US3732691A - Method and apparatus for producing high hydraulic pressure, particularly for operating a forging press - Google Patents

Method and apparatus for producing high hydraulic pressure, particularly for operating a forging press Download PDF

Info

Publication number
US3732691A
US3732691A US00111182A US3732691DA US3732691A US 3732691 A US3732691 A US 3732691A US 00111182 A US00111182 A US 00111182A US 3732691D A US3732691D A US 3732691DA US 3732691 A US3732691 A US 3732691A
Authority
US
United States
Prior art keywords
pressure
storage tank
transducer
hydraulic fluid
press
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
US00111182A
Other languages
English (en)
Inventor
E Muller
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.)
Individual
Original Assignee
Individual
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
Priority claimed from DE19702013120 external-priority patent/DE2013120C/de
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3732691A publication Critical patent/US3732691A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/10—Drives for forging presses
    • B21J9/12—Drives for forging presses operated by hydraulic or liquid pressure
    • B21J9/16—Drives for forging presses operated by hydraulic or liquid pressure in conjunction with steam or gas power
    • 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
    • F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids

Definitions

  • a method for producing high hydraulic pressures for rapidly moving press pistons using a pressure transducer for example, a piston of two distinct diameters moving in associated cylinders, comprises storing gas at high pressure in a storage container and feeding the high pressure gas to the pressure transducer during the operation thereof.
  • the primary or large diameter part of the transducer is connected to a gas chamber under high pressure.
  • the gas chamber is supplied with the gas at high pressure by a separate pump.
  • the transmission ratio of the gas pressure to the liquid pressure in a pressure transducer varies between (1 to 2 and 1 to 5) 1:2 and 1:5.
  • the apparatus includes an arrangement in which there is a second pressure transducer which is connected to the first transducer for effecting the return stroke thereof and which includes a secondary side which is in communication with the secondary side of the first transducer during the forward stroke thereof.
  • the secondary side of the second transducer is fed, for example, from an air vessel under pressure while the primary side is in communication with a high level pressure storage tank.
  • Heavy hydraulic forging presses are used mainly in aircraft construction for the production of airplane parts of light metals and their alloys.
  • the maximum pressure is only required on a relatively small working stroke.
  • the presses are equipped only for high operating pressure, which is produced by a pressure transducer whose primary part is admitted with pressure fluid from a high pressure tank for an operating pressure of about 200 300 excess atmospheres.
  • Such presses have a hand control.
  • the secondary part of the pressure transducer is in communication with the working cylinder of the press and produces in the latter the maximum operating pressure of 500 excess atmospheres and more. This is achieved by filling the working cylinder during the idle down stroke of the press with low pressure fluid, for example, from a high pressure storage tank or air vessel.
  • the idle stroke is .followed by a rough pressing strike effected with pressure fluid from the high pressure reservoir.
  • the pressure fluid from the high pressure reservoir can be conducted to the primary part of the pressure transducer and the pressure can be increased to the maximum value.
  • the piston of the pressure transducer covers a long distance, relative to the press stroke, at a relatively low speed.
  • the invention provides a method and a press plant with which this problem can be solved. It is based on the idea of satisfying the sudden high energy requirement in carrying out the pressure stroke at maximum pressure and long distance by admitting the pressure transducer not with high pressure fluid, but with high pressure gas from the high pressure reservoir.
  • the gas can be conducted at high velocity through a relatively narrow pipe cross-section. If high pressure fluid is to be passed to the pressure transducer, a multiple of the pipe cross-section would be required, and this factor becomes more important when there is a high pressure line between the central station, where the high pressure reservoir is installed, and the press, and which is usually much longer than the connection between the press and the pressure transducer installed nearby.
  • the return of the piston in the pressure transducer is solved in a fortunate manner by using a second, smaller pressure transducer or back-pressure transducer.
  • This back-pressure transducer is fed again in the primary part from the high pressure reservoir, namely, from a liquid chamber.
