Innovative applications such as creating surface texture on the tools have been evaluated to keep the friction between the sheet metal and the tool surface at the expected level and to reduce wear. Since the actual contactarea with the surface texture decreases, the friction coefficient decreases compared to the flat surface, especially in dry friction and in hot forming situations where lubricant can't be used. In all cases of friction, the wear products from the surface are trapped in the created textures. Thus, part quality and tool life couldbe increased. This study was carried out with a homemade testing device shown in Figure A that simulates exactly the movements of tool parts and sheet metal in the deep drawing process. Purpose: The tool surface texturing improves the tribological properties of reciprocating parts. Very limited studies have been found that examine industrial deep drawing parameters and the friction between the tool and sheet material during the deep drawing process by the process conditions. The aim of the study is to examine the friction conditions of the tool surfaces, whose surface texture was created by the shot peening process, with the test device developed to simulate deep drawing conditions. Theory and Methods: 1.2379 tool steel samples were shot peened to create surface texture with different peening times. CrN PVD coating was applied to each surface of the peened samples. Material characterization and process tests including hardness, surface roughness, almen height, coverage and contact angle were carried out. Friction test experiments were conducted to assess the effect of the surface texture created by shot peening on coated and uncoated metal samples under dry and lubricant conditions by comparing them with flat sample results. Results: Dry and liquid friction test results of uncoated and CrN coated textured surfaces were comparedwith flat surface test results. The kinetic friction coefficient decreased from 0.21 to 0.16 (25%) and from 0.15 to 0.06 (60%) in the case of dry and liquid friction, respectively. In CrN coated tribology tests, while there was no decrease in dry friction, the kinetic friction coefficient decreased from 0.09 to 0.05 (41%) in liquid friction. Conclusion: Based on the experimental work carried out in this study, it was shown that hardness increases after shot peening, which led to decrease the friction coefficient despite the surface roughness increase.The lower friction means that the amount of force and energy required in the process of forming the sheet metal will decrease proportionally to these values. It is recommended to be prefer surface texturing in the deep drawingprocess as it reduces the wear of the mold and the energy spent during manufacturing.
