CN110064666B - Strip steel head and tail shearing control method - Google Patents
Strip steel head and tail shearing control method Download PDFInfo
- Publication number
- CN110064666B CN110064666B CN201910221612.6A CN201910221612A CN110064666B CN 110064666 B CN110064666 B CN 110064666B CN 201910221612 A CN201910221612 A CN 201910221612A CN 110064666 B CN110064666 B CN 110064666B
- Authority
- CN
- China
- Prior art keywords
- strip steel
- speed
- tail
- shearing
- pinch roll
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000010008 shearing Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 64
- 241000277275 Oncorhynchus mykiss Species 0.000 title claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 147
- 239000010959 steel Substances 0.000 claims abstract description 147
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 239000013589 supplement Substances 0.000 claims abstract description 4
- 230000001133 acceleration Effects 0.000 claims description 28
- 239000002184 metal Substances 0.000 claims description 28
- 229910052751 metal Inorganic materials 0.000 claims description 28
- 238000001514 detection method Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 239000011574 phosphorus Substances 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 description 41
- 238000005096 rolling process Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/70—Length control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/72—Rear end control; Front end control
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The invention relates to the field of hot-rolled strip steel, in particular to a shearing control method for the head and the tail of strip steel, which comprises the following steps: acquiring the pre-shearing length of the head or the tail of the strip steel to be sheared by the flying shear 1; acquiring a preset length compensation condition and determining a compensation value; obtaining the actual shearing length according to the compensation value determined by the preset length supplement condition and the pre-shearing length; judging whether the actual shearing length is within the threshold range of the set process of the head or the tail of the strip steel to be sheared, and meeting the requirements of the production process; if yes, finishing shearing; compared with the prior art, the method has the advantages that the pre-shearing length of the strip steel is compensated, and the head and tail lengths of the sheared strip steel are controlled, so that the length of the sheared strip steel is within the range of process requirements, the production requirement is met, the yield is improved, and the follow-up procedures are facilitated.
Description
Technical Field
The application relates to the field of hot-rolled strip steel, in particular to a shearing control method for the head and the tail of strip steel.
Background
Strip steel is a steel sheet used for manufacturing welded pipes, clips, saw blades or blades, etc. The method is divided into hot rolling and cold rolling according to the rolling method. The production process of the hot rolled strip steel comprises the following steps: controlling the processes of blank preparation, heating, dephosphorization, rough rolling, end cutting, finish rolling, cooling, coiling, finishing and the like.
In the metallurgical industry, the hot rolled strip steel needs to be subjected to head and tail cutting by flying shears 1 after being subjected to rough rolling, and then is rolled into a product by a finishing mill, wherein the width of the produced hot rolled strip steel is generally 600-2000 mm. At present, the control precision of the head and the tail of hot rolled strip steel is poor, the tail cutting of the strip steel is taken as an example for illustration, the tail cutting in the process of producing the strip steel in the prior art is large and small, and the deviation of the tail cutting length can reach more than 150mm when different steel types are rolled.
If the tail cutting is too small, the fish tail is often caused, and meanwhile, the tail which cannot be cut off is brought into a rolling mill due to the fact that the tail cannot be cut off, so that the subsequent process is influenced. If the cut end is too large, the yield will be affected and waste will be caused.
Content of application
The embodiment of the application provides a shearing control method for the head and the tail of strip steel, and aims to solve the technical problems that in the prior art, the control precision of the head and the tail of the strip steel is poor, and the length deviation of the head and the tail of the strip steel is overlarge.
In order to solve the above problem, an embodiment of the present application provides a method for controlling shearing of a strip steel head and a strip steel tail, where the method includes: acquiring the pre-shearing length of the head or the tail of the strip steel to be sheared by the flying shear 1; acquiring preset length compensation conditions to determine a compensation value; obtaining the actual shearing length according to the compensation value determined by the preset length supplement condition and the pre-shearing length; judging whether the actual shearing length is within the threshold range of the set process of the head or the tail of the strip steel to be sheared and meets the requirements of the production process; if yes, finishing shearing.
Preferably, the method further comprises: if not, adjusting the preset length compensation condition, and repeating the step of obtaining the actual shearing length until the actual shearing length meets the threshold range of the set process and meets the requirements of the production process.
