US2817884A - Nozzle and seat structure - Google Patents

Nozzle and seat structure Download PDF

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US2817884A
US2817884A US2817884DA US2817884A US 2817884 A US2817884 A US 2817884A US 2817884D A US2817884D A US 2817884DA US 2817884 A US2817884 A US 2817884A
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supply tube
seat
intake port
annular surface
inch
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/26—Mechanisms or devices for locking or opening dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/2023—Nozzles or shot sleeves

Definitions

  • Figure .2. is;a transverse.-sectional.view .of. theapparatus, taken. along-thesline .22'.on- Figure 1 Figure: :3: ism-an enlarged .view partlyin section, of 1 a2 portion-of. the apparatus.
  • 2,817,884 Patented Dec. 31, .1957- casting material which may be, for example,v of the:1ight-' weight nonferrous type; such as aluminumymagnesiunr or zinc, is introduced into the die caviti'esby an. injectioncylinder or cold chamber 24.
  • the cold chamber-24cm securedto platen 101 and projects through it; and. through the fixed die part 12;.having' its outer endi communicating with the die cavities;
  • Thebold chamber- is, in theform of an elongated tube which is formed withza plurality of elongated-passages 26-?having tubesZSveX-tending into the-.passages' whichrare connected to coolant-pipes 30;
  • a rodr38 has one end con nected towtheplunger- 36' andstheother end may be attached to: any zsuitablet mechanism (not-shown) for reciprocating the plunger-36*within' the cold chamber.
  • The: cold: chamber hasan" intake opening or port 40 through its bottomwallwhich is spaced inwardly from the. discharge .or-outer end 42.
  • Afrusto-conical seat 43 extendsdownwardly-from port 40; Theseat forms an angle of- 45 to the axis of thecone' which extends at right angles to'the axis of the cold chamber.
  • Therplept 36 is reciproeable between aninner" position illustrated inc Figures 1 and 3 at theinner side of the intake opening and ana outer position located outwardlyxbeyond' the. in-' take opening.
  • a container or reservoir '4'4 is locatedbeneath theintake opening'and-is adapted" to com-- tain a supply of molten castingszmat'eriala46i'
  • a vertical supply tube'or nozzle--48 is "provided for delivering: molten casting material from the: reservoir into the intake. openinga-40ofthe coldzchamber.
  • Theisupply tube is formed of tungsten carbide with a cobalt binder; Alternativelythe supply tube may be formed-ofa ceramic material; the principal constituent of which is carborundunr (silicon carbide); with; a-suitable binder such" as' silicon nitride.
  • the supply tube includesia: tubular. cylindrical portion 50; thelower end portion: of which extends be neath the top surfaceof casting material in the reservoir.”
  • The: cylindrical portion ofthesupply tube has-a "portion- 52 adjacent theupper end thereof reduced in diameter for attachment to a supportingmember 54-.
  • Theupper-ends of. the vertical rods are'reduced toextend th'roughopenings formed in the cross bar 625;:
  • the upper'extremiti'es of the reduced portions of'rods-60 are threaded-and abutments 64 are secured to the-upper extremities of the rod's;
  • the cross bar 62 is slidable on the reduced portions and the purpose of the springs is to cushion engagement of the supply tube with the seat surrounding the intake port to the cold chamber upon upward movement of the cross bar.
  • the cross bar 62 is connected to a hydraulic motor 68 comprising a vertically extending cylinder 70 having a piston (not shown) connected by a rod 72 to the cross bar.
  • Cylinder 70 is mounted on bracket 73 carried by support 10.
  • a bearing block 74 is formed with a vertically elongated longitudinally extending opening 76 for receiving the cold chamber 24.
  • the lower end of the opening is shaped to provide an extended bearing contact with the adjacent outer surfaces of the cold chamber and the latter surfaces are maintained in contact with the block by set screws 78 threadedly supported in the block in positions to extend into the opening 76 and engage the cold chamber 24.
  • the bottom of the block 74 is slotted to provide a clearance opening 80 directly opposite the intake port 40 to the cold chamber.
