TWI763572B - Method and system for rolling a steel slab having a wedge shape - Google Patents

Abstract

A method and a system for rolling a steel slab having a wedge shape are provided. The system includes a vertical roller, a steel slab width measuring device and a rolling control system. The rolling control system is configured to perform the method for rolling the steel slab having a wedge shape. The method includes: obtaining a steel slab shape data; determining if the steel slab is in a bad wedge shape; determining if a difference between a rolled target value and a slab width value is greater than a threshold value; modifying the rolled target value when the steel slab is in the bad wedge shape and the difference between the rolled target value and the slab width value is not greater than the threshold value, in which the rolled target value is smaller than the width value of the steel slab, and a difference therebetween is greater than the threshold value; and performing an edge rolling process by using grooved rolls of the vertical roller in accordance with the .

Description

Rolling method and rolling system of wedge-shaped billets

The present invention relates to a rolling method and rolling system for wedge-shaped steel billets.

The hot rolling system uses flat steel billets as raw materials, which are first heated and softened at high temperature, and then rolled into steel strips by rough rolling mills and finishing mills. Then, after cooling by spraying water, it is produced in the form of coils. Although the shape of the flat steel billet is a symmetrical cuboid, if the shape variation (wedge) occurs due to cooling or equipment during the steelmaking and continuous casting process, the subsequent rolling center may be offset, resulting in impact and/or damage. Risk of hot rolling equipment.

In order to solve the above problems, embodiments of the present invention provide a rolling method and rolling system for wedge-shaped billets, which can reduce the risk of impacting and/or damaging hot rolling equipment due to the offset of rolling center.

According to an embodiment of the present invention, the method for rolling a wedge-shaped steel billet includes: obtaining a shape data of a steel billet, wherein the shape data of the steel billet includes steel The width value of the steel billet; according to the shape data of the steel billet, it is judged whether the steel billet belongs to the bad wedge shape; when the billet belongs to the bad wedge shape, it is judged whether the difference between the target width value after rolling and the steel billet width value is greater than one Threshold value of cutting amount; when the difference between the target width value after rolling of the billet and the width value of the billet is not greater than the cutting amount threshold, modify the target width value after rolling, and the target width after rolling after modification is less than The width value of the steel billet, and the difference between the modified target width value after rolling and the steel billet width value is greater than the cutting amount threshold; and according to the modified target width value after rolling, a trimming process is performed on the steel billet, Among them, this trimming process adopts grooved trimming rollers.

In some embodiments, the above-mentioned rolling method of wedge-shaped steel billet further includes using a side guide to perform a side edge correction process on the edge-cut steel billet, wherein the side edge correction process is on the edge-cut steel billet. Apply clamping pressure.

In some embodiments, the clamping pressure is greater than 4.5 tons.

In some embodiments, the rolling method for the wedge-shaped steel billet further comprises: performing a horizontal rolling process on the steel billet.

In some embodiments, the aforementioned horizontal rolling process includes: calculating a horizontal inclination amount of a roll according to a roll length of a horizontal roll and the aforementioned steel billet profile data; and adjusting the inclination of a horizontal roll according to the horizontal inclination amount of the roll amount to roll the billet with the horizontal rolls.

According to an embodiment of the present invention, the rolling system for the wedge-shaped billet includes: a vertical rolling mill, a billet width measuring device, and a rolling control system. Vertical mills contain grooved trimming rolls. The rolling control system is used for: the shape data of the steel billet, wherein the shape data of the steel billet includes the width value of the steel billet; The shape data is used to judge whether the steel billet is wedge-shaped bad; when the steel billet is wedge-shaped bad, it is judged whether the difference between the target width value after rolling and the steel billet width value is a reduction threshold; When the difference between the target width value after rolling and the width value of the billet is not greater than the cutting amount threshold, modify the target width value after rolling, wherein the target width value after rolling is less than the billet width value, and the modified The difference between the target width value after rolling and the width value of the steel billet is greater than the cutting amount threshold; and according to the modified target width value after rolling rolling, a trimming process is performed on the billet, and a billet width measuring device is used to measure the width of the billet. Measure the width of the steel billet, in which this trimming process uses a grooved trimming roller.

In some embodiments, the aforementioned wedge-shaped steel billet rolling system further includes a side guide for performing a side edge correction process on the steel billet after edge trimming, wherein the side edge correction process is a side edge correction process for the edge trimming process. The billet applies a clamping pressure.

In some embodiments, the clamping pressure is greater than 4.5 tons.

In some embodiments, the aforementioned wedge-shaped steel billet rolling system further includes a horizontal rolling mill, wherein the aforementioned rolling control system is further configured to: control the horizontal rolling mill to perform a horizontal rolling process on the steel billet.

