JPH0215822A - Straightening apparatus for shape of hot rolled stock - Google Patents

Abstract

PURPOSE:To improve straightening accuracy and productivity of the rolled stock, by providing a straightening roll unit having plural straightening rolls and disposing an elevating device to elevate the straightening roll unit to the rolled stock. CONSTITUTION:A hydraulic cylinder 23 is provided on the upper end of a hausing 22, the upper straightening unit 24 is connected to the lower end of the cylinder 25. On the unit 24, plural upper straightening rolls 21A, 21B are disposed. When the front end of the rolled stock 3 arrives at the hausing 22 and if a warp is existing on the rolled stock 3, the roll unit 24 is released upward by the cylinder 23. Then, when the rolled stock 3 is carried in between the units 24, 25, the upper unit 24 is moved downward to straighten the warp. Because the warp of the rolled stock 3 is straightened surely by plural rolls and straightening work time is enabled shortening, the straightening accuracy and productivity of the rolled stock 3 is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a straightening device for hot-rolled material, and in particular, a straightening roll is rolled down on the hot-rolled material being conveyed to correct the defective shape of the hot-rolled material. The present invention relates to a straightening device for hot rolled material.

(Prior art) Generally, in hot rolling, heated
A slab with a thickness of 0.0 mm is rolled into 15 to 60 mm by a rough rolling mill.
The product is rolled into a thick hot-rolled material, which is then processed by a finishing mill.
Further rolling was performed until the required product thickness was achieved.

As the hot rolling equipment, there is one described in Japanese Patent Application No. 1982-209905, which was previously proposed by the applicant of the present invention. As shown in the side view of FIG. 7, this prior application includes a crop shear 4 for cutting the front and rear ends of the hot rolled material, and a crop shear 4 for cutting the front and rear ends of the hot rolled material between the rough rolling mill 1 and the finishing rolling mill 2. Pretreatment devices such as a high-strength water injection type descaling device 5 for removing scale and edge heaters 6 for compensating for the temperature drop at both ends of the rolled material 3 are arranged. The rolled material 3 is
It is configured to be transported on transport rolls 20 and transported to these pre-processing devices.

By the way, it is desirable that the hot-rolled material has a straight aroma in the conveying direction, but there are also differences in the temperature distribution between the upper and lower surfaces of the hot rolling material during rough rolling, and the friction conditions on the upper and lower surfaces between the rolling rolls and the rolled material. Due to the difference in the shape, an inevitable shape defect, ie, warpage, etc. occurs at the tip.

Such shape defects may also occur at the rear end and middle portion.

Therefore, the pre-processing device explained in FIG. 4, the rolled material 3 cannot enter the drum gap 7, resulting in poor cutting and cannot be fed to the finishing mill 2, so it is removed from the line.

In addition, in the descaling device 5, if the amount of warpage at the tip of the rolled material 3 exceeds a permissible value, contact with the high-pressure water injection nozzle 8 will occur, making it impossible to proceed. On the other hand, rolled material 3
Even if the amount of warpage at the tip is such that it does not come into contact with the high-pressure water injection nozzle 8, the distance between the high-pressure water injection nozzle 8 and the rolled material 3 changes compared to the normal case, resulting in a decrease in descaling ability. However, there is a problem in that the leading end of the rolled material 3 is overcooled.

Furthermore, the edge heater 6 usually has an induction heating coil placed close to the rolled material 3 and heats the rolled material 3 passing through by generating an induced current.
In order to prevent contact with the tip of the rolled material 3, the lower heating coils 6A, 16B are separated from the rolled material 3 until the tip passes, and then moved closer to the rolled material 3 after passing.

Here, the magnitude of the induced current generated by the induction heating coil is determined by the gap between the rolled material 3 and the heating coil, so the expected amount of warpage (allowable amount) of the tip of the rolled material 3 is small. Although it is possible to reduce the capacity of the edge heater 6 as much as possible, at present, the allowable value for the amount of warpage is set to be relatively large, so there is a problem that an edge heater with a large capacity must be used.

