JP5776455B2 - Endless metal ring manufacturing apparatus and manufacturing method - Google Patents

Description

  The present invention relates to an endless metal ring manufacturing apparatus and manufacturing method.

  Conventionally, this kind of endless metal ring is used for a transmission belt for power transmission of a continuously variable transmission (CVT). A continuously variable transmission belt includes a ring laminate formed by laminating a plurality of metal rings with slightly different circumferential lengths in the radial direction, and a plurality of ring-shaped bundles bound together by the ring laminate. It is composed of elements. The continuously variable transmission belt is wound around the driving pulley and the driven pulley, and rotates along the driving pulley and the driven pulley by a pressing force between the elements in contact with each other, and the driving force is transferred from the driving pulley to the driven pulley. To communicate. As such a metal ring manufacturing apparatus, for example, a circumference correction apparatus described in Patent Document 1 is known.

  The peripheral length correcting device described in Patent Document 1 is a method in which a driving roller and a driven roller and a part of a circumferential direction of an endless metal ring wound between the rollers are locally directed from the inside to the outside. It is comprised from the correction | amendment roller for pressing. By using this circumferential length correcting device, the metal ring is given an arc shape that is convex on the outer circumferential side in the cross section in the width direction. Due to the arcuate shape of the metal ring, when a plurality of the metal rings are stacked, the stacked state is easily maintained.

However, in the metal ring manufactured by the peripheral length correcting device described in Patent Document 1, the inner peripheral portion of the metal ring is locally pressed toward the outer peripheral side of the inner peripheral surface of the metal ring. Since the tensile residual stress is applied to the inner surface, there is a problem that the strength of the inner peripheral portion has no margin with respect to the required strength and the durability is lowered.
Therefore, the present applicant has proposed a method for manufacturing a laminated ring that solves this problem in the application of Japanese Patent Application No. 2010-048250.
FIG. 20 shows a manufacturing method of this laminated ring, which is wound between two fixed rollers 680 in a residual stress applying step performed after a peripheral length adjusting step of adjusting the peripheral length of the band-shaped metal member 120. By pressing the band-shaped metal member 120 from the outer peripheral surface side to the inner peripheral surface side of the band-shaped metal member 120 using the moving roller 700, compressive residual stress is applied to the inner peripheral portion of the band-shaped metal member 120. This is intended to increase the durability of the band-shaped metal member 120.

JP 2009-22991 A

However, the previously proposed residual stress application process has the following problems.
That is, in the method of manufacturing the laminated ring, when the band-shaped metal member 120 wound between the two fixed rollers 680 is removed from the two fixed rollers 680, the band-shaped metal member 120 is removed from the outer peripheral surface side to the inner peripheral surface. The compressive residual stress applied to the outer peripheral side of the band-shaped metal member 120 by the previous peripheral length adjusting step due to the influence of the moving roller 700 pressing toward the side decreases, and the durability of the band-shaped metal member 120 decreases. There was a problem.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an endless metal ring manufacturing apparatus and manufacturing method excellent in durability.

In order to solve the above problems, an endless metal ring manufacturing apparatus of the present invention has the following configuration.
(1) An endless metal ring manufacturing apparatus, a holding roller disposed on an inner peripheral side of the endless metal ring, a position where tension is applied to the endless metal ring by the holding roller, and tension A holding roller moving means capable of moving the holding roller between a position where the endless metal ring is not provided, an outer peripheral roller disposed on the outer peripheral side of the endless metal ring, and the outer peripheral side of the endless metal ring on the outer peripheral side. An outer peripheral roller moving means capable of moving the outer peripheral roller between a position where the outer peripheral roller is pressed and a position where the outer peripheral roller is not pressed, and the outer peripheral roller is moved to a position where the endless metal ring is not pressed by the outer peripheral roller moving means. Control means for controlling the holding roller to be moved to a position where no tension is applied to the endless metal ring by the holding roller moving means. Apparatus for manufacturing an endless metal ring, characterized in that the.

(2) In the manufacturing apparatus of the endless metal ring described in (1), the holding roller includes a pair of first holding rollers and a pair of second holding rollers having a diameter larger than that of the first holding roller. The holding roller moving means is capable of moving the second holding roller, and the control means is in a position where it does not press the endless metal ring by the outer peripheral side roller moving means. After the outer peripheral side roller is moved, the endless metal ring is manufactured by the holding roller moving means so that the holding roller is moved to a position where no tension is applied to the endless metal ring. apparatus.
(3) In the endless metal ring manufacturing apparatus described in (2), the first end point between a position where tension is applied to the endless metal ring by the first holding roller and a position where tension is not applied. An endless metal ring manufacturing apparatus, further comprising small-diameter holding roller moving means capable of moving the holding roller.
(4) In the endless metal ring manufacturing apparatus described in (3), the small-diameter holding roller moving means can apply tension exceeding the yield force of the endless metal ring to the endless metal ring, and The apparatus for producing an endless metal ring, wherein the roller moving means can apply a tension within a range not exceeding a yield force of the endless metal ring to the endless metal ring.

In order to solve the above problems, an endless metal ring manufacturing apparatus of the present invention has the following configuration.
(5) A method of manufacturing an endless metal ring, the holding step of holding the endless metal ring by a holding roller disposed on the inner peripheral side of the endless metal ring, and the endless metal held in the holding step A residual stress applying step of pressing from the outer peripheral side of the ring by the outer peripheral side roller, a retracting step of retracting the outer peripheral side roller from the endless metal ring, and moving the holding roller to release the tension of the endless metal ring. A release step, and a manufacturing method of an endless metal ring.
(6) A method for producing an endless metal ring, the circumference adjusting step in which the circumference of the endless metal ring is adjusted by a first holding roller disposed on the inner peripheral side of the endless metal ring; A holding step of holding the endless metal ring by a second holding roller having a diameter larger than that of the first holding roller, and pressing from the outer peripheral side of the endless metal ring held in the holding step by the outer peripheral side roller A residual stress applying step, a retreating step of retracting the outer peripheral side roller from the endless metal ring, and a releasing step of releasing the tension of the endless metal ring by moving the second holding roller. A method for producing an endless metal ring.

