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Патент USA US3061909

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Nov. 6, 1962
w. A. HUNTER
3,061,899
APPARATUS FOR PRODUCING SAND MOLDS
Filed March 16, 1960
7 Sheets-Sheet 1
nvmvrm
WILLIAM A. HUNTER
BY
ATTY.
Nov. 6, 1962
w. A. HUNTER
3,061,899
APPARATUS FOR PRODUCING SAND MOLDS
Filed March 16, 1960
7 Sheets-Sheet 2
H
INVENTOR.
WILLIAM A. HUNTER
Nov. 6, 1962
. w. A. HUNTER
3,061,899
APPARATUS FOR PRODUCING SAND MOLDS
Filed March 16, 1960
7 Sheets-Sheet. 3
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INVENTOR
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WILLIAM A.Huu'r£R
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ATTY.
Nov. 6, 1962
w. A. HUNTER
3,061,899
APPARATUS FOR PRODUCING SAND MOLDS
Filed March 16, 1960
7 Sheets-Sheet 4
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INVENTOR.
76 WILLIAM A. HUNTER
BY
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Nov. 6, 1962
‘w. A. HUNTER
3,061,899
APPARATUS FOR PRODUCING SAND MOLDS
Filed March 16, 1960
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Nov. 6, 1962
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APPARATUS FOR PRODUCING SAND MOLDS
Filed March 16, 1960
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INVENTOR
WILLIAM A.
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Nov. 6, 1962
w. A. HUNTER
3,061,899
APPARATUS FOR PRODUCING SAND MOLDS
Filed March 16, 1960
'7 Sheets-Sheet 7
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INVENTOR
WILLIAM
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.HUNTER
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1
United States Patent 0‘ 'ice
1
2
APPARATUS FOR PRUDUCING SAND MOLDS
3,061,899
the empty ?asks proceeding from the remote location to
the ramming station and the ?lled ?asks with the molds
therein proceeding from the ramming station to the re
William A. Hunter, Morton Grove, 11]., assignor to Petti
bone Mullilren Corporation, Chicago, [1]., a corporation
mote location.
Numerous other objects of an ancillary nature, not at
of Delaware
this time enumerated, will become readily apparent as the
following description ensues.
In the accompanying seven sheets of drawings form
ing a part of this speci?cation one illustrative embodiment
The present invention relates to the centrifugal casting
of the invention has been shown.
of molten metals in the production of tubular articles 10
In these drawings:
such as pipe sections and has particular reference to the
FIG. 1 is a fragmentary side elevational view, some
preparation of sand molds designed for use in connection
what schematic in its representation, of a mold produc
with such centrifugal casting processes. Still more spe
ing and handling apparatus constructed in accordance
ci?cally, the invention relates to an apparatus for facili
with the principles of the present invention;
tating the forming of molds and for facilitating the han
FIG. 1a is a sectional view taken substantially along
dling of the ?asks in which the molds are formed.
the line la-la of FIG. 1 in the direction indicated by
The objects of the invention are manifold and, prin
the arrows;
cipalamong them is the provision of a novel apparatus
FIG. 2 is a top plan view of the structure shown in
for handling ?asks prior to, during, and after mold form
FIG. 1;
20.
ing operations, in the form of an automatic or semi
FIG. 3 is a side elevational view, partly in section, of
automatic machine which is adapted to operate cyclicly
a combined pattern draw, and ?ask centering, supporting
in a repetitive manner to mechanically perform various
and spinning mechanism employed in connection with
Filed Mar. 16, 1950, Ser. No. 15,285
2 Claims. (Cl. 22—20)
mold-forming operations including the transporting of
empty ?asks to a ramming station in an upright position
from a remote location; the operative placement of depo
sition of the ?asks upon a spinning table; the introduc
the invention;
tion into the ?asks of an inner core pattern or mandrel
FIG. 5 is a sectional view taken substantially along the
line 5-5 of FIG. 3 in the direction indicated by the
and of a base pattern; the centering of the ?asks upon the
spinning table, the alignment and centering of the inner
core and base patterns within the ?asks; the performance
of the spinning operation including the controlled ram
ming of sand into the rotating mold cavity; the inner
core and base pattern draw operations; the transporting
of the ?asks with the completed molds therein to a loca
tion remote from the ramming station; and the discharge
of the thus transported ?asks from the remote location
and the conduction thereof to a spinning and pouring
station.
In carrying out this object of the invention, a novel
form of ?ask-orienting mechanism has been devised by
means of which empty ?asks delivered thereto at a point
remote from the ramming station in a horizontal position
will, during their travel to the ramming station, become
upended so that upon arrival thereof at the ramming sta
tion they will be in a vertical position and in vertical
alignment with the spinning table, as well as with the in
ner core and base patterns maintained at the ramming
‘
FIG. 4 is a sectional view taken substantially along
the line 4——4 of FIG. 3 in the direction indicated by the
arrows;
arrows;
FIG. 6 is a fragmentary sectional view taken substan
tially centrally and vertically through a rotary ?ask and
mold transfer and upending mechanism by means of which
empty ?asks are delivered to the ramming station in a
vertical position while at the same time the loaded ?asks
with the completed mold bodies therein are delivered to
a transfer station in a horizontal position, and from which
transfer station the mold bodies are conducted to the
spinning and pouring station;
FIG. 7 is a sectional view taken substantially along
the line 7-7 of FIG. 6 in the direction indicated by
the arrows;
FIG. 8 is a sectional view taken substantially along
the line 8-8 of FIG. 6 in the direction indicated by the
arrows;
FIG. 9 is an enlarged fragmentary sectional view taken
substantially along the line 9-9 of FIG. 2 in the direc
tion indicated by the arrows;
station.