The above problem can be solved by correcting the warp at the tip of the rolled material 3 before sending it to the finishing mill. Therefore, conventionally, as shown in FIG. 8, a fixed guide 9 is provided on the exit side of the rough rolling mill 1, and the warpage at the tip of the rolled material 3 is corrected between the fixed guide 9 and the table roller 10. There is something I did.

[Problem to be solved by the invention]

However, in the shape straightening device for rolled material as shown in FIG. There is a problem that slips occur between the rollers and the rolled material is not conveyed.
The conventional example shown in FIG. 8 has a problem in that it is difficult to correct the warpage of the rolled material to a completely flat shape. Furthermore, in a known leveler having a pinch roller 90 for pushing the rolled material on the upstream side as shown in the side view of FIG. It takes a lot of energy to make it happen. For this reason, measures have been taken to place pinch rolls on the entry side of the leveler and forcibly push the plate through, but this also has its limits if the warpage is large, and the rolled material cannot pass through the leveler. There is a problem that the board is not bent and the back is bent.

On the other hand, it is also possible to solve the above-mentioned problem of passing the tip of the rolled material by rolling down the rolled material with a pair of upper and lower pinch rollers, conveying the rolled material in this state, and then feeding it back in the opposite direction to the conveying direction. Conceivable.

However, even with this device that uses pinch rollers, it is expected that it will be difficult to reliably correct the shape defects that occur in rolled materials, and the time required for the correction work will be long, which will reduce productivity. There is a problem with the decline.

In order to solve these problems, the present invention is capable of reliably correcting the shape defects without causing slip even if the degree of shape defects occurring in hot rolled materials is large, and at the same time, reduces productivity. It is an object of the present invention to provide a straightening device for correcting the shape of a hot rolled material.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a hot rolled material shape straightening device that straightens the shape of the rolled material by rolling the straightening roll down on the hot rolled material being conveyed. The present invention is characterized by comprising a plurality of straightening roll units and an elevating device that raises and lowers the straightening roll units relative to the rolled material.

[Effect]

According to the present invention, since the roll unit having a plurality of straightening rolls is used to roll down the hot-rolled material to be conveyed, it is possible to reliably correct the shape defect at the tip of the hot-rolled material, and Since the tip of the rolled material can be reliably passed through the straightening device, it is possible to straighten the shape over the entire length. Furthermore, since the time required for correction is short, productivity can also be improved.

〔Example〕

Next, an embodiment of the apparatus for straightening the shape of a hot rolled material according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view showing the configuration of one embodiment.

First, the configuration will be explained. The shape correction device according to this embodiment includes a housing 22 that can transport the rolled material 3 in the direction of the arrow. A lower straightening roll unit 25 is provided at the lower end of this housing. This lower straightening roll unit 25 includes two lower straightening rolls 20
It is equipped with A and 20B. This lower straightening roll 20A,
Reference numeral 20B denotes a conventional rolled material conveying roll, and since this lower straightening roll unit is fixed to the lower end of the housing 22, the lower straightening rolls 20A, 20B and the rolled material 3 are in constant contact. Conveyance rolls 20 are provided on the upstream and downstream sides of the housing 22 in the conveyance direction, respectively, and convey the rolled material 3 in the direction of the arrow.

A hydraulic cylinder 23 is provided at the upper end of the housing 22, and an upper straightening roll unit 24 is connected to the lower end of the hydraulic cylinder 23. This upper straightening roll unit includes two upper straightening rolls 21A and 21B.
is provided.

The hydraulic cylinder 23 controls the upper straightening roll 21A based on a control signal from a controller (not shown).

21B is rolled down to the rolled material 3.

Next, the operation of the above embodiment will be explained.

2 and 3 are side views showing the working process of correcting the shape of a rolled material having a warped tip using the apparatus of the embodiment shown in FIG. 1.

In FIG. 2, (1) is a case in which the rolled material 3 has an upward warp, and (2) is a case in which a downward warp exists in the rolled material 3.

