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Патент USA US2405221

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c. A. M A N N
`METHOD 'AND APPARATUS FOR IMPREGNATING `STRIP STOCK
Filed April 3, 1944
ATTORNEYS
Patented Aug. 6, 1946
, 2,405,221
UNITED vstares PATENT orifice
2,405,221
METHÜD AND APPARATUS FOR IMPREG
NATING STRIP'STOCK
Cecil A. Mann, Dayton, 0hio, assignor to General
Motors Corporation, Detroit, Mich., a corpora
tion of Delaware
Application April 3, 1944, Serial No. 529,324
"
1
7 Claims.
(o1. 117-119)
Y
This invention relates to a method and appa
ratus for continuously applying soft or lower
melting point metal to the surface of a metallic
strip, and is more particularly concerned with
the method and apparatus for continuously ap
plying and simultaneously impregnating porous
metallic strip material with a lower melting point
metal.
'
2
44 respectively. When the level of babbitt ex
ceeds the level -of the weirs, the excess babbitt is
drained back to a supply tank 46 through con
duits 48 and 50 respectively. A supplytank 46
contains a substantial volume of babbitt 40 and
also is provided with heating means, not shown,
for maintaining the babbitt in the molten condi
tion.
‘
An object of the invention is to provide a
In order to supply babbitt to chambers 22 and
method and apparatus whereby porous strip mae
26, the supply tank 46 is provided with two pumps
terial or composite strip material which includes
52 and 54 respectively. These pumps convey
a porous metal layer thereon may be continu
babbitt
from supply tank 40 upwardly through
ously impregnated under' sub-'atmospheric con
supply
conduits
56 and 58 to chambers 22 and» 26
ditions.
respectively. The pumps 52 and 54 have suñîlcient
In carrying out the‘above object, it is a still 15 pumping capacity to always maintain an excess
further object of the invention to carry out the
of babbitt ilowing into the chamber so that there
vacuum impregnating step while the strip ma
is always a return of babbitt through conduits 48
terial is substantially in the ilat condition.
and 56. It is also apparent that there will be a
This applicationis a continuation in part of
leakage of babbitt around the entrance 32 and
my copending application, Serial No. 376,512, di 20 exit 38 of the apparatus, which babbitt is likewise
rected to a method and apparatus for appli/insr
suitably conveyed back to the supply tank 46.
molten metal on strip stock. This application is
The intermediate chamber 24 is evacuated by
directed to somewhat similar subject matten-but
means of a vacuum pump 66 which cooperates
is modified with particular respect to the Vacuum
with the second pump 62 that is immersed in the
impregnating step and apparatus whereby the 25 babbitt
supply, Pump 62 is utilized to return
apparatus is simplified to some extent. »
»
babbitt leaking into the vacuum chamber 24
Further objects and advantages of the present
through openings 34 and 36. Thusthe pump 62
invention will be apparent from the following de
while pumping babbitt into the supply tank 46
scription, reference being had to the accompany-4
also induces a vacuum on the intake side thereof
ing drawing wherein preferred embodiments of 30 which cooperates with pump 60 to produce a very
the present invention are clearly shown.
high vacuum in the chamber 24.
,
In the drawing:
It is preferable to supply a reducing gas to
The drawing shows a diagrammatic View of a
chambers 22 and 26 to maintain as clean a con
vacuum impregnating apparatus showing the
dition as possible on the surface of the babbitt
various pumps and conduits with a strip being 35 whereby oxidation is reduced, if not eliminated.
run therethrough.
This lessens the amount of sla-g formed and elimi
Referring particularly to the drawing, a vac
nates the possibility of clogging of the pumps.
uum impregnating apparatus is“ shown at 20
In this instance the supply tank 46 is closed to
which includes an elongated tunnel-like structure
the atmosphere and may either be supplied with
broken ldown into three main sections7 namely, 40 a reducing atmosphere thereover or the molten
the ñrst section 22, a vacuum chamber 24 and a
babbitt may be protected by flotation cf a re
third section 26. Sections 22, 24 and 26 are
fractory material such as bentonite en the sur
aligned and contain entries and exits so that a
face thereof.
