TWI541081B - Method for hot rolling steel slab - Google Patents

Description

Steel embryo hot rolling method

The present invention relates to a hot rolling method, and more particularly to a hot rolling method for guiding a steel bead of a rough roll.

During the hot rolling process, the steel blanks are first subjected to a descaling step followed by a series of rough mill processes to reduce the thickness to meet the requirements of the transfer bar. In the rough rolling process, the width control is carried out simultaneously by an edger or a slab sizing press. However, in the rolling process, the occurrence of the steel billet is often accompanied. There are many reasons for the side bend of the steel, including: the temperature difference in the width direction of the steel, the difference in the opening on both sides of the mill or the fact that the steel is not aligned with the center of the mill.

Please refer to FIG. 1A and FIG. 1B respectively, which respectively show the shape of the rough-rolled embryo head (tail) end in S-shaped and L-shaped side bends, wherein Lc represents the side bend length, δc represents the side bend amount and ρ represents the curvature. radius. Roughing of the roughing is a problem that will be encountered in all hot rolling lines, especially when the amount of side bends is too large, the rolling will occur during the finishing rolling. In this way, not only will the quality of the steel embryos be poor or production delays, but also the cost of production will increase.

At present, there are two main methods for improving the lateral bending of the rough-rolled blank during the hot rolling process, which are "constraining the side edge of the steel through the side guide" and "controlling the horizontal absorption of the roll". Taiwan Patent Publication No. I358332, Document 1, A "method and apparatus for particularly affecting rough strips in a roughing stand" is proposed, which is one of the methods of "constraining the side edges of the steel through the side guides". The patented technology restricts the side bend of the steel blank through the pressure control of the hydraulic side guide before and after the roughing mill, and corrects the wedge shape of the steel by the horizontal control of the hydraulic roll of the horizontal rolling mill. The correction principle of this technology is that when the steel blank is rolled to a preset thickness before the inlet, under the side guide clamping, the tension will be caused to the steel strip of the inlet and outlet, respectively, and the lateral mass flow of the steel strip will be changed to change the side bend. . The tension also causes a change in the rolling force on both sides of the horizontal mill, which must be controlled horizontally by the hydraulic rolls of the horizontal mill. The roll level adjustment is calculated by using the difference in rolling force between the two sides of the rolling mill, thereby improving the wedge shape of the outlet steel.

The method of "controlling the horizontal absorption of the roll" is mainly to control the roll level, absorb the side bend by the wedge shape, or measure the side deviation of the strip between the finish rolling inlet and the station as the roll level control target, and make the exit The steel strip is kept at the center of the rolling line. Moreover, this method mainly focuses on the two parts of the side bend measurement and the roll opening difference setting. Regarding the measurement of side bends, the 1986 Journal of the Iron and Steel Institute of Japan (ISIJ), No. 16, No. 2248 to 2255, Proposal 2, "Development of Camber Control" Technique in Plate Rolling)". The technique proposed in the literature 2 calculates the amount of lateral bending of the steel blank through an array of three width gauges, and gradually corrects the lateral bending during the reciprocating rolling process.

In addition, the document 3 of Japanese Laid-Open Patent Publication No. Hei 11-10215 proposes a technique of "Camber and wedge control in roughing mill and finishing mill". The system controls the next rolled steel preform by integrating the rough rolling outlet side bend and the finishing rolling outlet wedge shape. The document 4 of Japanese Laid-Open Patent Publication No. Hei 6-304628 proposes a "Camber control for slab tail end by leveling roughing mill" which utilizes the method of controlling the level of the roughing mill. The camera captures the image of the tail end of the steel and calculates the amount of side bends to serve as the basis for controlling the finishing rolls.

Regarding the setting of the roll opening difference, according to the literature 2 to the literature 4, after obtaining the side bend measurement result, the relationship between the change amount of the curvature of the steel and the amount of change of the wedge shape can be used to calculate the amount of the wedge to be adjusted for the correction of the side bend. . After calculating the target wedge shape, the driving side opening degree adjustment amount and the operation side opening degree adjustment amount can be calculated according to the opening degree difference between the two sides of the rolling mill to achieve the purpose of controlling the steel side curve.

