US3888168A - Hydraulic apparatus and control for a press - Google Patents
Hydraulic apparatus and control for a press Download PDFInfo
- Publication number
- US3888168A US3888168A US367051A US36705173A US3888168A US 3888168 A US3888168 A US 3888168A US 367051 A US367051 A US 367051A US 36705173 A US36705173 A US 36705173A US 3888168 A US3888168 A US 3888168A
- Authority
- US
- United States
- Prior art keywords
- piston cylinder
- ram
- speed
- pressure system
- cylinder assemblies
- 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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Classifications
-
- 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
- B30B15/18—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram
- B30B15/20—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram controlling the speed of the ram, e.g. the speed of the approach, pressing or return strokes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/869—Means to drive or to guide tool
- Y10T83/8821—With simple rectilinear reciprocating motion only
- Y10T83/8827—Means to vary force on, or speed of, tool during stroke
Definitions
- HYDRAULIC APPARATUS AND CONTROL FOR A PRESS Hydraulic presses are presently employed in performing work where the press ram or rams have a relatively long working stroke or strokes and wherein the speed of the ram or rams during the stroke is substantially reduced due to the increased resistance offered by the workpiece, for example, due to the increased density of the workpiece due to its being compressed by the ram or rams, in such applications, there is a great need and interest in conserving the power and time to perform the total pressing operation.
- the present invention provides a single group or multi-group of piston cylinder assemblies associated with a working ram of a press and a control means for said piston cylinder assemblies including means sensitive to a change in the speed of the ram and a means for changing the working force of a piston cylinder assembly or a number of the piston cylinder assemblies of a single group or two or more groups of cylinder assemblies with reference to the detected change in the speed of the ram.
- the low pressure system takes the form of a prefill pressure system
- the speed measuring means includes a transducer
- the cylinder selector means includes a limit switchspeed switch arrangement.
- FIG. 1 is a schematic elevational view, partly in section, of a hydraulic press, and particularly, of the piston cylinder assembly arrangement and hydraulic systems thereof constructed in accordance with the present in vention,
- FIG. 2 is an electrical diagram of part of the speed and power control system for the piston cylinder assembly arrangement shown in FIG. 1.
- FIG. 1 there is shown the upper portion of a piston cylinder arrangement of a compacting press of which the main crosshead is fragmentally shown connected to the upper portion of a vertically arranged ram 12 of the press.
- the piston cylinder assembly arrangement of the press is shown since it forms an important part of the invention. It consists first of a centrally located main piston cylinder assembly 14, the ram 16 of which engages the top of the crosshead l0. Outward of the main cylinder assembly 14 there are three equally spaced similar auxiliary piston cylinder assemblies 18, 20, and 22, their rams 24 also engaging the upper surface of the crosshead l0. Lastly, intermediate the main and auxiliary cylinders there are located a pair of pull back piston cylinder assemblies 25 and 26 for the crosshead 10.
- the main piston cylinder assembly 14 and the three auxiliary piston cylinder assemblies 18, 20 and 22 may be considered in function and operation as separate groups of cylinders in which the two groups are associated in common with two different hydraulic power systems, one being a low pressure or prefill system and the other a substantially higher pressure system.
- the main piston cylinder assembly 14 has associated with it a prefill valve 30 whereas the auxiliary piston cylinder assemblies are associated with their own prefill valve 32. Both of these valves 30 and 32 are connected to a prefill system by standards 34 and 36, respectively.
- the standards communicate with an anti-surge device 38 which in turn receives water under a prefill pressure from a prefill vessel, not shown. all in accordance with well-known practice.
- the prefill valves 30 and 32 which are similar in construction, operate in accordance with well-known valve technology, have center spools 40 actuated by operating stems 42 and high pressure orifices 44 for allowing water under the high pressure to pass into cylinder orifices 46 when the spools 40 are moved to the left as one views FIG. 1.
