JPH0681642B2 - Bridle device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bridle device used in a thin plate processing line, a rolling line, or the like.

(Prior Art) A bridle device has been conventionally used as a device for applying a predetermined tension to a strip or the like, in combination with various facilities. For example, in the example shown in FIG. 2A, when the bridle device 10 is arranged in front of and behind the rolling mill 11, FIG.
Shows an example in which the bridle device 10 is provided before and after the equipment including the rolling mill 11 and the tension leveler 12, and FIG. 7C shows an example in which the bridle device 10 is installed before and after the tension leveler 12. Recently, galvanizing line,
A rolling mill and a straightening machine are often installed in a continuous annealing line, a pickling line, or the like on the inlet side or the outlet side, but they are often used as a tension applying means for these facilities, or each section of the line. It has come to be used as a tension control means for maintaining the tension level of the.

The tension in the bridle device is such that the strip is wound around a roll, and the strip and the bridle roll (hereinafter,
It is caused by a difference in the pulling force between the entrance side and the exit side of the roll due to the frictional force with the roll. The principle of tension generation will be described with reference to FIGS. 3 (a) and 3 (b). Figure 3 (a), the time of the strip St is moved in the direction of the arrow, (consisting of high-tensile T ₂ in low tension T ₁₎ when the tension toward the outlet side from the inlet side of the roll 1 is reduced Is called a pull bridle, and as shown in FIG. 2B, when the tension on the exit side of the roll 1 increases from the entrance side (from a low tension T ₁ to a high tension T ₂ ) it is called a drag bridle. Thus, although the elastic strain changes as the tension of the strip St increases and decreases, slippage occurs between the surface of the roll 1 and the strip St because the peripheral speed of the roll 1 is constant. A portion where this slippage occurs, that is, a portion that contributes to the increase or decrease in tension is referred to as a slip zone Sp, and a portion where the peripheral speed of the roll 1 and the moving speed of the strip St match and there is no slippage is referred to as a stick zone Sk. In such a state, the relationship of T ₂ = T ₁ e ^μθ holds. From this equation, it can be seen that the tension can be increased as θ increases. To increase this θ, the number of rolls may be increased, and a large tension can be obtained by increasing the number of rolls. Here, the μ is a dynamic friction coefficient between the strip St and the roll 1, and the θ is a solid angle of the strip St with respect to the roll 1.

Next, a roll used in this bridle device will be described. FIG. 4 (a) is a roll longitudinal sectional view of a bridle device which has been conventionally used.
Is composed of an arbor 2, a sleeve 3, and a side plate 4 for fixing both members. The surface of the sleeve 3 is formed with appropriate roughness by shot blasting or the like so as to obtain a desired coefficient of friction, and surface hardness or plating is applied to improve wear resistance of the surface. . The bridle device is a roll of two to several rolls.
As a set, they are rotationally driven by a motor or a differential mechanism, not shown.

By the way, there are many facilities with the bridle device installed side by side as described above, but the coils or strips processed or treated by these facilities are often high in temperature, and there are problems peculiar to each facility. . That is, when pickling a hot rolled coil, if the temperature of the coil is high, the pinch roll or rubber roll of the pickling facility will be damaged, so the coil will be air-cooled for 48 hours or more, then cooled to 80 ° C or less and then pickled. . In order to shorten the long air cooling time, if water is cooled with a rolling mill or a tension leveler installed on the inlet side of the pickling equipment, a water film forms on the surface of the bridle roll and slips occur, causing flaws and fluctuations in tension. You

When the annealed material is skin-passed, flaws and flatness are inspected on the exit side of the skin-pass mill, but if the temperature of the strip is high, rolling oil fumes may be generated and the inspection personnel may be burned. It is allowed to cool to 40 ° C or less over 24 hours.

When performing a skin pass on the exit side of the continuous annealing line, if the strip temperature is high, the waist will break. Due to the decrease in temperature, the annealing line is operated at a reduced speed, resulting in a decrease in efficiency. If water is used for cooling, rusting is inevitable.

When a rolling mill or a tension leveler provided on the exit side of the galvanizing line is provided, zinc adheres to the rolls when the strip temperature is high, and therefore the line speed is reduced and the operation rate is low.