  • the vertical rods 60 are respectively slidably received in vertical grooves 82 formed in the bearing block at opposite sides thereof.
  • the supply tube is of one-piece construction and has an integral nozzle portion 84 at the upper end.
  • the upper end of the nozzle portion terminates in a flat annular surface 86 which extends at right angles to the longitudinal axis of the supply tube.
  • the laterally outer surface 88 of the nozzle portion 84 is frusto-conical, its axis coinciding with the supply tube axis, and forms. an angle of 15 with the longitudinal axis of the supply tube.
  • the laterally outer surface 88 and the end surface 86 are connected by an annular surface 90 which is of convex arcuate cross section in planes through and including the longitudinal axis of the supply tube.
  • the radius of curvature of the annular surface should be between one sixty-fourth of an inch ,4; and three-sixteenths of an inch i In the present instance, such radius is one-eighth of an inch 43").
  • the axis of the supply tube and of the surface 88 coincides with that of the seat 43.
  • the convex annular surface 90 is adapted to sealingly engage with the conical seat 43 continuously throughout the full 360 thereof when the supply tube is raised to the position shown in Figure 2. It is highly desirable for such a sealing engagement to result in order to prevent casting material from leaking at the intake opening and also to maintain a vacuum within the cold chamber where the charge of molten casting material is introduced thereinto by vacuum.
  • the supply tube is held against the seat 43 of the cold chamber under a substantial pressure and therefore the annular surface 90 is rounded or convex for engagement with the frusto-conical seat.
  • the radius of curvature should not be greater than of an inch in order to prevent the excessive transfer of heat from the supply tube to the relatively cool cold chamber. If a larger radius is employed, too great an area of surface-tosurface contact will result and the supply tube will be cooled excessively. If the supply tube is cooled excessively there is a tendency for the molten casting material to solidify therewithin and plug it.
  • the radius of curvature of the surface 90 is too small, it will tend to coin or wear away the conical seat. Either of the materials specified for the supply tube is harder than the steel seat so that the supply tube nozzle will not wear. To prevent wear of the seat, it has been found that the radius of curvature of surface 90 should not be less than ,6 of an inch. If the seat 43 is coined by the nozzle portion of the supply tube, then the area of surface-to surface contact would increase and likely cool the supply tube excessively. Then, too, if the seat 43 is coined, the seal between the nozzle and seat would no doubt be broken or at least reduced in effectiveness.
  • the ideal radius of curvature, all of the above factors considered, is A; of an inch.
  • the manner in which the molten casting material is moved through the supply tube into the cold chamber may vary and forms no part of this invention and hence is not shown.
  • the casting material may be forcibly pumped through the supply tube.
  • vacuum producing equipment may be connected with the cold chamber to, in effect, suck the casting material into the cold chamber when the piston is retracted to the position illustrated.
  • the piston is thereafter moved outwardly beyond the intake port to force the casting material into the die cavities.
  • die casting apparatus including a die cavity and means providing a passage leading to said die cavity for introducing a charge of molten casting material thereinto, an intake port to said passage, a supply tube for delivering molten casting material to said passage throu h said intake port, an annular seating surface surrounding said intake port, said supply tube including a nozzle portion at the discharge end thereof having an annular surface sealingly engageable with said seating surface continuously throughout the full 360 thereof, one of said surfaces being frusto-conical and the other being of convex arcuate cross-section in planes through and including the axis thereof, the radius of curvature of said convex surface being within the range of of an inch to of an inch.
  • die casting apparatus including a die cavity and means providing a passage leading to said die cavity for introducing a charge of molten casting material thereinto, an intake port to said passage, a supply tube for delivering molten casting material to said passage through said intake port, a frust0-conical seat surrounding said intake port, said supply tube including a nozzle portion at the discharge end thereof having an annular surface sealingly engageable with said frusto-conical seat continuously throughout the full360 thereof, said annular surface being of convex arcuate cross-section in planes through and including the axis thereof, the radius of curvature of said annular surface being within the range of th of an inch to of an inch, said supply tube being movable toward and away from said intake port to relatively move said surface into and out of sealing engagement with said seat.
