Determination method and device for damaged working roll, equipment and medium

Abstract

The invention discloses a method and device for determining a damaged working roll, equipment and a medium. The method comprises the following steps of: determining a target rack with larger elongation in two target racks of the rolling mill as a first rack, and determining a target rack with smaller elongation in the two target racks as a second rack; the working roller on the first rack is replaced with a working roller with a first roller diameter and / or the working roller on the second rack is replaced with a working roller with a second roller diameter, after replacement, the roller diameter of the working roller on the first rack is recorded as a first new roller diameter, and the roller diameter of the working roller on the second rack is recorded as a second new roller diameter, the first new roller diameter is larger than the second new roller diameter, or a second difference value obtained by subtracting the first new roller diameter from the second new roller diameter is larger than a preset second difference value threshold value; obtaining the actual roll mark length of the strip steel; and determining the damaged working roll according to the first new roll diameter, the second new roll diameter, the elongation percentage and the actual roll mark length. By means of the method, which rack is provided with the damaged working roller can be accurately determined.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to a method, device, equipment and medium for determining a damaged working roll. Background Art

[0002] During the production process of strip steel on the rolling production line, residues such as sludge that falls onto the strip steel or is brought into the roll gap can easily damage the working rolls. When the damaged working rolls process the strip steel, roll mark defects will appear on the surface of the strip steel.

[0003] At present, when roller mark defects appear on the strip surface, the working roll that may be damaged will be determined based on the theoretical roller mark length of the working roll and the actual roller mark length of the strip. The damaged working roll will be replaced so that no roller mark will appear on the strip surface.

[0004] However, the theoretical roll mark lengths of some work rolls are very close, which makes it difficult to determine which work roll is damaged among the work rolls with similar theoretical roll mark lengths. Therefore, all work rolls that may be damaged have to be replaced, resulting in increased roll consumption costs. Therefore, how to accurately determine which work roll is damaged is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide a method, device, equipment and medium for determining damaged working rolls that solve the above problems. The working rolls on at least one of the two target frames with similar old theoretical roll mark lengths can be replaced with working rolls of the first roll diameter or the second roll diameter. The difference between the new theoretical roll mark lengths of the two target frames after replacement will become larger, so that the working roll on which frame is damaged can be accurately determined based on the new roll diameter and elongation of the target frame and the actual roll mark length of the strip.

[0006] In a first aspect, the present invention provides a method for determining a damaged working roll, the method comprising:

[0007] Determine that the target frame with a larger elongation rate among the two target frames of the rolling mill is the first frame, and the target frame with a smaller elongation rate among the two target frames is the second frame, and the two target frames are two frames whose first difference between two old theoretical roll print lengths is less than a preset first difference threshold value;

[0008] The working rolls on the first stand are replaced with working rolls with a first roll diameter and / or the working rolls on the second stand are replaced with working rolls with a second roll diameter. After the replacement, the roll diameters of the working rolls on the first stand are recorded as first new roll diameters, and the roll diameters of the working rolls on the second stand are recorded as second new roll diameters, wherein the first new roll diameter is greater than the second new roll diameter, or a second difference between the second new roll diameter and the first new roll diameter is greater than a preset second difference threshold;

[0009] Get the actual roller printing length of the strip;

[0010] A damaged working roll is determined according to the first new roll diameter, the second new roll diameter, the elongation rate and the actual roll mark length.

[0011] Optionally, the rolling mill is a five-stand six-roller rolling mill.

[0012] Optionally, determining the damaged working roll according to the first new roll diameter, the second new roll diameter, the elongation and the actual roll mark length includes:

[0013] Calculating a first new theoretical roller printing length of the first frame according to the first new roller diameter and the elongation of the first frame, and calculating a second new theoretical roller printing length of the second frame according to the second new roller diameter and the elongation of the second frame;

[0014] The damaged working roll is determined according to the first new theoretical roll mark length, the second new theoretical roll mark length and the actual roll mark length.

[0015] Optionally, the calculating a first new theoretical roller print length of the first frame according to the first new roller diameter and the elongation of the first frame, and the calculating a second new theoretical roller print length of the second frame according to the second new roller diameter and the elongation of the second frame, comprises:

[0016] Calculate the product of the first new roller diameter, the elongation of the first frame and π to obtain a first new theoretical roller print length of the first frame;

[0017] The product of the second new roller diameter, the elongation of the second frame and π is calculated to obtain the second new theoretical roller printing length of the second frame.

