JPS61137622A - Continuous rolling mill for angle material - Google Patents

Abstract

PURPOSE:To roll continuously a shape steel with 3-high and 2-high mills by disposing inlet side and outlet side guides as well an outside wall opening repeater with an inside wall notch to one side of the 3-high mill and disposing inlet side and outlet side twist guides and an outside wall opening twist repeater with a bulging part to the other side. CONSTITUTION:The rolling material emitted from the lower stage of the 3-high mill 1 passes through the outside wall 7 opening repeater 3 which is provided with the inlet side guide 2, inside wall 5 notch 8 and is operated by the signal from a phototube 1 and the outlet side guide 4 and enters the upper stage of the mill 1. The rolling material emitted from the upper stage passes through the inlet side twist guide 12, the outside opening type twist repeater 13 with the bulging part 25 and the outlet side twist guide 14 and is sent into the 2-high mill. The rolling material is successively twisted 180 deg. by the twist rollers 22 of the guides 12, 14 and the guide rollers 23 of the repeater 13. The notch 8 and bulging part 25 of the repeaters 3, 13 absorb the elongated rolling material to eliminate the trouble when the outside walls 7, 17 fail to open or the trouble arises in releasing the elongated rolling material. The multi-stands continuous rolling of the shape steel is made possible by the above-mentioned method.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an angle material continuous rolling apparatus for continuously manufacturing angle material with a desired cross-sectional shape using rolling mills arranged in parallel. be.

<Prior art and its problems> Conventionally, when manufacturing a long angle material by rolling, a plurality of rolling mills are arranged in parallel, and the rolling load of the rolled material is transferred by cross-feeding using a transfer or the like. It was common practice to sequentially bite the rolled material into the rolls of each rolling mill to give it a desired cross-sectional shape.

However, with this method, it takes too much time to transfer the rolled material between the rolling mills, resulting in a significant drop in temperature of the material, which not only accelerates the wear of the roll caliber and worsens the roll consumption rate. It has also been pointed out that this method is disadvantageous in that it may lead to a deterioration in the quality of the product surface.

Incidentally, in recent years, when rolling flat steel materials or steel bars is carried out using a plurality of rolling mills arranged in parallel, a repeater as shown in FIG. It has become common practice to continuously guide the rolling stock between the rolls of each rolling mill.

A plan view is shown in FIG. 9(a), and the person-A
#The repeater whose T-side view is shown in FIG. 9(b) has the bottom plate 3.
An inner wall 32 curved with a desired curvature is fixed on the top of the rolled material 1, and a guide groove 3 for conducting the rolled material is installed opposite the inner wall 32.
3 is installed so that it can be raised and lowered by an elevating device (not shown), and when the rolled material is continuously sent out from the rolling mill 35, the tip of the material is first raised as shown in FIG.
The material to be rolled enters the guide groove 33 of the repeater as shown by the arrow in a), but due to the driving force of the rolling mill 35, the tip of the rolled material, which is progressing in a curved manner within the guide groove 33, deviates from the repeater and the next step. Immediately before or at the moment of being bitten by the rolling mill 36 at the position of It has become.

By the way, in this type of continuous rolling, the rolling mill 3 of the material to be rolled is
6 is set to be slightly slower than the speed at which the material is sent out from the rolling mill 35, in order to ensure flexibility in the rolling operation. When the tip advances by itself along the guide groove 33 and reaches the next rolling mill, the outer wall 34 is raised and the outer periphery of the guide groove 33 is opened, so that the rolled material sent out from the rolling mill 35 guide groove 33 without any obstruction.
This protrudes from the surface to form a loop, allowing smooth and stable continuous rolling.

In this way, the present inventors focused on the fact that by adopting a repeater, it became possible to carry out continuous multi-stand rolling using multiple rolling mills arranged in parallel, significantly improving work efficiency and product quality. attempted to apply such a repeater to rolling angle materials, and found that conventional repeaters could not curve smoothly due to the rigidity of the material to be rolled, and were unable to ensure products with accurate cross-sectional shapes. The result was that we had no choice but to conclude that it would be extremely difficult to do so.

