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Патент USA US3077023

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Feb. 12, 1963
R. G. DlsHMAN
3,077,013
METHOD AND APPARATUS FOR` CENTRIFUGAL~ CASTING 0F PIPE
Filed Aug'. 4, 1960
4 Sheets-Sheet l
Feb. l2, 1963
R. G. DlsHMAN
3,077,013A
METHOD AND APPARATUS FOR CENTRIFUGAL CASTING OF PIPE
Filed Aug. 4. 1960
4 Sheets-Sheet'I 2
"
l
50
50
INVENTOR.'
RUSSELL G. DlSHMAN
ATTORNEY
Feb. 12, 1963
3,077,013
R. G. DxsHMAN
METHOD AND APPARATUS FOR CENTRIFUGAL CASTING 0F PIPE
4 Sheets-Sheet Z;
Filed Aug. 4. 1960
Sw
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o.
IN VEN TOR."
RUSSELL. G. DISH MAN
BY -`
g
j
*ÉL
AT TOR N EY
Feb. 12, 1963
R. G. DlsHMAN
3,077,013
METHOD AND APPARATUS FOR CENTRIF'UGAL CASTING OF PIPE
Filed Aug. 4, 1960'
4 Sheets-Sheet 4
I2T»
INVENTOR.' V
FIG11
13FIG.
Russ E|_|_ G. DISHMAN
BY"
ATTORN EY
se
itâ@
'Patented lieb. l2, lääël
E
FIG. 13 is a view similar to FIG. ll with the mandrel
in expanded position.
3 @'77 @13
f‘slsll) AE’PAÍÉATUUS FÜR CEN'ÑMFUGÀL
HG. 14 is a transverse cross sectional view talren along
the line lLl--ld in FlG. i3.
Referring now more in detail to the drawings, the ap
paratus shown for purpose of illustration comprises a
CÀSî‘llsl‘G (lll FHU'E
lìislnnan, Anniston, Ala., assigner, by mesne
tents, to United States Pipe and Foundry @Conn
pany,
ns, Ala., a corporation of New .lersey
stationary base trame lil supportino a pair of parallel
shafts Il, il" which are rotatably journaled in bearings
l2, l2', respectively. Each of the shafts llt, ll.’ car ies
invention relates to a method and apparatus for 10 a pair of trannie-rt Wheels i3, i3', respectively, which
" - I
£1-, i960, Ser. No. $7,541
Qlainis. (Si. 22--l7)
the centrifugal casting of pipe. More particularly, this
invention relates to a method. and apparatus including an
cradle a hollow tubular ilask ld. rîhe flask lli is pro
vided near its center with a circumferential guide ring l5
expansibde mandrel used in conjunction with a spun flask
which is received between the ila-nges or" guide Wheel lo
secured to shaft il to prevent longitudinal shifting of the
for the centrifugal forming of pipe molds and the centrif
15 Ílask. Also secured to shaft il is a pulley il' which is
ugal casting ot the pipe.
driven by a belt lâ running over a pulley on the motor
Heretoiore, heavy Íorrn bars have been used, but only
3.9. Hold-down straps 2d, Ztl’ provided with rollers 2l,
a limited num‘er of sizes could be made with the heavy
2l', respectivel‘ , are releasably fastened to the base
form bar, Whereas according to my method and with my
frame lll by bolts 22, £2', respectively.
apparatus centrifugal force is employed to expand the
An auxiliary stationary frame 23 is positioned ad»
mandrel. 'lne llaslt is normally maintained in horizontal 20
jacent the stationary base frame l@ and has rails 2li, 24'
position, thus accomplishing better results in less time
thereon upon which ride the wheels 25» of a movable
than was heretofore required, but for lining purposes,
specifically with green sand, it may be placed in the ver
carriage 26 which rotatably supports the mandrel 27 in
tical position.
bearings 23, 23’ so as to position the mandrel 27 in axial
alignment with the liasl: le so as to be moved in and
out of the llasl’. upon movement of the carriage Z5 on the
rails 124i», 2d’. Motor 29 mounted on the auxiliary sta
An object of my invention, therefore, is to provide a
method and apparatus utilizing centrifugal force to assist
in shaping the mold.
