Production control method, device and equipment for tandem cold rolling mill

Abstract

The present invention discloses a production control method, device and equipment for a tandem cold rolling mill unit. The tandem cold rolling mill unit includes a rolling mill, and the rolling mill includes a plurality of stands. The method includes: when the rolling mill rolls a first strip steel, obtaining a detection distance between a weld seam and the entrance of the rolling mill, the weld seam being located between the first strip steel and a second strip steel, and the width of the first strip steel being greater than that of the second strip steel; if the detection distance is within a preset distance range, controlling the rolling mill to stop, and replacing rolls for each of the plurality of stands to match the production conditions of the first strip steel; in response to a roll change completion signal, controlling the rolling mill to start up; when the rolling mill starts up, for some of the plurality of stands, determining the current rolling force of the stand based on the first rolling force setting value of the stand and a preset rolling force attenuation amount, and determining the current front tension of the stand based on the front tension setting value of the stand and a preset front tension attenuation amount. By means of the present invention, the technical problem of low production efficiency of the tandem cold rolling mill unit is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of cold rolling, and in particular relates to a production control method, device and equipment for a cold rolling unit. Background Art

[0002] In the process of strip steel production by the cold rolling mill, due to product demand, it is necessary to produce extreme wide strip steel that is close to the extreme capacity of the cold rolling mill. In the production process, after the transition from narrow strip steel production to extreme wide strip steel production, due to changes in production specifications and mismatched production conditions, the quality of the strip steel products produced may be low. In this case, it may be necessary to re-produce qualified products, thereby reducing the production efficiency of the cold rolling mill. In addition, it may also cause the cold rolling mill to be unable to work stably, prolonging the production time of this batch of strip steel, thereby reducing the production efficiency of the cold rolling mill. Due to inefficient production, enterprise costs increase and enterprise competitiveness decreases. Therefore, the low production efficiency of the cold rolling mill is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The embodiments of the present invention provide a production control method, device and equipment for a cold rolling mill, which solve the technical problem of low production efficiency of the cold rolling mill.

[0004] In a first aspect, an embodiment of the present invention provides a production control method for a cold rolling mill group, the cold rolling mill group includes a rolling mill, the rolling mill includes a plurality of frames, the method comprising: when the rolling mill rolls a first strip, obtaining a detection distance between a weld and an entrance of the rolling mill, the weld is located between the first strip and the second strip, the first strip enters the rolling mill later than the second strip, the width of the first strip is greater than the second strip, and the width of the first strip is 1750-1850 mm; if the detection distance is within a preset distance range, controlling the rolling mill to stop, and changing rolls for each of the plurality of frames to match the production conditions of the first strip; in response to a roll changing completion signal, controlling the rolling mill to start; when the rolling mill starts, for some of the plurality of frames, determining the current rolling force of the frame based on the first rolling force setting value of the frame and the preset rolling force attenuation amount, and determining the current front tension of the frame based on the front tension setting value of the frame and the preset front tension attenuation amount.

[0005] In combination with the first aspect of the present invention, in some embodiments, before controlling the rolling mill to stop, it also includes: based on the detection distance, reducing the rolling speed of the rolling mill, and increasing the working roll bending force and intermediate roll bending force of each of the multiple frames.

[0006] In connection with the first aspect of the present invention, in some embodiments, changing the rolls for each of the multiple stands includes: changing the rolls for each of the multiple stands in a roll changing sequence from both sides to the middle.

[0007] In connection with the first aspect of the present invention, in some embodiments, after changing the rolls for each of the multiple stands, it further includes: controlling the first strip to be in a straightened state, and controlling the rolling force of each of the multiple stands to a second rolling force set value, where the second rolling force set value is less than the first rolling force set value.

[0008] In connection with the first aspect of the present invention, in some embodiments, the cold tandem rolling mill further includes pickling equipment, the pickling equipment includes a first outlet loop and a second outlet loop, the production line distance of the second outlet loop from the rolling mill is less than that of the first outlet loop, and before changing the rolls for each of the multiple stands, the method further includes: when the rolling mill is stopped, obtaining the working parameters of the pickling equipment; adjusting the tensions of the first outlet loop and the second outlet loop based on the working parameters.

[0009] In connection with the first aspect of the present invention, in some embodiments, the working parameters include the detected loop amount of the second outlet loop, and adjusting the tensions of the first outlet loop and the second outlet loop based on the working parameters includes: if the detected loop amount is within a preset first loop amount range, determining the current tension of the first outlet loop based on the tension set value of the first outlet loop and a preset first tension attenuation amount, and determining the current tension of the second outlet loop based on the tension set value of the second outlet loop and a preset second tension attenuation amount; if the detected loop amount is within a preset second loop amount range, adjusting the tension of the second outlet loop to 0, where the upper limit value of the second loop amount range is less than the lower limit value of the first loop amount range.

[0010] In connection with the first aspect of the present invention, in some embodiments, before controlling the rolling mill to start up, the method further includes: controlling the emulsion circulating system of the rolling mill to flush the rolling mill and the first strip.

[0011] In connection with the first aspect of the present invention, in some embodiments, controlling the emulsion circulating system of the rolling mill to flush the rolling mill and the first strip includes: obtaining the flow set value of the emulsion circulating system; determining the current flow of the emulsion circulating system based on the flow set value and a preset flow increment to flush the rolling mill and the first strip.