Means for Solving the Problems> From the above-mentioned viewpoints, the present invention provides a method to smoothly and stably continuously roll angle materials by directly applying a conventional rolling device in which a plurality of rolling mills are arranged in parallel. This was completed through research conducted by the inventors of the present invention through numerous experiments and studies in order to find a method to do so. In, on the side opposite to the supply side of the rolled angle material of the three-roll rolling mill 1, there is an entry side guide 2 and an exit side guide equipped with a pinch roll 9 for correcting the direction of biting of the rolled angle material into the rolling rolls. 4, an inner cover 5 whose entry side end is partially cut out to define the inner circumferential surface of the rolled angle material guide groove;
an outer cover 7 that defines an outer circumferential surface of the guide groove and is detachably supported on the inner cover 5 by an attachment/detachment device (for example, an air cylinder) 6; and the inner cover 5 and the outer cover The guide groove defined by the rolling mill 1
It revolves around an axis parallel to the roll axis of the inner cover 5, and the position of its exit end is offset from that of its entry end in the axial direction without any spiral arc-shaped curve, and the inside is opened by the notch of the inner cover 5. A vertical 16-swivel repeater body 3 in which a mouth 8 is formed and accommodated is disposed, and the repeater body 3 is disposed on the rolled material delivery side of the three-roll rolling mill 1 and in parallel with the three-roll rolling mill 1. Between the next rolling mill 18 and the next rolling mill 18, (a) a plurality of gradually increasing inclinations for guiding the rolled angle material sent out from the three-stage o-roll mill to the horizontal rotating repeater main body 13 while gradually twisting it; (b) an inner cover 15 for defining the inner peripheral surface of the guide groove, and a rolled angle of the input twist guide. A plurality of guide rollers 23 (see FIG. 4) whose inclination gradually increases in succession with the inclination of the material guide path are attached to the inner surface, and can be freely attached to and detached from the inner cover 15 by an attaching and detaching device (for example, an air/ring) 16. As shown in FIG. (c) a horizontally rotating repeater main body 13 having an arc-shaped guide groove formed by installing a rolled angle material bulge detection device 26 at a position;
Continuing with the inclination of the guide rollers 23 of the horizontally rotating repeater body 13, the angle material to be rolled, which is sent out with its running direction changed by the horizontally rotating repeater body 13, is guided to the next rolling mill 18 while being further twisted. It consists of an exit twist guide having a guide path constituted by a plurality of twist straws 222 whose slope gradually increases. The twist rows 222 of the entry twist guide 12, the guide rollers 23 of the horizontally rotating repeater main body 13, and the twist rows 222 of the exit twist guide 14 are twisted so that the rolled angle material is twisted by an angle of 180 degrees. This apparatus is characterized in that a horizontal rotating repeater whose inclination angle is adjusted is arranged to constitute a continuous angle rolling apparatus.

In FIG. 1, the reference numeral 10 is a vertical holding plate, and the reference numeral 11 is a phototube device for detecting passage of the tip of the material to be rolled.

The above-mentioned "spiral arc-shaped curve" refers not only to a spirally twisted circular arc curve, but also to a shape in which the rolled material guided by the kite groove turns smoothly and is guided to a predetermined position without buckling. This is used as a general term for the curves shown in Figure 1. However, from the viewpoint of minimizing the repeater installation space, it is possible to turn the rolled material with the minimum turning diameter and effectively prevent the rolled material from buckling when it enters the repeater. An involute curve that gradually converges toward the side is recommended.

In addition, "arc-like" here includes not only a complete circular arc, but also a curve in which the rolled material guided by the guide groove turns smoothly and is guided to a predetermined position without bending. It was used as a generic term.

It goes without saying that the terms "vertical" and "horizontal" used here are not limited to their strict meanings, but have a wide range of meanings.

The guide groove of each repeater main body may also be formed using a surface such as the vertical holding plate IO shown in FIG. It goes without saying that it may be defined as such.

Furthermore, the pinch roll 9 attached to the exit guide 4 for correcting the biting direction of the rolled material may be of any type as long as it pinches and holds the rolled material and lightly pushes it out in the roll biting direction of the rolling mill. It does not matter, but because the guide groove of the repeater body is twisted, the high-temperature rolled material that has progressed at an angle to the roll biting direction can easily move from the rolling direction to the roll biting direction. This will be corrected.

