DE10156087A1 - For the production of metal strip with different thicknesses, the rollers and/or roller stand impose a different thickness across the direction of strip travel in an assembly which can be integrated into the sheet bar production stage - Google Patents

Abstract

To produce metal strips with different thicknesses, to be used for sheet bars, the sections with a different thickness are rolled and/or aligned across the line of strip travel. At least one pair of rollers (5,6) or roller stand (1) and/or an alignment roller block/machine gives a partial lateral working to the metal strip (8). The rollers can be given a lateral movement. The roller (6) which shapes a transit zone (B3) has a variable width and shaping.

Description

The invention relates to the manufacture and / or Straightening metal strips across their cross sections have different thicknesses. From these metal strips Boards cut as the starting product for in Forming parts manufactured are used. The different strip thicknesses allow one Cross-section distribution in the molded part that meets the demands while reducing the use of materials.

State of the art

For the production of molded parts, the forming presses are blanks fed. In particular in the automotive industry there are efforts to Weight reduction is a hot topic. Here serve the Moldings z. B. for the production of the body shell. For the Realization of a lightweight construction are the boards, under Consideration of the occurring load, in its weight minimized.

A known way is to weld blanks of different thicknesses to form a blank. Problems with this process can arise from the weldability of the steel sheets and from the edges to be welded together. These edges are never absolutely straight, which results in edge contact or gaps that are too large or ripples along the course of the seam. The development of alternative processes led to the creation of a longitudinal profile while the metal strips were being rolled. This process is known from the production of heavy plates as so-called longitudinal profile plates. These longitudinal profile sheets have different thicknesses over their length. Such hot-rolled profile sheets are, for. B. used in steel bridge construction. The local values of the thickness are adapted to the load profile of the bridge. (See Steel Information Center Documentation 570 "Heavy plate production and application" page 5, 23 and 24)

The idea was recorded in DE 198 46 900, in the also by hot rolling longitudinal profile sheets, d. H. sheets different thickness in the longitudinal direction. The band of a targeted tempering becomes like this subjected that the volume in sections a different Flow behavior is impressed. Desired belt sections small thickness are heated by means of a heater other belt sections are cooled by cooling devices. A constant rolling force over a Feather group applied, making thinner and thicker Band sections can be achieved.

The disadvantage of this method is the high expenditure on equipment and that to achieve defined strip thicknesses in very narrow Manufacturing process. Exact strip thicknesses are especially to achieve good parts in the following Forming process absolutely necessary. Because of the rough Rolling mill operation and the associated risk that a or several parameters are subject to greater fluctuations the process security is endangered and the risk of being inadmissible given large thickness tolerance.

In another known method, the tape is in Longitudinal direction by cold rolling to different thicknesses reshaped. This process, called flexible rolling, works with a variable roll gap. While rolling is by means of a computer by a control device desired roll gap adjusted. This will continuous sheet thickness profiles achieved in the longitudinal direction.

Details of the process can be found in an essay in "Werkstatt und Betrieb" 131 ( 1998 ) 5, pages 424 to 427. By changing the roll gap, very low-strength designs can be achieved in the transition zones of the thickness ranges. However, short thickness transitions are only possible at low rolling speeds, to the disadvantage of good economy.

Special straightening process for straightening sheet metal with variable Thicknesses are not known.

Object and advantage of the invention

The invention has set itself the task of metal strips different thickness with high process reliability and To produce economy and / or to straighten. A Another object of the invention is that the proposed Process and device also in blank cutting systems can be integrated.

This object is achieved with a method and a device solved by the characterizing part of the claims. In the subclaims become advantageous and expedient Further training proposed.

The invention leaves the known approach of the prior art Technique and suggests a change in the thickness of the metal band transverse to the rolling direction. The solution is the metal band by independently acting roller units on the to roll and straighten the desired different thicknesses. These roller units are one behind the other and to each other staggered. By moving the Roll units transverse to the direction of belt travel is Making different thicknesses to different Bandwidths adjustable and straightening is also possible. Thus, a variety of sheet metal strips with different Variants in the thickness and the required width manufactured and directed.

The execution of the inventive idea is in possible in various ways. The simplest variant is the tape as a coil with the first required thickness delivered and by an additional pair of rollers on a second small thickness rolled with a given width section. If several thicknesses are to be rolled, z. Legs Roller unit stationary and the subsequent one can be moved to be ordered.

The rolling process can be carried out on a hot strip as well as especially with a low degree of forming, on the cold strip respectively.

A straightening process can also be carried out subsequently. It then two straightening roller blocks are provided, one of which is transverse is displaceable to the direction of belt travel. Thus, the in the strip pass direction of the first straightening machine the strip area straighten with the greatest thickness and into the following Straightener the part with the smaller thickness.

The rolling mill and the straightening machines can also be directly in a conveyor system can be integrated. This belt system can with a swivel scissors, for cutting trapezoidal or Rectangular boards, or with one equipped with cutting tools Cutting press, for cutting shaped blanks, be equipped.

Further details and advantages of the invention result from the following exemplary embodiments of a rolling mill, illustrated with reference to FIGS. 1 to 5.