  • the transducer piston In its secondary part there is produced, by the transducer piston, a pressure somewhat higher than in the secondary part of the pressure transducer, which latter is connected to this secondary part. Consequently, the piston of the pressure transducer is moved in the direction of the starting position.
  • the piston of the pressure transducer is returned step-by-step into the starting position. The preparation of the next pressing operation leaves enough time for this.
  • a new method is used which works with maximum pressure air from the hydraulic reservoir in order to obtain a peak operation with maximum pressure and a long press stroke, and to be able to forge, in the swage, titanium and similar metals, with a high deformation resistance, and to do it at a high deformation rate.
  • a further object of the invention is to provide a system for supplying high pressure to moving parts such as a forging press which includes at least one storage tank for storing gas at high pressure and a transducer having a primary part which is connected to the storage tank during the operation and a secondary part which is connected to the cylinder to be supplied with the gas at high pressure and wherein there is advantageously pro vided a second transducer for the return stroke of the primary transducer which has a secondary side which is in communication, during the forward stroke, with the secondary side of the first pressure transducer and which is fed from an air vessel while the primary side is in communication with the high pressure storage tank.
  • a further object of the invention is to provide a pressure operating system which is simple in design, rugged in construction, and economical to manufacture.
  • FIGURE of the drawing is a schematic view of a pressure system for use with a forging press constructed in accordance with the invention.
  • the invention embodied therein includes a high pressure pump 1, which receives liquid from a high level tank 3, which is fed through a conduit 2 and which may be oil, water or any other working fluid.
  • the pump 1 discharges through line 7 into a high pressure storage tank or reservoir 4, which is provided with a maximum-minimum control of any known kind.
  • the vessels and 6 form the gas chamber of the storage unit and are, like the vessel 4, under high pressure of about 300 excess atmospheres.
  • the gas chamber formed by the top of the vessel 4 and by the vessels 5 and 6 is in communication through the line 8 with a primary cylinder 10 of a first pressure transducer 11.
  • the first pressure transducer 11 includes a piston having a primary part 13, which is slidable in primary cylinder 10, and a second part 14, which is slidable in a secondary cylinder 12.
  • the secondary cylinder 12 is in communication through lines 15 and 18 and valve 16 with the working cylinder 19 of a forging press.
  • the valve 16 is actuated by a movable ram 17.
  • a working piston 20 of the forging press is slidable in the cylinder 19.
  • the method of operation of the press is as follows:
  • cylinder 19 is filled with a low pressure fluid from the liquid air vessel 38, which connects thereto through the lines 21 and 18 and a fillup valve 24.
  • pressure fluid is conducted through control valve 23 in lines 7, 26 and 18 from the reservoir 4 into the working cylinder 19. The metal is then rough-pressed.
  • valve 16 When the rough-pressing stroke is completed, valve 16 is opened by moving a control member 17 which is connected thereto and the maximum pressure for example, a pressure of 700 to 800 excess atmospheres is conducted from secondary cylinder 12 of pressure transducer 11 into working cylinder 19.
  • the maximum pressure fluid can flow through the short lines 15 and 18 which have a large cross-section for delivery of the pressure fluid in a quantity corresponding to the required high working speed of the press.
  • control valve 22 is opened by an operating control which is schematically indicated so that cylinder chamber 19 expands into lines 18 and 21 to the liquid air vessel 38.
  • piston 20 is retracted, with a retraction device of the press (not represented), and the working fluid is expelled, after fillup valve 24 has been opened by control 24a, through lines 18 and 21 into the liquid air vessel 38.
  • the return of the piston in pressure transducer 11 is effected by the back-pressure transducer 30, which acts like a pump. Its offset piston protrudes with its primary part 33 into primary cylinder 31, and, with its secondary part 34, into secondary cylinder 32.
  • control valve 28 opens, pressure fluid flows from high pressure reservoirs 4, 5 and 6 into lines 7, 26 and 27 and into the primary cylinder 31 to drive the piston portion 33 forward, which in turn moves portion 34 to force fluid at maximum pressure from secondary cylinder 32 through the open outlet valve 35 over and line 39 into secondary cylinder 12 of pressure transducer 11. Piston portions 13 and 14 of pressure transducer 11 are moved back. After the stroke of piston 33, 34 of backpressure transducer 30 is completed, control valve 28 is closed as controlled by pressure conditions and control valve 29 remains opened.
  • Primary cylinder 31 is thus in communication with high-level tank 3.
