US3891126A - Injection cylinders of die cast machines - Google Patents

Injection cylinders of die cast machines Download PDF

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Publication number
US3891126A
US3891126A US412548A US41254873A US3891126A US 3891126 A US3891126 A US 3891126A US 412548 A US412548 A US 412548A US 41254873 A US41254873 A US 41254873A US 3891126 A US3891126 A US 3891126A
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United States
Prior art keywords
cylinder
liquid
piston
gas
accumulator
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Expired - Lifetime
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US412548A
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English (en)
Inventor
Kazuyoshi Segawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shibaura Machine Co Ltd
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Toshiba Machine Co Ltd
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Filing date
Publication date
Application filed by Toshiba Machine Co Ltd filed Critical Toshiba Machine Co Ltd
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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
    • B22D17/32—Controlling equipment

Definitions

  • This invention relates to a die cast machine. more particularly to a fluid pressure operated injection cylinder of a die cast machine capable of operating at a high speed and under a high pressure.
  • high speed liquid pressure cylinder therein-after. merely termed high speed cylinder
  • high pressure liquid is admitted into a vessel (hereinafter, merely termed a pressure accumulator) sealed with compressed gas. the gas is com pressed to store energy in the pressure accumulator. and the high pressure liquid is admitted into the high speed cylinder at a high speed through a direction change over valve. a speed regulator. etc. by the ex pansion of the gas in the pressure accumulator, thus moving at a high speed the piston of the high speed cylinder.
  • a conventional liquid pressure circuit since the liquid flows at an extremely high speed through the conduit extending between the pressure accumulator and the high speed cylinder.
  • an injection cylinder of a die cast machine of the class wherein the piston of the cylinder is moved in the forward and rearward directions by admitting and discharging pressuri/ed fluid into and out of the cylinder.
  • a gas accumulator containing pressurized gas and connected to the cylinder on one side ofthe piston for tnoving the piston in the forward direction by the evpansion of said pressuri/ed gas for performing injection moulding.
  • a source of pressurized liquid means for admitting the pressuri/cd liquid into the cylinder on the opposite side of the piston to mine the same in the rearward direction thereby compressing the gas in the gas accumulator.
  • FIG. I is a diagrammatic representation of a typical prior art high pressure. large output liquid pressure cylinder
  • FIG. 2 is a diagrammatic representation of the basic form of this invention.
  • FIG. 3 is a diagram showing a modified embodiment of this invention applied to an injection cylinder of a cold chamber type die cast machine.
  • FIG. I shows a typical construction of a prior art liquid pressure circuit for the injection cylinder of a die cast machine.
  • the liquid pressure circuit shown therein comprises a cylinder 1 containing a piston 2 whose piston rod 24: acts as a piston of an injection cylinder 20 for injecting molten metal into a metal mould of a die cast machine. not shown. and an accumulator 3 containing pressurized liquid 21 and compressed gas 22 thereabove.
  • the pressurized liquid 2I is forced into accumulator 3 from a pump 23 via a conduit L and a check valve 6 to compress gas 22. thus storing energy therein.
  • a change over valve 4 is operated toward the left.
  • the pressurized liquid 2I in accumulator 3 flows into cylinder 2 via a flow control valve 5 and a conduit 7 to move piston 2 toward the left.
  • this flow of the liquid being assisted by the expansion of the compressed gas 22, whereby the piston 2 is moved at an extremely high speed to inject the molten metal in the injection cylinder 20 into the metal mould.
  • the liquid in the cylinder 1 to the left of piston 2 is returned to a reservoir. not shown. via change over valve 4, and a stop valve 9 is held closed.
  • the piston 2 acts to apply pressure to the cast metal.
  • this conventional liquid pressure circuit as the liquid flows through conduit 7 at an ex tremely high speed during the forward or injection stroke of piston 2. when piston 2 is stopped after completely filling the metal mould to begin to apply pressure to the cast metal an extremely severe water hammering phenomenon occurs.
  • FIG. 2 shows a diagram of the liquid circuit embodying the invention in which elements corresponding to those shown in FIG. I are designated by the same reference characters.
  • chamber B ofcylindcr I to the right ofpiston 2 is communicated with a sealed gas accumulator 3 through a relatively thick conduit 71! and liquid under pressure is admitted into chamber C of cylinder 1 to the left of piston 2 from pump 23 via a check valve 64:. change over valve 4 and a flow control valve 50 which are connected in conduit 8.
  • a check valve 10 is connected in parallel with flow control valve Su and a pressure meter I I is provided for accumulator ll.
  • the liquid circuit is designed such that the force applied to the left-hand side of piston 2 by the pressurized liquid is larger than that applied to the righthand side of piston 2 by the compressed gas in accumulator 3.
  • stop valve 9 is held closed. I'nder these conditions. upon operation of pump 23.
  • the resistance of a conduit of a given diameter to the flow of gas is evtremely small so that it is possible to greatly increase the operating speed ofthe piston relative to the prior art liquid circuit.
  • the speed of the piston 2 during the forward stroke (to the left as viewed in FIG. 2 can be controlled by the flow control valve 5.
  • the check valve 10 connected in parallel with flow control valve 5 functions to eliminate the resis tance to the How of liquid afforded by check valve 5 when the piston 2 is returned.
  • FIG. 3 diagrammatically shows a modification of this invention applied to the injection cylinder of a cold chamber type die cast machine. in which elements corresponding to those shown in FIG. 2 are designated by the same reference characters.
  • a second llow control valve Sb is added to operate the piston 2 at any one oftvvo speeds.
  • a second accumulator [4 connected to the output of the pump through a stop valve 15. and a stop valve 16 for connecting the accumulator 3 to the output of pump 23.
  • a predetermined quantity of liquid 2] is charged in accumulator 3 for the purpose of adjusting the pressure of the gas contained therein.
  • a pilot chcclv valve It is inserted between piston l and change over valve 4.
  • 'l he pilot check valve ltl is normally held open by the electrically operated change over valve l2 so that upon interruption of electric supply.
  • valve 10 is closed to prevent accidental forward movement of piston 2.
  • valve 4 is switched to discharge the pressuri/ed liquid in chamber through conduit 8.
  • valves 10 and 4 and the low speed llovv control valve 5h Accordingly. piston 2 is advanced at a low speed by the pressure of the gas in accumulator 3.
  • changeover valve 13 is energized to switch the How control valve to high speed side in. thus increasing the speed of piston 2.
  • valve 4 is svvitched to the original state to again supply the pressurized liquid from pump 23 to chamber (1 thus retracting piston 2. Accordingly. the gas is again compressed in accumulator 3.
  • valve 15 is opened normally to cause the pressuri/ed liquid in accumulator H to assist pump 23.
  • valve 16 is opened when it it desired to increase the gas pressure in the accumulator.
  • This invention has the following advantages.
  • the device can produce a large output and can operate stably during the forward stroke
  • a die cast machine utili/ing the novel pressurized liquid circuit has the following advantages:
  • the improvement which comprises a gas accumulator containing pressuri/cd gas and a predetermined quantity of liquid. said predetermined quantity of liquid being used for adjusting the pressure of the gas contained in said accumulator. said gas accumulator having substantially larger volume than said cylinder. at llow control valve connected between said cylinder and said gas accumulator l'or admitting said gas into said cylinder thereby moving said piston in the forward di rection by the expansion olsaid pressuri/ed gas for per forming die casting.
  • a source of pressuri/ed liquid means operatively coupled l'or admitting said pressurized liquid into said cylinder on the opposite side of said piston to move the same in the rearward direction therehy compressing the gas in said gas accumulator. and means opcratnely coupled for controlling the llovv rate of said pressurized liquid while the liquid is discharged from said cylinder when said piston is moved in the forward direction 2.
  • said tlovv controlling means is comprised of a valve and further comprising a check valve connected in parallel with said valve. said check valve opening when the pressurized liquid is admitted into said cylinder from said source.
  • the injection cylinder according to claim l which further comprises an accumulator for said pressurized liquid and a normal open valve connecting said liquid accumulator to said source of pressurized liquid.
  • the injection cylinder according to claim 1 wherein said flow rate controlling means comprises a plurality ol flow control valves for providing different flow rates 5.
  • the injection cylinder according to claim I which further comprises a pilot check valve connected in the conduit of said pressurized liquid and an electrically operated valve means for normally holding said pilot valve in an opened state so that said pilot check valve is closed when supply of electricity is interrupted.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
US412548A 1972-11-14 1973-11-05 Injection cylinders of die cast machines Expired - Lifetime US3891126A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11448272A JPS5312033B2 (enrdf_load_stackoverflow) 1972-11-14 1972-11-14