Preferably, before the step of obtaining the pre-shearing length of the head or the tail of the strip steel to be sheared by the flying shear 1, the method further comprises: the strip steel to be sheared is pretreated in the previous process procedure adjacent to shearing so as to reduce the floating iron oxide scale on the surface of the strip steel; wherein the pre-processing comprises: the iron scale on the surface of the strip steel is reduced by increasing air blowing, or the water vapor on the surface of the strip steel is reduced by increasing a fan, or the step of removing phosphorus on the surface of the strip steel is omitted.
Preferably, the method further comprises: taking cooling measures for the hot metal detector, comprising: wrapping with heat-insulating cotton and adding water cooling; the measure for cooling the detection point of the hot metal detector 3 comprises the step of arranging a pore channel at the plate channel of the detection point of the metal detector to increase air cooling.
Preferably, the preset length compensation condition determination compensation value is obtained by: according to the change value of the speed of the pinch roll 2 influencing the advancing speed of the strip steel, obtaining a speed compensation value A1 based on the change value of the speed of the pinch roll 2; acquiring an acceleration compensation value A2 based on the acceleration of the pinch roll 2 according to the acceleration of the pinch roll 2 influencing the advancing acceleration of the strip steel; the preset length compensation condition determines a compensation value which is the sum of the speed compensation value A1 and the acceleration compensation value A2.
Preferably, the step of obtaining the speed compensation value a1 based on the speed variation value of the pinch roll 2 according to the speed variation value of the pinch roll 2 influencing the traveling speed of the strip steel comprises the following steps: acquiring a functional relation between the speed of the pinch roll 2 influencing the advancing speed of the strip steel and the actual shearing length; and acquiring a speed compensation value A1 according to the change value of the speed of the pinch roll 2 and the functional relation.
Preferably, the change value of the speed of the pinch roll 2 is specifically: and the difference value between the speed of the current strip steel pinch roll 2 and a fixed value and the difference value between the speed of the previous strip steel pinch roll 2 and the fixed value.
Preferably, before the functional relationship between the speed of the pinch roll 2 influencing the traveling speed of the strip steel and the actual shearing length is obtained, the following steps are executed: the roll feeding pressure of the pinch roll 2 is increased, wherein the roll feeding pressure ranges from 20KN to 50 KN.
Preferably, the step of obtaining an acceleration compensation value a2 based on the acceleration of the pinch roll 2 according to the acceleration of the pinch roll 2 affecting the traveling acceleration of the strip steel includes the following steps:
A2＝1/2*at2＝10*(L/V)2。
preferably, the threshold range of the set process is-250 mm.
One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:
the embodiment of the application provides a method for controlling the shearing of the head and the tail of a strip steel, which comprises the following steps: acquiring the pre-shearing length of the head or the tail of the strip steel to be sheared by the flying shear 1; acquiring preset length compensation conditions to determine a compensation value; obtaining the actual shearing length according to the compensation value determined by the preset length supplement condition and the pre-shearing length; judging whether the actual shearing length is within the threshold range of the set process of the head or the tail of the strip steel to be sheared and meets the requirements of the production process; if yes, finishing shearing. The method is used for solving the technical problems that the control precision of the head and the tail of the strip steel is poor and the length deviation of the head and the tail of the strip steel is overlarge in the prior art. The pre-shearing length of the strip steel is compensated, and the head and tail lengths of the sheared strip steel are controlled, so that the length of the sheared strip steel is within the range of the process requirement, the yield is improved, and the follow-up procedures are facilitated.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
FIG. 1 is a schematic flow chart of a method for controlling the shearing of the head and the tail of a strip steel in the embodiment of the invention;
FIG. 2 is a schematic flow chart illustrating obtaining a length compensation condition according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating the process of obtaining the speed compensation value A1 according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of the principle of strip steel tailing in the embodiment of the invention;
fig. 5 is a schematic diagram of the speed and the crop values of the pinch roll 2 modeled in the embodiment of the invention.
Detailed Description
The embodiment of the application provides a shearing control method for the head and the tail of strip steel, which is used for solving the technical problems that the control precision of the head and the tail of the strip steel is poor and the length deviation of the head and the tail of the strip steel is overlarge in the prior art.
The inventor of the present application has found through research that in the process of end-to-end cutting of hot-rolled strip steel, taking end-to-end cutting as an example, the setting of the end-to-end cutting value needs to be adjusted frequently, and if a fixed value is taken as the end-to-end cutting value, strip steel with different lengths can be obtained, which is difficult to meet the requirement of subsequent processing.
