US3847074A - Power system for multi-pressure hydraulic press - Google Patents

Power system for multi-pressure hydraulic press Download PDF

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Publication number
US3847074A
US3847074A US00281389A US28138972A US3847074A US 3847074 A US3847074 A US 3847074A US 00281389 A US00281389 A US 00281389A US 28138972 A US28138972 A US 28138972A US 3847074 A US3847074 A US 3847074A
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US
United States
Prior art keywords
working faces
press
working
double
plunger
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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US00281389A
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English (en)
Inventor
E Nowak
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.)
PRZED DOSWIADCZALNE AUTOMAT TL
PRZEDSIEBIORSTWO DOSWIADCZALNE AUTOMAT TLOCZNIKOW PONAR HYDOMAT PO
Original Assignee
PRZED DOSWIADCZALNE AUTOMAT TL
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
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Publication of US3847074A publication Critical patent/US3847074A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/32—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure

Definitions

  • Each cylinder and plunger is of a different diameter; i.e., obtained are several different working faces of plungers, and several different displacement volumes.
  • a whole series of pressures and press operation frequencies can be obtained in a press under constant parameters of the hydraulic system, namely the pressure and the delivery of the pumped liquid, for selecting in the press the optimum pressures and operation frequencies required for a particular working process.
  • the subject of the present invention is a power system for a double-acting, multi-pressure hydraulic press.
  • the single or double-acting hydraulic presses used at the present time are fitted, in general, with single stage power pistons or plungers, namely with pistons or plungers having only a single working face.
  • the smaller face of a plunger gives a small displacement volume, this volume serving for a so-called priming of the cylinder namely for filling the cylinder with hydraulic liquid under a minimum pressure, and for a quick travel of the plunger to the working zone; on the larger face of the plunger, or on the sum of both faces of the plunger, acts, or on the other hand, the hydraulic liquid under a high pressure, thus allowing to obtain high technology pressures for the press, these high pressures being required for the working operation over a short distance of piston stroke in the working zone.
  • the fundamental drawback of power systems for hydraulic presses with a single-stage plunger is the necessity of using the pumps of a high delivery of the pumped hydraulic liquid, this high delivery being required for a quick travel of the plunger to the working zone in which, in turn, the travel of the plunger is several times smaller than the idle stroke, owing to the fact that the press performs then a working operation, and therefore the liquid demand becomes then considerably smaller.
  • the pump is delivering the constant in time quantities of liquid, and therefore the liquid surplus is forced, through a relief valve, to the tank, this resulting in well known disturbances in the hydraulic system.
  • the pumps of vari- 'able delivery and pressure were used, namely the pumps in which the quantity and the pressure of the pumped liquid are automatically suited to the speed of the plunger travel and to the resistance of its motion, i.e., to the technology pressures prevailing in the working zone of the press.
  • Such a solution was only partially successful for obviating the above-mentioned problems, and application of expensive pumps of variable delivery is unfavorably affecting the cost of the whole press.
  • the priming systems on the I other hand, including a low pressure tank are suitable only for the presses of a small operation frequency. Similar problem arises in the case of double-acting presses having two working zones: a top zone, and a bottom zone.
  • the economy aspects are prompting that during a working cycle the use is made of both these working zones or levels, while the technical factors allow that realized also can be-two different pressures depending on the type of produced element and on the type of operation in a given zone.
  • the purpose of the present invention is to obviate the above-mentioned inconveniences by developing a hydraulic power system for a double-acting press, this system allowing, under application of a constant delivery pump, to obtain various pressures in the press, and to alter its operation frequency within a possibly wide range.
  • the power system for a double-actingpress consists of plungers 1a and 1b, said plungers being'provided with several different working faces and operating in cylinders 2a and 2b, said cylinders being mounted on the top and bottom part of a press frame 3.
  • the bottoms of the said cylinders are attached, by means of bolts (not shown in the drawing) to the top and bottom part of the said frame.
  • Columns 4 slide in the frame 3, and a platen 5 is rigidly fixed to the said columns.
  • plates 6a and 6b which operate jointly with plungers 1a and 1b.
  • Bolted to the cylinders are ring gears 8a and 8b, said rings being meshed with worm screws 7a and 7b, said worm screws being the provision for adjusting the stroke of the said plungers.
  • the power system operates as follows:
  • the liquid is fed, for instance through the aperture 0, to the zone beneath the working face of plunger 1b, thus effecting a downward motion of an assembly consisting of plunger 11;, plate 6b, columns 4, platen 5, plate 6a, and plunger la, until the working operation, under the pressure of the press, takes place in the bottom working zone of the press, this pressure being the product of a given face area of the plunger and of the pressure of the liquid.
  • the distributing device directs the liquid, for instance through the aperture A, to the zone beneath the working face of plunger 1a, and the whole previously mentioned assembly moves upward, until in the top working zone of the press the working operation takes place under the pressure whose value is the effect of a given area of the plunger working face and of the liquid pressure which has a constant value.
  • a suitably programmed distributing device is arranged to control the flow of liquid to the zone beneath one, or simultaneously various, working faces of plungers 1a and 1b, thus causing various pressures of the press, and various frequencies of press operation to be obtained.
  • a double-acting hydraulic press having two pressing stations comprising, in combination:
  • a first plunger positioned in said first power cylinder, said first plunger having a first plurality of working faces to which hydraulic fluid may be independently applied;
  • a platen positioned between said two pressing stations and having a first and a second working surface
  • coupling means coupling said platen to said first plunger
  • a second plunger positioned in said second power cylinder, said second plunger having a second plurality of working faces to which hydraulic fluid may be independently applied;