FIG. 10 is a fragmentary side elevational view similar
In the production of said molds of the character brie?y
to FIG. 1 showing the various parts of the mold produc
outlined above, it is desirable that as many handling op 50 ing and handling apparatus in a diiferent position; and
erations as possible be performed mechanically inasmuch
FIG. 11 is an enlarged sectional view taken substan
as most of these operations involve the handling of heavy
tially along the line 11-41 of FIG. 9 in the direction
objects and articles, With both skill and physical strength
indicated by the arrows.
being required for an operator to make consistently ac
Brief Description
ceptable molds. Since molds of this sort must conform 55
closely to speci?cations with small allowable tolerances,
Referring now to the drawings in detail and in partic
the production of relatively heavy molds invariably entails
ular to FIGS. 1, 2 and 10, brie?y, the mechanism dis
a large number of rejects due to operator fatigue, particu
closed in these views is of a cyclicly operable nature and
larly at the end of any given working shift. Accordingly,
it comprises a lift frame assembly 10 which is positioned
it is an object of the present invention to provide an auto 60 in the vicinity of a ramming station R and which has as
matic or semi-automatic machine which will produce
sociated therewith a vertically shiftable lift and center
molds of uniformly acceptable quality at a rapid rate of
ing carriage 12. The carriage 12 is movable between
the lower position in which it is shown in FIG. 1 and the
an operator. This being among the principal objects of
the invention, another and important object is to provide 65 upper position in which it is shown in FIG. 10. The car
riage 12 is movable between its upper and lower posi
an apparatus of this sort wherein dual ?ask transferring
tions under the control of an hydraulic piston and cylin
operations are effected between the ramming station and
der assembly 14. A spinning table 16 is disposed at the
the remote location where the empty ?asks are supplied
ramming station R and is adapted to operatively receive
to the apparatus and the ?lled ?asks are discharged from
the apparatus, such dual transferring operations including 70 thereon the lower ?anged end 18 of a tubular shell ?ask
2i} and, in the lowered position of the carriage 12 as
the simultaneous passage of ?asks in opposite directions
shown in FIG. 1, a series of centering rollers 22 straddle
between the ramming station and remote location with
production with a minimum of attention on the part of
3,061,899
4
3
and engage the upper ?anged end 24 of the shell ?ask
and serve to center the same above the spining table 16.
The carriage 12 also has associated therewith an upper
pattern centering and pattern draw assembly which has
been designated in its entirety at 26 (FIG. 9) and by
them on a pair of inclined ramp-forming rails 62 by
means of which, under the in?uence of gravity, the ?asks
may be transported to a remote spinning and pouring
station SP to produce the metal pipe casting by known
centrifugal casting operations. From the spinning and
means of which the upper end of a tubualr mandrel or
pouring station the ?asks with the ?lled molds therein
inner core pattern 28, which also is operatively seated
are transported to a shakeout station where the cast pipe
sections are removed from the molds and the empty
?asks are deposited in a horizontal position on rails 64
upon the spinning table 16 and is concentric with the tu
bular ?ask 20, is centered above the table. The ?ask 20
is provided with a pair of spaced medial ?anges 25 and 10 for return by gravity therealong to the transfer station,
at which station the empty ?asks are delivered by a
27 which serve as centering devices at the transfer sta
tion in a manner and for a purpose that will be described
pivoted gate assembly 66 to the jaw assemblies associ
subsequently.
ated with the turret 42.
The various machine operations brie?y outlined above
In moving from its lowered position to its elevated
position, the ‘flask 20 is released by the carriage but the 15 may be carried out at the will of an operator by suitable
manual control mechanism, in which case the machine
inner core pattern 28 is retained thereby so that in the
may be regarded as being semi-automatic in its opera
elevated position in which it is shown in FIG. 9, the pat
tion. It is within the purview of the present invention
tern 28 remains suspended preparatory to its reuse dur~
however to cause fully automatic cyclic machine opera
ing the next succeeding machine cycle in association with
tions under the control of suitable timing mechanism or
a new ?ask 20.
interdependent sequence actuating mechanism. The
The spinning table 16 at the ramming station R is
present invention is not concerned with the particular
mounted for rotation about -a vertical axis under the in
manner in which sequential machine operations are
?uence of a ?uid motor assembly 30 (see also FIG. 3).
initiated and, irrespective of the means whereby these
The spinning table 16 per se constitutes the subject mat
operations are caused to follow one another, the essential
ter of my copending application Serial No. 39,634, ?led
features of the invention are at all times preserved.
on June 29, 1960 and entitled “Apparatus for Producing
Sa-nd Molds." The ?uid motor assembly 30, and also the
The Combined Pattern Draw and Flask Centering,
spinning table 16, constitute elements of a combined
Supporting and Spinning Mechanism
lower pattern draw and ?ask spinning mechanism 32, this
THE LIFT FRAME ASSEMBLY
mechanism further embodying hydraulic piston and cyl 3O Referring now to FIGS. 1, 2 and 10, the lift frame as
inder assemblies 34 by means of which the spinning table
sembly 10 involves in its general organization a support
16 may be moved between its elevated operative position
ing base 70 which is bolted as at 72 or is otherwise suit
and its lowered inoperative position wherein a- lower or
ably mounted on the foundry ?oor 74 or other support
hub pattern 36 carried thereby is withdrawn from the
ing
surface and has projecting vertically upwardly there
35
lower open ?anged end 18 of the ?ask 20'.
from a cylindrical standard 76 of appreciable height. In
Positioned adjacent to the ramming station R and on
the upper regions of the standard 76 there is provided a
the side thereof remote from the lift frame assembly 10
pair of diametrically disposed rails 78 which extend ver
is a rotary ?ask and mold transfer and upending mech
tically along the standard on opposite sides thereof. Gus
anism which has been designated in its entirety at 40.
set webs 80 are formed on the base 70 and lower regions
The mechanism 4t) is in the form of an oscillatory turret
of the standard 76 for reinforcing purposes. The stand
assembly 42 (see also FIG. 5) which is mounted for ro
1ard 76 has formed thereon a pair of vertically spaced
tation in opposite directions about a vertical axis on a
bosses 82 and 84 respectively, the boss 82 being disposed
stationary turret base 44. Projecting horizontally out
near the base 70 and the boss 84 being disposed at a
wardly in opposite directions from the turret assembly
region slightly below the lower ends of the rails 78. The
42 are a pair of ?ask handling jaw assemblies or cradles 45 boss 82 serves to support thereon the lower end of an
46 and 48 respectively, each assembly having associated
therewith a pair of releasable ?ask-clamping ?ngers 50.
