JP2005262234A - Method and apparatus for adjusting oil film on metal strip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for adjusting an oil film on a metal strip in an oil film adjustment line in which a coil of the metal strip is uncoiled, wiped by a wiping device and re-coiled after adjusting the oil film on the surface of the metal strip. <P>SOLUTION: The oil film thickness on the surface of a metal strip after being wiped by a wiping device is measured, and/or the temperature on the surface of the metal strip after being wiped by the wiping device is measured. On the basis of the measured oil film thickness and/or the measured temperature, the heating power of a coil heating device is regulated so as to realize the set oil film thickness, the regulated heating power is applied to the coil heating device, and the outer circumferential surface of the coil to be uncoiled is heated. Thus, the metal strip can be wiped so that the oil film on the metal strip reaches the predetermined oil film thickness by adjusting the viscosity of the oil film on the surface of the uncoiled metal strip. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method and apparatus for adjusting the oil film thickness on the surface of a metal strip, and in particular, when unwinding and wiping a coil of a metal strip, the oil film thickness of the metal strip after wiping is made constant. .

  The metal strip is alternately wound and unwound by two reels, rolled by reciprocating a rolling mill, and finished by gradually reducing the thickness.

  When rolling metal strip, rolling oil is used for the purpose of suppressing heat generation and lubrication. And after rolling, there are a case where degreasing and removing the rolling oil completely, and a case where the rolling oil is attached while shipping.

  In such a rolling apparatus for rolling a metal strip, an oil film of metal foil rolling that conventionally controls the oil temperature supplied to the rolling mill in accordance with the detection signal of the oil film thickness meter and makes the oil film surface constant. A thickness adjustment method is known (see Patent Document 1).

  However, in general metal foil rolling apparatuses, a simple wiping apparatus for oil film cutting is only provided, and there are almost no cases where the oil film thickness is controlled to be constant, and it is rare.

  The wiping device may be attached to the rolling mill in the rolling equipment, but for example, there may be a wiping line for wiping with the wiping device as shown in FIG.

  For example, in the wiping line shown in FIG. 5, after winding the metal strip coil 1a and passing the wiping device 4 to wipe the oil film on the metal strip surface, the coil 1b is wound again on the metal strip coil 1b. It is a line that performs processing to be taken. Here, 2, 3 are conveyance rolls.

  The wiping device 4 is a device that, for example, presses a wiper blade such as rubber against the front and back surfaces of the metal strip with a predetermined pressure while conveying the metal strip, and makes the oil film thickness on the metal strip constant. The method is not particularly limited, and includes a device for wiping by blowing air or the like.

  By the way, the metal strip may be required to be oiled before shipment to a customer for rust prevention or to improve workability in a press or the like. In that case, normally, oil which has adhered by rolling is once degreased and then oiled again. Otherwise, it is difficult to obtain a certain oil film thickness due to the influence of rolling oil. Therefore, it is necessary to add a degreasing process after rolling and an oiling process in the annealing or finishing process.

  In addition, it is possible to ship with the rolling oil attached, but there may be a problem in workability at the customer's press etc. When using the rolling oil as it is, the rolling oil It is required that the oil film thickness is constant and that the metal strip is uniformly attached in the longitudinal direction and the width direction.

However, with a simple wiping device attached to a rolling mill, it is difficult to make the oil film thickness constant, and it is known that the oil film thickness is uneven. Also, as disclosed in Patent Document 1, controlling the oil temperature of the rolling oil supplied according to the detection signal of the oil film thickness meter, and when trying to obtain a constant oil film thickness, the apparatus for that becomes complicated, Since the adjustment also takes time, it is difficult to stably obtain a constant oil film thickness at a low cost.
JP-A-10-235410

  When the rolling oil adhering to the surface of the metal strip is wiped by pressing rubber or the like against the surface of the strip, the oil film thickness after wiping changes depending on the pressing pressure, rubber hardness, shape, or the like. For this reason, in order to obtain the required oil film thickness, conditions such as pressing pressure are found and wiping is performed under optimum conditions.

