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Патент USA US3044097

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July 17, 1962
Filed Nov. 17, 1959
2 Sheets-Sheet 1
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July 17, 1962
Filed Nov. 17, 1959
2 Sheets-Sheet 2
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lowing detailed description when considered in connection
Alex Powers, 9498 York Road, North Royalton 33, Ohio
Filed Nov. 17, 1959, Ser. No. 853,665
3 Claims. ((31. 15—3)
(Granted under Title 35, US. Code (1952), sec. 266)
Patented July 17, 1962
with the accompanying drawings wherein:
FIG. 1 is an elevational view of the complete apparatus
of the present invention for removing cores from invest
5 ment castings.
FIG. 2 is a sectional-end view taken along lines 2—2 of
FIG. 1 and
FIG. 3 is an enlarged elevational view, partly in sec
The invention described herein may be manufactured
tion, of a portion of the apparatus of FIG. 2, showing
and used by or ‘for the Government of the United States 10 the investment casting and wires threaded therethrough.
of America for governmental purposes without the pay
Referring now to FIG. 1, there is shown an apparatus
ment of any royalties thereon or therefor.
11 for removing cores from investment castings 181 com
This invention relates to the removing of cores from
prising a stand having a plurality of pipe legs 12 secured
castings and, more particularly, toan apparatus for re
to a ?oor (not shown). The legs 12 are connected by
moving ceramic cores from investment castings by recip .15 welding or other suitable means to a cross member 13,
rocating the cores along a wire while immersed in a
also of pipe construction.
caustic bath whereby the chemical reaction between the
A pair of V-shaped members 14, as shown in FIG. 2,
molten caustic bath and the ceramic cores removes the
are secured to the cross member 13 with the legs of the
cores from the casting.
V depending down and away from the cross member 13.
It has been the practice in the past to remove ceramic 20 The members 14 are inter-connected at their lower ‘ends
cores from castings by simply immersing the casting with
by a pair of bars ‘15 by welding or any other suitable means
the cores therein into a caustic solution whereby the leach
whereby a rigid unitary structure is provided.
ing of the caustic solution would slowly remove the cores
A U-shaped hangar comprising rods 16 and bars 28
from the casting. Since only the core portions near the
and 29 is connected to the bars 15 as shown in FIG. 2 with
end of the core are exposed to the caustic solution, it took 25 the rods 16 connected to the bars 15 by the insertion of
considerable time to remove cores in this manner and when
their ends through holes in the bars and thelower portions
the reaction products accumulated on the ceramic cores
because of the lack of means for carrying them away, the
reaction between the solution and the cores would be
essentially stopped.
Another method for removing the cores from the cast—
ing has been to use ?exible drills. However, this method
has proved to be quite expensive and impractical in cases
where a large number of small holes are present in the
_ of the rods 16 are immersed in a ‘molten caustic bath in
container 17 which may be of a material such as Mullite,
as shown in FIG. 1.
The investment casting 18, in this case a small turbine
blade, has a plurality of tube-like ceramic cores inserted
therein, as shown in FIG. 3. An actuator rod 19 is
secured rigidly at its lower end to the casting 18 by weld
35 ing or other suitable means and the upper end is bent in
investment casting.
a horizontal position and inserted through a hole in the
The present invention overcomes the di?iculty of the
bar 21, as shown in FIGS. 1 and 2.
reaction products accumulating on the core as the leach
The middle portion of the bar 21 is rectangular in cross
ing process takes place because a plurality of wires are
section; however, the ends of the bar are circular in cross
provided for insertion through the ceramic cores and the
section and a pair of sliding cams 122 are slidably mounted
castings are reciprocated in a caustic bath relative to the 40 thereon. A guide member 23 is rigidly connected to each
wires whereby the wires act as a means for ‘carrying away
of the legs 12 and a rod head 24 is connected to each end
the reaction products.
of the bar 21 and provided with an aperture slidably
This apparatus for removing the cores also has advan
mounted on the guide 23v whereby the movement of the
tage over the previous apparatus for drilling with small
45 bar 21 is limited to a vertical movement by the guides 23
?exible drills in that it is less costly and also it is a more
and rod heads 24. _
positive apparatus for removing cores. The reciprocal
The means for imparting the vertical movement to the
movement of the cores relative to the wires also provides
bar 21 and rod 19 is a gear motor 25, chain drive 26 and
a mechanical abrasion to aid in removing the particles of
sprockets 27. The sprockets 27 are rotatably mounted
the ceramic which have accumulated within the casting.