- piping 48 of the high pressure system which includes a main control directional valve 50.
- the high pressure water for the valve 32 is received by piping 52 from an auxiliary control directional valve 54.
- a third directional control valve 56 is shown, this valve by piping 58 communicates with the pull back cylinders 26.
- the directional valves 50, 54 and 56 receive the high pressure fluid from an accumulator and pump arrangement, such as several direct flow type pumps, not shown. It may be well to note that the pumps and accumulator will have a working pressure capacity of order of 4,500 psi, whereas the prefill supply system has a working pressure of 300 psi. It will be appreciated that while they have not been referred to specifically, the two hydraulic systems will include valves, strainers, gauges, etc., that customarily are employed in heavy industrial hydraulic applications.
- the electrical circuitry of the control includes two power lines 64 and 69 connected together by a switch 68 in a line 70 which line also includes a relay lCR.
- a line 72 is connected to the line 70 which allows current to pass through three secondary lines 74, 76 and 78 arranged in parallel.
- the line 74 includes the limit switch LS-l, a zero speed switch contact 80 and a relay 4CR.
- Line 76 includes the limit switch LS-2, a contact of the relay 4CR and a relay ZCR which is connected into the line 76 on the opposite sides of the contact 4CR.
- line 78 includes the limit switch LS-3, a second contact of the relay 4CR and a relay 3CR which is connected into the line 78 on opposite sides of the second contact 4CR.
- Also shown in P10. 2 is a speed measuring instrument for establishing the setting for the zero speed switch 80 at which setting the relay 4CR will be operated.
- the contact in line 76 of the relay 4CR will close activating the relay ZCR. This will cause the spool 40 of the prefill valve 32 to shift to open this valve to the high pressure system and admit high pressure fluid to the auxiliary piston cylinder assemblies 18, and 22 while the main piston cylinder assembly 14 is still under the prefill pressure.
- the contact of the relay 4CR in line 76 will remain closed until the speed of the ram has been increased to above the speed setting of the speed switch 80 after which it will be opened and the current in line 76 will pass through the contact 2CR which was closed on operation of the relay ZCR.
- the crosshead continues to descend under the reestablished optimum rate of speed and power the increased resistance offered by the workpiece due, for example, to its increased density, will again reduce the speed of the ram 12 and when its speed falls below the setting of the speed switch 80 and the crosshead has been lowered to trip the limit switch LS-3 the contact of the relay 4CR in line 78 is closed to activate relay 3CR.
- This will cause the spool 40 of the prefil] valve to shift to close off the prefill system from the main piston cylinder assembly 14 and open this piston cylinder assembly to the high pressure system so that all fourbeen again re-established the contact 4CR in line 78 will open and the current in line 78 will pass through the contact 3CR which was closed on operation of the relay 3CR.
- the limit switches LS-l, LS-2 and LS-3 are strategically spaced so as to conserve the available power and time, in which once the limit switch LS-3 has been tripped, the ram 12 will be approaching the conclusion of its downward stroke.
- a speed measuring means associated with said ram to measure its speed during its working stroke
- a piston cylinder assembly selector means associated with said speed measuring means arranged to first effect a connecting of said low pressure system to at least one of said piston cylinder assemblies, and then to effect a connecting of said high pressure system to at least said other piston cylinder assembly thereby to control the speed of said ram and offset a reduction in the speed of the ram due to in creased resistance during its working stroke.
- a speed measuring means associated with said ram to measure its speed during its working stroke
- a piston cylinder assembly selector means associated with said speed measuring means including means for first effecting a connecting of said low pressure system to all of said piston cylinder assemblies and means for then effecting a connecting of said high pressure system to at least some of said piston cylinder assemblies.
- said low pressure system takes the form of a prefill pressure system and wherein said speed measuring means includes a transducer means and said piston cylinder assembly selector means includes a limit switch-speed switch arrangement.
