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
  • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
  • B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
  • B21D3/05—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers arranged on axes rectangular to the path of the work
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21F—WORKING OR PROCESSING OF METAL WIRE
  • B21F1/00—Bending wire other than coiling; Straightening wire
  • B21F1/02—Straightening

Definitions

• the present invention relates to a method for straightening parts in a roller straightening machine.
• Roll straightening is a bending process in which tools, namely straightening rolls, rotate, with the straightening material! Bending changes is subjected.
• the machines used for this purpose are called straightening machines. Therein, the straightening material is moved between two opposite and offset rows of Richtwaizen. The upper and lower straightening roller rows are offset from each other so that they can each dip in the space between the opposite pair of rollers.
• the immersion depth and the geometry of the straightening rollers determine the size of the alternating bends, which must be partially plastic.
• the largest alternating bends take place on the inlet side of the straightening machine and are usually set decreasing towards the outlet side of the machine, with no bends on the straightening material being usually applied at the outlet.
• tape straightening and parting.
• band straightening refers to the straightening of bending straps wound on coils, which must be unwound and planed before further processing, for example in a press or profiling system.
• the band straightening machines are thus always in a process line and must ensure process reliability by maintaining the required flatness tolerances of the straightened belt. It is usually an intermediate production stage. In contrast, tea extracting is usually a final production stage.
• FIG. 1 in FIG a Sectionerichtmaschine 1 is shown schematsch.
• the General ⁇ chtmaschine 1 has an upper straightening roller block 3 and a lower Richtwaizenbiock 5.
• the upper straightening roller block 3 a set of upper straightening rollers 7 are supported, which are supported by support rollers 8.
• a set of lower straightening rollers 9 are arranged, which are supported by support rollers 10. According to illustrated Section ⁇ chtmaschine 1 in Fig.
• the lower straightening roller block 5 is fixedly arranged in a machine stand (not shown), while the upper Richtwaizenbiock 3 can be adjusted in its position and skew and is located in an upper roller mill.
• the setting of the aiming gap by means of a Richtspaltregelung, with the example, deviations from the desired setpoint of the aiming gap can be readjusted.
• the straightening material in the form of a part 11 is conveyed by the General ⁇ chtmaschine 1 according to arrow 13. It passes from an inlet side 15 to an outlet side 17.
• the upper Richtwaizen 7 are immersed in the spaces between the lower straightening rollers 9, whereby corresponding alternating bends in part 1 1 are generated.
• the depth of immersion of the upper straightening rollers 7 in the lower straightening rollers 9 decreases steadily until a distance is achieved which essentially corresponds to the material thickness of the part 11.
• the set straightening gap is decisive for the straightening result.
• the setting in the vicinity of the inlet side or outlet side of the leveler is selected.
• the upper Richtwaizenbiock 3 according to double arrow 19 is movable in the vertical direction and according to double arrow 21 also about an axis parallel to the axes of the upper and lower straightening rollers axis.
• all required pitches of the Richtspalts can be realized.
• a disadvantage of straightening machines is that the straightening gap does not remain constant during straightening, but changes according to the suspension behavior of the mechanical components. The thicker the parts, the greater the forces and the more must be dimensioned. The spring travel is particularly important for thick the parts multiples of the theoretical set value required for the rigidity of the components.
• the leveling control can demonstrably focus on parts straightaway, for which, in the best case, several passes would be required on conventional leveling machines or can not be aligned there at all.
• Fig. 2 shows the course of the bending stress and Fig. 4, the bending moment.
• the largest bending moment transmittable in the rectangular cross-section is, under the assumption of an ideai-elastic-plastic material behavior, 1.5 times the bending moment already mentioned, which produces flow at the cross-sectional edge.
• the flow is here already spread over the entire cross section and the carrying capacity of the cross section is exhausted.
• the parts to be straightened usually have a cross section depending on the contour and the thickness of the part. The moment of resistance is therefore not constant but changes over the length of the part.
• the present invention is therefore based on the object of specifying a method for straightening parts in a parting machine, in which the above-mentioned disadvantages are avoided, and with which a significantly improved result is achieved in the directed parts.
• the method comprises the following steps:
• g refer the values bs 2 M to the specific rule value of the leveler and multiplying these resulting values by the value of maximum deflection (max X) of the roll mill containing the adjustable straightening roller block, and the ratio of the yield point of the straightening material ( ⁇ f ) to the maximum design size of the straightening machine, from which H) adding while directing the part to be straightened of the determined for each directional triangle offset value to the default value of the Richtspaltes on the inlet side of the leveler for Nachfah- ren the adjustment of the aiming gap in dependence of the imaged in the aiming gap on the part to be straightened moving directional triangles.
• the alternating bends produced in the machine are strongly interdependent, which is in contrast to a single adjustment of the straightening rollers.
• the block adjustment so to speak, reduces the alternating bends from the inlet to the outlet of the machine relatively evenly.
• a directional triangle is defined as the smallest unit in a straightening machine. Such a directional triangle is shown in FIG. 5.
• the distance between two lower straightening rollers 9 is 2t, which is the value of the length of the straightening triangle, with the upper straightening roller 7 exactly symmetrical in the middle, ie at a distance t from the two lower Straightening rollers 9 is located.
