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Патент USA US2109470

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_ March 1, ‘1938.
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c, w_ DAKE
2,109,470
METHOD OF PRODUCING BRAKE DRUMS
Filed March 5, 1934
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INVENTOR
‘Bf/1421:: W DAKE
ATI'ORNEY
March 1, 1938.
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¢_w_ BAKE
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METHOD OF PRODUCING BRAKE DRUMS
Filed March 5, 1934
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INVENTOR
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March "1, 1938.
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METHOD OF PRODUCING BRAKE DRUMS
Filed March 5-, 1954
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INVENTOR
611M155 WD/l/ns ,
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w/MW
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ATTORNEY
‘2,109,470
Patented Mar. 1, 1938
UNITED STATES’ PATENT OFFICE‘
METHOD OF PRODUCIJNG BRAKE DRUMS
Charles W. Dake, Grand Haven, Mich, assignor '
to Campbell, Wyant '& Cannon Foundry Com
pany, Muskegon Heights, Micln, a corporation
of Michigan
Application March 5, 1934, Serial No. 714,089
18 Claims. (01. 29-1522)
This'invention relates to brake drums and, thin cylindrical metal tube suchas may be rolled
particularly, to a novel and economical method _ or drawn'or otherwise ‘formed to tubular shape.
Fig. 2 is a longitudinal section of the tube with
of producing brake drums for motor vehicles.
~ Such brake drums are employed, in conjunction ' its two ends ?anged inwardly to provide annular
5 with other braking mechanism for retarding and
stopping the rotative movement of wheels on
vehicles. The brake drums, of course, may be
used in many other relations, connected with ro
tating mechanism and utilized ‘by the applica
10 tion of a brake thereto to retard or stop such
mechanism.
‘
'
’
,
Brake drums of the character to be produced
by my invention’ should be of light weight but
resistant to fracture, readily conduct away heat
'15 generated by the, friction of brake shoes there
against, and of a character produced at a sum
ciently low cost‘to be practical and acceptable.
‘One important feature and object of the present
invention is to provide a method of producing
dams against molten metal escaping, from the
ends of the tube and'becoming fused vto the mold.
Fig. 3 is a transverse section of a'metal mold
for holding the tube ‘shown in Fig. 2, said tube
later to receive molten metal, preferably cast ,
iron.
,
Fig. 4 is a fragmentary longitudinal vertical
section of a form of apparatus by which the
mold with the metal ,tube therein may be held
and rotated, and receive molten metal to be dis
tributed over the inner peripheral face of the
tube centrifugally.
'
Fig. 5 is an elevation, partly in longitudinal
section, showing the ?nished tube lined with cast
metal, such as cast iron, after the casting proc
ess has been performed, and further indicating
duction with a resultant substantial uniformity ‘ the steps by which the' tube is transversely cut
20 such brake drums very rapidly and in mass pro- .
to provide brake drum rings.
7
Fig. 6 is a brake section ‘or ring,-a plurality
Cast iron is a material which has exceptional
qualities for braking, producing high and smooth ' of which are produced upon cutting the tube and
25braking characteristics. Cast iron employedas cast lining therein in accordance with my inven
of product and economy in cost.
the braking or wearing face of brake drums, be
cause of its relatively brittle nature, should be
supported or backed by a metal of a tougher and
ductile nature, such as steel, to prevent fracture
30 of the iron from suddenshocks. The use of a
_ steel backing also permits the forming of brake
drums of a much lighter weight than if the same
were made entirely of cast iron. The surface of
the cast iron, upon which the ‘brake lining or
shoes bear must‘ be smooth,_ free ‘from pits or
other holes, cracks or sponginess, and further
free from foreign-material, such as slag or dirt.
The present invention has for one ‘of its objects
- and purposes the production of a large quantity
40 of centrifugally cast iron lined brake drums in -
_a single casting operation, so far as the casting
is concerned, and with ‘the iron properly inter
moiecularly joined to and with an outer support
' ing backing or steehand with the production of_
' the proper quality of iron, free of imperfections
tion.
'
,
-
‘
a
_
_
Fig. 7 is a sheet metal supporting back to be‘.
used in completing the brake‘ drum.
