JP3399890B2 - Rolling forming device for different diameter ring - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling molding suitable for forging a ring having a different diameter, such as an inner case or an outer case of a tapered bearing, having a different inner diameter and / or outer diameter such as a tapered shape. Regarding the device.

[0002]

2. Description of the Related Art By the way, a molding device for a ring having the same inner diameter and outer diameter parallel to the axis has already been developed (Japanese Patent Laid-Open No. 10-24338). As shown in FIG. 11 and FIG. 12, such a conventional forming apparatus is arranged so that the forming roller 35 faces the ring forming portion 33 of the mandrel 32.
Is provided, and pressure rollers 36, 36 are provided so as to face the rolling portion 34 of the mandrel 32. The mandrel 32 is for pressing the ring W to be processed inserted in the ring forming part 33 in a state of being pressed by the forming roller 35 while being pressed by the pressure roller 36 that has moved relatively. is there.

In the forging process for the workpiece W,
As shown in FIG. 11, the mandrel 32, the forming roller 35
The pressure roller 36 and the pressure roller 36 are both rotated about an axis. At this time, the mandrel 32 and the forming roller 3 are rotated.
In addition to rotating in a direction different from 5, the workpiece W is also rolled by the mandrel 32 and the forming roller 35, and therefore rolls in the same direction as the rotating direction of the mandrel 32. In this case, since the diameters of the mandrel 32 and the ring member W to be processed are different, and the positions of the rotational axes of the mandrel 32 and the ring member W to be processed do not match, a difference occurs in the peripheral speed between the mandrel 32 and the ring member W to be processed. ing. When this conventional device is used as a device for obtaining a ring of the same diameter, the workpiece ring W is pressed in the ring forming part 33 with almost no inclination, so that the mandrel 32 and the workpiece ring W described above are pressed. Even if there is a difference in the peripheral speed between and, no trouble will occur.

[0004]

However, in the case of forging a different-diameter ring body as a product, since the portion to be formed of the ring body W to be processed has a tapered different diameter,
In the forging process, as shown in FIG. 12, the axis of the workpiece W is inevitably tilted.
When the workpiece W is tilted in this way, the workpiece W is inclined.
As is rolled to a larger diameter, it comes into contact with the rolling portion 34 of the mandrel 32 and the inner side surface portion of the pressure roller 36. When the workpiece W is brought into contact with each other in this way, the peripheral velocity between the mandrel 32 and the workpiece W is different as described above, and therefore excessive friction heat is generated at the contact portion T thereof. However, there is a drawback in that a pressed product in a normal state cannot be obtained. Such a drawback similarly occurs when forming a different-diameter ring body in which the outer peripheral surface of the workpiece ring body is tapered.

Due to the drawback of causing such obstacles, the rolling forming device for a ring of the same diameter cannot be used for press forming of a ring of a different diameter. Therefore, as a conventional general method for forming a ring of different diameter,
Obtaining an intermediate processed ring body formed by hot pressing,
Next, cutting the different diameter part to this intermediate processed wheel,
Further, the forming process of the different-diameter ring body is performed by the process of undergoing the shaping process.

In such a conventional molding method for a different-diameter ring body, since it is necessary to go through the multi-steps as described above,
In addition to lacking speed and economy of processing, it is difficult to obtain a product ring that always maintains a certain level of accuracy due to differences in processing accuracy during the cutting process and shaping process. The generation of shavings in the shaping process consumes more molding material, which is also uneconomical.

Therefore, in the present invention, the disadvantages of the above-described conventional forming apparatus are eliminated, and the disadvantage that the shavings are generated from the different diameter ring body quickly with a smaller number of steps, always with a constant accuracy, and the like. It is an object of the present invention to provide a rolling forming device for a ring having a different diameter and capable of cold working which can be obtained more economically.

