US3244051A - Pierce unit hydraulic control - Google Patents

Pierce unit hydraulic control Download PDF

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Publication number
US3244051A
US3244051A US341503A US34150364A US3244051A US 3244051 A US3244051 A US 3244051A US 341503 A US341503 A US 341503A US 34150364 A US34150364 A US 34150364A US 3244051 A US3244051 A US 3244051A
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United States
Prior art keywords
pressure
cylinder
tank
booster
piston
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
US341503A
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English (en)
Inventor
Floyd M Williamson
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.)
DI-DRO ENGINEERING Co
DRO ENGINEERING Co DI
Original Assignee
DRO ENGINEERING Co DI
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 DRO ENGINEERING Co DI filed Critical DRO ENGINEERING Co DI
Priority to US341503A priority Critical patent/US3244051A/en
Priority to DE19651502158 priority patent/DE1502158A1/de
Priority to FR3059A priority patent/FR1421965A/fr
Priority to GB4023/65A priority patent/GB1023369A/en
Application granted granted Critical
Publication of US3244051A publication Critical patent/US3244051A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/002—Drive of the tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/22—Feeding members carrying tools or work
    • B23Q5/32—Feeding working-spindles
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q2705/00—Driving working spindles or feeding members carrying tools or work
    • B23Q2705/10—Feeding members carrying tools or work
    • B23Q2705/16—Feeding working spindles
    • B23Q2705/165—General aspects of feeding a boring spindle
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/216—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being pneumatic-to-hydraulic converters
    • 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
    • F15B2211/40—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
    • F15B2211/455—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
    • F15B2211/40—Flow control
    • F15B2211/465—Flow control with pressure compensation
    • 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
    • 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
    • Y10T83/8776—Constantly urged tool or tool support [e.g., spring biased]
    • Y10T83/8785—Through return [noncutting] stroke
    • 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
    • Y10T83/8788—Tool return mechanism separate from tool advance mechanism
    • 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
    • Y10T83/8858—Fluid pressure actuated

