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Патент USA US2406062

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‘ Aug. 20, l946~ j
Filed Aug. 24, 1944
3 Sheets-Sheet l
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I 42 45 44"
Aug- 2G, 1946.
2,406,062 n
Filed Aug. 24, 1944
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Patented Aug. 20, 1946
' 2,406,062
Dana R. Cornell, East Chicago, Ind., assigner to
Standard Forgings Corporation, Chicago, Ill., a
corporation of Delaware
Application August 24, 1944, serial No. 550,959
1 Claim.
(Cl. „Z9-159.01)
This invention relates to a >method for making
ing, obviously, is much more economical, and,
dished disk wheels, and particularly for making
furthermore, the hand holes produced thereby‘are
disk Wheels which are deeply dished.
uniform in size and spacing, a result difficult to
attain by index punching.
The disk wheels to be produced by my method
are tapered in thickness, radially, from an annu- 5
lar region outwardly of the hub portion to the
peripheral edge of the disk, and are provided
ywithfa plurality of hand holes located in the web
portion between said hub portion and the periph`eral edge. The disk, as initially forged, is relatively hat and is subjected to severe bending and
forming `operations in order to produce the deeply
dished disk wheels of my invention.
By 'using the method hereinafter described,
several important advantages >are attained. The
forged, relatively flat disk while still hot, is subjected .to'trimming and preforming in one operation, punching of the central aperture and hand
holes in `another operation, and iinal forming in
a third operation. By this method, vthe hand
lholes can be punched through the web of the
ldisk after it has been moderately bent and formed
but `while ‘it is still vfairly flat, and 4sufficient backing is afforded by a lower, supporting die to
properly support the disk while it is beingr
punched. However, the major bends are placed
in .the disk in the ñrst forming operation, prior
to `the punching, so that the final forming opera-
Flexing of the finished wheel takes place 'to a
maximum degree in the rirny portion which has
the largest circumference and least thickness.
Therefore, it is of particular importance to avoid
weakening the rim region of the disk by cutting
off metal on acute angles to form the necessary
hand holes. Excessive metal is cut away when
the hand holes are punched out after the final
shaping of the deeply dished disk and therefore
my method of punching the holes between the
first and final forming operations serves several
purposes: conserving the metal around the hand
holes; preserving the right angle relationship of
the cut edges and adjacent disk surfaces; mini
mizing the length of the stroke of the press re
quired for punching the holes before the disk
has'beel'l giVGIl ìts'deep (lished form; facilitating
the punching by accomplishing it before the disk
has become cool; and avoidingr distortion of the
metal which would result if the major bends
were formed in the disk after the punching oper
In the drawings;
Fig. lis a Vertical sectional view of a pair of
tion does not .distort unduly the -metal around
ydies for preforming and trimming the relatively
the hand holes, thus minimizing distortion in a 30 dat forged disk.
part of the disk which is particularly subject to
Fig. 2 shows the apparatus of Fig. 1 in ano-ther
load strains in operation. Although the disk is
.position and shows the forged disk trimmed and
deeply dished in the final forming operation, the
major bends >placed therein in the nrst forming
Fie. 3 is `a vertical sectional View of punching
operation are not greatly affected in said final 35 apparatus, ShOWing the preformed disk after the
‘forming step and this is a desirable feature of
centra-l aperture and hand holes have been cut.
my -invention for the 'reason that the major bends
Fig. 4 iS a Vertical SSCÈÍOIIQJ VÍBW 011 an enlarged
should be accomplished while the disk `is still
scaleof a part of a pair of dies for finally form
ing the punched, preformed disk.
Punching of the hand holes between the `'first 40
Fig. A5 is a plan View of the finished disk.
and final forming operations results in cut edge
Fig. 6 is a transverse section, on an enlarged
surfaces which are substantially at vright angles
scale, taken inthe plane of the line 6_6 of Fig. 5,
to the adjacent Vsurfaces of the disk instead of
looking in the direction indicated by the arrows.
forming acute angles as would be the case were
In the preferred embodiment of theinvention
the .hand holes punched after the final forming. 45 shown in the drawings, the forged steel disk, as
My method permits of the use of multiple punch»
shown in Fig. 1, is substantially flat andV smooth
ing, whereas, if it were attempted after the final
on its surface lll and provided with a central
forming of the deeply dished disk, to produce
boss ll. The oppositefsurfac’e has a central boss
hand holes of the form herein shown, index
i2. a surrounding flat-.annular portion i3, thick
punching would have to be resorted to. By index 50 cned annular portion lâ, radially inclined region
i5 and .peripheral flat, narrow fin surface I6.
