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Casting P-900 Armorplate by the Expendable Pattern Casting Process.

PB93132009

Publication Date	1992
Personal Author	Hansen, J. S.; Turner, P. C.
Page Count	14
Abstract	Constant research and development on armorplate for armored military vehicles is required to shield troops against new ballistic threats. The U.S. Army Tank and Automotive Command requested that the U.S. Bureau of Mines assist in research on P-900 armor because of previous Bureau research on innovative expendable pattern casting (EPC) methods of casting steel. The Bureau of Mines developed a system for casting unique, slotted steel armor by modifying the conventional expendable pattern casting (EPC) process that is normally used for making aluminum castings. Three innovations were added to the EPC process to make the successful adaptation: (1) Vacuum was applied to sand molds, (2) continuous narrow-necked feeding systems were used to permit the casting of thin walls, and (3) fixtures were designed to prevent pattern damage and to hold critical casting tolerances. Potential problems and defects are described.
Keywords	Armor plate Steels Patterns Casting Foundry practice Molding techniques Molds Sand casting Castings Molding materials Armor Expendable pattern casting
Source Agency	Bureau of Mines Army
NTIS Subject Category	79B - Armor 71J - Iron & Iron Alloys
Corporate Authors	Bureau of Mines, Albany, OR. Albany Research Center.
Supplemental Notes	Library of Congress catalog card no. 92-23266.
Document Type	Technical Report
Title Note	Rept. of investigations/1992.
NTIS Issue Number	199305

Casting P-900 Armorplate by the Expendable Pattern Casting Process.

Casting P-900 Armorplate by the Expendable Pattern Casting Process.
PB93132009

Publication Date	1992
Personal Author	Hansen, J. S.; Turner, P. C.
Page Count	14
Abstract	Constant research and development on armorplate for armored military vehicles is required to shield troops against new ballistic threats. The U.S. Army Tank and Automotive Command requested that the U.S. Bureau of Mines assist in research on P-900 armor because of previous Bureau research on innovative expendable pattern casting (EPC) methods of casting steel. The Bureau of Mines developed a system for casting unique, slotted steel armor by modifying the conventional expendable pattern casting (EPC) process that is normally used for making aluminum castings. Three innovations were added to the EPC process to make the successful adaptation: (1) Vacuum was applied to sand molds, (2) continuous narrow-necked feeding systems were used to permit the casting of thin walls, and (3) fixtures were designed to prevent pattern damage and to hold critical casting tolerances. Potential problems and defects are described.
Keywords	Armor plate Steels Patterns Casting Foundry practice Molding techniques Molds Sand casting Castings Molding materials Armor Expendable pattern casting
Source Agency	Bureau of Mines Army
NTIS Subject Category	79B - Armor 71J - Iron & Iron Alloys
Corporate Authors	Bureau of Mines, Albany, OR. Albany Research Center.
Supplemental Notes	Library of Congress catalog card no. 92-23266.
Document Type	Technical Report
Title Note	Rept. of investigations/1992.
NTIS Issue Number	199305