Definitions

  • the present invention has reference to certain new and useful improvements in hydraulic piercing systems whereby the tool of the pierce unit may be hydraulically and rapidly actuated in both directions and wherein the pressure applied in moving such tool in one direction is independent of that applied for moving it in its other direction.
  • the present invention also provides a system which is very flexible whereby it may be readily adapted to meet a wide variety of conditions.
  • a principal object of the invention is to provide a new and improved pierce unit hydraulic control.
  • FIGURE 1 is a schematic view of a pierce unit hydraulic control system embodying the invention, with certain parts shown in section;
  • FIGURE 2 is an enlarged sectional view of the pierce unit per se.
  • FIGURE 3 is a view similar to FIGURE 1 of a modified system.
  • the system in general comprises a pierce unit 10, a valve 12, a tank of hydraulic fluid i4, and a booster unit 16 interconnected in a hydraulic circuit for supplying hydraulic fluid under pressure to the pierce unit for advancing the tool thereof.
  • the system of FIGURE 1 further includes another valve 20, a tank of hydraulic fluid 22, and a booster unit 24 which are interconnected in the hydraulic circuit for supplying hydraulic fluid under pressure to the pierce unit for retracting the tool thereof.
  • the tanks should be mounted at an elevation above the pierce units and the boosters.
  • the pierce unit preferably comprises the construction illustrated in FIGURE 2.
  • a cycling valve 26 is associated with the booster 16 for regulating the supply of compressed air thereto for energizing the booster l6, and
  • cycling valve 28 is associated with the booster 24, the cycling valves 26 and 28 being arranged to be alternately actuated for effecting the feed and retraction of the tool of the pierce unit.
  • the pierce unit comprises a cylinder 40 provided at one end with a guide 42, the
  • a shaft seal cage 79 is secured within the cylinder bore 52 adjacent the guide 42 and is provided with an annular sealing ring 72 for cooperation with the cylinder bore 52 and an annular seal '74 for sealing engagement with the shank 5i) of the tool holder 46.
  • the cage 76 is suitably anchored in the position illustrated and along with the guide 42 serves to slidably support the tool holder 46.
  • a stop collar 76 is seated within the bore 52 adjacent the cage 70 and is provided with an aperture for accommodating the shank 50 of the tool holder.
  • a coil spring 73 is confined between the collar 76 and a washer 80 which abuts the forward face of the piston 54 and serves to bias the piston 54 and the tool holder 46 afiixed thereto to their retracted position.
  • a hydraulic fluid pressure line 82 is connected to the cylinder 46 and communicates with a passage 84 whereby hydraulic fluid under pressure may be supplied to the cylinder bore 52 to react on the piston 54 for returning it to its retracted position.
  • a washer 86 is confined by and between the cap 48 and the guide 42 and includes an integral lzey 88 which projects into a longitudinally extending groove 90 in the enlarged portion 44 so as to prevent rotation thereof.
  • the tool holder 46 includes a socket 1% in which the shank of the tool 94 is seated and retained by a setscrew 102 which is threadedly positioned in a tapped hole in the tool holder 46 whereby the tool 94 may be secured in the socket and removed therefrom.
  • a stripping nose 104 is slidably secured on the end of the tool holder 46 and biased to its extended position by a spring 106 which is confined between the tool holder 46 and the inside end of the nose 104.
  • the length of the stroke of the tool 94 is determined by the distance between the piston 54 and the collar 76, and where different travel is required a cage 76 or collar 76 of different axial length than the one illustrated may be employed.
  • the collar 76 backed up by the cage 76 thus forms a stop for limiting the feed stroke of the tool 94 under the hydraulic fluid pressure applied to the back face of the piston by fluid introduced into the cylinder 52 through the port 62.
  • the spring 78 and hydraulic fiuid under tank pressure supplied to the cylinder bore 52 through the fluid line 82 react on the piston 54 for retracting it and the tool 94 with a force considerably in excess of the tank pressure normally applied through line 60 so that the tool 94 is normally retracted.
  • the tank 14 is supplied with hydraulic fluid under pressure, say for example -40 lbs. per square inch (preferably about one-half the air pressure supplied to tank 22), through the air pressure line 110, and the pressure, in the tank is maintained and regulated by the valve 112.
  • the tank contains a quantity of hydraulic fluid under such pressure which is supplied to the booster 16 and to the cylinder 52 of the pierce unit 19 for eflecting the feed stroke of the tool. 94.
  • the tank '14 is connected by hydraulic fluid pressure line 116 to a passage 118 in the valve 12.
  • the passage 126 communicating at one end with the passage-118 communicates with a a passage 122 past a check valve 124, the check 'valve serving to permit hydraulic fluid flow from the passage 120 into the passage 122, but'not in the reverse direction.
  • the passage 126 in the valve 12 interconnects the passage 122 and. a hydraulic fluid pressure line 128 whichleads to the hydraulic fluid cylinder (not shown in detail) of the booster 16.
  • the booster 16 may be of
  • I air' cylinder of the booster 16 may haveia-diameter'tefi. times that 'of the hydraulic cylinder, with the result that when the beoster16; is energizedgthe. hydraulic fluid dischargedtrom' the hydraulic fluid'cylinder will be discharged under apressure ten times that of the air'pres sure applied to the air cylinder of the booster, and'if such air pressureis 100 lbs. per square inch, the booster Will discharge hydraulic fluid lbs. per square inch. 7 V
  • the hydraulic cylinder of the booster is charged with hydraulic fluid from the tank 14 when the booster is under a pressure or" 1000 deenergized, the pressure on the hydraulic fluid in the tank serving-to recharge the hydraulic cylinder of the booster andto retract the air piston thereof.
  • the supply of air under pressure to the booster 16 is controlled 7 'by the cycling valve 26 which is adapted when actuated to openthe airpres'sure line 111 thus permittingthe apr I plication of air pressure to the air cylinder of the booster '16 for :energizing the booster.
