JP4964207B2 - Endless strip metal ring rolling equipment - Google Patents

Description

  The present invention relates to a rolling device for an endless belt-like metal ring used for a power transmission belt of an automobile continuously variable transmission (CVT) or the like.

  A laminated ring used for a power transmission belt or the like employed in a continuously variable transmission of an automobile is obtained by laminating a plurality of endless metal rings having different circumferential lengths in the thickness direction. The endless belt-like metal ring is formed by welding ends of thin metal plates such as maraging steel, which is a super-strength steel, to form a cylindrical drum, which is then solutionized and partially heated by the heat during the welding. The drum having a uniform hardness is cut and the resulting endless metal ring is rolled to a predetermined circumference.

  Conventionally, an apparatus shown in FIG. 4 is known as a rolling apparatus for the endless metal ring (see, for example, Patent Document 1). An endless belt-shaped metal ring rolling device 41 shown in FIG. 4 includes a fixed roller 2a, a tension roller 2b, a mesh roller 3 disposed between the rollers 2a and 2b, and a mesh roller. 3 and a reduction receiving roller 4 that rolls with a metal ring W interposed therebetween. The fixed roller 2a and the tension roller 2b have the same diameter, and the tension roller 2b is freely displaceable in a direction away from the fixed roller 2a. Further, the mesh roller 3 has a smaller diameter than the fixed roller 2a and the tension roller 2b, and is pressed in the direction of the pressure receiving roller 4 by the larger diameter pressing roller 9.

  According to the rolling device 41, the mesh roller 3 is pressed in the direction of the reduction roller 4 via the reduction roller 9 while the metal ring W wound around the fixed roller 2a and the tension roller 2b is rotated in the direction of the arrow. Thus, the metal ring W is rolled between the mesh roller 3 and the reduction receiving roller 4. At the same time, the rolling device 41 displaces the tension roller 2b in a direction away from the fixed roller 2a, and maintains the state in which the rolled metal ring W is wound around the rollers 2a and 2b. Then, the circumference of the rolled metal ring W is calculated from the displacement of the tension roller 2b. As a result, according to the rolling device 1, the metal ring W can be rolled to have a desired circumference.

  At this time, the fixed roller 2a is located on the downstream side of the pressure-reducing roller 4 along the traveling direction of the metal ring W that circulates between the fixed roller 2a and the tension roller 2b. As shown in FIG. 2, a first tangent line P that contacts the outer peripheral surfaces of both the fixed roller 2 a and the reduction roller 4 on the metal ring W, and the fixed roller 2 a and the tension roller 2 b on the reduction roller 4 side, And the second tangent line Q that is in contact with the outer peripheral surface intersects with an angle θ, and the rolling device 41 sets the angle θ = 2.81 °.

However, according to the conventional rolling apparatus 41, the metal ring W after rolling may not be a perfect circle but may have a distorted shape, and an improvement is desired.
Japanese Patent No. 3609338

  In view of such circumstances, an object of the present invention is to provide an endless belt-shaped metal ring rolling device capable of obtaining a metal ring having a shape close to a perfect circle after rolling.

  The present inventors diligently studied why the rolled metal ring W does not become a perfect circle but has a distorted shape in the conventional rolling device 41. As a result, in the rolling apparatus 41, the greater the angle θ formed between the first tangent line P and the second tangent line Q shown in FIG. 2, the greater the distortion of the metal ring W after rolling. I found out.

  As a result of further investigation based on the above knowledge, the present inventors set the angle formed by the first tangent line P and the second tangent line Q to a range of 1 ° or less, thereby forming a shape close to a perfect circle after rolling. The present inventors have found that a metal ring can be obtained and completed the present invention.

  Therefore, in order to achieve the above object, the present invention provides a pair of tension rollers having the same diameter around which an endless belt-shaped metal ring is wound, and a center roller having a smaller diameter than both tension rollers. A rolling roller for holding the metal ring between the center roller and rolling, and a pressing means for pressing the center roller in the direction of the rolling roller. A first tangent line that contacts the outer peripheral surfaces of both the tension roller and the rolling roller downstream of the rolling roller along the traveling direction of the metal ring that circulates between the metal ring and the rolling roller side The angle formed by the second tangent line that contacts the outer peripheral surfaces of both tension rollers is in the range of 1 ° or less.

  According to the rolling apparatus of the present invention, since the angle formed by the first tangent and the second tangent is in the range of 1 ° or less, the endless belt-shaped metal ring having a shape close to a perfect circle is obtained after rolling. Obtainable.

  Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is a front view showing a configuration of an endless metal ring rolling device according to the present embodiment, FIG. 2 is an explanatory view showing a positional relationship of each roller in the rolling device, and FIG. 3 is a rolling device shown in FIG. It is a top view which shows the shape of the metal ring rolled by this.

