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
  • B21D5/14—Bending sheet metal along straight lines, e.g. to form simple curves by passing between rollers

Definitions

• the present invention is do ⁇ maine of the work of sheet materials, such as sheets f in order to bend them, and more precisely for ob ⁇ jet a machine, called “rolling machine”, intended to bend sheets.
• a breyet FR-974.789 (BIGWOOD *) is known for a sheet metal rolling machine with a pivoting upper support roller and a retractable bearing; however, such a machine implements a complex mechanism for adjusting the bending radius by means of screws with motorized drive.
• Patents FR-2,528,335 and FR-2,637,206 from the same Applicant are not known for so-called crenellated rollers consisting of a large so-called support roller and a double plurality of so-called fairly small press rollers diameter with respect to that of the support roller and interpenetrating so as to be able to have contact lines with the support roller, closer together than would be possible with solid rollers, in order to increase the precision of the bending and of reduce as much as possible the parts remaining straight at the ends of the sheet metal at the inlet and at the outlet of the bending operation; in this type of machine the notched rollers, located at the above the large roller, are grouped into two parallel trains of rollers, each train itself being composed of several coaxial rollers; in some machines of this type, the bending radius is determined by varying the distance between the pres ⁇ rollers (crenellated) and the support roller, by means of a device with inclined planes (cams and sloping wedges) that can be moved against each other by a
• the object of the present invention is to make available to non-specialized workshops a bending machine which allows the bending of sheets of fairly large width, of small thickness, and / or made of a material of low hardness.
• a machine for bending sheets called rolling machine, of the rolling machine type mainly consisting of a roller, said support, around which is intended to wind the sheet after bending, and smooth rollers, called pressers , intended to put pressure on the support roller, is characterized in its generality in that the support roller around which the sheet is wound after bending, is connected at one end to a motor and is supported at this first end by a fixed bearing, and at its other end by a retractable bearing (tilting), the axis of this support roller remaining fixed, and in that the pressure rollers are smooth rollers arranged in pairs with a fixed center distance and supported by a plurality of bearings, or rollers , themselves supported by a beam resting itself on the frame by means of the sloping wedges
• the support roller with fixed axis is disposed above all of the pressure rollers so that the latter can be maneuvered vertically from bottom to top by the sloping wedges when they are applied against the sheet metal to be bent , and from top to bottom by the effect of their weight after the bending operation.
• the first difficulty resides in the fact that, so that the contact lines of the pressure rollers with the support roller can be fairly close to one another, relatively to the measurement of the diameters of the pressure rollers, such so that a sheet introduced between the first pressure roller and the support roller, comes into oblique contact with the upper quarter of the second pressure roller, it is necessary that the diameter of the pressure rollers is much less (about 1/3) than diameter of the support roller, and that these rollers are as close as possible to each other; or since the resistance to bending of a cylindrical beam varies roughly as the power four (D ⁇ ) of its diameter, their small diameter will cause significant flexibility, in practice unacceptable, of the pressure rollers.
• the term "as close as possible” means that their center distance e is between d and l, 5xd, this being the diameter, preferably identical for each, of the press rollers. , d being itself between 0.2 ⁇ D and 0.5 ⁇ D, D being the diameter of the support roller, the effective length of the latter being between 5 ⁇ D and 10 ⁇ D, the smallest bending diameter that is possible to obtain with a determined machine being between approximately 1.2 and l, 4xD; it will be noted that the choice of these dimensional relationships also falls within the scope of the invention because of the innumerable theoretical possibilities which they offer, a large number of which would prove to be inappropriate in practice, and which only an intuitive appreciation based on extensive experience has eliminated a priori.
• a solution proposed by the invention to solve the problem of bending the pressure rollers consisted in dividing the pressure rollers into sections, each section being supported in rotation, at its ends, by a support piece, the support pieces resting themselves on a beam, preferably in I, called intermediate, itself taking indirect support on the general frame of the machine.
• the rollers being con ⁇ formed into sections, it remained to solve the problem of "marking" of the sheets by the end edges of the sections; this problem has been solved by shifting the sections in the axial direction, so that the end edge of a section of a pressure roller is always opposite a cylindrical part of a section of the other roller , except for the ends of the rollers themselves; preferably the offset chosen is only very slightly greater than the thickness of the pi ⁇ these support, which thickness has been made minimal by a judicious choice of the suspension of the sections, and thanks to a Z-shape of the support parts; whereby even very thin sheets can be bent without being marked.
• a second solution proposed by the invention more particularly suitable for bending along a smaller radius, but still considering the problem of bending, consisted in adding to the pressure rollers divided into sections supported in rotation, a second stage of rollers small diameter arranged above the previous ones and also supported by the same support parts shaped as Z.
• the rollers of the second stage are continuous over the entire width of passage of the sheets, and rest either on rollers sectioned with support parts in Z, or more simply on rollers distributed over the passage width and supported by ordinary support parts.
• the rolling machine of the invention is represented as an assembly resulting from the combination permanent characteristics of the support roller and of its members, of bending compensation, drive and maintenance, and of the means for maneuvering the pressure rollers, and
• - fig.l is a side elevation of a rolling machine of the invention comprising, as such, the first and second characteristics, the latter pertaining to a first solution for producing the pressure rollers,
• FIG. 2 is a section along AA of the rolling machine of the previous figure, schematically and on a larger scale illustrating the arrangement and the dimensional relationships of the different rollers,
