JPS598157B2 - Speed control device for multi-stand continuous processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speed control device for a multi-stand continuous processing device, and particularly to a speed control device for a continuous processing device such as a rolling mill.

FIG. 1 shows the general configuration of a rolling mill with n studs.

In this figure, the workpiece 1 is gradually rolled while being fed between n stands A_i-A_n including the reference stand A_l.

Each of these stands Λl-A_n is equipped with a motor Bl-B.
motors Bl-Bn are connected to each other, and control devices Cl-cn are respectively installed in these motors Bl-Bn. Control device C1~
Speed commands Dl-Dn are applied to Cn, respectively. Assume that the speed of each stand is set as follows.

Speed of stand Λl = 51 Speed of stand A_2 252 Speed of stand A_n = 5n In other words, the speed command for each stand is Dl■s1
, , D2=52, . . . , Dn:Sn.

In such a state, when trying to adjust the thickness of the workpiece 1 on the exit side of the rolling mill, the speed ratio between each stand must be changed at a constant rate. If this ratio is O(l+α) (where α is a speed ratio constant to scund A_l and is also called the stretch amount), then the corrected speed of each stand must be as follows. Speed of stand A_2 S2(1+α) Speed of stand A3=S3(1+α)2 Speed of stand An=Sn(1+α)n-1 That is,
The speed commands D1 to Dn are D1=Sl. D2=S2(1+α
), ......Dn2Sn(1+α)n-1.

By the way, in the past, since the above calculation was extremely difficult, approximate speeds were used as follows.

Speed of stand A1 = S1 Speed of stand A2 S2 (1
+α) Speed S3 of stand A3 (1+2α) Speed of stand An {1+(n-1)α} Of course, even in the case of such approximate calculation, α is small and 0.95 minus (1+α)n- If it is about 1〈1.05,
Although not much of a problem occurs, α increases from 069 to 0.
7ku(1+α)n-1ku1. When it becomes about 1-13, the error becomes large and causes inconvenience to the operation.

However, as a method of adjusting the thickness (or length) of the workpiece 1 on the exit side of the rolling mill, the so-called stretch vernier control, which changes the speed ratio between each stand at a constant rate, is used as described above. Since it is the simplest and most effective method, there has been an increasing need for stretch vernier control with higher precision than conventional methods. SUMMARY OF THE INVENTION In view of the above-mentioned points, it is an object of the present invention to provide a speed control device for a multi-stand continuous processing device that can perform highly accurate stretch vernier control with a relatively simple configuration using a multiplier.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, a stretch amount setter 2 generates a stretch amount α and adds it to an adder 3 together with a reference value (=l).

The adder 3 receives these inputs and outputs the sum thereof, that is, the speed ratio (1+α). This output is multiplier F
22,F3l,F4l,...F(.-1)1,Fn1
added to. On the other hand, the multiplier F22 contains the speed setting value S
2 has been added, F22 is their product S2(1
+α) is applied to the control device C2 as a speed command D2. Multiplier F3l converts the product (1+α)2 of human power values into F32 and F4
F4l receives it and adds (1+α)3 to F42
and output to F5l. In this way, by sequentially using the output of the previous multiplier, (1+α)2 becomes (
1+α) generates values up to n-1. Therefore, the multiplier F(
. The output of 1,)1 becomes (1+α)n-2, which is 5F(.-
1) added to 2 and Fnl, the output of Fnl is (1+α
)n-1. Multipliers F32 to Fn2 multiply the speed setting values S3 to Sn and (1+α)2 to (1+α)n-1, respectively, to obtain the products S3(1+α)2 and S4(1-+
-a) 3,..., Sn-1(1+α)n-2,
Sn(1+α)n-1 is applied as speed commands D3 to Dn to control devices C3 to Cn, respectively. Note that the speed command D1=S1 is added to C1 as before. With this configuration, the output of the multiplier can be used to calculate the speed command of the stand in front, so the number of multipliers is small, and theoretically it is possible to perform stretch vernier control with zero error. Become.

FIG. 3 shows how the rolling speed is changed in the embodiment shown in FIG. Up to now, the case has been described in which only one setting for the stretch amount α is provided for all stands, but in order to achieve more accurate control, the stretch amount may be set in multiple stages. This is required when trying to give a large amount of stretch to the middle stand and a relatively small amount of stretch to the rear stand. FIG. 4 shows an embodiment in which the stretching amount is set in two stages. In this figure, a stretch amount setter 2A, an adder 3A, a multiplier G22, G3l, G3
2, . . . , Gil, Gi2, which performs stretch vernier control for the stretch amount α1, has exactly the same structure as that shown in FIG. Also, stretch amount setting device 2B,
Adder 3B, multiplier G(1+1),, G(1+i)2p
G(1+2)1pG(1+2),,゜゜゜・G(n-1
)1G(n-1)2, , Gn1, Gn2, the structure of the stretch amount α2 is almost the same. However, multiplier G(1+1)1 is the output of adder 3B (1+α2)
And receiving Gil's output (1+α1)i-1, (1
The only difference is that +α1)i-1X(1+α2) is output as G(1+1)2. As a result, speed command D1=S1,
D22S2(1+α1), D32D3(1+α1)2c
..., Di=Si(1+α1)i-1, Di+, -Si
+1×(1+α1)i−1X(1+α2), Di+2−
Si+2(1+α1)i−1×(1+α2)2,...
Dn- to Sn-1×(1+α1)i-1×(1+α2)
n-1-1, Dn2SnX (1+α1)i-1×(1+
α2) n-1 As stated above, according to this invention,
With a simple configuration, the speed of each stand can be changed with high accuracy regardless of the size of the speed ratio.

Further, while the output of the multiplier is output as a speed command, a part of the output is added to the multiplier at the next stage, so complex calculations can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing a one-stage configuration of a multi-stand continuous processing device, FIG. 2 is a block diagram showing an embodiment of a speed control device in a multi-stand continuous processing device according to the present invention, and FIG.
The figure is an explanatory diagram of its operation, and FIG. 4 is a block diagram showing another embodiment. 2, 2A, 2B...Stretch amount setting device, 3,
3A'3B゜゜゜゛゜゜Adder, F229F3l9F3
2゛゜゜Fn1FFn2) and G22FG3lpG32
RA゛゜゜FGnLeGn2・・・・・・Multiplier.

Claims (1)

[Claims] 1 Reference stand A_ of n stands A_1 to A_n
A stretch amount setter that sets the stretch amount (α) for 1, an adder that adds the stretch amount of this stretch amount setter to a reference value (1) to generate a speed ratio value (1+α), and stands A_3~ (n-2) multipliers F_3_1 to F_n_ provided corresponding to A_n, respectively;
1, and among these, the multiplier F_3_1 takes the speed ratio value (1+α) as one input and the other input and multiplies each other, and the multipliers F_4_1 to F_n_1 take the speed ratio value (1+α) as one input, and Multipliers F_3_1 to F(_
n_-_1) A first arithmetic unit that multiplies the output of _1 as the other input, and (n-1) multipliers F_2_2 to F provided corresponding to stands A_2 to A_n, respectively.
Among them, multiplier F_2_2 takes the speed ratio value (1+α) as one input, and multiplies the speed setting value (S_2) of stand A_2 as the other input, and multipliers F_3_2 to F_n_2 1st
Multiplier F_3_1~ corresponding to each stand of the arithmetic unit
A second arithmetic unit that takes the output of F_n_2 as one input and multiplies the speed setting values (S_3) to (S_n) of the corresponding stands as the other input, and calculates the speed setting value (S_1 ) is the speed command value (D_1) of this stand, and the outputs of the multipliers F_2_2 to F_n_2 of the second arithmetic unit are respectively the speed command values (D_2) to (D_n) of the stands A_2 to A_n. A speed control device in a multi-stand continuous processing device, characterized by controlling A_1 to A_n.