punching is meant a method wherein the work is
The apparatus 'for trimming and preforming
turned intermittently and each hand hole is
.the forged disk, shown in Figs. l and 2, com
formed separately by a punching -tool mounted
prises dies I'l and i8. The die l1 is mounted
at an inclined angle in order to work on the
dished surface to be punched. Multiple punch- l - in a suitable reciprocating support (not shown)
and its face is complemental to the intended sur
face of one side of the disk in its preformed stage.
hand holes, and a cutter 48 for cutting the cen
tral opening. It also is provided with a disk bear
Said die has a central recess I9, a flat annular
ing member 49, spring pressed by the springs 50.
Another disk bearing member 5|, preferably in
surface 2U, a radially curved concentric ring 2|,
two radially downwardly inclined'concentric sur
tegral with the member 49 and also held down
by the action of the springs 50 bearing on the
` part 49, bears on the peripheral portion of the
disk vwhile the cutting takes place. l'I‘helower die
52 has an annular groove or opening 53 through
which the cut out metal to form the holes 54
Ymay pass, and it has a central depressible mem
ber 55 supported by a spring 59 for cooperating
with the cutter 48. The peripheral disk support
faces 22 and 23 and a peripheral horizontally dis
posed surface 24. On the outer edge of the" sur
face 24 is a peripheral cutting edge 25 made of
stellite, chromium or other suitable materialv
welded on the carbon steel casting constituting
the die I1.
The lower forming die | 8 is rigidly mounted on
an anvil 26 having a fiat shoulder 21 on which
is mounted, by a bolt 28, a circular housing 29
internally recessed at 39, toaccoinmodate a ring
3| between the housing 29 and the die I8. The
ring 3| is supported on a plurality of coiled
springs 32, located beneath the flanges of the
ing member 5l cooperates with the upper die
member 5| to hold the rim portion of the disk
during the punching operation.
Because of the fact that the web region 31--43
(Fig. 2) vof the disk is relatively flat when the
ring adapted to move vertically in the recesses ‘ hand holes are punched (Fig. 3), the stroke of
30 of the housing 29. The ring 3| has a flat upper 20 the cutters 41 and 48 may be relatively short.
Also, although the cutters move in vertical planes,
The kface of the die IB is providedl with a cen
the cut edges of the diskare substantially at
tral recess 34, surrounded by a flat annular sur
right angles to the adjacent disk surfaces at the
face 35, radially curved concentric ring 36 and
end of the punching operation shown in Fig. 3,
radially-downwardly inclined portions 31 and 3S.
thereby avoiding the formation of acute angles
The forged disk is placed on the lower forming
in the finished disk.
die I8 with its fiat surface i0 adjacent the face
The next and ñnal step of my process is shown
of the die, and the central boss || in the recess
in Fig. 4, where the preformed, trimmed and
34. In this position the disk surfaces i3, I4, l5
punched out disk is subjected to its final forming
and I6 face the upper die |`| as shown in Fig. 1
operation by upper and lower dies 58, 59 respec
and the peripheral portion of the disk is engaged
tively. These dies have disk bearing surfaces
between the fiat peripheral surface 24 and the
complemental to» the finished form of the deeply
top of the ring 3|. As the die |'| is moved down
dished disk shown in section in Figs. 4 and 6,
wardly, the Vengaging members 24 and 3| continue
and in plan view in Fig. 5. In its ñnished form,
to clutch the disk and prevent wrinkling of the
said disk retains the preformed surfaces 35, 4|,
metal as the _diameter and circumference of the
3S and 42, with the central portion cut away to
disk are reduced in 'the preforrning operation.
form the opening 60, but radially outwardly of
As'the cutter edge 25 meets a cutter edge 33 fixed '
said preformed major bend 36-42, the web re
on the inner edge >of the housing 29, the disk is
gion 3'l-43 of the punched out disk is given an
peripherally trimmed by cutting olf the iin |6,
other annularly located, radially extending bend
and as the die |'| continuesits downward move
6| which shapes the metal between and sur
rounding the hand holes 54 and changes the an
ment, the ring 3| is depressed, the disk gradually
slips from between the holding surfaces and the
parts assume the position shown in Fig. 2.