[0018] Optionally, determining the damaged working roll according to the first new theoretical roll mark length, the second new theoretical roll mark length and the actual roll mark length includes:

[0019] Obtaining old theoretical roll print lengths of other frames of the rolling mill, where the other frames are frames excluding the two target frames from all frames of the rolling mill;

[0020] Calculating third differences between the old theoretical roller printing length of the other frames, the first new theoretical roller printing length, the second new theoretical roller printing length and the actual roller printing length;

[0021] The working roll on the frame corresponding to the frame for which the third difference is smaller than a preset third difference threshold is determined as the damaged working roll.

[0022] Optionally, before determining that the target frame with a larger elongation among the two target frames of the rolling mill is the first frame and the target frame with a smaller elongation among the two target frames is the second frame, the method further includes:

[0023] Get the thickness tolerance of the strip tail;

[0024] The first difference threshold is determined according to the excess thickness of the tape tail.

[0025] Optionally, before replacing the working rolls on the first stand with working rolls of a first roll diameter and / or replacing the working rolls on the second stand with working rolls of a second roll diameter, the method further includes:

[0026] The second difference threshold is determined according to the first difference threshold.

[0027] In a second aspect, the present invention provides a device for determining a damaged working roll, the device comprising:

[0028] A first determination module is used to determine that the target frame with a larger elongation rate among the two target frames of the rolling mill is the first frame, and the target frame with a smaller elongation rate among the two target frames is the second frame, and the two target frames are two frames whose first difference between two old theoretical roll print lengths is less than a preset first difference threshold;

[0029] a replacement module, used for replacing the working rolls on the first frame with working rolls of a first roll diameter and / or replacing the working rolls on the second frame with working rolls of a second roll diameter, after which the roll diameters of the working rolls on the first frame are recorded as first new roll diameters, and the roll diameters of the working rolls on the second frame are recorded as second new roll diameters, wherein the first new roll diameter is greater than the second new roll diameter, or a second difference between the second new roll diameter and the first new roll diameter is greater than a preset second difference threshold;

[0030] An acquisition module is used to acquire the actual roller-printed length of the strip;

[0031] The second determination module is used to determine the damaged working roll according to the first new roll diameter, the second new roll diameter, the elongation rate and the actual roll mark length.

[0032] In a third aspect, the present invention provides an electronic device comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method described in the first aspect by executing the computer instructions.

[0033] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the method described in the first aspect.

[0034] The technical solution provided in the embodiments of the present invention has at least the following technical effects or advantages:

[0035] The embodiment of the present invention provides a method, device, equipment and medium for determining a damaged working roll, which determines that the target stand with a larger elongation among the two target stands of a rolling mill is the first stand, and the target stand with a smaller elongation among the two target stands is the second stand, and the two target stands are two stands whose first difference between the two old theoretical roll print lengths is less than a preset first difference threshold, that is, the two stands whose two old theoretical roll print lengths are close are distinguished according to the elongation; the working rolls on the first stand are replaced with working rolls of the first roll diameter and / or the working rolls on the second stand are replaced with working rolls of the second roll diameter, that is, at least one working roll of the target stand is replaced, and after the replacement, the working rolls of the first stand are replaced. The roller diameter of the working roller on the frame is recorded as the first new roller diameter, and the roller diameter of the working roller on the second frame is recorded as the second new roller diameter, wherein the first new roller diameter is greater than the second new roller diameter, or the second difference of the second new roller diameter minus the first new roller diameter is greater than the preset second difference threshold, so that the difference in the new theoretical roller mark length of the two target frames after replacement becomes larger, and large enough to distinguish the difference between the two; then the actual roller mark length of the strip is obtained to understand the actual roller mark on the strip; according to the first new roller diameter, the second new roller diameter, the elongation and the actual roller mark length, the damaged working roller is determined, and when the strip has a roller mark defect after replacement, it can accurately distinguish which working roller on which frame is damaged. This method can accurately determine the damaged working roller, so that the damaged working roller can be replaced, while eliminating the roller mark defect of the strip, it can also reduce the roller consumption cost.

[0036] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0038] Figure 1 is a flow chart of a method for determining a damaged working roll provided by an embodiment of the present invention;

[0039] Figure 2 It is a schematic diagram of the roll diameter of a working roll of a five-stand six-roller rolling mill provided by an embodiment of the present invention;

[0040] Figure 3 It is a schematic diagram of an old theoretical roll print length of a five-stand six-roller rolling mill provided by an embodiment of the present invention;

[0041] Figure 4 It is a schematic diagram of the roll diameter of a five-stand six-roller rolling mill after the working rolls are replaced provided by an embodiment of the present invention;

[0042] Figure 5 It is a schematic diagram of a new theoretical roll mark length after the working rolls of a five-stand six-roller rolling mill are replaced according to an embodiment of the present invention;

[0043] Figure 6 This is a structural block diagram of a device for determining a damaged working roll provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0045] Figure 1 : is a flow chart of a method for determining a damaged working roll provided by an embodiment of the present invention, such as Figure 1 As shown, the method includes:

[0046] Step S110: Determine that the target frame with a larger elongation rate among the two target frames of the rolling mill is the first frame, and the target frame with a smaller elongation rate among the two target frames is the second frame.