When the rolled material 3 is transported and its leading end reaches the inside of the housing 22, the hydraulic cylinder 23 moves the upper straightening roll unit 24 upward based on a control signal from a higher-level controller. Therefore, depending on the amount of warpage at the tip of the rolled material 3, it is possible to prevent the tip from interfering with the upper straightening rolls 21A, 21B. Furthermore, if there is a downward warpage at the tip of the rolled material 3, the method shown in FIG. 2 (2) is similar to that shown in FIG. 2 (1).
As shown in the figure, by moving the upper straightening roll unit 24 upward, interference between the upper straightening rolls 21A, 21B and the tip of the rolled material 3 can be prevented.

Therefore, when correcting the warp at the leading end of the rolled material 3, first the upper straightening roll unit is moved upward and opened in accordance with the amount of warpage at the leading end of the rolled material 3.

Next, the rolled material 3 is further conveyed, as shown in FIG. The rolled material 3 is rolled down to the unit side.By conveying the rolled material 3 in this state, it is possible to correct a shape defect such as upward or downward curvature occurring at the tip of the rolled material 3.

According to the present embodiment, the rolled material 3 is transferred to the upper straightening roll 21.
By supporting and rolling down at two points A and 21B and conveying the rolled material 3 between the upper straightening roll and the lower straightening roll in the direction of the arrow, the energy for straightening the warp can be reliably transmitted. The warp at the tip of the rolled material can be reliably corrected, and at the same time, the rolled material can be easily passed through the straightening device. In other words, in order to correct the warpage at the tips of a pair of pinch rolls, it is necessary to open the space between the upper and lower rolls, sandwich the rolled material, and then transport the rolled material in the opposite direction. On the other hand, 1. According to this embodiment, since the tip warp correction and the sheet passing through the device are carried out at the same time, there is no need for conveyance in the opposite direction.Therefore, the time required for shape correction is shortened. Productivity will improve accordingly.

According to the present embodiment, the rolled material 3 is straightened into a flat shape by the straightening device, so the upper heating coil 6A and the lower heating coil 6B in the edge heater 6 are set to have a small gap with the rolled material 3 passing through. can do.

Therefore, by significantly reducing the capacity of these heating coils,
Equipment costs can be reduced.

Further, there is no need to make the upper heating coil 6A movable.

Further, in the crop shear 4 as well, since the tip of the rolled material 3 is straightened into a flat shape, the tip will not become impossible to cut.

Furthermore, in the descaling device 5, the straightened rolled material does not interfere with the high-pressure water injection nozzle 8;
Furthermore, since the distance between the high-pressure water injection nozzle 8 and the surface of the rolled material 3 is approximately constant, stable descaling can be performed and overcooling of the tip of the rolled material 3 can be prevented.

By installing the straightening device according to the present embodiment at the entrance side of a rolled material edge heater device, rough rolling mill, leveler, etc., it is possible to reliably correct the warpage of the tip of the rolled material. In addition, although the above-mentioned present example explained correction of the warpage that occurred at the tip of the rolled material 3, the present invention is not limited to this, and the rolled material 3 may be supported at two points, the upper straightening rolls 21A and 21B, and rolled down. If you transport it in the direction of the arrow,
It is possible to correct various shape defects such as warping at the rear end or middle part of the rolled material.

Next, a second embodiment of the present invention will be described.

FIG. 4 is a side view showing the configuration of the second embodiment.

This embodiment differs from the embodiment shown in FIG. 1 above in the following points. Upper straightening roll 21A, 2
In the center of 1B, there is a sprocket wheel 27.
These and the chain 26 form a sprocket chain hooking mechanism. In addition, the lower straightening roll unit 25 includes a - group lower straightening roll 2.
An OA is provided, and this lower correction roll 20A is
It is arranged so as to be in contact with the rolled material 3 between the upper straightening rolls 21A and 21B. That is, the upper straightening roll 21
A, 21B and the lower straightening roll 20A are arranged alternately. Further, a spindle shaft 30 is connected to the sprocket wheel formed on the upper straightening roll 21A, and a roll rotation amount detector 31 is provided at the tip of the spindle shaft 30.

