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Патент USA US3053220

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Sept. 11, 1962
3,053,210
C. M. KOWALSKI
PIERCE AND FLANGE DIE ASSEMBLY
Filed July 15, 1959
4 Sheets-Sheet 1
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Sept. 11, 1962
c. M. KOWALSKI
3,053,2 l 0
PIERCE AND FLANGE DIE ASSEMBLY
Filed July 15, 1959
4 Sheets-Sheet 2
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Sept. 11, 1962
c. M. KOWALSKI
7
3,053,210
PIERCE AND FLANGE DIE ASSEMBLY
Filed July 15, 1959
’
4 Sheets-Sheet 5
38
39
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Sept. 11, 1962
3,053,210
c. M. KOWALSKI
PIERCE AND FLANGE DIE ASSEMBLY
Filed July 15, 1959
4 Sheets-Sheet 4
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United States Patent it
ice
3,053,210
Patented Sept. 11, 1962
1
2
by the punch and the formation of sharp burrs thereon.
Other objects and advantages of the invention will be
3,053,210
Chester M. Kowalski, Livonia, Mich., assignor to Lyon
PIERCE AND FLANGE DIE ASSEWLY
come more apparent during the course of the following
description, particularly when taken in connection with
the accompanying drawings.
Incorporated, Detroit, Mich., a corporation of Dela
ware
in the drawings, wherein like numerals designate like
Filed July 15, 1959, Ser. No. 827,236
5 Claims. (Cl. 113—42)
parts throughout the same:
FIGURE 1 is ‘a fragmentary vertical sectional ViGW,
The present invention relates broadly to the art of
with parts in elevation, showing a die assembly embody
metal formation and is more particularly concerned with 10 ing the concepts of this invention and with the punch
a new and improved die assembly e?ective to sequen
member spaced relative to the die member preparatory
tially pierce a metal part and form a ?ange about the
to the piercing and ?ange forming operations;
pierced opening therein and having among its advan
FIGURE 2 is a vertical sectional view of the die as
tages a complete absence of burrs or sharp surfaces on
sembly with additional details thereof shown, and illus
the formed ?ange.
trating the piercing step;
,The production of automotive wheel covers, to which
the instant invention particularly relates although not
FIGURE 3 is a view similar to FIGURE 2, and show
ing further advancement of the punch member and low-‘
being so limited, requires as one step the formation of a
ering of the die member sleeve during ?ange formation;
valve stem opening and ‘an annular ?ange thereabout
and
radially inwardly of the wheel cover peripheral portion. 20 FIGURE 4 is a plan view of the die member of the
It has heretofore been the practice to employ for this
purpose a tubular piercing and ?ange forming punch in
association with a tubular female die member backed by
preceding views.
vThe die apparatus and method of this invention are of
especial utility in the provision of valve openings and
surrounding ?anges located radially inwardly of the pe
spring means having a high degree of resistance to com
pression. Accordingly, subsequent to the piercing step
and upon entry of the punch ?ange forming surface into
the mating portion of the die cavity, substantial resistance
to ?ange formation was encountered and the metal form
25
riphery of automobile wheel covers, and will accordingly
be speci?cally described in this connection herein. It
vwill be readily apparent, however, to those skilled in the
metal working arts that the novel techniques of piercing
ing the ?ange surrounding the pierced opening was
and ?ange formation herein disclosed are not restricted
smeared or wiped, with the result that sharp and danger 30 to the wheel cover art. As for example, ?at metal sheets,
ous burrs were formed on the ?ange. This condition is
metal rims and articles of disc-like con?guration can
naturally a hazard to manufacturing personnel, and burr
e?ectively be processed in accordance with the steps
removal required an additional manufacturing step with
of this method.
associated increased cost.
Referring now ?rst to FIGURE 1 of the drawings,
It is therefore an important aim of the present inven~ 35 there is shown an illustrative form of wheel cover 10
tion to provide a piercing and ?ange forming method
having an annular inwardly turned peripheral ?ange por
wherein a shearing action is employed and the metal sur
tion 11 connecting with .an annular intermediate dished
rounding the pierced opening is essentially smooth so
that during ?ange formation no wiping action occurs
portion 12, and in which the valve hole and surrounding
?ange is conventionally provided. The other details of
4.0 the wheel cover 10 do not bear upon this invention and
with the production of objectionable burrs.
