The most common problems with new groove trial rolling are difficulty in biting and slipping of the rolled piece in the pass after biting, resulting in steel stacking accidents.
In order to successfully bite the first steel, the following measures can be taken: remove the oil stains on the new groove, grind the groove with a grinding wheel, increase the surface roughness, and increase the friction force; Raise the roll gap of the new groove appropriately; Reduce the speed of the upstream rolling mill cascade of the new groove rolling mill by 2% to 5%; Turn off the cooling water for the rolling mill; If the intermediate rolling unit uses a small sample testing machine, the head of the small sample can be cut into a pointed shape with a laser cutting steel in advance, and then sent to the furnace for heating, so that it is easy to bite in during the trial rolling; During the trial rolling of the first rolling mill, a steel pushing coffee machine parts can be used to push the tail of the billet to help bite people.
Link to this article：Conduct trial rolling after changing rolls and grooves
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