[0008]

In order to achieve the above-mentioned object, a rolling forming apparatus for a different-diameter ring body according to the present invention has a ring forming portion formed on a central peripheral surface and both sides of the ring forming portion. And a mandrel provided with rotating discs, respectively, and a mandrel provided so that the mandrel can be relatively moved and pressed against the outer peripheral surface of the ring-shaped workpiece to be inserted into the ring-shaped portion of the mandrel. A rolling forming apparatus comprising a forming roller and a pressure roller provided so as to be capable of moving relative to the peripheral surface of the rotating disk of the mandrel so as to be in pressure contact with the peripheral surface of the rotating disk. A synchronous plate is rotatably arranged concentrically on at least one of the inward faces, and the ring molding part of the mandrel and / or the peripheral surface of the molding roller is formed to have a different diameter. Or /
And, by the rotational drive of the forming roller, the ring to be processed is sandwiched between the ring forming part of the mandrel and the forming roller in a state where the pressure roller is pressed against the peripheral surface of the rotating disk. In the molding process of rolling molding under pressure,
When the workpiece wheel is tilted and the expanded portion of the workpiece wheel comes into contact with the synchronizing plate, the synchronizing plate rolls as the workpiece wheel rolls. Characterize.

In the rolling forming apparatus for a different-diameter wheel body according to the present invention, the relative movement between the wheel body forming portion of the mandrel and the forming roller and between the rotating disk of the mandrel and the pressure roller is performed. Means, for example, that the forming roller and the pressure roller move and approach the mandrel in the fixed position, or the forming roller is provided in the fixed position and the mandrel and the pressure roller move and approach the mandrel. You can

Due to the relative movement between the mandrel and the forming roller, the forming roller comes into a state of being pressed against the outer peripheral surface of the ring body to be processed inserted in the ring forming portion. Further, the relative movement between the mandrel and the pressure roller causes the pressure roller and the rotating disc to come into pressure contact with each other. The pressing force of the pressure roller at the time of this pressure contact can oppose the pressure contact force of the forming roller described above, whereby the ring forming part of the mandrel is always maintained in a fixed position, and the ring forming part It is possible to perform the forging in a state in which the to-be-processed wheel body is stably pinched with the roller. This forging process is performed by rotationally driving the mandrel or forming roller.

In other words, due to the rotational driving force of the mandrel or forming roller, for example, when the ring forming part of the mandrel has a different diameter, the inner diameter of the ring part of the ring to be processed is gradually rolled in a state of being successively rolled. If the outer peripheral surface of the forming roller has a different diameter, the outer diameter of the forming roller is forged to a ring having a different diameter. In addition, when both the ring forming portion of the mandrel and the outer peripheral surface of the forming roller have different diameters, the inner and outer diameters of the ring are forged to different diameters.

Further, in the forging process, the ring to be machined is rolled in a state in which its diameter gradually expands, and at the same time, the shaft center is inclined so that the expanded part corresponds to both inward facing surfaces of the rotating disk. In this state, the extension portion comes into contact with the synchronizing plate. When the wheel to be machined and the synchronizing plate are brought into contact with each other at this expanded portion, there is a difference in the peripheral speed between the mandrel and the wheel to be processed as described above. It will rotate in synchronization with the moving speed. In this case, the peripheral speed of rotation of the synchronizing plate relatively rotates in accordance with the difference from the peripheral speed of rotation of the rotating disc, whereby the workpiece wheel and the rotating disc are rotated. Obstacles caused by contact with can be avoided.

Therefore, in the rolling forming apparatus for a different-diameter wheel body according to the present invention, the inner and outer diameters of the different-diameter wheel body formed corresponding to the different diameter shape of the ring body forming portion of the mandrel or / the peripheral surface of the forming roller. In addition to the tapered shape, the different-diameter shape includes a variety of shapes that cause the above-mentioned obstacles, such as a step shape with a large or small diameter.

The synchronizing plate exhibiting such an action rotates concentrically along the inward surface side of the corresponding rotating disc with respect to the rotating disc, for example, via a thrust bearing. The configuration can be freely provided. Further, the size of the synchronizing plate needs to be such that it can cover the position where the expanded portion of the workpiece wheel contacts. As described above, it suffices that the synchronizing plate is provided on either one of the rotating discs, but it is preferable that the synchronizing plate is provided on each of the rotating discs so as to sufficiently deal with the obstacle that may occur during the forging process.

