DE10156087B4 - Device for processing a metal strip with different thicknesses - Google Patents

Abstract

contraption for processing a metal strip with different thicknesses in particular for the production of boards, with, at least one Roller pair (5, 6, 13, 14) in at least one as a roll stand (1, 9), Straightening block or straightening machine trained forming machine, the pair of rollers being in the longitudinal direction (10) continuous metal strip (8) in the transverse direction at least partially machined, characterized in that the roller pair (5, 6; 14) on the metal strip (8) have different thickness sections (D1, D2) transversely to the tape passage direction (10), wherein the rolling stand (1) transversely is displaceable.

Description

The The invention relates to a device for processing a Metal strip with different thicknesses according to the preamble of Claim 1.

Out these metal bands Cut blanks are the starting material for in forming presses used moldings serve. The different tape thicknesses enable doing a stress-appropriate cross-sectional distribution in the Molded part while reducing the use of materials.

to Production of molded parts are fed to the forming presses blanks. Especially In the automotive industry, efforts to reduce weight are a topical one Theme. Here are the moldings z. B. for the production of the body shell. For the realization a lightweight construction, the boards, taking into account the occurring load, minimized in their weight.

One well-known way is boards of different thicknesses to a To weld the molding board. Problems with this procedure can be caused by the weldability the steel sheets and by the edges to be welded together. These edges are never absolutely straight, which causes along the seam Edge contact or too big Column or ripples arise. The development, alternative Procedure led to already during rolling metal bands a longitudinal profile to create. This process is from the production of heavy plates as so-called longitudinal profile sheets known. These longitudinal profile sheets show over her length different thicknesses. Such hot rolled profile sheets are z. B. in steel bridge construction used. The local Thickness values are adjusted to the loading profile of the bridge. (Please refer Steel Information Center Documentation 570 "Heavy plate production and application "page 5, 23 and 24).

The idea was taken up in the DE 198 46 900 A1 , in which also by hot rolling longitudinal profile sheets, ie sheets of different thickness in the longitudinal direction, are disclosed. In this case, the band is subjected to a targeted temperature control in such a way that the band is impressed in sections with a different flow behavior. Desired band sections of small thickness are heated by means of heating, while other band sections are cooled by cooling means. For forming a constant rolling force is applied via a spring group, whereby thinner and thicker band sections can be achieved.

adversely in this method, the high expenditure on equipment and the Achieving defined strip thicknesses in very tight production limits expiring process. Exact strip thicknesses are in particular to achieve good parts at mandatory for the subsequent forming process required. Due to the rough rolling mill operation and the so associated risk that one or more parameters greater fluctuations process safety is endangered and the danger of being inadmissible great thickness tolerance given.

at In another known method, the tape is longitudinally transformed by cold rolling to different thicknesses. This, as a flexible rolling process, works with a variable Nip. While the rolling is by means of a computer by a control device the respectively desired Rolling gap regulated. This results in continuous sheet thickness profiles in the longitudinal direction achieved.

details of the method are from an article in "Workshop and Operation" 131 (1998) 5, page 424 to see 427. By change of the nip are in the transition zones the thicknesses very strength-favorable designs achievable. Short thickness transitions are However, only at low rolling speed possible, to the detriment of a good Economics.

Specific Straightening method for straightening sheets with variable thicknesses are not known.

From the document US-4,735,074 A a device for processing a metal strip according to the preamble of claim 1 has become known. However, this device is complicated in structure and does not allow flexibility in terms of variable execution of different thickness portions of the metal strip.

The Invention has set itself the task of developing a device different with the metal bands Thickness with high process reliability and Economy and / or to judge.

These Task is in a device according to the preamble of the claim 1 solved by the characterizing part of patent claim 1. In the dependent claims become advantageous and expedient developments proposed.

The invention leaves the known approach of the prior art and proposes a change in the thickness of the metal strip transverse to the rolling direction. The solution provides, the metal To roll and judge by independently acting roller units to the desired different thicknesses. These roller units are arranged one behind the other and offset from each other. By a displaceability of the roller units transversely to the tape passage direction, the production of the various thicknesses on different bandwidths is adjustable and a straightening process is possible. Thus, a variety of metal strips with different variants in thickness and the required width can be produced and directed.

The execution of the inventive concept is possible in different ways. In the simplest version, the band is already used as a coil with the first required thickness and by an additional Roller pair on one. second small thickness rolled with predetermined width section. If several thicknesses are rolled, z. B. a roller unit stationary and the subsequent be arranged transversely.

The Walzverfahren can both on a hot strip and, in particular at a lower degree of deformation, done on the cold strip.

Also Subsequently, a straightening process can be carried out. There are two Indicative billets provided by one of them displaceable transversely to the tape passage direction is. Thus, the in the tape passage direction first leveler the band area with the largest thickness judge and in the subsequent straightening machine the part with the lower Thickness.

The Rolling mill and straightening machines can also be used directly in one Belt system to be integrated. This conveyor system can be equipped with a pivoting shear, for cutting trapezoidal or rectangular boards, or with a equipped with cutting tools Cutting press, for cutting shaped blanks, be equipped.

Further details of the invention will become apparent from the following embodiments of a rolling mill, illustrated by the 1 to 5 ,

Description of the invention

It demonstrate:

1 Roll stand transversely to the tape passage direction

2 2 rolling mills in the tape passage direction

3 Top view on 2 rolling stands

4 Roll stand transversely to the tape passage direction in an alternative embodiment

5 Top view 4

In the basic representation, according to 1 , is a rolling stand 1 shown. The rolling stand 1 consists of a frame 2 , Back-up rolls 3 and 4 , Stripper 5 and 6 , About delivery device 7 for back-up roll 4 and stripper 6 the roll gap is adjustable.

