초록 ▼

A method for the manufacture of heavy metal powder-based frangible projectiles which are relatively easy and inexpensive to manufacture and which exhibit a selectable variety of desirable physical and/or performance properties. The projectiles of the present invention are powder-based, preferably in

A method for the manufacture of heavy metal powder-based frangible projectiles which are relatively easy and inexpensive to manufacture and which exhibit a selectable variety of desirable physical and/or performance properties. The projectiles of the present invention are powder-based, preferably including predominately tungsten powder as a heavy metal, particularly a tungsten powder which includes a predominate portion of finely sized particles. Lighter metal powders, also preferably having a predominate portion of finely sized particles, may be employed in combination with the tungsten to achieve certain desired results. Importantly, the present inventor has found that inclusion of a non-metal matrix powder, also of finely sized particles, in a mixture of a heavy metal powder, such as tungsten powder, and a light metal powder, may be employed in a variety of combinations to produce a projectile which is fully frangible upon striking a target (no ricochet), or which is frangible after either partial or full penetration of a selected target, either a semi-solid (e.g., a gel block) or a solid (e.g., a 1/4 inch thick cold rolled steel plate at an angle of about 90 degrees).

대표청구항 ▼

1. A method for the manufacture of a frangible core for a projectile of a small bore gun ammunition comprising the steps ofblending into a dry blended powder mixture at least a heavy metal powder having a major portion of the powder particles thereof of a size less that about 325 mesh, a light metal

1. A method for the manufacture of a frangible core for a projectile of a small bore gun ammunition comprising the steps ofblending into a dry blended powder mixture at least a heavy metal powder having a major portion of the powder particles thereof of a size less that about 325 mesh, a light metal powder having a major portion of the powder particles thereof of a size less than about 325 mesh, and a non-metal matrix powder, the particles thereof having an average particle size of about 12 microns, said matrix powder being present in the mixture in an amount of between about 0.01% and about 1.2%, by weight, whereby said particles of said metal powders and said particles of said matrix powder are substantially uniformly distributed throughout said blended dry blended powder mixture as discrete individual particles, introducing a quantity of said dry blended powder mixture into a die cavity, compacting said dry blended powder mixture in said dir cavity at about room temperature employing a pressure sufficient to produce a non-sintered self-supporting core.