Lubricant for hot forging applications
AssigneeHenkel AG & Co. KGaA
InventorsLaurent Hugues, Harold Gankema, Geert Heideman, Douwe Marten Kok, Gerko Odink
Life of this patent
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Abstract
A substantially lead-free lubricant for use in hot forging of metals, especially forging of aluminum and aluminum alloy components. The lubricant comprises one or more oils, graphite, and one or more phosphorus-based additives. Additional additives, such as metallic lubricants and dispersants may also be included. The lubricant does not burn when subjected to temperatures in excess of 300° C.
Claims25
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.
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 and 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 consists of:
- 15-40 weight % of one or more oils, including at least one mineral oil;
- 3-20 weight % fine graphite having a particle size distribution with about 90% of the particles below 15 microns in size;
- 30-80 weight % of one or more phosphate esters;
- one or more metal-containing fatty acid derivatives;
- and
- one or more dispersants.
Dependencies are inferred from the claim text.