  • Fluid for example, of 5 excess atmospheres, flows from liquid-air vessel 38 through line 37 and the open inlet valve 36 into secondary cylinder 32 to exert pressure on the piston 34, 33 which, in turn, expels fluid from primary cylinder 31 due to movement of primary piston portion 33.
  • the fluid moves through lines 27, 2a into the high-level tank.
  • the reciprocal movement of piston l3, 14 is repeated until piston portions 13 and 14 have reached their starting position for the next working stroke of the press.
  • a method of producing a high hydraulic operating pressure for rapidly moving press plungers of forging presses of the type having a pressure transducer with a primary side, supplied with fluid under pressure during a working stroke of the press plunger, and a high pressure secondary side communicating with the press cylinder comprising storing hydraulic fluid under high gas pressure in a storage tank; during an initial portion of the working stroke of the press plunger, supplying the press cylinder with hydraulic fluid from the storage tank to subject the press plunger to the pressure of the hydraulic fluid in the storage tank; and then supplying gas under pressure from the storage tank to the primary side of the pressure transducer to effect a rapid increase in the pressure in the press cylinder to effect a correspondingly rapid movement of the press plunger.
  • a method for producing a high hydraulic pressure according to claim 1, wherein the primary side of the pressure transducer is held constantly under the high gas pressure of the storage tank during the operation of the transducer.
  • the improvement claimed in claim 1 including storing hydraulic fluid under high gas pressure in a second storage tank; and, in advance of the working stroke of the press plunger, filling the press cylinder with hydraulic fluid from the second storage tank.
  • the improvement claimed in claim 3 including providing a back pressure transducer with a primary side arranged for connection to the first storage tank and a secondary side arranged for connection to the secondary side of the first-mentioned pressure transducer and to the second storage tank; and, following the working stroke of the press plunger, supplying the primary side of the back pressure transducer with hydraulic fluid from the first storage tank to supply bydraulic fluid under pressure from the secondary side of the back pressure transducer to the secondary side of the first-mentioned transducer to restore the firstmentioned transducer to its starting position.
  • apparatus for producing a high hydraulic operating pressure for rapidly moving press plungers of forging presses of the type having a pressure transducer with a primary side, supplied with fluid under pressure during a working stroke of the press plunger, and a high pressure secondary side communicating with the press cylinder the improvement comprising, in combination, storage tank means storing hydraulic fluid under high gas pressure; first conduit means connecting the hydraulic fluid space of said storage tank means to said press cylinder to subject the press plunger to the pressure of the hydraulic fluid in the storage tank during a working stroke of said press plunger; and second conduit means connecting the gas space of said storage tank means to the primary side of said pressure transducer to effect a rapid increase in the pressure in said press cylinder to effect a correspondingly rapid movement of said press plunger during its working stroke.
  • said storagetank means comprises at least one pressure tank containing hydraulic fluid and gas under high pressure; and pump means operable to maintain the pressure in said pressure tank.
  • the improvement claimed in claim 5 including pump means connected to the hydraulic fluid space of said storage tank means and to the secondary side of said pressure transducer; said pump means being operable, upon completion of the working stroke of said press plunger, to supply hydraulic fluid under pressure to the secondary side of said pressure transducer to restore said pressure transducer to its starting position.
  • said pump means comprises a back pressure transducer with a primary side and a secondary side; a second storage tank containing hydraulic fluid under gas pressure; means operable, during a working stroke of said back pressure transducer, to connect the primary side thereof to the hydraulic fluid space of said storage tank means and to connect the secondary side thereof to the secondary side of said first-mentioned pressure transducer; and means operable, during a return stroke of said back pressure transducer, to connect the secondary side thereof to the hydraulic fluid space of said second storage tank and to connect the primary side thereof to a hydraulic fluid return line.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Presses (AREA)
  • Forging (AREA)
  • Press Drives And Press Lines (AREA)
US00111182A 1970-03-19 1971-02-01 Method and apparatus for producing high hydraulic pressure, particularly for operating a forging press Expired - Lifetime US3732691A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702013120 DE2013120C (de) 1970-03-19 Anlage zur Erzeugung höchster hyraulischer Drücke für Pressen

