JPH0760328A - Highly accurate guiding device for rolling h-shaped steel - Google Patents

Abstract

PURPOSE:To obtain a product excellent in dimensional accuracy and very small in the center bias of web by supporting upper and lower roller shapes by connecting levers and making intervals of the upper and lower rollers to be freely moved and fixed vertically symmentical to the center line of the pass line of an universal rolling mill. CONSTITUTION:Upper and lower guide rollers 2a, 2b are held to be freely rotatable by upper and lower roller support shafts 3a, 3b through bearings. The upper and lower support shafts 3a, 3b are supported by connecting levers 4a, 4a, 4b, 4b link-joined like a pantograph through upper and lower connecting parts 5a, 5b. The amount of web center bias of a steel detected by a web bias meter 10 and the positional data of the pass line from the universal rolling mill are inputted to a controller. Then, the amount of to relativaly change the position of flange center line of the H-shape steel against the center line of pass line for rolling of next pass is calculated and the changed amount is outputted to each guide box.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing apparatus by rolling an H-shaped material, and more particularly to a guiding apparatus for correcting the deviation of the web center during rolling of the H-shaped material and maintaining it with high accuracy. .

[0002]

2. Description of the Related Art Conventionally, a general method for manufacturing an H-shaped material by universal rolling is, as shown in FIG. 5, a slab material having a rectangular cross section heated by a heating furnace 11 and a rough rolling machine 12,
A method of rolling the intermediate universal rolling mill 91 and the edger rolling mill 92 by the intermediate rolling mill train 13 arranged in tandem and the finishing universal rolling mill 14 is adopted. The rough rolling mill 12 in this step is usually a 2Hi rolling mill in which a plurality of hole dies are engraved, and the slab material is shaped into a dogbone-shaped rough material by the rough rolling mill 12. Next, an intermediate universal rolling mill 91 having upper and lower horizontal rolls 91a and left and right vertical rolls 91b shown in FIG.
Then, the reverse rolling is performed in the intermediate rolling mill train in which the edger rolling mill 92 having the upper and lower horizontal rolls 92a shown in FIG. 6B is combined. Subsequently, similarly to the intermediate universal rolling mill 91 of FIG. 6A, the upper and lower horizontal rolls 14
In the finishing universal rolling machine 14 having a (reference numeral is shown in parentheses) and left and right vertical rolls 14b,
Usually it is finished in one pass. After the rolling is finished, the saw is cut into a predetermined length by the saw 15 shown in FIG. At this time, since the product is bent vertically and horizontally, the product is corrected by the roll straightening machine 17 to be the final product.

In the H-shaped material manufactured by the above-mentioned process, various unsteady fluctuations occur during rolling such as rolling temperature and shaping mechanism, and as a result, dimensional fluctuations occur in the cross section in the longitudinal direction of the product. Among them, the material is not accurately inserted into a line segment (hereinafter, referred to as a pass line center line) that passes through the center of the gap between the upper and lower horizontal rolls of the universal rolling mill and is parallel to the rolling direction. The difference (| B1-B2 | / 2) in the width of the flange piece at 1 is a serious problem for the quality of the product.

Therefore, in order to obtain an H-shaped material having a good product shape, especially when reverse rolling is performed by the universal rolling mill and the edger rolling mill in the intermediate rolling mill train, the center line of the pass line and the flange of the H-shaped mill are used. The line segment that passes through the center position of the width (hereinafter referred to as the flange center line) is always matched, or the path line center line and the web center position of the material are matched on the assumption that the web center is located at the flange width center position. It is important to let However, the vertical position of the roller traveling table for supporting the material before and after the rolling mill or the guide placed in front of the rolling mill corresponds to the flange center line of the rolled material and the pass line center line of the roll, which constantly change with rolling. It is difficult to set it for each path each time because of the device setting or the equipment cost.
The height of the roller traveling table and the center positions of the upper and lower rolls of the rolling mill were adjusted at the time of changing the roll type before rolling according to the nominal flange width of the material.

