JP2504483B2 - Method and apparatus for measuring crossbunkle of metal strip - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a method and an apparatus for measuring a cross strip of a metal strip, and in particular, a cross strip of a metal strip suitable for measuring a cross bag generated when cold rolling or temper rolling a steel strip or the like. The present invention relates to a measuring method and device.

[Prior art]

When a metal strip such as a steel strip is subjected to cold rolling or temper rolling, a type of shape defect often referred to as a cross bag occurs. The generation pattern of this cross bag is various, and representative ones are shown in FIG.
It shows in (G). Although the principle of generation of the above-mentioned cross-buckle has not been clarified, the metal strip tries to spread in the width direction during rolling, and as a result of this width spread being constrained by the work rolls, the cross-burst is crossed to the metal strip. It is said that tsukuru will occur. Further, this cross bag tends to be generated particularly during dry temper rolling in temper rolling and during high pressure rolling in the final stand or final pass in cold rolling. By the way, a method and an apparatus for quantitatively measuring a cross bag generated on such a metal strip have not been proposed or implemented at all in the past, and an operator visually checks the weight of the cross bag on a production line of the metal strip. The current situation is to evaluate and judge.

[Problems to be Solved by the Invention]

However, when the cross strips of metal strips are visually evaluated and judged as in the prior art, there is a large individual difference and it is difficult to make a correct judgment. Therefore, the result is a sensitive test, and the measurement accuracy is not constant. There is. Also, if the cross bag is missed, it will be shipped as it is and it will be a problem in terms of quality assurance.Thus, even though it imposes a heavy burden on the operator, it is not possible to completely eliminate the miss of the cross bag by visual inspection. It is possible. As described above, the visual inspection of the cross strip of the metal strip is extremely difficult, but the reason is as follows. (I) There are various patterns of occurrence of cross bags, for example, as shown in FIG. 8, and the evaluation varies depending on the individual worker. (Ii) There are various surface roughnesses of metal strips, and it is not possible to quantitatively determine cross bags. That is,
For example, there are bright finishes, dull finishes, etc. for tin originals, etc., and with bright finishes, the originals are close to the mirror surface, and therefore, the presence of cross bags distorts the image,
The cross-bulk becomes prominent, but on the other hand, the surface roughness is large in the dull finish, so the original plate surface is rough, and the image is not distorted even if the cross-bulk is present, so that the cross-bulk tends to appear slight. (Iii) Ear strips, middle stretch, warp, etc. occur on the metal strip, and the cross bag is produced by compounding on the middle stretch among these. Therefore, for the above-mentioned reason, the conventional evaluation and determination of the cross strip of the metal strip has a problem that the realization of the quantitative measurement of the cross bag is hindered. It is possible to use a contact type displacement gauge such as a dial gauge to measure the cross bag,
Usually, there is a problem that the metal strip is deformed due to the pressure with which the displacement gauge is brought into contact, and an accurate measurement value cannot be obtained.

[Object of the invention]

The present invention is made in view of the above conventional problems, without being visually observed, it is possible to quantitatively and accurately measure the cross strip of the metal strip, a method for measuring the cross strip of the metal strip, and The purpose is to provide a device.

[Means for solving problems]

The present invention relates to a method for measuring a cross bag generated when rolling a metal strip, wherein a length l in a rolling direction is measured.
And a sample having a ratio l / W of the length W in the direction at right angles to 0.05 to 0.3 is taken from the metal strip, and the taken sample is placed on the placing surface of the placing table, and the contact type displacement meter The object is achieved by parallelly moving the sample to the mounting surface while contacting the sample surface with a contact pressure of 0.3 N or less, and quantitatively measuring the cross bag from the output signal of the contact displacement meter. It was done. Further, the present invention is, in an apparatus for measuring a cross bag generated when a metal strip is rolled, a rolling direction length l and a ratio l / W of the length L and the orthogonal direction length W, which are sampled from the metal strip, are measured. A contact for detecting the displacement of the sample surface on the mounting surface with a mounting table for mounting a sample of 0.05 to 0.3 on the mounting surface by a contact pressure of 0.3 N or less. Type displacement gauge, means for moving the contact type displacement gauge in parallel with the mounting surface, and means for quantitatively measuring the cross bag by frequency-analyzing the output signal of the contact type displacement gauge. Thus, the above-mentioned object is also achieved. Further, the present invention is, in an apparatus for measuring a cross bag generated when a metal strip is rolled, a rolling direction length l and a ratio l / W of the length L and the orthogonal direction length W, which are sampled from the metal strip, are measured. A contact for detecting the displacement of the sample surface on the mounting surface with a mounting table for mounting a sample of 0.05 to 0.3 on the mounting surface by a contact pressure of 0.3 N or less. A displacement sensor, means for moving the contact displacement sensor in parallel with the mounting surface, and means for displaying the profile of the cross bag from the output signal of the contact displacement sensor. Has been achieved.