Further, in the rolling forming apparatus for a different-diameter ring body of the present invention, the support roller at the end faces the ring body forming section of the mandrel and is displaced in the open / closed state as the forming roller moves. Two pairs of clamp arms are provided, and each clamp arm is closed when the workpiece ring is in a pinching state between the ring forming part of the mandrel and the peripheral surface of the forming roller. In this state, each of the support rollers supports the opposing outer peripheral surface of the ring-shaped body in a rolling state.

According to the above-mentioned structure of the present invention, the workpiece wheel can be always supported at a fixed position during the forging process, and the support at this time is supported by the support roller, so that the workpiece wheel is supported. It does not interfere with the rolling condition of. Therefore, it is possible to minimize the influence of the tilt that occurs on the ring to be processed, and it is possible to obtain a product different diameter ring whose processing accuracy is always stable.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings. The rolling forming apparatus 1 for a different-diameter ring body shown in FIG. 1 has a different-diameter ring body forming section 2a formed by tapering the ring-shape forming section on the central peripheral surface, and the different-diameter ring body forming section 2a is formed. Rotating disks 3 and 5 are provided on both sides,
Synchronous plates 4 and 6 are concentrically provided on the inward surfaces of the rotating disks 3 and 5, respectively, and the mandrel 2 is rotatably arranged. A forming roller 13 provided so that the processed wheel W can be relatively moved and pressed against the mandrel 2.
And pressure rollers 19 and 19 provided so as to move relative to the circumferential surfaces of the rotating discs 3 and 5 of the mandrel 2 so as to be in pressure contact therewith.

Further, the main body of the mandrel 2 has a different-diameter ring molding portion 2a forming a central peripheral surface and a support shaft portion 2b on one end side.
And a support shaft end 2c on the other end side. Different-diameter ring forming part 2
A has a truncated cone-shaped tapered surface corresponding to the different diameter portion Wb formed on the inner surface of the workpiece W.

Further, as shown in FIG. 2, the rotary disc 3 has a shape in which the cylindrical shaft portion 3a is protruded toward the inward surface side at the rotational axis position, and the cylindrical portion 3a has an outer peripheral portion. The synchronizing plate 4 is provided concentrically with the bearing 7 on the inward side of the rotating disc 3. Further, a thrust bearing 8 is provided between the synchronizing plate 4 and the surface of the rotating disc 3, so that the synchronizing plate 4 is rotatable along the surface of the rotating disc 3. Further, this configuration is the same as the configuration between the rotary disc 5 and the synchronizing plate 6. Further, a key groove 3b is formed on the inner surface of the cylindrical shaft portion 3a along the axis of rotation, and the protrusion 2d provided on the side peripheral surface of the support shaft portion 2b is formed in the key groove 3b.
Are fitted. Although not shown, the spindle end 2c
The ridges 2e on the side surface of are fitted into the key grooves formed on the surface of the corresponding fitting recess 5a. With these fitting configurations, the different-diameter wheel body molding portion 2a and the rotating disks 3 and 5 are integrally rotated as the mandrel 2.

A drive shaft 9 is provided on the outer surface of the rotary disc 3.
Is fixed via a bearing 10, and a drive shaft 11 is fixed to the outer surface of the rotary disc 5 via a bearing 12. Therefore, the rotational driving force of the drive shafts 9 and 11 causes the different-diameter wheel body molding portion 2a of the mandrel 2 and the rotating disks 3 and 5 to integrally rotate. In addition, the mandrel 2 is provided with the drive device for the drive shafts 9 and 11 and the molding device 1 as well.
It is arranged in a fixed position on the base frame of. Further, together with the drive shaft 9, as shown in FIG. 3, the support shaft end 2c is controlled so as to move in the front-rear direction along the axis of the fitting recess 5a so as to be fitted into and removed from the fitting recess 5a.

