US2804666A - Pressure casting piston machines - Google Patents

Pressure casting piston machines Download PDF

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Publication number
US2804666A
US2804666A US370822A US37082253A US2804666A US 2804666 A US2804666 A US 2804666A US 370822 A US370822 A US 370822A US 37082253 A US37082253 A US 37082253A US 2804666 A US2804666 A US 2804666A
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United States
Prior art keywords
piston
cylinder
injection
metal
ladle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US370822A
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English (en)
Inventor
Saives Leon
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Renault SA
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Individual
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Filing date
Publication date
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Publication of US2804666A publication Critical patent/US2804666A/en
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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
    • B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
    • B22D17/12—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with vertical press motion

Definitions

  • the invention has for its object various improvements applied to machines for casting ferrous metals under pressure and particularly to the pistons and to the ladle cylinder.
  • Machines adapted for casting articles under pressure are known in which the liquid metal, first of all poured into a ladling on ladle cylinder of special steel communicating with the mould, is displaced into the mould by a hydraulic piston.
  • the passage connecting the ladle cylinder to the injection cylinder is disposed axially of the ladle cylinder. This arrangement favours the production of splashes of metal which solidify more quickly than the mass of the metal and these small fragments obstruct the casting passage towards the mould.
  • Figure 1 is a sectional view taken on line 8 of Fig. 8 showing a scraper piston for the pouring hole.
  • Figure 2 shows a sealing arrangement applied to an injector piston.
  • Figure 3 is a sectional view of the sealing cup.
  • Figures 4 and 5 respectively show a sectional elevation of the end of the ladle cylinder and a plan view of the end of this cylinder.
  • Patented Sept. 3, 1957 Figures 6 and 7 respectively show by way of example an embodiment of a forcing piston at the commencement and end of the injection.
  • Fig. 8 is a vertical sectional view of the complete assembly of the machine in accordance with the invention.
  • FIG. 1 is a transverse section showing a part of a pressure casting machine modified in accordance with the invention.
  • the wall of the pouring hole has a lining 1 of refractory material.
  • a piston 2 operated by a jack (not shown) may slide in the lining as far as the external level of the ladle cylinder 3.
  • the surface and the path of the piston are arranged in such manner that at the end of its travel, the piston may form the Wall of the ladle cylinder in order to avoid the rising of the metal at the commencement of the action of the ladle piston.
  • Figure 1 shows the invention applied to a pressure casting machine in which the ladle cylinder is horizontal.
  • the invention is obviously applicable to any machine for casting under pressure.
  • the invention has for an object a sealing system applicable to pistons of all kinds and obviating the disadvantages of the known arrangements.
  • the piston 4 carries a dished plate or cup 5 of the .shape shown in Figures 2 and 3.
  • the jet of metal coming from the ladle cylinder 6 is directed in accordance with an inclined helix with an angle towards the base which may be of the order of 20.
  • the communication passage is constricted in the last portion A of the ladle cylinder and opens tangentially to the walls of injection cylinder 7.
  • the liquid metal arriving tangentially is twisted helically towards the base of the injection cylinder 7 and thus does not cause any splashes.
  • Figure 6 shows by way of example one embodiment of this forcing system which is applied to a casting machine in which the joint plane of the mould is horizontal, the ladle cylinder i horizontal and is disposed below the mould, the latter being supplied at the bottom by a vertical injection cylinder.
  • Figure 7 shows the arrangement of the pistons on completion of injection.
  • the piston 8 is disposed in the injection cylinder 9 and has on its inner end a cup So like cup 5 of Figs. 2 and 3.
  • the forcing piston is located in the forcing cylinder 11 and has on its inner end a cup 552 like cup 5 of Figs. 2 and 3. Its diameter is approximately two-thirds ofthe diameter of the injection cylinder and when at rest it leaves a free space 13 between its face and the chamber 12 which communicates with the mold (not shown) through a passageway 15.
  • the piston 8 After the lading cylinder piston 4 (Fig. 8) has filled the injection cylinder 9 with liquid steel, the piston 8 is set in motion in an upward direction and commences to fill the chamber 12 and the mould (not shown). steel being solidified on the walls of the injection cylinder 9 forms a tube. This tube offers a resistance suflicient to stop completely the rising movement of the injection piston before the filling of the mould is completed.
  • the metal which has filled the free space 13 between the chamber 12 and the forcing piston 10 has solidified and there is then initiated the movement of compression of the forcing piston 10. It is the solidified metal slug 13a in front of the forcing piston which directly exerts the compressive stress on the metal. Losses of metal are avoided owing to the good adjustment of the slug in the cylinder and since the forcing piston does not penetrate into the viscous metal, there is no difficulty in extracting the piston.
  • the slug 13a is removed when the cast article is trimmed.
  • the arrangement of the forcing piston has been given by way of example axially of the injection piston.
  • a pressure casting piston machine in combination, means defining a chamber, a passageway leading from said chamber to a mold, a forcing cylinder opening into said chamber, an injection cylinder opening into said chamber, a ladling cylinder communicating with said injection cylinder, the communication between said ladling cylinder and injection cylinder comprising a converging passageway extending from an end of said ladling cylinder and opens tangentially into the injection cylinder in a downwardly inclined helical direction, a pouring passage opening laterally from said ladling cylinder for charging a molten metal into said ladling cylinder, said passage having a cylindrical lining of refractory material, a scraping piston movable into said passage, said piston having a cylindrically curved inner end and being movable to an inner position in which it closes said passage and said inner end is substantially flush with the wall of said ladling cylinder, a piston movable in said ladling cylinder to force metal from said ladling cylinder helically into the injection cylinder
  • a pressure casting piston machine in combination, an injection cylinder, a piston reciprocable in said cylinder, a ladling cylinder disposed at substantially right angles to said injection cylinder and communicating at one end with said injection cylinder, said end of the ladling cylinder converging progressively to provide a connecting passageway of reduced cross section that opens tangentially into the injection cylinder in a downwardly inclined helical direction, means for charging a molten metal into said ladling cylinder and a piston movable in said ladling cylinder to force molten metal through said converging passageway helically into said injection cylinder.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
US370822A 1952-08-28 1953-07-28 Pressure casting piston machines Expired - Lifetime US2804666A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2804666X 1952-08-28

