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Патент USA US3090100

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May 21, ì963
Filed Aug. 24, 1960
2 Sheets-Sheet l
May 21, ì963
_1. wooDBURN, JR
2 Sheets-Sheet 2
Filed Aug. 24, 1960
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United States Patent O " ICC
Patented May 21, 196s
The car 6 comprises wheels 8 which roll on tracks 10
and 'also comprises a cut-off or gate closing device gen
.lames Woodburn, Sir., Wheaton, lll., assignor to Arnsted
Industries Incorporated, Chicago, Ill., a corporation of
New Jersey
Filed Aug. 24, 196i), Ser. No. 51,657
4 Claims. (Ci. 2.2-84)
This invention relates to the art of bottom casting in
which molten metal or other fluid material is Iforced into
a bottom gate o-f a mold, and the invention relates more
particularly to novel means ‘for cutting off flow of such
material and to a method of producing such means.
According to prior art pnactices, the fluid material enters
the gate through ~an aperture of a cut-off slide which is
actuated to `close the gate when the mold has been filled.
According to such practices, the aperture has been bushed
to accommodate reuse of the slide.
erally `designated 12. The cut-off 12 is best seen in FIG
URES 2_4 and includes a slide support 14 having an
opening or hole 15 with a bushing 16 (FIGURE 3)
formed .as hereinafter described. The slide support 14
has a cut-out or slot 18 (FIGURE 2) pantly defined by
an inner edge 20 for a purpose hereinafter described.
A slide or plate 22 preferably of cast iron, copper or
-any other ‘desired’ chill material is slidably mounted on
the support 14 and comprises an opening or aperture 24
having la bushing 26 »similar in form and composition to
bushing 16, as hereinafter described. The slide 22 is sup
ported within a channel 28 (FIGURE 4) of the support
14 and is seated -along a surface thereof immediately below
another channel '34 within which is positioned a loose
insert 36 (FIGURES 2 and 3) which is complementary
-to and removably mounted in an opening 3S of a top plate
or panel 4t) of the car 6.
However, such practices have been limited to low melt
ing point alloys such as white metal and other low melting 20 The support 14 is releasably interlocked with the panel
point nonferrous metals which do not cause excessive ero
sion `of the bushings during the pouring.
dit by means of ears 42 on the support having apertures
within which are received lugs 46 on the underside of
panel 40. The lugs 46 are slotted to receive wedge keys
48 which are driven to locking position shown in FIGURE
According to .the invention, it has been discovered that
conventional core sand bushings, although eiîective in
such prior art practices, are not suitable Áfor the casting 25 4 and which may be quickly removed by an impact against
the small ends of the keys 48.
of iron, steel, and similar high melting point ferrous and
The insert 36 is provided with an opening or aperture
nonferrous metals which must be poured at temperatures
50 having a bushing 52 (FIGURE 3) similar in form and
in excess of 1500° F. and at velocities which cause ex
material to bushings 16 and '26, whereby when apertures
cessive erosion of such prior ant bushings.
Early efforts to solve this problem involved the substi 30 li5, 24 and ‘5d are aligned, they define a continuous pas
tution of a fired refractory material `for prior art sand core
sage for the ñow ofv molten metal into a gate 54 (FIG
bushings; however, such material proved to be costly and
to require expensive molding or machining to suitable
URE 3) of the mold 4.
The `assembly Z rolls along rails 10= (FIGURE >1) until
the apertures 15, 24 and Sti are located in vertical align
ment with the top of a pouring tube 58 (FIGURE 4),
According to the invention it has been discovered that
a satisfactory composite bushing can be produced by form
ing a conventional core sand mix sleeve around the perim
eter of a tired refractory liner in such manner that the
the lower end of which communicates with a source of
fluid material (not shown) lto be cast, such Ias a ladle of
molten steel. Under these conditions, the wheels 8> are
supported by rail segments 10a which are separable from
composite bushing which can be quickly and economically 40 rails 1d and are vertically movable.
sleeve and liner are bonded to each other to form a
assembled by manual insertion into- the top of an aperture
in a cut-off slide.
