JP2001179316A - Control method for dimension and shape of section steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method for dimension and shape of the section steel which exponentially upgrades web center biased degree precision in H- section steel. SOLUTION: When the section steel is reverse rolled with the universal mill, products configuration abnormal occurrence factor model has to be memorized and simultaneously dimension of the section steel in the longitudinal direction is divided into plurality, keeping a predetermined distance and the divided position has to be memorized. The section steel after the rolling pass with the universal mill is tracked and simultaneously sectional topographic profile is measured along the longitudinal direction and the sectional topographic profile in the divisional position and the factor model are checked up to determine factors to be revised and its revision volume through the total length per every predetermined space in the longitudinal direction. Based on the determination, the roll position per every space has to be adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a U-E (Universal Mill-Edger Mill), U-E-
When manufacturing in a U (universal mill-edge mill-universal mill) arrangement, the present invention relates to a method of controlling the size and shape of a shaped steel based on sensor information.

[0002]

2. Description of the Related Art Shaped steel is generally formed while undergoing three-dimensional deformation, and its clarification of its theory is still inadequate. Therefore, the dimensional accuracy is inferior to other types of steel products such as plates and bars. I have. This is not only due to insufficient theoretical elucidation, but also, for example, in the case of H-section steel, it is necessary to measure 12 dimensions, many dimensions are measured, many measuring instruments are required, and the investment amount is large and the equipment is large. This is also due to the fact that it is difficult to convert. Also, in the use and actual use of steel materials, since there is relatively little need for improving dimensional accuracy, a driving force for improving the accuracy was not applied.

[0003] However, recently, there has been a tendency for high dimensional accuracy to be required, including H-section steel having a constant external law.
In addition, the JIS accuracy is being reviewed, and under such a background, various improvements have been proposed for dimensional accuracy, particularly for the center deviation of the web, which is difficult to control. For example, Japanese Patent Application Laid-Open No. 53-48067 discloses a technique for adjusting the level on the mill entrance side to control the pass line position. Also, Japanese Unexamined Patent Publication No. Sho 59-1661
No. 2 proposes to detect the deviation of the web of the rolled material (H-section steel) and change the mill bite angle. Further, Japanese Patent Application Laid-Open No. 2-104413 discloses a technique for detecting a center deviation and changing a pass line of an edger mill. More recently, Japanese Unexamined Patent Publication No. 5-177226 discloses an apparatus for recognizing the shape of a rolled material on the exit side of a universal mill when rolling in a U-E or U-EU arrangement. It has been proposed to detect a pass line from, and change the pass line level or change the tilting (tilt) level.

[0004]

In order to improve the dimensional accuracy, any of the conventional proposals described above requires the level (web guide) on the mill entrance side, the bite angle, the pass line of the edger mill, and the like.
The purpose is to control the pass line of the universal mill to improve the center deviation of the web. However, while saying that the rolled material was recognized by the dimension / shape measuring device,
Or, control is merely performed by detecting the size of 2.

[0005] The above-mentioned center deviation of the web is a result of complicated intertwining of various conditions, and in the prior art, the amount of information to control is small, and the accuracy of center deviation is appropriately improved. Is hard to say. The present invention has been made in order to solve such inconveniences, and a technique for obtaining a cause of a size / shape abnormality including a center deviation from a wide range of information and fundamentally correcting the size / shape abnormality has been developed. The purpose is to provide.

[0006]

Means for Solving the Problems In order to achieve the above object, a method for controlling the size and shape of a shaped steel according to the present invention comprises: At the same time, the longitudinal dimension of the section steel is divided into a plurality of sections at predetermined intervals and the division positions are stored, and the section steel after the universal mill rolling pass is tracked, and the sectional profile of the section steel in the longitudinal direction is tracked. Are measured along, and the cross-sectional profile at the division position and the factor model are compared with each other to determine a factor to be corrected and an amount of correction at predetermined intervals in the longitudinal direction of the section steel and the amount of correction over the entire length. The roll position is adjusted at each interval based on the roll position.

According to a second aspect of the present invention, in the method for controlling the size and shape of a shaped steel according to the first aspect, when it is determined that a plurality of factor models overlap, a priority order is assigned to the factor models and the correction amount of each factor is assigned to the factor model. It is characterized by multiplying by a correction coefficient. In the present invention, adjusting the roll position includes adjusting the relative relationship between the level on the mill entry side and the roll.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In this embodiment,
A method for controlling the size and shape of the H-section steel will be described as an example. H-beams are manufactured by three-dimensional deformation, and it is very difficult to control the center deviation of the web. The center deviation of the web is influenced by the flange thickness, the web thickness, and the flange width determined by the roll gap, and is determined as an overall result of these. These are, for example, the Iron and Steel Institute lecture (72
-12, S1239) and the like, attempts have been made to elucidate the theory, but due to equipment limitations, the dimensional accuracy has not actually been improved at present.

