阅读说明：本技术 一种酸轧轧机紧急变规格的方法 (Method for emergency specification change of acid rolling mill ) 是由 赵刚 浦杰 曹垒 秦雯嘉 于 2021-07-21 设计创作，主要内容包括：本发明涉及一种酸轧轧机紧急变规格的方法,包括以下步骤：步骤S1：以轧机的常规最低厚度启车；步骤S2：设定轧制的目标厚度；步骤S3：第一次计算：轧机二级系统用数学模型对轧机控制参数的设定值进行计算；步骤S4：将步骤S3设定值发送至一级系统,轧制材料；步骤S5：第二次计算：测量轧机出口材料的厚度,计算与步骤S2设定轧制的目标厚度的偏差,并输入自适应控制模型,进行第二次计算,调整步骤S3参数的设定值；直到偏差消除；得到最终设定值；步骤S6：二级系统将计算得到的最终设定值传送到一级系统；一级系统按照最终设定值调整轧机,并检测出口的材料厚度。本发明减少酸轧轧机轧制极薄钢板过程中,轧机启车后的不命中量的问题。(The invention relates to a method for emergency specification change of a sour rolling mill, which comprises the following steps: step S1: starting the rolling mill at the conventional minimum thickness of the rolling mill; step S2: setting a target rolling thickness; step S3: the first calculation is as follows: the second-level system of the rolling mill calculates the set value of the control parameter of the rolling mill by using a mathematical model; step S4: sending the set value of the step S3 to a first-level system to roll the material; step S5: and (3) calculating for the second time: measuring the thickness of the outlet material of the rolling mill, calculating the deviation from the target thickness set in the step S2, inputting the deviation into an adaptive control model, performing second calculation, and adjusting the set value of the parameters in the step S3; until the deviation is eliminated; obtaining a final set value; step S6: the secondary system transmits the final set value obtained by calculation to the primary system; and the primary system adjusts the rolling mill according to the final set value and detects the thickness of the material at the outlet. The invention reduces the problem of miss amount of the rolling mill after starting in the process of rolling the ultrathin steel plate by the acid rolling mill.)

1. A method for emergency specification change of a sour rolling mill is characterized by comprising the following steps:

step S1: starting the rolling mill at the conventional minimum thickness of the rolling mill;

step S2: setting a target rolling thickness;

step S3: the first calculation is as follows: the second-level system of the rolling mill calculates the set value of the control parameter of the rolling mill by using a mathematical model;

step S4: sending the set value of the step S3 to a first-level system to roll the material;

step S5: and (3) calculating for the second time: measuring the thickness of the outlet material of the rolling mill, calculating the deviation from the target thickness set in the rolling process in the step S2, inputting the deviation into an adaptive control model, performing second calculation, and adjusting the set value of the parameter in the step S3; until the deviation is eliminated; obtaining a final set value;

step S6: the secondary system transmits the final set value obtained by calculation to the primary system; and the primary system adjusts the rolling mill according to the final set value and detects the thickness of the material at the outlet.

2. The method for emergency gauge change of a sour rolling mill of claim 1, wherein: the specific step of the first calculation in step S3 includes:

step S3.1: determining input parameters: original PDI data of a steel coil product and state parameters of a rolling mill, wherein the state parameters comprise no-load roll gaps;

step S3.2: establishing a bounce equation: outputting the thickness as no-load roll gap plus rolling bounce value;

step S3.3: and obtaining the control parameters of the rolling mill.

3. The method for emergency gauge change of a sour rolling mill of claim 2, wherein: and S3.3, the rolling mill control parameters comprise the maximum rolling speed, threading data and control parameters during dynamic transition.

4. The method for emergency gauge change of a sour rolling mill of claim 1, wherein: the conventional minimum thickness of the rolling mill described in step S1 is 0.24 mm.

5. The method for emergency gauge change of a sour rolling mill of claim 1, wherein: the target thickness of step S2 is less than the conventional minimum thickness of the mill.

6. The method for emergency gauge change of a sour rolling mill of claim 1, wherein: further comprising step S7: when the deviation of the material thickness at the outlet of the rolling mill and the set value is larger than the expectation, returning to the step S5; and when the deviation of the material thickness at the outlet of the rolling mill and the set value is smaller than the expectation, manually executing steel coil slitting.

Technical Field

The invention relates to the technical field of emergency specification change of rolling mills, in particular to a method for emergency specification change of a sour rolling mill.

Background

The dynamic gauge change (FGC) is a gauge change of the strip steel during the rolling process, i.e. the gauge change of the steel grade, thickness, width, etc. of two adjacent rolls of strip steel is realized by dynamically adjusting parameters such as roll gap, speed, tension, etc. under the condition of no shutdown of the continuous rolling mill set. The dynamic specification change can roll the raw material strip steels with different specifications into the finished strip steels with the same specification, can roll the raw material strip steels with different specifications into the finished strip steels with different specifications, and can roll the strip steels with the same specification into the finished strip steels with different specifications by bundling. The procedures of threading and drifting of each coil and large-range acceleration and deceleration are omitted in the rolling process. This not only improves the production of the unit, but also significantly improves the quality of the product.

