US3777529A - Dual bend forming device and method - Google Patents

Dual bend forming device and method Download PDF

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Publication number
US3777529A
US3777529A US00236025A US3777529DA US3777529A US 3777529 A US3777529 A US 3777529A US 00236025 A US00236025 A US 00236025A US 3777529D A US3777529D A US 3777529DA US 3777529 A US3777529 A US 3777529A
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US
United States
Prior art keywords
forming
forming bar
sheet material
top surface
bar
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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
US00236025A
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English (en)
Inventor
H Kaufmann
E Lavoy
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.)
Strippit Di Acro Houdaille Inc
Original Assignee
Houdaille Industries Inc
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Filing date
Publication date
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Publication of US3777529A publication Critical patent/US3777529A/en
Assigned to STRIPPIT/DI-ACRO - HOUDAILLE, INC. A CORP OF DE reassignment STRIPPIT/DI-ACRO - HOUDAILLE, INC. A CORP OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HOUDILLE INDUSTRIES, INC., A CORP OF DE
Assigned to STRIPPIT-HOUDAILLE, INC., A DE. CORP. reassignment STRIPPIT-HOUDAILLE, INC., A DE. CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: STRIPPIT/DI-ACRO-HOUDAILLE, INC., A DE. CORP.
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
    • 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
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws

Definitions

  • the device incorporates a 52 U. c1 72 57 72 2, 4 mvab1e fmmmg bar whch endamps the end E J Cl 2 2 ,3? of a sheet between the forming bar and a base.
  • the [58] Field 320 321 forming bar has a radius bend lip projecting from it and a secondary angle die section spaced from the radius bend.
  • the secondary angle diie section overlies a he urethane is dis laced [56] References Clted urethane Insert 1n the base p by the pressure of the forming bar against the plate UNITED STATES PATENTS sufficient to force the plate to conform with the die 3,187,542 Heller urface of the forming bar A bar is actuatable to bend the end of the plate around the radius bend.
  • the invention provides a method anda device capable offorming adouble-angled hook end on sheet material ina minimum number of steps.
  • the sheet material is first enclamped between a forming bar having a radius bend projection and then it is subjectedto a radius brake orfolding bar which moves the end of 1the sheetmetal around the radius bend of the forming bar.
  • Thesecondary angle is formed without any additional steps being necessary by the provision of a urethane insertreceived in a channel ina base member underlying the enclamping forming bar.
  • the bar descends to enclampthe sheet metal, it presses the sheet metal against the urethane block deforming the urethanecBecause of the peculiar properties of urethane rubber, including its substantial incompressibility and extreme resilience, ,it willactas a confined hydraulic fluid to deformto fill the channel in which it is received-while exerting substantially uniform pressure simultaneously atall of its surfaces.
  • the pressure exerted by the top surface of the urethane rubber againstthesheet material enclamped between the rubber and the descending forming bar will force thesheetmaterialto conform to the shape of the undersurface of the forming bar. Therefore, by providing.
  • the urethane block is received in a rectangular channel in the base member of the machine.
  • the urethane block has a non-rectangular configuration in its free statelwith a top surface projecting above the surface of the base and a bottom surface chamfered to leave a bottom portion of the channel unfilled.
  • FIG. I is a diagrammatic plan view of a formingmachine according to thisinvention, illustrating the machine in open and (by dotted lines) closed positions.
  • FIG. 2 is a fragmentary cross sectional view of the sheet metal hooked end formed by the device of FIG. 1.
  • FIG. 3 is a fragmentary enlarged side view .of the metal forming end of the forming bar of the device of this invention.
  • FIG. 4 is an enlarged fragmentary view of thermetal formingsection of the base of the device of, FIG. 1.
  • FIG. 5 is anenlarged view similarto FIG. 4, showing the position of the forming bar during the metalbendingoperationandillustrating the formation of the secondary angle.
  • FIG. 2 illustrates the end portion of a strip of sheet metal 11 such as is used in printing plates.
  • the end has a hook 12 formed at the terminus thereof, as a radius bend in the metal. Closely spaced to the hook is a secondary bend 13.
  • the prior art has normally produced the hook 12 by enclamping the sheet metal 11 in a device which thereafter bends the end ofthe metal to form the hook. Subsequent operations were then provided to create the secondary bend 13. It is a primary object of this invention to provide a device which will utilize the closing force of the member which enclamps the sheet metal for the formation of the hook end to form the secondary angle 13 by pressing the sheet metal against a urethane block by a surface which has a corresponding angle formed thereon.
  • the method of forming the dual bend hooked end then incorporates only the steps of enclamping the sheet material between a first surface and the undersurface of a radius bend ended forming bar and a second step of bending an end portion of the sheet material around the radius bend end of the forming bar.
  • the method is essentially a one-step forming process wherein the only bending step comprises bending the end of the sheet material around the radius bend end of the forming bar.
  • the method incorporates an initiating step of enclamping the sheet material and due to the presence of the urethane rubber insert in the first surface, the secondary bend is formed simultaneously with the enclamping step as the urethane rubber forces the sheet to conform to the undersurface of the forming bar, the undersurface having an angle.
  • FIG. 1 illustrates a device which uses this method for forming the sheet metal end portion 10 in the manner described.
  • the device includes a machine base 18 having a top surface 19 above which is suspended a forming arm 20 or movable-shoe.
  • the arm 20 is pivotably attached as at 21 to the base 18 and is driven by a connecting arm 22 which is attached through a cam pivot 23 to a handle 24. Operation of the handle 24 from the position illustrated at 25 to the position illustrated at 26 moves the connecting arm 22 downward in an are from a point 29 above the arm pivot center point 23 to a point 30 therebelow.
  • the connecting arm 22 is pivotally attached to the forming bar or movable shoe 20 and therefore moves the shoe from the position illustrated at 32 to the position shown by the dotted lines 33.
  • An end portion 39 of the sheet material extends beyond the end 40 of the surface 10 and overlies a folding bar 41 which initially has a top surface 42 on a plane with the surface 19 of the base 18.
  • the folding bar 41 is attached to a handle 43 and is pivotably mounted to the base 18 for arcuate movement around a pivot point 44. Movement of the handle 43 from the position illustrated at 45 to the position illustrated at 46 moves the folding bar from the position illustrated at 47 to the position illustrated at 48. This curles the end portion 39 of the sheet metal 38 around the end of the forming bar 35.
  • the end portion 35 of the forming bar 20 has a radius bend projection 49 extending therefrom.
  • the radius bend projection has an outer surface which conforms to the inner surface 50 of the hook 12 formed in the sheet metal as illustrated in FIG. 2. Therefore, when the sheet metal end 35 is curled around the radius bend end of the forming bar, the metal will be bent to be curled or hook end configuration illustrated in FIG. 2.
  • the angle bend 52 Spaced from the radius bend projection 49 on the bottom side 51 of the end 35 of the forming bar is an angle 52.
  • the undersurface of the end 35 projects away from the angle 52 as at 53.
  • the angle bend 52 is used to form the secondary angle 13 of the hook end of FIG. 2.
  • the base member 18 has a groove 60 extending thereinto from the surface 19 inan area immediately below the end portion 35 of the forming bar when the forming bar is in the position illustrated at 33.
  • the groove 50 underlies the angle bend 52 of the end portion 5.
  • the groove 50 has a ure- 35 as illustrated in FIG. thane rubber block 62 received therein as illustrated in FIGS. 4 and 4.
  • the urethane rubber block preferably has an area substantially equal to or greater than the area of the groove 60.
  • the urethane block 62 preferably has a top surface 64 configuration which projects at least a portion 65 of the urethane block 62 above the surface 19 of the base.
  • the urethane block 62 has a peaked surface 64, the peak 65 being disposed in an area immediately behind the angle 52 of the end 35 of the forming bar when the forming bar is in its lowest position enclamping the sheet metal strip 38 between the surface 19 of the base 18 at the point 65 beyond the groove 62 and the bottom or undersurface 51 of the forming block.
  • a bottom corner 68 is chamfered as at 69 so as to not completely fill the bottom of the groove 60.
  • a sheet of material 38 has an end portion 39 inserted into the central opening 70 as illustrated in FIG. 1, with the end portion 39 projecting beyond the front end 40 of the base 18 and overlying a portion of the forming bar 41.
  • the handle 24 is moved from the position 25 tothe position 26 moving the forming bar 20 from the position illustrated at 33.
  • This brings the end portion 35 of the forming bar down to enclamp the end 39 of the sheet material between the land 65 spaced between the end 40 of the base and the groove 60.
  • Alignment pins 72 are provided on the land 65 to index with bores 73 in the end portion 35 of the forming bar.
  • the enclampment of the sheet metal also forces the sheet metal against the urethane block 62 toward the front edge 75 of the groove 60.
  • the handle 43 is moved from the position 45 to the position 46, moving the forming bar from the position illustrated at 78 in FIG. 5 to the position illustrated at 79 in FIG. 5. This curls the end portion 39 of the sheet metal which initially overlies the end of the forming bar 41 around the radius bend end 49 of the forming bar to form the hooked end of FIG. 2.
  • our invention provides a device capable of substantially similtaneously forming a hooked end and a secondary angle spaced from the hooked end in the end of a strip of sheet material without the necessity of secondary apparatus or secondary steps to form the secondary angle.
  • the secondary angle is formed in the same step which enclamps the end of the sheet material for formation of the hook by pressing the sheet material against a urethane block which will in turn urge the sheet material against an angled face on the forming bar used to enclamp the sheet material.
  • a device for forming a hook end for sheet material with a secondary bend closely spaced to the hook end comprising a base member having a top surface with an end face, a forming bar positioned above said top surface, said forming bar movable from a position above said top surface to a second position closely spaced to said top surface, said forming bar having a projection terminating in a radius bend, said projection overlying a portion of said top surface and extending beyond said end face when in said second position, said forming bar having a bottom surface with a first portion including a portion of said projection, a second portion of said bottom surface projecting at an angle to the first portion, the juncture of the first and second portions overlying a second portion of the top surface, means for inserting an end portion of a strip of sheet material be tween-said top surface and said bottom surface with a portion extending beyond the said end face, means for bending the said portion of the sheet material extending beyond the said end face around the said radius bend projection of the said forming bar
  • the method of forming a hooked end on a strip of sheet material with a secondary angled bend spaced from the hook using a forming bar having a radius bend projection and an angled undersurface comprises the steps of: providing a surface having a channel therein, providing a mass of urethane rubber in the channel having an area greater then the channel, enclamping the end portion of a sheet material between the surface and the forming bar with the angle of the forming bar overlying the channel by moving the forming bar towards the channel, pressing the forming bar against the sheet material and the sheet material against the urethane rubber, flowing the urethane rubber to fill the channel and to pressure the sheet material against the angled surface of the forming bar and bending the end of the sheet material around the radius bend projection, and withdrawing the forming bar.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US00236025A 1972-03-20 1972-03-20 Dual bend forming device and method Expired - Lifetime US3777529A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US23602572A 1972-03-20 1972-03-20

