Improvements in the Production of Hollow Castings, and in Apparatus therefor.
Year: 1896

page_text: Date of Application, 8th Dec., 1896-Accepted, 23rd Jan., 1897
COMPLETE SPECIFICATION.
Improvements in the Production of Hollow Castings, and in
Apparatus therefor.
1, PER ERIK ÅBERG of Sandviken in the Kingdom of Sweden, Steel Forger,
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:-
This invention relates to the production of hollow castings and to an apparatus
adapted for this production. The process consists in casting the metal around a
tubular core, inserted in a chill, through which core a current of air or other
suitable fluid is led simultaneously, to remove the heat of the tube in order to protect
the tube from the heat of the molten metal and to keep it cool during the solidifying
of the metal.
In the accompanying drawings,
Figure 1 represents a section of a chill for carrying out this process, the hollow
core of the chill being connected with a blast pipe.
Figure 2 shows a detail.
1 designates the chill provided with suitable handles 2 for turning the same, and
below with flanges or lugs 3, which on the chill being turned are brought under
hooks 5 on the bottom plate 4, in order to retain the chill on said bottom plate.
6 is the above mentioned metallic tube serving as a core and preferably having a
conical shape in order that it may be more easily taken out of the casting. A
clay coating 7 surrounding the tube, facilitates the removal of the core from the
casting, said coating constituting a heat-protection casing. The tube can also
entirely consist of clay. The lower end of the tube passes through a central opening
in the bottom plate 4. A blast pipe 8 for blowing in air or other suitable fluid
opens into the tube 6. 9 is a bar, the outer downward bent end of which enters into
an opening in a lug 10 on the chill, in which lug it is retained by means of a
wedge 11. At the other end, this bar forms a clamp 12, clasping the tube 6 and
consisting of two parts, which are pivotally connected to each other. These two
parts of the clamp are held together by means of a pin 13 passing through them.
Screws 14 carried by the clamp 12 rest with their inner ends upon the tubular core
and serve to centre the same. For holding the tube any other suitable arrangement
may however be used.
When
As before mentioned the molten metal is cast into the chill around the tubular
core at the same time as, for instance, cold air is blown through the core.
the metal has cooled, the tube is taken out of the casting, which is thus provided
with a hole and which, by subsequent rolling or drawing over a mandril in the
known manner, can be worked into pipes etcetera. The chill is preferably made
conical, in order to facilitate the removal of the casting from the chill. Finally it
may be mentioned that the joints between the chill, the tube and the bottom plate
should be covered with clay in order to make them perfectly tight.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, 1 declare that what I
claim is,
1. The improvement in the production of hollow castings, which consists in
1:111 simultansonal landing

page_text: a current of air or other suitable fluid through said tube in order to keep the tube
cool during the solidifying of the metal.
2. An apparatus for carrying out the herein described process for producing
hollow castings, which consists of a clay tube or a metallic tube provided with a
clay coating, which tube is arranged within or passed through a chill and placed
in communication with a blast pipe, substantially as hereinbefore set forth.
3. The general construction and combination of parts taken as a whole forming
the improved apparatus for the production of hollow castings, substantially as described
and illustrated.
Dated this 7th day of December 1896
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.