Another object of this invention lies in the provision
accordingly are not speci?cally described, except to note
of a die assembly for piercing and ‘?ange formation, and
that the annular dished portion 12 may connect with an
in which the female die member is held rigid with re
annular raised portion 13, radially inwardly of which
spect to the advancing punch member during piercing
may be a second annular dished portion 14 ultimately
and is moved in the direction of punch movement and 45 connecting with a central portion 15 of generally dome
‘away therefrom during ?ange formation to effectively
shaped con?guration.
eliminate sharp surfaces on the formed ?ange.
To render unnecessary the hand manipulation of the
A further object of the instant invention is to provide,
wheel cover 10 for initiation of the piercing step, there
in association with the described die assembly, a support
is herein provided support means including a shelf por
ing member ‘for a work piece of disc-like con?guration 50 tion 16 which accurately tilts or translates the wheel
and which is pivotally mounted for translatory move
ment to direct the work piece unto the die assembly dur
cover 10 to an accurately located position on the die
ing advancement of the punch assembly in contact with
which will be described in detail hereinafter. The sup
port means 16 may take the form of a relatively ?at table
the work piece on the supporting member.
A still further object of this invention lies in the pro
vision of a die assembly for piercing and ?ange forming
member under action of the punch member, each of
55 engagea-ble on one side with the peripheral ?ange 11
‘operations upon a metal part, and which features a
of the wheel cover 10 and translatable in a generally
clockwise direction by means of a rod member 17
punch member having an active end provided with pierc
ing and ?ange forming surfaces, a die member having a
rrounted by a ?ange 18 and pivotally receiving a shaped
bracket 19 rigidly mounted at its opposite ends by die
collar member provided with a contoured end and a sleeve 60 member base 20 through the use of screw means or the
member receivable within‘ the collar member and having
like 21.
‘an end contoured to the end of the collar member to lie
to receive therethrough bolt means 23 threaded into the
The bracket member 19 is apertured at 22
support member shelf portion 16 through a rigid nut
connection 24 which also provides bottoming means for
vide a cutting surface cooperating with the piercing sur
face on the punch member during said operation, and a 65 a yieldable biasing spring means 25 encircling the bolt
?ush therewith during the piercing operation and to pro
support member receiving the opposite end of the sleeve
means 23.
member to restrain the same during piercing and resili
ently urged in sliding contact with said end of the sleeve
member during advancement of the punch member and
nection with the steps of the instant method, the support
'move the sleeve member in the direction'of punch travel
of the bolt means 23 against the walls de?ning the bracket
aperture 22, as shown in FIGURE 1. However, when
As will be described in detail later in con
means 16 with wheel cover 10 thereon are maintained
in a substantially level and ready position prior-t0 the
subsequent to the piercing operation, to continuously 70 piercing step by the stop action provided by abutments
during ?ange formation to prevent a wiping of the ?ange
3,053,210
3
.
the wheel cover 10 and shelf portion 16 are tipped or
4
tion there is provided an axially inclined or ?aring mouth
translated during contacting advancement of the punch
member, the bolt means 23 is generally in an intermediate
or spaced relation with respect to the bracket opening
portion 49. As best shown in FIGURE 1, the inclined
mouth portion 49 has a relatively wide upper surface 49a
against which bears the wheel cover support shelf 16,
23, as indicated in FIGURES 2 and 3 of the drawings. ‘
The die apparatus of this invention is designated in its
an arcuate surface 49b which supports the wheel cover
entirety in FIGURE 2 by the legend A, and may be seen
to comprise a die assembly 2%} and punch assembly 26.
The movable punch assembly 26 is provided with a head
portion 27 supporting one or a pair of spaced upright 10
members 28 carrying at their lower ends a block mem
ber 29 having tapered cam surfaces 2% and 2912, which
cooperate with structure of the die assembly 20 to lower
annular dished portion 12 during piercing or cutting, a
straight or axial portion 49c which cooperates with the
punch ?ange forming surface 34 to turn a portion of the
metal in the wheel cover dished portion 12 to provide
the ?ange surrounding the pierced opening, and a down
stream upper surface 49d also supporting the wheel cover
dished portion during piercing and ?ange formation.
