JPS5977343A - Method for measuring amount of application of anti-corrosive oil - Google Patents

Abstract

PURPOSE:To make it possible to perform online measurement and continuous measurement along the entire width and the entire length, by projecting laser light on the anti- corrosive oil applied surface of a steel plate or steel strip. CONSTITUTION:At the output side of an oil applying device 3, a light projector 4 is provided so that it is directed toward the passing surface of a cold rolled steel strip 1. A light receiving device 5 is provided on the path of the reflected light. Based on the intensity and distribution of the reflected laser light, which is received by the light receiving device 5, the amount of oil application at the part where the laser light is projected is instantly displayed on a display part 7. When the light projector 4 and the light receiving device 5 are fixed, the amount of oil application is continuously and intermittently measured in the longitudinal direction with the advance of the steel strip 1, and that is all. When the light projector 4 and the light receiving device 5 are allowed to move in the width direction of the material, the width direction of the material can be measured. When the measurement is combined with the measurement in the longitudinal direction, the entire material can be uniformly measured. Instead of moving the light projector 4 and the light receiving device 5 in the width direction of the material, a plurality of the devices can be arranged in the same direction in parallel.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring the amount of rust preventive oil coated on the surface of a steel plate or copper strip, which can accurately measure the amount of rust preventive oil applied to the surface of a steel plate or copper strip.

After rolling, the surface of the steel plate or copper strip is coated with anti-corrosion oil to prevent rust from forming. If the amount of this anti-rust oil is too small, the rust-preventing effect will be insufficient, but if it is too large, it will cause economic disadvantage or cause the cleaning solution to be contaminated more than necessary when removing it, so strict control of the amount applied is required. I can see it.

Conventionally, this coating amount has been measured by a sample loading method, a sample cutting method, etc. In the former method, as shown in Figure 1(a), a flat plate (8) is placed on the material (1) to be measured on the entrance side of the oil applicator (3), and after passing through the oil applicator (3), the flat plate (8) is placed on top of the material (1) to be measured. The weight of the material (8) is measured and compared with the weight before passing through the oil applicator (3), and the latter is the weight of the material (1) after passing through the oil applicator (3) as shown in Figure 1 (b). The method is to directly cut out a sample (9 mm) and measure its weight, and then compare it with the weight measured after degreasing to determine the amount of oil applied.

Although these methods have no problems with accuracy, they require offline production such as weight measurement, sample cutting, and degreasing, so they have the drawback of requiring a large amount of labor and time for measurement. It is simply impossible to measure the entire length of the material or the gold mine, and as a result, there is also the drawback that the amount of application cannot be accurately determined.

The present invention provides a rust-preventing oil-coated surface that eliminates these drawbacks.

It provides a measurement method. That is, according to the method of the present invention, it is possible to accurately and easily measure the amount of rust preventive oil applied online over the entire length of the material, the gold mine, or both, and furthermore, it is possible to selectively measure the required areas and the amount of rust preventive oil applied can be measured in an extremely short time. It can also be measured with . This will be explained in detail below.

BACKGROUND ART Recently, laser light has been used for various measurements and weighing by taking advantage of its high coherence, and in the production of steel plates and copper strips, it is used for flaw detection in materials after rolling. The inventor of the present invention observed a phenomenon in which the reflected light changes depending on the area on which the laser beam is projected, even though there are no defects on the steel strip during detection of cold-rolled steel strips using this laser beam. Therefore, the inventor of the present invention investigated and researched the causes of variation in this reflected light, and found that the rust preventive oil applied to the surface of the cold-rolled steel strip surfaced, and the relationship between the amount of this rust preventive oil applied and the laser reflected light was found. As a result of further investigation and research, a very clear relationship was established between the amount of anti-rust oil applied and the laser reflected light, and it became clear that the amount of anti-rust oil applied could be accurately measured from the laser reflected light.

Moreover, this laser beam does not allow for accurate measurements, and the amount of oil applied to the area where the laser beam is projected can be immediately determined, making measurement extremely easy and moving the area where the laser beam is projected. Therefore, it becomes possible to perform online measurements, which were impossible to perform using conventional methods, and to perform continuous measurements over the entire length of the material.

The present invention was developed based on the above knowledge, and involves projecting a laser beam onto the rust-preventing oil-coated surface of a steel plate or copper strip, and measuring the amount of the rust-preventing oil applied based on the intensity and/or distribution of the reflected light. The gist of this paper is how to measure the amount of anti-rust oil applied.

Hereinafter, the method of the present invention will be explained in more detail with reference to the drawings.

Figure 2 shows a laser beam (wavelength Q,
5323Pln1 intensity 1mW)'e distance 200ml+
The reflected light when projected from the narrow tube 2 is displayed on the three-dimensional coordinates of the received light intensity, horizontal receiving angle, and vertical receiving angle.
Figure (a) shows that when the amount of oil applied is 1.2 g/m', the second
Figure ('b) shows the case where the amount of oil applied is small, 0.3 g/m''.There are no flaws in the copper strip itself, so the difference in the characteristics of reflected light is due to the amount of oil applied to the surface of the copper strip. It is concluded that this is due to the difference in the amount of anti-rust oil applied.Comparing the two figures, it is found that in Fig. 2 (a) where the amount of oil applied is large, the specularly reflected light is extremely V-strong, while the reflection from the surroundings is It can be seen that the light decreases greatly, and in the case of FIG. 2 (to) where the amount of oil applied is small, the specularly reflected light decreases and the surrounding reflected light becomes stronger.