The adjustment of the tail-cutting value is not random, but is related to the running speed of the strip steel (the actual speed of the strip steel can also be related to the running speed of the strip steel), and after the strip steel reaches the position of the flying shears 1 for cutting the head and the tail, if the speed of the strip steel changes, the distance that the strip steel stretches into the flying shears 1 is affected, so that the length of the strip steel cut by the flying shears 1 is changed. In the production process, the pinch roll 2 is used for conveying the strip steel to the flying shear 1 for head and tail cutting, the speed of the pinch roll 2 is continuously changed along with the running of the strip steel, and the speed value of the pinch roll 2 is known. The speed of the strip steel can not be accurately known, and can be approximately considered to be equal to the speed of the pinch roll 2, and due to production equipment or operation process, in a continuous production process or due to accidental factors, uncertain deviation can occur between the speed of the pinch roll 2 and the actual speed of the strip steel, and the uncertain deviation causes that the head and the tail of the strip steel are too long or too short, so that the produced strip steel does not conform to the size of the process standard.
Because the speed change of the pinch roll 2 is not easy to measure, and in addition, the speed of the strip is not constant but has certain acceleration when the strip travels, the strip is easier to exceed the specified size range when the strip is cut head and tail. The inventor fully proves that the length data can be easily obtained by measuring the length of the cut strip steel, the size of the cut tail value can be easily adjusted by adjusting the size of the cut tail value in the operation control program, and whether the cut tail meets the requirement of the length of the strip steel or not can be further observed or measured. Therefore, the invention adjusts the length of the sheared strip steel by adopting a method of increasing the tailing compensation so as to produce the strip steel meeting the requirement.
The technical scheme provided by the invention has the following general idea: a functional relation is established by the factors influencing the tail cutting of the flying shear 1 and the actual cutting length. And further obtaining length compensation conditions for cutting the tail of the strip steel to determine a compensation value, and correcting the pre-cutting length during cutting, so that the actual cutting length of each section of strip steel can meet the set process threshold, and the purpose of improving the tail cutting precision of the flying shear 1 is achieved.
The technical solutions of the present application are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.
Fig. 1 is a schematic flow chart of a method for controlling shearing of a strip steel head and a strip steel tail according to an embodiment of the present invention, as shown in fig. 1, the method includes:
step 110: and acquiring the pre-shearing length of the head or the tail of the strip steel to be sheared by the flying shears 1.
The pre-shearing length refers to a specific distance of the strip steel extending into the flying shears 1, the specific distance is related to an operation control program, and the flying shears 1 are started to shear the strip steel extending into the flying shears 1 by the specific distance under the control of the operation control program.
Specifically, referring to fig. 4, the pre-cut length is obtained by a strip tracking system, and the strip tracking system identifies the distance that the leading edge of the strip extends into the flying shear 1 by the hot metal detector 3. The hot metal detector 3 detects the strip temperature detected by the strip's protrusion distance according to the trigger point of the hot metal detector 3. In the operation control program, the specific distance, i.e., the tracking distance is set to L meters (L is usually a fixed value such as 2.3 meters), the hot metal detector 3 is started to track the distance of the strip into the flying shears 1 at the lowest detection temperature, the strip tracking system determines the tracking distance by means of the speed of the pinch rolls 2, and the flying shears 1 are started to shear the current strip when the tracking distance is equal to L meters.
Step 120: and acquiring preset length compensation conditions and determining the strip steel tail cutting length compensation value.
The preset length compensation condition is that a functional relation is established between the speed of the pinch roll 2 influencing the actual speed of the strip steel and the actual shearing length of the strip steel, and the length compensation value of the strip steel tail cutting is determined by comprehensively considering the actual running acceleration of the strip steel; in particular, see steps 210-230.
Factors that affect the accuracy of crop-ends also include: the sensitivity of the hot metal detector 3; specifically, see the following description.
Step 130: and obtaining the actual shearing length according to the tail cutting length compensation value determined by the preset length compensation condition and the pre-shearing length.
Step 140: judging whether the actual shearing length is within the threshold range of the set process of the head or the tail of the strip steel to be sheared, and meeting the requirements of the production process;
step 150: if yes, finishing shearing.
Preferably, the method further comprises:
step 160: if not, adjusting the preset length compensation condition, re-confirming the tail cutting length compensation value, and repeating the step of obtaining the actual cutting length until the actual cutting length meets the threshold range of the set process and meets the requirements of the production process.