The operation and effect of the manufacturing apparatus and the manufacturing method of the endless metal ring of the present invention having the above configuration will be described.
In the endless metal ring manufacturing apparatus of the present invention,
(1) An endless metal ring manufacturing apparatus, a holding roller disposed on an inner peripheral side of the endless metal ring, a position where tension is applied to the endless metal ring by the holding roller, and tension A holding roller moving means capable of moving the holding roller between a position where the endless metal ring is not provided, an outer peripheral roller disposed on the outer peripheral side of the endless metal ring, and the outer peripheral side of the endless metal ring on the outer peripheral side. An outer peripheral roller moving means capable of moving the outer peripheral roller between a position where the outer peripheral roller is pressed and a position where the outer peripheral roller is not pressed, and the outer peripheral roller is moved to a position where the endless metal ring is not pressed by the outer peripheral roller moving means. Control means for controlling the holding roller to be moved to a position where no tension is applied to the endless metal ring by the holding roller moving means. Because it is, an excellent effect that the compressive residual stress imparted to the outer peripheral side of the endless metal rings without reducing, thereby improving the durability of the belt-shaped metal member.

(2) In the manufacturing apparatus of the endless metal ring described in (1), the holding roller includes a pair of first holding rollers and a pair of second holding rollers having a diameter larger than that of the first holding roller. The holding roller moving means is capable of moving the second holding roller, and the control means is in a position where it does not press the endless metal ring by the outer peripheral side roller moving means. After the outer peripheral side roller is moved, the holding roller moving means controls the holding roller to be moved to a position where no tension is applied to the endless metal ring, so that it is applied to the outer peripheral side of the endless metal ring. The applied compressive residual stress is not reduced, and is applied to the inner peripheral side of the endless metal ring by using a second holding roller having a diameter larger than that of the first holding roller. Compressive residual stress without reducing, therefore, the durability of the belt-shaped metal member is significantly improved.

(3) In the endless metal ring manufacturing apparatus described in (2), the first end point between a position where tension is applied to the endless metal ring by the first holding roller and a position where tension is not applied. Further, a small-diameter holding roller moving means capable of moving the holding roller can be provided, so that compressive residual stress can be effectively applied to the outer peripheral side of the endless metal ring. improves.

(4) In the endless metal ring manufacturing apparatus described in (3), the small-diameter holding roller moving means can apply a tension exceeding the yield stress of the endless metal ring to the endless metal ring. The roller moving means is characterized in that a tension within a range not exceeding the yield stress of the endless metal ring can be applied to the endless metal ring, so that compressive residual stress is applied to the outer peripheral side and inner peripheral side of the endless metal ring. It can be effectively applied, and therefore the durability of the band-shaped metal member is improved. Further, compressive residual stress can be applied to the inner peripheral side of the endless metal ring without affecting the peripheral length of the endless metal ring.

Moreover, in the manufacturing method of the endless metal ring of the present invention,
(5) A method of manufacturing an endless metal ring, the holding step of holding the endless metal ring by a holding roller disposed on the inner peripheral side of the endless metal ring, and the endless metal held in the holding step A residual stress applying step of pressing from the outer peripheral side of the ring by the outer peripheral side roller, a retracting step of retracting the outer peripheral side roller from the endless metal ring, and moving the holding roller to release the tension of the endless metal ring. Therefore, the compressive residual stress applied to the outer peripheral side of the endless metal ring is not reduced, and the durability of the band-shaped metal member is improved.
(6) A method for producing an endless metal ring, the circumference adjusting step in which the circumference of the endless metal ring is adjusted by a first holding roller disposed on the inner peripheral side of the endless metal ring; A holding step of holding the endless metal ring by a second holding roller having a diameter larger than that of the first holding roller, and pressing from the outer peripheral side of the endless metal ring held in the holding step by the outer peripheral side roller A residual stress applying step, a retreating step of retracting the outer peripheral side roller from the endless metal ring, and a releasing step of releasing the tension of the endless metal ring by moving the second holding roller. Since it is a feature, it is possible to effectively apply compressive residual stress to the outer peripheral side and inner peripheral side of the endless metal ring, and thus the durability of the band-shaped metal member is improved.

FIG. 3 is a perspective view showing a part of the transmission belt in the circumferential direction of the vehicle belt-type continuously variable transmission according to the first embodiment. It is a perspective view which shows it with a cross section of the width direction about a strip | belt-shaped metal member. It is a figure which shows distribution of the thickness direction of the residual stress of the direction perpendicular | vertical to the cross section of a strip | belt-shaped metal member. It is process drawing for demonstrating the manufacturing process of a lamination | stacking ring. It is a figure which shows notionally the circumference adjustment apparatus used at the circumference adjustment process of FIG. It is a figure which shows distribution of the thickness direction of the total stress of the positive side exceeding the yield stress among the total stress which added the tensile stress and bending stress just before completion | finish of the circumference adjustment process of FIG. It is a figure which shows distribution of the thickness direction of the residual stress which remains in the strip | belt-shaped metal member made into the free state. It is a figure which shows notionally the residual stress provision apparatus used in the residual stress provision process P9 of FIG. It is sectional drawing which shows the moving roller vicinity of a residual stress provision apparatus. It is sectional drawing which shows the pressurization roller vicinity of a residual stress provision apparatus. It is a figure which shows distribution of the thickness direction of the total stress given to a strip | belt-shaped metal member in the residual stress provision process of FIG. It is a figure explaining the change of the yield stress of a strip | belt-shaped metal member after the residual stress provision process of FIG. Of the residual stress remaining in the free-form strip-shaped metal member, the distribution in the thickness direction of the residual stress due to the stress excluding the residual stress applied to the strip-shaped metal member in the circumferential length adjusting step of FIG. FIG. It is a figure which shows distribution of the thickness direction of the stress which remains in the strip | belt-shaped metal member made into the free state. It is a figure which shows distribution of the thickness direction of the residual stress provided to a strip | belt-shaped metal member by the nitriding process of FIG. It is a figure which shows the detailed process of a circumference adjustment process and a residual stress provision process. It is a figure which shows the detailed process of the circumference adjustment process and residual stress provision process which concern on a modification. It is a figure which shows the distribution of the thickness direction of the stress given to a strip | belt-shaped metal member in the conventional residual stress provision process. It is a figure which shows the distribution of the thickness direction of the stress which remains in a strip | belt-shaped metal member by the conventional residual stress provision process. It is explanatory drawing which shows the residual stress provision apparatus which concerns on a previous application.

(Embodiment 1)
Embodiments of an endless metal ring manufacturing apparatus according to the present invention will be described below in detail with reference to the drawings. In the following embodiments, the drawings are drawn with simplified or modified exaggeration as appropriate, and the dimensional ratios and shapes of the respective parts are not necessarily the same as those in the embodiments.

