Reproducibility of straightening roller positions
- repetition of adjustments
- reproducibility of straightening roll positions
All straightening results, including the final curvatures of the material to be straightened, ultimately depend on the correct positions of the straightening rolls. It is vital, therefore, for the straightening process to display constant reproducibility.
In addition to being a precondition for constant results, reproducibility also minimizes unnecessary line stoppage times and it wastes less material during repeat set-ups. High speed and continuous availability also play a major role in minimizing costs.
Existing possibilities of achieving reproducibility differ in their use of reference points on the adjustable elements of a straightener and in the methods used to determine actual positions.
The most commonly used possibilities are:
1) Engraved veneer scales
2) Dial gauges
4) Screws; hex screws, slotted screws etc.
5) Knurled screws
6) Micrometer screws
7) Veneer scales on buttons
8) Collar screws with veneer scales
9) Machine knobs/tapered machine handles
11) Geared motors / stepping motors
12) Hydraulic / pneumatic cylinders
13) Automatic roll positioners
A solution is chosen which best meets the demands of local conditions and technical handling criteria. A combination of two of the above options is also possible, in which case the functions are divided into adjustment and position measurement.
Whatever option is selected it should not be forgotten that continuous documentation of the adjustment values is essential if reproducibility is to be achieved as planned.