The inventor pays attention to the shape of the H-section steel after rolling,
From the relationship between the product shape and the roll position when abnormal dimensions and shapes occur, we focused on the fact that a flange thickness difference occurs in the four flanges of the H-section steel. Then, in order to investigate the relationship between the roll position and the product size / shape, the normal material was rolled at various roll positions. The shape at that time is shown in FIGS. For example, in FIG. 1, vertical rolls (V rolls) 2a,
2b is in a normal position, and horizontal rolls (H rolls) 1a,
In 1b, the upper horizontal roll 1a has a misalignment 11 to the right with respect to the lower horizontal roll 1b. At this time, the H-section steel 3 has a normal web 4, but the flange 5a,
5b, 5c and 5d have unequal leg lengths and thicknesses in the vertical and horizontal directions. In FIG. 1, it is as follows.

Upper left flange 5a: thicker, longer leg. Flange 5b on the lower left side: The thickness is thin and the leg length is short. Upper right flange 5c: thinner, shorter leg length. Flange 5d on the lower right side: thick, long legs. As shown in FIGS. 1 to 4, equipment abnormality (roll position abnormality)
It can be seen that when the steel is rolled in the state, the H-shaped steel undergoes a characteristic characteristic dimensional change, as shown in the following (a) to (d). Therefore, it has been found that if the size and shape of the H-section steel can be properly recognized, the cause of the abnormal product shape can be determined. (A) When the center roll 11 is given to the left and right sides of the horizontal roll (Fig. 1) Flange spacing: Same left and right, Flange leg length: Left and right unequal, upper and lower unequal Flange thickness: Left and right unequal, upper and lower unequal (b) Guide roll With a height difference of 12 from the horizontal roll level
When raised (Figure 2) Flange spacing: Same left and right, Flange leg length: Same left and right, top and bottom unequal Flange thickness: Same left and right, same top and bottom (c) When vertical roll and horizontal roll are given a height shift 13 (Figure 3) ) Flange spacing: Left and right unequal, Flange leg length: Same left and right, upper and lower unequal Flange thickness: Same left and right, upper and lower unequal (d) Difference in reduction of vertical rolls 2a and 2b
(Fig. 4) Flange spacing: left and right unequal, flange leg length: left and right unequal, upper and lower same Flange thickness: left and right unequal, upper and lower unequal The present invention has been completed based on the above findings, It is modeled as a shape abnormality occurrence factor, and the longitudinal dimension of the shaped steel is divided into a plurality of pieces at predetermined intervals to grasp the dividing position, and the shaped steel after the universal mill rolling pass is tracked and the shaped steel is tracked. The cross-sectional profile is measured along the longitudinal direction, and the cross-sectional profile at the division position and the factor model are collated with each other, and the factors to be corrected at predetermined intervals in the longitudinal direction of the section steel and the amount of correction are determined over the entire length. Based on the determination, the horizontal / vertical roll reduction position, horizontal roll axial direction position, roll guide position, etc. of the universal mill are hydraulically reduced at each of the intervals. Adjust at high speed using a moving device or the like.

FIGS. 5 to 8 and Table 1 show examples of the factor model. Here, four typical phenomena were caught, the relationship between the phenomena and the roll position was investigated, and a product shape abnormality occurrence factor model was created. The present invention provides a profile meter capable of previously dividing a longitudinal dimension of an H-beam into a plurality of portions at predetermined intervals and grasping a dividing position, tracking the H-beam after a universal mill rolling pass, and recognizing the size and shape. The cross-sectional profile of the H-section steel is measured along the longitudinal direction, and the average value of the measured data up to the split position of the cross-sectional profile at the split position of the material obtained by tracking is stored in the profile of the factor model stored in advance. The similarity is checked, and a correction means is selected for each division position over the entire length of the material.

[0012]

[Table 1]

In Table 1, the H roll indicates a horizontal roll of the universal mill, and the V roll indicates a vertical roll. Factors that cause abnormalities in the product shape include flange thickness, flange tip thickness, flange thickness distribution, leg length (vertical difference x
It was found that the web thickness and the web thickness distribution all contributed differently, and it was found that the center deviation was due to the accumulated results of various causes.

On the other hand, when the relationship between the roll position and the product size / shape is quantitatively examined, as shown in Table 1, the difference in flange thickness is determined by the variables (Y ₁ , Y ₂ , X, △) of each roll position relationship.
Hw and θ) (see FIGS. 5 to 8). 5 to 8, Y ₁ : misalignment between H roll and V roll Y ₂ : height difference between left and right V rolls X: axial displacement between upper and lower H rolls ΔHw: width difference between upper and lower H rolls From the simple model, it is possible to determine the product abnormality occurrence factor and the required correction amount.