Preferably, before the step of obtaining the pre-shearing length of the head or the tail of the strip steel to be sheared by the flying shear 1, the method further comprises: the strip steel to be sheared is pretreated in the previous process procedure adjacent to shearing so as to reduce the floating iron oxide scale on the surface of the strip steel; wherein the pre-processing comprises: the iron scale on the surface of the strip steel is reduced by increasing air blowing, or the water vapor on the surface of the strip steel is reduced by increasing a fan, or the step of removing phosphorus on the surface of the strip steel is omitted.
The pretreatment steps are all used for improving the sensitivity of the hot metal detector 3, so that the contact point of the hot metal detector 3 can sense the temperature of the front edge of the hot rolled strip more sensitively. In the process field environment, water vapor exists in the field environment, and the water vapor is attached to the surface of the strip steel and then easily reacts with the surface of the strip steel to generate iron oxide, so that iron oxide scales float on the surface of the strip steel, and the detection sensitivity of the hot metal detector 3 is reduced, therefore, the water vapor on the surface of the strip steel can be reduced by adopting a mode of adding a fan on the field. Similarly, after the step of removing phosphorus is omitted, the contact surface area of the strip steel and water vapor is reduced, and the generation of iron scale can also be reduced. After the scale is generated, air blowing is added in front of the contact point of the hot metal detector 3 to blow off the scale floating on the surface of the strip steel, so that the temperature value detected by the contact point is closer to the temperature of the strip steel, and the detection precision is improved.
Preferably, the method further comprises: taking cooling measures for the hot metal detector 3, including: and a heat-preservation cotton wrapping and water cooling increasing mode is adopted.
In the method, after the metal detector 3 detects the temperature of the strip steel for a long time, when the current detection gap between the strip steel and the next strip steel exists, the temperature of the metal detector 3 cannot be quickly recovered to a detection reference value, so that an error is caused in the temperature detection of the next strip steel. The metal detector 3 is cooled by a water cooling mode, so that the metal detector 3 cannot feed back the temperature difference of different strip steels.
Preferably, a cooling measure is taken for the plate way of the detection point of the metal detector 3, a pore way is arranged at the plate way of the detection point of the metal detector 3, so that the temperature of the plate way of the detection point of the metal detector 3 is rapidly reduced to be below a detection reference value after high-temperature strip steel leaves, the hot metal detector 3 still detects the strip steel even if the strip steel leaves after the lowest detection temperature of the hot metal detector 3 is exceeded, in order to avoid the situation, a cavity is dug in the plate way of the detection point of the hot metal detector 3, the cavity is cooled by an air cooling way, and water vapor at the detection point of the metal detector 3 is blown away.
Fig. 2 is a schematic flow chart of obtaining the length compensation condition in the embodiment of the present invention, and as shown in fig. 2, the preset length compensation condition determination compensation value is obtained in the following manner:
step 210: acquiring a tail-cutting compensation value A1 based on the speed change value of the pinch roll 2 according to the speed change value of the pinch roll 2 influencing the running speed of the strip steel;
in order to eliminate the uncertainty deviation of the speed of the pinch rolls 2 from the actual speed of the strip, the inventors of the present application have found that the uncertainty deviation can be reduced by increasing the pressure of the pinch rolls 2 against the strip. Specifically, before the functional relationship between the speed of the pinch roll 2 influencing the strip steel advancing speed and the actual shearing length is obtained, the following steps are executed:
the roll feeding pressure of the pinch roll 2 is increased, wherein the roll feeding pressure ranges from 20KN to 50 KN. Specifically, another metal detector 4 is arranged at a position larger than L meters, and after the current strip steel passes through the hot metal detector 4 larger than L meters, the pressure of the pinch roll 2 is increased, so that the strip steel is in better contact with the pinch roll 2, and then after the strip steel advances to the flying shear 1, the actual speed of the strip steel is close to the speed of the pinch roll 2.
Step 220: acquiring a tail-cutting compensation value A2 based on the acceleration of the pinch roll 2 according to the acceleration of the pinch roll 2 influencing the advancing acceleration of the strip steel;
step 230: the preset tail-cutting length compensation value is the sum of the speed compensation value A1 of the pinch roll 2 and the acceleration compensation value A2.
