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Патент USA US2412040

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Dec. 3, 1946.
Filed June 23, 1942
2 SheetAS-Sheet 1
('arl (fall
By ?an/f I Bwr?a
Patented Dec. 3, 1946
Carl Gall and Frank J. Prucha, Omaha, Neb'rs'
assignors to American Smelting and Re?ning
Company, New York, ‘N. Y-., a corporation of
New Jersey
Application June 23, 1942, Serial No. 448,054
5 Claims. (01. 22"—‘-77)
This invention relates to casting apparatus and
more particularly to a machine for casting metal
slugs as, for example, lead slugs.
According to a preferred manner of practicing
the invention, the apparatus comprises a turnta (it
ble' rotatable about a vertical axis and having a
broken away to give room for making the draw;
ing on a larger scale;
Fig. 2 is a vertical section on the line 2-2 of
Fig. 3 is a vertical section through an individual
mold taken on the line 3—3 of Fig. 1; and
Fig. 4 is a transverse section through the mold
taken on the line #4 of Fig. 3.
Like reference characters denote like parts in
series of molds disposed along the edge of the
turntable. A series of stations surrounds the
turntable at which, as the turntable rotates, the
the several figures of the drawings.
various operations are performed on the molds. 10
In the following description and in the claims,
The ‘molds comprise an inner mold space and an
various details will be identified by speci?c names
outer jacket space to which water-supply con
for convenience, but they are intended to be as
duits are connected. A water-supply tank ro
generic in their application as the art will permit.
tates with the turntable and controls the water
Referring now to the drawings, the turntable 9
supply to the several water-supply conduits as
is shown mounted upon a foundation to which
the turntable revolves. The several IIlOldS are
may be of usual concrete construction. Resting
mounted in such manner that as the turntable
upon the foundation is a discharge basin l3 and
revolves, they are tipped from upright to sube
a plurality of annularly arranged supports l2
stantially inverted position to discharge the cast
upon which rests an annular catch pan l I for the
billets and back again to upright position to re
purpose of catching over?ow from the water jack
ceive molten metal.
ets of the molds 60. Water ?ows ‘from catch ‘pan
According to the preferred embodiment of the
I i into discharge basin I3 to which drain pipe [4
invention, the cooling water is applied to the
is connected. The foundation also supports a dis‘
jacket and the freezing of the molten metal is
charge chute 85 for receiving the cast slugs 86
controlled'in such a way that the metal freezes 25 at the discharge station as will hereinafter more
from the bottom up, thereby preventing forma
tion of internal cavities and draw holes due to
shrinkage. The mold. is ?lled with molten metal
while the water jacket is empty, after which the
water jacket is gradually ?lled. After ?lling
with molten metal, the molds move under station
ary gas burners which apply heat to the top of
the molds thus delaying freezing of the tops of
the molds until last. The turntable continues to
rotate and the molds continue to travel to a point
approaching the starting position where the molds
are tipped to drain the water and then to dump
fully appear.
Resting upon the foundation [0 is a hollow base
l5 having suitable anchors l6 embedded in the
concrete foundation [0.- Bolted to the base I5 is
a casing l'l having a lower section l8 and an
upper section l9 suitably bolted together. The
lower section 18 has an annular seat for an
axial thrust bearing 23. Journalled at 20 in the
lower section it! is the mast- 25 having keyed
thereto a worm wheel 2| engaging thrust bear
ing 23. Worm wheel 2| has a hub 24 journalled
in upper section l9.
At the top of the machine is an overhead struci
the slugs from the mold, after which the machine
rights the mold as it approaches the starting point 40 ture indicated by 21 which may be secured to
the beams of the ceiling‘ of the room in which
where it is again ?lled with molten metal for the
the casting machine is housed.» Secured to the
next cycle of operation.
The invention also consists in certain new and
overhead structure 21 is a bearing 26 in which the
upper end of mast 25 is rotatably mounted. Sui-ti
original features of construction and combina
tions of parts hereinafter set forth and claimed. 45 ably journalled in casing H is a worm 28 which
Although the novel features which are believed
meshes with and drives‘ worm wheel 2|. Worm
28 is suitablyi driven by belt or chain 30 from
to be characteristic of this invention will be par
ticularly pointed out in the claims appended here
to, the invention itself, as to its objects and ad
suitable source of power? such as an electric mo
vantages, and the‘ manner in which it may be 50
to'r, not shown‘.
carried out, may be better understood by referring
to the following description taken in connection
with the accompanying drawings forming a part
thereof, in which
Fig.» '1 is a plan view of the machine with part
in pairs. These‘ ‘teams 34 are bent at their
outer ends to‘ de?ne parallel- paths and the adjoins
a speed reducer 29 which may be driven by any
The platform of the turntable 9 comprises a
hub plate 33 secured to hub 24
to which
are secured a series of radial beams 34 arranged
ing beams of each pair are connected together
throughout their lengths in any suitable way and
at their spaced ends by connecting pieces or
plates 31. The radial beams 34 of each pair
lating and temperature withstanding material
such as asbestos.