Description of the invention

Show it:

Fig. 1 roll stand transverse to the direction of strip travel

Fig. 2 2 roll stands in the direction of strip travel

Fig. 3 top view of 2 roll stands

Fig. 4 roll stand transverse to the direction of strip travel in an alternative embodiment

Fig. 5 top view of Fig. 4

In the basic illustration, according to FIG. 1, a roll stand 1 is shown. The roll stand 1 consists of a frame 2 , support rolls 3 and 4 , work rolls 5 and 6 . The roll gap can be adjusted via the feed device 7 for the support roll 4 and the work roll 6 .

The different thicknesses D1 and D2 can be seen in cross section on the formed metal strip 8 . So that only a certain width B2 of metal strip 8 is rolled to the thickness D2, the work roll 6 is designed with different diameters. The smaller diameter of the work roll 6 is dimensioned such that no forming force acts on the larger thickness D1 of the metal strip 8 . In the width B1, the thickness D1 is not formed by the metal strip 8 .

In the illustration according to FIG. 1, only the thickness D2 of metal strip 8 is thus rolled onto the width B2. Depending on the load, a transition zone B3 is designed to be stress-optimized. The transition area B3 can be designed to be variable in width and shape in accordance with the loads that occur during operation on the formed component. If a sharp transition from width B1 to width B2 is required, transition zone B3 can be omitted. The roll stand 1 is provided with wheels 11 and can be moved on rail 12 , according to arrow 13 . The travel drive, not shown, can, for. B. via gear motor by means of nut and spindle. The movability is used to adjust to the desired width distribution during the rolling process of the strip. After reaching the forming position, the wheels can be raised and the roll stand lowers to the foundation level. An additional position positioning and also locking on the foundation can be provided.

The arrangement of 2 roll stands 1 , 9 can be seen from FIG . These roll stands 1 , 9 are parallel to one another and transverse to the strip travel direction 10 . If the metal strip 8 has the initial thickness D, it is rolled in the roll stand 9 to the required thickness D1. However, if the metal strip 8 is already delivered in the desired thickness D1, the roll stand 9 can be omitted. As shown in FIG. 1, the metal strip 8 is rolled to the thickness D2 in the roll stand 1 . In the version for straightening the metal strip 8 , however, at least 2 straightening machines are always required. One straightener straightens the strip area with the thickness D1 and the second the strip area with the thickness D2.

Fig. 3 shows the position of the rolling stands transverse to the direction of strip travel in a plan view. While the roll stand 9 is arranged in a stationary manner, the roll stand 1 can be moved transversely to the strip travel direction 10 , on rails 12 . This movability enables the variable adaptation to the width B2 to be rolled.

An alternative embodiment is shown in Fig. 4 and Fig. 5. According to this proposal, more than two thicknesses can also be generated across the cross section. So z. B. D the initial thickness of metal strip 8 , D1 would be rolled in the roll stand 9 and D2 in the roll stand 1 . Roll stand 1 , like roll stand 9, is also stationary, but is designed with two work rolls 13 , 14 . The width B4 required for the thickness D2 can be produced by shifting the work rolls 13 , 14 transversely to the strip transport direction in the roll stand 1 . The shift is indicated by arrows 15 , 16 . The width B4 can thus be variably adjusted over a wide range.

The illustrated and described embodiment using the example of a Rolling mill is also available at any time without restriction Straightening the metal strip required straightening machines transferable. If 2 straightening roller blocks were used, the first straightening roll block straightening thickness D1 while the second Straightening roller block straightens the thickness D2. The second Straightening roller block, or a second straightening machine, could can be executed transversely. The straightening rollers of the second Straightening machine or the second straightening roller block are then in Range of thickness D1 also reduced in diameter and do not generate a directivity.

The invention also encompasses all professional configurations in the Within the scope of the applicable claims. So the number of roller or straightening roll blocks not limited to 2, but dependent on the number of different thicknesses to be produced in the Cross-section. Also on a displaceability of the roller or Straightening roller blocks can be omitted if these are used as Interchangeable cassettes can be designed interchangeably. At a Using removable cassettes, the rollers are according to the Adjust the thickness profile of the metal strip in diameter.

Claims (7)

1. A method for producing a metal strip with different thicknesses for the production of blanks, characterized in that the different thickness sections can be rolled and / or straightened transversely to the direction of strip travel. 2. Device for performing the method according to claim 1, characterized in that at least one pair of rollers ( 5 , 6 , 13 , 14 ) or roll stand ( 1 ) and / or a straightening roll block or straightening machine is provided which the continuous metal strip ( 8 ) in Partially machined transverse direction. 3. Device according to claim 2, characterized in that at least two roll stands ( 1 , 9 ) and / or two straightening machines are arranged one behind the other in the direction of strip travel and the respective second ( 1 ) is transversely displaceable. 4. The device according to claim 2, characterized in that two upper work rolls ( 13 , 14 ) with a displaceability in the transverse direction ( 15 , 16 ) are arranged in a roll stand ( 1 ). 5. Device according to one of the preceding claims 2 to 4, characterized in that at least one roll stand ( 1 ) and / or at least two straightening machines are in a blank cutting system. 6. The device according to claim 2, characterized in that the roller ( 6 ) of the roll stand ( 1 ) in the width range of the metal strip ( 8 ) has at least two different diameters. 7. The device according to claim 2, characterized in that the roller ( 6 ) for rolling a transition region (B3) is variable in its width and shape.