US3762906A - Pressurized fluid ram acceleration system - Google Patents

Pressurized fluid ram acceleration system Download PDF

Info

Publication number
US3762906A
US3762906A US00278040A US3762906DA US3762906A US 3762906 A US3762906 A US 3762906A US 00278040 A US00278040 A US 00278040A US 3762906D A US3762906D A US 3762906DA US 3762906 A US3762906 A US 3762906A
Authority
US
United States
Prior art keywords
pressurized fluid
ram
condition
valve
forming
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
Application number
US00278040A
Other languages
English (en)
Inventor
F Dahlman
R Mras
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.)
Corning Glass Works
Original Assignee
Corning Glass Works
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Corning Glass Works filed Critical Corning Glass Works
Application granted granted Critical
Publication of US3762906A publication Critical patent/US3762906A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/16—Gearing or controlling mechanisms specially adapted for glass presses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41572—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and an output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/775—Combined control, e.g. control of speed and force for providing a high speed approach stroke with low force followed by a low speed working stroke with high force, e.g. for a hydraulic press
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/8609—Control during or prevention of abnormal conditions the abnormal condition being cavitation

Definitions

  • the system is, for example, espe- [56] Reierences Cited cially adaptable t operatiorls, such as glass pressing operatlons, 1n WhlCh a ram 15 used to actuate a rela- UNITED STATES PATENTS tively massive pressingplunger to press form a rela- 3,(;gt13,926 9/1972 Anldo 100/269 B tively large article in or on a cooperative mold member, 3,. ,5 l 8/1971 Ke ler 3,385,169
  • a pressurized fluid ram R comprising a cylinder CY embodying a bore B in which is disposed a piston P reciprocatively movable within such bore in the usual manner.
  • piston P is connected to a first end of the usual piston rod PR whose second end is connected to a combined crosshead and forming mold or plunger designated CHFM which is shown schematically only as a square or block for purposes of simplification of the drawing and because the details of such crosshead and forming mold are not a critical part of the invention.
  • a cooperative mold member or forming mold FM is shown as carried on the upper surface or top ofa rotatable table T and is shown directly below the combined crosshead and forming mold CHFM.
  • An article AR which may for example be a large piece of flat glass which has just been press-formed between members CHFM and FM, is shown between the pressforming surfaces of such members.
  • a pressurized fluid intensifier PFI comprises a cylinder CYI embodying a bore Bl including a large diameter bore portion Bla and a substantially smaller bore portion Blb which connects with said portion B10 and is preferably concentric or coaxial with bore portion Bla.
  • a core member or piston is embodied in bore B1 and includes a large piston portion Pla and a small piston portion Plb which fit snugly but slidably within said bore portions Bla and Blb, respectively.
  • a compression spring SP surrounds small piston portion Plb with a first end of such spring bearing against the annular surface of large piston portion PM and the second end of the spring bearing against the inner surface of the wall defining the end of large bore portion Blu of bore Bl where it joins with small bore portion Blb of such bore.
  • a fluid actuated three-position, five-way pressurized fluid flow control valve PFVI, a fluid actuated twoposition, two-way pressurized fluid flow control valve PFV2, a conventional single-direction fluid flow check valve CV1 and a fluid actuated or controlled fluid flow check valve CV2 are also provided.
  • ValvePFVl is controlled by pressurized fluid pilot actuators PVl and PV2 to which pressurized fluid is selectively supplied as, for example, by the usual timing drum such as well known in the art but which is not shown in the drawings for purposes of simplification thereof.
  • valve PFVll normally maintain valve PFVll in a first or its neutral, center or normal position shown 'and, following an actuation of the valve by supplying pressurized fluid to pilot actuator PVl or PV2 and the subsequent termination of such supply of fluid, such springs return valve PFVl to its said neutral or normal position.
  • Valve PFV2 is controlled by a pressurized fluid pilot actuator PV3 to which pressurized fluid isalso selectively supplied as, for example, by the aforesaid timing drum.
  • Valve PFV2 is normally biased or maintained by a compressible spring S3 in a first or normal position as shown in the drawing.
  • pressurized fluid is sup plied to pilot actuator PV3
  • such valve is actuated to its second position against the biasing force provided by spring S3 and, upon the subsequent termination of said supply of fluid, spring S3 again returns the valve to its normal position shown.
  • check valve CV1 is a conventional single-direction check valve of the type well known in the art and the purpose of such valve will be discussed hereinafter.
