Industry News

Analysis of the reasons for the difference in thickness of stainless steel strips

The influence of temperature change: the effect of temperature change of metallurgical spare parts on the thickness of stainless steel strip of rolling equipment is essentially the influence of temperature difference on thickness fluctuation, and the temperature fluctuation is mainly caused by the influence of metal deformation resistance and conflict factor.

Influence of tension change: Tension is to modify the metal deformation resistance of the rolling equipment by affecting the stress condition, resulting in a change in thickness. Changes in the tension of metallurgical spare parts affect the thickness of other parts in addition to the thickness of the strip head and tail.

When the tension is too large, in addition to affecting the thickness, and even the width will be changed, so in the hot rolling process, the stable small tension rolling of the micro looper is generally used, and the cold continuous rolling is rolled by the cold state, and the data processing hardening makes the deformation resistance very large.

It is difficult to achieve the required compression rate by adjusting the rolling equipment roll gap to change the rolling force, so it is necessary to use a large inter-frame tension for rolling. High tension is the main feature of cold rolling production.

The effects of metallurgical spare parts tension include: reducing rolling force and reducing rolling energy consumption; Prevent strip misalignment; Manipulating the strip plate shape and manipulating the strip thickness. Analysis of the reasons for the thickness difference of cold-rolled stainless steel strip

Influence of speed change: The speed is mainly through the conflict factor, deformation resistance, bearing oil film thickness to change the rolling pressure and the amount of pressure down.

The impact of roll gap changes: When rolling stainless steel strip, the roll gap of the rolling equipment will be changed due to the thermal expansion of the rolling mill components, the wear of the roll gap and the eccentricity of the roll, which directly affects the change of the thickness of the actual rolling.

Periodic changes in the roll gap caused by the eccentricity of the rolls and bearings of metallurgical spare parts cause periodic thickness fluctuations at high frequencies in the case of high-speed rolling.

In addition to the above factors, the shaking of the thickness and mechanical properties of the incoming material is also caused by the change of rolling pressure to cause the thickness of the stainless steel strip to change.

In addition, the calculation error of the metallurgical spare parts model setting, the accuracy of measuring the appearance, and the planning of the control system structure and control parameters will also affect the thickness accuracy of the strip.

In addition, the roll users of the plate rolling mill can also use equipment and process means to eliminate or reduce roll shedding under existing conditions on the basis of studying the operating parameters of rolling products, rolls and rolling mills of rolling equipment.