Rolling rolls

Abstract

The present invention provides a rolling roll that can suppress the shifting of the inner and outer rings even when strong axial forces are applied during attachment or detachment to the rolling mill. [Solution] A rolling roll comprising an inner ring forming an annular shape centered on an axis, and an outer ring located on the outer circumference of the inner ring and made of a material with higher hardness than the inner ring. The outer ring has a rolling portion on its outer circumference, and the outer circumference of the inner ring and the inner circumference of the outer ring are tapered surfaces inclined with respect to the axial direction. The inner ring is press-fitted into the outer ring, and a recess is provided on the side of the rolling roll located on the smaller diameter side of the inner ring, overlapping both the outer and inner rings when viewed in the axial direction. A plate is fixed within the recess, overlapping both the outer and inner rings when viewed in the axial direction.

Description

Technical Field

[0001] The present invention relates to a rolling roll.

Background Art

[0002] Conventionally, as a rolling roll for a rolling mill, a rolling roll having a configuration in which only the outer peripheral portion that comes into contact with a workpiece during rolling is a ring made of cemented carbide, and a ring made of cast iron is press-fitted into the inner peripheral portion thereof is known (see Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of Invention

Problems to be Solved by the Invention

[0004] In the rolling roll of the above configuration, the outer layer ring and the inner layer ring are relatively firmly fixed. However, for example, when a force that strongly pushes only one of the outer layer ring and the inner layer ring in the axial direction acts on the rolling roll during attachment to or detachment from a rolling mill, there is a possibility that the inner layer ring and the outer layer ring are displaced from each other in the axial direction.

[0005] An object of the present invention is to provide a rolling roll capable of suppressing the inner layer ring and the outer layer ring from being displaced from each other even when a strong axial force acts during attachment to or detachment from a rolling mill or the like.

Means for Solving the Problems

[0006] (1) A rolling roll comprising an annular inner ring centered on an axis, and an outer ring located on the outer circumference of the inner ring and made of a material with higher hardness than the inner ring, wherein the outer ring has a rolling portion on its outer surface, the outer surface of the inner ring and the inner surface of the outer ring are tapered surfaces inclined with respect to the axial direction, the inner ring is press-fitted into the outer ring, and a recess is provided on the side surface of the rolling roll located on the smaller diameter side of the inner ring, overlapping both the outer ring and the inner ring when viewed in the axial direction, and a plate is fixed in the recess, overlapping both the outer ring and the inner ring when viewed in the axial direction.

[0007] (2) In (1), the plate may be configured to be screwed to the inner layer ring.

[0008] (3) In (1) or (2), the recess may be a groove that extends circumferentially at a position that spans both the outer ring and the inner ring when viewed in the axial direction, and the plate may be configured to be an annular shape extending along the groove.

[0009] (4)(3) The annular plate may be configured to be screwed to the inner layer ring at four locations in the circumferential direction.

[0010] (5) In any one of (1) to (4), the outer surface of the inner layer ring and the inner surface of the outer layer ring may be bonded together with an adhesive. [Effects of the Invention]

[0011] According to one aspect of the present invention, a rolling roll is provided that can suppress the displacement of the inner and outer rings due to the axial force applied when attaching or detaching the roll from the rolling mill. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 is a longitudinal cross-sectional view of the rolling roll of the embodiment. [Figure 2]Figure 2 is an exploded view of the rolling rolls of the embodiment. [Figure 3] Figure 3 is a side view of the rolling roll of the embodiment, viewed from the axial direction. [Figure 4] Figure 4 is a partial cross-sectional view showing the rolling rolls of the embodiment mounted on a rolling mill. [Modes for carrying out the invention]

[0013] Figure 1 is a longitudinal cross-sectional view of the rolling roll of the embodiment. Figure 2 is an exploded view of the rolling roll of the embodiment. Figure 3 is a side view of the rolling roll of the embodiment as seen from the axial direction. The rolling roll 10 comprises an outer ring 11 located on the outer circumference, an inner ring 12 located on the inner circumference, a plate 13 located on the side of the rolling roll 10, and a plurality of screws 14 that fix the plate 13 to the inner ring 12.

[0014] The outer ring 11 is made of cemented carbide and is a substantially cylindrical member centered on the central axis O. The outer ring 11 is made of a material with higher hardness than the inner ring 12. A rolling section 15, which is a groove for rolling the metal material to be worked, is formed on the outer circumferential surface 11a of the outer ring 11. The inner circumferential surface 11b of the outer ring 11 is tapered, with the inner diameter decreasing from one end face 11c to the other end face 11d. The inner circumferential surface 11b of the outer ring 11 is a tapered surface inclined with respect to the axial direction. The taper angle θ of the inner circumferential surface 11b (see Figure 2) is set in the range of 0°10′ to 2°00′ with respect to the central axis O. The outer ring 11 has an annular notch 11e when viewed from the direction of the central axis O at the corner between the inner circumferential surface 11b and the end face 11d, which is located on the side of the inner circumferential surface 11b with a smaller inner diameter.

