JP2017051993A - Maximum allowable load calculation method of embossed steel plate drawing down in tension roller and condition setting method of tension roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make standardization of a setting means for setting such conditions that embossment is not crushed possible in a tension roller for winding an embossed steel plate to a recoiler while giving tension to the embossed steel plate.SOLUTION: A method for calculating the maximum allowable load N(kg) of drawing down is capable of applying back tension without crushing embossment of an embossed steel plate when the embossed steel plate is subjected to drawing down with a tension roller of which an outer circumferential surface is made of a rubbery elastomer while giving tension between a recoiler and the tension roller. Therein, the maximum allowable load q(kg/mm) per embossment circumference unit length capable of pressurization without crushing embossment is experimentally determined, the whole circumferential length L(mm) of embossment existing on a tension roller nip width region of an objective embossed steel plate is calculated or measured and the maximum allowable load N(kg)is calculated by Eq. (3): N=q×L...(3).SELECTED DRAWING: Figure 6

Description

  In this invention, when the embossed steel sheet is rolled down with a tension roll and tensioned between the recoiler and wound around the recoiler, the maximum permissible load Nkg that can be rolled up without crushing the embossed steel sheet is reduced. The present invention relates to a calculation method and a tension roll condition setting method for preventing the emboss from being crushed by the tension roll.

In the embossed steel sheet manufacturing apparatus, as shown in FIG. 1, after embossing is formed on the steel sheet by the embossing apparatus 1, the embossed steel sheet 2 is loop-controlled by the looper 3 and wound by the recoiler 5 through the tension roll 4.
In order to wind the embossed steel plate 2 with the recoiler 5 without loosening, it is necessary to apply a tension (back tension) to the recoiler 5 by reducing the embossed steel plate with the tension roll 4 to generate a braking force. As shown in FIG. 2, the tension roll 4 squeezes the embossed steel plate (work) 2 with the upper and lower rolls 4 a, 4 b and applies a braking force by a resistance torque to the embossed steel plate 2.
If the material to be wound is a flat steel plate, the rolling force by the tension roll can be simply applied by a recoiler so that it can be wound without loosening. In the case of an embossed steel plate, the embossed steel plate will not be crushed. It must be reduced with such a reduction force.
There are various embossed shapes of embossed steel sheets, and it is difficult to calculate what kind of load the rolling force does not crush the embossing in each case, so conventionally it is not a standardized clear method but empirical The work was adjusted on site to reduce the embossing to such an extent that it would not collapse.

  Patent Document 1 describes that a tension is applied to an embossed metal thin plate with an adjusting device. Patent Document 1 will be described with reference to the reference numeral described therein. After embossing is performed on the metal thin plate M by the embossing device 2, the embossed metal thin plate M is given tension by the adjusting device 5. Patent Document 1 relates to a metal tube manufacturing apparatus in which the embossed metal thin plate M is formed into a tubular shape by a tube forming device 3, and the adjusting device 5 is also a peculiar configuration, which is different from the case of the present invention. is there.

JP2000-42626

As described above, it is difficult to calculate the conditions that do not crush the emboss in the tension roll for various emboss shapes, but again, standardizing the conditions that do not crush the emboss increases the productivity, Desirable to ensure quality.
The inventors of the present application are performing an emboss formation experiment for forming an emboss on a steel plate and an emboss crush experiment for crushing an emboss of an embossed steel plate under the problem of standardizing conditions that do not crush the emboss. The knowledge that the load per unit length q (kg / mm) of the emboss circumference so that the emboss is not crushed is obtained regardless of the emboss pattern, and the present invention was obtained based on this knowledge. is there.

  As described above, an object of the present invention is to make it possible to standardize setting means for setting conditions that do not crush embossing in a tension roll for winding around a recoiler while tension is applied to an embossed steel sheet.

