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Патент USA US3093882

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June 18, 1963
G. A. PAGoNls
METHOD OF' AND APPARATUS FOR FORMING AN
INGOT OF MOLTEN REACTIVE MATERIAL
Filed Sept. 30, 1959
3,093,872
3 Sheets-Sheet l
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INVENTOR
George Il. Pagazzz's
ATTORNEYS
June 18, 1963
G. A. PAGoNls ‘
3,093,872
METHOD oF AND APPARATUS FOR FORMING AN
-
INGoT 0F MOLTEN REACTIVE MATERIAL
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INVENTOR
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ATTORNEYS
June 18, 1963
G. A. PAGoNls
3,093,872
METHOD OF‘ AND APPARATUS FOR FORMING AN
INGOT OF MOLTEN REACTIVE MATERIAL
George il. Pagan/115'
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ATTORNEYS
United States Patent
1
3,093,872
METHOD OF AND APPARATUS FOR FORMING AN
INGOT OF MOLTEN REACTIVE MATERIAL
George A. Pagonis, San Jose, Calif., assignor to Light
Metals Research Laboratory, Inc., San Jose, Calif.
Filed Sept. 30, 1959, Ser. No. 843,533
13 Claims. (Cl. 22--79)
This invention relates generally to an apparatus for
handling a molten material for forming an ingot thereof,
and more specifically to an apparatus for conducting a
high-temperature, molten, reactive material from a point
of treatment to a receiving mold for forming an ingot.
icc
3,093,872
Patented .lune 18, i953
Z
cooled simultaneously with the introduction of a rela
tively cool inert atmosphere into the mold.
It is a further object of the invention to provide a
novel means for selectively heating or cooling an ingot
mold.
It is a further object of the invention to provide a
novel means for positioning an ingot mold in receiving
relationship to a pouring spout and for raising and lower
ing said mold with relation to the end of sai-d spout.
Further, it is an object of the invention to provide
means for temperature control Iof an ingot mold to avoid
thermal shock to the mold and to facilitate the proper
solidification 4of the mol-ten material.
Reference is made to applicant’s earlier applications,
`Other and further 4objects and advantages of this in
Serial No. 505,887, tiled May 4, 1955, for a Process for 15 vention will become more apparent from a consideration
Treating Titanium Metals and now abandoned, and Serial
of the following specification when read in conjunction
No. 775,994, tiled November 24, 1958, for an Appa
with the annexed drawings, in which:
ratus for Treating Titanium and Other Metals, of which
FIG. l is an elevational view showing the relation
the present .application is a continuation-impart and now
ship of the pouring spout or conduit, the ingot mold, the
Patent 3,079,451. These earlier applications relate to a 20 separable valved connection between the conduit and
method of and to an apparatus for producing substan
mold, a mold-receiving and supporting member, and the
tially pure metals and ltheir base alloys in consistent
means for raising and lowering the mold, certain parts
homogeneity through the use of a novel sequence of op
of the cold and mold-receiving member appearing in sec
erations in a novel multistage apparatus wherein the
«tion and the pouring spout being positioned for the be
meta-l is tirst melted yand passed from stage to stage in its 25 ginning of a pouring operation;
molten state. As disclosed in these earlier applications,
FIG. 2 is a plan View of the separable valved connec
the process is carried out by the continuous application
tion;
of inert gas and vacuum in ra novel manner, »the con
FIG. 3 is a sectional View through the separable valved
struction of the apparatus ybeing such as to preclude
connection taken on the Iline 3_3 of FIG. 2„ showing
the entry of the ambient atmosphere at any stage during 30 the valve members in their closed position;
the operation thereof.