Fig. 3 is a schematic flow chart of obtaining the speed compensation value a1 in the embodiment of the present invention, and as shown in fig. 3, the step of obtaining the speed compensation value a1 based on the speed variation value of the pinch roll 2 according to the speed variation value of the pinch roll 2 affecting the traveling speed of the strip steel includes the following steps:
step 211: and acquiring the functional relation between the speed of the pinch roll 2 influencing the advancing speed of the strip steel and the actual shearing length.
In the step, the actual shearing length is determined by the strip steel advancing speed (namely the actual speed of the strip steel), the strip steel advancing speed is influenced by the speed of the pinch roll 2, and the speed of the pinch roll 2 is adopted for representation because the actual speed of the strip steel is not easy to know.
The speed of the pinch roll 2 is taken as a fixed value V, the actual speed of the strip steel is a fixed value, and the speed deviation between the fixed value V and the actual speed of the strip steel is a fixed value D.
Speed V and actual shearing length of pinch roll 2
The functional relationship between the two is as follows:
wherein L is the pre-shearing length and L is a fixed value.
Step 212: and acquiring a speed compensation value A1 according to the change value of the speed of the pinch roll 2 and the functional relation.
Firstly, the change of the speed of the pinch roll 2 can cause the actual shearing length of the current strip steel
Actual cut length from the next strip
There occurs a deviation of the tail-cut value due to a change in the speed of the pinch roll 2. If the speed of the pinch roll 2 is changed for the same strip, the actual shearing length is caused
Deviation of the tail-cutting value from the pre-cutting length L occurs, so that the velocity compensation value A1 ═ Ls-L | ≈ Ls1-Ls2|, and the theory of A1 is derived as follows:
a1 (L/V1) D- (L/V2) D ═ DL (V2-V1)/V1 ═ V2 (DL/V1V2) Δ V, wherein L is a fixed value of the pre-shearing length, V1 is the speed value of pinch roll 2 of the current strip, V2 is the speed value of pinch roll 2 of the next strip, Δ V is V1-V2,
the change value of the speed of the pinch roll 2 of the current strip steel and the next strip steel is obtained. If the V1V2 is about 1.0, the function relationship between the speed compensation value A1 and the difference value of the actual speed of the strip steel is approximate to linear relationship.
Since the speed of the pinch roll 2 is linear with respect to the size of the tail, the speed compensation value a1 is Δ V × X, X is a proportionality coefficient, and Δ V is the speed variation of the pinch roll 2).
Referring to fig. 5, modeling is performed according to the actually detected speed and the size of the tail cut of the pinch roll 2, and it can be known that the speed change of the pinch roll 2 is linearly related to the size of the tail cut.
Preferably, the change value of the speed of the pinch roll 2 is specifically: and the difference value between the speed of the current strip steel pinch roll 2 and a fixed value and the difference value between the speed of the previous strip steel pinch roll 2 and the fixed value.
In order to eliminate the accumulation of the deviation caused by inaccurate speed acquisition of the pinch roll 2, the difference between the delta V and the V1-V2 is not directly compared with the V1 and the V2, but is compared with a fixed value such as 1.0(1.0 is an intermediate value of the speed of the pinch roll 2 in the production process), namely the difference between the delta V and the V1-1.0) - (V2-1.0), so that the difference between the speeds of the pinch roll 2 of two adjacent strip steels is only obtained, the deviation of the speed acquisition of the pinch roll 2 is not large and can be ignored, and the accumulation of the deviation caused by inaccurate speed acquisition of the pinch roll 2 can be eliminated.
Preferably, the step of obtaining an acceleration compensation value a2 based on the acceleration of the pinch roll 2 according to the acceleration of the pinch roll 2 affecting the traveling acceleration of the strip steel includes the following steps:
A2＝1/2*at2＝10*(L/V)2wherein, 1/2 at2Is a physical acceleration formula, s ═ vt +1/2 ═ at2Where vt is not used, t is the running time of the strip steel, and a is the acceleration, s displacement or distance. And t is L/V, L is the distance, and V is the strip steel speed.
Preferably, the threshold range of the set process is (-250250) mm, so as to avoid excessive tail cutting compensation caused by abnormal speed or acceleration of the pinch roll 2, and meanwhile, a bucket pit camera for observing the size of field tail cutting is amplified, the bucket is a device for containing the tail cutting, the bucket pit is used for placing the bucket, and the bucket pit camera is a monitoring camera for observing the size of the tail cutting, so that the size of the tail cutting can be better observed.
