Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS2411379 A
Publication typeGrant
Publication dateNov 19, 1946
Filing dateOct 20, 1941
Priority dateOct 20, 1941
Publication numberUS 2411379 A, US 2411379A, US-A-2411379, US2411379 A, US2411379A
InventorsLanghammer Anthony J
Original AssigneeChrysler Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Apparatus for making briquettes
US 2411379 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

. 1.946- A. J. LANGHAMMER 2,411,379

APPARATUS FOR MAKING BRIQUETTES Filed 00%,. 20, 1941 fl.ii I lNvENTbR ANTHONY a. LHNGH/IMMER E- BY fdzzfiw.

ATTORNEYS.

Patented Nov. 19, 1946 umrap s raras PATENT OFFICE APPARATUS FOR MAKING BRIQUETTES Anthony J. Langhammer, Detroit, Mich., assign- I or to Chrysler Corporation, Highland Park, Mich., a corporation of Delaware Application October 20, 1941, Serial No. 415,114

This invention relates to an improved apparatus and method for'making briquettes from powdered metal materials.

More specifically, the invention pertains to an apparatus and method of this kind which is particularly adapted for producing briquettes of the above character which have a body portion of substantially uniform cross section and a tapered portion such as a body portion and ogive of a projectile.

One of the main objects of the invention is the provision of an apparatus and method of this kind which during compression of a charge of powdered metal particles into a briquette of pointed or conical end shape, subjects the particles of powdered metal in the pointed end and adjacent parts to substantially the same particle orientation shifting movement as that to which the powdered metal of the remaining portion of the article is subjected.

Another object of the invention is the provision of a briquetting apparatus and method of this kind which produces powdered metal briquettes of varying cross section that are substantially uniform in density throughout and which, when sintered, have uniform structural strength.

A further object of the invention is the provision of means for ejecting tapered briquettes of this kind from the dies in which they are formed by engagement with the base ends of the latter in order to safeguard the tapered or pointed ends thereof from injury.

A still further object of the invention is to control the compression to which the powdered metal charge is subjected in the tapered end forming portions of the dies as to guard against sticking or binding of the tapered end portions in the dies and consequently breaking of the briquette during separation thereof from the dies.

An illustrative embodiment of the invention is shown in the accompanying drawing, in which:

Fig. 1 is a fragmentary vertical sectional view of die forming apparatus embodying the invention illustrating the parts thereof in position to commence a briquette forming operation.

Fig. 2 is a vertical sectional view of the apparatus shown in Fig. 1 illustrating the parts thereof in the final briquette compressing stage. I

Fig. 3 is a side elevational view, partly in section, of die forming apparatus embodying the invention and illustratin one form of mechanism by which the die parts may be operated.

The apparatus and method embodying the invention is adapted for use in forming articles of diverse shapes and may be employed to advantage in the forming of powdered metal briquettes which have a body portion of cylindrical or other uniform cross section and a tapered or conical end portion. For the purpose of illustrating the invention, there is shown in the drawing, the application of the apparatus and method to the 7 Claims. (Cl. 78--0.5)

forming of projectiles of the type which have a cylindrical body portion and a tapered ogive. Projectile briquettes formed in accordance with the invention may be sintered in a non-oxidizing or reducing atmosphere and brought to final desired dimensions and contour in a suitable sizing operation such as that illustrated in United States Patent No. 2,226,002 issued to A. J. Langhammer on December 24, 1940. The powdered metal charge may comprise particles of a single powdered metal or a mixture of metal particles such as tin and copper.

In operating upon particles of powdered metal to bring them to compact briquette form, it is desirable to have the particles of metal at all positions in the charge undergo substantially the same amount of movement relative to the die structure or an amount of movement relative thereto of substantially the same order. This movement of the particles relative to the die parts during compression of a charge produces a particle orientation which facilitates compression into a dense structure. If, for example, one portion of a charge is held at rest while compression is applied at one extremity of the charge, the particles of metal at the extremity of the charge upon which compression was applied shift relative to the die substantially more than the particles of metal at the extremity of the charge which was held at rest and as a result, the particles of metal which moved relative to the die underwent orientation which the particles of metal which were held at rest were not subjected to. It is found that the parts of the compressed product comprising particles which were permitted to orient themselves during compression have a substantially greater density than the portion of the resulting briquette comprising particles which were held at rest.

