Sheet Metal Bending

Share the information on Social Networks

Sheet metal bending and curving for component development.At Sumiparts SAS, we are specialists, we guarantee quality, compliance and good delivery times.

Plegado de platina

The bending and curving of sheet metal is an operation that consists of getting a piece with generatrices and rectilinear edges, exerting a force of a certain intensity, which causes a permanent deformation of the sheet metal according to the wanted curvature. Normally for this process we will use a press with a matrix .

Doblado y curvado

When we make a bent we can see that the outer part of the sheet and the inner part expand or compress , this is because the strength limit of the materials is not the same under traction than under compression, as materials have a higher elastic limit in compression, a greater plastic deformation will occur on the outside part of the material .

Este fenómeno provoca que el eje neutro no equidista de las dos superficies, de tal manera que este se encuentra más cerca de la superficie interna que de la externa, ya que la parte externa cede antes, debido a que su límite elástico es menos, también pudiendo depender del grosor de la pieza que estamos doblando.


Factors involved in sheet metal bending

  • Elasticity of the material : It is the factor that influences the recovery of the material , we must accentuate the bending angles. Therefore, if we want to perform a bend, we will have to do it at a higher value than the required to compensate elastic recovery .
  • Radius of curvature : Influences the thickness variation in a decisive way . Also in the appearance of cracks and subsequent breaks . Bends without an internal radius should always be avoided.
  • Direction of the fibers : It will depend on the previous lamination that has been subjected. Therefore, the direction where the fibers are will be of great importance because if we make a bend against the direction of the fibers , the test piece will have worse performance, worse quality and worse durability than if it had been done in favor of the fibers.

Doblado y curvado

When performing a bending operation, what we do is to make a small deformation of the material. A slight molecular shift in that part when bending is done.

Phenomena that occur in sheet metal bending

When making the bending and curving of sheet metal, what we are doing is compressing its inner part and stretching its outer part . Consequently, the fibers of the material suffer in the bending zone. The smaller the radius to be achieved, the more intense the requests will be.

Doblado y curvado

Smallest inside radius that can be achieved for a given material.

When the sheet is compressed or stretched on both sides, the particles change their position. There is a neutral zone where the stresses are zero and there is no deformation. The decentration of the neutral axis depends to a large extent on the thickness of the piece and the bending radius.

The designation of the neutral zone will be of great interest , since it will be essential to calculate the length of the bent profiles. It tends to move into the curvature when the ratio is smaller.

Doblado y curvado

Development of a bent part

To calculate the development , the position of the neutral line is determined. So the development of the piece will be the line of the neutral fiber.

La fibra neutra denomina la zona de un elemento doblado que no sufre ninguna deformación, sus fibras no serán modificadas a consecuencia de la tracción o compresión.

The neutral fiber is not always in the center of the sheet. This takes a different position depending on the thickness of the material and the radius of a particular bending. The calculation of the fiber is a basic element for the development at the time of bending the elements.

To calculate the fiber of an approximated shape , it is necessary to start from a flat piece with the appropriate profile. The aforementioned development would be calculated according to the average thickness line of the sheet if the bend retained thickness.

Doblado y curvado

ri=Intern ratio

Elastic recovery after bending and sheet metal bending

Llamado factor de retorno o recuperación elástica, a la recuperación de la chapa tan pronto como cesa la acción del punzón sobre la misma, es debido a la acción deformante a la que ha estado sometido la chapa, éste tiende a volver a su forma primitiva. Esta reacción es debido a la propiedad que poseen los cuerpos al ser elásticos.

When building a bending mold the return factor must be taken into account. With the intention of constructing the punches or matrices with the angles and modified ratio, so that the manufactured part is the same to measurements of the plane.

Elastic recovery varies based on the following factors:

Bending methods

Central action : it is a bending used to bend large profiles

Doblado y curvado

Side action : perfect bends are obtained, due to the small lever arm in which the punch acts. It is the most used system for bending small pieces.

Doblado y curvado

Front action : used mainly in profiles for closed or curved bends.

Doblado y curvado

Examples of different types of bends for machining parts.

Doblado y curvado

Si deseas saber más sobre este servicio de Doblado y curvado de chapa en SUMIPARTS estaremos en la mayor disposición de servirte. Deseamos brindarte los mejores servicios al alcance de tus manos. Ponte en contacto con nosotros llamando al Pbx: +57 748 22 13, Cel: 313 699 13 56 whatsApp  click aquí  o enviando un correo a info@sumiparts.com. Nuestro equipo técnico estará en toda la disposición de atenderle, te dejamos unos links que pueden ser de tu interés Sheet Metal Punching  

Sumiparts S.A.S

Sumiparts S.A.S

Give us a feedback

WhatsApp:
+57 (313) 699 1356

PBX: +57 (1) 748 2213

Contáctenos:

About Sumiparts S.A.S.

At SUMIPARTS S.A.S. We believe that your projects have to come true. We work together to provide technologies, tools and offer our best skills for the creation of our customer plans.

Recent posts on our blog

Síguenos en Facebook

en_USEN
Preguntenos por WhatsApp!