Method of machining V-notch grooves for controlled fragmentation of warheads
AssigneePrecision Machining Services, Inc.
InventorWayne Michael Oettinger
Life of this patent
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Abstract
An improved method of machines grooves forming Pearson notches in a pattern on hollow shell casings for munitions for at least one of increased functionality and/or performance. Rather than running a broach through a hollow casing, a CNC lathe with a multi-axis tool with cutting implement can precisely locate and form grooves along either an interior or an exterior surface of a hollow shell casing.
Claims20
A method of manufacturing a fragmentation control pattern in armament shells comprising the steps of:
- (a) rotating a hollow shell casing about an axis, while simultaneously
- (b) linearly moving a rotating cutting tool along a surface of the hollow shell casing thereby cutting at least first and second walls to provide a first groove as a portion of a pattern of Pearson Notches about the surface of the hollow shell casing;
- and whereby
- (c) upon detonation of a warhead within the hollow shell casing, at least 90% fragmentation is achieved.
A method of manufacturing a fragmentation control pattern in armament shells comprising the steps of:
- (a) rotating a hollow shell casing about an axis with a CNC lathe while simultaneously
- (b) linearly moving a rotating cutting tool along a surface of the hollow shell casing thereby cutting at least first and second planes to provide a pattern of Pearson Notches about the surface of the hollow shell casing;
- wherein
- (c) a first length of a first groove forming a Pearson notch on a surface of the hollow shell casing has a first location with a first angle between first and second planes and a second location of the groove has a second angle between the first and second planes, wherein the first angle is at least five degrees larger than the second angle.
A method of manufacturing a fragmentation control pattern in armament shells comprising the steps of:
- (a) rotating a hollow shell casing about an axis with a CNC lathe while simultaneously
- (b) linearly moving a rotating cutting tool along a surface of the hollow shell casing thereby cutting at least first and second planes to provide a pattern of Pearson Notches about the surface of the hollow shell casing;
- wherein
- (c) a first length of a first groove forming a Pearson notch on a surface of the hollow shell casing has a first location with a first depth and a second location with a second depth at least 10% longer than the first depth.
Dependencies are inferred from the claim text.