EP2683506B1 - Process and device for producing a metallic strip - Google Patents

Description

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 an apparatus for producing a metallic strip having at least two extending in the longitudinal direction of the strip strips of different thickness with rollers between which carried out the band during operation and thereby by rolling at least one strip of reduced thickness is generated, wherein work rolls at least a planet gear are mounted and the planetary gear has a direction of rotation, which is opposite to the rolling direction of the conveying direction of the tape, and with a drive for conveying the tape through the rollers.

Such a method is for example from the DE 101 56 087 A1 known. 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 smoothed or straightened.

A generic device is for example from the IT-B-1236307 known.

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 by a rotation of the planet during the rolling process in the direction opposite to the conveying direction of the belt direction. In a device of the type mentioned, this object is achieved in that a tool for generating a groove is arranged in the conveying direction of the belt in front of the planetary gear. 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, seen transversely to the conveying direction of the belt, a step-shaped, in any case discontinuously increasing or decreasing strength exhibit. 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.

In addition, 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 is longitudinal The profile of the running strip of different thickness is produced by means of rollers, between which the profile is carried out while a strip of reduced strength is produced by a rolling process.

In order to enable both the flow of the metal in the width as well as 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 recess in the region of a gradation is made between two strips. 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 rollers following the forming process 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 For example, be advantageous if the strip to be rolled either relatively wide or the thickness of the strip to be reduced is very large, so that a two- or multi-stage rolling process is advantageous.

If a step is to be made on either side of the belt, in one embodiment of the invention, the belt can be rolled with two work rolls arranged 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.

Fig. 1

ein schematisches Bild einer Anlage mit einer erfindungsgemäßen Walzvorrichtung mit anschließender Umformanlage,

Fig. 2

ein schematisches Bild einer Anlage mit einer erfindungsgemäßen Walzvorrichtung zur Herstellung von Platinen,

Fig. 3

ein schematisches Bild einer Anlage mit einer erfindungsgemäßen Walzvorrichtung im Coil-to-Coil Betrieb,

Fig. 4

ein schematisches Bild einer Anlage mit einer erfindungsgemäßen Walzvorrichtung, bei der die Dickenreduktion auf einem vorgeformten Profil erfolgt,

Fig. 5

ein schematisches Bild einer Anlage mit einer erfindungsgemäßen Walzvorrichtung, wobei die Profile aus Platinen als Ausgangsmaterial gewalzt werden,

Fig. 6

ein schematisches Bild einer Anlage mit einer erfindungsgemäßen Walzvorrichtung, bei der vorgeformte Profile an einer bestimmten Stelle dickenreduziert ausgewalzt werden,

Fig. 7

eine erste Ausführungsform einer erfindungsgemäßen Walzvorrichtung im Schrägriss,

Fig. 8

eine Draufsicht auf die Ausführungsform gemäß Fig. 7,

Fig. 9

einen Querschnitt durch die Ausführungsform von Fig. 7,

Fig. 10

eine Detailansicht eines Einstichs und einer Freistellung einer Arbeitswalze,

Fig. 11

mögliche Formen der Arbeitsrollen mit der beispielsweisen Einbauform in einem Planetenrad,

Fig. 12

einen Längsschnitt durch eine zweite Ausführungsform einer erfindungsgemäßen Walzvorrichtung,

Fig. 13

eine Draufsicht auf die Ausführungsform von Fig. 12,

Fig. 14

einen Längsschnitt durch eine dritte Ausführungsform einer erfindungsgemäßen Walzvorrichtung,

Fig. 15

zwei Ausführungsformen von Werkzeugen zum Herstellen eines Einstichs,

Fig. 16

eine dritte Ausführungsform eines Werkzeugs zum Herstellen eines Einstichs,

Fig. 17

eine vierte Ausführungsform einer erfindungsgemäßen Walzvorrichtung in Draufsicht,

Fig. 18

eine fünfte Ausführungsform einer erfindungsgemäßen Walzvorrichtung in Draufsicht,

Fig. 19

eine sechste Ausführungsform einer erfindungsgemäßen Walzvorrichtung in Draufsicht und

Fig. 20

eine siebente Ausführungsform einer erfindungsgemäßen Walzvorrichtung in Schnittdarstellung.