[0047] The two target racks are two racks whose first difference between two old theoretical roller printing lengths is less than a preset first difference threshold.

[0048] It can be understood that the old theoretical roll mark lengths of the two target racks are very close, and the actual roll mark lengths of the strip are close to the old theoretical roll mark lengths of the two target racks, indicating that the roll mark may be generated by the working rolls on the two target racks, but because the old theoretical roll mark lengths of the two target racks are very close, it is difficult to determine which working roll on which target rack the roll mark is generated. If the first difference between the two old theoretical roll mark lengths is greater than or equal to the first difference threshold, it means that the two old theoretical roll mark lengths are significantly different, and the actual roll mark length will not be close to the two old theoretical roll mark lengths at the same time, so it will be easy to distinguish which working roll on which target rack the roll mark defect is generated.

[0049] In this embodiment, if the working roll is damaged, one roll mark will be generated when the working roll rotates one circle, so the theoretical roll mark length can be calculated according to the following formula:

[0050] L = π*D*(1+δ ) Formula (1);

[0051] Where L represents the theoretical roll mark length, D represents the roll diameter of the working roll on the frame, and δ represents the elongation of the frame. Then, the old theoretical roll mark length L1 = π*D1*(1+δ), and D1 represents the old roll diameter of the working roll on the frame before replacement.

[0052] It can be seen from formula (1) that the theoretical roll mark length is related to the roll diameter and elongation. When producing strip steel, the elongation of each stand is basically constant. Therefore, if you want to make the theoretical roll mark lengths of the two target stands different and have a certain gap, you can only achieve it by changing the roll diameter of the working roll. Therefore, at this time, you need to distinguish the target stands according to the elongation, and then determine how many roll diameters the working rolls on the target stands should be replaced with.

[0053] Among them, the elongation can be obtained from the control system of the rolling mill.

[0054] Optionally, the rolling mill is a five-stand six-high rolling mill.

[0055] In this embodiment, the method for determining damaged working rolls is more suitable for a five-stand six-roller rolling mill, and of course can also be applied to other rolling mills.

[0056] In this embodiment, the pickling production line rolling mill in the pickling operation area of ​​the cold rolling department generally adopts a five-stand six-roller UCM (Utility Crown Mill) rolling mill of Mitsubishi Hitachi. Figure 2 Schematic diagram of the roll diameter of a working roll of a five-stand six-roller rolling mill provided by an embodiment of the present invention. Figure 3 Schematic diagram of the old theoretical roll print length of a five-stand six-roller mill provided by an embodiment of the present invention, such as Figure 2As shown in the dotted box, the diameter of the work roll (WR) on the No. 4 stand and the No. 5 stand of the five-stand six-high rolling mill differs by about 10 mm, and the elongation is also not much different, so Figure 3 As shown in the dotted box, the old theoretical roll mark lengths of the working rolls on the No. 4 and No. 5 frames are very close. When the actual roll mark length on the strip is almost the same as the old theoretical roll mark lengths of the No. 4 and No. 5 frames, it is difficult to distinguish whether the roll mark is caused by the working rolls on the No. 4 or No. 5 frames.

[0057] Moreover, due to the extremely high quality requirements for cold-rolled sheets, even very slight defects on the surface of cold-rolled strips are not allowed. These slight defects are caused by damage on the surface of the working rolls that is difficult to detect, so the difficulty of identifying damaged working rolls is increased again. In the end, the only way to accurately identify damaged working rolls is to increase the difference between the theoretical roll mark lengths of the No. 4 and No. 5 stands.

[0058] Step S120, replacing the working rolls on the first frame with working rolls of the first roll diameter and / or replacing the working rolls on the second frame with working rolls of the second roll diameter. After the replacement, the roll diameter of the working rolls on the first frame is recorded as the first new roll diameter, and the roll diameter of the working rolls on the second frame is recorded as the second new roll diameter, wherein the first new roll diameter is greater than the second new roll diameter, or a second difference between the second new roll diameter and the first new roll diameter is greater than a preset second difference threshold.

