JPH0618658B2 - Warpage prevention device for rolled material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a plate rolling mill, and more particularly to a suitable warpage preventing device for a rolled material on the rolling mill exit side of the rolling mill.

[Conventional technology]

In recent years, the demand for rolled clad steel sheets has been increasing, but since Kland steel sheets are rolled by combining dissimilar metals, the conventional rolling technology such as the temperature of the rolled material and the diameter difference between the upper and lower rolls It is difficult to prevent the warp, and when the number of rolling increases, the warp is promoted and the warp becomes large, so that the rolling becomes difficult. For this reason, there is a need for a device that applies downward bending force to the material that is rolled into upward warp to prevent upward warp. Further, when the rolled material warps in the rolling process by the rolling mill, the rolled material may enter between the table rollers and the like, which may hinder the operation of the rolling mill. So usually,
In the rolling process, the rolled material is rolled such that the tip of the rolled material is slightly warped. However, if the degree of warp is severe, for example, in a fully continuous hot strip mill, it becomes impossible to bit the rolled material into the next stand, which hinders the operation of the rolling mill. Therefore, a device for applying downward bending force to the warped rolled material to adjust the warped rolled material is required.

Conventionally, a means for preventing or adjusting the warp is to roll the rolled material from above and below by a pair of vertically movable rolls provided on the exit side of the rolling mill as seen in Japanese Patent Publication No. 65366/1974. It was something that could be pressed in as if it were sandwiched. According to this, it is possible to suppress the warpage of the rolled material so that the rolled material advances straight, and further, since the rolled material is supported by two points of the work roll and the pressing roll, the vertical deflection of the rolled material It can be rolled with nothing.

[Problems to be Solved by the Invention]

However, in the above-mentioned conventional warp prevention means, since the center of the pair of upper and lower presser rolls is on one vertical line to the surface of the rolled material, the presser roll only presses the rolled material, and The rolled material cannot be bent downward, and the warp of the rolled material cannot be appropriately prevented.

The present invention has been made in view of the above points, and an object thereof is to provide a rolled material with a bending caused by pressing by a pressing roller to prevent warpage of the rolled material after rolling, and to provide excellent rolling properties for the rolled material. An object of the present invention is to provide a device for preventing warpage of a rolled material that can provide the above.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, a pressing cylinder disposed on the exit side of a rolling mill, a pressing roller that moves up and down by the pressing cylinder, and a rolling material with the pressing roller are provided. In a warpage prevention device for a rolled material, which comprises a feed roller for pressing to prevent warpage, a surface of the rolled material that passes through the axis of the pressing roller and is perpendicular to the surface of the rolled material, and a feed roller at a position facing the pressing roller. Through the axis of the rolled material to a surface perpendicular to the surface of the rolled material, and the feed roller is closer to the work roll side of the rolling mill than the pressing roller. A detection device for detecting the position of the pressure sensor and a signal sent from the detection device to the pressure supply means so that the pressing roller presses the rolling material after the rolling material reaches below the pressing roller based on the signal. First The first arithmetic unit and the pressure supply means for supplying the pressure from the pressure source to the pressing cylinder by the signal from the first arithmetic unit.

Further, preferably, a pressing load detecting device for detecting a pressing load of a work roll of a rolling mill, and a signal of a detection value detected by the pressing load detecting device, and the pressing roller based on the detection value and an initial setting value. And a pressure control valve for controlling the pressure of the fluid sent from the pressure source to the pressing cylinder by receiving a signal of a calculation value from the second processing device. It is a thing.

Further, preferably, a pressing force detecting device for detecting the pressing force of the pressing roller, and a correction of the detected value and the pressing force calculated by the second arithmetic device upon receiving a detection value signal from the pressing force detecting device. A third arithmetic device for calculating a value, and an electric pressure conversion valve for adjusting a pressure of a fluid which is sent from the pressure source to the pressing cylinder and receives a signal of a correction value of the pressing force from the third arithmetic device. It is the one.

