KR20130011736A - Apparatus for setting cutting speed and method for operating the same - Google Patents

Abstract

PURPOSE: A cutting rate setting apparatus and an operation method thereof are provided to improve work productivity automatically setting a cutting rate which cuts main piece which is continuously casted. CONSTITUTION: A cutting rate setting apparatus comprises a cutting rate-determining variable measuring unit(220), an input display part(240), and a cutting rate setting part(210). The cutting rate-determining variable measuring unit measures the cutting rate-determining variable from a main piece which is continuously welded. The input display part displays the value of the variable and includes input icons for automatic setting the cutting rate. The cutting rate setting part calculates the cutting rates according to the variable and sets the calculated cutting rate into an operation cutting rate of a main piece cutting apparatus. [Reference numerals] (210) Cutting rate setting part; (220) Cutting rate-determining variable measuring unit; (221) Carbon measuring unit; (222) Thickness measuring unit; (223) Temperature measuring unit; (230) Weighted value DB; (240) Input display part

Description

Apparatus for setting cutting speed and method for operating the same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting speed setting device and an operating method, and more particularly, to an apparatus and a setting method for setting a cutting speed of a cutting device for cutting a cast piece continuously.

The continuous casting process of slabs is performed by using ladle, tundish and cutting equipment. The molten steel formed in the steelmaking process is cast through ladle, tundish and cutting equipment. Slabs of 150-300 mm thickness are produced. Thereafter, by hot rolling, which is a subsequent process, a strip having a thickness of about 3 to 20 mm is manufactured.

The cast steel continuously cast through the tundish is continuously manufactured while moving between the up and down feed rollers to which the coolant is injected, and then cut into a predetermined length by a cutting facility as described in Korean Patent Laid-Open Publication No. 2005-0063928 and Transported to the garage.

As described above, the cast continuously cast, the primary cut is made, the primary cut is secondary cut to the appropriate length to meet the needs of the consumer. Such secondary cutting is caused by various thicknesses (220mm ~ 300mm) according to the cast casting type and many temperature variations (0 ℃ ~ 800 ℃) according to the cooling period of the casting. Should be judged and adjusted.

This task is cumbersome for the operator to adjust the speed according to the properties of the cast steel. In addition, as shown in FIG. 1, if the speed is set faster than the proper speed, there is a problem that the cut surface becomes poor due to uncut. On the contrary, if it is slower than the proper speed, there is a problem not only in cast quality due to excessive melt but also inferior in cutting efficiency. In other words, the cutting speed should be set according to the thickness, temperature, and steel grade, so that the cutting speed must be set before the worker starts cutting. There is a problem of poor product quality as well as poor product quality due to different cutting speed settings.

In addition, although the cutting speed should be different according to the carbon content of the cast steel, in practice, the carbon content of the cast steel cannot be grasped by the naked eye, and the carbon content factor does not affect the setting of the cutting speed.

The technical problem of the present invention is to automatically set the cutting speed of the cutting device for cutting the casting continuously cast. In addition, the technical problem of the present invention is to set the cutting speed to prevent the cast quality defects. In addition, the technical problem of the present invention is to provide an equation for calculating the cutting speed set according to the thickness, temperature, carbon content of the cast steel.

A cutting speed setting device according to an embodiment of the present invention includes a cutting speed determining variable measuring unit for measuring a cutting speed determining variable, which is a variable for determining a cutting speed of a cast steel, from a continuously cast steel slab, and a value of the measured cutting speed determining variable. And an input display unit having an automatic cutting speed setting input icon and a click of the automatic cutting speed setting input icon, and calculating the calculated cutting speed differently according to the value of the measured cutting speed determining parameter. And a cutting speed setting unit for setting the calculated cutting speed to an operating cutting speed of the slab cutting device.

In the cutting speed setting method according to the embodiment of the present invention, the cutting speed determining variable, which is a variable for determining the cutting speed of the cast steel, is measured from the continuously cast steel slab, and the calculated cutting speed is determined according to the value of the measured cutting speed determining variable. And calculating a different cutting speed, and setting the calculated cutting speed to an operating cutting speed of the slab cutting device.