FIG. 4 is a plan view of one of the housings of the
While the apparatus of the present invention may be
separable valved connection as viewed on the line 4_4
used for torming an ingot of any conventional metal or
of FIG. l, lshowing the valve member in its open po
alloy, it is particularly useful in the handling of reac
sition;
tive metals, such as titanium ,and other refractory rnet 35
FIG. 5 is a vertical sectional View through the connect
als, which at elevated temperatures have a high aiiinity
ing spout or conduit, separable valved connection and
for the oxygen and nitrogen in the atmosphere.
mold, in one of the mold-iillin-g positions taken on the
In the process as described in the earlier-tiled appli
line 5-5 of FIG. 2; and
cations referred to above, the conditions of vacuum and
FIG. 6 is a View similar to FIG. 5, illustrating the
inert atmosphere are employed throughout the entire 40 valve elements in their closed position and the housings
system, including an ingot mold and connecting spout
of the valved connection separated.
thereto from a orucible containing the molten metal. A
In the description which follows reference will be made,
valve is provided in the connecting spout adjacent the
for purposes of exempliñcation only, to the productionV of
crucible, and this valve normally remains closed except
titanium or titanium alloys in which an inert atmosphere
during the pouring stage when the molten met-al is trans
of helium is employed. lt should be understood, how
ferred `from the Crucible to the ingot mold. In the pour
ever, that the apparatus and method could also be used
ing operation it is important that atmospheric contami
in connection with other metals or refractory materials
nants be completely excluded from contact with the
which are highly reactive at elevated temperatures in their
molt-en metal and ingot until the latter has reached a
molten state as well as with any conventional metal or
nonreactive stage. It is also important that the tempera 50 other molten material, and that other inert gases could be
tures of the ingot mold `and poured ingot be carefully
employed. The references to titanium, titanium alloy, or
controlled, both from the standpoint of prevention of
helium in the Specification, therefore, are not intended as
thermal shock to the mold liner and for obtaining proper
limitations, but are intended to be illustrative of the broad
inventive concepts.
crystal structure in the cooled ingot.
It is .an object of this invention to provide a connec
Referring to the drawings, in which identical parts are
tion between the pouring spout and the ingot mold, which
designated by the same reference characters, the system,
effectively precludes the lentry of ambient atmosphere
as shown in FIG. l, comprises pouring spout C from a
into 4and the loss of the inert atmosphere from the mold
Crucible (not shown), a connecting member CM, a mold
and connecting spout.
M, a mold-receiving member MRM, a platform P, and a
It is a further object of the invention to provide a 60 hydraulic jack HI.
The pouring spout C is connected at its upper end
novel connection between the pouring spout and the mold
through a valve to a Crucible, as shown in the earlier
whereby to retain both the mold and the connecting sp out
filed applications Serial No. 505,887 and Serial No. 775,
in sealed condition when the mold is removed from the
994, from which it receives pure molten titanium or titani
spout after receiving a charge of molten metal.
It is a further object of the invention to provide means 65 um alloy, and the discharge or outlet end, designated by
the reference numeral 10, extends vertically downward.
for the evacuation of contaminating gases from the mold
The
spout C includes an outer tubular shell l2, an inner
and spout and for the supply of an inert atmosphere
lining 14, and an intermediate lining 16. The shell 12
thereto.
is formed of steel, while the linings i4 and 16 are formed
It is a further object of the invention to provide a 70 of a suitable refractory material capable of withstanding
novel separable valved connection between a connecting
the high temperatures encountered.
conduit and a rnold wherein the valve elements may tbe
As shown in FÍGS. 3, 5 and 6, the intermediate lining
3,093,872
l
3
.
16 is slightly shorter than the inner lining 14 and the
shell 12, and is held in place by the upper end of a ring
20 of a stop collar 18. The ring 28 is externally threaded
4
As seen in FIGS. 4 and 5, portions of the ribs 58 and
76 are cut away at 96, to receive cam locks 98. Each cam
lock 98 comprises a short cylindrical member which is
to matingly engage internal threads on the lower end of
eccentrically mounted on one end of a shaft 100 extend
‘the shell 12. The lower end of stop collar 18 is pro
vided with an internal flange 22 adapted to be received
within a rabbet 24 in the lower end of the inner lining 14.
The connecting member CM comprises a two-part valve
assembly 26 including an upper valve housing 28 `and a
ing through the side flanges 40 and 72 of the upper and
lower valve housing 28 and 30, respectively, the openings
being sealed by means of packing glands 102. The outer
ternal diameter to provide a working llt about the outer
adapted to extend into these recesses so that when the
ends of the shafts 10i) are equipped with operating cranks
104 by means of which the eccentrically mounted cam
lower valve housing 3ft.
