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Патент USA US2406554

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,f Aug. 27, 1946.
v2,406,554
K. MARSH
HEATING METAL BODIES PREPARATORY TO HOT WORKING'l
Filed nec'.> '28, 194s
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INVENTOR
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BY
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ATTORNEY „
2,406,554
Patented Aug. 27, 1946
UNITED >STATES PATENT OFFICE
2,406,554
HEATING METAL BODIES PREPARATORY
TO HOT WORKING
Kirtland Marsh, Pittsburgh, Pa., assignor to Alu
minum Company of America, Pittsburgh, Pa., a
corporation of Pennsylvania
Application December 28, 1943, Serial No. 515,938
6 Claims. (Cl. 26S-»52)
1
_
2
mally treated, and Fig.r 2 illustrating a second y
.This invention relates to a process for heat
furnace equipment> in. which a redistributed
conditioning metal bodies of considerable mass,
particularly ingots, for hot working, and it is
hereinafter described in connection with the
treatment of ingots preparatory to hot rolling or
batch of ingots is further processed.
The nature of the preferred embodiment of the
present invention may be described in general
breakdown.
terms as including the steps of forming a mul
Y
tiple layer, stack or pile of the bodies or ingots
to be treated with a plurality of ingots in each
practice of processing ingots to bring them into
layer or row, introducing one or more of the
the desired metallurgical and thermal condi
tionsV for hot rolling 'is carried out by the well 10 piles into a soaking-preheating chamber held at
a predetermined temperature above working
known "soaking pit” procedure. This practice
temperature, subsequently` removing a pile o-f
has various known deficiencies and disadvan
To sustain a high output schedule, a common
tages; Among them may be mentioned the in
dividual handling of each ingot for removal from
the heating or combustion zone, the fluctuation
in pit temperature and waste of heat and fuel
upon removal of the covers to expose an ingot
ywhich it is desired to remove with consequent
deleterious effecten other ingots in the same
heat zone or pit but not yet removed, and espe 20
heated ingots from said chamber, transferring
all the ingots in the pile, in layers or in units,
successively to a second furnace, and introduc
ing the said layers of ingots into said second
furnace, utilizing residual heat in the îngots while
they are in the second furnace to cause equaliza
tion of temperature throughout each ingot rap
idly, and advancing the ingots through the sec
ond furnace intermittently to effect discharge
ciallythe lack of temperature equilibrium or uni
thereof for delivery to the mill as needed. The
formity in all parts of the ingots when they reach
temperatures employed in each of the respective
the mill for rolling, particularly as between the
furnace chambers will depend upon the char
interior and exterior portions thereof.
Itis among the objectives of _this invention to 25 acteristics of the metal being treated, and spe
ciñe.` temperatures need not be here mentioned
provide a process which overcomes the fore
as they are well known to the metallurgist, and
goingand other difficulties, which eliminates in
for-a given kind of metal the usual tempera
dividual` handling of the ingots being processed,
tures required to effect the desired results will
which results in maximum economy in the em
ployment of heat and maximum conservation 30 be utilized. Some bodies of alloyed metals prior
to initial hot working thereof require heating
of heat, and by which treated or processed ingots
to a temperature above hot working temperature
>of more «uniform thermal and metallurgical con
ditions are produced for hot working under such
and soaking at that elevated temperaturefor a
predetermined schedule as may be desired and
substantial length of time to improve the metal
lurgical characteristics, in addition to rendering
the metal readily workable. Among the charfacteristicsY so improved by heating and soaking
atpmaterially lower costs. A further object of the
invention is to provide an improved process
whereby a large number or multiplicity of ingots
may be heated up to and held at a predetermined
isl that of structural uniformity, i. e., the'heat
preheating and soaking temperature above the
ing causes some diffusion of alloy ingredients
working temperature to condition the same
in the base metal with consequent "diminution
metallurgically, >and thereafter rapidly vbringing
in size of brittle constituents that interfere with
the ingots to hot working or rolling tempera
properA Working of the bodies.
ture, effectively establishing temperature equilib
will bev particularly advantageous for thevtreat
rium, throughout each ingot in readiness for roll
ing, and holding them indefinitely in ready con
The invention p
ment of metal bodies or in’gots of such metal,
45
dition for delivery to the mill one by one as
aluminum alloys being a particular example.
