EP1160025A1 - Procédé de pliage de tôle forte, et coffre-fort en tôle forte pliée - Google Patents

Procédé de pliage de tôle forte, et coffre-fort en tôle forte pliée Download PDF

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Publication number
EP1160025A1
EP1160025A1 EP00401532A EP00401532A EP1160025A1 EP 1160025 A1 EP1160025 A1 EP 1160025A1 EP 00401532 A EP00401532 A EP 00401532A EP 00401532 A EP00401532 A EP 00401532A EP 1160025 A1 EP1160025 A1 EP 1160025A1
Authority
EP
European Patent Office
Prior art keywords
sheet
folding
folded
safe
equal
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.)
Withdrawn
Application number
EP00401532A
Other languages
German (de)
English (en)
French (fr)
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.)
Ets J Richard-Ducros
Original Assignee
Ets J Richard-Ducros
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 Ets J Richard-Ducros filed Critical Ets J Richard-Ducros
Priority to EP00401532A priority Critical patent/EP1160025A1/fr
Publication of EP1160025A1 publication Critical patent/EP1160025A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05G—SAFES OR STRONG-ROOMS FOR VALUABLES; BANK PROTECTION DEVICES; SAFETY TRANSACTION PARTITIONS
    • E05G1/00—Safes or strong-rooms for valuables
    • E05G1/02—Details
    • E05G1/024—Wall or panel structure
    • 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
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/52—Making hollow objects characterised by the use of the objects boxes, cigarette cases, or the like
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05G—SAFES OR STRONG-ROOMS FOR VALUABLES; BANK PROTECTION DEVICES; SAFETY TRANSACTION PARTITIONS
    • E05G1/00—Safes or strong-rooms for valuables