Publications (1)

Publication Number Publication Date
US3891126A true US3891126A (en) 1975-06-24

Family

ID=14638836

Family Applications (1)

Application Number Title Priority Date Filing Date
US412548A Expired - Lifetime US3891126A (en) 1972-11-14 1973-11-05 Injection cylinders of die cast machines

Country Status (5)

Country Link
US (1) US3891126A (enrdf_load_stackoverflow)
JP (1) JPS5312033B2 (enrdf_load_stackoverflow)
CH (1) CH569575A5 (enrdf_load_stackoverflow)
DE (1) DE2356711A1 (enrdf_load_stackoverflow)
IT (1) IT996420B (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022269A (en) * 1975-07-31 1977-05-10 Toshiba Kikai Kabushiki Kaisha Die cast machines
US4036405A (en) * 1973-11-19 1977-07-19 Braas & Co. Gmbh Injection molding machine with feed control
US4334636A (en) * 1979-12-27 1982-06-15 Paul William A Apparatus for handling gasket-forming material
US4424674A (en) 1977-08-01 1984-01-10 Roland Geier Die casting machine
US4729224A (en) * 1984-06-04 1988-03-08 Mcateer James D Installation, apparatus and method for actuating doors, gates and the like under extreme environmental conditions
US4872613A (en) * 1987-05-18 1989-10-10 Hucul Daniel E Mastic adhesive fixture
US5052468A (en) * 1989-09-20 1991-10-01 Diecasting Machinery & Rebuilding Co. Method and apparatus for die casting shot control
US5921604A (en) * 1996-05-16 1999-07-13 Applied Power Inc. Hydraulic door operating system
US6385969B1 (en) * 1999-09-10 2002-05-14 Hoerbiger Hydraulik Gmbh Arrangement for hydraulic actuation of a movable component on a vehicle
WO2003101881A1 (fr) * 2002-05-31 2003-12-11 Xuanzhe Hu Procede et dispositif de commande d'un appareil hydraulique dont le verin est capable de venir dans une position de travail souhaitee de maniere iterative
US20090094897A1 (en) * 2007-06-04 2009-04-16 Gregg Dane W Liftgate hydraulic closure cylinder
CN106438552A (zh) * 2016-08-30 2017-02-22 广东宝洋科技有限公司 一种液压系统

