International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

In the paper is presented a study regarding the influence of different factors on the roughness of machined surfaces obtained by manufacturing process of flat grinding. The workpieces that were used on the experimental tests were radial bearing ring with needles made of steel hardened to 60-64 HRC. It were taken into consideration factors like, the size of the machined surface, the traverse speed, the grain size of abrasive grinding wheels, cutting fluid.
During the experiments was used the method of the Box-plot graphical representation that aims to observe and characterize the distribution of values obtained on these tests.

The quality of the flat and cylindrical surfaces of the gear pump pinions is a restrictive condition for a suitable work. The required quality of these surfaces is very high, R = 0,04 – 0,08 µm. As well, there are restrictive conditions input for the form and positioning a deviations. So far, the manufacturing of these surfaces used to be achieved by grinding and no one could guarantee that the surface roughness was in accordance with the technical documentation. The presented constructive solution allows obtaining a good quality of the flat and cylindrical surfaces. It uses a superfinishing attachment that can be mounted on the engine lathe.