invention. First, a metal plate is squeezed by a press or the like to form a bottomed cylindrical body made of a drawn product having a shape in which one end of the cylindrical portion 1 is closed by a bottom plate portion 2. The bottomed cylindrical body is used to hold the cylindrical portion 1 The outer peripheral surface of the above is used as a belt hanging portion molding surface, and the bottom plate portion 2 is used as a supporting portion to form a pulley base 3 (FIG. 1). In this case, the cylindrical portion 1 is formed wider than the belt width, and the hole 4 is provided at the center of the bottom plate portion 2.

Next, as shown in FIG. 4, the pulley base material 3
Has a cylindrical protruding portion 5 having a smaller diameter than the inner diameter of the cylindrical portion 1 and shorter than the cylindrical portion 1, and abuts the base end of the cylindrical protruding portion 5 at the open end of the cylindrical portion 1 and spreads it in the centrifugal direction. And a first clamper 8 in which a tapered molding groove 6 is formed and a tapered molding concave surface 7 is formed at the tip of the cylindrical protruding portion 5, and the outer surface of the bottom plate portion 2 is brought into contact with the first clamper 8. 8 is pressed against the tapered molding concave surface 7 to mold the bottom plate portion 2 as a tapered concave supporting portion 2A (see FIGS. 2 and 5), and the outer peripheral portion of the bottom plate portion 2 is tapered. It clamps by the 2nd clamper 11 which has the 2nd taper-shaped shaping | molding groove part 10 to shape | mold. In this case, since the outer diameter of the cylindrical protrusion 5 is smaller than the inner diameter of the cylindrical portion 1, a gap 22 is provided between them.

A positioning protrusion 12 is provided at the center of the tapered molding concave surface 7 of the first clamper 8,
The positioning protrusion 12 is passed through the hole 4 at the center of the bottom plate portion 2 and protruded to the opposite side. Corresponding to this, a positioning hole 13 is formed in the center of the tapered molding convex surface 9 of the second clamper 11.
And the tip of the positioning projection 12 is fitted into the positioning hole 13.

The first and second clampers 8 and 11 rotate the cylindrical portion 1 while compressing it in the axial direction. In this state, as shown in FIG. 4, the roller die 14 whose outer peripheral portion is a belt hook forming convex portion 14A corresponding to the belt width.
The belt hanging portion forming convex portion 14A is pressed against the substantially central portion of the outer peripheral surface of the cylindrical portion 1. The roller die 14 presses the cylindrical portion 1 in the axial direction to reduce the diameter thereof and moves the same in the same direction as the first clamper 8 moves in compression.

Next, while rotating the first and second clampers 8 and 11 and the roller die 14, the first clamper 8 is compressed in the axial direction, that is, the direction of the second clamper 11, and the roller die 14 is cylindrical. It is pressed in the axial direction of the part 1.

By the compression of the first clamper 8 and the pressing of the roller die 14, the diameter of the substantially central portion of the outer peripheral surface of the cylindrical portion 1 is gradually reduced by the pressing of the roller die 14. At the same time, the cylindrical portion 1 by the first clamper 8
The compression causes the first tapered molding groove portion 6 of the first clamper 8 to expand the open end of the cylindrical portion 1 whose center portion is axially pressed by the roller die 14 in the centrifugal direction ( (See FIG. 5) Further, by continuing the compression by the first clamper 8 and the pressing by the roller die 14, the diameter of the central portion of the cylindrical portion 1 abuts on the outer periphery of the cylindrical protruding portion 5 of the first clamper 8. Is reduced, and the open end of the cylindrical portion 1 is further expanded by the first taper-shaped groove 6 and the first taper-shaped groove 6 is formed.
The flange portion 16 is formed in the opening portion of the cylindrical portion 1 by being pinched by and the side surface of the roller die 14. On the other hand, a corner portion 15 formed by the cylindrical portion 1 and the bottom plate portion 2 (see FIGS. 1 and 4).
On the reference side, the diameter of the cylindrical portion 1 is reduced by pressing the roller die 14 and the second clamper 8 is used.
Of the corner portion 1 by the compression operation of the
5, the bottom plate portion 2 side is pressed against the second tapered molding groove portion 10 side, and the cylindrical portion 1 side of the corner portion 15 is pressed against the side surface of the roller die 14 to be crushed, and the cylindrical portion 1 and the bottom plate portion 2 are crushed. Flange portion 1 on the corner portion 15 side formed by
7 is formed (see FIGS. 2 and 5).