C is the carbon value contained in the cast steel, H is the thickness value of the cast steel, T is the temperature value of the cast steel, the reference cutting speed is the reference cutting speed value, the carbon parameter is the carbon value to convert the carbon value to the cutting speed When the parameter value to be multiplied, the thickness parameter is a parameter value to be multiplied by the thickness value to convert the thickness value to the cutting speed, the temperature parameter is a parameter value to be multiplied by the temperature value to convert the temperature value to the cutting speed, Cutting speed = Reference cutting speed-(Carbon parameter x C)-(Thickness parameter x H)-(Temperature parameter x C)

The weighted cutting speed = {reference cutting speed-(carbon parameters x C)-(thickness parameters x H)-(temperature parameters x C)} x is calculated by weight.

According to the embodiment of the present invention, it is possible to automatically set the cutting speed for cutting the cast continuously cast, it is possible to reduce the work load of the operator and improve the work efficiency. In addition, by calculating the cutting speed through the formula rather than the cutting speed set by the operator, it is possible to produce a quality cast. In addition, when calculating the slab cutting speed, not only the thickness and temperature of the slab but also the amount of carbon contained in the slab is taken into consideration, so that the precise slab cutting speed can be calculated. In addition, it can be cut at the calculated proper speed, it is possible to prevent the occurrence of poor cast quality.

1 is a photograph showing the cast failure caused by the wrong cutting speed of the operator.
Figure 2 is a perspective view showing a cast steel manufacturing process for producing a cast according to an embodiment of the present invention.
3 is a block diagram illustrating a cutting speed setting device for cutting a cast steel according to an exemplary embodiment of the present invention.
4 is a diagram illustrating an input display unit according to an exemplary embodiment of the present invention.
5 is a diagram illustrating a weight database according to an embodiment of the present invention.
6 is a flowchart illustrating a process of calculating a cutting speed for cutting a continuously cast cast piece according to an embodiment of the present invention.
7 is a diagram illustrating an example of improved data as a result of calculating and applying a cutting speed according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in more detail. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you. Wherein like reference numerals refer to like elements throughout.

Figure 2 is a perspective view showing a cast steel manufacturing process for producing a cast according to an embodiment of the present invention.

The ladle 120 installed in the ladle turret fills the molten steel with impurities removed and chemical composition and is supplied to the tundish 110 through the ladle nozzle 122 provided in the ladle 120. Done.

The molten steel stored in the tundish 110 is supplied to the mold 140 through an immersion nozzle 130 made of a cylindrical refractory brick, and then passes through an inner space of the mold 140 having long and short sides. Cast slabs 150 having the same cross section as the cross section of the mold are continuously cast.

In the mold 140, a dummy bar 160 that guides the cast 150 to be drawn out enters an open lower portion of the mold 140, and the first molten steel introduced into the mold 140 is a dummy bar head. The uneven portion of 170 is solidified at the boundary. The solidified molten steel is continuously manufactured as the cast steel 150 while moving between the feed rollers which are pulled up and down by the dummy bar 160 and the coolant is sprayed as the plurality of feed rollers 180 installed in the moving track are driven.

The conveying roller is positioned above and below to convey the cast pieces 150 in between. The body portion of the feed roller is made of the same length and diameter, the shaft of the plurality of feed rollers 180 is connected to the bearing block is set and driven.

The cast steel 150 conveyed along the conveying roller 180 placed up and down is cut into a predetermined length by the slab cutting device 190 disposed on the outlet side, and is transferred to the hot rolling process by the table roller 182. do.

Cooling water is injected at the time of conveying along the feed roller 180, which is forcibly cooled by using the cooling water to solidify quickly and uniformly from the outside into a predetermined cross-sectional size. Therefore, when the cast steel from the mold 140 is transported along the feed roller 180, the cooling water is sprayed on the surface of the cast steel to quickly solidify the cast steel 150 around the feed roller.

On the other hand, the slab cutting device 190 disposed on the exit side cuts the slab 150 that has been conveyed along the feed roller 180 to a predetermined length, at this time the cutting speed (hereinafter, the operation cutting speed of the cutting device) ) Is determined by the cutting speed (hereinafter referred to as the calculated cutting speed) calculated by the cutting speed setting device 200. The operation cutting speed may be arbitrarily set by the operator, but in the embodiment of the present invention, the cutting speed setting apparatus 200 calculates the cutting speed according to the cutting speed determining variable including the carbon value, the thickness value, and the temperature value of the cast steel. The cutting speed is set to the operation cutting speed of the cutting device. That is, the cutting speed setting device 200 determines the cutting speed according to the cutting speed determining variable and adjusts the cutting speed of the cutting device by varying the driving power provided to the cutting device accordingly.