However, in the repeater of this implementation file, the angle material was continuously rolled using a pinch roll die of the type shown in FIG. 2, and very good results were achieved.

That is, the pinch roll shown in FIG. 2 is as shown in FIG. 2(a).
As shown in the schematic diagram, the upper roll is supported and adjusted by an air cylinder 19, and there are two pairs of upper and lower rollers, one of which is angularly adjusted in the direction of progress of the rolled material from the repeater main body, and the other in the direction of biting of the rolling roll. It consists of rolls, and only one of the lower rolls is driven by a motor 20. As shown in the cross-sectional shape of the upper and lower rolls in FIG. 2), the lower roll is provided with a groove 21 for protecting the edge angle (pin angle) of the angle material.

By the way, the movement of the material to be rolled from entering the entry guide 2 to reaching the exit guide 4 is due to only the feeding force of the rolling rolls.

In order to ensure smooth running, it is desirable to arrange guide rollers in a row on the inner surface of the upper walls of the entry guide 2 and the exit guide 4 and on the inner peripheral surface of the outer cover of the vertically rotating repeater main body 3. In particular, when rolling shaped materials such as angle materials, smooth guidance of the material to be rolled is particularly important. It is strongly recommended that the

Of course, a normal type guide roller is sufficient.

Also, FIG. 3 shows an example of the arrangement of the entrance twist guide 120 and twist roller 22 of a horizontally rotating repeater, FIG. 4 shows an example of the arrangement of the guide rollers 23 in the horizontally rotating repeater body 13, and FIG. 5 shows an example of the arrangement of the horizontally rotating repeater body 12. 3 shows an example of the guide groove bulge 25, and FIG. 6 shows an example of the exit side twist guide 14.
Examples of the arrangement of the twist rollers 22 are shown.

Here, the change angle of the rolled angle material from entering the entry guide until coming out from the exit guide is 8
0 (degrees), but the reason for twisting the rolled angle material in this way is that without twisting, it is impossible to bend the rolled angle material without buckling and maintaining an accurate cross-sectional shape. Moreover, since the roll axis of a rolling mill is usually horizontal, if the twist angle is not set to 180 degrees, the material may flow inside the rolling mill or cause poor biting. From the explanation of r
It will be understood that "180 (degrees)" does not refer to a particularly exact value.

Next, all functions of the angle material continuous rolling apparatus configured as described above will be explained.

Now, in the apparatus shown in FIG. 1, the rolled angle material sent out from the three-roll rolling mill 1 is first guided by the entry guide 2 and enters the vertically rotating repeater main body 3.
After turning along the guide groove of the vertically rotating repeater main body 3, it is guided by the exit side guide 4 and pinch roll 9.
The direction is corrected at , and the angle material is bitten into the three-roll rolling mill 1 again. When the phototube device 11 detects the point at which the tip of the angle material to be rolled is sent out from the outlet guide 4, The interlocking attachment/detachment device (air cylinder device 6) begins to operate to retract the outer cover 7 toward the front in FIG. The tip of the rolled angle material that has reached the roll temporarily stops its progress (instantaneously) due to the repulsion caused by the collision with the roll or the "slip" of the roll, so that the rear part of the rolled angle material that follows As shown in FIG. 7, a slight kink is created at the position of the inner opening 8 of the guide groove.

Therefore, the tip of the rolled angle material is pulled back as shown by the arrow in FIG. The cover 7 can be easily and reliably evacuated. As a matter of course, the kink portion of the material to be rolled does not become so large that it does not cause any particular trouble in the next rolling.

In this way, at the same time as the outer cover 7 retreats from the guide groove position, the tip of the angle material to be rolled is bitten by the roll of the rolling mill, so that continuous rolling continues as it is, but the outer circumference of the guide groove of the beater body is By being open, the rolled angle material entering the repeater at a speed faster than the re-biting speed can expand the loop without any hindrance.

Furthermore, since the biting direction is corrected by the pinch rolls 9, the material to be rolled does not flow within the roll caliber, and smooth continuous rolling can be continued.