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:

Fig. 1

a schematic picture of a plant with a rolling device according to the invention with subsequent forming plant,

Fig. 2

a schematic picture of a plant with a rolling device according to the invention for the production of boards,

Fig. 3

a schematic picture of a plant with a rolling device according to the invention in the coil-to-coil operation,

Fig. 4

a schematic image of a plant with a rolling device according to the invention, in which the reduction in thickness is carried out on a preformed profile,

Fig. 5

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

Fig. 6

a schematic image of a system with a rolling device according to the invention, are rolled in the preformed profiles at a certain point thickness reduced,

Fig. 7

a first embodiment of a rolling device according to the invention in an oblique angle,

Fig. 8

a plan view of the embodiment according to Fig. 7 .

Fig. 9

a cross section through the embodiment of Fig. 7 .

Fig. 10

a detailed view of a puncture and an exemption of a work roll,

Fig. 11

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

Fig. 12

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

Fig. 13

a plan view of the embodiment of Fig. 12 .

Fig. 14

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

Fig. 15

two embodiments of tools for producing a puncture,

Fig. 16

a third embodiment of a tool for producing a puncture,

Fig. 17

A fourth embodiment of a rolling device according to the invention in plan view,

Fig. 18

a fifth embodiment of a rolling device according to the invention in plan view,

Fig. 19

a sixth embodiment of a rolling device according to the invention in plan view and

Fig. 20

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

In Fig. 1 schematically a plant with a rolling device 1 according to the invention is shown.

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

In the Fig. 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 the end ( Fig. 4 ), or at a suitable location within the profiling or forming section (not shown). In any case, direct coil-to-coil ( Fig. 3 ), ie installations in which a tape 2 is withdrawn from a reel 3 and the processed tape 2 is then rewound onto a reel 3 ', or coil-to-board ( Fig. 2 ) Operating modes possible. However, the supply of the device according to the invention with the metallic starting material does not necessarily have to take place via a coil 3. Also conceivable are the direct processing of individual boards ( Fig. 5 ) or semi-finished open profiles ( Fig. 6 ).

In the Fig. 7 to 9 a first embodiment of a rolling device 1 according to the invention is shown, which has a planetary gear 9 and a counter-roller 10. The planetary gear 9 is made, as in particular in Fig. 9 can be seen from two planet carriers 11, 12, which are non-rotatably connected by means of a feather key 13 with a drive shaft 14. 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 generate in the in the Fig. 7 . 8th . 9 . 12 and 13 illustrated embodiments each have a groove or a strip 24 of lesser thickness between two strips 25, 26 of greater strength. 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 can be arranged between two or more strips 25, 26 of greater thickness, wherein a strip 24 of lesser thickness can also be arranged on the edge of the strip 2. 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 is displaced on the one hand to the side, on the other hand, but 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, a tool for generating recesses 29, 30 can be arranged according to the invention. These wedge-shaped recesses 29, 30, as well as their position to the work roll 16 are in Fig. 10 shown, enable or promote the flow of the metal transversely to the belt direction and provide an exact edge between the strips 24, 25 and 26. The tools, the recesses 29, 30 without cutting, that is, by plastic deformation of the belt, or machined produce. A non-cutting production of a puncture can be done for example by means of a wheel 31 (see Fig. 16 ), a machining example using 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 via suitable measures, such as. B. rinsing or blowing.

In the in the FIGS. 7 to 9 In the embodiment shown, a single planet gear 9 with a counter-roller 10 is used to produce a groove or strip 24 of reduced thickness. In the in the Figures 12 and 13 illustrated embodiment, two largely the same planetary gears 9, each with a mating roll 10 used, either to produce a wider groove 24 or to roll the entire groove 24 or a portion of the groove 24 during the rolling process with the second planetary gear 9 deeper than during the rolling process with the first planetary. 9

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 produce 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 planetary 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 nine 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 follows a further profiling roller 27, which smoothes all three previously produced strips 24 and the adjacent strips 25, 26.

