JP3658082B2 - Shape steel rolling equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shape steel rolling apparatus , and more particularly to a shape steel rolling apparatus capable of rolling a shape steel, particularly an H-shaped steel having a flange, with high dimensional accuracy.
[0002]
[Prior art]
In general, large H-section steels are made from raw material such as continuously cast beam blanks, blooms and slabs, which are roughly rolled by a breakdown mill, followed by intermediate rolling or finish rolling by a universal mill. Manufactured.
The mills for H-section steel generally have a breakdown mill (having horizontal rolls with a pair of upper and lower grooves) and an intermediate universal mill (upper, lower, left and right facing horizontal rolls and saddle rolls). There are four types: edger mill (having horizontal rolls with grooves that form upper and lower pairs), and finishing universal mill (having horizontal rolls facing the upper, lower, left, and right, and right rolls) Then, rolling is performed in a plurality of reverse passes by a breakdown mill, a plurality of reverse passes by an intermediate universal mill and an edger mill, and a single pass by a finishing universal mill to produce a predetermined shape steel.
[0003]
By the way, the rolling material passing through the universal rolling mill is simultaneously rolled from the upper, lower horizontal rolls and the left and starboard rolls.
At this time, due to the general characteristics of universal rolling, the rolled material is first rolled by the left and right saddle rolls and the upper and lower horizontal roll sides after the flanges are engaged with the left and right saddle rolls. The web then bites into the upper and lower horizontal rolls. Therefore, for example, when the web center and the mill center are rolled in a misaligned state, the flange is constrained before the web, so the web moves according to the amount of misalignment between the centers, and a web bias occurs. To do. Here, in the case of a universal rolling mill, the mill center indicates the center in the barrel length direction of the left and right saddle rolls. The web center is a center in the web thickness direction.
Further, when the rolled material is warped or bites obliquely, the positional deviation between the web center and the mill center is further increased, leading to an increase in web deviation at the front end portion and the rear end portion of the rolled material.
[0004]
This web deviation currently accounts for the majority of the shape defects of H-section steel, and conventionally, the following two types are known as typical countermeasures for web deviation.
The first conventional means, for example, adjusts the height of a roller table for feeding a rolling material to a universal rolling mill, such as “pass line adjusting device in universal rolling mill” of Japanese Patent Publication No. 60-40931, The second conventional means is the same as the horizontal roll and the vertical roll of a universal rolling mill, such as “H-section steel rolling method” of Japanese Patent Application Laid-Open No. 59-193701. The mill center and the web center are matched by adjusting the thickness.
[0005]
[Problems to be solved by the invention]
As described above, both conventional technologies are intended to prevent the H-section steel from being biased by matching the mill center and the web center. There was a problem that it could not be corrected.
Also, the set value when matching the mill center with the web center is fixed to any specific value until one rolling pass is completed, so it corresponds to the fluctuation of the web deviation over the entire length of the H-section steel. There was a problem that it was not possible.
Therefore, in the H-section steel, there is a problem that the effect of countermeasures against web deviation is low, particularly at the front end portion and the rear end portion of the rolled material where web deviation is large.
The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a shaped steel rolling device that not only prevents web bias but also can correct web bias according to fluctuations in web bias over the entire length of the rolled material during rolling. And
[0006]
[Means for Solving the Problems]
The shape steel rolling apparatus according to claim 1, which meets the above object, is a form in which a rolled material of a shape steel having a flange is supplied and rolled into a universal mill in which upper, lower horizontal rolls, left and starboard rolls are incorporated. In the steel rolling apparatus, a web bias measuring unit disposed in the vicinity of the universal mill for measuring the web bias of the rolled material, and calculating a web bias amount based on a measurement result from the web bias measuring unit. An arithmetic unit that calculates the upper and lower offset amounts of the upper and lower horizontal rolls based on the amount of web deviation, a horizontal roll height adjusting unit that raises and lowers the upper and lower horizontal rolls, and the arithmetic unit. Based on the calculated offset amount, during the rolling or non-rolling, by the horizontal roll height adjusting means, while maintaining a constant gap between the upper and lower horizontal rolls, Furthermore, on the lower horizontal roll from Mirusenta, and a control unit for offset below.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. Here, an example of correcting (eliminating) web deviation using a universal rolling mill for intermediate rolling that rolls H-section steel will be described.
As shown in FIG. 1, a shape steel rolling apparatus 10 according to an embodiment of the present invention includes a rolled material 11, which is an H-shaped steel having a flange 11 a, upper and lower horizontal rolls 12 and 13, and left and starboard. It is a rolling device that feeds and rolls into a universal mill 16 in which rolls 14 and 15 are incorporated.
