Zero-point calibration method for hot continuous rolling machine frame

Abstract

The invention discloses a zero-point calibration method for a hot continuous rolling machine frame. In the method, the current gap between rollers is smaller than the sum of the maximum extension length of an oil cylinder piston and the maximum bouncing value of the machine frame; an upper roller and a lower roller approach to each other through a position closed-loop system of a pressing position controller; the pressing position controller is automatically switched into a pressure closed-loop state; the rollers are continuously pressed under the pressure closed-loop by a method for progressively increasing a small rolling force every time; the average rolling force and roller gap on the two side in the time period are calculated; the pressing position controller is automatically switched to a position closed-loop state; and the rollers are moved downwards while the roller gap difference is kept until the zero-point calibration is completed and the rollers are uplifted. In the method, the rollers are leveled once before the zero-point force pressing, so that the balance state during the zero-point calibration is improved; and a circulation of the roller balance test and recalibration at the zero-point position is added after the first zero-point force pressing process is finished, so that the balance state of the rollers at the zero-point position is guaranteed.

Description

technical field [0001] The invention belongs to the field of steel rolling, and is mainly aimed at the calibration of each frame in a hot continuous rolling production line, and in particular relates to a zero point calibration method of a hot continuous rolling mill frame. Background technique [0002] At present, each stand (or last few stands) in the finishing mill of the hot continuous rolling production line is equipped with a hydraulic thickness control system, and each side of the rolling mill is equipped with hydraulic cylinders, servo valves, cylinder displacement sensors and rolling force sensors. . The stroke of the oil cylinder can be adjusted by controlling the servo valve, thereby changing the rolling gap to roll out steel plates of different thicknesses. During the hot rolling production process, by adjusting the rolling roll gap of each stand, different rolling exit thicknesses can be obtained, and finally the steel plate with the target thickness can be rol...

AI Technical Summary

Problems solved by technology

However, since the roll is a rigid body, the rolling force loaded on both sides has the characteristics of mutual coupling, so although we can obtain the same rolling force on both sides, we cannot guarantee that the rolling thickness on both sides is exactly the same, that is Leveling is less effective

Poor roll leveling will lead to inconsistent thickness difference on both sides of the steel plate rolled out by each stand during normal production, resulting in deviation of the steel plate

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