The forming roller 13 is rotatably supported by a movable frame 15 via a support shaft 14. The movable frame 15 is controlled to move in the left-right direction by driving the piston shaft 17 of the hydraulic cylinder 16. This movable frame 1
The movement of 5 is along a plurality of guide shafts 18 provided in parallel on a base frame (not shown) of the molding apparatus 1 supporting the movable frame 15. By the movement of the movable frame 15 to the left, the forming roller 13 is brought into a state of being pressed against the to-be-processed wheel body W inserted in the different-diameter wheel body forming portion 2a.

A movable frame 22 is supported on the guide shafts 18 and pressure rollers 19, 19 are rotatably provided on the movable frame 22 via a support shaft 21. Reference numeral 20 is a mounting plate for the pressure roller 19. Movable frame 2
2 is controlled to move in the left-right direction along the guide shafts 18 by driving the piston shaft 24 of the hydraulic cylinder 23. By moving the movable frame 22 to the right, the pressure rollers 19 are brought into a state of being in pressure contact with the rotating discs 3 and 5.

Next, the functional operation of the molding apparatus 1 will be described. First, as shown in FIG. 3, the mandrel 2
At the time when the forming roller 13 and the pressure rollers 19, 19 are separated from each other with respect to the mandrel 2
The main body retracts, and the support shaft end 2c is detached from the fitting recess 5a. In this state, the to-be-processed wheel body W sent to the front position of the shaft center of the spindle end 2c has the inner peripheral surface W thereof.
It is coordinated with a facing each other.

Next, as shown in FIG. 4, the mandrel 2
When the main body is moved forward along the axis thereof, the main body of the mandrel 2 is inserted into the inner peripheral surface Wa of the workpiece W. Next, when the support shaft end 2c is moved further forward and fitted in the fitting recess 5a, the workpiece wheel W is positioned in the different-diameter wheel molding portion 2a. Next, the drive shaft 9 is rotationally driven, and further, the molding roller 13 is moved to the mandrel 2 side and pressed against the workpiece W, and substantially at the same time, the peripheral surface portion of each pressure roller 19 rotates. 5 is in contact with the peripheral surface portions of No. 5 and further in pressure contact.

The initial ring shape of the ring W to be processed is such that the wall portion has a substantially uniform wall thickness. Therefore, the forming roller 1
When pressed by 3, the inner peripheral surface Wa of the workpiece W is strongly pressed against the different-diameter ring body molding portion 2a. At this time, the inner-diameter surface Wa has a different-diameter ring body molding portion 2a. Although it is strongly pressed on the side facing the large diameter portion, a gap S exists on the side facing the small diameter portion. As a result, as shown in FIG. 4, the to-be-processed wheel body W is in a state of being inclined toward the large-diameter portion side of the different-diameter wheel molding portion 2a, that is, the rotating disc 3 side.

Further, the forming roller 13 is rotated around the support shaft 14 via the processed wheel body W which is in pressure contact with the different-diameter wheel body forming portion 2a which is being rotated by the rotational drive of the drive shaft 9. . Further, this rotational driving force is applied to the rotating discs 3 and 5 that rotate integrally.
The rotation driving force of the rotating disks 3, 5 is brought into a pressure contact state to rotate the pressure rollers 19, 19. At this time, as shown in FIG. 5, with respect to the rotational direction a of the different-diameter wheel body molding portion 2a, the rotational disc 5 rotates in the same direction c as the rotational direction a, and the molding roller 13 and Each pressure roller 1
9 rotates in the opposite directions, i.e., the two directions, and the two directions. At this time, the workpiece wheel W rolls in the same E direction as the rotation direction a of the different diameter wheel molding portion 2a, but the circumference of the workpiece wheel W and the different diameter wheel molding portion 2a. Due to the difference in speed, the synchronizing plate 4 rotates relative to the rotating disc 3 by contact with the workpiece W.