The several molds 60 are mounted upon the
turntable 9 in the following manner. Each mold
near their inner ends are connected by struc
has secured thereto studs 15 forming trunnions.
tural pieces 3|. The parallel ends of the beams
34 support the individual molds 60 ina man
ner hereinafter v"described more in detail.‘ The
outer edge of the platform 9 is supported by a
plurality of hang rods 35. These hang rods, one
for each connection piece 31, pass through their
These trunnions are secured at a point above the
center of gravity of the mold so that the mold
respective connecting pieces3'l and through the
mast collar 38. The ends of the hang rods have
tends normally to take an upright position. Se
cured to the trunnions are rollers or wheels 16
and gears 11. The rollers 16 roll on the parallel
tracks 18 on the ends of beams 34 and take the
weight of the molds. The pinions TI engage the
H racks 19 on the ends of beams 34, the sides of
the racks ‘I9 acting as side guide-ways for the
suitable washers and nuts: for ,impartingthe
hanging stress to the connecting ‘pieces 31and 15 rollers 16 to keep them in their paths.
to the mast collar 36 and for adjusting purposes. -
Pivoted to the ends of the trunnions 15 are
Secured to the casing I‘! is a trough-shape cam
links 80 which converge to form parallel‘ ends
track 38 in which is mounted ‘a ‘plurality of" ' " 82 secured together in a suitable manner. Pivot
rollers 39 mounted upon levers 48 pivoted to the
connection 8| connects ends 82 and the lever
connecting pieces 3| by pivots 32. There is one 20 40. Thus, it will be seen that, as the turntable
lever._~40 ,for each mold. Thecam path ,38_,has
9 rotates, the stationary cam path 38, actingupon
roller followers 39, exerts a pull on-the- trun
an irregular shape as indicated particularly in
Fig. l for the purpose of controlling theyposi
tion of the molds with respect to the platform
of; they turntable as will be explained hereinafter.
For supplying ‘water to the several; molds, a
waterhead tank 43 is secured toythe m‘astg25 by
their ?at straight paths ‘18. The pull of links
tains the levelof the water in tank 43 at apre
determined point as will be understood by. those
ing position, as shown at the right of Fig. 2.v 7
nions 15 which moves the trunnions radially of
the turntable causing the wheels .16 to, roll upon
80 not only imparts a translational movementto
the mold but, due to the rack-and pinionsw‘lj,
suitable supportingdevices indicated. by“. , The
19, also imparts a rotary movement to the molds,
tank 43 has a stationary supply pipe 44 having
causing them to move from upright positionh-as
a valve 46 controlled. by a?oat 45. .This main 30 shown, ‘for example, at the left of Fig.,,2, to dump
skilled in the
,The tank 43 has a plurality of outlet pipes 48,
one. for each‘mold.
These outlet pipes 48 may 35
have .hand valves 52 whereby the water may be
ably supported adjacentythe turntable and are
regulated. :or'shut off for emergency or repair
purposes. Ordinarily the valves 52 are open.
Connected to each pipe 48 is a?exible hose ‘H
connected to the water jacket of the mold. 60.
a For‘. controlling water supply through the sev
are indicated by the letters A to J which are'called
stations. It is preferable that the turntable‘ro
tate step by step, intermittently, va distance equal
the distance between two adjourning stations;
49 controlled by. a lever 50 having‘ a roller. 56.
These levers 5B are'normally resiliently held in
outer position by a series of springs 5| secured
to a ring 41 suitably supported bytheltank 43.
The position of the levers 50 is determined by a
valves ' 49 are open when the levers 50 ‘are in
their outer position but, as the turntable revolves,
the rollers 58 engage the cam track 54 to shut off
the water supply to the ‘several molds as they
approacnthe dumping and pouring positions in
their cyclefof
Referring now-to Figs. 3 and v4, the mold itself,
indicated by 60, may be of suitable‘sheet or plate
metal parts suitably welded together, as indi
cated. The mold comprises an inner shell 6|
having a bottom wall 63-forming a. mold space
62. An intermediate wall 65 is' connected to bot
tom wall 53.‘ The top wall‘ 61 is connected to
walls 6| and B5 and hassecured thereto an outer
wall 64. Walls 6| and 65’form a water jacket
for the purpose of applying heatto the tops oi
the molds and their contents of molten metal for
the purpose hereinafter described m'orein detail.
For convenience, the various positions which
each mold 60 may take as the turntable 3 rotates
eral pipes 48, eachpipe is provided with a valve
stationary cam path 54, having the shape illus
trated particularly in Fig. 1, suitably secured to
the upper structure 21 by members 55. The water
At certain points along the periphery oi’ the
turntable stationary gas ‘burners 83 are provided.
