SU1680398A1 - Method of determining rolling stand rigidity value - Google Patents

Description

The invention relates to rolling production and can be used to assess the characteristics of the mill stand as a control object. The purpose of the invention. - expansion of functionality by simultaneously determining the modulus of stiffness of the rolls for bending.

The invention relates to rolling production and can be used to assess the characteristics of the mill stand as a control object.

The purpose of the invention is the extension of functionality by simultaneously determining the modulus of stiffness of the rolls for bending.

FIG. 1 shows a functional diagram of the device that implements the method; in fig. 2- uncorrected output characteristic of one of the two conversion channels of the force measurement device (MCD) of rolling, the sensors of which are built in stand (a), and the same characteristic, but corrected (6).

The functional diagram that implements the method consists of a cage 1 with the top 2 and

2

A silo load is installed in the gap between the rollers, a cage is loaded with exemplary force and the force is measured at the rolling force sensor installation sites; it to zero, repeat this cycle of loading and unloading at least two times with simultaneous measurement of the roll gap in the center and along the edges of the roll barrel, as well as the forces in the field SETTING sensors at each loading stage averaged measured force and the roll gap at the center and at the edges of the barrel and the average gap between the rolls, as well as depending modules cage and roller system of the exemplary power corrected measured average force and stack them. 2 Il.

the lower 2 work rolls, the rolling force measurement unit 4, comprising left 5 and right 6 force sensors and a measuring cabinet 7, a hydraulic force-generating unit 8 containing two extreme 9 and 10 and one 11 central hydraulic jacks and three displacement sensors installed on them 12-14 and a pressure sensor 15, as well as a setting unit 16, consisting of an output signal processing unit 17, calculating correction factors for setting the output signal regulation unit 18, a key 19 of the summation unit 20, an average calculation unit 21 The values of the roll gap in the center and along the edges of the roll body, the unit 22 for calculating the average gap between the rolls, the unit 23 for calculating the difference deflection rollers

511 ,,,, 1680398 A1

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in the center of the barrel and along its edges, the units for calculating the module of the stand 24 and the module of the roller system 25, as well as blocks 26 and 27 of permanent storage devices.

The device works as follows.

The key 19 is opened. Three hydraulic jacks 9-11 with displacement sensors 12-14 and pressure sensor 15 are inserted into the gap between rollers 2 and 3. Using a pumping unit, a pressure is created in the cavities of the hydraulic jacks, which provides the force of thrust of the rolls 2 and 3, which is sufficient for taking backlashes in the cage 1 elements. .

Then, using hydraulic jacks and a pump unit, they increase the force of the spreading of the rolls to a value equal to the nominal rolling force R _P ph, and then unload to 0. Repeat this loading-unloading cycle at least two times. At each step of loading, the exemplary force of the spreading of rolls Tpr! Is fixed, the output signals of the left one) ^P L | and ^R s and legal unit 4 measurement channels rolling force (block 17) proportional to the forces acting on the left and right 5 6 sensors mounted in the stand 1, the outputs of displacement sensors ⁸ and q | , υ% ί, υ ⁵ κί, proportional to the inter-roll gaps in the center 5 _C 1 and along the edges of the rolls barrel 5l!, 5πί (block 21). Wherein

g „p ,, (,)

where η is the number of loading steps in the range of variation of the rolling force, ί is the sequence number of the step.

For each ϊth loading stage, the output signals of the left and right conversion channels of the rolling force measurement device 4 are averaged (block 17)

Σ.il.пи

and ^p p. '(Ρπρί), (2)

and signals of displacement sensors (block 21)

2k

\ 5l, c, l, 1.)

Il.ts.p.1 == ^ - 2 ~ £ -. (3)

where | - the sequence number of the cycle of loading-unloading, ·

K is the number of cycles.

For each 1st loading step, the average roll solution is determined (block 22)

O.__ ... 8_ + + υ ^ ι + nd ’

οι = t ₈ υι · = -—- te, (4)

where t ₅ is the scale factor and the difference in deflections (block 23)

Δ5ι = t ₈ ΔΙΙι ⁵ = (ΐΛ, π.ι - U ⁵ ) te, (5.) the stand module (block 24)

Μl1 = - ^ 1. (6)

module of the roll system (block 25)

st

The calculated values of M _K l and M are _entered into the ROM (blocks 26 and 27).

The output correction factors are calculated for the averaged output characteristics of the left and right conversion channels of the rolling force measurement device (block 17), and the design formulas depend on the chosen linearization method and the normalization of these characteristics.

If, for example, a piecewise linear approximation is chosen that is realized, say, with the help of a commercially available block of nonlinear transformations (BN) (3.670.51 EG), then to set it up, you need to do the following.

Received average output characteristic (2)

b) l, n, 1 - I (EPRO

conditionally divided into η zones (Fig. 2).

At the choice of the sizes of zones observe a condition

s in> and ^p l, n, p + 1 - and ^p lp, P - o, 2 in (8)

Here, 13 l, n, p + 1, and l, l, p is the output value of the left or right conversion channel of the rolling force measurement device by the averaged output characteristic (2) for (p + 1) and p-th zones, respectively;

p is the sequence number of the zone.

For each zone, calculate the gain

where and ^p P + 1, n; and ^p P, n - the normalized value of the output signal of the device for (p + 1) and p-th zones, respectively.

The obtained coefficients are used to configure the block 18 of the normalization of the output signals of the left and right channels of the force measurement device. Having added the normalized signals of the left and right conversion channels of block 4, they receive a signal proportional to the rolling force (block 20). The output signal of block 20 can be used in the rolling process (with the key 19 closed) to extract from the ROM

five

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6

(blocks 26 and 27) data on the modules of the stand and the roller system corresponding to the current value of the rolling force.

Thus, as a result of the implementation of the method for assessing the state of the parameters of the stand at the output of the equipment implementing the method, reliable information is obtained about the force and deformation parameters of the stand. This, firstly, makes it easier to set up the cage by eliminating the tuning lanes and reduce the time for it, secondly, correct assessment of the state of the cage allows you to competently operate the cage and its equipment, avoiding overloads, 15 that lead to breakdowns and mill stops, which in turn causes an increase in the reliability of its work and, thirdly, reliable information on the power and deformation parameters of the stand can be used by the operator during manual control or in the process control system to improve the accuracy of and,

Claims (2)

Claim 1. The method of determining the rigidity of the rolling stand, providing for the application of the thrust of the rolls, the measurement of the roll gap corresponding to this force and the calculation of the module of the rigidity of the stand, characterized in that, in order to extend the functionality by simultaneously determining 10 modulus of stiffness of the rolls for bending, the force bursting the rolls is applied in the rolls gap at at least three points high in the roll barrels, the roll roll gap is measured at the points of application of the specified force, and the flexural stiffness modulus is calculated. 2. The method according to p. 1, characterized in that the force bursting the rolls, first increase to the nominal value of the rolling force, and then reduce it to zero, repeating this cycle at least two times. "ΒιΙ.ί 1680398 FIG. 2