JPS6264415A - Method for measuring deformation resistance of rolling plate - Google Patents

Abstract

PURPOSE:To easily and accurately measure the deformation resistance of a rolling plate under an on-line condition, by detecting the rolling load, rear-side tension, etc., of the rolling plate when different-speed rolling is performed to the plate by passing the plate between a low-speed side work roll and high-speed side work roll and winding the plate around the work rolls. CONSTITUTION:At the time of rolling the in-side thickness h0, out-side thickness h1, rear-side tension tb, and rolling load P are respectively detected by means of a thickness detector 6, thickness detector 7, tension detector 5, and load detector 4. Signals of these detectors are sent to a computing element 8 and the deformation resistance K of a rolling plate S is operated from Formulae I-III regardless of the coefficient of friction. Then the resistance K is supplied to an arithmetic control unit and the quantity of roll gap at the downstream side rolling mill caused by the resistance K is operated. The roll gap is adjusted in accordance with the operated results. When this measuring method is applied, the deformation resistance of a rolling plate can easily and accurately be measured without relying upon the experience and feeling of a worker and, therefore, adjustment of the roll gap between work rolls in the later stage can accurately be performed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention involves rolling a plate at different speeds by passing a plate between a low-speed work roll and a high-speed work roll and wrapping the plate around the high-speed work roll. The present invention relates to a method for online measuring the deformation resistance of a rolled plate.

[Prior Art 1] Even when coils made of the same material are rolled, the hardness varies depending on the coil, so the deformation resistance of the rolled plate also varies. Therefore, when setting the roll gap of the 111 machine work roll, regardless of uniform speed rolling or variable speed rolling, it is necessary to consider the deformation resistance of the rolled plate. Then,
Previously, there was no way to measure deformation resistance online, so work roll gaps were set by relying on experience and intuition during the work day.

However, operations that rely on the experience and intuition of workers have limitations in terms of labor savings on the rolling line and in the accuracy of plate thickness for rolled products. On the other hand, in recent years, it has been clarified that the following relationship holds true in the case of ordinary constant speed rolling, and since the following relationship has been known for a long time, (i) (i'i)
It has come to be considered that the deformation resistance K of the rolled plate can be obtained online from the equation (i'u).

However, P ; Rolling load t□; Front tension of the rolled plate tb; Rear tension of the rolled plate Ah; Rolling fabric (ho h+) R゛ ; Flat roll radius during rolling R; Roll radius B ; Plate width (μ) ;ll! Rolling force function C considering coefficient coefficient: Constant E; Young's modulus ν; Poisson's ratio [Problem to be solved by the invention] However, in the equation (1) of It is necessary to find the friction coefficient μ, but it is possible to use an empirical value for the friction coefficient μ, or even if it is determined from experiments, there are various formulas for the rolling force function f(μ), and the results will vary depending on which formula is selected. As a result, even if the deformation resistance K of the rolled plate is determined from the equation (1), it may not be possible to obtain an accurate value, resulting in a lack of reliability.

In view of the above-mentioned circumstances, the present invention improves the deformation resistance of the rolled plate when the rolled plate is threaded between a low-speed work roll and a high-speed work roll and rolled at different speeds by being wound around the high-speed work roll. The purpose is to measure online.

[Means for Solving the Problems] In the present invention, a rolling plate is passed between a work roll on the 1 Fahrenheit speed side and a work roll on the high speed side, and is wound around the work roll on the high speed side to perform rolling at different speeds. In this method, the rolling load of the rolled plate, the rear tension of the rolled plate, and at least the exit side thickness of the rolled plate are detected, and the deformation resistance of the rolled plate is calculated online from these detected values, regardless of the friction coefficient between the rolled plate and the work roll. I'm looking for it.

[Function] The rolled plate is passed between the low-speed work roll and the high-speed work roll, and is wound around the high-speed work roll to perform rolling, and the detected rolling VJ weight, rear tension of the rolled plate,
The deformation resistance of the rolled plate can be determined online without determining the friction coefficient between the rolled plate and the work roll based on the set or detected thickness of the plate and the exit side.

[Example] Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

First, the principle of the present invention will be explained with reference to FIG. 2. When a rolled plate S is passed through a low-speed work roll 1 and a high-speed side 1 no-crawl roll 2, and is rolled around a high-speed work roll for different speed rolling. ,V]/VO=ho/h+, then it holds true and can be found from the equation 00. However, when rolling at different speeds is performed in the state shown in FIG. 2, the forward tension tf cannot be detected, so the deformation resistance K cannot be determined from equation (V).

On the other hand, when rolling at different speeds with the high-speed side wrapped, this is true because the high-speed side neutral fish coincides with the gap exit, so lyD
From the formula. Therefore, by substituting equation (A) into equation (V) and sorting it out, the following holds true. From equation (), it is possible to measure the deformation resistance K of the rolled plate S online without finding the friction coefficient μ. . Note that 3 in Figure 2 is a deflector roll.

Next, a specific example of the present invention will be explained with reference to FIG. 1. In the figure, 4 is a vJ hand detector such as a load cell, 5 is a tension detector for the rear tension tb of the rolling mill S, and 6 is a plate thickness detector on the entry side. 7 is a plate thickness detector on the exit side, a load detector 4, a tension detector 5,
The signal detected by the plate thickness detector 6□7 is sent to the calculator 8 1q
It has become so. Further, the calculation unit 8 can be set with the plate width B1 of the rolled plate S, the radius of the work rolls 1 and 2, (ii) (g) θ, etc.

During rolling, the plate thickness detector 6 detects the inlet plate thickness ho, the plate thickness detector 7 detects the outlet plate thickness h1, the tension detector 5 detects the rear tension ↑b, and the load detector 4 detects the rolling cart P. , the signal is sent to the calculator 8, and the deformation resistance of the rolled plate S is determined by (ii) CrD regardless of the friction coefficient.
(a) Calculated by formula. The deformation resistance calculated in this way is sent to the arithmetic and control unit, and a roll gap correction amount due to the deformation resistance K provided in the downstream rolling mill is calculated, and the roll gap is adjusted based on the calculation result. When determining such deformation resistance K, use the neutral point N+ in Fig. 1,
Even if N2 slightly deviates from the ideal state, it will not cause any problem.

In addition, in the embodiment of the present invention, the case where the entry side plate thickness is measured has been described, but it is possible to obtain the deformation resistance even if it is given as a set value in advance, and other changes may be made within the scope of the gist of the present invention. Of course, various changes may be made to λ1.

[Effects of the Invention] According to the method for measuring rolling mill deformation resistance h1 of the present invention, it becomes possible to easily and accurately adjust the deformation resistance of a rolling mill online without relying on work experience or intuition. The work roll gap of the subsequent rolling mill can be adjusted accurately, and as a result, it is possible to save labor on the rolling line and improve plate thickness accuracy.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of one embodiment of the present invention, and FIG. 2 is a detailed explanatory diagram of the present invention. In the figure, 1 is a low-speed work roll, 2 is a high-speed work roll, 3 is a deflector roll, 4 is a load detector, 6 and 7 are plate thickness detectors, and 8 is a pupillator.

Claims (1)

[Claims] 1) In a rolling method in which a rolled plate is passed between a low-speed work roll and a high-speed work roll and is wound around the high-speed work roll to perform different speed rolling, the rolling load of the rolled plate and the rear tension of the rolled plate are A method for measuring deformation resistance of a rolled plate, comprising detecting at least the exit side thickness of the rolled plate, and determining the deformation resistance of the rolled plate online from these detected values, regardless of the friction coefficient between the rolled plate and the work roll.