Traverse winding is winding a coil or other strip of material onto a spool rather than in a coil. For example, a roll of duct tape is not transverse wound, but is rather made in a single coil. On the other hand, twine comes traverse wound, as do fishing line and spools of thread. Coils can only be built up so far before they tend to "telescope" and become impossible to control. Traverse winding, however eliminates the risk of telescoping and allows several coils worth of metal strip to be wound onto a single spool.
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.
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Traverse winding lines are metal processing lines that unspool metal strips from coils and rewind it traverse style onto spools. There is no one traverse winding pattern that is best for every material. Rather, the best pattern for a given material depends on the material characteristics, handling conditions, unwinding requirements, and payoff speeds.
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There are several basic traverse winding patterns.
- 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 taper wind causes each transverse layer to taper a certain amount from the edge to make a spool that is thicker in the middle.
- The reverse or inverse taper wind tapers from the edges toward the middle and requires flanged spools.
- The magpak wind has an index wind pattern on the ends, but with a level wind in between.
It is clear why a coil joining machine is needed in this process. The goal of traverse winding is to have a much longer length of metal strip wound onto one single spool. A coil joining machine of some form is needed to produce the lengths of metal strip necessary to fill a spool.
Some coil joining machines are partly automatic and partly welder operated. Some of them are fully automatic and stationary. In most cases, the coil ends are joined together abutted rather than overlapped. The coil joining machine will shear a square edge on the trailing end of one coil and do the same to the leading end of the new coil. The two ends will be abutted, and the weld head will be positioned either by the welder or by the machine itself. TIG (tungsten inert gas) welding is a common type of coil end joining because it produces strong welds and doesn't always need filler material. MIG (metal inert gas) and laser welding are also used in some applications. The type of weld is tailored to the material being processed.
The welds produced by a coil joining machine are consistent, reproducible, and of high quality. Because they are as strong as the parent material and of the same thickness, the welds have no trouble going through the traverse winding lines.
The Need For Coil Joining Machines in Traverse Winding Lines