What are the reasons for the thickness variation of AZ60 ASTM A792 aluzinc steel coil? We conduct research and analysis on this, and find the following reasons:
1. Influence of temperature changes: During the rolling process, the temperature of metallurgical spare parts will shake the thickness of the steel strip. When the temperature changes, it will affect the metal deformation resistance and conflict factor, resulting in thickness changes.
2. The influence of tension change: The tension will affect the stress. Once the tension changes, it will also change the thickness of the steel strip, especially the thickness of the head and tail of the steel strip. Of course, it will also affect other places except the head and tail steel strips.
When the tension is too large, it will not only change the thickness of the steel strip, but also change the width of the steel strip. Therefore, during hot rolling, a micro looper can be used to stabilize the tension. During cold rolling, the rolling equipment needs to be adjusted. Roll gap to change the rolling force, even need to use a relatively large stand.
3. Influence of speed change: The speed mainly affects the rolling pressure and reduction of the steel strip through factors such as conflict factor, deformation resistance, bearing oil film thickness, etc., resulting in changes in the thickness of the steel strip.
4. Influence of roll gap change: During pressing, due to the thermal expansion of rolling mill components, roll gap wear and roll eccentricity, the size of the roll gap will be changed, and the thickness of the pressed steel strip will also be changed. change.
Of course, in addition to the above-mentioned factors, changes in the thickness and mechanical properties of the AZ60 ASTM A792 aluzinc steel coil material itself will also lead to changes in its thickness. In addition, if the metallurgical spare parts model itself has a large error in the calculation, it will affect the accuracy of the thickness of the steel strip.