вход по аккаунту


код для вставки
Jan. 7,1947.
7 H. s. DUNCAN
Filed Aug. 2, 1943
2 Sheets-Shéet 1
' Fig.4;
Hersh'el EDUnoan,
His Attorneg.
Filed Aug. 2, 1945
2 sheets-gheet
Hershel B.Duncan,
by ""W
His Attorney.
Patented Jan. 7, 1947
rear " @FFECE
Hershel B. Duncan, Detroit, Mich, assignor to
Carboloy Company, Inc, Detroit, Mich, a cor
poration of New York
Application August 2, 1943, Serial No. 497,029
9 Claims. (Cl. 18-12)
The present invention is a process and appa
ratus for preparing powdered materials such as
powdered cemented carbide ingredients for ex
trusion and an apparatus for extruding such ma
terial. A cemented carbide consists of a mix
ture of one or more hard metal carbides and a
uniform internal diameter and provided with a
recessed screw threaded portion I3 at its lower
end to which avscrew threaded ring Id, having the
same internal diameter as cylinder I2, may be
secured. The lower end of the hollow cylinder
or ring i4 is screw threaded and engages a screw .
threaded cap or closure member I5. A layer of
thin paper or other suitable material il' covers
the inner ?at surface of the cap I5 to separate
the steel cap and powder. The material in con
closes a process for extruding such material. In
tainer II may consist of a powdered mixture of
the Taylor process it has been customary to
cementing metal therefor the mixture having
been sintered at a relatively high temperature.
Taylor Patent 2,271,960, February 3, 1942, dis
cemented carbide ingredients and dry starch, for
example tungsten carbide, cobalt and starch.
row, perforated holder. Thereafter the disks in
The quantity of powdered material placed in the
the holder are plasticized and then extruded.
The quantity of powdered material which can 15 container is such that when compressed to the
desired extent it will exactly fill the ring Ill,
be placed in such perforated holders is relatively
After the mixed powdered materials have been
small and the holder requires frequent re?lling
placed in container ll they may be consolidated
and cleaning.
to a limited extent by means of vibrations im
It is one of the objects of the present inven
tion to provide a cylindrical or ring shaped holder 20 parted thereto. A perforated metal disk I8 hav
place a series of compressed disks in a long, nar
which may be ?lled with a relatively large quan
tity of compressed powdered material suitable for
ing a diameter substantially equal to the inner
diameter of the container H and provided with
openings I9 extending therethrough is placed on
extrusion. It is a further object of the inven
top of the mixed powdered material. The open
tion to provide means whereby a plurality of
ings or holes I9 which extend through the disk
such loaded rings may be secured in series with 25 it comprises an upper enlarged portion 2E and
one another and an extrusion die whereby a large
a constricted lower portion 2!. The openings l9
quantity of plasticized powdered material may
permit easy removal of occluded gases from the
be extruded in a continuous operation. Another
mixed powdered material as it is compacted in
object of the invention is to provide a relatively
container II and ring M. A relatively heavy
large, pressed powdered mass having a uniform 30
metal plug or plunger 22, provided with a shoul
structure which permits even penetration of a
der 23 at its upper end, is positioned on top of
solution employed in plasticizing the mass. It
the disk I8. The plug 22 is provided on its lower
is a further object to provide a simpli?ed ap
surface with a spiral groove ‘24 which communi
paratus for extruding powdered plastic material.
cates with a plurality of openings 25 which ex
Other objects will appear hereinafter.
tend longitudinally through the plug. The plug
The novel features which are characteristic of
‘22 and perforateld disk i8 tend to provide a
my invention are set forth with particularity
pressed powder compact or ingot which has a
in the appended claims. The invention itself
uniform structure and substantially the same
however will best be understood from reference
to the following speci?cation when considered 40 density throughout its mass.
The powdered ingredients in‘ container II usu
in connection with the accompanying drawings
are consolidated by vibration until the lower
in which Fig. l is a vertical cross section of an
surface of the shoulder 23 on the plug 22 is spaced
apparatus which may be employed in carrying
about one-half inch from the upper end of the
my invention into effect; Fig, 2 is a vertical cross
section of the apparatus shown in Fig. 1 after the 45 container H. The container I! is then placed
in a hydraulic press and pressure applied to the
powdered material has been compacted therein;
plug 22 and the powdered material an to compact
Fig. 3 is a vertical sectional View of the com
it to the desired extent. Pressure is applied to
pacted material within the ring holder after the
the powdered material until the shoulder 23
compacted material has been saturated with a
comes substantially in contact with the upper
water glycerine solution; Fig. ll is a View in ele
end of the container II at which time the pow
vation of the apparatus illustrated in Fig. 3;
dered material within the ring Will ‘be compressed
Fig. 5 is a vertical cross sectional view of a plu
so as to ?ll the ring Id completely as indicated
rality of rings filled with compacted material
in Fig. 2 of the drawings. Ring It with the
and superimposed one on the other and con
nected to an extrusion die; while Fig. 6 is a view 55 pressed powdered material therein may now be
removed fro-m the press and if desired stored for
in elevation of the apparatus illustrated in Fig. 5.
future use.
In carrying out the present invention the
mixed powdered material It to be extruded is
if the powdered material is intended for imme
diate rather than future use it is thoroughly im
low; relatively heavy metal cylinder I2 having a 60 pregnated at this time with a Water glycerine
placed in a container II which comprises a hol
solution. In carrying out the impregnation proc
ess the ring M is provided at opposite ends there
of with perforated plates 26 and 21 which bear
against feltgaskets 28 and 29 respectively and
after applying pressure to said plasticized mate
rial to extrude it from said member and through
a die.
