WO2012119166A1 - Process and device for producing a metallic strip - Google Patents

Abstract

In a process and a device for producing a metallic strip (2) having at least two strips (24, 24', 25, 26) of differing thickness running in the longitudinal direction of the strip (2) with the aid of rollers (10, 16), between which the strip (2) is passed and in the process a strip (24, 24'') of reduced thickness is produced by a rolling operation, working rollers (16) mounted on a planetary gear (9) are moved in the direction (21) counter to the conveying direction (20) of the strip (2) during the rolling operation.

Description

 Method and device for producing a metallic strip

The invention relates to a method for producing a metallic strip having at least two strips of different thickness running in the longitudinal direction of the strip, by means of rollers, between which the strip is made, thereby producing a strip of reduced thickness by means of a rolling process.

The invention further relates to a device for producing a metallic strip having at least two strips of different thickness running lengthwise of the strip, with rollers between which the strip is made producing at least one strip of reduced thickness by rolling, and a drive for conveying of the tape through the rollers.

Such a method and such a device are known for example from DE 101 56 087 A1. However, there is the problem that when rolling such bands, the band is formed during forming both in length and in width. While forming in width is desirable in these instances, the proportion of forming in length poses significant problems, since the larger gauge strip which is not or less formed undergoes no or less elongation than the more formed strip, which leads to distortions or to a corrugation of the band, so that the band then has to be evenly smoothed or straightened.

The invention is therefore based on the object to provide a method and an apparatus in which there are fewer distortions or undulations.

This object is achieved in a method of the type mentioned above in that mounted on a planetary work rolls are moved during the rolling process in the direction of conveyance of the belt opposite direction. In a device of the type mentioned, this object is achieved in that a planetary gear, are mounted on the work rolls, a direction of rotation, which is opposite to the conveying direction of the tape.

In the invention, the at least one strip is rolled with a planetary gear opposite to the direction of movement of the belt. This has the consequence that the rolled strip is formed primarily in the width and at a much lower compared to the prior art share in the length, so that there are significantly fewer warps or corrugations of the tape. With the invention, not only bands can be produced, which consist essentially of only two strips of constant, different thickness but also those in which individual strips, viewed transversely to the conveying direction of the belt, have a step-shaped, in any case discontinuously increasing or decreasing strength , In addition, tapes can be made in which, for example, one or more grooves of different width or thickness are rolled into a tape.

With the invention, not only strips with strips of piecewise constant thickness can be made across the strip running direction, but also strips with concave recesses or continuous thickness transitions. All you have to do is use a suitably shaped work roll and the matching sun and planet wheels.

Moreover, the invention can be used not only for processing originally flat bands of constant thickness, but also for further processing semi-finished bands or profiles in which at least one strip of different thickness running in the longitudinal direction of the profile is produced by means of rollers, between which Profile performed while a strip of reduced strength is generated by a rolling process. In order to allow both the flow of the metal in the width and to provide an exact transition between two adjacent strips of different thickness, is preferably provided in the invention that before rolling at least one puncture, preferably a wedge-shaped groove in the region of Gradation between two strips is made. This puncture can be made either by plastic deformation of the band, for example with a wheel pushing the puncture into the band, or by a machining operation, for example with a milling cutter or a planer.

In order to increase the service life of the work rolls subject to severe deformation, in a further preferred embodiment of the invention, after the creation of this wedge-shaped recess, each work roll can be easily freed from the flank. This reduces both the friction and the pressure on the edges of the work rolls.

In a preferred embodiment of the invention, a targeted manipulation of the thickness of the strip in the direction of tape travel is possible. For this purpose, it is necessary to control the roll gap accurately via suitable feed devices as well as to precisely synchronize the punctures with the infeed of the planetary rollers, wherein the belt speed must be taken into account in each case. The forming process _. subsequent calibration rollers must be readjusted constantly in this case, in which case only the rolled thinner strip is re-rolled.

In another preferred embodiment of the invention, the strip may be rolled in at least two successive rolling operations. This can be advantageous, for example, when the strip to be rolled is either relatively wide or the strip thickness to be reduced is very large, so that a two-stage or multi-stage rolling process is advantageous. If a gradation is to be made on either side of the belt, in one embodiment of the invention, the belt may be rolled with two work rolls disposed on opposite sides of the belt.

After primary deformation by the work rolls moving counter to the direction of strip travel, a corresponding straightening roller pair may be provided in a further preferred embodiment of the invention. These straightening rollers are said to reduce the minimum ripple after engagement of the work roll to the desired profile of requirements. In order to support the high deformation in the area of the work rolls, a device for partial heating of the strip in the region of the strip to be formed can be provided. In a preferred embodiment of the invention, for example, this heating can be effected inductively. Further preferred embodiments of the invention are the subject of the remaining dependent claims.

