Strip shape control method for hot continuous rolling of titanium and titanium alloy strip coils

Abstract

The invention discloses a strip shape control method for hot continuous rolling of titanium and titanium alloy strip coils in the technical field of hot continuous rolling. The strip shape control method mainly improves and controls the C-warping defect in the three stages of hot continuous rolling, slow cooling and leveling. In the hot continuous rolling stage, the convexity of a titanium and titanium alloy rolled plate is controlled within a small range by adjusting the original roll shapes of a finished product rack and a front finished product rack of a finishing mill group and adopting positive rolling configuration, so that C-warping deformation generated in the subsequent rolling process is reduced; in the slow cooling stage, the slow cooling time is prolonged, so that bending deformation caused by uneven heating of the titanium and titanium alloy strip coils is reduced; in the leveling stage, a pressing roller is additionally arranged in front of an inlet of a leveling machine to press a plate strip downwards, the plate strip can conveniently enter the leveling machine, the situation that all positions of the plate strip are uneven in stress in the width direction can be balanced through transition pressing, and finally the stress of the titanium and titanium alloy strip coils in the transverse thickness direction tends to be evenly distributed, and the C-warping defect and degree are greatly and effectively improved and controlled.

Description

technical field [0001] The invention relates to the technical field of hot continuous rolling, in particular to a strip shape control method for hot continuous rolling of titanium and titanium alloy coils. Background technique [0002] In the production process of plate and strip, the shape quality of the product is the key technical quality index. Plate shape defects mainly include two types: cross-section profile defects and flatness defects, and plate shape flatness defects are mainly divided into warpage and warpage defects. Among them, warpage is divided into transverse warpage and longitudinal warpage. Strip transverse warping, also known as C warping, is a typical representative defect of strip warping. The essence is the uneven distribution of residual stress inside the strip. The mechanism is that the longitudinal extension of each point on the cross section of the strip is in the thickness direction. Complicated bending deformation behavior due to differences and ...

AI Technical Summary

Problems solved by technology

In the process of continuous hot rolling of titanium and titanium alloy coils, titanium and titanium alloy strips also have transverse C-seeker-shaped defects, which lead to surface quality defects in the finishing and deep processing processes, and even cannot be processed.

Since the production process and control technology of hot continuous rolling of titanium and titanium alloys are significantly different from the production of hot strip steel, the cause and degree of C-warp defects are also different from those of strip steel, and the degree of C-warp defects in titanium and titanium alloy coils is even greater. Large, its warpage height Δh is usually 120-150mm, and even more can reach more than 200mm, its causes are more complicated, the control is more difficult, and it is also a common technical problem in the field of hot rolling of titanium and titanium alloys

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