Sheet metal is customarily produced by rolling in the form of a relatively wide strip. In order to provide strip metal of various commercially desired widths, usually much narrower than the as-rolled strip, the wide sheet is passed through a slitter or other continuously acting shearing device. This severs the metal lengthwise along one or more desired lines. The resulting severed edges of the product strips are usually characterized by sharp corners, indeed notably by more or less upset sharp configurations along at least one such corner of each edge. It may have other irregularities or projections which are undesirable for further processing or use of the strip coil. We pride ourselves on our ability to smooth each edge, so as to assure a burr-free condition with essentially no upstanding or sharp corners.
Oscillate, or Traverse, winding lines are metal processing lines that unwind metal strips from coils and rewind it traverse-style onto spools. There is no one traverse winding pattern that is best for every material. The level wind is done so that the turnaround point of each layer is the same. The index wind consists of programmed, stacked lanes, each with a specific programmed index to the next lane (also called step wind). The goal of traverse winding is to have a much longer length of metal strip wound onto a single spool. The best pattern for a given material depends on the material characteristics, handling conditions, unwinding requirements and payoff speeds.
Oscillated coils can have up to 25 times the linear footage and weight of a ribbon-wound coil, significantly reducing labor and downtime when the equipment stops for reloading and restarting.
Traverse winding minimizes the danger of breakage, damage, or twisting of the material being traverse wound. Metal strips may be spooled onto open cores (a straight cylinder) or flanged cores. With metal, as with any type of material, there are three factors that must be determined to produce a stable traverse wound spool: pressure (which establishes spool density), pitch (which determines the winding pattern), and pull (the tension, which is the most important factor in spool quality and appearance). Traverse position accuracy depends on a direct link between the rotational velocity of the winding spool and the increasing diameter as the spool grows. Specifically, a closed loop tension feedback system will cause the rotational speed to decrease as the diameter of the spool increases.