'» ‘
‘Fig. 8 is a central vertical section through a
completed brake drum of preferred construction 30
showing the attaching of the supporting back
to the brake drum ring, and
-
I
Fig. 9 is a similar ‘section'of a completed brake
drum, showing an alternate form of construc- "
tion and method of attaching the supporting
back to the brake drum ring.
Like reference characters refer to like parts _ ,
in the di?erent ?gures of'the. drawings.
In carrying out the method which I have \in-‘ I
vented, an elongated tube I'of a ductile metal, 40
such as low carbon steel, is provided. The ma
terial used is such as is readily shaped and
formed when it is heated to a comparatively high
degree of . temperature. This tube, in pursuance
of my method, at its ends is first formed with. 45
Y-_-su,ch=_tl_iat the same is suitablevfor brake drums, ?anges 2. The depth of the ?anges is greater
_;-_;V..pa_r_ticularly on motor vehicles wherein the drums ‘ than the thickness of the cast metal lining which
is to be cast at the inner peripheral surface of
, :are subjected to severe usage.
.»
> An zunlderstanding of my invention, whereby the tube and provides dams against the molten
tactical and successful attainment of the‘ iron contacting the end ?anges of the mold and 50
h
~-,o_bje_cts_§ stated is secured, as well as others not becoming\attached' thereto, preventing removal
-‘ at‘ this‘ time enumerated, may be had from the
following description, taken in connection with
the accompanying drawings, in which,
Fig; 1 illustrates an elongated and relatively
' of the tube from the mold.
'
A mold in a plurality of sections, three of such 7
sections being shown in Fig. 3, is made of a shape
such that when the sections are secured together
55
‘2,109,470
tube initially suiilciently high that the molten
iron coming thereagainst is not chilled or solidi
?ed, and withv the high rotative speeds used and
the great heat capacity of the mold, the tube I
and the molten iron have e?ected a substantially
integral molecular joinder of the cast iron and
the steel tube throughout their opposed contact
me surfaces.
-
.
-.
"
.
In order that this integral molecular joinder,
10 that is, a fusion, of the cast iron and steel of the
tube shall take place when the molten iron is
poured into the tube l, the inner surface of the
tube is initially cleaned and has applied thereto
a protective covering or. coating which serves to
15 exclude oxygen of the air contacting the tube
when the tube ‘is heated, thus preventing any
oxide scale being produced at the inner surface
of the tube. The centrifugal action described
has thee?‘ect of forcing the heavy materials out
20 wardly and any lighter materials inwardly, such
, that there will be produced a dense quality of
cast iron and gases produced in and by the melted
iron coming into contact with the protective
coating used and any slag, dirt or foreign matter
25 in the iron being forced by the difference in
centrifugal caused by the di?erence in speci?c
gravity to the inner side of the lining 21, where
the gases escape and any solid foreign matter
30
becomes a part of a scale which is eventually ma
chined away.
'
3
drum rings and cutting the double width bands
midway of their width into single brake drum
bands.
-
.
‘
The drum is ‘completed by machining the inner
peripheral surface of the cast lining and apply
ing a metal supporting back -35 thereto. The
back is in the form of an annular dished disk of
sheet steel having a central opening therein and
with the central portion of the disk offset to one
side, this being produced in a press in the usual 10
and well known manner. The back has an ex
terior diameter such as to ?t within the annular
projecting end portion 34 and bear against the
adjacent shoulder'34b of the lining 21. The-an
nular projecting portion 34 is then bent inwardly 16
making a continuous annular ?ange 34a em
bracing back 35 to which this ?ange 34a is welded
at the joint 36, thereby providing a complete
brake drum ready for attachment to a wheel.
In Fig. 9 an alternate form is shown. In such
case, the projecting portion 34 is not provided
at one end of the brake drum ring but theedges
of the lining'2l lie ?ush with-the edges of the
sheet‘ metal shell‘ la around the lining. The
back 35 is made with a larger diameter so that 25
its peripheral portions extend beyond the shell
‘la to be turned at right angles and make a con- '
tinuous annular ?ange 35a which extends over
one end of the shell la.. The parts are welded
together at the joint 36a as shown.