In the present case, these burners are suspended
from a suitable stationary‘supply pipe 84 suit
The molds are all identical and the‘ motor‘ drive
maybe controlled manually‘ to give .tl'ies'tep-byév
step movement, or suitable 'automatic'control, not
shown, may be provided fOr'thlS purpose.“
v "
The position A is the pouring position. The
mold '60 is upright at this point and will be sult
ably ?lledv with molten 'metal froma pouring
spout or ladle, not shown, The discharge posi
tion is'indicated'by H. The turntable rotates'ln
the direction indicated by the arrow X. ‘It will be
noted that the cam path 38 is so shaped‘ that the
molds are'upright at most of the stations and
thus-the molds begin to tip as they leave station
F, being substantially horizontal at station 'G' and
totally tipped to inclined position'at discharge
station I-I,*again substantially horizontal at'sta
tion I and entirely upright at station J.‘ .
Y It will also be noted that the {cam path: 54 is
space ?liwhich is supplied by inlet ?tting 18
secured to the flexible supply pipe ‘H.
so shaped that water is being supplied to the
molds for overhalf of the entirev rotary cycle'
of the'turntable. The water'begins to be turned
oil.’ at station D and is all .the way on‘ at station F.
- v'I'he water. jacket‘xBS has anoverflow opening
The wateris kept turned off through stations G,
12.,cut‘ in the wall 65, which communicates with
the over?ow space between walls 64 and 65.
Secured to the inner shell BI is a massive heat
H, LJ and A and is turned on as the molds leave
A, being of
on at in
B cycle
and C.
is as
retaining ring 68, preferably of a good heat-con
follows. This will .be given for one mold, ltbeing
ducting, heat-holding material suchas copper
understood that identical treatment is accorded
Disposed between the ring 68 and ‘the water jacket
all of the molds:
j ‘I no. '1
is a heatrinsulating gasket 63 of good heat insue 75 ,The upright mold will be fllled._with..molt‘en
'metal such as lead atstation A with its water
jacket‘ empty, having been previously emptied
from the previous cycle. As‘ the mold leaves sta
tion A, lever 50 rides off theend of cam. 54 open
ing water valve 49 causing the water to flowand
begin to ?ll the water jacket. The mold then
passes under the ?rst gas burner .83 at station B.
may be of such size as to produce metal slugs
of approximately ?ve inches in diameter and13
inches in length.- The diameter of‘the turntable
may be about‘ ten feet and may vhold twenty
molds. - The machine is ‘especially .adapted‘rto
casting ‘lead slugs of re?ned lead, antimon'ial
lead, lead allo-yed'withvtin, etc; In: fact, its-use
is‘ most adaptable to all low melting point metals‘.
The water jacket continues tor?ll at a rate deter
- ‘While certain novel features of the invention
mined by the rate at which water is supplied.
'I'he'relative rate of supplying cooling water and 10 have been disclosed and are pointed out in-the
annexed claims, it will be understood that vari-'
the speed imparted to .the tumtable determines
ous omissions, substitutions and changes may be
thestation at which the water jacket becomes
made by those skilled in the art without depart-.
completely ?lled with water. The rate of water
flow may be regulated by hand valves 52. Since
the mold continues to be heated by the four gas
burners 83 at the four stations B, and since it
is desired to utilize the heat retaining ring 68 to
ing from the spirit'of the invention.
What is claimed is:
. I
. 1
1. A casting machine comprising a turntable,
means for mounting said turntable to revolve
about‘ a’ vertical‘axis, a plurality ofroyllndri‘cal
keep the top of the mold hot, it is preferred that
molds disposed around the margin of--'said- turn‘
the‘ water. jacket not become completely ?lled
until it reaches some station of the C group, pref 20 table, supporting devices for said molds, each
supporting device comprising spaced racks on
erably the ?rst station of .the C group.
turntable, rollways alongside said racks, stud
As the mold passes from the last station B to
shafts secured to said mold, pinions secured to
the ?rst of the eight positions C, it leaves the
said stud shafts and meshing with said racks,
gas burners and continues to be cooled by water
wheels secured to said stud shafts and disposed
circulated through the Water jacket 66, the water
on said rollways, links pivoted to said stud shafts,
over?owing through outlet 12, running down
a lever pivoted to said turntable and connected
through annular space between sleeves 64 and 65,
to said links, a stationary camway, a follower’
discharging into the catch pan II. The molten
on said lever disposed in said camway, whereby
metal becomes completely solidi?ed at station D
as said turntable revolves, said camway rotates
or E. At position D, the water-control lever 50
said pinions on said racks to rotate the molds
engages the ?ared end of cam 54 and gradually
from upright to substantially inverted positions.