3 is a block diagram illustrating a cutting speed setting device for cutting a cast steel according to an exemplary embodiment of the present invention.

Hot rolled and thick plates are produced in the factory, and in particular, thick plates are cast in a continuous cast of various thicknesses according to the needs of the consumer. In addition, the continuous cast is produced by varying the temperature in accordance with the demand of the consumer, such as hot cast, cold cast. In addition, continuous cast steels with varying carbon content are produced according to consumer demand. As described above, continuous cast steels having different thicknesses, temperatures, and carbon values should be cut into cast steels at different cutting speeds.

The cutting speed setting device 200 for setting the cutting speed includes a cutting speed determination variable measuring unit 220, an input display unit 240, a cutting speed setting unit 210, and a weight database 230.

The cutting speed determining variable measuring unit 220 includes a carbon measuring unit 221, a thickness measuring unit 222, and a temperature measuring unit 223. Since the amount of carbon contained in the slab, the thickness of the slab, and the temperature of the cooled slab are different according to the request of the consumer, the cutting speed determining parameter measuring unit measures the carbon, thickness, and temperature of the slab to be cut.

The carbon measuring unit 221 is a sensing unit for measuring the amount of carbon contained in the cast steel, it is possible to determine by measuring the carbon content of the molten steel contained in the ladle before the cast steel is manufactured. Alternatively, the molten steel just before the cast steel is made by heating the raw material, the carbon content of the raw material is measured, and the measured value can be regarded as the carbon content of the cast steel.

The thickness measuring unit 222 is a sensing unit for measuring the thickness of the cast steel, and measures the thickness of the cast steel conveyed along the roller. As a method of measuring the thickness, the light is emitted at a height of the side of the slab through a coupler made of a light emitting element and a light receiving element to determine whether the emitted light is received. From the time point at which the light is not received, the height point may be determined as the thickness. Alternatively, the thickness of the cast steel may be measured using a separate measuring means.

The temperature measuring unit 223 is a sensing unit measuring the temperature of the cast steel. The temperature deviation (0 ℃ ~ 800 ℃) occurs depending on the cooling period of the cast steel, it is to measure the temperature of the cast steel that varies depending on the cooling period. The slab temperature measuring method may be made by various measuring methods such as a light emitting temperature sensor.

The input display unit 240 is a touch panel that can be input like a touch screen and displays a value of a cutting speed determination variable including carbon, thickness, and temperature to be measured. In addition, the input display unit 240 includes an automatic cutting speed setting input icon 242 and a cutting speed manual setting input icon 241 as shown in FIG. 4. That is, the cutting speed automatic setting input icon 242 is provided, and when the administrator clicks the cutting speed automatic setting input icon 242, the calculated cutting speed is calculated according to the measured carbon, thickness, and temperature values. (244). In addition, the actual speed that is currently being cut is displayed on the cut actual speed window 243 so that the administrator can know it. In addition, when the administrator clicks the cutting speed manual setting input icon 241, the cutting speed setting value is input from the manager through the setting cutting speed window 244. In addition, the input display unit 240 includes a speed fine adjustment bar 245 so that the cutting speed can be adjusted step by step while cutting is being performed.

The cutting speed setting unit 210 measures the cutting speed determining variable including the measured carbon, temperature, and thickness, calculates the calculated cutting speed for the continuous cast steel according to the measured value, and calculates the calculated cutting speed of the cast steel cutting device. Set to the cutting speed to operate.

The calculated cutting speed is calculated by the following [formula 1].

[Formula 1]

Output Cutting Speed = Reference Cutting Speed-(Carbon Parameters × C)-(Thickness Parameters × H)-(Temperature Parameters × C)

          = 511-(1.43 x C)-(1.10 x H)-(0.222 x T)

In the above, C is the carbon value contained in the cast steel, H is the thickness value of the height of the cast steel, T is the temperature value of the cast steel, the reference cutting speed is the reference cutting speed value, the carbon parameter to convert the carbon value to the cutting speed The parameter value multiplied by the carbon value, the thickness parameter is the parameter value multiplied by the thickness value to convert the thickness value to the cutting speed, and the temperature parameter is the parameter value multiplied by the temperature value to convert the temperature value to the cutting speed.