  FIG. 1 is a perspective view showing a part in the circumferential direction of a transmission belt 10 of a belt type continuously variable transmission for a vehicle using a thin plate-like endless metal ring manufactured by an endless metal ring manufacturing apparatus according to the present invention. is there. In FIG. 1, a transmission belt 10 includes a plurality of endless annular band-like metal members (corresponding to endless metal rings of the present invention) 12 that are stacked in close contact with each other and arranged in parallel to each other. 14 and a plurality of metal elements 18 each made of a plate-like metal continuously connected in the thickness direction along the laminated ring 14.

  A pair of ring holding grooves 20 extending substantially horizontally toward the center in the width direction are formed on both side surfaces of the metal element 18 in the width direction. The pair of laminated rings 14 are respectively inserted into a pair of ring holding grooves 20 formed in the plurality of metal elements 18 in order to support the plurality of metal elements 18. The laminated ring 14 is formed by, for example, laminating a plurality of strip-shaped metal members 12 that are adjusted so that the circumferential length gradually increases from the inner circumferential side toward the outer circumferential side, in order from the inner circumferential side. In FIG. 1, for convenience, the laminated ring 14 including the three strip-shaped metal members 12 is illustrated, but may be configured by six or ten strip-shaped metal members 12.

  FIG. 2 is a perspective view showing one band-shaped metal member 12 of the plurality of band-shaped metal members 12 constituting the laminated ring 14 together with a cross section in the width direction. In FIG. 2, a thin plate-like band-shaped metal member 12 is made of steel such as maraging steel or stainless steel. And the strip | belt-shaped metal member 12 is formed so that the cross section of the width direction may become circular arc shape (crowning) which forms convex shape on the outer peripheral side (upper side in FIG. 2). Thereby, when a plurality of the band-shaped metal members 12 are laminated, the inner peripheral surface 22 and the outer peripheral surface 24 are respectively engaged with the outer peripheral surface and the inner peripheral surface of the band-shaped metal member provided on the inner peripheral side and the outer peripheral side, respectively. By doing so, the stacked state of each other can be easily maintained.

FIG. 3 is a diagram showing the distribution in the thickness direction of the residual stress σ (MPa or N / mm ² ) in the direction perpendicular to the cross section of the band-shaped metal member 12 in a free state (a state extended to a flat plate). The strip-shaped metal member 12 has a thickness t as shown in FIG. 2, and t in FIG. 3 corresponds to this. As shown in FIG. 3, the compressive residual stress shown on the negative side (left side) from the broken line indicating σ = 0 remains in the outer peripheral portion and the inner peripheral portion in the thickness direction of the band-shaped metal member 12. And the tensile residual stress shown by the positive side (right side) rather than the broken line which shows (sigma) = 0 remains in the center part of the thickness direction of the strip | belt-shaped metal member 12. FIG. The two-dot chain line in FIG. 3 indicates the distribution in the thickness direction of the residual stress required on the compression side at the minimum when the laminated ring 14 of the transmission belt 10 is composed of, for example, six belt-shaped metal members 12. If the residual stress of the metal member 12 is on the compression side, that is, the left side of FIG. 3 with respect to the residual stress distribution indicated by the two-dot chain line, the band-like metal member 12 has the necessary strength. In the band-shaped metal member 12 of the present embodiment, the residual stress is distributed on the compression side from the residual stress indicated by the two-dot chain line at any position in the thickness direction, so the laminated ring 14 of the transmission belt 10 shown in FIG. For example, it has a preset strength required when it is composed of six strip-shaped metal members 12.

  FIG. 4 is a process diagram for explaining a manufacturing process of the laminated ring 14 shown in FIG. Hereinafter, a method for manufacturing the laminated ring 14 will be described with reference to the process diagram of FIG.

  In FIG. 4, first, in the steel strip cutting step P1, a steel strip 30 such as maraging steel or stainless steel is cut into a predetermined length, and a flat plate 32 is formed.

  Next, in the welding process P <b> 2, one and the other cut surfaces of the flat plate 32 are welded together to form the cylindrical member 34.

  Next, in the first solution heat treatment step P3, in order to homogenize the hardness of the cylindrical member 34 in which the vicinity of the welded portion is partially hardened by the heat during welding in the welding step P2, the first cylindrical member 34 is subjected to the first solution treatment step P3. The solution treatment of is performed.

  Next, in the cylindrical member cutting step P4, the cylindrical member 34 is cut in a direction orthogonal to the axial center every predetermined length in the axial direction, and a plurality of short cylindrical members 36 are formed.

  Next, in the barrel polishing step P5, all or a part of the short cylindrical member 36 is put into a predetermined container that rotates or vibrates together with an abrasive and is polished.

Next, in the rolling process P6, the polished short cylindrical member 36 is rolled to a predetermined thickness, and the annular member 38 is formed.

Next, in the second solution treatment step P7, in order to restore the metal structure of the annular member 38 deformed by rolling in the rolling step P6, the annular member 38 is subjected to a second solution treatment. The

Next, in the circumference adjusting step P8, the annular member 38 subjected to the second solution treatment is adjusted to a predetermined circumference. FIG. 5 is a diagram conceptually showing the peripheral length adjusting device used in the peripheral length adjusting step P8 of FIG. In FIG. 5, the circumferential length adjusting device 40 has a fixed roller 42 that is fixed to be rotatable around an axis C <b> 1, and a rotatable and fixed roller 42 around an axis C <b> 2 that is parallel to the axis C <b> 1. And a moving roller 44 provided so as to be able to approach and separate. The outer peripheral surfaces of the fixed roller 42 and the moving roller 44 are each formed in a circular arc shape having a convex shape on the outer peripheral side in a cross section passing through the shaft centers C1 and C2. In this embodiment, the radius rA of the moving roller 44 and the radius rB of the fixed roller 42 are set equal. The fixed roller 42 and the moving roller 44 constitute the holding roller and the first holding roller of the present invention.