[0012] In a second aspect, an embodiment of the present invention provides a production control device for a tandem cold rolling mill. The tandem cold rolling mill includes rolling mills, and each rolling mill includes a plurality of stands. The device includes: a distance acquisition unit configured to acquire a detected distance between a weld seam and an inlet of the rolling mill when the rolling mill rolls a first strip. The weld seam is located between the first strip and a second strip. The first strip enters the rolling mill later than the second strip, and the width of the first strip is greater than that of the second strip, and the width of the first strip is 1750 - 1850 mm; a roll changing unit configured to control the rolling mill to stop and change rolls for each of the plurality of stands if the detected distance is within a preset distance range to match the production conditions of the first strip; a starting unit configured to control the rolling mill to start up in response to a roll changing completion signal; and a stand control unit configured to, when the rolling mill starts up, for some of the plurality of stands, determine the current rolling force of the stand based on a first rolling force set value of the stand and a preset rolling force attenuation amount, and determine the current front tension of the stand based on a front tension set value of the stand and a preset front tension attenuation amount.

[0013] In a third aspect, an embodiment of the present invention provides an electronic device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the method described in any one of the first aspects is implemented.

[0014] One or more technical solutions provided by the embodiments of the present invention at least achieve the following technical effects or advantages:

[0015] In an embodiment of the present invention, when a first strip is rolled by a rolling mill, the detection distance between the weld seam and the rolling mill inlet is obtained. The weld seam is located between the first strip and the second strip. The first strip enters the rolling mill later than the second strip, and the width of the first strip is greater than that of the second strip. The width of the first strip is 1750 - 1850 mm. If the detection distance is within a preset distance range, the rolling mill is controlled to stop, and roll changing is performed for each of multiple stands to match the production conditions of the first strip. In response to the roll change completion signal, the rolling mill is controlled to start up. When the rolling mill starts up, for some of the multiple stands, the current rolling force of the stand is determined based on the first rolling force set value of the stand and the preset rolling force attenuation amount, and the current front tension of the stand is determined based on the front tension set value of the stand and the preset front tension attenuation amount. By performing roll changing for each of the multiple stands to match the production conditions of the first strip, the possibility of low quality of the produced strip product is reduced, and the possibility of re-producing qualified products is also reduced. When the rolling mill starts up, the rolling force and front tension of the stand are adjusted downward based on the first rolling force set value and the front tension set value, which avoids the strip breaking due to excessive rolling force and front tension, thereby ensuring the stable operation of the cold tandem rolling mill unit and shortening the production time of this batch of strips. Therefore, the production efficiency of the cold tandem rolling mill unit is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for description in the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a flowchart of the production control method for the cold tandem rolling mill unit in the embodiment of the present invention;

[0018] Figure 2 It is a functional module diagram of the production control device for the cold tandem rolling mill unit in the embodiment of the present invention;

[0019] Figure 3 It is a schematic structural diagram of the electronic device in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, rather than all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0021] In the present invention, descriptions such as "first" and "second" are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. Additionally, the technical solutions between various embodiments may be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] An embodiment of the present invention provides a production control method for a tandem cold rolling mill. The tandem cold rolling mill includes rolling mills, and the rolling mills include multiple stands. Refer to Figure 1 As shown, the method includes the following steps S101 to S104:

[0023] S101: When the rolling mill rolls the first strip, obtain the detection distance between the weld seam and the mill inlet. The weld seam is located between the first strip and the second strip. The first strip enters the rolling mill later than the second strip. The width of the first strip is greater than that of the second strip, and the width of the first strip is 1750 - 1850 mm.

[0024] It should be noted that the first strip is a strip with an extreme width specification, and its width is close to the extreme production capacity of the tandem cold rolling mill.

[0025] S102: If the detection distance is within a preset distance range, control the rolling mill to stop, and change the rolls for each of the multiple stands to match the production conditions of the first strip.

[0026] It should be noted that the preset distance range represents that the leading end of the first strip curls to the mandrel of the mill coiling position.

[0027] In some embodiments, before controlling the rolling mill to stop, it may further include: based on the detection distance, reducing the rolling speed of the rolling mill, and increasing the work roll bending force and intermediate roll bending force for each of the multiple stands.

[0028] In some embodiments, the multiple stands may include an S1 stand, an S2 stand, an S3 stand, an S4 stand, and an S5 stand, and the distances from the mill inlet in ascending order are: S1 stand, S2 stand, S3 stand, S4 stand, and S5 stand. For the following examples involving stands, reference can be made here.

[0029] In some embodiments, based on the detection distance, reducing the rolling speed of the rolling mill may be as follows: when the rolling mill rolls the second strip steel, set the rolling speed of the rolling mill to 140 - 200 M / Min. After the weld passes through the S4 stand, adjust the rolling speed to 100 - 120 M / Min. After the weld passes through the S5 stand, adjust the rolling speed to 60 M / Min.

[0030] It should be noted that increasing the work roll bending force and intermediate roll bending force of each stand in multiple stands may mean increasing by 5 - 10% based on the current actual value. Since the rolling force of the rolling mill increases after the rolling speed decreases, and at this time the strip steel is under unbalanced stress, it may cause double-sided waves in the strip steel shape. Therefore, increasing the work roll bending force and intermediate roll bending force can balance the stress of the strip steel, thereby avoiding double-sided waves in the strip steel shape, and also avoiding re-production due to low quality of the strip steel product. Therefore, the production efficiency of the cold tandem rolling mill is improved.

