JP3287709B2 - Presser roll for coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outermost peripheral surface of a coil which is provided in parallel with a take-up reel which takes up a strip as a coil and which comes into contact with the strip being wound on the take-up reel from the outside. Related to the presser roll pressed against

[0002]

2. Description of the Related Art For example, when a metal strip is manufactured by rolling, the rolled strip is wound by a rotating take-up reel to form a coil. In the case where the strip material is wound into a coil by the take-up reel, there is little constraint between the outermost peripheral surface of the coil of the strip material wound by the take-up reel and the strip material being wound by the coil. Lateral flow of the strip to be wound. That is, the take-up reel is likely to be displaced in the body length direction (the width direction of the strip), which is a problem in terms of the quality and productivity of the strip.

[0003] This is because an air film is generated in a gap between the strip and the outermost peripheral surface of the coil due to the flow of air generated by the movement of the strip (coil rotation) accompanying the winding of the strip into the coil. The reason for this is that since the formed strip material significantly reduces the friction between the strip material and the outermost peripheral surface of the coil, the strip material being wound does not reliably contact the outermost peripheral surface of the coil.

As a countermeasure for this phenomenon, as shown in FIG. 4, a press roll 1 combined with a roll shaft 2 is arranged in parallel with a take-up reel 51 for winding a strip P as a coil C.
A method is used in which the presser roll 1 is brought into contact with the strip P being wound on the take-up reel 51 from outside, and the strip P is pressed against the outermost peripheral surface of the coil C. The take-up reel 51 is mounted on a roll shaft 52, supported by a bearing (not shown), and rotated in a take-up direction by a rotation drive device (not shown).

In this method, by pressing the strip P against the outermost peripheral surface of the coil C, the formation of an air film between the strip P and the outermost peripheral face of the coil C is prevented, and at the same time, the pressing roll and the strip Due to frictional resistance due to contact with
Are prevented from laterally flowing.

Conventionally, the presser roll 1 in this method is
Cylindrical body (the line parallel to the roll body length direction is only a straight line)
And the roll shaft 2 is combined. Both ends of the roll shaft 2 are rotatably supported by bearings (not shown).

[0007] Bearings for supporting both ends of the roll shaft 2 are provided so as to be movable toward and away from the take-up reel 51 along a direction perpendicular to the body length direction of the take-up reel 51. A pressing force (not shown) is applied to the bearing in a direction approaching the take-up reel 51 by pressing means (not shown).

For this reason, when a pressing force P is applied to the bearing by the pressing means, the pressing roll 1 is moved via the roll shaft 2.
, A pressing force P acts on the pressing member 1, and the pressing roller 1 is displaced in a direction approaching the take-up reel 51 and comes into contact with the member P being wound on the take-up reel 5 from outside. Press against the outermost peripheral surface of coil C.

[0009]

However, the conventional press roll has the following problems. That is, presser roll 1
When a pressing force P is applied to both ends of the roll shaft 2 in order to use the
1 is higher than the contact pressure of the other parts, and the strip material P being wound on the take-up reel 51.
Phenomena that it is no longer possible to satisfactorily hold down.

In order to alleviate this tendency, as shown in FIGS. 4 and 5, a chamfer portion 1a (which slightly drops both shoulders of the roll) is added to both ends of the presser roll 1 in the body length direction. Have been done.

However, this countermeasure is also insufficient to alleviate the above tendency, and if the pressing force applied to both ends of the roll shaft 2 is increased, the pressing roll 1
Inconveniences such as scratching of the strip material P wound up in the roll 1 or a broken pattern (the shoulder marks at both ends of the roll are transferred to the strip material) occur. Therefore, there is a limit in increasing the pressing force.

Further, if the pressing force is reduced to such an extent that the strip P is not damaged, the pressing effect on the strip P may be insufficient and the horizontal flow of the strip P may not be suppressed. Further, since the contact pressure in the presser roll 1 is concentrated at both ends in the roll body length direction, the air interposed between the coil C and the strip P hardly escapes from both ends in the plate width direction of the coil to the outside. As a result, there is also a problem that the effect of preventing the formation of an air film between the coil C and the strip P being wound on the coil C is reduced.

The present invention has been made in view of the above circumstances, and a strip material being wound on a take-up reel is surely pressed by a coil of a strip material wound on the take-up reel without being damaged. It is an object of the present invention to provide a coil presser roll that can be used.