>
10 locks 98 can be oscillated. Springs 106 surround the shaft
and act on the cranks 104 and the packing glands 102
The .upper valve housing 28, as shown in FIGS. 2, 3, 5
to urge the shafts 100 outwardly. The cam locks 98
and 6, is rectangular in form, having a flat upper surface
have a diameter equal to the width of the channels 56 and
including a hollow upstanding boss 32, having a bore 33,
881 in the valve elements 54 and 78, respectively, and are
adjacent one end. The bore 33 in the boss has an in
surface of the shell 12, and includes a pair of spaced an
cranks 104 are oscillated from the .postion shown in solid
nulargrooves for sealing rings 34 adapted to prevent leak
lines in FIG. l to the position shown in dotted lines, the
age of gases between the boss and the pouring spout C.
cam locks 98, due to their eccentric mounting on the shafts
100, urge the valve elements 54 and 78 tightly against
their valve seats 50 and 92, respectively.
The lower edges of the flanges 40 and 42 of the upper
The lower end of the bore 33 is rabbeted at 36 to receive
an external flange 38 on the lower end of stop collar
18, as shown in FIGS. 3 and 6, to limit the downward
‘sliding movement of the upper valve housing 28 on the
outlet end 16 of the pouring spout C. The end of the
valve housing 28 adjacent the boss 32 (to the left as
viewed in FIGS. 5 and 6), includes a downwardly directe
flange 42, and each side is provided with downwardly
directed flanges 48, the ilanges 40 and 42 being inter
valve housing 2‘8 and the upper housing plate 46, and the
upper edges of the flanges 72 and 74 of the lower valve
housing 30 and the lower housing plate 66, „are each
provided with a continuous channel 103. The channels
168 in the upper and lower valve housings 28 and 30
and in the upper and lower housing plates 46 and '66,
are aligned, and adapted to receive an O-ring 110, which
tightly ñts within the grooves 108 to provide a fluid tight
The flanges 40 and 42 form side walls and an end wall 30 seal when the housing parts are brought together as shown
in FIGS. 3 and 5.
of the Valve housing, the other end Wall being formed by
The upper surface of the upper valve housing 28,
an upper housing plate 46 attached to the flange 44- by
near the end flange 44, is bored to receive a pipe ñtting
means of a plurality of cap screws 48 passing through
114, to which a flexible supply conduit 112, having a
aligned holes in the plate 46 and flange 44, and holes in
a Teilon gasket 45 positioned between the ilange and 35 valve 113 (FIG. 2), is connected.
Referring to FIGS. l, 3, 5 and 6, the mold M com
plate. The lower surface of the housing 28, in the area
prises a cup-shaped outer shell 1,16 of steel, which is
surrounding the bore 33, is ñnished ofi smoothly to pro
lined with a refractory lining 118, extending to a point
vide a valve seat Si), and is recessed to receive an O-ring
short of the upper end of the shell, where it contacts the
52.
A valve element 54 is slidably mounted within the 40 lower end of the boss 60. Refractory lining 118, in the
operation of the process on titanium metal or alloy, may
upper valve housing 28, the sides and one end of the
be formed by heavily spraying the interior face of shell
valve element having channels 56 adapted to engage longi
'116 with a fine refractory material comprising from about
tudinally extending ribs 58 on the side and end flanges
75-90% 1h02, 6-10% HfOz, 3-7% ZrO2 and 1-3%
48 and 42, which form guide means for the valve element.
connected and their lower edges being even, The other
end of the housing 28 is turned up to form a flange 44.
The lower valve housing 3@ is generally rectangular in
form, and includes, adjacent an end thereof, a down
wardly extending boss 60, having a bore 62 therethrough.