  In the circumferential length adjusting step P8, the circumferential length adjusting device 40 configured as described above is used, and as shown in the detailed steps in FIG. 16, first, the band-shaped metal member 12 is slackened by the fixed roller 42 and the moving roller 44. (Step 10; hereinafter referred to as S10: setting process). Thereafter, the moving roller 44 is rotationally driven by an electric motor (not shown), so that the belt-shaped metal member 12 is rotated in the circumferential direction as indicated by an arrow f in FIG. 5, and as indicated by an arrow b in FIG. By moving the moving roller 44 away from the fixed roller 42, the first load F1 is applied so that the band-shaped metal member 12 is stretched in the circumferential direction and tension is applied to the band-shaped metal member 12 (S12: tension application). Process). In the present embodiment, based on a relationship obtained experimentally in advance, based on the displacement Y from the original position of the moving roller 44 indicated by a one-dot chain line in FIG. Adjusted to the value. The belt-shaped metal member 12 is formed in an arc shape in which the cross section in the width direction is convex on the outer peripheral side by transferring the shape of the outer peripheral surface of the fixed roller 42 and the moving roller 44 when adjusting the peripheral length. . Thereafter, the state in which the tension is applied to the belt-shaped metal member 12 is held for a certain time (S14: tension holding step), and then the moving roller 44 approaches the fixed roller 42, that is, the direction indicated by the arrow a in FIG. , The tension applied to the band-shaped metal member 12 is released (S16: tension release step), and thus the band-shaped metal member 12 can be detached from the moving roller 44 and the fixed roller 42. (S18: Removal step). The moving roller 44 can be moved by using various types of actuators such as a hydraulic type, an electric type, and a pneumatic type. For example, the holding force adjustment as shown in FIG. It is also possible to adjust the tension (first load F1) applied to the band-shaped metal member 12 using the device 49, and either of them constitutes the small-diameter holding roller moving means of the present invention.

FIG. 6 shows the distribution in the thickness direction of the total stress σ1 on the positive side exceeding the yield stress σy0 among the total stress obtained by adding the tensile stress σTA and the bending stress σbA immediately before the end of the circumference adjusting step P8 of the band-shaped metal member 12. FIG. Immediately before the end of the circumferential length adjusting step P8, the belt-shaped metal member 12 is subjected to a tensile stress σTA by the moving roller 44 shown by a one-dot chain line in FIG. 6 and a bending by the moving roller 44 shown by a two-dot chain line in FIG. Stress σbA is applied.

6, breakdown region S1, the total stress exceeds the yield stress σy0 of the belt-shaped metal member 12, the total stress is a region also strain remains removed. The yield stress σy0 is an eigenvalue determined by the material of the band-shaped metal member 12. Immediately before the end of the circumferential length adjusting step P8, the band-shaped metal member 12 is plastically deformed in the circumferential direction so that the outer peripheral side is closer to the outer peripheral side than the neutral surface N, and the inner peripheral side is elastically deformed from the neutral surface N. Is done.

  When the tension T1 is removed from the state as described above and the belt-shaped metal member 12 is brought into a free state, the band-shaped metal member 12 is deformed so as to return the strain to the original state, but the strain remains on the outer peripheral side from the neutral surface N. And in the case of the said deformation | transformation, the outer peripheral part of the strip | belt-shaped metal member 12 is compressed to the circumferential direction, so that the outer peripheral side with larger residual strain is large. FIG. 7 is a diagram showing the distribution in the thickness direction of the stress remaining on the band-shaped metal member 12 in the free state, that is, the residual stress σrA. As shown in FIG. 7, a large compressive residual stress remains on the outer peripheral portion of the band-shaped metal member 12 toward the outer peripheral side, and a predetermined tensile residual stress σrA1 remains on the inner peripheral portion.

  Returning to FIG. 4, after the circumferential length adjusting step P <b> 8, in the residual stress applying step P <b> 9, compressive residual stress is applied to the inner peripheral portion of the band-shaped metal member 12 whose peripheral length is adjusted. FIG. 8 is a diagram conceptually showing the residual stress applying device 66 used in the residual stress applying step P9. In FIG. 8, the residual stress applying device 66 includes a fixed roller 67 that is fixed to be rotatable around an axis C <b> 3, and a rotary roller that is rotatable around an axis C <b> 4 parallel to the axis C <b> 3. The movable roller 68 is provided so as to be capable of approaching and separating, and the metal pressure roller 70 is provided so as to be rotatable around an axis C5 parallel to the axes C3 and C4. The fixed roller 67 and the moving roller 68 constitute the holding roller and the second holding roller of the present invention. Further, the pressure roller 70 constitutes the outer peripheral roller of the present invention.

  The outer peripheral surfaces of the fixed roller 67 and the moving roller 68 are each formed in an arc shape having a convex shape on the outer peripheral side in a cross section passing through the shaft centers C3 and C4. The pressure roller 70 is formed in a circular arc shape having a concave shape in a cross section passing through the axis C6, and the radius of curvature thereof is substantially the same as or slightly smaller than the outer peripheral surfaces of the fixed roller 67 and the moving roller 68. Is formed. The radius rB ′ of the fixed roller 67, the radius rA ′ of the moving roller 68, and the radius rC of the pressure roller 70 are set to be the same, and the radius rA of the moving roller 44 of the circumferential length adjusting device 40 is set. The radius rB of the fixed roller 42 is also set to be the same. Further, the fixed roller 67, the moving roller 68 and the pressure roller 70 are made of a metal material such as iron or aluminum.

  The band-shaped metal member 12 is supported in a state of being wound around the fixed roller 67 and the moving roller 68. That is, the fixed roller 67 and the moving roller 68 are positioned inside the band-shaped metal member 12, and the pressure roller 70 is positioned outside the band-shaped metal member 12.

  FIG. 9 is a cross-sectional view showing the vicinity of the moving roller 68 of the residual stress applying device 66 shown in FIG. As shown in FIG. 9, the holding force adjusting device 49 is fixed to the hydraulic actuator 50 fixed to the support wall 48 and the distal end portion of the output rod 52 of the hydraulic actuator 50, and the rotating shaft 54 of the moving roller 68. The third load F3 acting on the band-shaped metal member 12 from the moving roller 68 by measuring the axial force acting on the support member 56 that rotatably supports both ends of the actuator and the output rod 52 of the hydraulic actuator 50 Is indirectly measured, and a load cell 60 that outputs the measurement result to the control device 65 and an electric motor 58 that rotationally drives the rotary shaft 54 of the moving roller 68 are provided. When the hydraulic actuator 50 is supplied with hydraulic pressure from the hydraulic source 61 to the first hydraulic chamber 62 via the hydraulic control unit 63, the output rod 52 and the moving roller 68 connected thereto are connected to the first hydraulic chamber 62 with reference to FIGS. Is moved in a direction approaching the fixed roller 67 indicated by an arrow a, and the hydraulic pressure is supplied from the hydraulic source 61 to the second hydraulic chamber 64 via the hydraulic control unit 63, thereby being connected to the output rod 52 and the output rod 52. The moving metal roller 68 is moved in a direction away from the fixed roller 67 indicated by an arrow b in FIGS. 8 and 9, so that the band-shaped metal member 12 is wound around the fixed roller 67 and the moving roller 68. A third load F3 (tension) can be applied to the. The holding force adjusting device 49 constitutes the holding roller moving means of the present invention.