Another obiect or" my invention is to provide quick ad
justing mechanism to obtain and maintain ‘aroper size.
Another object of my invention is to provide apparatus 30
tionary frame 23 is arranged to rotate the mandrel 27 by
which is simple in design, rugged in construction and
is freely rotatable in bearings 3'?, 37'. The movable
carriage 35’ is held in adjusted position by clamping means
means of belt 3@ trained over pulley 31 which is fixed to
the mandrel El’.
At the opposite end of the llask le is a movable frame
which does not need to be of heavy construction to main
32 supported on Wheels 33 which ride on rails 3d, 343’
tain proper alignment.
for movement normal to the axis of the iiask lli. On top
Another object or” my invention is to provide a method
of the movable frame 32. is a movable carriage 355 slid
and apparatus which is faster and more convenient in
operation, and which produces better and more uniform 35 ably mounted for movement on the movable trarne 32
in a direction parallel to the axis of flask llt. The mov
results.
able carriage 35 mounts an alignment shaft 35 which
Another object of my invention is to provide apparatus
meets the demands of economic manufacture.
The alignment shaft 3a carries a mold former 39
Gtlier and further objects and advantages of my in 40
for either a hub or a spigot end, here shown as a spigot
vention will be obvious from the following specification
end so that when the movable frame 32 is moved on the
in conjunction with the accompanying drawings
rails 3ft, 3e' to bring the alignment shaft 36 into axial
wherein like characters of reference designate the same
alignment with the mandrel 2’7 in the ilask. le, the movable
or similar parts throughout the several views, and in
45 carriage 35 can be adjusted on the frame 32 to insert
winch:
the mold former
into the adjacent end of the ilasle
FiG. l is a side elevation of apparatus for the centrif
lll- and mate the end of alignment straft Slt? with the ad~
ugal basting of pipe according to my invention.
jacent end of the mandrel 2"? so as to maintain the mandrel
FIG. 2 is a top plan View, on an enlarged scale, partly
in cross section, showing the central portion of the apparatus disclosed in PEG. l.
FlG. 3 is a cross sectional view taken along the line
in centered position with respect to the llaslt ld when
the mandrel is driven by motor 29.
Hub forming blades dll, fil" are attached to the mandrel
5_3 in
l.
F G. 4 is a cross sectional view talren along the line
which are recessed in the mandrel
2'? by means of adjusting bolts dl, dl', respectively,
and are loaded bv
springs dit, dit', respectively, to urge the blades dit, dll’ in
` ’ï l.
a top plan vieuI of the end portions of the 55 toward the mandrel, as shown in Fl'GS. ll-l2, but ner
A
rnit outward movement of the blades de“, 4G', as shown
.tus shown in HG. 1.
in FlGS. 1344, in response to centrifugal force when
the mandrel is rotated.
Also carried by the mandrel 2'7 are a plurality of elon
tsr-G. 6 is an enlarged View ot the llasl; with parts
away to show the cores and the pipe cast therein.
J. 7 is a longitudinal cross sectional view of a detail
'ng the tiasl: with the mandrel tbeein in contracted 60
forrning blades
’3 C91.
.fired by adjusting
ons ¿zh-t, dus , respectively, which. are recessed 1n the man
'» nal view taken along
. 9
a view similar to FIG. 7, but showing the
in
expanded position.
i9 is a transverse cross sectional View taken
rs
rio.
l is a longitudinal cross sectional View or" an
end portion of the ilaslr showing the hub forming portion
of the mandrel in contracted position.
HG. l2 is a transverse cross sectional view taken along
the line
in FlG. ll.
drel 27 and are loaded by springs dä, ¿l5 , respectively, to
urge the blades
43’ in toward the mandrel 27 when the
mandrel is at rest but will permit movements of the blades
65 d3, 43’ outwardly in response to centrifugal force when
the mandrel 27 is rotated.
rlîhe bolts 4l, di’ are provided
with self-locking adjusting nuts ed, do', for adjustment of
the outward movement of the hub forming blades lill, ¿ltl’
in response to centrifugal force; and the barrel forming
blades d3, 43' are provided with adi-usting bolts fr'/ hav
ing self'locking nuts 47’ thereon for adjustment to limit
` the outward movement or" the barrel forming blades in
aureola
u
response to centrifugal force, this adjustment being preset.
