AN IMPROVED PROCESS FOR THE CASTING OF FLANGED PIPES OR TUBES WITH BOLT HOLES AND APPARATUS THEREFOR.
Year: 1884

page_text: I, SAMUEL PEARCE WILDING, of the firm of Fell and Wilding, of 1 Queen
Victoria Street, in the City of London, Patent Agents, do hereby declare the
nature of the said invention for "AN IMPROVED PROCESS FOR THE CASTING
OF FLANGED PIPES OR TUBES WITH BOLT HOLES AND APPARATUS THEREFOR.
"
A communication to me from abroad by Heinrich Foersterling, Foundry Engineer,
of Charlottenberg, near Berlin, in the Empire of Germany, and in what manner the
same is to be performed to be particularly described and ascertained in and by the
following statement :-
The methods hitherto employed to cast flanged pipes with bolt holes have not
hitherto been successful, as however skilful the moulder might be, the diameters of
the holes and the distances between one hole and another were never true to the
template.
The present Invention is designed to mould flanged pipes so that independently
of the skill of the workman, the method and appliances employed shall ensure true
Circular shape of the holes and proper distance between one hole and another.
This process offers the further advantage of enabling the casting of the flanges to
be made with smooth surfaces without seams, thus dispensing with all finishing
operations such as turning, planing &c.
The Pattern and the core employed in this moulding process show the following
modifications from those usually in use.
Referring to the drawings herewith :-
The flange of the divided pipe pattern is supplied with a Cylindrical wooden
block, a, which is bevelled towards the flange, thus leaving a corresponding space
in the mould.
On the Cylindrical Pipe core is slid a core ring b. of the same diameter and the
same bevel as the before mentioned block, but of less thickness, and formed at tho

page_text: side towards the pipe body to serve as a mould wall for the flange to be cast in
This core ring is pierced with holes of the same diameter as are required for the
flange, the distances between the holes being also the same as those required
for the flange. When the Pipe Pattern has been moulded as usual in the divided
moulding box, the latter contains a clear space at the end of the mould of the shape
of the Cylindrical block (see figure 1) The Pipe core with core ring is now
inserted into the lower box, and the core ring is pushed forward on the core to the
bevel wall of the mould, and pressed against it. The cores c for the production of
the bolt holes in the flanges have been before inserted into the holes of the core
ring, and are now pushed forwards until they lie close against the walls of the
mould forming the flange. The core ring thus serves two purposes, i. c. that of
template for the true insertion of the bolt hole cores, and at the same time that of
a support for the latter.
The space left in the lower box outside the core ring is now filled up with
moulding sand and rammed down, then the upper box is placed in position and
the space in front of the core ring in this box is also filled (through the upper
opening o) with sand and rammed down. If necessary, the cores of the bolt holes
in the upper part of the Core ring, are again pressed against the wall of the mould.
The mould is then ready for running the metal.
For this
When flanges are to be cast, the holes in which are to correspond to one and the
same template, a special device is required; to always ensure that the core rings are
slid upon the pipe core, so as to exactly correspond to one another.
purpose the following core box has been designed to produce the core ring.
The shape of the core ring is turned into a wooden block h. Fig 4. supplied at
its bottom with recesses m, corresponding to the bolt holes. The core box thus
formed is supplied with a cover l, Fig 3, preferably made of laths in the form of a
star. This cover is also supplied with holes n. corresponding to the bolt holes
required. This cover may now be placed over the core box so that the holes are
exactly in juxta position. It requires now only the insertion of the Cylindrical
Pins, 8, of the right diameter into the opposite holes of the core box and cover
before the pressing in of the core sand to obtain core rings exact duplicates of one
another To ensure the cover being always placed in the same position to the box
after a covering has been withdrawn it is supplied with dowell pins p fitting into
corresponding recesses in the box.
The following advantages are obtained by this method.
1. By means of the arrangement of the flange on the pipe pattern with a face
core the movement of the flange on the pattern is obviated for lifting out of
the sand and a fixed and certain position of the flange to the axis of the pipe is
ensured.
2. As the wall of the mould for the front surface of the flange is formed by the
core-ring the same has a smooth face free from any seams and may if desired be
cast with stuffing grooves or furrows.
3. As the core-ring when inserted in the mould is exactly guided and firmly
pressed into the sand after having been placed in the right position a movement of
the same during the casting operation is avoided so that the front surface of the
Bango is always perpendicular to the pipe.
4. The bolt holes of the cast pipes are formed exactly circular and the distances -
between them are correct.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is
-
In a moulding process for the production of flanged pipes with cast bolt holes :—
1. The application of the core-ring b. perforated with holes according to the
template of the bolt holes required and slid on the Cylindrical pipe core for the
double purpose of forming the front moulding wall for the flange and at the same
* time serving as template and support for the cores of the bolt holes c.

page_text: 2. The combination of the pipe pattern with a block a. made in one piece with
the flange to form a recess in the mould for core-ring and to act as an exact guide
for the placing of the same in the sand.
•
3. The described arrangement of the core box with perforated cover b drilled
bolcs m. n. and pins 8. for the production of a series of duplicate Core-rings a.
Dated this 31st October 1884.
FELL & WILDING,
Agents for the Applicant.