JPH0671337A - Method for coiling steel sheet - Google Patents

Abstract

PURPOSE:To effectively prevent a kink phenomenon by forming a low tension layer on a winding coil and satisfying a specified condition on the low tension layer. CONSTITUTION:After a steel sheet 7 of <=0.5mm in plate thickness is annealed (continuous annealing included), it is coiled on a tension reel 6 of the outlet side reel. In that case, the low tension layer is formed on the winding coil and the following expressions I, II, III are satisfied on the low tension layer. 2kg/mm<2=Ta<=4kg/mm<2>...1, Ta=4kg/mm<2>XAXBXCXD...II, Ta<Tb...III, where Ta: tension at start of coiling, Tb: tension at the stationary part, A: coefficient by plate thickness, B: coefficient by deformation resistance of steel sheet, C: coefficient of surface roughness of steel sheet, D: coefficient of paint. In this way, the cost of equipment can be reduced and the yield of steel sheet be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel plate winding method capable of effectively preventing a kink phenomenon which occurs after winding a reel on the line exit side of a thin steel plate such as a cold rolled steel plate.

[0002]

2. Description of the Related Art When a thin steel sheet having a thickness of 0.5 mm or less is wound on a reel on the line exit side, a kink phenomenon as shown in FIG. 1 occurs in a coil after winding. However, as means for preventing such a kink phenomenon, conventionally, there are generally a method of inserting a sleeve into the inner diameter of the coil and a method of dividing the coil to prevent the kink phenomenon.

Further, in Japanese Examined Patent Publication No. Sho 64-28647, a strip rolled to a plate thickness of 0.3 mm or less through a final stand is provided with a tension control device installed between the final stand and a tension reel so that the tension on the final stand exit side is increased. 5
Within the range of ~ 16kg / mm ² , winding tension is 4 ~ 7kg / mm
It is proposed that the tension be within the range of ² and that the winding tension be controlled to be smaller than the tension at the final stand exit side.

Further, Japanese Patent Laid-Open No. 3-198915 discloses a method of forming a low tension layer when winding a cold rolled steel sheet having a sheet thickness of 0.25 mm or less.

[0005]

The above-mentioned conventional sleeve loading method, which has been generally adopted, has the disadvantages that the equipment cost is high and the costs of sleeve collection and sleeve transportation are high. Further, the method of splitting the coil has a drawback that the yield is significantly reduced and at the same time, the efficiency is poor.

According to the Japanese Patent Publication No. 64-28647, it is possible to eliminate breakage and other disadvantages of the thin strip, but the entire coil winding process is performed under uniform tension conditions. It is not always possible to effectively prevent the occurrence of kinks in the formed coil.

Further, according to the above-mentioned Japanese Patent Laid-Open No. 3-198915, the tension when the annealed steel sheet is wound by the tension reel on the delivery side is 3 to 4 kg / mm, even if a certain amount of kink can be eliminated. ^The intermediate tension is as low as 0.6 to 0.8 kg / mm ² when the inner winding tension is 0.2, which means that the steel plate meanders and the inner diameter is crushed to prevent normal winding, and also the intermediate low tension. By providing the layer, many adverse effects such as a large number of scratches are generated, and a preferable result cannot be obtained.

[0008]

SUMMARY OF THE INVENTION The present invention was devised after repeated studies to solve the problems in the prior art as described above, and it is possible to specify the present invention without performing sleeve insertion or coil division. The present invention succeeds in efficiently preventing the occurrence of kinks by providing the low-tension portion of No. 1 as follows.