Recognizable by the formed metal band 8th are the different thicknesses D1 and D2 in cross-section. Thus only a certain width B2 of metal strip 8th rolled to the thickness D2 is the work roll 6 executed with different diameters. Here is the smaller diameter of the work roll 6 so dimensioned that to the greater thickness D1 of the metal strip 8th no forming force acts. In the width B1, the thickness D1 of metal strip 8th not reshaped.

In the presentation according to 1 Thus, only the thickness D2 of metal strip 8th rolled to width B2. Depending on the load case, a transition zone B3 is designed optimized for stress. The transition region B3 can be made variable according to the loads occurring in the operational use of the formed component, in the width and in the form. If a sharp transition from width B1 to width B2 is required, transition zone B3 can be omitted. The rolling stand 1 is with wheels 11 provided and on track 12 movable, according to arrow 13 arranged. The drive not shown, z. B. via geared motor by means of nut and spindle. The mobility is used to adjust to the particular desired width distribution during the rolling process of the strip. After reaching the forming position, the wheels can be raised and the rolling mill lowers to the foundation level. Additional positional positioning and also locking on the foundation can be provided.

Out 2 is the arrangement of 2 rolling stands 1 . 9 to see. These rolling stands 1 . 9 are parallel and transverse to the tape passage direction 10 side by side. Has the metal band 8th the initial thickness D, so this is in the rolling mill 9 rolled to the required thickness D1. If the metal band 8th However, already delivered in the desired thickness D1, the rolling stand 9 omitted. As in 1 is shown in the rolling stand 1 the metal band 8th rolled to the thickness D2. In the embodiment for straightening the metal strip 8th however, at least 2 straightening machines are always required. A straightener straightens the band area with the thickness D1 and the second is the band area of thickness D2.

3 shows the position of the rolling stands transversely to the tape passage direction in a plan view. While the rolling mill 9 is stationary, is the rolling stand 1 transverse to the tape passage direction 10 , on tracks 12 , movable. This mobility allows the variable adaptation to the width to be rolled B2.

An alternative embodiment is in 4 and 5 shown. According to this proposal, more than two thicknesses can be generated over the cross section. For example, D is the initial thickness of metal strip 8th D1 would be in the rolling stand 9 and D2 in the rolling stand 1 rolled. rolling mill 1 is like rolling mill 9 also stationary, but with 2 strippers 13 . 14 executed. The required for the thickness D2 width B4 is by a shift of the work rolls 13 . 14 transverse to the strip transport direction in the rolling stand 1 produced. The shift is through the arrows 15 . 16 characterized. The width B4 is thus variably adjustable over a wide range.

The illustrated and described embodiment using the example of a rolling mill is also at any time without restriction to the straightening machines required for straightening the metal strip transferable. at Use of 2 straightening roller blocks would the first straightening roller block the thickness D1, while the second straightening roller block the thickness D2 is directed. The second straightening block, or a second straightening machine, could be made transversely displaceable. The straightening rollers of the second straightening machine or the second straightening roller block are then also deposited in the region of the thickness D1 in diameter and generate no straightening force.

The Invention also all expert Embodiments within the scope of the valid claims. So is the number of Roller or straightening roller blocks not limited to 2, but dependent from the number of different thicknesses to be produced in cross section. Also on a displacement of the roll or straightening roller blocks can be waived if these are exchangeable as exchangeable cassettes be designed. When using removable cassettes are the rollers according to the thickness profile of the metal strip in diameter adapt.

Claims (7)

Device for processing a metal strip with different thicknesses, in particular for producing blanks, with, at least one pair of rollers ( 5 . 6 ; 13 . 14 ) in at least one as rolling stand ( 1 . 9 ), Straightening block or straightening machine trained forming machine, wherein the pair of rollers in the longitudinal direction ( 10 ) continuous metal strip ( 8th ) in the transverse direction at least partially, characterized in that the pair of rollers ( 5 . 6 ; 13 . 14 ) on the metal strip ( 8th ) Different thickness sections (D1, D2) transversely to the tape passage direction ( 10 ), wherein the rolling stand ( 1 ) is transversely displaceable. Apparatus according to claim 1, characterized in that at least two rolling stands ( 1 . 9 ) in the tape passage direction ( 10 ) are arranged one behind the other, wherein at least one of the rolling stands ( 1 . 9 ) is transversely displaceable. Apparatus according to claim 1 or 2, characterized in that as a forming machine, a roll stand ( 1 . 9 ) and / or a straightening block and / or a straightening machine are provided for metal strip processing. Apparatus according to claim 1 or 2, characterized in that in a roll stand ( 1 ) two upper work rolls ( 13 . 14 ) with a displaceability in the transverse direction ( 15 . 16 ) are arranged. Device according to one of the preceding claims 1 to 3, characterized in that at least one roll stand ( 1 ) and / or at least two straightening machines in a blanking machine. Device according to claim 1, characterized in that a roller ( 6 ) in a rolling stand ( 1 ) in the width range of the metal strip ( 8th ) has at least two different diameters. Device according to claim 1 or 6, characterized in that a roller ( 6 ) is variable shaped for rolling a transition region (B3) in its width and shape.