Definitions

  • the present invention relates to the field of heavy sheet metal, especially for the manufacture of safes.
  • a safe is a parallelepiped on one side opening.
  • a protective safe from a vending machine banknotes includes five fixed walls, upper, lower, right side, left side, and bottom, and a front wall forming door, some of these faces can be provided with holes necessary for the distribution of tickets.
  • the walls are made of sheet metal thick rolled hard steel to resist burglary.
  • Each of the five fixed walls is cut from a sheet blank by flame cutting, calibrated by press to reduce possible heat deformation during flame cutting, milled out of the four edges for exact dimensioning, chamfered to allow welding over the entire thickness of the sheet, if necessary drilled, equipped with its accessories, hinges, lock supports, locking square, supports interiors, then assembled with the other walls on a template, welded, and ground in the weld locations. Then we go up the door. We paints the safe. We mount the locks and condition the safe For transport.
  • the present invention provides a method and a machine for precise bending of thick sheets of high yield strength steel, and a safe with improved appearance and economical manufacturing without notable modification of interior and exterior volumes.
  • the process of folding heavy steel sheets comprises steps of pinching the sheet between two jaws with part of the sheet protruding from said jaws, and folding of said part of the sheet at a predetermined angle.
  • a face of the sheet comes into contact with a convex rounded surface, said part of the sheet being folded by pivoting about an axis passing through the center of curvature of the convex rounded surface.
  • a sheet undergoes two apt folds to give it a U-shaped section, the arms of the U can each be longer than the bottom of the U.
  • the folding angle is equal to 90 °, the sheet being bent at an angle slightly greater than 90 °, then returning by elasticity to the desired angle equal to 90 °.
  • the sheet is of thickness between 10 and 20 mm.
  • each sheet is folded in the direction of rolling. This avoids the appearance of cracks and cracks harmful to the mechanical properties of the sheet and its aspect.
  • steel sheets with high elastic limit, of tensile strength greater than or equal to 340 N / mm 2 , preferably greater than or equal to 690 N / mm 2 are bent, for example manufactured by hot rolling.
  • the U-folded sheet serves template for mounting and welding other sheets.
  • the sheet After folding during which it was pinched between the jaws, the sheet has a satisfactory flatness which avoids the step conventional press calibration necessary to perfect the flatness that the heating caused by flame cutting may have deteriorated.
  • the present invention also relates to a machine for folding of heavy steel sheets, of the press brake type, comprising a box spring forming a fixed lower jaw, a clamp forming a vertically movable upper jaw provided with a ruler for come into contact with the sheet metal, and a pivoting apron.
  • the rule includes a convex rounded end surface, the pivot axis of the deck passing through the center of curvature of the convex rounded surface.
  • the present invention also relates to a safe general parallelepiped shape with a top wall, a wall of below, a bottom wall, two side walls, the walls being assembled by welding, and a door capable of closing the front face, the walls being made of strong steel sheet.
  • the safe includes at least one folded monobloc piece provided with two folds giving it a section in U, the arms of the U being each of length greater than that of the bottom of the U.
  • the sheet is of thickness between 10 and 20 mm.
  • the folded monobloc piece forms at least three walls, two of which are parallel, for example the side walls.
  • the safe has an improved exterior appearance due to replacement of ground weld lines with fold lines. This replacement eliminates preparation and machining steps chamfers necessary for welding, assembly, welding and grinding of weld lines. We also reduce the footage of sheet metal in front be cut, in general flame cut, then milled, and we simplify the assembly template which can be adapted to large boxes different. This reduces manufacturing costs. We could however conceive of using other means of cutting sheets.
  • the walls are pierced and the installation of interior fittings such as shelf or equipment supports after folding, hence positioning accuracy increased.
  • the safe can be made of 12.7 mm (0.5 inch) sheet metal thick with a bending radius of 20 mm and used for protection banknote dispensing machines.
  • the low value of the radius folds to keep the installed interior layout unchanged in the trunk by its user.
  • the thickness of the sheet and the folding radius are linked.
  • the folding radius can be all the smaller that the sheet is thin.
  • the excellent precision of the dimensions of the one-piece part folded facilitates the arrangement of the other walls to be welded, the part folded monoblock serving, in a way, as a template for others walls.
  • the method and the machine according to the invention can be used for bending of sheets intended for other purposes, in particular metal framework, engineering structures, overhead cranes, gantries, pylons, boilermaking, shipbuilding, etc.
  • the safe shown here during assembly includes a folded monobloc envelope 1 comprising three panels 2, 3 and 4, the panels 2 and 4 being parallel and the panels 2 and 3 and 3 and 4 being respectively perpendicular.
  • the envelope 1 therefore forms a U whose branches are formed by the panels 2 and 4 and the bottom of which is formed by panel 3.
  • Panels 2 and 4 are intended to form the lateral faces of the safe, while the panel 3 is intended to form the rear face.
  • the safe is completed by a top panel 5, a lower panel 6 and a door 7 forming the front face.
  • the edges of envelope 1 and panels 5 and 6 are milled to obtain precision sufficient dimension less than or equal to 0.5 mm.
