Plate and sheet leveling machine

What the machine actually does

Material passes through two rows of staggered rollers that bend it back and forth in alternating directions. Each pass works the surface past its elastic limit, and when the material leaves the nest it stays in the flat shape the rollers imposed rather than springing back to its coiled shape. The same principle straightens plate and flattens sheet — the difference is the roller size and the load class.

Classes of leveler

• Plate levelers: heavy builds for plate and heavy sheet, fewer large rollers, high load capacity. Used in structural and heavy fabrication.
• Precision sheet levelers: many small-diameter rollers for thin sheet where flatness is measured in fractions of a millimetre.
• Tension levelers: the material is held under tension through a small roller nest — the class that achieves the tightest flatness on thin strip.

Sizing one

• Thickness range — the minimum and maximum, because both ends of the range are hard.
• Width — the material width you need to process, which sets the roller length.
• Material and yield — high-strength steels need more passes and more load; aluminium behaves differently again.
• Required flatness — what the downstream operation actually needs; a laser blank tolerates more than a stack of punched parts that must mate.

Where it fits

In a laser line the leveler sits at the infeed, because a bowed sheet cuts to a bowed part. In a press shop it feeds the blanking shear or the press brake. If your parts fail fit-up after cutting and the blank was cut from visibly bowed stock, the leveler is the machine you are missing — and no amount of press brake tuning will recover it downstream.

Related reading: press brake crowning,fiber laser cutting machines,reading a spec sheet, andhow to buy a machine.