US3282076A - Brakes for forming plate or sheet workpieces - Google Patents

Brakes for forming plate or sheet workpieces Download PDF

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Publication number
US3282076A
US3282076A US332202A US33220263A US3282076A US 3282076 A US3282076 A US 3282076A US 332202 A US332202 A US 332202A US 33220263 A US33220263 A US 33220263A US 3282076 A US3282076 A US 3282076A
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US
United States
Prior art keywords
ram
clamping
forming
frame
mandrel
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
US332202A
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English (en)
Inventor
Jr Percy L Cady
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.)
IMO Industries Inc
Delaval Turbine California Inc
Original Assignee
Delaval Turbine California Inc
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 Delaval Turbine California Inc filed Critical Delaval Turbine California Inc
Priority to US332202A priority Critical patent/US3282076A/en
Priority to NL6414670A priority patent/NL6414670A/xx
Priority to DE19641452748 priority patent/DE1452748A1/de
Priority to CH1638264A priority patent/CH445419A/de
Priority to DK625164AA priority patent/DK108521C/da
Priority to FR999463A priority patent/FR1417915A/fr
Application granted granted Critical
Publication of US3282076A publication Critical patent/US3282076A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means

Definitions

  • the workpiece for example a long piece of steel plate
  • a pair of working members or aprons which lie in parallel vertical planes and extend horizontally from end to end of the machine and at the two ends are pivotally supported by hearing means mounted in vertical columns of the framing of the machine.
  • a clamping ram in the form of a thick plate, lying in a vertical plane containing the axis of the apron pivots, which ram also extends from one of said columns to the other.
  • the ram equipped with a forming mandrel along its bottom edge, is movable vertically, upwards to permit insertion of the workpiece, and downwards to clamp it in place upon the working surfaces of the aprons.
  • the clamping position to which the ram is moved must be adjustable to suit the particular mandrel employed.
  • the total travel of the clamping ram must be substantial, and yet the finallyadjusted clamping position must be quite accurate and must be accurately and firmly held as against the substantial upward pressures exerted through the workpiece by the working operations of the aprons therebeneath.
  • the present invention relates to the operation of the clamping ram, especially in machines such as briefly described above, and more particularly relates to the mechanism for effecting the movements and clamping action of the ram, inclusive of the means for establishing various clamping positions for the ram.
  • the principal object of the invention is to render the variation, the setting, and the maintenance of the clamping position of the ram, very simple and at the same time reliable.
  • Another object of the inventtion is to reduce undesired stresses upon and undesired deformations of the machine and the workpiece upon which it is operating.
  • Still another object is to provide greater uniformity of pressure upon the clamping ram of such machines for the different positions over a given range of travel of the ram.
  • FIGURE 1 is a front elevational view of a brake for forming plate or sheet workpieces, with the left-hand column structure of the frame of the machine shown in section to expose interior parts;
  • FIGURE 2 is a vertical cross section taken on the line 22 of FIGURE 1;
  • FIGURE 3 is an enlarged fragmentary vertical crosssection taken on the line 33 of FIGURE 1 with the cylinder appearing in elevation;
  • FIGURE 4 is a fragmentary enlarged plan section taken on the line 4-4 of FIGURE 2;
  • FIGURE 5 is an enlarged section taken approximately on the line 55 of FIGURE 1 illustrating adjustable stop mechanism associated with the clamping ram of the machine, a part of the ram being shown in a lowered position, in engagement with an aligning seat on a part of the stop mechanism;
  • FIGURE 6 is a plan section taken on the line 66 of FIGURE 5;
  • FIGURE 7 is a vertical section taken on the line 7-7 of FIGURE 5.
  • FIGURE 1 I have illustrated a brake of the type generally illustrated in my prior Patent 3,044,526, dated July 17, 1962, but embodying, in presently preferred form, the improvements of the present invention.
  • the machine in general, comprises framing lying in a substantially vertical plane, including two upright end column structures 8 and 9, rigidly joined at the top by a horizontal frame structure 10, which may conveniently be formed of a pair of channel members (i.e. of U- section) extending nearly the full length of the machine, and joined at their ends to said column structures by suitable brackets 11, 11.
  • the machine incorporates a pair of aprons or wings 13 and 14, extending substantially the length of the machine, which at their upper edges have reinforcing angle-bars 15, 15, and carry wear-plates or forming-blades 16, 16.
  • the wings may be vertically stiffened, as by plates 14'.
  • Each of the wing members is mounted, at each end, for vertical adjustment in a massive hinge body, the hinge bodies for the wing or apron 13, being shown at 17, and those for the apron 14 being shown at 18.
  • These hinge bodies are mounted by interdigitating knuckles 19 and 20 respectively, upon the pivots 21, the axis of which constitutes the axis about which the forming-blades 16 must move during the forming operations.
  • the rocking of the wing or apron members 13, 14, and their associated parts hereinabove described, about the pivot means 21, may be effected, independently with respect to each of the wings, or conjointly, through controllable power means, such as the piston and cylinder assemblies 26, 27, in the manner set out fully in said prior patent.
  • controllable power means such as the piston and cylinder assemblies 26, 27, in the manner set out fully in said prior patent.