steps of forming a mold in a flask within which metal is
cast comprising rotating said flask about an axis, intro
ducing mold material into said flask for the formation of
said mold within said flask, positioning a blade axially
The openings 52 and 52' are made sand tight by inserting
a piece of wool felt cut to shape and glued into place.
ln the performance of my method, the flask 2.4i is heated
to approximately 300° F. by any convenient means, such
as portable torches (not shown) which can be inserted
in either end of the flask.
ness of the mold to be formed and smoothing the inner
Then when the flask has been heated, a resin-sand mix
ture is placed on the mandrel in the space between the
periphery of said mold by yieldably moving said blade
radially outwardly toward the inner periphery of said
within said pipe and initially spaced from the inner pe
riphery of said tlasl; by a distance greater than the thick
forming blades, and the mandrel is then inserted into 10 flask a predetermined distance as said flask is rotated.
the flask by movement of the carriage 26. The chuck or
2. in a method for the centrifugal casting of pipe, the
alignment shaft 3o is then moved into alignment with the
steps of forming a mold within which metal is cast com
mandrel Z7 and adjustably positioned by movement of the
prising heating a ilask, rotating said flask about an axis,
carriage 35 so as to mate the alignment shaft or chuck with
introducing mold material into said flask for the forma
the mandrel. The preheated flask lid is then rotated in
tion of said mold within said flask, positioning a blade
one direction by the motor ‘i9 at about 6GB rpm., and then
axially within said pipe and initially spaced from the ín
rotation of the mandrel Z7 is commenced in the opposite
ner periphery of said flask by a distance greater than the
direction at about the same speed so as to cast the resin
'thickness of the mold to be formed and smoothing the
sand mixture onto the inside of the flask and smooth it
inner periphery of said mold by yieldably moving said
out by the expanding mandrel, the blades of which are
blade radially outwardly toward the inner periphery of
thrown outwardly by centrifugal force to push and com
said flask a predetermined distance as said flask is ro
press theresin-sand or other mold material into the proper
tated, and by rotating said blade in a direction opposite
shape. After the mold material has been formed into
the direction of rotation of said flask during the movement
the desired shape within the flask, the mandrel is with
of said blade radially.
drawn from the flask and the chuck removed from the 25
3. In a method for the centrifugal casting of pipe, the
other end of the flask preparatory to» casting the pipe.
steps of forming a mold within which metal is cast com
As an alternative to the use of the mandrel herein
prising a tubular flask, rotating said flask about an axis,
described, I have found that the resin-sand mixture may
blowing mold material into said flask for the formation
be blown into the preheated flask while it is being rotated
or" said mold within said flask, positioning a blade axially
at about 1000 rpm. to coat the inside of the heated flask 30 within said pipe and initially spaced from the inner pe
and provide a smooth even coating all around the inner
riphery of said flask by a distance greater than the thick
periphery, the blast being such that to insure an even
ness of the mold to be formed and smoothing the inner
coating throughout the length or" the flask an excess of
periphery of said mold by yieldably moving said blade
material is used which passes through the flask and out the
by centrifugal force radially outwardly toward the inner
opposite end.
35 periphery of said flask a predetermined distance as said
Having formed the mold inside the flask, as above de»
flask is rotated and by rotating said blade in a direction
scribed, dry sand cores 48, .49 are inserted into the ends
opposite the direction of rotation of said flask during
of the flask and fixed in place by means of tapered lock
the movement of said blade radially.
pins 50 or any other suitable securing means. Elben, While
4. In a method for the centrifugal casting of pipe, the
the flask is still warm, to avoid chilling the metal, the 40 steps of forming a mold within which metal is cast com~
pouring horn (not shown) of prior art construction is
prising heating a tubular ñask, rotating said flask about
moved into place and While the flask is being rotated at
an axis, introducing mold material into said flask for
about 1000 r.p.m., depending somewhat upon the size of
the formation of said mold within said ñask, positioning
the pipe to be cast, a predetermined amount of molten
a convex blade having a curvature corresponding to the
metal is poured for the casting, and the rotation of the 45 curvature of said flask axially Within said pipe and ini
flask is continued until the molten metal solidiiies upon
tially spaced from the inner periphery of said flask by
partial cooling, whereupon the bolts 22, 22’ are loosened
a distance greater than the thickness of the mold to be
or withdrawn to permit release of the flask 11i from under
formed and smoothing the inner periphery of said mold
the hold-down yokes 26, 20’ and then the
ifi» with
by yieldably moving said blade by centrifugal force
the casting therein is removed from the trunnion wheels 50 radially outwardly toward the inner periphery of said
13 and another flask is set in place.