- transducer means includes a rack displaceable by said ram of said press
- a pinion arranged to mesh with said rack and connected to said transducer means.
- said selector means includes a series of limit switches arranged in a spaced linear relationship with respect to the direction of travel of said ram adapted to be sequentially engaged by said ram during its working stroke
- said speed switch being associated with said limit switch adapted to be first engaged by said ram during its working stroke so that when engaged said speed switch is operative.
- said first piston cylinder assembly comprises a main piston cylinder assembly and said second piston cylinder assembly comprising one or more auxiliary piston cylinder assemblies,
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Presses (AREA)
Abstract
Description
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US367051A US3888168A (en) | 1973-06-04 | 1973-06-04 | Hydraulic apparatus and control for a press |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US367051A US3888168A (en) | 1973-06-04 | 1973-06-04 | Hydraulic apparatus and control for a press |
Publications (1)
Publication Number | Publication Date |
---|---|
US3888168A true US3888168A (en) | 1975-06-10 |
Family
ID=23445737
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US367051A Expired - Lifetime US3888168A (en) | 1973-06-04 | 1973-06-04 | Hydraulic apparatus and control for a press |
Country Status (1)
Country | Link |
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US (1) | US3888168A (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3974764A (en) * | 1974-04-12 | 1976-08-17 | Horton Jr Edward L | Exhaust valve |
US4116122A (en) * | 1976-10-11 | 1978-09-26 | Osterwalder Ag | Hydraulic driven press |
US4150616A (en) * | 1977-06-28 | 1979-04-24 | L. Schuler Gmbh | Method of controlling the speed of a mechanical press |
US4196084A (en) * | 1976-09-21 | 1980-04-01 | Eberhard Hoesch & Sohne Gmbh & Co. | Plate filter press |
US4356763A (en) * | 1980-06-30 | 1982-11-02 | Aktiebolaget Karlstads Mekaniska Werkstad | Control arrangements for hydraulically-operated wood particle or fiber board press |
WO1987005858A1 (en) * | 1986-03-24 | 1987-10-08 | Mosley Machinery Company, Inc. | Method and apparatus for compacting low density articles |
WO1990009882A1 (en) * | 1989-03-03 | 1990-09-07 | Capps David F | Control apparatus and method for progressive fracture of workpieces |
US5176054A (en) * | 1989-03-03 | 1993-01-05 | Capps David F | Control apparatus and method for progressive fracture of workpieces |
US5913956A (en) * | 1995-06-07 | 1999-06-22 | Capps; David F. | Apparatus and method for progressive fracture of work pieces in mechanical presses |
US20170312810A1 (en) * | 2014-11-03 | 2017-11-02 | Japan Aeroforge, Ltd. | Hydraulic forging press and method for controlling same |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1907083A (en) * | 1932-04-16 | 1933-05-02 | Haskelite Mfg Corp | Power press |
US3044389A (en) * | 1960-06-14 | 1962-07-17 | Koehring Co | Press control mechanism |
US3081659A (en) * | 1958-11-24 | 1963-03-19 | Siemag Siegener Masch Bau | Hydraulic system providing successive application of force to shear means |
US3138976A (en) * | 1958-12-27 | 1964-06-30 | Schloemann Ag | Hydraulic forging presses |
US3242533A (en) * | 1964-04-16 | 1966-03-29 | Wintriss George | Safety control for hydraulic mold machine with low pressure closing |
US3416433A (en) * | 1967-03-01 | 1968-12-17 | Gutnikov Eduard Julievich | Hydraulic press plunger travel speed governing device |