Next, the operation of this embodiment will be explained.

FIGS. 5 and 6 are side views showing the work of correcting upward or downward curvature formed at the tip of the rolled material 3 in this embodiment. Of these, FIG. 5 shows the case of upward curvature, and FIG. 6 shows the case of downward curvature.

In Figure 5, when the tip of the rolled material 3 moves to the lower straightening roll unit and the upper straightening roll unit that has moved upward, the upper straightening roll moves downward as shown in Figure 5 (Figures 11 to (2)). Then, the upper straightening rolls 21A, 2
1B is rolled down to the rolled material 3.

In this embodiment, the rolled material 3 is rolled by an upper straightening roll 2IA,
Since it is supported at three locations in total, two locations on the lower straightening roll 21B and one location on the lower straightening roll 20A, the degree of correction of the warp at the tip is further improved compared to the embodiment shown in FIG. This is the same even when there is a downward curvature at the tip of the rolled material 3, as shown in FIG.

In addition, in this embodiment, since the sprocket chain mechanism is provided, the upper straightening rolls 21A and 21B rotate synchronously, and the roll rotation amount detector at the tip of the spindle shaft provided on the upper straightening roll 21A , the conveyance amount of the rolled material 3 in the longitudinal direction can be measured. In this way, by measuring the amount of conveyance of the rolled material 3,
The measurement signal is outputted to a higher-level controller, thereby making it possible to control edge heating, descaling, etc., as shown in FIG.

A detailed explanation of the roll rotation amount detector 31 is as follows. A reflective tape is attached to the surface of the roll rotation amount detector 31, and a reflective photoelectric converter is provided on the side facing the reflective tape.

As a result, a pulse signal corresponding to the rotation speed of the spindle shaft is outputted, and by counting this pulse signal by a higher-level controller, the length of the rolled material 3 in the longitudinal direction can be measured.

In this embodiment, the upper straightening rolls are 21A and 21.
Although two straightening rolls B are provided, the present invention is not limited to this, and three or more straightening rolls may also be used.

Moreover, the spindle shaft 30 and roll rotation amount detector 31 can be similarly provided in the first embodiment to measure the conveyance amount of the rolled material 3 in the longitudinal direction.

〔Effect of the invention〕

As explained above, according to the apparatus for straightening the shape of a hot rolled material according to the present invention, the rolled material is supported at a plurality of points and rolled down to correct the shape defect. can be reliably corrected. Moreover, since the energy required for straightening is large, the time required for straightening work can be shortened, and productivity can be improved.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the present invention showing the configuration of a straightening device for hot rolled material shape, FIGS. 2 and 3 are side views showing the steps of straightening work, and FIG. 5 and 6 are side views showing the contents of the straightening work of the embodiment shown in FIG. 4, and FIG. 7 shows a conventional hot rough rolling mill, an edge heater, FIG. 8 is a side view showing the arrangement of a crop shear, a descaling device, and a finishing mill; FIG. 8 is a side view of a conventional rolled material end warp straightening device; and FIG. 9 is a side view of a conventional leveler. In the figure, 3 is a hot rolled material, 20 is a conveyor roll, 21A, 2
1B is an upper straightening roll, 20A and 20B are lower straightening rolls, 22 is a housing, 23 is a hydraulic cylinder, 24 is an upper straightening roll unit, and 25 is a lower straightening roll unit.

Claims (1)

[Claims] A straightening device for the shape of a hot rolled material that straightens the shape of the rolled material by rolling down a straightening roll on the hot rolled material being conveyed, comprising: a straightening roll unit including a plurality of the straightening rolls, and the straightening roll. A straightening device for the shape of a hot rolled material, comprising a lifting device for raising and lowering a unit relative to the rolled material.