  • die casting apparatus including a die cavity and means providing a passage leading to said die cavity for introducing a charge of molten casting material thereinto, an intake port to said passage, a supply tube for delivering molten casting material to said passage through said intake port, a frusto-conical seat surrounding said intake port, said supply tube including a nozzle portion at the discharge end thereof having an annular surface sealingly engageable with said frusto-conical seat continuously throughout the full 360 thereof, said annular surface being of convex arcuate cross-section in planes through and including the axis thereof, the radius of curvature of said annular surface being within the range of ,4 of an inch to 7 of an inch, said supply tube being movable toward and away from said intake port to relatively move said surface into and out of sealing engagement with said seat, said supply tube being formed of tungsten carbide with a cobalt binder and said seat being formed of air-hardened steel.
  • the radius of curvature of said annular surface is of an 1116 8.
  • die casting apparatus including a die cavity and means providing a passage leading to said die cavity for introducing a charge of molten casting material thereinto, an intake port to said passage, a supply tube for delivering molten casting material to said passage through said intake port, a frusto-conical seat surrounding said intake port, said supply tube including a nozzle portion at the discharge end thereof having an annular surface sealingly engageable with said frusto-conical seat continuously throughout the full 360 thereof, said annular surface being of convex arcuate cross-section in planes through and including the axis thereof, the radius of curvature of said annular surface being within the range of of an inch to A of an inch, said supply tube being movable toward and away from said intake port to relatively move said surface into and out of sealing engagement with said seat, said supply tube being formed of a ceramic material including silicon carbide, and said seat being formed of air-hardened steel.
  • die casting apparatus including a die cavity and means providing a passage for molten casting material to be introduced into said die cavity, an intake port to said passage, a supply tube for delivering molten casting material to said passage through said intake port, an annular seating surface surrounding said intake port, said supply tube including a nozzle portion at the discharge end thereof having an annular surface sealingly engageable with said seating surface continuously throughout the full 360' thereof, one of said surfaces being of convex arcuate cross section in planes through and including the axis thereof, the radius of curvature of said convex surface being within the range of ,4, of an inch to A of an inch.
  • die casting apparatus including a die cavity and means providing a passage leading to said die cavity for introducing a charge of molten casting material thereinto, an intake port to said passage, a supply tube for delivering molten casting material to said passage through said intake port, an annular seat surrounding said intake port, said supply tube including a nozzle portion at the discharge end thereof having an annular surface sealingly engageable with said seat continuously throughout the full 360 thereof, said annular surface being of convex arcuate cross-section in planes through and including the axis thereof, the radius of curvature of said annular surface being within the range of of an inch to of an inch.
  • die casting apparatus including a die cavity and means providing a passage leading to said die cavity for introducing a charge of molten casting material thereinto, an intake port to said passage, a supply tube for delivering molten casting material to said passage through said intake port, a frusto-conical seat surrounding said intake port, said supply tube including a nozzle portion at the discharge end thereof having an annular surface sealingly engageable with said frusto-conical seat continuously throughout the full 360 thereof, said annular surface being of convex arcuate cross-section in planes through and including the axis thereof, the radius of curvature of said annular surface being within the range of ,4, of an inch to A of an inch, said annular surface being harder than said seat.