Further features and advantages of the invention will become apparent from the following description of preferred embodiments of the invention with reference to the accompanying drawings. It shows:

1 is a schematic diagram of a plant with a rolling device according to the invention with subsequent forming plant,

FIG. 2 shows a schematic diagram of a system with a rolling device according to the invention for producing printed circuit boards, FIG.

 Fig. 3 is a schematic picture of a plant with a rolling device according to the invention in

Coil-to-coil operation,

4 shows a schematic picture of a plant with a rolling device according to the invention, in which the thickness reduction takes place on a preformed profile,

5 shows a schematic picture of a plant with a rolling device according to the invention, wherein the profiles are rolled from boards as starting material,

6 shows a schematic picture of a plant with a rolling device according to the invention, in which preformed profiles are rolled down at a certain point with reduced thickness,

 7 shows a first embodiment of a rolling device according to the invention in an oblique view, FIG. 8 shows a plan view of the embodiment according to FIG. 7, FIG.

9 shows a cross section through the embodiment of Fig. 7,

10 is a detail view of a puncture and an exemption of a work roll,

 11 possible forms of the work rolls with the exemplary installation form in a planetary gear,

 12 shows a longitudinal section through a second embodiment of a rolling device according to the invention,

13 is a plan view of the embodiment of Fig. 12,

 14 shows a longitudinal section through a third embodiment of a rolling device according to the invention,

 15 shows two embodiments of tools for producing a puncture,

16 shows a third embodiment of a tool for producing a recess, FIG. 17 shows a fourth embodiment of a rolling device according to the invention in plan view, FIG. 18 shows a fifth embodiment of a rolling device according to the invention in plan view, FIG

 Fig. 20 shows a seventh embodiment of a rolling device according to the invention in a sectional view.

In Fig. 1, a system with a rolling device 1 according to the invention is shown schematically. A metallic strip 2, for example a steel strip, is withdrawn from a spool 3 and fed to the rolling device 1 with a drive 34 through an upstream heating station 4. After the rolling device 1, the rolled strip 2 passes through a cooling station 5 and then a profiling device 6, in which the rolled strip 2, for example, in a U-shaped or box-shaped cross-sectional profile 2 'is formed. The profile 2 'is then cut in the illustrated embodiment with a saw 7 in profile pieces 8.

With the invention but also sheets, profiles, sinkers or other parts can be processed with a limited length, which are supplied to the rolling device individually, and _

 - 0 - which can also be referred to as a band within the scope of the invention.

In Figs. 2 to 6 further applications of the device according to the invention are shown. The device according to the invention can be at the beginning of a forming section (FIG. 1), but also at its end (FIG. 4), or else at a suitable point within the profiling or forming section (not shown). In either case, direct coil-to-coil (Figure 3), i. Plants in which a tape 2 withdrawn from a coil 3 and the processed tape 2 is then rewound onto a reel 3 ', or coil-to-board (Fig. 2) modes possible. The supply of the device according to the invention with the metallic Vörmaterial but must not necessarily take place via a coil 3. Also conceivable are the direct processing of individual boards (FIG. 5) or semi-finished open profiles (FIG. 6).

FIGS. 7 to 9 show a first exemplary embodiment of a rolling device 1 according to the invention, which has a planetary gear 9 and a counter-roller 10. As can be seen in particular in FIG. 9, the planetary gear 9 consists of two planet carriers 11, 12, which are non-rotatably connected to a drive shaft 14 by means of a feather key 13. Between the two planet carriers 11, 12 15 work rolls 16 are rotatably mounted on bolts. Radially within the work rolls 16 a Abrollring 17 and a support ring 18 are arranged, wherein the support ring 18 via the feather key 13 rotatably connected to the drive shaft 14, whereas the Abrollring 17 is slidably against the support ring 18 rotatable. The work rolls 16 are also supported on the outer surface 19 of the Abrollrings 7 so that they can slide on this. When the tape 2 is performed in the direction of arrow 20 between the planetary gear 9 and the counter roll 10, the planetary gear 9 rotates with the work rolls 16 in the direction of arrow 21 and thus against the direction of movement of the belt 2. The counter roll 10, however, turns in Direction of the arrow 22 with the band 2 with. The work rolls 16 rotate while they roll on the belt 2, in the direction of the arrow 23 and thus in the opposite direction of the planetary. 9

The work rolls 16, in the embodiments shown in FIGS. 7, 8, 9, 12 and 13, each produce a groove or strip 24 of lesser thickness between two larger thickness strips 25, 26. However, the thickness and width of the strips 24, 25, 26 is arbitrary, whereby the number of strips 24 of lesser thickness and the strips 25, 26 of greater thickness may be arbitrary. Thus, for example, two or more grooves or strips 24 of lesser thickness may be arranged between two or more strips 25, 26 of greater thickness, with a strip 24 of lesser thickness also at the edge of the strip 2 can be arranged. For example, it may also be that only one strip 24 of lesser thickness is arranged adjacent to a single strip 25 of greater thickness.

