JPH05126539A - Method for detecting twist in material to be rolled - Google Patents

Abstract

PURPOSE:To provide a method for detecting twists of materials to be rolled by which a rolling mill causing a twist can be promptly discriminated by using such a small-sized detecting device that can be installed between rolling mills, such as block mills. CONSTITUTION:Reference lines E0 and E0 which intersect each other at one point Q on a vertical or horizontal line y-y of a material to be rolled 1 are radially set on both sides of the line y-y at the same angle theta. Then, by installing light sources 2 of parallel rays of light 4 on one sides and a photoreceptors 3 on the other sides, the distances e1 and e2 from light shielding points P1 and P2 on the outer circumferential edge of the material 1 to the reference lines are measured. The measured values are inputted to a computing element and the inclined angle of the cross section and the twisted direction of the material 1 are simultaneously detected based on the relation between the reference lines and cross-sectional shape of the material 1 stored in advance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting twisting of a rolled material when continuously rolling a round steel material, and particularly in a rolling machine exit side in rolling performed by using a caliber roll, a rhombus excluding a perfect circle and an ellipse. The present invention relates to a method for detecting twist of a material to be rolled having a sectional shape such as a shape.

[0002]

2. Description of the Related Art Usually, a round steel material such as a wire rod or a steel bar is manufactured by continuous rolling from a rough material having a rectangular cross section using a caliber roll. This Caliber roll is a roll cylinder in which box-shaped, diamond-shaped, elliptical, etc. cariva (hole type) is engraved, and the final roll is provided with a circular cariba.

FIG. 3 shows an example of a caliber of a rolling mill at the final four stages in rolling such a round steel material and an example of a cross section of a material to be rolled which is rolled by the caliber. In this example the rolling mill is 12
The # 9 rolling mill and the # 11 rolling mill are horizontal rolling mills.
The 10th rolling mill and the # 12 rolling mill, which is the final finishing rolling mill, are vertical rolling mills. Then, the # 1 to # 8 rolling mills successively reduce the surface of the box (box), diamond (diamond), oval (oval), etc., and the # 9 to # 11 rolling mills perform rolling with the oval caliber. 12 Finished rolling mill finishes round steel products.

In rolling such a round steel product, when the adjustment of the caliber or the guide is insufficient, the material to be rolled is often twisted on the exit side of the rolling mill. When twisting occurs in the material to be rolled in this way, it does not bite into the next caliber well,
Not only does it cause defective products, but it also causes misrolls. Therefore, the rolling operation is performed smoothly by detecting the presence or absence of the twist of the material to be rolled on the exit side of the rolling mill and the degree thereof.

For this twist detection, for example, Japanese Patent Laid-Open No. 56-13401
There is a method disclosed by Japanese Patent Publication No. 9. According to this method, twisting is detected by optically detecting a dark line appearing in a non-contact portion of the caliber roll on the peripheral surface of a round steel material that has been water-cooled after rolling. In addition, many optical means for measuring the cross-sectional shape of a round steel material have been proposed, and these means can also be used for detecting twisting.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention JP-A-56-134019
The method according to the gazette detects twisting of the round steel material on the exit side of the final finishing rolling mill.Therefore, in the rolling of ordinary round steel material that performs continuous rolling using many rolling mills with 10 or more stages, which rolling mill It is impossible to determine whether a twist has occurred due to.

This problem can be solved by installing a twist detection device or a device for measuring the cross-sectional shape of the round steel material by the optical means on the exit side of each rolling mill. The device is rather large since it works by rotating optical means around it. Therefore,
It is difficult to install between rolling mills such as a block mill in which many rolling mills are arranged close to each other or a compact mill.

Further, since each of the above devices scans the outer circumference of the round steel material in a spiral shape in the longitudinal direction, there is a problem in that it is difficult to accurately grasp the change state of the twisting. Even if it was discovered, it was not possible to promptly determine the place where the cause was generated due to the aforementioned problems, and the operation stop time was unnecessarily lengthened. Further, since each of the above devices requires a rotary drive device, the structure is complicated and expensive, and maintenance and inspection are troublesome between rolling mills having a bad environment, which is a problem.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a method for detecting the twist of a material to be rolled which can be implemented at a low cost by using a simple and compact device.