  • check valve CV2 is a pressurizedfluidactuated or controlled check valve which normally acts as a conventional single-direction check valve but is automatically actuated to a fully open or fluid flow condition and held in such condition when pressurized fluid is supplied to the valve over a control line or conduit hereinafter described and discussed.
  • Pilot actuator PV1 is connected over a conduit 11 to the previously mentioned timing drum which selectively supplies pressurized fluid to such actuator PV1 over said conduit 11 as hereinafter further discussed.
  • Conduit 11 also connects to one end of a conduit 12 whose second end connects to check valve CV2 to selectively supply to such valve pressurized fluid for control of the valve as previously mentioned and as also further hereinafter discussed.
  • Pilot actuator PV2 is connected over a conduit 13 to the previously mentioned timing drum which selectively supplies to such actuator pressurized fluid for actuation thereof as also discussed hereinafter.
  • Conduit 13 also connects to one end ofa conduit 14 whose second end connects to pilot actuator PV3 of valve PFV2 for selective actuation of the latter valve in the manner previously mentioned. This will also be discussed in more detail hereinafter in operational examples of the invention.
  • Valve PFVl is connected over a conduit 15 to a source of pressurized fluid at a pressure, for example, between about 250 to 1,000 p.s.i. Valve PFVl is also connected over a conduit 16 to a source of pressurized fluid at a pressure, for example, of about 50 0 p.s.i. This latter source of pressure is also connected over a conduit 17 to the inlet port of previously mentioned check valve CV1.
  • Valve PFVl is also connected over a conduit 18 to a fluid sink 8K2, and over a conduit 19 to a second end of bore B of cylinder CY of ram R for purpose of supplying pressurized fluid to such end of bore B and, thereby, to cylinder CY for actuation of piston P within the bore of cylinder CY and resultant corresponding actuation of piston rod PR and, actuation of crosshead and forming member CHFM in a direction to press form a desired article such as AR.
  • This will be further mentioned hereinafter in the operational example of the invention.
  • Valve PFVl is also connected over a conduit 20 to the inlet port of check valve CV2, such conduit also connecting with the first end ofa conduit 21 whose second end connects to the low pressure or input port I? of large bore portion Bla of bore B1 of cylinder CYl of pressurized fluid intensifier PFl, that is, connects to said large portion Bla opposite the end of such bore portion which connects to small bore portion Blb of bore B1 of cylinder CYl.
  • the outlet port of check valve CV2 connects over a conduit 23 to the first end of bore B of cylinder CY of ram R for supplying pressurized fluid to the second end of such bore and thereby actuate piston P, piston rod PR, and crosshead and forming member CHFM in a direction, out of contact with and away from a pressed formed article such as AR.
  • the above-mentioned conduit 23 also connects to one end of a conduit 24 whose second end connects to flow control valve PFV2.
  • the outlet port ofcheck valve CV1 is connected over a conduit 26 to valve PFV2 and over a conduit to the high pressure or output port OP of small bore portion Blb of bore B1 of cylinder CY] of pressurized fluid intensifier PFl, that is, to the end of such small bore portion Blb which is opposite the end thereof which joins or connects with large bore portion Bla of bore B1 of cylinder CYl.
  • the end of large bore portion Bla which joins with small bore portion Blb of bore B1 is connected over a conduit 27 to a suitable fluid sink SKI.
  • pressurized fluid is supplied by the previously mentioned timing drum to conduit 11 and thence to pilot actuator PV1, and to conduit 12 and thence to check valve CV2.
  • pressurized fluid actuates check valve CV2 fully open and valve PFVl to its right hand position so that pressurized fluid from the aforesaid 250-l,000 p.s.i.
  • the previously mentioned timing drum is set so that, immediately following the press forming of an article such as AR, it operates, at the earliest possible point in time, to interrupt the control supply of pressurized fluid to pilot actuator PV1 and to immediately supply such pressurized fluid to pilot actuators PV2 and PV3.
  • This causes valve PFVl to move in its left hand direction and valve PFV2 to move in its right hand direction.
  • the pressurized fluid supplied to the second end of cylinder CY is interrupted and such end of the cylinder is immediately connected through valve PFVl to fluid sink 8K2.
  • pressurized fluid source is supplied from conduit 16 through valve PFVl and conduits 20 and 21 to bore portion Bla of bore B1 of cylinder CYl of pressurized fluid intensifier PFl and to the input side of check valve CV2 which is then acting as a conventional check valve since pressurized control fluid is no longer supplied over conduits 11 and 12 to such check valve CV2.
  • the above-mentioned supply of pressurized control fluid to pilot actuator PV3 actuates such valve to in turn actuate valve PFV2 in the right hand direction to cause conduit 26 to be connected through valve PFVZ to conduit 24 and thence to conduit 23.
  • the 500 p.s.i. pressurized fluid supplied through conduit 20 to check valve CV2 flows through such valve to conduit 23 and thence to the first end of bore B of cylinder CY.
