Elevated temperature metal forming lubrication method
AssigneeCleveland State University
InventorEdgar E. Graham
Life of this patent
Estimating the term…
Abstract
An improved method to lubricate a metal workpiece at elevated temperatures is described employing a novel polymer lubricant formed in situ. The novel lubricant is provided with a liquid mist of a vaporizable and polymerizable organic reactant being supplied to both workpiece and forming die at the elevated working temperatures.
Claims12
A method of forming a preheated metal workpiece with a forming die at forming temperatures of at least 250.degree. C. which comprise the steps of:
- (a) contacting the shaping region of the forming die with a liquid suspension containing at least 0.5 percent by volume of an organic reactant selected from the group consisting of aromatic phosphate esters and phosphazene compounds,
- (b) polymerizing the applied organic reactant upon further contacting the shaping region of the forming die with the workpiece while preheated to at least 800.degree. C. to form a solid polymer lubricant in situ,
- (c) forming the preheated metal workpiece in the lubricated forming die, and
- (d) removing the formed workpiece from the forming die.
A method of hot forging a ferrous alloy workpiece preheated to at least 800.degree. C. in a ferrous alloy forging die heated to about 150.degree. C. which comprises the steps of:
- (a) contacting the shaping region of the forging die under ambient conditions and while heated at the specified elevated temperature with a liquid suspension formed with a water-based emulsion containing an aromatic phosphate ester and an organic liquid solvent,
- (b) polymerizing the applied aromatic phosphate ester upon further contacting the shaping region of the forging die with the preheated workpiece to form a solid polymer lubricant in situ,
- (c) forging the preheated workpiece in the lubricated forging die, and
- (d) removing the forged workpiece from the forging die.
Dependencies are inferred from the claim text.