Improvements in Dies for Drawing Metal.
Year: 1892

page_text: Date of Application, 3rd May, 1892--Accepted, 4th June, 1892
COMPLETE SPECIFICATION.
Improvements in Dies for Drawing Metal.
I, EDWIN NORTON residing in Maywood in the County of Cook in the State of
Illinois, United States of America, Manufacturer, do hereby declare the nature of
this invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
The invention relates to dies for drawing metal into shapes.
The invention operates upon the principle of successively reversing the direction
in which the metal is drawn, and at each successive drawing turning the shape
previously drawn inside out.
The invention consists in a compound die operating to successively draw the
metal in opposite directions, the shape drawn by the first action being turned inside
out by the second action of the compound acting dies.
It also consists in the combination of a cutting die with said compound drawing-
die, operating to draw the metal in opposite directions.
It also consists in the combination, with the punch or male die and annular die
for drawing and reducing the shape and turning it inside out, of a sleeve surrounding
said annular die, so that the cylindrical or other wall of the metal shape to be
turned inside out will be supported and guided both inside and out on the inside by
the annular die and on the outside by said surrounding sleeve.
It also consists in the combination, with said punch and annular die, of a
pushing ring adapted to push against the end or edge of the metal shape which is
to be drawn and reduced by turning inside out, thereby facilitating the drawing
operation and relieving the metal to be drawn from undue strain.
It also consists in the combination, with a punch and annular drawing die for
drawing and reducing the metal shape by turning it inside out, of said pushing ring
and said sleeve surrounding said annular die.
According to the principle of this invention a shallow cylindrical cup of, com-
paratively large diameter, is first drawn or produced out of the sheet metal, and the
walls of such cup or shape are drawn' or turned around the curved or rounded edge
of an annular die, thus turning the cup or shape first produced inside out and
producing a deeper cup or shape of smaller diameter. To produce a cup or shape
of still smaller diameter the operation may be repeated.
It also consists in the novel devices and novel combination of parts and devices
herein shown and described, and more particularly pointed out in the claims.
In the accompanying drawings, which form a part of this Specification, and in
which similar letters of reference indicate like parts throughout all the figures,
Figure is a central vertical sectional view of a device embodying the
invention; and
Figure 2 is a similar view, on a smaller scale, showing the same device with the
cutting die omitted.
In the drawings, A represents the bed-plate of the press.
B is a female cutting die secured' thereto.
Cis a die-block having a cutting edge or die c, which operates in conjunction
with the female cutting die B, and having a female drawing-die c', which operates
in conjunction with the outer or male drawing-die face d of the annular die D. The
annular die D has an inner face or periphery d', operating as a female drawing-die
in conjunction with the punch or male drawing-die E, which reciprocates within' the
hollow die-block C.
Fis the follower or presser-ring; surrounding the annular drawing-die D; and
supported upon pins f from the rubber spring Fr
G is a metal tube secured to the bed-plate, and which supports the rubber