[0031] It should be noted that after controlling the rolling mill to stop, the rolling parameters of the rolling mill have been completely switched to the rolling parameters for producing the first strip steel. The rolling parameters for producing the first strip steel include the first rolling force setting value of the stand, the front tension setting value of the stand, and the rolling speed setting value, etc.

[0032] In some embodiments, in step S102, changing the rolls for each stand in multiple stands may include: changing the rolls for each stand in multiple stands in the roll changing order from both sides to the middle.

[0033] For example, the roll changing order may be: S5 stand - S1 stand - S4 stand - S2 stand - S3 stand. It should be noted that if the roll changing order is from side to side, it may cause displacement of the first strip steel, and then the deformation zone of the first strip steel undergoes secondary rolling, reducing the quality of the strip steel product. Therefore, following the roll changing order from both sides to the middle avoids displacement of the first strip steel, thereby improving the quality of the strip steel product.

[0034] It should be noted that before changing the rolls, adjust the strip steel clamping device of each stand to the clamping position to ensure that the position of the strip steel does not shift when the roll gap is opened for roll changing.

[0035] In some embodiments, after changing the rolls for each stand in multiple stands, it may further include: controlling the first strip steel to be in a straightened state, and controlling the rolling force of each stand in multiple stands to be the second rolling force setting value, where the second rolling force setting value is less than the first rolling force setting value.

[0036] Specifically, after the roll change operation is completed, adjust the roll gap position of each stand to 16 mm. First, adjust the rolling force of Stand S1 to 1.5 MN, which is the second rolling force set value. Subsequently, jog the mandrel at the coiling position to keep the strip in a straightened state inside the stand. Then, adjust the rolling forces of Stands S2 - S5 to 1.5 MN in sequence. Finally, establish the mill exit tension to the second-level set value. It should be noted that the second rolling force set value is a relatively small rolling force to avoid damage to the strip in a stationary state.

[0037] In some embodiments, the cold tandem rolling mill unit further includes pickling equipment. The pickling equipment includes a first exit loop and a second exit loop. The distance between the second exit loop and the production line of the rolling mill is less than that of the first exit loop. Before changing the rolls for each stand in multiple stands, the method may further include: when the rolling mill is stopped, obtaining the working parameters of the pickling equipment; and adjusting down the tensions of the first exit loop and the second exit loop based on the working parameters.

[0038] In some embodiments, the working parameters include the detected loop amount of the second exit loop. Adjusting down the tensions of the first exit loop and the second exit loop based on the working parameters may include: if the detected loop amount is within a preset first loop amount range, determining the current tension of the first exit loop based on the tension set value of the first exit loop and a preset first tension attenuation amount, and determining the current tension of the second exit loop based on the tension set value of the second exit loop and a preset second tension attenuation amount; if the detected loop amount is within a preset second loop amount range, adjusting down the tension of the second exit loop to 0, where the upper limit value of the second loop amount range is less than the lower limit value of the first loop amount range.

[0039] Specifically, determining the current tension of the first exit loop based on the tension set value of the first exit loop and a preset first tension attenuation amount may be: taking the difference between the tension set value of the first exit loop and the preset first tension attenuation amount as the current tension of the first exit loop. Determining the current tension of the second exit loop based on the tension set value of the second exit loop and a preset second tension attenuation amount may be: taking the difference between the tension set value of the second exit loop and the preset second tension attenuation amount as the current tension of the second exit loop.

[0040] It should be noted that after the roll stops, it is necessary to control the loop amounts of the first exit loop and the second exit loop to be no higher than 20%. The rolling force of each stand is switched from the actual rolling force to the minimum rolling force of 1.5 MN. Then, the speeds of the pickling process section and the exit section are reduced to 15 m / min. The set value of the tension of the first exit loop can be the secondary set tension, and the first tension attenuation amount can be 50% of the set value of the tension of the first exit loop. The set value of the tension of the second exit loop can be the secondary set tension, and the second tension attenuation amount can be 50% of the set value of the tension of the second exit loop. The second loop amount range can be 30% - 35%, and the first loop amount range can be 35% - 100%. First, reduce the tension of the second exit loop by 50% from the secondary set tension, and then reduce the set tension of the first exit loop by 50% from the secondary set tension. When the loop amount of the second exit loop is 30% - 35%, stop the pickling exit section and relieve the tension of the strip in the second exit loop.

[0041] It should be noted that after the rolling mill stops, control the rolling force of stands S1 - S5 to be 1.5 MN. The strip in each stand is in a tension-free state. The strip in the rolling mill is affected by the tension of the strip in the exit loop, and the deformation zone of the strip in each stand will slowly shift towards the entrance of the rolling mill. After changing the roll and starting up, the position of the strip deformation zone shifts, that is, the pressing position between the roll and the strip displaces. During the starting process, the position of the deformation zone undergoes secondary rolling, which may cause large fluctuations in the rolling effect of the strip and may reduce the quality of the strip product. Therefore, pre-adjusting the tensions of the first exit loop and the second exit loop can reduce the effect of the tension of the strip in the exit loop on the strip in the rolling mill, avoid the shift of the position of the strip deformation zone, and also avoid the secondary rolling of the deformation zone position. Therefore, the quality of the strip product is improved.