[0014]

In order to achieve the above object, a coil press roll of the present invention is provided in parallel with a take-up reel for winding a strip material as a coil, and is wound on the take-up reel. A crown is provided in a pressing roll that contacts the strip material being pressed from the outside and presses the outermost peripheral surface of the coil, and the amount of the crown is
Roll shaft deflection and Hertz contact according to pressing force
Considering the amount of deformation , the point that the contact pressure distribution in the roll body length direction with respect to the coil is uniform throughout the roll body length direction, and that the contact pressure in the center part in the roll body length direction is the roll body length The contact pressure is greater than the contact pressure at both ends in the direction of the roll body and between the point at which both ends in the roll body length direction maintain contact with the strip.

[0015]

The inventor of the present invention has conducted various studies on the phenomenon that contact pressure is concentrated on both ends in the body length direction of a conventional press roll by applying a pressing force to the roll shaft. As a result, the phenomenon that the contact pressure is concentrated on both ends of the press roll in the body length direction is caused by the fact that the roll shaft bends due to the pressing force applied to the both ends of the roll shaft in the body length direction. all right.

Therefore, in the present invention, the crown is formed on the press roll, and the concentration of the contact pressure generated at both ends in the body length direction of the press roll caused by the deflection of the roll shaft is adjusted according to the amount of deflection generated on the roll shaft. We have avoided it.

That is, the presser roll of the present invention has a crown shape in which the central portion in the roll body length direction expands.
The amount of the crown is set so that the contact pressure of the press roll against the coil is uniform over the entire length of the roll body and that both ends of the press roll in the body length direction do not separate from the outermost peripheral surface of the coil. It is in a range where the contact pressure at the center of the presser roll in the body length direction is larger than the contact pressure at both ends of the presser roll.

For this reason, by applying a pressing force to both ends of the roll shaft, it is possible to prevent the contact pressure at both ends in the body length direction of the presser roll from being extremely concentrated even when the roll shaft is bent. A sufficient pressing force is applied to the roll shaft supporting the presser roll without causing any damage or breakage to the strip being wound on the coil, and the presser roll can satisfactorily press the strip being wound on the coil. be able to.

Further, since pressure is not concentrated on both ends of the pressing roll, air generated between the coil and the strip being wound on the coil also flows from both ends in the width direction of the coil. It is easy to escape to the outside, and the effect of preventing the strip from meandering can be improved.

[0020]

Embodiments of the present invention will be described with reference to the drawings. 1 and 2 show one embodiment of a press roll of the present invention. In FIG. 1, reference numeral 11 denotes a press roll formed of metal. The press roll 11 is combined with a roll shaft 12, and is provided in parallel with a take-up reel 51 that takes up the strip P as a coil. The take-up reel 51 is attached to a roll shaft 52, and the roll shaft 5
2 is supported by a bearing (not shown) and rotated in a winding direction (the direction of the arrow shown in the figure) by a rotary drive device (not shown).

Both ends of the roll shaft 12 are rotatably supported by bearings (not shown). Bearings for supporting both ends of the roll shaft 12 are provided so as to be movable toward and away from the take-up reel 51 along a direction perpendicular to the body length direction of the take-up reel 51. , A pressing force is applied in a direction approaching the take-up reel 51 by pressing means (not shown).

Therefore, when a pressing force P is applied to the bearing by the pressing means, the pressing roll 1 is
1, the pressing roll P is displaced in the direction of approaching the take-up reel 51 and comes into contact with the strip P being wound on the take-up reel 51 from outside. To the outermost peripheral surface of the coil C.

The pressing roll 11 has a crown portion 11a, and further has chamfers 11b at both ends in the roll body length direction. Each crown 11b of the press roll 11 is formed to avoid concentration of contact pressure at both ends.

Here, the concept of the press roll 11 of the present invention will be described. The inventor of the present invention has found that the phenomenon in which the contact pressure is concentrated on both ends of the press roll is caused by the roll shaft flexing as a pressing force is applied to both ends of the roll shaft. Therefore, in the present invention, a crown is formed on the press roll to avoid concentration of contact pressure generated at both ends of the press roll caused by bending of the roll shaft. That is, as shown in FIG. 4, a conventionally used press roll 1 is cylindrical, and the press roll 1 is attached to the center of a roll shaft 2 having a smaller diameter. The presser roll 1 is in contact with the coil C at the outermost periphery. When a pressing force P is applied to both ends of the roll shaft 2 toward the coil C in this state, the roll shaft 2 bends as shown by a broken line in FIG. For this reason, the contact pressure with respect to the take-up reel 51 at both ends of the presser roll 1 becomes larger than the other portions due to the deflection of the roll shaft 2.

