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US 5,688,339 AGranted
Oxy-fuel flame impingement heating of metals
AssigneeGas Research Institute
InventorsLarry Keith Farmer, Michael Dennis Lanyi, Joseph Scott Becker, Christopher Alan Ward
Life of this patent
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Abstract
Heating metal articles by direct surface impingement of an oxy-fuel flame without causing damage, or surface melting of the articles being heated. Flame contact is cycled to achieve maximum allowable rate of heat introduction thereby substantially reducing the time and energy required to achieve the final desired piece temperature.
Claims11
A process for rapid heating of a ferrous metal shape to a specified temperature which is required for a subsequent hot mechanical working operation of the ferrous metal shape to be heated, comprising the steps of:
- exposing said ferrous metal shape to direct impingement by an oxy-fuel flame;
- maintaining said oxy-fuel flame in contact with said ferrous metal shape until the temperature of the surface of said shape exceeds the maximum temperature to which the ferrous metal shape is to be heated, but below that at which surface damage begins to occur;
- removing said oxy-fuel flame from contact with said ferrous metal shape until said surface temperature has decreased by at least 100.degree. F.;
- alternately impinging and removing said oxy-fuel flame onto said ferrous metal shape in accord with the previous step until said ferrous metal is heated substantially by direct flame impingement to the specified temperature where the surface to core temperature gradient is diminished to a level permitted by the requirements of the subsequent hot mechanical working operation for the ferrous metal shape, and subjecting the ferrous metal shape to a hot mechanical working operation.
1 more element
Dependencies are inferred from the claim text.