` _In one mode of practicing the invention, and
needed. Other objects and advantages will be
come apparent «from the following description of
withïreference tothe drawing, a horizontal fur
nace 8 is provided, into the heating chamber of
which the ingots are charged and there heated
the invention.
By way of example, the accompanying draw .50 up to and held at a desired high temperature.
inglshows diagrammatically certain apparatus '
which may be employed in effecting the treat.
ment of ingots in accordance with the instant
invention, Fig. 1 illustrating a first furnace in
The construction of this furnace may take any
well known form. Preferably, it will have a heat,
ing chamber 9, spaced from the walls of the fur
nace-and adapted forforced circulation of the
which a plurality of batches of ingots are ther 55 furnace atmosphere by means of `suitable` cir
5
2,406,554
severalingots removed from thelpit and in vari
ous stages of cooling down to working .tempera
ture inrorder to meetfthe'mill 'requirements for
successive ingots„and in case ofinterruptions the
ingots removed from >therpit become too cold and
must-ibe reheated. Moreover, it will be apparent
that the ingots-after the steps of initial thermal
conditioning andcharg'ing into rthe holding fur
‘given hot working'temperature whichcomprises,
introducing a .batch of said bodies intoL a furnace
heated to a temperature above said working` 17em-`
perature, heating and soaking said bodies in said
f.urnace,'withdrawing the batchv of heated bod
nace I5 are brought to a more uniform tempera
ies from said furnace, charging all'A the bodies
constituting said batch in -spaced relationship
intoLa second furnace normally maintained sub
stantially at said working temperature, for sub
ture throughoutby- reason- of the equalizing ac
l10 sequentv discharge therefrom'one‘at atime, as
tion that takes plac'einthe holding furnace prior
to delivery for working, whereby the temperature
Vof each ingot and the average or mean tempera
ture of al1 the ingots are caused to be brought
needed for working, allthe bodiesin said-second
furnace being held substantially at said work
ing temperature until discharged therefrom, and
imparting intermittent movement to the said
into a greater degree of uniformity, which mani 15 bodies in said second furnace to discharge one of
fests itself in the working operation subsequently
them.
3. The method of treating cast metal alloy bod
performed. In the processing of metal bodies or
ies preparatory to initial hot working at a given
ingots of certain kinds of metal, it may be ad
hot working temperature which comprises, intro
vantageous to provide a non-oxidizing or inert
atmosphere in the holding furnace I5 if desired. 20 ducing a batch of said bodies into a furnace
heated to a temperature above said working tem
It is preferred to discharge all of the ingots
perature, heating and soaking said bodies in said
from the holding furnace I5 before introducing
furnace, withdrawing the batch of heated bodies
another batch thereinto, so that temperature
from said furnace, charging all the bodies `con
conditions therein can be more readily main
stituting said batch in spaced relationship into a
tained uniform and fluctuations and heat losses
second furnace normally maintained substan
kept to a minimum, and crosswise ingot dispo
tially at said working temperature, for subse
sition enables a furnace and its conveyor mech
quent discharge therefrom one at a time, as
anism of greatly simpliñed construction to be
employed, Accordingly, it is preferred to provide
needed for working, all the bodies in said second
at least an additional holding furnace 25, in all 30 furnace being held substantially at said Working
temperature until discharged therefrom, impart
respects a duplicate of the furnace I5, arranged
to'discharge its ingots to the runway or roller
ing intermittent movement to the said bodies in
said second furnace to discharge one of them,
table 22, so that uninterrupted iiow of ingots
similarly charging all the heated bodies of an
to the mill can be accomplished. This furnace
other batch into a third furnace identical to said
25 will be charged with an entire pile or batch
secondfurnace during discharge of bodies from
of ingots from the soaking-preheating furnace
the latter, and effecting discharge of bodies from
8 while the mill is being supplied with ingots from
said third furnace after al1 the bodies have been
the furnace I5. After the supply of ingots is
discharged from said second furnace.
