JPH0236341B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flatness correction device for a disk-shaped plate that requires flatness, such as a hub mounting surface of a wheel.

[Conventional technology]

A vehicle wheel is attached to a hub at its hub attachment surface with bolts. Since the wheel must be mounted closely to the hub, it must be flat by minimizing waviness in the circumferential direction. In addition, the inner circumference of the hub mounting surface is slightly bent in the axial direction relative to the outer circumference (so-called dateshing), which generates a spring force when a bolt is tightened to the hub to prevent the bolt from loosening. It is designed not to occur.

To remove such undulations or to process dateshing if dateshing is required,
Conventionally, wheels have had their hub attachment portions pressed between upper and lower press dies.

[Problem that the invention seeks to solve]

However, when straightening the hub mounting surface using a press, the disks are pressed from above and below, so the flesh of the hub mounting surface cannot escape in the circumferential direction, making it difficult to straighten the hub mounting surface.
A large pressing force of about 1200 tons was required, and even in that case, waviness of about 0.5 mm remained. To make this undulation even smaller,
It is necessary to press with such a large force that the thickness of the hub itself changes, but with the method of squeezing between the upper and lower discs as described above, it is difficult for the hub meat to escape in the radial direction, so the pressing force is not considered to be costly. Even if it were increased, there was a practical limit.

Although this is not an example applied to correcting the wheel hub mounting surface, it is an example of normal disc correction.
Some of these are disclosed in Japanese Patent Application Laid-open No. 27684 and Japanese Patent Application Laid-open No. 195535/1983. This involves placing conical rolls above and below a disk so that the upper and lower rollers alternate in the circumferential direction, and rotating the disk to alternately create compression and tension bending deformations on the disk to remove undulations. It is. Therefore, the technical idea used for disk straightening using such a device is to forcibly deform the plate vertically and plastically alternately, which is essentially different from the one-way straightening of the present invention, which will be described later. Moreover, applying a technology that forces a large amount of plastic deformation of a disc vertically to the correction of a wheel that has a curved high-rigidity part around the hub mounting surface has a negative impact on the high-rigidity part and the rim part. Since it gives
Almost impossible.

The present invention eliminates waviness on the hub mounting surface of a disc-shaped plate that requires flatness, such as a wheel hub.
It is an object of the present invention to provide a flatness correction device that can perform correction with high precision without requiring a large pressing force as in the past.

[Means for solving problems]

The disk-shaped plate flatness correction device of the present invention for achieving the above object comprises the following device. That is, a rotatable disk, which is arranged at intervals in the circumferential direction of the disk and is provided so as to be able to approach/leave the disk relatively in the axial direction of the disk, and the disk a plurality of rotatable straightening rolls each having a conical surface that pinches the disc-like plate in the plate thickness direction between the opposing disc portions when relatively approached; A disk-shaped disc-shaped disk comprising: a back-up roll supported from the side; a rotational drive means for rotating at least one of the straightening roll and the disc; and an advancing/retracting drive means for moving the disc and the straightening roll relatively toward and away from each other. Plate flatness correction device.

[Effect]

In the above-mentioned device of the present invention, a portion of the disk-like plate where flatness is to be achieved, such as a hub attachment portion of a wheel, is disposed between the straightening roll and the disc, and the hub is pressed against the disc by the straightening roll. At the same time, the disc is rotated around the axis to correct the undulations of the disc-shaped plate, and if the disc-shaped plate is a wheel, the undulation of the hub mounting surface. When the disc-shaped plate is a wheel and the hub needs to be dated, the disc and the straightening roll are given a dating shape, and the hub is deformed during waviness correction to apply the dating to the hub.

Since straightening is performed using a rotating disk and straightening roll instead of pressing with a conventional press, deformation of the disk-shaped plate can easily occur in the circumferential direction.
The stress required for straightening can be reduced to less than 100 TON (actually about 50 TON), which reduces the cost of the device and enables high-precision straightening, for example, 0.1 mm or less.

In addition, when the disc-shaped plate is a wheel disc, the correction of the hub mounting surface is a deformation due to unidirectional pushing force, and the deformation is not large enough to cause vertical deformation amplitude, so there is no adverse effect on the wheel rim etc. I can avoid it.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the flatness correction device for a disk-shaped plate according to the present invention will be described below with reference to the drawings, taking a wheel as an example of the disk-shaped plate.

FIG. 1 shows a first embodiment of the invention. In the figure, numeral 10 indicates large and medium-sized wheels for trucks and buses whose hub mounting surfaces are processed. The wheel 10 is placed on a rotatable disk 12 with its hub attachment portion 14 abutting it. The disc 12 has a flat surface 16 in the circumferential direction, and a portion corresponding to the inner periphery of the wheel hub mounting portion 14 is provided with a deicing shape if dedicating is required. However, the deicing portion also has a uniform surface in the circumferential direction.

At least three straightening rolls 18 are disposed on the side of the disc 12 on which the wheel hub mounting portion 14 is placed in contact with each other.
is arranged so as to be movable forward and backward relative to the disc 12.
The straightening rolls 18 are preferably arranged at equal intervals in the circumferential direction of the disk 12. The straightening roll 18 is composed of a roll having a truncated conical surface, and is arranged such that the small diameter side cross section of the conical surface is located on the inner peripheral side of the disk 12. The straightening roll 18 is attached to the wheel hub attachment part 1
4 in cooperation with the disc 12, and serves as a driven wheel that rotates as the disc 12 is forcibly rotated. However, if the straightening roll 18 is forcibly rotated, the disc 12
may be used as a driven wheel.