[Action]

In order to quantitatively grasp the cross bag generated on the metal strip, the inventors of the present invention have repeatedly examined whether or not it is possible to handle the cross bag as a wave generated on the surface of the metal strip. As a result, the present invention has been achieved, and the cross-battery of the metal strip, which has been conventionally measured visually, can be quantitatively measured for the first time by the present invention. Hereinafter, the principle of the present invention will be described in detail. For example, the metal strips after cold rolling or temper rolling have edge elongation, medium elongation, etc., which are disturbances during measurement, so use the rolled metal strips as they are for cross bag measurement. You cannot do it. In this case, the ear stretch does not pose a problem in measurement, but the middle stretch (also called the belly stretch), which is a non-uniform stretch in the central portion in the width direction of the metal strip, interferes with the cross bag and reduces the measurement accuracy. Become. Therefore, the inventors of the present invention cut out a part of the metal strip to form a sample material for measurement (hereinafter referred to as a sample plate), and specify the dimension of the sample plate to a certain dimension to reduce the influence of medium elongation and the like. I thought it could be alleviated. FIG. 2 is an example of the result of measurement and investigation on the relationship between the dimension and shape of the sample plate and the middle elongation height. The horizontal axis in the figure is the length l (m) in the rolling direction of the sample plate and the length W in the direction perpendicular to this.
The ratio 1 / W with (m) is shown, and the vertical axis shows the medium elongation height. Also, in the figure, the measurement results of three types of sample plates (symbols I1 to I
3) shows the change in the middle elongation height when the width W is fixed and the length 1 is changed, starting from the sample plate having a ratio of 1 / W = 1.0. . In the figure, the ratio of l / W is shown for all three measurement results.
As the value becomes smaller, the middle elongation height also becomes smaller and the ratio l / W
Is 0.3 or less, the sample plate with the worst shape (in the figure, the symbol I1
However, it is clear that medium growth can be ignored. That is,
By setting the ratio l / W ≦ 0.3, it is possible to eliminate the influence of medium elongation on the cross bag. If the length l in the rolling direction is made too small with respect to the length W in the direction perpendicular to the rolling, the cutting force at the time of cutting and sampling the sample plate adversely affects the cross bag. Therefore, the ratio l / W ≧ 0.05.
Is preferred. From the above, by specifying the sample plate in the range of the ratio 1 / W = 0.05 to 0.3, as shown in FIG. 3, the cross bag is a wave on the metal strip 9, that is, the wavelength L
And the mountain height (= wave amplitude A × 2) can be quantified. Next, how to measure the cross bag with a contact displacement meter will be described. When the sample plate is measured using the contact type displacement meter, the pressure applied to the sample plate against the contact type displacement meter, that is, the measuring force F causes the sample plate to deform and an accurate measured value cannot be obtained. I'm going out. Therefore, the inventors investigated the relationship between the peak height H (μm) of the cross bag and the measuring force F (N). The displacement gauge used in the investigation and the measuring force F added to it are as follows. That is, dial gauge (JIS
B7509); measuring force 1.5N, lever type dial gauge (JIS B75
33); Measuring force 0.1 to 0.4N, Lever head type electric micrometer; Measuring force 0.02 to 0.20N, Stylus type roughness meter; Measuring force 0.0
02 to 0.30N was used. Further, the sample plate for which the measurement force F has been investigated is a tin plate having a temper degree of 3 or 4 which has been cold-rolled, continuously annealed and temper-rolled (thickness 0.240 mm, width 860 mm).
The sample was cut out from the sample and used, and the number of measurements was 10 times. Fig. 4 shows the results of the above survey, the horizontal axis of which is the measuring force F.
(N), the left vertical axis is the average value x (μ of the mountain height H (μm)
m) and the right vertical axis is the standard deviation σ (μm) of the mountain height H. From the figure, it can be seen that when the measured value F is 0.3 N or less, the average value and the standard deviation σ are almost constant and there is reproducibility, and particularly when 0.15 N or less, it is even better. On the other hand, the measured value F is 0.