Publications (1)

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US3777529A true US3777529A (en) 1973-12-11

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US00236025A Expired - Lifetime US3777529A (en) 1972-03-20 1972-03-20 Dual bend forming device and method

Country Status (8)

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US (1) US3777529A (enrdf_load_html_response)
JP (1) JPS5127426B2 (enrdf_load_html_response)
CA (1) CA972271A (enrdf_load_html_response)
DE (1) DE2310488C3 (enrdf_load_html_response)
FR (1) FR2176863A1 (enrdf_load_html_response)
GB (1) GB1398353A (enrdf_load_html_response)
IT (1) IT982490B (enrdf_load_html_response)
SE (1) SE378197B (enrdf_load_html_response)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946588A (en) * 1973-11-28 1976-03-30 Protocol Engineering Limited Methods of and apparatus for edge-forming metallic plates
EP0023423A3 (en) * 1979-07-27 1982-01-13 Fisher & Paykel Limited Method of and means for forming sheet metal
US5491999A (en) * 1983-04-15 1996-02-20 Holloway; Bertram A. Gripper means for stretcher leveler apparatus
EP1433545A3 (en) * 2002-12-23 2005-03-16 A.M.T. S.r.l. Metal sheet bending unit, particularly for forming lips
US20070240482A1 (en) * 2006-04-14 2007-10-18 Trusted Tooling, Llc Tooling die slide driver