The invention according to claim 1 which solves the above-mentioned problem is that when the embossed steel sheet is rolled down by a tension roll whose outer peripheral surface is made of a rubber-like elastic body and tension is applied between the embossed steel sheet and wound on the recoiler. A method of calculating a maximum allowable load N (kg) under reduction capable of applying a back tension without crushing,
The maximum permissible load q (kg / mm) per unit length of embossing that can be pressed without crushing the emboss is experimentally determined, and all the embosses existing in the tension roll nip width region of the target embossed steel sheet The circumferential length L (mm) is calculated or measured, and the maximum allowable load N (kg) is calculated by equation (3).
N = q × L (3)

The invention of claim 2 is the method of calculating the maximum allowable load in the tension roll of claim 1,
When the thickness of the embossed steel sheet is 0.27 mm to 0.6 mm, the q (kg / mm) is 3.02 kg / mm ± 10%.

但し、Ｐ≦ｑ×Ｌ（又は、１≦ｑ×Ｌ／Ｐ） ・・・（１２） In the invention of claim 3, when the embossed steel sheet is rolled down with a tension roll whose outer peripheral surface is made of a rubber-like elastic body and tensioned between the embossed steel sheet and wound around the recoiler, the embossed steel sheet is wound without crushing. A tension roll condition setting method for setting a condition that can be taken using the maximum allowable load “q × L” calculated by the maximum allowable load calculation method under embossed steel sheet reduction according to claim 1 or 2,
When the rolling force of the tension roll is P, the radius of the tension roll is R, the friction coefficient of the outer peripheral surface of the tension roll is μ, and the nip width of the tension roll is Dmm, the following expressions (11) and (12) are satisfied. A tension roll condition setting method, wherein the R, μ, D, P, and L are determined under conditions.

However, P ≦ q × L (or 1 ≦ q × L / P) (12)

但し、Ｐ≦ｑ×Ｌ（又は、１≦ｑ×Ｌ／Ｐ） ・・・（１２） According to a fourth aspect of the present invention, in the tension roll condition setting method of the third aspect, when the R, μ, and L are determined, the nip width D satisfies the following expression (1 of 13): A reduction force P is set.

However, P ≦ q × L (or 1 ≦ q × L / P) (12)

Claim 5 is the tension roll condition setting method according to claim 3 or 4, wherein when the embossed steel plate has a thickness tmm and a plate width Wmm, the embossed steel plate can be wound around the recoiler without looseness. A back tension τkg / mm ² per unit cross-sectional area is obtained, and the rolling force P is set so as to satisfy Expression (17).
W × t × τ / μ ≦ P (17)

  According to the invention of claim 1, if the maximum allowable load q (kg / mm) per emboss circumferential unit length that can be pressurized without crushing the emboss is experimentally obtained in advance, the emboss pattern The maximum permissible load N (kg) for reduction without fear of crushing the emboss by simply obtaining the total circumference L (mm) of the emboss existing in the tension roll nip width region of the target embossed steel plate Therefore, it is possible to easily set an appropriate reduction force for the tension roll.

  According to the invention of claim 2, if a numerical value of 3.02 kg / mm ± 10% is used as the maximum permissible load q (kg / mm) per emboss circumferential unit length, the emboss is not likely to be crushed. A maximum allowable load N (kg) under reduction is obtained.

  According to the invention of claim 3, not only the rolling force P but also the proper conditions that do not cause the embossing to crush are set including the friction coefficient μ of the tension roll, the roll radius R, and the specifications of the nip width D. Therefore, the degree of freedom in designing the tension roll is increased, and it becomes easy to appropriately cope with various situations.

When actually adjusting the tension roll in the field, the roll radius R, the friction coefficient μ of the roll, and the total circumferential length L of the emboss are predetermined, so that the nip width D is as in claim 4 Therefore, the adjustment work is very simple and the workability is good because the adjustment is made so as not to exceed the right side (2 μR / √ (1 + μ ² )) of Expression (13-1).

