JPS58128211A - Control device for speed of continuous rolling mill - Google Patents

Abstract

PURPOSE:To improve rolling performance by moving a determining device for group speeds at every gnawing in each rolling mill thereby setting the speed during passing through each rolling mill freely and taking the passing speed on the upper stream sides of continuous stands high. CONSTITUTION:When a material is to be rolled, a determining device 2 for discrete speeds is beforehand so set to make the mass flow between the respective rolling mills constant, but a determining device 1 for group speeds operates the plate speeds on outlet sides from the correction factors from an arithmetic device 3, that is, the rolling reduction distributions of the respective mills at every gnawing in the respective rolling mills. According to the accelerating and decelerating rates of the device 1 operated from the traveling time up to the next rolling mill, the device 1 is corrected at every gnawing in each rolling mill so as to attain the gnawing speed of each mill in each rolling mill.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous rolling mill speed control device for controlling the rolling speed of a continuous rolling mill.

In conventional continuous rolling mills, once the reduction distribution of each rolling mill is determined, the rotational speed of the rolling rolls of each rolling mill is determined so that the mass flow between the rolling mills is constant. Then, rolling was controlled so that rolling was started after the speed setting was completed so that the mass flow of each rolling mill was constant. FIG. 1 is a schematic diagram of a conventional control device of this type. 2) is a rolling mill individual speed determining device (hereinafter referred to as side speed determining device) that determines a predetermined speed for each rolling mill.

When rolling the material, each individual speed determining device is set such that the mass flow of each rolling mill is constant. In other words, the plate thickness at the exit side of each rolling mill is Hl, and the material speed at the exit side of each rolling mill is V.
If i (i=1.2......), the following (
1) The formula holds true.

Hl・V, = H2・Vt−H5・v, =・・・・・・
・=Hn#■o... [1] The peripheral speed Ni of the rolling roll is given by the advance rate as fi. [2] Formula % formula % fi is the amount that is determined once the reduction amount is determined. Determined for each machine. However, there are certain conditions in which the speed of the material during threading must be set to an appropriate speed to allow the material to be bitten by the rolling mill. For this reason, if the speed of a certain rolling mill is determined to satisfy the biting condition, the speed of all the rolling mills will be determined, and if the speed of the rolling mill near the final stand is set to a speed that allows the strip to pass through, then the speed of the rolling mill on the upstream side will be determined. This method had the disadvantage that the threading speed was kept low.

The present invention has been made to eliminate the drawbacks of the conventional methods described above, and an object of the present invention is to provide a continuous rolling speed control system that allows the strip passing speed to be set freely and that satisfies the biting speed conditions.

An embodiment of the invention shown in FIG. 2 will be described below. Fig. 2 (a) is a block diagram showing a continuous rolling speed control device, and Fig. 2 (b) is a diagram showing an example of its operation. (3) is the correction speed of the group speed determining device (1) in order to match the group speed determining device (1) to the biting speed of each mill during sheet threading;
It is a calculation device that calculates the amount of correction.

Next, the operation will be explained. When rolling material, the individual speed determining device (2) is set so that the mass flow between each rolling mill is constant, but the group speed determining device (1) calculates each rolling mill each time. Correction rate from device (3),
That is, the group speed determination device (1) calculates the outlet plate speed from the rolling distribution of each mill, and calculates it from the running time at the next rolling mill.
According to the acceleration/deceleration rate, the group speed determining device (1) is corrected each time it engages each rolling mill so that the velocity of each mill in each rolling mill becomes the same. The exit speed when the i-th stand is engaged is Vi, the i-th +
1 The exit speed of the i-th stand immediately before the stand engages is Vi
' + Vt + If the time for one stand engagement is ti, then ΔVi = Vi' - Vi ti=□ Vj ++ ΔVi.

As described above, according to the present invention, since the group speed determining device is moved every time each rolling mill is engaged, the speed at which the strip is passed through each rolling mill can be freely set, and this makes it possible to It is possible to increase the sheet threading speed on the upstream side, which has the effect of improving rolling efficiency.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram showing a conventional continuous rolling mill speed control device;
FIG. 2 shows an embodiment of the present invention, in which FIG. 2(a) is a configuration diagram thereof, and FIG. 2(b) is a diagram showing an example of its operation pattern. In the figure, (1) is a group velocity determining device, (2) is an individual velocity determining device, and (3) is an arithmetic device. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Shin Kuzuno - Figure 1

Claims (1)

[Claims] The speed of each rolling mill is controlled through cooperation between a rolling mill group speed determining device that determines the basic speed of the entire rolling mill group and a rolling mill individual speed determining device that determines the speed of each rolling mill corresponding to the basic speed. A calculation device is provided which calculates the outlet side plate speed from the rolling reduction distribution of each rolling mill and calculates the acceleration/deceleration rate from the running time to the next rolling mill, and controls the rolling mill group speed determination device using this acceleration/deceleration rate. A continuous rolling mill speed control device characterized by controlling a basic speed.