on shafts rigidly connected to the cross member 13 by
An object of-the invention therefore is to provide an
brackets not shown. The cams 22 are pivotally connected
improved device for removing cores from investment cast
to the sides of the sprockets 27 and as gear motor 25 turns
the sprockets 27 in the counter clockwise motion, as shown
A further object of the invention is to provide a device
in FIG. 1, the earns 22 move in a circular direction and
for removing ceramic tubes from investment castings by 55 impart a vertical movement to the bar 21.
bringing fresh caustic material in contact with an appreci
As shown in FIGS. 2 and 3 the rods 16 are rigidly con
able area of the core.
nected at their lower ends by a bar 29 and a similar bar
A still further object of the invention is to provide a
28 rigidly connects them slightly above their mid-portion.
means for removing exhausted caustic ceramic solution
A plurality of stainless steel wires 31 are threaded through
from the active ceramic caustic interface in order to speed 60 the tubular ceramic cores in the casting ‘18 and are looped
up the leaching process of a caustic bath and a ceramic
around the bars 28 and ‘29 and a suitable clamping means
such as clamp 32, shown in FIG. 3, secures the looped
A still further object of the invention is to provide a
mechanical device for providing abrasion to remove par
‘From the above, it can readily be seen that the device
ticles of ceramic from the cores of an investment casting. 65 provides a novel means for removing the ceramic cores
A further object of the invention is to provide a simple
from the investment casting 18 by the reciprocal move
and durable apparatus for effectively removing cores from
ment of the casting 18 along the wires 31 while submerged
castings without the use of drills or speci?cally designed
in the caustic bath within the container 17. Since the
wires 31 are stationary and the member 13 is moving rel
Further objects and advantages of the present invention 70 ative thereto, the wires will remove any reaction products
will be more readily understood by reference to the fol
deposited in the cores due to the chemical reaction be
tween the cores and the caustic bath, While at the same
time bringing into contact with the inside of. the ceramic
tubes, fresh caustic material. Also, the wires 31 act as
a mechanical abrasive means to Wear away the cores as
the casting 18 moves relative to the wires 31.
' Although only one pair of rods 16 and one casting 18
are shown within the drawing, it is to be understood that
What is claimed is:
1. In an apparatus for removing ceramic cores from
investment castings immersed in a caustic bath the im
provement comprising, a ?rst means coaxially disposed
within said cores and extending therethrough and a second
means for moving said cores and casting relative to said
?rst means whereby the reaction products within said
a plurality of rods 16 and castings 18 could be operated
cores are removed.
2. The apparatus, as de?ned in claim 1, in which said
at the same time merely by providing a U-shaped frame
member such as the frame formed by the rods 16 and 10 ?rst means comprises a plurality of steel wires threaded
the connecting rods 28 and 29 and an actuator rod 19 for
each casting submerged in the caustic material.
Furthermore, applicant has disclosed only one means
for imparting the reciprocal movement to the bar 21 and
rod 19 in order to move the casting 18 relative to the wires
31; however, it is to be understood that other means could
be used to produce this movement without involving the
invention as long as casting 13 moves approximately
parallel to the wires 31.
- From the foregoing description taken in connection with -
the drawings, it will be obvious that a novel apparatus is
provided wherein ceramic cores are removed ‘from an in
vestment casting while immersed in a caustic bath.
Obviously many modi?cations and variations of the
present invention are possible in the light of the above 25
teachings. It is, therefore, to be understood that the in
through said cores and said second means includes a gear
motor operably connected to said castings.
3. A device for removing ceramic cores from an in
vestment casting comprising; a container for a caustic bath,
a plurality of spaced apart wires, said wires and said cast
ing adapted to be immersed in said caustic bath in said
container, means for mounting said casting adjacent said
wires whereby each wire is coaxially threaded within a
core and extends therethrough and means for reciprocat
ing said casting relative to said wires whereby fresh caustic
solution is brought into contact with said cores.
References Cited in the tile of this patent
Carter ______________ __ June 18, 1957
Germany ____________ __ Mar. 26, 1921
vention may be practiced otherwise than as speci?cally de
scribed provided that it falls Within the scope of the ap
pended claims.
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