In the dynamic specification changing process, a wedge-shaped transition area is inevitably formed when one specification is changed into another specification, the longest length of the wedge-shaped transition area cannot be longer than the distance between two racks, otherwise, the two racks roll the wedge-shaped area simultaneously, and the tension is controlled more difficultly.

One way of controlling the dynamic variable-gauge rolling parameters is at the process control level. The change of the set value is implemented by the process computer step by step, and the transition of the specification is realized by the control system of the thickness, the tension and the like of the basic automation level. For example, the roll gap of A material is set to S₁(the 5 th frame work roll) and the material B is S₂(5 th frame work roll), the amount of fluctuation is requiredIn multiple steps, i.e. each time the variation is changedSimilarly, the speed setting and tension setting are also performed in steps, and the amount of fluctuation per step is made small. Since the variation is small, the parameters can be calculated by adopting a linearized incremental model. Another approach is to resolve at the basic automation level. The process computer is sent down 4 times at a time or less and is sent down onceThe pressure reduction rate r varies and changesChanging value, sending down in 4 times, the reduction rate r, r₁→r₂→r₃→r₄First time down sending r₂-r₁Amount of variationAnd so on. And the basic automation ensures that the rapid transition of the thickness and the fluctuation of the tension do not exceed the limit through a thickness and tension comprehensive control system. Due to the large variation, an incremental model can not be adopted any more, and a nonlinear full-scale model is required for calculation.

The Emergency variable specification (Emergency FGC) of a rolling mill realizes variable specifications of various thicknesses on the same strip steel under the condition that the rolling mill does not stop. In the prior art, the dynamic specification change of the rolling mill can be realized, namely the rolling mill can change the parameters of a rolled steel plate under the condition of no shutdown. However, in the prior art, the steel coil and the steel coil are judged by depending on the steel plate welding line, so that the specification can be changed only when the rolling of one steel coil is finished and the steel coil enters the next coil. When rolling an extremely thin steel plate, since the thickness of the extremely thin steel plate is less than the minimum thickness of the starting vehicle, the thickness of the steel plate needs to be changed by dynamically changing the specification. And because the plate needs to bear larger stress when starting the vehicle, the vehicle generally needs to be started by a thick head, namely, the rolling is started by a thicker thickness. And dynamically changing the specification in the midway to change the thickness to the target thickness of the extremely thin steel plate. The automobile can be thickened before parking and thinned after starting, so that the probability of belt breakage is reduced.

Generally, the coil with the specification is produced continuously, but the field problem causes the shutdown of a rolling mill section, such as abnormal conditions caused by roll printing roll changing, plate shape and air blowing, when the rolling mill is restarted, the on-line coil with the thickness of less than 0.24mm needs to be wound tightly before and after a welding seam carried by the rolling mill section through a program, the whole coil needs to be changed into the thickness of 0.24mm, so that 1 coil is started each time, the thickness of about 15 tons is not hit, the thickness of the coil with the specification of less than 0.24mm per month is wound, and the coil is wound about 700 rolls per month, the rolling mill is stopped abnormally and then started, the thickness of the coil with the thickness of about 30 coils in the range is not hit, the coil with the specification of about 450 tons is not hit, the loss of 9 ten thousand yuan per month is calculated according to the hit and not hit ton steel per ton, in addition, the miss of 450 tons seriously influences the quality index and the delivery of the sour rolling, and the problem needs to be solved urgently.

Disclosure of Invention

Aiming at the defects of the prior art, the invention discloses a method for changing the specifications of a sour rolling mill in an emergency.

The technical scheme adopted by the invention is as follows:

a method for emergency specification change of a sour rolling mill comprises the following steps:

step S1: starting the rolling mill at the conventional minimum thickness of the rolling mill;

step S2: setting a target rolling thickness;

step S3: the first calculation is as follows: the second-level system of the rolling mill calculates the set value of the control parameter of the rolling mill by using a mathematical model;

step S4: sending the set value of the step S3 to a first-level system to roll the material;

step S5: and (3) calculating for the second time: measuring the thickness of the outlet material of the rolling mill, calculating the deviation from the target thickness set in the rolling process in the step S2, inputting the deviation into an adaptive control model, performing second calculation, and adjusting the set value of the parameter in the step S3; until the deviation is eliminated; obtaining a final set value;

step S6: the secondary system transmits the final set value obtained by calculation to the primary system; and the primary system adjusts the rolling mill according to the final set value and detects the thickness of the material at the outlet.

The method is further technically characterized in that: the specific step of the first calculation in step S3 includes:

step S3.1: determining input parameters: original PDI data of a steel coil product and state parameters of a rolling mill, wherein the state parameters comprise no-load roll gaps;

step S3.2: establishing a bounce equation: outputting the thickness as no-load roll gap plus rolling bounce value;

step S3.3: and obtaining the control parameters of the rolling mill.