'
strip 30 may pass therethrough in a substantially
The pumps 60 and 62 maintain a pressure of
ñat condition. Strip 36 enters chamber 22 45 about 2 to 3 mm. of Hg abs. in the vacuum cham
through an entrance 32 and leaves through an
ber. Reducing atmosphere is admitted to this
opening 34 which is an entrance to the vacuum
chamber through conduit 63 in suiìcient quan
chamber 24. It then passes through the Vacuum
tity to bring the pressure in the Vacuum chamber
chamber and leaves said chamber through exit
to about 7 mm. of Hg abs. The reducing atmos
36 which is the entrance to chamber 26. Finally 50 phere prevents any oxidation of the babbitt in
the strip passes out of chamber 26 through exit
this chamber.
.y
38
In operation, the device is similar to the device
.Chambers 22 and 26 contain a predetermined
volume of molten metal 46, in this case babbitt,
the height of which is controlled by weirs 42 and
shown in my copending application, Serial No.
376,512. Strip 36 enters the apparatus through
55 the entrance 32, having ñrst had the surface
2,405,221
3
4
leakage into the vacuum chamber and out of the
thereof cleaned of any oxidation, dirt or grease
machine, and means cooperating with said ñrst
by means of a suitable fluxing apparatus, several
mentioned means for partially evacuating said
embodiments of which are shown in my copend
vacuum chamber and for returning the impreg
ing application above referred to.
The strip 3i) includes at least a portion thereof Ul nant which leaks out of said throat portions to
said supply tank.
of porous material which requires impregnation.
2. In a machine for continuously impregnating
The strip enters under the surface of the babbitt
porous strip material in the substantially nat con
4D in chamber 22 and partial impregnation is
dition, an impregnating chamber including throat
obtained. This portion of the strip then pro
portions at either end thereof for restricting the
gresses into the vacuum chamber Where any gasY
flow of impregnant therefrom around a strip pass
remaining in the pores escapes due to the rare
ing therethrough, a communicating vacuum
faction of the atmosphere thereover. This causes
chamber at the egress end of said first chamber,
an impregnating of the babbitt into the pores to
means for partially evacuating said vacuum
replace any gas which Was evacuated therefrom.
chamber, and a second impregnating chamber
This portion of the strip then progresses into the
chamber 25 where it enters under the surface of
the babbitt, and additional babbitt is thereby sup
plied to complete the impregnation. The strip
then passes out of the exit 3B into a suitable cast
connected with the egress end of said vacuum
chamber and including throat portions at either
end thereof for restricting the now of impreg
’ nant therefrom around a strip passing there
ing apparatus, not shown, but described in detail 20 through, a supply tank for containing the im~
pregnant, pump means for pumping impregnant
in my copending application Serial No. 376,512.
to each of said impregnating chambers said pump
'I‘hiscasting apparatus permits any desired thick
ness of babbitt to be cast on the strip,V but forms
no part of the present invention.
It is manifest fromY the foregoing that a com- .
plete impregnationA can be obtained in this ap
paratus without any bending of the material'.
This is particularly necessary when operating on
heavy strips Where the cross sectioned area of the
strip is such as to make bending difñcult or im- »
possible. The entire operation therefore is car
ried out continuously While the strip remains in
means having sumcient capacity to maintain a
defined level of impregnant in each of said cham
bers above the level of said strip regardless of
the leakage into the vacuum chamber and out of'
the machine, means cooperating with said ñrst
mentioned means _for partially evacuating- said
vacuum chamber and for returning the impreg
nant which leaks out of said throat portions to
said supply tank, said last named means being
immersed in said impregnant, supply means for
providing a reducing atmosphere over the im
pregnant in said two end chambers and for pro
a flat condition> moving in a single plane.
It will be noted that the use of pump S2 elimi
nates the necessity of the sump and barometric 35 viding a measured predetermined pressure of re
ducing atmosphere in said vacuum chamber.
3. An apparatus for continuously impregnat
in that the intake side of the pump balances the
ing metallic strip material including a porous
vacuum in chamber 2d so that pump 62 cooperates
metal layer thereon, said material being in a sub
with pump 69' to produce the desired vacuum.