It can be seen that when it exceeds 3N, the average value tends to decrease and the standard deviation σ tends to increase. From these results, it can be said that the measuring force F of 0.3 N or less, preferably 0.15 N or less is suitable for obtaining an accurate measured value. As described above, the present invention eliminates the disturbance due to the middle extension to the cross bag by collecting the sample plate, and specifies the size and shape of the sample plate to quantitatively handle the cross bag as a wave. By enabling the measurement force to be a predetermined value or less, the deformation of the sample plate due to the measurement force is prevented, and accurate measurement by the contact type displacement meter is enabled. Therefore, according to the present invention, the cross bag can be quantitatively and accurately measured without visual inspection. If the profile of the cross bag is displayed from the output signal of the contact displacement meter, the cross bag can be directly grasped as a wave, and the quantitative measurement of the cross bag can be performed with higher accuracy.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of the cross bag measuring apparatus according to the embodiment. Further, FIG. 5 is a perspective view showing a configuration around a scanning table 16 for scanning the mounting table 12 for mounting the sample plate 10 and the contact type displacement meter 14 of the measuring device. In this measuring device, as shown in FIG. 1, a drive carriage 18 for moving and scanning the contact type displacement meter 14, a motor 20 for applying a drive force to the drive carriage 18, and a motor 20 A controller 22 for controlling the drive of the displacement sensor, an amplifier 24 for amplifying the output signal of the displacement gauge 14, a fast Fourier transform (hereinafter referred to as FFT) analysis device 26 for the amplified detection signal, and a detection signal To an XY recorder 28 for recording the profile of the sample plate 10. Regarding the x-axis and the y-axis of the XY recorder 28, the direction parallel to the mounting table 12 is x, and the vertical direction is y. Next, the periphery of the mounting table 12 and the scanning unit 16 will be described with reference to FIG. A base 30 serving as a reference for moving the contact type displacement gauge 14 in parallel is provided above the mounting table 12 and in parallel with the mounting table 12. The rails on this base 30
32 and 32 are provided, and the measurement carriage 34 moves on the rails 32 and 32. This measurement carriage 34 is for supporting the contact type displacement gauge 14 via a connecting member 36, and by the measurement carriage 34 being driven by the drive carriage 18, the contact displacement gauge 14 is The sample plate 10 will be scanned. The contact type displacement gauge 14 is attached to the connecting member 36 so as to be movable in the vertical vertical direction of the mounting table 12 by a height adjusting knob 38. The drive carriage 18 is also mounted on the base 30 and will be described later.
Supporting portions 40, 42 for supporting via 46 etc. are provided, and a screw shaft 44 rotated by the motor 20 is attached between the supporting portions 40, 42. A worm gear, a ball spline or the like is formed on the surface of the screw shaft 44 so that the worm nut or the ball gear formed on the drive carriage 18 meshes with it. Therefore, if the screw shaft 44 is rotated by the rotation of the motor 20, the drive carriage 18 is moved in the screw shaft direction. The drive carriage 18 is integrated with the measurement carriage 34 via a coupling member 45, and has a structure that moves in parallel in the direction of the screw axis 44. In this case, the measurement carriage 34 is constrained by the coupling member 45 with respect to the drive carriage 18 in the direction of the screw shaft 44, but is not constrained in the direction perpendicular to the screw shaft 44 or in the direction perpendicular thereto. Reference numeral 46 in the figure denotes a guide rod provided in parallel with the screw shaft 44 for moving the drive carriage 18 in parallel. A stone surface plate can be used as the stand 12 described above. A stepping motor can be used as the motor 20. Next, the operation of the embodiment will be described. When measuring the cross bag in the sample plate of the metal strip to be measured by the measuring apparatus according to this embodiment, first, the length l (m) in the rolling direction and the length W in the direction perpendicular thereto are measured.
A sample plate 10 having a ratio of 1 / W to (m) of 0.05 ≦ l / W ≦ 0.3 is cut out from the metal strip to be measured and collected. After that, the sample plate 10 is placed on the mounting table 12, and the height is adjusted by the height adjusting knob 38 so that the contact pressure of the contact type displacement gauge 14 contacting the sample plate 10 becomes 0.3 N or less.
Next, when the motor 20 is driven by the controller 22, the drive carriage is driven via the screw shaft 44 and the guide rod 46.
18 moves in the direction of the screw axis 44. Then the measurement cart
