Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
  • B21C47/32—Tongs or gripping means specially adapted for reeling operations
  • B21C47/326—Devices for pressing the end of the material being wound against the cylindrical wall of the reel or bobbin

Definitions

• the invention relates to a method and a device for reducing the lifting of the windings of a coil of metal strip.
• metallic strips are wound up into coils in order to simplify transport, storage and/or further processing.
• samples are taken from the strip wound into a coil, for example for quality assurance.
• a strip section of the coil is unwound, the sample is cut out and the rest of the strip section is rolled back onto the coil.
• the sampled section of strip is usually plastically deformed in such a way that it no longer has a curvature corresponding to its previous curvature in the coil.
• the remaining radius of curvature of the strip section is usually larger.
• the new curvature of the strip section results from the deformation of the strip during unwinding and winding and the cutting of the sample.
• the object of the invention is therefore to reduce lifting of the strip section after sampling and rewinding into a coil, so that this does not cause any further impairments, for example during storage, transport and further processing.
• At least one unwound strip section preferably at least the outermost winding of the coil, is plastically pre-deformed, in particular pre-bent, by means of a forming device after the sample has been taken in such a way that the lifting of the formed strip section is reduced compared to the lifting of the strip section that occurs when it is wound up without additional deformation .
• the strip section is deformed both plastically and elastically. The different proportions of deformation, or the ratio of plastic to elastic deformation, are determined by the material properties of the strip section and the deformation conditions during winding.
• the plastic part is increased compared to the elastic part. This then reduces the lifting of the deformed strip section from the underlying strip section of the coil.
• the forming device according to the invention therefore specifically counteracts the effect of the lifting of the coil after sampling and reduces, preferably eliminates, the lifting of the strip end from the coil, so that further transport of the coil is particularly preferably possible even without strapping, even in the case of high-strength and ultra-high-strength grades.
• the strip section is preferably pre-deformed or pre-bent to form a circular section with a curvature that is the same as or smaller than that of the strip section lying underneath in the wound coil.
• a reshaping of the strip section preferably takes place in the opposite direction to the reshaping of the strip section introduced during sampling. This preferred procedure restores a section of tape to its pre-sampling condition. Ideally, the properties of the section of strip are not influenced by the opposite reshaping, so that no negative effects occur in a subsequent processing operation due to the sampling of the section of strip.
• the deformation takes place when the coil is wound up after the sample has been taken. This simplifies the handling of the coil, since a additional unwinding and winding step with a forming step taking place in between is eliminated.
• the lifting of the strip section is reduced by >60%, preferably by >80%.
• the gap that remains, which is caused by the lifting, typically no longer represents an impairment in subsequent process steps. This has a particularly advantageous effect in the case of metallic strips with a thickness of more than 8 mm, preferably >16 mm.
• the deformation is preferably adapted to the coil diameter or the coil curvature during winding.
• the targeted setting of the curvature or diameter of a bending radius allows the strip section to be repositioned without force or to introduce targeted tension into the coil.
• the behavior of the strip during unwinding can be controlled by specifically adjusting the tension on the underlying strip sections of the coil. Stresses introduced that are too high can, for example, impede unwinding in a subsequent process step. Furthermore, a tension applied to the outside of the coil can stabilize and strengthen it.
• the object of the invention is achieved by a device having the features of claim 7 .
• the device has a bending tool for plastic deformation, in particular bending, of a sheet metal section and the bending tool is arranged between the sampling station and the coil or the winding station for plastic deformation, in particular bending, of a sheet metal section. This enables the strip section to be deformed preferably before and/or during the winding of the strip section onto the coil.
• the bending tool preferably has at least three rollers and at least two rollers ideally have a distance from one another that is greater than the diameter of the third roller.
• the third roll is preferably arranged in such a way that a metal sheet passed through the two gaps between the three rolls is curved. Due to the curvature of the strip section, in particular when the strip section is guided through the two gaps, the strip section can be plastically deformed.