• Fig.3 illustrates in plan and on a larger scale the constructive arrangement of the pressure rollers and their support parts
• - Fig.4 is a perspective illustration of a bearing in the previous figure.
• - fig.5 is a partial cutaway perspective view of the rolling machine of fig.l
• - fig.6 is schematic illustration in cross section of a rolling machine according to the second embodiment of the pressure rollers
• - Fig.7 is a section along AA of the previous figure
• Fig.8 is a perspective illustration of a bearing in the previous figure
• FIG. 9 is a simplified schematic illustration in perspective of the rollers of a rolling machine according to the third solution for producing the pressure rollers.
• FIG.10 and 11 illustrate, seen at the end, the pressure rollers of the previous figure with their support rollers and their end (fig.10) and intermediate (fig.ll) support parts, and
• - Fig.12 illustrates in a direction perpendicular to that of the previous figures, the arrangement of the support rollers on their support part.
• a rolling machine of the invention consists mainly of a frame consisting of a massive beam-frame 1 in I, an upper roller of large diameter D, called support roller 2, in the direction of which can be requested from bottom to top, two trains 3,4 of rollers of smaller diameter, called pressure rollers, each consisting of a plurality of sections of rollers; the pressure rollers are sup ⁇ carried by means of support parts such as 5 by an I-beam called intermediate 6.
• the intermediate beam 6 can be maneuvered in vertical translation, between end guides 26, by an operating device of the kind with a ramp 7 of cams and sloping wedges 8 bearing on the frame beam 1; the ramp 7 is moved in horizontal translation by a pair of jacks such as 9; the adjustment of the amplitude of the vertical displacement of the support beam, therefore of the gap between the pressure rollers and the support roller, the gap which determines the bending radius, is effected by the horizontal displacement of a stop 10, by means of a screw 11 which can be driven manually in rotation tation by a crank with gravitation ⁇ indicator dial 12.
• the support roller 2 is supported at a first end 13, from which it is rotated by a hydraulic motor 14, by a very robust first bearing 15 with double bearing, and at its other end 16 by a retractable bearing 17 formed in a tiltable part called "gate" 18; this arrangement allows the axial withdrawal of the sheets after bending
• d diameter of the pressure rollers (113 mm)
• e distance between the pressure rollers (120 mm)
• D diameter of the support roller O (310 mm) )
• the pressure rollers each consist of a plurality of sections 31, .32, 33 .. of equal length, and it is noted that the adjacent ends of four adjacent sections are supported by a common support piece, such as
• the roller sections each consist of a hollow cylinder, such as 44 visible in section, rotatably mounted on a coaxial central shaft 45 by bearings such as 46 arranged in the vicinity of each of the ends of the section; the shaft itself being fixedly engaged in an opening bore 57 of the adjacent wall 53 of a support part 5 (fig.4); each bore, with the exception of those of the support parts for the end of the rollers, thus supports two adjacent coaxial shafts.
• the ramp 7 itself is maneuverable in thrust by a pair of hydraulic jacks such as 9 by means of a transverse piece called "stirrup" 23, to which the ramp is connected.
• the gate 18 with bearing 17 is articulated on the frame 1 in order to be able to tilt (arrow 19) under the effect of a jack 20 between a vertical position in which the bearing 17 encloses the cylindrical-conical end 16 of the roll of support 2, and a horizontal position pillowcase (not shown) in which it releases the end of the roller to allow the withdrawal of the bent sheet.
• a jack 20 between a vertical position in which the bearing 17 encloses the cylindrical-conical end 16 of the roll of support 2, and a horizontal position pillowcase (not shown) in which it releases the end of the roller to allow the withdrawal of the bent sheet.
• the cylindro-conical, or even rounded, shape of the end 16 of the support roller allows the axis of the latter to remain fixed during the maneuvering of the gate, or even during the extraction of the curved sheet.
• the cylinder 20 of the gate, the vines for operating the ramp 7 and the hydraulic motor 14 for driving the support roller 2 are supplied with pressurized fluid by a common hydraulic power unit, not shown but which is advantageously fixed to the around the end of the general frame where the engine is located.
• the hydraulic motor can be replaced by a simple electric geared motor or by an electric motor with a "brushless" type axis, and the hydraulic jacks by screws. balls and spindle motor; it will also be noted that the manual operating device can adjustment means can be replaced by an assembly placed under numerical control so as to be able to vary in a programmed manner the bending radius during the passage of the same sheet, and thus obtain finally an oval, elliptical or polygonal shell with rounded angles.
• a rolling machine that relements the second solution, has a lower stage of rollers such as 31, of axis 31 ', which are three in number and which serve as support for the two pressure rollers 32, of axis 32 ', of small diameter and fairly close together, located above them.
• a roller 32 of the previous figure is a solid roller while a support roller 31 is mounted on ball bearings on a fixed shaft 33; the rollers 31 and 32 are supported by support parts 34 in Z such as the part of fig.8, similar to that of fig.4, on which are shown the axes 31 'and 32' of the rollers.
• the rollers, both presser 32 and support 31, of the rolling machine of fig.6 to 8 are discontinuous sections.
• the pressure rollers 42 are continuous, that is to say that they extend over the entire width of passage of the sheets, lengthwise of the rolling machine; the rollers 42 are supported from place to place by pairs of rollers such as 43 arranged on either side of an intermediate support part such as 44, or on one side of an end support part such as 45 .
• the machine can be provided with means for automatically varying the radius of curvature during the rolling operation, so as to produce ferrules (rolled sheets) with a non-circular profile (for example elliptical, or triangular with angles rounded, etc.).
• a non-circular profile for example elliptical, or triangular with angles rounded, etc.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)
• Rolls And Other Rotary Bodies (AREA)
• Delivering By Means Of Belts And Rollers (AREA)
• Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
• Veneer Processing And Manufacture Of Plywood (AREA)
• Press Drives And Press Lines (AREA)
• Manufacture Of Wood Veneers (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9493034