exhausted from furnace I5 delivery of fully proc
4. The method of preparing cast metal alloy
essed ingots from the furnace 25 is effected. A 40
bodies for initial working at a given hot Working
suiiicient number of furnaces 8 will be used to
temperature which comprises, introducing a load
supply batches of ingots to the holding furnaces
consisting of a multiplicity of said bodies ar
I5 and 25, alternately, to meet the predetermined
ranged in spaced piled relation into a furnace,
schedule or requirement of the mill. The dis
charge of ingots from the respective holding fur 45 heating said load to and soaking the same at a
temperature higher than said working tempera
naces may be under control of the mill operator.
ture to effect metallurgical conditioning thereof,
Since each of the ingots as discharged from one
removing the load after soaking is completed, ef
of the holding furnaces is in required rolling con
fecting rearrangement of the said bodies of said
dition thermally and discharge thereof is effected
only as needed at the mill, there is eliminated 50 load and introduction thereof into a second fur
nace without reducing the mean temperature of
by this invention that interdependency between
said bodies materially below said working tem
the operation of the‘mill and the operation of
perature, equalizing the temperature of said bod
associated pits extant in prior practices.
ies in said second furnace, prior to discharge
What is claimed is:
from
said second furnace, and imparting inter
55
1. A process for heat conditioning cast metal
mittent movement to said bodies in said second
bodies of an aluminum alloy and the like for ini
furnace to discharge them only as needed for
tial working at a given hot working temperature
Working.
comprising introducingv simultaneously into a
5. The method of preparing cast metal alloy
heating furnace a multiplicity of said bodies
removing said bodies from said furnace simul 60 bodies for initial working at a given hot working
temperature which comprises, introducing a load
ltaneously after bringing them to and maintain
consisting of a multiplicity of said bodies ar
ing them at a temperature greater than said
ranged in spaced piled relation into a furnace,>
working temperature to effect metallurgical oon
heating said load to and soaking the same at a
ditioning thereof, cooling said removed bodies in
‘ air, introducing all of said removed bodies into a 65 temperature higher than said working tempera
second furnace in side by side relation at an
average temperature about equal to said work
ture to effect metallurgical conditioning -thereof,
removing the load after soaking is completed,
effecting rearrangement of said bodies of said
ing temperature to check cooling thereof, effect
load and introduction thereof into a second fur
ing equalization of the temperature of said bod
ies in said second furnace at substantially said 70 nace without reducing the mean temperature of
said bodies materially below said working tem
working temperature, and moving said bodies
perature, equalizing the temperature of said
through said second furnace to discharge them
bodies in said second furnace primarily by the
one at a time.
,
2. The method of treating cast metal alloy
residual heat in each of them, prior to discharge
> bodies preparatory to initial hot working at a 75 from said second furnace, and imparting inter
2,406,554 '
7
mitteilt `ìnovement ïtojsaid .bodies Lin said ‘second
l furnaoe ftov :discharge 'them only as :needed Afor'
‘
working`
6.
'
'
.
process :for `heat oondíti'oningiingots con
taining alloying¿constituents for working at za
@Non h'o't lworking ’temperatnrel comprising ar-'omging iiëngots in' a pile yin ysuperposed, crossed
ï layers
¿the ìn'gots :in leach .layer :spaced yfrom
3eä‘oh tother», Vvintroduciïrzlg ¿the pile 4into a heating
y8
perature to Yeiïec‘t metallurgical ¿conditioning
thereof, ivremoving Lthe .pi-'1e :of lingots .from .said
furnace after soaking is completed, removing the
layers vìoiîï'th‘e fpil'e 1in Asuccession, -and introducing
themrìnto *a second iurnace in a single'rlayeriin
spaced irela'tion‘ship, maintaining ysaidiingots .in f
said second .furnace `at 4a. ¿temperature substanè
tialiy» equal to zsaidrworking temperature, and'> Y
moving îsaid ingots through said second furnace
` chairmen-‘heating vi',1‘1e.irrgfots "to and soaking them 1-0k to >disohancge :them one ata time.
2 'at fa temperature higher/‘than said Working tem
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