[0042] S103: In response to the roll change completion signal, control the rolling mill to start up.

[0043] In some embodiments, before controlling the rolling mill to start up, the method may further include: controlling the emulsion circulation system of the rolling mill to flush the rolling mill and the first strip.

[0044] In some embodiments, controlling the emulsion circulation system of the rolling mill to flush the rolling mill and the first strip may include: obtaining the flow set value of the emulsion circulation system; determining the current flow of the emulsion circulation system based on the flow set value and a preset flow increment to flush the rolling mill and the first strip.

[0045] Specifically, determining the current flow of the emulsion circulation system based on the flow set value and a preset flow increment may be: taking the sum of the flow set value and the preset flow increment as the current flow of the emulsion circulation system.

[0046] Among them, the current flow rate of the S1-S4 stands can be adjusted to 6,500-7,500 L / min, and the current flow rate of the S5 stand can be adjusted to 2,500-3,500 L / min to flush the rolls and the strip surface, improve the cleanliness of the rolls and the strip surface, and thus improve the quality of the strip product. In addition, in the early stage of flushing, the flow rate of the emulsion circulation system is increased, and the rolls and the strip are preheated to a certain extent by the heat of the emulsion, which can improve the rolling effect and thus improve the quality of the strip product. In the later stage of flushing, after the emulsion circulation system flushes for 3-5 minutes, the flow rate of the emulsion circulation system is then reduced to the set flow rate value and restored to the normal starting rolling state.

[0047] S104: When the rolling mill starts up, for some stands among multiple stands, determine the current rolling force of the stand based on the first rolling force set value of the stand and the preset rolling force attenuation amount, and determine the current front tension of the stand based on the front tension set value of the stand and the preset front tension attenuation amount.

[0048] Specifically, determining the current rolling force of the stand based on the first rolling force set value of the stand and the preset rolling force attenuation amount can be: taking the difference between the first rolling force set value of the stand and the preset rolling force attenuation amount as the current rolling force of the stand. Determining the current front tension of the stand based on the front tension set value of the stand and the preset front tension attenuation amount can be: taking the difference between the front tension set value of the stand and the preset front tension attenuation amount as the current front tension of the stand.

[0049] It should be noted that when the rolling mill starts up, since the rolling speed is slow, the rolling force and the front tension of the stand act on the same part of the strip for a long time. If the rolling force and the front tension are too large, it may cause the strip to break. Therefore, by reducing the rolling force and the front tension of the stand on the basis of the first rolling force set value and the front tension set value, it is possible to avoid the strip breaking due to excessive rolling force and front tension, thereby ensuring the stable operation of the cold tandem mill and shortening the production time of this batch of strip. Therefore, the production efficiency of the cold tandem mill is improved.

[0050] It should be noted that the first rolling force setting value refers to the rolling force of the frame after the start-up is completed, and the front tension setting value refers to the front tension of the frame after the start-up is completed, which needs to be determined according to the specifications of the first strip. When the rolling mill is starting up, turn off the hydraulic automatic thickness control system of the S1~S5 frames, and increase the tension of the second exit looper to 50% of the tension setting value of the second exit looper. The rolling force attenuation can be 2~3MN, and some frames can refer to S1~S4 frames. After starting up, check the tension deviation of each frame and control it within 15KN. Check the actual plate shape of the strip between the frames through the monitors of each frame, adjust the bending roll force according to the actual plate shape, and ensure the straightness of the strip shape between the frames. After the vehicle starts to travel 10 to 20 meters, the front tension of the S1 to S4 frames is gradually restored to the secondary setting value, and the hydraulic automatic thickness control system of the S1 to S3 frames is turned on. At this time, the S1 to S3 frames automatically adjust the thickness according to the feedback of the thickness gauge, and the operator adjusts the bending roll force and the inclination value according to the actual plate shape of the strip in the frame. After the tension, thickness and plate shape between the frames are stable, the rolling speed is increased to 100-120m / min, and the hydraulic automatic thickness control system of the S4 and S5 frames is turned on. At this time, the hydraulic automatic thickness control system of the S1-S5 frames is all put into normal use, and each frame automatically adjusts the thickness according to the thickness closed-loop feedback system. When the outlet thickness fluctuates within 3%, the coiling operation is performed. After coiling, the tension of the first outlet looper and the second outlet looper is restored to the secondary setting value, and the vehicle starts normally. After the adjustment of this operation method is completed, the rolling mill resumes normal rolling.

[0051] It should be noted that in the production process of the cold rolling mill, due to product demand, it is necessary to produce products close to the limit capacity of the equipment. In the production process, since the limit specification is at the upper limit of the width, in order to meet the quality requirements, after the transition from the narrow specification to the limit width specification, the rolling mill needs to be stopped to replace the rolls. In the process of starting after the roll change, the state of the rolls, the state of the strip in the frame, and the rolling parameters change, which increases the instability factors in the process of starting, resulting in problems such as loss of tension and breaking of the strip between the frames, deviation, and equipment damage during the process of starting. It also causes the product quality to fail to meet the quality requirements, and the rolling mill is forced to stop to handle the fault. The width of the limit specification strip is 1750mm-1850mm, the reduction rate is 75-85%, and the export thickness is 0.6mm-1.0mm.