In this way, the belt hooking portion 1A having a reduced diameter is formed in the central portion of the cylindrical portion 1, and the flange portions 16 and 17 are formed on both sides thereof to complete the pulley 18 as shown in FIG. . When forming these flange portions 16 and 17, the first and second tapered groove portions 6 and 10 are formed.
Each of the flange parts 1A and 10A with the flange end tip pressing parts 6A and 10A
The formation is performed while pressing the tips of Nos. 6 and 17.

The pulley 18 thus completed is
Although the belt hooking portion 1A becomes a smooth belt hooking pulley, when manufacturing a pulley for hanging a V belt, the belt hooking portion 1A molded as described above is provided with a predetermined V belt as shown in FIG. A roller die 20 having a plurality of V-shaped ridges 19 formed on the outer periphery thereof is pressed. By pressing the roller die 20, the V pulley 18 having a plurality of V grooves 21 formed on the surface of the belt hooking portion 1A is completed (see FIG. 3).

As in the pulley manufacturing method of the first embodiment, the corner portion 1 formed by the cylindrical portion 1 and the bottom plate portion 2 is formed.
The flange portion 17 formed by crushing 5 is pressed by the roller die 14 that moves the corner portion 15 in the axial direction of the cylindrical portion 1 and the second tapered forming groove portion 10 of the second clamper 11. If it is crushed, the flange portion 17 can be molded without overstressing.

Further, as in this embodiment, the diameter of the cylindrical protrusion 5 of the first clamper 8 is set to be smaller than the inner diameter of the cylindrical portion 1 of the pulley base body 3 and the space between the cylindrical portion 1 and the cylindrical protrusion 5 is reduced. With the gap 22 left open, while sandwiching both ends in the width direction of the cylindrical portion 1 with the first and second clampers 8 and 11,
When the belt hanging portion forming convex portion 14A on the outer circumference of the roller die 14 is pressed to bend the substantially central portion of the outer peripheral surface of the cylindrical portion 1 to form the belt hanging portion 1A, the axis line of the cylindrical portion 1 is formed. As compared with the case where the belt hooking portion 1A is formed only by the crushing force in the direction, the belt hooking portion 1A can be formed with a small force.

Further, as in this embodiment, the cylindrical protrusion 5
A first clamper 8 having a tapered molding concave surface 7 formed at its tip, and a tapered molding convex surface 9 that abuts the outer surface of the bottom plate portion 2 and presses the outer surface against the tapered molding concave surface 7 of the first clamper 8. When the bottom plate portion 2 is clamped and molded by the second clamper 11 having the, the bottom plate portion 2 is molded as a tapered concave support portion 2A.

When the support portion 2A is formed into a tapered concave shape in this manner, the center of the support portion 2A is located at the belt hooking portion 1A.
Present on the center side in the width direction of the belt, so that the inward force acting on the belt hook 1A is applied to the belt hook 1A.
Since it can be received at the center of the support portion 2A existing on the center side in the width direction, stability and durability are increased.

7 to 9 show a second embodiment of the method for manufacturing a pulley according to the present invention. Also in this embodiment, a bottomed cylindrical body made of a drawn product having a shape in which one end of the cylindrical portion 1 is closed by the bottom plate portion 2 is formed by drawing a metal plate with a press or the like, and the bottomed cylindrical body is used to The outer peripheral surface of the cylindrical portion 1 is used as a belt-engaging portion molding surface, and the bottom plate portion 2 is used as a support portion to form a pulley base 3 (FIG. 1). In this case, the cylindrical portion 1 is formed wider than the belt width, and the hole 4 is provided at the center of the bottom plate portion 2.

Next, as shown in FIG. 7, the pulley base material 3
Has a cylindrical protruding portion 5 having a smaller diameter than the inner diameter of the cylindrical portion 1 and shorter than the cylindrical portion 1, and abuts the base end of the cylindrical protruding portion 5 at the open end of the cylindrical portion 1 and spreads it in the centrifugal direction. And a first clamper 8 in which a tapered molding portion 23 is formed and a tapered molding concave surface 7 is formed at the tip of the cylindrical protruding portion 5, and the outer surface of the bottom plate portion 2 is brought into contact with the first clamper 8. The bottom plate portion 2 is clamped by a second clamper 11 having a tapered molding convex surface 9 which presses the tapered molding concave surface 8 to mold the bottom plate portion 2 as a tapered concave support portion 2A (see FIGS. 2 and 3). In this case, since the outer diameter of the cylindrical protrusion 5 is smaller than the inner diameter of the cylindrical portion 1, a gap 22 is provided between them.