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2720304B1 (fr) * 1994-05-26 1996-08-30 Michel Goubaud Plieuse.
CN103480703B (zh) * 2013-09-09 2017-09-29 天津鑫茂天和机电科技有限公司 冷折弯装置
US10913369B2 (en) 2017-02-16 2021-02-09 Ford Global Technologies, Llc Charging energy recapture assembly and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1029012A (en) * 1911-10-06 1912-06-11 Higgin Mfg Co Cornice-brake.
US2444757A (en) * 1945-02-02 1948-07-06 Western Electric Co Article forming apparatus
US3187542A (en) * 1959-11-12 1965-06-08 American Type Founders Co Inc Bending apparatus for printing plates
US3258948A (en) * 1963-11-01 1966-07-05 Gen Electric Sheet metal forming apparatus
US3276239A (en) * 1964-04-06 1966-10-04 Kaufmann Tool And Engineering Press brake die retainer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1029012A (en) * 1911-10-06 1912-06-11 Higgin Mfg Co Cornice-brake.
US2444757A (en) * 1945-02-02 1948-07-06 Western Electric Co Article forming apparatus
US3187542A (en) * 1959-11-12 1965-06-08 American Type Founders Co Inc Bending apparatus for printing plates
US3258948A (en) * 1963-11-01 1966-07-05 Gen Electric Sheet metal forming apparatus
US3276239A (en) * 1964-04-06 1966-10-04 Kaufmann Tool And Engineering Press brake die retainer

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946588A (en) * 1973-11-28 1976-03-30 Protocol Engineering Limited Methods of and apparatus for edge-forming metallic plates
EP0023423A3 (en) * 1979-07-27 1982-01-13 Fisher & Paykel Limited Method of and means for forming sheet metal
US4392373A (en) * 1979-07-27 1983-07-12 Fisher & Paykel Limited Forming means
US5491999A (en) * 1983-04-15 1996-02-20 Holloway; Bertram A. Gripper means for stretcher leveler apparatus
US5740690A (en) * 1983-04-15 1998-04-21 Holloway; Bertram A. Method for stretcher leveling metal with a gripping element
EP1433545A3 (en) * 2002-12-23 2005-03-16 A.M.T. S.r.l. Metal sheet bending unit, particularly for forming lips
US20070240482A1 (en) * 2006-04-14 2007-10-18 Trusted Tooling, Llc Tooling die slide driver
US7712346B2 (en) 2006-04-14 2010-05-11 Trusted Tooling, Llc Tooling die slide driver

Also Published As

Publication number Publication date
FR2176863A1 (enrdf_load_html_response) 1973-11-02
GB1398353A (en) 1975-06-18
DE2310488A1 (de) 1973-10-04
DE2310488C3 (de) 1975-03-20
JPS495852A (enrdf_load_html_response) 1974-01-19
DE2310488B2 (de) 1974-08-08
JPS5127426B2 (enrdf_load_html_response) 1976-08-12
IT982490B (it) 1974-10-21
CA972271A (en) 1975-08-05
SE378197B (enrdf_load_html_response) 1975-08-25

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AS Assignment

Owner name: STRIPPIT/DI-ACRO - HOUDAILLE, INC. 12975 CLARENCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HOUDILLE INDUSTRIES, INC., A CORP OF DE;REEL/FRAME:004381/0716

Effective date: 19850121

AS Assignment

Owner name: STRIPPIT-HOUDAILLE, INC., A DE. CORP.,NEW YORK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:STRIPPIT/DI-ACRO-HOUDAILLE, INC., A DE. CORP.;REEL/FRAME:004660/0022

Effective date: 19861208

Owner name: STRIPPIT-HOUDAILLE, INC., 12975 CLARENCE CENTER RO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:STRIPPIT/DI-ACRO-HOUDAILLE, INC., A DE. CORP.;REEL/FRAME:004660/0022

Effective date: 19861208