In some embodiments, the horizontal rolling process includes: calculating a horizontal inclination amount of a roll according to the roll length of one of the horizontal rolls and the profile data of the steel billet; and adjusting the inclination amount of a horizontal roll of the horizontal rolling mill according to the horizontal inclination amount of the roll, The steel billet is rolled with horizontal rolls.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

100: Rolling system for wedge-shaped billets

110: Rolling line

112: The first rolling mill station

112a: Vertical Mill

112b: Horizontal Mill

112c: Steel billet width measuring device

114: Second Mill Station

114a: Vertical Mill

114b: Horizontal Mill

114c: Steel billet width measuring device

116: Conveyor

118: Steel billet width measuring device

120: Rolling control system

210: Grooved edge trimming roller

212: groove part

220: Steel Billet

222: Side bending billet part

300: Rolling method of wedge-shaped billets

310~350: Steps

410: Horizontal roll

510: Edge guide

dS1: Slope amount

H1, H2: height

W: steel billet width

△t: height difference

FIG. 1 illustrates a rolling system for a wedge-shaped billet according to an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating the rolling of a billet by a groove-shaped trimming roller according to an embodiment of the present invention.

FIG. 3 is a schematic flowchart illustrating a rolling method of a wedge-shaped steel billet according to an embodiment of the present invention.

4 is a schematic diagram illustrating a horizontal roll and a steel billet according to an embodiment of the present invention.

5 is a schematic diagram illustrating an edge guide according to an embodiment of the present invention.

The following is a detailed description of the embodiments in conjunction with the accompanying drawings, but the provided embodiments are not intended to limit the scope of the present invention, and the description of the structure operation is not intended to limit the order of its execution. Any structure that is recombined by elements , the resulting devices with equal efficacy are all within the scope of the present invention. In addition, the drawings are for illustrative purposes only and are not drawn in full scale.

The terms "first", "second", .

Please refer to FIG. 1 , which illustrates a rolling system 100 for wedge-shaped billets according to an embodiment of the present invention, which includes a rolling production line 110 and a rolling control system 120 . Rolling line 110 is used to receive billets and roll them into strips. The rolling control system 120 is electrically connected to the rolling line 110 to control The production process of the rolling extension line 110 . For example, in this embodiment, the rolling production line 110 includes a first rolling mill station 112, a second rolling mill station 114, a conveying device 116 and a billet width measuring device 118, and the rolling control system 120 is used to control the first rolling mill station 112. The operation of the mill station 112 , the second mill station 114 , and the conveying device 116 is to roll the billets (not shown) on the conveying device 116 . In one embodiment, the wedge-shaped billet rolling system 100 can receive billet profile data provided by a steel mill. Steel mills can use, for example, the technology of ROC Patent No. 1251661 to obtain the shape data of the steel billet.

The first rolling mill station 112 includes a vertical rolling mill 112a, a horizontal rolling mill 112b, and a billet width measuring device 112c. The vertical rolling mill 112a includes vertical groove-shaped trimming rollers for trimming the steel billets. In the trimming process, the side of the steel blank is rolled through a vertical groove-shaped trimming roller to adjust the width of the steel blank, as shown in Figure 2. In FIG. 2 , the groove portion 212 of the groove-shaped trimming roller 210 is aligned with the side edge of the steel blank 220, and the side edge of the steel blank is rolled to achieve the purpose of cutting the width of the steel blank. The horizontal rolling mill 112b is used to perform a horizontal rolling process on the steel billet, so as to roll the steel billet into a strip shape and control the thickness of the steel billet. The billet width measuring device 112c is used to measure the billet width/offset value after rolling by the vertical rolling mill 112a and the horizontal rolling mill 112b, and transmit it to the rolling control system 120. Among them, the offset value of the billet represents the degree of offset of the center of the billet after rolling.

During rolling, the first rolling mill station 112 can roll the steel billet multiple times, and the billet width measuring device 112c can measure the width/offset value of the billet after rolling accordingly. For example, the billet may be rolled back and forth through the first rolling mill station 112 multiple times. In this embodiment, the steel billet will reciprocate through The first mill station 112 is five times, but embodiments of the present invention are not so limited.

The second rolling mill station 114 includes a vertical rolling mill 114a, a horizontal rolling mill 114b, and a billet width measuring device 114c. The vertical rolling mill 114a includes vertical groove-shaped trimming rollers for trimming the steel billets. In the trimming process, the side of the steel blank is rolled through a vertical groove-shaped trimming roller to adjust the width of the steel blank. The horizontal rolling mill 114b is used to perform a horizontal rolling process on the steel billet to control the thickness of the steel billet. The billet width measuring device 114c is similar to the billet width measuring device 112c, and is used to measure the billet width/offset value after rolling by the vertical rolling mill 114a and the horizontal rolling mill 114b, so as to obtain the corresponding billet shape data , and send it to the rolling control system 120 .