With the improved briquette forming apparatus and method, all the particles of the charge are shifted relative to the die during the compressing operation sufliciently uniformly to produce a. briquette of substantially uniform density throughout. This is accomplished even in the formation of briquettes having body portions of substantially uniform cross section and tapered ends.

The apparatus comprises a support l0 having a bore II and a coaxial counterbore I2 of larger diameter than the bore ll. Slidably mounted in the bore II is a tubular die part l3 which has a radially extending flange I4 adapted to seat against a shoulder l5 disposed between th bore II and the counterbore I2. The tubular die part I3 has a cylindrical passage I6 extending therethrough which is adapted to receive a charge I! of powdered metal. The tubular die I 3 is normally urged to its upper limiting position established by abutment of the flange l4 against the shoulder l5, as viewed in Fig. 1, by a coil spring the upper end portion of the bore l I.

. 3 l3 which bears against the flange i4 and a shoulder is provided on a sleeve 23 which is threaded in the lower end portion of the counterbore l2. The upper extremity 2| of the sleeve is adapted to abut the lower side of the flange l4 of the die part l3 to establish the lower limiting position of the tubular die part l3, as illustrated in Fig. 2. The sleeve 23 may be set in a selected position by tightening a set screw 22 threaded in an aperture formed in the neck portion 23 depending from the support t3. A plunger, generally designated by the numeral 24, is disposed below the support III in axial alignment with the passage I3 of the tubular die part l3. The ram 24 has a stem portion 25 which extends into the lower end portion of the passage l3 of thedie part l3 in relatively close fitting relationship with respect to the walls thereof. The stem 25 serves to establish the depth of charg of powdered metal which'is receivable in the upper end portion of passage, l3 in the die I3. This stem also serves, as hereinafter more clearly set forth, to eject the charge after compression thereof.

Disposed above the support ill in axial alignment with the bore I l thereof is a ram 23 having a die part 21 on its lower extremity provided with a tapered closed end cavity 23- The die part 21 is adapted to engage the upper extremity of the shiftable tubular die part i3 when the ram is -forced downwardly by -mechanism hereinafter has been filled with a charge of powdered metal or other powdered material, the ram 23 is forced downwardly to bring the die part 21 thereof into Durin this movement of the ram, the tubular die part I3 is forced downwardly against the action of the spring i3 and the stem 25 of the plunger 24 is held at rest so as to produce relative movement between all portions of the charge l1 and the walls of the passage l3 and to displace some of the particles powdered material at the upper end of the charge l1 from the passage l3 into cavity 23. Further downward movement of the ram 23 causes the powdered'charge to be compressed to a desired degree depending upon the extent to which the tubular die part I3 is urged downwardly "upward movement of the tubular die part 13 and after the latter has reached its upper limiting position, the stem 25 is thrust upwardly relatively to the tubular die part l3 in order to eject the finished briquette from the passage I 3.

The ram 23 and plunger 24 may be operated by any suitable coining press mechanism, an example of which is illustratedin Fig. 3. In this form of coining press construction, a cam memand 33 are so constructed and arranged as to prodownwardly while the plunger 24 remains at rest 5 during contact thereof with a constant radius portion of the cam38. After the ram 23 has completed its full compression stroke, the cam 33 withdraws it. At the same time, the cam 33 commences to urgethe plunger 24 upwardly.

During the operation of the foregoing briquette forming apparatus and method, substantially all portions of the particles of metal of the charge are subjected to orientation by movement with respect to the die part in which they are con- 5 tained. A tapered end is formed on thebriquette without a significant variation in density at the tapered and base end portions of the briquette.

Even-more important is thefact that the density.

the particles past the plane at which the ex-- tremity 29 of the die part 21 engages the upper extremity of the tubular die IS. The resulting briquette is ejected from the tubular die part i3 by pressing upon its base end portion rather than its tapered end portion in order to avoid the ap- 5 plieation of excessively high unit pressure on the relatively pointed extremity of the briquette.