The ?ngers 50 are movable between a closed ?ask-clamp
ing position and an open ?ask-releasing position under
the control of a ?uid operated actuator 52 in the form
of a piston and cylinder assembly.
The turret assembly 42 is adapted to be periodically
indexed through an angle of 180° under the control of
elongated vertically disposed cylinder 86 which consti
tutes one of the principal elements of the previously men
tioned piston and cylinder assembly 14. The upper end
of the cylinder 86 is supported by the upper boss 84. A
piston 88 is reciprocable in the cylinder '86 and has con
nected thereto a piston rod ‘or plunger 90, the upper end
of which is connected to the vertically shiftable lift and
centering carriage 12. The opposite end regions of the
a ?uid-actuated motor 54- which is enclosed within the
cylinder 86 are provided with ?uid ports 92 and 94 re
turret base structure 44- (FIGS. 6 and 7).
The two jaw assemblies 46 and 48 are rotatable about
respective ?uid lines 96 and 98‘ to a suitable control valve
a common horizontal axis and they are capable of being
rotated in unison throughout an angle of 90° so that an
empty ?ask 20 received in one of the jaw assemblies in a
horizontal position at the transfer station T as shown in
FIG. l,'may be upended and delivered to the ramming
station R in a vertical position, while at the same time,
a ?ask 20' containing a mold which has been spin-formed
spectively which may be 'operatively connected through
(not shown) which may be either manually operable or
automatic and by means of which ?uid under pressure is
selectively applied to the ends of the cylinder for plunger
extension and retraction purposes.
Still referring to FIGS. 1, 2 and 10, the vertically
shift-able lift and centering carriage 12 may be in the
form of a casting including a base portion 1(l01to which
{at the ramming station R may be received by the other
the upper end of the plunger 90 is attached. An arm
jaw assembly in a vertical position and, by a declining 65 102 extends vertically upwardly from the base portion
operation, delivered to the transfer station T in a hori
100 and has a laterally turned bifurcated end 104 which
straddles the standard 76 and carries a pair of rollers
1G6 designed to travel on the respective rails 78. An
ing of the turret 42. The jaw indexing operations are an
hyperbolic roller 108 is carried on a pin 110 which eX
70 tends across the bifurcations at the top of the arm 1G2
automatic function of the turret indexing operations.
At the transfer station, the mold-containing ?asks 20
and is adapted to bear against the outer surface of the
are released by the jaw assemblies and deposited in a
standard 76. The carriage 12 is thus constrained to
cradle 58 associated with a transfer carriage 60 which
move tractionally along the standard '76 under the in
zontal position. The upending operation and the declin
ing operation, referred to above, take place during index
maintains them in their horizontal position and which
?uence of the plunger 90.
conducts them from the transfer station and deposits 75
A horizontal arm 112 extends laterally from the base
3,061,899
6
5
portion 190 of the carriage 12 and terminates in a hub
114 from which there extends radially outwardly a series
through ?uid' ports 177 and 179, above and below the
piston 176 respectively, by means of ?exible ?uid lines
of three spider arms 116.
17-3 and 186 leading from a suitable control valve (not
shown) which, in turn, is operatively connected to a
Each arm carries one of the
previously mentioned centering rollers 22. Each roller is
of generally frusto-conical design, the various rollers
eing mounted on suspension pins 126 which depend
from the outer ends of the respective arms 116.
As
source of motive ?uid.
Tie rods 182 serve to connect
the crosshead 164 and cylinder caps 172.
The lower ends of the stationary piston rods 174 are
reduced as at 184 and these reduced portions are sur
will be described in greater detail presently, the center
rounded by bushings 186 which, in turn, are centered
ing rollers 22 are adapted, when the carriage 12 is in its
lowered position, to straddle the circular ?anged end 10 in pilot ‘blocks 188 Welded as at 190 to a base plate 192.
A cylindrical casing 194 is welded as at 195 to the base
24 of a ?ask 20 undergoing ramming at the ramming
plate 192 and projects upwardly and extends in tele
station R.
scopic fashion into the lower open rim 196 of the skirt
THE INNER CORE PATTERN AND THE SUPPORTING
166. An anchor ring 198 for the upper ends of the
MEANS THEREFOR
Referring now to FIGS. 9 and 10, the inner core
pattern 28, which will hereinafter be referred to as the
mandrel, is in the form of a cylindrical member, the
upper rim of which is recessed as at 122 to provide a
seat for a centering plate 124. A shaft 126 extends up
wardly from the central regions of the plate 124 and
15 piston rods 174 is seated on the upper rim 260 of the
casing 194 and is formed with a central opening 202
through which the lower region of the tubular sleeve
portion 154 of the spinning table 16 is adapted to pro
ject. A pair of bushings 204 are mounted at diamet
rically disposed points on the anchor ring 198 and re
ceive therein the upper ends of the respective piston
projects into a central bore 128 which is formed in the
hub 114 of the lift carriage 12. The upper end of the
shaft 126 is reduced as at 130 and receives thereover
a lift collar 132. A bearing assembly 134 seats on the
collar 132 and a retention nut 136 is threadedly received
on the extreme upper end of the reduced portion 130
of the shaft 126. The underneath side of the hub 114
rods 174.