  The hydraulic pressure control unit 63 is controlled by the control device 65 based on the measurement result of the load cell 60, and thereby the third load F3 (tension) applied to the band-shaped metal member 12 is controlled. The control device 65 includes a known CPU, ROM, RAM, and the like. The control device 65 constitutes the control means of the present invention.

  The pressure roller 70 is a band-shaped metal member that is in the direction of locally pressing the outer peripheral surface of the band-shaped metal member 12 supported on the fixed roller 67 and the moving roller 68 toward the inner peripheral side, and opposite to the direction. 12 is provided so as to be movable in a direction away from 12. The pressure roller 70 constitutes a compressive residual stress applying mechanism (compressive residual stress applying means).

FIG. 10 is a sectional view showing the vicinity of the pressure roller 70 of the residual stress applying device 66 shown in FIG. As shown in FIG. 10, the stress applying device 71 is fixed to the hydraulic actuator 74 fixed to the support wall 72 and the tip of the output rod 76 of the hydraulic actuator 74, and the rotating shaft 78 of the pressure roller 70. A second load that acts on the belt-like metal member 12 from the pressure roller 70 by measuring the axial force acting on the support member 80 that rotatably supports both ends of the actuator and the output rod 76 of the hydraulic actuator 74. A load cell 82 that indirectly measures F2 and outputs the measurement result to the control device 65 is provided. The hydraulic actuator 74 supplies the output rod 76 and the pressure roller 70 connected thereto by supplying hydraulic pressure from the hydraulic source 61 to the first hydraulic chamber 84 via the hydraulic control unit 85, as shown in FIGS. The outer surface 24 of the band-shaped metal member 12 indicated by the arrow d in FIG. 10 is moved in the direction of pressing toward the inner peripheral side toward the elastic roller 69, and the second hydraulic chamber 86 is moved from the hydraulic source 61 via the hydraulic control unit 85. When the hydraulic pressure is supplied, the output rod 76 and the pressure roller 70 connected thereto are moved in a direction away from the band-shaped metal member 12 indicated by an arrow e in FIGS. 8 and 10.
The hydraulic pressure control unit 85 is controlled by the control device 65 based on the measurement result of the load cell 82, and thereby the second load F2 applied to the band-shaped metal member 12 is controlled.

  Therefore, the control device 65 causes the hydraulic actuator 50 of the holding force adjusting device 49 to be based on a signal representing the third load F3 supplied from the load cell 60 and also to the hydraulic actuator 74 of the stress applying device 71. Is based on a signal representing the second load F2 supplied from the load cell 82, and only the inner peripheral side of the neutral surface N (see FIG. 11) of the bending stress σbC due to the pressure roller 70 of the band-shaped metal member 12 is measured. In order to apply stress to the band-shaped metal member 12 that is plastically deformed and that is plastically deformed only by the pressure roller 70 without being plastically deformed by the fixed roller 67 and the moving roller 68, it is theoretically obtained in advance. The second load F2 and the third load F3 are controlled so as to satisfy the following conditions.

Here, the yield stress of the band-shaped metal member 12 when the residual stress applying step P9 is performed is increased from the yield stress σy0 to the yield stress σy1 as indicated by an arrow g in FIG. 12 due to work hardening in the previous step.
Among the above conditions, the third load F3 is a tensile stress σTC applied to the band-shaped metal member 12 by the moving roller 68 and the pressure roller 70 on the outer peripheral side of the neutral surface N of the band-shaped metal member 12, and a fixed roller 67. The sum of the bending stress σbA ′ applied to the band-shaped metal member 12 by the moving roller 68 and the residual stress σrA applied to the band-shaped metal member 12 in the circumferential length adjusting step P8 is the yield stress σy 1 of the band-shaped metal member 12. It is to make it as large as possible within a smaller range.

Of the above conditions, the second load F2 includes the tensile stress σTC applied to the band-shaped metal member 12 by the moving roller 68 and the pressure roller 70 on the outer peripheral side of the neutral surface N of the band-shaped metal member 12, and the pressure The sum of the bending stress σbC applied to the band-shaped metal member 12 by the roller 70 and the residual stress σrA applied to the band-shaped metal member 12 in the circumferential length adjusting step P8 is smaller than the yield stress σy 1 of the band-shaped metal member 12. It is to make it as large as possible. The tensile stress σTC, the bending stress σbC, and the bending stress σbA ′ are expressed by the following formulas (1) to (3). In Formula (1), T2 is the tension | tensile_strength of the circumferential direction of the strip | belt-shaped metal member 12, for example, is calculated based on the 3rd load F3 from a predetermined relationship. A1 is a cross-sectional area immediately before the end of the circumferential length adjusting step P8 of the belt-shaped metal member 12. In the equations (2) and (3), E is the Young's modulus of the band-shaped metal member 12, rC is the radius of the pressure roller 70, and rA ′ is the radius of the fixed roller 67 and the moving roller 68, where The fixed roller 67 and the moving roller 68 have the same diameter.
σTC = T2 / A1 (1)
σbC = E * (− y ) / (rC + (t / 2)) ((t / 2) ≧ y ≧ − (t / 2)) (2)
σbA ′ = E * ( y ) / (rA ′ + (t / 2)) ((t / 2) ≧ y ≧ − (t / 2)) (3)

  Returning to FIG. 8, in the residual stress applying step P <b> 9, the residual stress applying device 66 configured as described above is used. First, as shown in FIG. And the moving roller 68 is wound around without slack (S20: setting step). Thereafter, the moving roller 68 is moved by the holding force adjusting device 49 to apply tension to the belt-shaped metal member 12 (S22: tension applying step), and at the same time, one of the moving rollers 68 is rotationally driven by the electric motor 58. As shown by the arrow f in FIG. 8, the state in which the belt-shaped metal member 12 is rotated in the circumferential direction and tension is applied is maintained (S24: tension maintaining step). In this state, as shown by the arrow d in FIG. 8, the pressure roller 70 is moved in the direction of pressing the outer peripheral surface 24 of the strip-shaped metal member 12 toward the inner peripheral side with the force of the second load F2. A predetermined stress is applied to the band-shaped metal member 12 by the pressure roller 70 so as to plastically deform only the inner peripheral side of the neutral surface N (see FIG. 11) of the band-shaped metal member 12 (S26: residual stress applying step). .

