JPH07102383B2 - Roller in the looper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a roll in a looper used in a looper for moving and moving a carriage to store and pay out a metal band, and in particular, has a tapered portion at both ends and a tapered crown. It relates to a roll in the looper that does not meander or squeeze in the metal strip because the amount is appropriate.

[Prior Art] A roll in a looper used for a looper for moving and moving a carriage to store and pay out a metal band, as shown in FIG. 2, in order to prevent the metal band from meandering.
Tapered portions 22 are provided at both ends of 21. This is because when both ends of the metal strip 23 are brought into contact with the roll taper portion 22 by their own weight, a state where the metal strip 23 always faces the roll center portion is formed due to the difference in peripheral speed between the roll central portion 24 and the roll taper portion 22. Because it is done.

[Problems to be Solved by the Invention] However, if the taper crown amount of the roll in the looper is set too large, both ends of the metal strip do not come into contact with the taper portion of the roll, and it is the metal strip that is in contact with the roll. Since it is only in the central part, it is the same as using the flat roll 25 as shown in FIG. 3, so there is a problem that the meandering is likely to occur.

Moreover, if the tension of the metal strip is increased so that the meandering does not occur, wrinkles are likely to occur in the portion of the metal strip that is in contact with the boundary between the flat portion and the taper portion of the roll (26 in Fig. 2). There was a problem.

The present invention solves the above-mentioned problems of the prior art,
It is an object of the present invention to provide an in-looper roll having an appropriate taper crown amount.

[Means for Solving the Problems] A roll in the looper according to the present invention is a looper having a roll body length larger than a metal strip width, a parallel portion smaller than a metal strip width, and taper portions at both ends of the body portion. In the roll, the taper crown amount ΔH is in the range of 0.3 to 1.4 mm and satisfies the following expression, which is a roll in a looper.

ΔH <{(U ・ T) L / πE} ・ {(AB) / (WB)} where U ・ T: Unit tension (kgf / mm ² ), L: Roll span (mm), E: Young's modulus ( kgf / mm ² ), π: Circumferential ratio, A: Roll body length (mm), B: Roll parallel part body length (mm), W: Metal band width (mm).

[Operation] A looper inner roll according to the present invention is a looper inner roll having a roll cylinder length larger than a metal strip width, a parallel portion smaller than a metal strip width, and taper portions at both ends of the body portion, and a taper crown amount. ΔH is in the range of 0.3 to 1.4 mm and satisfies the following equation.

ΔH <{(U ・ T) L / πE} ・ {(AB) / (WB)} where U ・ T: Unit tension (kgf / mm ² ), L: Roll span (mm), E: Young's modulus ( kgf / mm ² ), π: Circumferential ratio, A: Roll body length (mm), B: Roll parallel part body length (mm), W: Metal band width (mm).

The reason is as follows. That is, FIG. 4 (a)
Like diameter Dmm, roll body length Amm, roll parallel part body length Bm
Roller 21 in looper having taper parts 22 at both ends of m
Consider a state in which both ends of the metal strip 23 are in complete contact with the taper portion 22 of the roll 21 while the metal strip 23 having the width W (where B <W <A) is wrapped around. The taper roll diameter at the position of the edge portion 23a of the metal band is dm
m, the crown amount at that position is Δhmm, and the crown amount at the end of the roll is ΔHmm, Δh = ΔH · (WB) / (AB) (1) d = D-2Δh (2 ) Assuming that the metal strip 23 is wound around half of the roll 21, the contact length of the metal strip 23 with the roll 21 is l _C = πD / 2 at the central portion of the metal strip as shown in FIG. 5 (a). (3) At the edge 23a of the metal strip, as shown in FIG. 5 (b), l _E = πd / 2 (4) When the roll span of the roll 21 in the looper is Lmm, at the edge 23a of the metal strip, Since the portion of Lmm length shown in FIG. 4 (b) is contracted by the length of (l _C −l _E ), the strain Δε can be expressed by the following equation.

Δε = (l _C −l _E ) / L (5) Substituting the equations (2), (3) and (4), Δε = (πD / 2−πd / 2) / L = π ( D−d) / 2L = π {D− (D−2Δh)} / 2L = πΔh / L (6) Therefore, the stress Δσ (kgf / mm ² ) is Young's modulus E (k
gf / mm ² ) becomes the following formula.

Δσ = EΔε = πEΔh / L (7) Substituting the equation (1), Δσ = πE {ΔH · (W−B) / (A−B)} / L.
(8) If the unit tension acting on the metal strip is U · T (kgf / mm ² ), Δσ <U · T (9) From equations (8) and (9), ΔH <{(U · T) L / πE} · {(AB) / (WB)} (10) That is, in order to bring the metal strip into contact with the taper of the roll to the extent that no meandering occurs, the taper crown amount ΔH of the roll is (10) It suffices to use a roll satisfying the formula, and this roll can prevent the metal strip from meandering.

Next, regarding the relationship between the taper crown amount ΔH (mm) of the roll and the maximum meandering amount (mm), when a roll with a roll body length of 1500 mm and a roll parallel portion body length of 480 mm is wrapped with a 900 mm wide metal band, investigated. In that case the line speed is 20
0m / min., Roll span is 5,000mm and 10,000mm 2
The level was investigated. As a result, as shown in FIG.
In both cases, when ΔH becomes small, meandering occurs,
When H becomes large, there is a tendency that the diaphragm is generated, and ΔH is 0 as a range in which the meandering does not occur and the diaphragm does not occur.
Since it was found that the range of 3 to 1.4 mm was optimal, ΔH
Tried to keep it within that range.

[Example] In order to understand how the meandering was improved by the present invention as compared with the conventional example, the relationship between the line speed and the amount of meandering was investigated by changing the line speed variously. The results are shown in FIG. 1 in comparison with the case of using the conventional roll. When FIG. 1 (a) uses the roll of the present invention, FIG. 1 (b)
Is when a conventional roll is used.

As is apparent from FIG. 1, the meandering of the steel strip could be improved by using the roll in the looper of the present invention.

[Advantages of the Invention] According to the present invention, meandering of a metal band can be improved.

[Brief description of drawings]

FIG. 1 is a graph showing the relationship between the line speed and the amount of meandering, FIG. 2 is a perspective view showing a state in which a metal band is wound around a roll in a looper having a taper, and FIG. 3 is a perspective view of a flat roll. FIG. 4 is an explanatory diagram for explaining the relationship between the amount of taper crown and other roll specifications when the metal strip is wound around the roll in the looper having a taper, and FIG. 5 is an explanatory diagram showing the contracted state of the metal strip. , FIG. 6 is a graph showing the relationship between the amount of taper crown and the amount of meandering.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-56-87633 (JP, A) JP-A-56-152932 (JP, A) JP-A-63-162819 (JP, A) Actual development Sho-62- 153420 (JP, U)

Claims (1)

[Claims] 1. In a looper roll having a roll body length larger than a metal band width, a parallel portion smaller than a metal band width and having taper portions at both ends of the body portion, a taper crown amount ΔH is 0.3 to 1.4 mm. A roll in a looper that is in a range and satisfies the following formula. ΔH <{(U ・ T) L / πE} ・ {(AB) / (WB)} where U ・ T: Unit tension (kgf / mm ² ), L: Roll span (mm), E: Young's modulus ( kgf / mm ² ), π: Circumferential ratio, A: Roll body length (mm), B: Roll parallel part body length (mm), W: Metal band width (mm).