The previously mentioned ?uid motor 30 is of con
ventional design and no claim is made herein to any
novelty associated with the same. It is deemed su?icient
for purposes of disclosure and ‘description herein to state
that the motor 31) includes a cylindrical casing 210 hav
ing a rim ?ange 212 which is bolted as at 214 to the
is recessed as at 138 to provide a gland for a seal assem
underneath side of the crosshead 164. Intake and ex
bly 140. The bore 128 is provided with an internal
haust ?uid lines are designated at 216 and 218 respec
shoulder 142 which underlies the lift collar 132 and 30 tively and, upon admission of motive ?uid to the casing
constitutes a lift shoulder by means of which the rotatable
210, the output shaft 220 of the motor is caused to rotate
mandrel 28 is elevated and lowered bodily with the
in the desired direction.
carriage 12. A cover plate 144 closes the upper end
The motor shaft 220 is operatively connected through
of the bore 128 and is removably held in position by ‘ a ?exible coupling assembly 222 (FIG. 3) to a shaft
means of screws 146.
224, the upper end of which is threaded as at 226 and
threadedly receives thereon an alignment cone 228 for
The Pattern Draw, and Flask Centering Supporting and
centering a pattern base member or hub pattern 230‘ on
Spinning .Mechanism
Referring now to FIGS. 3 and 4 wherein the pattern
draw and ?ask centering, supporting and spinning mech
anism 32 is best illustrated, the lower end region of a
flask 20 is shown as being operatively positioned on the
upper surface 148 of the rotary spinning table 16, the
various ?asks being successively delivered to and re
moved from the table by the rotary ?ask and mold
transfer and upending mechanism 40 (FIG. 1). The
spinning table 16 is in the form of a casting including
a tubular sleeve portion 154 from the upper portion
of which the table proper 156' extends radially out
the table surface 148. The hub pattern is provided with
a contoured surface 232 of any desired configuration,
as for example, that of the lower hub or bell of a metal
pipe section subsequently to be cast by a centrifugal
casting process in the pipe molds undergoing formation
in the spinning apparatus. The hub pattern 230 is con
centric with the circular table 156 and during ?ask spin<
ning operations, the lower ?anged end 18 of the ?ask 29' is
centered about the hub pattern 230 by means of center
ing guides 234 (see also FIG. 4) disposed at equally
spaced regions around the periphery of the table 198.
wardly. The sleeve portion 154 is rotatably supported 50 The Rotary Flask and M'old Transfer and Upending
by means of upper and lower bearing assemblies 157
and 159 respectively, upon a vertically shiftable but non
rotatable pedestal 153, the lower end of which is pro
vided with a pedestal base 169 which is bolted as at
162 to a crosshead 164. A cylindrical sheet metal apron
166 depends from the peripheral regions of the table
Mechanism
THE TURRET MOUNTING AND DRIVE MEANS
Referring now to FIGS. 6, 7 and 8 wherein the details
of the rotary ?ask and mold transfer and upending mech—
anism 46 are best illustrated, the previously mentioned
roper 156 and serves to shield the pedestal 154, as well
as certain other instrumentalities associated with the as
turret base 44 embodies a casting or frame 259 which may
FIG. 5, the crosshead 164 extends between and serves
tapering design is provided with a ?anged base portion
be generally of frusto-conical design and the upper rim of
which is provided with an inturned supporting and bolting
sembly 32 and which will be described in detail presently.
Still referring to FIGS. 3 and 4, and additionally to 60 ?ange 252. A hollow tubular pedestal 254 of upwardly
256 which is bolted as at ‘257 to the bolting ?ange 252.
to operatively connect a pair of vertically reciprocable
The previously mentioned turret assembly 42 is com
cylinder units 168, each unit constituting a principal
prised of two principal parts including a lower sleeve sec
component of one of the previously mentioned piston
tion 258 and an upper turret housing section 260, the two
and cylinder assemblies 34. Each assembly 34 involves 65 sections
being bolted together as at 262. The lower sleeve
in its general organization a cylinder proper 170, the
section 258 surrounds the pedestal 254 and is rotatabiy
upper end of which is secured in the crosshead 164 and
supported thereon by means of upper and lower bearing
the lower end of which is secured in a cylinder cap 172.
assemblies 264 and 266 respectively. The lower ?anged
The two cylinders 17% are vertically reciprocable in 70 rim portion 267 of the tubular sleeve section 258 carries
unison and they are guided in their vertical movements
a dust cap ring or retainer 268 for a felt or other sealing
by a pair of stationary piston rods 174 which they
ring 27 0 which bears against a cylindrical surface 272 of
surround. Each rod 174 carries in the medial regions
the pedestal ‘254. The upper end of the pedestal 254 has
thereof a piston 176. Fluid under pressure is adapted
secured thereto by means of anchoring screws 274 a
to be admitted to the opposite ends of each cylinder 170v 75 stationary bevel gear 276 having teeth 277 thereon and
3,061,899
blies 46 and 48 are substantially identical in construction
and therefore it is believed that a description of one of
them will su?ice for them both.‘ Each jaw assembly is in
of 180°. The function of the bevel gear 276 is to provide
the form of a jaw cradle 350 of generally U-shape con
a fixed reaction member for the tractional drive of a sec
ond and intermeshing bevel gear 278 having teeth 279 Cu ?guration in longitudinal cross section and including a
pair of parallel side plates 352 and 354 respectively
thereon and the am's of which extends horizontally. This
the axis of which extends vertically. The circumferential
or arcuate extent of the gear 276 may be slightly in excess
latter gear serves to impart rotational movements to a jaw
(FIG. 1a), and a connecting web plate 356. The plate
supporting shaft 230 on which the previously mentioned
jaw assemblies 46 and 48 are operatively mounted, all in
356 is formed with a central circular opening 358 therein
into which the distal end of the adjacent reduced portion
a manner and for a purpose that will be made clear 10 334 of the shaft 230 extends and in which opening it is
presently.