FIG. 11 is a diagram showing a distribution in the thickness direction of the total stress σ2 obtained by adding a plurality of stresses applied to the band-shaped metal member 12 in the residual stress applying step P9 of FIG. In the residual stress applying step P9, the belt-like metal member 12 is subjected to tensile stress σTC by the fixed roller 67 and moving roller 68 shown by a one-dot chain line in FIG. 11 and by a pressure roller 70 shown by a two-dot chain line in FIG. A bending stress σbC is applied. Further, what is indicated by a long broken line is the residual stress σrA applied to the band-shaped metal member 12 in the circumferential length adjusting step P8 .

  In FIG. 11, the yield region S2 in which the total stress σ2 exceeds the yield stress σy1 of the strip-shaped metal member 12 is a region where strain remains even if the total stress σ2 is removed. In the residual stress applying step P9, the band-shaped metal member 12 is plastically deformed in the circumferential direction so that a part of the inner peripheral side from the neutral surface N is directed toward the inner peripheral side, and the outer peripheral side is elastically deformed from the part. It is said.

From the state described above, the band-shaped metal member 12 is first supplied with hydraulic pressure from the hydraulic source 61 to the second hydraulic chamber 86 via the hydraulic control unit 85, whereby the output rod 76 and the pressurization coupled thereto are supplied. The second load F2 is removed by moving the roller 70 in a direction away from the band-shaped metal member 12 indicated by an arrow e in FIGS. 8 and 10 (S28: retreat step). Thereafter, when the hydraulic pressure is supplied from the hydraulic source 61 to the first hydraulic chamber 62 via the hydraulic control unit 63, the output rod 52 and the moving roller 68 connected thereto are indicated by arrows a in FIGS. The third load F3 is removed by moving in the direction approaching the fixed roller 67 (S30: tension release step). Thereafter, the band-shaped metal member 12 is removed from the fixed roller 67 and the moving roller 68 (S32: removal process).
As a result, the band-shaped metal member 12 becomes a free state and deforms so as to restore the strain to the original state, but the strain remains in a part of the inner peripheral side of the neutral plane N. During the deformation, the inner peripheral portion of the band-shaped metal member 12 is compressed in the circumferential direction toward the inner peripheral side where the residual strain is larger. FIG. 13 shows the distribution in the thickness direction of the residual stress, ie, residual stress σrC, resulting from the stress excluding the residual stress σrA among the residual stress, ie, residual stress σr, in the strip-shaped metal member 12 in the free state. FIG. As shown in FIG. 13, a compressive residual stress is applied to the inner peripheral portion of the band-shaped metal member 12 toward the inner peripheral side. FIG. 14 is a diagram showing the distribution in the thickness direction of the residual stress σr remaining on the band-shaped metal member 12 in the free state. As shown in FIG. 14, a compressive residual stress remains in the inner peripheral portion and the outer peripheral portion of the band-shaped metal member 12 toward the inner peripheral side and the outer peripheral side, and a tensile residual stress remains in the central portion. .

At this time, the moving roller 68 is moved in the direction approaching the fixed roller 67 indicated by the arrow a in FIGS. 8 and 9 to release the third load F3, and then the pressure roller 70 is changed to FIGS. When the second load F2 is released by moving in a direction away from the band-shaped metal member 12 indicated by the arrow e, the residual stress σrA applied to the outer peripheral side of the band-shaped metal member 12 in the circumferential length adjusting step P8 shown in FIG. The present inventor has found out.
That is, in the distribution state of a plurality of stresses applied to the band-shaped metal member 12 shown in FIG. 18, the moving roller 68 is moved in the direction approaching the fixed roller 67 indicated by the arrow a in FIGS. When the three loads F3 are released, the bending stress σbC applied to the band-shaped metal member 12 by the pressure roller 70 shifts to the left as shown in FIG. 18 as the tensile stress σTC by the moving roller 68 disappears. As a result, a portion where the bending stress σbC exceeds the yield stress σy1 (σy0) is generated on the outer peripheral side of the band-shaped metal member 12 (the portion hatched in FIG. 18), and compressive plastic deformation occurs. As a result, as shown in FIG. 19, it is assumed that the residual stress σrA applied to the outer peripheral side of the band-shaped metal member 12 in the peripheral length adjusting step P8 is released (the hatched portion in FIG. 19).
In the step of moving the moving roller 68 in the direction approaching the fixed roller 67 indicated by the arrow a in FIGS. 8 and 9 to release the third load F3, the belt-like metal member 12 is still moved by the electric motor 58. This phenomenon occurs over the entire circumference of the band-shaped metal member 12 because the rotation is made in the direction indicated by the arrow f via 68. In addition, since the outer peripheral side of the band-shaped metal member 12 is plastically stretched in the peripheral length adjusting step P8, even if the bending stress σbC due to the pressure roller 70 does not exceed the yield stress σy1 (σy0), it is easy to plastically shrink, It is assumed that the residual stress σrA applied to the outer peripheral side of the band-shaped metal member 12 is more easily removed.

  According to the manufacturing apparatus (method) of the laminated ring 14 of the present embodiment, at the end of the residual stress applying step P9 in FIG. 4, first, the control device 65 operates the stress applying device 71 to move the pressure roller 70. 8 and 10 is moved away from the band-shaped metal member 12 indicated by an arrow e, thereby removing the second load F2 (S28: retreat step). Thereafter, the control device 65 operates the holding force adjusting device 40 to move the moving roller 68 in the direction approaching the fixed roller 67 indicated by the arrow a in FIGS. 8 and 9, thereby removing the third load F3. (S30: tension release step). By such control of the control device 65, there is no possibility of adversely affecting the residual stress σrA applied to the outer peripheral side of the strip-shaped metal member 12 in the circumferential length adjusting step P8, and the durability of the strip-shaped metal member 12 is improved.

  Returning to FIG. 4, after the residual stress applying step P9, in the aging treatment step P10, the strip metal member 12 is subjected to an aging treatment. In the present embodiment, as the aging treatment, the strip metal member 12 is tempered by heating the strip metal member 12 to a predetermined temperature and holding it for a sufficient time before cooling.

