Clearfield Republican. [volume] (Clearfield, Pa.) 1851-1937, 1873-10-29
CLEARFIELD, Pa, WEDNESDAY, OCTOBER %, 1878.
An Improved Process OF Casting
Metals,

Metals.
Recent experiments in England with
the process of casting metals under
continuous and considerable pressure
! an American invention, as many o.
our readers will remem mber-have beer
20 puccessful in producing perfect and
cleln castings as to win for this method
hesrty commeDdation from the British
pres. The processes may be briefly
described as follows. The article Ia
20 reproduced is finely cut medal
lio4, with. say, plain reverse. 1t ID
IN the first place laid face upward upon
lRfick smooth metal plate, fitted with
certain stops to keep The medallion In
position. The latter is then coated
over with a creamy mixture of kaoline
or china clay, and fine sand flour,
mixed with oil, the whole resembling
in consistency very thick paint. This
is laid on with a soft brush. The
plate and medallion are then placed in
the bottom of a flask OF great strength
made OF iron or gun metal. The very
finest description Of molding sand is
sprinkled over the medallion, first by
hand, and then the flask is filled up
about water measure with the same.
This being done, and the sand being
well tamped around the sides with a
wooden dolly, the flask is pushed be-
meath frame, in appearance not un-
like huge letter copying press. The
screw of this press is turned by two
men moving a long iron cross handle,
and a plate precisely fitting the in.
terror OF the flask is forced down on
the sand, after the manner of making
bricks by the semi-plastic process
The flask is then Withdrawn and the
sides opened, then the plate and the
sand removed, and reversed upon n
surface table, and the plate lifted off
The medallion is gently heated by a
gas blow-pipe; this expands 1t slight
ly, still further forcing its impression
into the sand; then on cooling down
1t contracts, becomes loose, and is
easily lifted out. The fine clay slip
makes beautiful smooth glossy sur
face lining to the mold. The mold is
the time h is ready 10 raee;va ,bo
metal IL forms n most fa;tbfnl ;mnres
sion of the object to be reproduced -
Any description Of mold can, of course,
be made, either single or in halves,
and with or without core as roon;rcd
More than n single costiog alsa mar
be comprised within one mold bloct
n senarate fgateD being nrov;ded CO..
each The mold has one LARGE or;t;oa
going ouite tbrougb II from side N
Side. The side gate 10 tho ma,rix oman
inp from IL
4 number of these molds beino ann
.plete, they are ranged in order Within
a proper casting case and compressed
by screw; the holes of all the molds
correspond and form a pipe or tube
terminating at the point where The
metal is TO enter. The orifice in the
casting case is fitted with A circular
clay collared nozzle, which nozzle il
fitted with clay plug which fits IL
tightly. A horizontal iron cylinder
communicates with this nozzle. and
within the cylinder works a piston
and rod, the rod passing out of the
end of the cylinder most remote from
the molds. In tho upper side of the
end of the cylinder iarthest from the
molds is q hole. surmounted by a hon.
per. AS the molten metal would at
once chill solid as n ring. whore II on.
countercd the cold metal of the cylin.
der, the latter is coated inside with a
"fettlingpofsome refractory substance
which il applied with a brush while in
semi.fuid state.
The modus operandf of casting is Tins
described The niston heinz drawn
back the molten metal is poI,red into
the cylinders. the piston is then cured
bv noans of mower aSnI;oJ
hebind % Tho n;s,on roJ A. ,hn n;s
IL simnlv a solid also q,
iine ,he cvlindor i,seif nrec;solr ad
ronces !, ,soranas 81 ~ lin;aso, ~
later and ,h;i l;n;na aurl;na
oaoc,naIlv aanLs H. s,,;s,on "a nno
vsn,s ,bc elcone ~ ~ not nse,oi m hv ldpaI
ooe For ,;ma ,ha oiar nin,,;a H.
novrle rcsis,s ,he nrossnre ps ,ba iron
urged ON Inv ,be pis,on n however
ia St last e,rcoJ IL and ,bo metal i'm
nelled ON bv the n;ston ia sorced into
ihc m;nn,est cronnv ~ ,ho Mold
cro,t and odvontaseons featnre oe tho
Process il The total oxclusion of tho
air Jnr;na ,ho nossaaa -, ,ho ;ror ;nto
Tho molds Tbis from ,bo accuracy
in maxim, tbe moIds bv ,bo oid ~
moch;nary and ,he snh:oouont sorc
;ns of ths metal in,o ,bem wbilo Tho
me n,se,oi ia au;d g;ves as n resnlt cas,;nas
homeceneous md free from
air blows, and The design of the ma.
=
ss,a .aa., 10 repFouuceu on .ne metal 80 per
.y , :na' 10 suosoiuo"s soG' enas'ns ,,,s
= .edu'a'.o' Nssas poVaoso sno o',Y,"a ,'s.n,
p"ps pSaa"ps pGs ,onrodmnaI1 I'i I, ~ nsr,oo, ~"
~ asGa -" nm. 20 v,u naa, 49,, ~ ~ S tSao