[0015] The inner ring 12 is made of, for example, steel. The inner ring 12 is a substantially cylindrical member centered on the central axis O. The length of the inner ring 12 in the direction of the central axis O is the same as the length of the outer ring 11 in the direction of the central axis O. The outer circumferential surface 12a of the inner ring 12 is formed in a tapered shape, with the outer diameter decreasing from one end face 12c to the other end face 12d. The outer circumferential surface 12a of the inner ring 12 is a tapered surface inclined with respect to the axial direction. The taper angle of the outer circumferential surface 12a of the inner ring 12 is the same as the taper angle θ of the inner circumferential surface 11b of the outer ring 11. The average outer diameter of the inner ring 12 is slightly larger than the average inner diameter of the outer ring 11. The difference between the average outer diameter of the inner ring 12 and the average inner diameter of the outer ring 11 is, for example, within the range of 0.01% to 0.1% of the average inner diameter of the outer ring 11. The inner ring 12 has an annular notch 12e at the corner between the inner circumferential surface 12b and the end face 12c, located on the side of the outer circumferential surface 12a with a smaller outer diameter, when viewed in the direction of the central axis O. Multiple screw holes 12h are provided on the surface 12f of the notch 12e that faces in the direction of the central axis O.

[0016] In the inner ring 12, a notch 12e is provided at the corner on the outer circumference of the inner ring 12. As a result, the inner ring 12 has a small-diameter portion 12A on the inner circumference side of the notch 12e. The small-diameter portion 12A is a cylindrical portion having a diameter smaller than the outer diameter of the inner ring 12. Because the small-diameter portion 12A is provided, the length of the inner surface 12b of the inner ring 12 in the direction of the central axis O matches the length of the inner ring 12 in the direction of the central axis O. This ensures an effective width of internal pressure (compression allowance) when setting the rolling roll 10 on the shaft 21 (see Figure 4) of the rolling mill 20 described later, and ensures the fixing force of the rolling roll 10.

[0017] The plate 13 is an annular plate-shaped member centered on the central axis O. The plate 13 is disposed inside a recessed groove 10a (details of which will be described later) located on the side surface of the rolling roll 10. The plate 13 has a plate groove 13b that opens on one plate surface 13a. As shown in FIG. 3, the plate groove 13b has an annular shape when viewed in the direction of the central axis O. Through holes 13c penetrating the plate 13 in the direction of the central axis O are formed at a plurality of positions (four positions in the present embodiment) on the bottom surface of the plate groove 13b.

[0018] In the rolling roll 10, the inner layer ring 12 is press-fitted into the inner periphery of the outer layer ring 11. Specifically, in the manufacturing process of the rolling roll 10, first, an adhesive of methacrylate-based resin is applied to the inner peripheral surface 11b of the outer layer ring 11 and the outer peripheral surface 12a of the inner layer ring 12. At this time, it is desirable that the adhesive be applied as uniformly as possible to the inner peripheral surface 11b and the outer peripheral surface 12a. In addition, the adhesive has a shear strength of 4.9 N / mm 2 or higher, and an adhesive of methacrylate-based resin containing, for example, a methacrylate ester as a main component is preferably used. In this state, the end face with the smaller outer diameter of the inner layer ring 12 is inserted from the end face with the larger inner diameter of the outer layer ring 11, and the inner layer ring 12 is fitted into the inner periphery of the outer layer ring 11.

[0019] After the inner peripheral surface 11b of the outer layer ring 11 and the outer peripheral surface 12a of the inner layer ring 12 come into contact with each other, pressure is further applied in the fitting direction to press-fit the inner layer ring 12 into the inner periphery of the outer layer ring 11. At this time, since the average outer diameter of the inner layer ring 12 is set to be slightly larger than the average inner diameter of the outer layer ring 11, a constant interference is provided on the surfaces where the outer layer ring 11 and the inner layer ring 12 are in contact with each other. At the position where the positions of the end face 11c of the outer layer ring 11 and the end face 12d of the inner layer ring 12 in the direction of the central axis O coincide with each other by press-fitting, the inner peripheral surface 11b of the outer layer ring 11 and the outer peripheral surface 12a of the inner layer ring 12 are integrated by the surface pressure due to the interference and the adhesive force of the adhesive.