  However, when the temperature of the metal strip changes due to a change in the outside air temperature, the viscosity of the oil attached to the surface changes, and the oil film thickness changes. For this reason, it has been necessary to frequently change the wiping pressing pressure, rubber hardness, and the like according to the target oil film thickness and metal strip temperature.

  Further, the rolled metal strip may be slit to the width required by the customer or the lot weight may be adjusted. Furthermore, a surface inspection may be performed. Therefore, it is not necessary to keep the oil film thickness constant after rolling with a rolling mill, and after performing these treatments, in the refining process, the oil film thickness of the rolling oil on the metal strip is made constant, and the uniform oil film thickness There is no problem even if it is obtained.

  The present invention is applied to a wiping line in a refining process, and provides an oil film adjustment method and apparatus for a metal strip that maintains a good wiping property and makes the oil film thickness constant by adjusting the viscosity of the oil. The purpose is to do.

(1) The present invention is an oil film adjustment method for a metal strip in an oil film adjustment line in which a coil of a metal strip is rewound, wiped with a wiping device, and the oil film on the surface of the metal strip is adjusted and wound around the coil again. Measuring the oil film thickness on the surface of the metal strip after wiping with a wiping device, and / or measuring the temperature of the surface of the metal strip after wiping with a wiping device, and measuring the oil film thickness and / or the Based on the temperature, the heating power of the coil heating device is adjusted so that the set oil film thickness is obtained, the adjusted heating power is applied to the coil heating device, and the outer peripheral surface of the coil to be rewound is heated. The above-mentioned problems have been solved by an oil film adjusting method for a metal strip, which comprises adjusting the oil film viscosity on the surface of the metal strip obtained by rewinding the metal strip.
(2) In the present invention, it is preferable that the coil heating device according to (1) is provided with a heating element along the outer peripheral surface of the coil to be rewound.
(3) Moreover, this invention rewinds the coil of a metal strip, wipes with a wiping apparatus, adjusts the oil film on the surface of a metal strip, and winds around a coil again, The oil film adjustment apparatus of the metal strip in an oil film adjustment line A wiping device for wiping a metal strip, an oil film thickness meter for measuring the oil film thickness on the surface of the metal strip after wiping with the wiping device, and / or a metal strip after wiping with the wiping device A thermometer that measures the temperature of the plate surface, an oil film thickness setting device that sets a desired oil film thickness setting value, a coil heating device that heats the coil to be rewound, and a power regulator that adjusts the power applied to the coil heating device And an oil film thickness control device that adjusts the power applied to the coil heating device so as to obtain a set oil film thickness based on the measured oil film thickness and / or temperature. The above-mentioned problems have been solved by the oil film adjusting device for metal strips characterized by the above.
(4) In the present invention, it is preferable that in the invention (3), the coil heating device includes a heating element disposed along an outer peripheral surface of a coil to be rewound.

  By applying the present invention, it is not necessary to add a new degreasing process and to newly install an oiling device, and even when the outside air temperature changes, the surface of the metal strip using a simple wiping device of the wiping line The oil film thickness can be kept constant. Therefore, it is possible to provide a metal strip having a certain oil film thickness that matches the required oil film thickness throughout the year regardless of summer or winter.

  The best mode for carrying out the present invention will be described with reference to FIG.

  The present invention makes it possible to provide a metal strip having a uniform oil film thickness by making the rolling oil applied during rolling constant by using a wiping device.

  In the present invention, in addition to the above-described invention for providing a metal strip having a uniform oil film thickness, a coil heating device 10 for heating the outer peripheral surface of the coil 1a for rewinding the metal strip is provided, the metal strip before wiping is heated, and an oil film is provided. Wiping is performed while reducing the viscosity of The coil heating device 10 will be described later.

  The heating control by the coil heating device is performed by adjusting the power supplied to the heating element by the power regulator 9.