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Publication Number Publication Date
US2804666A true US2804666A (en) 1957-09-03

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US370822A Expired - Lifetime US2804666A (en) 1952-08-28 1953-07-28 Pressure casting piston machines

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2932865A (en) * 1957-01-23 1960-04-19 Nat Lead Co Cold chamber shot end with loose piece arrangement
US3068539A (en) * 1960-08-04 1962-12-18 Thompson Ramo Wooldridge Inc High pressure permanent molding
US3092880A (en) * 1959-08-25 1963-06-11 Glen R Morton Die casting machine plunger tip
US3120038A (en) * 1962-08-29 1964-02-04 Cast Forge Corp High pressure permanent molding
US3613768A (en) * 1968-01-31 1971-10-19 Toyoda Chuo Kenkyusho Kk Liquid metal forging process
DE2337648A1 (de) * 1972-08-17 1974-02-28 Nippon Light Metal Co Spritzgussmaschine
US4152820A (en) * 1978-02-09 1979-05-08 Dorzok Leroy D Method of expanding shot tip
US4436140A (en) 1979-01-26 1984-03-13 Honda Giken Kogyo Kabushiki Kaisha Method of charging molten metal into a vertical die casting machine
US5343927A (en) * 1990-10-05 1994-09-06 Tour & Andersson Ab Method and a device for press casting

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US969539A (en) * 1908-06-16 1910-09-06 Compressed Metal Company Casting apparatus.
GB336129A (en) * 1929-11-07 1930-10-09 Paul Haessler Process and apparatus for controlling the movable mold parts and the pressure piston of extrusion casting machines
GB376319A (en) * 1930-02-11 1932-07-04 Emil Thieslack Improvements in and relating to die-casting machines
US1935059A (en) * 1931-01-02 1933-11-14 Pack Charles Die casting
US1941199A (en) * 1932-04-18 1933-12-26 Roman C Brotz Casting apparatus
US2112342A (en) * 1935-02-07 1938-03-29 Lester Engineering Co Pressure casting machine
US2181157A (en) * 1938-11-16 1939-11-28 Aluminum Co Of America Method and apparatus for pressure casting
US2183112A (en) * 1936-08-07 1939-12-12 Firm Injecta Ag Die casting machine
US2206211A (en) * 1936-02-13 1940-07-02 Wagner Karl Friedrich Casting press
US2564885A (en) * 1949-06-28 1951-08-21 Sternberg Jaime De Injection mechanism for pressure die-casting machines

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US969539A (en) * 1908-06-16 1910-09-06 Compressed Metal Company Casting apparatus.
GB336129A (en) * 1929-11-07 1930-10-09 Paul Haessler Process and apparatus for controlling the movable mold parts and the pressure piston of extrusion casting machines
GB376319A (en) * 1930-02-11 1932-07-04 Emil Thieslack Improvements in and relating to die-casting machines
US1935059A (en) * 1931-01-02 1933-11-14 Pack Charles Die casting
US1941199A (en) * 1932-04-18 1933-12-26 Roman C Brotz Casting apparatus
US2112342A (en) * 1935-02-07 1938-03-29 Lester Engineering Co Pressure casting machine
US2206211A (en) * 1936-02-13 1940-07-02 Wagner Karl Friedrich Casting press
US2183112A (en) * 1936-08-07 1939-12-12 Firm Injecta Ag Die casting machine
US2181157A (en) * 1938-11-16 1939-11-28 Aluminum Co Of America Method and apparatus for pressure casting
US2564885A (en) * 1949-06-28 1951-08-21 Sternberg Jaime De Injection mechanism for pressure die-casting machines

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2932865A (en) * 1957-01-23 1960-04-19 Nat Lead Co Cold chamber shot end with loose piece arrangement
US3092880A (en) * 1959-08-25 1963-06-11 Glen R Morton Die casting machine plunger tip
US3068539A (en) * 1960-08-04 1962-12-18 Thompson Ramo Wooldridge Inc High pressure permanent molding
US3120038A (en) * 1962-08-29 1964-02-04 Cast Forge Corp High pressure permanent molding
US3613768A (en) * 1968-01-31 1971-10-19 Toyoda Chuo Kenkyusho Kk Liquid metal forging process
DE2337648A1 (de) * 1972-08-17 1974-02-28 Nippon Light Metal Co Spritzgussmaschine
US4152820A (en) * 1978-02-09 1979-05-08 Dorzok Leroy D Method of expanding shot tip
US4436140A (en) 1979-01-26 1984-03-13 Honda Giken Kogyo Kabushiki Kaisha Method of charging molten metal into a vertical die casting machine
US5343927A (en) * 1990-10-05 1994-09-06 Tour & Andersson Ab Method and a device for press casting

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BE520833A (en))

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