When winding a steel plate having a plate thickness of 0.5 mm or less on the reel on the delivery side after annealing (including continuous annealing), a low tension layer is formed on the winding coil, and a low tension layer is formed in the low tension layer. Formula I,
A steel sheet winding method characterized by satisfying II and III. 2kg / mm ² ≦ Ta ≦ 4kg / mm ² ─────I Ta = 4kg / mm ² × A × B × C × D ──II Ta <Tb ──────────── ─── III where Ta: coil tension at start of coil Tb: tension at steady part A: coefficient by plate thickness B: coefficient by deformation resistance of steel plate C: coefficient by surface roughness of steel plate D: oil coating coefficient

[0010]

In the coil wound on the reel, a cushion function is obtained by forming a low tension layer such as a coil winding start portion as shown in FIG.
It is possible to reduce the compressive stress exerted on the inner wall of the inner wall a, and thus prevent the kink phenomenon in the inner diameter portion a.

From the results of many experiments conducted by the present inventors, the position where the low tension layer is formed is 10 to 10 mm from the inner diameter position.
It is effective to select within the range of 30 mm, and preferable kink phenomenon prevention can be obtained. Further, specifically, it is effective to appropriately increase or decrease the position range depending on the plate thickness of the steel plate, the deformation resistance, the surface roughness, and the amount of oil applied.

As shown in FIG. 3, the tension Tb in the low tension portion is in the range of ² kg / mm ² ≦ Ta ≦ 4 kg / mm ² . The reason why the upper limit is set to 4.0 kg / mm ² is that if the upper limit is exceeded, the difference with the steady tension part is small even in the low tension part, and the probability of kinking increases. . The lower limit is set to 2 kg / mm ² because if it falls below this, meandering of the plate and crushing of the inner diameter occur, and normal winding cannot be performed. The specific tension condition in the low tension portion A is such that the tension pattern of the low tension portion is in the range of 10 to 30 mm such as the inverted trapezoidal type as shown by the solid line in FIG. 3 or the step type as shown by the one-dot chain line. can do.

By setting Ta ≦ Tb, the tension of Ta, which is the winding start portion, is made smaller than that of Tb, which is the steady portion, and the high kink occurrence rate at the winding start portion is effectively prevented, and at the time of coil winding. Suppress the occurrence of slip in.

As described above, the winding start portion Ta is Ta = 4 kg / mm ²
By using xAxBxCxD, the coefficients depending on the plate thickness, the deformation resistance, the surface roughness, and the oil amount shown in Fig. 7 are used, that is, the plate thickness, the deformation resistance, the surface roughness, and the oil amount. By making adjustments in consideration of the influence of, it is possible to obtain the tension condition with which an accurate effect can be obtained.

[0015]

EXAMPLE A concrete example of the method according to the present invention will be described. A block diagram of FIG. 4 is a block diagram of FIG. 4 showing an outline of a kink occurrence prevention method carried out by the present inventors. In the equipment having the machine 8 or trimmer 17 and the oil coating device 18, the control device 3 that creates the target tension pattern and the tensiometer 1 that measures the tension of the tension reel are used, and the output from the computer 9 and the control device 3 is used. , The output of the tensiometer 1 provided on the steel plate 7 between the temper rolling mill 8 and the tension reel 6 is the automatic tension control means (AT
It is guided to the tension control system 2 which is C), and the tension control system 2 is connected to the electric motor 5 for driving the tension reel 6 through the automatic current adjusting mechanism 4.

That is, the tension of the steel plate 7 is measured, the output from the controller 3 and the output from the tensiometer 1 are sent to the tension control system 2, and the current is adjusted to the drive motor for the tension reel 6. It is configured to be fed back and wound by a predetermined tension obtained by the control device 3.

In addition, as shown in FIG. 5, the tension meter 1 is provided between the bridle roll 15 and the tension reel 6 which are designed to prevent the steel sheet from slipping, as shown in FIG. The electric motor 5 for driving the tension reel 6 may be controlled in the same manner as described above by using the generated output and the output from the control device 3 that creates the target tension pattern. Further, as shown in FIG.
Alternatively, the output from the control device 3 that creates the target tension pattern (current reference of the electric motor 5) may be directly input to the ACR 5 without being provided.

Explaining a concrete operation example according to the present invention, a cold rolled steel sheet having a thickness of 0.25 mm and a total crown of 2% after annealing is as shown in FIG. 4 (A) or (B). When temper rolling or oil coating was performed by the equipment, the inner diameter portion A and the steady portion B as shown in FIG. 3 were wound under tension conditions as shown in Table 1 below.