Further, in order to accurately track the distance in the longitudinal direction of the material, in addition to the tracking by the main machine PLG (pulse generator) during the period from the biting of the material to the removal of the tail, a HMD such as an HMD installed before and after the universal mill is installed. It is preferable to use a sensor having a function of correcting the advance rate during rolling by a sensor. As described above, the factors that change the size and shape may overlap. In this case,
In order to control the shape efficiently and appropriately, considering the degree of influence of those overlapping factors, ease of adjustment and its effect,
It is preferable to select a priority order corresponding to each phenomenon and adjust the correction amount by multiplying the correction amount by a correction coefficient. From the above, as the priority order of the factors of the web center deviation, the V roll lateral pressure difference (FIG. 4), the H roll vertical axis direction deviation (FIG. 7), the HV roll center deviation (FIG. 5), the V roll left and right The height difference (FIG. 6) was set as a major factor of the occurrence of the web center deviation, and the order was prioritized. Although the degree of influence differs depending on the allowable value of the accuracy of the existing equipment, this is one of the leading evaluation methods and can be sufficiently checked by the size / shape recognition device.

As the correction coefficient, since the rolling durability differs depending on the size of the H-section steel and the type of the H-section steel (narrow width system, equal width system), the difference in the flange thickness corresponding to the above-mentioned priority order is respectively determined. , Kv, K ₃ , K ₁ , and K ₂ . The HV roll center misalignment is equivalent to the case where the entrance guide shown in FIG. 2 is different from the roll level. Furthermore,
When there is a V roll lateral pressure difference in FIG. 4, Kv is set to 1.0 in order to deal with the flange thickness at a ratio of 1: 1. If multiple factors are combined,
The differences in points and their deviations, the characteristics of the four flange thicknesses, and the differences in leg length and flange thickness / flange width are compared. And
In order to correct them, correct the V roll left / right pressure difference, H roll vertical axis direction deviation correction, HV roll center deviation correction, V roll left / right height difference correction, guide level correction in the next pass or next pass. Operate an actuator or the like to set the position.

At this time, the amount to be adjusted by each actuator is equal to the difference between the thicknesses obtained by the flange thickness difference formula shown in Table 1.
This is performed by values multiplied by correction coefficients given by K _{1 to} K ₃ respectively. Since this is repeated for each pass, the deviation converges to zero. According to the operation results of the actual machine, K ₃ = 0.7 to 1.0,
K ₁ = 0.5-0.9 and K = 0.5-0.7 were preferred.

The center deviation of the HV roll and the guide level
The guide pressure receiving load can be determined by other than the profile meter
Can be measured, so either judgment can be made.
The roll level or the guide level is adjusted based on this. Change
Regarding the adjustment of the V-roll height difference, refer to Japanese Patent Application No. 5-7.
The syllabary can be performed by the method shown in the 4178 application. Also,
If there is a difference in V-roll rolling reduction,
Since there is a weight difference, the accuracy level can be determined when judging this information together.
Is improved. Measurement after the universal mill rolling pass
Perform on the front of the universal mill and the back of the universal mill.
Therefore, universal mill tandem rolling (U₁-EU
_Two)₁Mill front or U _TwoMill back and both
To do it. In UE rolling, the front of the universal mill or E
Perform on the back side and both. Also, finish universal mill
Then, of course, the back side. In the case of tandem arrangement
Dimensional changes are seen on the mill entrance and exit sides, making it more effective
You.

[0019]

As is clear from the above description, according to the present invention, it is possible to dramatically improve the accuracy of the center deviation of the H-section steel web, which has been the most difficult and most problematic in the past. It has the effect of being able to.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a relationship between a roll position and a product size / shape.

FIG. 2 is a schematic diagram showing a relationship between a roll position and a product size / shape.

FIG. 3 is a schematic diagram showing a relationship between a roll position and a product size / shape.

FIG. 4 is a schematic diagram showing a relationship between a roll position and a product size / shape.

FIG. 5 is a schematic diagram showing a product shape abnormality occurrence factor model.

FIG. 6 is a schematic diagram showing a product shape abnormality occurrence factor model.

FIG. 7 is a schematic diagram showing a product shape abnormality occurrence factor model.

FIG. 8 is a schematic diagram showing a product shape abnormality occurrence factor model.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... H roll 2 ... V roll 3 ... H-section steel 4 ... Web 5 ... Flange 11 ... Center misalignment 12 ... Height difference 13 ... Height misalignment

Claims (2)

[Claims] When a shape steel is reverse-rolled by a universal mill, a product shape abnormality occurrence factor model is stored, and a longitudinal dimension of the shape steel is divided into a plurality at predetermined intervals, and the division positions are stored. In addition, while tracking the shaped steel after the universal mill rolling pass, measure the cross-sectional profile of the shaped steel along the longitudinal direction, collate the cross-sectional profile at the split position with the factor model, A method for controlling the size and shape of a shaped steel, wherein a factor to be corrected and a correction amount at predetermined intervals in the longitudinal direction are determined over the entire length, and a roll position is adjusted at each interval based on the determination. 2. The dimension of a section steel according to claim 1, wherein when it is determined that a plurality of factor models overlap, a priority order is assigned to the factor models, and the correction amount of each factor is multiplied by a correction coefficient. -Shape control method.