The other end of the housing has a downwardly extend
ing ilange 64, which is adapted for connection with a
housing plate 66, by means of plurality cap screws 70,
which pass through aligned threaded holes in the end
flange, the housing plate, and a gasket `68 of Teilon dis
‘[203. The upper end of the shell is flanged at 120, and
the lower surface of the lower valve housing 30 is
grooved to receive an O-ring 12,2 to form a seal between
the valve housing and the flange 120.
‘Locking means are provided for selectively securing
valve housings 28 and 30 together and to the shell 1116
of the mold. Thus, flange 120 is provided with four
circumferentially spaced threaded bores to receive the
posed between the flange and the housing plate. The
valve housing 30 is provided with a pair of parallel side
lower ends of threaded stud bolts 124. Lock nuts .126
Cludes a groove to receive an O-ring 94.
vicinity of the pouring spout.
are tightly screwed about the bolts against the flange
flanges 72 and an end flange 74 (FIG. 4), which flanges 55 120 to prevent unscrewing of the stud bolts. Each stud
bolt carries, in vertically spaced relation, a lower clamp
are Icontinuous .With the upper edge or” the housing plate
ing lever 128, held in proper position by upper and lower
66 to form four side walls of the valve housing, having
lock nuts 130, and an upper clamping lever 132, held in
an `open top for receiving a sliding valve element 78.
place by a lower lock nut I134 and an upper wing nut
The side and end flanges 72 and 74 have longitudinally
extending ribs 76, which engage in longitudinally extend 60 §36. These levers are adapted to be swung into position
over the upper edges of the flanged sides andthe ends
ing side and end channels 80 (FIG. 3) in the valve ele
of the valve housings 28 and "30, as shown in FIGS. l
ment 78 to form a guiding means for the valve element.
and 5, to clamp the valve housings and the mold in fluid
An operating rod 82 is connected to the outer end of the
-tight relation.
valve element 78. This operating rod extends through an
As shown in FIGS. 2, 3 and 4, the lower valve housing
opening and a packing gland 84 in the lower housing 65
36 includes a pair of opposed passages i138 and 140,
plate 66, and is provided on its outer end with a handle
which enter the side flanges 72 in a horizontal direction
86 (FIG. l) by means of which the valve elements may
and extend downward in an oblique direction through
be operated. The upper surface of the valve element 78
the boss 62, terminating in the lower end of the boss as
includes .a plurality of spaced, upwardly extending, dowels
88, which are adapted to engage an equal number of 70 shown in FIG. 3. The passages 138 and 140 are provided
with fittings 141 and 142 to which flexible conduits 143
aligned recesses 90 in the lower surface of the upper
valve element 54. The upper surface of the valve housing
and 144, having valves 145 and 145a, are connected.
These conduits may be readily disconnected so that the
30 surrounding the bore 62 is finished oil smoothly to
mold and lower housing 30 can be removed from the
provide a valve seat 92 for the valve element '78, and in
3,093,872
l
e)
Referring to FIG. l, the mold M is adapted to be re
movingly litted within a mold receiving member MRM.
This mold receiving member comprises a cup~shaped ele
ment 146 of refractory material, in which is embedded
a continuous copper tubular element 148 disposed adja
cent the inner wall of the member 146. The copper
tubular element 148 includes an inlet 150 and an outlet
i152, extending outside the cup-shaped element 146, the
Such preheating continues until the mold and the lining
reach the desired temperature.
The valve in the pouring spout C, adjacent the Crucible
mentioned above and disclosed in application Serial No.
505,887, may then be opened to permit the discharge of
the molten titanium or titanium alloy from the crucible,
at a controlled discharge rate.
When the valve in the pouring spout C is opened, the
molten material, which in the case of titanium metal
inlet 150 being adapted to be connected through a ñexible
may be at a temperature in the order of 30010o `F., flows
hose (not shown) with a source of cooling iiuid, which
into the mold by force of gravity. `Because of the pre
passes through a tubular element 148 and discharges :from
the outlet 152. A pair of electrical conductors 154 are
heated condition of the mold and the position of the
connected to the inlet and outlet '158 and 152, respec
outlet end 10 of the pouring spout C in close proximity
tively. These conductors are adapted to be connected
`to the bottom of the mold, the material flows into the
to a source of high frequency, alternating current for 15 mold without splashing and substantially without thermal
induction heating for a purpose to be described herein
shock. rlïhe heating of the mold by means of the tubular
after.