Although but one specific embodiment of the invention is herein shown and described. it is to be understood that various changes in the size, 40 shape and arrangement of parts may be made without departing from the spirit of the inven-. tion.

' What is claimed is:

1. Apparatus for briquetting articles from powdered metal including a support, a tubular die part having a passage therethrough shiftably mounted on said support; means for yieldably urging said tubular die part upwardly, a ram provided with a die part having a surface directly engageable with said tubular die part for positively shifting the latter against the action of said means and having a closed end cavity registerable with the passage oflsaid tubular die part, a plunger member extending into the lower end portion of said tubulardie part normally predetermining the depth of charge of powdered metal receivable in the upper end portion of said passage and adapted to displace a portion of said charge from said passage into said closed end cavity during initial movement of said tubular die part relative to said plunger under the action of said ram and to compress said entire charge into a briquette during further movement of said ram. 7 2. Apparatus for briquetting articles from powdered metal including a support, a tubular die part having a passage therethrough shiftably mounted on said support, resilient means coacting between said support and said tubular die part and yieldably urging the latter upwardly,

a ram provided with a die part having a surface directly engageable with said tubular die part for positively shifting it against'the action of said means and having a closed end cavity registerable with the passage of the latter, a plungbriquette during further movement of said ram,

said plunger member being shiftable relative to said support and tubular die part after withdrawal of said ram for ejecting the resulting briquette from said tubular die part.

3. Apparatus for briquetting from powdered metal articles having a portion of uniform cross section and a portion varying in cross section at successive increments of its length including a support, a tubular die part having a passage therethrough comprising an upper section of uniform cross section, means for yieldingly urging said tubular die part outwardly with respect to said support, a ram provided with a die part having a surface directly engageable with said tubular die part for positively shifting the latter against the action of said means during the initial effective portion of the stroke of said ram and having a closed end cavity registerable with the passage of said tubular die part and varying incross section at successive increments of its,

said passage into said closed end cavity during,

initial movement of said tubular die part relative to said plunger under the action of said ram and to compress said entire charge into a briquette during further movement of said ram.

4. Apparatus for briquetting from powdered metal articles having a portion of uniform cross section and a portion of tapering shape including a support, a tubular die part having a passage therethrough comprising an upper section of uniform cross section, means for yieldingly urging said tubular. die part outwardly with respect to said support, a ram having a die partengageable with the outer extremity of said tubular die part for positively shifting said tubular die part against the action of said means and provided with a tapered closed end cavity registerable with the passage of the latter, a plunger member extending into the lower end portion of said tubular die part normally predetermining the depth of charge of powdered metal receivable in the upper end portion of said passage and adapted to displace a portion of said charge from said passage into said closed end cavity during initial movement of said tubular die part relative to said plunger under the action of said ram and to compress said entire charge into a briquette during further relative movement of said ram and plunger, said plunger member being shiftable relative to said tubular die part for ejecting said briquette by engagement with the end thereof opposite from its tapered extremity after compression of said charge.

5. Apparatus for briquetting articles from powdered metal including a support, a tubular of said tubular die part, means for yieldably urgagainst the action of said resilient means, said ram having a die part provided with an extremity for seating against the outer extremity of said tubular die part and having a closed end cavity registerable with the passage of the latter, a plunger member extending into the end portion of said tubular die part adjacent the opposite extremity thereof, said plunger having a close fitting relationship with respect to the walls of said passage and being adapted to predetermine the depth of charge of powdered metal receivable in the portion of said passage unoccupied by it, means for forcing said ram against said tubular die part in order to shift the latter relative to said plunger member in one direction so as to 'nitially displace a portion of said charge from said passage into said closed end cavity of the die part of said ram and to subsequently compress said charge to a predetermined density, and means for shifting said plunger in the opposite direction relative to die partfhaving a passage therethrough shift- 1 said tubular member for ejecting the resulting compressed charge therefrom.