[0010]

SUMMARY OF THE INVENTION The present invention is a method for detecting a twist of a rolled material when continuously rolling a round steel material, which is a point on an extension line in the vertical or horizontal direction passing through the axis of the rolled material. The two reference lines intersecting each other are radially set at an angle symmetrical to the extension line so that the vicinity of both outer peripheral ends of the rolled material is desired, and the reference line is parallel to the reference line on one side sandwiching the rolled material and A light source for parallel rays having a width in a plane parallel to the cross section of the material to be rolled and a receiver for the parallel rays are respectively provided on the other side, and the parallel rays are shielded by the outer peripheral edge of the material to be rolled and the reference line. The distance between the rolled material and the cross section of the material to be rolled is calculated based on the relationship between the reference line and the shape of the material to be rolled, which is stored in advance by inputting the measured value into a calculator, It is a solution to a technical problem.

[0011]

Since a part of the parallel light emitted from the light source is shielded by the outer peripheral edge of the rolled material, its light-dark branch point (hereinafter, light-shielding point) is detected by the light receiver. Then, the measured value of the distance between the light-shielding point and the reference line is input to a computer in which the relationship between the reference line and the cross-sectional shape of the material to be rolled is stored in advance.

In the computing machine, both outer peripheral edges of the current cross section to be rolled (parallel to the reference line) (light-shielding points, that is, two bright and dark branch points)
Two straight lines passing through are calculated, and the same cross-sectional shape in which the center point is the same as the stored cross-section of the rolled material inscribed in the straight lines is calculated. This can also be obtained by image processing. The inclination angle of the new sectional shape of the material to be rolled thus obtained is the amount of twist of the material to be rolled under the present circumstances.

If only the amount of twist is to be obtained, it is possible to simply detect by irradiating the entire cross section of the material to be rolled or the vicinity of both side ends with parallel rays of which all optical axes are parallel. In this case, the twist direction of the rolled material cannot be determined. Therefore, in the present invention, the two reference lines are set symmetrically and radially at the same angle. In this way, when the reference lines are inclined with respect to each other and parallel rays parallel to the reference line are irradiated, the distance between the shading point and the reference line is larger (however, the outside of the reference line is positive and the inside is negative). The rolled material is twisted on the side of the intersection of the reference lines (hereinafter simply referred to as the intersection). The reason for this is that the rolled material cross section for round steel is mirror-symmetrical, and the distances between the light shielding points on both sides of the rolled material cross section and the extension lines passing through the axis are equal to each other, but the sine component of the reference line depends on the intersection point. This is because the smaller the distance is, the larger the distance between the light-shielding point and the reference line becomes.

In the present invention, as described above, not only the twist amount of the material to be rolled but also the twist direction can be known.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.
This embodiment is an example in which the material 1 to be rolled having a vertically long oval cross section is measured on the exit side of a vertical roll (for example, # 11 shown in FIG. 3). In the figure, two reference lines E ₀ and E ₀ having one point Q on the long axis extension line y-y passing through the axis 0 of the oval cross section as an intersection point are set at the same angle Q with respect to the extension line y-y. Q
To set radially. In this case, the reference lines E ₀ and E ₀ are set to the angles θ 1 and θ 2 so that the reference lines E ₀ and E ₀ are desired to be near both outer peripheral edges when the rolled material is passing in a normal state as in 1a. It is good to consider so that as much as possible of the material to be rolled rolled by the rolling mill can be measured. Further, if there are many kinds of rolled materials and it is not possible to cope with only a constant angle θ, it is desirable to make θ variable.

Light sources 2 and 2 for irradiating the parallel light rays 4 are provided on the side of the intersection Q, and light receivers 3 and 3 for receiving the parallel light rays 4 are provided on the other side. This may be a light receiver on the side of the intersection Q and a light source of parallel rays on the other side. The parallel rays 4 are parallel to the reference lines E ₀ and E ₀ , respectively, and have a width B in a plane parallel to the cross section of the material to be rolled. The width B is also determined from the size of the material to be rolled by this rolling mill and the predicted twist amount α. There is no problem even if the intersection Q side is a light receiver and the other side is a light source.