Various means have been proposed so far for eliminating the web deviation of the H-shaped material as much as possible, and the applicant has previously proposed, for example, Japanese Patent Publication No. 53-34585 and Japanese Patent Publication No. 53-345.
In the technology disclosed in Japanese Patent No. 87, that is, a pair of upper and lower guide rollers are arranged at a predetermined interval in the rolling direction on the entrance side of a universal rolling mill, and the gap between the guide rollers is substantially equal to the flange width of the H-shaped member, Moreover, a means for adjusting and setting the center line passing through the center of the roller gap so as to substantially coincide with the center line of the pass line of the universal rolling mill was provided. FIG. 7 shows an embodiment thereof, in which the upper guide rollers 18a and 19a are movably supported by respective position setting screws 20a so as to guide the upper flange end 1a of the rolled material 1. Further, the lower guide rollers 18b and 19b are movably supported by respective position setting screws 20b.
Guide the lower flange end 1b of the rolled material 1. The upper guide rollers 18a, 19a and the lower guide rollers 18b, 19b are positioned so that the center line C1 of the flange width of the rolled material 1 coincides with the center line C2 of the roll gap of the upper and lower horizontal rolls 14a. The upper guide roller 18a and the lower guide roller 1
8b, and upper guide roller 19a and lower guide roller 19b
Are arranged in facing positions. In the drawing, 14b is a vertical roll, X is a traveling direction of the rolled material, 30 is a setting position control device for setting the position of the vertical guide roller, 31 is a setting position calculation device, 32 is a flange width setting device, and 33 is a flange width measuring device. Is.

However, this conventional guiding device has the following drawbacks. That is, the flange width F of the rolled material 1 has a large dimensional change in the longitudinal direction not only between the bars but also inside the bars, and it is extremely difficult to measure the flange width F with the flange width measuring device 33 at every moment during rolling. Further, according to the measured value, the upper guide rollers 18a, 19a and the lower guide roller 18
The flange width setting device 32 is provided for each of the positions b and 19b.
Therefore, it is difficult to keep the flange centerline C1 of the material aligned with the passline centerline C2 of the universal rolling mill on the same horizontal plane by adjusting every minute, and it requires a great deal of equipment cost. On the other hand, the upper guide roller 18a,
When the rolled material 1 is sandwiched and guided by 19a and the lower guide rollers 18b and 19b, the rolled material can be guided with high accuracy. However, since the flange width of the rolled material fluctuates, when the rolled material is sandwiched and guided, if the flange width F is larger than the set interval of the vertical guide roller, the change of the set interval cannot follow the fluctuation of the width. A misroll occurred because it could not pass between the upper and lower guide rollers. Therefore, in actual rolling, the setting interval of the upper and lower guide rollers must be made sufficiently larger than the flange width F of the rolled material 1 to avoid the occurrence of misrolling due to the impossibility of passing the material, which is effective in suppressing the web deviation. It couldn't be a means. As described above, the accuracy of the above-mentioned conventional means is naturally limited due to the structure of the apparatus, and at present, according to the JIS standard, the web accuracy of ± 3 mm is the highest accuracy that can be stably obtained.

On the other hand, recent trends in the construction and civil engineering industries are toward labor saving and automation. Improvement of dimensional accuracy is essential for this automation. That is, the members of each H-shaped member are combined and welded or bolted, but if there is a web deviation at that time, the combining work becomes difficult, and the closer the error is to zero, that is, the higher the dimensional accuracy, the more automated. Will be easier and the efficiency will be improved. However, as described above, it is difficult for the conventional technology to completely deal with this.

[0008]

DISCLOSURE OF THE INVENTION The present invention is capable of highly accurately preventing the web deviation of the material to be rolled in the longitudinal direction when rolling the H-shaped material by a universal mill.
Moreover, it is an object of the present invention to provide a guiding device for profile rolling, which has a relatively simple structure and does not require a special control device or a dimension / shape detection end.

[0009]

SUMMARY OF THE INVENTION The present invention has the following features. That is, in a device for guiding both end surfaces of the upper and lower flanges of the H-shaped member with guide rollers and guiding them to the universal rolling mill, at least four connecting rods are used to form a pantograph-like connecting rod that is link-coupled to each other around the pair. The guide roller is rotatably provided on the upper and lower support shafts supported by the connecting rod, and the horizontal center line connecting the axis centers of the left and right support shafts of the connecting rod is flush with the pass line center line of the universal rolling mill. And a link opening / closing drive source is connected to either one of the left and right supporting shafts, and the upper and lower supporting shafts can be freely opened and closed symmetrically with respect to the center line of the pass line. The high-accuracy guiding device for H-section rolling according to the above item, wherein the center line between the left and right support shafts of the pantograph-shaped connecting rod is provided so as to be vertically movable. A high-precision guiding device for H-section rolling, wherein the high-precision guiding device for H-section rolling according to the above item or section is arranged on the front surface and the rear surface in the rolling direction of a universal rolling mill.

