JP2012132487A - Rotary roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary roll having a shaft part which is hardly completely broken even if partial breakage such as a crack is produced therein and is excellent in durability, simply and at low cost.SOLUTION: In the rotary roll 10 provided with a roll body 11, and a shaft part 12 inserted into at least one end of the roll body 11 and fixed to the roll body 11, the shaft part 12 includes an outer layer material 13, and a core material 14 disposed in the outer layer material 13 along the axial direction and made of a material larger in tensile strength than the outer layer material 13.

Description

  The present invention relates to an industrial rotary roll used for conveying, winding and the like of a long sheet-like material such as a resin film.

  For example, various rotating rolls such as a take-up roll, a guide roll, and a nip roll are employed in a manufacturing process and a processing process of a sheet-like material such as a resin film. Also, in a hot rolling process of a steel plate, a transfer roll that transfers the steel plate is used.

Such industrial rotary rolls generally have a configuration including a roll body that is a rotary body and shaft portions that are positioned at both ends thereof. In the shaft portion of such a rotating roll, breakage due to wear or metal fatigue may be recognized as the service period elapses. Such breakage of the shaft portion leads to dropping of the rotating roll, which is not preferable for safety.
Thus, for example, Patent Document 1 describes a method for improving the wear resistance of the clutch portion by using a specific material for the clutch portion of the roll shaft portion (shaft portion). Further, Patent Document 2 discloses a technique for introducing an on-line crack inspection and predicting fatigue breakage of the roll shaft portion.

JP-A-6-304612 JP 2010-162580 A

However, the method described in Patent Document 1 is a method of manufacturing a roll by casting a clutch portion with graphite cast iron, which takes time.
Further, the method described in Patent Document 2 requires online crack inspection, and it is necessary to prepare an inspection device separately.

  The present invention has been made in view of the above circumstances, and even if partial breakage such as cracks occurs, it is difficult to completely break a rotating roll provided with a shaft portion with excellent durability, which is simple and low cost. Is to provide in.

The rotating roll of the present invention is a rotating roll including a roll body and a shaft portion that is fitted into at least one end of the roll body and is fixed to the roll body. The shaft portion includes an outer layer material and the outer layer material. And a core member made of a material having a tensile strength higher than that of the outer layer material.
It is preferable that the core material is disposed at at least one of a position on the axis of the shaft portion and a position symmetrical to the axis.
It is preferable that the shaft portion is obtained by inserting the core material into a hollow portion of the outer layer material formed by drilling.

  ADVANTAGE OF THE INVENTION According to this invention, even if partial breakage, such as a crack, arises, the rotary roll provided with the shaft part which was hard to break completely and was excellent in durability can be provided simply and at low cost.

They are (a) partial cross section side view which shows an example of the rotary roll of this invention, and sectional drawing which follows the I-I 'line of (b) (a). It is radial direction sectional drawing which shows another example of the rotating roll of this invention. It is radial direction sectional drawing which shows another example of the rotating roll of this invention.

Hereinafter, the rotating roll of the present invention will be described in detail.
FIG. 1 illustrates a rotary roll 10 such as a nip roll provided in a longitudinal stretching machine for stretching a resin film as one embodiment of the present invention, (a) a partial sectional side view, and (b). It is sectional drawing (radial direction sectional drawing) which follows the II 'line of (a).

The rotary roll 10 of this example includes a cylindrical roll main body 11 and a pair of shaft portions 12 provided at both ends in the longitudinal direction of the roll main body 11 so that the axis of the roll main body 11 coincides. ing.
The roll body 11 is made of a material such as a carbon steel pipe for machine structure (STKM), for example.

  Each shaft portion 12 is fixed to the roll main body 11 in a state in which the shaft portion 12 is inserted into the end of the roll main body 11 up to the middle in the longitudinal direction. In this example, of each shaft portion 12, the fixing portion F that is fitted into the end portion of the roll body 11 and is fixed to the inner peripheral surface of the roll body 11 protrudes outward from the end portion of the roll body 11. The diameter is larger than the protrusion P. The protruding portion P is a portion that is pivotally supported by a bearing (not shown) when the rotary roll 10 is installed in a factory or the like as a take-up roll, for example.

The shaft portion 12 includes an outer layer material 13 that constitutes a portion including the outer surface of the shaft portion 12, and a single core material 14 disposed in the outer layer material 13 along the axial direction. In the shaft portion 12 of this example, a single rod-like core material 14 is inserted into the hollow portion 13a of the tubular outer layer material 13 in which the hollow portion 13a is formed by being drilled along the longitudinal direction. Is formed by being fixed. The core member 14 is disposed over the entire length of the shaft portion 12 at a position on the axis of the shaft portion 12.
The core material 14 is formed of a material having a higher tensile strength than the outer layer material 13.

  The materials of the outer layer material 13 and the core material 14 may be combined so that the tensile strength of the core material 14 is greater than that of the outer layer material 13. For example, the outer layer material 13 is made of carbon steel, and the core material 14 is made of a titanium alloy. Since carbon steel and titanium alloys each have a plurality of different compositions, these may be appropriately selected and combined so that the tensile strength of the core material 14 is greater than that of the outer layer material 13. Other examples include a combination in which the material of the outer layer material 13 is carbon steel and the material of the core material 14 is chromium molybdenum steel.