The reference cutting speed is a value that can be changed by the administrator as a reference value to be set, and can be obtained as an experimental result. The reference cutting speed is preferably 511.

The carbon parameter, the thickness parameter, and the temperature parameter are values determined and set by an experiment. Preferably, the carbon parameter is 1.43, the thickness parameter is 1.10, and the temperature parameter is 0.222.

Meanwhile, the calculated cutting speed calculated by the above [Equation 1] may be calculated as a weighted cutting speed to which a weight is additionally applied according to the condition of the cast steel. That is, the cutting speed setting unit may calculate the weighted cutting speed by further multiplying the weight with the calculated cutting speed obtained by carbon, thickness, and temperature as described in the following [Formula 2].

[Formula 2]

Weighted Cutting Speed = {Standard Cutting Speed-(Carbon Parameters × C)-(Thickness Parameters × H)-(Temperature Parameters × C)} × Weight

          = (511-(1.43 x C)-(1.10 x H)-(0.222 x T)} × weight

The weight has a value ranging from 0.5 to 1 (50% to 100%), which is stored in the weight database 230 for each cutting speed determining variable. FIG. 5 is a diagram illustrating a weighting database. As shown in FIG. 5 (a), it can be seen that carbon weights vary according to carbon content, thickness weights vary according to thickness, and temperature weights vary according to temperature. It can be seen that.

The cutting speed setting unit selects a weight of the cutting speed determining variable according to the state of the cast steel and applies it to [Equation 2]. For example, when the current cast temperature is 400 ° C., and the weight is applied according to the temperature, when the temperature weight is 400% at 400 ° C. as shown in FIG. 5C, the weight is 0.93 in Equation 2 above. Calculate the weighted cutting speed by applying. In addition, when the current carbon amount is 5% to 10%, and the weighting amount according to the carbon amount is to be applied, the carbon weight when the carbon amount is 5% to 10% shown in FIG. In Equation 2, the weighted cutting speed is calculated by applying a weight of 0.95.

In the application, whether the weight is applied to the carbon weight, the thickness weight, or the temperature weight is selected by the manager in accordance with the condition of the continuously cast slab and inputted to the cutting speed setting unit. For example, when the administrator inputs to apply the carbon weight, the cutting speed setting unit extracts the carbon weight according to the amount of carbon currently contained in the cast steel, and then applies it to [Equation 2] to calculate the weighted cutting speed.

Meanwhile, the weight may be selected from one of carbon weight, thickness weight, and temperature weight, but may be applied as an average value employing all three weights. For example, the weight can be applied as an average value obtained by {(carbon weight + thickness weight + temperature weight) ÷ 3}.

6 is a flowchart illustrating a process of calculating a cutting speed for cutting a continuously cast cast piece according to an embodiment of the present invention.

First, it has a process of measuring the cutting speed determination parameters of the continuously cast cast steel that is carried on the roller (S61). The cutting speed determining parameter is a factor including carbon, thickness, temperature, and the like, and is a measurement variable value used when determining the cutting speed. The carbon refers to the amount of carbon contained in the cast steel, and measures the carbon amount of the raw material used in making molten steel or the carbon amount of continuously cast molten steel or the carbon amount of continuously cast steel. The temperature and thickness refer to the temperature and thickness of the continuously cast slab produced through the mold in molten steel, and measures the temperature and thickness of the slab continuously cast flowing along the roller.

Thereafter, a process of extracting weights is performed (S62). The weight has a value ranging from 0.5 to 1 (50% to 100%), which is stored in the weighting database for each cutting speed determining variable and extracted from the weighting database. FIG. 5 is a diagram illustrating a weighting database. As shown in FIG. 5 (a), it can be seen that carbon weights vary according to carbon content, thickness weights vary according to thickness, and temperature weights vary according to temperature. It can be seen that.

After obtaining the cutting speed determining variable and the weight as described above, the cutting speed determining variable is applied to the above [Equation 1] to calculate the calculated cutting speed. Alternatively, the cutting speed determining variable and the weight are applied to the above [Equation 2] to calculate the weighted cutting speed (S63).