[0019]

[Table 1]

The following Table 2 shows the results of the examination of the occurrence of the kink phenomenon, the plate meandering and other coil properties of the obtained coils.

[0021]

[Table 2]

That is, the coil Nos. 1 and 2 are the case where the inner diameter portion and the steady portion are wound under the same tension condition. In this case, the tension of the steady portion is strong and the occurrence of the kink phenomenon is recognized.

In the case of coil Nos. 3, 4 and 8, the inner diameter tension is smaller than the steady portion tension. In this case, the inner diameter tension is properly exerted, no kink is observed, and the coil properties are good. It was confirmed that the coil winding was good.

In the case of the coil No. 5, the tension in the inner diameter portion was too low and the kink phenomenon did not occur, but a slight collapse of the inner diameter was confirmed after the coil was removed.

With coils Nos. 6 and 9, the tension in the inner diameter is low and the kink phenomenon does not occur, but meandering occurs during the winding of the steel sheet, and the coil cannot be wound normally. In addition, the inner diameter collapsed when the coil was pulled out, and the inner diameter jumped out during the coil transportation.

In the case of coil No. 7, the tension in the inner diameter portion was smaller than the tension in the normal portion. In this case, the tension in the inner diameter portion was slightly strong, and a tendency of the kink phenomenon to occur was recognized.

In the example, the temper rolling after the box annealing and the recoil line with trim and oil applied after the temper rolling after the annealing have been described as an example. , Continuous annealing without temper rolling, winding of molten galvanized steel strip with continuous annealing after annealing, winding after tension leveling after continuous annealing, and Renson leveler line after passing through other processing lines after annealing. It can also be applied to the winding up of

[0028]

As described above, according to the present invention, it is possible to effectively prevent the kink phenomenon which is unavoidable in the prior art when winding a thin steel plate having a plate thickness of 0.5 mm or less. In addition, there is no need for a sleeve device, etc., and preferable coil winding can be performed without the need for further coil division, which has the effects of reducing equipment costs and improving the yield of steel sheets. This is an invention that is industrially highly effective.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a kink phenomenon occurs in a conventional steel plate coil.

FIG. 2 is a perspective view showing a structural relationship between an inner diameter portion of a steel plate coil and a steady portion via a low tension portion of the present invention.

FIG. 3 is a table summarizing the relationship between each part of the coil and the tension according to the present invention.

FIG. 4 is a block diagram showing an outline of an apparatus for carrying out the method of the present invention.

FIG. 5 is a block diagram similar to FIG. 4, showing another example thereof.

FIG. 6 is a block diagram similar to FIG. 4, showing still another example thereof.

FIG. 7 is a chart summarizing the relationship of each coefficient in the present invention.

[Explanation of symbols]

1 Tension meter 2 ATC control system 3 Control device (programmable logic controller) 4 Automatic current adjustment mechanism 5 Driving motor 6 Tension reel 7 Steel plate 8 Rolling machine 9 Calculator 11 Pinch roll 12 Shearing machine 13 Pass line roll 14 Deflector roll 15 Bridle roll 16 Payoff reel 17 Trimmer 18 Oiling device

Claims (1)

[Claims] 1. When winding a steel sheet having a thickness of 0.5 mm or less on a reel on the delivery side after annealing (including continuous annealing), a low tension layer is formed on a winding coil, and the low tension layer is formed. In the method for winding a steel sheet, the following formulas I, II, and III are satisfied. 2kg / mm ² ≦ Ta ≦ 4kg / mm ² ─────I Ta = 4kg / mm ² × A × B × C × D ──II Ta <Tb ──────────── ─── III where Ta: coil tension at start of coil Tb: tension at steady part A: coefficient by plate thickness B: coefficient by deformation resistance of steel plate C: coefficient by surface roughness of steel plate D: oil coating coefficient