Description

Dc. 31, 1957 RING 2,817,884
NOZZLE AND SEAT STRUCTURE Filed Jan. 23, 1956 9 v 1 IINVENTORQ Li" 0 i LucIAN RING L-JL BY v
[:51] 7 ATTORNEYS United States Patent NOZZLE AND SEAT STRUCTURE Lucian Ring, Birmingham, Mich, assignor to Ring Aluminum'Development'Companyg .a corporation of Michigam- Application January 23, 1956, SeriaLNo.v 560,793 r 17 Claims; (Cl-.'22 '68) invention; t relates to: die casting machines and refers .more particularly to a. nozzle and: seat- 1 structure fordie-casting-machines Die.casting-machinesof the present type comprise: a-
die -ficavity and -a. cylindenleading-z to the-die cavity for It is desirable that the annular discharge end-ofithe nozzle :01; supply tube engages :the: annular seat surrounding thedntalre. portcontinuously. throughout the full.- 360 thereof :torpreventthe. escape of casting. materialt and; w-hereethe: casting material is drawn into" the. cylinder by-vacut1m,.;totprovider a, seal; However, becauseaof; the. engagementtofithe=supply ttubewith: the intake, port of the cylinder there is. the. dangen that excessivenheat twill: bewithdrawn from the supplv tube' andas; a result. the' molten castinggmateriah may; tend: tossolidifiy in the? supply tube. andtplugiti; I
Witlr the.- foregoing1in= view, it is .amobject of? this, in:-' vention to.- provideta/nozzle and: seati structureiwhicha will permit. :ofiia tight. sealing engagement,; yet. which t will knot result. :in. excessive i. heat. transfenfrom. the a supply. tube tothe cylinden Another: objectnof. the I invention! is :to, provide i-a-rnoz-zle and seat structure which will also reduce to a minimunr on substantially-3 eliminate.-. wean betwcen .the engaging surfacestof thenoz zleaand seatp Other objects of the inventionwill'become. apparent asathe following description; proceeds, especially" when considered: zinrconnection. with the accompanying drawing, wherein Figured is; a-ssemi-diagr-ammatic-side .elevationalview of: apparatus embodyinggthe inventionz.
Figure .2. is;a transverse.-sectional.view .of. theapparatus, taken. along-thesline .22'.on-Figure 1 Figure: :3: ism-an enlarged .view partlyin section, of 1 a2 portion-of. the apparatus.
2,817,884 Patented Dec. 31, .1957- casting material which may be, for example,v of the:1ight-' weight nonferrous type; such as aluminumymagnesiunr or zinc, is introduced into the die caviti'esby an. injectioncylinder or cold chamber 24. The cold chamber-24cm securedto platen 101 and projects through it; and. through the fixed die part 12;.having' its outer endi communicating with the die cavities;
Thebold chamber-is, in theform of an elongated tube which is formed withza plurality of elongated-passages 26-?having tubesZSveX-tending into the-.passages' whichrare connected to coolant-pipes 30; The passages -26: extend from the inner end332mofthe cold chamber to acp'oint adjacent the outenend Band the tubes terminate: short of the outer ends 'of-T the passages and are of substantially less. diameter than "the "passages to' provide a return for thecoolin'g medium: introduced into thetubes 28 by the pipes. =30." Tfh'e coolant is withdrawn 'from' the return .byi discharge-pipeswfls. By this means; the cold chamber 26 is-maintained=fatra uniform relatively cool' temperature;
A plunger: 364s.- supported forr sliding movement within the tubular coldchamber A rodr38 has one end con nected towtheplunger- 36' andstheother end may be attached to: any zsuitablet mechanism (not-shown) for reciprocating the plunger-36*within' the cold chamber.
The: cold: chamberhasan" intake opening or port 40 through its bottomwallwhich is spaced inwardly from the. discharge .or-outer end 42. Afrusto-conical seat 43 extendsdownwardly-from port 40; Theseat forms an angle of- 45 to the axis of thecone' which extends at right angles to'the axis of the cold chamber. Seat"43 and. in fact the entirercold chamber 24 is formed? of air-'- hardened' steel;- Molten castingmateria'l forced into the diecavities by;plunger; 36 is initially introduced intothe. cold: chamber through the intake opening: Therplungen 36"is reciproeable between aninner" position illustrated incFigures 1 and 3 at theinner side of the intake opening and ana outer position located outwardlyxbeyond' the. in-' take opening.
