KR19990038857A - Hot Rolled Oil Flow Control Device and Method - Google Patents

Abstract

The present invention relates to a hot rolling rolling oil flow control device and method for adjusting the flow rate of the rolling oil at the time of hot hydraulic pressure in accordance with the performance values such as the rolling load at the time of rolling, thickness, width, material of the rolled material, and the like. Rolling load and speed of the rough mill so that the rolling process having the target thickness, width and temperature is outputted by the higher process computer which collects the rolling record data and instructs and manages the rolling schedule, and the rolling instruction and the rolling information transmitted from the higher process computer. A rough rolling setting model for setting a and a rolling load and speed of a finishing mill to output a rolled material having a target thickness, width, and temperature as a rolling instruction and rolling information transmitted from the upper process computer, and the rough rolling setting model. A filament rolling setting model for setting an initial rolling flow rate from a measured thickness, width, temperature, and material value of the rolled material operated by Programmable controller for directing the rotational speed of the oil supply pump by instructing the rotational speed of the oil supply pump with the rolling flow rate set from the static model, and calculating the rolling flow rate from the rolling load and the speed measured from the finishing mill during rolling; And a load cell for measuring the rolling load and the speed of the rolling mill and outputting the same to the programmer controller.

Description

Hot Rolled Oil Flow Control Device and Method

The present invention relates to hot oil rolling, and more particularly, to a rolling oil flow rate control apparatus for hot rolling, which adjusts the flow rate of rolling oil during hot hydraulic pressure according to the performance values such as the rolling load at the time of rolling, thickness, width and material of the rolling material, and the like. It is about a method.

Hot rolled oil is a rolling material sprayed onto the work roll to reduce the rolling load by reducing the coefficient of friction between the rolled material, that is, the steel plate and the work roll, during the rolling process. An oil film is formed on the surface of the work roll. As a result, the coefficient of friction between the steel sheet and the work roll, which is a rolled material, is reduced, thereby reducing the rolling load by moving a neutral point having the same work roll speed and rolling plate speed toward the outlet.

Fig. 1 is a block diagram showing a conventional rolling oil control apparatus for spraying and controlling rolling oil on a work roll for hot oil rolling. The upper process computer 11 for collecting and rolling information and rolling records to instruct and manage a rolling schedule. When the rolling instruction is dropped from the upper process computer 11 by setting the setting value of the finishing mill, that is, the rolling speed of the rolling mill, etc. so that the rolling material having passed through the finishing mill (not shown) has a target thickness, width, and shape. Programmable controller for controlling the rotational speed of the oil supply pump 14 so that the rolling mill setting model 12 for setting the rolling flow rate according to the size of the rolling material and the amount of rolling oil set from the finishing rolling setting model 12 are injected. (Hereinafter referred to as " PLC ") 13, an oil supply pump 14 which rotates at the rotational speed indicated by the PLC 13 to eject oil, and an oil discharged by the oil supply pump 14 To the mixer (16) to apply to the mixer 16, the mixer 16 to mix the oil and water flowing through the electromagnetic valve (15) to the header (17) and the rolling oil delivered from the mixer (16) A header 17 for injection is provided.

As shown in FIG. 2, when the rolling instruction is dropped from the upper process computer 11 (201), the rolling oil control apparatus sets the flow rate of the rolling oil for each roll material size in the finishing rolling setting model 12 ( 202, the PLC 13 instructs the rotational speed of the oil supply pump 14 so that the flow rate set in the finishing rolling setting model 12 is discharged (203), the rolling mill 18 in which the oil supply pump 14 rotates to operate. Spray rolling oil on the

As described above, in the conventional rolling oil control apparatus, the required flow rate is set constant depending on the type of the rolled material (thickness, width, steel grade), and the spraying continues at the set flow rate from the start of rolling to the type of rolling. However, since the thickness, width, temperature and speed of the rolled material change during rolling, there is a problem that the hydraulic rolling effect is insufficient at the same rolling flow rate as the initial stage because the rolling load changes accordingly, and the rolling process reduces the rolling load. Since the same rolling flow rate is used in the second half of the initial stage, there is a problem that the rolling oil is excessively used.

The present invention has been made to solve the problem of insufficient use of the rolling effect and the excessive use of the rolling oil caused by the appropriate flow control is not made according to the thickness, width, temperature and speed of the rolling material as described above, the purpose is to It is to provide an apparatus and a method for controlling the flow rate of hot rolled oil, which controls the spraying flow rate to be adjusted and sprayed according to the thickness, width, temperature decrease of the soft material, and the rolling load and speed change of the rolling mill.