(Problems to be Solved by the Invention) An object of the present invention is to add a cooling function to a bridle device that is used as a tension control means, which is installed in combination with various equipment such as a rolling mill, a tension leveler or a pickling line. Another object of the present invention is to provide a new bridle device which has the above-mentioned problems and can solve the above-mentioned problems.

(Means for Solving the Problems) The inventors of the present invention have conducted various studies on bridle devices used in combination with rolling mills, tension levelers, etc., and as a result, cooled the strip in a dry state by the bridle devices ( Recognizing that the above problems can be solved at once if it can be cooled without sprinkling water, and that the dry cooling is possible if the roll of the bridle device has an appropriate structure. Get
Completed this invention. That is, the gist of the present invention is a bridle device using "one or more rolls having a roll body composed of an arbor and a sleeve, the arbor and the sleeve being shrink-fitted, and having a cooling medium passage between the arbor and the sleeve. Also, there is an uneven portion on the sleeve surface of the roll, the top area S ₁ of this uneven portion is 50% or more of the sum S of the top area and the bottom area, and the amount of change in the top area S ₁ due to wear. Is within 10% of the bridle device using one or more rolls ".

(Operation) Hereinafter, the bridle device of the present invention will be described. The bridle device of the present invention not only applies tension to the strip and cools the strip, but is particularly characterized by its roll structure. As shown in FIG.
The roll 1 used in the bridle device of the present invention is composed of an arbor 2 and a sleeve 3, and the arbor 2 and the sleeve 3 are strongly joined by shrink fitting, and the sleeve 3 is expanded by heat input from the strip. However, since the arbor 2 and the sleeve 3 are designed to hold the interference, no thermal crown is generated. In addition, appropriate irregularities are formed on the roll surface so that the cooling ability does not change even if the roll wears. Therefore, like a conventional roll, a thermal crown is formed by the heat input from the strip, the tension generated in the center of the strip becomes large, and the shape of the strip becomes defective. There is no difference.

The bridle device of the present invention will now be described in detail.

(1) Roll structure When the conventionally used roll 1 as shown in FIG. 4 (a) is used in the bridle device, heat is transferred from the portion around which the strip is wound to the sleeve 3, and this heat is transferred. Conducting in the axial direction to generate a temperature distribution, and as shown in FIG. 4 (b), a thermal crown (middle high crown) is generated. When the roll is formed with a crown, a tension distribution occurs in the width direction of the strip, resulting in a defective shape. Therefore, as shown in FIG. 1, the roll used in the bridle device of the present invention does not form a thermal crown, so that the arbor 2
The cooling medium passage 5 is provided between the sleeve 3 and the sleeve 3. Sleeve 3 as arbor 2 is cooled
Does not deform and thermal crown does not occur. To join the arbor 2 and the sleeve 3, brazing,
Although there are uses of adhesives, welding, etc., shrink fitting is preferable in order to secure a tightening margin in which joining is maintained even if the temperature of the sleeve rises, and in the present invention, joining is performed by shrink fitting. Further, in FIG. 1, the cooling medium passage is formed in a spiral shape on the circumference of the arbor 2, but it is possible to join by shrink fitting without causing a proper amount of cooling water to flow to cause a thermal crown. For example, the shape and flow direction of the cooling medium passage are not limited to these.

(2) Concavo-convex shape of sleeve surface The concavo-convex shape formed on the sleeve surface of the roll has a great influence on the friction coefficient and the cooling capacity of the roll. For example, when the roll surface is rough-formed by shot blasting, electric discharge machining, etc., the cross-sectional shape of the roll surface is usually as shown in FIG.
It becomes a mountain shape as shown in. When such a roll is used and worn, as shown in FIG. 5 (b), the cross-sectional shape of the surface becomes trapezoidal and the contact area between the strip and the roll changes. If you just want to apply tension to the strip,
This degree of wear does not cause much difference in the bridle function, but when the cooling action is also used, the change in the contact area greatly affects the cooling function. Therefore, the shape of the roll surface used in the apparatus of the present invention is a square shape having an uneven cross section as shown in FIG. 6 (a). In the case of the rectangular shape, even if the surface is worn as shown in FIG. 6 (b), the contact area between the strip and the roll hardly changes, so that the cooling ability is not affected. The irregularities do not have to be perfectly rectangular and may be slightly trapezoidal or inverted trapezoidal. In the present invention, the top area S ₁ of the unevenness is
(The portion shown in FIGS. 7 and 8) is 50% or more of the sum S of the top area and the bottom area, and the change in the top area S _{1 due} to wear is within 10%. With such a shape, the cooling ability does not change and flatness does not occur so much that the strip is adversely affected.
When the top area S ₁ is 50% or less of the sum S of the top and bottom areas, no matter how evenly the top areas S ₁ are geometrically distributed,
The non-contact area becomes large and flatness is likely to occur due to uneven cooling. The unevenness can be formed by lathe, knurling, laser, corrosion, etc. The top and bottom groove areas of the unevenness are 1 to 25 mm ^{2 in} terms of frictional force and cooling ability, and groove width. Is preferably about 0.5 to 9 mm.