[0059] In this embodiment, the working roller on at least one of the two target racks can be replaced to increase the difference between the theoretical roller print lengths of the two target racks. The roller diameter of the working roller on the first rack before the replacement is recorded as the first old roller diameter, and the roller diameter of the working roller on the second rack before the replacement is recorded as the second old roller diameter.

[0060] Specifically, since the old theoretical roll print lengths of the two target frames are close, and the elongation of the first frame is greater than the elongation of the second frame, the first old roll diameter is smaller than the second old roll diameter. If only the working roll on the first frame is replaced with a working roll with the first roll diameter, and the working roll on the second frame is not replaced, the first new roll diameter is the first roll diameter, and the second new roll diameter is still the second old roll diameter. Therefore, the working roll of the first frame can be replaced with a working roll larger than the second old roll diameter, so that the first new roll diameter is larger than the second new roll diameter, so that the theoretical roll print length of the first frame after replacement (i.e., the new theoretical roll print length of the first frame) is much larger than the old theoretical roll print length of the second working roll. Alternatively, the working roll of the first frame is replaced with a working roll with a roll diameter much smaller than the first old roll diameter, so that the second difference between the second new roll diameter and the first new roll diameter is greater than the preset second difference threshold, so that the new theoretical roll print length of the first frame is much smaller than the old theoretical roll print length of the second frame.

[0061] If only the working rolls of the second frame are replaced with working rolls of the second roll diameter, and the working rolls of the first frame are not replaced, the first new roll diameter is still the first old roll diameter, and the second new roll diameter is the second roll diameter. Therefore, the working rolls of the second frame can be replaced with working rolls with a roll diameter smaller than the first old roll diameter, so that the first new roll diameter is larger than the second new roll diameter, so that the theoretical roll print length of the second frame after replacement (i.e., the new theoretical roll print length of the second frame) is much smaller than the old theoretical roll print length of the first frame. Alternatively, the working rolls of the second frame are replaced with working rolls with a roll diameter larger than the second old roll diameter, so that the second difference between the second new roll diameter and the first new roll diameter is greater than the second difference threshold, so that the new theoretical roll print length of the second frame is much larger than the old theoretical roll print length of the first frame.

[0062] If the first working roll is replaced with a working roll of the first roll diameter, and the second working roll is replaced with a working roll of the second roll diameter, the first new roll diameter is the first roll diameter, and the second new roll diameter is the second roll diameter. Therefore, in order to widen the gap between the theoretical roll print lengths of the two target racks, it is necessary to make the first new roll diameter larger than the second new roll diameter, so that the new theoretical roll print length of the first rack is much larger than the new theoretical roll print length of the second rack; or make the second difference between the second new roll diameter and the first new roll diameter larger than the preset second difference threshold, so that the new theoretical roll print length of the first rack is much smaller than the new theoretical roll print length of the second rack.

[0063] Therefore, by replacing the working rolls according to the method in step S120, the difference between the new theoretical roll mark length of the first frame and the new theoretical roll mark length of the second frame can be greater than the first difference threshold.

[0064] It should be noted that if the old theoretical roll print lengths of three frames in the rolling mill are close, and these three frames are respectively recorded as the first target frame, the second target frame and the third target frame, then the first target frame and the second target frame are first selected as the final two target frames, and then the working rolls of the two target frames are replaced according to the above method, so that the first difference between the new theoretical roll print lengths of the two target frames is greater than the first difference threshold, and then the roll diameter of the working roll on the third frame is adjusted. If only the working roll of one of the first target frame and the second target frame is replaced during the first replacement, then during the second replacement, the target frame that was not replaced for the first time and the third frame can be used as the final target frame, and then the working roll on the third frame is replaced, so that the first difference between the new theoretical roll print lengths of the second frame and the third frame is greater than the first difference threshold, and at the same time, it is also necessary to ensure that the first difference between the new theoretical roll print length of the first frame and the new theoretical roll print length of the third frame is greater than the first difference threshold. Among them, the selection of which target frame's working roll to replace can be determined according to the actual situation, as long as the final first difference is greater than the first difference threshold.

[0065] Although in actual production it is impossible for three or more rolling mills to have similar old theoretical roll mark lengths, if this happens and the elongation cannot be changed, the method in this embodiment can be used to replace the working rolls of the target frame, so that the difference between any two old theoretical roll mark lengths is greater than the first difference threshold.

[0066] Optionally, before step S110, the method further includes:

[0067] The tail thickness tolerance of the strip is obtained; and a first difference threshold is determined according to the tail thickness tolerance.