element 148, as described above, continues during the
The mold receiving member MRM is carried by a plat
initial rfilling of the mold. Filling of the mold proceeds
form P, comprising a base 156 provided with centering
until a pool is collected at the bottom of the mold, where
means 158 to receive the lower end of the cup-shaped 20 upon the fluid is admitted to the upper end and discharged
element E146, in order to properly align the mold and the
from the lower end of the hydraulic jack Hl' to lower
upper and lower housings 23 and 30 during assembly
the mold relative to the discharge end 10 of the connecting
for a pouring operation as described below. The plat~
conduit. The rate of lowering of the mold can be regu
form P is supported by a hydraulic jack HI, comprising
lated by any known means. When the mold M contains
a cylinder 16d, a reciprocating piston 162, and a piston 25 a substantial amount of the molten material, for example,
rod 164 connected to the base 156 of the platform. The
when it is one-uarter to one-half full, heating by lthe
cylinder 168 includes upper and lower iluid connections
tubular element 148 is discontinued and cooling of the
A166 to receive and exhaust pressure fluid for raising and
mold and molten material can be initiated by circulat
lowering the platform and the mold M supported thereon.
ing a cooling liuid, such as air or liquid, through the
The operation is as follows:
30 tubular element 14S to bring about uniform solidifica
It may -first be assumed that it is desired to íill the
tion. As vfilling of 4the mold continues, the mold M and
mold M with molten material from the crucible, not
the connecting member CM are lowered until the outer
shown, by way of the pouring spout C. The clamps 128
ilange 38 of the stop collar 18 engages the rabbet 36 in
and 132 are set, as shown in FIG. l, to securely fasten
the lower end of boss 32, which is effective to limit the
the connecting member CM to the mold and the valve 35 downward movement of the mold ‘and the connecting
housings 28 and 38 together. The valve elements 54
member. The molten material in the mold is preferably
and 78 are moved to their open position, as shown in
kept under a constant inert gas pressure until it has solidi
FIG. 5, by pulling the handle 86 outwardly until the
fied and cooled. In the case of titanium, inert gas pres
outer ends of the valve elements are stopped by striking
the housing plates 46 and 66. The dowels 88 in the lower 40 sure should be maintained until a temperature 800° F.
has been reached.
valve elements 78 are in engagement with the recesses 98
If desired, -the valve 145g -in the conduit 144- which is
in the upper valve element 54, so that the two valves are
connected with the source of vacuum can be closed dur
compelled to move together. When the valves are in
ing pouring, or the valve can be partially closed so that
their open position, as shown in FIG. 5, the mold `M
and platform P are raised by admitting pressure fluid to 45 there is a continuous supply of linert gas by way of the
conduit 112 and conduit 144 which is at a rate sufficient
the space below the piston 162 and exhausting fluid from
-to maintain the desired pressure within the parts. This
the space above the piston. As the pouring spout C is
mode of operation has the advantage of permitting the
fixed against movement, and in view of the sliding con
relatively cool supply of »insert gas admitted by conduit
nection between the boss 32 on the upper valve housing
112 to pass over and about the valve elements 54 and
28 and the outlet end 10 of the connecting conduit C,
78, and about the cam locks 98, to protect them from
the mold M and the connecting member CM are moved
the high temperature of the molten material. Prefer
upwardly relative to the outlet end 1t) of the spout C
ably, the pressure is kept slightly above atmospheric
until the lower or outlet end 16 is disposed slightly above
and is maintained at a constant value during the pouring.
the bottom of the mold in the position shown in HG. l.
