Boots – shoes – and leggings
Patent
1982-06-21
1985-11-05
Ruggiero, Joseph
Boots, shoes, and leggings
72 11, 364472, G06F 1546, B21B 3700
Patent
active
045518050
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a control system for configuration of strip material obtained by a rolling.
BACKGROUND ART
In the conventional strip configuration control, there are many cases where there is no concrete indication of correspondency between configuration signals from a configuration detector and an operational variable of an operational actuator (e.g. bending force, rolling operation etc.) for the configuration control or where the processing of them to obtain the correspondency is insufficient. The detector is usually constructed such that the width of the material is divided into segments and the elongation rate (or stress value) of the material in the transverse direction is detected by the detector for each of the segments. Thus, the detector provides output signals for the respective segments. The number of these output signals from the configuration detector is usually several multiples of tens. However, the number of operation points of the configuration control actuator is considerably less. Therefore, in the conventional control system, output signals corresponding to the opposite ends segments and only a portion of intermediate segments are usually used causing the configuration pattern recognition itself to be doubtful. For these reasons, it is impossible for the control system to obtain exact and proper control amounts.
In another example of the conventional control system, wherein the configuration signal from the configuration detector is considered as a function of width and the function is approximated by a suitable function such as a multi-term quadratic equation, it occurs frequently that the approximated function does not always clearly correspond to the respective actuator operation amount. Further, since, in the latter case, it is impossible to clearly recognize the local configuration defect, there has thus been obtained no effective control on such local configuration defects.
SUMMARY OF THE INVENTION
This invention intends to obtain the control amounts of approximating the elongation rate signals from the configuration detector obtained for the respective transverse segments of the strip material by a high power polynomial, expanding the high power polynomial to a series of orthogonal functions and utilizing the relation of coefficients of the respective orthogonal functions to operation amounts of the actuator to be used for the control, which exhibits a correspondence sufficient to perform a desired control.
According to this invention, since the recognition of configuration defect pattern is facilitated and the correspondence between the control actuators and the configuration defect pattern becomes clear, the control becomes both simple and effective and the local configuration defects can be clearly separated, resulting in a remarkable increase in the configuration control of strip material.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an example of the configuration signal (elongation rate), which is normalized with the width of strip;
FIG. 2 illustrates the fact that an actual signal from the detector is composed of discrete signals separately obtained along the widthwise direction;
FIG. 3 illustrates the normalized orthogonal biquadratic functions;
FIG. 4 shows an example of actually measured configuration defects and an orthogonal expansion thereof;
FIG. 5 is a plot of coefficient values C.sub.1 -C.sub.4 of orthogonal functions obtained by expanding the actually measured data in FIG. 4, with a variation of a bending amount;
FIGS. 6 to 8 show embodiments of the local defects detection system according to the present invention, in which FIG. 6 is a plot of the actually measured data and the orthogonal function expansion valves;
FIG. 7 is a plot of errors between the measured data and the expansion values and FIG. 8 illustrates an example of a local defect calculated according to the present invention; and
FIG. 9 is a block diagram showing one embodiment of this invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
It is assumed that
REFERENCES:
patent: 4248072 (1981-02-01), Hasegawa et al.
patent: 4269051 (1981-05-01), Clarke et al.
patent: 4380916 (1983-04-01), Tanaka
Iron and Steel, vol. 51, No. 9, Sep. 1977, S. Wilmotte et al.: New Approach to Computer Setup of the Hot Strip Mill, pp. 70-76, * p. 70, col. 2--p. 71, col. 1.
Shimoda Michio
Watanabe Fumio
Mitsubishi Denki & Kabushiki Kaisha
Ruggiero Joseph
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