[0068] The excess thickness of the strip tail indicates that the thickness of the strip tail exceeds the standard thickness range, and the standard thickness range is the target thickness range of the strip processing. Specifically, the strip tail thickness can be detected in real time by the detection equipment, and the difference between the strip tail thickness and the upper limit or lower limit of the standard thickness range can be calculated to obtain the excess thickness of the strip tail.

[0069] In this embodiment, since the excess thickness of the strip tail will affect the actual roll printing length, the first difference threshold can be determined according to the excess thickness of the strip tail. The larger the excess thickness of the strip tail, the larger the first difference threshold; conversely, the smaller the excess thickness of the strip tail, the smaller the first difference threshold. For example, according to the excess thickness data of the strip tail of the five-stand six-roll mill, the first difference threshold is determined to be 20mm.

[0070] Optionally, before step S120, the method further includes:

[0071] A second difference threshold is determined according to the first difference threshold.

[0072] It can be understood that it is necessary to determine how much smaller the first new roller diameter is than the second new roller diameter so that the new theoretical roll mark length of the first working roller is at least smaller than the new theoretical roll mark length of the second working roller by the first difference threshold, thereby making the difference between the new theoretical roll mark length of the first working roller and the new theoretical roll mark length of the second working roller large enough. Specifically, the minimum second difference threshold can be inferred through formula (1).

[0073] For example, the first old roll diameter of the working roll on the first stand of a rolling mill is 800 mm, the elongation of the first stand is 0.2, the second old roll diameter of the working roll on the second stand is 810 mm, and the elongation of the second stand is 0.185. By formula (1), it can be calculated that the old theoretical roll print lengths of the first stand and the second stand are both close to 3014 mm. If the first difference threshold is 20 mm, then (3014-20) / (3.14*1.2)≈794 (mm), so the minimum value of the second difference threshold can be 810-794=16 (mm).

[0074] In this embodiment, if the first difference threshold is 20 mm, then according to the distribution characteristics of the elongation of the five-stand six-high rolling mill, it can be determined that the second difference threshold is 20 mm.

[0075] Step S130, obtaining the actual roller-marked length of the steel strip.

[0076] In this embodiment, when a roll mark defect occurs on the strip, it is necessary to find which working roll on which stand has the defect based on the actual roll mark length of the strip. The actual roll mark length can be detected in real time by the detection device, and the detection result is sent to the control system of the rolling mill, and then the actual roll mark length is obtained from the control system.

[0077] Step S140: determining the damaged working roll according to the first new roll diameter, the second new roll diameter, the elongation and the actual roll mark length.

[0078] In this embodiment, the working rolls of the target frame have been replaced with working rolls whose roll diameters meet the requirements, so it is now possible to determine which working roll on which frame is damaged based on the roll diameter and elongation of the replaced working rolls and the actual roll mark length.

[0079] Optionally, step S140 includes:

[0080] The first step is to calculate the first new theoretical roller printing length of the first frame according to the first new roller diameter and the elongation of the first frame, and calculate the second new theoretical roller printing length of the second frame according to the second new roller diameter and the elongation of the second frame.

[0081] It can be understood that the roll diameter of the working roll on the target frame has changed. According to formula (1), the theoretical roll mark length of the target frame after the working roll is replaced will also change accordingly. Therefore, it is necessary to recalculate the new theoretical roll mark length of the target frame.

[0082] Optionally, the first step includes:

[0083] The product of the first new roller diameter, the elongation of the first frame and π is calculated to obtain the first new theoretical roller printing length of the first frame; the product of the second new roller diameter, the elongation of the second frame and π is calculated to obtain the second new theoretical roller printing length of the second frame.

[0084] In this embodiment, the roller diameter in the above formula (1) is replaced by the first new roller diameter, and the elongation is replaced by the elongation of the first frame, so that the new theoretical roller printing length of the first frame can be calculated. Similarly, the roller diameter in the above formula (1) is replaced by the second new roller diameter, and the elongation is replaced by the elongation of the second frame, so that the new theoretical roller printing length of the second frame can be calculated.

[0085] The second step is to determine the damaged working roll according to the first new theoretical roll mark length, the second new theoretical roll mark length and the actual roll mark length.

[0086] In this embodiment, after the replacement, the difference between the new theoretical roll mark lengths of the two target frames is large enough, so combined with the actual roll mark length, it can be determined which target frame has a damaged working roll.

[0087] Optionally, the second step includes:

[0088] Obtain old theoretical roll mark lengths of other frames of the rolling mill, where other frames are frames excluding two target frames from all frames of the rolling mill; calculate the third differences between the old theoretical roll mark lengths of other frames, the first new theoretical roll mark lengths, and the second new theoretical roll mark lengths and the actual roll mark lengths; and determine the working rolls on the frames corresponding to the frames whose third difference is less than a preset third difference threshold as damaged working rolls.