[0052] In order to enhance the understanding of the embodiments of the present invention, the following examples are given:

[0053] Embodiment 1:

[0054] The variety of the first strip steel is M3A33, and the specifications are 3.5mm * 1802mm to 0.665mm * 1802mm. First step, before changing the rolls and stopping the machine for producing strip steel of the limit specifications, set the dynamic variable specification speed to 180M / Min. After the weld passes through the S4 stand, adjust the mill speed to 115M / Min. After the weld passes through the S5 stand, adjust the rolling speed to 60M / Min. At this time, increase the bending roll forces of the working rolls and intermediate rolls of the S1 - S5 stands by 5 - 10% based on the actual values. The adjusted values are shown in Table 1. Roll for 12 meters at this speed state, curl the leading end of the limit width to the mandrel of the mill coiling position, and stop the mill. At this time, the strip steel of the limit specifications has been coiled to the mandrel of the coiling position, and the rolling parameters have been completely switched to the rolling parameters for producing strip steel of the limit width specifications. After changing the rolls and starting the machine, the parameters of each stand will not change due to the specification change, which can reduce the secondary adjustment operation after starting the machine. Second step, after the mill changes the rolls and stops, switch the rolling forces of the S1 - S5 stands to the minimum rolling force of 1.5MN. The strip steel in each stand is in a tension-free state after stopping. Control the loop amounts of the first exit loop and the second exit loop to be 5% and 20% respectively. After the rolling forces of each stand are switched from the actual rolling forces to the minimum rolling force state of 1.5MN, reduce the speeds of the pickling process section and the exit section to 15M / Min. First, reduce the tension of the second exit loop by 50% from the secondary set tension, adjust it from 110KN to 55KN, and then reduce the set tension of the first exit loop by 50% from the secondary set tension, adjust it from 120KN to 60KN. When the loop amount of the second exit loop reaches 33%, stop the pickling exit section and relieve the tension of the strip steel in the second exit loop. Third step, before changing the rolls, adjust the strip steel clamping devices of each stand to the clamping position to ensure that the position of the strip steel does not shift after the roll gap is opened. The order of opening the roll gap is S5 - S1 - S4 - S2 - S3. After the roll gap is opened, perform the automatic roll change operation. After the roll change operation is completed, adjust the roll gap positions of each stand to 16mm. First, adjust the roll gap of the S1 stand to the minimum rolling force of 1.5MN, and then jog the mandrel of the coiling position to make the strip steel in the stand in a straightened state. Adjust the roll gaps of the S2 - S5 stands to the minimum rolling force state of 1.5MN in sequence, and finally establish the mill exit tension to the secondary set value of 54KN. Fourth step, adjust the emulsion flow rate of the S1 - S4 stands to 7000L / Min, and adjust the emulsion flow rate of the S5 stand to 3200L / Min to flush the rolls and the surface of the strip steel, improve the cleanliness of the rolls and the surface of the strip steel, and preheat the rolls and the strip steel to a certain extent using the heat of the emulsion. After the emulsion circulation system sprays for 5 minutes, restore the emulsion system to the normal start-up state.Step 5: Turn off the hydraulic automatic gauge control system of stands S1 - S5, and restore the tension of the second exit loop. Adjust the tension value set at the second level from 110 KN to 55 KN. Operate the mill to start up, adjust the rolling force of stand S1 from 20.7 MN to 18.5 MN, the rolling force of stand S2 from 19.6 MN to 17 MN, the rolling force of stand S3 from 19.3 MN to 17 MN, and the rolling force of stand S4 from 16.38 MN to 14 MN, so as to reduce the possibility of strip thinning caused by excessive rolling force during startup and avoid strip breakage. Keep the set rolling force of stand S5 unchanged. Step 6: Adjust the front tension of stand S1 from 454 KN to 405 KN, the front tension of stand S2 from 348 KN to 310 KN, the front tension of stand S3 from 245 KN to 210 KN, and the front tension of stand S4 from 202 KN to 170 KN, to reduce the phenomenon of strip breakage during the process of establishing tension when the mill starts up statically. Adjust the tension deviation of each stand within 15 KN. After the mill has traveled 15 meters during startup, gradually restore the front tension of stands S1 - S4 to the set value at the second level, and turn on the hydraulic automatic gauge control system of stands S1 - S3. At this time, stands S1 - S3 perform automatic thickness adjustment according to the feedback from the thickness gauge, and the operator adjusts the bending roll force and tilt value according to the actual strip shape inside the stand. After the tension, thickness, and strip shape between stands are stable, increase the rolling speed to 105 m / min, and turn on the thickness control system of stands S4 and S5. At this time, the thickness control systems of stands S1 - S5 are all put into normal use, and each stand performs automatic thickness adjustment according to the thickness closed-loop feedback system. When the thickness fluctuation at the exit is within 3%, perform the coiling operation. After coiling, restore the tension of the first exit loop and the second exit loop to the set value at the second level, and start up normally.