Next, the rolled angle material that has been rolled again in the three-roll rolling mill 1 is guided to the horizontally rotating repeater main body 13 while being twisted by the twist rollers 22 (non-driven) of the entrance twist guide 12.

In this example, an entry twist guide with 5 pairs of twist rollers was used with a pinch of 600 to 700+ m, and each twist roller was adjusted to the angle shown in Figure 3, but the angle material to be rolled was It passes between each twisted roller according to the torsional inertia given by the roller,
It was confirmed that the loss of rolling feed-out energy was extremely small.

The hatched diagram at the bottom of FIG. 3 schematically shows the twist angle of the rolled angle material at each part of the entrance guide.

The rolled angle material guided to the horizontal rotating mill beater main body 13 is guided by guide rollers 23 arranged in a row on the outer cover 17, and as the angle of twist increases gradually, the rolled angle material is transferred to the next rolling mill 1.
It runs on its own while making a smooth curve to the 8 side, and is then guided to the next rolling mill 18 while being further twisted by the twist rollers (non-driven) K of the exit twist guide 14.

At this time, a detection device (not shown, for example, a phototube device is placed near the entrance or exit of the exit guide) detects the moment when the tip of the rolled angle material is bitten by the next rolling mill 18 or the moment it gets bitten. ), the outer cover attaching/detaching device (air cylinder) 16 is operated, and the outer cover 17 is lifted from the position of the guide groove. ), from the time the tip of the rolled angle material reaches the rolling mill 18 until it is bitten by the rolls, it may be warped due to the impact when the rolls collide with the rolled material, or the roll may slip during biting. , an extremely slight but inevitable time lag will occur. For this reason, it is still 1
The rolled angle material 27 that is continuously sent out from the three-roll rolling mill 1 bends momentarily, but the guide groove has a bulge 25 (approximately L80m from the normal running position of the rolled angle material). (It is preferable to bulge out), the bending part is limited as shown by the dashed line in FIG. This will prevent any harm from occurring.

Therefore, the angle material to be rolled after being bitten by the next rolling mill 18 will protrude from the guide groove without any hindrance to form a loop, allowing smooth and stable continuous rolling.

Furthermore, even if the rolled angle material that is passing through the guide groove of the horizontally rotating repeater main body 13 is about to bend for some reason, the portion of the rolled angle material that was located in the bulged portion 25 The waist bend can be limited to
In addition, since the rolled angle material bulge detection device (limit switch) 26 is installed at a position close to the outer circumferential surface of the bulge portion 25, the outer cover 17t detects whether bending occurs at full speed.
- It becomes possible to release. Therefore, it is possible to quickly avoid a situation where the entire rolling operation has to be stopped.

In the embodiment described above, all of the twist rollers and the kite rollers of the horizontally rotating repeater main body 13 are non-driven, but for example, near the exit of the exit side twist guide 14, as shown in FIG. It is recommended to install a 29ft leveler type pinch roll.

In the pinch roll shown in FIG. 8, only the upper roll (preferably the upper roll is provided with grooves 14 as shown in FIG. 2(b)) is driven by a motor 29. This supplements the propulsive force of the rolled angle material, and since the edge angles (pin angles) of the rolled angle material are aligned, the material flow within the roll caliber can be reliably prevented from rising, and the tip crop of the rolled angle material can be prevented from bending. Correction is also possible.

As is clear from the above explanation, in the continuous angle rolling machine of the present invention, the angle bar to be rolled is introduced into the machine with the edge angle (pin angle) facing upward, which is the easiest to transport. Since the rolled material and the rolled product are delivered from the device in the same posture, special auxiliary equipment is not required for handling the rolled material and rolled product.

Although the present invention has been described above with reference to examples, these examples are merely illustrative of the present invention, and it is a matter of course that the scope of the present invention is not limited thereby.