A laser light emitting element, a combination of a halogen lamp and a lens, or the like can be used as the light source of such parallel rays, and a CCD element is used as the light receiver. On the other hand, a cross-sectional shape 1a of the material to be rolled after being rolled by this rolling mill is approximated by a spline function or the like and input as a function curve in advance in a computing machine (not shown). Further, the positional relationship Y, θ between the center O of the material 1 to be rolled and the reference lines E ₀ , E ₀ and their intersections Q is also entered. Any positional relationship may be used as long as it can be expressed geometrically.

In this way, the parallel rays from the light sources 2 and 2 are emitted.
When the rolled material 1 is twisted when irradiated with 4 and 4,
Shading point P₁, P₂Moves outward (from the minor axis of the oval
If irradiated, do the reverse). This amount of movement is the reference line E₀, E
₀Distance from₁, E₂Measured as₁, E₂
By inputting the₁, P
₂Passing through the reference line E₀, E₀A straight line parallel to
Branch line E₁, E₂Find a straight line corresponding to and inscribe this
By obtaining the inclination angle of the cross-sectional shape of the rolled material
The twist angle α can be known.

By comparing the distances e ₁ and e ₂ with each other, the twisting direction can be known. For example, in the case of FIG. 1, e ₁ > −
e ₂ and the material 1 to be rolled has an upper side inclined toward e ₁ (left side in the figure). In addition, the above-mentioned shading of the shading point may occur due to the influence of the material to be rolled and the vibration of the rolling mill, but the data such as the average value, the standard deviation of the measurement within a certain fixed time, the comparison of the variance and the reference value, etc. The effect of vibration can be removed by the processing.

FIG. 2 shows the rear stages # 9, # 10, # 11 of the 12-high rolling mill.
FIG. 3 is a plan view of an example in which the twist detection devices 9, 10 and 11 are installed on the rolling mill output side, in which case the cross-sectional shape of the material R to be rolled is an oval as shown in FIG. For the device 10 and the device 10 for the vertical direction. Although not shown in the figure, it is also installed in the required place in the former rolling mill.

Although the above description has been directed to a material to be rolled having an oval cross section, the present invention is applicable to any other material having an outer peripheral shape having a different distance from the center such as diamond. When this invention is applied to wire rod rolling in a 10-high block mill, when a twist detection device is used only on the exit side of the final rolling machine as in the past, it takes about 30 minutes or more to examine the twist occurrence position. Things can be judged immediately.

[0022]

When the method for detecting the twist of the material to be rolled according to the present invention is applied, the apparatus used can be made extremely small, so that it can be installed between block mills and compact mill rolling mills, and all of the Caliber rolls are used. In the rolling of round steel material, it is possible to immediately determine the location where the twist occurs, which greatly contributes to the improvement of the operating rate of the rolling mill and the improvement of the basic unit of energy.

Furthermore, since the apparatus itself used has no moving parts, it is inexpensive and robust, and has the advantage that maintenance and inspection are easy.

[Brief description of drawings]

FIG. 1 is an explanatory diagram when the present invention is applied to a rolled material having an oval cross section.

FIG. 2 is a side view of a case where a twist detection device is installed on the exit side of a post-rolling mill of a 12-high rolling mill.

FIG. 3 is an explanatory diagram of a shape of a caliber and a cross-sectional shape of a material to be rolled in a final four-high rolling mill of a 12-high rolling mill.

[Explanation of symbols]

 1 Cross-section of rolled material 2 Light source of parallel rays 3 Light receiver of parallel rays 4 Parallel rays

Claims (1)

[Claims] 1. A method for detecting a twist of a rolled material when continuously rolling a round steel material, comprising two reference lines intersecting at a point on a vertical or horizontal extension line passing through an axis of the rolled material. Radially set at a symmetric angle to the extension line as desired near the outer peripheral edges of the rolled material, and parallel to the reference line on one side of the reference line sandwiching the rolled material and parallel to the cross section of the rolled material. A light source of parallel rays having a width on a surface, a receiver for parallel rays is provided on the other side, and the distance between the reference line and the point where the parallel rays are blocked by the outer peripheral edge of the material to be rolled is measured. A method for detecting twist of a rolled material, characterized in that the inclination of the rolled material cross section is obtained based on the relationship between the reference line and the cross sectional shape of the rolled material, which is stored in advance by inputting measured values to a computer.