  • the edges are also chamfered to allow the welding of different panels on all or part of the thickness of the sheet which can be between 10 and 20 mm, for example equal to 12.7 mm.
  • the door 7 can be mounted by means of hinges not represented. Provision may be made for lining the door 7 with lock supports, anti-tear-off edges and any other accessory or security.
  • the machine includes a clamp 8 movable vertically with respect to a fixed base 9 and between which a sheet 10 can be arranged.
  • the box spring 9 includes a wedge 11 intended to receive and support the sheet 10 and whose upper surface undergoes ionic nitriding and has a higher hardness or equal to 60 HRC.
  • the wedge 11 has a flat front surface 11a and vertical.
  • the clamp 8 is movable by means of hydraulic cylinders not represented and is provided with a rule 12 intended to come into contact with the sheet 10.
  • the rule 12 is mounted in a longitudinal groove 13 of the clamp 8 and comprises a flat lower surface 12a intended to enter into contact with the sheet 10, an oblique rear surface 12b partially in contact with the groove 13, a flat upper surface 12c, parallel to the lower surface 12a and partially in contact with the groove 13, and a front surface 12d rounded and the center of curvature of which is referenced 14.
  • the center of curvature 14 is arranged in the plane of the front surface 11a of the wedge 11.
  • the front surface 12d is convex and tangent with the surface lower 12a and extends upwards until it is substantially vertical, its upper end being perpendicular to the upper surface 12c.
  • a flat sheet is advanced so as to present a portion 10a protruding from the wedge 11 and from the rule 12.
  • the folding machine also includes a movable apron 15 of rectangular cross section and shown in Figure 2, in lines strong in position before folding and in phantom in position after folding.
  • the apron 15 comprises a folding surface 15a disposed under the sheet 10 in contact with it.
  • Apron 15 includes also a stop surface 15b perpendicular to the folding surface 15a and which is in contact with the end surface 11a of the wedge 11 arranged under rule 12.
  • the surface of folding 15a is horizontal and the abutment surface 15b is vertical.
  • the abutment surface 15b is arranged in the same vertical plane as the center of curvature 14 of the rounded surface 12d of rule 12.
  • the surface lower 12a and the rounded area 12d of rule 12, and the area of folding 15a of the deck 15, are also the subject of a surface treatment such as ion nitriding to obtain surface hardness satisfactory, greater than or equal to 60 HRC, and a lifetime long enough.
  • the apron 15 is rotated 90 ° counterclockwise relative to its axis.
  • the folding surface 15a is vertical and in contact with the portion of sheet metal 10a.
  • the abutment surface 15b is horizontal in the same horizontal plane as the center of curvature 14.
  • the folding takes place as follows.
  • the clamp 8 being lifted by compared to the box spring 9, the sheet metal 10 is brought in, generally from the rear to the opposite of the deck 15, on the wedge 11, until a portion 10a of determined length protrudes from the end surface 11a.
  • the bed base 9 may be provided with rollers or balls with free rotation, not shown, behind the wedge 11 and on which the sheet metal rests.
  • the positioning of the sheet 10 can be facilitated by using positioning stops 16 (FIG. 3) blocking its movement in translation relative to the machine. Then, we just block the sheet 10 in lowering the clamp 8. The sheet 10 is thus taken between the wedge 11 and the rule 12.
  • the apron 15 is pivoted by the desired angle, generally 90 °, or by a slightly higher angle due to the elasticity of the sheet 10.
  • the folding surface 15a remains in contact with the sheet 10 by accompanying its folding along the surface 12d rounding of rule 12.
  • the accuracy of folding is guaranteed by the fact that the pivot axis of the deck 15 and the center of curvature 14 are confused.
  • the end of the folding surface 15a close of the abutment surface 15b will describe a circle concentric to that of the rounded surface 12d.
  • the sheet 10 is thus not only pinched between the wedge 11 and the rule 12, but also between the folding surface 15a and the rounded surface 12d.
  • This dynamic pinching during folding causes the concave side of the sheet 10 to press on the surface 12d which serves as a matrix and guarantees a constant and determined folding radius while by preventing any parasitic deformation of the sheet metal such as twisting or warping.
  • the sheet 10 includes a portion 10b already folded. Indeed, the portion 10b has done the object of a prior folding, for example on the same machine.
  • the portion 10b has done the object of a prior folding, for example on the same machine.
  • a change in thickness of the sheet causes a change in the distance between the bending axis and the bending surface 15a.
  • An apron 15 is therefore provided which is adjustable relative to its axis of pivoting.
  • a change in sheet thickness has a influence on the admissible bending radius and can therefore cause change in rule 12 hence a change in the position of the center of radius of curvature.
  • Means will also be provided for adjusting the position. of the pivot axis of the deck 15 relative to the rule 12, so that the pivot axis and the center of curvature 14 are always coincident.
  • the folding machine and method can be advantageously used for the manufacture of steel safes high yield strength, which removes a number manufacturing steps for the safe, including machining, welding and installation in a template, which leads to a reduction in costs of manufacturing and a better external appearance of the safe without modifying significantly its interior volume thanks to the small radii of curvature that we manage to obtain.
EP00401532A 2000-05-31 2000-05-31 Procédé de pliage de tôle forte, et coffre-fort en tôle forte pliée Withdrawn EP1160025A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00401532A EP1160025A1 (fr) 2000-05-31 2000-05-31 Procédé de pliage de tôle forte, et coffre-fort en tôle forte pliée