Overall Effects> As described above, according to the present invention, it is now possible to perform continuous stand rolling of long angle materials using multiple rolling mills arranged in parallel, which was previously considered impossible, resulting in good quality. This brings about extremely excellent industrial effects, such as making it possible to provide highly efficient products.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the continuous angle rolling machine of the present invention. FIG. Figure 2 (a) is a schematic diagram of the entire structure, Figure 2 (b) is a bottom view of the main parts of the upper and lower pinch rolls, Figure 3 is a schematic diagram showing an example of the twist roller arrangement of the entry side twist guide. Fig. 4 is a schematic diagram showing an example of guide roller arrangement in the horizontally rotating repeater main body, Fig. 5 is a schematic diagram showing an example of the guide groove bulge portion of the horizontally rotating repeater main body, and Fig. 6 is a schematic diagram showing an example of the guide roller arrangement in the horizontally rotating repeater main body. FIG. 3 is a schematic diagram showing all examples of twist roller arrangement of the side twist guide. FIG. 7 is a schematic diagram for explaining the behavior of a rolled material in a vertically rotating repeater; FIG. 8 is a schematic diagram showing an example of a pinch roll suitable for application to the exit twist guide; FIG. 9 shows a conventional repeater used for continuous rolling in rolling mills arranged in parallel, and FIG. 7(a) is a schematic plan configuration diagram thereof;
FIG. 7(b) is a sectional view taken along the line AA in FIG. 4(a). In the drawings: 1...Three-roll rolling mill, 2...Entry side guide,
3...Vertical rotation repeater body. 4...Exit guide, 5...Inside, '7 bar, 6
... Attachment/detaching device, 7... Outer cover, 8...
Inner open opening, 9...pinch roll, 10...
Vertical holding plate, 11... Phototube device, 12... Inlet twist guide, 13... Horizontal rotation repeater body, 14... Outlet twist guide, 15... Inner cover, 16... Attachment/removal device, 17
...Outer cover, 18...Rolling machine, 19...
Air cylinder, 20...motor, 21...groove,
22...Twist roller, 23.24...
- Guide roller, 25... Swelling part, 26... Rolled angle material bulge detection device, 27... Rolled angle material, 28... Pinch roller, 29... Motor, 31...
- Bottom plate, 32...Inner wall, 33...Guide groove, 34...Outer wall, 35.36...Rolling mill. Figure 6 Difference 7

Claims (1)

[Scope of Claims] An exit side of a three-roll rolling mill that is provided with an entry side guide and a pinch roll for correcting the direction of biting of the rolled angle material into the rolling rolls on the side opposite to the supply side of the rolled angle material. An inner cover having a partially cut-out inlet end for defining an inner circumferential surface of a guide groove of the rolled angle material through a guide, and an inner cover that defines an outer circumferential surface of the guide groove and a detachable device. and an outer cover removably supported by the rolling mill, and the guide groove defined by the inner cover and the outer cover rotates around an axis parallel to the roll axis of the rolling mill and extends from the exit side of the rolling mill. A vertically rotating repeater main body is disposed, the end position of which forms a spiral arc-shaped curve deviated in the axial direction from that of the entry side end, and an inner open opening is formed by a notch of the inner cover. , on the rolled material delivery side of the three-roll rolling mill, and between the three-roll mill and the next rolling mill arranged in parallel, (a) the rolled material sent out from the three-roll mill; (b) an entry side twist guide having a guide path constituted by a plurality of twist rollers with gradually increasing inclinations for guiding the rolled angle material to the horizontally rotating repeater body while gradually twisting it; and (b) a guide groove. An inner cover for defining the inner circumferential surface and a plurality of guide rollers whose inclination gradually increases in succession with the inclination of the rolled angle material guide path of the input side twist guide are attached to the inner surface, and the cover is attached to the cover by an attaching/detaching device. The guide groove is formed by a removably supported outer cover for defining the outer circumferential surface of the guide groove, and the inlet end bulges in the outer circumferential direction, and a bulge of the rolled angle material is detected at a position near the outer circumferential surface of the bulged portion. (
c) Gradually tilting in continuation with the inclination of the guide roller of the horizontally rotating repeater main body to guide the rolled angle material, which is sent out with its running direction changed by the horizontally rotating repeater main body, to the next rolling mill while further twisting. and an exit twist guide having a guide path constituted by a plurality of twist rollers that increase the A horizontally rotating repeater is provided in which the inclination angles of the twist rollers of the entry side twist guide, the guide rollers of the repeater body, and the twist rollers of the exit side twist guide are adjusted so that the rolled angle material is twisted by an angle of 180 [degrees]. An angle material continuous rolling equipment characterized by the following: