JPH0422505A - Automatic thickness controller for shapes - Google Patents

Abstract

PURPOSE:To obtain constant thickness dimension in spite of the temp. drop of steel material by changing rolling reduction in traveling of steel material in accordance with the thickness variation of web and flange. CONSTITUTION:At the same time of the start of rolling, the temp. of steel material is measured with thermometers 23 for web and thermometers 24 for flange which are provided near by a mill and inputted in a thickness pattern input unit 21. Thickness data SF, SW are determined from the measured value of temp. based on thickness pattern with the thickness pattern input unit 21 and inputted in an arithmetic unit 22 for thickness correction. Further, thickness deviations FWi, FFi are calculated from initial roll gaps SWio, SFio, added to the set values SWio, SFio of the initial roll gap through rates 25 and flying thickness control is executed based on them.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention is a universal rolling mill that rolls steel shapes such as H-shaped, ■-shaped, and channel steel, and adjusts the roll gap amount during rolling. The present invention relates to an automatic plate thickness control device for shaped steel that takes into account the temperature drop of rolled material due to thermal down, which controls the thickness of shaped steel.

(Prior art) A universal rolling mill for rolling shaped steel includes a rough rolling mill, intermediate rolling mill, and
It is continuously rolled in a finishing mill to produce a shaped steel with predetermined dimensions.

In this case, the length of the steel material rolled by the finishing mill is 100
Temperature drop of several tens of degrees Celsius (thermal rundown) occurs at the tip and rear ends due to rolling time.
will occur.

Due to this temperature drop, the deformation resistance of the steel material increases toward the rear end even within the same bar, and the finished thickness of the product increases from the front end to the rear end, resulting in a problem that the dimensions are not the same.

FIGS. 4(a) and 4(b) show the relationship between steel material temperature, web thickness, and flange thickness.

(Problems to be Solved by the Invention) Conventionally, the plate thickness has not been controlled to vary due to the temperature drop, and the plate thickness has been determined only by the initial preset gap amount. Therefore, due to changes in the deformation resistance of the steel material, the product dimensions differ between the tip and tail ends of the same bar.

In recent years, demands for improving the yield of shaped steel have become stricter, and it has become necessary to control the web thickness and flange thickness from the leading edge to the trailing edge of shaped steel products to eliminate fluctuations and maintain a uniform plate thickness.

The present invention has been made in consideration of the above problem, and by changing the reduction amount during steel material running in response to changes in the thickness of the web and flange, a constant plate thickness can be maintained regardless of the temperature drop of the steel material. The purpose of the present invention is to provide an automatic plate thickness control device for shaped steel.

[Structure of the invention]

(Means and effects for solving the problems) In order to achieve the above object, the present invention provides a schedule setting device that sets the initial gap amount between the horizontal roll and the rigid roll based on the rolling schedule, and a schedule setting device that sets the initial gap amount between the horizontal roll and the rigid roll based on the rolling schedule, and A thickness pattern input device that stores the thickness pattern in memory, a thermometer that measures the temperature of the web and the flange, a calculator that calculates the thickness deviation from the initial roll gap and the thickness pattern, and a universal rolling process based on this thickness deviation. An automatic plate thickness control system for shaped steel includes a rolling down control system that drives the horizontal roll and hard roll rolling down devices of the machine to control the amount of gap between the horizontal roll and hard roll. regardless of temperature changes.

This ensures that the same product dimensions are obtained over the entire length of the rolled material.

(Example) An embodiment of the present invention is shown in FIG.

First, before the start of rolling, the schedule setting device 20 sets the initial roll gap amounts of the web and the flange to Svi.
. rSFi. Set to . The lowercase i in the symbol represents the number of passes.

Based on this setting value, the roll gaps of the web and the flange are set by the horizontal roll reduction control system 12 and the rigid roll reduction control system 13, respectively, and this setting value is stored in the thickness correction amount calculating device 22.

On the other hand, a correlation pattern of web thickness and flange thickness corresponding to the steel material temperature is stored in the thickness pattern input device 21.

Simultaneously with the start of rolling, the temperature of the steel material is measured using a web thermometer 23 and a flange thermometer 24 installed in the immediate vicinity of the mill, and input into the thickness pattern input device 21 .

The thickness pattern input device 21 calculates thickness data SF*SW based on the thickness pattern from the temperature measurement value, inputs it to the thickness correction amount calculation device 22, and further calculates the initial roll gap amount SVi. tsFL. and plate thickness deviation ΔFVitΔF
Calculate Fi and set the initial roll gap setting value 5Vio*SFi via rate 25. The plate thickness during running is controlled based on this value.

In this case, the following calculation is performed within the thickness correction amount calculation device 22.

That is, the thickness deviation data ΔFwitΔF+rt is calculated by the following formula from the initial roll gap 5Viots, rLo and the thickness data SV+SF obtained from the thickness pattern.

ΔFvt=kv(Swto Sv) −■Δ
FFyo = kr (Sirto SF)...
・■Here kV+kF are the coefficients for the web and flange, respectively.

Further, as the 5WtSF, data sampled at each scan time of the controller is used.

Another embodiment of the invention is shown in FIG.

Fig. 2 shows a web thickness gage 27 and a flange thickness gage 28 installed in the vicinity of the mill in place of the thermometers 23 and 24 in Fig. 1. Interval thickness control is performed.

Further, FIG. 3 shows still another embodiment of the present invention,
In this case, a correlation pattern between the length of the steel material and plate thickness data is input into the thickness pattern input device f21, and the total length of the steel material is trunked by the tracking device 29 using pulse signals from the pulse transmitter 31 of the mill and table. Thickness pattern input device that inputs plate thickness data when the tracking part arrives just before the mill after rolling starts! 21 and inputting this data to the thickness correction amount calculating device 22, automatic plate thickness control is performed by feedforward control.

〔Effect of the invention〕

As explained above, according to the present invention, by dynamically feeding back thermal random factors, which have not been considered in the past, to the reduction control system, it is possible to improve product dimensional accuracy within the same bar and improve yield. I can do it.

[Brief explanation of the drawing]

1 to 3 are configuration diagrams showing each embodiment of the present invention, and FIG. 4 is a characteristic diagram showing the relationship between steel material temperature and plate thickness. 1...Horizontal roll 2...Hard roll 3.
...Shape steel 10...Horizontal roll reduction motor 11...Hard roll reduction motor 12...Horizontal roll reduction control system 13...Hard roll reduction control system
20... Schedule setting device 21... Thickness pattern input device 22... Thickness correction amount calculation device 23... Web thermometer 25... Setting rate 27... Web thickness meter 29... Tracking device 31... Pulse transmitter 33... Tracking part 24... Flange thermometer 26... Adder 28... Flange thickness gauge 30... Table roller 32... Hot mass detector

Claims (1)

[Claims] In automatic plate thickness control equipment for shaped steel, which is equipped with a horizontal roll reduction control system that adjusts the web gap amount and a rigid roll reduction control system that adjusts the flange gap amount, the initial gap between the horizontal roll and the rigid roll is determined based on the rolling schedule. a schedule setting device for setting the amount, a thickness pattern input device that stores the temperature and thickness change patterns of the web and flange, thermometers that measure the temperatures of the web and the flange, and the initial gap amount and thickness pattern. 1. An automatic plate thickness control device for shaped steel, comprising a thickness correction amount calculation device for calculating a thickness correction amount from the horizontal roll reduction control system and the rigid roll reduction control system.