FIG. 1 shows an example of an apparatus to which the present invention is applied, and is a diagram that simplifies and explains an apparatus from an emboss forming apparatus to a recoiler in an emboss forming facility. It is a figure which simplifies and demonstrates the situation at the time of giving a back tension to an embossed steel plate with a tension roll. It is a figure explaining the experimental point of an emboss crushing experiment, and is a principal part enlarged view showing the situation where embossed steel plates are arranged between the upper and lower molds of a press machine. In the embossing crushing experiment shown in FIG. 3, the location (A, B, C, D, where the embossed height change amount (crushing amount) was measured when the specimen (embossed steel plate) was squeezed with a plurality of loads. It is a figure explaining E). It is a figure explaining the nip width D which is the material feed direction length of the part which the tension roll is contacting the embossed steel plate. FIG. 5 is a diagram illustrating a geometrical state in a state where an embossed steel sheet is being rolled down by a tension roll, and is an analysis diagram illustrating torque calculated from rolling theory (torque calculated by tension). It is a figure which shows an example of the specific pattern of stucco-like embossing.

  Hereinafter, an embodiment for carrying out a method of calculating a maximum allowable load under embossed steel sheet reduction and a tension roll condition setting method in a tension roll according to the present invention will be described with reference to the drawings.

As described below, the present invention is obtained on the basis of knowledge obtained during an emboss formation experiment for forming an emboss on a steel plate and an emboss crush experiment for crushing the emboss of an embossed steel plate. .
First, steel plates with a size of 100 mm x 100 mm and thicknesses of 0.27 mm, 0.4 mm, and 0.6 mm, respectively, were pressed with upper and lower molds with unevenness that would form embosses instead of rolls. An experiment to form embossing (checker embossing) was conducted. In this emboss formation experiment, the emboss depth formed for each applied pressure was measured for various applied pressures, and the relationship between the applied pressure and the embossed depth ("pressed pressure-embossed depth") was investigated. It was.
For example, for a steel plate with a thickness of 0.27 mm, when the number of checker embosses of 4 mm in length and width is 145 pieces, the circumference is 16 mm per piece, and the total circumference is L2320 mm, the pressure is reduced with various pressures P. Embossing was not formed, and the increase in embossing depth became clear from about 15 tons, and the embossing depth suddenly increased in the range of about 20 to 30 tons.
Therefore, it can be said that embossing is not formed at a pressure of about 7 tons in a thickness range of at least 0.27 mm to 0.6 mm (a range thicker than 0.27 mm).
This is represented as follows by the load per unit length of the emboss circumference (= pressing force P / total emboss length L).
P / L = 7000kg / 2320mm = 3.02kg / mm (1)
That is, “3.02 kg / mm” is defined as the load q ′ per emboss circumferential unit length where no emboss is formed.

Next, a metal embossing experiment was conducted in which embossing was formed between the upper and lower embossing rolls through a steel plate.
For round embossing,
Embossed perimeter L = 125.6mm
Load P at displacement 3mm = 1150kg
Therefore,
P / L = 1150 / 125.6 = 9.16 kg
Met.
In the case of stucco embossing with the pattern shown in FIG.
Embossed perimeter L = 1642mm
Load P at displacement 3mm = 15000kg
Therefore,
P / L = 15000/1642 = 9.14kg
Met.
As described above, in the case of round embossing, P / L = 9.16 kg, and in the case of stucco embossing, P / L = 9.14 kg. Therefore, even if the embossing pattern is different, the ratio (P / L) of the pressure P (kg: referred to as “embossing load”) required for forming the embossing at a predetermined depth and the total embossing length L (P / L) is almost the same. It turns out that it is the same.
That is, it was found that the emboss formation load P is substantially the same (kg / mm) per unit length of the emboss circumference even if the emboss pattern is different.