  The oil film thickness after wiping with the wiping device 4 is measured with the oil film thickness meter 6, and the measured oil film thickness value is fed back to the oil film thickness control device 7, and the oil film thickness setting value set with the oil film thickness setting device 8 is input. Reference is made to control the power regulator 9 so that the oil film thickness of the metal strip becomes a desired oil film thickness. Here, instead of the oil film thickness meter 6, the temperature of the surface of the metal strip is measured using the thermometer 5, and the measured temperature is fed back so that the oil thickness of the metal strip becomes the desired oil thickness. Alternatively, the power regulator 9 may be controlled. It goes without saying that control may be performed so that a desired oil film thickness is obtained by using feedback inputs from both the oil film thickness meter 6 and the thermometer 5.

  The control method in the oil film thickness control device 7 is not particularly limited as long as it is controlled based on the measured oil film thickness and / or temperature, and simple feedback control may be applied.

  Next, the coil heating apparatus 10 newly developed for the present invention will be described.

  Various heating methods for heating the metal strip to a constant temperature are conceivable. However, since it is necessary to incorporate the device into existing equipment, the heating device can be used in a limited space and has a wide heating area. Must be used. Further, it is necessary to make the heating time of the metal strip as long as possible and to make the volume of the apparatus as small as possible.

  In view of the above points, the inventors have newly developed a coil heating apparatus 10 shown in FIG. 1 and applied it to the present invention.

  This coil heating device 10 is a device that heats a metal strip in the state of a coil before the metal strip is rewound, and this device can heat the metal strip and keep the temperature uniform. It can be easily performed and the oil film thickness after wiping can be made constant.

  The coil heating device 10 is designed to be compact because it needs to be housed in a metal strip rewinding facility, and is configured by disposing a heating element 11 along the outer peripheral surface of the coil 1a to be rewinded. Moreover, as shown in FIG. 1, the effect as a heating apparatus can also be achieved by covering a portion of the outer peripheral surface of the coil, for example, a half-circumferential portion. By doing so, a wide range of the metal strip can be heated most efficiently in a narrow place.

  In order to verify the performance of the coil heating device 10, as shown in FIG. 2, the coil 1c of the metal strip was not rewound and heated at a constant speed of 15.5 mpm at a peripheral speed. Here, the distance between the outer peripheral surface of the coil 1c and the heating element 11 was 350 mm. Further, as the heating element 11, 21 infrared heaters having a rating of 2 kW were disposed along the outer peripheral surface of the coil.

  FIG. 3 shows a graph of the verification result. 3 shows the heating time on the horizontal axis, the position of the outer peripheral surface of the coil, the point A shown in FIG. 2 (a point 10 mm inside from the outer peripheral surface of the coil end surface), and the point B (a point 100 mm inside from the outer peripheral surface of the coil end surface) It is a graph which shows transition of the measurement temperature of 3 points | pieces.

  From FIG. 3, it was confirmed that the temperature increased at point A as the temperature increased at the outer peripheral surface position. On the other hand, there is almost no change in temperature at point B.

  That is, in the present invention, by using this coil heating device, not only the outer peripheral surface of the coil before rewinding but also the inner part of several turns in the vicinity of the outer peripheral surface can be preheated, and heating can be performed very efficiently. I understand that.

  In addition, by performing preheating for several minutes before rewinding, it is possible to heat several turns in the vicinity of the outer peripheral surface of the coil to be rewinded. The oil film adjustment of the metal strip can be applied, and the tip can be made into a product, so that the yield can be improved.

  In the wiping line having the specifications shown in Table 1, the stainless steel foil was wiped by applying the oil film adjustment method of the metal strip of the present invention. In addition, the specification of the coil heating apparatus applied to this invention is determined according to the specification of the target material shown in Table 1, and the wiping speed. In some cases, such as in summer, there is no need to heat with a coil heating device depending on the outside air temperature.