34 moves integrally with the drive carriage 18 on the rails 32, 32. At this time, since the displacement meter 14 moves integrally with the measurement carriage 34 via the connecting member 36, the profile of the sample plate 10 can be measured from the output signal of the displacement meter 14. The positional relationship between the drive carriage 18 and the measurement carriage 34 is constant in the direction of the screw shaft 44, but is not constrained in the direction perpendicular to the screw shaft 44, that is, in the direction perpendicular to the base 30 and the vertical direction. The influence of vibration or rattling of the drive system of the drive carriage 18 or the like is not transmitted to the displacement meter 14,
There is no adverse effect on the measurement, and therefore accurate measurement results can be obtained. When the contact type displacement meter 14 is scanned on the sample plate 10 by the motor 20 as described above, a position control command signal is input to the motor 20 from the controller 22. Then, the drive carriage 18 moves in response to the command signal, whereby the contact displacement meter 14 moves on the sample plate 10 in parallel with the mounting surface of the mounting table 12. At this time, since the contact of the displacement meter 14 moves up and down according to the profile of the sample plate 10, the displacement meter 14 outputs a displacement signal according to the profile. The output displacement signal is amplified as an electric signal via the amplifier 24 and then input to the FFT analysis device 26. This F
In the FT analysis device 26, the displacement signal is subjected to Fourier analysis, the composite wave is decomposed, and the amplitude and frequency of each wave are calculated.
Further, the position control command signal from the controller 22 is also
The wavelength L is input to the FFT analyzer 26, and the wavelength L is calculated based on this command signal when the cross bag as shown in FIG. 3 is considered as a wave. As described above, the cross-packet can be quantitatively evaluated by catching the cross-packet as a wave, that is, the evaluation of the cross-packet, which has been conventionally performed by visual observation, that is, by capturing the cross-packet as parameters of the amplitude H and the wavelength L. is there. Since the position control command signal from the controller 22 and the output signal from the contact type displacement meter 14 are input to the XY recorder 28, the profile of the cross bag is recorded. With this, the cross bag can be directly grasped as a wave. FIG. 6 shows an example of the profile recorded on the XY recorder, which is measured as described above. In this case, the sample plate was cut from the center of a tin plate (T4-CA) with a thickness of 0.240 mm and a width of 870 mm, and the dimensions of the sample plate were 100 mm in the length 1 in the rolling direction and W in the direction perpendicular to it. Is 400 mm.
Then, this sample plate was moved at a speed of 10 mm / sec using a contact displacement meter.
It was measured at. Further, the result of frequency analysis of the output signal from the contact type displacement meter under the above conditions by the FFT analyzer is shown in FIG. From the figure, it can be seen that the cross bag has a wavelength of 80 mm and an amplitude of 31 μm. Further, the steepness λ (%) of the cross bag can be calculated by using the measurement result as in the following expression (1), and the steepness λ can be easily displayed. λ = (2A / N) × 100 = (2 × 31 × 10 ⁻³ / 80) × 100 ≈0.08 (%) (1) In the frequency analysis result of FIG. 7, the wavelength L =
A frequency component of 400 mm was also detected, but this is not due to the cross bag because it is the same as the length W in the direction perpendicular to the rolling of the sample plate, but it is not due to other factors such as medium elongation or warpage of the sample plate. it is conceivable that. In addition, in the above-mentioned embodiment, the case where the present invention is applied to the measuring device of the cross bag having the configuration as shown in FIG. 1 and FIG. 5 has been described. It is not limited to those shown in the figure. That is, in the above-mentioned embodiment, the position control command signal of the controller is used to grasp the measurement position of the contact displacement meter, but the position sensor is provided in the drive carriage 18 or the measurement carriage 34, and the detection signal is used. The measurement position may be grasped by using the rotation speed meter or the rotation speed meter may be provided on the motor 20 or the screw shaft 44 and the measurement position may be grasped by using the output signal of the rotation speed meter. Further, the means for displaying the profile of the cross bag is not limited to the XY recorder 28 as in the above-mentioned embodiment, but may be displayed by other display means, for example, any device such as an oscilloscope.