  • the passage 118 in the valve 12 communicates through 'a normally open; valve 130 with passage 134 which is 016.; Upon the. deenergization of'the' booster 16 the I in open' communication with the oil line leading to the cylinder bore of the pierce unit 10 so that oil under 1 .tank pressure is supplied to the cylinder bore 52'through the passage 62, but the tank pressure on such oil is inadequate to move the piston 54 against, the resistance 0f the spring 78 and the hydraulic pressure supplied" through line 82.
  • The'valve 130 comprises a sleeve 136 seatedin valve chamber 138 and a piston type valve 140 which is slidable within the sleeve, 136 and biased
  • the hydraulic fluid discharged thereby reactson the piston valve'member 140 to shift the same so as to uncover the ports 146v whereby the hydraulic fluid discharged by the booster is supplied through passages 144, 132, 134 and line 60 t0 the cylinder bore 52 of the pierce unit 10 for eflecting the feed stroke of the pierce unit.
  • the shifting of the piston valve member 140 in' response to the discharge tion or return stroke of the tool 94 of the pierce unit.
  • the cycling valve 28 preferably is actuated in response to the completion of the feed stroke of the tool 94; that is,'a sensing device responsive to the completion of'the feed stroke of the tool 94 'maybe employed to actuate '(i.e., open) the cycling valve.28 so as to energize the booster -24. as soon as the feed stroke of the tool 94 is completed so as to effect'the immediate retraction and stripping stroke of'thc' tool 94.
  • the cycling valve 28 is the same type as the cycling valve 26, the'booster 24 7 is of the same construction as the booster 16, the tank '22 is of the same jconstruction'as the tank 14, and the valve 20 is of the same construction as the valve 12; and the tank 22,,valve 2d, and booster 24 are hooked up in a hydraulic circuit in the same way as the corresponding elements 12, 14 and 16 and will function in the same way.
  • the pressure maintained in thetank 22 preferably is higher and adjusted independently of the pressure in the tank 14, and the booster 24 may be larger or smaller than the booster 16 so that the pressure available on the feed stroke of the tool 94 may be greater or less than the pressure available for retracting the tool 94.
  • tank pressures on both of the circuits may be the same and a'common pressure tank may :be
  • the cycling valves'26 and 28'forthe boosters 16 and V 24 are normally, closed or inactive'so thatthe boosters 16 and 24 are normally deenergized'so that the system will normally be in the position as illustrated in FIG- URE 1.
  • the cycling valve 26 may be actuated in any suiable way, such for example as in response to'a sensing .and'power moved in bothdirections so as to makeit pos sibleto achieve rapid piercing of successive blanks.
  • the tool 94 maybe reciprocated with such rapidity that .to" the position illustrated by spring 142;
  • the valve chamber 138 intersects the passage 118 and also a pas sage 144 which communicates with one end of the passage 132.
  • the sleeve 136 is provided with ports which are in line with the passage 118 whereby in the position of the V valve .130 as shown, oil is free to flow through such ports into the interior of the sleeve 136- and thence into the passage 134.
  • the sleeve 136 is also provided with ports a 146 in "line with the passage 144, but such ports are normally closed by the piston valve 148 which seats on the end-of the chamber 138 and around a shoulder provided by a port 150 which communicates with the passage 122.
  • the means for tripping or actuating the cycling valve 28 may be removed or the circuit which includes the valve 20, booster 24, and tank 22 otherwise disabled whereby the spring 78 will be effective to retract the tool holder 46 and the tool 94 carried thereby.
  • the spring 78 is not required where hydraulic fluid pressure in tank 22 is adequate to retract the piston 54, but the spring does serve to locate the stop collar 76 adjacent the seal cage 70 and to compensate for the area differential on opposite sides of piston 54, and where hydraulic retraction pressures are adequate the spring 78 can be a very light spring. However, when the spring 78 alone is used for retraction, a much heavier spring is required.
  • the pierce unit and the hydraulic system for effecting the retraction thereof, including the valve 20, booster 24 and the feed tank 22 are the same as in FIGURE 1.
  • the system for effecting the feed stroke of the tool is actuated differently but operates in the same way as the system which includes the valve 12, the booster 16, and the pressure tank 14 of FIGURE 1.
  • the pressure tank 214 for the feed part of the system in FIGURE 3 may be the same as in FIGURE 1.
  • the valve 212 includes all of the mechanism of the valve 12 plus a pressure relief valve which is indicated at 215, and instead of using an air pressure operated booster such as 16 to supply the pressure required for effecting the feed stroke, such pressure is supplied by a booster cylinder 216 and piston 217 actuated by the ram 218 of a press, as shown in FIG. 1 of my Patent No. 3,089,375.
  • the cylinder 216 is supplied with hydraulic fluid pressure from the tank 214 through the fluid pressure line 228 which is connected to the valve 212, and the tank pressure normally biases the piston 217 to its upper position.
  • the piston 217 is moved so as to displace hydraulic fluid from the cylinder 216 which is supplied through the line 228 to the valve 212 and thence to the pierce unit 210 in a manner similar to that described in connection with the valve 12.
  • the parts of the valve 212 which correspond to the valve 12 are indicated by the same reference characters.
  • a pressure relief valve 215 is included in the valve 212 so as to dissipate excess pressure in the event that the feed stroke of the pierce unit is completed before the ram 218 reaches the bottom of its stroke.
  • the pressure relief valve essentially is of the construction illustrated in my patent Reissue 25,027.
  • the pressure relief valve 215 essentially provides a pressure relief by-pass between passage 122 on the high pressure side of the system and passage 118 on the low pressure side when the valve 130 is closed so as to prevent the generation of dangerous pressures on the high pressure side of the system.