Therefore, in order to alleviate this tendency, as shown in FIGS. 4 and 5, both ends of the press roll 1 are provided with chamfer portions 1a (both shoulders of the roll are slightly dropped). .

However, in this case, if the pressing force applied to both ends of the roll shaft 2 is increased, the amount of deflection of the roll shaft 2 is increased, and the contact pressure distribution on the press roll 1 is reduced as shown in FIG. Compared to the normal state shown in FIG. 5A, the portions at both ends of the roll are increased as shown in FIG. 5B. As a result, the strip P wound by the presser roll 1 on the take-up reel 5 may be scratched or may have a broken pattern (the shoulder marks at both ends of the roll are transferred to the strip). Failure occurs.

Therefore, there is a limit in increasing the pressing force applied to the roll shaft 2. If the pressing force is reduced to such an extent that the strip P is not damaged, the pressing effect is insufficient and the lateral flow of the strip P cannot be suppressed.

Therefore, in the present invention, based on the recognition that the phenomenon that the contact pressure is concentrated on both ends of the press roll is caused by the deflection of the roll shaft caused by applying a pressing force to both ends of the roll shaft, The shape of the crown formed on the press roll 11 is determined. That is, the amount of deflection of the roll shaft 12 is obtained mechanically, and then the shape of the crown formed on the presser roll 11 is obtained by calculation using the Hertz contact formula.

First, as shown in FIG. 3, one part of the roll shaft 12 extending from the press roll 11, a part B of the press roll 11, and the other part of the roll shaft 12 extending from the press roll 11 In (c), a model in which an evenly distributed load g is applied to a part b of the presser roll 11 is considered. L1 in the figure,
L2 and L3 are the lengths of parts A, B and C, and L is the roll axis 1
2, the total length R is the reaction force of the pressing force applied to both ends of the roll shaft 12.

An arbitrary distance x is taken from the left end of the press roll 11 in the figure, and a moment M is obtained for each of the parts A, B and C. * Part A 0 ≦ x ≦ L1 M = (gL / 2) × x * Part B L1 ≦ x ≦ L1 + L2 M = (gL / 2) × x− (g / 2) × (x−L1) ² * C part L1 + L2 ≤ x ≤ LM = (gL / 2) x x-(gL2) x ｛x-(L1 + L
2/2)｝ Here, if the deflection of the roll axis and the presser roll is ω, the Young's modulus is E, and the second moment of area is I, d ² ω / dx ² = −M / MI (1)

For this reason, the moment M is substituted into the equation (1) for each of the ranges a, b, and c of each part, integrated, and the deflection of the roll shaft 12 is obtained by adding the boundary condition.
Next, the equation of Hertz contact will be described. Pressing force P,
Assuming that the contact length between the presser roll 11 and the coil C in the body length direction is S, the load p per unit length at the body length contact portion between the presser roll 11 and the coil C is p = P / L.
Here, the diameter of the presser roll 11 is D1, and the Young's modulus is E.
1, the Poisson's ratio is v1, the diameter of the coil C around which the strip P is wound is D2, the Young's modulus is E2, and the Poisson's ratio is v2. The length S of the body length direction contact portion between the presser roll 11 and the coil C is determined by the following equation.

[0032]

(Equation 1)

By using this calculation, it is possible to determine the optimum press roll crown according to the crown of the coil and the pressing force of the press roll. The crown shape is obtained by the calculation in this manner, and the presser roll 11 is obtained.
To form a crown portion 11a having a shape determined by the above calculation.
Then, according to the calculated crown shape, both ends of the presser roll 11 are dropped to form the chamfer portion 11b, and the presser roll 11 is formed into a crown shape whose central portion is swollen.

Here, when the pressing force is applied to the roll shaft 12 to press the pressing roll 11 against the coil C, and when the pressing force P applied to both ends of the roll shaft 12 is small, the pressing roll 11 If the part is separated from the coil C, the contact area between the press roll 11 and the coil C is reduced, and the pressing effect of the press roll 11 on the coil C is reduced. Also, when a high pressing force is applied to both ends of the roll shaft 12, the pressure at both ends of the press roll 11 becomes extremely large, which is not preferable.

Therefore, the amount of the crown portion 11a formed on the press roll 11 is set according to the distribution of the contact pressure of the press roll 11 with respect to the coil C based on the above-described consideration. That is, as shown in the diagram of FIG. 2, the amount of crown formed on the presser roll 11 is such that the contact pressure distribution of the presser roll 11 to the coil C in the roll body length direction is uniform throughout the roll body length direction. Points and
The pressure at the central portion in the roll body length direction is larger than the both ends in the roll body length direction, and both ends in the roll body length direction are the coils C.
Is determined within a range between the point F and the state where the contact state is maintained.