closes the Water valve 49 through station E until
2. A casting machine comprising a carrier,
at station F the water valve is completely closed.
means for moving said carrier, a plurality of
As the mold advances from station F, the cam
path 38 causes the mold to start to tip to hori 35 molds disposed on said carrier, supporting de
vices for said molds, each supporting device com
zontal position, as shown at position G, where the
prising spaced racks, rollways alongside said
water drains from the jacket into the catch pan
racks, stud shafts secured to said mold, pinions
l3; the mold continues to tip until it reaches
discharge station H, where it is completely tipped,
and discharges the solidi?ed slug, indicated by
secured to said stud shafts and meshing with
said racks, wheels secured to said stud shafts and
86 in Fig. 2, into the discharge chute 85. After
discharging the slug, the mold is tipped back to
horizontal position at station I and thence to
vertical upright position at station J, ready to
be ?lled again as it approaches the mold ?lling
position A.
Thus, a method of casting is provided which
disposed on said rollways, a stationary camway,
a follower connected to said stud shafts and dis
posed in said camway, whereby as said carrier
moves, said camway rotates said pinions on said
racks to rotate the molds from one position to
controls the cooling of the molten metal in the
mold so that the metal is cooled from the bottom
secured to said foundation, a bearing secured to
said base, an overhead structure having a bear
ing, a turntable comprising a mast journalled in
said bearing, a mast support secured to said mast,
up. The retardation of the supply of cooling
water to the top of the mold, the use of external
heat by the gas burners, the use of the massive
heat-retaining rings, all insure keeping the metal
at the top of the mold molten so that this top
metal is the last to freeze. Thus, external vcold
shots, internal cavities, draw holes due to shrink
3. In a casting machine, a foundation, a base
means for driving said mast, a platform secured
to said mast, hang rods connecting said mast
support and the outer margin of said platform,
a plurality of molds supported on the outer mar
gin of said platform, a water tank supported by
said turntable, conduits connecting said water
tank and said molds, each conduit having a valve
age, etc., are prevented. The fact that the water
jacket is empty at the time of pouring and is
and a control lever, a stationary camway guid
gradually ?lled up with water, allows the metal
to chill from the bottom up. This permits the 60 ing said control levers to admit water to and shut
water off from said molds, second control levers,
molten surface of the metal to settle down evenly
connections between said second levers and said
while cooling and prevents cavities and draw
molds, and a second camway guiding said second
downs. Thus, a perfect slug is produced free of
levers to vary the positions of said molds as the
external cold shots, internal flaws and draw
downs and is ?at on the top.
4. In a casting machine, a foundation, a base
The machine is simple in construction and op
secured to said foundation, a bearing secured to
eration. It puts each mold through a predeter
said base, a mast journalled in said bearing, a
mined, mechanically controlled cycle insuring
collar secured to said mast, an overhead struc
equal treatment to each mold. This insures car
rying out the above described process of pouring, 70 ture having a bearing supporting said mast, a
worm wheel having a hub secured to said mast,
cooling and dumping in proper predetermined se
a worm meshing said worm wheel, means for
quence and giving proper treatment at each step.
driving said worm, a turntable comprising a plate
It will be understood that the details and dimen
secured to said hub, pairs of spaced, substan
sions may be varied by those skilled in the art.
In the form shown the internal mold cavities 75 tially radial beams secured to said plate, con
nectingpieces connecting the outer ends of ad
Journing beams, hang rods connecting said mast
collar. and said connecting pieces, a plurality of
V molds-supported along the outer margin of said
mold space and‘ a water Jacket surrounding-said
mold space, a heat-retaining mass connected to
said mold at the top, a heat insulator between
said heat-retaining mass and said'water jacket.
‘turntable; a vwater rtank supported by said mast,
a plurality of fixed stations disposed about said
conduits connecting, said water tank and said
turntable, one of.‘ said‘ stations constituting a
molds; ‘each conduit having a valve and a control
pouring station and another constituting a
lever,’ a;stationary camway guiding said control
dumping station,.burners at certain of said sta-"
levers to admit water to andshut water oil?’ from
tions for heating said heat-retaining mass, con
said molds, a second camway secured to said base 10 rtrol means for feeding water to said jackets at
under said platform, second control levers guided
certain stations and stopping ?owpof water at
‘by said second camway, and connections between
other stations, and control means for moving said
said second levers and said molds to change the
molds to upright position for the pouring sta
positions of said molds as the turntable revolves.
tion and the heating stations and for tilting said
5. In apparatus for casting metal, a turntable, 15 molds for the dumping station, whereby con
means -> for mounting said turntable to revolve
trolled cooling 01' the molten metal is obtained.
about a vertical axis, a plurality. of open-top
moldsppivotally mounted around the circumfer
v .
ence‘ of said turntable, each mold comprising a
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