US3875784A - Differential pressure device for folding apparatus - Google Patents

Differential pressure device for folding apparatus Download PDF

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Publication number
US3875784A
US3875784A US448037A US44803774A US3875784A US 3875784 A US3875784 A US 3875784A US 448037 A US448037 A US 448037A US 44803774 A US44803774 A US 44803774A US 3875784 A US3875784 A US 3875784A
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US
United States
Prior art keywords
punch
work sheet
anvil
cylinders
piston rods
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
US448037A
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English (en)
Inventor
Dennis Daniels
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.)
US Amada Ltd
Original Assignee
Amada Ltd Us
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 Amada Ltd Us filed Critical Amada Ltd Us
Priority to US448037A priority Critical patent/US3875784A/en
Priority to JP50026415A priority patent/JPS5240912B2/ja
Application granted granted Critical
Publication of US3875784A publication Critical patent/US3875784A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
    • B21D5/042—With a rotational movement of the bending blade

Definitions

  • ABSTRACT 2% 72/320: n/Dlb 72/313 A folding apparatus is provided with a pivotal folding l 7 4 2 punch that moves past a work sheet supporting sur- 8] held of 1: face and an anvil. Hydraulically powered piston and LIDIG' 8 cylinder mechanisms pull the anvil against the work sheet supporting surface while simultaneously pulling [56] f f (Med the punch about the anvil. Second hydraulic cylinder UNITED PATENTS and piston mechanisms provide a variable resistance 2.228.448 H194! Fatlur 72/3l9 force against the movement of the punch.
  • the invention employs hydraulically powered resistance means that oppose the force tending to pivot the punch about the anvil.
  • Control means are provided for varying the amount of the resistance force.
  • the resistance force is provided by a pair of hydraulic cylinder and piston mechanisms. the piston rods being operatively connected to the ends of the folding punch.
  • a variable pressure relief valve is in the hydraulic line discharging from the cylinder when the punch is being moved about the anvil so that. by varying the relief pressure. the amount of resistance is determined.
  • FIG. 1 is an isometric of a preferred folding machine embodying the principles of the invention.
  • FIG. 2 is a vertical section of the folding machine shown in FIG. 1.
  • FIG. 3 is a preferred hydraulic schematic embodying the principles of the invention.
  • the folding apparatus includes a base frame 10 having side frames 12 and 14 and a work piece supporting surface 18.
  • the work piece supporting surface is provided with adjustable stops 22 for moving a work sheet upwardly thereon.
  • An anvil 23 is fixed at either end to a pair of slides 24 that ride in guides 25 mounted on the side frames 12 and 14.
  • the anvil is movable upwardly a slight distance from the work piece supporting surface 18 so that a work sheet W can be moved beneath. The anvil can then be moved toward the supporting surface 18 to tightly clamp the work sheet during the folding operation.
  • Folding is accomplished by a pivotable punch 26 of the type described in my earlier application which is mounted to pivot about an axis 27.
  • the punch is simultaneously pivoted with additional clamping force being applied to the work sheet by a pair of hydraulic cylinders and pistons 30.
  • the cylinders are pivotally mounted by brackets 32 to the slides 24 which are coupled to the anvil 23.
  • the piston rods 34 are coupled by chains 36 to the end of the punch by studs 38.
  • retraction of the piston rods into the cylinders 30 first pulls the anvil 23 downwardly to clamp the work sheet and thence. with further retraction. draws the punch 26 about the end of the anvil to fold the work sheet.
  • the anvil is provided with a folding edge 23a to provide a crease in the work sheet.
  • a second set of cylinders and pistons 40 are provided. one on each side of the machine. Piston rods 42 are each coupled by a pivotable clevis 44 to the punch 26. As is readily apparent. Movement of the punch in a counterclockwise direction. as shown in FIG. 2, will cause the piston rods 42 to be extended in the cylinders 40.
  • FIG. 3 illustrates a preferred hydraulic circuit for varying the amount of resistance force supplied by the piston rods 42.
  • a pump P driven by a motor M delivers pressurized fluid to a solenoid-controlled, spring-biased valve 50.
  • valve 50 directs fluid to line 51 to a three-way. spring-centered. solenoid-controlled valve 52.
  • the line 51 is connected to sump. Movement of valve 52 to the right directs line pressure from 51 to a line 53 and thence to the piston rod ends 34 of the cylinders 30.
  • the piston rods 34 begin to retract but movement is resisted by piston rods 42, thus pulling the cylinders 30 and slides 24 downwardly to place an initial clamping force on the work sheet as described earlier.
  • Fluid trapped in the piston rod ends of the cylinders 40 passes through lines 54 to a solenoid-operated valve 60 which. when energized. passes the fluid to a line 61 which is directed to sump through a pressure relief valve 62.
  • This pressure relief valve is of any conventional type which can be adjusted to open to sump through a range of 5 to 500 psi. Assuming valve 62 is set to open at a pressure of (if) p.s.i.. for example. the punch 26 will be unable to pivot until such time as the clamping force exceeds the 60 psi. resistance force of the piston rods 42. Once this pressure is exceeded. additional clamping force is applied. dependent on the resistance to bending of the material of the work sheet. By changing the setting of valve 62. it can be readily seen that the initial clamping force can be easily varied from low forces for soft materials to large forces for tough materials.
  • the rate of punch movement is controlled by a flow restriction valve 70 and a two-way. spring-return solenoid valve 75.
  • valve 52 When valve 52 is to the right. retracting piston rods 34. valve 75 is moved to the left. causing fluid from the head ends of cylinders 30 to pass through check valve 72 and thence through the flow restriction valve 70.
  • the valve 711 permits fluid to leave the cylinders at a controlled rate.
  • the piston rods 42 are retracted while simultaneously extending the piston rods 34 (and returning the punch ⁇ by moving the valve 52 to the left and valve 75 to the right. as shown in FIG. 3.
  • line pressure front line 51 passes through valve 75. thence b through check valve 72 to lines 54.
  • the movement of piston rods 42 to the right pulls the punch back down. causing the piston rods 34 to be extended through chains 36.
  • Valve 72 opens only after a slight. predetermined pressure is reached. so that fluid moves piston rods 42 prior to piston rods 34. thus assuring tension in the chains 36.
  • a variable load applying apparatus for a fluidoperated folding machine of the type having a frame provided with a work sheet supporting surface. an anvil spaced from said work sheet supporting surface. to allow free movement of a work sheet beneath and having a folding edge. a punch mounted for pivotal movement past said work sheet supporting surface and folding edge to bend a work sheet clamped between the anvil and work sheet supporting surface.
  • variable control means for determining the resistance force.
  • said means for providing a variable resistance force including second powered means flexibly coupled to said punch.
  • said first powered means including flexible coupling means secured to opposite ends ofsaid punch
  • said second powered means including second flexible coupling means secured to opposite ends of said punch.
  • said first and second powered means including hydraulic means for providing simultaneously opposed forces on said punch for controlling pivotal movement of the punch.
  • said folding machine including transversely spaced. upright side frames having guide slots therein.
  • said first powered means including cylinders and piston rods. linkage means pivotally securing each cylinder to said anvil. said flexible coupling means secured between the piston rods and said punch whereby retraction of said piston rods pulls said cylinders against said linkage means to push said anvil against said work piece supporting surface.
  • said cylinders and piston rods coupled between the punch and said frame.
  • said second powered means including force resistance means for providing a variable resistance force including hydraulic flow lines coupled to said cylinders.
  • said control means including a pressure relief valve coupled to said hydraulic flow lines for relieving fluid pressure in said cylinders to extend the piston rods and thus allow movement ofthe punch. only after the resistance force exceeds a predetermined amount.
  • said first powered means including primary cylinders and piston rods and bydraulic lines to said cylinders.
  • said control means ineluding main control valve means for directing flow to said primary cylinders to begin moving the anvil against the work sheet and thence pivoting the punch at a con

