September 17, 2019
(3) Control speed and tension can not change too fast. The strip surface is scratched by the roll surface. By strengthening the process on the quality of the inspection, can eliminate the scratched substrate into the galvanized line.
Other roller scratches
Other roller scratches are scratches caused by
full-line rollers, steering rollers, tension rollers, roll-off rollers, which
are divided into wholesale Coated sheet
manufacturers drive rollers and non-drive rollers. It is believed that the
direct cause of this failure is that the speed between the strip and the sunken
roller is different, and the roller system does not turn or rotates, so that the
strip is in contact with the roller body.
Equipment installation and use of the improvement: (1) roller processing after installation to check the surface roughness and groove is chamfering, with or without burr, with Spring love song CYLQ334 or without injury. (4) sunken roll in the use of zinc into the pot before the first must be placed in the oven preheat, the temperature is close to the temperature of zinc is appropriate. Preheating purposes: First, through the slow preheating to reduce the temperature difference between the zinc pot is too large lead to burst burst and parts of the sudden deformation, improve service life; the second is to prevent the hot surface of the dross is not easy to remove, (5) roller into the zinc pot must be the surface of the zinc pot scum fishing net, bearing position and shaft hole can not stick slag, to prevent the roller stuck does not turn.
Sink roll scratches
Sunken roller scratches the strip out of the zinc pot
on the board after the intermittent or continuous strip of roller prints, if the
roller is lighter and no handle can be degraded, if the feel was scratched only
do waste disposal , Must stop for roll. The reason for this phenomenon is
multifaceted, because the sunken roller in the zinc pot of zinc in this special
location, no transmission equipment, but a driven steering roller, completely by
the process section of the tension and friction rotation.15% to 0.
The solution is: Process improvement:
(1) Zinc pot zinc solution
temperature control (460 ± 5) , in order to increase the mobility of zinc
liquid. (2) check the roller static balance, the appropriate increase in
counterweight. Therefore, it is the result of a common or single effect by
factors such as mechanical structure specificity, production process control,
installation and use of sunken rolls. The main reason for this type of scratches
is that the roller speed of the contact strip is not consistent with the running
speed of the strip, and the scratches caused by the relative sliding of the
strip and the roller. (3) installed after the preload to the test platform
(imitation zinc platform), check the level of parallelism to meet the
installation requirements of the drawings.05%, aluminum content should be
controlled between 0. At this point may be appropriate to add aluminum ingots to
reduce the iron content, which will help reduce the viscosity of zinc liquid to
increase the mobility of zinc liquid. If the bearing is not problematic, by
increasing the tension in the area, With the transmission friction to reduce the
scratches.
Substrate scratches
Substrate scratches are scratches on the surface of
cold-rolled substrates due to rolling or unwinding.
(2) At any time to
control and adjust the chemical composition of zinc liquid content, the general
control of iron content below 0.
The solution is: If you find a scratch, you
should immediately confirm whether the scratch before plating or plating after
scratches, and then determine the scratch area
Posted by: coatedsheet at
01:22 AM
| No Comments
| Add Comment
Post contains 694 words, total size 5 kb.
35 queries taking 0.0325 seconds, 46 records returned.
Powered by Minx 1.1.6c-pink.