[0055] Table 1:

[0056]

[0057] Example 2:

[0058] The variety of the first strip steel is M3A36, and the specifications are: 4.0mm * 1845mm - 0.71mm * 1845mm. First step, before changing rolls and stopping the machine when producing the limit specifications, set the dynamic variable specification speed to 160 M / min. After the weld passes through the S4 stand, adjust the mill speed to 120 M / min. After the weld passes through the S5 stand, adjust the rolling speed to 60 M / min. At this time, increase the bending force of the work rolls and intermediate rolls of the S1 - S5 stands by 5 - 10% based on the actual value to avoid double-sided waves in the strip shape caused by the increase in rolling force after the mill speed decreases. The adjusted values are shown in Table 2. Roll 10 meters at this speed state, curl the leading end of the limit width to the mandrel of the mill coiler, and stop the mill. At this time, the limit specifications have been coiled to the mandrel of the coiler, and the rolling parameters have been completely switched to the rolling parameters for producing the limit width specifications. After changing rolls and starting the machine, the parameters of each stand will not change due to specification changes, which can reduce the secondary adjustment operation after starting the machine. Second step, after the mill changes rolls and stops, switch the rolling force of the S1 - S5 stands to the minimum rolling force of 1.5 MN. The strip steel in each stand is in a tension-free state after stopping. Control the loop amounts of the first exit loop and the second exit loop to be 10% and 15% respectively. After the rolling force of each stand is switched from the actual rolling force to the minimum rolling force of 1.5 MN state, reduce the speed of the pickling process section and the exit section to 15 M / min. First, reduce the tension of the second exit loop by 50% from the secondary set tension, from 120 KN to 60 KN. Then, reduce the set tension of the first exit loop by 50% from the secondary set tension, from 120 KN to 60 KN. When the loop amount of the second exit loop reaches 30%, stop the pickling exit section and relieve the tension of the strip steel in the second exit loop. Third step, before changing rolls, adjust the strip steel clamping devices of each stand to the clamping position to ensure that the position of the strip steel does not shift after the roll gap is opened. The order of opening the roll gap is S5 - S1 - S4 - S2 - S3. After the roll gap is opened, perform the automatic roll change operation. After the roll change operation is completed, adjust the roll gap position of each stand to 16 mm. First, adjust the roll gap of the S1 stand to the minimum rolling force of 1.5 MN, and then jog the mandrel of the coiler to make the strip steel in the stand in a straightened state. Adjust the roll gaps of the S2 - S5 stands to the minimum rolling force of 1.5 MN state in sequence. Finally, establish the mill exit tension to the secondary set value of 65 KN. Fourth step, adjust the emulsion flow rate of the S1 - S4 stands to 7200 L / min, and adjust the emulsion flow rate of the S5 stand to 3500 L / min to flush the rolls and the surface of the strip steel, improve the cleanliness of the rolls and the surface of the strip steel, and preheat the rolls and the strip steel to a certain extent using the heat of the emulsion. After the emulsion large circulation system sprays for 5 minutes, restore the emulsion system to the normal start-up state. Fifth step, turn off the hydraulic automatic gauge control system of the S1 - S5 stands, and restore the tension of the second exit loop, which is adjusted from the secondary set tension value of 120 KN to 60 KN.Start up the rolling mill, adjust the rolling force of S1 stand from 19.85 MN to 17.5 MN, the rolling force of S2 stand from 18.67 MN to 16.5 MN, the rolling force of S3 stand from 18.05 MN to 16 MN, and the rolling force of S4 stand from 16.87 MN to 15.5 MN, so as to reduce the possibility of strip thinning caused by excessive rolling force during start-up and avoid strip breakage. Keep the set rolling force of S5 stand unchanged. In the sixth step, adjust the front tension of S1 stand from 502 KN to 450 KN, the front tension of S2 stand from 415 KN to 350 KN, the front tension of S3 stand from 296 KN to 255 KN, and the front tension of S4 stand from 235 KN to 195 KN, to reduce the phenomenon of strip breakage during the process of establishing tension during the static start-up of the rolling mill, and adjust the tension deviation of each stand within 15 KN. After walking 15 m during start-up, gradually restore the front tension of S1 - S4 stands to the second-level set value, and turn on the hydraulic automatic gauge control system of S1 - S3 stands. At this time, S1 - S3 stands perform automatic thickness adjustment according to the feedback of the thickness gauge, and the operator adjusts the bending roll force and tilt value according to the actual strip shape inside the stand. After the tension, thickness, and shape between the stands are stable, increase the rolling speed to 110 m / min, and turn on the thickness control system of S4 and S5 stands. At this time, the thickness control systems of S1 - S5 stands are all put into normal use, and each stand performs automatic thickness adjustment according to the thickness closed-loop feedback system. When the outlet thickness fluctuation is within 3%, perform the coiling operation. After coiling, restore the tension of the first outlet loop and the second outlet loop to the second-level set value, and start up normally.

[0059] Table 2:

[0060]

[0061] In an embodiment of the present invention, when the rolling mill rolls the first strip, the detection distance between the weld seam and the mill inlet is obtained. The weld seam is located between the first strip and the second strip. The first strip enters the rolling mill later than the second strip, and the width of the first strip is greater than that of the second strip. The width of the first strip is 1750 - 1850 mm. If the detection distance is within the preset distance range, the rolling mill is controlled to stop, and roll changing is performed on each of the multiple stands to match the production conditions of the first strip. In response to the roll change completion signal, the rolling mill is controlled to start up. When the rolling mill starts up, for some of the multiple stands, the current rolling force of the stand is determined based on the first rolling force setting value of the stand and the preset rolling force attenuation amount, and the current front tension of the stand is determined based on the front tension setting value of the stand and the preset front tension attenuation amount. By performing roll changing on each of the multiple stands to match the production conditions of the first strip, the possibility of producing strip products with low quality is reduced, and the possibility of re-producing qualified products is also reduced. When the rolling mill starts up, the rolling force and front tension of the stand are reduced on the basis of the first rolling force setting value and the front tension setting value, thus avoiding strip breakage due to excessive rolling force and front tension, ensuring the stable operation of the cold tandem rolling mill unit, and shortening the production time of this batch of strips. Therefore, the production efficiency of the cold tandem rolling mill unit is improved.