The die collar 44 slidably receives a die sleeve member
or tubular shearing member 50 provided with an arcuately
operation.
15 inclined mouth portion 51 having a shearing surface 52.
The head portion or plate 27 of the movable punch
The tubular shearing member 50 has a stepped bore 53
assembly 26 additionally supports a mounting block 30
therethrough forming at the upstream end thereof a shoul
rigidly receiving a punch member 31, shown to be of
der 54 which de?nes generally the extent of axial travel of
stepped con?guration and having a head portion 32 and
the punch reduced diameter portion 3312 within the sleeve
a shank or active end portion 33 provided with an axially
member '50. In other words the maximum distance from
inclined ?ange forming surface 34 and an axially inclined
the shoulder 54 outwardly therefrom to the highest point
piercing or cutting surface 35. The ?ange forming sur
on the arcuately inclined mouth 51 of the sleeve member
face 34 and cutting surface 35 de?ne therebetween a
50 corresponds generally to the axial length of the punch
shank segment 33a ‘which is preferably tubular, and as
reduced diameter portion 331:, whereby entry of the punch
appears in the drawings, the outer diameter thereof is
within the sleeve member is stopped by abutment of the
slightly less than the diameter of the upstream shank
punch ?ange forming surface 34 against upstream end
one portion of said assembly during the ?ange forming
section 33b. The latter section may or may not be hol
low. As also appears, the inclined ?ange ‘forming sur
surface 55 on said sleeve member.
The opposite end of the shearing tube is tapered as at
face 34 and piercing or cutting surface 35 are inclined
56 and said tapered end at all times bears against an
to essentially the same extent and therefore lie generally 30 inclined surface 57 on leg portion 58 connecting with an
parallel one with the other.
arm portion 59 of a horizontally slidable generally T
To provide a resilient cushioning action during pierc
ing and ?ange formation, to prevent scratching of the
shaped member 60. The member 60 is supported for
horizontally slidable movement upon the upper surface
wheel cover 10 by the punch 31, and to urge the wheel
of the die base plate 37, and in FIGURES 2 and 3 it will
cover and support means shelf portion 16 tiltably down 35 be noted that the arm portion 59 of said member 60 has
wardly during punch travel, the punch shank or active end
tapering cam surfaces 60a and 60b formed thereon. The
33 may mount thereabout a cushioning member 36,
arrangement of parts prior to the ?anging operation is
shown the FIGURE 1 prior to compression as having a
shown in FIGURE 2, and at this time the arm portion 59
generally tubular shape. The cushioning member 36 may
have a tapered lower surface 36a which corresponds gen
erally with the inclined cutting face 35 on the punch
active end 33. The cushioning member 36 during the
steps of the instant process is shown in FIGURES 1, 2
and 3, and the compression thereof will be described
speci?cally hereinafter.
The die assembly 20 of the apparatus A of this inven
tion comprises a base portion 37 apertured at 38 and 39,
the former opening 38 receiving the leg member 28 of
the punch assembly 26 during the ?ange forming opera
tion, and the latter opening 39 being in the nature of a
chute to direct cut pieces therethrough from the piercing
step. The die base portion 37 preferably mounts upon
of the slidable T-shaped member 60 is held rigid by the bar
member 29 on the punch assembly depending leg 28, to
provide a ?rm support for the slidable sleeve member 50
during the shearing operation. However, subsequent to
shearing and during ?ange forming the sleeve member
50 slides downwardly along the inclined surface 57 of
45 the T member leg portion 58, by reason of the release
of abutting contact between the T member arm portion 59
and the bar portion 29 on the punch assembly leg 28, as
shown in FIGURE 3.
