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

Abstract

The morphological texturing of forming tool surfaces has a high potential to reduce friction and tool wear and also has an impact on the surface layers properties of formed material. In order to understand the effect of different types of tool textures, produced by nanosecond fibre laser, on the tribological conditions at the interface tool-formed material and on the integrity of formed part surface layers, the series of experimental investigations have been carried out. The coefficient of friction for different texture parameters (individual feature shape, including the depth profile of the cavities and orientation of the features relative to the material flow) was evaluated via a Ring Test and the surface layers integrity of the formed material (surface roughness and subsurface micro hardness) was also experimentally analysed. The results showed a positive effect of surface texturing on the friction coefficients and the strain hardening of test samples material. Application of surface texture consisting of dimple-like depressions arranged in radial layout contributed to the most significant friction reduction of about 40%. On the other hand, this surface texture contributed to the increase of surface roughness parameters, Ra parameter increased from 0.49 μm to 2.19 μm and the Rz parameter increased from 0.99 μm to 16.79 μm.

Approaches for Preventing Tool Wear in Sheet Metal Forming Processes

“…Micro-texturing the surface of deep drawing tools can significantly reduce friction in certain areas of the drawpiece [198]. Šugárová et al [206] indicated that a surface density of depressions in the area of 13% is preferred to reduce the value of the COF. An areal density of pits above 20% usually causes an increase in the COF and wear rate [198].…”

Comparison of Friction Properties of GI Steel Plates with Various Surface Treatments

“…The formability of steel plates and the shape of the final parts made from them depend on factors such as the material (its mechanical properties and surface microgeometry) [1,2]; the forming die geometry (die clearance, radii of the punch and die) and microgeometry (roughness of contact surfaces) [3][4][5]; the technological parameters (temperature, strain rate, blank holding forces, contact pressure, etc.) [6][7][8]; the properties of the tool's material (hardness, chemical composition, structure) [9]; and the type and amount of lubricant used [10].…”

Thin‐wall injection molding of polypropylene using molds with different laser‐induced periodic surface structures

“…The ablation with femtosecond‐lasers generates topographies characterized by periodic nano‐structured ripples that were recently used to modify the surface properties for an increasing number of applications . In particular, LIPSS have been successfully used to modify the wettability of steel surfaces , improve their tribological behavior , and increase hardness and wear resistance .…”