[Action]

That is, in the present invention, between the surface perpendicular to the surface of the rolled material passing through the axis of the pressing roller and the surface perpendicular to the surface of the rolled material passing through the axis of the feed roller in a position facing the pressing roller. By providing an arbitrary distance to and the feed roller being closer to the work roll side of the rolling mill than the pressing roller, the rolled material after rolling can be bent downward.

Further, by providing a detection device that detects the position of the tip of the rolled material and a first arithmetic device that sends a signal to the pressure supply means so as to press the pressing roller based on the signal of the detection device, rolling after rolling The rolled material can be bent downward from the leading end position of the material, and the rolled material can be provided with excellent stripability.

Further, a reduction load detecting device for detecting a reduction load of a work roll of a rolling mill, and a second arithmetic device for calculating a pressing force of a pressing roller based on a signal of a detection value detected by the reduction load detecting device and an initial setting value. Since it is possible to appropriately control the pressing force of the pressing roller according to the rolling load of the work roll, the type of rolled material, etc., the warp of the rolled material can be finely adjusted according to the type of rolled material. Further, it is possible to give the rolled material further excellent sheet passing property.

Further, a pressing force detecting device for detecting the pressing force of the pressing roller, and a correction value of the detected value and the pressing force calculated by the second calculating device, which receives a detection value signal from the pressing force detecting device, are calculated. By providing the third arithmetic unit for controlling the pressing roller, it is possible to ensure the control of the pressing roller, and it is possible to provide the rolled material with further excellent sheet passing property.

Example of Invention

Embodiments of the present invention will be described below with reference to the drawings. In the figure, 1 is a mill housing, 2 is a lower work roll assembly,
3 is an upper work roll assembly, and 4 is a reinforcing roll assembly. A pressing roller 14 is attached to the outer guide 13. One end of the outer guide 13 is supported by the outer guide frame 8 by a fulcrum pin 12, and one end of the pressing roller 14 is supported by a pressing cylinder 15 via a frame 16 attached to the housing. It is designed to operate freely. Further, below the pressing roller 14, a feed roller 10 for pressing the rolled material together with the pressing roller 14 is installed, and the center of the feed roller 10 is displaced from the center of the pressing roller as shown in FIG. Are offset so that there is. The load cell 1 is placed on the reinforcing roll 4.
8 is installed and the reduction load detected here is sent to the arithmetic unit I and the arithmetic unit II. A load cell 17 is installed between the outer guide 14 and the pressing cylinder 15, and the pressing force of the pressing roller 14 detected here is sent to the arithmetic unit III.

The pressing cylinder 15 has arithmetic units I, II, III, respectively.
It is operated by a hydraulic sequence composed of a switching valve 21 and electric pressure conversion valves 19 and 20 which are operated by a signal sent from.

Next, the operation during actual rolling in the apparatus configured as described above will be described.

When the rolled material reaches the work roll and starts rolling, the rolling load of the work roll rapidly increases. The increased rolling load is detected by the load cell 18 and sent to the arithmetic unit I. In the arithmetic unit I, pressing is performed based on the detection value sent from the load cell 18, the set values such as the work roll speed set in the arithmetic unit in advance, and the experimental data previously obtained by the timer built in the arithmetic unit I. Calculate that the roller should catch the tip of the rolled material and start pressing,
A signal is sent to the switching valve 21 based on the calculated value to start pressing the pressing roller via the cylinder 15. The pressing roller may catch the rear portion of the rolled material instead of the front end thereof, depending on the warp of the rolled material. In addition, when the pressing roller catches the tip of the rolled material, an optical sensor installed near the pressing roller directly detects that the rolled material is under the pressing roller and sends a signal to the switching valve. The pressing may be started.

As described above, according to the present invention, since the pressing roller and the feed roller are slightly offset from each other, the rolled material is bent, and a rolled material position detecting device or the like is provided. It can be given from the tip to give excellent rolling properties to the rolled material.