Family Applications (1)

Country Status (12)

Families Citing this family (8)

Family Cites Families (10)

• 1996
  • 1996-06-06 FR FR9607375A patent/FR2750061B1/fr not_active Expired - Fee Related
• 1997
  • 1997-03-28 CA CA002257192A patent/CA2257192A1/fr not_active Abandoned
  • 1997-03-28 AT AT97919438T patent/ATE202020T1/de not_active IP Right Cessation
  • 1997-03-28 DE DE69705221A patent/DE69705221D1/de not_active Expired - Lifetime
  • 1997-03-28 EP EP97919438A patent/EP0907432B1/de not_active Expired - Lifetime
  • 1997-03-28 DE DE69705221T patent/DE69705221T4/de not_active Expired - Lifetime
  • 1997-03-28 CN CN97195213A patent/CN1089282C/zh not_active Expired - Fee Related
  • 1997-03-28 AU AU23914/97A patent/AU2391497A/en not_active Abandoned
  • 1997-03-28 US US09/194,630 patent/US6079247A/en not_active Expired - Lifetime
  • 1997-03-28 ES ES97919438T patent/ES2158553T3/es not_active Expired - Lifetime
  • 1997-03-28 WO PCT/FR1997/000563 patent/WO1997046336A1/fr active IP Right Grant
  • 1997-05-27 ZA ZA9704614A patent/ZA974614B/xx unknown
  • 1997-06-03 TW TW086107585A patent/TW383236B/zh not_active IP Right Cessation

Non-Patent Citations (1)

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