A positioning protrusion 12 is provided at the center of the tapered molding concave surface 7 of the first clamper 8,
The positioning protrusion 12 is passed through the hole 4 at the center of the bottom plate portion 2 and protruded to the opposite side. Corresponding to this, a positioning hole 13 is formed in the center of the tapered molding convex surface 9 of the second clamper 11.
And the tip of the positioning projection 12 is fitted into the positioning hole 13.

The first and second clampers 8 and 11 rotate the cylindrical portion 1 while compressing it in the axial direction. In this state, as shown in FIG. 7, the outer peripheral portion of the roller die 14 has a belt engaging portion forming convex portion 14A corresponding to the belt width and has flange tip end pressing portions 14B on both side surfaces. The molding convex portion 14A is pressed against the substantially central portion of the outer peripheral surface of the cylindrical portion 1. The roller die 14 presses the cylindrical portion 1 in the axial direction to reduce the diameter thereof and moves the same in the same direction as the first clamper 8 moves in compression.

Next, while rotating the first and second clampers 8 and 11 and the roller die 14, the first clamper 8 is compressed in the axial direction, that is, the direction of the second clamper 11, and the roller die 14 is cylindrical. It is pressed in the axial direction of the part 1.

By the compression of the first clamper 8 and the pressing of the roller die 14, first, the diameter of the substantially central portion of the outer peripheral surface of the cylindrical portion 1 is gradually reduced by the pressing of the roller die 14. At the same time, the cylindrical portion 1 by the first clamper 8
The first tapered molding portion 23 of the first clamper 8 pushes the opening end of the cylindrical portion 1 whose center portion is axially pressed by the roller die 14 in the centrifugal direction by compressing ( (See FIG. 8) Further, by continuing the compression by the first clamper 8 and the pressing by the roller die 14, the diameter of the central portion of the cylindrical portion 1 abuts on the outer periphery of the cylindrical protrusion 5 of the first clamper 8. Is reduced, and the open end of the cylindrical portion 1 is further expanded by the first tapered molding portion 23, and the first tapered molding portion 23 is expanded.
The flange portion 16 is formed in the opening portion of the cylindrical portion 1 by being pinched by and the side surface of the roller die 14. On the other hand, a corner portion 15 formed by the cylindrical portion 1 and the bottom plate portion 2 (see FIG. 1)
On the side, the diameter of the cylindrical portion 1 is reduced by pressing the roller die 14 and the compression operation of the first clamper 8 toward the second clamper 11 causes the bottom plate 2 side of the corner 15 to have a tapered molding convex surface. 9 side, and the cylindrical portion 1 side of the corner portion 15 is pressed by the side surface of the roller die 14 and crushed, and the flange portion 17 is formed on the corner portion 15 side formed by the cylindrical portion 1 and the bottom plate portion 2. (See FIGS. 2 and 8).

In this way, the belt hooking portion 1A having a reduced diameter is formed in the central portion of the cylindrical portion 1, and the flange portions 16 and 17 are formed on both sides thereof to complete the pulley 18 as shown in FIG. . When forming the flange portions 16 and 17, the flange die tip pressing portion 14B of the roller die 14 is used to press the tip portions of the flange portions 16 and 17.

The pulley 18 thus completed is
Although the belt hooking portion 1A becomes a smooth belt hooking pulley, when manufacturing a pulley for hooking a V belt, the belt hooking portion 1A molded as described above is provided with a predetermined V belt as shown in FIG. According to the above, a plurality of V ridges 19 are formed on the outer periphery, and the roller die 20 having the flange tip pressing portion 20A is pressed against both side surfaces. By pressing the roller die 20, the V pulley 18 having a plurality of V grooves 21 formed on the surface of the belt hooking portion 1A is completed (see FIG. 3).

As in the method of manufacturing the pulley of the second embodiment, the corner portion 1 formed by the cylindrical portion 1 and the bottom plate portion 2 is formed.
The flange portion 17 formed by crushing 5 is crushed by crushing the corner portion 15 by the roller die 14 that moves in the axial direction of the cylindrical portion 1 and the tapered molding convex surface 9 of the second clamper 11. With this, the flange portion 17 can be formed without being forced.

Further, as in this embodiment, the diameter of the cylindrical protrusion 5 of the first clamper 8 is set to be smaller than the inner diameter of the cylindrical portion 1 of the pulley base 3, and the cylindrical protrusion 1 is provided between the cylindrical portion 1 and the cylindrical protrusion 5. With the gap 22 left open, while sandwiching both ends in the width direction of the cylindrical portion 1 with the first and second clampers 8 and 11,
When the belt hanging portion forming convex portion 14A on the outer circumference of the roller die 14 is pressed to bend the substantially central portion of the outer peripheral surface of the cylindrical portion 1 to form the belt hanging portion 1A, the axis line of the cylindrical portion 1 is formed. As compared with the case where the belt hooking portion 1A is formed only by the crushing force in the direction, the belt hooking portion 1A can be formed with a small force.