The foregoing and other objects of this invention will
The segments 10a are supported by a frame 60 which is
in turn supported at its corner-s, as by conventional worm
gear screw jacks 62. The jacks are mounted on founda-`
specification and the accompanying drawings, wherein:
tion-supported beams 66 and raise or lower the frame 60„
»as desired. The car 6 is guided at each side thereof in
FIGURE 1 is a perspective View of casting appanatus
embodying a preferred form of the novel composite bush
aligned relationship with the top of tube 58 by foundation
mounted guide rails 71 (FIGURE l) which snugly
confine therebetween a pin 73 on panel 4i) of car 6.
become apparent :from a consideration of the ifollowing
FIGURE 2 is atop plan View ofthe cut-off slide assem
bly shown in yFIGURE l;
FIGURE 3 is a fragmentary sectional view on line 3_3
of FIGURE 2;
FIGURE 4 is a Ifragmentary side elevational view of the
structure shown in FIGURE 2;
FIGURE 5 is a »sectional view on Iline 5_5 of FIG
When the assembly .2 is aligned with the top of tube
58, the jacks 62 are actuated to lower the frame 60 until
a tapered recess ’74 in the bottom of the support 14 en
gages a complementary tapered portion 76 (FIGURE 4)
of the upper end of tube 58. The frame continues to
lower until the support `i4- is clamped by force of gravity
or Iby other means (not shown) against the tapered por
tion of tube 58 to afford a seal tight to liquid metal be
tween the tube and the support 14, whereupon the molten
FIGURE 6 is a central vertical sectional View through
steel in which the tube 14 is immersed is pressurized (as
a core box and composite bushing `formed therein accord
for example in the manner disclosed by U.S‘. Letters Patent
ing to one manner of practicing the novel process; and
FIGURE 7 is a view corresponding -to FIGURE 6 but 60 No. 2,847,739 is-sued August 19, 1958 to E. Q. Sylves
ter) to flow the metal upwardly through apertures 15, 24
show-ing another manner of practicing the novel process.
and Sii and gate 54 until the mold has been filled. Tilting
Describing the invention in detail, a mold .assembly
URE 4;
generally designated 2 (FIGURE >1) comprises a mold 4
of the car 6 during pouring is limited by lugs 75 (FIG
which may be of a chill material, such as graphite or of 65 URE 1) mounted on the top of brackets 114, hereinafter
any other desired ceramic material well known in the
After the mold has been filled the slide 22 is actuated,
art, such as sand or shell. The assembly 2 also corn
as hereinafter described, to cut-olf flow of molten metal
prises a car 6 to which the mold 4 may be clamped by
conventional clamps 7 or by force of gravity. The mold
through the gate, whereupon pressure on the molten metal
4 and car 6, during a pouring oper-ation, as hereinafter de 70 is released, the rail `segments lita are elevated to mating
relationship with rails 10, andl the assembly 2 is rolled
scribed, move together as a unit or assembly 2 and may
along the rails away from tube 58, andv another assembly
be interconnected in any desired manner.
2 is rolled into position and poured as heretofore de
The manner in which the cut-off 12 is actuated can
best be seen in FIGURE 4, wherein it will be seen that
when the assembly 2 is supported on top of the tube S8,
a power device 78 mounted on a cover 80 of a chamber
or tank 81 containing the molten steel is disposed between
the slide 22 and an abutment 82 depending from the
underside of car panel 40 so that actuation of the device
78, as by hydraulic or pneumatic pressure, to expand the
device 78 axially thereof causes a cylinder member 84 of
the device 78 to engage the abutment 82 and a ram 0r
piston member 86 of the device 78 to engage the cut-off
slide 22.