During rolling, the second rolling mill station 114 can roll the steel billet multiple times, and the billet width measuring device 114c can measure the width/offset value of the billet after rolling accordingly. For example, the billet may be rolled back and forth through the second rolling mill station 112 multiple times. In this embodiment, the steel billet will reciprocate through the second rolling mill station 114 three times, but embodiments of the present invention are not limited thereto.

In some embodiments, the first rolling mill station 112 may be suitable for the rough rolling process, and the second rolling mill station 114 may also be suitable for the rough rolling process, but embodiments of the present invention are not limited thereto.

In addition, before the first rolling mill station 112 , a steel billet width measuring device 118 may be further installed to measure the billet width/offset value of the steel billet before the steel billet enters the first rolling mill station 112 . The function of the billet width measuring device 118 is similar to that of the billet width measuring device 112c, so it is not repeated here.

Please refer to FIG. 3 , which illustrates a wedge-shaped steel according to an embodiment of the present invention A schematic flowchart of the rolling method 300 of the green sheet, wherein the rolling method 300 is suitable for the rolling control system 120 of the rolling system 100 described above. In the rolling method 300, step 310 is first performed to obtain a steel billet profile data provided by a steel mill. As mentioned earlier, steel mills can use techniques such as ROC Patent No. I251661 to obtain profile data for steel billets.

Then, go to step 320 to determine whether the steel blank is wedge-shaped defect according to the shape data of the steel blank. In this embodiment, when the thicknesses of the two sides in the width direction of the steel blank are unequal, it is determined that the steel blank is in a bad wedge shape. When it is determined that the billet is wedge-shaped, step 330 is performed to determine whether the difference between the preset target width value after rolling and the aforementioned billet width value is greater than a cut-off threshold, such as 30 millimeters (mm) . When the difference between the preset target width value after rolling and the aforementioned steel billet width value is not greater than 30 mm, step 340 is performed to modify the target width value after rolling. The modified target width value after rolling is smaller than the aforementioned steel billet width value, and the difference is greater than 30 mm. Next, step 350 is performed to perform a trimming process on the steel billet according to the modified target width value after rolling. In the embodiment of the present invention, the steel billet can be analyzed through finite element model analysis, so as to obtain an appropriate cut-off threshold value according to actual requirements.

Specifically, if the original target width after rolling of the first rolling mill 112 is 1280 mm, and the current steel billet width is 1300 mm, step 340 will modify the target width after rolling, for example, 1250 mm, so that the difference between the revised target width value after rolling and the current steel billet width value (ie, 50 mm) is greater than 30 mm. Next, step 350 controls the vertical rolling mill 112a of the first rolling mill station 112 to roll at 1250 mm After the target width value, the trimming process is performed. Specifically, in this embodiment, a product originally corresponding to an order requirement of 1280 mm is converted into a product corresponding to an order requirement of 1250 mm, so as to meet the size requirement of the product.

It can be seen from the above description that in the embodiment of the present invention, when it is detected that the steel billet has a bad wedge shape, the target width value after rolling is changed, and the preset cutting amount is increased, so that the cutting amount is greater than the cutting amount threshold ( For example, 30 mm), so that the thickness difference of the wedge-shaped billet can be eliminated by using the groove-shaped trimming roll of the vertical rolling mill.

In some embodiments of the present invention, the above-mentioned wedge-shaped billet rolling method 300 can readjust the angle of the horizontal rolls of the horizontal rolling mill 112b to have an inclination amount (the inclination trend is the same as that of the billet), and then use the horizontal rolling mill The horizontal roll of 112b is used to roll the steel billet to reduce the side bending of the steel billet and prevent the steel billet from being unable to enter the next process.

Please refer to FIG. 4 , which is a schematic diagram of a horizontal roller 410 and a steel blank 220 according to an embodiment of the present invention. As shown in FIG. 4 , the horizontal roll 410 of the horizontal rolling mill 112b has an inclination amount dS1, the heights of the two sides of the billet 220 are H1 and H2, respectively, and the height difference is Δt. The inclination amount ds1 can be calculated according to the following formula (1):

where b=0.3; a=0.6; Lc is the length of the horizontal roll; W is the width of the steel billet; EqWedge is the equivalent wedge, which can be calculated according to the following formula (2): EqWedge=(dH*dW)/W (2)

where dH is the thickness reduction of a significant downslope section; dW is The width of the significant downslope segment. It should be noted that although the upper surface of the steel blank 220 shown in FIG. 4 of the present pattern has a fixed slope, FIG. 4 of the present pattern is only used for convenience of description. In fact, the upper surface of the steel billet 220 has sections with different slopes, and the section with a larger slope is a significantly downward sloped section.

