Straightening - Camu S. R. L.

Sheet metal has continuously evolved throughout history to adapt to the new performance and quality standards necessitated by makers of capital goods. The Straightening process is the first of three stages necessary to obtain a straight sheet metal and is the most requested of all, for it is the simplest and cheapest.

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Lower rolls are normally motorized by a gear motor, which provides the power necessary to push the sheet metal in its straightening process, while upper rolls work in neutral and are responsible for the pressure exerted on the sheet, thus determining the degree of straightness to obtain. The operator is tasked with the ability to choose the optimal degree and this is why his experience, as well as the choice of a good coil and facility rigidity can make the difference.

The most used rolls disposition are 3+2 in LFC models, 4+3 in LTC models and 5+4 in LTC plus models. However, Camu’s flexibility allows devising the best solution according to our client’s specific needs.

It is highly recommended to carefully clean the straightener before changing into a different type of material in order to ensure maximum efficiency and avoid any marks or blemishes on the end product.

The straightening

Straightening machine is designed for correction of metal curvature in the longitudinal direction of the sheet and is not intended to correct other deformations.  Metal coil curvature is formed as a result of winding metal into the coil

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Why straighten up?

If the strip has not been straightened after cutting, the pieces obtained from the strip keep the curvature of the coil.
This curvature causes considerable problems in the following working proces or assembly, problems that force the operator to discard the piece. Straightening eliminates these problems.

In addition, the no-straightened strip can also present the following problems:

• impact on the mould;
• scrape against the punches;
• Incorrect feed;
• difficulty in ejecting the workpiece and the scraps;

These problems are most evident when using stepped and more complicated mould. These situations cause frequent production stops, high maintenance costs, delays in deliveries, punch and die breaks.
Almost all of these problems can be avoided with good straightening.

Straightening also has its advantages in the infeed, as it allows you to:

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• better penetration of the strip into the mould
• better feeding quality. The straightening set up by the rollers on the strip reduces the tendency of the sheet to form wrinkles, achieving an improvement in quality and smooth feed.
  As this effect is of short duration, in order to benefit from it, it is necessary to place the straightener in front of the press.