-
1973
- 1973-06-04 US US367051A patent/US3888168A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1907083A (en) * | 1932-04-16 | 1933-05-02 | Haskelite Mfg Corp | Power press |
US3081659A (en) * | 1958-11-24 | 1963-03-19 | Siemag Siegener Masch Bau | Hydraulic system providing successive application of force to shear means |
US3138976A (en) * | 1958-12-27 | 1964-06-30 | Schloemann Ag | Hydraulic forging presses |
US3044389A (en) * | 1960-06-14 | 1962-07-17 | Koehring Co | Press control mechanism |
US3242533A (en) * | 1964-04-16 | 1966-03-29 | Wintriss George | Safety control for hydraulic mold machine with low pressure closing |
US3416433A (en) * | 1967-03-01 | 1968-12-17 | Gutnikov Eduard Julievich | Hydraulic press plunger travel speed governing device |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3974764A (en) * | 1974-04-12 | 1976-08-17 | Horton Jr Edward L | Exhaust valve |
US4196084A (en) * | 1976-09-21 | 1980-04-01 | Eberhard Hoesch & Sohne Gmbh & Co. | Plate filter press |
US4116122A (en) * | 1976-10-11 | 1978-09-26 | Osterwalder Ag | Hydraulic driven press |
US4150616A (en) * | 1977-06-28 | 1979-04-24 | L. Schuler Gmbh | Method of controlling the speed of a mechanical press |
US4356763A (en) * | 1980-06-30 | 1982-11-02 | Aktiebolaget Karlstads Mekaniska Werkstad | Control arrangements for hydraulically-operated wood particle or fiber board press |
WO1987005858A1 (en) * | 1986-03-24 | 1987-10-08 | Mosley Machinery Company, Inc. | Method and apparatus for compacting low density articles |
WO1990009882A1 (en) * | 1989-03-03 | 1990-09-07 | Capps David F | Control apparatus and method for progressive fracture of workpieces |
US5042336A (en) * | 1989-03-03 | 1991-08-27 | Capps David F | Control apparatus and method for progressive fracture of workpieces |
US5176054A (en) * | 1989-03-03 | 1993-01-05 | Capps David F | Control apparatus and method for progressive fracture of workpieces |
US5913956A (en) * | 1995-06-07 | 1999-06-22 | Capps; David F. | Apparatus and method for progressive fracture of work pieces in mechanical presses |
US20170312810A1 (en) * | 2014-11-03 | 2017-11-02 | Japan Aeroforge, Ltd. | Hydraulic forging press and method for controlling same |
US10786847B2 (en) * | 2014-11-03 | 2020-09-29 | Japan Aeroforge, Ltd. | Hydraulic forging press and method for controlling same |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: PITTSBURGH NATIONAL BANK Free format text: SECURITY INTEREST;ASSIGNOR:WEAN UNITED, INC., A CORP.OF OH;REEL/FRAME:004458/0765 Effective date: 19850610 |
|
AS | Assignment |
Owner name: PITTSBURGH NATIONAL BANK Free format text: SECURITY INTEREST;ASSIGNOR:WEAN UNITED, INC., A CORP. OH.;REEL/FRAME:004792/0307 Effective date: 19860630 Owner name: PITTSBURGH NATIONAL BANK,PENNSYLVANIA Free format text: SECURITY INTEREST;ASSIGNOR:WEAN UNITED, INC., A CORP. OH.;REEL/FRAME:004792/0307 Effective date: 19860630 |
|
AS | Assignment |
Owner name: PITTSBURGH NATIONAL BANK Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:WEAN UNITED INC./NOW WEAN INCORPORATED PA CORP.;REEL/FRAME:005004/0152 Effective date: 19881013 |
|
AS | Assignment |
Owner name: MITSUI ENGINEERING & SHIPBUILDING CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WEAN INCORPORATED, A CORP. OF PA.;REEL/FRAME:005208/0359 Effective date: 19890803 Owner name: WEAN INCORPORATED, A CORP. OF PA., PENNSYLVANIA Free format text: MERGER;ASSIGNOR:WEAN UNITED, INC., A CORP. OF OHIO;REEL/FRAME:005208/0358 Effective date: 19890804 |