Similarly, when the embossing of the embossed steel sheet is crushed, even if the embossing pattern is different, the pressing force required to crush the embossed steel sheet (kg: embossed crushing load) As a result of conducting the following emboss crushing experiment that crushes the embossing of the embossed steel sheet, as explained below, it is assumed that it is correlated with the length. It was found that the load q (kg / mm) was almost constant regardless of the embossed pattern.
In this emboss crushing experiment, as shown in the enlarged view of the main part in FIG. 3, the lower die 11-urethane rubber 112-embossed steel plate (test piece) 2'-urethane rubber 13-upper die 14 is gradually applied to reduce the embossing. It was an experiment to see the change in the steel sheet, and the load at which deformation (collapse of embossing) started was read.
<Test body>: Embossed steel plate (cut plate) cut into a size of 100 mm (length) x 100 mm (width) with a shear. Three plate thicknesses of 0.27mm, 0.4mm, and 0.6mm
<Urethane rubber (Shore hardness 90 °)>: 120 (length) x 120 (width) x 30 (thickness)
<Used press> Amino Kogyo hydraulic 100ton press (PDR100T)
<Measurement Location> The embossed height before and after pressing was measured at five points A to E of the embossed steel sheet in FIG. 4 (the amount of change (crushing amount) of the embossed height was examined).

As a result of the experiment, crushing was observed from 15 tons at a thickness of 0.27 mm, crushing was observed from 20 tons at a thickness of 0.4 mm, and crushing was observed from 25 tons at a thickness of 0.6 mm. In the thickness range of 0.27 mm to 0.6 mm, 15 tons in the case of 0.27 mm, the thinnest load, should be considered as the load that does not allow the emboss to be crushed. It can be set as 7 tons as the applied pressure.
This value corresponds to 7 tons of the experimental result (embossing molding experiment) performed by the mold performed earlier. Therefore, in the case of an embossed steel sheet having a thickness of 0.27 mm to 0.6 mm, the validity of setting the maximum allowable load q (kg / mm) per emboss circumferential unit length at which the emboss is not crushed to 3.02 kg / mm. Can be said to have been verified. That is, the load q ′ per emboss circumferential unit length where the emboss is not formed and the load q per unit length of the emboss circumference for preventing the emboss from being crushed can be assumed to be the same.
Therefore, if the maximum allowable load for preventing the emboss from being crushed is N, regardless of the emboss pattern,
N = 3.02 × L (2)
It is.
If this is applied to the general case, regardless of the embossed pattern,
N = q × L (3)
It is.

Based on the above-mentioned knowledge that the load q (kg / mm) per unit length of the embossed circumference to prevent the emboss from being crushed is almost constant regardless of the emboss pattern, the emboss crushed when the embossed steel sheet is rolled down with a tension roll The conditions involved in the study were considered as follows.
The following conditions are involved in emboss crushing.
-Rolling force: P (kg)
・ Back tension force (tension): F (kg)
・ Friction coefficient of tension roll surface: μ
-Total length of emboss: L (mm)
・ Maximum allowable load per unit length: q (kg / mm)
-Roll radius: R (mm)
・ Maximum allowable load (load where the emboss is not crushed): N (kg) (= q × L)
-Nip width: D (mm)
The nip width D is the length in the material feed direction of the portion where the tension roll is in contact with the embossed steel plate (see FIG. 5).
In the present invention, the tension roll is formed of a rubber-like elastic body having an outer peripheral portion with a friction coefficient μ.

FIG. 6 (a) is a diagram illustrating the geometrical state in a state where the embossed steel sheet is being rolled down by a tension roll, and the torque calculated from the rolling theory (torque calculated by tension) will be described. FIG.
In FIG. 6, δ is a roll radius decrease (mm) at the center position of the roll nip width D, as shown in an enlarged view in FIG.
Since the back tension force F is “rolling force P × friction coefficient μ”,
F = μ × P (4)
It is.
Moreover, the torque T is T = Pa × (D / 2) (5) from the rolling theory.
Where Pa is the rolling load,
It is.
Therefore,
D = 2 × T / Pa (6)
Here, when the maximum permissible load N = q × L at which the above-described emboss crushing does not occur is applied as the rolling load Pa in the equation (5),
D = 2 × T / q × L (7)
It is.