As seenin 'Figure 1; a container or reservoir '4'4 is locatedbeneath theintake opening'and-is adapted" to com-- tain a supply of molten castingszmat'eriala46i' The-con Figure:4isan enlargedafr-ag-mentanydetaiL of a portion-of Figure};
1 Eignreriis a fragmentary-detail view.
Referring nowr more particularly to the -drawing the machinecomprises. astationary supportnor platen 10;
having-,a stationary die -pant 1-2-.'secured.'thereto'.- A-mow tamer-may be heated :by any suitable means to: maintain-v the-casting material in-aa'molten condition:
A vertical supply tube'or nozzle--48 is "provided for delivering: molten casting material from the: reservoir into the intake. openinga-40ofthe coldzchamber. Theisupply tube is formed of tungsten carbide with a cobalt binder; Alternativelythe supply tube may be formed-ofa ceramic material; the principal constituent of which is carborundunr (silicon carbide); with; a-suitable binder such" as' silicon nitride. The supply tube includesia: tubular. cylindrical portion 50; thelower end portion: of which extends be neath the top surfaceof casting material in the reservoir." The: cylindrical portion ofthesupply tube has-a "portion- 52 adjacent theupper end thereof reduced in diameter for attachment to a supportingmember 54-. As shown: in: Figure 5 the opposite sides 5630f the reduced portion 52Zare flattened to enable insertion of the reduced; portiom into a narrow slot 58 formed insthe supporting member 54-andropening through one edge-thereof; The slot. 58 terminates in an enlarged portion which enablesrotating the tube- 48 m lock the same in' assembled relationshipwith the supporting? member 54.
Thesupporting member 54 is connected by vertical rods 60 to-a crossbar-62 positioned above the cold cham-= her- 24. Theupper-ends of. the vertical rods are'reduced toextend th'roughopenings formed in the cross bar 625;: The upper'extremiti'es of the reduced portions of'rods-60 are threaded-and abutments 64 are secured to the-upper extremities of the rod's; Coil springs 66-= are mounted on: the reduced portions of the 'rods*- between the abutments and the cross bar. The cross bar 62 is slidable on the reduced portions and the purpose of the springs is to cushion engagement of the supply tube with the seat surrounding the intake port to the cold chamber upon upward movement of the cross bar.
The cross bar 62 is connected to a hydraulic motor 68 comprising a vertically extending cylinder 70 having a piston (not shown) connected by a rod 72 to the cross bar. Cylinder 70 is mounted on bracket 73 carried by support 10. Thus, vertical movement of the piston in cylinder 70 imparts a corresponding movement to the cross bar to move the supply tube vertically along its axis.
A bearing block 74 is formed with a vertically elongated longitudinally extending opening 76 for receiving the cold chamber 24. The lower end of the opening is shaped to provide an extended bearing contact with the adjacent outer surfaces of the cold chamber and the latter surfaces are maintained in contact with the block by set screws 78 threadedly supported in the block in positions to extend into the opening 76 and engage the cold chamber 24. The bottom of the block 74 is slotted to provide a clearance opening 80 directly opposite the intake port 40 to the cold chamber. The vertical rods 60 are respectively slidably received in vertical grooves 82 formed in the bearing block at opposite sides thereof.
The supply tube is of one-piece construction and has an integral nozzle portion 84 at the upper end. The upper end of the nozzle portion terminates in a flat annular surface 86 which extends at right angles to the longitudinal axis of the supply tube. The laterally outer surface 88 of the nozzle portion 84 is frusto-conical, its axis coinciding with the supply tube axis, and forms. an angle of 15 with the longitudinal axis of the supply tube. The laterally outer surface 88 and the end surface 86 are connected by an annular surface 90 which is of convex arcuate cross section in planes through and including the longitudinal axis of the supply tube. The radius of curvature of the annular surface should be between one sixty-fourth of an inch ,4; and three-sixteenths of an inch i In the present instance, such radius is one-eighth of an inch 43"). The axis of the supply tube and of the surface 88 coincides with that of the seat 43.
The convex annular surface 90 is adapted to sealingly engage with the conical seat 43 continuously throughout the full 360 thereof when the supply tube is raised to the position shown in Figure 2. It is highly desirable for such a sealing engagement to result in order to prevent casting material from leaking at the intake opening and also to maintain a vacuum within the cold chamber where the charge of molten casting material is introduced thereinto by vacuum.
