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Патент USA US2410676

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Nov. 5, 1946.
J. s. NIELSEN
2,410,676
APPARATUS FOR FORMING SHEET METAL
‘
Filed Oct. 16, 1943
James S, N/e/sen
Patented Nov, 5, l ‘
,
2,410,676
.UN'ITED' STATES
' 12,410,875
I
.
APPARATUS FOR FOG SHEET
‘EAL
lanes 8. Nielsen, Stow, @hlo, assignor to its - "i
year Aircraft Got-partition, Akron, Ohio, a-cor
‘porationoi Dela
1-:
Application October iwitdt, Serial No. 506,474 I
5 Claims. - (Cl.
E
This invention relates to apparatus for form!
ing sheetmetal, and, moreparticularly, is con- _
cerned with improved apparatus for use in con
junction with rubber platen presses wherein sheet
metal parts are ?anged around or shaped over
forming-dies.
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4),
‘
.
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It is old and well known to employ so-called
rubber platen presses for shaping sheet metal.
Apparatus of this type possesses the important
edge, and means for e?ecting relative movement
between the shaping means and the support to
progressively bend the overhanging edge around
the support with a progressive slipping oi’ the
overhanging edge out from between the shaping
means.
For a better understanding of the invention,
reference should be had to the accompanying
drawing, wherein Figure 1 is a vertical cross-sec
_ characteristic that only one die is needed, instead 10 tional view through typical apparatus incorpo
of .a mating male and female die, with the rub
rating the invention (with the sectional view be
ing taken on line i~+l of Figure 2-) ; and Figure 2
sure over the entire area of a piece of sheet metal
is a plane view of a portion of the apparatus as
positioned over the forming die. However, in
taken substantially on line 2-2 of Figure 1.
forming ?anges on sheet metal by apparatus of 16 Having speci?c reference to the drawing, the
this type, and, speci?cally, where such ?anges
numeral l0 indicates generally a bed or platen
are curved or contoured, as is so often the case,
adapted to mount thereon a support or die‘ it
it has usually been necessary to partially form
for a piece of sheet metal It, with the sheet
the sheet metal with the rubber platen apparatus,
metal being supported so as to have an edge
and follow this forming operation with extensive .20 portion overhanging the die or support It. The
and laborious hand-finishing operations or other
overhanging edge of the sheet metal it is adapted
machine-?nishing operations.
to be adjustably gripped by contoured shaping
It is the general object of this invention to‘ means, indicated as a whole by the numeral it,
avoid and overcome the foregoing and other ob
which conveniently take the form, as illustrated,
jections to and dlmculties of known rubber 25 of a pair of opposed metal shoes, draw-blocks, or
platen-press apparatus and the like, by the pro
dies in the form of plates it and I8, having one
vision of improved means for facilitating form
or more aligning pins 20. The plates it and it
ing curved and contoured edges on sheet metal
of the shaping means are adjustably secured to
in a single rubber pressing operation.
gether by any suitable means, such as threaded
Another object of the invention is the provi 30 studs 22, secured in the plate It, extending
sion of improved apparatus of relatively inex
through holes in the plate it, and receiving
ber platen serving to apply relatively high pres
pensive, readily operated'character which facil
itates forming contoured ?anges and'the like on
sheet metal during a rubber platen-press sheet
thumb nuts 2%.
.
Some means are provided for mounting the
shaping means It so that the metal-gripping
metal-forming operation,
35 edges thereof can have relative movement with
Another object of the invention is the provi
respect to the support 82 for the sheet metal.
sion of apparatus of the character described and
One particularly practical way of achieving the
wherein an overhanging sheet metal edge is
desired result is to form the plate member It of
gripped by adjustably actuated clamping plates
a wedge shape and with the plate tapering to a
to provide a progressive bending and stretching 40 relatively thin edge adjacent the die or support
of the sheet metal edge and a progressive slipping
l2. When the plate It is shaped in this way.
of the sheet metal edge out‘ from between the
the contoured shaping means I5 have bodily
clamping means.
movement as a whole of pivoting character from
The foregoing objects of the invention, and‘
the full-line-position shown to beyond the dot
other objects which will become apparent as the 45 ted-line position shown. The movement of the
description proceeds, are achieved by the provi
contoured shaping means from the full to the
sion of a method for forming sheet metal which
dotted-line position is achieved by ‘any desired
includes the steps of gripping an edge to bend
means, for example by the use of a rubber platen
progressively and simultaneously to stretch the
including a rubber body 30 supported in the metal
edge to the desired contour. The apparatus of 50 platen member 82. The rubber body 30 not
the invention includes in combination, means for
only serves to force the sheet metal 14 into shaped
supporting sheet metal with an overhanging edge,
contact with the die or support l2 but also serves
a pair of contoured shaping means, means for
to-apply pressure to the top plate It of the con
adjustably clamping the shaping means against
toured shaping means I 5, and this pressure causes
each other on opposite sides of the overhanging
the contoured shaping means I! to tilt with a
9,410,070
.plvotingactioni’romthemll-linetoandbeyond
.
