JPS62134107A - Measuring method for rolling data - Google Patents

Abstract

PURPOSE:To judge with high reliability to improve the measuring accuracy for rolling data, and also to improve the accuracy of the plate thickness set value by judging whether the measured value of rolling data is usual or unusual by comparing the measured value with the predicted value obtained by a model arithmetic equation. CONSTITUTION:A stock 1 to be rolled is rolled by rolling rolls 2 and 2'; a plate thickness in the inlet side, a plate thickness in the outlet side, a plate width, a plate temp., and a rolling speed are measured by a plate thickness gage 4, a plate thickness gage 5, a plate width gage 6, a plate temp. thermometer 7, and a speed meter 8, respectively. And those measured values are sent to a computing element 9, which calculates a predicted rolling load using a rolling load model arithmetic equation and sends the predicted load to an computing element 10, which judges that the measured rolling load value is usual or unusual by comparing the measured value with the predicted rolling load value. By this method, the measuring accuracy for rolling data is improved because the judgment whether the measured value of rolling loads is usual or unusual is performed with consideration for rolling conditions of the rolled stock.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to the rolling load, plate temperature, and plate thickness of rolled materials.

The present invention relates to a rolling data measuring method for measuring rolling data such as sheet width.

[Technical background of the invention and its problems]

Rolling data includes rolling load, rolling torque, and plate thickness.

This is a value that indicates the rolling condition of the rolled material, such as plate width, plate crown, plate temperature, etc., and is measured using a measurement sensor.

These rolling data are used to evaluate the rolling performance of the material in question, so the values must be correct.If the measured values are incorrect due to an abnormality in the measuring sensor equipment, a shift in the position of the measuring sensor, etc. , it must be correctly recognized that the value is an abnormal value.

Conventionally, the method of determining whether rolling data is normal or abnormal is to set upper and lower limits for each measurement sensor in advance, and if the sensor manual force value is within these upper and lower limits, it is normal, and if it exceeds the upper or lower limits, it is normal. It was determined that it was abnormal. However, this method has the disadvantage that, since the upper and lower limits are determined in advance, detailed checks depending on the rolling state cannot be performed and only rough checks are made.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned conventional problems, and its objectives are 1. to provide a rolling data measuring method that improves the accuracy of measuring rolling state values of the relevant rolled material.

[Summary of the invention]

In order to achieve the above-mentioned object, the rolling data measuring method according to the present invention uses a rolling formula model to preliminarily determine the value of the data to be measured for the rolled material, and then compares this predicted value with the value actually measured by the measuring sensor. Its feature is that it can determine whether the measured data is normal or abnormal by comparing it with the measured value.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIG.

The material to be rolled 1 is rolled by rolling rolls 2, 2'.

The inlet side plate thickness is measured with a plate thickness meter 4, the outlet side plate thickness is measured with a plate thickness meter 5, the plate width is measured with a plate width meter 6, the plate temperature is measured with a plate thermometer 7, and the rolling speed is measured with a speed meter 8. sent to.

There are various types of rolling load model calculation formulas, but
- As an example, use the following rolling load model calculation formula.

P=b-,,,,4R・(H-h)・Qp・
・(1)-h H...■ kfm:a1. , G2. ;G3・ea41
,,, G4) ε=ρ. -・・■ ■( Here P: Rolling load b: Plate width k fm 'Average deformation resistance ■ Roll: Work roll radius H: Input thickness h: Output thickness QP: Rolling force function r: Reduction ratio T: Plate Temperature V: Rolling speed ε: Logarithmic strain;: Strain rate A1-A7. From the constant expression of a1-a4 = equation (υ~0, it can be seen that P is a function of H, h, b, v, and T. .

The calculator 9 calculates the predicted rolling load P0 from equations (1) to (2) and sends it to the calculator 10. The actual rolling load pA is measured by the load cell 3 and sent to the calculator 10.

The calculator 10 determines whether the measured rolling load value P is normal by comparing the predicted rolling load value P0 and the measured value pA.

Determine abnormality. Various methods can be considered for determining whether the condition is normal or abnormal, but in this case, it is determined that the condition is normal if the following formula (2) is satisfied, and abnormal if it is not satisfied.

However, β: Constant value Through the above processing, it is possible to determine whether the measured rolling load value is normal or abnormal, taking into consideration the rolling state of the relevant rolled material, and it is possible to improve the measurement accuracy of rolling data.

In the above, the rolling load was explained as an example, but next, the measurement of plate temperature measured by a plate thermometer will be explained as an example.

The following model equation is used to calculate the drop in plate temperature due to air cooling.

Here, T: Temperature of the plate after the time when the initial plate temperature is TI TA: Temperature of the plate when the ambient temperature T is the initial plate temperature t: Elapsed time h: Thickness of the rolled plate α: Air cooling heat transfer coefficient C: Specific heat ρ of rolled material: From the specific gravity of rolled material 2〇, T is the parameter TA, TI, t, h, α.

Of these parameters, TA, αlc+ρ can be considered as constant values, and those that change depending on the rolling state are TI, t,
It is h.

Next, another embodiment of the present invention will be described using FIG. 2.

The plate thickness of the material to be rolled 1 is measured by a plate thickness gauge 11, and the plate temperature is measured by a plate thermometer 12.
is measured and sent to the storage device 13. Also, at this timing, the timer 14 starts and starts measuring time. When the rolling progresses I1 and the plate temperature is determined 1111 by the plate thermometer 15, this measured value -rA is sent to the calculator 17.

Also, the timer 14 is stopped and the value of the timer 1 is sent to the arithmetic unit 16. Plate thickness and plate thermometer 1 from storage device 13
The temperature measured at step 2 is sent to the computing unit 1G. The arithmetic unit 16 calculates the plate temperature prediction value T0 at the plate thermometer 15 from equation (8) and sends it to the arithmetic unit 17. The calculation unit 17 calculates the plate temperature measurement value T.
By comparing A and the predicted value T0, the measured plate temperature T
Determine whether A is normal or abnormal.

Up to now, we have explained an example in which the predicted value of the measured value of the target rolling data is calculated using a rolling formula model using the actual measured values of other rolling data as input, but the predicted value of the measured value of the rolling data mentioned above has been explained. A similar effect can be obtained by using the path schedule calculation value as .

In this example, rolling load and plate temperature were explained as examples, but it goes without saying that the present invention can be easily applied to measurement of other rolling data such as rolling torque, plate thickness, plate width, and plate crown.

〔Effect of the invention〕

According to the invention, the measurement values of rolling data are normal.

Abnormality is determined by comparing this measured value with the predicted value calculated using the rolling formula model, which allows for highly accurate determination.As a result, the measurement accuracy of rolling data improves, and as a result, the plate thickness An improvement in setting value accuracy can be expected.

[Brief explanation of drawings]

FIGS. 1 and 2 are block diagrams of a rolling system for explaining an embodiment of the present invention. 1... Rolled material, 2, 2'... Roll roll 3
...Load cell, '4,5.11...Plate thickness total 6
...Plate width gauge, 7.12.15...Plate thermometer 8...Speed meter, 9, 10.16.17...
・Arithmetic unit 13...Memory device rm14...Timer agent Patent attorney Noriyoshi Chika Hirofumi Mitsumata

Claims (1)

[Claims] A method of measuring rolling pressure data for rolled materials, in which the actual value measured by a sensor is compared with the predicted value obtained using a model calculation formula, and if the comparison result satisfies a predetermined relationship, the actual value is determined to be normal. Data measurement method.