The starting support point of the pantograph-shaped connecting rod is
The high-precision guiding device for H-section rolling according to the item 1 or 2, which holds a constant pressure with a liquid pressure cylinder during induction of the rolled material and holds a fixed position during non-induction of the rolled material. And the roll radius Rv of the vertical roll of the universal rolling machine
And the roll radius Rh of the horizontal roll are set to the relationship of the following formula (1), or the high precision induction device for H-section rolling according to each of the above items or. 2Rv ・ Δtf> Rh ・ Δtw (1) where Rv: Roll radius of vertical roll (mm) Rh: Roll radius of horizontal roll (mm) Δtf: One pass reduction of flange Amount (mm) Δtw: 1-pass rolling amount of the web (mm) The projected contact length Lf of the flange and the projected contact length Lw of the web satisfy the following formula (2) from the axis of the horizontal roll of the universal rolling mill. As described above, the axis of the vertical roll is movable with respect to the axis of the horizontal roll, or the axis of the horizontal roll is movable with respect to the axis of the vertical roll in the front-rear direction of the rolling, or, respectively. 3 is a high-precision guiding device for H-shaped material rolling. Lf> Lw ……………………………………………… (2) where Lf: Projected contact length of flange (mm) Lw: Projected contact length of web (mm)

[0011]

First, the basic structure and operation of a conventional induction device in the conventional H-section rolling will be described. Guides provided before and after the rolling mill are devices intended to guide the material from the roller traveling table to the rolling mill, and more precisely to the roll center. The guides used for rolling the H-shaped member have been devised in various ways depending on the place of use and the purpose thereof, and generally have different shapes and structures. However, in general, all are so-called fixed guide friction type or roller type, and by supporting the flange tip or the web, the center of the material web is generally the pass line of the universal roll regardless of the web deviation of the material. It has a structure that guides you to the center.

However, this method is not always appropriate if the material before the biting into the universal rolling mill has a web deviation, but rather, depending on the web deviation of the material, the insertion and up and down of the material with respect to the universal are performed. The position should be corrected, but in many cases it is unknown whether or not the material web is biased during rolling, and it is difficult to freely change the position of the guide. The actual situation is that there is no choice but to properly guide and guide based on the value.

In principle, as a method of eliminating the deviation of the web center, if the upper and lower flange tips are constrained and the center of the flange width coincides with the center of the pass line, so-called "web replacement" is used. It is known that correction of central deviation is possible. This principle is shown in FIG.
That is, the widths B1 and B2 of the flanges are determined by the guides shown in the drawing so that the widths of the flanges can be set as long as the material is kept straight in the longitudinal direction before and after the rolling rolls. As the web advances, the web is forcibly rolled down by the horizontal roll, the web moves toward the center of the horizontal roll, and B1 = B2. At this time, the existence of the pressure reduction area of the flange by the vertical rolls tends to keep the flange in the bite position due to the restriction of the flange position, and promotes the replacement of the web. Therefore, it is most important to feed the rolled material so that the flange center line of the material coincides with the pass line center line of the universal roll.