[0089] It can be understood that if the roller mark is produced by the working rollers on two target frames, then based on the third difference between the first new theoretical roller mark length and the second new theoretical roller mark length and the actual roller mark length respectively, it can be determined which target frame's working roller is damaged, that is, which target frame's third difference is less than the third difference threshold, then the target frame's working roller is damaged.

[0090] If the roller mark is not produced by the working rollers on the two target frames, it is possible to determine which working roller on the other frames is damaged based on the third difference between the old theoretical roller mark length and the actual roller mark length of the other frames, that is, the working roller on whichever other frame has the damaged working roller is smaller than the third difference threshold.

[0091] It should be noted that, it is also possible to infer which working roll on which frame is damaged based on the actual roll mark length. Specifically, the actual roll mark length is divided by π and then divided by the elongation of a certain frame to obtain a predicted roll diameter. If the difference between the predicted roll diameter and the roll diameter of the working roll on the certain frame is less than a preset fourth difference threshold, it means that the working roll on the certain frame is damaged.

[0092] Figure 4 Schematic diagram of the roll diameter of a five-stand six-roller mill after the working rolls are replaced, as shown in FIG. Figure 4 As shown in the dotted box, after replacement, the roll diameter of the working roll on the No. 4 stand is larger than the roll diameter of the working roll on the No. 5 stand; Figure 5 Schematic diagram of a new theoretical roll mark length of a five-stand six-roller mill after replacing the working rolls provided by an embodiment of the present invention, such as Figure 5 As shown in the dotted box, after the replacement, the difference between the new theoretical roller printing lengths of the No. 4 frame and the No. 5 frame became significantly larger.

[0093] Using the method in this embodiment to determine the damaged working rolls can not only reduce production costs, but also increase production capacity. For example, according to the frequency of roll mark defects on site, the problem of close theoretical roll mark length occurs 4 times a month on average. After replacing the working rolls of the racks with close theoretical roll mark lengths, one working roll can be saved each time the rolls are replaced, and 4 working rolls can be saved in one month. Based on the grinding cost of each roll of 2,000 yuan, the grinding cost of the roll can be saved every year, 4*2000*12=96,000 yuan / year.

[0094] At the same time, the frame that causes the roller mark can be directly and accurately determined based on the theoretical roller mark length and the actual roller mark length, which not only saves the time of stopping the machine to check the damaged roller, but also saves roller consumption, reduces the difficulty of operation, and reduces the possibility of misjudgment of the operation. Saving 10 minutes of inspection time each time can save 40 minutes of production time per month. Based on the average production capacity of 300 tons / hour, the annual cumulative capacity saving is 8*300=2400 tons, the benefit per ton is 500 yuan, and the annual saving benefit is 1.2 million yuan, creating a total benefit of 1.2 million + 9.6 = 1.296 million yuan.

[0095] The method in this embodiment can be applied not only to the working rolls in the rolling mill, but also to the steering rolls of the production line to check for roll marks on the strip caused by foreign matter attached to the rolls, thereby significantly improving the inspection efficiency.

[0096] Based on the same inventive concept, an embodiment of the present invention further provides a device for determining a damaged working roll. Figure 6 is a structural block diagram of a device for determining a damaged working roll provided by an embodiment of the present invention, such as Figure 6 As shown, the device 600 includes

[0097] A first determination module is used to determine that the target frame with a larger elongation rate among the two target frames of the rolling mill is the first frame, and the target frame with a smaller elongation rate among the two target frames is the second frame, and the two target frames are two frames whose first difference between two old theoretical roll print lengths is less than a preset first difference threshold;

[0098] a replacement module, used for replacing the working rolls on the first frame with working rolls of a first roll diameter and / or replacing the working rolls on the second frame with working rolls of a second roll diameter, after which the roll diameters of the working rolls on the first frame are recorded as first new roll diameters, and the roll diameters of the working rolls on the second frame are recorded as second new roll diameters, wherein the first new roll diameter is greater than the second new roll diameter, or a second difference between the second new roll diameter and the first new roll diameter is greater than a preset second difference threshold;

[0099] An acquisition module is used to acquire the actual roller-printed length of the strip;

[0100] The second determination module is used to determine the damaged working roll according to the first new roll diameter, the second new roll diameter, the elongation rate and the actual roll mark length.

[0101] Optionally, the rolling mill is a five-stand six-high rolling mill.