Further, as in the present embodiment, the cylindrical protrusion 5
A first clamper 8 having a tapered molding concave surface 7 formed at its tip, and a tapered molding convex surface 9 that abuts the outer surface of the bottom plate portion 2 and presses the outer surface against the tapered molding concave surface 7 of the first clamper 8. When the bottom plate portion 2 is clamped and molded by the second clamper 11 having the, the bottom plate portion 2 is molded as a tapered concave support portion 2A.

When the support portion 2A is formed in the tapered concave shape in this manner, the center of the support portion 2A is located at the belt hooking portion 1A.
Present on the center side in the width direction of the belt, so that the inward force acting on the belt hook 1A is applied to the belt hook 1A.
Since it can be received at the center of the support portion 2A existing on the center side in the width direction, stability and durability are increased.

[0038]

In the pulley manufacturing method according to the first aspect of the present invention, the flange portion formed by crushing the corner portion formed by the bottom plate portion and the cylindrical portion is formed by moving the corner portion in the axial direction of the cylindrical portion. Since the crushing is performed by the roller die and the second tapered forming groove portion of the second clamper, the flange portion can be formed without being forced.

In the pulley manufacturing method according to the second aspect,
The flange portion formed by crushing the corner portion formed by the bottom plate portion and the cylindrical portion is pressed by the roller die that moves the corner portion in the axial direction of the cylindrical portion and the tapered molding convex surface of the second clamper. Since the crushing is performed, it is possible to mold the flange portion without overdoing it.

In the pulley manufacturing method according to the first and second aspects, the cylindrical protrusion of the first clamper is made smaller in diameter than the inner diameter of the cylindrical portion of the pulley base, and a gap is provided between the cylindrical portion and the cylindrical protrusion. With both ends of the cylindrical portion in the width direction sandwiched by the first and second clampers, the outer peripheral surface of the cylindrical portion is approximately centered on the outer periphery of the roller die. Since the belt hooking portion is formed by pressing with a portion to bend and form the belt hooking portion, the belt hooking portion can be formed with a small force as compared with the case where the belt hooking portion is formed only by the crushing force in the axial direction of the cylindrical portion. Molding can be performed.

Further, in the method of manufacturing a pulley according to the first and second aspects, the first clamper in which the tapered molding concave surface is formed at the tip of the cylindrical protruding portion and the outer surface of the bottom plate portion are brought into contact with the outer surface of the first clamper. Since the bottom plate portion is clamped and molded by the second clamper having the tapered molding convex surface that presses against the tapered molding concave surface of the first clamper, the bottom plate portion is molded as the tapered concave supporting portion. You can

As described above, when the supporting portion is formed in the tapered concave shape, the center of the supporting portion is located on the center side in the width direction of the belt hooking portion, so that the inner portion that acts on the belt hooking portion is formed. The directional force can be received at the center of the support portion existing on the center side in the width direction of the belt hooking portion, and stability and durability can be increased.

In the method for manufacturing a pulley according to the second aspect of the invention, since the flange tip pressing portion is provided on the roller die side, the first and second tapered forming groove portions are provided on the first and second clamper sides. There is no need to install these
The structure on the second clamper side can be simplified.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an example of a pulley base used in the present invention.

FIG. 2 is a vertical cross-sectional view showing an example of a pulley formed by the method of the present embodiment using the pulley base body shown in FIG.

3 is a longitudinal sectional view showing an example of a pulley in which a V groove is further formed on the pulley shown in FIG.

FIG. 4 is a vertical cross-sectional view showing the state at the start of forming the belt hooking portion in the first embodiment of the method for manufacturing a pulley according to the present invention.

FIG. 5 is a vertical cross-sectional view showing a state after completion of molding of the belt hooking portion in the first embodiment of the method for manufacturing a pulley according to the present invention.

FIG. 6 is a vertical cross-sectional view showing a state in which V-groove processing is performed on the belt hooking portion in the first embodiment of the method for manufacturing a pulley according to the present invention.

FIG. 7 is a vertical cross-sectional view showing a state at the start of forming the belt hooking portion in the second embodiment of the pulley manufacturing method according to the present invention.

FIG. 8 is a vertical cross-sectional view showing a state at the time of completion of molding of the belt hook portion in the second embodiment of the method for manufacturing a pulley according to the present invention.

