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US 5,743,121 AGranted
Reducible glass lubricants for metalworking
AssigneeGeneral Electric Company
InventorMark Lloyd Miller
Life of this patent
Estimating the term…
Abstract
A reducible glass lubricant on a metal workpiece provides a duplex film during hot working of the workpiece. A silicate glass powder which contains from about 3 to 50 mole percent of an oxide of bismuth, tin or copper is used for the reducible glass lubricant. During preheating in a preheat furnace the glass lubricant is reduced to the duplex glass film.
Claims6
A method of hot working a metal workpiece comprising the steps of:
- providing a metal workpiece,
- providing a glass lubricant which comprises a metal oxide in which the metal is selected from the class consisting of bismuth, tin, and copper,
- coating said metal workpiece with said glass lubricant,
- reducing the metal oxide to form a duplex lubricant film, and
- hot working the metal workpiece to produce a near-net-shape part with a good quality finish.
2 more elements
A method of hot working a metal workpiece comprising the steps of:
- providing a metal workpiece,
- providing a silicate glass powder containing from about 3 to 50 mole percent of an oxide of a metal in which the metal is selected from the class consisting of bismuth, tin, and copper,
- coating the workpiece with the silicate glass powder,
- preheating the workpiece with the silicate glass powder thereon producing a duplex lubricant film, and
- hot working the workpiece to produce a near-net-shape part with a good quality finish.
2 more elements
An article comprising:
- a metal workpiece,
- a reducible glass lubricant adhering to the surfaces of said metal workpiece, and
- said lubricant comprising a silicate glass powder containing from about 3 to 50 mole percent of an oxide of a metal selected from the class consisting of bismuth, tin and copper.
Dependencies are inferred from the claim text.