To slidably withdraw the T-shaped member 60 during
descent of the punch assembly 26, and speci?cally when
the leg portion 28 thereof proceeds vertically downwardly
from the position of FIGURE 2 to that of FIGURE 3, the
arm portion 59 of the T-shaped member 60 mounts
resilient means in the manner of FIGURE 4. At opposite
Also mounted upon the upper surface of the die base
ends of the ‘arm portion 59 there is received a pair of pin
37 is a die supporting member 41, shown in FIGURE 4
means 61 in openings 62 provided in said ann portion.
to be of general T-shape in plan. The die supporting
The openings 62 each have a relatively large diameter
member 41 may be secured to the die base portion 37
portion 63 at one end of which there is bottomed spring
by screw means or the like 42, and the die support 41
means 64 encircling the pin means 61 and bottoming at
has a stepped bore 43 extending partially therethrough 60 its opposite end against surface 65 formed on the die
and receiving a die collar member 44. The die collar
support 41. It may be noted that the die support member
member 44 may be seen to be provided generally cen
41 further has a tapered surface 66 under which may
trally of its axial length with a radial ?ange 45 seated
slide the similarly shaped surface 57 on the leg portion
in the stepped bore 43 in the die support 41 and through
58 of the T-shaped member 60. It may now be seen that
which may pass screw means or the like 46 to attach
the spring means 64 resiliently urges the T-shaped mem
65
the collar member 44 to the die support member 41.
ber 60 rearwardly or to the right as viewed in FIGURES 2
Additional attaching means may take the form of hori
and 3, slidably lowering the shearing sleeve 50 along its
zontally extending screw means or similar devices 47.
inclined bottom surface 56 on the inclined surface 57
It may be noted from the drawings that the upper
gf the leg portion 58 forming a part of the T-shaped mem
surface of the collar member ?ange 45 lies generally
er ‘60.
?ush with the upper surface of the die support member 70 The relative position of the parts of the die apparatus
41, and upwardly therefrom the collar member 44 is pro
A prior to piercing and ?ange ‘formation, and the loca
vided with an annular neck portion 48. The inner and
tion of the wheel cover 10 with respect thereto, are shown
outer diameters of the neck portion 48 may be seen to be
in FIGURE 1. It may be noted therefrom that the
non-concentric, and at the upstream end of said neck por 75 adjacent portion of the table support shelf 16 with wheel
its upper surface a block member 40 to guide the punch
assembly upright 28 during its travel.
3,053,210
5
6
cover 10 thereon is disposed at a higher elevation than
the surface 49a of the die collar member 44. When
shank 33. The ?ange 12b is accordingly formed with
out wiping thereon by the die tube 50, and it now may
lowering motion is imparted to the punch assembly 26,
be seen that burrs or other sharp surfaces are not pro
duced. As a result, injuries to workman are removed
the wheel cover annular dished portion 12 is contacted by
the annular cushion 36 surrounding the punch shank 33 to
tilt or pivot the table support shelf portion 16 in ‘a gen
from this source, and the necessity of a ?nishing opera
tion is further removed.
It is of course appreciated that various changes and
modi?cations may be made in the method and apparatus
spring 25 to lower the wheel cover 10 to essentially the
herein disclosed without departing from the novel con
position shown in FIGURE 2.
vWhen so lowered, the shelf portion 16 for the wheel 10 cepts of the present invention.
I claim as my invention:
cover 10 occupies the position more or less rearwardly of
1. Apparatus for metal piercing and ?ange operations
the die collar member 44, and particularly, to the rear of
upon wheel covers and the like, comprising a punch mem
the neck portion 48 thereof. The wheel cover 10 is
ber having an active end provided with piercing and
deposited upon the arcuately inclined mouth portion 49
?ange forming surfaces, a die base, a supporting mem
of the die collar neck portion 48 and closely spaced from
ber rigidly mounted on said base and having a collar
the arcuately inclined mouth 51 of the shearing sleeve 56.