Other methods for improving the side bend are disclosed in Document 5 and Document 6. Document 5 is Japanese Patent Publication No. Hei 6-7818, which proposes a method of controlling the amount of side bend and wedge shape by measuring the temperature of the steel in the rough rolling and finishing rolling process (Camber and wedge control by measuring slab temperature). In roughing mill and finishing mill)". The patented technology compensates for the temperature difference of the steel blank width, and uses the temperature distribution in the width direction of the high temperature metering side, and then adjusts the difference in the opening degree on both sides to correct the side bend amount. Document 6 is Japanese Laid-Open Patent Publication No. 2004-160530, which proposes a "Camber control by different width reduction using edger in roughing mill" in the rough rolling process. The side bend is corrected by the difference in the speed of the rolls on both sides of the edge rolling mill.

From the literature 1 to the literature 6, it is known that the methods disclosed in the documents 1 to 6 are mainly applied to the old roughing mill without the intermediate side guide configuration. Among them, Document 1 and Document 6 are applied to edge guides which are generally provided at the inlet or outlet of the roughing mill, and the control method is limited to the pressure control of the inlet or outlet side guide itself. The new roughing mill design incorporates an intermediate side guide between the horizontal and side mills to help improve the bending of the end of the steel. However, the intermediate side guide is limited by space and maintenance is difficult. Therefore, in addition to the problem of improving the side bend of the steel end, the intermediate side guide should also be prevented from being damaged by the wear of the steel end end side bend. However, there is currently no relevant literature for the control and adjustment of roughing blanks during hot rolling for intermediate edge guides.

Therefore, one aspect of the present invention is to provide a hot rolling method for steel blanks, which is mainly designed for a new type of hot rolling system with intermediate side guides, which is used in the hot rolling process, using both sides of the edge rolling mill. The rolling force and the pressure of the intermediate side guides control the opening of the intermediate side guide, thereby correcting the problem of side bending while the roughing blank is subjected to rolling. Furthermore, the opening adjustment of the inlet side guide and the outlet side guide can constrain the direction of movement of the rough-rolled blank to avoid large-scale cornering of the rough-rolled blank during the rolling process. In addition, the opening degree of the intermediate side guide can be adjusted at any time according to the maximum pressure value that can be withstood on both sides of the intermediate side guide during the rolling process, so as to avoid damage of the intermediate side guide due to excessive pressure.

According to the above object of the present invention, a hot rolling method for a steel preform is provided, which comprises the following steps. A roughing embryo is provided. Using a side mill to rough the blank At the head end, the rough rolling embryo is rolled. The first rolling force difference when rolling the end of the edge rolling mill is measured. The head end of the roughing blank is guided to the inlet of the horizontal rolling mill by means of an intermediate side guide. The first intermediate pressure value when the measuring head end contacts the intermediate side guide. The first opening adjustment value is calculated according to the first rolling force difference value and the first intermediate pressure value. The first adjusting step is performed to adjust the opening degree of the intermediate side guide according to the first opening degree adjustment value. The horizontal rolling mill is used to perform a horizontal rolling step from the head end of the roughing blank to the roughing blank. When the edge rolling mill rolls the tail end of the rough rolling mill, the second rolling force difference of the edge rolling mill and the second intermediate pressure value of the rough rolling embryo contacting the intermediate side guide are measured. The second opening degree adjustment value is calculated according to the second rolling force difference value and the second intermediate pressure value. A second adjustment step is performed to adjust the opening of the intermediate side guide according to the second opening adjustment value. After the second adjustment step, the horizontal rolling mill continuously rolls the rough-rolled embryo until the rough-rolled embryo is completely removed from the horizontal rolling mill.

According to an embodiment of the present invention, the hot rolling method of the steel preform further includes performing a third adjusting step to relax the middle according to the preset value when the first intermediate pressure value or the second intermediate pressure value is greater than a preset value. The opening of the edge guide.

According to another embodiment of the present invention, the hot rolling method of the steel preform further includes an inlet adjusting step of measuring the inlet pressure of the inlet side guide while guiding the roughing blank into the edge rolling mill at the inlet side guide. The difference is adjusted according to the inlet pressure difference to adjust the opening of the inlet guide.