  • the thickness of the sheet or plate to be worked upon, the use of a stepped configuration of workpiece, the type of forming operation being performed, and the configuration of the mandrel being used in the machine are factors in the determination of the adjustments to be made in the positions of the forming assemblies (wings 13 and 14 an associated parts including the blades 16) relative to the axis of the pivot pins 21. This need not be elaborated upon at this point, since the adjustments and ice ea operation of those assemblies may be carried out in the same manner as that which is fully disclosed in my said patent.
  • the machine comprises a mandrel-equipped clamping ram.
  • This preferably comprises a pair of members, one being a heavy metal plate 28 of considerable vertical depth (as shown in FIGURES 1 and 2), extending from endto-end of the machine, and another being the mandrel 29, running along the bottom edge of the plate 28, and conveniently secured thereto by means of a rabbet or shoulder, and a retaining plate 31 having any suitable fastening means (not shown).
  • the mandrel 29 herein illustrated comes almost to a knife edge, as shown at 32, which is particularly suitable for the forming of sharp bends. Bends of various radii, however, are of course obtainable by applying different mandrels to the clamping ram, as will be apparent from inspection of my said prior patent, and particularly FIG- URES 15 to 27 thereof, which illustrate the use of a variety of mandrels in forming various bends, in several different forms of sheet or plate members.
  • the axis of the radius of curvature of the mandrel employed, the axis of the curvature imposed upon the workpiece, and the axis of the pivots 21 for the swinging of the wings must all be substantially coincident, as is fully brought out in my said prior patent. Accordingly, the clamping position of the ram must be adjustable to suit the configuration of the mandrel which is being employed. Accurately adjustable fixing of the downward limit of the clamping ram must accordingly be had. At the same time, ay such bottom limit of the movement of the ram must be rigidly held as against the upward thrusts imposed by the action of the working surfaces 16 (on the top of the wings) when they are bending the workpiece around the curved edge of the mandrel.
  • the tongues 28a are guided, so as to hold the ram plate 28 in its intended vertical plane, by guiding means such as shown in FIGURE 4, comprising wear strips 43 fixed to the member 28a, anti-friction guide members 44, and adjusting screws 45 held in lugs 46 fastened on the column structure of the framing.
  • this assembly also permits endwise and angular motions of the ram, within the vertical plane. The extent of these motions, however, is limited by the clearance between the arcuate end surfaces 47 of the ram plate extensions 28a and the bearing plates 48 fixed within the upright columns 8 and 9.
  • FIGURES 1, 2, 5, 6 and 7. the stop mechanism, the essential parts of this and of the associated indicator devices, will be seen in FIGURES 1, 2, 5, 6 and 7.
  • the description will refer to the stop mechanism and indicator at the right-hand end of the machine in FIGURE 1, although a duplicate mechanism is utilized at the left-hand end.
  • a fixed block 49 is secured to the tension members constituting the main walls of the column 9, and also secured by several compression members such as shown at 51, 52 to the pivot assembly 21.
  • On top of block 49 is a fixed seat 53 having a guideway 54 in its upper surface, to receive a movable wedge member 55.
  • the sloping upper surface 56 of this wedge member engages the sloping lower surface 57 of a second wedge member 58, which is fixed as against horizontal movement, but is guided for vertical movement, by means of the fixed vertical pins 59.
  • Wedge member 55 is horizontally moved to various positions, by means of the screw 61 which is threaded into the wedge member.
  • the screw 61 may readily be adjusted by hand, from outside of the column 9, by means of the knob 62, which is fixed on the outer end of screw 61.
  • a retaining ring 63 is fixed on the screw, at the inner side of the associated wall of the column 9.
  • the screw 61 has no appreciable axial motion, and when it is turned by knob 62 the wedge 55 must move backward or forward; which can be done when the ram is raised.
  • a concave seat 64 On top of the upper wedge member 58 is a concave seat 64, receiving a convex alignment member 65, having a flat upper surface 66.
  • the bottom face of the extension or tongue 28a of the main ram plate 28 seats on the surface 66, when the clamping ram moves down.
  • a firm and square seating will be assured, no matter what may be the adjustment of the two stops at the opposite ends of the ram, since the curved mating surfaces of the parts 58 and 65 will accommodate any angularity of the ram in the vertical plane, due to such difference in adjustment of the two stops.
  • the concavoconvex seats need not be spherical, but may be cylindrical, as shown, with the axis of the cylinder extending transversely to the general plane of the ram.
  • the axis of the pivot 38 for the operating cylinder 37, and the axis of the pin 33 securing the piston to the ram are made parallel to each other and to the axis of the cylindrical seating surfaces.
  • pointer 67 (as seen in FIGURE 5) is heavier than the portion 69, so that the latter is maintained in contact with pin 70.
  • the tip 71 of the pointer moves in proximity to a scale plate 72 which is fixed on the frame.
  • This plate carries indicia 73, which may be graduated to give a direct reading in fractions of an inch, representing the dimension of the radius of curvature of the mandrel which is to be employed.
  • a brake for forming plate or sheet workpieces, having a frame and a mandrel-equipped clamping ram adapted to cooperate with a working surface of a pivotally-mounted working member in the clamping and forming of a workpiece, and wherein the ram is movable so as to dispose the forming axis of the mandrel on, or at a distance from, the pivot axis of said pivotallymounted working member