flask a predetermined distance as said flask is rotated and
ln addition to the resin-dry sand mold, this apparatus
then returning said blade to its initial position.
also lends itself to the making of green sand molds. Ac
5. In a method for the centrifugal casting of pipe,
cordingly, a measured amount of sand is placed in the
the steps of forming a mold within which metal is cast
flask while it is either rotating or at rest. The flask is
comprising a tubular flask, rotating said flask about an
then set in fast rotation initially to pack the sand by cen
axis, introducing mold material into said flask for the
trifugal force. rïhe expansible blades are then inserted
formation of said mold within said flask, positioning
and set in counter-rotation to the flask, which further packs
opposed convex blades axially within said pipe and ini
and imparts a definite form to the sand. After placing
tially
spaced from the inner periphery of said flask by
the hub cores dâ and 49 in position, it is ready for spin 60
a
distance
greater than the thickness of the mold to be
ning and pouring. A thin resin lining can then be blo-wn
into the green sand mold and a portable burner used to
cook the thin lining in just a few seconds. The net result
is a casting that requires little or no cleaning. The green
formed and smoothing the inner periphery of said mold
by simultaneously yieldably moving said blades by cen
trifugal force radially outwardly toward the inner pe
51’ are part of the flask itself. The spigot end or second
hub cannot be formed on account of being unable to
is rotated by rotating said blades in a direction opposite
the direction of rotation of said flask.
sand lining is designated by 5l, 5l’. in resin lining, 5i, 65 riphery of said flask a predetermined distance as said flask
withdraw it. Conversely, it would be a plain end pipe.
Having thus described my method and apparatus, it
6. Apparatus for the centrifugal casting of pipe in
either the spirit or scope of my invention as defined in the
flask for securing the flask in position for rotation, an
expansible mandrel supported for rotation in axial align
cluding a hollow tubular flask mounted for rotation
will be obvious to those skilled in the art that many modi 70 about its longitudinal axis, means operably connected to
rotate said flask, hold-down means passing over said
fications and changes can be made without departing from
appended claims.
l claim:
1. In a method for the centrifugal casting of pipe, the
ment with said flask and movable in and out of the flask
at one end thereof, alignment means mounted for move
5
3,077,013
6
ment into and out of engagement with said mandrel at
force, means urging said blades inwardly against cen
trifugal force, and means for limiting outward movement
the opposite end of said flask, means for continuously
rotating said mandrel about its longitudinal axis, said
of said blades beyond a predetermined distance.
mandrel including an elongated body and a forming blade
10. Apparatus for the centrifugal casting of pipe in
mounted on said body for outward movement in response
cluding a base frame, a pair of parallel shafts rotatably
journaled in said frame, a plurality of trunnion wheels
to centrifugal force, means urging said blade inwardly
against centrifugal force, and means for limiting outward
on each of said shafts for cradling a flask, a hollow tu
bular flask cradled on said trunnion wheels for rotation
about its longitudinal axis, means operably connected to
movement of said blade beyond a predetermined distance.