According to still another embodiment of the present invention, the intermediate side guide maintains a fixed opening.

According to still another embodiment of the present invention, the hot rolling method of the steel preform described above Furthermore, an outlet adjustment step is included to measure the outlet pressure difference of the outlet side guide and adjust the outlet pressure difference according to the outlet pressure difference when the outlet side guide guides the leading end of the roughing blank to the trailing end and completely separates from the edge rolling mill. The outlet side guide opening.

In accordance with still another embodiment of the present invention, the intermediate side guide maintains a fixed opening when the head end of the roughing blank contacts the outlet side guide and the trailing end contacts the inlet side guide.

100‧‧‧ hot rolling system

101‧‧‧ rough rolling embryo

101a‧‧‧ head end

101b‧‧‧End

110‧‧‧Inlet side guide

130‧‧‧ side rolling mill

150‧‧‧Intermediate side guide

170‧‧‧ horizontal rolling mill

190‧‧‧Export side guide

200‧‧‧ hot rolling method

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D1‧‧‧ rolling direction

EG_F1‧‧‧ rolling force

EG_F2‧‧‧ rolling force

IMEG_F1‧‧‧ Pressure

IMEG_F2‧‧‧ Pressure

Lc‧‧‧bend length

δc‧‧‧Bend amount

Ρ‧‧ radius of curvature

The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; shape.

Figure 1B shows the shape of the L-shaped side end of the rough-rolled embryo head (tail).

2 is a schematic view of a device of a hot rolling system according to an embodiment of the present invention.

3 is a flow chart showing a hot rolling method of a steel blank according to an embodiment of the present invention.

Fig. 4 is a schematic view showing the rough end of the rough-rolled end of the invention according to an embodiment of the present invention when it is bent into the edge rolling mill.

Fig. 5 is a schematic view showing the rough end of the rough rolling end bent into the edge rolling mill according to an embodiment of the present invention.

Figure 6 is a schematic diagram showing the control of the inlet side guide, the outlet side guide, and the intermediate side guide according to an embodiment of the present invention.

Figure 7 is a diagram showing the result of controlling the rough end of the roughing end by an intermediate side guide according to an embodiment of the present invention.

Figure 8 is a diagram showing the result of controlling the end of the rough rolling embryo by the intermediate side guide according to an embodiment of the present invention.

FIG. 9 is a comparison diagram showing the effect of guiding the side bends of the intermediate side guide according to an embodiment of the present invention.

Please refer to FIG. 2, which is a schematic diagram of a device of a hot rolling system according to an embodiment of the present invention. In the present embodiment, the hot rolling system 100 mainly includes an inlet side guide 110, a side rolling mill 130, an intermediate side guide 150, a horizontal rolling mill 170, and an outlet side guide 190. The inlet side guide 110 is disposed upstream of the side mill 130 and is primarily used to guide the roughing blank into the edge mill 130. The intermediate side guide 150 is disposed downstream of the edge rolling mill 130, and the horizontal rolling mill 170 is disposed downstream of the intermediate side guide 150. Therefore, the intermediate side guide 150 is disposed between the edge rolling mill 130 and the horizontal rolling mill 170. In addition, the outlet side guide 190 is disposed downstream of the horizontal rolling mill 170 such that the horizontal rolling mill 170 is interposed between the intermediate side guide 150 and the outlet side guide 190.

The roughing blank travels along the rolling direction D1, and after the roughing mill is rolled by the edge rolling mill 130, it is guided through the intermediate side guide 150 into the horizontal rolling mill 170. After rolling through the horizontal mill 170, the roughing blank will enter the outlet side guide 190 and be directed to the hot rolling system 100 via the outlet side guide 190.