The basic technical idea of the present invention is to support the shafts of the upper and lower rollers, which guide by contacting and gripping both end faces of the upper and lower flanges of the rolled material, with a pantograph-shaped connecting rod so that the guide rollers accurately guide the flange tips. Guide to always align the flange center line of the incoming material with the pass line center line of the universal rolling mill (the guide rollers are automatically symmetrically arranged with respect to the pass line center line of the universal rolling mill). . The apparatus of the present invention does not generate a new web deviation when the material before the universal rolling has no web deviation, and for a material with a web deviation, a so-called "web replacement" causes a web center deviation. It enables correction.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 (a) and 1 (b) show a front view and a side view of an example of an apparatus corresponding to claim 1 of the present invention. An upper guide roller 2a for constraining and guiding the upper flange end 1a of the rolled material 1 and a lower guide roller 2b for constraining and guiding the lower flange end 1b are provided on the front surface of the intermediate universal rolling mill 91 or finishing universal rolling mill 14. It is arranged. The upper and lower guide rollers 2a and 2b are rotatably held by upper and lower roller support shafts 3a and 3b (hereinafter simply referred to as upper and lower support shafts) via bearings. The upper and lower support shafts 3a and 3b are connected to the upper and lower connecting portions 5a,
It is supported by at least four connecting rods 4a, 4a, 4b, 4b linked in a pantograph manner via 5b. That is, the mutual movement of the connecting rods 4a, 4a, 4b, 4b is supported so as to be capable of "rotating pair" rotational movement.

The upper and lower support shafts 3a, 3 are attached to the upper and lower connecting portions 5a, 5b.
It is also possible to reduce the diameters of the upper and lower guide rollers 2a and 2b by providing a bearing portion of b and substituting for the bearing. One ends of the connecting rods 4b, 4b are fixed in the rolling direction by a support shaft P0 on the right side of the drawing which serves as a fixed connecting portion. The support shaft P1 on the left side of the other end is a starting support point of the link mechanism, and depending on the flange width F of the rolled material in the rolling direction via the connected rod 6, by a link opening / closing drive source using a hydraulic cylinder 7, for example. It is supported so that it can be adjusted. The horizontal center line connecting the left and right spindles P1 and P0 is set in the same horizontal plane as the pass line center line of the universal rolling mill. Further, when a portion having a large flange width enters the upper and lower guide rollers 2a and 2b in the longitudinal direction of the rolled material, the liquid pressure cylinder 7 is used to prevent the upper and lower guide rollers 2a and 2b from being applied with an excessive load.
It has a so-called self-release mechanism that enlarges the gap of 2b and automatically avoids the occurrence of overload. While guiding the rolled material 1 coming from the direction of the arrow X, the pressure of the liquid pressure cylinder 7 is set to the minimum necessary pressure value with which the upper and lower guide rollers 2a and 2b can ensure a reliable contact state with the upper and lower flange end portions 1a and 1b. By doing so, it is possible to automatically follow the change in the flange width and always match the flange center line C1 with the pass line center line C2 of the universal rolling mill.

In principle, the guide roller is non-driving.
The contact between the guide roller and the end of the flange can be determined by the rotation of the roller or the load acting on the roller. Even if the guide roller is not driven, the force for pinching the rolled material 1 limits the pressure of the liquid pressure cylinder 7 to the minimum necessary pressure value for maintaining the contact state between the upper and lower rollers and the rolled material 1. The material can be sufficiently passed by the force, the pulling force, the conveying force by the roller table, or the inertial force of the conveyed steel material. Further, while the rolled material 1 is not guided after being kicked out, by holding the position of the movable connecting portion P1 which is the starting support point so that the interval between the upper and lower guide rollers is the same as the planned flange width of the next material, The biting of the tip of the rolled material is smoothly performed.

Here, the support shaft P0 (fixed connecting portion) and the support shaft P
1 (starting support point) is held on the horizontal plane of the pass line center line C2 by a guide box (not shown),
Further, the guide box is attached to a guide base (not shown). The structures of these guide boxes and guide bases are the same as those of conventionally known devices.

The intermediate material rolled by the rough rolling mill is reciprocally rolled by a row of intermediate rolling mills equipped with the guiding device of the present invention having the above-mentioned structure, and the intermediate material rolled by the rough rolling mill of the preceding stage is rolled to some extent with a web. Even if the center deviation is present, the web center deviation is corrected by accumulating the reciprocating rolling by the replacement of the web, and a good product is obtained. However, when the web center deviation of the intermediate material rolled by the rough rolling mill is large, or when a high web center deviation accuracy is aimed, it is effective to further use the following rolling means.