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP00401532A EP1160025A1 (fr) 2000-05-31 2000-05-31 Procédé de pliage de tôle forte, et coffre-fort en tôle forte pliée

Publications (1)

Publication Number Publication Date
EP1160025A1 true EP1160025A1 (fr) 2001-12-05

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ID=8173710

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00401532A Withdrawn EP1160025A1 (fr) 2000-05-31 2000-05-31 Procédé de pliage de tôle forte, et coffre-fort en tôle forte pliée

Country Status (1)

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EP (1) EP1160025A1 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2866378A1 (fr) * 2004-02-18 2005-08-19 Bouisset Architectes Sarl Local securise transportable
CN102527781A (zh) * 2010-12-29 2012-07-04 何志强 一种便携式多功能折弯机
CN113857905A (zh) * 2021-11-10 2021-12-31 中车大同电力机车有限公司 弹簧座弯板加工工装

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1582541A (en) * 1924-02-21 1926-04-27 Ringer Soren Metal receptacle and method of making same
US2438108A (en) * 1943-11-17 1948-03-23 Barler Sheet metal cabinet and method of making the same
DE2612485A1 (de) * 1976-03-24 1977-10-06 Josef Kuhn Biegemaschine
JPS61129522A (ja) * 1984-11-29 1986-06-17 Hitachi Ltd 曲げ角度検出・補正・加工方法
US4669394A (en) * 1985-03-26 1987-06-02 Fogleman H Frank Safes
WO1991005128A1 (en) * 1989-10-06 1991-04-18 Roland Dahlstedt Fire protected safe
DE4024610A1 (de) * 1990-08-02 1992-02-06 Bosch Siemens Hausgeraete Verfahren und vorrichtung zum biegen von abrundungen aufweisender eckbereiche
JPH0871637A (ja) * 1994-09-08 1996-03-19 Calsonic Corp 圧延板材の造管方法
US6044777A (en) * 1998-02-09 2000-04-04 Walsh; Michael J. Composite metal safe and method of making

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1582541A (en) * 1924-02-21 1926-04-27 Ringer Soren Metal receptacle and method of making same
US2438108A (en) * 1943-11-17 1948-03-23 Barler Sheet metal cabinet and method of making the same
DE2612485A1 (de) * 1976-03-24 1977-10-06 Josef Kuhn Biegemaschine
JPS61129522A (ja) * 1984-11-29 1986-06-17 Hitachi Ltd 曲げ角度検出・補正・加工方法
US4669394A (en) * 1985-03-26 1987-06-02 Fogleman H Frank Safes
WO1991005128A1 (en) * 1989-10-06 1991-04-18 Roland Dahlstedt Fire protected safe
DE4024610A1 (de) * 1990-08-02 1992-02-06 Bosch Siemens Hausgeraete Verfahren und vorrichtung zum biegen von abrundungen aufweisender eckbereiche
JPH0871637A (ja) * 1994-09-08 1996-03-19 Calsonic Corp 圧延板材の造管方法
US6044777A (en) * 1998-02-09 2000-04-04 Walsh; Michael J. Composite metal safe and method of making

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 322 (P - 511) 31 October 1986 (1986-10-31) *
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 07 31 July 1996 (1996-07-31) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2866378A1 (fr) * 2004-02-18 2005-08-19 Bouisset Architectes Sarl Local securise transportable
CN102527781A (zh) * 2010-12-29 2012-07-04 何志强 一种便携式多功能折弯机
CN113857905A (zh) * 2021-11-10 2021-12-31 中车大同电力机车有限公司 弹簧座弯板加工工装

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