A rotatable back-up roll 20 is arranged on the opposite side of the straightening roll 18 from the disc 12, and pushes the straightening roll 18 in the direction of the disc 12. Straightening roll 18
The shaft portion 22 is supported via a self-aligning bearing 24 and is urged to rotate by a spring 26 in a direction where the conical surface of the straightening roll 18 is pressed against the back-up roll 20.

The rotating shaft 28 connected to the disk 12 is connected to the supporting shaft 30
A gear 36 is attached to the outer periphery of the rotating shaft 28. The gear 36 is meshed with a gear 40 connected to a hydraulic motor serving as a rotational drive means 38, and the disc 12 is forcibly rotated by the rotational drive means 38. However, the straightening roll 18 may be forced to rotate, and the disc 12 may be used as a driven wheel.

Backup roll 20 and straightening roll 18
is supported by a ram 42, and the shaft portion 30 is supported by a ram 48. One of the rams 42 and 48 is moved relatively forward and backward in a direction in which the straightening roll 18 and the disc 12 approach and separate from each other by a hydraulic cylinder serving as a forward/backward driving means 44, whereby the straightening roll 18 moves toward the hub mounting surface 14. is corrected in cooperation with the disc 12.
Note that 46 indicates a feeder for carrying wheels into and out of the straightening device.

In the first embodiment, the disc 12 is arranged below the hub mounting part 14 and the straightening roll 18 is arranged above the hub mounting part 14.

However, as shown in the second embodiment of FIG.
8 may be placed below the hub attachment portion 14. In the second embodiment, parts that are similar to those in the first embodiment are given the same reference numerals as those in the first embodiment, and explanations thereof will be omitted.

Next, the operation of the processing apparatus configured as described above will be explained.

First, the wheel 10 is carried into the processing device by the feeder 46, and the hub mounting portion 14 is placed on the disk 12 (first embodiment) or on the straightening roll 18 (second embodiment). Example) Set it as follows.

The distance between the straightening roll 18 and the disc 12 is shortened by driving the forward/backward driving means 44, and the hub mounting portion 14 is compressed between the straightening roll 18 and the disc 12. At this time, the straightening roll 18 is backed up by the back-up roll 20.

Subsequently, the rotational drive means 38 is driven to rotate the disk 12.
is forced to rotate. The wheel 10 rotates together with the disc 12. Although the position of the straightening roll 18 is fixed in the circumferential direction of the disk 12, since the disk 12 and wheel 10 rotate, it rolls relative to the disk 12 and wheel 10 in the circumferential direction. As a result, the undulations of the hub mounting surface 14 are corrected by the disk 12 and the correction roll 18.
When dateshing is required, dateshing is performed at the same time.

Since the number of correction rolls 18 is at least three in the circumferential direction of the disk 12, the wheel 10 does not partially lift off from the disk 12, and its posture is stabilized, allowing highly accurate undulation correction.

In addition, since the correction is performed using the correction roll 18, deformation of the hub mounting surface 14 can be avoided in the circumferential direction.
Deformation is easy and correction can be made with a small amount of pressing force. With a conventional press, a pressing force of 1,200 tons or more is required to correct within about 0.5 mm, as described above, but when using the correction roll 18,
High-precision correction of errors within 0.1 mm is possible with a pressing force of approximately 50 to 60 tons.

When the correction is completed, the rotational drive means 38 is stopped,
The advancing/retracting driving means 44 is driven in the opposite direction to the above-mentioned direction to separate the correction roll 18 from the disc 12, and the wheel 10 is removed from the processing apparatus.

〔Effect of the invention〕

As explained above, when using the disk-shaped plate flatness correction device according to the present invention, the following effects can be obtained.

B. Since the waviness of the disk-shaped plate, for example, the hub mounting surface, is corrected by the pinching force between the disk and the straightening roll, it is possible to correct the waviness with high precision using less pressing force compared to the conventional method using the pinching force between the disks. Compared to conventional straightening using straightening rolls arranged alternately in the circumferential direction, for example, it is possible to avoid undue deformation of the highly rigid part around the hub mounting surface of the wheel and distortion of the wheel. can.

(b) Since a plurality of straightening rolls are arranged in the circumferential direction of the disc, the disc-shaped plate does not partially float up from the disc in the circumferential direction during straightening, and stable and highly accurate straightening can be performed.

C. Also, since the disc-shaped plate can be compressed in the thickness direction between the straightening roll and the opposing disc part, it is possible to plastically deform the disc-shaped plate so that the thickness itself decreases, and through plastic hardening. , the hardness of the surface of the disc-shaped plate and the strength of the disc-shaped plate itself are improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a flatness correction device for a disk-shaped plate according to a first embodiment of the present invention, and FIG. 2 is a sectional view of a flatness correction device for a disk-shaped plate according to a second embodiment of the present invention. It is. DESCRIPTION OF SYMBOLS 10... Disc-shaped plate, for example, hub attachment part of a wheel, 12... Disk, 14... Hub attachment surface, 16... Circumferentially flat surface, 18... Straightening roll, 20... Backup roll, 38... Rotation drive means, 44... Advance/retreat drive means.

Claims (1)

[Scope of Claims] 1. A rotatable disk, which is arranged at intervals in the circumferential direction of the disk, and is provided so as to be able to approach and move away from the disk relatively in the axial direction of the disk. a plurality of rotatable straightening rolls, each having a conical surface that pinches the disc-shaped plate in the plate thickness direction between the opposing disc portions when relatively approached by the disc, and the straightening rolls; a back-up roll supported from a side opposite to the disc side; a rotational drive means for rotating at least one of the straightening roll and the disc; and an advance/retreat drive means for moving the disc and the straightening roll relatively toward and away from each other. A disk-shaped plate flatness correction device consisting of.