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
  • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
  • B21D5/08—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers
• • 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
  • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
  • B21D5/08—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers
  • B21D5/083—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers for obtaining profiles with changing cross-sectional configuration
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling

Definitions

• the invention relates to a system for cold rolling profiling of variable section profiles according to the preambles of claims 1 and 11.
• Such systems are disclosed in German Patent Application DE 10 2007 059 439.0, the contents of which are incorporated herein by reference, DE 100 11 755 A1 , DE 2004 040 257 A1 and US 3,051,214 A.
• an additional form element is present on one leg of the profile, such as the bevelled edge of hat and C profiles, which are used as passenger cars Doors or parts of the underbody of a vehicle find use and have a relatively large cross-section in relation to the sheet thickness, such undesirable form deviations are even more noticeable.
• the additional form element is still perpendicular or approximately perpendicular to the axis of deformation, then this form element constitutes a stiffener and must not only be bent, but also stretched or compressed.
• the object of the invention is to counteract the form deviations caused by compression, elongation, springback and deflection during cold rolling profiling of profiles with variable cross-section rational.
• DE 10 2007 002 322 A1 discloses a method for extrusion profiling of sheets of light metal, wherein after a roll reducing the thickness, a directional bending facilitated by the process heat takes place.
• this is a continuous process involving the Adjustment elements by hand until the desired final cross-section is achieved, and because the sheets are addressed in a warm state, eliminates the hard-to-calculate influence of the springback.
• the invention is particularly suitable, one would need countless steps until the reformer has been adjusted so that the cold rolled profile has the correct final shape.
• FIG. 1A is a perspective view of a variable width C-profile
• FIG. 1B is a top plan view of the C-profile of FIG. 1A;
• FIG. 5C shows five cross-sectional views superimposed on one another of a similar C-profile as in FIGS. 1A and 1B along the sectional lines drawn in FIG. 1B;
• FIG. 2 an explanatory sketch of the working principle of a reforming device
• Figure 3 is a perspective view of a reforming device with three work rolls and a support roller.
• Fig. 4 is a schematic perspective view of a reforming device with a small moving press.
• Fig. 5 is a schematic diagram of a reforming device with clamping shoes.
• the forming unit is known to comprise a series of adjusting stands, each having a roller stand containing a pair of rollers between which a sheet metal strip is guided lengthwise.
• the roller stands are translationally displaced during cold rolling profiling transversely to the length of the sheet metal strip and rotationally about an axis of the roll stand to transform the sheet metal strip into a profile with a variable cross-section.
• the roles of a roll stand are often parallel to each other, but the axes of rolls with variable diameter in the longitudinal direction can also be slightly oblique to each other.
• a profile with variable width wherein the adjusting frameworks are adjusted during the passage of a sheet in the width direction of the profile.
• a profile with variable width and constant height is e.g. a hat profile or the C profile shown in Figures IA to IC.
• the principles described herein can be applied by varying the adjustment directions of the adjusting stands, but also to the cold rolling profiling of variable height and width profiles or of variable width and height profiles.
• Figures IA and IB show an intermediate stage of a C-profile en route to a C-profile, having a first constant width section from AA to B-B, a steadily increasing width section from BB to DD, and a second section of constant Width from DD to EE should have.
• This structure is already indicated in FIGS. 1A and 1B, but not yet pronounced. It can be seen from the material structure lines drawn in FIGS. 1A and 1B that in regions with a convex curvature, as in the case of the transition from a section of constant width into a section which becomes steadily wider, the profile edge has to be stretched. In this area also often formed in the tread bottom of a trough (section BB). In areas of the profile with Convex curvature, so for example, the transition from a steadily widening section in a section with a constant width, the band edge is to compress, and the profile bottom is often a bump from (section DD).
