The quality of the bar 3# double-length flying shear is not good. After the cutting of flying shears, the tail of the steel bar has a bending of about 200MM. How can we solve this phenomenon?
The flying shears cutting speed must be greater than the speed of the rolling stock. As for how much to advance, it should be explored in actual production, generally 5~10%. If the cutting speed is exactly the same as the rebar speed, once there is a speed fluctuation, then the next section of the head will be out of the bend, and the elbow will easily cause the pile.
Therefore, in order to be safe, the flying shears cutting speed should be slightly larger than the steel bar. In this way, the tail of the steel bar was forced hard, so it was bent. This bending will be reduced at the straightening plate of the cooling bed (if it is quenching, it will be difficult to reduce). In order to shorten the length of the cold cutting head, it is considered to take the lead coefficient of the 3# shear to be smaller, but it is not impossible to completely avoid the bending of the tail of the double-length steel, but the risk is a bit large.
Solution:
1. Check the blade of the flying shears. Adjust the gap and the flying shear speed.
2. The height of the guide groove before and after cutting needs to be adjusted to the appropriate height.
3. Adjust the starting coefficient of the double-length flying shear. If the tail of the double-sized ruler is bent, it is too small to cause the head to bend or even pile the steel. Fine adjustment of the lead amount until the cut is smooth, and the degree of curvature meets the requirements, and complete elimination is unlikely.
4. Check the start position and braking position of the flying shears, that is, whether the speed curve is reasonable.