As a means for achieving the object of the present invention as described above, the present invention is the oil supply pump for rotating the oil to discharge the oil, the electron valve conveying the oil discharged by the oil supply pump to the mixer and the oil and water transmitted through the electron valve In the apparatus for controlling the rolling flow rate of the hot oil rolling device comprising a mixer for mixing the mixture to pass to the header, and a header for injecting the rolling oil delivered from the mixer to the rolling mill and rolling mill,

An advanced process computer that collects rolling information and rolling performance data to instruct and manage a rolling schedule;

A rough rolling setting model for setting the rolling load and speed of the roughing mill so that a rolling material having a target thickness, width, and temperature is outputted by the rolling instruction and rolling information transmitted from the upper process computer;

The rolling load and speed of the finishing mill are set so that the rolling material having a target thickness, width, and temperature is outputted by the rolling instruction and rolling information transmitted from the upper process computer, and the actual thickness of the rolling material operated by the rough rolling setting model. A filament rolling setting model for setting the initial rolling flow rate from the width, temperature, and material value;

Programmable controller for instructing the rotational speed of the oil supply pump by instructing the rotational speed of the oil supply pump with the rolling flow rate set from the finishing rolling setting model, and calculating the rolling flow rate from the rolling load and the speed measured from the finishing mill during rolling. Wow,

And a load cell for measuring the rolling load and speed of the finishing mill and outputting the same to the programmer controller.

As another means for achieving the object of the present invention as described above, the present invention is a method for controlling the rolling flow rate is injected into the finishing mill of the hot rolling step of roughly rolling the rolled material first and then second rolling.

Checking whether the rolling oil is used, and if the rolling oil is used, checking whether the rolling material is being rolled at the present time;

Calculating the initial flow rate setting value at the time of finishing rolling from the initial flow rate value set to the temperature, thickness, width, material, and size of the rolled material of the roughly rolled rolling material, if the current rolling material is not in the finishing rolling process. Wow,

In the above step, if the rolling material is currently being subjected to finishing rolling, it is checked whether or not the performance data including the rolling load, rolling speed and friction coefficient at the finishing rolling are input, and if not, calculating in the initial flow rate calculation step. Storing the initial flow rate setting value, the initial rolling load, the rolling speed and the friction coefficient, spraying the rolling oil at the initial flow rate setting value, and collecting the performance data;

When the performance data is input in the step, the difference between the stored rolling load, rolling speed and friction coefficient value and the measured value is calculated, the variation amount is calculated, and the rolling flow rate set value adjusted from the variation value is calculated, and the adjusted After spraying the rolling oil to the rolling flow rate set value, and collecting the performance data.

1 is a block diagram showing a rolling oil control apparatus in the prior hot rolling.

FIG. 2 is a flowchart showing a control flow of the rolling oil control device shown in FIG.

3 is a block diagram showing a rolling oil flow rate control apparatus of hot rolling according to the present invention.

FIG. 4 is a flowchart schematically showing the operation flow of the rolling oil flow control device shown in FIG.

FIG. 5 is a flowchart showing the schematic control flow of FIG. 4 in more detail.

6 is a graph for showing the effect of using the rolling flow rate adjusted by the present invention.

* Description of the symbols for the main parts of the drawings *

31: upper process computer 32: rough rolling setting model

33: finishing rolling setting model 34: programmable logic controller

35: oil supply pump 36: electronic valve

37 mixer 38 header of injector

39: finishing mill 40: rolled material

41: load cell

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the present invention.

Fig. 3 is a block diagram showing a hot rolling rolling flow rate control device according to the present invention, which comprises a higher process computer 31 for instructing and managing a rolling schedule by collecting rolling information and rolling record data of a rolling process; Rough rolling setting model 32 for setting rolling amount, rolling speed and rolling load of each rolling mill of roughing mill so that rolling material which received rolling information from upper process computer 31 and passed rough rolling has target thickness, width and temperature. And receiving the rolling information from the upper process computer and setting the finishing mills so that the rolling material passing through the finishing mill has the target thickness, width, and shape, and the temperature, thickness, width, material, etc. of the rolling material passing through the roughing mill. Initial rolling speed setting model 33 which sets the initial rolling flow volume in a finishing mill by actual value, and the rolling speed of the oil feed pump 35 by the rolling flow volume set by the said finishing rolling setting model 33. PLC 34, which instructs and corrects the rotational speed of the oil feed pump 35 by repeatedly calculating the rolling flow rate changed from the rolling load and the rolling speed measured from the finishing mill after the instruction, and the rotational speed instructed from the PLC 34 The oil supply pump 35 which rotates as it discharges oil, the electron valve 36 which applies the oil discharged by the oil supply pump 35 to the mixer 37, and the oil and water transmitted through the said electron valve 36 And a header (38) for spraying the rolling oil output from the mixer (37) to the finishing mill (39), and a load cell (41) for detecting the rolling load of the finishing mill (39). In the above description, 39 is a rolling mill and 40 is a rolling material.