但し、Ｐ≦ｑ×Ｌ（又は、１≦ｑ×Ｌ／Ｐ） ・・・（１２）
また、式（１１）をニップ幅Ｄについて整理すると、その計算過程の説明は省略するが、上記関係式（式（１１）、（１２））は、

但し、Ｐ≦ｑ×Ｌ（又は、１≦ｑ×Ｌ／Ｐ） ・・・（１２）
となる。
すなわち、対象とするエンボス鋼板について、エンボス周単位長さ当たりの最大許容荷重ｑを求めておけば、上記の関係式（式（１１）、（１２））を満たす条件のもとで、ロール半径Ｒ、ロールの摩擦係数μ、圧下力Ｐ、ニップ幅Ｄ、エンボス鋼板のエンボス全周長Ｌのいずれも適宜の数値を選択することができ、エンボスが潰れずにバックテンションをかけることが可能なテンションロール設計の自由度が高くなり、種々の情況に適切に対応することが容易になる。 On the other hand, the torque T applied to the embossed steel sheet by the tension roll is the product of the back tension force F and r in FIG.
T = F × r
= (Μ × P) × r
= Μ × P × r (8)
Here, in ΔOAB,
R ² = (R−δ) ² + (D / 2) ²
If R−δ = r,
R ² = r ² + (D / 2) ²
r ² = R ² − (D / 2) ²
Ｒ r = √ (R ² − (D / 2) ² )
= (1/2) × √ (4R ² −D ² )
= 0.5√ (4R ² −D ² ) (9)
From equations (7), (8), and (9), the nip width D is
D = 2 × T / q × L
&shy; = 2 × (μ × P × r) / q × L
= {2 × (μ × P × 0.5√ (4R ² −D ² )} / q × L
&shy; = {μP√ (4R ² −D ² )} / q × L (10)
By transforming this equation,
&shy;&shy; q × L = {μP√ (4R ² −D ² )} / D
Swap left side and right side
{μP√ (4R ² −D ² )} / D = q × L
By transforming this equation,

However, P ≦ q × L (or 1 ≦ q × L / P) (12)
Further, when formula (11) is arranged with respect to the nip width D, explanation of the calculation process is omitted, but the above relational expressions (formulas (11) and (12)) are:

However, P ≦ q × L (or 1 ≦ q × L / P) (12)
It becomes.
That is, if the maximum permissible load q per embossed circumferential unit length is determined for the target embossed steel sheet, the roll radius is satisfied under the conditions satisfying the above relational expressions (Equations (11) and (12)). R, the friction coefficient μ of the roll, the rolling force P, the nip width D, and the entire embossed circumferential length L of the embossed steel plate can be selected from appropriate values, and the back tension can be applied without the emboss being crushed. The degree of freedom in designing the tension roll is increased, and it becomes easy to appropriately cope with various situations.

但し、Ｐ≦ｑ×Ｌ（又は、１≦ｑ×Ｌ／Ｐ）・・・（１２）
ニップ幅Ｄは圧下力Ｐが大となれば大となり圧下力Ｐ小となれば小となるから、テンションロール装置の現場作業においては、ニップ幅Ｄが前記最大許容荷重Ｎ（＝ｑ×Ｌ）に対応するニップ幅Ｄより大きくならないように観察しながら（すなわち、Ｐ≦ｑ×Ｌの条件のもとで、）圧下を加えるという簡単な作業で、エンボス潰れの生じない圧下設定が実現される。
なお、後述する通り、エンボス鋼板がリコイラーに緩みなく巻き取られるために必要な最低圧下力Ｐmin以上の圧下力Ｐを加える（以下の各場合も同じ）。
（イ−２）種々のエンボス全周長Ｌがある場合には、エンボス全周長Ｌとして最大エンボス全周長Ｌmaxを採用して、前記の付帯条件の式（１２）は、
但し、Ｐ≦ｑ×Ｌmax ・・・（１２の１）
となる。
したがって、Ｐ≦ｑ×Ｌmax の条件のもとで、ニップ幅Ｄが前記最大許容荷重Ｎ（＝ｑ×Ｌmax）対応するニップ幅Ｄより大きくならないように観察しながら圧下を加えるとよい。 The relational expressions (formulas (11) and (12)) or (formulas (13) and (12)) can be used in various situations as described below.
[1] When the tension roll device has sufficiently high rigidity (roll shaft rigidity, stand frame rigidity, etc.) and does not become an element that limits the rolling force P.
(A) For example, when the tension roll is an existing one (that is, the tension roll radius R and the roll friction coefficient μ are constant (specific values)).
(A-1) In this case, the above relational expressions (formulas (13) and (12)) are the relational expressions of the embossed total circumferential length L, the rolling force P, and the nip width D, but the rolling force P is The nip width D when the maximum allowable load N (= q × L) is obtained.
The nip width D corresponding to the maximum allowable load N (= q × L) is
q × L / P = 1