At the calculated cutting speed calculated by the above [Equation 1] is set to the operating cutting speed of the slab cutting device (S64), the cast steel that is continuously cast on the roller is cut as the set cutting speed. Alternatively, the operation cutting speed of the slab cutting device is set at the weighted cutting speed calculated by the above [Equation 2] (S64), and the continuous casting is carried on the rollers are cut as the set cutting speed.

Meanwhile, the reference cutting speed is 511, the carbon parameter is 1.43, the thickness parameter is 1.10, and the temperature parameter is 0.222. The cutting speed is calculated by the above [Equation 1]. As shown in 7 (a), the number of cutting defects was greatly improved as compared with the related art, and as shown in FIG. 7 (b), the cutting speed was also improved. For reference, in FIG. 7B, 't' represents a basic thickness unit used in manufacturing a cast steel.

Although the present invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the present invention is not limited thereto but is limited by the following claims. Accordingly, those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the spirit of the following claims.

200: cutting speed setting device 210: cutting speed setting unit
220: cutting speed determination parameter measuring unit 221: carbon measuring unit
222: thickness measuring unit 223: temperature measuring unit
230: weighted DB 240: input display

Claims (10)

A cutting speed determining variable measuring unit measuring a cutting speed determining variable, which is a variable for determining a cutting speed of the cast steel, from a continuously cast steel casting;
An input display unit displaying a value of the measured cutting speed determination variable and having an automatic cutting speed setting input icon;
When there is a click of the cutting speed automatic setting input icon, the cutting speed is set differently according to the value of the measured cutting speed determining variable, and the cutting speed is set as the operation cutting speed of the slab cutting device. part;
Cutting speed setting device comprising a. The cutting speed setting device of claim 1, wherein the cutting speed setting unit multiplies the calculated cutting speed by a weight to calculate a weighted cutting speed, and sets the weighted cutting speed as an operation cutting speed of a slab cutting device. The cutting speed setting apparatus of claim 2, further comprising a weight database stored by varying the weight according to a value of the cutting speed determining variable. The cutting speed setting device according to any one of claims 1 to 3, wherein the cutting speed determining parameter includes any one or more of carbon contained in the continuously cast slab, the thickness of the cast steel, and the temperature of the cast steel. Measuring a cutting speed determining variable, which is a variable for determining a cutting speed of the cast steel, from the continuously cast steel casting;
Calculating a different cutting speed in accordance with the value of the measured cutting speed determining variable;
Setting the calculated cutting speed to an operating cutting speed of a slab cutting device;
Cutting speed setting method comprising a. The method of claim 5, further comprising calculating a weighted cutting speed by multiplying the calculated cutting speed by a weight, and setting the weighted cutting speed to an operating cutting speed of a slab cutting device. The cutting speed setting method according to claim 5 or 6, wherein the cutting speed determining parameter includes at least one of carbon contained in the continuously cast slab, thickness of the cast steel, and temperature of the cast steel. The method according to claim 5, wherein the calculated cutting speed = reference cutting speed-(carbon parameters × C)-(thickness parameters × H)-(temperature parameters × C) is calculated by, where C is the carbon value contained in the slab, H is the thickness of the cast steel, T is the temperature of the cast steel, the reference cutting speed is the reference cutting speed value, the carbon parameter is the parameter value multiplied by the carbon value to convert the carbon value to the cutting speed, the thickness parameter is the thickness A method of setting a cutting speed, in which a parameter value is multiplied by a thickness value to convert a value into a cutting speed, and a temperature parameter is a parameter value multiplied by a temperature value to convert a temperature value into a cutting speed. The method according to claim 6, wherein the weighted cutting speed = {reference cutting speed-(carbon parameters × C)-(thickness parameters × H)-(temperature parameters × C)} x is calculated by weight, where C is The carbon value contained, H is the thickness of the cast steel, T is the temperature of the cast steel, the reference cutting speed is the reference cutting speed value, and the carbon parameter is the parameter value multiplied by the carbon value to convert the carbon value to the cutting speed. , The thickness parameter is a parameter value multiplied by the thickness value to convert the thickness value to the cutting speed, and the temperature parameter is a parameter value multiplied by the temperature value to convert the temperature value to the cutting speed. The method of claim 8 or 9, wherein the reference cutting speed is 511, the carbon parameter is 1.43, the thickness parameter is 1.10, and the temperature parameter is 0.222.

Images