When the mold M is filled, the' valve in the pouring
Flexible conduit I144 is connected with an exhaust pump 55
spout
C at the Crucible may be closed, and the valve ele
or other source of Vacuum, while the other conduit 1435`
ments 54 and 76 may be moved toward their closed posi
is connected with a supply of inert gas under pressure,
tion by pushing on the handle 86 until the nibs 58 and 76
such as helium, for example. At the same time the con
engage the channels 56 yand 80 in the ends of the sliding
duit i112 to valve housing 26 is connected with the com
valve members. The cranks 104 may then be oscillated
mon supply of inert gas. After the mold and valve as~ 60 from the position shown in solid lines in FIG. 2 to
sembly have been evacuated through line 144», valve
145a being open, inert gas is admitted to the valve hous
ings and mold by opening valves 113 and 145. As a result
of this operation, the interior of the mold, the interior of
the position shown in dotted lines, which oscillates the
eccentrically mounted cam locks 98 to forcibly urge the
valve members 54 and 78 against their valve seats 50` and
92, respectively, providing a fluid tight seal between the
the pouring spout C, and the interior of the connecting 65 valve elements and the discharge end 10 of the pouring
member CM, are flushed of contaminating gases and are
spout on one hand, and the open top of the mold M on the
iilled with an inert atmosphere of helium at a relatively
other hand, and at the same time locking the valve elelow gage pressure, which assures the continued exclusion
ments against inadvertent opening movement. The mold
of any other gas that may react with the molten mate 70 M may then be removed by separating the valve housings
rial to be delivered into the mold.
28 and 30 so that the upper Áhousing 28 remains with the
Meanwhile, the mold M is inductively preheated to a
pouring spout C and the lower housing 3d is removed
temperature in the neighborhood of 1260*’ lto l300° F.
with the mold. To facilitate such separation, the wing
by passing a high frequency alternating current through
nuts 136 may be loosened or removed, which enable
the tubular element 148 by means of the conductors 154. 75 the upper clamping levers 132 to be swung out of the
@,osasve
8
«way of the upper housing 23, or removed, as shown in
said discharge opening and the lower valve housing being
FIG. 6. The valves 113, 145 and 145e are closed, and
adapted to remain with the mold with its valve closing
said open top.
the piston 162 in the hydraulic jack HJ may then be
lowered, whereby the upper and lower valve housings
2. The apparatus of claim l including means to move
>28 and 30 are separated, as shown in FIG. 6. "ihe mold 5 the mold and associated valve housings axially relative
to said conduit to vary the distance between the discharge
M may be removed -and when the ingot has reached a
opening of said conduit yand the bottom of said mold.
temperature below reactive temperature, lower valve
3. The apparatus of claim 1 including a member for
`housing 39 can be removed for placement on another
receiving said mold, said member including a tubular
mold for repeated operation. lf desired, a number oi
lower valve housings can be provided to speed up the 10 element in heat exchange relation to said mold, and
process.
The mold may be left Within the mold receiv»
`ing member MRM for any desired length of time, where
it may be cooled at a selected rate by the external cool
means to supply a heat exchange Huid to said tubular
element.
4. The apparatus of claim 3 in which said tubular ele
ment is of electrically-conductive material, »and means
and controlled cooling rate beneiicially iniiuence proper 15 for `connecting Asaid `tubular element to a source of high
ing means.
Both the presence of inert gas under pressure
>.crystal structure in the product ingot.
frequency alternating current.
5. The apparatus of claim l including means to supply
»an inert atmosphere within said mold and to withdraw
gases lfrom said mold.
-on the platform P, and the hydraulic jack Hl is operated
6. The apparatus of cla-im 5 in which the supply means
to raise the platform. The centering means 158 assures 20
for inert atmosphere includes a passageway through one
‘that the mold is properly aligned with the connecting
of said valve housings.
yconduit C, and the valve elements 54 and ’73, being locked
7. The apparatus of claim il including cooperating
-by means of the cam locks 98, assure that the dowels
means carried by said conduit and said upper valve
’S8 enter the recesses 90 land that the housings ZS and
Vit) are brought together in proper relationship so that the 25 housing to limit relative sliding movement of said hou-sing
with respect to said `conduit so as to prevent removal of
O-ring 21.10` is properly received within the grooves 108
said upper »valve housing from said conduit.