_
After the casting operation has been performed _
By the method described a large number of
and the molten iron has solidi?ed and as soon
brake drum rings (connected together in aline
as the product made and the mold which en
closes it is in proper condition to handle they ment are provided with a single casting opera
are taken from the chuck, the mold removed and
the ribbed steel tube with the cast iron lining
having an integral fused union therewith is al
lowed tocool. It is then subjected to machining
operations to obtain therefrom a plurality of in
tion, and the individual brake drum rings are
separated from each other by machining as de
scribed. The tube'l needs no rolling or preform
ing to produce the annular heat disseminating
so,
3.5
ribs 28 therein, as such rings are automatically
provided by the method which I have described.
The ?rst machining operation after the‘ lined It is, of course, to be understood that the method ’
tube is removed from themold' is to cut the» which I have‘provided isnot restricted to produc--_ _'
?ange 2 away from the end of the tube allowing ing the annular ribs 28 in the manner described
the steel tube to extend beyond the cast iron as the same may be produced initially in the
forming the shoulder 34b'and the projection 34 ' tube I before it isplaced in the mold. However.
after which the ?rst brake drum band is cut it is a simpler and more economical process to 415
from the tube at one of the enlargements 29 by - automatically produce such ribs as described._
the cutter 33. The cast lining of the tube is then With my invention'large quantity production at
40 dividual brake drum rings.
,
I
cut to form a groove the width, of two of the
lips or projections 34 plus the width of ‘cutter 32
and the second drum band is cut from the-tube.
Thereafter the lined tube is brought in position
for the third drum band to be cut from the tube
by the cutter 32 and the third drum band is then
cut from the tube and a repetition of these oper
ations is carried on until the tube has been cut
into aplurality of single brake drum shells, each
provided with a projection 34 and shoulder 34bv
at one side and a plain cut enlargement at the
opposite side. These operations are indicated in
Fig. 5 of the drawings, and while the preferred
‘cutting of the tube is into a plurality of single
the lowest cost is attainable. The temperature
of the steel tube and of the molten iron is such .50
as to produce an intermolecular joinder of the
steel and iron at their contacting surfaces and
make a true fusion thereof. The temperatures
given are subject to variation. If necessary, the
steel and the ‘mold can be raised to a higher tem
perature than 1100“ F. without damage from de 5.5
formation. A temperature of \cast iron in the
neighborhood of 3000” F'., howeveii, is sufficiently
high that a fusion joinder of the feast iron with
to
the steel will take place particularly under the (i0-v
conditions herein described with the steel in the‘ ' a
neighborhood of the temperatures speci?ed.
width brake drum bands nevertheless they may - '
Having thus described my invention, what I
be cut into a plurality of two or more width drum claim and desire to secure by Letters Patent ,is:
65 hands by ?rst cutting the ?ange 2 away at one
1. The herein described. process which consists
end of the tube as previously; thereafter sub
in providing an elongated cylindrical mold having
jecting the lining 21 to successive cutting opera
spaced apart annularly extending grooves around
tions as by the tools 30 and 32 at spaced intervals
the.
inner’ peripheral face ‘thereof, holding an
making annular grooves 3| in the lining, leaving elongated
cylindrical metal tube within said mold,
the metal shell intact; then cutting the outer said tube having'at
'each endan annular ?ange, 70'
,tube shell as by the narrow cutting tool- 32 mid
heating
the
tube
and
mold to a high degree of
way between the sides of the grooves 3| whereby
‘temperature, rotating the mold and tube at high
double width drum bands are provided; ma
chining the inner periphery of the lining 21 speed about the longitudinal axis of the tube,
either before or after it is separated into single and depositing molten metal heated to a tempera
ture in'excess of its melting temperature within 75
2,109,470
4
consists in providing an elongated tube of thin
steel, lining said tube with a cast iron liner, cut
ting continuous annular spaced apart grooves in
the tube as the same is rotating whereby a lining
of metal over the inside of the tube is produced
and spaced apart annular ribs filled with metal
the liner and through the ‘same to the tube at
formed in the tube around the same through
pressure exerted by the centrifugal force of the
molten metal under the high speed of rotation,
as speci?ed.
distances apart equal substantially to the width 5
of two drums, cutting transversely throughthe
tube at said grooves and midway between the
sides of the grooves, thereby providing a cast iron
'
2. The herein described method which consists‘
of the steps recited in claim 1, together with addi
tional steps comprising cutting the composite
.10
structure formed-of tube and solidi?ed molten
‘metal transversely across between said annular
ribs, thereby providing brake drum rings having
' an outer supporting shell of sheet metal and an
15
inner ‘wearing band of cast metal integrally fused
thereto.