This section rolling device 10 is disposed upstream of the universal mill 16 and includes a web deviation measuring means 17 for measuring the height position of the web 11b of the rolled material 11, and a web 11b measured by the web deviation measuring means 17. Based on the height position, the web deviation amount S is calculated, and on the basis of the web deviation amount S, the upper and lower offset amounts ε1 or ε2 for eliminating the web deviation of the upper and lower horizontal rolls 12 and 13 are calculated. An arithmetic unit 18 to calculate, and a pair of hydraulic upper and lower side lowering devices 19 and 20 which are examples of horizontal roll height adjusting means for changing the height positions of the upper and lower horizontal rolls 12 and 13, and control Part 22. In this embodiment, the arithmetic unit 18 is built in the web deviation measuring means 17, and roll chocks 23 and 24 are attached to both ends of the roll shafts 12 a and 13 a of the upper and lower horizontal rolls 12 and 13. Has been.
[0008]
Web deviation measuring unit 17, of the flange 11a of at least the rolling member 11, an upper length B ₁ of the upper side of the upper surface of the web 11b, capable of measuring devices and a lower length B ₂ of the lower side of the lower surface of the web 11b As long as it is anything, for example, the dimensions of each part of the rolled material 11 that is H-shaped steel such as that described in “Online Dimension Measurement Device for Shaped Steel” of Japanese Patent Application Laid-Open No. 4-213014 are automatically measured. Examples thereof include devices.
In this apparatus, a pair of left and right flange width upper end distance measuring devices and a flange width lower end distance measuring device are arranged opposite to each other in the upper and lower directions of the rolled material 11, and the distance between the height direction and the horizontal direction is set. The distance to the end of the flange 11a is measured while adjusting, and the flange width and the thickness thereof are calculated by a built-in calculation device. Are mounted so that the position can be adjusted in the horizontal direction, the distance to the web surface is measured to obtain the web thickness, and the amount of web deviation is calculated based on each distance measurement value.
[0009]
Here, the web deviation amount S and the upper and lower offset amounts ε1 and ε2 in the upper and lower horizontal rolls 12 and 13 will be described.
As shown in FIG. 2, first, the web deviation measuring means 17 has an upper length B ₁ above the upper surface of the web 11 b in the flange 11 a of the rolled material 11 and a lower portion of the flange 11 a below the lower surface of the web 11 b. measuring the lower length B _2. Based on these, the web deviation amount S is obtained by the following equation.
S = (B ₁ −B ₂ ) / 2 (1)
The amount of web deviation S indicates the amount of displacement of the web 11b from the ideal H-section web position that is symmetrical to the top, bottom, left, and right. Then, the upper offset amount ε1 or the lower offset amount ε2 of the upper horizontal rolls 12 and 13 for correcting the web deviation is corrected by a finish rolling mill that performs rolling in one pass. It is necessary to make it larger than the bias amount S. Because, when the upper and lower horizontal rolls 12 and 13 are offset, the entire rolled material 11 moves in the same direction, the relative displacement amount of the web 11b with respect to the flange 11a, that is, the web deviation correction amount is based on the offset amount ε1 or ε2. It is also because it becomes small. On the other hand, when correcting with an intermediate rolling mill that performs multi-pass rolling, the offset amount ε1 or ε2 does not necessarily have to be larger than the web deviation amount S, and may be selected so that the web deviation is finally eliminated.
[0010]
The upper and lower side reduction devices 19 and 20 are devices for raising and lowering the roll chocks 23 and 24 by inserting and removing the rods of the hydraulic cylinders 19a and 20a. For example, Japanese Patent Publication No. 3-33411 “Rolling device for rolling mill” Those described in the above can be adopted.
In this device, the spool is linked to a servo actuator that detects the position of the cylinder ram (rod), and this spool can be moved within a sleeve integrated with the cylinder ram, and the spool and sleeve constitute a spool valve. As a result, the piping length between the valve and the cylinder can be made substantially zero, and the responsiveness can be maintained satisfactorily, and the cylinder ram position control is mechanically incorporated into the cylinder ram by interlocking with the servo actuator. It is configured so that it can be performed.
[0011]
As shown in FIG. 4, the control system of the shape steel rolling device 10 has the control unit 22 as a main body, an arithmetic unit 18 built in the web deviation measuring means 17 as an input unit, and upper and lower side reduction devices. 19 and 20 hydraulic cylinders 19a and 20a are used as output units.
The control unit 22 allows the rods of the hydraulic cylinders 19a and 20a of the upper and lower side reduction devices 19 and 20 to be taken in and out based on the offset amount ε1 or ε2 calculated by the arithmetic device 18 built in the web deviation measuring means 17. As a result, the upper and lower horizontal rolls 12 and 13 are offset-controlled upward and downward from the mill center a (see FIG. 2) while keeping the gap between the upper and lower horizontal rolls 12 and 13 constant.
[0012]
Next, a shape steel rolling method using the shape steel rolling device 10 according to one embodiment of the present invention will be described.