The turret assembly 42 is adapted to be rotated alter
nately in opposite directions throughout an angle of 180°,
each such 180° rotation constituting a machine cycle dur
ing which an empty ?ask 20‘ is brought from the transfer
station T to the ramming station while simultaneously a
rammed ?ask 20 is moved from the ramming station to the
transfer station. Accordingly, a drive shaft 282 projects
upwardly through the ?xed pedestal 254 and the upper
end of the shaft carries a coupling member 284 which is
splined as at 286 to the shaft and keyed as at ‘288 to an
secured by welding. Each side plate 352 and 354 is
formed with a forwardly extending ?xed jaw ?nger 360
which projects forwardly from one longitudinal edge of
the side plate, the two jaw ?ngers 360 extending in par
allelism and constituting in effect a composite ?xed jaw
which is opposed by the previously mentioned pivoted jaw
?ngers 50. These latter jaw ?ngers 50 have their base or
proximate ends seated within recesses ‘364 provided in
the respective side plates 352 and .354 and which are
rigidly connected together by a transverse operating shaft
366. The ends of the operating shaft 366 are rotatably
mounted in the two side plates 352 and 354. The oper
ating shaft 366 has ?xedly secured thereto in the medial
regions thereof a torque arm 368, the distal end of which
inwardly extending web 230 formed on the upper turret
section 260.
The lower end of the vertical drive shaft 282 is opera
tively connected by means of a coupling assembly 292 to 25 is adjustably and pivotally connected by a yoke 370‘ which
is threaded on one end of a piston rod 372 associated with
the vertical output shaft 234 of the previously mentioned
the previously mentioned piston and cylinder assembly 52.
?uid-actuated motor 54. The motor 54 is suspended by
The other end of the rod 372 extends into a cylinder 374,
means of suitable bolts 296 from an internal frame web
an end of which is pivoted as at 376 to an ear 3’7 8 mounted
298 associated with the same. Brie?y however, the
motor 54 includes a casing 300 of generally cylindrical 30 on the web plate 356. The cylinder is provided with ?uid
ports 380 and 332 connected to respective ?exible ?uid
design and providing an internal operating chamber 302
lines 384 and 386 which may be operatively connected to
for a pivoted vane 304. The output shaft 294 extends
a suitable control valve (not shown) by means of which
vertically through the chamber 302 and the vane 304 is
motive ?uid may be selectively directed to the piston and
carried by and extends radially outwardly from the shaft
cylinder assembly 52. The two ports are disposed on
within the casing 300 so as to make substantial sealing
and sweeping contact with the inside cylindrical face of
the casing 300. A relatively thick web 306 is formed
internally on the casing 302 and extends radially in
wardly and makes substantial sealing contact with the shaft
opposite sides of a piston 388 within the cylinder 374, the
latter being operatively mounted on the piston rod 372.
The inner opposed surfaces of the various jaw ?ngers
the chamber 302 through respective ?uid ports 312 and
tion will be transmitted to the pivoted jaw ?ngers 362
for jaw opening and closing purposes in a manner and
36% and 362 are curved to conform to the cylindrical
294. The pivoted vane 304 is designed to be swung 40 outer surfaces of the ?asks 20 undergoing transfer be
tween the ramming station R and the vtransfer station T
within the casing 300 through an angle of 180° in oppo
and vice versa. Thus it will be seen that upon selective
site directions under the motivating in?uence of ?uid
application of motive ?uid to the opposite ends of the
under pressure admitted to the interior of the casing 300
cylinder 374 through the ports 380‘ and 382, rocking mo
through ?uid lines 308 and 310 which communicate with
314.
Angular swinging movement of the vane 304 is
limited in opposite directions by means of internal lugs
or stops 316 and 318 formed on the casing wall.
The ?uid lines 308 and 310 may be operatively con
nected to a suitable control valve (not shown) which, in
turn, is connected to a source of the motive ?uid under
pressure. Thus, the ports 312 and 314 alternately may
serve as ?uid inlet and ?uid outlet ports for alternate
movement of the vane 304, and consequently of the
output shaft 282 and turret assembly 40 in the opposite é
directions.
THE JAW ASSEMBLY MOUNTING AND DRIVE MEANS
Still referring to FIG. 6, the upperr turret housing sec
tion 26%) includes spaced end walls 320 and 322, through
which there extend aligned openings 324. The jaw-sup
porting shaft 280 extends horizontally through the hous
ing section 260 and is rotatably journalled in the aligned
openings 324 by means of respective bearing assemblies
326. Near the outer rims of the openings 324, suitable
dust seal assemblies 328 are provided between the shaft
280 and end walls 320 and 322.
The shaft 280‘ is formed with a reduced section 330
and the bevel gear 278 is mounted on and keyed as at 332
to this reduced shaft section. The shaft 280 is further
reduced as at 334 at the opposite ends thereof and these
for a purpose that will be made clear presently.
The Flask Take-O? and Delivery Mechanism at the
Transfer Station
As best seen in FIGS. 1, 2 and 10, there is provided at
the transfer station T a ?ask take~off and delivery mecha
nism which includes the previously mentioned transfer
carriage 60 and delivery gate 66.
