Kumar Steels
An ISO 9001:2008 CERTIFIED



We here at Kumar Steels uses best of the Technology in the manufacturing of springs. The manufacturing process and the technique carried out at our Works is detailed below. Spring leaves are sized to the required lengths, they are subjected to various processes like punching, eye rolling, cover/wrapper rolling, endcropping, taper rolling, and so on.

About End Heating & Taper Rolling

We also have a statef Taper Rolling machine for the manufacture of Parabolic springs. Leaves are heated in a Furnace and passed on the taper rolling mill, where the parabolic curve is created on the leaves. This operation is fully controlled by the skilled operators.

Eye Rolling & Hardening Furnace

The Spring leaves are then fed again in the end heating furnace for eye rolling. We have an automated eye rolling and lab cutting machine for the main, second and other leaves.
The spring leaves are then fed into a furnace with temperature controls where they are heated to the critical temperature depending upon the grade of the material used.

Cambering Machine & Tempering Furnace

After This the spring leaves are placed on a combined leaf spring cambering and hardening machine where the spring leaves are cambered to a predetermined curvature and simultaneously oil hardened by the rotation of the drum type cambering machine into the quenching oil bath.
The spring leaves are then fed into a tempering furnace, passing through various temperature controls, to relieve the stresses developed due to oil hardening. After tempering, the spring leaves are checked to ensure that they have attained the required hardness and tempered martensite structure

Shot Peenning Machine

Next, the spring leaves are passed through a shot peenning machine, which induces a residual compressive stress on the surface, thereby increasing the fatigue life of the spring(proposed).