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 numberUS3447593 A
Publication typeGrant
Publication dateJun 3, 1969
Filing dateMay 25, 1967
Priority dateMay 25, 1967
Publication numberUS 3447593 A, US 3447593A, US-A-3447593, US3447593 A, US3447593A
InventorsNyselius Gustav
Original AssigneeMt Vernon Die Casting Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Apparatus for die casting
US 3447593 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

June 3, 1969 G. NYSELIUS APPARATUS FOR DIE CASTING Filed May 25. 1967 United States Patent US. Cl. 164-312 8 Claims ABSTRACT OF THE DISCLOSURE The casting material is supplied from a furnace reservor upwardly through an inclined spout and through an upwardly and oppositely inclined charging sleeve to the lower end of a runner defined between a plurality of pairs of opposed plates, the lower ends of the lower pair of plates meeting the upper end of the charging sleeve at an inclined interface. Means are provided for maintaining the temperature of the sleeve and the pairs of runner defining plates as well as the die plates at different temperatures and the charging sleeve may be made of steel because it is automatically emptied of casting material between casting operations.

This invention relates to die casting apparatus in which casting material in excess of the amount required to fill the die cavity is returned by gravity to a supply reservoir.

An object of the invention is to provide apparatus employing a steel charging sleeve in which the sleeve is automatically emptied of casting material between casting operations.

Another object of the invention is to angularly relate a charging spout to a charging sleeve, and the sleeve to a pair of vertically extending die plates, so that a charge of material to be cast is supplied upwardly from the sleeve into a die cavity defined between the die plates.

Another object of the invention is to provide runner defining means communicating between a vertically extending gate and die cavity and an upwardly inclined charging sleeve.

In carrying out the invention I provide a furnace reservoir 10 in which material to be cast is heated and maintained in molten state. An upwardly inclined charging spout 12 supplies successive charges of material to be cast from the furnace reservoir into an upwardly inclined steel charging sleeve 14 the upper end of which communicates with a runner 16 defined between the plates 18 and 20. The upper end of sleeve 14 and the lower end of plates 18 and 20 are inclined and meet at the inclined interface 22. Between the upper ends of plates 18 and 20 and the die plates 32 and 34 one or more additional pairs of runner defining plates are employed. In the drawings two additional pairs of plates 24 and 26, and 28 and 30 are employed defining runner portions 16a and 16b, the latter communicating directly with a gate 36 opening into a die cavity 38 both of which are defined between the die plates 32 and 34.

The die plates 32 and 34, the plates 18 and 20, and the plates 24, 26 and 28, 30, are detachably supported by platens 40 and 42, platen 42 being movable, by known means, toward and away from plate 40 to open and close the die plates and the runner defining plates.

Any suitable means may be employed for intermittently forcing charges of casting material from reservoir 10 through spout 12 into the sleeve 14. As shown herein, the furnace reservoir is closed except for spout 12 and an inlet port 44 through which fluid under pressure may be introduced into the furnace-reservoir at a predetermined pressure and for a predetermined period of time. Conduit 46 is shown for connecting port 44 to a source 3,447,593 Patented June 3, 1969 of fluid under pressure (not shown) with valve control means which may be of known kind indicated generally by the numeral 48.

Within sleeve 14 a reciprocable piston 50 is provided, movable between a position below port 52, in the side wall of the sleeve with which spout 12 communicates, and a position above port 52 and adjacent the juncture between the upper end of the chamber defined by the sleeve and the lower end of the runner 16. The piston may be reciprocated by known means in timed relation to the delivery from the furnace-reservoir to the sleeve 14 of charges of material to be cast.

Electric coils 54, 56 and 58 are shown in sleeve 12 and in the plates 18 and 20 respectively, for maintaining a charge of casting material molten while it is being lifted toward the die cavity and while the excess is returning to the reservoir from the runner and the sleeve.

The pairs of plates 24, 26, and 28, 30 are shown provided with channels 60, 62 and 64, 66 respectively through which fluid may be run to control the temperature of said pairs of plates.

The die plates 32 and 34 must be maintained at a temperature below, and preferably well below, the melting point of the material being cast, and the die plates are shown provided with channels 68, 70 through which fluid may be run to control the temperature of the die plates so that the temperature within the die cavity 38 will be below the melting point of the material being cast.

