JP2001105050A - Metal ring circumference correction method - Google Patents

Abstract

(57) [Summary] [Problem] To provide a perimeter correction method that can easily and surely correct the perimeter of a metal ring to a desired perimeter and improve the yield. A metal ring (W) is wound around a driving roller (2), a driven roller (3), and a correction roller (4). The driving roller 2 and the driven roller 3 are held at a predetermined interval. Straightening roller 4
The metal ring W is displaced in a direction perpendicular to the direction of displacement of the driving roller 2 and the driven roller 3 and in a direction in which the metal ring W extends, by a predetermined displacement amount with respect to a reference value of the circumference of the metal ring W.
Is corrected. With the driving roller 2 and the driven roller 3 being tensioned, the actual size of the circumference of the metal ring W is determined.
The actual size of the circumference is compared with a reference value of the circumference of the metal ring W to determine the difference between the two. According to the difference between the actual size of the circumference and the reference value,
The displacement amount of the correction roller 4 is corrected. The correction roller 4 holds the corrected displacement amount for a predetermined time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for correcting the circumference of a metal ring used in a continuously variable transmission or the like.

[0002]

2. Description of the Related Art Conventionally, an endless metal belt used in a continuously variable transmission is manufactured as follows. First, a ring-shaped drum is formed by welding the ends of a thin sheet of super-strong steel such as maraging steel, and then the drum is cut into a predetermined width and rolled to form a metal ring having a predetermined circumference. I do. The metal ring that has been rolled to a predetermined circumference is subjected to a solution lengthening treatment after the solution treatment, so that the circumference is corrected to an accurate circumference, and the hardness is further improved by aging and nitriding. The metal ring is formed by laminating a plurality of metal rings each having a slightly different peripheral length to form an endless metal belt. Therefore, the circumference correction processing is extremely important in order to form the endless metal belt by laminating the plurality of metal rings.

[0003] The present applicant has already proposed the apparatus shown in FIG.
0-102428). The peripheral length correcting device 1 shown in FIG. 1 includes a driving roller 2 around which a metal ring W is looped and a driven roller 3, and further includes a correction roller 4 at an intermediate position between the driving roller 2 and the driven roller 3. Drive roller 2
Is rotatably supported by a base member 6 provided on a base 5 via a support member 7, and the driven roller 3 is slidably movable in a horizontal direction on a guide rail 9 fixed on the base member 6. It is rotatably supported by the engaged guide block 10 via a support member 11. The correction roller 4 is a driven roller 3
Is rotatably supported via a support member 22 on an end of a cylinder rod 21 of a hydraulic cylinder 20 that can be displaced in a direction (vertical direction) orthogonal to the displacement direction of the hydraulic cylinder 20.

[0006] The circumference correction device 1 includes a driven roller 3
And a second displacement sensor 28 that detects the displacement of the correction roller 4.

According to the circumference correction device 1, the driving roller 2,
When the metal ring W is wound around the driven roller 3 and the correction roller 4, first, the driven roller 3 is displaced by the load of the weights 15a and 15b to tension the metal ring W. Next, while the driving roller 2 is driven to rotate by a control device (not shown), the displacement amount of the driven roller 3 is measured by the displacement sensor 25 while the metal ring W is in tension, and the driving roller 2 is driven.
The actual size of the circumference of the metal ring W is calculated from the distance between the shaft and the driven roller 3.

Next, the control device is required to correct the metal ring W to a desired circumference from the difference between the actual size of the circumference determined as described above and a desired circumference. The displacement amount of the correction roller 4 is calculated.

Next, the control device is provided with a hydraulic cylinder 20
Urges the correction roller 4 upward. At this time, the driven roller 3 moves toward the drive roller 2 by the urging force of the hydraulic cylinder 20, and the drive roller 2 and the driven roller 3 are moved in a state where the protrusions 12, 13 of the support members 11, 7 abut. It is kept at a predetermined interval. Then, in this state, the straightening roller 4
, The metal ring W is plastically deformed, and the straightening roller 4 is gradually displaced upward in response to the plastic deformation.