The method is further technically characterized in that: and S3.3, the rolling mill control parameters comprise the maximum rolling speed, threading data and control parameters during dynamic transition.

The method is further technically characterized in that: the conventional minimum thickness of the rolling mill described in step S1 is 0.24 mm.

The method is further technically characterized in that: the target thickness of step S2 is less than the conventional minimum thickness of the mill.

The method is further technically characterized in that: further comprising step S7: when the deviation of the material thickness at the outlet of the rolling mill and the set value is larger than the expectation, returning to the step S5; and when the deviation of the material thickness at the outlet of the rolling mill and the set value is smaller than the expectation, manually executing steel coil slitting.

Compared with the prior art, the technical scheme of the invention has the following advantages:

according to the invention, the specification can be changed in the rolling process of the first steel coil by actively changing the specification after starting, the loss of the steel coil is reduced to be within about 1000m and less than 1.5 tons, and the loss of the steel coil in each starting process is greatly reduced. Therefore, the productivity of the machine is saved, the raw materials are saved, and the production efficiency is improved.

Drawings

In order that the present disclosure may be more readily and clearly understood, reference will now be made in detail to the present disclosure, examples of which are illustrated in the accompanying drawings.

FIG. 1 is a flow chart of the present invention.

Figure 2 is a prior art 0.18mm thickness recording.

Figure 3 is a prior art 0.24mm thickness recording.

FIG. 4 is a thickness chart of the same-winding steel strip of the present invention from 0.24mm to 0.18 mm.

Detailed Description

The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.

FIG. 1 is a flow chart of the present invention. As shown in fig. 1, a method for rapidly changing the specifications of a sour rolling mill comprises the following steps:

step S1: starting the mill at the conventional minimum thickness of the mill. A conventional minimum thickness is 0.24 mm.

Step S2: the target thickness of rolling is set, which is less than the conventional minimum thickness of the rolling mill, i.e. the target thickness < 0.24 mm.

Step S3: the first calculation is as follows: and the second-level system of the rolling mill calculates the set value of the control parameter of the rolling mill by using a mathematical model.

Step S3.1: determining input parameters: original PDI data of a steel coil product and state parameters of a rolling mill, wherein the state parameters comprise no-load roll gaps.

Step S3.2: establishing a bounce equation: the output thickness is no-load roll gap plus rolling bounce value.

Step S3.3: and obtaining the control parameters of the rolling mill. The control parameters comprise maximum rolling speed, threading data and control parameters during dynamic transition.

Step S4: the set value of step S3 is sent to the primary system, and the material is rolled.

Step S5: and (3) calculating for the second time: and measuring the thickness of the outlet material of the rolling mill, calculating the deviation from the target thickness set in the step S2, inputting the deviation into an adaptive control model, performing second calculation, and adjusting the set value of the parameter in the step S3. Until the deviation is eliminated. And obtaining a final set value.

Step S6: and the secondary system transmits the final set value obtained by calculation to the primary system. And the primary system adjusts the rolling mill according to the final set value and detects the thickness of the material at the outlet.

Step S7: when the deviation of the material thickness from the set value at the outlet of the rolling mill is larger than expected, the process returns to step S5. And when the deviation of the material thickness at the outlet of the rolling mill and the set value is smaller than the expectation, manually executing steel coil slitting.

Example 1:

FIG. 4 is a thickness chart of the same-winding steel strip of the present invention from 0.24mm to 0.18 mm. As shown in fig. 4, in this embodiment, the minimum start-up thickness of the rolling mill is 0.24mm, and the thickness of the steel strip to be rolled is 0.18mm, which is smaller than the minimum start-up thickness of the rolling mill. In such a working environment, the rolling mill may need to be restarted for the first start, material breakage, deformation, etc. In order to roll 0.18mm strip steel without depending on weld detection, when starting a vehicle and regenerating, the original 0.18mm thickness is increased by 0.06mm to compensate to 0.24mm, the vehicle starting production is stable for a period of time, the specification is changed rapidly by manual dry pre-tightening, the manual increase of the 0.06mm thickness compensation is cancelled, and the first-level data information is sent to the second level, so that the situation that one steel coil is changed from 0.24mm to 0.18mm rolling mill to change the specification rapidly is realized.

Thus, the thickness of the missed roll is changed from the original whole roll (about 10000m, 15 tons) to an emergency gauge-changing thickness missed roll which is reduced to a small roll (within about 1000m, less than 1.5 tons), namely, the missed roll of the vehicle is started for 15 tons and reduced to less than 1.5 tons, and the missed roll of 450 tons and 45 tons every month, so that the missed loss of at least 8.1 ten thousand yuan is recovered. In addition, the strip breakage of a rolling mill during stopping and starting can be well avoided through the emergency thickness specification of the same steel coil, and the normal and stable production of thin materials is ensured.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.