Improvements in Moulding and Casting Metal Pipes and other Articles of Cylindrical Form.
Year: 1888

page_text: COME LEIE SIMCITICATION.
Improvements in Moulding and Casting Metal Pipes and other
Articles of Cylindrical Form.
We, JOSEF KUDLICZ, manufacturer of Prague-Bubna, Bohemia and JORGE
AHLEMEYER Engineer of Bilbao, Spain do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
In moulding and casting by the methods hitherto known, the exterior mould.
requires to be renewed completely for every pipe to be cast. The purpose of the
present process is to so construct the main part of the exterior mould that it can be
employed repeatedly, so to say continually, thus offering a great economy of labor,
moulding material and fuel, as well as of tools.
We attain this end by constructing mould flasks in such a manner that the cast
pipe can readily shrink when cooling, without injuring the main part of the mould,
which is to be used again.
For socket pipes, we employ a main cylindrical part a made of two longitudinal
portions, the lower half (fig. 8, of which is provided with round trunnions & cast on,
for the purpose of rotating the complete flask, and also with binding screws and
guide-pins v. The said lower half can again be divided cross-wise at if it be
desired to use the same part a for making socket pipes for so called socket and spigot
joints, as well as flanged pipes.
Both halves of the flask are provided longitudinally with accurately planed ribs /
on the top surface and on the outer side, which bend somewhat inwardly for more
firmly holding the moulding material and which serve for fitting the halves together
and at the same time act as a guide for the stamping-model when the mould is com-
pleted. The inner periphery of the flask fig. 6 and 10, is provided with longitudinal
grooves for conveying away the gases which are produced when casting in said
grooves, and escape through holes made, say at d, fig. 1, 3 & 4, underneath the
opening through which the fluid metal is poured.
For holding the mass together, halves of steel rings are let into e: the inner
diameter of said rings, excluding the layer of graphite, about corresponds to the
external diameter of the pipe to be cast. The part a is bored out cylindrically for

page_text: receiving the socket covering piece made of one part the said piece is likewise
turned at its underface for placing the same upon the part a and receiving the head &
of the core spindle s.
Each trunnion of the part a has a square or other shaped hole for receiving a
square axis, if rotation is to be imparted by machinery.
For flange pipes, see fig. 4, the principles of construction as regards the flask are,
broadly speaking, the same, except that the lower piece as well as the absolutely
necessary upper covering piece gare preferably composed of two halves divided
longitudinally, capable of being readily separated, and provided with excentric binding
screws u fig. 4, 5, 14 and 15,
If requisite, the upper part can also be again divided
at the top, say at fig. 4.
At the lower half of the main part a and near the opening through which the fluid
metal is poured, is screwed a guide-bracket & for the upper end of the core-spindles :
at the opposite end are two binding screws which press the disk t of the core
spindle s against the lower part fand the latter against the built up part a. The
core-spindle s is thereby centered and the entire flask closed. In the case of flasks
for flange pipes, the upper party requires of course to be applied first and be suitably
connected to the part a.
For the purpose of making a mould capable of a continuous use, we employ a part,
fig. 6 & 7, composed of a guide-plate p connected with a half pipe-model and also
employ the caliber m fig. 9, the greater diameter of which corresponds, in shrinkage
measurement, exactly with the outer diameter of the pipe to be cast. The part for
forming a socket, the part for forming a flange and the upper part, fig. 11 & 12
are stamped in vertical position on a proper flange or socket model which is brought
on a stamping plate and are then removed by means of a wrought iron ring laid
underneath then by turning the flask the mould is separated from the model and
polished. Before removing the mould, the said ring has to be connected with the
mould flask w by means of pins passing through the flask w and engaging an outer
groove in the ring e, or otherwise; whilst on the contrary the upper part, used for
forming a flange, either entirely or with the upper part 3 is stamped horizontally
upon one half of a suitable pattern, see fig. 13, 14 & 15.
"
The operation is as follows: the damped special mass for the part a to be used con-
tinuously, after the pattern, fig. 6, has been secured against the flask half, is rammed
in by beginning at one end between it and the wall of the flask; at the same time,
wire pins are let into the grooves of the wall of the flask. After this space has
been rammed in, up to the height of the pattern, the pins are partly removed &
the pattern is displaced, the mass is again rammed in and so on until the mould
is completed. The requisite wider part of the mould for socket pipes, at the
opening for pouring in the fluid metal, is made by hand with the same fire-
resisting mass. After this manipulation, the half round pipe pattern is detached
from its plate p and again laid into the so produced mould, in order that the
longitudinal edges be rendered resistant by driving in hooked pins fig. 10.
After this has been done for both halves of the flask, the same
are screwed
together, then placed vertically, then secured and the exact pipe caliber m fig. 9.
is drawn through by means of a crane, after which the mould is blackened and
finally thoroughly dried in this screwed condition.
This mould can be used continuously, whilst the parts f, f, ffå for forming
the sockets and the flanges require to be made afresh, by means of the above
described apparatus, from ordinary moulding sand, each mould in its own flask or
simply as a sand ring in the same flask for each pipe cast; the said parts being
subsequently blackened and dried.
The core is made in the known manner, except that at the end for pouring the
fluid metal, i.e. there where the said opening vanishes into the mould, the, said
core is reduced to a thin annular portion n which, as the iron cools down, breaks
off owing to shrinkage, whereby both portions are detached from each other
Putomatically.
After every run of
metal and after subsomnily ramoving the
and