Furthermore pump 62 has the additional func 40 stantially flat condition during the imp-regnation
tion of removing the babbitt from the vacuum
thereof, comprising in combination; a babbitt
chamber which babbitt has flowed or leaked
chamber adapted to be partially filled with bab.
therein from chambers 22 and 25 in returning
bitt through which said strip may» pass and in
same to the supply tank G5.
cluding Ythroats at either end thereof Which
It is manifest that in place of babbitt any
closely lit the strip as it passes into and out of
other lower melting point metal may be utilized,
said chamber; a communicating chamber at the
lead, tin, antimony, aluminum, or alloys thereof
egress end of said ñrst chamber adapted to be
may all be used with porous strips having a higher
evacuated; means for partially evacuating said
melting point whereby substantially complete im
communicating chamber, a third chamber at the
pregnation is possible.
egress end of said second chamber and including
While the embodiments of the present invention
throat portions at either end thereof, said third
as herein. disclosed, constitute preferred forms, it
chamber also being at least partially filled with
isl to` be understood that other forms might be
molten babbitt; a heated supply tank for holding
leg utilized in my copending application 376,512
adopted, all c-oming Within the scope of the claims
55 an adequate supply of molten babbitt metal there
which follow.
1n; pump means connected with said supply tank
lVhat is claimed is as follows:
and with said ñrst and third mentioned chambers
l. In a machine for continuously impregnating
for maintaining the level of babbitt in- said ñrst
porous strip material in the substantially flat con
and third> chambers substantially constant and
dition, an impregnating chamber including throat
above the surface of the strip, whereby the molten
portions at either end thereof for restricting the 60 babbitt maintains a vacuum seal at the egress end
now of impregnant therefrom around a strip pass
of the said first chamber and. at the egress end
ing therethrough, a communicating vacuum
of said second chamber; return means connected
chamber at the egress end of said ñrst chamber,
with said ñrst and third chambers for returning
means for partially evacuating said vacuum
chamber, and a second impregnating chamber
connected with the egress end of said Vacuum _
chamber and including throat portions at either
end thereof for restricting the iiow of impregnant
therefrom around a strip passing therethrough,
a supply tank for containing the impregnant,
pump means for pumping impregnant to each
of said impregnating chambers, said pump means
having suñicient capacity to maintain a defined
level of impregnant in each of said chambers
abovelthe level >of isaid’strip regardless of the
65 excess babbitt to said supply tank, a second evac
uating means for partially evacuating said com
mimica-ting chamber, said last means also having
the dual function of pumping babbitt fromv the
communicating chamber to said supply tank, said
two means. for'partially evacuating the communi
eating chamber cooperating to produce the> de-V
sired vacuum therein, and means for supplying a
reducing atmosphere to said iirst and third cham'
bers and a measured .quantity ofrreducing at~
mcsphere to said communicating chamber said
5
2,405,221
quantity being predetermined so as not to re'
duce the vacuum appreciably.
4. «An apparatus as claimed in claim 3 wherein
weirs are provided in said ñrst and third cham
bers to maintain the desired level of babbitt
6
chamber connecting said impregnating chambers,
all of said chambers being in substantially the '
same horizontal plane and so constructed that f
leakage can occur from said impregnating charn
bers into said vacuum chamber around said strip,
therein.
passing said strip through' al1 of the chambers
5. An apparatus as claimed in claim 3 wherein
in substantially flat and unbent condition and in
heating means are included in said ñrst and third
a single horizontal plane and beneath said im
chambers for maintaining the babbitt in a molten
pregnant in said impregnating chambers, sup
condition.
10 plying sufficient impregnant to each of said im
6. An apparatus as claimed in claim 3 wherein
pregnating chambers to maintain the level of
said ñrst chamber includes a ñxed Weir for main
molten metal constant so that the impregnant
taining a defined level of babbitt therein and
leakage from said impregnating chambers into
wherein said third chamber includes an adjust
said Vacuum chamber is compensated for by the
able Weir whereby the babbitt level in said third
new irnpregnant being supplied into said cham
chamber may be maintained at any desirable
bers whereby a seal is maintained between said '
depth.
chambers and said vacuum chamber and finally
'7. In a' method of continuously impregnating
removing said leakage from said vacuum cham
porous metal strip material in a substantially flat
ber whereby the evacuation from said chamber
condition, the steps comprising: providing two im 20 is
at least partially accomplished by removal of
pregnating chambers containing molten impreg
nating metal, providing an intermediate vacuum
said impregnant therefrom.
CECIL A. MANN.
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