However, P ≦ q × L (or 1 ≦ q × L / P) (12)
Since the nip width D is large when the rolling force P is large and small when the rolling force P is small, the nip width D is the maximum allowable load N (= q × L) in the field work of the tension roll device. A reduction setting that does not cause emboss crushing can be realized with a simple operation of applying a reduction while observing the nip width D corresponding to the above (ie, under the condition of P ≦ q × L). .
In addition, as will be described later, a rolling force P equal to or higher than the minimum rolling force Pmin necessary for the embossed steel sheet to be wound around the recoiler without looseness is applied (the same applies in the following cases).
(B-2) When there are various embossed total perimeters L, the maximum embossed total perimeter Lmax is adopted as the embossed total perimeter L, and the above-mentioned incidental formula (12) is
However, P ≦ q × Lmax (1 of 12)
It becomes.
Therefore, under the condition of P ≦ q × Lmax, it is preferable to apply the reduction while observing so that the nip width D does not become larger than the nip width D corresponding to the maximum allowable load N (= q × Lmax).

(B) When the tension roll radius R and the roll friction coefficient μ are undetermined (that is, when a tension roll is newly designed).
In this case, in the above equation (13), in addition to R and μ, the embossed total circumferential length L and the rolling force P are also variables. Pmax (= q × Lmax) is determined by P = q × Lmax (constant). Incidentally, the nip width D is may be selected empirically reasonable value D _0.
Therefore, the above expressions (13) and (12) become the following expressions (13 ′) and (12 ′).
D ₀ = 2 μR / √ ((q × Lmax / Pmax) ² + μ ² ) (13 ′)
However, Pmax ≦ q × Lmax, or 1 ≦ q × Lmax / Pmax (12 ′),
In this case, when one of the roll radius R and the friction coefficient μ is determined, the other is determined.

[2] When the rolling force P is limited by the rigidity of the tension roll device (roll shaft rigidity, stand frame rigidity, etc.).
Assuming that the upper limit reduction force P limited by the rigidity of the tension roll device is the upper limit reduction force Psmax, in the equations described in [1] and [2] above,
Rolling force P (or Pmax) ≦ Psmax (14)
The condition is further added.
That is, in each case of [1] and [2]
“Q × L” in equation (12) of (A-1),
“Q × Lmax” in equation (1-12) of (a-2),
“Pmax” in equation (13 ′) of (b),
Are larger than Psmax, Psmax is adopted instead of the values of “q × L”, “q × Lmax”, and “Pmax”.

The minimum rolling force Pmin necessary for the embossed steel sheet to be wound around the recoiler without loosening will be described.
When the back tension “F” in the above-described formula (4) “F = μP” is the minimum back tension necessary to prevent looseness when the embossed steel sheet is wound around the coil,
F / μ ≦ P (15)
It is.
Therefore, in consideration of the conditions for preventing the above-mentioned embossing from being crushed and the conditions for winding the embossed steel sheet without loosening, the above expressions (12), (12-1), and (14) are The following (12 ′), (1 ′ of 12), (14 ′),
F / μ ≦ P ≦ q × L (12 ′)
F / μ ≦ P ≦ q × Lmax (1 ′ of 12)
F / μ ≦ P ≦ Psmax (14 ′)
It becomes.
Note that in the case of an embossed steel sheet having a thickness of 0.27 mm to 0.6 mm, q = 3.02 kg / mm, so the above expression (12 ′) is expressed by the following expression (12 ″)
F / μ ≦ P ≦ 3.02L (12 ″)
It becomes.