6. Apparatus for forming from powdered metal a projectile shaped briquette having a cylindrical body portion and a tapered ogive including a support, a tubular die part axially shiftably mounted on said support having a passage for receiving a powdered metal charge and which is adapted to form the body portion of said briquette, a shiftable ram having a die part directly engageable with said tubular die part for positively shifting the latter independently of said powdered metal charge and provided with a tapered closed end cavity registerable with said passage for forming the ogive, mechanism for forcing said ram against said tubular die part to shift the latter axially, and means extending into the passage of said tubular die part for holding said charge against movement with the latter in order to initially displace a portion of said charge from said passage into said cavity and to thereafter compress said charge to a predetermined density during movement of said tubular die part by said ram.

7. Apparatus for forming from powdered metal a projectile shaped briquette having a cylindrical body portion and a tapered ogive including a support, a tubular die part axially shiftably mounted on said support having a passage for receiving a powdered metal charge and which is adapted to form the body portion of said briquette, a shiftable ram having a die part engageable with an closed end cavity registerable with said passage for forming the ogive, mechanism for forcing said ram against said tubular die part to shift the latter axially, a shiftable plunger extending into the end of said passage opposite from said ram for holding said charge against movement with the latter in order to initially displace a portion of said charge from said passage into said cavity and to thereafter compress said charge to a predeter- ANTHONY J. LANG

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2570989 *Feb 15, 1944Oct 9, 1951Gen Bronze CorpApparatus for forming powder metallurgy parts
US2694952 *Aug 29, 1950Nov 23, 1954General Motors CorporationManufacture of commutator bars
US2759257 *Nov 20, 1952Aug 21, 1956Werner SchlegelProcess for forging cast iron and the like
US2804790 *Jun 4, 1954Sep 3, 1957Lefere Forge & Machine CoMethod and apparatus for forging
US2805624 *Mar 11, 1952Sep 10, 1957Olin MathiesonMetallurgical process
US3200175 *Jun 17, 1960Aug 10, 1965Crown Machine & Tool CompanyMethod of making cups
US3233304 *Nov 14, 1963Feb 8, 1966Hettes Robert CBullet swaging device
US3491407 *Dec 18, 1967Jan 27, 1970IbmPress for ferrite cores
US3829940 *Jun 29, 1972Aug 20, 1974Oerlikon Buehrle AgShell with spherical-shaped projectiles, method for the fabrication thereof, and apparatus for the performance
US3989438 *Jul 28, 1972Nov 2, 1976Joseph Lucas (Industries) LimitedMethod for producing a hot pressed component
US4061452 *Jan 21, 1977Dec 6, 1977Wolverine Aluminum CorporationApparatus for producing spherical articles
US4104014 *Jul 13, 1977Aug 1, 1978Key IndustriesPunch for compressing machine
US4298563 *Jun 27, 1980Nov 3, 1981Ptx-Pentronix, Inc.Apparatus and method for compacting prismatic or pyramidal articles from powder material
US4330252 *Oct 30, 1980May 18, 1982Bullock Kenneth WFood packing machinery with differential force-controlled packing action
US4347051 *Sep 17, 1979Aug 31, 1982Ptx-Dentronix, Inc.Die and punch assembly for compacting powder material
US4693109 *Mar 4, 1986Sep 15, 1987Wickes Manufacturing CompanySelf-aligning tool assembly for die shaping workpieces
US5474726 *Apr 4, 1994Dec 12, 1995North American Refractories CompanyMethod of making interlocking checker bricks
US5722035 *Jun 13, 1995Feb 24, 1998Wilhelm Brenneke Gmbh & Co. KgMethod of producing hunting projectile with hollow point
US6761554Jun 25, 2001Jul 13, 2004Leraj, Inc.Rotary tableting press
US20020197347 *Jun 25, 2001Dec 26, 2002Patel Naresh C.Rotary tableting press
DE1080915B *Jul 2, 1958Apr 28, 1960Fek Fuer Bau Keramik Und HartzNachpressvorrichtung
Classifications
U.S. Classification425/78, 425/355, 72/359, 86/54, 425/422
International ClassificationB30B11/02, B30B11/04
Cooperative ClassificationB30B11/04
European ClassificationB30B11/04