  • the combination, with said ram, of mechanism for moving and holding it comprising a movable stop positioned to limit the stroke of the ram relative to the frame and having an adjustable wedge device for variably setting it to determine the clamping position of the ram, and a fluid-pressure device having a cylinder element and a piston element, one of which elements acts against the frame and the other acts against and moves with the ram so as to urge the ram against the stop and hold it there, by fluid pressure, in its workpiece clamping position.
  • a brake for forming plate or sheet workpieces, having a frame and a mandrel-equipped clamping ram adapted to cooperate with a working surface of a pivotally-mounted working member in the clamping and forming of a workpiece, and wherein the ram is movable so as to dispose the forming axis of the mandrel on, or at a distance from, the pivot axis of said pivotallymounted working member
  • the combination, with said ram, of mechanism for moving and holding it comprising a movable stop positioned to limit the stroke of the ram relative to the frame and having an adjustable wedge device for variably setting it to determine the clamping position of the ram, and a fluid-pressure device having a cylinder element and a piston element, one of which elements acts against the frame and the other acts against and moves with the ram so as to urge the ram against the stop and hold it there, by fluid pressure, in its workpiece clamping position, and means for accommodating angular changes of position of the clamping ram relative to the
  • a brake for forming plate or sheet workpieces, having a frame and a mandrel-equipped clamping ram adapted to cooperate with a working surface of a pivotallymounted working member in the clamping and forming of a workpiece, and wherein the ram is movable so as to dispose the forming axis of the mandrel on, or at a distance from, the pivot axis of said pivotally-mounted working member, the combination, with said ram, of
  • mechanism for moving and holding it comprising, stop means for the ram for limiting the stroke of the ram relative to the frame, said stop means being adjustable to set selectable locations for the clamping position of the ram, and mechanism adapted to move said ram to and hold it against said stop means, comprising a fluid-pressure device having a cylinder element and a piston element, one of which elements acts against the frame and the other acts against and moves with the ram so as to urge the ram against the stop and hold it there, by fluid pressure, in its workpiece clamping position.
  • a brake for forming plate or sheet workpieces, having a frame and a mandrel-equipped clamping ram adapted to cooperate with a working surface of a pivotallymounted working member in the clamping and forming of a workpiece, and wherein the ram is movable so as to dispose the forming axis of the mandrel on, or at a distance from, the pivot axis of said pivotally-mounted working member
  • the combination, with said ram, of mechanism for moving and holding it comprising, stop means for the ram for limiting the stroke of the ram relative to the frame, said stop means being adjustable to set selectable locations for the clamping position of the ram, and mechanism adapted to move said ram to and hold it against said stop means, comprising a fluid-pressure device having a cylinder element and a piston element, one of which elements acts against the frame and the other acts against and moves with the ram so as to urge the ram against the stop and hold it there, by fluid pressure, in its workpiece clamping position, and
  • a brake for forming plate or sheet workpieces, having a frame and a mandrel-equipped clamping ram adapted to cooperate with a working surface of a pivotally-mounted working member in the clamping and forming of a workpiece, and wherein the ram comprises an elongated member lying in a generally vertical plane and having its ends extended to regions adjacent to a pair of vertical columns of the frame, and said ram being movable in said generally vertical plane as as to dispose the forming axis of the mandrel on, or at a distance from the pivot axis of said pivotally-mounted working member, the combination of power means for raising and lowering the ram, a device for separately setting the lower limit of motion of each end of the ram, with respect to the frame, and adjustable-angle seating means adapted to accommodate different angularities of the ram accompanying the variations in setting of the limits of motion at the two ends of the ram.
  • a brake for forming plate or sheet workpieces, having a frame and a mandrel-equipped clamping ram adapted to cooperate with a working surface of a pivotally-mounted working member in the clamping and forming of a workpiece, and wherein the ram comprises an elongated member lying in a generally vertical plane and having its ends extended to regions adjacent to a pair of vertical columns of the frame, and said ram being movable in said generally vertical plane so as to dispose the forming axis of the mandrel on, or at a distance from, the pivot axis of said pivotally-mounted working member, the combination of power means for raising and lowering the ram, a device for separately setting the lower limit of motion of each end of the ram with respect to the frame, and guideways for the ram holding it in said generally vertical plane and constructed and arranged to permit it to be moved vertically and angularly in a vertical plane.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US332202A 1963-12-20 1963-12-20 Brakes for forming plate or sheet workpieces Expired - Lifetime US3282076A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US332202A US3282076A (en) 1963-12-20 1963-12-20 Brakes for forming plate or sheet workpieces
NL6414670A NL6414670A (da) 1963-12-20 1964-12-16
DE19641452748 DE1452748A1 (de) 1963-12-20 1964-12-17 Abkantmaschine
CH1638264A CH445419A (de) 1963-12-20 1964-12-18 Abkantpresse zur Verformung von Werkstücken aus Grob- oder Feinblech
DK625164AA DK108521C (da) 1963-12-20 1964-12-19 Bukkemaskine.
FR999463A FR1417915A (fr) 1963-12-20 1964-12-21 Machine telle que presse notamment pour le formage de pièces en tôle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US332202A US3282076A (en) 1963-12-20 1963-12-20 Brakes for forming plate or sheet workpieces