The device 78 has a limited stroke and at the endY of
said stroke, the slide 22 is at a position whereat its aper
ture 24 is beyond edge 20 of the support 14, whereupon
molten metal in aperture 24 is dumped through slot 18
that shape from a segment of a refractory tube, which is
also an expensive procedure.
According to the invention, the liner 118 is cut to de
sired length from a standard tube and is sleeved over a
complementary boss or center arbor 119 of an annular
member 122 having -a metal ring 124 sleeved thereon to
form a metal core box which can be preheated to a de
sired temperature. The ring 124- is recessed as at 126 to
define a larger diameter portion of the opening in ring
1.24, within which opening the liner 118 is positioned.
A mixture of conventional shell mold Zircon sand and
2% (by volume) phenolic liquid thermosetting resinis
poured around the liner I118 and is struck olf ñush with
the top of the ring 124. rIhis mixture bonds with the
liner 118, the contacting surface of which is of sufficiently
irregular contour to aiîord a good bond. After the resin
has set, the novel composite bushing 118-120 is removed
from the core box 122, `124 by ejecter pins 128 having re
lease springs 129.
so that the lbushing 26 need not be replaced for each pour
ing operation. Also release of pressure on the molten 20 FIGURE 7 shows a modification of the novel process
metal in the tank 81 dumps the metal in bushing 16 so
wherein the shell mold sand mixture heretofore described
that it need not lbe replaced for each pouring operation.
is blown into core box 122, 124 by a conventional blow
The device 78 is afforded a ñoating support so that,
head 138, the member 122 being provided with suitable
upon actuation thereof, the forces developed by the de
vents 132 screened as at 134.
vice 78 to actuate the cut-oiî 12 to closed position are 25
It will be understood that, if desired, the apparatus
self-contained within the assembly 2. This support com
of FIGURE 7 can be utilized to form a sleeve 120
prises a bracket 88 mounted on top of the cover 80 as
from a sodium silicate-CO2 bonded sand by blowing into
by welding at 90. The bracket comprises a V-shaped
core box 122, 124 a mixture of silica sand and 5% (by
channel 92 (FIGURE 5) -within which a complementary
volume) sodium silicate. In this practice, «the core box
slide 94 is positioned. The cylinder member 84 is 30 122, 124 is not heated and after the blow head 130 has
clamped into the slide 94 by clamp rollers 98 on levers
been removed, a similar blow head is positioned on core
100 pivotally fulcrumed -at 102 (FIGURE 5) to the slide
box 122, 124 to -blow CO2 gas through the core box
94 and actuated by a compression clamping spring 104.
until the sleeve 120 has hardened.
Upon energization of device 78, as heretofore described,
Also, if desired, the sleeve 120 may be formed in the
the slide 94 permits enough axial movement of the device 35 core
box 122, 1-24 of 4FIGURE 7 by charging blow
78 so that the forces developed thereby are self-con
head 130 with a conventional mixture of, for example,
tained within assembly 2 and substantially no reactive
forces are transmitted to bracket 88 or cover 80.
l1/ê% (by volume) corn cereal, 2% (by volume) linseed
oil, 3% (by volume) water, and the remainder con
Upon removal of cylinder 84 from the clamps 98, which
can be accomplished by manually lifting the cylinder to 40 ventional silica core sand. After the core box 122, 124
has been filled with this mixture by blow head 130, the
compress spring 104, the spring 104 is held in position
latter is removed, and the core is ejected and baked in
upon bosses -112 of levers 100 ‘by a slight force provided
by a tension spring 113 connected to the lower ends of
lever 100.
a conventional core oven until hard, as for example, at
about 425 ° F. for about two hours.
