SU1662723A1 - Method of determining inertia moment of strip coil during coiling - Google Patents

Abstract

The invention relates to rolling production, in particular to the determination of the striking moments of coil strips during the winding process. The purpose of the invention is to improve the accuracy and simplify the implementation of the method. The current strip thickness and the length of the coil are measured, and the roll moment of the roll is determined by the dependence given in the claims. 1 tab., 6 Il.

Description

The invention relates to rolling production, in particular to the determination of the striking moments of coil strips during the winding process.

The purpose of the invention is to improve the accuracy and simplify the implementation of the method.

Figure 1 shows a device for carrying out the method; Figures 2-6 illustrate the algorithm of operation of the device for implementing the method.

The rolling moment of a roll in this method is determined by the dependence

Q -ZL fejhrfrh fef- hje a h),

where G is the total mass of the roll;

D is the outer diameter of the roll;

i is the sequence number of the coil;

n is the number of turns at the moment of determining the rolling moment of the roll;

hi is the average thickness of the 1st coil:

q is the acceleration of free fall; y is the density of the strip material; b - the width of the coiled strip; t is the length of the i-ro turn of the roll.

Known that the flywheel moment

GD2 4ql, (1)

where I is the moment of inertia

In turn, the moment of inertia is equal to

l m pr, (2)

where t is body mass;

p is the radius of inertia. Since the coil turn is a full straight round cylinder, the square of its inertia radius is R

(3)

1 where R is the outer radius of the coil;

g - the inner radius of the coil.

Express the outer and inner oadisusy coil coil through its length so

R.

-sh-s-1.

then the expression (3) can be written as

I / Ј; and 2

L2 2tG w; U; -27E; b,) p. ,.(five)

The mass of the coil can be represented as № П, J-.b-ITfR2-), (6)

with

vga

ABOUT

yo

Xi

Yu

S

where v is the volume of the coil,

and taking into account the expression (A) we get

t y, b (e; b- (1GI).

Finally, expression (1) has the form

GDS (eiV hWarWh "X),

(eight)

and the roll swing torque is determined according to the following relationship

QD

P

R

{(

TT ((ef-ttth; E; + 2ffV). (9)

Thus, the length of the coil is used as a parameter of the coil turn when determining the swing moment.

This circumstance has a number of significant advantages: first, the accuracy of the measurement of the length of the coil is not affected by disturbing effects, leading to a decrease in the accuracy of the measurement of the radius, and this makes it possible to increase the accuracy of the measurement of the ground moment; secondly, the radius increment is almost close to the thickness of the coiled strip and in absolute value is less than the absolute increment of the coil length.

This circumstance makes it possible to reduce the requirement for accuracy in measuring the length when the relative measurement error of the turn radius is equal, for example, when winding a strip 5 mm thick, a drum radius of 0.5 m, the increment of the radius is 5 mm, and 4 mm, and with the required error of measuring the increment, say, 10%, the accuracy of measuring the radius should be 0.5 mm, while the accuracy of measuring the length should be 3.14 mm. Measuring the length of a coil turn can be performed using technical means with which all rolling mills are equipped, and does not require the installation of additional sensors and, therefore, the implementation of the method is simplified.

Consider a numerical example of the implementation of the method (option II), while to compare the results obtained, we will additionally carry out the calculation (option I) according to formulas (1), (2), (3) and (6).

Let us assign the following initial data: hi 0.005 m, L 1.5 m, d 9.81 m / s2, at 7850 kg / m3, the number of turns of 10. For simplicity, we take the coefficient of the coiling density equal to 1.

The calculations were carried out on a mini-computer of the type CM 1420.

The results of the calculations are given in the table,

The results of the calculations show their good agreement, which confirms the possibility of using (7) the method to determine the landing moment

5 rolls in the process of winding.