The point where the contact pressure at the center of the presser roll 11 is larger than the contact pressure at the end thereof and both ends of the presser roll 11 do not separate from the coil C is obtained by a combination of experiments and calculations.

Crown 11 formed on presser roll 11
When determining the amount of a in the above range, the amount of crown
When the contact pressure at the center of the presser roll 11 is determined to be larger than the contact pressure at both ends of the presser roll 11, the air between the coil C and the strip P being wound by the coil C is increased. The material P can easily escape to the outside from both ends in the plate width direction, and the effect of preventing the strip P from meandering itself increases.

Therefore, it is best for the crown portion 11a formed on the press roll 11 to have a contact pressure at the center of the press roll 11 in the body length direction larger than the contact pressure at both ends.

Presser roll 11 constructed as described above
Has a crown shape in which the central portion in the roll body length direction expands, and the contact pressure of the pressing roll 11 against the coil C is uniform over the entire body length direction in the roll body length direction. The contact pressure at the center of the presser roll 11 is larger than the contact pressure at both ends of the presser roll 11 within a range where the portion does not separate from the outermost peripheral surface of the coil C.

Therefore, by applying a pressing force to both ends of the roll shaft 12, even if the roll shaft 12 is bent,
Extremely concentrated contact pressures at both ends of the presser roll 11 in the body length direction can be avoided. As a result, the roll shaft 12 supporting the presser roll 11 can be formed without damaging or breaking the strip material P being wound around the coil C.
, A sufficient pressing force is applied, and the strip material P being wound on the coil C by the pressing roll 11 can be satisfactorily pressed.

Since pressure is not concentrated on both ends of the press roll 11, air generated between the coil C and the strip P being wound on the coil C is also discharged from both ends of the coil C to the outside. It is easy to escape, and the effect of preventing the strip P from meandering can be improved.

The present invention is not limited to the above-described embodiment, but can be implemented with various modifications. For example, the present invention is not limited to a coil holding roll provided in combination with a winding coil for winding a metal strip, but a coil holding roll provided in combination with a winding coil for winding strip products such as paper and film. Also applicable to

[0043]

As described above, according to the coil presser roll of the present invention, the central portion in the roll body length direction has a crown shape that expands, and the contact pressure of the presser roll with respect to the coil is reduced in the roll body length direction. The contact pressure at the center of the presser roll in the body length direction is within a uniform point over the entire length of the presser roll, and both ends of the presser roll in the machine length direction do not separate from the outermost peripheral surface of the coil. In the range with a point greater than the contact pressure of the part.

For this reason, by applying a pressing force to both ends of the roll shaft, it is possible to prevent the contact pressure at both ends in the body length direction of the press roll from being extremely concentrated even if the roll shaft is bent. A sufficient pressing force is applied to the roll shaft to which the presser roll is attached without causing any damage or breakage to the strip that is being wound around the coil, and the presser roll can press the strip that is being wound around the coil satisfactorily. It is possible.

Further, since pressure is not concentrated on both ends of the press roll, air generated between the coil and the strip being wound on the coil is discharged from both ends of the strip wound as the coil. It is easy to escape to the outside, and the effect of preventing the strip from meandering can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of a press roll of the present invention.

FIG. 2 is a view showing a contact pressure distribution of a press roll of the embodiment.

FIG. 3 is a view for explaining calculation for obtaining deflection in a presser roll of the embodiment.

FIG. 4 is a diagram showing an example of a conventional press roll.

FIG. 5 is a diagram showing deflection in a press roll of the conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... press roll, 2 ... roll shaft, 11 ... press roll, 12 ... roll shaft, 11a ... crown part, 11b ... champ part, 51 ... take-up reel.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21C 47/06 B65H 19/22

Claims (1)

(57) [Claims] 1. A strip material, which is provided in parallel with a take-up reel that winds the strip material as a coil, contacts the strip material being wound on the take-up reel from the outside, and presses the strip material on the outermost peripheral surface of the coil. In the presser roll, a crown is provided, and the amount of the crown is determined by the pressing force.
Roll shaft deflection and hertz contact deformation
The point that the contact pressure distribution in the roll body length direction with respect to the coil is uniform throughout the roll body length direction, and that the contact pressure in the center part of the roll body length direction is equal to the both ends in the roll body length direction. A pressurizing roll for the coil, wherein the pressing pressure is determined within a range larger than a contact pressure of the roll portion and a point at which both ends in the roll body length direction maintain a state of contact with the strip.