page_text: spring F¹, and through which the shapes, drawn by the dies D E, are discharged.
The annular die D has the usual projection or offset d' on its inner face to facilitate
the discharge of the work.
-
and
The operation is as follows: A sheet of metal being placed across the face of the
cutting-die B, the annular die-block C descends, thus causing its cutting-edge or
die c to cut out the blank in the usual manner, and as the die-block continues to
descend the blank is stamped or drawn down over the annular die D into the shape
shown in Figure 1 of the drawings. The next action is for the punch E to descend
and draw the inverted shape a inside out over the end of said punch E and through
the annular die D into the shape .c. During the first drawing operation of the
compound die the follower or presser F serves its usual function of pressing against
the blank, and keeping it smooth as it is drawn. During the reverse drawing or
second operation the blank or shape x is guided and supported and kept smooth by
the outer periphery of the annular die D, which supports it upon the inside,
also by the inner periphery of the hollow die-block C, which guides and supports
the shape upon its outside. In this latter operation this die block C serves
simply as a surrounding sleeve to support and guide the cylindrical wall of the
shape a upon the outside thereof during the reverse drawing operation, and it will
be obvious to those skilled in the art that this combination or feature of the
improvement may be practised without using the die-block C, either as a cutting-
die or as a female drawing-die for producing the first drawing operation-that is to
say, this feature of the improvement may be used in conjunction with a punch and
annular die for turning the shape inside out and entirely independent of the
compound die or cutting-die.
€
By providing an independent follower or presser sleeve H, surrounding the
punch E and inside the hollow die-block C, the die-block C can be withdrawn
during the second or reverse drawing operation, and thus permit the spring follower
or presser F to push against the end or edge of the shape to facilitate the reverse
drawing operation. This materially relieves the stock from strain during the
second or reverse drawing operation. It will of course be readily understood by
those skilled in the art that this pushing function of the ring F in the second or
reverse drawing operation may be used entirely independently of the blank
smoother or presser function, which the follower ring F has in the first drawing
operation.
As shown in Figure 2, the invention is applied to an already drawn shape, and
no cutting dies are of course employed in the compound die of Figure 2.
The improved compound die may be attached to any well-known form of com-
pound-acting press, or the several movable parts of the compound die may be moved
by hand, if desired. As the construction of presses is well known to those skilled
in the art, and as the improvement relates simply to the dies, it is not thought
necessary to herein show or describe a press.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is ==
1st. The improvement in drawing sheet-metal herein described, consisting in first
drawing a sheet-metal blank into a shallow cup shape of comparatively large
diameter, and then drawing such shape in the opposite direction into a deeper shape
of smaller diameter, the shallow shape first produced being turned inside out by the
second operation, and both operations being performed successively in one and the
same machine, substantially as specified.
2nd. The improvement in dies for drawing sheet-metal, herein shown and
described.
3rd. The combination, with a punch, of a female drawing die and an annular
drawing die having an outer periphery or face operating as a male die in conjunction
with said female die and an inner periphery or face operating as a female die in
conjunction with said punch, whereby the metal is drawn first in one direction and

page_text: then in the opposite, the shape first produced being turned inside out by the second
operation, substantially as specified.
4th. The compound die for first drawing a shape and then turning it inside out,
and thus producing a deeper shape of smaller diameter, consisting of a hollow die
block C, an annular die D, adapted to reciprocate within the cavity of said hollow
die C, and a punch E, adapted to reciprocate within said annular die D, said hollow
die-block C operating in conjunction with the outer periphery or face of said
annular die D to first draw the shape, and said punch E operating in conjunction
with the inner periphery or face of said annular die to turn the shape inside out,
and thus produce a smaller and deeper shape, substantially as specified.
5th. The combination with cutting-die B, of hollow die-block C, having a
cutting edge or die c, annular die D, and a punch or male die E, substantially as
specified.
6th. The combination, with a cutting-die B, of hollow die block C, having a
cutting edge or die c, annular die D, punch or male die E, and a follower or blank
smoother F, substantially as specified.
7th. The combination, with a punch and an annular die for drawing a metal
shape by turning it inside out, of a sleeve surrounding said annular die to aid in
supporting, guiding, and smoothing the peripheral wall of the shape to be drawn
and reversed or turned inside out, substantially as specified.
8th. The combination, with a punch or male die and an annular die for drawing
a metal shape by turning it inside out, of a pusher ring or device surrounding said
annular die and engaging the end or edge of the metal shape to be drawn to
facilitate the drawing operation, substantially as specified.
9th. The combination, with a punch or male die and an annular die for drawing
a metal shape by turning it inside out, of a pusher ring or device surrounding said
annular die and engaging the end or edge of the metal shape to be drawn to
facilitate the drawing operation, and a sleeve or guide surrounding said annular die
for supporting the peripheral wall of the shape to be drawn, substantially as
specified.
China IITOA A1 102 1000
Witnesses:
H. M. MUNDAY.
EDWIN NORTON.
EDMUND ADCOCK.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, Agents for the Applicant.