  • the previously mentioned static inertia of combined crosshead and forming member CI-IFM and any vacuum or negative pressure existing between such member and the pressed article AR restrains, as previously mentioned, the actuation of piston P and piston rod PR of ram R at such time.
  • the 500 p.s.i. pressure in the system and supplied over conduit 21 to bore portion Bla of cylinder CYl of pressurized fluid intensifier PSI urges the piston of the intensifier in a direction such that a substantially multiplied pressure is generated in bore portion Blb of cylinder CY].
  • This multiplied pressure is supplied through conduits 25 and 26, and valve PFVZ, to conduit 24 and thence to conduit 23 and the first end of the bore B of cylinder CY.
  • Such increased pressure is exerted against the end of piston P which is connected to piston rod PR and rapidly overcomes said static inertia and vacuum or nega' tive pressure and causes such piston to rapidly start and move member CHFM out of contact with article AR at a rate proportional to the force or pressure multiplication or intensification of intensifier PFI.
  • check valves CV1 and CV2 begins to flow through such check valves to conduit 23 and thence to the first end of bore B of cylinder CY of ram R to continue the movement of piston P, piston rod PR and the combined crosshead and forming member CHFM.
  • the timing drum terminates the supply of control pressure to pilot actuators PV2 and PV3 and valves PFVl and PFVZ then return to their normal positions thereby also terminating the supply of pressure to the first end of bore B of cylinder CY and piston P comes to rest.
  • pilot actuator PVl valve PFVl is actuated to the right and line I? is connected to line and line to fluid sink 8K2.
  • Control pressure also opens check valve CV2 permitting pressurized fluid to flow from cylinder CY over line 23 and to said fluid sink 8K2. This generates a back pressure in line 20 until the piston comes to rest against article AR.
  • a control system for rapid acceleration of the ram from a condition of rest to a condition of linear motion comprising;
  • a pressurized fluid intensifier including a low pres sure input port and ahigh pressure output port
  • a conventional single-direction fluid flow check valve having an inlet port connected to a first source of pressurized fluid and an outlet port connected to said output port of said pressurized fluid intensifier;
  • a controlled check valve normally operating as a fluid flow check valve for fluid flow therethrough in a direction only between an inlet port and an outlet port of such valve and actuable to a second condition for fluid flow therethrough in' a direction between said outlet and inlet ports of the valve, such inletport connected to said input port of said pressurized fluid intensifier;
  • IV. means including a two-position fluid flow control valve normally in a first condition in which flow of fluid therethrough is blocked and actuable toa second condition for connecting said output port of said intensifier with a first end of said cylinder and said outlet port of said controlled check valve;
  • V. means including a three-position fluid flow control valve normally in a first condition in which flow of fluid therethrough is blocked, such valve actuable to a second condition in which said inlet port of said controlled check valve is connected to a fluid sink and the second end of said cylinder is connected to a second source of pressurized fluid, and actuable to a third condition in which said inlet port of said controlled check valve is connected to said first source of pressurized fluid and said second end of said cylinder is connected to a fluid sink;
  • VI. means for at times simultaneously actuating said controlled check valve and said three-position valve to their said second conditions
  • a piston including coaxial large and small piston portions disposed in said large and small bore portions respectively of said cylinder in arelatively snug but reciprocatively slidable relationship with each respective bore portion.
  • a control system for rapid acceleration of the ram from a condition of rest to a condition of linear motion comprising;
  • a first pressurized fluid flow control valve having a first non-flow position and actuable to second and third positions for selectively controlling fluid flow therethrough;
  • a second pressurized fluid flow control valve having a first non-flow position and actuable to a second position for fluid flow therethrough;
  • a controlled valve normally operating as a fluid flow check valve for fluid flow therethrough in only a single direction and actuable to a fully open condition for unchecked pressurized fluid flow there through in a direction opposite to said single direction;
  • V a pressurized fluid intensifier including a low pressure input port and a high pressure output port with such output port connected with the outlet port of said conventional check valve;
  • VI. means including said first control valve, when actuated to its said second position, and said controlled check valve, when actuated, for connecting first and second end of said pressurized fluid cylinder with a fluid sink and a second source of pressurized fluid, respectively;
  • means including said first control valve, when actuated to its said third position, for connecting said input port of said pressurized fluid intensifier with said first source of pressurized fluid and said second end of said pressurized fluid cylinder with a fluid sink, respectively;