Further, in the present invention, when the rolling is started, the rolling load of the work roll is detected by the load cell 8 at every moment, and the detected value is sent to the arithmetic unit II. In the arithmetic unit II, the detected value sent by the load cell 8; Computation device II in advance
Based on the set value set in, the pressing force of the pressing roller is calculated so that the warp of the rolled material such as pressing with a stronger force when the plate thickness is thick can be appropriately prevented, and the electric pressure conversion valve is calculated based on the calculated value. A signal is sent to 20 to cause the pressing roller to press the rolled material through the cylinder 15. As for the pressing force of the pressing roller thus controlled, the actual pressing force is detected by the load cell 17, and the value is sent to the arithmetic unit III. The arithmetic unit III compares this detected value with the calculated pressing force of the arithmetic unit II, and the pressing force of the pressing roller is calculated by the arithmetic unit.
A correction value is calculated so as to obtain the pressing force calculated in II, the correction value is sent to the electric pressure conversion valve 20, and feedback control is performed so that the pressing force has a desired value.

Although three arithmetic units are used in the description of the above embodiments, the present invention can be implemented by using a program and performing arithmetic with one arithmetic unit for each arithmetic.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to provide an apparatus for preventing warpage of a rolled material that can prevent warpage of the rolled material after rolling and provide excellent rolling properties to the rolled material.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, and FIG. 1 shows a block diagram of a rolling mill equipped with the present invention. 1 ... Mill housing, 2 ... Lower work roll assembly, 3
…… Upper roll assembly, 4 …… Upper roll assembly, 5…
… Stripper guide, 6 …… Carrier beam, 7 ……
Reinforcing roll balance cylinder, 8 ... outer guide frame, 9 ... guide balance cylinder, 10 ... feed roller, 11 ... table roller, 12 ... fulcrum pin, 13 ... outer guide, 14 ... pressing roller, 16 ......
Claims, 17 ... load cell, 18 ... load cell,
19, 20 ... Electric pressure conversion valve, 20 ... Switching valve, 22
…… Bender cylinder, 23 …… Computing device.

Claims (3)

[Claims] 1. A rolled material, which is disposed on the delivery side of a rolling mill and comprises a pressing cylinder, a pressing roller that moves up and down by the pressing cylinder, and a feed roller that presses the rolled material together with the pressing roller to prevent warping. In the warp prevention device, between a surface that passes through the axis of the pressing roller and is perpendicular to the surface of the rolled material, and a surface that passes through the axis of the feed roller that is at a position facing the pressing roller and that is perpendicular to the surface of the rolled material. An arbitrary distance is provided, the feed roller is closer to the work roll side of the rolling mill than the pressing roller, and a detection device for detecting the position of the tip of the rolled material, and a signal for receiving the signal from the detection device After the rolled material reaches below the pressing roller based on the above, a first arithmetic unit for sending a signal to the pressure supply means so that the pressing roller presses the rolled material, and a signal from the first arithmetic unit Yo An apparatus for preventing warpage of a rolled material, comprising pressure supply means for supplying pressure from a pressure source to the pressing cylinder. 2. An apparatus for preventing warpage of a rolled material according to claim 1, wherein the rolling load detection device detects a rolling load of a work roll of a rolling mill, and the rolling load detection device detects the rolling load. A second arithmetic unit for receiving a signal of the detected value and computing the pressing force of the pressing roller based on the detected value and the initial set value; and a signal of the arithmetic value from the second arithmetic unit for receiving the signal of the pressure source from the pressure source. An apparatus for preventing warpage of a rolled material, comprising a pressure adjusting valve for adjusting the pressure of fluid sent to a pressing cylinder. 3. A warpage prevention device for a rolled material according to claim 2, further comprising a pressing force detection device for detecting a pressing force of the pressing roller,
A third arithmetic unit for receiving a detection value signal from the pressing force detector and calculating a correction value of the detected value and the pressing force calculated by the second arithmetic unit; and a pressing force from the third arithmetic unit. An apparatus for preventing warpage of a rolled material, comprising: an electric pressure conversion valve that receives the signal of the correction value from the pressure source and is sent from the pressure source to the pressing cylinder to adjust the pressure of the fluid.