The apparatus disclosed herein may be used for easting aluminium, in spite of its steel charging sleeve 14, because the molten aluminium does not stand in the sleeve between charging cycles. Whatever the material being cast, its temperature will be maintained above its melting point while travelling within sleeve 12 and the portion of the runner defined by plates 18 and 20. The temperature of plates 24, 26 and 28, 30 are reduced below the temperature of the plates 18, 20 to reduce the heating of the die plates by conduction from plates 18, 20.

'In the casting of zinc, for example, the temperature within furnace-reservoir 10 may be maintained at approxi mately 1200 F. The hardened steel sleeve 14 and the plates I18 and 20 may be maintained at a temperature within the range 900 F.-1000 F. The pairs of plates 24, 26 and 28, 30 may be maintained at temperatures within the range 600 F.700 F. And the die plates 32, 24 may be maintained at a temperature within the range 400 F 500 F4 The apparatus described herein has the advantage that it may be employed for casting metals of widely different melting points. It supplies the charges of material to be cast to a die cavity gate aligned with the parting line of the die plates, and eliminates the goose neck charging sleeves and the gates extending through die plates at right angles to the parting line, customarily employed in the casting of zinc and other low melting point metals. It may be employed, with its steel charging sleeve, even for casting high melting point metals, because of its gravity return of the excess of each charge of material between successive casting cycles.

There has thus been provided, apparatus in which the above mentioned objects are attained in a thoroughly practical way.

What I claim is:

1. Die casting apparatus comprising, a pair of die plates defining between them a die cavity, a second pair of plates interposed between the sleeve and the die plates respectively, and defining between them a runner communicating between the sleeve and the die cavity, support means for the plates including movable means to close and open the pairs of plates respectively, an upwardly extending charging sleeve having a port in its side wall,

a charging piston reciprocal within the sleeve from a position below the port to a position above the port, means for heating the sleeve and the runner defining plates to keep casting material molten while it is Within the sleeve and runner, a reservoir of molten casting material to be cast, a spout extending upwardly from the reservoir to said port, and means for intermittently forcing a charge of material from the reservoir into the charging sleeve while the piston is below the sleeve port.

2. The die casting apparatus claimed in claim 1 in which means are provided for heating the sleeve and the second pair of plates forming the runner with which the sleeve communicates.

3. The die casting apparatus claimed in claim 1 in which at least one additional, or third, pair of plates is interposed between the die plates and the said second pair of plates, said third pair of plates defining between them a runner portion communicating between the runner portion defined by the second pair of plates and the die cavity, and means for providing a temperature difi'erential between the second and the third pairs of plates.

4. The die casting apparatus claimed in claim 1 in which the sleeve is inclined relative to the parting line between the die plates, and the upper end of the sleeve and the lower ends of the second pair of plates are inclined and meet at an interface which is angularly disposed relative to a horizontal plane.

5. The apparatus claimed in claim 1 in which the sleeve communicates with the runner portion defined by the second pair of plates, the sleeve being angularly disposed relative to the parting line of the second pair of plates, and the lower ends of second pair of plates being inclined providing an inclined interface between the lower ends of said second pair of plates and the upper end of the sleeve.

6. The apparatus claimed in claim 1 including means 4 for heating the second pair of plates and the sleeve to a temperature of from 900 F. to 1=0O0 F.

7. The aparatus claimed in claim 1 including a third pair of plates interposed between the die plates and the second pair of plates, and means for cooling the third pair of plates to a temperature intermediate the temperatures of the die plates and the second pair of plates.

8. Die casting apparatus comprising, a reservoir of molten material to be cast, said reservoir being closed except for a spout, and an inlet port through which fluid under a predetermined pressure may be introduced into the reservoir for a predetermined period of time, a pair of die plates defining bet-ween them a. die cavity, second and third pairs of plates defining different portions of a runner leading to the die cavity, a charging sleeve extending upwardly and disposed for communication bet-ween the reservoir spout and the runner and having a port extending through its side wall, the said spout extending upwardly from the reservoir to said port, and a plunger reciprocal within the sleeve between a retracted position below the said port to an extended position above said port, and means for controlling the temperatures of the pairs of plates to maintain a temperature differential between them.