In this way, the inner peripheral surface Wa of the ring-shaped workpiece W is pressed against the surface of the different-diameter ring molding portion 2a by the pressure contact force of the forming roller 13 and is pressed into a desired different-diameter ring. . In this case, each pressure roller 19 produces a pressing force corresponding to the pressure contact force of the forming roller 13 at the facing position so that the mandrel 2 is always in a fixed position.

In this forging process, as shown in FIG. 6, when the processing of the different-diameter portion Wb with respect to the workpiece W progresses, the workpiece W is further tilted toward the rotating disc 3. In addition, since the to-be-processed wheel body W is rolled and the inner and outer diameters of the wheel body are gradually increased, a contact portion T is generated between the expanded portion and the surface of the synchronizing plate 4. Due to the occurrence of the contact portion T between the workpiece wheel W and the synchronizing plate 4, the synchronizing plate 4 rotates in the F direction, which is the same direction as the rotating direction c of the rotating disc 3. In this case, the peripheral speed of the synchronizing plate 4 is synchronized with the peripheral speed of the workpiece W, and as described above, there is a difference in the diameter larger than that of the different-diameter ring forming portion 2a,
The rotation of the rotating disk 3 is delayed, and the synchronizing plate 4 rotates at a lower speed with respect to the rotating disk 3. As a result, a collision part T is formed between the workpiece wheel W and the rotating disk 3.
It is possible to prevent the occurrence of failure due to.

At the final stage of the forging process for the workpiece W, as shown in FIG. 7, most of the inner peripheral surface of the workpiece W is machined as the different diameter portion Wb, so that the workpiece W is gradually processed. The inclined state of the processed wheel body W is eliminated, and the processed wheel body W is displaced so as to be in the normal position with respect to the different-diameter wheel body molding portion 2a. Through such a process, the to-be-processed wheel body W is press-formed at once to a product different-diameter wheel body.

Next, a second embodiment of the rolling forming apparatus for different-diameter ring bodies according to the present invention will be described. In the rolling forming apparatus for a different-diameter ring body according to this embodiment, as shown in FIG. 8, the forming apparatus 1 is further provided with an end portion facing the different-diameter ring body forming section 2a of the mandrel 2. Two pairs of clamp arms 2 are provided so that the support roller 26 included therein is displaced in the open / closed state as the forming roller 13 moves.
5 and 25 are provided respectively.

In this case, the meshing gears 27, 27 are provided at the ends of the clamp arms 25, 25, respectively, and the meshing gears 27, 27 are pivotally supported on the bearing base 28 in a state of meshing with each other. Has been done. This bearing base 28
Each clamp arm 25 is opened and closed by being moved in the left-right direction by the piston shaft 29 in accordance with the movable frame 15 (see FIG. 1). Furthermore, each clamp arm 25
Are provided with connecting rods 30, one end of which is connected to the middle position and the other end of which is connected to a piston shaft 31, and these piston shafts 31 are driven in the left-right direction according to the bearing base 28. Each clamp arm 2
It assists the opening / closing operation of item 5.

In this forming apparatus, when the workpiece W is in a state of being pinched between the different-diameter ring forming portion 2a of the mandrel 2 and the forming roller 13, each clamp arm 25 is closed. In the state where the respective support rollers 26 roll, the opposing outer peripheral surface portions of the workpiece W are supported from above and below. This support roller 2
By the support of 6, 26, while working during the forging process, the inner peripheral surface Wa of the ring-shaped workpiece W is maintained so as to be constantly pressed against the surface of the different-diameter ring-shaped portion 2a in a stable state. It is possible to prevent the workpiece W from inclining to an unnecessary position.

Next, a third embodiment of the rolling forming apparatus for different-diameter ring bodies according to the present invention will be described. As shown in FIG. 9, the rolling forming device 1A for a different-diameter ring body according to the present invention is different from the rolling forming device 1 for a different-diameter ring body described above in that the outer peripheral surface of the ring forming part of the mandrel 2A is The molding roller 13A has a ring molding part 2Aa having the same diameter, and a molding roller 13A having a different-diameter ring molding part 13Aa having a tapered outer peripheral surface. It should be noted that the configuration other than these components is the same as that of the rolling forming device 1 for a different-diameter ring body, including the functions thereof.