Here, if the oil adhesion amount, which is an index of the oil film thickness, is 0.20 g / m ² or less, it is considered acceptable.

  FIG. 4 shows the measurement results of the oil adhesion amount when the stainless steel foil temperature on the outlet side of the wiping device (also simply referred to as “wiping temperature”) changes from 10 ° C. to 40 ° C.

  FIG. 4 shows that when the temperature is 20 ° C. or less, the oil film has a high viscosity, and the amount of oil adhesion remains large even after wiping.

  That is, the allowable range of the wiping temperature in which the oil adhesion amount is within the acceptable range is 20 ° C. or higher, but it is preferable that the stricter target range in operation is 25 ° C. or higher.

  On the other hand, even if the temperature is raised too much, no significant improvement is observed in the amount of oil adhesion, so that the wiping temperature is preferably set to a target of 30 ° C. ± 5 ° C. as shown in Table 1.

  Based on the measured oil adhesion amount, that is, the oil film thickness, the power applied to the coil heating device was adjusted by the oil film thickness controller so that the oil film viscosity on the stainless steel foil surface was adjusted by the oil film thickness controller.

  The present invention makes it possible to adjust the oil film stably even when it is cold in winter, and to assure quality assurance of the oil film throughout the year.

It is a schematic diagram which shows the structure of the oil film adjustment apparatus of the metal strip of this invention. It is a schematic diagram which shows arrangement | positioning of the coil heating apparatus which heats the coil of a metal strip, and its outer peripheral surface. It is a graph which shows the relationship between heating time and temperature when it heats, rotating the coil of a metal strip at constant speed. It is a graph which shows the relationship between the stainless steel foil temperature of the wiping apparatus exit side, and the amount of oil adhesion. It is a schematic diagram which shows the conventional structure which wipes the oil film of a metal strip.

Explanation of symbols

1 Metal strip
1a, 1b (metal strip) coil 2, 3 transport roll 4 wiping device 5 thermometer 6 oil film thickness meter 7 oil film thickness control device 8 oil film thickness setting device 9 power regulator
10 Coil heating device
11 Heating element

Claims (4)

Rewinding the coil of the metal strip, wiping with a wiping device, adjusting the oil film on the surface of the metal strip, and winding it around the coil again, the method of adjusting the oil film of the metal strip in the oil film adjustment line,
Measure the oil film thickness on the metal strip surface after wiping with the wiping device, and / or measure the temperature on the metal strip surface after wiping with the wiping device,
Based on the measured oil film thickness and / or the temperature, the heating power of the coil heating device is adjusted so that the set oil film thickness is obtained,
A metal characterized in that the adjusted heating power is applied to the coil heating device and the outer peripheral surface of the coil to be rewound is heated to adjust the oil film viscosity on the surface of the metal strip obtained by rewinding the coil. How to adjust the oil film on the strip.   2. The method for adjusting an oil film of a metal strip according to claim 1, wherein the coil heating device includes a heating element disposed along an outer peripheral surface of a coil to be rewound. Rewinding the coil of the metal strip, wiping with a wiping device, adjusting the oil film on the surface of the metal strip and winding it around the coil again, the oil film adjuster of the metal strip in the oil film adjustment line,
A wiping device for wiping a metal strip;
An oil film thickness meter that measures the oil film thickness on the surface of the metal strip after wiping with the wiping device, and / or a thermometer that measures the temperature of the surface of the metal strip after wiping with the wiping device;
An oil film thickness setting device for setting a desired oil film thickness setting value;
A coil heating device for heating the coil to be rewound;
A power regulator for adjusting the power applied to the coil heating device;
An oil film adjusting device for a metal strip, which is provided with an oil film thickness control device for adjusting the power applied to the coil heating device based on the measured oil film thickness and / or temperature. .   The said film heating apparatus arrange | positions a heat generating body along the outer peripheral surface of the coil to rewind, The oil film adjustment apparatus of the metal strip of Claim 3 characterized by the above-mentioned.

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