7. Apparatus for the centrifugal casting of pipe includ
ing a plurality of trunnion wheels for cradling a flask, a 10 at least one of said shafts for at least certain of said
hollow tubular flask cradled on said trunnion wheels for
trunnion wheels to rotate said flask, hold-down means
rotation about its longitudinal axis, means operably con»
releasably secured to said frame and passing over said
nccted to at least one of said trunnion wheels to rotate
flask for securing the flask in position for rotation by
said flask, hold-down means passing over said flask for
said trunnion wheels, means operatively associated with
securing the flask in position for rotation on said trunnion 15 said flask to prevent longitudinal shifting of said flask,
wheels, an expansible mandrel supported for rotation in
an expansible mandrel supported for rotation in axial
axial alignment with said flask and movable in and out
alignment with said flask and movable in and out of tbe
of the flask at one end thereof, a freely rotatable align
flask at one end thereof, a freely rotatable alignment
ment shaft mounted for movement into and out of
engagement with said mandrel at the opposite end of
shaft mounted for movement into and out of engage
ment with said mandrel at the opposite end of said flask,
means for rotating said mandrel about its longitudinal
axis, said mandrel including an elongated body and a
plurality of forming blades mounted on said body for
outward movement in response to centrifugal force,
spring means urging said blades inwardly against cen
trifugal force, and adjustable means for limiting outward
movement of said blades beyond a predetermined dis
said flask, means for continuously rotating said mandrel
about its longitudinal axis, said mandrel including an
elongated body and a forming blade mounted on said
body for outward movement in response to centrifugal
force, spring means urging said blade inwardly against
centrifugal force, and means for limiting outward move
ment of said blade beyond a predetermined distance.
8. Apparatus for the centrifugal casting of pipe in
tance.
cluding a plurality of trunnion wheels for cradling a
11. Apparatus for the centrifugal casting of pipe in
flask, a hollow tubular flask cradled on said trunnion 30 cluding a hollow tubular flask mounted for rotation
wheels for rotation about its longitudinal axis, means
about its longitudinal axis, means operably connected to
operably connected to rotate said flask, hold-down means
rotate said flask, a mandrel supported outside said flask
releasably secured to said frame and passing over said
for rotation and extending into the hollow portion of
flask for securing the flask in position for rotation on said
said flask, means for rotating said mandrel, a blade
trunnion wheels, means operatively associated with said 35 means for yieldably mounting said blades on said man
flask to prevent longitudinal shifting of said flask, an
drel for movement toward and away from the inner pe
expansible mandrel supported for rotation in axial align
riphery of said flask, and means for urging said blades to
ment with said flask and movable in and out of the flask
ward said mandrel whereby when said mandrel is rotated,
at one end thereof, alignment means mounted for move
said blade is urged outwardly and upon termination of
40
ment into and out of engagement with said mandrel at
the mandrel rotation said blade is urged inwardly.
the opposite end of said flask, means for rotating said
l2. Apparatus for the centrifugal casting of pipe in
mandrel about its longitudinal axis, said mandrel in
cluding a hollow tubular flask mounted for rotation
cluding an elongated body and a forming blade mounted
about its longitudinal axis, means opcrably connected to
on said body for outward movement in response to
45 rotate said tlask, a mandrel supported outside said flask
centrifugal force, spring means urging said blade in
for rotation and extending into the hollow portion of said
wardly against centrifugal force, and means for limiting
flask, means for rotating said mandrel, blades yieldably
outward movement of said blade beyond a predetermined
mounted on said mandrel for movement toward and away
distance.
from the inner periphery of said flask, and means for
9. Apparatus for the centrifugal casting of pipe iri 50 urging said blades toward said mandrel whereby when
cluding a hollow tubular flask mounted for rotation about
said mandrel is rotated said blade is urged outwardly
its longitudinal axis, means operably connected to rotate
and upon termination of the mandrel rotation said blade
said ñask, an expansible mandrel supported for rotation
is urged inwardly.
in axial alignment with said flask and movable in and
References Cited in the file of this patent
out of the flask at one end thereof, alignment means
mounted for movement into and out of engagement with
said mandrel at the opposite end of said flask, means
55
operably connected to rotate said mandrel about its
longitudinal axis, said mandrel including an elongated
body and a plurality of forming blades mounted on said 60
body for outward movement in response to centrifugal
UNITED STATES PATENTS
1,110,282
1,504,497
1,573,089
2,499,900
2,731,690
2,956,318
Askew ______________ __ Sept. 8,
Perry ______________ __ Aug. 12,
Rice ________________ __ Feb. 16,
Johnston ____________ __ Sept. 2l,
Coupland et al. _______ __ Jan. 24,
Hothorn et al _________ __ Oct. 18,
1914
1924
1926
1948
1956
1960
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