page_text: etting the flask up again, the mould is placed vertically and blackened by means
f a cylindrical brush and then allowed to dry for a short time by means of the
eat which it has absorbed.
The entire operation is therefore as follows: the mould is built up horizontally,
hen blackened vertically the upper and lower flange or socket forming parts are
itted on vertically, the spindle is introduced from the top vertically and is secured.
Finally, the whole apparatus is turned upside down and the molten metal is poured
n.
After pouring the metal, the apparatus is again turned upside down, the spindle
s removed vertically, the upper flask is taken off horizontally and finally the cast
ipe, together with the part for forming the socket, are removed whilst for flange
ipes, both parts have to be removed before separating the two halves of the flask.
For carrying out these different manipulations, the flask requires to be turned
n suitable supports, fitted and secured near the spot where the fluid metal is
lelivered.
Having now particularly described and ascertained the nature of the said inven-
ion and in what manner the same is to be performed, we declare that what we
laim is:
First. A process for making exterior moulds from two kinds of materials, viz.:
a) the main part, (for instance for socket pipes, the part a including the opening
for pouring the molten metal for flanged pipes, the part a alone), from a
mass which, owing to its constitution and owing especially to a very hard
stamping and thorough drying, will be fire-proof for the first casting and be
porous, and remain so for further castings, whilst
b) the remaining parts, (for instance the part for forming the socket and the
part for forming the flange, including the opening for pouring the fluid
metal), from ordinary moulding sand, in such a manner that by means of
the latter parts of the mould, the shrinkage can take place while the casting
is cooling, without injuring the main part of the mould, which, owing to this
fact, is capable of being used so to say continually.
Second. In combination with claim 1, that is to say especially for sparing the fire-
roof main part of the mould, we claim the enlargement of the core at the upper
nd, as shown in fig. 1 and 4 or any other formation of a thin annular reduced
ortion between the opening for pouring the molten fluid and the mould, for the
urpose of enabling the said opening to detach from the casting, as the same cools
nd shrinks.
Third. For carrying out the process contained in claim 1, we claim the general
rrangement of mould flask for making flange or socket pipes (fig. 1, 2, 3 and 4) in
ombination with the accessory tools, viz. the mould plate p with half round pipe
attern fig. 6 & 7, the caliber m fig. 9 and a device for stamping with moulding
material the parts which form the socket and the flange, fig. 11, 12, 13, 14 and 15.
1571 1
C
1 1000
For JOSEF KUDLICZ &
JORGE
AHLEMEYER,
Brandon & Son,
Agents.