Firearms – Barrels
Patent
1984-09-26
1986-07-01
Kyle, Deborah L.
Firearms
Barrels
89 16, 138155, F41C 2102, F41F 1708, F16L 922
Patent
active
H00000825
ABSTRACT:
This invention relates to composite gun barrels along the lines that a bal be made of two or more different materials and of different outer diameters for optimum life and performance at different points along the length of the barrel. A composite gun barrel according to this invention includes a breech joined to a muzzle through a mid-section of the barrel by inertia or friction welding. Such a breech, muzzle and mid-section or mid-sections are made of different external diameters and wall thicknesses and of varying materials. A material more resistant to high temperature erosion and of larger outside diameter for high gas pressure is utilized at the chamber, while the material and wall thickness selected for use near the muzzle is optimum for frictional wear and lower pressure. A hot work tool steel such as H11 containing 1.5% Mn, 5% Cr, 0.4 V and 0.35 C is employed at the origin of rifling. Similarly, other remaining parts of the barrel may be made from a lower cost material such as SAE 4140, thus matching material properties to physical requirements as those requirements change throughout the barrel's length. A process for manufacturing said improved composite barrels is described to include inertia or friction welding of bars of dissimilar materials and of different diameters. It may also include rotary forging and/or machining of exterior surfaces to final dimensions, drilling of interior bore, heat treating and coating or plating.
REFERENCES:
patent: 2395044 (1946-02-01), Gorton
patent: 2775164 (1956-12-01), Tillander et al.
patent: 4333670 (1982-06-01), Holko
patent: 4387844 (1983-06-01), Frank
Dittrich William A.
Stanton Roger
Card, Jr. Harold H.
Kyle Deborah L.
Lane Anthony T.
Parr Ted L.
Sachs Michael C.
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