How a BSA spring is made

Industrial springs made of steel wire are applied in many sectors: the automotive, construction, hardware, furnishing, and agricultural sectors, as well as all those manufacturing or artisanal activities that require springs to be mounted on machinery and tools.

In our spring factory, we specialise in producing helical springs with wire with a diameter of 4 to 30 mm. BSA’s manufacturing approach is both artisanal and industrial: we are one of the few Italian companies specialising in producing small batches and single pieces.

Custom-made springs made of crude or prehardened steel

To bear significant loads, we produce springs that are larger than the original design, using high-quality crude or prehardened steel. The result is an excellent, custom-made product.

The whole process, from cutting the piece of steel wire to hardening, from pressing to painting the spring, is followed and controlled by expert technicians to ensure a truly reliable and long-lasting product, whatever its final destination.

Selection and cutting of material
1

Selection and cutting of material

The production of BSA industrial springs starts with cutting the steel wire, whether crude or prehardened, depending on the use and size desired.

From manual assembly to numeric control
2

From manual assembly to numeric control

Based on the diameter and pitch of the spring, the technician mounts the right spindle and sets the ratio between spindle rotation speed and that of the dolly. When the coil has a double diameter, the correct curve is obtained at all points of the steel wire using a lathe dog and tailstock. After checking the first spring, which is done by checking the machine manually, we then store the movements in the numerical control. In this way, the subsequent pieces are produced automatically, ensuring that movements can be repeated and, thus, the dimensions of the semi-finished product.

 

Deburring
3

Deburring

Carried out in the clamp after processing in the lathe, the spring is ready for the removal of any burrs...

Cropping
4

Cropping

...or for cropping, performed with a cutting disc.

Grinding
5

Grinding

If necessary, pendulum grinding follows.

Measuring
6

Measuring

When there is no need for pendulum grinding, the piece is directly placed in the press for measuring, i.e. for checking the vertical axis and leaving the necessary space for the spring’s give.

Hardening and tempering
7

Hardening and tempering

To reach the desired hardness, crude steel springs are subject to a hardening treatment and tempering in the latest-generation furnaces with controlled temperature, while prehardened steel springs are tempered at the temperature of 350/400° inside the well furnace.

Testing, painting...delivery!
8

Testing, painting...delivery!

At the end of heat treatment, the spring is tested with a press that compresses it and releases it. The processing of the custom-made spring is, at this point, complete. There is nothing left but to paint it, package it, and deliver your product!