Key points of cutting rolling material type control and guide and guard adjustment!
1, material type control points
1, the quality of the incoming material is good, the difference between the upper and lower sides is controlled within 2mm, and the incoming material of the 7# machine avoids the phenomenon of big head and big tail.
2, finishing rolling each pass material type error control within 0.2mm.
3, the key point of material type control: K5 material type can not be wrong roll, full degree is better, to ensure the accuracy of pre-cutting; K3, K4 to ensure a good roll, to prevent the rolled parts from twisting, resulting in deflection or uneven cutting or K3 outlet.
4, finishing roll of all frames must be equal to the roll seam, especially K3, K4, K5 roll seam.
5, rough rolling three incoming material control within the range of ±1mm, diagonal difference ≤2mm. 7# Incoming material is controlled within the range of ±0.5mm, and the difference between the upper and lower sides is only within the range of ≤2mm.
2, guide adjustment, installation precautions
1. The acceptance and confirmation work of guide and guard before the line is in place, and the basic parameters and functions of guide and guard should be mastered.
2, all the passes of the guide, beam installation must comply with the "three flat" principle, the distance from the guide roller to the rolling groove in strict accordance with the requirements of the operation process installation. The installation of K3 outlet guide should pay attention to the verticality of the guide and the guide box, and it is strictly prohibited to install the export guide skew, resulting in unilateral K3 export flying steel.
3, the guide roller adjustment center line should be symmetrical, guide roller clamping sample rod tightness should be appropriate, to prevent uneven cutting, cutting, and other accidents.
4, guide fixed to be strong: guide wire, holding plate top wire, holding plate locking screws, holding plate springs and other fixed to be strong, to prevent loosening in rolling, resulting in rolling.
5, 9# machine using the outlet torsion tube, the Angle should change, generally to about 30-40 degrees, the gap of the torsion guide roller is generally larger than the material type 4-8mm, the specific situation should be combined with the actual situation on the site (9# machine outlet torsion and the distance of torsion, the gap of the guide roller, the Angle of torsion).
6, the pile pulling relationship between the frames of the medium and finishing rolling should be suitable, especially the pulling steel between 8#, 9# and 10# will cause the first knife times the size of the product to change (east and west two lines without ribs).
7, 8# machine east and west roller gap difference affects the finished product between the two lines, under normal circumstances, 8# machine west roller gap affects the size of the east side of the finished product (the west roll gap is large, the east side of the finished product is large. Vice versa.) When the difference between the east and west lines is not very large (the size difference between the east and west sides is within 1mm), the quality of the finished product can be properly adjusted by adjusting the roll gap of the 8# machine to ensure the quality of the finished product, but it is strictly prohibited to adjust significantly (the premise is that the K3 and K4 imports are straight rolling grooves).
3, process control points
1, the adjustment of the three-wire difference is strictly prohibited by lifting the east-west beam adjustment:
A. Because there is a substantial difference in process control between three-cut and two-cut, the adjustment of lifting east and west beams will lead to changes in the size of the finished product in the middle line.
B. The stacking relationship of finishing rolling is not suitable, which will also cause the size of the finished product to change, especially the drawing between 8#, 9# and 2# sets will cause the size of the middle line to change.
c, the adjustment of the three-wire difference is difficult in the adjustment of the middle line difference (the premise is that the guide, beam, roll and other things are installed correctly), K3, K4, K5 inlet tightness directly affects the middle line difference.
d, K2 imports directly affect the level of the 3 steel on the 3# sleeve, at the same time, the relationship of K2 material type spread, shape change, whether K1 can be successfully imported.
2, process control guide points for attention.
a, K4 before the pre-torsion gap is generally larger than the incoming material 1-2mm.
b, K3 outlet cutting wheel clearance 4-6mm.
c, K3, K4 imports must ensure that the guide to the normal rolling groove, rolling adjustment of the three wire difference, it is strictly prohibited to adjust the K3 import guide, once the K3 guide is biased, in the cutting will form six head phenomenon caused by the pass.
d, K5 material type wrong roll will lead to K4 import clamping is not good, resulting in uneven cutting, K5 material type filling will cause quality problems in the middle line of finished products.
4. Problems to be summarized and analyzed
1, the middle line difference length, short, elbow adjustment method.
2, K5 torsion outlet Angle, the distance between the guide roller.
3, the east, middle and west three-line difference adjustment of specific ideas and mutual relations.
4, the use of K3, K4 pass, mainly concerned about the three lines out of K3, K4 material type
The influence of the filling degree and the size of the material type on the finished product lays a foundation for the further optimization of K3 and K4 pass.
5. Pay attention to the full degree and wide spread of K2 pass groove: the impact on the quality of the finished product; Effect on 3# looper.
6. Pay attention to the use of the clearance of the cutting wheel at K3 outlet, the service life of the cutting wheel, and the use of the cutting knife.
7. Pay attention to the influence of the change of 7# material type on the process control of each pass of finishing rolling and the impact on the quality of finished products.
8, pay attention to the wear of 8#, 9# machine pass, summarize the amount of steel of 8#, 9# machine pass.
9. Pay attention to the lifting delay of the 3# looper to ensure that the steel cut out smoothly bites into the K2 mill.
10. Pay attention to the corresponding relationship between the end size of the finished product, the material type control and the setting situation.
11, pay attention to the current change of the motor, the dynamic speed drop of the motor, the compensation time of the motor on the looper, the quality of the finished product.
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