  Thus, the shaft part 12 is disposed along the axial direction in the outer layer material 13 constituting the portion including the outer surface of the shaft part 12, and has a higher tensile strength than the outer layer material 13. If the shaft portion 12 has a double structure including the core member 14, even if a partial breakage such as a crack occurs in the shaft portion 12, the shaft portion 12 is not easily broken and has excellent durability. It can be. By providing the shaft portion 12 that is not easily broken, the rotary roll 10 can be prevented from dropping.

That is, if the shaft portion does not have such a core material and is formed of a single member, once the shaft portion is partially damaged due to metal fatigue or the like, the damage Continuously progresses and expands, with the result that the shaft may be completely broken and the rotating roll may fall from the bearing.
On the other hand, in the case of the shaft portion 12 in which the core member 14 made of a material having a higher tensile strength than the outer layer material 13 is disposed inside the outer layer material 13 as in the example of FIG. In the outer layer material 13 having a lower tensile strength than that of the core material 14, first, damage due to the above or the like occurs as a crack on the outer surface. Thus, the crack generated in the outer layer material 13 expands toward the center side of the shaft portion 12 and is considered to easily reach the boundary portion between the outer layer material 13 and the core material 14. However, since the core material 14 is formed of a material having a higher tensile strength than the outer layer material 13, cracks that reach the boundary portion between the outer layer material 13 and the core material 14 have a higher tensile strength. It does not extend continuously.
Therefore, the operator can stop the operation of the rotary roll 10 before the crack reaches the core material 14 after visually confirming the crack generated in the outer layer material 13. Thereby, it is possible to prevent the core material 14 from being completely broken and the rotating roll 10 from falling from the bearing.

The shaft portion 12 in the example of FIG. 1 is formed, for example, by forming a hollow portion 13a with a drill or the like in a shaft made of a conventional solid member that does not include a core material to form an outer layer material 13. It can be manufactured by, for example, a method in which a core material 14 having substantially the same diameter as the hollow portion 13a is inserted into the hollow portion 13a. The hollow portion 13a and the core member 14 are preferably fixed by so-called “shrink fitting” or the like.
Since such a manufacturing method is a method for improving an existing shaft, the shaft portion 12 having excellent durability can be obtained simply and at low cost.

In FIG. 1, an example in which one core member 14 is disposed at a position on the axis of the shaft portion 12 as the shaft portion 12 is illustrated, but the core member 14 is not limited to one, and a plurality of core members 14 are disposed. May be.
For example, as shown in FIG. 2, an even number of core members 14 are disposed at positions symmetrical to each other with respect to the axis of the shaft portion 12, or as shown in FIG. 3 with respect to the axis of the shaft portion 12. And a total of an odd number of core members 14 including an even number of core members 14 disposed at positions symmetrical to each other and a single core member 14 disposed at a position on the axis of the shaft portion 12. Etc. When a plurality of core members 14 are arranged as shown in FIGS. 2 and 3, the durability of the shaft portion 12 is further improved. Further, in these illustrated examples, since the core member 14 is arranged symmetrically with respect to the axis of the shaft portion 12, there is no fear of eccentricity due to the arrangement of the core member 14. Moreover, the diameter of each core material 14 may not be the same diameter as long as eccentricity does not arise.

  In FIG. 1, as the shaft portion 12, a protruding portion in which the diameter of the fixing portion F that is fitted into the end portion of the roll body 11 and is fixed to the roll body 11 protrudes outward from the end portion of the roll body 11. Although the form larger than the diameter of P was illustrated, these may be the same diameter and there is no restriction | limiting in particular.

Further, in FIG. 1, as the rotary roll 10, a double-supported rotary roll in which a pair of shaft portions 12 are provided at both ends of the roll main body 11 is illustrated, but the shaft is provided only at one end of the roll main body. A cantilevered rotating roll provided with a portion may be used.
Moreover, as the roll main body 11, although the cylindrical thing was illustrated over the full length, as long as the shaft part 12 is a form which can be inserted in at least one end, there is no restriction | limiting in the form.

  Moreover, as a use of the rotating roll 10, for example, in a winding roll, a guide roll, a nip roll, a hot rolling process of a steel plate, etc. used in a manufacturing process or a processing process of a long sheet-like material such as a resin film. Various industrial rolls such as a steel roll transport roll to be used are mentioned, and there is no particular limitation.

DESCRIPTION OF SYMBOLS 10 Rotating roll 11 Roll main body 12 Shaft part 13 Outer layer material 13a Hollow part 14 Core material

Claims (3)

In a rotating roll comprising a roll body and a shaft portion fitted into at least one end of the roll body and fixed to the roll body,
The shaft part includes an outer layer material and a core member which is disposed along the axial direction in the outer layer material and is made of a material having a higher tensile strength than the outer layer material.   2. The rotating roll according to claim 1, wherein the core member is disposed at at least one of a position on an axis of the shaft portion and a position symmetrical to each other with respect to the axis.   3. The rotating roll according to claim 1, wherein the shaft portion is obtained by inserting the core material into a hollow portion of the outer layer material formed by drilling.

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