Influence des traitements mecaniques de surface sur la rugosité, la dureté et la résistance a l’usure d’un acier Rb40

الملخص EN

Some machine components are subjected to high loads and when they are working in contact, damage usually occurs by a wear phenomenon.

Therefore, material of high mechanical properties is requested and developed manufacturing techniques are necessary to obtain the work piece.

Diamond ball burnishing and rotating pebble roller rolling which are two processes operating with plastic deformation of superficial layers, can lead to new geometrical and physical aspect respectively characterized by a criteria of Ra roughness and a criteria of HRB hardness.

Otherwise, the optimal effect of each of these two processes is conditioned by a specific shaping diet to each characteristic to obtain.

The aim of this paper is to compare the effect of the two processes.

The relative influence of the different shaping elements on Ra and HRB are considered.

Results show that the new state of superficial layers obtained is technically acceptable and presents a good technical-economic index when comparing to conventional production process.

The superficial layers generated by ball burnishing and roller rolling can be considering as a hardened surface (HRB = 87-90) and grinded surface (Ra = 0,9 – 0,22 μm).

Thence the wear measurement determined by material weight loss method revealed a wear resistance improvement of 98%.

Therefore, the behavior of the obtained surface is similar to polished surface.