IMPROVEMENTS IN THE MANUFACTURE OF BANDS OR HOOPS FOR CANNONS, CAST STEEL WHEELS CALLED. FULL CENTRES, AND OTHER FORGED PIECES
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by Walter Brierley at the Office of the
Commissioners of Patents on the 11th July 1883. Communicated to him from
abroad by La Société Anonyme des Aciéries et Forges de Firminy of Paris
.1
WALTER BRIERLEY of Halifax in the County of York. "IMPROVEMENTS IN THE
MANUFACTURE OF BANDS OR HOOPS FOR CANNONS, CAST STEEL WHEELS CALLED.
FULL CENTRES, AND OTHER FORGED PIECES." Communicated [to him from abroad].
by La Societé Anonyme; des Acieries et Forges de Firminy of Paris.
This Invention consists in improvements in the manufacture of bands for
cannons, cast steel wheels called full centres and other forged pieces (articles) by
means of a special system of dies or matrices by (mechanical) steam hammer
comprising the following parts
1 A lower matrix or die which forms at its bottom the lower surface of the
band the latteral surfaces forming the profile of such form and are curved slightly,
towards the top the depth of the hollow is greater than the height of the band to
be obtained the matrix or die is pierced at the bottom and in its centre by a hole
destined to receive a special hanging post
2nd A top matrix or die which carries at its bottom part a projection the lateral
edges of which are of the same shape as that of the lower matrix in which it can.
engage with a slight play this projection at the bottom corresponds in form with
the band and it is further in its vertical access traversed by a hole serving for
the passage of the hanging post; ordinarily with this hole a second has been
formed passing right through the matrix and serving to key the hanging post in
position
3rd A banging post which is composed of the body properly so called which the
form of a slightly conical truncated cone more pronounced towards the top and
which.terminates in a rounded surface the bottom of the hanging post terminates_
in a cylindrical point destined to engage with the whole formed in the lower.
matrix or die, the top of the banging post is pierced by an elongated hole which
forms the passage for the key.
The operation of stamping is effected in the following manner.
The hanging post having been placed in the lower matrix or die the blank is
placed above suitably heated and the upper matrix or die caused to strike; this
1

page_text: done, the key is caused to engage by the hole in the upper matrix which then
corresponds with that of the hanging post and the hammer is then raised the band
being raised and remaining suspended to the hanging post; it is then only
necessary to place the wedges below to prevent it descending again into the lower
matrix or die to withdraw the key, the hanging post then refalls into its place;
returning to the band it is then subjected to the same operation in the opposite
direction and the band is completed; it bears on its lateral faces a slight convexity
due to the curving out of the lower matrix or die By this process no burr is
formed all the heat of the metal is utilized and without all the repeated heating so
detrimental to the quality of the metal
r
This invention is not only applicable to the stamping of the trunnion bands
inclosed matrices or dies with the application of a special hanging post serving to
lift the piece after forging but also to the manufacture of cylindrical bands and all
other articles which by their form permit of the employment of these special tools
and particularly cast steel wheels called full centres,
In this manufacture the tools will consist
B
1 Of a lower matrix or die the bottom of which will correspond with the form
of the wheel and of which the lateral walls will form the felly
2nd Of an upper matrix or die engaging within the first so as to leave a space
corresponding with the form to be produced and lastly a special hanging post
The matrices may have various forms according to the articles, to be produced
they may have (trous de socs) air holes &e similar to all matrices and which are
necessary for this kind of work The blanks will be simple discs of cast steel
obtained by fusion or previously forged; these discs may be cylindrical or have a
profiled edge (with mouldings) and the wheels produced may be slightly rough
smooth or undulated.
}.
The following is the mode of forging employed in the preparation of the blanks
and the construction of the tools for the wheels The tools are composed-1st of a
lower matrix or die including a narrow striking block the surface of which is
convexed, such convexity increasing especially at the extremities; the middle of the
striking block has the sunken form of the nave and is pierced with a hole to receive
the hanging post; this matrix or die carries at its front part and towards the
bottom a second block hollowed out in a circular form. 2nd-of an upper matrix or
die of which the form of the striking block is exactly the same as that of the lower
matrix or die, at its front part this matrix or die carries a nose which corresponds
with the hollowed block in the lower matrix or die..
1.
3rd of a hanging post terminating at its lower part in a tail which engages with
the lower matrix or die: towards the upper part a simicircular groove is formed
which corresponds with a key hole, or way formed in the upper matrix or die
29.
The mode of operation is as follows: A disc is prepared the profile of which may
already correspond. with the wheel to be obtained this disc being pierced with a
hole in the centre with which engages the hanging post resting on the lower
matrix or disc, the striking is then carried on the disc being caused to turn at each
stroke, the diameter increases and the part corresponding with the table of the
striking block takes a double bi-concave form, the metal is especially forced out
to the periphery, to form the felly of the wheel; this operation being continued to
the desired point, a key is caused to engage with the hole in the upper matrix or
die which corresponds with the groove in the hanging post, the hammer is then
raised, the hanging post is raised and as it is slightly conical the blank is raised at
the same time, it is thus seized by means of a drag iron or stirrup (etrier) to place
it in a vertical position by causing it to rest on the hollowed block of the lower.
matrix or die-In striking the nose of the upper matrix or die is caused to bear on
the blank which is turned at each stroke so as to round it to the required diameter
The blank thus obtained is, then directly operated upon by the matrices or dies
in the manner, above described
ધર્મ
Another part of this invention consists in the preparation of the blanks
puddled iron or steel-These blanks are formed from a rolled bar which when it'

page_text: leaves the rollers and without any other preparation is twisted in spirals round a
mandrel ad hoc-The bar may be of rectangular section, but to ensure a better
guiding during the twisting a profiled bar is also adopted presenting projections
which form undulations on one side which are produced in recess on the opposite
face the thickness of the metal being uniform throughout, so that in twisting
such a bar the projections engaging with the opposed recesses prevent all dis-
placement of the whole This profile of bars, also presents the advantage of
facilitating the joining of the blank by increasing the contact surfaces, and further
it combines the advantages of flat and other joining while at the same time
facilitating the running of the slags during the heating-The blank thus prepared
is joined in the matrices and provided with the special hanging post above
described.