portion and a sleeve portion slidably received in said
Essentially simultaneously, the shearing surface 35 on the
collar portion and provided respectively at one end with
punch active end 33 penetrates the wheel cover dished
?ange forming and cutting surfaces cooperating with the
portion 12 and effects a rapid and clean shearing action
?ange forming and piercing surfaces on the punch mem
in cooperation with the shearing surface 52 of the sleeve
erally clockwise direction in opposition to the bias of the
member 50. ' A round slug 12a is removed therefrom, and
ber, the opposite end of the sleeve portion being provided
this is shown in FIGURE 2 descending through the sleeve
member 50 from which it will pass into ‘and through
an elongated slot 67 in the leg portion 58 of the T-shaped
with an inclined surface thereon, and a member pro
50 is ?rmly supported along its inclined bottom surface
‘56 upon the similarly shaped surface 57 on the leg por
tion 58 of the T-shaped member 60. In other words,
surface being essentially stationary during piercing to
restrain the sleeve portion during said piercing and be
vided with an inclined surface seating thereon the inclined
end of the sleeve portion and being at all times spaced
member 60.
25 from the active end of the punch member and away from
It is to be noted that at this time the sleeve member
engagement therewith, said member with the inclined
only a minor amount of movement of the punch assembly
upright 28 occurs relative to punch movement, so that as
piercing or shearing action occurs the mating surfaces on
the arm portion 59 of the member 60 and on the bar por
tion 29 remain in contacting relation and no movement
of the T-shaped member 60 takes place. It is to be fur
ther observed that during piercing the annular cushioning
member 36 is substantially compressed to a bulbous
shape as shown in FIGURE 2, thereby ‘applying a rela
ing slidable upon the die base to move the sleeve portion
inclined surface along the inclined surface of said mem
ber with inclined surface, thereby moving the sleeve por
tion relative to the collar portion and in the direction of
punch member travel during ?ange formation to prevent
a ‘wiping action by said sleeve portion and the production
of relatively sharp burrs on the ?ange.
2. Apparatus for metal piercing and ?ange operations
upon wheel covers and the like, comprising a punch mem
ber having an active end provided with piercing and
tively great force area against the wheel dished portion
?ange forming surfaces, a die base, a supporting mem
12 to hold the same ?rmly against any substantial move 40 ber rigidly mounted on said base and having a collar por
ment.
tion and a sleeve portion slidably received in said collar
After piercing has taken place as described, and upon
continued descent of the punch assembly 26, the bar por—
portion and provided respectively at one end with ?ange
forming and cutting surfaces cooperating with the ?ange
tion or cam member 29 on the assembly upright 28 rides
forming and piercing surfaces on the punch member, a
downwardly on the mating surface of the arm portion 59 45 member slidably mounted on the die base and seating
of the T-shaped member 6!}, until said surfaces are es
the opposite end of the sleeve portion and being at all
sentially completely out of contact. As this sliding con
tact takes place, the spring means 64 expand to resiliently
times spaced from the active end of the punch member
impart horizontal slidable movement to the T-shaped
member 60, whereupon the shearing sleeve 50 slides down
contacting the slidably mounted member during piercing
and maintaining the slidably mounted member essentially
stationary during piercing to restrain said sleeve portion
wardly upon the inclined surface 57 on the leg 58 of the
T-shaped member 60. This horizontal sliding movement
of the T-shaped member 60 occurs simultaneously with
?ange formation, as shown in FIGURE 3. The ?ange
formed is designated therein as 12b, and it will be ob
and away from engagement therewith and a cam member
against movement, said cam member being movable with
the punch member to release the slidably mounted mem
ber for slidable movement along the die base, causing
the sleeve portion to move within the collar portion and
served that the ?ange is formed by cooperating action of
the surface 490 on the die collar neck portion 48 and the
?ange forming surface 34 and relatively greater diam
eter portion 33b on the punch shank 33. It is important
to note that when ?ange formation is being effected, the
in the direction of punch member travel during ?ange
formation to prevent a wiping action by said sleeve por
tion and the production of relatively sharp burrs on the
shearing sleeve 50 has advanced to a downstream loca
tion, ‘as shown in FIGURE 3, and accordingly provides no
resistance to ?ange formation, nor does it in any Way
upon wheel covers and the like, comprising a punch mem
smear or wipe the ?ange 12b to provide relatively sharp
burrs thereon in the manner of the prior art method.
Thus, by providing slidable movement of the shearing
tube 50 relative to the die collar 44 subsequent to the
shearing or piercing step, and by the provision of punch
and die surfaces as illustrated and described, the shear
ing sleeve 50 has no resistive action during ?ange forma
tion, and the shaping of the Wheel cover dished portion
surrounding the pierced opening is effected only by the
?ange.