As shown in FIG. 1, the rolled material 11 that has been transferred on the table is fed into the universal mill 16 after passing through the web deviation measuring means 17, and the upper and lower horizontal rolls 12 and 13 and the left and starboard rolls. 14 and 15 are formed by rolling.
In web deviation measuring unit 17, an upper length B ₁ of the flange 11a of the rolled material 11 in the transfer, by substituting measuring the lower length B _2, the values obtained for the expression of the (1) web The deviation amount S is obtained, and the offset amounts ε1, ε2 of the upper and lower horizontal rolls 12, 13 are obtained based on the web deviation amount S.
As shown in FIG. 4, the obtained offset amounts ε1 and ε2 are sent to the control unit 22, and then the hydraulic cylinders 19 a and 20 a of the upper and lower side reduction devices 19 and 20 according to a rod insertion / removal command from the control unit 22. These rods are simultaneously inserted and removed by an offset amount ε1 or ε2. Thus, the upper and lower horizontal rolls 12 and 13 keep the gap between the upper and lower horizontal rolls 12 and 13 constant, and the gap center c between the upper and lower horizontal rolls 12 and 13 is raised from the mill center a. , Is automatically offset downward (here, upward) (see FIG. 3). In FIG. 3, the symbol b indicates a web center.
[0013]
Thus, in the vicinity of the universal mill 16 during rolling, the web deviation amount S of the rolled material 11 is measured and calculated by the web deviation measuring means 17 and the computing device 18, and based on the web deviation amount S by the control unit 22. While maintaining the gap between the upper and lower horizontal rolls 12 and 13 constant, the upper and lower horizontal rolls 12 and 13 are moved upward and downward from the mill center a by the offset amounts ε1 and ε2 for eliminating the web deflection amount S. Since the offset is performed, not only the web bias can be prevented, but also the web bias over the entire length of the rolled material 11 can be corrected by adjusting the offset amounts ε1 and ε2 according to the variation of the web bias over the entire length of the rolled material 11 during rolling.
As mentioned above, although embodiment of this invention was shown, this invention is not limited to this, Even if there is a design change in the range which does not deviate from a summary, it is contained in this invention.
For example, in the present embodiment, the H-section steel is adopted as the section steel having the flange 11a. However, the present invention is not limited to this.
[0014]
【The invention's effect】
In the shape steel rolling apparatus according to claim 1, during the rolling or non-rolling as described above, the upper and lower horizontal rolls are eliminated by the amount of eliminating the web deviation while keeping the gap between the upper and lower horizontal rolls constant. Since the web position is adjusted by offsetting up and down from the mill center, it is possible to cope with fluctuations in the web deviation over the entire length of the rolled material during rolling, and the web deviation can be corrected over the entire length of the rolled material.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a shape steel rolling apparatus according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a web bias correction operation by a universal mill when the upper and lower horizontal rolls are offset upward.
FIG. 3 is an explanatory view showing a rolled material before, during and after correction of web deviation by a universal mill when the upper and lower horizontal rolls are offset upward.
FIG. 4 is a block diagram of a control system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10: Shape steel rolling apparatus, 11: Rolled material, 11a: Flange, 11b: Web, 12: Upper horizontal roll, 12a: Roll axis, 13: Lower horizontal roll, 13a: Roll axis, 14: Reed roll (Left roll) ), 15: reed roll (starboard roll), 16: universal mill, 17: web deviation measuring means, 18: arithmetic unit, 19: upper reduction device, 19a: hydraulic cylinder, 20: lower reduction device, 20a: Hydraulic cylinder, 22: control unit, 23: roll chock, 24: roll chock, B ₁ : flange upper length (upper length), B ₂ : flange lower length (lower length), S: web deviation, a: Mill center, b: web center, c: upper, lower horizontal roll offset after upper, lower horizontal roll gap center (upper, lower horizontal roll gap center), ε1: upward offset, ε 2: Downward offset amount

Claims (1)

In a shape rolling apparatus for rolling by feeding a rolled material of a shape steel having a flange into a universal mill in which upper, lower horizontal rolls and left and starboard rolls are incorporated,
A web deviation measuring means arranged in the vicinity of the universal mill for measuring the web deviation of the rolled material,
Based on the measurement result from the web deviation measuring means, the web deviation amount is calculated, and on the upper and lower horizontal rolls based on the web deviation amount, an arithmetic device that calculates an offset amount in the downward direction;
Horizontal roll height adjusting means for raising and lowering the upper and lower horizontal rolls;
Based on the offset amount calculated by the arithmetic unit, the horizontal roll height adjusting means during the rolling or non-rolling, while maintaining the gap between the upper and lower horizontal rolls constant, the upper, lower horizontal A shape steel rolling apparatus comprising a control unit for offsetting a roll upward and downward from a mill center.

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