Many people think that the straightening machine and the leveling machine are the same product. Of course, there are similarities between these two machines,but there are also some differences between them. In this article, we will talk about the difference between them. You may have a better understanding of both machines.

Conventional straightening machines incorporate a series of large diameter work rolls. Typically, between five and eleven rolls are used. As the material passes through the rolls, it is alternately bent from the tangent of one roll to the tangent of the next. As a result of this bending process, coil set and crossbow is removed. However, because this bending motion is restricted to one axis, which also means up and down in the same horizontal plane, straightening machines cannot correct side to side strip length variations.

A similar machine used to remove coil set is the precision straightening machine. The precision straightening machine incorporates a series of relatively small diameter work rolls. Backups are used to maintain parallelism between the top and bottom rolls.

Because of their similarities, a precision straightening machine can be mistaken for a roller type corrective leveling machine. However, unlike the leveling machine, the straightening machine’s backups are fixed. As a result, a precision straightening machine is also limited to the removal of coil set and crossbow. Similar to the precision straightening machine, a corrective leveling machine incorporates a series of closely spaced relatively small work rolls. Along each roll are backups. However, the leveling machine’s backups can be adjusted to intentionally deflect a portion of the corresponding roll.

Thus, if the material contains an edge wave, the rolls are deflected at their centers and the opposing edge. This stretches the center and opposing edge of the strip while leaving the wavy edge its original length. This stretching equalizes the strip dimensionally resulting in flat material.

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