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Presses (AREA)
  • Valve Device For Special Equipments (AREA)
US00278040A 1972-08-04 1972-08-04 Pressurized fluid ram acceleration system Expired - Lifetime US3762906A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US27804072A 1972-08-04 1972-08-04

Publications (1)

Publication Number Publication Date
US3762906A true US3762906A (en) 1973-10-02

Family

ID=23063438

Family Applications (1)

Application Number Title Priority Date Filing Date
US00278040A Expired - Lifetime US3762906A (en) 1972-08-04 1972-08-04 Pressurized fluid ram acceleration system

Country Status (8)

Country Link
US (1) US3762906A (de)
JP (1) JPS4953614A (de)
BE (1) BE803206A (de)
DE (1) DE2339168A1 (de)
FR (1) FR2194892A1 (de)
GB (1) GB1416772A (de)
IT (1) IT992785B (de)
NL (1) NL7310770A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953187A (en) * 1973-12-10 1976-04-27 Lynch Corporation Control system for hydraulic rams
US4196084A (en) * 1976-09-21 1980-04-01 Eberhard Hoesch & Sohne Gmbh & Co. Plate filter press
US4896594A (en) * 1986-11-28 1990-01-30 L. Schuler Gmbh Drawing installation for a press
WO1995028360A1 (en) * 1994-04-15 1995-10-26 Libbey-Owens-Ford Co. Control system for glass bending platen
US20090275441A1 (en) * 2008-05-02 2009-11-05 Gm Global Technology Operations, Inc. Flow accumulator and clutch control system for automatic transmissions

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4783106A (en) * 1986-08-04 1988-11-08 Nutter Ralph E Method and apparatus for automatically controlling pressure in fluid-actuated systems
CN102259433B (zh) * 2011-07-20 2014-04-09 王军 液压机
CN105889159B (zh) * 2016-04-25 2018-01-23 天津优瑞纳斯智能装备有限公司 一种具备超高压输出能力的液压系统
CN108343653B (zh) * 2018-03-02 2024-01-05 广东粤山新材料科技有限公司 一种热压炉的液压系统

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953187A (en) * 1973-12-10 1976-04-27 Lynch Corporation Control system for hydraulic rams
US4196084A (en) * 1976-09-21 1980-04-01 Eberhard Hoesch & Sohne Gmbh & Co. Plate filter press
US4896594A (en) * 1986-11-28 1990-01-30 L. Schuler Gmbh Drawing installation for a press
WO1995028360A1 (en) * 1994-04-15 1995-10-26 Libbey-Owens-Ford Co. Control system for glass bending platen
US20090275441A1 (en) * 2008-05-02 2009-11-05 Gm Global Technology Operations, Inc. Flow accumulator and clutch control system for automatic transmissions
US7980374B2 (en) * 2008-05-02 2011-07-19 GM Global Technology Operations LLC Flow accumulator and clutch control system for automatic transmissions

Also Published As

Publication number Publication date
GB1416772A (en) 1975-12-10
NL7310770A (de) 1974-02-06
IT992785B (it) 1975-09-30
DE2339168A1 (de) 1974-02-14
FR2194892A1 (de) 1974-03-01
BE803206A (fr) 1974-02-04
JPS4953614A (de) 1974-05-24

Similar Documents

Publication Publication Date Title
US2145956A (en) Die casting machine
US2565639A (en) Platen leveling multiple ram press
US3762906A (en) Pressurized fluid ram acceleration system
US3267677A (en) Impact forming machine
US2070720A (en) Hydraulic press operating circuits and valves therefor
US2009487A (en) Hydraulic press
US2259576A (en) Press with dual sliding table
US2855628A (en) Pressure bonding system for solid particles
US2465580A (en) Fluid-pressure-responsive control circuit for die-casting presses
US3033170A (en) Hydraulic ram apparatus
US2926412A (en) Press
US2683966A (en) Hydraulic press
US4890998A (en) Press for manufacture of dimensionally stable articles from powdered material
GB939951A (en) Improvements relating to booster-assisted hydraulic systems
US2790305A (en) Control valves for hydraulic presses
US3016005A (en) Hydraulic press
US2766586A (en) Control valves for hydraulic presses
GB1278155A (en) Counter-blow hammer
US2229965A (en) Hydraulic press circuit
US2343177A (en) Hydraulic press
US2396296A (en) Fluid operated motor
US2620776A (en) Variable stroke final slow closing and initial slow opening hydraulic ram
US3727519A (en) Hammer with a ram control device
US2603176A (en) Hydraulic blankholder press and operating circuit therefor
US3043425A (en) Extrusion press and control therefor