Exemplary is in Fig. 18 further illustrated that the recesses 29, 30 for the two (in Fig. 18 ) lying down strip 24 can be made simultaneously with adjacent tools 32. For the punctures 29, 30 of in Fig. 18 overhead 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. 11b, c, d ) increases. 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 unlimited, even if the cone angle of the example of the tapered roller for illustration purposes is exaggerated. In the case Fig. 11c 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 with cylindrical work rolls and a cone-shaped work rolls is shown. 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 tapered roller planetary gear (cone angle is exaggerated for illustrative purposes) is used to make the thicker strip 25 into a thicker strip 26 and a strip of continuously decreasing thickness 38 at the strip edge. 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 feeding the planetary gear as well as the preceding puncture tools 31, 32, 33, a plane-parallel thickness-reduced strip 24 is made in the running direction of the belt of different thickness. 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 puncture 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 locally higher area moment of inertia can be generated by the metal is placed further away from the bending line at these points.

In general, it is mentioned that the method can be particularly distinguished when the resulting chip is removed by rinsing or blowing.
In general it is mentioned that the method can be particularly distinguished when the strip is guided by straightening rolls after rolling.
In general, it is mentioned that the method can be particularly distinguished when the strip is rolled in a subsequent rolling process thinner than in a preceding rolling.
In general, it is mentioned that the method can be particularly distinguished when two or more punctures are made either at the beginning in one operation or only immediately before each rolling operation.

In general, it is mentioned that the method can be particularly distinguished when the strip is guided through straightening rolls after each individual rolling operation.
In general, it is mentioned that the method can be particularly distinguished when the area subjected to the rolling process is heated before the rolling process.
In general it is mentioned that the method can be particularly distinguished when the heating takes place inductively.
In general it is mentioned that the method can be particularly distinguished when the strip is cooled after rolling and optionally after straightening.
In general, it is mentioned that the method can be particularly distinguished when the supplied strip is already at least partially profiled or preformed.
In general, it is mentioned that the method can be particularly distinguished when the rolling gap between the planetary gear and counter-roller is set precisely to measure via a drive.
In general it is mentioned that the method can be particularly distinguished when the depth of a puncture is accurately adjusted via a drive. In general, it is mentioned that the method can be particularly distinguished when the production of the puncture is synchronized with the adjustment of the roll gap via the belt speed using the drives.
In general, it is mentioned that the method can be particularly distinguished if the rolling stock is further formed after the rolling process.

In general, it is mentioned that the device can be particularly distinguished if it contains a positive drive, which pushes the band through the device.
In general it is mentioned that the device can be particularly distinguished when straightening rolls are arranged after each or after the last planetary wheel.

In general, it is mentioned that the device can be particularly distinguished when the roll gap is adjustable via an antrieb on the planetary gear.
In general, it is mentioned that the device can be particularly distinguished when the penetration depth of the tool for producing the recess can be adjusted via a drive.
In general it is mentioned that the device can be particularly distinguished when the drives are synchronized by the tape speed.

Claims (20)

