Removing coils from york ycal1/5/2024 Quarter buckle is caused by the edges and center being shorter than the quarter width area. Correcting it requires stretching the edges. Correcting it requires stretching the center.Ĭenter buckle, also known as tight edges or oil can, occurs when the center is longer than the edges. Correcting it again requires simultaneously removing the coil set and crossbow.Įdge wave is caused by the edge or edges being longer than the center. ![]() (Such a scenario could lead to “saddle” stampings.) It is called “apparent” because the edge wave doesn’t appear in the unrestrained material. Correcting it requires simultaneous removal of the coil set and crossbow.Īpparent edge wave is the result of forcing material with coil set and crossbow in the opposite directions to lie flat. (Stampings from such a coil could lead to “dished” blanks.) It is called “apparent” because the buckle doesn’t appear in the unrestrained material. This is difficult to accomplish because the work is being done in the longitudinal direction while the problem is in the transverse.Īpparent center buckle is the result of forcing material with coil set and crossbow in the same direction to lie flat. Correcting it requires stretching the bottom width and compressing the top width. For positive crossbow, the top surface width is greater than the bottom. Correcting it requires stretching the bottom and compressing the top.Ĭrossbow is curvature (down positive, up negative) in the transverse direction. For positive set, the top surface is longer than the bottom surface. So what are the differences, and what can they do? Bent Back Into Shapeįirst, define the shape problems you are intending to correct.Ĭoil set (aka longbow) is curvature (down positive, up negative) in the longitudinal direction. ![]() Producer mills recognize flatteners and levelers by their capabilities.Īlthough each piece of equipment bends metal and the nomenclature implies the same functions, the actual machine and its capabilities differ significantly. If you need to work coil, do you rely on flatteners, straighteners, or levelers? The stamping segment of the industry tends to call anything that changes the coil’s shape a straightener, while service centers call them levelers (see Figure 1). The metal processing industry is no exception. As a result, it is easy for the astute person to become confused with nomenclature. In the English language, several different words often mean the same thing. Figure 1: In this equipment setup, a hydraulic roller leveler works material to level parts.
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