After the composite bushing L18-4120 has been formed
' It may be noted that the cover 80l may be clamped to 45
heretofore described, it is hand ñtted into an assembly
the top of its container 81 by clamp means (not shown)
mounted on foundation-supported -brackets 114, and the
rail segments 10a may be manually removed from and
replaced upon the frame 60 to accommodate insertion
and removal of the cover 80 and a ladle (not shown) of 50
molten steel into which the tube 58 extends. The con
struction of the container 81, the ladleV (not shown), the
such as heretobefore described in connection with FIG
URES 2 and 3, and it will be understood that all bush
ings 16, 26 and 52 may be formed as composite bush
ings 118-»120 and may be assembled in the foregoing
Moreover, if desired, the composite bushing 118-120
cover 80 and tube 58 is per se no part of the present in
may be formed in situ within its opening 15, 24, or 50
the flange of bushing 52 engages the mold 4 around its
gate 54.
drical refractory liner in the sleeve, said sleeve being
by eliminating member 124 and inserting member 122
vention and may be of the type disclosed in said U.S.
Letters Patent, or if desired, may be of any other desired 55 in such opening and thereafter forming the bushing 118
‘120 by any of the foregoing methods.
construction and arrangement, ’with the tube mounted on
I claim:
the cover or elsewhere in communication with the molten
l, In a device for pouring molten high melting point
steel in the container 81.
metal into a mold through a bottom gate, the combi
It should 'be noted that bushings 16, 26 and 52 are
nation of a cut-ohc slide having an aperture registered
ilanged at their upper ends so that in their aligned position
shown in FIGURE 7, the flange of bushing 16 engages 60 with -the gate, a bushing in said aperture comprising a
sleeve with a flange recessed in the slide, a hollow cylin
slide 22, the liange of `bushing 26 engages insert 36 and
snugly ñtted in the aperture and being formed of sand
particles bonded to each other and to said liner by a
According to the inventiomeach bushing 16, 26, and
52 is of novel form and comprises a preñred refractory 65 binder said liner being formed of a refractory material
-liner 118 bonded to a flanged sleeve 120, as shown for
example in FIGURE 6, wherein a novel method of
making such a bushing is disclosed. The liner 118 is
formed of `a hard tired material such as graphite contain
ing clayrefractories so that the liner 1-18 does not erode 70
substantially during the pouring and shut-oft steps of a
more resistant to erosion by said molten metal than said '
sleeve, and means for actuating the slide to a position
where it cuts olf fiow of said molten metal from said
bottom gate when the mold has been tlìlled therewith.
2. In a method of forming a bushing for a cut-off
slide having an aperture through which molten high
cycle as heretofore described. Such material cannot beV
melting point metal flows into a mold gate, the steps of
economically molded to the desired bushing form and,
inserting a refractory liner into said aperture, and then
according to prior `art practices, must be machined to 75 filling the aperture around said liner with a mixture of
sand particles and fluid bonding material which, when
set, bonds the particles to each other and to the liner
and slide, to form a sleeve around the liner.
3. In a device for pouring molten high melting point
prising a sleeve with a ñange recessed in said slide; a re
fractory liner in said sleeve; said sleeve being snugly
ñtted in the aperture and being >formed of sand particles
bonded to each other and to said liner by a binder;
metal into a mold through a bottom gate, the combi
said liner being formed of a refractory material more
nation of a cut-off slide having an aperture registrable
with the gate, a bushing in said aperture comprising a
sleeve with a ilange recessed in the slide, a cylindrically
resistant to erosion by said molten metal than said sleeve.
shaped refractory liner in the sleeve, said sleeve being
snugly ñtted in the aperture and being formed of sand 10
particles bonded to each other and to said liner by a
4. In a cut-off device for molds for high melting point
metals, the combination of: a cut-off slide having an
aperture therethrough; a bushing in said aperture com- 15
References Cited in the file of this patent
Phillips _____________ __ Aug. 16, 1938
Wessel ____________ __‘__ Jan. 26, 1943
Horvath ______________ __ I an. 17, 1950
Clough et al ___________ __ July 31, 1956
Bravard et al. _________ __ June 3, 1958
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