[0020] By press-fitting and integrating the outer layer ring 11 and the inner layer ring 12, the notch portion 11e of the outer layer ring 11 and the notch portion 12e of the inner layer ring 12 are arranged to be continuous in the radial direction. As a result, an annular recessed groove 10a (recess portion) extending in the circumferential direction is formed on the side surface of the rolling roll 10. The recessed groove 10a overlaps both the outer layer ring 11 and the inner layer ring 12 when viewed in the direction of the central axis O. The boundary between the outer layer ring 11 and the inner layer ring 12 is located at the bottom surface of the recessed groove 10a.

[0021] The plate 13 is arranged inside the recessed groove 10a. The depth of the recessed groove 10a in the central axis O direction is substantially equal to the thickness of the plate 13 in the central axis O direction. The depth of the recessed groove 10a may be greater than the thickness of the plate 13. Further, when viewed in the central axis O direction, the width of the plate 13 is substantially equal to the width of the recessed groove 10a. The through hole 13c of the plate 13 is positioned with respect to the screw hole 12h of the inner layer ring 12, and the screw 14 is tightened into the screw hole 12h through the through hole 13c. As a result, the plate 13 is screwed to the inner layer ring 12. Since the plate 13 has a width substantially equal to that of the recessed groove 10a, the plate 13 is arranged to overlap both the outer layer ring 11 and the inner layer ring 12 when viewed in the central axis O direction.

[0022] The rolling roll 10 having the above configuration is used by being fixed to a cantilever-type rolling mill 20 as shown in Figure 4. Figure 4 is a partial cross-sectional view showing a state where the rolling roll of the embodiment is mounted on the rolling mill. The rolling mill 20 has a substantially cylindrical shaft 21 formed of, for example, steel material and extending along the central axis O. The base end side (A side; left side in Figure 4) of the shaft 21 is connected to an unillustrated output shaft. The shaft 21 includes a multi-stage cylindrical small-diameter portion 22 located at the end on the tip end side (B side; right side in Figure 4) of the shaft 21, and a tapered shaft 23 connected to the shaft base end side of the small-diameter portion 22 and having an outer diameter that decreases toward the shaft tip end side.

[0023] A tapered sleeve 24, made of, for example, steel, is attached to the tapered shaft 23 from the shaft tip side. The tapered sleeve 24 has a tapered hole 25 whose inner diameter increases towards the shaft base end, and the inner circumferential surface of the tapered hole 25 fits with the outer circumferential surface of the tapered shaft 23. The outer circumferential surface of the tapered sleeve 24 is a cylindrical surface parallel to the central axis O in the portion where the tapered hole 25 is provided, and the wall thickness of the tapered sleeve 24 is formed to become thinner towards one end. An insertion hole 26 extending coaxially with the tapered hole 25 is provided on the shaft tip side of the tapered sleeve 24, and the small diameter portion 22 of the shaft 21 is inserted into the insertion hole 26.

[0024] With the rolling roll 10 positioned on the outer circumference of the tapered sleeve 24, the tapered sleeve 24 is pushed toward the shaft base end. The tapered shaft 23 deforms the tapered sleeve 24 so that it expands radially outward. The tapered sleeve 24 presses the inner surface of the rolling roll 10 in a direction that expands radially outward, and the rolling roll 10 is fixed to the outer circumference of the tapered sleeve 24.

[0025] During continuous rolling, the rotation of the output shaft causes the shaft 21, tapered sleeve 24, and rolling roll 10 to rotate together, and the rolling portion 15 of the rolling roll 10 processes the metal material being worked on.

[0026] In the rolling roll of this embodiment, the outer ring 11 and the inner ring 12 are integrated by fitting their tapered surfaces together, and furthermore, a plate 13 is fixed to the smaller diameter end of the inner ring 12, overlapping both the outer ring 11 and the inner ring 12 when viewed in the direction of the central axis O. This configuration makes it possible to suppress misalignment between the outer ring 11 and the inner ring 12 in the rolling roll 10. Specifically, for example, when attaching the rolling roll 10 to the rolling mill 20, when the tapered sleeve 24 is driven into the inner circumference side of the inner ring 12, a force acts to peel the contact surfaces of the outer ring 11 and the inner ring 12 apart in the axial direction. In the example shown in Figure 4, since the smaller diameter side of the inner ring 12 is positioned towards the shaft tip, the outer ring 11 is difficult to move toward the shaft base end, but it is easy to move toward the shaft tip because the tapered surface fitting is disengaged in that direction. In contrast, in the rolling roll 10 of this embodiment, since the plate 13 is fixed to the smaller diameter side of the inner ring 12, it is possible to prevent the outer ring 11 from moving toward the shaft tip side as shown in Figure 4. In addition to the above, it is also possible that only the side surface of the outer ring 11 may be pushed with a tool or the like in order to move the rolling roll 10 in the direction of the central axis O. Even in such cases, the rolling roll 10 of this embodiment can suppress the occurrence of misalignment between the outer ring 11 and the inner ring 12.

