Aktiebolaget Bofors

Lars Hellner

Torsten Ronn

Kjell A Albrektsson

Ingemar Haglund

A shell case comprising prefabricated fragments (4), preferably of a material with high density, and a supporting material which surrounds the fragments and together with these forms a connected shell which surrounds the explosive of the shell. The supporting material consists of a completely dense non-compressible material which is permanently connected with the pre-fabricated fragments, for instance a hardenable steel. The shell is preferably manufactured by a powder metallurgical procedure in which the supporting material in the form of a metal powder together with the pre-fabricated fragments (4) are pressed under high all-round pressure and high temperature into a dense compact jacket.

Shell case with non-compressible fragments metallurgically bonded to the

An explosive shell case of the kind in which fragments are produced by bursting of the case material into a number of small particles. The case material comprises a completely dense, non-compressible material which is made with embrittling zones (4) which when the shell bursts gives fragments of a predetermined shape. The case is preferably manufactured powder-metallurgically, the embrittling zones then being formed by filling at predetermined intervals with powder with the embrittling component. The case is then pressed under high all-round pressure and high temperature into a dense, compact jacket and is imparted its final properties through heat treatment.

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Karlskoga, Sweden

Lars Hellner