The supply tube is held against the seat 43 of the cold chamber under a substantial pressure and therefore the annular surface 90 is rounded or convex for engagement with the frusto-conical seat. However, the radius of curvature should not be greater than of an inch in order to prevent the excessive transfer of heat from the supply tube to the relatively cool cold chamber. If a larger radius is employed, too great an area of surface-tosurface contact will result and the supply tube will be cooled excessively. If the supply tube is cooled excessively there is a tendency for the molten casting material to solidify therewithin and plug it.
If the radius of curvature of the surface 90 is too small, it will tend to coin or wear away the conical seat. Either of the materials specified for the supply tube is harder than the steel seat so that the supply tube nozzle will not wear. To prevent wear of the seat, it has been found that the radius of curvature of surface 90 should not be less than ,6 of an inch. If the seat 43 is coined by the nozzle portion of the supply tube, then the area of surface-to surface contact would increase and likely cool the supply tube excessively. Then, too, if the seat 43 is coined, the seal between the nozzle and seat would no doubt be broken or at least reduced in effectiveness. The ideal radius of curvature, all of the above factors considered, is A; of an inch.
The manner in which the molten casting material is moved through the supply tube into the cold chamber may vary and forms no part of this invention and hence is not shown. Thus, when the piston is retracted to the Figure 3 position, the casting material may be forcibly pumped through the supply tube. On the other hand, vacuum producing equipment may be connected with the cold chamber to, in effect, suck the casting material into the cold chamber when the piston is retracted to the position illustrated. The piston is thereafter moved outwardly beyond the intake port to force the casting material into the die cavities.
What I claim as my invention is:
1. In die casting apparatus including a die cavity and means providing a passage leading to said die cavity for introducing a charge of molten casting material thereinto, an intake port to said passage, a supply tube for delivering molten casting material to said passage throu h said intake port, an annular seating surface surrounding said intake port, said supply tube including a nozzle portion at the discharge end thereof having an annular surface sealingly engageable with said seating surface continuously throughout the full 360 thereof, one of said surfaces being frusto-conical and the other being of convex arcuate cross-section in planes through and including the axis thereof, the radius of curvature of said convex surface being within the range of of an inch to of an inch.
2. In die casting apparatus including a die cavity and means providing a passage leading to said die cavity for introducing a charge of molten casting material thereinto, an intake port to said passage, a supply tube for delivering molten casting material to said passage through said intake port, a frust0-conical seat surrounding said intake port, said supply tube including a nozzle portion at the discharge end thereof having an annular surface sealingly engageable with said frusto-conical seat continuously throughout the full360 thereof, said annular surface being of convex arcuate cross-section in planes through and including the axis thereof, the radius of curvature of said annular surface being within the range of th of an inch to of an inch, said supply tube being movable toward and away from said intake port to relatively move said surface into and out of sealing engagement with said seat.
3. The apparatus defined in claim 2 in which said nozzle portion is formed of a material including tungsten carbide and said seat is formed of steel.
4. The apparatus defined in claim 2 in which said nozzle is formed of a ceramic material including silicon carbide, and said seat is formed of steel.
5. The apparatus defined in claim 2 in which the radius of curvature of said annular surface is ;{;th of an inch.
6. In die casting apparatus including a die cavity and means providing a passage leading to said die cavity for introducing a charge of molten casting material thereinto, an intake port to said passage, a supply tube for delivering molten casting material to said passage through said intake port, a frusto-conical seat surrounding said intake port, said supply tube including a nozzle portion at the discharge end thereof having an annular surface sealingly engageable with said frusto-conical seat continuously throughout the full 360 thereof, said annular surface being of convex arcuate cross-section in planes through and including the axis thereof, the radius of curvature of said annular surface being within the range of ,4 of an inch to 7 of an inch, said supply tube being movable toward and away from said intake port to relatively move said surface into and out of sealing engagement with said seat, said supply tube being formed of tungsten carbide with a cobalt binder and said seat being formed of air-hardened steel.