According to the shearing control method for the head and the tail of the strip steel, provided by the embodiment of the invention, the pressure of the pinch roll 2 at the tail of the strip steel is increased so as to reduce the difference between the speed of the pinch roll 2 and the speed of the strip steel. Simultaneously increasing the tail-cutting compensation value A1 related to the speed change of the pinch roll 2 and the tail-cutting compensation value A2 related to the acceleration of the strip steel. Compared with the prior art, the stability and the precision of the tail cutting are improved, the precision of the tail cutting is improved to +/-20 mm, accidents caused by the fact that the tail cutting is too small and is carried into a rolling mill are avoided, and the yield and the production operation time are improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A method for controlling the shearing of the head and the tail of a strip steel is characterized by comprising the following steps:
acquiring the pre-shearing length of the head or the tail of the strip steel to be sheared by the flying shear (1);
acquiring a preset length compensation condition and determining a compensation value;
obtaining the actual shearing length according to the compensation value determined by the preset length supplement condition and the pre-shearing length;
judging whether the actual shearing length is within the threshold range of the set process of the head or the tail of the strip steel to be sheared, and meeting the requirements of the production process;
if yes, finishing shearing;
if not, adjusting the preset length compensation condition, and repeating the step of obtaining the actual shearing length until the actual shearing length meets the threshold range of the set process and meets the requirements of the production process;
wherein, the preset length compensation condition determination compensation value is obtained by adopting the following mode:
according to the change value of the speed of the pinch roll (2) influencing the advancing speed of the strip steel, obtaining a speed compensation value A1 based on the change value of the speed of the pinch roll (2);
acquiring an acceleration compensation value A2 based on acceleration of the pinch roll (2) according to the acceleration of the pinch roll (2) influencing the advancing acceleration of the strip steel;
the preset length compensation condition determines a compensation value as the sum of the velocity compensation value a1 and the acceleration compensation value a 2.
2. The strip steel head and tail shearing control method according to claim 1, wherein before the step of obtaining the pre-shearing length of the strip steel head or tail to be sheared by the flying shears (1), the method further comprises:
the strip steel to be sheared is pretreated in the previous process procedure adjacent to shearing so as to reduce the floating iron oxide scale on the surface of the strip steel; wherein the pre-processing comprises: the iron scale on the surface of the strip steel is reduced by increasing air blowing, so that the step of removing phosphorus on the surface of the strip steel is omitted or a fan is added to reduce water vapor on the surface of the strip steel.
3. The method for controlling shearing of the head and the tail of the strip steel as claimed in claim 1, further comprising:
taking cooling measures for the hot metal detector, comprising: adopt the cotton parcel of heat preservation and increase water-cooling mode, to the measure of cooling down of railway: and arranging a duct at a plate channel of a detection point of the metal detector to increase air cooling.
4. The strip steel head and tail shearing control method according to claim 1, wherein the step of obtaining the speed compensation value A1 based on the speed change value of the pinch roll (2) according to the speed change value of the pinch roll (2) influencing the travelling speed of the strip steel comprises the following steps:
acquiring a functional relation between the speed of a pinch roll (2) influencing the advancing speed of the strip steel and the actual shearing length;
and acquiring a speed compensation value A1 according to the change value of the speed of the pinch roll (2) and the functional relation.
5. The strip steel head and tail shearing control method according to claim 4, characterized in that the change value of the speed of the pinch rolls (2) is specifically as follows:
the difference value between the speed of the current strip steel pinch roll (2) and a fixed value and the difference value between the speed of the previous strip steel pinch roll (2) and the fixed value.
6. The strip head and tail shearing control method according to claim 4, characterized in that the following steps are carried out before the functional relation between the speed of the pinch rolls (2) influencing the strip travelling speed and the actual shearing length is obtained:
increasing the feeding pressure of the pinch roll (2), wherein the pressure of the pinch roll ranges from 20KN to 50 KN.