Please refer to FIG. 2 and FIG. 3 simultaneously, wherein FIG. 3 is a flow chart showing a hot rolling method of a steel blank according to an embodiment of the present invention. One embodiment of the present invention primarily provides a hot rolling method 200 for a steel blank. The hot rolling method 200 is a part of the rough rolling end of the rough end and the tail end. When entering the edge rolling mill 130, the opening degree of the intermediate side guide 150 is controlled according to the rolling force difference between the two sides of the edge rolling mill 130, so as to prevent the rough rolling blank from excessively deviating from the center of the horizontal rolling mill 170 before entering the horizontal rolling mill 170. Moreover, while controlling the intermediate side guide 150, the pressure applied to both sides of the intermediate side guide 150 is considered to prevent the intermediate side guide 150 from being damaged due to excessive pressure.

Please refer to FIG. 3, FIG. 4 and FIG. 5 , wherein FIG. 4 and FIG. 5 respectively show schematic diagrams of the rough rolling end and the end side bending respectively entering the edge rolling mill. In the present embodiment, when hot rolling is performed, step 202 may be performed first to provide a rough rolling blank 101. The roughing blank 101 has a head end 101a and a tail end 101b. Wherein, the head end 101a is one end of the rough rolling blank 101 first entering the hot rolling system 100, and the tail end 101b is opposite to the head end 101a, and the rough rolling blank 101 is finally separated from one end of the hot rolling system 100.

In one embodiment, as shown in FIG. 4, as the roughing blank 101 enters the hot rolling system 100, the inlet side guide 110 will direct the roughing blank 101 into the edge rolling mill 130. Wherein, in the process of passing the roughing blank 101 through the inlet side guide 110, if the leading end 101a of the rough rolling blank 101 is bent sideways, the head end 101a will come into contact with the inlet side guide 110. At this time, the inlet side guide 110 may first perform an inlet adjustment step on the tip end 101a of the roughing blank 101. The inlet adjustment step mainly measures the pressure on both sides of the inlet side guide 110 to obtain the inlet pressure difference. Next, the opening degree of the inlet side guide 110 is adjusted in accordance with the inlet pressure difference. Thereby, the direction of movement of the rough rolling blank 101 can be restrained to prevent the roughing blank 101 from being greatly bent when entering the edge rolling mill 130.

Next, in step 204, after the rough rolling blank 101 enters the inlet side guide 110, the rough rolling blank 101 continues to advance along the rolling direction D1, and the head end 101a of the rough rolling blank 101 first enters the edge rolling mill 130 and starts to be rolled. Delay. While the edge rolling mill 130 rolls the tip end 101a of the rough rolling blank 101, step 206 is performed. Step 206 is mainly to measure the difference in rolling force between the two sides of the edge rolling mill 130 to obtain the first rolling force difference. Wherein, as shown in FIG. 4, the rolling force on both sides of the edge rolling mill 130 is respectively represented by EG_F1 and EG_F2, and the difference of the first rolling force difference is the absolute value of the difference between the rolling forces on both sides. The calculation formula is as follows: (1): dF _EG (t) = | EG_F1 (t) - EG_F2 (t) | (1) where dF _EG (t) is the difference in rolling force between the two sides of the edge rolling mill 130, that is, A rolling force difference; t represents time.

After the edge rolling mill 130 rolls the leading end 101a of the rough rolling blank 101, as the rough rolling blank 101 advances along the rolling direction D1, the edge rolling mill 130 continues to roll the rough rolling blank toward the end 101b of the rough rolling blank 101. 101, until the head end 101a of the roughing blank 101 enters the intermediate side guide 150, then proceed to step 208. Step 208 is primarily to direct the leading end 101a of the roughing blank 101 to the inlet of the horizontal rolling mill 170 using the intermediate side guide 150. When the head end 101a of the roughing blank 101 contacts the intermediate side guide 150, step 210 is next performed. Step 210 is mainly to measure the pressure of the roughened blank 101 contacting the two sides of the intermediate side guide 150 during the process of guiding the rough rolling blank 101 by the intermediate side guide 150 to obtain the first intermediate pressure value. Wherein, the fourth figure shows the pressures on both sides of the intermediate side guide 150 by IMEG_F1 and IMEG_F2, respectively, and the first intermediate pressure value is calculated by taking the pressure on both sides of the intermediate side guide 150, and the calculation formula is as follows Formula (2): tF _IMSG (t) = IMEG_F1 (t) + IMEG_F2 (t) (2) where tF _IMSG (t) is the sum of the pressures on both sides of the intermediate side guide 150, that is, the first intermediate pressure value. 4 and 5 show, in solid lines, that the roughing blank 101 has contact with the intermediate side guide 150, and the broken line indicates that the roughing blank 101 does not contact the intermediate side guide 150. For the sake of clarity, the roughening of the roughing blank 101 shown in Figures 4 and 5 is only an example and is not intended to limit the invention. Depending on the side bend of the roughing blank 101, the pressures IMEG_F1 and IMEG_F2 on both sides of the intermediate side guide 150 may also differ.

After the first rolling force difference value and the first intermediate pressure value are obtained, step 212 is performed. Step 212 is mainly to calculate a first opening degree adjustment value according to the first rolling force difference value and the first intermediate pressure value, and the calculation formula is represented by the following formulas (3) and (4).

among them, The intermediate guide opening setting value calculated by using the sampling point; dS _IMSG (t) is the first opening adjustment value; and k ₁ ~ k ₃ and a ₁ ~ a ₃ are constant control parameters. The first opening adjustment value can be used as a basis for setting the opening of the intermediate side guide 150. Therefore, the opening degree value of the intermediate side guide 150 can be obtained by adding the first opening degree adjustment value to the width of the roughing blank 101 at the exit of the edge rolling mill 130.

After the first opening adjustment value is obtained, step 214 is followed. Step 214 is a first adjustment step of adjusting the opening degree of the intermediate side guide 150 according to the first opening degree adjustment value. In an embodiment, the intermediate side guide 150 is connected to an opening adjuster (not shown), and the opening degree adjuster can adjust the opening degree of the intermediate side guide 150 to restrain the moving direction of the rough rolling blank 101, thereby avoiding The roughing blank 101 is excessively offset from the center of the horizontal rolling mill 170 as it enters the horizontal rolling mill 170. After adjusting the opening of the intermediate side guide 150, step 216 is performed. Step 216 is a horizontal rolling step in which the horizontal rolling mill 170 is horizontally rolled from the head end 101a of the roughing blank 101.

After the horizontal rolling mill 170 rolls the leading end 101a of the rough rolling blank 101, as the rough rolling blank 101 advances along the rolling direction D1, the horizontal rolling mill 170 continues to roll the rough rolling blank toward the end 101b of the rough rolling blank 101. 101. In one embodiment, when the edge rolling mill 130 is rolled to a position in the middle of the roughing blank 101, as shown in Fig. 5, the leading end 101a of the roughing blank 101 contacts the outlet side guide 190, and the trailing end 101b contacts Inlet side guide 110. At this time, the effect of the intermediate side guide 150 on the roughing blank 101 is not so great, so that the intermediate side guide 150 can be opened and the fixed opening degree can be maintained to reduce the friction between the rough rolling blank 101 and the intermediate side guide 150.

At this time, the roughing blank 101 is subjected to rolling on the one hand by the horizontal rolling mill 170, and on the other hand, along the guide of the outlet side guide 190 until the trailing end 101b of the roughing blank 101 starts to enter the edge rolling mill 130, and then Go to step 218. At the trailing end 101b of the roughing blank 101, it is delayed by the edge rolling mill 130. If the roughing blank 101 has a side bend, the rough rolling blank 101 will partially contact the intermediate side guide 150. Therefore, step 218 is mainly to measure the pressure exerted by the rough rolling blank 101 on both sides of the edge rolling mill 130 when the edge rolling mill 130 is rolling the trailing end 101b of the rough rolling mill 101, thereby further obtaining the second rolling force difference. . Step 218 also measures a second intermediate pressure value applied to the intermediate side guide 150 when the roughing blank 101 contacts the intermediate side guide 150. Wherein, the formulas of the second rolling force difference value and the second intermediate pressure value are respectively compared with the aforementioned formulas (1) and (2) The same, will not be described here.

After the second rolling force difference and the second intermediate pressure are obtained, step 220 is performed. Step 220 is to calculate a second opening degree adjustment value according to the second rolling force difference value and the second intermediate pressure value, and the calculation formula is expressed by the following formulas (5) and (6).

among them, The intermediate guide opening setting value calculated by using the sampling point; dS _IMSG (t) is the second opening degree adjustment value; and k ₄ ~ k ₅ and a ₄ ~ a ₅ are constant control parameters. The second opening adjustment value is also used as a basis for setting the opening of the intermediate side guide 150. After the second opening adjustment value is obtained, step 222 is followed. Step 222 is a second adjustment step of adjusting the opening degree of the intermediate side guide 150 again according to the second opening degree adjustment value to perform correction of the trailing end 101b of the roughing blank 101. After the opening of the intermediate side guide 150 is adjusted, step 224 is performed. Step 224 is after the second adjustment step is performed, the horizontal rolling mill 170 continues rolling the rough rolling blank 101 until the trailing end 101b of the rough rolling blank 101 is completely separated from the horizontal rolling mill 170. Wherein, when the trailing end 101b of the roughing blank 101 is completely separated from the horizontal rolling mill 170, an outlet adjusting step can be performed. The outlet adjustment step mainly measures the pressure from the roughing blank 101 on both sides of the outlet side guide 190 to obtain the outlet pressure difference, and then adjusts the opening degree of the outlet side guide 190 according to the outlet pressure difference. Thereby, the lateral bending direction of the roughing blank 101 can be continuously controlled.

In order to prevent the intermediate side guide 150 from being subjected to excessive pressure and being damaged by the severe side bend of the roughing blank 101, when controlling the opening degree of the intermediate side guide 150, it is necessary to consider whether the first intermediate pressure value or the second intermediate pressure value is It is greater than the maximum pressure that the intermediate side guide 150 can withstand. Therefore, in an embodiment, the maximum pressure that the intermediate side guide 150 can bear can be used as a preset value. In step 214 or step 222, if the first intermediate pressure value or the second intermediate pressure is greater than the preset. The value should be adjusted and the opening of the intermediate side guide 150 should be adjusted again according to the preset value.

Please refer to FIG. 4 to FIG. 6 , wherein FIG. 6 is a schematic diagram showing the control situation of the inlet side guide, the outlet side guide and the intermediate side guide according to an embodiment of the invention. As can be seen from Fig. 6, in the head end control stage, after the roughing blank 101 enters the edge rolling mill 130, the inlet side guide 110 and the intermediate side guide 150 start to control the traveling direction of the roughing blank 101, respectively. The intermediate side guide 150 adjusts the opening degree according to the rolling force of the edge rolling mill 130 and the pressure of the intermediate side guide 150. In the middle stage control phase, when the leading end 101a of the roughing blank 101 travels to the position of the outlet side guide 190, the outlet side guide 190 starts the control of the traveling direction of the roughing blank 101. At this time, the roughing blank 101 travels to a position where the head end 101a contacts the outlet side guide 190, and the trailing end 101b contacts the inlet side guide 110. To avoid the abrasion of the intermediate side guide 150, the intermediate side guide 150 is Turn on and maintain a certain degree of opening. Before the end 101b of the rough rolling mill 101 is separated from the edge rolling mill 130, the opening degree of the intermediate side guide 150 is calculated according to the difference in rolling force between the two sides of the edge rolling mill 130, and then enters the tail end control stage, and the intermediate side guide 150 continues to be thick. Embossed 101 The side bend correction of the tail end 101b.

Please refer to FIG. 7 and FIG. 8 , which respectively show the results of controlling the rough end and the end of the rough rolling head according to an embodiment of the present invention. It can be seen from Fig. 7 that after the sampling of the head end, the opening degree of the intermediate side guide decreases as the rolling force difference between the two sides of the edge rolling mill increases, but the opening degree is relaxed as the pressure of the intermediate side guide increases. . As can be seen from Fig. 8, after the sampling end is calculated, the intermediate side guide moves to the target opening degree. And as the end of the rough rolling mill exits the edge rolling mill, the intermediate side guide adjusts the opening according to the pressure received by the intermediate side guide.

Please refer to FIG. 9 , which is a comparative diagram showing the effect of guiding the side bends of the intermediate side guide according to an embodiment of the present invention. The invention adopts the L-shaped side-bent rough-rolled embryo whose tail end is S-shaped side-bend and the L-shaped side-bend rough-rolled embryo shown in FIG. 1B as the experimental target. The horizontal axis shown in Fig. 9 is the length Lc of the side bend of the rough end of the rough rolling, and the vertical axis is the logarithm of the curvature radius of the rough end of the rough rolling end. It can be seen from Fig. 9 that in the case of using the intermediate side guide, the measured side bend length is smaller than that of the rough rolled blank which does not use the intermediate side guide, regardless of the S-shaped side bend or the L-shaped side bend. Side bend length. In addition, the value of the side bending rate radius of the roughing blank guided by the intermediate side guide is also larger than the value of the side bending rate radius of the roughing blank without the intermediate side guide. This means that the roughing of the roughened blank guided by the intermediate side guide is small. From this, it can be seen that the opening degree of the control intermediate side guide through the present invention can indeed improve the problem of the roughing of the rough rolling.

It can be seen from the above embodiments that the advantages of the present invention are designed for a new hot rolling system having an intermediate side guide, mainly in the hot rolling process. In the middle, the rolling force on both sides of the edge rolling mill and the pressure of the intermediate side guide are used to control the opening degree of the intermediate side guide, thereby correcting and improving the side bending problem while the rough rolling blank is subjected to rolling. Furthermore, the opening adjustment of the inlet side guide and the outlet side guide can constrain the direction of movement of the rough-rolled blank to avoid large-scale cornering of the rough-rolled blank during the rolling process. In addition, while controlling the intermediate side guide, the present invention also considers the pressure that can be withstood on both sides of the intermediate side guide, and can at any time depend on the maximum pressure value that can be withstood on both sides of the intermediate side guide during the rolling process. To adjust the opening of the middle edge guide to avoid damage to the intermediate side guide due to excessive pressure.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

200‧‧‧ hot rolling method

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Claims (6)

A hot rolling method for steel blanks, comprising: providing a rough rolling blank; rolling a rough rolling blank from a head end of the rough rolling mill by using a side rolling mill; measuring one of the first rolling ends of the edge rolling mill a difference in rolling force; guiding the head end of the roughing blank to an inlet of a horizontal rolling mill by using an intermediate side guide; measuring a first intermediate pressure value when the head end contacts the intermediate side guide; Calculating a first opening adjustment value according to the first rolling force difference value and the first intermediate pressure value; performing a first adjusting step to adjust the intermediate side guide according to the first opening adjustment value Opening a degree; using the horizontal rolling mill to perform a horizontal rolling step on the roughing blank from the head end of the rough rolling blank; and measuring the edge rolling mill when the edge rolling mill rolls one end of the rough rolling blank a second rolling force difference value and a second intermediate pressure value of the rough rolling blank contacting the intermediate side guide; calculating a second opening degree adjustment according to the second rolling force difference value and the second intermediate pressure value a second adjustment step to adjust the opening of the intermediate side guide according to the second opening adjustment value And after the second step of adjusting the duration of horizontal mills and rolling the rough rolling until the embryo completely detached from the embryo rough rolling mill until the level. The hot rolling method of the steel preform according to claim 1 further comprises performing one And a third adjusting step, when the first intermediate pressure value or the second intermediate pressure value is greater than a preset value, the opening degree of the intermediate side guide is relaxed according to the preset value. The hot rolling method of the steel preform according to claim 1, further comprising an inlet adjusting step of measuring the inlet side guide while guiding the rough rolling blank into the edge rolling mill at an inlet side guide An inlet pressure difference, and adjusting the opening of the inlet side guide according to the inlet pressure difference. A hot rolling method for a steel blank according to claim 3, wherein the intermediate side guide maintains a fixed opening degree. The hot rolling method for a steel preform according to claim 3, further comprising an outlet adjusting step of guiding the head end of the rough rolling blank to an end of the edge rolling mill at an outlet side guide, The outlet pressure difference of one of the outlet side guides is measured, and the outlet side guide opening is adjusted according to the outlet pressure difference. The hot rolling method for a steel preform according to claim 5, wherein the intermediate side guide is maintained when the head end of the rough rolling contact contacts the outlet side guide and the tail end contacts the inlet side guide Fixed opening.