Method and device for manufacturing profiled metal strips

Abstract

The invention relates to a method for manufacturing profiled metal strips (1, 1), in which a metal strip (1, 1) with predefinable material thickness consisting, in particular, of stainless steel is wound up on a coil (4) and guided through a rolling stand (W1-W4) containing several rolls (2, 3, 2, 3), wherein at least the rolls (2, 3) that effectively interact with the metal strip (1, 1) are provided with a predefinable topography (8, 9), by means of which profiles with profile depths >250 m can be produced on both sides of the metal strip (1, 1) depending on the geometry of the topography (8, 9) of the rolls (2, 3), and wherein the metal strip (1, 1) is subsequent to its profiling wound up on a coil (5) and, if so required, subjected to a thermal post-treatment.

Claims

1. A method for manufacturing profiled metal strips and maximizing profile depth, characterized in that a metal strip with predefinable original material thickness consisting of stainless steel is wound up on a coil and guided through a rolling stand containing several rolls, wherein at least the rolls that effectively interact with the metal strip are provided with a predefinable positive and negative topography, which at least partly engage into one another, and by means of which profiles with profile depths >250 m for wave profiles or nub profiles can be produced on both sides of the metal strip depending on the geometry of the topography of the rolls, and the thickness of the metal strip to be rolled is adjusted with the rolling force, the profiles forming wave or nub profiles, the profiles having a wavelength and an amplitude, and having crests with radii, such that the radii is greater than 0.4 the original material thickness of the metal strip, and wherein the amplitude is equal to or less than 0.6 the wavelength.

2. The method according to claim 1, characterized in that nub structures or wave structures with profile depths >250 m are produced in the metal strip being unwound from the coil.

3. The method according to claim 1, characterized in that rolling stands with at least 4 rolls are used for profiling the metal strip.

4. The method according to claim 1, characterized in that at least one of the following marginal conditions is fulfilled in order to achieve the maximum material-dependent profile depth for wave profiles or nub profiles: 1. The wavelength of the topography profile is greater than 3 original sheet metal thickness; 2. The angle in the flank of the topography profile parallel to the rolling direction is greater than 30 ; 3.The amplitude or the thickness of the profiled sheet metal to be rolled are adjusted with the rolling force.

5. The method according to claim 1, characterized in that a material of the type 1.4301 is used in a metal strip consisting of stainless steel, wherein the maximum thickness reduction of this material during the course of the rolling operation amounts up to 45%.

6. The method according to claim 1, characterized in that positive and negative surface topographies are produced on the rolls that effectively interact with the metal strip without impairing the flow of the metal strip material, such that impression depths >1000 m can be realized at a predefinable rolling force.

Description

BRIEF DESCRPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) An exemplary embodiment of the object of the invention is illustrated in the drawings and described in greater detail below. In these drawings:

(2) FIG. 1 shows a schematic diagram of different rolling stands for profiling a metal strip,

(3) FIG. 2 shows a chart of deformation criteria,

(4) FIG. 3 shows a schematic diagram of a metal strip that is wound up on a coil with subsequent cold deformation and another coiling operation,

(5) FIG. 4 and FIG. 5 show different roll topographies for producing different profiles in the respective metal strip,

(6) FIG. 6 shows a perspective representation of a profiling process of a metal strip,

(7) FIG. 7 shows a schematic diagram of a profiled metal strip,

(8) FIG. 8 shows a schematic diagram of an alternatively profiled metal strip.

DETAILED DESCRIPTION OF THE INVENTION

(9) FIG. 1 shows a schematic diagram of several exemplary rolling stands W1 to W4, by means of which diverse profiles can be produced in a metal strip 1 consisting, for example, of stainless steel. In this context, the topography of the upper working roll 2 and the lower working roll 3 that effectively interact directly with the metal strip 1 is particularly important. The respective rolling stands W1, W2, W3, W4 are illustrated in the form of a side view. The metal strip 1 is guided through the respective rolling stands W1 to W4 in the direction of the arrow.

(10) The lower portion of FIG. 1 shows the topographies of the upper working roll 2, the lower working roll 3 and the metal strip 1 passing between these working rolls, wherein the topographies are illustrated in the form of a longitudinal view in this case. In this example, the metal strip 1 should be provided with a wave structure.

(11) FIG. 2 shows a chart of the deformation criteria of a metal strip in order to produce a wave profile or nub profile. The profile implies a 40% deformation of the metal strip. This extreme deformation can only be achieved with select steel materials. The dimensions shown (radii, angles and strip thickness) must be precisely observed because the metal strip otherwise tears or the respective rolling stand is damaged. The fitting accuracy of the upper and the lower roll is extremely important. Dimensional deviations <1% need to be observed because the rolls would otherwise shift relative to one another such that the rolling stand could be damaged or even destroyed.

(12) FIG. 3 shows a schematic diagram of a metal strip 1 that is wound up on a coil 4. The rolling direction is indicated with an arrow. With consideration of FIG. 1, this figure merely shows a so-called 4-high rolling stand W1 containing an upper roll 2 and a lower roll 3. Corresponding forces F are exerted in the direction of the metal strip 1 by means of additional rolls 2, 3 that effectively interact with the rolls 2, 3. After the metal strip 1 has passed through the rolling stand W1, the metal strip 1 is once again wound up on another coil 5.

(13) FIGS. 4 and 5 represent enhancements of FIG. 3. Only the upper roll 2 and the lower roll 3 are shown in order to provide a better overview. The surfaces 6, 7 of the rolls 2, 3 that face the metal strip 1 are provided with different topographies 8, 9 in order to produce different nub structures, wherein said topographies engage into one anotheras illustrated in FIGS. 4 and 5such that the metal strip 1 can freely flow between the upper roll 2 and the lower roll 3.

(14) For example, if a stainless steel sheet of the material type 1.4301 should be profiled, this measure allows a thickness reduction of up to 45%. The profiles 10, 11 in the metal strip 1 that can be adjusted by means of the respective topographies 8, 9 of the rolls 2, 3 are illustrated in the right portion of FIGS. 4 and 5.

(15) FIG. 6 corresponds to FIG. 5, but shows a perspective representation. This figure shows the upper roll 2, the lower roll 3 and the metal strip 1. The rolling direction is also indicated with an arrow in this case. The metal strip 1 being unwound from the not-shown coil is guided through the rolls 2, 3, wherein the profile 11 is subsequently realized. According to FIG. 3, this profiled metal strip 1 subsequently can be once again wound up on a coil. Depending on the intended use of the profiled metal strip 1, the profiled coils could be subjected to an annealing process after the rolling operation in order to restore the original deformability of the sheet metal. Such an annealed profile makes it possible to manufacture components with significantly improved rigidity and reduced sheet metal thickness by means of suitable forming measures.

(16) FIG. 7 shows a schematic diagram of a section of a profiled metal strip 1. In this case, for example, the profiles 11 according to FIG. 6 can be produced in the metal strip 1.

(17) FIG. 8 shows a schematic diagram of an embodiment of a metal strip 1, in which the profiles 12 are realized in the form of a wave structure.

SEQUENCE LISTING

(18) Not Applicable.