[0062] Based on the same inventive concept, referring to Figure 2 As shown, an embodiment of the present invention provides a production control device 10 for a cold tandem rolling mill unit. The cold tandem rolling mill unit includes a rolling mill, and the rolling mill includes multiple stands. The device includes: a distance acquisition unit 110, configured to obtain the detection distance between the weld seam and the mill inlet when the rolling mill rolls the first strip. The weld seam is located between the first strip and the second strip. The first strip enters the rolling mill later than the second strip, and the width of the first strip is greater than that of the second strip. The width of the first strip is 1750 - 1850 mm; a roll changing unit 120, configured to control the rolling mill to stop and perform roll changing on each of the multiple stands to match the production conditions of the first strip if the detection distance is within the preset distance range; a starting unit 130, configured to control the rolling mill to start up in response to the roll change completion signal; and a stand control unit 140, configured to, when the rolling mill starts up, for some of the multiple stands, determine the current rolling force of the stand based on the first rolling force setting value of the stand and the preset rolling force attenuation amount, and determine the current front tension of the stand based on the front tension setting value of the stand and the preset front tension attenuation amount.

[0063] It can be understood that the production control device 10 of the cold tandem rolling mill unit further includes: a speed adjustment unit, configured to, before controlling the rolling mill to stop, reduce the rolling speed of the rolling mill based on the detection distance, and increase the work roll bending force and intermediate roll bending force of each of the multiple stands.

[0064] It can be understood that the roll changing unit 120 is specifically used for: changing the rolls of each of the multiple stands in the roll changing order from both sides to the middle.

[0065] It can be understood that the production control device 10 of the tandem cold rolling mill further includes: a state control unit for controlling the first strip in a straightened state and controlling the rolling force of each of the multiple stands to a second rolling force setting value after changing the rolls of each of the multiple stands, and the second rolling force setting value is less than the first rolling force setting value.

[0066] It can be understood that the tandem cold rolling mill further includes pickling equipment, the pickling equipment includes a first outlet loop and a second outlet loop, the production line distance between the second outlet loop and the rolling mill is less than that of the first outlet loop, and the production control device 10 of the tandem cold rolling mill further includes: a parameter acquisition unit for acquiring the working parameters of the pickling equipment when the rolling mill is stopped before changing the rolls of each of the multiple stands; a tension reduction unit for reducing the tensions of the first outlet loop and the second outlet loop based on the working parameters.

[0067] It can be understood that the working parameters include the detected loop amount of the second outlet loop, and the tension reduction unit is specifically used for: if the detected loop amount is within a preset first loop amount range, determining the current tension of the first outlet loop based on the tension setting value of the first outlet loop and a preset first tension attenuation amount, and determining the current tension of the second outlet loop based on the tension setting value of the second outlet loop and a preset second tension attenuation amount; if the detected loop amount is within a preset second loop amount range, reducing the tension of the second outlet loop to 0, where the upper limit value of the second loop amount range is less than the lower limit value of the first loop amount range.

[0068] It can be understood that the production control device 10 of the tandem cold rolling mill further includes: a flushing unit for controlling the emulsion circulation system of the rolling mill to flush the rolling mill and the first strip before controlling the rolling mill to start up.

[0069] It can be understood that the flushing unit is specifically used for: acquiring the flow setting value of the emulsion circulation system; determining the current flow of the emulsion circulation system based on the flow setting value and a preset flow increment to flush the rolling mill and the first strip.

[0070] It should be understood that more implementation details of the production control device 10 of the tandem cold rolling mill in the embodiments of the present invention are referred to in the aforementioned production control method of the tandem cold rolling mill. For the sake of brevity of the specification, they will not be elaborated here.

[0071] Based on the same inventive concept, the embodiments of the present invention further provide an electronic device, such as Figure 3As shown, it includes a memory 304, a processor 302, and a computer program stored on the memory 304 and executable on the processor 302. The processor 302 executes the program to implement the steps described in any implementation manner of the production control method of the cold tandem rolling mill unit.

[0072] Among them, in Figure 3 it, the bus architecture (represented by bus 300), the bus 300 can include any number of interconnected buses and bridges. The bus 300 links various circuits including one or more processors represented by the processor 302 and the memory represented by the memory 304 together. The bus 300 can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, etc., which are well known in the art, so they will not be further described herein. The bus interface 305 provides an interface between the bus 300 and the receiver 301 and the transmitter 303. The receiver 301 and the transmitter 303 can be the same element, that is, a transceiver, providing a unit for communicating with various other devices on the transmission medium. The processor 302 is responsible for managing the bus 300 and general processing, while the memory 304 can be used to store data used by the processor 302 when performing operations.

[0073] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, then the functions can be stored as one or more instructions or codes on a computer-readable medium or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present invention and the appended claims. For example, due to the nature of software, the functions described above can be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination of these. In addition, each functional unit can be integrated in one processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0074] In several embodiments provided in the present application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only illustrative. For example, the division of the units can be a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of units or modules can be in an electrical or other form.