In the rolling forming apparatus 1A for the different-diameter ring body, the work-body W is sandwiched between the ring-forming section 2Aa of the mandrel 2A and the different-diameter ring forming section 13Aa of the forming roller 13A. Although it is forged, in the forging process, as shown in FIG. 10, the axis of the workpiece W is tilted, and the expanded portion of the workpiece W with the tilted axis is the rotating disc. The contact state T is set at a peripheral speed different from that of No. 3. At this time, as in the case of the rolling forming apparatus 1 described above, the synchronous plate 4 rotates in synchronization with the rolling speed of the workpiece wheel W, whereby the workpiece wheel W and the rotary disk 3 are rotated. The effect of avoiding the obstacle caused by the contact of is exhibited.

As a result of the forging process as described above, the workpiece wheel W has a different diameter portion Wb on its entire outer peripheral surface as shown in FIG.
Is formed. In addition, such a different diameter portion Wb
At the stage of forming, the tilted state of the axis of the ring body W to be processed is eliminated, and the ring body W is displaced so as to be in a normal position with respect to the ring body molding portion 2Aa. Through such a process, the to-be-processed wheel body W is press-formed at once to a product different-diameter wheel body. The second embodiment described above can also be adopted in the rolling forming apparatus 1A for the different-diameter wheel body.

[0036]

Since the present invention is constructed as described above, the following effects are exhibited. First, a rolling forming apparatus for a different-diameter ring body according to the present invention includes a mandrel in which a ring body forming portion is formed on a central peripheral surface and rotating discs are provided on both sides of the ring body forming portion, and the mandrel. A forming roller provided so as to be relatively movable and press-contacted to an outer peripheral surface of a work-piece wheel body inserted through the ring-body forming portion, and a peripheral surface of a rotating disc of the mandrel. In a rolling molding device comprising a pressure roller provided so as to be relatively movable and pressed against each other, a synchronizing plate is rotatable concentrically with an inward surface of at least one of the rotating disks. And the peripheral surface of the mandrel and / or the molding roller is formed as a different-diameter wheel molding part having a tapered surface, and the mandrel and / or the molding roller rotates. By driving, In the molding process in which the roller is pressed against the peripheral surface of the rotating disk, the ring to be processed is roll-molded in a pinching state between the ring forming part of the mandrel and the forming roller. When the processing wheel body is tilted and the expanded portion of the workpiece wheel body contacts the synchronizing plate, the synchronizing plate rolls along with the rolling of the workpiece wheel body, In the forging process, it is possible to avoid obstacles caused by tilting of the to-be-processed wheel body on the mandrel, and thus it is possible to perform cold forging at once to a wheel body having different inner diameters and / or outer diameters. It has become possible.

As described above, according to the rolling forming apparatus for a different-diameter ring body of the present invention, the ring body to be processed can be formed into a ring body having different inner and outer diameters by a single molding process. Promptly and always as a processed product of constant accuracy, and
Unlike the conventional molding apparatus, shavings are not generated, and a loss of material is not generated, so that a ring having a different diameter can be economically obtained.

Further, two pairs of clamp arms are provided so as to oppose the ring forming portion of the mandrel so that a support roller rotatably provided at an end thereof is displaced in an open / closed state as the forming roller moves. When the workpiece ring is in a state of being clamped between the ring forming part of the mandrel and the peripheral surface of the forming roller, the support rollers are rotated while the clamp arms are closed. In the case of the configuration in which the outer surface portions of the to-be-processed wheel body that face each other are supported in the dynamic state, the to-be-processed wheel body to be forged is always formed with respect to the different-diameter wheel body forming section or wheel body forming section of the mandrel. It is possible to support it so that it is in a normal position, and it is possible to further reduce the amount of tilt that occurs in the ring to be machined, which makes it possible to obtain a highly accurate ring with a different diameter in a more stable state. .

