Processes

Cold stamping

At SEBIR we transform steel for cold stamping.

The multi-station cold stamping machines consist of a series of punches and dies distributed in several phases or stations that deform the wire that has been previously prepared in our facilities (from the metallurgical and lubrication point of view).

The cut piece or block of wire is transferred from station to station where it receives deformations in each one of them that accumulate to end up in the final piece, generally bolts or special pieces.

What are the advantages of cold stamping?

Processes and diameter range

Our cold stamping steel manufacturing processes guarantee a high-quality product that meets the specifications of each customer.

SEBIR carries out a detailed preliminary study of the technical details requested by the customer to determine which processes the product requires.

PROCESSES

DIAMETER RANGE

K = +U+C

Ø 1,80mm to 42mm

GK = +AC+U+C

Ø 1,80mm to 42mm

KGK = +U+C+AC+LC

Ø 1,80mm to36mm

GKGK = +AC+U+C+AC+LC

Ø 1,80mm to 36mm

KGKGK = +U+C+AC+C+AC+LC

Ø 1,80mm to 30mm

GKGKGK = +AC+U+C+AC+C+AC+LC

Ø 1,80mm to 30mm

EURO STANDARD

GLOBULAR ANNEALING

ROUGH DRAWING

GLOBULAR ANNEALING

ROUGH DRAWING

GLOBULAR ANNEALING

COATING

FINISHING DRAWING

+U+C

+AC+U+C

+U+C+AC+LC

+AC+U+C+AC+LC

+U+C+AC+C+AC+LC

+AC+U+C+AC+C+AC+LC

EURO STANDARD

+U+C

GLOBULAR ANNEALING

ROUGH DRAWING

GLOBULAR ANNEALING

ROUGH DRAWING

GLOBULAR ANNEALING

COATING

FINISHING DRAWING

EURO STANDARD

+AC+U+C

GLOBULAR ANNEALING​

ROUGH DRAWING

GLOBULAR ANNEALING​

ROUGH DRAWING

GLOBULAR ANNEALING​

COATING

FINISHING DRAWING

EURO STANDARD

+U+C+AC+LC

GLOBULAR ANNEALING​

ROUGH DRAWING

GLOBULAR ANNEALING​

ROUGH DRAWING

GLOBULAR ANNEALING​

COATING

FINISHING DRAWING

EURO STANDARD

+AC+U+C+AC+LC

GLOBULAR ANNEALING​

ROUGH DRAWING

ROUGH DRAWING

GLOBULAR ANNEALING​

GLOBULAR ANNEALING​

COATING

FINISHING DRAWING

EURO STANDARD

+U+C+AC+C+AC+LC

GLOBULAR ANNEALING​

ROUGH DRAWING

ROUGH DRAWING

GLOBULAR ANNEALING​

GLOBULAR ANNEALING​

COATING

FINISHING DRAWING

EURO STANDARD

+AC+U+C+AC+C+AC+LC

GLOBULAR ANNEALING​

ROUGH DRAWING

ROUGH DRAWING

GLOBULAR ANNEALING​

GLOBULAR ANNEALING​

COATING

FINISHING DRAWING

Pickling

Pickling consists of removing the iron oxides from the iron and steel process. This is an essential process that must be followed by any steel wire before drawing, as the calamine or scale (iron oxides) is very hard and would cause premature wear on the tools.

SEBIR has two pickling processes:

Rough drawing  

This consists of reducing the wire cross-section by means of a wire drawing process with a perfectly defined geometry. The cumulative section reduction in rough drawing can be up to 90%. This is a technical and decisive process to obtain the best metallographic structure in the subsequent globular annealing process.

We have drawing machines capable of operating from 1.80 mm to 42 mm.

Globular annealing

HEAT TREATMENT

The globular annealing of the product is one of the critical points of the manufacturing process, as it will allow us to achieve the ductility and plasticity in the steel wire that will allow excellent deformability in the stamping processes mentioned above.

Our heat treatment section uses furnaces with green hydrogen technology for homogeneous heat transfer, which will allow us to obtain a high degree of globulisation with the minimum process time.

Furthermore, the automatic temperature and atmosphere control systems ensure that the process is carried out with the maximum homogeneousness of strengths and without decarburations.

SEBIR’s facilities use a computer system that ensures the traceability of each product, which guarantees a thermal treatment of the product without mixtures.

SEBIR can create personalised programmes according to customer requirements – phosphated or non-phosphated.

Surface treatment – phosphated or non-phosphated

Lubrication of the steel wire is crucial to avoid seizure of the product during stamping and cold extrusion, for which there are two processes:

CLASSIC PHOSPHATING PROCESS

This is carried out on an automatic bath line with high programming flexibility, which allows combining the phosphate coating with different lubrication coatings (reactive sodium stearate, polymer and carrier salts).

The automatic process control ensures that the quality requirements are always met by offering various coating options:

FINAL DRAWING OR SKINPASS

This type of drawing has four main functions:

  1. Straightening of wires that have been deformed in the annealing process to guarantee maximum productivity in our customers’ machines.
  2. Leaving residual compressive stresses on the surface of the wire which limit the possibility of small surface cracks opening up during the stamping process. In the case of TSF phosphate-free wires, it allows these to be produced by adding the lubricant under high pressure during the final drawing.
  1. TSF©: Phosphate-free drawing (0.0%).. Note that this system stands out for its sustainability, as it reduces CO2 equivalent emissions by 83.4 kg / ton of TSF wire.
  2. Manufacture of wires with the PHP©: high deformation phosphates system, which allow high deformability. In this case, the lubricant is injected at high pressure on a previously phosphated wire, which allows the manufacture of very complex parts that require practically hydrodynamic lubrication for their stamping.

Quality control and integrated management system (IMS)

SEBIR is certified to IATF 16949, ISO 14001 and is in the process of obtaining ISO 45001 certification and ISO sustainability standards 14064 and 14067.

In terms of quality control, no SEBIR material leaves the factory without certification. Our Quality Department is in charge of analysing the product before its dispatch to check if it complies with the technical specifications requested by the customer.

Our professionals also carry out a strict internal process control to ensure the proper functioning of the machines and optimum results. On this line, one of the most critical points is the control of mixtures. On this point, our traceability system guarantees this critical aspect.