In some embodiments of the present invention, the rolling line 110 may further include an edge guide 510 , as shown in FIG. 5 . The edge guide 510 is arranged between the first rolling mill station 112 and the second rolling mill station 114 to perform a side correction process for the steel billet 220 after rolling through the first rolling mill station 112. The acting force generates torque on the section of the side-bending steel billet portion 222, resulting in a difference in the stress distribution of the section, and improving the side-bending degree after horizontal rolling. In this embodiment, the clamping pressure of the side guide is greater than 4.5 tons, but the embodiment of the present invention is not limited to this.

Although the present invention has been disclosed above by the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the scope of the appended patent application.

300: Rolling method of wedge-shaped billets

310~350: Steps

Claims (10)

A rolling method for a wedge-shaped steel billet, comprising: obtaining a shape data of a steel billet, wherein the shape data of the steel billet includes a width value of the steel billet; according to the shape data of the steel billet, judging whether the steel billet is a wedge-shaped defect, wherein when the steel billet shape data is poor When the profile data of the steel billet shows that the thicknesses on both sides of one of the steel billets in the width direction are unequal, it is judged that the billet is wedge-shaped bad; Whether the difference between the width value and the steel blank width value is greater than a cutting amount threshold; when the difference between the steel blank's target width value after rolling and the steel blank width value is not greater than the cutting amount threshold value, modify the the target width value after rolling, wherein the target width value after rolling after modification is smaller than the width value of steel billet, and the difference between the target width value after rolling rolling after modification and the width value of steel billet is greater than the cutting amount and performing a trimming process on the steel billet according to the modified target width value after rolling, wherein the trimming process adopts a groove-shaped trimming roller. The rolling method for a wedge-shaped steel billet as claimed in claim 1, further comprising using a side guide to perform a side edge correction process on the steel billet after edge trimming, wherein the side edge correction process is for the side edge correction process after edge trimming. The billet applies a clamping pressure. The rolling method for a wedge-shaped steel billet as claimed in claim 2, wherein the clamping pressure is greater than 4.5 tons. The rolling method for a wedge-shaped steel billet as claimed in claim 1 further comprises: performing a horizontal rolling process on the steel billet. The rolling method for a wedge-shaped billet as claimed in claim 4, wherein the horizontal rolling process comprises: calculating a roll horizontal inclination amount according to a roll length of the horizontal roll and the profile data of the billet; and according to the roll level The inclination amount of a horizontal roll is adjusted to use the horizontal roll to roll the steel billet. A rolling system for wedge-shaped steel billets, comprising: a vertical rolling mill, wherein the vertical rolling mill includes groove-shaped trimming rolls; a billet width measuring device; and a rolling control system for: obtaining a billet shape data , wherein the shape data of the steel billet includes a width value of the steel billet; according to the shape data of the steel billet, it is judged whether the steel billet is a wedge-shaped defect. When the height is equal, it is judged that the steel billet is wedge-shaped bad; when the steel billet is wedge-shaped bad, it is judged whether the difference between the target width value after rolling of one of the steel billets and the steel billet width value is greater than a reduction valve value; the difference between the target width value of the billet after rolling and the billet width value When the value is not greater than the cutting amount threshold, modify the target width value after rolling, wherein the target width value after rolling after modification is less than the width value of the billet, and the target width value after rolling after modification is the same as the target width value after rolling. The difference between the steel billet width values is greater than the cutting amount threshold; and according to the modified target width value after rolling, the vertical rolling mill is used to perform a trimming process on the steel billet, and the steel billet width measuring device is used To measure the width of the steel blank, the edge trimming process adopts a grooved edge trimming roller. The rolling system for the wedge-shaped steel billet as claimed in claim 6, further comprising: a side guide for performing a side edge correction process on the steel billet after edge trimming, wherein the side edge correction process is for the edge trimming process. A clamping pressure is applied to the steel blank. The rolling system for wedge-shaped steel billets as claimed in claim 7, wherein the clamping pressure is greater than 4.5 tons. The rolling system for wedge-shaped steel billets as claimed in claim 6 further comprises a horizontal rolling mill, wherein the rolling control system is further used for: controlling the horizontal rolling mill to perform a horizontal rolling process on the steel billets. The rolling system for wedge-shaped billets as claimed in claim 9, wherein the horizontal rolling process comprises: Calculate the horizontal inclination of a roll according to the length of one of the horizontal rolls and the shape data of the steel billet; and adjust the inclination of a horizontal roll of the horizontal rolling mill according to the horizontal inclination of the roll, so as to use the horizontal roll to Steel billets are rolled.

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