Common Accidents on the Site of High-speed Steel Rolling and Measures (1)

1. Jamming of steel

Reasons: ① The roll gap on both sides of the roll is inconsistent.

② The gap of the input box is severely worn, the gap is too large.

③ The axially fixed pressing block of the roll is not fastened, which causes roll error in rolling.

④ Incoming materials are out of square or severely reversed.

⑤ Long-term wear of the hole type is on the left or right side.

Measures: ① Adjust roll gap;

② Replace the input box;

③ Tighten the axial fixed pressure block to eliminate the roller error;

④ Remove the raw materials with serious detachment;

⑤ Change the slot.

2. Rolled piece do not bite

Reasons: ① The reduction is too large;

② The grinding groove is not good or there are water and oil on the surface of the groove;

③ The sliding plate on the inner side of the card-breaking shear is not welded or moved laterally;

④ The head of the incoming material is off square or has a large deformation during cutting, and it is stuck in the input box.

Measures: ① Reduce the reduction of this pass, enlarge the roll gap appropriately, and then press back to the normal range after normal rolling, the billet head is cut into a wedge or cone shape, when changing the roll or groove (When the rolling stop time is sufficient), press the head of the billet a little bit in advance, stop the machine and then go out of the rolling mill and return to the heating furnace to reheat.

② Grind the grooves in place to increase the surface roughness of the grooves and remove oil stains;

③ Check the shearing machine and rolling mill processing;

④ Remove the raw materials with severe head deformation or cutting.

3. Rough and medium-rolled slipping steel

Reasons: ① The reduction is too large;

② The grinding groove is not in place;

③ Turn on the cooling water in advance;

④ There is oil on the surface of the groove;

⑤ The gap between input guides is small;

⑥ The speed of the front frame has not been reduced (2.5% ～ 3%) just after the rolling.

Measures: ① Properly enlarge the roll gap and press it back to the normal range after normal rolling;

② Grinding groove in place;

③ Avoid turning on the cooling water in advance;

④ Remove the oil stain on the surface of the rolling groove;

⑤ Check the gap between the input guides;

⑥ Slow down after changing the roller and groove.

4. Head rolling steel during rolling

Reasons: ① The size of the rolled product in the previous pass is too large, so that when the rolled product enters the next pass, it is squeezed in the entrance guide plate to cause suffocation;

② Due to the uneven deformation of the billet head during rolling, the temperature of the billet head is low may cause the steel to split;

③ The rolling guide is seriously worn, the guide roller does not rotate, and the guide roller arm is loose, which causes the guide roller gap to change, causing steel holdback;

④The elbow of the rolled piece does not lead to the next lane, causing steel holdback.

Measures: ① Adjust the material type;

② Avoid low-temperature steel, pay attention to the condition of the billet head and avoid splitting the head;

③ Regular shut down to check the input and output guide to avoid holding back the steel;

④ Avoid elbows;

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