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5187425A (ja) * 1975-01-31 1976-07-31 Toyota Motor Co Ltd Kojutenkinzokuyodaikasutokino shashutsusochi
JPS5198764A (ja) * 1975-02-27 1976-08-31 Shashutsuseikeisochino shashutsuhoho
DE3125598A1 (de) * 1981-06-30 1983-01-13 Mahle Gmbh, 7000 Stuttgart Einrichtung zur druckbeaufschlagung des presszylinders einer druckgiessmaschine
JPH0248261U (enrdf_load_stackoverflow) * 1989-08-31 1990-04-03
DE102011054616B3 (de) * 2011-10-19 2013-02-07 Parker Hannifin Manufacturing Germany GmbH & Co. KG Hydraulisch angetriebene Anordnung zum linearen Bewegen eines Massekörpers

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2088134A (en) * 1933-05-31 1937-07-27 Haessler Paul Die-casting and pressure molding machine
US2163982A (en) * 1935-03-11 1939-06-27 Mereier Jean Fluid-operated jack
US2224956A (en) * 1938-05-23 1940-12-17 Hydraulic Dev Corp Inc Press with rapid-closing upwardacting ram
US3632246A (en) * 1968-10-01 1972-01-04 Meiki Seisakusho Kk Injection molding apparatus
US3638423A (en) * 1969-04-24 1972-02-01 Ihc Holland Nv Pneumatic tool

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2088134A (en) * 1933-05-31 1937-07-27 Haessler Paul Die-casting and pressure molding machine
US2163982A (en) * 1935-03-11 1939-06-27 Mereier Jean Fluid-operated jack
US2224956A (en) * 1938-05-23 1940-12-17 Hydraulic Dev Corp Inc Press with rapid-closing upwardacting ram
US3632246A (en) * 1968-10-01 1972-01-04 Meiki Seisakusho Kk Injection molding apparatus
US3638423A (en) * 1969-04-24 1972-02-01 Ihc Holland Nv Pneumatic tool

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4036405A (en) * 1973-11-19 1977-07-19 Braas & Co. Gmbh Injection molding machine with feed control
US4022269A (en) * 1975-07-31 1977-05-10 Toshiba Kikai Kabushiki Kaisha Die cast machines
US4424674A (en) 1977-08-01 1984-01-10 Roland Geier Die casting machine
US4334636A (en) * 1979-12-27 1982-06-15 Paul William A Apparatus for handling gasket-forming material
US4729224A (en) * 1984-06-04 1988-03-08 Mcateer James D Installation, apparatus and method for actuating doors, gates and the like under extreme environmental conditions
US4872613A (en) * 1987-05-18 1989-10-10 Hucul Daniel E Mastic adhesive fixture
US5052468A (en) * 1989-09-20 1991-10-01 Diecasting Machinery & Rebuilding Co. Method and apparatus for die casting shot control
US5921604A (en) * 1996-05-16 1999-07-13 Applied Power Inc. Hydraulic door operating system
US6385969B1 (en) * 1999-09-10 2002-05-14 Hoerbiger Hydraulik Gmbh Arrangement for hydraulic actuation of a movable component on a vehicle
WO2003101881A1 (fr) * 2002-05-31 2003-12-11 Xuanzhe Hu Procede et dispositif de commande d'un appareil hydraulique dont le verin est capable de venir dans une position de travail souhaitee de maniere iterative
US20090094897A1 (en) * 2007-06-04 2009-04-16 Gregg Dane W Liftgate hydraulic closure cylinder
CN106438552A (zh) * 2016-08-30 2017-02-22 广东宝洋科技有限公司 一种液压系统
CN106438552B (zh) * 2016-08-30 2018-03-16 广东宝洋科技有限公司 一种液压系统

Also Published As

Publication number Publication date
DE2356711A1 (de) 1974-05-16
JPS4971369A (enrdf_load_stackoverflow) 1974-07-10
CH569575A5 (enrdf_load_stackoverflow) 1975-11-28
JPS5312033B2 (enrdf_load_stackoverflow) 1978-04-26
IT996420B (it) 1975-12-10

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