【The invention's effect】

As described above, according to the present invention, it is possible to quantitatively and accurately measure a cross strip of metal strips without relying on visual judgment. Therefore, it is possible to significantly reduce the burden on the operator, exert a great power for quality assurance, and improve the reliability of the product.

[Brief description of drawings]

FIG. 1 is a block diagram including a partial cross-sectional view showing a schematic overall configuration of a cross bag measuring device according to an embodiment of the present invention, and FIG. 2 is a diagram for explaining the principle of the present invention. A diagram showing an example of the relationship between the ratio 1 / W of the length l in the rolling direction and the length W in the perpendicular direction and the medium elongation height, and FIG. 3 is the wavelength when the cross bag on the metal strip is also made into a wave. FIG. 4 is a perspective view showing L and the mountain height H, FIG. 4 is a diagram showing an example of the relationship between the average value of the mountain height and the standard deviation thereof with respect to the measuring force, and FIG. FIG. 6 is a perspective view showing the periphery of the scanning unit in detail, FIG. 6 is a diagram showing an example of an output signal of the contact displacement meter for explaining the operation of the embodiment, and FIG. 7 is also the output signal. Fig. 8 is a diagram showing an example of the result of FFT frequency analysis of Fig. 8, and Fig. 8 is each example of a cross bag on a metal strip. FIG. 10 …… Sample plate, 12 …… Mounting table, 14 …… Contact displacement meter, 16
...... Scanning section, 18 ...... Drive carriage, 20 ...... Motor, 22 ...... Controller, 26 ...... FFT analysis device, 28 ...... XY recorder, 30 ...... Base, 34 ...... Measurement carriage, 36 ...... Connecting member,
38 …… Height adjustment knob, 44 …… Screw axis.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Laid-Open No. 62-54116 (JP, A) Actually developed 59-10009 (JP, U)

Claims (3)

(57) [Claims] 1. A method for measuring a cross bag generated when rolling a metal strip, wherein a rolling direction length l and a ratio l / W of the length l and the length W in a direction perpendicular to each other are 0.0.
A sample of 5 to 0.3 is sampled from the metal strip, the sample is mounted on the mounting surface of the mounting table, and the contact displacement meter is brought into contact with the sample surface with a contact pressure of 0.3 N or less. However, the method for measuring the cross bag of the metal strip is characterized in that the cross bag is quantitatively measured from the output signal of the contact type displacement meter while being moved in parallel to the mounting surface. 2. A device for measuring a cross bag generated when a metal strip is rolled, wherein a length l in the rolling direction and a ratio l / W of the length l and the length W in the direction perpendicular to the strip l taken from the metal strip are 0.05. A contact table for detecting the displacement of the sample surface on the mounting surface by contacting it with a contact pressure of 0.3 N or less. A displacement gauge; means for moving the contact displacement gauge in parallel with the mounting surface; and means for quantitatively measuring the cross bag by frequency-analyzing the output signal of the contact displacement gauge. A measuring device for a metal strip cross bag. 3. A device for measuring a cross bag generated when a metal strip is rolled, wherein a length 1 in the rolling direction and a ratio l / W of the length L and the length W in the orthogonal direction, which are sampled from the metal strip, are 0.05. A contact table for detecting the displacement of the sample surface on the mounting surface by contacting it with a contact pressure of 0.3 N or less. A displacement gauge, means for moving the contact displacement gauge in parallel with the mounting surface, and means for displaying the profile of the cross bag from the output signal of the contact displacement gauge. Measuring device for cross strips of metal strips.