5. The process for preparing loose, powdered
material for extrusion which comprises compress
31. The water glycerine solution is then applied
~ing the powdered material by longitudinal pres
to the compressed powdered material in the ring
sure into a compact mass having a width sub
in any well known manner, for example substan
stantially greater than its length and wholly ?ll
tially as set forth in the above-noted Taylor pat
ent. The uniform structure of the pressed pow 10 ing a hollow cylindrical member, plasticizing said
material within said member, connecting a plu
der permits even penetration by the solution
rality of said members in series with one another
Thereafter the impregnated powder is heated to
. and with an extrusion die, and applying pressure
cook the starch in the pressed powder and then
are held in place by screw threaded rings 30 and
extruded in a well known manner.
The water
glycerine solution and cooked starch form a plas~
ticizing medium for the cemented carbide in
gredientswhich renders them capable of extru
If desireda plurality of rings 14 containing
pressed powdered material therein may be as
sembled in series and held together by screw
threaded rings 32 engaging the upper screw
thread. on one ring and the lower screw thread
on. an adjacent superimposed ring as clearly
terial for extrusion which comprises a container
vhaving two aligned, hollow, cylindrical members,
said members having equal inside diameters and
equal outside .diameters,.-the inside diameter of
each of said members being substantially greater
than the length of that member, a perforated
plate positioned within said container and a
ventilated plunger for applying pressure to said
indicated in Figs. 5 and 6 of the drawings. An ,
extrusion die 3-3 may be secured to one end of
the combined rings while pressure may be applied
to the opposite end of the combined rings
throughv a plate 3% to force the plasticized pow
dered material through the extrusion die. A layer .
of thin
at one end of said connected members to extrude
the material therein.
6. An apparatus for vpreparing powdered ma
may be employed to separate
plate and to powdered material within said can
tainer, said plunger having means cooperating
with said perforations to permit escape of gases
from said powdered material, means for limiting
the application of'pressure to the material within
said ring, said means comprising a ?ange on said
plunger, the combined length of the portion of
said plunger below said ?ange and the thickness
of said perforated plate being equal to the lengt
the pressed powder ‘from the plate 31%. Satisfac
tory results may be obtained employing rings
about 21/2 inches in diameter and approximately
1% inches long. By connecting a plurality of
of one of said cylindrical members.
An apparatus for extruding powdered ma
terial, said. apparatus comprising a plurality of
hollow, cylindrical members each having an inside
diameter substantially greater than its length and
adapted to be ?lled separately and under pres
a single operation.
What I claim asnew and desire to secure by 40 sure with powdered material to be extruded and
thereafter connected together, adjustable means
Letters Patent of the United States, is:
mounted on the outer surfaces of said members
l. The process for extruding powdered metal
for-connecting them in series with one another,
lic In’. rial which comprises compressing said
adjustablemeans connecting the lower cylindri
material entirely within. a hollow container until
cal member withv an extrusion die, ‘and means for
said container is wholly ?lled, impregnating the
applying pressure to the material in said members
compressed material while in said container with
to extrude it through said die.
a liquid to plasticize it, and thereafter applying
8. The method for extruding mixed, powdered,
said material in said container to ex
cemented canb-ide ingredients which comprises
trude it through a die.
such rings in series with one another and with
the extrusion die, it is possible to continuously
extrude a large quantity of plastic material in
applying pressure in a longitudinal direction to
the loose ‘powdery-and permitting escape of air
therefrom :while compressing the powder into a
dense, compact mass having a diameter substan
2. The process for preparing powdered material ,
for extrusion which comprises applying pressure
in .a longitudinal direction to loose, powdered,
metallic material while permitting air to escape
therefrom and until said compressed powdered
material wholly ?lls a hollow member having a
width substantially greater than its length and
thereafter impregnating the compressed pow
dered material While in said container with a liq
uid to plasticize it and render it suitable for ex
trusion therefrom.
3. The process of preparing loose, powdered
material for extrusion which comprises applying
pressure to said loose powdered material to form
tially greater than its length and-wholly ?lling a
ring-shaped container, plasticizing the com
an L!
pressed material in'said container by impreg~
hating it with aliquid under pressure and there
after applying pressure to said plasticized" mate
rial to extrude it from said container.
9. An apparatus for extruding mixed powdered
cemented carbide ingredients, said apparatus
comprising a plurality of hollow container mem
bers, each of vsaid members being approximately
one and one-half inches long and about two and
.one~hal_f inches wide within which the powdered
cylindrical member until. said-member is wholly
?lled and thereafter adding a liquid to said ma 65 material to be extruded may be compacted until
wholly ?lled and then impregnated with a liquid
terial in said member to plasticize it.
plasticizing medium,>moans detachably connect
4. The process for extruding powdered, metal~
?lled, members in series with each other,
lic material which comprises compressing said
material into
dense, compact mass having a 70 an extrusion die connected at one end of said
series connected members and means atlthe other
diameter substantially greater than its length
end of said series connected members whereby
and wholly ?lling a ring-shaped container mem
pressure may be applied to the material therein
ber, impregnating the compressed material in said
to extrudeit through said die.
container with a liquid to plasticize it, and there
it into a dense, compact mass within a hollow
Без категории
Размер файла
596 Кб
Пожаловаться на содержимое документа