References Cited UNITED STATES PATENTS 8/1965 Nyselius 1643l2 6/1966 Morton 164312 U.S. Cl. X.R. 164-306

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3201836 *Sep 21, 1964Aug 24, 1965Mount Vernon Die Casting CorpMethod of, and apparatus for, die casting metals
US3254377 *Apr 22, 1963Jun 7, 1966Morton Glenn RFluid cooled, lubricated and sealed piston means for casting devices
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3528478 *Jul 25, 1968Sep 15, 1970Nat Lead CoMethod of die casting high melting point alloys
US3672440 *Jun 13, 1969Jun 27, 1972Toshiba Machine Co LtdApparatus for die casting ferrous metals
US4154285 *Nov 11, 1977May 15, 1979Koujiro YamasakiGas release method in a metal mold
US4593741 *Apr 10, 1984Jun 10, 1986Caugherty William CDie casting apparatus
US4595044 *Apr 10, 1984Jun 17, 1986Vsi CorporationDie casting apparatus
US5983976 *Sep 25, 1998Nov 16, 1999Takata CorporationMethod and apparatus for manufacturing metallic parts by fine die casting
US6065526 *Aug 25, 1998May 23, 2000Takata CorporationMethod and apparatus for manufacturing light metal alloy
US6098700 *Feb 1, 1999Aug 8, 2000Alyn CorporationApparatus for die casting of metal matrix composite materials from a self-supporting billet
US6135196 *Sep 25, 1998Oct 24, 2000Takata CorporationMethod and apparatus for manufacturing metallic parts by injection molding from the semi-solid state
US6241001Jun 11, 1999Jun 5, 2001Takata CorporationMethod and apparatus for manufacturing light metal alloy
US6276434Jun 11, 1999Aug 21, 2001Takata CorporationMethod and apparatus for manufacturing metallic parts by ink injection molding from the semi-solid state
US6283197Jun 11, 1999Sep 4, 2001Takata CorporationMethod and apparatus for manufacturing metallic parts by fine die casting
US6474399Sep 12, 2001Nov 5, 2002Takata CorporationInjection molding method and apparatus with reduced piston leakage
US6540006Apr 26, 2001Apr 1, 2003Takata CorporationMethod and apparatus for manufacturing metallic parts by fine die casting
US6655445Nov 4, 2002Dec 2, 2003Takata CorporationInjection molding method and apparatus with reduced piston leakage
US6666258Jun 30, 2000Dec 23, 2003Takata CorporationMethod and apparatus for supplying melted material for injection molding
US6739379Apr 26, 2001May 25, 2004Takata CorporationMethod and apparatus for manufacturing light metal alloy
US6742570May 1, 2002Jun 1, 2004Takata CorporationInjection molding method and apparatus with base mounted feeder
US6789603Feb 2, 2004Sep 14, 2004Takata CorporationInjection molding method and apparatus with base mounted feeder
US6880614May 19, 2003Apr 19, 2005Takata CorporationVertical injection machine using three chambers
US6942006Oct 14, 2003Sep 13, 2005Takata CorporationInjection molding method and apparatus with reduced piston leakage
US6945310May 19, 2003Sep 20, 2005Takata CorporationMethod and apparatus for manufacturing metallic parts by die casting
US6951238May 19, 2003Oct 4, 2005Takata CorporationVertical injection machine using gravity feed
US7150308Sep 1, 2004Dec 19, 2006Takata CorporationMethod and apparatus for manufacturing metallic parts by die casting
US7296611Dec 1, 2006Nov 20, 2007Advanced Technologies, Inc.Method and apparatus for manufacturing metallic parts by die casting
US20040074626 *Oct 14, 2003Apr 22, 2004Takata CorporationInjection molding method and apparatus with reduced piston leakage
US20040231819 *May 19, 2003Nov 25, 2004Takata CorporationVertical injection machine using gravity feed
US20040231820 *May 19, 2003Nov 25, 2004Takata CorporationMethod and apparatus for manufacturing metallic parts by die casting
US20040231821 *May 19, 2003Nov 25, 2004Takata CorporationVertical injection machine using three chambers
US20050022958 *Sep 1, 2004Feb 3, 2005Takata CorporationMethod and apparatus for manufacturing metallic parts by die casting
US20050087320 *Nov 1, 2004Apr 28, 2005Takata CorporationFine die cast metallic parts
US20120273530 *Nov 24, 2010Nov 1, 2012Oskar Frech Gmbh + Co. KgCasting Unit for a Diecasting Machine
EP0285688A1 *Apr 7, 1987Oct 12, 1988Maschinenfabrik Müller-Weingarten AGHeating for the suction tube of a vacuum die-casting machine
EP1214997A1 *Dec 7, 2001Jun 19, 2002Ortmann Druckgiesstechnik GmbHCasting chamber for pressure die-casting metals
Classifications
U.S. Classification164/312, 164/306
International ClassificationB22D17/20, B22D17/08
Cooperative ClassificationB22D17/08, B22D17/2038
European ClassificationB22D17/08, B22D17/20D4