,
3. The method of producing a brake drum ring
which consists in providing a cylindrical mold‘
having an interior annularly extending groove,
20 locating and holding an outer shell of thin steel
in said mold, said shell being of cylindrical form,
rotating said mold and shell, and depositing a
molten iron alloy in the shell while it is rotating
whereby the molten iron is distributed over the
25 inner face of the shell by centrifugal action, and
lined tubular section of substantially the width of -
two drums having at each end a projecting annu
lar extension of the sheet metal tube beyond the
lining, and cutting each of said sections trans
versely midway between its ends.
'
8. The herein described method which con
sists in providing a tube of_ thin metal, placing 15
the tube in a form, said form having depressions
therein at its inner side, heating the tube and
form, revolving the tube and form about the
longitudinal axis of the tube, and depositing in
the tube .molten metal, whereby the walls of the 20
tube under the temperature imparted thereto by
the molten metal and under the pressure of the
metal is pressed into the form and shaped thereby,
“ and ?lls depressions made by shaping the tube to
the shell is deformed into and substantially ?lls
25
the form.
9. The method of producing brake drums which
consists in providing a brake drum mold, locating .
the groove in the mold, as speci?ed.
'
.
'
a tubular brake drum shell therein, said’ mold
.4.‘ The method of producing brake drums, having a continuous annular groove at its inner
which includes providing a tube of thin steel, said side, heating the shell and mold to high tempera 30
30 tube having inturned annular ?anges at its ends,
tures, rotating the same about the longitudinal
placing said tube in a mold, said mold having axis of the shell, and depositing molten metal
annular grooves therein spaced apart from each heated far above its melting .point in the shell
other distances equal substantially to the width of while it is rotating to form an intermolecular
a single brake drum, heating said mold and tube ‘ joinder of the shell and molten metal and press 35
the shell into the groove of the mold, the molten
35 to a high degree of temperature, rotating the mold
and tube at a high speed about their longitudinal . metal ?lling the groove formed in the shell. ‘
axis, depositing molten iron in said tube while ro
10. The method of producing brake drums
tating at a temperature within 200° more or less which consists in producing a cylindrical tube of
of 3,000“ F.'thereby producing a fusion joinder metal, the length of which is greater than its di 40
of the molten iron with the tube and automati
ameter, ?anginginwardly each of the ends of the
callyv forming annular ribs around the tube tube, placing the tube in a sectional mold, the in
pressed by the molten iron into the grooves of the terior of which is in the form of the outer curved
mold, and cutting the tube and the iron- lining ' sides of a plurality of brake drum rings positioned _
therefore transversely into sections, each “of a end to end, heating the mold and tube to a tem 45
width'for a brake drum and each section having _ perature of at least 700° F., revolving the mold
an outwardly extending annular rib.
and tube, pouring into the tube molten metal of a
5. The method of producing brake drums which temperature su?iciently high to heat the tube to
consists in lining an elongated tube having out
at least 1,500" F., revolving the mold, tube and
wardly extending spaced apart annular ribs molten metal at a high speed su?icient to cause 50
therearound with a cast iron alloy, the annular the tube to conform to the interior of the mold
ribs being spaced from each other a distance sub-* under the centrifugal pressure of the molten
stantially the width of a brake drum, machining metal, allowing the mold and tube to cool, re
the cast iron lining at spaced apart intervals to moving the tube from the mold and cutting the
provide continuous grooves extending entirely same into brake drum rings, each comprising an
through the lining to the tube, said grooves in outer shell of ‘the metal of the tube and-an inner
the lining being spaced from each other a distance lining of cast metal, and each having at one end
equal to approximately thewidth of two brake a projecting annular portion of the tube extend
drums, cutting the tube transversely at said ing beyond the end of the lining, forming a sup
grooves in the lining midway between the sides . porting back for the brake drum ring, placing the
of the grooves thereby forming double width back against the end of the lining and inside said
brake drum sections, each having an outer sup
projecting portion inwardly against the periph
porting shell and a‘ cast‘ iron lining therein and eral portions of the supporting back and weld
with the shell projecting ateach end beyond the ing the same thereto.