(2) Regarding the Number of Rolls In the present invention, the rolls having the structures of (1) and (2) above are used, but it is sufficient to have at least one roll having this configuration, and the required frictional force is required. Alternatively, if the cooling capacity is to be obtained, the number may be increased appropriately.

(4) Roll Driving The roll driving means is not particularly limited, but in the case of generating the torque corresponding to the frictional force between the strip and the roll to increase or decrease the strip tension to control the elongation rate. , The distribution gear unit, the power distribution reduction gear unit, the elongation control gear unit, etc. are mechanically connected and mechanically connected to the inlet and outlet bridle drive units, and it is desirable to drive them by the main motor and the elongation control motor. When tension control is performed, each roll may be driven individually.

Hereinafter, the bridle device of the present invention will be specifically described with reference to some embodiments.

(Example 1) In this example, a tension leveler (four extension rolls having a diameter of 80 mm, in which a bridle device was installed on the inlet side of the pickling line,
It has one straightening roll with a diameter of 120 mm and two straightening rolls with a diameter of 280 mm). The entrance side bridle device is provided with three rolls, each roll is connected to a 37Kw, 60Kw, 100Kw motor, and the exit side bridle device is provided with five rolls. Each roll is 200Kw, 145Kw, 75K
It is connected to w, 60Kw and 50Kw motors and both bridle devices can generate up to 30 tons of tension. The dimensions of the bridle roll are 150 mm in diameter and 15 in length.
80 mm, the roll has a width of 25 mm and a depth of 12 mm on the outer circumference.
Inner surface of the groove and sleeve formed on the arbor, which is composed of an arbor with a diameter of 1456 mm in which a spiral groove of a strip is formed and a sleeve with a wall thickness of 22 mm joined to this arbor at a shrink fitting margin of 0.5 mm / radius The cooling medium passage is configured by. As shown in FIG. 7, the surface of the sleeve has a top area S ₁ of 16 mm ² (4 mm × 4 m
m), bottom groove width of 1.5 mm, depth of 1.5 mm (in this case
S ₁ becomes 53% of S), and chrome plating is applied on it. In order to make the cooling of each roll uniform, a maximum of 20 m ³ / h of cooling water is made to flow from the left and right of the spiral groove formed in two rows by 10 m ³ / h.

The hot rolling coil was leveled and pickled by the bridle device having such a structure. The temperature of this hot rolled coil was 150 to 250 ℃, but since it was cooled to about 40 ℃ by the bridle device, the rubber lining roll and urethane lining roll of the pickling equipment were not damaged by heat at all. Since the hot coil can be used, the coil cooling time in the hot rolling process can be shortened by 60 to 70% compared to the conventional method. Also, under the same conditions as in this embodiment,
Top area S ₁ is 9 mm ² (3 mm × 3 mm), bottom groove width is 1.5 mm, groove depth
When a roll having a large number of irregularities of 1.5 mm (in this case, S ₁ is 44% of S) was used, some flatness collapse occurred. In this example, it was confirmed that the cooling ability was almost the same even when the spiral groove was provided on the inner surface of the sleeve and the surface of the arbor was made to be a strut.