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
US448037A 1974-03-04 1974-03-04 Differential pressure device for folding apparatus Expired - Lifetime US3875784A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US448037A US3875784A (en) 1974-03-04 1974-03-04 Differential pressure device for folding apparatus
JP50026415A JPS5240912B2 (it) 1974-03-04 1975-03-04

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US448037A US3875784A (en) 1974-03-04 1974-03-04 Differential pressure device for folding apparatus

Publications (1)

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US3875784A true US3875784A (en) 1975-04-08

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Family Applications (1)

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US448037A Expired - Lifetime US3875784A (en) 1974-03-04 1974-03-04 Differential pressure device for folding apparatus

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US (1) US3875784A (it)
JP (1) JPS5240912B2 (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983735A (en) * 1975-03-21 1976-10-05 Berry Robert N Cleat forming method and machine
US20030159491A1 (en) * 2002-02-27 2003-08-28 Stalzer Leo H. Sheet metal bending machine for forming cleats
US20030159490A1 (en) * 2002-02-27 2003-08-28 Stalzer Leo H. Machine for forming cheek bends in sheet metal
CN106994475A (zh) * 2017-05-18 2017-08-01 镇江成泰自动化技术有限公司 一种电池盖板连接片折弯装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2228448A (en) * 1939-10-16 1941-01-14 Pittsburgh Forging Co Manufacture of metal articles
US3009201A (en) * 1959-10-29 1961-11-21 Fawn Fabricators Inc Material bending machine with roll bar
US3209570A (en) * 1962-09-28 1965-10-05 Walker Mfg Co Control device
US3388574A (en) * 1966-03-03 1968-06-18 Ignoffo Vincent Attachment for a tubing bender for controlling the depth of bend of tubing
US3581535A (en) * 1968-07-11 1971-06-01 Goodyear Tire & Rubber Method and apparatus for making blades

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2228448A (en) * 1939-10-16 1941-01-14 Pittsburgh Forging Co Manufacture of metal articles
US3009201A (en) * 1959-10-29 1961-11-21 Fawn Fabricators Inc Material bending machine with roll bar
US3209570A (en) * 1962-09-28 1965-10-05 Walker Mfg Co Control device
US3388574A (en) * 1966-03-03 1968-06-18 Ignoffo Vincent Attachment for a tubing bender for controlling the depth of bend of tubing
US3581535A (en) * 1968-07-11 1971-06-01 Goodyear Tire & Rubber Method and apparatus for making blades

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983735A (en) * 1975-03-21 1976-10-05 Berry Robert N Cleat forming method and machine
US20030159491A1 (en) * 2002-02-27 2003-08-28 Stalzer Leo H. Sheet metal bending machine for forming cleats
US20030159490A1 (en) * 2002-02-27 2003-08-28 Stalzer Leo H. Machine for forming cheek bends in sheet metal
US6796157B2 (en) * 2002-02-27 2004-09-28 Lion Machinery, Inc. Machine for forming cheek bends in sheet metal
US6810708B2 (en) 2002-02-27 2004-11-02 Lion Machinery, Inc. Sheet metal bending machine for forming cleats
CN106994475A (zh) * 2017-05-18 2017-08-01 镇江成泰自动化技术有限公司 一种电池盖板连接片折弯装置

Also Published As

Publication number Publication date
JPS5240912B2 (it) 1977-10-14
JPS50131843A (it) 1975-10-18

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