lining, and dividing each double width drum sec
11. The method. of producing brake drums m
tion thus produced midway between its ends _ which consists in lining a cylindrical steel .tube
65 transversely to provide two single drum rings.
with cast iron, cutting the cast iron lining and the
'6. The process of producing brake drums con ' steel tube into’a plurality of brake drum ring sec- '
sisting of the steps de?ned in claim 5, forming a "tions of which the steel tube at
_ a side of the sec
back of sheet metal of circular form of a size to
fit within the projecting end of the shell and
70 against one end of the lining, and forming said
projecting end of the shell inwardly against and
over the peripheral portions ofjs’aid back and per
tion projects‘ beyond the cast iron lining/,1 placing 7,
a supporting‘ back plate inside of the projecting
steel of the tube and bending the steel or the
projection ‘against the supporting back whereby
the supporting back is secured to the brake ring
- manently securing the same thereto.
7. A method of producing brake drums which
‘sections.
'_
'
.
1
9,109,470
,5.‘
12. The method of producing- brake drums ' 16. The method of forming brake drum ele
which consists in lining a cylindrical steel tube ' ments
including the steps of forming a cylindrical
with "cast iron, cutting the cast iron lining and sheet metal
band with radially inwardlydirected
the steel tube into a plurality of brake drum ring
sections of which the ‘steel tube at a side of the annular ?anges at opposite ends thereof, casting
a liner in said band,_severing said band between
section projects beyond the cast iron lining, plac
its
ends into brake drum elements and removing
ing a supporting. back plate inside of the pro
jecting steel of the tube and bending the steel
of the projection against the supporting back
10 whereby the supporting back is secured to the
‘ brake ring sections and joining the steel of’ the
section to the supporting back as by welding.
13. The method of producing a brake drum ring
or the like which consists‘, in providing a mold
16 having an interior depression, locating and hold
ing an outer shell of thin metal in said mold, r07
tating said mold and shell, and depositing a
molten alloy in the shell while it is rotating
whereby the molten alloy is distributed over the
20 inner face of the shell by centrifugal action, and
the shell is deformed into the depression in the
mold, as speci?ed.
25
_
_
.
14. The method oi’ making brake drum ring
elements including the steps of forming a cy
lindrical band, casting an interior lining of metal
into said band,
severing said band between its'
1
ends to form ring portions, and then forming the
metal of the band only of each of said portions
along the severed edge thereof to provide a seal
ing element.
,
portions of the liner along the edges‘ at which
severing takes place, and then bending the sheet‘
metal portions only along the bored edges thereof
to- form sealing elements for cooperation with a
backing plate. }
I
-
' 17. The method of making brake drum ring
elements, including the steps of forming a c'ylin-~v
drical band of a length greater than the added
widths of two brake drums, casting an interior 15
lining of metal into said band,’removing an in
termediate portion of the cast lining, severing the
cylindrical‘ band at the removed'portion of the
cast lining wherebrbrake drum ring elements '
are made, each having an outer cylindrical band 20
section- which projects at one end beyond the ‘
adjacent end of the cast metal lining, and then
forming the projecting metal of the band into a ‘
?ange.
.
.
18. The method of making brake drum ring 25
elements which includes, the providing of an’ outer
cylindrical steel shell fora plurality of said ele
ments, casting an interior lining of cast iron into
said'sl'relLremoving a continuous annular portion
of the cast iron to the inner side of the band so as
15. The method of forming brake ring elements to
divide the cast iron lining into separate lengths
including the steps of forming a sheel metal band, each.
the width of a brake drum, severing the
casting a liner into said band, severing, said hand steel of
to provide an'annular section of the
between its ends to form separate ring elements shell shell‘
to
extend
the adjacent end of the
and removing portions of the liner along the edges lining, and then beyond
forming
the said projecting por 35
at which severing takes place. and then forming
the bared edge portions of the ring elements into tion of the shell into a flange.
sealing elements.
Wuhan."
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