FLASK' TAKE-OFF MECHANISM
The ?ask take-off mechanism includes the transfer car
riage ‘E0 and rails 62. The transfer carriage is com
prised of two spaced apart yoke arms 400 having their
lower proximate ends secured to a horizontal rock shaft
402 which extends between a pair of base supports or
standards 404. A transverse shaft 406 is connected at its
ends to the yoke arms 4'00 and constrains these arms to
move in unison. A piston and cylinder assembly 408
including a cylinder 410 and a piston 412 has the cylinder
component thereof pivoted ‘as at 414 to a fixed reaction
member 416 while the piston component is provided With
a piston rod 413, the distal end of which is pivotally con
nected to the shaft 406. The cylinder is provided with
?uid ports 426 and 423 at the opposite end regions thereof
which are connected to respective ?uid lines 430 and 432.
reduced end portions have operatively mounted thereon
These latter ?uid lines may be operatively connected to a
the respective jaw assemblies 46 and 48.
control valve (not shown) for selective admission of
THE LAW ASSEMBLIES
fluid to the opposite ends of the cylinder 410.
The transfer carriage is movable between the advanced
Referring now to FIGS. 1, 2 and 10, the two jaw assem 75
3,061,899
10
position wherein it is shown in FIG. 1 and the retracted
position wherein it is shown in FIG. 10. In its advanced
position, the cradle 58 underlies one of the clamping jaw
assemblies 46 or 48, as the case may be, at the transfer
station T and is in a position to receive by gravity from
the jaw assembly a discharged ?ask 20. In its retracted
position the yoke arms 4%!) which cooperate to make up
the cradle 69 are adapted to engage respective limit stops
434 while the cradle portion 58 of the transfer carriage
the spinning operation has been completed. During the
spinning operation, the rotating ?ask is loosely nested or
cradled, so to speak, within the con?nes of the jaw assem
bly but it is not engaged or otherwise restrained against
rotation by the assembly. Immediately thereafter motive
fluid is supplied to the piston and cylinder assembly 52 to
close the jaws and cause the vertically disposed ?ask 25}
to be ?rmly gripped thereby.
'
During the spinning operation just described, the jaw
overlies ‘an extreme end region of the rails 62 in such a 10 assembly 48 at the transfer station has its jaw axis extend
ing horizontally so that when the pivoted jaw ?ngers 362
manner that the ?ask 20 carried by the cradle will be
are in their open position the jaws will be conditioned to
deposited on the rails 62 with the two ?anges 25 and 27
receive therein an empty ?ask 20 by gravity from the rails
straddling the rails as shown in FIG. 2 for subsequent
64. The two centering ?anges 25 and 27 on the ?ask 20
tractional rolling movement of the ?ask along the inclined
straddle the rails 64 and prevent endwise movement of
rails to the remote spinning and pouring station.
the ?asks on the rails. The jaw assembly 48 may be load
THE JA'W LOADING MECHANISM
The jaw loading mechanism is best illustrated in FIGS.
1, 2 and 10 and includes the previously described rails 64
and the pivoted gate assembly 66. The gate assembly 66
is comprised of a pair of spaced parallel gate ?ngers 436
which are connected together for movement in unison
by a transverse connecting bar 450 and which are pivoted
as at 451 adjacent but a slight distance inwards of their
proximate ends to the end regions of the respective rails
62'. The bar 450 carries an attachment lug 452 by means
of which the bar may be operatively connected to an
actuating piston and cylinder assembly 454. According
ly, the cylinder 456 of the assembly 454 is pivoted as at
457 to a ?xed reaction point 459. A piston 45?» which
is reciprocable in the cylinder 456 has its free end pivotal
ly connected as at 462 to the attachment lug 452.
The
ed conveniently during the spinning operation at the
ramming station R and, accordingly, the piston and cyl
inder assembly 454 is supplied with motive ?uid in such
a manner as to cause the pivoted gate assembly 66 to be
come lowered to the position wherein it is shown in full
lines in FIG. 10 with the distal ends of the jaw ?ngers
50 and gate ?ngers 436 in substantial register. At such
time, the foremost ?ask 20 of the series of ?asks carried
on the rails 64 will roll by gravity from the inclined gate
?ngers to the jaw ?ngers and, immediately thereafter,
motive ?uid is supplied to the piston and cylinder assem
bly 52 to cause the jaw ?ngers 362 to close and elevate
the ?ask 20 into the jaw cradle while at the same time
the ?ask will be ?rmly gripped by the jaws.
After the jaw assembly 48 has thus been loaded at the
cylinder is provided with ?uid ports 464 and 466 which
transfer station T and the spinning operation at the ram
ming station R has been completed, the ?uid motor 54
are connected through ?uid lines 463 and 476 to a suit
able control valve by means of which motive ?uid is
is energized in such a manner as to rotate the turret assem
bly 42 in a counterclockwise direction as viewed in FIG.
selectively applied to the ports 464 and 466.
The gate ?ngers 436 are adapted normally to be main
tained in the elevated full line position wherein they
are shown in FIG. 1. The gate ?ngers 436 are of arcuate
design, the are being of relatively long radius or curva
ture. When the ?ngers 436 are thus elevated, the distal
ends thereof are maintained above the level of the rails
62 so that the gate member 66 will act as a limit stop to
prevent any ?ask or ?asks supported on the rails from
running oif the end of the rails. In the lowered position
of the ?ngers 436, the ends of the latter register with the
ends of the pivoted jaw ?ngers 362 as shown in ‘FIG. 10
when the latter are in their open position so that the
foremost ?ask 29 on the rails 64 may travel along the
gate member and roll down the inclined upper edges there
of and enter the open jaw structure 46 or 48 as the case
may be. At the same time, the extreme proximate end
regions 472 of the gate ?ngers 436 will become slightly
elevated above the level of the forward ends of the rails
as and serve as a stop for the foremost ?ask 20 in the
rails.