• the thickness s of the straightening material 11 can be seen and the delivery or immersion depth Z is immersed by the upper straightening roller 7 down between the two lower straightening rollers 9 to produce the alternating bends in the straightening material 11.
• R indicates the radius of the straightening rolls 7 and 9 and p n is the bending radius to the neutral fiber of the straightening material.
• the directional triangle is selected according to the invention as a reference, wherein according to feature h) whose length 2t is displayed on the part to be straightened. Accordingly, reference will be made to the moving pictured part.
• Fig. 6 shows a part to be straightened and the values to be detected; 7 shows a table with the detected values and the parameters for calculating the offset;
• a part to be straightened 1 1 is shown, which has a "bridge-like" contour, namely a rectangular shape with a semicircular central recess with radius R.
• the part 11 has the thickness s.
• the directional triangle is in the example case of FIG. 6 65 mm, so that the dimension 2t is 65 mm.
• the side length ⁇ X of a surface part of the part 11 to be straightened is thus selected to be equal to the dimension 2t, that is to say the length of the straightening triangle.
• the initial and final width of the part 1 1 is 400 mm and its total length, which is measured from right to left, opposite to the passage direction indicated by arrow 13 of the part to be straightened 1 1 by the Generalerichtmaschine, is 800 mm.
• the width b is measured in each case in the middle of a partial area, which is shown by the dotted lines.
• the value bs 2 M is then related to the specific straightening machine characteristic value specified for the respective straightening machine, in the example case "35,000". This value results from the maximum value permitted for the leveler for bs 2 and ⁇ Fl which equals 400 N / mm 2 for the leveler considered.
• the maximum deflection value max X of the straightening machine or the associated roller mill is 0.4.
• the ratio 240/400 gives the value 0.6.
• the respective values bs 2 M / 35,000 of the maximum deflection max X and the yield point ratio are then calculated by multiplying the three factors of the offset value resulting at the corresponding width (see FIG. 7).
• these are only very small values (data in the table are accurate to 1 / 1,000 mm)
• the addition of the respective offset value to a basic setting value of the aiming beam leads, surprisingly, to considerably improved guide values.
• test sheet As a test sheet, the part 11 was used as shown in FIG. 6
• the default setting for the test sheet of 5 mm thickness with the Füeßsky ⁇ ? of 240 N / mm 2 was:
• Spout 5 mm (i.e., 0 mm immersed).
• the result of three experiments is shown in FIG.
• the tested part had an initial curvature of 12 mm in Experiment 1 and a result of a final curvature of ⁇ 0.4 mm by using the offset.
• the distances are to be chosen such that always an integer number n> 1 of the same partial surfaces of the side lengths ⁇ X lies within the directional triangle with the length 2t.
• side lengths ⁇ X remains a remnant left over, which is mediated either at the beginning of part and part end, or can be neglected on one side at sufficiently small Teii lake.
• the size of the Teii lake should be adapted to the complexity of the part to be straightened. In other words, when the contour or material quantity (recesses, holes) changes greatly, correspondingly small side lengths ⁇ X are selected in order to detect the changes in the value bs 2 sufficiently accurately for the calculation of the offset values.
• the results bs 2 are proportional to the corresponding width of the partial surface. In practical determination by measurement, of course, deviations in the measurement accuracy are present.
• the widths b and the thicknesses s are particularly easy to specify, if the straightening part was recorded with CAD. In order to determine the mean of the other values bs 2 M then usually only a small additional Hiifsprogramm suffices.
• the determined or calculated curves from the values bs 2 M are now used in conjunction with a mathematical model to determine the setting values, in particular, it is possible to deduce the maximum straightening force from the maximum of the values bs 2 M.
• the calculation model in addition to the consideration of the suspension behavior of the upper, movable roller mill can also be extended to the consideration of the suspension behavior of immovable
• Machine stand Furthermore, the number of mechanical straightening rolls can be taken into account when the part is shorter than the length of the entire straightening unit and the change in the suspension behavior at the inlet and outlet of the straightening material can also be taken into account.
• the determined offset value of the corresponding surface F 1 to F 12 or the directional triangle depicted thereon can be assigned and the basic setting of the standard value can be increased with the corresponding offset value, which leads to a significantly improved straightening result leads. Possibly. a force measurement is made, which serves to check the straightening forces and prevents overloading of the machine.
• the present invention provides a method of straightening parts in a roll leveling machine which, using the block feed, of the
• Straightening rolls in comparison with the individual adjustment of leveling rolls is more economical, simpler and more universal. Since many change bends are deliberately generated, the residual stress distribution is more favorable than with small-roll machines. On the other hand, only a few alternating bends are feasible, such as high-strength new materials, so the straightening roller can be adjusted so that a part of the straightening rollers is disengaged.
• parts also includes very long parts with a special contour or recesses and also unwound from the coil tapes, such as Löchbleche. The latter obtained by suitable punching or cutting their holes after unwinding from the coil and are then directed. Due to the ggfls. strong material differences over the length of the workpiece, the inventive method is particularly suitable for straightening these workpieces.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Straightening Metal Sheet-Like Bodies (AREA)
• Road Paving Machines (AREA)
• Wire Processing (AREA)

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• 2009
  • 2009-07-10 PL PL09780450T patent/PL2313215T3/pl unknown
  • 2009-07-10 AT AT09780450T patent/ATE534477T1/de active
  • 2009-07-10 WO PCT/EP2009/058849 patent/WO2010004037A2/fr active Application Filing
  • 2009-07-10 EP EP09780450A patent/EP2313215B1/fr active Active
  • 2009-07-10 DK DK09780450.4T patent/DK2313215T3/da active
  • 2009-07-10 CN CN200980126692.1A patent/CN102099132B/zh active Active
  • 2009-07-10 US US13/003,186 patent/US8789399B2/en active Active

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