Therefore, the control device includes a displacement sensor 28.
Until the displacement amount of the correction roller 4 detected by the above becomes equal to the displacement amount calculated as described above, the correction roller 4 is biased upward by the hydraulic cylinder 20, and then the bias is released. Then, the driven roller 3 again outputs the weights 15a,
The metal ring W is displaced by the load of 15b, and the metal ring W is in a tension state.
The actual size of the circumference of the metal ring W after the correction processing is calculated from the distance between the shafts of the metal ring W and the driven roller 3. Then, the difference between the actual size of the perimeter after the correction processing and the desired perimeter is determined, and if the actual size matches the desired perimeter, the operation is terminated, and if not, the operation is terminated based on the difference. Repeat the above operation. As a result, it is possible to correct the actual circumference of the metal ring W so as to be a desired circumference.

However, in the circumferential length correction method, the operation of urging the straightening roller 4 upward by the cylinder 20 must be repeated a plurality of times before the actual size of the circumferential length of the metal ring W is corrected to a desired circumferential length. In some cases, there is a problem that it is complicated. Therefore, in order to solve the problem that the circumference correction by the circumference correction device shown in FIG. 1 is complicated, the correction roller 4 is mounted with the actual size of the circumference of the metal ring W after the solution treatment as a reference value. It is conceivable to displace the reference value upward by a predetermined displacement amount. By doing so, it is expected that the correction can be performed to a desired circumference by performing only one operation of urging the correction roller 4 upward.

However, according to the study of the present inventors, the actual size of the circumference of the metal ring W after the solution treatment is:
It is distributed over a fairly wide range under the influence of variations due to the conditions of rolling and solution treatment, and if the displacement amount of the correction roller 4 is uniformly determined for the actual size of the circumference, the circumference after the correction processing is determined. It was also found that the distribution of the actual size became large. If the actual size of the perimeter after the correction process is distributed in a wide range, when forming a plurality of metal rings W to form an endless metal belt, a large number of non-laminated ones occur.
There is an inconvenience that a reduction in yield cannot be avoided. The maraging steel used as the material of the metal ring W is expensive, and it is desired to improve the yield in order to reduce the manufacturing cost.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned disadvantages, and can easily and surely correct the perimeter of a metal ring to a desired perimeter, thereby improving the yield. It is an object of the present invention to provide a method for correcting the circumference of a metal ring that can be performed.

[0012]

In order to achieve the above object, a method of correcting a circumference according to the present invention is to provide a driving roller and a driven roller that can be displaced in a direction away from each other, and the driving roller and the driven roller. A metal ring is wrapped around a correction roller that can be displaced in a direction perpendicular to the direction of displacement of the drive roller and the driven roller at an intermediate position of the drive roller and the driven roller. Correct the circumference of the metal ring by displacing the metal ring in a direction perpendicular to the direction of displacement of the driving roller and the driven roller and extending the metal ring by a predetermined amount with respect to a reference value of the circumference of the metal ring. A circumferential length correction method, wherein the driving roller, the driven roller, and the correction roller are wound around the metal ring, and the driving roller and the driven roller are relatively separated from each other by a predetermined force. In the direction in which the metal ring is displaced in the direction of rotation, and determining the actual size of the circumference of the metal ring while being tensioned by the driving roller and the driven roller. A step of comparing the two to determine a difference between the two, and a step of correcting a displacement amount of the straightening roller according to a difference between an actual size of a circumference of the metal ring and the reference value.

According to the method of correcting the circumference of the metal ring of the present invention, the driving roller and the driven roller around which the metal ring is looped are held at a predetermined interval, and are provided between the driving roller and the driven roller. By displacing the straightening roller in a direction perpendicular to the displacement direction of the driving roller and the driven roller and in the direction in which the metal ring extends, the metal ring is plastically deformed, and the circumferential length is corrected. Here, the straightening roller is basically for displacing the reference value of the circumference of the metal ring by a predetermined amount of displacement, and the reference value is, for example, a value of the metal ring after rolling and solution treatment. As the circumference, a numerical value determined in design or process management is adopted.