1. Process for manufacturing a metal band (2) with at least two strips (24, 24', 25, 26) running in a longitudinal direction of the band (2) of differing thickness using rollers (10, 16), between which the band (2) is guided through and thereby a strip (24, 24') of reduced thickness is generated by a rolling process, characterised in that working rollers (16) supported on a planetary gear (9) are moved by rotating the planetary gear (6) in the rolling process in the direction (21) opposite to the conveying direction (20) of the band (2).
2. Process according to claim 1, characterised in that the working rollers (16) are cylindrical or that the working rollers (16) exhibit a continuously increasing or decreasing diameter in the axial direction, are preferably conical, or the working rollers (16) exhibit concave recesses, or that the working rollers (16) embody a convex contour, and are preferably barrel-shaped.
3. Process according to any one of claims 1 to 2, characterised in that, before rolling, at least one cut-in (29, 30) is produced in the region of a step between two strips (24, 24', 25, 26).
4. Process according to claim 3, characterised in that the cut-ins (29, 30) are wedge-shaped and α ≤ β and 0° ≤ α ≤ 15° and α ≤ β ≤ 50° apply for both flank angles (α, β), wherein the greater flank angle (β) is situated on the side of the strip (24, 24') with the smaller thickness.
5. Process according to claim 3 or 4, characterised in that the cut-ins (29, 30) release the working rollers (16), so that in front of the roller a gap (s) remains of preferably 0.1 mm to 1 mm between the working roller (16) and thicker strip (25, 26).
6. Process according to any one of claims 3 to 5, characterised in that the cut-in (29, 30) is produced by plastic deformation of the band (2) or removes chips.
7. Process according to any one of claims 1 to 6, characterised in that the band (2) is deformed in at least two rolling processes, more particularly rolling with the working rollers (16) moved in the direction opposite to the conveying direction (20) of the band (2).
8. Process according to any one of claims 1 to 7, characterised in that the band (2) is rolled with two working rollers (16) arranged on opposite sides of the band (2).
9. Process according to any one of claims 7 to 8, characterised in that the band (2) is rolled in areas that are offset to the side.
10. Process according to any one of claims 1 to 9, characterised in that a strip (24, 24') with reduced thickness is delimited on both sides by strips (25, 26) with larger thickness.
11. Process according to any one of claims 1 to 10, characterised in that a strip (24) is generated with a thickness changing in the direction of running of the band.
12. Device for manufacturing a metal band (2) with at least two strips (24, 24', 25, 26) of different thickness running in the longitudinal direction of the band (2) with rollers (10, 16), between which in operation of the band (2) they are guided through and therefore by a rolling process at least one strip (24, 24') of reduced thickness is produced, wherein working rollers (16) are supported on at least one planetary gear (9) and the planetary gear (9) embodies a direction of rotation (21) that is opposite to the conveying direction (20) of the band (2) during the rolling process, and with a drive for conveying the band (2) through the rollers (10, 16), characterised in that in conveying direction (20) of the band (2) in front of the planetary gear (9) a tool (31, 32, 33) is arranged for producing a cut-in (29, 30).
13. Device according to claim 12, characterised in that the two or more planetary gears (9) are arranged one behind the other in the conveying direction of the band (2) and/or arranged transverse to the conveying direction (20) of the band (2) on a shaft and/or are arranged mutually adjacent, transverse to the conveying direction (20) of the band (2) of several shafts one after the other in the conveying direction (20).
14. Device according to any one of claims 12 to 13, characterised in that two planetary gears (9) are arranged on opposite sides of the band (2).
15. Device according to any one of claims 12 to 14, characterised in that, in the conveying direction (20) of the band (2), in front of the first of several planetary gears (9) arranged one after the other, a tool (31, 32, 33) for producing a cut-in (29, 30) is arranged.
16. Device according to claim 15, characterised in that, before each planetary gear (9), that does not run exactly in the track of a downstream planetary gear (9), a tool (31, 32, 33) for producing a cut-in (29, 30) is arranged.
17. Device according to any one of claims 12 to 16, characterised in that the tool for producing a cut-in (29, 30) is a wheel (31) or the tool for producing a cut-in (29, 30) is a chip-removing tool, for example, a milling cutter (33) or a plane (32).
18. Device according to any one of claims 12 to 17, characterised in that the working rollers (16) support an unwinding ring (17) radially inwards.
19. Device according to claim 18, characterised in that the unwinding ring (17) is supported on a supporting ring (18) so that it can slide, said supporting ring (18) being connected to a drive shaft (14) of the planetary gear (9) so that it cannot rotate.
20. Device according to any one of claims 12 to 19, characterised in that a rolling gap is adjustable between the working rollers (16) and a counter-roller (10) or working rollers (16) situated mutually opposite during the rolling process.

Images