Publications (1)

Publication Number Publication Date
US3732691A true US3732691A (en) 1973-05-15

Family

ID=5765580

Family Applications (1)

Application Number Title Priority Date Filing Date
US00111182A Expired - Lifetime US3732691A (en) 1970-03-19 1971-02-01 Method and apparatus for producing high hydraulic pressure, particularly for operating a forging press

Country Status (2)

Country Link
US (1) US3732691A (ref)
JP (1) JPS528553B1 (ref)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5526644A (en) * 1995-06-07 1996-06-18 Brieschke; Todd M. Oil intensifier cylinder
WO1999064760A1 (en) * 1998-06-12 1999-12-16 Lisniansky, Robert, M. Regenerative adaptive fluid motor control
WO1999064761A1 (en) * 1998-06-12 1999-12-16 Lisniansky Robert M Regenerative adaptive fluid control
CN108708889A (zh) * 2018-07-23 2018-10-26 武汉理工大学 一种节能型低振快响应混合控制伺服液压机液压系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1966421A (en) * 1932-10-15 1934-07-10 Towler John Maurice Hydraulic system
US2032185A (en) * 1934-04-20 1936-02-25 Sciaky David Transmission system for a pressureoperated member such as a hydraulic press
US3145627A (en) * 1960-10-26 1964-08-25 Schlatter Ag Control apparatus for welding machines and the like

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1966421A (en) * 1932-10-15 1934-07-10 Towler John Maurice Hydraulic system
US2032185A (en) * 1934-04-20 1936-02-25 Sciaky David Transmission system for a pressureoperated member such as a hydraulic press
US3145627A (en) * 1960-10-26 1964-08-25 Schlatter Ag Control apparatus for welding machines and the like

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5526644A (en) * 1995-06-07 1996-06-18 Brieschke; Todd M. Oil intensifier cylinder
WO1999064760A1 (en) * 1998-06-12 1999-12-16 Lisniansky, Robert, M. Regenerative adaptive fluid motor control
WO1999064761A1 (en) * 1998-06-12 1999-12-16 Lisniansky Robert M Regenerative adaptive fluid control
CN108708889A (zh) * 2018-07-23 2018-10-26 武汉理工大学 一种节能型低振快响应混合控制伺服液压机液压系统

Also Published As

Publication number Publication date
DE2013120A1 (de) 1971-09-30
JPS528553B1 (ref) 1977-03-10

Similar Documents

Publication Publication Date Title
US3910087A (en) Hydraulic-forming machine
US3707866A (en) Machines for forming a workpiece between two ram heads
US6493913B2 (en) Device for hydraulic high pressure forming of a tubular component or a blank
US4048840A (en) Apparatus for producing an instantaneous pressure on a workpiece
US3945206A (en) Control system for hydraulic presses comprising a plurality of press rams
US3412554A (en) Device for building up high pulse liquid pressures
US3732691A (en) Method and apparatus for producing high hydraulic pressure, particularly for operating a forging press
US3143007A (en) Hydraulic assist for press
US3157111A (en) Work ejector for presses
US2357632A (en) Hydraulic press
US2343177A (en) Hydraulic press
US3357227A (en) Hydraulic press
USRE27244E (en) Device for building up high pulse liquid pressures
US2229965A (en) Hydraulic press circuit
US2766586A (en) Control valves for hydraulic presses
US3043425A (en) Extrusion press and control therefor
US3193875A (en) Extrusion press
EP0473797A1 (en) Device for hydro-mechanical forming of articles
US1150394A (en) Press for making tubes.
GB1207785A (en) Improvements in or relating to counter-blow hammers
US2252881A (en) Blank holder circuit with automatic release of blank holder pressure on idle stroke
GB1429226A (en) Drawing apparatus for sheet metal working
US2394636A (en) Progressive drawing press
US2201443A (en) Auxiliary hydraulic device for presses
US2805445A (en) Extrusion press closure