FIG. 9 is a vertical cross-sectional view showing a state in which V-groove processing is performed on the belt hooking portion in the second embodiment of the pulley manufacturing method according to the present invention.

[Explanation of symbols]

 1 Cylindrical part 1A Belt hanging part 2 Bottom plate part 2A Support part 3 Pulley base 4 Hole 5 Cylindrical protrusion 6 First tapered molding groove 6A Flange tip pressing part 7 Tapered molding concave surface 8 First clamper 9 Tapered Forming convex surface 10 Second tapered forming groove portion 10A Flange portion tip pressing portion 11 Second clamper 12 Positioning protrusion 13 Positioning hole 14 Roller die 14A Belt hook forming convex portion 14B Flange portion tip pressing portion 15 Corner portion 16, 17 Flange Part 18 Pulley 19 V mountain 20 Roller die 20A Flange tip pressing part 21 V groove 22 Gap 23 First taper molding part

Claims (2)

[Claims] 1. A bottomed cylindrical body made of a drawn product of a metal plate in which one end of the cylindrical portion is closed by a bottom plate portion, and the outer peripheral surface of the cylindrical portion serves as a belt hanging portion molding surface, and the bottom plate portion. As a supporting portion, and the pulley base has a cylindrical protrusion having a diameter smaller than the inner diameter of the cylindrical portion and shorter than the cylindrical portion, and is abutted against the opening end of the cylindrical portion at the base of the cylindrical protrusion. A first clamper having a first taper-shaped groove formed in contact therewith and spreading it in the centrifugal direction, and a taper-shaped concave surface formed at the tip of the columnar protrusion; The outer surface is the first
Taper forming convex surface for pressing the tapered forming concave surface of the clamper to form the bottom plate portion as the taper concave supporting portion and the second taper forming groove portion forming the outer peripheral portion of the bottom plate portion in a tapered shape And the cylindrical portion is rotated while being compressed in the axial direction, and the outer peripheral portion of the belt die for forming the belt engaging portion is protruded. While pressing the outer peripheral surface of the cylindrical portion to reduce the diameter of this portion by moving the roller die in the axial direction of the cylindrical portion with the compression by the first and second clampers, The opening end of the opening portion of the cylindrical portion is expanded by the first tapered forming groove portion of the first clamper and the bottom is formed while forming a concave belt hooking portion in the substantially central portion of the cylindrical portion. Section and the cylindrical portion are crushed by the roller die that moves in the axial direction of the cylindrical portion and the second tapered molding groove portion of the second clamper, and flange portions are formed on both sides of the cylindrical portion. A method of manufacturing a pulley, wherein the tip is formed by pressing the tip with a flange tip pressing portion of the first and second tapered molding groove portions. 2. A bottomed cylindrical body made of a drawn product of a metal plate in which one end of the cylindrical section is closed by a bottom plate section, and the outer peripheral surface of the cylindrical section is used as a belt hook molding surface, and the bottom plate section is formed. As a supporting portion, and the pulley base has a cylindrical protrusion having a diameter smaller than the inner diameter of the cylindrical portion and shorter than the cylindrical portion, and is abutted against the opening end of the cylindrical portion at the base of the cylindrical protrusion. A first clamper having a first taper-shaped forming portion that is in contact with and spreads out in the centrifugal direction, and a taper-forming concave surface is formed at the tip of the cylindrical protruding portion; and the first clamper is brought into contact with the outer surface of the bottom plate portion. The cylindrical portion is clamped by a second clamper having a tapered molding convex surface that presses the outer surface against the tapered molding concave surface of the first clamper to mold the bottom plate portion as the tapered concave support portion. The axis While rotating while compressing in the same direction, the outer peripheral part of the roller die has a convex part for forming a belt engaging part, and the convex part for forming a belt engaging part of a roller die having a flange tip pressing part on both side surfaces is formed on the outer peripheral surface of the cylindrical part. The roller die is pressed in the substantially central portion of the cylindrical portion to reduce the diameter of this portion, and the roller die is moved in the axial direction of the cylindrical portion by the compression by the first and second clampers. A corner formed by the bottom plate portion and the cylindrical portion while expanding the opening end of the opening portion of the cylindrical portion by the first tapered molding portion of the first clamper while forming a concave belt hooking portion on the portion. Portion is crushed by the roller die that moves in the axial direction of the cylindrical portion and the tapered molding convex surface of the second clamper, and flange portions are provided on both sides of the cylindrical portion, and the tips of the flange portions are pushed by the tip portion of the flange portion. Method of manufacturing a pulley and forming while pressing in parts.