  • the pressure relief valve of course may be adjusted so as to set the bleed-off pressure at any desirable pressure, and such pressure will then be the maximum pressure that can develop on the high pressure side of the system.
  • a hydraulically actuated pierce unit comprising a hydraulic cylinder having a piston reciprocable therein and a piercing tool connected to said piston so as to move therewith, a first hydraulic circuit connected to said cylinder on one side of said piston for supplying hydraulic fluid under pressure thereto for moving said piston in one direction, a second hydraulic circuit connected to said cylinder on the other side of said piston for supplying hydraulic fluid under pressure thereto for moving said piston in the opposite direction, each of said circuits including a tank of hydraulic fluid under regulated pressure and a hydraulic pressure booster connected in fluid flow and pressure transmitting relation to each other and to said cylinder so that said cylinder and said booster are supplied with hydraulic fluid under tank pressure, and a valve in the hydraulic connection between said cylinder and said tank which is arranged to close upon energization of said booster to prevent the transmission to said tank of pressure generated by the energization of said booster, said valve including a spring biased valve member normally positioned to provide fluid flow from said cylinder to said tank upon deenergization of said booster, the pressure
  • each of said circuits comprise a one-way fluid flow connection from said tank to said booster, a one-way fluid flow connection from said booster to said cylinder, and a two-way fluid flow connection between said cylinder and tank and wherein said valve is closed in response to hydraulic fluid discharged by said booster upon energization thereof.
  • a hydraulically actuated pierce unit comprising a hydraulic cylinder having a piston reciprocable therein and a piercing tool connected to said piston so as to move therewith, a first hydraulic circuit connected to said cylinder on one side of said piston for supplying hydraulic fluid under pressure thereto for moving said piston in one direction, a second hydraulic circuit connected to said cylinder on the other side of said piston for supplying hydraulic fluid under pressure thereto for moving said piston in the opposite direction, each of said circuits including a tank of hydraulic fluid under regulated pressure and a hydraulic pressure booster connected in fluid flow and pressure transmitting relation to each other and to said cylinder so that said cylinder and said booster are supplied with hydraulic fluid under tank pressure, and a valve in the hydraulic connection between said cylinder and said tank and booster which is operable upon energization of said booster to shut off the flow connection between said cylinder and said tank, said valve including a spring biased valve member normally positioned to provide open two-way fluid flow between said cylinder and tank when said booster is deenergized.
  • a hydraulically actuated pierce unit comprising a hydraulic cylinder having a piston reciprocable therein and a piercing tool connected to said piston so as to move therewith, a first hydraulic circuit connected to said cylinder on one side of said piston for supplying hydraulic fluid under pressure thereto for moving said piston in one direction, a second hydraulic circuit connected to said cylinder on the other side of said piston for supplying hydraulic fluid under pressure thereto for moving said piston in the opposite direction, each of said circuits including a tank of hydraulic fluid under regulated pressure and a hydraulic pressure booster connected in fluid flow and pressure transmitting relation to each other and to said cylinder so that said cylinder and said booster are supplied with hydraulic fluid under tank pressure, and a normally open valve in the hydraulic connection between said cylinder and said tank which is arranged to close in response to energization of said booster to shut off the fluid flow connection between said cylinder and said tank, said valve including a spring biased '2 valve member normally positionedzto provide :fluid flow from said cylinder to the tank when said booster is deenergize
  • said pierce unit includes a spring biasing said piston to its-retracted position whereby said piercing tool may be retracted by 8 said spring when the hydraulic circuit operable for retracting said tool is inefiective.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Press Drives And Press Lines (AREA)
  • Fluid-Pressure Circuits (AREA)
US341503A 1964-01-31 1964-01-31 Pierce unit hydraulic control Expired - Lifetime US3244051A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US341503A US3244051A (en) 1964-01-31 1964-01-31 Pierce unit hydraulic control
DE19651502158 DE1502158A1 (de) 1964-01-31 1965-01-14 Hydraulisch betaetigtes Stanzwerkzeug
FR3059A FR1421965A (fr) 1964-01-31 1965-01-22 Système hydraulique de percage
GB4023/65A GB1023369A (en) 1964-01-31 1965-01-29 Improvements in or relating to hydraulically actuated piercing tools

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US341503A US3244051A (en) 1964-01-31 1964-01-31 Pierce unit hydraulic control

Publications (1)

Publication Number Publication Date
US3244051A true US3244051A (en) 1966-04-05

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ID=23337853

Family Applications (1)

Application Number Title Priority Date Filing Date
US341503A Expired - Lifetime US3244051A (en) 1964-01-31 1964-01-31 Pierce unit hydraulic control

Country Status (4)

Country Link
US (1) US3244051A (fr)
DE (1) DE1502158A1 (fr)
FR (1) FR1421965A (fr)
GB (1) GB1023369A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5606910A (en) * 1993-04-26 1997-03-04 Danly Corporation Press-driven tool module in particular press-driven cross-punching or bending unit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9607055D0 (en) * 1996-04-03 1996-06-05 Moore William & Co Ltd Drive means

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5606910A (en) * 1993-04-26 1997-03-04 Danly Corporation Press-driven tool module in particular press-driven cross-punching or bending unit

Also Published As

Publication number Publication date
GB1023369A (en) 1966-03-23
FR1421965A (fr) 1965-12-17
DE1502158A1 (de) 1969-10-23

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