Patent ID: 8283296
Filing Date: 2012-10-09
Classification: C10M,C10N

Abstract:
1. A method of hot forging an aluminum or aluminum alloy comprising the steps of a) applying a coating of a lead-free lubricant to one or both of a hot forging apparatus or a workpiece, inserting the workpiece into the apparatus and forging an article from the workpiece or b) inserting a workpiece into a hot forging apparatus, simultaneously lubricating the workpiece and the hot forging apparatus, and forging the workpiece, wherein the lead-free lubricant comprises about 15 to about 40 weight percent of one or more oils including at least one mineral oil, fine graphite having a particle size distribution with about 90% of the particles below 15 microns in size, and 30 to 80 weight percent of one or more phosphate esters.