However, the actual size of the perimeter of the metal ring after the rolling and solution treatment is distributed in a considerably wide range as described above, and an improvement in yield cannot be expected depending on the basic operation. Therefore, in the circumference correction method of the present invention, first, the driving roller and the driven roller are displaced in a direction relatively separated from each other by a predetermined force, and the metal ring is tensioned by the driving roller and the driven roller. Find the actual size of the circumference. Then, a difference between the actual size of the circumference and the reference value is obtained, and the displacement of the correction roller is corrected according to the difference.

As a result, according to the circumference correction method of the present invention, the amount of displacement of the correction roller with respect to the actual size of the circumference can be obtained based on the reference value, and the operation of displacing the correction roller can be performed. Is performed only once, the metal ring can be easily and reliably corrected to a desired circumference, and the yield can be improved.

Further, in the circumference correction method according to the present invention, the correction roller holds the corrected displacement amount for a predetermined time. With this configuration, the metal ring is plastically deformed to a length corresponding to the corrected displacement amount of the correction roller, and the circumferential length can be reliably corrected.

[0017]

Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. 1 is a configuration diagram showing an example of a circumference correction device used in the circumference correction method of the present embodiment, FIG. 2 is an explanatory diagram schematically showing a circumference correction method by the device shown in FIG. 1, and FIG. A histogram showing the frequency distribution of the actual size of the circumference of the metal ring used in the circumference correction method of the embodiment, and FIG. 4 is a graph showing the relationship between the actual size of the circumference of the metal ring and the correction value of the amount of displacement of the correction roller. .

As shown in FIG. 1, a circumference correction device 1 used in the present embodiment includes a driving roller 2 around which a metal ring W is wound and a driven roller 3, and further includes a driving roller 2, a driven roller 3, A correction roller 4 is provided at an intermediate position between the rollers. The drive roller 2 is rotatably supported by a base member 6 provided on a base 5 via a support member 7 so as to be rotatable, and is connected to a drive motor 8 (not shown) serving as a rotation drive source provided behind the base member 6. It is connected via a mechanism.

The driven roller 3 is rotatably supported via a support member 11 on a guide block 10 slidably engaged with a guide rail 9 fixed on the base member 6 in a horizontal direction. The guide block 10 includes moving means (not shown), and moves the driven roller 3 in a direction approaching the drive roller 2 so that the protrusion 12 formed on the support member 11 is moved to the protrusion 13 of the support member 7 of the drive roller 2. The metal ring W is looped around in the contact state. The support member 11 has a wire 14
The driven rollers 3 are released from the moving means after the metal ring W is wound around, and are moved in a direction away from the driving roller 2 by the load of the weights 15a and 15b. You. The wires 14 are rotatably supported by pulleys 17 a and 17 rotatably supported by a substantially L-shaped support 16 erected near an end of the base 5 on the guide rail 9 side.
b, 17c, and the weights 15a, 15b connected to the end of the wire 14 are directed in the direction of the load by pulleys 17a to 17c.
The light is converted from the vertical direction to the horizontal direction by c and transmitted to the support member 11.

On the upper part of the frame 18 erected at the end of the base member 6 on the side of the drive roller 2, the support member 19 can be displaced via a support plate 19 in a method (vertical direction) orthogonal to the direction of displacement of the driven roller 3. A hydraulic cylinder 20 is provided. The correction roller 4 is rotatably supported at the end of a cylinder rod 21 of the hydraulic cylinder 20 via a support member 22.

A first displacement sensor 25 having a probe 24 that can be displaced in a direction parallel to the displacement direction of the driven roller 3 is provided on a column 23 erected at the end of the base member 6 on the guide rail 9 side. Can be The probe 24 of the first displacement sensor 25 is urged toward the drive roller 3 by a spring member (not shown) or the like, and the tip of the probe 24 contacts the contact member 26 of the support member 11 and is displaced together with the support member 11. As a result, the first displacement sensor 25 detects the amount of displacement of the driven roller 3 based on the position of the support member 11 when the metal ring W is wound around as described above.

On the other hand, the support plate 22 is provided with a second displacement sensor 28 having a probe 27 that can be displaced in a direction parallel to the hydraulic cylinder 20. The probe 27 of the second displacement sensor 28 is urged toward the correction roller 4 by a spring member or the like (not shown), and the tip of the probe 27 is
Abuts on a contact member 29 projecting from the support member 22 in the horizontal direction, and is displaced together with the support member 22. As a result, the second
The displacement sensor 28 detects the amount of displacement of the correction roller 4 with reference to the position of the support member 22 when the metal ring W is looped around as described above.