[0102] Optionally, the second determining module includes:

[0103] a calculation unit, configured to calculate a first new theoretical roller print length of the first frame according to the first new roller diameter and the elongation of the first frame, and to calculate a second new theoretical roller print length of the second frame according to the second new roller diameter and the elongation of the second frame;

[0104] A determination unit is used to determine the damaged working roller according to the first new theoretical roller mark length, the second new theoretical roller mark length and the actual roller mark length.

[0105] Optionally, the computing unit is further configured to:

[0106] Calculate the product of the first new roller diameter, the elongation of the first frame and π to obtain a first new theoretical roller print length of the first frame;

[0107] The product of the second new roller diameter, the elongation of the second frame and π is calculated to obtain the second new theoretical roller printing length of the second frame.

[0108] Optionally, the determining unit is further configured to:

[0109] Obtaining old theoretical roll print lengths of other frames of the rolling mill, where the other frames are frames excluding the two target frames from all frames of the rolling mill;

[0110] Calculating third differences between the old theoretical roller printing length of the other frames, the first new theoretical roller printing length, the second new theoretical roller printing length and the actual roller printing length;

[0111] The working roll on the frame corresponding to the frame for which the third difference is smaller than a preset third difference threshold is determined as the damaged working roll.

[0112] Optionally, the device further includes a third determining module, configured to:

[0113] Get the thickness tolerance of the strip tail;

[0114] The first difference threshold is determined according to the excess thickness of the tape tail.

[0115] Optionally, the device further includes a fourth determining module, configured to:

[0116] The second difference threshold is determined according to the first difference threshold.

[0117] It can be understood that the device provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0118] An embodiment of the present invention further provides an electronic device, which may include a processor and a memory, wherein the processor and the memory may be communicatively connected to each other via a bus or other means.

[0119] The processor may be a central processing unit (CPU) or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0120] The memory may include a large capacity memory for data or instructions. By way of example and not limitation, the memory may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. Where appropriate, the memory may include a removable or non-removable (or fixed) medium. Where appropriate, the memory may be inside or outside the electronic device. In a particular embodiment, the memory may be a non-volatile solid-state memory.

[0121] In one example, the memory may be a read-only memory (ROM). In one example, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0122] The processor implements any one of the methods for determining a damaged working roll in the above embodiments by reading and executing computer program instructions stored in the memory.

[0123] In one example, the electronic device may further include a communication interface and a bus. Among them, the processor, memory, and communication interface are connected through a bus and communicate with each other. The communication interface is mainly used to realize the communication between the modules, devices, units and / or devices in the embodiment of the present application. Where appropriate, the bus may include one or more buses.

[0124] In addition, in combination with the method for determining a damaged working roll in the above embodiment, an embodiment of the present invention may provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by a processor, any method for determining a damaged working roll in the above embodiment is implemented.

[0125] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0126] The embodiment of the present invention provides a method, device, equipment and medium for determining a damaged working roll, which determines that the target stand with a larger elongation among the two target stands of a rolling mill is the first stand, and the target stand with a smaller elongation among the two target stands is the second stand, and the two target stands are two stands whose first difference between the two old theoretical roll print lengths is less than a preset first difference threshold, that is, the two stands whose two old theoretical roll print lengths are close are distinguished according to the elongation; the working rolls on the first stand are replaced with working rolls of the first roll diameter and / or the working rolls on the second stand are replaced with working rolls of the second roll diameter, that is, at least one working roll of the target stand is replaced, and after the replacement, the working rolls of the first stand are replaced. The roller diameter of the working roller on the frame is recorded as the first new roller diameter, and the roller diameter of the working roller on the second frame is recorded as the second new roller diameter, wherein the first new roller diameter is greater than the second new roller diameter, or the second difference of the second new roller diameter minus the first new roller diameter is greater than the preset second difference threshold, so that the difference in the new theoretical roller mark length of the two target frames after replacement becomes larger, and large enough to distinguish the difference between the two; then the actual roller mark length of the strip is obtained to understand the actual roller mark on the strip; according to the first new roller diameter, the second new roller diameter, the elongation and the actual roller mark length, the damaged working roller is determined, and when the strip has a roller mark defect after replacement, it can accurately distinguish which working roller on which frame is damaged. This method can accurately determine the damaged working roller, so that the damaged working roller can be replaced, while eliminating the roller mark defect of the strip, it can also reduce the roller consumption cost.