That is, in FIG. 1, the web deviation meter 10 is installed in front of the guide roller, and the guide box for holding the support shaft P0 (fixed connecting portion) and the support shaft P1 (starting support point) is vertically moved. It has a structure that can be moved and adjusted freely. First
Immediately before the pass or in any intermediate universal rolling pass, the web center deviation amount of the material detected by the web deviation meter 10 and the position data of the pass line center line from the universal rolling mill are input to the control device. The pass line adjustment amount, that is, the amount by which the position of the flange center line of the H-shaped material should be relatively changed with respect to the pass line center line of the universal rolling mill in the next pass rolling is calculated, and the change amount is calculated according to each of the guides described above. Output to the box. As a result, the pass line center line C2 and the H-shaped flange center line C
The position 1 is displaced in the vertical direction by the pass line adjustment amount. That is, when the web center deviation occurs in the material, the position of the flange center line of the H-shaped material with respect to the pass line center line is changed according to the web center deviation amount to be corrected, and when it is bitten into the universal rolling mill. It is the one that will actively change the web. The web deflector used here may use a normal shape detecting end such as a profile meter, but in the state where the roller guide is in contact with the flange tip of the material in a specific pass, the center (web It may be possible to detect the web center deviation amount of the material by detecting the position with respect to the center) In the above embodiment, the case of performing reverse rolling in the intermediate rolling mill train has been described, but in the continuous mill without reverse rolling, The object of the present invention can be achieved by installing the guiding device of the present invention between the last one and two stands.

The guide rollers applied here are not necessarily limited to the one pair shown in FIG. 1, but two pairs as shown in FIG. 2A or further three pairs as shown in FIG. By supporting at three points, it is possible to further enhance its straightness inducing property. In the present invention, the number of connecting rods constituting the pantograph-shaped connecting rod is at least four for the above reason. Further, the installation position is not necessarily limited to the front surface of the rolling mill shown in FIG. 1 even when rolling in one direction, and it is installed on both the front surface and the rear surface in the rolling direction of the rolling mill as shown in FIG. By doing so, the induction effect can be further enhanced.

In each of the embodiments shown in FIGS. 2 (a), 2 (b) and 3 (a), there is only one pantograph-shaped connecting rod 8 for supporting the upper and lower guide rollers 2am, 2bm adjacent to the rolling mill side. It is a cantilever type. This is to bring the upper and lower guide rollers 2am and 2bm as close as possible to the rolling roll to enhance the guiding effect. The smaller the distance between the upper and lower guide rollers 2am and 2bm adjacent to the rolling mill and the horizontal roll, the more accurately the guide can be performed, and the straightness of the flange of the rolled material can be maintained. For this purpose, it is effective to reduce the roller diameter.

Further, as shown in FIG. 3 (b), the support shaft P0 of the pantograph-shaped connecting rod 8 is slidable in the left-right direction, and the upper and lower guide rollers 2am on either or both of the front and rear surfaces of the rolling mill. When the 2bm support shaft and the horizontal roll shaft center OH are connected by the link pieces 4am and 4bm, the upper and lower guide rollers 2am and 2am regardless of the change in the flange width.
Since the center of bm operates concentrically with the axis of the horizontal roll, the distance between the upper and lower gad rollers 2am and 2bm and the peripheral surface of the horizontal roll can be made as close as possible. However, in this case, the pantograph-shaped connecting rods 4a and 4b which support 2am and 2bm from the structure are of a both-end type.

Here, in the universal rolling machine, the roll radius Rv of the vertical roll and the roll radius R of the horizontal roll.
If h is set so as to satisfy the following formula (1), the flange gripping effect during rolling by the vertical rolls increases,
The effect of replacing the web is strengthened, and the guiding device of the present invention can further exhibit the action of correcting the web center deviation. 2Rv ・ Δtf> Rh ・ Δtw (1) where Rv: Roll radius of vertical roll (mm) Rh: Roll radius of horizontal roll (mm) Δtf: One pass reduction of flange Amount (mm) Δtw: 1-pass rolling amount of the web (mm) Further, for the same reason, in the universal rolling machine, the projected contact length L of the flange from the axis of the horizontal roll is L.
f and the projected contact length Lw of the web satisfy the following formula (2), the axis of the vertical roll is the axis of the horizontal roll, or the axis of the horizontal roll is the axis of the vertical roll. It is also useful to provide such that it can be moved in the front-back direction of rolling. Lf> Lw ……………………………………………… (2) where Lf: Projected contact length of flange (mm) Lw: Projected contact length of web (mm)

[0025]

EFFECT OF THE INVENTION The guiding apparatus for H-section rolling of the present invention has the function of centering the web following the fluctuation of the flange width of the material to be rolled while maintaining reliable contact between both ends of the flange and the roller. In addition, it is possible to manufacture the H-shaped material which is excellent in the accuracy of the center position of the web by suppressing the deviation of the web center over the entire rolling length while preventing the occurrence of the misroll and the defective shape of the flange tip.

