OBRABOTKA METALLOV

The paper studied the influence of films formed by epilamization on the performance properties of the fuel pump parts. Durability and contact stiffness of the surfaces after grinding and grinding+ epilamization in the 6SFK-180-05 lubricant composition are compared. Wear of the steel 45 samples in the raw and heat-treated state are performed on the 2070 SMF-1 friction test machine using a “drive-block” scheme. The results indicate that the surface after combined treatment (grinding+ epilamization) has a higher wear resistance compared with ground, both during running-in stage and at steady-state wear. Tests on contact stiffness of the ICE fuel pump parts (stop drive and control plates) performed in a special unit, simulating the operation of the regulator, shown that epilamization reduces the width and depth of the crushing grooves in comparison with the same parameters measured on the grinding surface. These parameters reduction is indicative of the contact surfaces with the epilam film coating stiffness increase. To find out the cause of the epilamization effect on the studied performance properties, further microgeometric and physical and mechanical characteristics of the surface layer, in particular, the surface roughness (Ra) and microhardness (Hμ) before and after epilamization and oil-retaining properties of these surfaces are investigated. Epilamization does not alter microhardness and roughness but increases oil-retention of the surface. In view of the immutability of microgeometric and physical and mechanical properties of the surface after epilamation, the increase in the wear resistance and the contact stiffness due to improved oil-retaining properties of the film coating surface are assumed.

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