In Fig. 2 is shown the preformed, trimmed, ~
moderately dished disk as it appears in section
after the first forming operation'. In this form,
the upper surface comprises the central boss 34,
flat annular hub portion 35, downwardly curved _
annular ring 35 in which is utilized ,the metal
of the thickened portion I4v (Fig. 1), ñat radially
downwardly inclined annular portion_3ï, down
wardly curved annular ring 3_8 and circumfer
gular position of the rim portion 38, 39, 44 (Figs.
2 and 3) to the position indicated at B2, 63, 64
and 65 in Figs. 4, 5 and 6.
As best shown in Fig. 6, these operations `re
sultin forming a deeply dished disk with hand
holes having cut edges 66 and 6l substantially at
right angles to the adjacent surfaces of the rim
region of the disk. It is essential to preserve
this relationship of the metal surfaces particu
larly in the rim region of the disk which is rela
tively thin and subjected to the greatest flexing
ential rim portion 39. The lower surface of the
and strain in use. `By my apparatus'and method
preformed disk comprises the boss 49, and sur- '- ' I avoid cutting away of metal and the forming of
faces 4|, '42, 43 andA 44, which together with the
acute angles between the hand hole edges and
upper surfaces described form a disk of substan
adjacent surfaces, in addition to the advantage
tially uniform thickness in the central hub por
, of using multiple punching as heretofore men
tion including the inner major bend, and of grad
ually decreasing thickness in the region between oo
It will be understood from the foregoing that
said major bend and the peripheral edge 45.
my method comprises the preforming and trim
»While the preformed disk is still relatively flat
ming of a disk initially forged relatively flat, to
in the region defined by the surfaces 31-43, be
provide two annular major bends such as deñned
tween the bends 3S and 38,` it is subjected >to a
by the curved surfaces 36-42 and 39--44, with
multiple punching operation in which the cen
a relatively flat web portion between them, then
tral bosses 34 and 40 and part of the surrounding
subjecting the preformed disk to a multiple
portions 35-4| are cut out to form a hub center,
punching operation which cuts a` central open
and hand holes are cut through the web portion
ing in the disk and a plurality‘of hand holes in
3‘|`-43. I have shown eight hand holes but the
the web portion between said major bends, and
number may vary,v usually between five and ten.
finally subjecting the preformed, trimmed and
In Fig. 3, I have shown punching apparatus for
punched out disk to another forming operation
multiple punching, that is, for providing the
in which an annular bend is made in the web
central opening and the desired number of hand
portion as indicated at 5| in Fig. 5, between the
holes _in one punching operation. The upper
preformed 'major bends, whereby the~an`gular
punching die 46 has cutters 41 for cutting the
disposition of the rim portion of the disk is al
tered, and the disk as a Whole is deeply dished,
all without undue distortion of the metal, while
portion and utilizing the metal of said portion
retaining required strength and contour where
to make the thickness of the bend substantially
conform with that of the hub» portion, and also
needed in the finished disk.
Changes may be made in details of construc
bending the peripheral rim portion as it gradu
ally-slips from between the clamping means pre
venting wrinkling of the metal as the diameter
and circumference of the disk are reduced, thus
providing the disk with two axially curved con
lowing claim.
centric major bends connected by a frusto-coni
I claim:
The method of making a deeply dishéd disk 10 cal web portion in the initial bending operation,
simultaneously punching a central aperture in
Wheel having a relatively ñat hub center and ax
the hub center portion and a plurality of hand
ially dished web portions terminating in a cylin
holes in the web portion, and iinally bending and
drical rim portion, which comprises the step of
tion of the apparatus described without depart
ing from my invention as set forth by the fol
preforming a relatively ñat forged steel disk with
axially curving the web portion while maintain
an annular hub portion of substantially uniform 15 ing the concentric bends substantially as formed,
whereby the disk is deeply dished and the periph
thickness surrounded by an annular rim portion
ery of the rim portion is disposed substantially
and a relatively thickened annular portion be
at right angles to the hub portion.
tween the hub and rim portions, yieldably clamp
ing the periphery of the rim portion while ini
tially bending the disk axially at said thickened 20
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