[0127] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0128] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0129] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "one" or "an" preceding a component does not exclude the presence of a plurality of such components. The present invention may be implemented by means of hardware comprising a number of different components and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

Claims

1. A method for determining a damaged working roll, characterized in that: The method comprises: Determine that the target frame with a larger elongation rate among the two target frames of the rolling mill is the first frame, and the target frame with a smaller elongation rate among the two target frames is the second frame, and the two target frames are two frames whose first difference between two old theoretical roll print lengths is less than a preset first difference threshold value; The working rolls on the first stand are replaced with working rolls with a first roll diameter and / or the working rolls on the second stand are replaced with working rolls with a second roll diameter. After the replacement, the roll diameters of the working rolls on the first stand are recorded as first new roll diameters, and the roll diameters of the working rolls on the second stand are recorded as second new roll diameters, wherein the first new roll diameter is greater than the second new roll diameter, or a second difference between the second new roll diameter and the first new roll diameter is greater than a preset second difference threshold; Get the actual roller printing length of the strip; A damaged working roll is determined according to the first new roll diameter, the second new roll diameter, the elongation rate and the actual roll mark length.

2. The method for determining a damaged work roll according to claim 1, characterized in that: The rolling mill is a five-stand six-roller rolling mill.

3. The method for determining a damaged work roll according to claim 1, characterized in that: The step of determining a damaged working roll according to the first new roll diameter, the second new roll diameter, the elongation rate and the actual roll mark length includes: Calculating a first new theoretical roller printing length of the first frame according to the first new roller diameter and the elongation of the first frame, and calculating a second new theoretical roller printing length of the second frame according to the second new roller diameter and the elongation of the second frame; The damaged working roll is determined according to the first new theoretical roll mark length, the second new theoretical roll mark length and the actual roll mark length.

4. The method for determining a damaged working roll according to claim 3, characterized in that: The method of calculating a first new theoretical roller printing length of the first frame according to the first new roller diameter and the elongation rate of the first frame, and calculating a second new theoretical roller printing length of the second frame according to the second new roller diameter and the elongation rate of the second frame, comprises: Calculate the product of the first new roller diameter, the elongation of the first frame and π to obtain a first new theoretical roller print length of the first frame; The product of the second new roller diameter, the elongation of the second frame and π is calculated to obtain the second new theoretical roller printing length of the second frame.

5. The method for determining a damaged working roll according to claim 3, characterized in that: The step of determining the damaged working roll according to the first new theoretical roll mark length, the second new theoretical roll mark length and the actual roll mark length comprises: Obtaining old theoretical roll print lengths of other frames of the rolling mill, where the other frames are frames excluding the two target frames from all frames of the rolling mill; Calculating third differences between the old theoretical roller printing length of the other frames, the first new theoretical roller printing length, the second new theoretical roller printing length and the actual roller printing length; The working roll on the frame corresponding to the frame for which the third difference is smaller than a preset third difference threshold is determined as the damaged working roll.

6. The method for determining a damaged working roll according to claim 1, characterized in that: Before determining that the target frame with a larger elongation among the two target frames of the rolling mill is the first frame and the target frame with a smaller elongation among the two target frames is the second frame, the method further includes: Get the thickness tolerance of the strip tail; The first difference threshold is determined according to the excess thickness of the tape tail.

7. The method for determining a damaged work roll according to claim 1, characterized in that: Before replacing the working rolls on the first stand with working rolls of a first roll diameter and / or replacing the working rolls on the second stand with working rolls of a second roll diameter, the method further includes: The second difference threshold is determined according to the first difference threshold.

8. A device for determining a damaged working roll, characterized in that: The device comprises: A first determination module is used to determine that the target frame with a larger elongation rate among the two target frames of the rolling mill is the first frame, and the target frame with a smaller elongation rate among the two target frames is the second frame, and the two target frames are two frames whose first difference between two old theoretical roll print lengths is less than a preset first difference threshold; a replacement module, used for replacing the working rolls on the first frame with working rolls of a first roll diameter and / or replacing the working rolls on the second frame with working rolls of a second roll diameter, after which the roll diameters of the working rolls on the first frame are recorded as first new roll diameters, and the roll diameters of the working rolls on the second frame are recorded as second new roll diameters, wherein the first new roll diameter is greater than the second new roll diameter, or a second difference between the second new roll diameter and the first new roll diameter is greater than a preset second difference threshold; An acquisition module is used to acquire the actual roller-printed length of the strip; The second determination module is used to determine the damaged working roll according to the first new roll diameter, the second new roll diameter, the elongation rate and the actual roll mark length.

9. An electronic device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method according to any one of claims 1 to 7 by executing the computer instructions.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to cause the computer to execute the method according to any one of claims 1 to 7.

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