Improvements in and relating to Dies for Forging and Pressing. Purposes.
Year: 1893

page_text: Date of Application, 15th July, 1893
Complete Specification Left, 3rd Mar, 1894-Accepted, 21st Apr., 1894
PROVISIONAL SPECIFICATION.
Improvements in and relating to Dies for Forging and Pressing.
Purposes.
I, ERNST HAMMESFAHR, of 7 Foche, Solingen, in the Empire of Germany, do
hereby declare the nature of this invention to be as follows:-
My invention relates to dies for forging and pressing purposes, and consists in
combining such dies with stopping surfaces. The stopping surfaces may either be
made in one piece with the dies or arranged upon or beside these dies at a suitable
distance therefrom. In the latter case the dies consist of several parts which in
their entirety constitute the subject of my said invention.
These dies made of one or more parts possess stopping surfaces at one or more
points, which surfaces project a little above the die faces proper and prevent the
latter from coming in contact with each other, for the purpose of obviating the
wear and protecting the edges of the dies from damage so as to produce forged or
pressed articles which always present exactly equal transverse sections.
I will first describe an arrangement of press dies which have stopping surfaces
formed in one piece with them and which may for example be used for pressing
keys. A cavity corresponding to half the key is provided in each of the dies.
The stopping surfaces project a little from the die faces and when the two dies
are pressed together will bear upon each other so as to prevent the contact of the
said die faces.
Accordingly in the pressing operation the excess of material will on all sides find
an open space for its escape and for the formation of a bur of uniform thickness
equal to the total height of the two stopping surfaces pressed against each other.
As the die faces, and therefore the dies proper, cannot touch each other they will
be protected from damage such as for instance the breaking of the edges of the
dies. They can at most wear only by the formation of the bur, during which
however it cannot happen, as has heretofore been the case with quite smooth dies,
that the bur is pressed or squeezed off, thereby injuring the dies which wear rapidly
or even crack on receiving a blow or on being pressed.
All the articles forged or pressed by means of such dies will be of exactly the
same thickness, if care be exercised that in the operation the stopping surfaces
shall come in close contact. Moreover, when there is sufficient material, the dies
are well filled up at all points so that the articles will leave the die neatly pressed
ont and with a smooth and clean surface. When the articles are produced in the
hot state care must be taken to place them between the dies at as uniform a
temperature as possible, in order that by reason of unequal shrinking during the
cooling the uniformity of the dimensions may not be destroyed.
In another arrangement of dies which consist of two or more parts, the dies
proper are made with a plane face in the well-known manner, and the projecting
stopping surfaces are formed by separate pieces placed beside the said dies. This
arrangement enables the customary plane dies to be used directly for the aforesaid
pressing operation. Such separate pieces with stopping surfaces arranged beside
the plane dies may be placed at a greater or smaller distance from the latter.
Of course the stopping surfaces may be provided only on or beside a single die.
In this instance the other die will bear with its face which is plane throughout
upon the stopping surfaces of the first die, thus preventing a contact of the die
faces.
Such dies have the further advantages that the article is not so liable to become
fixed in the matrice, as the contact of the stopping surfaces causes vibration which

page_text: will loosen the article. The latter is consequently not pressed so firmly into the
swage.
Dated this 14th day of July 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in and relating to Dies for Forging and Pressing
Purposes.
I, ERNST HAMMESFAHR, of 7 Foche, Solingen, in the Empire of Germany, 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:-
My invention relates to dies for forging and pressing purposes, and consists in
combining such dies with stopping surfaces. The stopping surfaces may either he
made in one piece with the dies or arranged upon or beside these dies at a suitable
distance therefrom. In the latter case the dies consist of several parts which in
their entirety constitute the subject of my said invention.
These dies made of one or more parts possess stopping surfaces at one or more
points, which surfaces project a little above the die faces proper and prevent
the latter from coming in contact with each other, for the purpose of obviating
the wear and protecting the edges of the dies from damage so as to produce forged
or pressed articles which always present exactly equal transverse sections.
In the accompanying drawing,
Figure 1 shows a section of the top and bottom halves of the improved die and a
plan of one of the faces thereof respectively.
Figures 2 and 3 show modifications of the die, and
On
Figure 4 is a view illustrating a further modified arrangement of the die.
According to one form of my invention as shown in Figure 1, a indicates the
lower half of the die and b the upper half thereof, each of which may be made solid
or in one piece the said die being for example used for pressing or forming keys.
A cavity corresponding to half the key is provided in each half of the die.
the faces c of the die are formed stopping surfaces d which project a little from
the said faces and when the two dies ab are pressed together the said faces
will bear upon each other so as to prevent contact of the said die faces c.
Accordingly in the pressing operation the excess of material will on all sides
find an open space for its escape and for the formation of a burr of uniform
thickness equal to the total height of the two stopping surfaces pressed against
each other.
As the die faces c and therefore the dies proper, cannot touch each other they
will be protected from damage such as for instance the breaking of the edges of the
dies. They can at most wear only by the formation of the burr, during which
however it cannot happen, as has heretofore been the case with quite smooth dies,
that the burr is pressed or squeezed off thereby injuring the dies which wear rapidly
or even crack on receiving a blow or on being pressed.
All the articles forged or pressed by means of such dies will be of exactly the
same thickness, if care be exercised that in the operation the stopping surfaces
shall come in close contact. Moreover, when there is sufficient material, the dies
are well filled up at all points so that the articles will leave the die neatly pressed
out and with a smooth and clean surface. When the articles are produced in the
hot state care must be taken to place them between the dies at as uniform a
temperature as possible, in order that by reason of unequal shrinking during the
cooling the uniformity of the dimensions may not be destroyed.

page_text: In another arrangement shown in Figures 2 to 4 in which the dies are made of
two or more parts, the dies proper, a, b are made with a plane face in the well-
known manner, and the projecting stopping surfaces are formed by separate pieces d'
placed beside the said dies. This arrangement enables the customary plane dies to
be used directly for the aforesaid pressing operation.
Figure 4 shows an arrangement by which such separate pieces with stopping
surfaces d'arranged beside the plane dies ab may be placed at a greater or
smaller distance from the latter.
It will be understood that the stopping surfaces may be provided only on or
beside a simple dic. In this case the other die will bear with its face which is
plane throughout upon the stopping surfaces of the first die, thus preventing a
contact of the die faces.
Such dies have the further advantage that the article is not so liable to become
fixed in the matrice, as the contact of the stopping surfaces causes vibration which
will loosen the article. The latter is consequently not pressed so firmly into the
swage.
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:
A die for forging and pressing, characterized by the fact that on or beside the
said die are arranged stopping surfaces (d) which prevent contact of the die faces
in the pressing operation. -
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.