Operation of the Apparatus
2 throughout an angle of 180° and cause the jaw assembly
43 to move bodily from the transfer station T to
the ramming station, while at the same time the jaW
assembly 46 is moved bodily from the ramming sta
tion to the transfer station. During such rotation of
the turret assembly 42, the rotatable bevel gear 278
on the horizontal jaw-supporting shaft 230‘ will ride
tractionally on the ?xed intermeshing bevel gear 276
which has twice the number of teeth 277 thereon than
the number of teeth on the gear 278 and describe an
angular movement of 90° while the turret' describes an
angular movement of 180°, thus causing a complete up
ending of the horizontal jaw assembly
by the time it
arrives at the ramming station R. The ?xed‘ gear 276
thus functions in the manner of a stationary toothed arcu
ate rack, while the gear 278 functions as a cooperating
pinion. Upon arrival of the loaded jaw assembly 48 at
its home position at the ramming station, the axis of the
?ask carried thereby will extend vertically and, as shown
in FIG. 10, the ?ask will be maintained in an elevated
position above the level of the spinning table 16 which,
at that time, is in its lowermost position. The lower end
of the mandrel 28 which is supported by the vertically
shiftable lift and centering carriage 12 will assume an
elevated position above the level of the upper end of the
?ask 20 with the mandrel 28 poised, so to speak, for
subsequent descent into the ?ask. In this position of the
?ask 2d, the axes of the spinning table, the ?ask and
mandrel are in vertical alignment.
wall of the ?ask 29 and the mandrel 28. These wads are
After the ?ask 26 carried by the jaw assembly 48 has
delivered to the ?ask after the ?ask and pattern have been
properly positioned and centered upon the upper surface 65 been brought to its ?nal position at the ramming station R,
?uid is supplied through the ?uid lines 178 to the ports
of the table proper 156 and while the table is being rotated
177 associated with the hydraulic piston and cylinder as
under the in?uence of the ?uid motor 30. The speed of
semblies 168. The admission of ?uid to the upper ends
rotation of the ?ask 26 will control the density of the
of the cylinders 176 above the pistons 176 associated
sand mold formed in the ?ask.
therewith will cause the previously lowered cylinders to
Assuming that the jaw asembly 46 is disposed at the
become elevated to the position in which they appear in
rannnin‘T station R and that the jaw assembly 425 is dis
FIG. 3. Such elevation of the cylinders 170 will cause
posed at the transfer station T during a given spinning
the crosshead 164 to become elevated and the latter, act
operation, the pivoted jaw ?ngers 50 of the assembly 48
ing through the pedestal 158, will cause the spinning table
is maintained in their open position until such time as 75 16 to move into operative register with the lower ?anged
The operation of the apparatus may be described almost
in its entirety with reference to FIGS. 1 and 10. A
stationary sand slinger, a fragment of which has been
designated at 489 in FIG. 1 and which is of conventional
design, is adapted to deliver sand in the form of wads or
slugs to the cavity which exists between the cylindrical
3,061,899
1I
end 18 of the vertically disposed ?ask 26 carried by the
12
jaw assembly 48, the centering guides 234 serving to
may be resorted to without departing from the spirit of
the invention. For example, while the turret assembly
maintain the end 18 centered upon the table proper 156.
As soon as the spinning table and ?ask have been thus
successive indexing operations thereof throughout an angle
42 has been described herein as being oscillatable in that
moved into operative register, ?uid under pressure is sup
plied to the port 94 through the ?uid line 98 to drive the
piston 88 in its plunger 99 downwardly to effect lowering
of the lift carriage 12, and consequently of the mandrel
28. The mandrel is thus lowered into the upper end of
of 180° are accompanied ‘by a reversal in the direction
of turning movement of the turret, it is within the scope
of the invention to effect unidirectional indexing move
ments of the turret assembly, utilizing full instead of par
tial bevel gears in the turret housing, in which case rotary
the ?ask 20 and the alignment cone 228 causes the lower 10 slip connections for the various ?exible ?uid lines in
volved will be required. Other modi?cations of the struc
end of the mandrel to become seated and centered upon
tural devices embodied in the apparatus as disclosed here
the hub pattern 230 as shown in FIG. 3. In this position
in are contemplated within the purview of the present in
of the parts, the upper ?anged end 24 of the ?ask 20 is
vention while, similarly, variations in the procedural de
centered between the three rollers 22 preparatory to ini
tiation of the ?ask spinning operation.
15 tails of the disclosed method by means of which the in
vention is carried out are contemplated. For example,
Upon admission of ?uid to the hydraulic motor 30
through the intake ?uid line 216, spinning operations will
be initiated, the output shaft 2220 serving to drive the spin
ning table 16 through the coupling assembly 222 and shaft
224. Wads of sand are fed to the ?ask from the slinger
486 in the manner previously described and, after the sand
mold has been formed, spinning operations are terminated
and ?uid is supplied to the port 92 of the piston and cyl
inder assembly 14 through the ?uid line 96 to cause the
carriage 12 to be elevated, thereby raising the mandrel 28
and effecting the upper pattern draw operation. Similar
ly, ?uid is supplied to the ports 179 of the piston and cyl
inder assemblies 168 through the ?uid lines 180 to lower
the cylinders proper 170 and crosshead 164, thus lowering
the spinning table 16 and effecting the lower pattern draw
operation and freeing the ?ask with the mold therein for
conduction by the mechanism 40 to the transfer station T.
To effect such transfer, ?uid is supplied to the piston
the introduction of excess sand into the ?ask at the nam
ming station and the striking off of the sand so that the
same will be ?ush with the top of the pattern prior to
closing of the ?ask 20 preparatory to the spinning oper
ation at the ramming station are conventional practices
which may ‘be resorted to if necessary without affecting
the essential features of the process. Only insofar as
the invention has particularly been pointed out in the
accompanying claims is the same to be limited.