• the discontinuities at the transitions between the different profile sections with different course along the length X of the sheet metal strip prevent the discontinuous roll forming of cross sections from achieving the desired forming. If an additional form element is present on a lateral leg of the profile, then this unfavorable effect is even more noticeable. In addition, if the additional form element is still in a plane perpendicular or approximately perpendicular to the axis of deformation, as the narrow edge portions at the top of the C-profile in Figures IA to IC, then it represents a significant stiffening, which additionally stretched or compressed during molding must become. Even without such additional features, as in a U-profile, the compression or stretching of the sheet metal material difficult, since the material is not deformed as desired, but possibly evades the complete cross-section.
• a reforming device behind at least one of the roller stands a reforming device is arranged, which has at least one drive for generating a movement of the reforming device in a plane transverse to the length X of the sheet metal strip, which drive based on data from material and thickness of the Sheet metal strip, the Konf ⁇ gurations- and An Kunststoff Scheme the roll stands and the CAD data to be formed profiles are calculated, is controlled so that the reformer any form deviations of the at least one roll stand leaving sheet metal strip due to compression, elongation and / or spring back during operation of the System reverses automatically.
• FIG. 2 shows a running between two roller stands not shown or the last roller stand straight leaving section of a metal strip 2, which is again formed between two rollers 4 and 6.
• the difference of the rollers 4 and 6 of the reforming device of Fig. 2 to the rollers of the roller stands is that the rollers of the roller stands normally lie exactly opposite each other on the sheet metal strip 2, while the rollers 4 and 6 are offset in the longitudinal direction X of the sheet metal strip 2 against each other ,
• the rollers 4 and 6 are pivoted about an axially parallel axis of rotation lying between, as indicated in Fig. 1 by a curved arrow, and / or if necessary, also translationally displaced form deviations in the sheet metal strip 2 can be corrected.
• FIG. 1 A particularly advantageous shaping device is shown in FIG. This works according to the three-roller principle, wherein a bend is made around three contact lines, and contains three work rolls in the form of a forming roller 8 and two smaller rollers 10 which rest against a portion of the sheet metal strip 2 to be reformed, and a support roller 12 for the two small rollers 10.
• the two small rollers 10 are delivered only for the period of recovery. Either each axis of the two small rollers 10 is delivered with its own drive, these drives are e.g. can be supported on the roller stand arranged in front of it, or the delivery takes place via only one drive, by the two small rollers 10 are simply pulled together, the angle between support arms 14, which hold the small rollers 10 on the circumference of the support roller 12 is reduced. Attacks for these movements are useful, but not mandatory.
• the small rollers may be installed at a fixed distance, and the large roller is delivered by a suitable drive and suitable mounting. It is also possible, with a reforming stand with three forming rollers 8 and 10, with or without support roller 12, without delivery of the small rollers 10 to generate the deformation by the recovery frame is only rotated.
• rollers 4, 6 of Fig. 2 or the rollers 8, 10 and 12 of Fig. 3 can sit on their own guide and are moved by suitable drives, such as threaded spindle drive, servo-hydraulic cylinders or pneumatic cylinders.
• suitable drives such as threaded spindle drive, servo-hydraulic cylinders or pneumatic cylinders.
• the leadership of the rollers is advantageously mounted perpendicular to the profiling X.
• a numerical control is recommended, but can also be realized by a point-to-point control. Fixed stops are also possible.
• the possible solutions given here can be applied at any stage of the roll forming process.
• the recovery can be carried out already at the beginning, in the middle or at the end after the roll forming.
• these operations should be performed at the end of the roll forming, so that deformed sites in the possibly existing further mold elements are not crushed during the further roll forming. If necessary, some of these operations or final corrections may be made in a downstream process outside the rollforming plant.
• a certain degree of deformation should already be achieved, since the unwanted shape deviations increase with progressive profiling. The following criteria must be considered:
• a reforming device can also have two sliding shoes instead of rollers.
• the shoes are delivered at the appropriate time as the rollers in the previously described embodiments.
• the drive is electrical, hydraulic or pneumatic.
• the sliding shoes work like the rollers, only with sliding surface contact.
• Such a sliding block unit can be positioned firmly in front of or behind a roller stand. In this case, a controlled movement is required transversely to the sheet metal direction or perpendicular to the surface of the profile cross-section segment to be formed. Furthermore, such a sliding block unit can also travel with the sheet feed and thus requires a not necessarily controlled freedom of movement along the sheet conveying direction. The direction of movement is advantageously performed parallel to the position of the band edge in this forming stage.
• the trajectory of the sheet metal strip can be corrected.