• the tension required for the implementation can be applied here, for example, by means for winding up the coil and/or by means of appropriately arranged strip drivers, which are arranged before and/or after the bending tool.
• the arrangement or adjustment of the rollers of the bending tool is preferably provided in a variable manner for the purposeful changing of the introduced plastic deformation, in particular the bending radius of the sheet metal section.
• the variable adjustment of the rollers relative to one another facilitates the threading of the sheet metal section into the bending tool, and on the other hand, this allows the bending radius to be adapted to a changing radius of the coil, preferably continuously. This makes it possible to ideally adapt even long strip sections to a changing coil diameter during winding.
• the rollers of the bending tool preferably have a drive unit, preferably operated electrically, hydraulically or pneumatically, for conveying the strip. This simplifies the tape transport through the bending tool and an additional tape driver can be dispensed with.
• the drive unit can act on one or more rollers at the same time and can also have a gear and/or a clutch for decoupling the drive from the rollers.
• the drive unit is controlled or regulated in such a way that the tape running speed can be adapted to different conditions; For example, only the tape section off or to roll up or to reduce or increase the strip running speed in relation to the coil diameter.
• a drive unit preferably electrically, hydraulically or pneumatically operated, for adjusting the rollers.
• a drive unit for adjusting the position simplifies the variable setting of the resulting bending radius of the strip section.
• a linear motor in the form of a hydraulic cylinder can simply vary the gap and/or the curvature of the strip section by different adjustments of the middle roller.
• By changing the setting of the outer rollers it is also possible to vary the gap between the rollers and thus adapt the bending tool to different sheet thicknesses.
• the device is preferably designed and suitable for carrying out the method according to one of claims 1 to 6.
• Fig. 1 Overview sketches of the sampling station
• Fig 2 Detailed representations of the bending tool
• FIG. 1 a shows an overview sketch of a sampling station 2 with a bending tool 4 according to the invention.
• the strip section 11 When unwinding the coil 1 in the direction of the arrow, the strip section 11 first passes through the bending tool 4 and is then conveyed into the removal unit 21 for separating the sample.
• the bending rollers 41, 42, 43 are so far apart that no deformation is applied to the strip section or the winding 11.
• the driven rollers of the bending tool support the movement of the strip section in both possible directions of movement when the coil 1 is unwound or wound up.
• the rollers 41, 42, 43 of the bending tool 4 are set in such a way that the continuous strip section of the winding 11 undergoes plastic deformation.
• the band drivers 5 are closed and transport the band section through the bending tool 4 .
• the hydraulic cylinder acting on the middle roller 43 adapts the applied deformation or curvature to the diameter R of the coil.
• FIG. 2a Different possible embodiments of the bending tool 4 are shown in Figures 2 a) to c).
• the rollers 41, 42, 43 of the bending tool 4 are fixed and the strip section is always deformed in accordance with the preset curvature as it passes through the bending tool.
• the gap between the rollers 41, 42, 43 and, at the same time, the radius of curvature of the section of strip passing through can be varied by means of a linear drive, which acts on the middle roller 43, as shown in FIG. 2b).
• the radius of curvature can only be adjusted in connection with the gap thickness.
• both outer rollers 41, 42 can be moved variably in relation to one another in addition to the middle roller. In this arrangement, both the gap and the bending radius can be variably adjusted independently of one another. This allows the bending tool to be adapted to different strip thicknesses.
• FIG. 3 shows coils in different states after winding, with and without a bending tool 4.
• a strip section is unwound and wound up again.
• the strip section is lifted off the underlying windings by the variable distance s.
• the maximum outside diameter of the coil increases by the amount r z .
• the strip section has been deformed with a bending tool 4 according to the invention during winding. As a result, the lifting is reduced here compared to the lifting in FIG. 3a).
• the outside diameter R of the coil 1 is also reduced compared to the coil 1 in FIG. 3a).
• an outside diameter R of the coil 1 is set, which essentially corresponds to the outside diameter of the coil 1 in the as-delivered state.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Winding, Rewinding, Material Storage Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (3)

Citations (3)

• 2020
  • 2020-11-13 DE DE102020130005.0A patent/DE102020130005A1/de not_active Withdrawn
• 2021
  • 2021-08-16 TW TW110130124A patent/TW202218762A/zh unknown
  • 2021-10-15 WO PCT/EP2021/078638 patent/WO2022100962A1/de active Application Filing

Patent Citations (3)

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