[0027] In the rolling roll 10 of this embodiment, a plate 13 is positioned in a groove 10a on the side of the rolling roll 10, and the heads of the screws 14 that fix the plate 13 are positioned within the plate grooves 13b of the plate 13. As a result, the plate 13 and the screws 14 do not protrude from the side of the rolling roll 10, so they do not interfere with the components of the rolling mill 20 and can be used in the same way as conventional rolling rolls.

[0028] In this embodiment, the rolling roll 10 is constructed by integrating two components, an outer ring 11 and an inner ring 12. This allows for a lighter rolling roll compared to one integrally formed from cemented carbide, making it easier to handle. Furthermore, since the inner ring 12 of the rolling roll 10 is made of steel, if the tapered sleeve 24 and tapered shaft 23 are also made of steel, as in the rolling mill 20 of this embodiment, the frictional force with the tapered sleeve 24 is improved compared to a rolling roll integrally formed from cemented carbide, preventing slippage during rotation of the tapered sleeve 24. In addition, even if the cemented carbide outer ring 11 is worn or damaged, only the outer ring 11 can be replaced, and the inner ring 12 can be reused.

[0029] Although embodiments of the rolling roll 10 and rolling mill 20 of the embodiment have been described in detail above, the present invention is not limited to these embodiments without departing from the technical spirit of the present invention. For example, in this embodiment, an adhesive is applied to the joint surface between the outer ring 11 and the inner ring 12. However, if sufficient joint strength can be obtained with tapered fitting alone, the adhesive does not need to be used. By using an adhesive in combination, it becomes unnecessary to apply a large surface pressure to the inner circumferential surface 11b of the outer ring 11, thereby reducing the tensile stress on the outer ring 11 and making it easier to prevent damage to the outer ring 11.

[0030] In this embodiment, an annular plate groove 13b is provided on one side of the plate 13, but countersunk holes may be provided at the positions of the screws 14. In this embodiment, a ring-shaped plate 13 is used, but the plate 13 may be divided into multiple plates. Even when multiple plates are used, if these plates are arranged to overlap both the outer ring 11 and the inner ring 12 when viewed in the direction of the central axis O, the misalignment of the outer ring 11 and the inner ring 12 can be suppressed.

[0031] In this embodiment, the plate 13 is screwed to the inner ring 12, but the method of fixing the plate 13 is not limited to screwing. For example, a method of fixing by inserting a pin in the radial direction can be used. Also, when using multiple small plates, the plates may be slid radially to position them so that they overlap with the outer ring 11 and the inner ring 12. [Explanation of Symbols]

[0032] 10... Rolling rolls 10a…concave groove 11…Outer ring 11a, 12a...outer surface 11b, 12b…Inner peripheral surface 11c,11d,12c,12d...end face 11e, 12e... Notches 12…Inner ring 12f…plane 12h... screw hole 12A…Small diameter part 13... Plate 13a...Plate surface 13b...Plate groove 13c...Through hole 14... screw 15...Rolling section 20...Rolling mill 21…Shaft 22…Small diameter part 23…Tapered shaft 24... Tapered sleeve 25... Tapered hole 26…Through hole O…Central axis line θ... Taper angle

Claims

1. A rolling roll comprising an inner ring forming an annular shape centered on an axis, and an outer ring located on the outer circumference of the inner ring and made of a material with higher hardness than the inner ring, The outer layer ring has a rolled portion on its outer circumferential surface, The outer circumferential surface of the inner ring and the inner circumferential surface of the outer ring are tapered surfaces inclined with respect to the axial direction, and the inner ring is press-fitted into the outer ring. A recess is provided on the side surface of the rolling roll located on the smaller diameter side of the inner ring, such that it overlaps both the outer ring and the inner ring when viewed in the axial direction. A rolling roll in which a plate is fixed within the recess, overlapping both the outer ring and the inner ring when viewed in the axial direction.

2. The plate is screwed to the inner ring. The rolling roll according to claim 1.

3. The recess is a groove that extends circumferentially at a position that spans both the outer ring and the inner ring when viewed in the axial direction. The plate is an annular plate extending along the groove. The rolling roll according to claim 1 or 2.

4. The annular plate is screwed to the inner layer ring at four points in the circumferential direction. The rolling roll according to claim 3.

5. The outer circumferential surface of the inner ring and the inner circumferential surface of the outer ring are bonded together with an adhesive. The rolling roll according to claim 1 or 2.

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