Therefore, the intensity of the laser reflected light is measured, and this is
The amount of oil applied can be determined by comparing the relationship between the reflected light intensity and the amount of oil applied, which are determined in advance for each type of material and type of rust preventive oil9, and the amount of oil applied can also be determined from its distribution, intensity, and distribution. .

FIG. 3 shows the relationship between the amount of oil applied and the intensity of laser reflected light when a rust preventive oil of 90% mineral oil + 5% oxidized hydrogen ester compound + 5% basic Ba nulphonate is applied to a cold rolled steel sheet.

Fig. 4 shows examples of equipment suitable for carrying out the entire method of the present invention, in which (1) is a cold-rolled steel strip, (2) is a take-up reel, (3) is an oil application device, and (4) is a winding reel. ) is a laser projector, (5)
indicates a light receiver, (6) a data processing section, and (7) a display section. Here, examples of the laser projector (4) include a 't'l He-Ne laser projector, an argon laser projector, etc. The photoreceiver (5) may be a photomultiplier, a photodiode, etc.

In the installation shown in Fig. 4(a), a floodlight (4) is installed on the exit side of the oil applicator (3) to face the passing surface of the cold-rolled steel strip (1), and the reflected light is placed on the path of the reflected light. A light receiver (5) is installed, and the amount of oil applied to the laser beam projection area is immediately displayed on the display section (7) from the intensity and distribution of the laser reflected light received by the light receiver (5). When the emitter (4) and receiver (5) are fixed, the amount of oil applied is only measured continuously and intermittently in the longitudinal direction of the material as the cold rolled steel strip (1) advances. If the emitter (4) and the receiver (5) are made movable in the width direction of the material, it is possible to measure the width of the material, and when combined with the measurement in the longitudinal direction described above, it is possible to measure the entire material evenly. This makes it possible to measure without any problems. In addition, instead of moving the light emitter (4) and the light receiver (5) in the width direction of the material, it is also possible to arrange a plurality of light emitters (4) and light receivers (5) in parallel in the same direction.

In addition, in the apparatus shown in FIG. 4 (to), two sets of light projector (4) and light receiver (5) are installed on the same line in the longitudinal direction of the material with the oil application device (3) in between, and the oil application device (3) The floodlight on the entrance side (4
) and receiver (5) to measure the surface properties (roughness, presence or absence of flaws, etc.) of the cold rolled steel strip (1) before oil application, and The effect of the above-mentioned surface properties is subtracted from the amount of applied oil measured by the light receiver (5) to more accurately measure the amount of applied oil.

In this device as well, it is possible to arrange a plurality of light emitters (4) and light receivers (5) in parallel by moving them in the monthly profit direction.

The laser beam used in the method of the present invention has a wavelength of 0.5-0.7 μm and an intensity of 1 mW-1.5 mW.
However, there is no particular specification. The reason is ■ V-
If the surface is mirror-finished and has a thickness comparable to the laser wavelength (1 μm or less), there will be effects such as interference due to the coherent nature of the laser.

■ The correlation phenomenon between the amount of oil and the intensity of reflected light is due to the fact that when the surface unevenness becomes smooth with oil, light scattering decreases and the intensity of specularly reflected light becomes stronger.

■ Therefore, it is considered that it does not depend on the wavelength, output, etc. of the laser, as it uses only one of the characteristics of laser light, which is the ability to easily obtain a thin parallel beam (approximately 1 hour long).

As is clear from the above description, the present invention can extremely easily measure the amount of rust preventive oil applied online, which can only be done offline and is very time-consuming.
This greatly reduces the labor and time required for measurement, and also measures the distribution of the amount of oil applied in the longitudinal and width directions of the material, as well as the entire material, making it possible to grasp the oil application state extremely accurately. .

[Brief explanation of drawings]

Figures 1 (a) and (b) C are schematic diagrams showing the conventional method of measuring the amount of oil applied, Figure 2 (a) and (t)) 44 Three-dimensional diagram showing the difference in laser reflected light due to the difference in the amount of oil applied Graph, Part 3 (2)
A graph showing the relationship between the amount of oil applied and the laser reflected light intensity,
Figures 4(a) and 4(cb) are schematic diagrams showing an apparatus suitable for carrying out the method of the invention. In the figure, l: cold rolled steel strip (material to be measured), 2: winding reel, 8: oil application device, 4: laser projector, 5: light receiver, 6
: Data processing unit, 7: Display unit Fig. 1 ← 239- Fig. 2 ((1) H-ANGLE (deg) ) - 1-ANGLE (deg) Fig. 3 Small amount (ml/, ,,Figure 4 (G)

Claims (1)

[Claims] (1) Amount of rust preventive oil applied, characterized in that a laser beam is projected onto the rust preventive oil coated surface of a steel plate or steel strip, and the amount of the rust preventive oil applied is measured based on the intensity and distribution of the reflected light. Measuring method.