Since the planet gear 9 is rotated against the direction of movement of the belt 2, the displaced by the work rolls 16 material on the one hand to the side, on the other hand, but also displaced against the direction of movement of the belt 2, so that it is not or only to a small extent to an extension of the rolled strip 24 in the longitudinal direction or conveying direction 20 of the belt 2 comes, whereby corrugations or distortions of the belt 2 avoided or, in any case, be reduced compared to the prior art.

Immediately after the planetary gear 9 and the counter-roller 10, a profiled straightening roller 27 may be arranged with a smooth counter-roller 28, which smooth out unevenness in the rolled profile. In front of the planetary gear 9, in a preferred embodiment of the invention, a tool for generating recesses 29, 30 may be arranged. These wedge-shaped recesses 29, 30, as well as their position to the work roll 16 exemplified are shown in Fig. 10, allow or promote the flow of metal transverse to the tape direction and provide an exact edge between the strips 24, 25 and 26. The tools can the recesses 29, 30 without cutting, that is, by plastic deformation of the belt, or produce by machining. A non-cutting production of a puncture can, for example, by means of a wheel 31 (see Fig. 16), a machining production, for example by means of a planer 32 or a milling cutter 33 (both Fig. 15). It can also be combined with each other tools to produce punctures in the desired shape and size. The necessary in the case of a machining production of the punctures 29, 30 removal of the chips by suitable measures, such as. Rinse or blow.

In the embodiment shown in FIGS. 7 to 9, a single planet gear 9 with a counter roll 10 is used to produce a groove or strip 24 of reduced thickness. In the embodiment shown in FIGS. 12 and 13, two substantially equal planetary gears 9 are used, each with a counter-roller 10, either to produce a wider groove 24 or around the entire groove 24 or a partial width of the groove 24 during the rolling process To roll the second planet 9 deeper than during the rolling process with the first planet 9th

In Fig. 14, a third preferred embodiment of the invention is shown in which two planet wheels 9 are arranged on opposite sides of the belt 2, which respectively grooves or strips 24, 24 'on opposite sides of the belt 2. In this embodiment of the invention, two profiled straightening rollers 27 are preferably used to smooth the rolled profile.

In Fig. 17, a fourth preferred embodiment of the invention is shown in which two planet gears 9 are offset transversely and successively in the conveying direction 20 against each other to roll as shown here a particularly wide, reduced thickness strip 24. Once again, the different possibilities for attaching the tools 32 for producing the punctures 29, 29 ', 30 are shown. The groove 29 'can be generated both immediately before (solid line) and at the height of the first punctures (dotted line), in which case the desired broadening of the band must be taken into account accordingly.

In Fig. 18, a fifth preferred embodiment of the invention is shown in which three three strips 24 are produced with a total of three planet wheels with lesser strength, which lie between strips 25 and 26 of greater strength.

The first planetary gear 9 seen in the tape running direction 20 is arranged alone on a drive shaft 14 and generates a first middle strip 24 with a lower thickness. After the first planetary gear 9 follows a first profiled straightening roller 27 to smooth the rolled profile. After the first straightening roller 27 is followed by a further drive shaft 14, on which now two planet wheels 9 are arranged, which each produce a further groove 24 in the form of a strip of reduced thickness. After the second drive shaft 14 with the two planetary gears 9 is followed by a further profiling roller 27, which smoothes all three previously produced strips 24 and the adjacent strips 25, 26. By way of example, it is further illustrated in FIG. 18 that the recesses 29, 30 for the two strips 24 lying down in FIG. 18 can be produced simultaneously with adjacent tools 32. For the recesses 29, 30 of the top in Fig. 18 strip 24 tools 32 are arranged immediately in front of the relevant planetary gear 9. In Fig. 11 different rolling elements for the work rolls and their exemplary installation in a planetary gear 9 are shown. It should be noted that the wear of the work rolls with increasing deviation from the cylindrical shape (Fig. 11 b, c, d) increases. In order to take account of this increased wear, a cooling lubricant is supplied in a suitable manner. The cone angle or the radius of curvature of the barrel roller according to FIG. 11d is largely unrestricted, even if the cone angle of the cone roller is shown exaggeratedly large for purposes of illustration. In the case of Fig. 11 c, the wear can be reduced by two suitable punctures in front of the tool roll. _