Next, in the nitriding step P11, the band-shaped metal member 12 is subjected to nitriding treatment. In this embodiment, as the nitriding treatment, nitrogen is applied to the surface layer of the band-shaped metal member 12 by heating the band-shaped metal member 12 and holding it in an atmosphere containing a nitriding gas having a predetermined concentration, for example, ammonia decomposition gas, for a predetermined time. Is diffused. FIG. 15 is a diagram showing the distribution in the thickness direction of the residual stress σrN applied to the band-shaped metal member 12 by the nitriding treatment. As shown in FIG. 15, by the nitriding treatment, a large compressive residual stress is left in the inner peripheral portion and the outer peripheral portion of the band-shaped metal member 12 toward the inner peripheral side and the outer peripheral side, respectively, and in the central portion, A tensile residual stress is left. The residual stress σrN shown in FIG. 15 is applied in addition to the residual stress σr applied up to the previous step, so that the distribution in the thickness direction of the residual stress of the band-shaped metal member 12 is as shown in FIG. Distribution.

  Next, in the stacking step P12, a plurality of strip-shaped metal members 12 having different peripheral lengths are stacked in close contact with each other so that the peripheral length increases in order from the inner peripheral side toward the outer peripheral side, thereby forming the stacked ring 14. Is done.

  As described above in detail, according to the manufacturing apparatus (method) of the laminated ring 14 of this embodiment, the belt-shaped metal member 12 wound around the fixed roller 67 and the moving roller 68 is wound around the moving roller 68 while applying tension. By pressing the outer circumferential surface 24 of the band-shaped metal member 12 locally toward the inner circumferential side using the pressure roller 70 provided on the outer circumferential side of the band-shaped metal member 12. Since the roller 70 includes a residual stress applying step P9 for applying a compressive residual stress σrC to the inner peripheral portion of the strip-shaped metal member 12 by the roller 70, the inner peripheral surface 22 of the strip-shaped metal member 12 faces the outer peripheral side in the peripheral length adjusting step P8. Even if the tensile residual stress σrA1 remains in the inner peripheral portion of the strip-shaped metal member 12 by being pressed locally, the compressive residual stress σr is applied to the inner peripheral portion of the strip-shaped metal member 12 in the residual stress applying step P9. Therefore, when the belt-shaped metal member 12 is used as a component of the laminated ring 14 of the transmission belt 10, the residual stress required on the compression side is minimized. Since the strength margin is large (large), the durability of the band-shaped metal member 12 can be enhanced.

  Moreover, according to the manufacturing apparatus (method) of the laminated ring 14 of the present embodiment, at the end of the residual stress applying step P9 in FIG. 4, first, the pressure roller 70 is formed in a belt shape indicated by an arrow e in FIGS. The second load F2 is removed by moving in a direction away from the metal member 12 (S28: retracting step), and then the moving roller 68 is moved in a direction approaching the fixed roller 67 indicated by an arrow a in FIGS. Since the third load F3 is removed (S30: tension release step), there is no possibility of adversely affecting the residual stress σrA applied to the outer peripheral side of the strip-shaped metal member 12 in the circumferential length adjusting step P8, and the strip-shaped metal member 12 durability is improved.

  Moreover, according to the manufacturing apparatus (method) of the laminated ring 14 of the present embodiment, in the residual stress applying step P9, only a part on the inner peripheral side from the neutral surface N of the strip-shaped metal member 12 is plastically deformed. The third load F3 is a tensile stress σTC applied to the band-shaped metal member 12 by the moving roller 68 on the outer peripheral side of the neutral surface N of the band-shaped metal member 12, and the band-shaped metal member 12 by the fixed roller 67 and the moving roller 68. And the residual stress σrA applied to the band-shaped metal member 12 in the circumferential length adjusting step P8 as much as possible within a range smaller than the yield stress σyo of the band-shaped metal member 12. The second load F <b> 2 is controlled so as to increase, and the tension applied to the band-shaped metal member 12 by the moving roller 68 on the inner peripheral side of the neutral surface N of the band-shaped metal member 12. The sum of the force σTC, the bending stress σbC applied to the band-shaped metal member 12 by the pressure roller 70, and the residual stress σrA applied to the band-shaped metal member 12 in the circumferential length adjusting step P8 is the yield of the band-shaped metal member 12. Since the stress is controlled to be as large as possible within a range smaller than the stress σy0, the plastic deformation region (yield region) of the band-shaped metal member 12 in the residual stress applying step P9 becomes a part in the thickness direction. Since the circumference of the metal member 12 is not changed, compressive residual stress is applied to the inner circumference of the band-like metal member 12 without changing the circumference of the belt-like metal member 12 adjusted in the circumference adjustment step P8. Can do.

As mentioned above, although one Example of this invention was described in detail with reference to drawings, this invention is not limited to this Example, It can implement in another aspect.

For example, the band-shaped metal member 12 may be formed from a steel material other than maraging steel and stainless steel.

In addition, the mechanical configurations of the holding force adjusting device 49 and the stress applying device 71 are disclosed as examples, and can be realized even with other known mechanical configurations. For example, as the hydraulic actuator used for moving the moving roller 68 and the pressure roller 70, other types of actuators such as an electric type or a pneumatic type may be used instead.
The residual stress applying device 66 includes a fixed roller 67 and a moving roller 68, and the moving roller 68 includes a holding force adjusting device 49. However, the residual stress applying device 66 includes a pair of moving rollers, and the holding force is applied to both moving rollers. An adjusting device 49 may be provided.

Further, the peripheral length adjusting step P8 and the residual stress applying step P9 do not need to be separate steps, and the peripheral length adjusting step P8 and the residual stress applying step P9 may be performed in one step.
That is, the diameters of the fixed roller 42 and the moving roller 44 of the peripheral length adjusting device 40 used in the peripheral length adjusting step P8, and the diameters of the moving roller 68 and the fixed roller 67 of the residual stress applying device 66 used in the peripheral length adjusting step P8. By making the same, the circumference adjusting device 40 and the residual stress applying device 66 can be used in common. In this case, if the tension set in the tension applying step S22 of the residual stress applying step P9 is released in the tension releasing step S16 of the peripheral length adjusting step P8, the removing step S18 of the peripheral length adjusting step P8, the residual stress. It is possible to omit the setting step S20 and the tension applying step S22 of the applying step P9.
Therefore, it is possible to move to the residual stress applying step P9 without replacing the belt-like metal member 12 after the peripheral length adjusting step P8 is completed. In this case, labor can be omitted and workability is improved.