[0075] The unit described as a separating component may or may not be physically separated. The component as a control device may or may not be a physical unit, that is, it may be located in one place or may be distributed to multiple units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0076] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, read-only memories (ROMs), random access memories (RAMs), mobile hard disks, magnetic disks, or optical discs that can store program codes.

[0077] The above are only the embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A production control method for a cold rolling mill, characterized in that: The cold rolling mill group includes a rolling mill, the rolling mill includes a plurality of stands, and the method includes: When the rolling mill rolls the first steel strip, a detection distance between the weld and the rolling mill entrance is obtained, the weld is located between the first steel strip and the second steel strip, the first steel strip enters the rolling mill later than the second steel strip, the first steel strip is wider than the second steel strip, and the width of the first steel strip is 1750-1850 mm; If the detection distance is within a preset distance range, the rolling mill is controlled to stop, and rolls are changed for each of the multiple stands to match the production conditions of the first steel strip; the preset distance range represents the curling of the strip head of the first steel strip to the curling position mandrel of the rolling mill; In response to a roll change completion signal, controlling the rolling mill to start; When the rolling mill is starting, for some of the multiple frames, the current rolling force of the frame is determined based on the first rolling force setting value of the frame and the preset rolling force attenuation amount, and the current front tension of the frame is determined based on the front tension setting value of the frame and the preset front tension attenuation amount; the first rolling force setting value refers to the rolling force of the frame after the starting is completed, and the front tension setting value refers to the front tension of the frame after the starting is completed.

2. The production control method of the cold rolling mill according to claim 1, characterized in that: Before controlling the rolling mill to stop, the method further includes: Based on the detection distance, the rolling speed of the rolling mill is reduced, and the working roll bending force and the intermediate roll bending force of each of the multiple stands are increased.

3. The production control method of the cold rolling mill according to claim 1, characterized in that: The step of changing the rollers of each of the plurality of racks comprises: The rolls of each of the plurality of frames are changed in a roll changing sequence from both sides to the middle.

4. The production control method of the cold rolling mill according to claim 1, characterized in that: After changing the rollers of each of the plurality of racks, the method further comprises: The first steel strip is controlled to be in a straightened state, and the rolling force of each of the multiple stands is controlled to be a second rolling force setting value, wherein the second rolling force setting value is smaller than the first rolling force setting value.

5. The production control method of the cold rolling mill according to claim 1, characterized in that: The cold rolling mill group further includes a pickling device, the pickling device includes a first outlet looper and a second outlet looper, the second outlet looper is less distant from a production line of the rolling mill than the first outlet looper, and before changing the rolls of each of the plurality of stands, the method further includes: When the rolling mill is stopped, obtaining the working parameters of the pickling equipment; The tension of the first outlet looper and the second outlet looper is reduced based on the working parameters.

6. The production control method of the cold rolling mill according to claim 5, characterized in that: The working parameter includes a detection amount of the second outlet looper, and reducing the tension of the first outlet looper and the second outlet looper based on the working parameter includes: If the detection set amount is within a preset first set amount range, the current tension of the first outlet looper is determined based on the tension setting value of the first outlet looper and the preset first tension attenuation, and the current tension of the second outlet looper is determined based on the tension setting value of the second outlet looper and the preset second tension attenuation; If the detection set amount is within a preset second set amount range, the tension of the second outlet loop is reduced to 0, wherein the upper limit value of the second set amount range is less than the lower limit value of the first set amount range.

7. The production control method of the cold rolling mill according to claim 1, characterized in that: Before controlling the rolling mill to start, the method further includes: The emulsion circulation system of the rolling mill is controlled to flush the rolling mill and the first steel strip.

8. The production control method of the cold rolling mill according to claim 7, characterized in that: The emulsion circulation system controlling the rolling mill to flush the rolling mill and the first steel strip comprises: Obtaining a flow setting value of the emulsion circulation system; The current flow of the emulsion circulation system is determined based on the flow setting value and a preset flow increment to flush the rolling mill and the first steel strip.

9. A production control device for a cold rolling mill, characterized in that: The cold rolling mill group includes a rolling mill, the rolling mill includes a plurality of stands, and the device includes: a distance acquisition unit, configured to acquire a detection distance between a weld and an entrance of the rolling mill when the rolling mill rolls a first steel strip, the weld being located between the first steel strip and a second steel strip, the first steel strip entering the rolling mill later than the second steel strip, the first steel strip being wider than the second steel strip, and the width of the first steel strip being 1750-1850 mm; a roll changing unit, configured to control the rolling mill to stop if the detection distance is within a preset distance range, and to change rolls for each of the plurality of stands to match the production conditions of the first steel strip; the preset distance range represents the curling of the strip head of the first steel strip to the curling position mandrel of the rolling mill; A starting unit, used for controlling the rolling mill to start in response to a roll change completion signal; A frame control unit is used to determine, for some of the multiple frames, the current rolling force of the frame based on the first rolling force setting value of the frame and the preset rolling force attenuation amount, and to determine the current front tension of the frame based on the front tension setting value of the frame and the preset front tension attenuation amount when the rolling mill is starting; the first rolling force setting value refers to the rolling force of the frame after the start-up is completed, and the front tension setting value refers to the front tension of the frame after the start-up is completed.

10. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1 to 8 when executing the computer program.

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