Bending, SFAM has a wealth of experience in manufacturing wire pieces!

 

Our teams have mastered all the bending solutions since 1978.
The quality of our production is the result of a real know-how.

 

Round threads, bending radius:
The bending radius must be in proportion to the diameter of the wire. For a standard wire, we consider Rm=1xØ
(Rm= average radius of the neutral axis, Ø= external diameter of the wire)

 

Example: for a Ø14 mm wire, the average radius should be 7mm.
It is possible to reduce the average radius to 0.5xØ, but this requires to stamp manually the part and create a set breaking point.
Optimal machine performance, complex and expensive tooling make it possible to provide 2D pieces with a short radius while at the same time maintaining high production speeds.

 

Square or flat threads, bending radius:

The bending radius is equivalent to the round thread’s one. However, wire bending leads to the “swelling” of the raw material, on the wire cut part. The tooling for this kind of operation is specific for each diameter.

 

Straight parts:

To fold a wire, you must squash it in between two press rolls on a determined length. This length is in proportion to the diameter of the wire.
Lg mini (mini length) =Ø
Example: for a Ø 10 mm wire, the straight length before bending is 100mm.
It is possible to reduce the straight length to 0, but this requires specific bending tooling or re-cutting, this having of course an incidence on the tooling cost.

 

Wire cutting:
The length necessary to finish a piece must be in proportion to the diameter of the wire.
For a standard wire, we consider that Lg mini (mini length) =1xØ
(Lg mini = straight length allowing to cut the wire after the bending operation of the neutral axis, Ø=external diameter of the wire)
Example: for a Ø14 mm wire, the normal straight length required is 7 mm.

 

The connection between the Diameter of the wire and Feasibility:

The diameter of the wire is a crucial factor in the definition of the bending level of complexity.
In fact, the thinner the thread, the easier it is to bend.