  As shown in FIG. 1, the rolling apparatus 1 of the present embodiment includes a fixed roller 2 a and a tension roller 2 b as tension rollers around which an endless metal ring W is wound, and a center disposed between the rollers 2 a and 2 b. A mesh roller 3 as a roller, and a reduction receiving roller 4 as a rolling roller that sandwiches and rolls a metal ring W between the mesh roller 3 are provided.

  The fixed roller 2a and the pulling roller 2b have the same diameter, and are provided with a predetermined interval in the horizontal direction so that the metal ring W is wound around. The fixed roller 2a is rotationally driven by a motor (not shown). The tension roller 2b is supported by a shaft support member 6 attached to the tip of the cylinder rod 5a of the tension cylinder 5, and is freely displaceable in a direction away from the fixed roller 2a by the tension cylinder 5.

  The shaft support member 6 is slidable along the rail member 7. The rail member 7 is provided with a burr limit 8, and the burr limit 8 detects the displacement of the tension roller 2 b from the displacement of the shaft support member 6.

  The mesh roller 3 has a smaller diameter than the fixed roller 2a and the tension roller 2b, and is pressed in the direction of the pressure receiving roller 4 having a diameter larger than that of the fixed roller 2a and the tension roller 2b when the pressure roller 9 as a pressing unit is pressed. The The reduction roller 9 has a larger diameter than the fixed roller 2 a and the tension roller 2 b, and is supported by a shaft support member 11 attached to the tip of the cylinder rod 10 a of the reduction cylinder 10. It comes to be pressed. The reduction roller 9 includes a groove portion 12 along the outer peripheral surface, and the metal ring W passes through the groove portion 12 and circulates between the fixed roller 2a and the tension roller 2b.

  The rolling device 1 receives the mesh roller 3 via the reduction roller 9 while rotating the metal roller W in the direction of the arrow between the fixed roller 2a and the tension roller 2b by rotating the fixed roller 2a. By pressing in the direction of the roller 4, the metal ring W is rolled between the mesh roller 3 and the reduction receiving roller 4. At the same time, the rolling device 1 displaces the tension roller 2b in the direction away from the fixed roller 2a, and maintains the state in which the rolled metal ring W is wound around the rollers 2a and 2b. Then, the displacement of the tension roller 2b is detected from the displacement of the shaft support member 6 by the burr limit 8, and the circumference of the rolled metal ring W is calculated from the displacement of the tension roller 2b. As a result, according to the rolling device 1, the metal ring W can be rolled to have a desired circumference.

  At this time, the fixed roller 2a is located on the downstream side of the pressure-reducing roller 4 along the traveling direction of the metal ring W that circulates between the fixed roller 2a and the tension roller 2b. Then, as shown in FIG. 2, the first tangent line P that contacts the outer peripheral surface of the fixed roller 2a and the reduction roller 4 on the metal ring W, and the fixed roller 2a and the tension roller 2b on the side of the reduction roller 4 Intersects with the second tangent line Q in contact with the outer peripheral surface at an angle θ.

  In the rolling device 1 of the present embodiment, the angle θ is in the range of 1 ° or less, for example, 0.56 °. FIG. 3 shows the shape of the metal ring W rolled by the rolling device 1 when the angle θ = 0.56 °. For comparison, FIG. 5 shows the shape of a metal ring W rolled by a conventional rolling device 41 having an angle θ = 2.81 °.

  3 and 5, the angle θ is 1 as compared to the metal ring W rolled by the conventional rolling device 41 having a size exceeding 1 °, which is distorted from a perfect circle. It is apparent that the metal ring W rolled by the rolling device 1 of the present embodiment having a size of less than or equal to ° has a shape close to a perfect circle.

The front view which shows the structure of the rolling apparatus of the endless strip-shaped metal ring of this invention. Explanatory drawing which shows the positional relationship of each roller in a rolling apparatus. The top view which shows the shape of the metal ring rolled by the rolling apparatus shown in FIG. The front view which shows typically the structure of the rolling apparatus of the conventional endless strip-shaped metal ring. The top view which shows the shape of the metal ring rolled by the rolling apparatus shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rolling apparatus, 2a, 2b ... Tension roller, 3 ... Center roller, 4 ... Rolling roller, 9 ... Pressing means, P ... 1st tangent, Q ... 2nd tangent, W ... Metal ring.

Claims (1)

A pair of tension rollers having the same diameter around which an endless belt-shaped metal ring is wound, a center roller having a smaller diameter than both tension rollers, and a center roller sandwiched between the tension rollers. In a rolling apparatus for a metal ring comprising a rolling roller for rolling and a pressing means for pressing the center roller in the direction of the rolling roller,
A first tangent line that contacts the outer peripheral surfaces of both the tension roller and the rolling roller on the downstream side of the rolling roller along the traveling direction of the metal ring that circulates between both tension rollers on the metal ring; An rolling machine for an endless strip-shaped metal ring, characterized in that an angle formed with a second tangent line in contact with the outer peripheral surfaces of both tension rollers on the rolling roller side is in a range of 1 ° or less.

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