Superalloy mortar tube

a superalloy and mortar tube technology, applied in the field of mortar tubes, can solve the problems of adding additional weight to the mortar tube, high manufacturing cost of the cooling fin of the mortar tube, etc., and achieve the effect of excellent heat strength of the superalloys

Inactive Publication Date: 2006-12-28
UNITED STATES OF AMERICA THE AS REPRESENTED BY THE SEC OF THE ARMY
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  • Abstract
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  • Application Information

AI Technical Summary

Benefits of technology

[0006] In broad terms, the present invention is a mortar tube made of a superalloy. The superalloy may be, for example, one of cobalt based, iron based and nickel based. Because of the excellent heat strength of superalloys, the mortar tube may have an external surface that is free of cooling fins.

Problems solved by technology

The mortar tube cooling fins are expensive to manufacture and add additional weight to the mortar tube.

Method used

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Embodiment Construction

[0015] The present invention eliminates conventional cooling fins and reduces the wall thickness of mortar tubes by constructing the mortar tubes using a high strength superalloy. The superalloys are known and typically fall into one of three types, iron based, cobalt based and nickel based. In general, the superalloys have material strengths greater than 140 ksi at tube temperatures greater than 1000 degrees Fahrenheit. The use of a higher strength material permits a thinner wall thickness, as compared to conventional tubes.

[0016]FIG. 1A is a side view of a known 81 mm mortar tube 10. Tube 10 includes cooling fins 12 on the rear portion near the breech. The cooling fins 12 reduce the temperature of the mortar tube 10 from about 1160° F. to 1022° F. at presently required maximum rates of fire, i.e., 30 rounds per minute for 2 minutes and 15 rounds per minute sustained. These rates of fire are based on mortar ammunition having maximum design pressures of 15,800 psi. A separate blast...

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Abstract

A finless mortar tube is made of a superalloy. The superalloy is based on one of cobalt, iron and nickel. The finless mortar tube has an integrally formed blast attenuation device. The mortar tube may be 60, 81 or 120 mm. The mortar tube is capable of a substantial increase in the rate of fire compared to conventional mortar tubes.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit under 35 USC 119(e) of U.S. provisional patent application 60 / 522,510 filed on Oct. 7, 2004 and 60 / 522,566 filed on Oct. 14, 2004, which applications are hereby incorporated by reference.STATEMENT OF GOVERNMENT INTEREST [0002] The inventions described herein may be manufactured, used and licensed by or for the U.S. Government for U.S. Government purposes. BACKGROUND OF THE INVENTION [0003] The invention relates in general to mortar tubes, and in particular to mortar tubes without cooling fins and having reduced wall thicknesses. [0004] Mortars tubes presently used by the United States armed forces are generally available in three sizes of nominal inside diameter, namely, 60 mm (millimeter), 81 mm and 120 mm. The current 60 mm and 81 mm mortar tubes have cooling fins that function to reduce the tube temperature during firing. The mortar tube cooling fins are expensive to manufacture and add additional ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F41A21/00
CPCF41A21/34F41A21/20
Inventor WITHERELL, MARKBECKER, RICHARDSANTIAGO, JOSETAUSCHER, STEVEGEORGE, MICHAELESPINOSA, RAMONHATHAWAY, GEORGE E. IV
Owner UNITED STATES OF AMERICA THE AS REPRESENTED BY THE SEC OF THE ARMY
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