[Brief description of drawings]

1A and 1B are schematic front and side views showing an embodiment of the device of the present invention.

FIG. 2 is a schematic diagram illustrating another guiding device used in the present invention.

FIG. 3 is an explanatory schematic view of still another guiding device used in the present invention.

FIG. 4 is a schematic view showing cross-sectional portions and dimensional relationships of an H-shaped member.

FIG. 5 is a schematic diagram of a manufacturing process of a rolled H-shaped material.

6 (a) and 6 (b) are schematic diagrams showing a universal and edger rolling method for H-shaped members.

FIG. 7 is an explanatory diagram of a conventional guiding device.

FIG. 8 is an explanatory view of changing the web center deviation of the H-shaped member.

[Explanation of symbols]

 1 rolled material (H-shaped material) 1a, 1b upper and lower flange end portions 2a, 2b, lower guide rollers 3a, 3b, lower roller support shafts 4a, 4b, lower pantograph-shaped connecting rods 5a, 5b Upper and lower connecting parts 6 Rod 7 Liquid pressure cylinder 8 Pantograph connecting rod 10 Web deviation meter 11 Heating furnace 12 Rough rolling mill 13 Intermediate rolling mill train 14 Finishing rolling mill 15 Saw cutting machine 16 Cooling floor 17 Roller straightening machine P0 Spindle (Fixed connection part) P1 Support shaft (Starting support point) C1 Flange center line C2 Pass line center line F Flange width X Rolling direction

Claims (6)

[Claims] 1. A pantograph-shaped connecting rod in which at least four connecting rods are link-joined in a circumferential pair in a device in which both end surfaces of the upper and lower flanges of an H-shaped member are held by guide rollers and guided to a universal rolling mill. The guide roller is rotatably provided on the upper and lower support shafts supported by the connecting rod, and the center line connecting the axis centers of the left and right support shafts of the connecting rod is in the same horizontal plane as the pass line center line of the universal rolling machine. And a link opening / closing drive source is connected to either one of the left and right supporting shafts, and the upper and lower supporting shafts can be opened and closed symmetrically with respect to the center line of the pass line. High precision guidance device. 2. The high-precision guiding apparatus for H-section rolling according to claim 1, wherein the center line between the left and right support shafts of the pantograph-shaped connecting rod is provided so as to be vertically movable. 3. A high-accuracy induction device for H-section rolling, wherein the high-accuracy induction device for H-section rolling according to claim 1 or 2 is arranged on the front surface and the rear surface in the rolling direction of a universal rolling mill. apparatus. 4. The starting support point of the pantograph-shaped connecting rod,
The high precision induction for H-section rolling according to claim 1, 2, or 3, wherein a constant pressure is held by a liquid pressure cylinder during induction of the rolled material, and a fixed position is maintained during non-induction of the rolled material. apparatus. 5. The relationship between the roll radius Rv of the vertical roll and the roll radius Rh of the horizontal roll of the universal rolling mill is set to the relationship of the following formula (1).
2. A high precision induction device for H-section rolling according to 2, 3, or 4, respectively. 2Rv ・ Δtf> Rh ・ Δtw (1) where Rv: Roll radius of vertical roll (mm) Rh: Roll radius of horizontal roll (mm) Δtf: One pass reduction of flange Amount (mm) Δtw: Web 1 pass reduction amount (mm) 6. The shaft center of the vertical roll is set horizontally so that the projected contact length Lf of the flange and the projected contact length Lw of the web satisfy the following expression (2) from the shaft center of the horizontal roll of the universal rolling mill. The axis of the roll or the axis of the horizontal roll is provided so as to be movable in the front-rear direction of rolling with respect to the axis of the vertical roll. High-precision induction device for H-shaped material rolling. Lf> Lw ……………………………………………… (2) where Lf: Projected contact length of flange (mm) Lw: Projected contact length of web (mm)