KR850000008A - Low tension control system of tandem beam rolling mill - Google Patents

Abstract

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Description

Low tension control system of tandem beam rolling mill

Since this is an open matter, no full text was included.

1 is a schematic diagram of a rolling mill including two reverse mills which alternately operate as inlet or outlet stands on two opposite sides of the edge stand, FIG. 2 is a schematic diagram of a motor drive system of one reverse mill, and FIG. 3 is a motor drive system of an edge stand. Schematic.

Claims (5)

A beam passing in opposite directions between the stands which are alternately operated as inlet and outlet stands, with an edge stand with a motor controller, is suitable for rolling with a minimum of tension between the stands and each stand being a motor and 1. A rolling mill having motor driving means including a motor controller, comprising: an inlet stand side first signal generating means responsive to a speed and magnetic flux of an associated motor for generating a signal proportional to a motor driving loss of an inlet stand; An inlet stand side second signal generating means responsive to the speed and magnetic flux of the associated motor to generate a second signal proportional to the inlet stand motor torque; Third means associated with the inlet stand for generating a signal proportional to the inlet stand rolling force; Fourth means for responding to beam entry into the inlet stand for storing an initial rolling force of the inlet stand and an initial value of the initial torque of the inlet stand motor and the motor manual loss; Fifth means for reducing the stored initial torque value by the stored initial loss value to derive an initial effective torque value; Sixth means operative when the end of the beam reaches the outlet stand to determine a change in inlet stand rolling force from said initial value; A seventh device for generating a torque correction signal in accordance with the effective torque value, the rolling force change and the inlet stand losses; And an inlet stand motor controller responsive to the torque correction signal to minimize tension between the inlet and outlet stands. The method of claim 1, wherein said first signal generating means is ^{_{K 1 NØ 1 · 6 + K}} 2 N 2 Ø 2 + K 3 + K 4 N + K 5 N 2 is a first function generator (where K ₁ represents the function Hysteresis loss of the inlet stand motor, K ₂ represents its vortex loss, K ₃ and K ₄ represent its friction loss, K ₅ represents the wind loss, Ø is the magnetic flux and N is the speed of the inlet stand motor. And); [K ₆ + K ₇ N + K ₈ N ² ] f (lt) + K ₉ A second function generator representing the RF function, where K ₆ , K7 and K ₈ represent the lubrication (slip) loss of the inlet stand motor, f (lt) is a function of lubrication temperature lt, K ₉ represents rolling force loss, RF is rolling force in the inlet stand, N is the inlet stand motor speed), and the first function generator An output indicative of the mechanical loss torque in response to the magnetic flux and speed of the inlet stand motor to generate an output signal indicative of the loss torque, the second function generator in response to the signal indicative of lubrication temperature and the inlet stand rolling force and the inlet stand motor speed; And generating a signal, wherein the motor loss torque and the mechanical loss torque signal are combined to generate a loss signal combined with the low tension control system of the tandem beam rolling mill. 3. The low tension control system of a tandem beam rolling mill according to claim 2, further comprising a draft compensation circuit connected to an inlet stand side motor controller responsive to the speed of the outlet stand side motor. 3. The low tension control system of a tandem beam rolling mill as claimed in claim 2, wherein a tension reference signal is applied to the seventh means to determine the minimum tension between the inlet and outlet stands. 5. The low tension control system of a tandem beam rolling mill according to claim 4, wherein the edge motor controller responds to the speed of the inlet stand side motor. ※ Note: The disclosure is based on the initial application.