The device consists of a thickness meter 1, pulse sensors 2 and a static current 3 tons of nudity rollers, pulse sensors 4 and a static current 5 of forming rollers, pulse sensors 6 and a static current 7 of the reel drum, a computing unit 8. Outputs of the thickness meter 1 and sensors 2 -7 are connected to the output of the computing unit 8, except

Moreover, the values of the speed Vn, the width b and the thickness h of the strip from the rolling mill automated control system are fed to the input of the computing unit 8, and before starting work using the manual input unit to the computing unit

20 8 are given the values of the radii of the pulleys of the RTp rollers, the forming rollers of Rfr, the drum of the winder R & M, the numerical value, the density coefficient K, the number of pulses Mtr, Mfr, Mbm corresponding to one

25 turns of the pulse sensors D2, D4, D5, and other constants.

The device works as follows.

Upon receipt from the ACS of the values of the values of the thickness and width of the rolled strip computing unit 8 calculates and remembers the length of each turn of the roll, calculated from the dependence

hh

. + T) (y)

where fn is the length of the nth turn;

K - coil density coefficient.

When a band enters the zone of operation of the meter 1, the latter generates a signal about its work and is polled, and the number of polls D1 is determined, respectively, for each turn according to the next

35

40

R,

45

50

to the following expression:

 P1

where Tdch is the time of one D1 survey.

Sum the values of the current thickness and determine the average value of the thickness of the coil according to the expression

, B, ... + b

h; -,;

m

(12)

55 where hi,.,. Hm is the current value of the strip thickness;

m is the number of polls.

The received hi data is stored for use in calculating the flywheel moment.

.

35

R,

to the following expression:

 P1

where Tdch is the time of one D1 survey.

Sum the values of the current thickness and determine the average value of the thickness of the coil according to the expression

, B, ... + b

h; -,;

m

(12)

5 where hi,.,. Hm is the current value of the strip thickness;

m is the number of polls.

The received hi data is stored for use in calculating the flywheel moment.

After being transported along the roller table (not shown), the strip enters the pull rollers and then is captured by the winder drum and the forming roller, the strip capture moments by pull and forming rollers and the winder drum are fixed by sensors 3, 5 and 6, respectively, these signals serve to synchronize further the operation of the computing unit 8. At the time of the sensor 5 triggered, the counting of pulses from the sensors 2, 4, 5 begins, and accordingly, the calculation of 8 according to

o „l. R

TO; . (13)

where Mfr - the number of pulses of the sensor 4;

MBM number of sensor pulses &.

Under the condition of the MBM, the value of h is memorized and the value of the ground moment calculated according to expressions (8) and (9) is fed to the winder drive control system to compensate for the dynamic component of the drive current.

In the absence of a signal from the D5 sensor (the forming rollers are diluted when they thin coil of thin strips after they wind several turns and reduce to the end of the winding), h is calculated according to

G ol

e -2

(14)

where hTp is the number of pulses D2;

PBM - the number of pulses D6.

The basis for calculating the length of the coil is the principle given in expression (4), where it is indicated that the error in measuring the length using this principle is less than 0.1%.

Upon completion of the coiling of each individual coil, its swing moment is calculated, added to the swing moment value of the previous coils, and the result is transmitted to the coil tension control system,

Before the operation of the device, scale factors, values of the radii of the mechanisms, all constants used in the calculations are entered into it.

The algorithm operates as follows.

1. Enter the values b and h, go to step 2.

2. Calculate and remember the value of the length of the coil Pn, go to step 3.

3. Increase the counter C1 of the number of values of Pn by one, go to step 4.

4. Determine whether the D1 sensor is working, if yes, go to step 6, otherwise - to step 5.

5. To determine, equals 1 sign C, if yes, then go to step 13, otherwise - to step 2.

6, Determine if 1 sign C is equal, if yes, go to step 8, otherwise go to step 7.

7. Assign the value of 1 sign C,

go to step 8.

8, Enter the value of Vn, go to step 9.

9. Calculate the number of polls pld1, go to step tO.

10. Interrogate sensor D1 m times, go

to step 11.

11. Calculate the value of hi, go to step 12.

12. Increase by one Cr2 the number of values of hi, go to step 13.

13. Determine the state of the sensor D7, if 1, then go to step 15, otherwise - to step 14.

14. Determine if 1 sign d is equal, if yes, go to step 32, otherwise go to step 4.

15. Determine is equal to 1 sign d, if

Yes, go to step 17, otherwise - to step 16.

16. Assign the value of 1 feature d. Go to step 17.

17. Determine that the counters of the number of pulses from the sensors D2, D4, DB are running, if.

Yes, go to step 19, otherwise go to step 18.

18. Start the counters D2, D4, D6, go to step 19.

19. Determine whether the content of the Cgb mbm counter is equal, and if so, go to step 21,

otherwise, to step 20.

20. Determine whether the content of the SPB is greater than or equal to the MBM / (where I is a number depending on the speed of program execution by the computer complex), if yes, go to step 22. otherwise, go to step 19.

21. Record the contents of the Cr D2, Cr D4 counters, go to step 23.

22. Determine whether D1 is working, if so,

go to step 24, otherwise go to step 32.

23. Restart Cr D2, D4, D6, go to step 25.

24. Determine the content of Cn more content Cg, if yes, go to step 8,

otherwise, to step 2.

25. Increase by one the content of the counter of the number of turns of CrS, go to step 26.

26. Determine the state of sensor D5, if 1, then go to step 28, otherwise - to step 27.

27. Calculate the length of the coil and (expression 14), go to step 29.

28. Calculate the value of the length of coil B (expression 13), go to step 29.

29. Calculate the swing moment of the GDi2 turn, go to step 30.

.thirty. Sum with the previous value obtained in step 29 of GDi2 to transfer the total value of the ground moment to

tension control system, go to step 31,

31. Determine the state of the sensor D7, if 1, then go to step 32, otherwise - to step 20.

32.Reset SM, 2, 3,

The end of the algorithm.

The implementation of the method on both existing and newly created mills does not cause any difficulties, since they use technical means available on all rolling mills to automate technological processes. In particular, the KTS-LIUS-2 aggregate complex that has found wide application in the automated process control system of rolling production is used as a computing device.

The technical and economic effect of the implementation of the invention is provided as compared to the base object by improving the quality of the winding due to more accurate compensation of the dynamic component of the current of the motor winder core and, consequently, increasing the accuracy of maintaining tension and thereby the quality of the finished product.

Claims (1)

Claim Method The method for determining the flywheel moment of a coil strip during winding consists in measuring the current strip thickness, measuring one of the coil parameters, and determining the flywheel moment of each coil roll and determining the flywheel moment of the entire roll according to the calculated dependence, characterized in that increase the accuracy and simplify the implementation of the method as mentioned parameter, measure the length of the coil, and the swing moment of the roll is determined by the dependence of h sy;  (e; h; -) (ef-2th; e; 42 b where G is the total mass of the roll; D is the outer diameter of the roll; i is the sequence number of the coil; n is the number of turns at the moment of determining the rolling moment of the roll; h, is the average thickness of the i-ro turn. g is the acceleration of free fall; y is the density of the strip material; b - the width of the Polo HI unrolled into a roll - the length of the 1st turn of the roll. V t p p p f f t4 g MGR Mfr gtf TR FR SH SH T video clips Forming radeli BoraVan winder I From ACS / Rohot- - G leg of the camp - & Keyboard input Figure 1 C start j nf-i enter memorization S, ft u (in „+ a%},  where ft is the number of St / mk;  llotnos / roll roll about i -eight Input value V -9 - Pawe / nwcjia polls t D1 -10- Poll / prose D1 lhi, ..., fim) -11- Calculation from hi r- / Uve / mission on 1 Crl 7J H / L / t WOI where fyf is the time of one dimension h V- A / 77 Fig.Z Fi & 4 , „, PfrMbN d l, Z # n it P} n Mar 1 PS Is. Ј - G, - / l - ,, / til  y / 7 J Definition and 6atdava Tbs G32Cr1,2J nulling