[Brief description of drawings]

FIG. 1 is a partial cross-sectional plan view of a main part of a rolling molding apparatus for a ring of different diameters according to the present invention.

FIG. 2 is a vertical cross-sectional front view for explaining the configurations of a rotary disc and a synchronizing plate in the above molding apparatus.

FIG. 3 is a partial plan view illustrating a state of a mandrel and the like before starting the forging process by the above molding apparatus.

FIG. 4 is a partial cross-sectional partial plan view for explaining the state of the mandrel and the like immediately after the start of the forging process by the above molding apparatus.

FIG. 5 is a vertical cross-sectional view illustrating a state of a mandrel and the like during a forging process by the above molding apparatus.

FIG. 6 is a partial horizontal cross-sectional partial plan view for explaining the state of the mandrel and the like during the forging process by the above molding apparatus.

FIG. 7 is a partial cross-sectional partial plan view for explaining the state of the mandrel and the like immediately before the end of the forging process by the molding apparatus of the above.

FIG. 8 is a partial cross-sectional plan view of a main part of a rolling device for a second different-diameter ring body according to the present invention.

FIG. 9 is a partial cross-sectional plan view of a main part of a rolling molding device for a third different-diameter ring body according to the present invention.

FIG. 10 is a partial cross-sectional partial plan view for explaining the state of the mandrel and the like immediately before the completion of the forging process by the molding apparatus of the above.

FIG. 11 is a vertical cross-sectional front view of the main part of the device for explaining the forging process by the conventional device.

FIG. 12 is a plan view of the main part of the device for explaining the forging process by the conventional device.

[Explanation of symbols]

1,1A Rolling forming device for different diameter wheels 2 2A mandrel 2a Different diameter wheel forming part 2Aa Ring forming part 3, 5 rotating disk 4, 6 Synchronous plate 9, 11 Drive shaft 13, 13A forming roller 13Aa Different Diameter Ring Molding Part 19 Pressure roller 25 clamp arm 26 Support rollers 27 mesh gears W Worked wheel Wa inner surface Wb Different diameter surface

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-9-57383 (JP, A) JP-A-1-313122 (JP, A) JP-A-62-176627 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) B21H 1/06 B21H 1/12

Claims (2)

(57) [Claims] 1. A mandrel having a ring molding part formed on a central peripheral surface thereof and rotating disks provided on both sides of the ring molding part, and the mandrel being inserted into the ring molding part. And a forming roller provided so as to relatively move and press against the outer peripheral surface of the workpiece wheel, and relatively move and press contact with the peripheral surface of the rotating disk of the mandrel. In a rolling forming device comprising a pressure roller provided so that a synchronous plate is concentrically rotatably disposed on the inward surface of at least one of the rotating discs and the mandrel A ring molding part or / and the peripheral surface of the molding roller is formed as a tapered ring-shaped different diameter ring molding part, and the pressure roller is rotated by the rotational driving of the mandrel and / or the molding roller. Pressure contact with the peripheral surface of the moving disk In the molding process in which the ring to be processed is roll-formed in a state of being clamped between the ring forming part of the mandrel and the forming roller, the ring to be processed is inclined and the ring to be processed is inclined. A rolling forming device for a different-diameter ring body, wherein the synchronous plate rolls as the ring member to be processed rolls when the expanded portion comes into contact with the synchronization plate. 2. A pair of clamp arms are provided so as to oppose the ring forming portion of the mandrel so that a support roller rotatably provided at an end of the mandrel can be opened and closed as the forming roller moves. When the workpiece wheel is in a state of being clamped between the different-diameter wheel forming part of the mandrel and the forming roller, each of the support rollers rolls with each clamp arm closed. The rolling forming device for a different-diameter wheel body according to claim 1, wherein a corresponding outer peripheral surface portion of the wheel body to be processed is supported in a dynamic state.