Publications (1)

Publication Number Publication Date
US3282076A true US3282076A (en) 1966-11-01

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ID=23297165

Family Applications (1)

Application Number Title Priority Date Filing Date
US332202A Expired - Lifetime US3282076A (en) 1963-12-20 1963-12-20 Brakes for forming plate or sheet workpieces

Country Status (6)

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US (1) US3282076A (da)
CH (1) CH445419A (da)
DE (1) DE1452748A1 (da)
DK (1) DK108521C (da)
FR (1) FR1417915A (da)
NL (1) NL6414670A (da)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4109542A (en) * 1975-07-07 1978-08-29 Aspro, Inc. Spun V-grooved sheet metal pulley with thick hub wall integral with thin side wall
US4457684A (en) * 1981-02-24 1984-07-03 Mts Systems Corporation Hydraulic press
WO1991013704A1 (de) * 1990-03-15 1991-09-19 Lift Verkaufsgeräte-Gesellschaft M.B.H. Blechbiegevorrichtung
US5295384A (en) * 1990-03-15 1994-03-22 Lift Verkaufsgerate Gesellschaft M.B.H. Sheet-metal bending device
WO1998004368A1 (en) * 1996-07-26 1998-02-05 Luciano Gasparini Improved bending pressing machine, particularly in the processes of metal working

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8303472A (nl) * 1983-10-10 1985-05-01 Liet Cornelis Hendricus Inrichting voor het buigen van plaatmateriaal.
WO1996024444A1 (de) * 1995-02-08 1996-08-15 Sbm Schoeller-Bleckmann Maschinenbau Ges. Mbh Arretiereinrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1633744A (en) * 1926-01-29 1927-06-28 Hughes George Apparatus for flanging and bending metal plates
CA548620A (en) * 1957-11-12 Emil Musijowski Rivet cutter
US2938232A (en) * 1957-06-21 1960-05-31 Hoover Co Combined injection and compression molding

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA548620A (en) * 1957-11-12 Emil Musijowski Rivet cutter
US1633744A (en) * 1926-01-29 1927-06-28 Hughes George Apparatus for flanging and bending metal plates
US2938232A (en) * 1957-06-21 1960-05-31 Hoover Co Combined injection and compression molding

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4109542A (en) * 1975-07-07 1978-08-29 Aspro, Inc. Spun V-grooved sheet metal pulley with thick hub wall integral with thin side wall
US4457684A (en) * 1981-02-24 1984-07-03 Mts Systems Corporation Hydraulic press
WO1991013704A1 (de) * 1990-03-15 1991-09-19 Lift Verkaufsgeräte-Gesellschaft M.B.H. Blechbiegevorrichtung
US5295384A (en) * 1990-03-15 1994-03-22 Lift Verkaufsgerate Gesellschaft M.B.H. Sheet-metal bending device
WO1998004368A1 (en) * 1996-07-26 1998-02-05 Luciano Gasparini Improved bending pressing machine, particularly in the processes of metal working

Also Published As

Publication number Publication date
CH445419A (de) 1967-10-31
DE1452748A1 (de) 1969-04-03
DK108521C (da) 1968-01-02
FR1417915A (fr) 1965-11-12
NL6414670A (da) 1965-06-21

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