Next, the basic operation of the circumference correction device 1 shown in FIG. 1 will be described. In the circumference correction device 1, first, the guide block 10 is moved in a direction approaching the drive roller 2 by moving means (not shown), and the support member 1 of the driven roller 3 is moved.
1 with the protrusion 13 of the support member 7 of the drive roller 2.
Abut. And the driving roller 2 and the driven roller 3
Then, the metal ring W is wrapped around the correction roller 4.

The metal ring W is formed by welding a thin plate of maraging steel into a ring-shaped drum by welding the ends of the thin plate to a predetermined width, and then rolling it to a predetermined circumference and performing a solution treatment. A predetermined reference value is set for the circumference after the solution treatment in terms of design or process management.

When the metal ring W is looped around, the guide block 10 is released from the moving means, and the weight 15
For example, a load of a and 15b of 30 kgf is applied to the support member 11. As a result, the driven roller 3 is moved in a direction away from the drive roller 2, and the metal ring W is in a state of being tensioned by the load of the weights 15a and 15b in a rotating state.
The drive motor 8 is operated by control means (not shown), and the drive roller 2 is driven to rotate.
By temporarily rotating at a rotation speed of 0 rpm or more, the metal structure inside the metal ring W is adapted to the rotation and homogenized.

Next, the control means includes a hydraulic cylinder 20
Accordingly, the straightening roller 4 is urged upward with a tensile load of, for example, 200 kgf or more. Then, the driven roller 3 is moved in the direction approaching the drive roller 2 against the load of the weights 15a and 15b, and the protrusion 1 of the support member 11 of the driven roller 3 is moved.
2 is held in a state of being brought into contact with the protrusion 13 of the support member 7 of the drive roller 2. As described above, the driving roller 2
When the straightening roller 4 is urged upward by the hydraulic cylinder 20 with the and the driven roller 3 held at a predetermined interval, the metal ring W is stretched and plastically deformed.

As a result, as shown schematically in FIG. 2, the correction roller 4 is gradually displaced upward from the state shown by the imaginary line in response to the plastic deformation. The control device detects the displacement X of the correction roller 4 by the second displacement sensor 28, and releases the bias when X reaches a predetermined displacement with respect to the reference value of the circumference of the metal ring W. I do. When the correction roller 4 returns to the initial position, the weights 15a, 15
b, the load of, for example, 30 kgf is released, the drive roller 2 is stopped, and the metal ring W is taken out to complete the operation.

In the basic operation, the displacement X of the straightening roller 4 is set to a predetermined value with respect to the reference value of the circumference of the metal ring W after rolling and solution treatment. However, the actual size of the circumference of the metal ring W after rolling and solution treatment shows a considerably large distribution. For example, in the case of FIG. 3, the reference value is 0, and the difference between the longest and the shortest is 1.8 mm. Has been reached. The reason that the distribution of the actual size of the circumference is increased,
Specifically, variations in the composition of the maraging steel, which is the material of the metal ring, for each lot, variations in the rolling reduction ratio, variations in the furnace temperature of the solution furnace, variations in the residual stress release amount, and the like are conceivable. .

With respect to the metal ring W whose actual circumference has a distribution as shown in FIG. 3, the displacement X of the straightening roller 4 is uniformly determined with respect to the reference value as in the basic operation. When the value is set to the value, the circumference after the correction also has a large distribution reflecting the distribution shown in FIG.

Next, the operation of the circumference correction device 1 shown in FIG. 1 in this embodiment will be described. In the circumference correction method of the present embodiment, the driving roller 2,
After the metal ring W is wound around the driven roller 3 and the correction roller 4, the driven roller 3 is moved in a direction away from the drive roller 2, and the metal ring W is rotated and the weights 15 a,
When the tension is applied by the load of 15b, first, the control device obtains the actual size of the circumference of the metal ring W. The actual size of the circumference of the metal ring W is determined by a support member 1 detected by a first displacement sensor 25 via a probe 24.
1 is calculated based on the distance between the axes of the driving roller 2 and the driven roller 3 calculated from the displacement of No. 1.