7. The apparatus defined in claim. 6 in which the radius of curvature of said annular surface is of an 1116 8. In die casting apparatus including a die cavity and means providing a passage leading to said die cavity for introducing a charge of molten casting material thereinto, an intake port to said passage, a supply tube for delivering molten casting material to said passage through said intake port, a frusto-conical seat surrounding said intake port, said supply tube including a nozzle portion at the discharge end thereof having an annular surface sealingly engageable with said frusto-conical seat continuously throughout the full 360 thereof, said annular surface being of convex arcuate cross-section in planes through and including the axis thereof, the radius of curvature of said annular surface being within the range of of an inch to A of an inch, said supply tube being movable toward and away from said intake port to relatively move said surface into and out of sealing engagement with said seat, said supply tube being formed of a ceramic material including silicon carbide, and said seat being formed of air-hardened steel.
9. The apparatus defined in claim 8 in which the radius of curvature of said annular surface is $4, of an inch.
10. The apparatus defined in claim 9 in which said frusto-conical seat tapers at an angle of 45 to its axis.
11. The apparatus as defined in claim 7 in which said frusto-conical seat tapers at an angle of 45 to its axis.
12. In die casting apparatus including a die cavity and means providing a passage for molten casting material to be introduced into said die cavity, an intake port to said passage, a supply tube for delivering molten casting material to said passage through said intake port, an annular seating surface surrounding said intake port, said supply tube including a nozzle portion at the discharge end thereof having an annular surface sealingly engageable with said seating surface continuously throughout the full 360' thereof, one of said surfaces being of convex arcuate cross section in planes through and including the axis thereof, the radius of curvature of said convex surface being within the range of ,4, of an inch to A of an inch.
13. The apparatus defined in claim 12 in which one of said surfaces is harder than the other.
14. The apparatus defined in claim 12 in which the convex annular surface is harder than the other surface.
15. In die casting apparatus including a die cavity and means providing a passage leading to said die cavity for introducing a charge of molten casting material thereinto, an intake port to said passage, a supply tube for delivering molten casting material to said passage through said intake port, an annular seat surrounding said intake port, said supply tube including a nozzle portion at the discharge end thereof having an annular surface sealingly engageable with said seat continuously throughout the full 360 thereof, said annular surface being of convex arcuate cross-section in planes through and including the axis thereof, the radius of curvature of said annular surface being within the range of of an inch to of an inch.
16. The apparatus defined in claim 15 in which said annular surface is harder than said annular seat.
17. In die casting apparatus including a die cavity and means providing a passage leading to said die cavity for introducing a charge of molten casting material thereinto, an intake port to said passage, a supply tube for delivering molten casting material to said passage through said intake port, a frusto-conical seat surrounding said intake port, said supply tube including a nozzle portion at the discharge end thereof having an annular surface sealingly engageable with said frusto-conical seat continuously throughout the full 360 thereof, said annular surface being of convex arcuate cross-section in planes through and including the axis thereof, the radius of curvature of said annular surface being within the range of ,4, of an inch to A of an inch, said annular surface being harder than said seat.
References Cited in the file of this patent UNITED STATES PATENTS 1,346,077 Carter July 6, 1920 2,084,349 Laise June 22, 1937 2,120,562 Laise June 14, 1938 2,145,553 Morin Jan. 31, 1939 2,195,360 Daesen Mar. 26, 1940 2,618,565 Nicholson Nov. 18, 1952 2,636,825 Nicholson Apr. 28, 1953 2,708,298 Beckes May 17, 1955 FOREIGN PATENTS 716,842 Great Britain Oct. 13, 1954
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2977649A (en) * 1959-03-16 1961-04-04 Glen R Morton Molten metal feeding tube for metal casting machines
US3137903A (en) * 1961-02-13 1964-06-23 Glenn R Morton Molten metal feeding tube for metal casting machines

Citations (9)

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US2084349A (en) * 1934-09-10 1937-06-22 Clemens A Laise Method of making wear resisting materials
US2120562A (en) * 1934-10-11 1938-06-14 Eisler Electric Corp Refractory material and process of making same
US2145553A (en) * 1936-07-20 1939-01-31 Whitehall Patents Corp Discharge device for casting machines
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