Pre-forge aluminum oxide blasting of forging billets as a scale resistance treatment
First Claim
1. A method of treating ferrous material to be forged, which may have oxidation scale on the surface thereof, to inhibit the formation of oxides during heating for forging, said method comprising:
- removing oxidation scale from the surface of the material to form a cleaned surface, and forming on the cleaned surface a deposit of aluminum oxide which covers at least 10 percent of the area of the cleaned surface.
3 Assignments
0 Petitions
Accused Products
Abstract
A ferrous forging billet is treated before heating for forging by grit blasting it with aluminum oxide grit having a pre-blasting particle size in the range of from about 100 microns to about 180 microns, at a pneumatic pressure in the range of from about 60 psi to about 160 psi, and for a time period in the range of from about 30 seconds to about 60 seconds, so as to remove pre-existing scale from the surface of the billet stock, to roughen the cleaned billet surface and to embed particles of aluminum oxide in the cleaned and roughened billet surface, thereby to form a tightly adhering deposit of aluminum oxide particles which are dispersed over the billet surface and cover at least 10% thereof. This substantially inhibits the formation of oxides on the surface of the billet during heating for forging.
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Citations
18 Claims
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1. A method of treating ferrous material to be forged, which may have oxidation scale on the surface thereof, to inhibit the formation of oxides during heating for forging, said method comprising:
- removing oxidation scale from the surface of the material to form a cleaned surface, and forming on the cleaned surface a deposit of aluminum oxide which covers at least 10 percent of the area of the cleaned surface.
- View Dependent Claims (2, 3, 4, 5)
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6. A method of treating ferrous material to be forged, which may have oxidation scale on the surface thereof, to inhibit the formation of oxides during heating for forging, said method comprising:
- removing oxidation scale from the surface of the material to form a cleaned surface, roughening the cleaned surface, and embedding particles of aluminum oxide in the cleaned and roughened surface of the material so that the aluminum oxide particles cover at least 10 percent of the area of the cleaned surface.
- View Dependent Claims (7, 8, 9, 10)
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11. A method of treating ferrous material to be forged, which may have oxidation scale on the surface thereof, to inhibit the formation of oxides during heating for forging, said method comprising:
- grit blasting the material by impacting on the surface thereof a pneumatically propelled stream of aluminum oxide grit, said stream of aluminum oxide grit being propelled at a pressure and for a time period sufficient to remove oxidation scale from the surface of the material and to form thereon a deposit of aluminum oxide particles which covers at least 10 percent of the area of the cleaned surface.
- View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
Specification