Next, the control means calculates a difference between the actual size of the circumference of the metal ring W calculated as described above and the reference value, and calculates a displacement X of the correction roller 4 according to the difference. to correct. The displacement X is corrected by adding a predetermined amount to the displacement X when the actual size of the circumference of the metal ring W is shorter than the reference value, and when the actual size of the circumference of the metal ring W is longer than the reference value. A predetermined amount is subtracted from the amount X.

In this embodiment, the predetermined amount (ΔX) to be added to or subtracted from the displacement X is calculated by the following equation (1), where L is the actual size of the circumference of the metal ring W.

ΔX = −a (L−reference value) (1) In equation (1), a is the order of the stack when a plurality of metal rings W are stacked to form an endless metal belt. It is a constant determined depending on whether it is performed, and is appropriately set in the range of 0.10 to 0.20. Determined according to equation (1),
The actual length L of the circumference of the metal ring W and the displacement X of the straightening roller 4
FIG. 4 shows the relationship with the correction value ΔX for the case where a = 0.18, for example.

Next, the control device controls the amount of displacement of the correction roller 4 detected by the second displacement sensor 28 in a state where the driving roller 2 and the driven roller 3 are held at a predetermined interval as described above. Until X + ΔX is reached, the hydraulic cylinder 20
Urges the straightening roller 4 upward to plastically deform the metal ring W. Then, the displacement amount of the correction roller 4 is X + ΔX
, The displacement is held for a predetermined time, for example, 4 ± 0.2 seconds. By holding the displacement amount for a predetermined time,
The metal ring W is reliably plastically deformed to a length corresponding to the displacement amount, and a stable circumference is obtained after correction.

Next, the control device operates the hydraulic cylinder 20
Is released, and when the correction roller 4 returns to the initial position, the driving roller 2 is stopped, the metal ring W is taken out, and the operation is completed.

In this embodiment, ΔX is continuously determined for the actual size L of the circumference of the metal ring W. However, for example, ΔX is determined every time the actual size L changes by 50 μm. Is also good.

In the present embodiment, the driven roller 3 is moved in the direction away from the drive roller 2 when the actual size L of the circumference of the metal ring W is determined.
May be moved in a direction away from the driven roller 3,
The driving roller 2 and the driven roller 3 may be moved in a direction away from each other.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of a circumference correction device used in a circumference correction method of the present invention.

FIG. 2 is an explanatory view schematically showing a circumference correction method by the apparatus shown in FIG. 1;

FIG. 3 is a histogram showing an example of an actual frequency distribution of the circumference of a metal ring used in the circumference correction method of the present invention.

FIG. 4 is a graph showing a relationship between an actual size of a circumference of a metal ring and a correction value of a displacement amount of a correction roller.

[Explanation of symbols]

1 ... circumference correction device, 2 ... drive roller, 3 ... driven roller, 4 ... correction roller, X: displacement amount of correction roller,
W: Metal ring.

Claims (2)

[Claims] 1. A driving roller and a driven roller that can be displaced relatively away from each other, and that can be displaced in a direction perpendicular to the direction of displacement of the driving roller and the driven roller at an intermediate position between the driving roller and the driven roller. A metal ring is wrapped around the correction roller, and the drive roller and the driven roller are held at a predetermined interval, and the correction roller is moved in a direction perpendicular to the displacement direction of the drive roller and the driven roller and extending the metal ring. A circumferential length correction method for correcting the circumferential length of the metal ring by displacing the circumferential length of the metal ring by a predetermined displacement amount with respect to a reference value of the circumferential length of the metal ring, wherein The metal ring is displaced in a direction in which the driving roller and the driven roller are relatively separated from each other by a predetermined force, and the metal ring is tensioned by the driving roller and the driven roller. Determining the actual size of the circumference of the metal ring; comparing the actual size of the circumference of the metal ring with a reference value of the circumference of the metal ring to determine the difference between the two; Correcting the amount of displacement of the straightening roller according to a difference between the correction value and the reference value. 2. The method according to claim 1, wherein the correction roller holds the corrected amount of displacement for a predetermined time.