3. Apparatus for metal piercing and ?ange operations
ber having an active end provided with piercing and
?ange forming surfaces, a die base, a supporting member
rigidly mounted on said base and having a collar por
65 tion and a sleeve portion slidably received in said collar
portion and provided respectively at one end with ?ange
forming and cutting surfaces cooperating with the ?ange
forming and piercing surfaces on the punch member, a
member ‘slidably mounted on the die base and seating the
70 opposite end of the sleeve portion and being at all times
spaced from the active end of the punch member and
away from engagement therewith, said slidably mounted
member being provided with a cam surface, a cam mem
die collar surface 49c and the ?ange forming surface 34
ber movable with the punch member and free of cam
and relatively larger diameter portion 33b on the punch 75 mmg contact with the cam surface on the slidably mount
3,053,210
7
8
ed member during piercing, said cam member and cam
surface sliding one upon the other during ?ange formation
and the slidably mounted member sliding upon the die
operations upon wheel covers and the like, comprising a
punch member having an active end provided with shear
ing and ?ange forming surfaces, a die base, a supporting
member rigidly mounted on said base and having a col
lar portion and a sleeve portion slidably received in said
collar portion and provided respectively at one end with
base during said formation, thereby moving the sleeve
portion relative to the collar portion and in the direction
of punch member travel during ?ange formation to pre
vent a wiping action by said sleeve portion and the pro
?ange forming and shearing surfaces cooperating with
duction of relatively sharp burrs on the ?ange.
4. Apparatus for metal piercing and ?ange forming
operations, comprising a punch head, a punch member
mounted by said punch head and having an active end
provided with shearing and ?ange forming surfaces, a
the ?ange forming and shearing surfaces on the punch
member, a member seating thereon the opposite end of
the die sleeve portion and being at all times spaced from
the active end of the punch member and away from en
member and provided with a recess therein, a collar mem
gagement therewith, said slidable member being essen
tially stationary during shearing to restrain the sleeve por—
tion during said shearing and being slidable upon the die
ber seated in the die support recess and having an up
15 base to move the sleeve portion relative to the collar
die base member and a die support mounted by said base
standing neck portion providing a ?ange forming surface
cooperating with the punch member ?ange forming
portion and in the direction of punch member travel dur
ing ?ange formation to prevent a wiping action by said
surface, a tubular shearing member received in the col
sleeve portion with the production of relatively sharp
lar member and having a cutting surface at one end co
operating With the punch shearing surface, the opposite
burrs on the ?ange, and support means including a
bracket portion connecting with the die base and a shelf
end of the shearing member being provided with an in
clined seating surface, a generally T-shaped member slid
portion movably connected to said bracket portion and
having yieldable biasing means acting on said shelf por
able upon the die base member and having an arm por
tion provided with a cam surface and a leg portion con
nected to said arm portion and inclined at one end for
tion for supporting the wheel cover thereon for transla
tory movement from a generally horizontal position at
which the shelf portion and the cover are supported above
seating thereon the inclined surface of the shearing mem
ber, a cam member connecting with the punch head and
arcuate path at which the wheel cover is deposited on
free of camming contact with the cam surface on the arm
said collar portion and spaced above the sleeve portion.
the die member collar portion and through a substantially
portion of the T-shaped member during shearing, and
resilient means urging the cam surface on the arm por~ 30
tion and cam member in sliding camming contact to lower
the shearing member by slidable movement of its in
clined surface on the leg portion inclined surface to pre
vent a widening action by the shearing member against
the ?ange during its formation and thereby preventing
burrs from being produced thereon.
5. Apparatus for metal piercing and ?ange forming
References Cited in the ?le of this patent
UNITED STATES PATENTS
155,110
Robinson ____________ __ Sept. 15, 1874
2,230,043
2,554,916
Moran ______________ __ Jan. 28, 1941
Miller _______________ __ May 29, 1951
2,878,767
2,887,157
Lyon _______________ __ Mar. 24, 1959
Rehdorf _____________ __ May 19, 1959
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