`in the upper and lower housings. When the parts are
8. The apparatus of claim 7 wherein said means carried
lso brought together, the clamping levers 132 may then
by said conduit >and upper valve housing to lim-it rela
again be brought to bear against the upper surface of
»the upper housing 28 and tightened by means of the 30 tive sliding movement of said housing with respect to said
conduit comprise a flange on said conduit adjacent said
.Wing nuts 136. The valves in the conduits 112, 142 and
discharge opening and a shoulder vvithin the bore of said
144 may then be opened, and the valve members 54 and
upper valve housing above its associated valve member
70 opened by drawing on the handle 86, as described
for engagement with said iiange.
iabove.
35
9. The apparatus of claim l «wherein each valve hous~
It will be understood that various changes may be
ing includes a valve sea-t, said valve members are slidable
made in details of construction yand in the arrangement
over their respective seats and said valve housings each
yof parts of the system disclosed herein without depart
Y
include
locking means lfor forceably urging their respec
'ing from the principles of the invention and the scope of
tive valve members against their respective seats to seal
the annexed claims. For example, the ingot mold may
end of the conduit and the mold, respectively after a
itself be provided with a suitable temperature control 40 the
casting
operation.
>means, and other modifications generally as described
’10. The apparatus of claim 9 including means within
When it is desired to form »another ingot, the mold
M and the mold receiving member MRM are mounted
Yand shown in copending application Serial No. 505,887
may be employed.
said valve housings interconnecting said valve members
for concurrent transverse sliding movement over their
I claim:
45 respective seats, said interconnecting means being separa~
l. An apparatus `for casting an ingot of molten mate
ble upon movement of said valve members in a direc
rial, comprising: an ingot mold having an open top; a
tion normal to said transverse sliding movement.
downwardly-directed conduit for delivering said molten
’11. A separable valve assembly `for, providing »a gas
material into said mold, said conduit having a discharge _ tight connection between a supply conduit and a mold
opening at its iower end and being receivable through 00 during a casting operation, comprising: an upper valve
the open .top of said mold to position said discharge
housing having `a bore adapted to receive said supply
`opening within the mold; a connecting member connect
conduit, the upper portion of said bore being of reduced
»ing said mold and conduit in gas~tight relation, sald con
diameter to provide a close sliding tit with the outer pe
uecting member comprising an upper valve housing hav
riphery of said conduit and having sealing means adapt
,ing a bore slidably receiving -said conduit; se-aling means 55 ed to provide a gas-tight but slidable connection with said
providing `a gas-tight sliding ñt between said bore and the
supply conduit; a lower valve housing having a gas-tight
Vouter periphery of said conduit; a lower valve housing hav
but separable connect-ion with said upper valve housing
ing a gas-tight but separable connection with said upper
and having a bore registering with the bore of said upper
valve housing and having a bore registering with the bore
valve housing and also adapted to receive said supply
of the upper vaive housing and also adapted to receive 60 conduit, said lower valve housing being adapted to be
:said conduit, said lower valve housing being tixed to said
secured in fixed gas~tight relation to the top of said mold;
mold; a pair of slide valve members, one slide valve
a pair of slide valve members, one of said valve members
member being carried by each valve housing and each
being carried by each val-ve housing and each valve mem
valve member being movable between open and closed
ber being movable between open and closed positions
positions opening and closing the bore of its respective
opening and closing the bore of its respective housing;
housing; means for moving said valve members between
each valve housing having a valve seat receiving its re
said open and closed positions; said ingot mold and valve
spect-ive valve member in said closed position; means for
khousings being movable axially with respect to said con
moving said valve members :between said open and closed
duit lto position said discharge opening at selected dis
tances trom the bottom of the mold during a mold-tilling 70 positions; means carried by each valve housing to force
ably urge yand lock each valve member against its seat,
operation and within the upper valve housing above said
said valve housings being separable together with their re
valve members at the end of -a mold-ñl-ling operation, said
val-ve housings being separable together with their respec
tive valve members, the upper valve housing being adapt
spective valve members with the upper valve ‘housing be
ing adapted to remain with said supply conduit with its
ed to remain with said CGnduit with its valve closing 75 valve closing the end thereof and the lower valve housing
3,093,872
gage a recess in the other valve member.
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