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
US00281389A 1971-09-11 1972-08-17 Power system for multi-pressure hydraulic press Expired - Lifetime US3847074A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL15046371A PL70957B1 (xx) 1971-09-11 1971-09-11

Publications (1)

Publication Number Publication Date
US3847074A true US3847074A (en) 1974-11-12

Family

ID=19955583

Family Applications (1)

Application Number Title Priority Date Filing Date
US00281389A Expired - Lifetime US3847074A (en) 1971-09-11 1972-08-17 Power system for multi-pressure hydraulic press

Country Status (10)

Country Link
US (1) US3847074A (xx)
JP (1) JPS4836775A (xx)
CH (1) CH543956A (xx)
DD (1) DD98639A5 (xx)
DE (1) DE2244013A1 (xx)
FR (1) FR2149213A5 (xx)
GB (1) GB1396746A (xx)
IT (1) IT974923B (xx)
PL (1) PL70957B1 (xx)
SU (1) SU476743A3 (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100421919C (zh) * 2006-10-16 2008-10-01 江苏省徐州锻压机床厂 双点压力机对齿、校正、检验同步工装及应用工艺

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2702701C3 (de) * 1977-01-24 1982-01-28 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8000 München Anlage zur Gewinnung von Wasser aus feuchter Luft
JPS5442084A (en) * 1977-09-09 1979-04-03 Iwatani & Co Reciprocating molding press
JPS63195909U (xx) * 1987-06-04 1988-12-16
GB2363356B (en) * 2000-06-01 2002-07-10 Marc Gibson Collinson An arrangement for a double acting press
WO2003045677A1 (en) * 2001-11-20 2003-06-05 Marc Gibson-Collinson An arrangement for a double-acting press
CN109591359B (zh) * 2019-01-25 2021-05-11 安徽远都机床股份有限公司 一种闭式双点压力机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB411413A (en) * 1934-03-16 1934-06-07 Maurice Michael Eaton Improvement in hydraulic presses
US2288356A (en) * 1939-04-15 1942-06-30 Walter E Humphrey Press for vulcanizing play balls and similar articles
US2448277A (en) * 1945-02-01 1948-08-31 William S Renier Apparatus for forming and preheating slugs of moldable material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB411413A (en) * 1934-03-16 1934-06-07 Maurice Michael Eaton Improvement in hydraulic presses
US2288356A (en) * 1939-04-15 1942-06-30 Walter E Humphrey Press for vulcanizing play balls and similar articles
US2448277A (en) * 1945-02-01 1948-08-31 William S Renier Apparatus for forming and preheating slugs of moldable material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100421919C (zh) * 2006-10-16 2008-10-01 江苏省徐州锻压机床厂 双点压力机对齿、校正、检验同步工装及应用工艺

Also Published As

Publication number Publication date
DE2244013A1 (de) 1973-03-22
FR2149213A5 (xx) 1973-03-23
CH543956A (de) 1973-11-15
DD98639A5 (xx) 1973-07-05
JPS4836775A (xx) 1973-05-30
IT974923B (it) 1974-07-10
GB1396746A (en) 1975-06-04
SU476743A3 (ru) 1975-07-05
PL70957B1 (xx) 1974-04-30

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