Friction Evaluation of Laser Textured Tool Steel Surfaces

Abstract

Surface textures can be defined as a regularly arranged micro-depressions or grooves with defined shape and dimensions. These textures, if they are manufactured by laser ablation process, contribute to a significant improvement of the tribological, optical or various biological properties. The aim of this paper is to analyze the influence of the surface textures prepared by laser surface texturing (LST) at the friction coefficient value measured on the tool (90MnCrV8 steel) – workpiece (S235JRG1 steel) interface. Planar frontal surfaces of compression platens have been covered by parabolic dimple-like depressions with different dimensions. The morphological analysis of such manufactured depressions has been performed by laser scanning microscopy. Influence of such created textures on the tribological properties of the contact pair has been analyzed by the ring compression test method in the terms of hydrodynamic lubrication regime. The experimental research shown that by applying of surface textures with defined shape and dimensions and using an appropriate liquid lubricant at the same time, the coefficient of contact friction can be reduced nearly to the half of its original value.

The Influence of the Tool Surface Texture on Friction and the Surface Layers Properties of Formed Component

“…A ring compression test in a lubrication-free regime (dry contact) was performed in order to determine the friction coefficient of the contact pairs [17,38]. During this test, a ring-shaped test sample, which is produced of S235JRG1 steel according to EN 10027-1 standard, is axially compressed among the pair of compression platens.…”

Influence of Laser Texturing and Coating on the Tribological Properties of the Tool Steels Properties

“…Methods that improve the integrity of the surface and at the same time reduce the coefficient of friction between the contacting surfaces can be included among the options that allow the reduction of the coefficient of friction and the reduction of the thermal load. This includes options such as surface hardening, chemical-heat treatment (carburizing, nitriding and boriding), laser welding, laser texturing and, finally, coating (PVD, CVD) and others [11][12][13][14][15][16][17][18].…”