Figure 4 is a flow chart showing a method of adjusting the rolling flow rate according to the thickness, width, temperature, and material change of the rolling material according to the present invention, with reference to the rolling oil flow rate control device shown in Figure 3 to explain the operation Is as follows.

First, when the rolling start is instructed together with the rolling information (type of the rolled material and the target value after rolling, etc.) collected by the upper step computer 31 (401), first, in the rough rolling setting model 32, the upper step computer On the basis of the rolling information applied from (31), the rolling load and speed of the roughing mill are set such that the rolling material having passed the roughing mill has a target thickness, width, temperature, and material.

At this time, the actual value of the rolled material passing through the roughing mill operating according to the setting of the rough rolling setting model 32, that is, the temperature (RT), thickness (T), width (W), material ( C) is collected and transferred to the finishing rolling setting model 33 together with the finishing rolling instruction from the upper process computer 31 (402). Accordingly, in the finishing rolling setting model 33, the load and speed of the finishing mill are set so that the rolled material rolled by the finishing mill has a target thickness, temperature, and material, and the actual measured value (that is, the performance value) is From the temperature (RT), thickness (T), width (W) and material (C) of the rough rolled rolling material, the flow rate (Q) of the rolling oil to be sprayed onto the work roll of the finishing mill is set. Same as 1.

Flow rate Q = f (RT, T, W, C, I) = a1 × RT + a2 × T + a3 × W + a4 × C + I

In Equation 1, a1, a2, a3, and a4 are constants, and I represents an initial flow rate value according to the type of rolling material set in the finishing rolling setting model 33. That is, the rolling flow rate is set in the conventional rolling setting model 12 which is injected from the start to the end of conventional finishing rolling. In the actual process, for example, the temperature RT is about 900 to 1100 degrees, the thickness T is about 20 to 70 mm, the width W is about 700 to 1800 mm, and the material C is about 0.002 to about The carbon content value is 0.85% and the initial flow rate value I is about 0.1 to 0.6 l / min (403).

In this way, the flow rate Q value set in the finishing rolling setting model 33 is transmitted to the programmable logic controller 34, and the programmatic logic controller 34 is connected to the flow rate Q set in the finishing rolling setting model 33. A corresponding rotational speed is instructed to the oil supply pump 35, and the oil derived by operating the oil supply pump 35 at the rotational speed is transmitted to the mixer 37 through the electromagnetic valve 36, mixed with water, and then the header. 404 is injected into the finishing mill 39 through 38.

At this time, the rolling load (RF) and the rolling speed (V) at the time of finishing rolling are measured by the load cell 41 mounted on the finishing mill 39 being rolled and outputted to the PLC 34 (405). 34) recalculates the flow rate Q 'from the rolling load RF and the rolling speed V, which are measured values during the finishing rolling, and the frictional coefficient µ flowing out therefrom. The equation for calculating the flow rate (Q ') at this time is as shown in Equation 2.

Flow rate (Q ′) = f (RF, V, μ, I) = a5 × RF + a6 × V + μ + I

In the above, a5, a6 is a constant, for example in the actual rolling process, the rolling load RF is in the range of 400 to 4000 tons, the rolling speed V is a value of 300 to 1500 MPM, the friction coefficient μ is 0.1 The initial flow rate value I is 0.1 to 0.6 l / min as described above (406).

The PLC 34 instructs the rotational speed of the oil feed pump 35 to the rolling flow rate Q 'recalculated by Equation 2.

The steps 404, 405 and 406 are repeated during finishing rolling in which the rolling oil is injected, so that the flow rate of the rolling oil is appropriately adjusted according to the rolling load and the rolling speed change.

The above-described hot rolling rolling flow rate control method is collectively arranged with reference to the flowchart shown in FIG.