4
During the movement or the contoured shap
ing means I‘ from the rull-line position to and
beyond the dotted-line position, the overhanging
edge oi’ the sheet metal gripped by the contoured
shaping means progressively slips out from be
gripping means, independent of the overall con
?guration oi the main die,- used only adjacent
said curved die portions and coniorming to the
contours thereof, the outer bottom portion of
said gripping means being in sliding and tilting
contact with said die support and its inner por
tion being in slidable and adjustable clamping
tween the shaping means to cause a progressive
engagement with the metal sheet, so that the
the dotted-line Politico.
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straight edge portions oi said sheet are ?anged
bending and a simultaneous progressive stretch
in! ‘of the overhanging sheet metal edge, so that 10 directly by the rubber platen, but which acts upon
the curved portions by means of said gripping
the edge oi’ the sheet metal is contoured and
shaped to the particular form desired. From
means in order to obtain smooth wrinkleless
the drawing it will be recognized that a longi
tudinally curved ?ange can be formed on the
3. Apparatus for forming sheet metal, com-_
?anges.
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sheet metal edge, and the ?ange can extend at 15 prising a die support, a die resting on said sup
port and having straight or substantially straight
any desired angle with respect to the main body _
oi’ the sheet metal.
as well as curved circumferential contour por
tions. said die carrying the sheet to be formed
From the foregoing, it will be recognized that
with its edges overhanging, rubber platen means
- the objects of the invention have been achieved
by the provision of simpli?ed and improved 20 movable to and from the die, and- a. supplemen
tary, relatively short, tiltable gripping die in
means and method for forming sheet metal and
dependent of the overall con?guration oi the
particularly for shaping curved and contoured
main die and adjustable for various sheet thick
?anges on sheet metal parts during a rubber
platen-pressing operation. The ?anges are
nesses, in sliding contact with said die support
formed to the desired shapes and contours sub 25 and in slidable engagement with only the curved
edge portions of the metal sheet in order to pre
stantially without spring-back and to substan
vent wrinkling of said curved portions.
tially eliminate the necessity for subsequent
hand-forming or additional shaping operations.
4. Apparatus for forming sheet metal, com-,
prising a die support, a die resting on said support
01 course, any number of contoured shaping
means, such as particularly illustrated, can be '30 and having straight or substantially straight as
well as curved circumferential contour portions,
employed, and the contour oi’ the shaping means
said die carrying the sheet to be formed with its
can be widely varied to suit any speci?c re
edges overhanging, rubber platen means movable
quired shaping operation.
to and from the die, and at least one supplemen
While, in accordance with the patent statutes,
the invention has been speci?cally illustrated 35 tary ?anging die independent of the overall con
?guration of the main die in cooperation with
and described, it will be understood that the in
‘said ?rst mentioned die and said rubber platen
vention is not limited thereto or thereby, but
means for ?anging only the curved portions of
that the scope of the invention is de?ned in the
said metal sheet, said supplementary die being
appended claims.
I claim:
.
40 wedge-shaped in cross section with its thin por
tion gripping the sheet edge and with its wide
1. Apparatus for shaping sheet metal and in
portion resting in sliding and tilting relation on
cluding a die support, a die on the support, said
said die support.
die carrying and positioning the sheet with an
5. Apparatus for forming sheet metal, com
overhanging edge, multi-part contoured shaping
means adapted to grip the overhanging edge 0! 45 prising a die support, a die resting on said sup
port and having straight or substantially straight
the sheet, the lowermost part of said shaping
as ‘well as curved circumferential contour por
means having a wedge shape in vertical section
tions, said die carrying the sheet to be formed
and resting loosely on the die support in pivotal
with its edges overhanging, rubber platen means
relation therewith, said shaping means being
pivotally supported on the die support at a point 60 movable to and from the die, and a separate
supplementary ?anging die in cooperation with
spaced from the die and to the underside of the
the die and said rubber platen means, said ?ang
plane of the overhanging edge, a rubber block,
ing die including means for clamping with ad
and means for forcing the rubber block against
‘justable pressure on the overhanging edge of
the upper surface of the sheet to form it into the
die and simultaneouly to rock the shaping means 65 the sheet adjacent the curved portions of the
die, that portion of the ?anging die remote from
about'the pivotal support progressively to bend
the sheet resting in tilting and sliding relation
and stretch the overhanging edge.
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on the die support, so that movement of the rub
2. Apparatus for forming sheet metal, com
ber platen means against the die will ?ange the
prising a die support, a die resting on said sup
port and having straight or substantially straight 60 overhanging sheet edge against the straight por
tions of the die and will simultaneously move
as well as curved circumferential contour por
the ?anging die with a tilting and wiping move
tions, said die carrying the sheet to be formed
ment to form a curved ?ange in the sheet with
with its edges overhanging, rubber platen means
out wrinkling the curved ?ange.
movable to and from the die, and supplementary .~
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JAMES S. NIEISEN.
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