In Fig. 19, the use of both a planetary gear 9 is shown with cylindrical work rolls and one with conical work rolls. It is first a metal strip with an unchanged thick strip 25 and a plane-parallel thinner edge strip 24 is produced. For this purpose, only one puncture 29 is generated this time. In the subsequent processing step, the thicker strip 25 is made into a thicker strip 26 and a strip of continuously decreasing thickness 38 at the strip edge by means of a tapered roller planetary gear (cone angle exaggerated for illustrative purposes). In both cases, it is about the targeted shaping of the band edge. The use of a tapered roller planetary gear is by no means limited to the band edge. In any case, in the illustrated application, no pricking is required for the strip 38.

Fig. 20 shows a further preferred embodiment of the rolling apparatus according to the invention, in which by means of the planetary gear 9 and suitable drives 39, 40 for advancing the planetary gear as well as the preceding puncture tools 31, 32, 33, a plane-parallel thickness-reduced strip 24 with different in the direction of the belt Thickness is produced. For this purpose, the roll gap between the planetary rollers and counter-roller must be adjusted in time dimensionally accurate. In addition, the insertion depth of the puncturing tool must be synchronized with the belt speed 20 and the position of the planetary gear, so that the punctures always have the correct depth.

The rolling with different depths in the direction of tape travel is indeed known in principle, but only over the entire bandwidth with an exclusive stretch of the tape. The major improvement in this respect is the rolling of a strip with simultaneous broadening of the band, which was previously not possible. In this way, you can thus produce metal strips with over the length of different widths, which for example in bending in the region of the largest bending moment a locally higher area moment of inertia can be generated by the metal is placed at these locations farther away from the bending line.