Having thus described the invention what I claim as
new and desire to secure by Letters Patent is:
1. In an apparatus for the production of molds for use
in the centrifugal casting of hollow cylindrical metal ob
jects, in combination, means establishing a spinning and
pouring station, a ramming station, and an intermediate
transfer station, a horizontally disposed vertically shift
able spinning table mounted for rotation about a vertical
and cylinder assembly 52 to cause the movable jaw 59 to
axis at the ramming station, a base pattern mounted on
close upon the ?ask body between the ?anges 25 and 27, 35 said table, a vertically shiftable centering and lifting head
for a core pattern at said ramming station in vertical
after which the ?uid motor 54 may be operated in the
alignment with the spinning table, a core pattern rotatably
manner previously described to rotate the turret 42
mounted on said lifting head and movable bodily there
throughout a 180° increment of turning movement thus
causing the jaw assembly 48 with the ?ask 20 carried there
with during vertical movements of the latter, said table
and lifting head being capable of relative approaching and
by to be conducted to the transfer station while at the
retracting movement in opposed relation for cooperation
same time, due to the previously described cooperation
with cylindrical shell ?asks which are successively posi~
between the intermeshing ?xed and movable bevel gears
276 and 278 respectively, the shaft 280, and consequently
tioned therebetween, power actuated means for shifting
the jaw assembly 48 will be turned about a horizontal axis
said lifting head vertically, power actuated means for
through an angle of 90° to deliver the ?ask 20 to the
shifting said table vertically, a ?rst inclined ramp extend
45 ing between the spinning and pouring station and the
transfer station T in a horizontal position.
transfer station and having its lower delivery end termi
It will be understood, of course, that during each in
dexing operation of the turret 40, whether the motion
nating at said latter station, said ramp being adapted to
receive empty cylindrical ?asks thereon in a horizontal
thereof be clockwise or counterclockwise, as viewed in
position at the spinning and pouring station for conduc
FIG. 2, an interchange of the jaw assemblies 46 and 48
tion therealong by a rolling action under the in?uence of
between the transfer and ramming stations will take place.
Movement of either jaw assembly 4-6 or as from the trans—
gravity to the transfer station, a second inclined ramp
extending between the spinning and pouring station and
fer station to the ramming station is accompanied by an
the transfer station and having its lower delivery end ter
upending of the ?ask 20 carried in such jaw assembly.
minating at said latter station, said second ramp being
Conversely, movement of either jaw assembly 46 or 48
from the ramming station to the transfer station is accom 55 adapted to receive mold-containing ?asks thereon in a
horizontal position at the transfer station for conduction
panied by a declination of the ?ask 20 and its contained
therealong by a rolling action under the in?uence of grav
mold carried thereby.
ity to the spinning and pouring station, a turret mounted
As soon as the ?ask 20 has thus been returned to the
for rotation about a vertical axis between the transfer
transfer station ?uid is supplied to the piston and cylinder
and ramming station, a pair of ?ask-receiving and gripping
assembly 52 to open the jaw ?nger S0 and release the ?ask
jaws carried by said turret and rotatable about a common
20 to the transfer carriage 60‘ which, at this time assumes
horizontal axis between positions wherein the axes of the
the position in which it is shown in FIG. 1 in proximate
jaws extend horizontally and positions wherein the axes of
register with the jaw assembly 18.
the jaws extend vertically, said jaws being capable of inde
Inasmuch as a full description of the operation of the
transfer mechanism at the transfer station T has pre 65 pendent opening and closing movements for ?ask-releas
ing and ?ask-gripping operations respectively, said turret
viously been rendered, it is believed that the nature, oper
being operable, upon rotation thereof throughout an angle
ation and many advantages of the herein described ?ask
handling and mold forming apparatus will be readily
understood without further detailed description. The in
of 180° to move one jaw from the transfer station to the
ramming station and to simultaneously move the other
vention is not to be limited to the exact arrangement of 70 jaw from the ramming station to the transfer station,
means operatively connecting said jaws for rotational
parts shown in the accompanying drawings or described in
movements
in unison, each of said jaws assuming a posi
' this speci?cation since the disclosure made herein is some
tion wherein its axis extends horizontally when the other
what schematic in its representation and various changes
jaw is so disposed that its axis extends vertically and vice
in the details of construction and in the mode of operation 75 versa, means constraining each jaw to assume a position
3,061,899
13
14
wherein its axis is in operative vertical register with the
lifting head and table when such jaw is disposed at the
2. In an apparatus for the production of molds for use
ramming station and to assume a position wherein its
axis is in horizontal register with the delivery end of said
?rst mentioned ramp when such jaw is disposed at the
transfer station, power actuated means for rotating said
turret, power actuated means for selectively actuating said
jaws, a transfer carriage disposed at said transfer station
for receiving ?asks discharged by said jaws at said latter
station and delivering the same to said second ramp, said 10
transfer carriage being movable between a position where
in it is in receiving register with a jaw disposed at the
transfer station and a position wherein it is in delivery
register with the receiving end of said second ramp, and
power actuated means for moving said transfer carriage. 15
in centrifugal casting of hollow cylindrical metal objects,
the combination set forth in claim 1 wherein said turret
is rotatable in opposite directions and wherein said power
actuated means for rotating the turret is selectively oper
able to impart turret-reversal motion to the turret through
out increments of 180° extent.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,550,514
2,850,775
Dimick ___________ _,.__ Aug. 18, 1925
Northington et a1. ____ __ Sept. 9, 1958
2,859,497
' 2,879,563
Winter _____________ .._ Nov. 11, 1958
Ewing _____ ____ _______,_ Mar. 31, 1959
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