(Example 2) In this example, the bridle device is arranged in front of and behind the skin pass mill. The roll used in this bridle device has a diameter of 800 mm and a length of 1340 mm, and the roll has a cylindrical arbor having a diameter of 762 mm in which a groove having a width of 22 mm and a depth of 12 mm is spirally formed. Shrinkage allowance on this arbor
A sleeve having a wall thickness of 19 mm joined at 0.4 mm / radius is formed, and the groove of the arbor and the inner surface of the sleeve constitute a cooling medium passage. The surface area of this sleeve has a top area S ₁ of 3.75 mm ² (1.5 mm × 2.
5mm), bottom groove width 0.5mm, depth 1.0mm innumerable irregularities (S _{1 in} this case is 62.5% of S) are formed, and chromium plating is applied on it. Cooling water is supplied to this roll by 10 m ³ / h from the left and right of the two spiral grooves, up to 20 m ³ / h. This bridle device is driven by a differential mechanism so that the strip elongation rate can be controlled up to 3%. The annealed coil was temper-rolled by a skin pass mill equipped with such a bridle device. The temperature of the annealing coil was 65-80 ° C, but since it was cooled to about 20 ° C by the bridle device, steam was not generated from the rolling oil even if the skin passed, and the flaw inspection could be easily performed. . Conventionally, the coil is about
Since it was extracted at 100 ℃ and cooled to 40 ℃ or less over 24 hours and then skin-passed, the cooling time is greatly shortened compared to this, and the amount of work in progress can be reduced.

(Example 3) The bridle device of the present invention was placed side by side with an inline skin pass mill arranged on the outlet side of the continuous annealing line. By providing the bridle device, the cooling zone of the continuous annealing line and the skin pass mill can be brought close to each other, and the line length can be shortened. Also, in the past, the line speed was reduced to operate in order to lower the strip temperature before the skin pass mill, but the bridle device did not have to reduce the speed, which improved production efficiency.

(Example 4) The bridle device of the present invention was named for the equipment of the skin pass mill and the leveler provided on the outlet side of the galvanizing line. Since the strip after plating can be cooled by the bridle device, zinc pick-up to the rolls of the skin pass mill and the leveler is eliminated, the maintenance frequency of these rolls and the roll replacement frequency can be reduced, and the line utilization rate is improved.

(Effects of the Invention) As described above, when the bridle device of the present invention is used, the tension of the strip can be controlled, and at the same time, the strip can be cooled. The effect is extremely large, such as improvement of efficiency or operation rate and shortening of production line.

[Brief description of drawings]

FIG. 1 is a sectional view of a bridle roll used in the bridle device of the present invention, FIG. 2 (a) is a diagram of an example in which the bridle device is provided before and after a rolling mill, and FIG. 2 (b) is a bridle device. Fig. 2 shows a case where the rolling mill is installed in front of and behind the tension leveler, Fig. 2 (c) shows an example of installing the bridle device before and after the tension leveler, and Figs. 3 (a) and 3 (b) show FIG. 4 (a) is a cross-sectional view of a conventional bridle roll, and FIG. 4 (b) is a roll shown in FIG. 4 (a) in which a thermal crown is formed by heat input. FIG. 5 (a) is a view showing a cross-sectional shape of a surface portion of a conventional roll sleeve, and FIG. 5 (b) is a cross-sectional view showing a worn state of the sleeve, FIG. a) is used in the bridle device of the present invention 6 (b) is a cross-sectional view showing the state of the surface of the bridle roll, and FIG. 6 (b) is a cross-sectional view showing the state after the wear of the same sleeve, and FIGS. Fig. 1 is bridle roll, 2 is arbor, 3 is sleeve,
4 is a side plate, 5 is a cooling medium passage, 10 is a bridle device, 11
Is a rolling mill and 12 is a tension leveler.

Claims (2)

[Claims] 1. A roll body comprising an arbor and a sleeve, the arbor and the sleeve being shrink-fitted, and at least one roll having a cooling medium passage between the arbor and the sleeve is used. The characteristic bridle device. 2. A roll body is composed of an arbor and a sleeve, the arbor and the sleeve are shrink-fitted, and a cooling medium passage is provided between the arbor and the sleeve. and a top area S ₁ is 50% or more of the sum S of the top area and the bottom area, and the amount of change in the top area S ₁ due to wear is characterized by using one or more rolls within 10% Bridle device.