Claims

 Claims: 1. A method for producing a metallic strip (2) having at least two strips (24, 24 ', 25, 26) of different thickness extending in the longitudinal direction of the strip (2) by means of rollers (10, 16) between which the strip ( 2) and thereby a strip (24, 24 ') of reduced thickness is produced by a rolling process, characterized in that on a planetary gear (9) mounted work rolls (16) during the rolling process in the conveying direction (20) of the strip (2) opposite direction (21) are moved. 2. The method according to claim 1, characterized in that the work rolls (16) are cylindrical. 3. The method according to claim 1, characterized in that the work rolls (16) have a continuously increasing and / or decreasing diameter in the axial direction, preferably conical. 4. The method according to claim 1, characterized in that the work rolls (16) have concave recesses. 5. The method according to claim 1, characterized in that the work rolls (16) have a convex contour, preferably barrel-shaped. 6. The method according to any one of claims 1 to 5, characterized in that before rolling at least one puncture (29, 30) in the region of a gradation between two strips (24, 24 ', 25, 26) is produced. 7. The method according to claim 6, characterized in that the recesses (29,30) are wedge-shaped and for the two flank angle (a, ß) applies: a <ß and 0 ° <a <15 ° and a <ß <50 °, wherein the larger flank angle (β) is on the side of the strip (24, 24 ') with the lower thickness. 8. The method according to claim 6 or 7, characterized in that the recesses (29,30) the work rolls (16) cut free, so before rolling a gap (s) of preferably 0.1 mm to 1 mm between the work roll (16). and thicker strip (25,26) remains. 9. The method according to any one of claims 6 to 8, characterized in that the puncture (29, 30) by plastic deformation of the strip (2) is produced. 10. The method according to any one of claims 6 to 9, characterized in that the recess (29, 30) is made by machining. 11. The method according to claim 10, characterized in that the resulting chip is removed by rinsing or blowing. 12. The method according to any one of claims 1 to 11, characterized in that the band (2) is formed in at least two rolling operations. 13. The method according to claim 12, characterized in that the strip is rolled in at least two rolling operations with counter to the conveying direction (20) of the strip (2) moving work rolls (16). 14. The method according to any one of claims 1 to 13, characterized in that the strip (2) with two on opposite sides of the strip (2) arranged work rolls (16) is rolled. 15. The method according to any one of claims 1 to 14, characterized in that the strip (2) after rolling by straightening rollers (27, 28) is guided. 16. The method according to any one of claims 12 to 15, characterized in that the band (2) is rolled in laterally offset areas. 17. The method according to any one of claims 12 to 16, characterized in that the strip (2) is rolled in a subsequent rolling operation is thinner than in a preceding rolling. 8. The method according to any one of claims 1 to 17, characterized in that a strip (24, 24 ') with reduced strength on both sides of strips (25, 26) is limited with greater strength. 19. The method according to any one of claims 6 to 18, characterized in that two or more punctures are made either all at the beginning in a single operation or in each case only immediately before each rolling process. 20. The method according to any one of claims 1 to 19, characterized in that the belt (2) after each individual rolling operation by straightening rollers (27,28) is guided. 21. The method according to claim 1 to 20, characterized in that the rolling process subjected to the region is heated prior to the rolling process. 22. The method according to claim 21, characterized in that the heating takes place inductively. 23. The method according to claim 21 or 22, characterized in that the strip (2) is cooled after rolling and optionally after straightening. 24. The method according to any one of claims 1 to 23, characterized in that the supplied strip (2) is already at least partially profiled or preformed. 25. The method according to any one of claims 1 to 24, characterized in that a strip (24) is produced with changing in the direction of tape travel strength. 26. The method according to claim 25, characterized in that the roll gap between the planetary gear (9) and counter-roller (10) is set accurately via a drive (39). 27. The method according to claim 25 or 26, characterized in that the depth of a puncture (29, 30) is set accurately via a drive (39). 28. The method according to any one of claims 25 to 27, characterized in that the production of the recess (29, 30) is synchronized with the setting of the roll gap on the tape speed with the aid of the drives (39). 29. The method according to any one of claims 1 to 28, characterized in that after the rolling process, the rolling stock is further formed. 30. Apparatus for producing a metallic strip (2) having at least two strips (24, 24 ', 25, 26) extending in the longitudinal direction of the strip (2) Starch having rollers (10, 16) between which the belt (2) is made, thereby producing at least one strip (24, 24 ") of reduced thickness by rolling, and a drive for conveying the belt (2) through the rollers (10, 16), characterized in that a planetary gear (9) are mounted on the work rolls (16), a direction of rotation (21) which is opposite to the conveying direction (20) of the band (2). 31. The device according to claim 30, characterized in that it comprises a positive drive (34) which pushes the band (2) through the device. 32. Apparatus according to claim 30 or 31, characterized in that two or more planet wheels (9) in the conveying direction (20) of the belt (2) are arranged one behind the other. 33. Device according to one of claims 30 to 32, characterized in that two or more planet wheels (9) transversely to the conveying direction (20) of the belt (2) are arranged on a shaft. 34. Device according to one of claims 30 to 33, characterized in that two or more planetary gears (9) transversely to the conveying direction (20) of the belt (2) on several in the conveying direction (20) successive waves are arranged side by side. 35. Device according to one of claims 30 to 34, characterized in that two planet gears (9) on opposite sides of the belt (2) are arranged. 36. Device according to one of claims 30 to 35, characterized in that in front of the planetary gear (9), when a plurality of planetary gears (9) are provided one behind the other in front of one, preferably the first planetary gear (9) a tool (31, 32, 33 ) to the Generating a puncture (29, 30) is arranged. Apparatus according to claim 36, characterized in that in front of each planetary gear (9) which does not run exactly in the track of a planetary gear planet (9), a tool (31, 32, 33) for generating a recess (29, 30) is arranged , 38. Apparatus according to claim 36 or 37, characterized in that the tool for producing a puncture (29, 30) is a wheel (31). 39. Device according to claim 36 or 37, characterized in that the tool for producing a recess (29, 30) is a cutting tool, for example a milling cutter (33) or a planer (32). 40. Device according to one of claims 30 to 39, characterized in that the work rolls (16) are supported radially inwardly on a Abrollring (17). 41. Apparatus according to claim 40, characterized in that the Abrollring (17) is slidably mounted on a support ring (18) which is non-rotatably connected to a drive shaft (14) of the planet gear (9). 42. Device according to one of claims 30 to 41, characterized in that after each or after the last planet gear (9) straightening rollers (27, 28) are arranged. 43. Device according to one of claims 30 to 42, characterized in that a roll gap between the work rolls (16) and a counter roll (10) or opposing work rolls (16) is adjustable during the rolling process. 44. Apparatus according to claim 43, characterized in that the roll gap via an Anrieb (39) on the planet gear (9) is adjustable. 45. Apparatus according to claim 43 or 44, characterized in that the penetration depth of the tool (31, 32, 33) for producing the recess via a drive (40) is adjustable. 46. Device according to one of claims 43 to 45, characterized in that the drives (39, 40) via the tape speed (20) are synchronized.