First, it is determined whether the rolling oil is used (501). If the rolling oil is not used, the rolling oil flow rate control is not necessary, and if the rolling oil is used, it is checked whether the rolling oil is being rolled by the finishing mill (502). At this time, if it is not during the rolling operation, it is determined that the finishing rolling operation is started, and thus, the rolling value of the rolling oil is calculated by the formula shown in Equation 1 from the rolling value, thickness, and width of the rolling material passing through the rough rolling mill. After setting the flow rate (503), the process proceeds to step 503 to determine whether or not the end of the rolling process, and if it is currently rolling in the step 502, it is checked whether the rolling record data has been input (504). Here, if the rolling record data is not input, after storing the initial flow rate set value and the rolling load, rolling speed, friction coefficient, and the like set by Equation 1 (505), the oil supply pump 35 to the initial flow rate set value (506). When the rolling oil is provided as the rotational speed instruction and rolling is performed, the rolling record data (rolling load, rolling speed, etc.) is collected, and then the process proceeds to the end checking step 503. On the contrary, when the performance data is input in the rolling record data input check step 504, the difference between the variation of the rolling load, that is, the difference between the initial rolling load memorized in the step 505 and the measured rolling load is calculated (507). The variation of the rolling speed, that is, the difference between the initial rolling speed stored in the step 505 and the measured data is calculated (508), and the friction coefficient variation, ie, the difference between the measured initial friction coefficient and the measured data stored in the step 505 is calculated. (507), and calculates the rolling flow rate correction value by substituting the calculated variation of the rolling load, the rolling speed variation, and the friction coefficient variation into Equation 2 (510), and the oil supply pump (from the calculated rolling flow rate correction value). The rotational speed of 35 is instructed to be corrected (511), and the performance data of the rolling made of the rolling oil of the corrected flow rate is collected (512), and the process proceeds to step 513 of checking whether the rolling is finished. In step 513 of checking whether this is finished, it is determined whether or not it is finished. If the rolling process is not finished, the process returns to step 502 to determine whether the rolling is in progress. When the rolling process is finished, the rolling oil flow rate control operation is performed. Quit.

Fig. 6 is a graph showing the actual measurement of the rolling load when the rolling flow rate is controlled as described above and the rolling load when the rolling oil is not used (that is, without hydraulic rolling) and the rolling load when a certain amount of rolling oil is used. As shown in the graph, it can be seen that the rolling load in the case of adjusting the flow rate as in the present invention is low overall.

As described above, the present invention has the effect of setting the rolling flow rate from the result of rough rolling, which is the pre-process of finishing rolling in early finishing rolling, and spraying the optimum rolling flow rate according to the state of the rolling material. By adjusting or adjusting the initially set rolling flow rate in accordance with the change of the rolling load and the rolling speed represented by the change in thickness, width and temperature, it is possible to prevent unnecessary consumption of the rolling flow rate and to always inject the appropriate rolling flow rate, thereby rolling the load. By reducing the rolling power and reducing the power will have the excellent effect to maximize the effect of the hydraulic roll.

Claims (2)

A fueling pump for rotating oil to discharge oil, an electric valve conveying oil discharged by the oil supply pump to the mixer, a mixer mixing oil and water transmitted through the electron valve and conveying it to the header, and rolling oil delivered from the mixer to the rolling mill In the device for controlling the rolling flow rate of the hot oil rolling device having a header to be rolled and rolling mill, An advanced process computer that collects rolling information and rolling performance data to instruct and manage a rolling schedule; A rough rolling setting model for setting the rolling load and speed of the roughing mill so that a rolling material having a target thickness, width, and temperature is outputted by the rolling instruction and rolling information transmitted from the upper process computer; The rolling load and speed of the finishing mill are set so that the rolling material having a target thickness, width, and temperature is outputted by the rolling instruction and rolling information transmitted from the upper process computer, and the actual thickness of the rolling material operated by the rough rolling setting model. A filament rolling setting model for setting the initial rolling flow rate from the width, temperature, and material value; Programmable controller for instructing the rotational speed of the oil supply pump by instructing the rotational speed of the oil supply pump with the rolling flow rate set from the finishing rolling setting model, and calculating the rolling flow rate from the rolling load and the speed measured from the finishing mill during rolling. Wow, Hot rolling mill flow control device characterized in that it comprises a load cell for measuring the rolling load and speed of the finishing mill, and outputs it to the programmer controller. In the method of controlling the rolling flow rate injected into the finishing mill of the hot rolling process of roughly rolling the rolled material first and then finishing the second rolling, Checking whether the rolling oil is used, and if the rolling oil is used, checking whether the rolling material is being rolled at the present time; Calculating the initial flow rate setting value at the time of finishing rolling from the initial flow rate value set to the temperature, thickness, width, material, and size of the rolled material of the roughly rolled rolling material, if the current rolling material is not in the finishing rolling process. Wow, In the above step, if the rolling material is currently being subjected to finishing rolling, it is checked whether or not the performance data including the rolling load, rolling speed and friction coefficient at the finishing rolling are input, and if not, calculating in the initial flow rate calculation step. Storing the initial flow rate setting value, the initial rolling load, the rolling speed and the friction coefficient, spraying the rolling oil at the initial flow rate setting value, and collecting the performance data; When the performance data is input in the step, the difference between the stored rolling load, rolling speed and friction coefficient value and the measured value is calculated, the variation amount is calculated, and the rolling flow rate set value adjusted from the variation value is calculated, and the adjusted Hot-rolled rolling oil flow control method comprising the step of collecting the performance data after the injection of the rolling oil to the rolling flow rate set value.