Sheet Metal Bending Brakes

Sheet Metal Bending Brakes Bendability

Bending capacity of sheet metal is the characteristic degree to which a particular sheet metal part can be bent without failure. Bendability is related to the more general term of formability, discussed in the sheet metal forming section. The bendability will change for different materials and sheet thicknesses. Also, the mechanics of the manufacturing process will affect bendability, since different bending tooling and sheet meetal geometries will cause different bending forces.

Plate Metal bending tends to be a less complicated process than deep drawing in the analysis of forces acting during the metal processing operation. One simple method to quantify bendability is to bend a rectangular sheet metal specimen until it cracks on the outer surface. The radius of metal brakes bending at which cracking first occurs is called the minimum bend radius. Minimum bending radius is often expressed in terms of sheet metal material bending thicknes. The higher the minimum bending radius, the lower the bendability. A minimum bending radius of 0 indicates that the sheet can be folded over on itself. Anisotropy of the sheet metal is an important factor in bending. If the sheet material  is anisotropic the bending should be performed in the preferred direction.

The condition of a sheet metal's edges will influence bendability. Often cracks may propagate from the edges. Rough edges will decrease the bendability of a sheet metal part. Cold working at the edges, or within a part, can also reduce bendability. Vacancies within sheet metal can be another source of material failure while bending. The presence of vacancies will reduce metal bendability. Impurities in the material, particularly in the form of inclusions, can also propagate cracks and will decrease bendability. Pointed or sharply shaped inclusions are more detrimental to bendability than round inclusions. Surface quality of the sheet metal also can make a difference in sheet metal plate bending manufactures. Rough surfaces can increase the likelihood of the sheet cracking under force.

To eliminate these problems, and optimize the bendability of sheet metal folding, care should be taken all the way through the manufacturing process. High quality sheet metal bending comes from high quality metal material.  Effective refining techniques, along with a sound sheet metal rolling process should close up vacancies, break up or eliminate inclusions and provide a sheet metal product with a smooth surface. Edge treatment such as trimming, or fine blanking, can improve edge quality. Sometimes cold worked areas can be machined out. Annealing the part to eliminate regions of cold working and increase ductility also improves metal bendability. Bending operations are sometimes performed on heated parts, because heating will cause the metal's bendability to go up. Sheet metal may also, on occasion, be formed in a high pressure environment, which is another way to make it more bendable.

There are many factors need to consider if you want to higher accuracy sheet metal bending performance, every details on metal bending difference will influence sheet bending results.

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