7. The method for controlling the shearing of the head and the tail of the strip steel as claimed in any one of claims 1 to 6, wherein the threshold range of the set process is (-250, 250) mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910221612.6A CN110064666B (en) | 2019-03-21 | 2019-03-21 | Strip steel head and tail shearing control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910221612.6A CN110064666B (en) | 2019-03-21 | 2019-03-21 | Strip steel head and tail shearing control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110064666A CN110064666A (en) | 2019-07-30 |
| CN110064666B true CN110064666B (en) | 2020-11-20 |
Family
ID=67366486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910221612.6A Active CN110064666B (en) | 2019-03-21 | 2019-03-21 | Strip steel head and tail shearing control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110064666B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110883101B (en) * | 2019-10-23 | 2021-04-16 | 首钢集团有限公司 | Method and device for controlling thickness of strip steel |
| CN110842024B (en) * | 2019-10-25 | 2021-04-23 | 首钢京唐钢铁联合有限责任公司 | Method and device for shearing strip steel |
| CN112974533B (en) * | 2019-12-12 | 2022-10-14 | 上海梅山钢铁股份有限公司 | Strip steel head and tail length optimized shearing method based on hot rolling incoming material data |
| CN111804984B (en) * | 2020-06-30 | 2021-08-31 | 首钢智新迁安电磁材料有限公司 | Tape tail slitting positioning control method |
| CN113042546B (en) * | 2021-02-25 | 2022-08-19 | 首钢京唐钢铁联合有限责任公司 | Method and device for tracking strip steel head |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6343709A (en) * | 1986-08-06 | 1988-02-24 | Kobe Steel Ltd | Cutting length control device for flying shear |
| CN102513355B (en) * | 2011-12-09 | 2014-07-02 | 中冶南方（武汉）自动化有限公司 | Control method for flying shear tail-shearing of rod wire |
| CN105195807B (en) * | 2015-09-11 | 2017-08-29 | 北京首钢股份有限公司 | A kind of flying shear cutting method |
| CN107433287B (en) * | 2016-05-26 | 2019-06-25 | 宝山钢铁股份有限公司 | A kind of hot-rolling flying shears shear the dynamic control method of initial position end to end |
| CN106077093B (en) * | 2016-06-22 | 2017-12-26 | 首钢京唐钢铁联合有限责任公司 | Flying shear tail cutting precision control method and device |
-
2019
- 2019-03-21 CN CN201910221612.6A patent/CN110064666B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110064666A (en) | 2019-07-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110064666B (en) | Strip steel head and tail shearing control method | |
| CN103962384B (en) | A kind of continuous hot-rolling mill dynamic shearing control method | |
| CN107433287B (en) | A kind of hot-rolling flying shears shear the dynamic control method of initial position end to end | |
| CN106077093B (en) | Flying shear tail cutting precision control method and device | |
| CN106623421A (en) | Continuous production method and line for variable-thickness profile | |
| CN105234189A (en) | Slab sickle bending control system and method used for roughing mill | |
| CN104950802B (en) | Continuous hot-rolling mill flying shear dynamic shearing amount control method | |
| CN104307892A (en) | Method for strip head correction in continuous rolling strip threading process | |
| CN106984651A (en) | Online control system for improving thickness control precision of rolled piece | |
| US20170014880A1 (en) | Simple pre-control of a wedge-type roll-gap adjustment of a roughing stand | |
| TWI602624B (en) | Method for manufacturing hot-rolled steel sheet, apparatus for setting position of steel plate, setting method of steel plate cutting position, and method for manufacturing steel plate | |
| CN113083899B (en) | Novel bar multiple-length sectional control method | |
| CN109013712A (en) | Reduction ratio compensation method when cold continuous rolling dynamic variable specification | |
| CN104226698A (en) | Feed-forward control method for finish rolling temperature for band steel | |
| EP0055781B1 (en) | Method for controlling the automatic rolling of pipes in a reeling mill | |
| CN106825740B (en) | A kind of cutting system and method | |
| EP3233317B1 (en) | A roller guide and a method for guiding stock | |
| CN107427870B (en) | Rolling mill with optimized determination of cutting points | |
| US11745235B2 (en) | Method and device for controlling a stretch reducing rolling mill for wall thickness compensation | |
| CN110842024B (en) | Method and device for shearing strip steel | |
| CN113492154B (en) | Hot rolling flying shear shearing control method based on multi-speed detection compensation | |
| EP1322433B1 (en) | Sheet width control method in hot rolling | |
| KR101536915B1 (en) | Apparatus for operating crop shear and control method thereof | |
| JP4569093B2 (en) | Method for detecting solidification completion position of continuous cast slab | |
| KR101442903B1 (en) | Method for dividing hot rolled strip and system thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |