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Precision Roller Levelers



Bradbury introduced hydraulic leveling in the mid 1980s. Since then, Bradbury Hydraulic Roller Levelers have become the most versatile and efficient metal flattening machines available. We minimize adjustments by moving only the lower portion of the leveler. With brute hydraulic force, we can neutralize stress while delivering a premium quality product day after day. Development of world-class controls and a unique set of options, including our exclusive eDrive, have made our levelers the easiest to operate and most productive – while maintaining outstanding stretching and flattening repeatability. Join the hundreds of other companies around the world that profit from the Bradbury difference. Call us and let us tell you about the advantages.Get more news about Pcb Board Roller Leveller,you can vist our website!

Editor's Note: This article is adapted from Brownie Cox's conference presented at FABTECH® International & AWS Welding Show, Oct. 31-Nov. 2, Atlanta,© 2006 by the Fabricators & Manufacturers Association Intl. (FMA), the Society of Manufacturing Engineers (SME), and the American Welding Society (AWS).

The science of leveling metal strip has two main goals. The first is to make the metal's surface flat and ripple-free. The second is to neutralize hidden internal stresses that cause twist and bow in parts during secondary operations, such as stamping.

Every metal coil has unique characteristics. Before exploring the solutions, it's important to understand how the problems got there to begin with.A yield point refers to an elastic state, which is a measurement of internal tensions (see Figure 1). When flexed within this elastic zone, metal will spring back to its previous state. Metal forced beyond that point enters a plastic state, or plastification, where it becomes less resistant and more workable. The tensile marks the point where the material can fracture or crack.

The modulus of elasticity (MOE) indicates a strip's amount of stretch, or elasticity. For example, the MOE for aluminum is three times higher than that for ferrous materials. Aluminum is forced much more before it will lose its springback than the same thickness in steel. This suggests that more horsepower is required for aluminum than for steel or stainless steel. If a leveler is intended to work with both types of material, its horsepower must be rated for aluminum.

The Perfect Coil. Large, crowned rolls counteract deflection caused by enormous working pressures during the rolling process at the mill. These crowned rolls also help in steering the strip at high speeds as it's sized to the target thickness. Hydraulic pressure applied to the roll ends is needed to produce the final product's shape. If pressure from roll to surface is equal across the width, the length of the strip will be exactly the same at all points—creating the perfect strip.

Coil Set, Crossbow. These two problems appear in every coil and are relatively easy to solve. Coil set is caused by winding a coil under tension, which makes the outer surface slightly longer than the inside surface. When coil set is pulled lengthwise, the longer outside wrap will cause the shorter inside wrap to curl lengthwise, which is called crossbow. These two normal coil characteristics can be removed easily using a coil straightener or flattener to bend the strip back, equalizing the lengths.

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