Further, as shown in FIG. 17, the residual stress application used in the residual stress applying process P9 is compared with the radius rB of the fixed roller 42 and the radius rA of the moving roller 44 of the peripheral length adjusting device 40 used in the peripheral length adjusting process P8. If the radius of the fixed roller 670 of the device 66 and the radius of the moving roller 680 are set large, the residual stress on the inner peripheral surface side of the band-shaped metal member 12 is changed to the radius of the fixed roller 670 of the residual stress applying device 66 and the moving roller 680. This can be improved as compared with the case where the radius is the same as the radius rB of the fixed roller 42 and the radius rA of the moving roller 44 of the circumferential length adjusting device 40. The diameters of the fixed roller 670 and the moving roller 680 of the residual stress applying device 66 are preferably set to 1.2 to 2 times the diameters of the fixed roller 42 and the moving roller 44 of the circumferential length adjusting device 40. .
That is, in the above-described embodiment, when the tension applied to the band-shaped metal member 12 is released in the tension releasing step S30 of the residual stress applying process P9, the tension is generated on the inner peripheral surface side of the band-shaped metal member 12. A portion where the stress slides to the compression side by the amount of the tensile tension and exceeds the yield point −σy (−σy0) occurs, and a portion that undergoes compression plastic deformation occurs. Thereby, there is a possibility that the residual stress in the compressing direction applied to the inner peripheral surface side of the strip-shaped metal member 12 in the residual stress applying step P9 is lost.
However, the radius of the fixed roller 670 and the radius of the moving roller 680 of the residual stress applying device 66 are compared with the radius rB of the fixed roller 42 and the radius rA of the moving roller 44 of the peripheral length adjusting device 40 used in the peripheral length adjusting step P8. By enlarging, the bending stress which acts on the inner peripheral surface side of the band-shaped metal member 12 at the fixed roller 670 and moving roller 680 portions in the residual stress applying step P9 can be reduced. As a result, even if the tension applied to the band-shaped metal member 12 is released and the stress generated on the inner peripheral surface side of the band-shaped metal member 12 slides to the compression side by the tensile tension, the yield point −σy ( There is no risk of occurrence of a portion exceeding -σy0). Accordingly, the residual stress applied in the residual stress applying step P9 remains as it is on the inner peripheral surface side of the band-shaped metal member 12, and the durability of the band-shaped metal member 12 is further improved.

In this case, the fixed roller 42 and the moving roller 44 of the peripheral length adjusting device 40 used in the peripheral length adjusting step P8 should have a smaller diameter than the fixed roller 670 and the moving roller 680 of the residual stress applying device 66. Therefore, the compressive residual stress can be efficiently applied to the outer peripheral portion side of the belt-shaped metal member 12 in the peripheral length adjusting step P8.
The details of the peripheral length adjusting step P8 and the residual stress applying step P9 shown in FIG. 17 are the residual stresses used in the residual stress applying step P9 compared to the diameters of the fixed roller 42 and the moving roller 44 of the peripheral length adjusting device 40. Except for the fact that the diameters of the fixed roller 670 and the moving roller 680 of the applying device 66 are set to be large, they are the same as in the above-described embodiment, and thus the same reference numerals as those in the above-described embodiment are used and description thereof is omitted. .

It should be noted that the above description is merely an embodiment, and other examples are not illustrated. However, the present invention is implemented in variously modified and improved modes based on the knowledge of those skilled in the art without departing from the gist of the present invention. Can do.

DESCRIPTION OF SYMBOLS 10 ... Transmission belt 12 ... Strip | belt-shaped metal member 66 ... Residual stress provision apparatus 67 ... Fixed roller 68 ... Moving roller 69 ... Elastic roller 70 ... Pressure roller 65 ... Control device

Claims (6)

An endless metal ring manufacturing apparatus,
A holding roller disposed on the inner peripheral side of the endless metal ring;
Holding roller moving means capable of moving the holding roller between a position where tension is applied to the endless metal ring by the holding roller and a position where tension is not applied;
An outer peripheral roller disposed on the outer peripheral side of the endless metal ring;
An outer peripheral roller moving means capable of moving the outer peripheral roller between a position where the outer peripheral roller presses the endless metal ring from the outer peripheral side and a position where the endless metal ring is not pressed;
After the outer peripheral side roller is moved to a position where the outer peripheral side roller moving means does not press the endless metal ring, the holding roller moving means moves the holding roller to a position where tension is not applied to the endless metal ring. Control means for controlling
An endless metal ring manufacturing apparatus characterized by comprising: In the manufacturing apparatus of the endless metal ring of Claim 1,
The holding roller is composed of a pair of first holding rollers and a pair of second holding rollers having a diameter larger than that of the first holding roller,
The holding roller moving means is capable of moving the second holding roller;
The control means moves the outer peripheral roller to a position where the outer peripheral roller moving means does not press the endless metal ring, and then the holding roller applies tension to the endless metal ring by the holding roller moving means. An apparatus for manufacturing an endless metal ring, which is controlled so as to be moved to a position where it is not applied. In the manufacturing apparatus of the endless metal ring of Claim 2,
Small-diameter holding roller moving means capable of moving the first holding roller between a position where tension is applied to the endless metal ring by the first holding roller and a position where tension is not applied. An apparatus for manufacturing an endless metal ring. In the manufacturing apparatus of the endless metal ring of Claim 3,
The small-diameter holding roller moving means can apply tension exceeding the yield stress of the endless metal ring to the endless metal ring, and the holding roller moving means is within a range not exceeding the yield stress of the endless metal ring. A device for manufacturing an endless metal ring, wherein tension can be applied to the endless metal ring. A method of manufacturing an endless metal ring,
A holding step of holding the endless metal ring by a holding roller disposed on the inner peripheral side of the endless metal ring;
A residual stress applying step of pressing from the outer peripheral side of the endless metal ring held in the holding step by an outer peripheral side roller;
A retracting step of retracting the outer peripheral side roller from the endless metal ring;
A releasing step of moving the holding roller to release the tension of the endless metal ring;
A process for producing an endless metal ring, comprising: A method of manufacturing an endless metal ring,
A circumferential length adjusting step in which the circumferential length of the endless metal ring is adjusted by a first holding roller disposed on the inner circumferential side of the endless metal ring;
A holding step of holding the endless metal ring by a second holding roller having a diameter larger than that of the first holding roller;
A residual stress applying step of pressing from the outer peripheral side of the endless metal ring held in the holding step by an outer peripheral side roller;
A retracting step of retracting the outer peripheral side roller from the endless metal ring;
A releasing step of releasing the tension of the endless metal ring by moving the second holding roller;
A process for producing an endless metal ring, comprising:

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