Improvements in the Manufacture of Cast Steel Projectiles.
Year: 1892

page_text: Date of Application, 19th Feb., 1892
Complete Specification Left, 19th Oct., 1892-Accepted, 3rd Dec., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Cast Steel Projectiles.
I, ROBERT ABBOTT HADFIELD, of Hecla Works Sheffield in the County of
York, Steel Manufacturer, do hereby declare the nature of this invention to be as
follows:-
This invention has for its object the production of a cast steel projectile which
combines a forged point, or forged point and shoulder, with a cast body and base.
To effect this I cast the projectile in a suitable mould having in its bottom or
lower end a suitable core.
The point end of the projectile when preferably cast uppermost, is subsequently
forged into the required shape from the top or sinking head end of the casting; but
if desired this arrangement may be reversed and the point end may be cast down-
wards. In either case that portion from which the point is formed, is made of
sufficient length and size to allow of its being afterwards forged out to the required
shape. By means of accurate dies the projectiles may be forged with sufficient
accuracy to avoid machining on the ogival part; or, if desired, such machining
may be performed in the usual way. After forging out the point of the projectile
to the required shape, the remaining portion is cut off therefrom and the projectile
is then ready for the ordinary finishing operations. Projectiles manufactured
according to my invention, though cast in one piece and at one operation, are thus
formed partly of cast and partly of forged material; at the same time they can be
manufactured with far greater economy and facility than heretofore, as by casting
in the core in the manner described, the projectile is formed without its being
necessary to machine out the hollow or core part; or if a certain amount of
machining is done, it is very much reduced in amount.
Projectiles so manufactured may be hardened by any of the methods usually
practised, and possess the advantage of being forged at the point, or at the point
and shoulder, where the hardening strains occur, at the same time that they are
sufficiently tough to hold together at the base, so as to effect penetration when
fired.
My invention is applicable to all classes of projectiles, whether of large or small
calibre, used for armour-piercing or penetrative purposes.
Dated this 19th day of February 1892.
ELT & Co.,
Agents for Applicant.
COMPLETE SPECIFICATION.
*Improvements in the Manufacture of Cast Steel Projectiles.
I, ROBERT ABBOTT HADFIELD of Hecla Works, Sheffield in the County of
York, Steel Manufacturer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
This invention relates more particularly to the manufacture of cast steel shells
and has for its object the production of a hollow cast steel projectile which com-
bines a forged point, or forged point and shoulder, with a cast body and base.
To effect this I cast the projectile in a suitable mould, having in its bottom or
lower end a suitable core.
The point end of the projectile is preferably cast uppermost, and is subsequently
forged into the required shape from the top or sinking head end of the casting;
D

page_text: but if desired this arrangement may be reversed and the point end may be cast
downwards. In either case that portion from which the point is formed, is made
of sufficient length and size to allow of its being afterwards forged out to the
required shape. By means of accurate dies the projectiles may be forged with
sufficient accuracy to avoid machining on the ogival part, or, if desired, such
machining may be performed in the usual way. After forging out the point of the
projectile to the required shape, the remaining portion is cut off therefrom, and the
projectile is then ready for the ordinary finishing operations. Projectiles manu-
.factured according to my invention, though cast in one piece and at one operation,
are thus formed partly of cast and partly of forged material; at the same time they
can be manufactured with far greater economy and facility than heretofore, as by
casting in the core in the manner described, the projectile is formed without its
being necessary to machine out the hollow or core part, or if a certain amount of
machining is done, it is very much reduced in amount.
Projectiles so manufactured may be hardened by any of the methods usually
practised, and possess the advantage of being forged at the point, or at the point
and shoulder, where the hardening strains occur; at the same time that they are
sufficiently tough to hold together at the base, so as to effect penetration when
fired.
My invention is applicable to all classes of projectiles used for armour piercing.
or penetrative purposes whether of large or small calibre.
DRAWINGS.
:
In the accompanying drawings, wherein similar letters of reference indicate
corresponding parts,
Figure 1 shews a view in sectional elevation of the shell as it appears when cast
in the mould. a is the moulding box. the composition or sand lining thereof.
c the shell casting with head or runner part c¹ cast upwards. d the core in the
bottom of the moulding box supported on spindle e, and^f the screw for tightening
up the core bar.
Figure 2 is a view in external elevation shewing the head or runner part c³ of
the shell casting e drawn out to form the point g and
Figure 3 shews a view also in external elevation of the shell when finished. The
dotted lines in Figures 2 and 3 indicate the hollow or core part of the shell.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
In the manufacture of hollow cast steel projectiles, the combination of a forged
point, or forged point and shoulder, with a cast body and base, all substantially as
hereinbefore described and shewn.
Dated this 19th day of October 1892
ELT & Co.,
33, Southampton Buildings, Holborn, London, Agents.
ELT & Co.,
33, Southampton Buildings, Holborn, London, Agents.