A specific minimum back tension will be described.
When the back tension per unit cross-sectional area of the steel sheet, that is, the unit tension is τ (g / mm ² ), the coil width is W (mm), and the plate thickness is t (mm), the back tension F is expressed by the following equation (16). It becomes.
F = W × t × τ (16)
Therefore, the above (15) becomes the following equation (17).
W × t × τ / μ ≦ P (17)

When calculating minimum back tension for no looseness in winding the steel sheet into a coil, the unit tension τ a (kg / mm ²⁾ and 1.2~3.0kg / mm ² to be suitable It has been known.
Assuming that the unit tension τ = 2 kg / mm ² , F = 540 kg from the above equation (16) when the coil width W = 450 mm and the plate thickness 0.6 mm.
When the frictional force μ = 0.15, the minimum rolling force P for preventing the coil winding from loosening is obtained from the equation (17):
Rolling force P = 540 / 0.15 = 3600kg
It becomes. Therefore, this value is the minimum value of the rolling force P applied as a tension roll.

2 Embossed steel plate 2 'Specimen (embossed steel plate)
4 (4a, 4b) Tension roll 5 Recoiler P, Pmax, Psmax Rolling force (kg)
F Back tension force (tension) (kg)
μ Friction coefficient (of tension roll)
R Tension roll radius (mm)
D Nip width (mm)
L Embossed perimeter (existing in the nip width region of tension roll) (mm)
Lmax Expected maximum embossed perimeter L (mm)
N (Emboss is not crushed) Maximum allowable load (kg)
q Maximum permissible load per unit length of embossed circumference (kg / mm)

Claims (5)

When the embossed steel sheet is rolled down with a tension roll whose outer peripheral surface is made of a rubber-like elastic body and tensioned between the recoiler and wound on the recoiler, back tension can be applied without crushing the embossed steel sheet. A method for calculating a maximum allowable load N (kg) under reduction,
The maximum permissible load q (kg / mm) per unit length of embossing that can be pressed without crushing the emboss is experimentally determined, and all the embosses existing in the tension roll nip width region of the target embossed steel sheet A method for calculating a maximum allowable load under an embossed steel sheet in a tension roll, wherein the circumferential length L (mm) is calculated or measured, and the maximum allowable load N (kg) is calculated according to Equation (3).
N = q × L (3)   2. The embossed steel sheet in a tension roll according to claim 1, wherein q (kg / mm) is 3.02 kg / mm ± 10% when the thickness of the embossed steel sheet is 0.27 mm to 0.6 mm. The maximum allowable load calculation method. When the embossed steel sheet is rolled down with a tension roll whose outer peripheral surface is made of a rubber-like elastic body and tension is applied between the embossed steel sheet and wound around the recoiler, the embossed steel sheet can be wound up without crushing the embossed steel sheet. A tension roll condition setting method that is set using a maximum allowable load “q × L” calculated by the maximum allowable load calculation method under embossed steel sheet reduction according to claim 1 or 2,
When the rolling force of the tension roll is P, the radius of the tension roll is R, the friction coefficient of the outer peripheral surface of the tension roll is μ, and the nip width of the tension roll is Dmm, the following expressions (11) and (12) are satisfied. A tension roll condition setting method, wherein the R, μ, D, P, and L are determined under conditions.

However, P ≦ q × L (or 1 ≦ q × L / P) (12) 4. The tension according to claim 3, wherein when R, μ, and L are determined, the rolling force P is set so that the nip width D satisfies the following expression (1 of 13). Role condition setting method.

However, P ≦ q × L (or 1 ≦ q × L / P) (12) When the embossed steel plate has a thickness tmm and a plate width Wmm, the minimum back tension τkg / mm ² per unit cross-sectional area capable of winding the embossed steel plate loosely around a recoiler is obtained, and the rolling force P is determined as follows: It sets so that Formula (17) may be satisfy | filled, The condition setting method of the tension roll of any one of Claims 3-4 characterized by the above-mentioned.
W × t × τ / μ ≦ P (17)

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