• a roller stand is not only moved tangentially to the predetermined contour, but the trajectory is driven with an offset. However, this succeeds only in certain cross sections, possibly with an undeformed element (buffer element) between the individual profile segments (floor, transition element and side wall).
• material may be added.
• the blank is adjusted so that a certain amount of material is compressed in the opposite direction in the cross-section.
• the additional material then starts at certain areas of the roll and thus creates a force effect, which brings about the desired bending or compression.
• Fig. 5 shows an exemplary embodiment, in which movable clamping shoes 18, 20 clamp a portion of the rollers 22, 24 of a roller stand leaving sheet metal strip 2 between them and thus prevent dodging of the entire profile.
• the clamping shoes 18, 20 are in the feed direction X of the sheet metal strip 2, possibly also obliquely thereto, ie with a component in the vertical Z to the sheet metal strip plane, movable or positively guided.
• the clamping shoes 18, 20 passively pulled along by the advancing movement of the sheet metal strip 2 a piece. The clamp is then released, and the clamping shoes 18, 20 are actively returned to the starting position.
• clamping shoes 18, 20 instead of the clamping shoes 18, 20 or in addition also support rollers or shoes can be used. These are to be positioned in front of and behind a roller stand.
• the clamping shoes, support rollers or sliding shoes are mounted so that the profile cross-section at the time of forming the transition between different profile sections can not escape.
• Retaining elements for the clamping shoes, support rollers or sliding shoes must be movable in the vertical Z to the metal band level and the profile contour to be moved controlled accordingly. Such retainers only occur at the discontinuities of the profile, i. at the transitions between different profile sections, or in the formation of variable radii used. It can thus be introduced the required compression or extension.
• the working direction of the press is perpendicular to the surface of the profile to be introduced with contour.
• the stamp shapes the desired shape in the profile cross-section, and possibly the necessary compression is introduced into adjacent profile segments.
• a bead can be pressed into the additional mold element to give the excess material a new geometry.
• the design of the pressing tool is to ensure that only the geometry of the sheet is changed and not the metal strip is stretched. It is recommended to use large radii in the pressing tool and to avoid clamping in the edge areas of the tool. Of course, the material is also deformed here, i. compressed and stretched. The goal is to change the geometry.
• a stationary press is also possible.
• Another solution is to make the inner and outer rollers of a roller stand independently adjustable. Normally, the two forming rollers of a roller stand are tangent to the profile contour, wherein the line connecting the centers of the rollers is always perpendicular to the clamped portion of the sheet metal strip. But if you can move the two roles independently, a lateral offset of the two roles is specifically possible. This results in a lever, and thus can be exerted on the profile contour, a bending moment, according to the same principle as it is applied in the reforming device of FIG. 2 by means of dedicated rollers.
• the constructive implementation may be such that only one roller is driven and the second roller can be moved in a pivoting manner.
• drives for this pivoting movement are pivoting gear with high translation, spindle drives with lever or hydraulic or pneumatic cylinders.
• the drive of the pivoting movement can be numerically controlled to be able to control this deformation exactly, but you can also provide a binary axis, as in this case is driven against a stop and on the movement of the entire roller stand, the deformation can be controlled.
• Another solution is to selectively heat the metal strip to facilitate flow of the material. If the sheet-metal strip is heated sufficiently strongly at the points to be bent or stretched, the deformation or the flow of the material takes place considerably more easily. Suitable methods are local heating with the gas flame, laser or induction.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)
• Control Of Metal Rolling (AREA)

Applications Claiming Priority (2)

Publications (1)

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Citations (1)

Family Cites Families (31)

• 2008
  • 2008-10-02 DE DE102008050366A patent/DE102008050366B4/de not_active Expired - Fee Related
• 2009
  • 2009-09-29 US US13/122,412 patent/US20110179842A1/en not_active Abandoned
  • 2009-09-29 CN CN2009801395941A patent/CN102170979A/zh active Pending
  • 2009-09-29 BR BRPI0920724A patent/BRPI0920724A2/pt not_active IP Right Cessation
  • 2009-09-29 WO PCT/EP2009/062580 patent/WO2010037731A2/de active Application Filing
  • 2009-09-29 KR KR1020117008390A patent/KR20110061620A/ko not_active Application Discontinuation
  • 2009-09-29 EP EP09783521A patent/EP2342029A2/de not_active Withdrawn
  • 2009-09-29 MX MX2011003554A patent/MX2011003554A/es not_active Application Discontinuation

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