Influence of a heat treatment prior to cold forging operations on the performance of lubricants

• Published in: Tribology international Vol. 92; pp. 67 - 71
• Main Authors: Groche, Peter, Zang, Sebastian, Kramer, Philipp, Müller, Christoph, Rezanov, Vladimir
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2015
• Subjects: Cold forging; Disulfides; Forging; Forming; Friction; Heat treatment; Lubricant; Lubricants; Surface roughness; Temperature; Tribology; Forming; Temperature; Friction; Lubricant
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2015.05.028

Cold forging operations are subject to high tribological loads. In order to enable a reliable forging process, lubricants have to be chosen with respect to the occurring loads. However, it is known that well established lubricants can increase the surface roughness of a specimen in consequence of the forming. On the other hand, zinc-phosphate+molybdenum disulfide which is known to create a smooth specimen surface often shows higher friction coefficients. The paper at hand presents the results of a heat treatment prior to cold forging operations on the performance of polymer, saltwax, soap and molybdenum disulfide. The zinc-phosphate+molybdenum disulfide lubrication system indicates that a heat treatment of the lubricant results in a decrease of the friction coefficient. •We examine the influence of a heat treatment on the performance of lubricants.•We use a specialized tribometer and a rod extrusion process for the investigation.•The performance of MoS2 as lubricant can be improved after a heat treatment.•The friction coefficient decreases with increasing temperatures and treatment times.