Manufacturing of metal belts by grinding

Abstract

The invention relates to a method for producing a metal strip (2), wherein the metal strip (2) is ground on at least one side (12, 13) essentially over the entire surface, characterized in that in a first step a transverse camber in the direction of the strip width (10) is produced on the metal strip (2) by straightening machining, wherein the first side (12) of the metal strip (2) is formed convexly and the second side (13) of the metal strip (2) opposite the first side (12) is formed at least flatly or concavely, and in a second step the distribution of the strip thickness (11) D in the direction of the strip width (10) is changed towards a uniform distribution (D(x) = constant) of the strip thickness (11) D value by grinding the second side (13) of the metal strip (2).

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a metal strip, wherein the metal strip is ground substantially over the entire surface on at least one side. Background Technology

[0002] So-called continuous strips, preferably made of steel, are a core component of various production equipment, such as those used in the furniture industry to manufacture particleboard or laminates for flooring, but also in the manufacture of photographic film or LCD displays. Metal strips used for such applications must meet high requirements in terms of surface quality. For this purpose, these metal strips are mostly ground and polished, or more precisely, highly polished. Thus, for example, in the manufacture of LCD displays, a liquid or paste-like material is applied to the moving metal strip, and then at least partially solidified material is removed from the metal strip as a thin film. The surface quality of products manufactured using such metal strips directly depends on the surface quality of the metal strip itself.

[0003] Steel strips are used as raw materials for manufacturing the metal strips according to the invention, and are supplied, for example, as semi-finished products by steel rolling mills. It is known that strips manufactured by rolling technology may exhibit thickness inhomogeneity in the strip width direction. This thickness inhomogeneity is caused by the deflection of the rolls due to the reaction forces generated during the processing of the metal strip. On the other hand, to achieve the desired high surface quality of the metal strip, further processing of the rolled walzblank metal strip is required. In addition to achieving the most uniform strip thickness, high flatness and the smallest possible surface roughness should also be achieved. Given that the corresponding metal strips sometimes have an area of ​​hundreds of square meters, their processing is an extremely demanding task. Summary of the Invention

[0004] The objective of this invention is to provide a method for manufacturing metal strips, by which metal strips with high thickness uniformity, high flatness, and high surface quality can be manufactured particularly efficiently.

[0005] The objective of this invention is achieved by a method for manufacturing a metal strip, wherein the metal strip is ground substantially across its entire surface on at least one side. Here, in a first step, a transverse arch is created on the metal strip along its width direction by a straightening process, wherein a first side of the metal strip is convexly shaped, and a second side of the metal strip opposite to the first side is at least flat or concavely shaped, and in a second step, the distribution of the strip thickness D along its width direction is changed towards a uniform distribution of the strip thickness D value (D(x) = constant) by grinding the second side of the metal strip.

[0006] According to a preferred method, in a first step, a transverse arching of the metal strip is generated when the metal strip has a concave second side.

[0007] It has proven particularly advantageous that the metal strip—especially by welding the free ends of the continuous strip or by spiral welds—is closed into a continuous strip before the second side is ground.

[0008] In a preferred extension of the invention, the continuous belt may be arranged circumferentially between two rollers prior to grinding.

[0009] In the above-described situation, it has proven particularly advantageous that the continuous belt moves relative to the belt grinding device during grinding. This variation of the invention allows for a very uniform grinding process to be achieved in a simple manner.

[0010] One implementation has proven particularly advantageous, wherein the metal strip is closed into a continuous strip after straightening.

[0011] It has proven particularly advantageous to introduce residual compressive stress into the metal strip by grinding, which corresponds to the residual compressive stress introduced into the metal strip by straightening. Attached Figure Description

[0012] To better understand the invention, it is described in more detail with the aid of the following figures.

[0013] In the separately simplified, schematic diagrams:

[0014] Figure 1 A device for straightening a metal strip is shown in a side view;

[0015] Figure 2 A side view shows the equipment used for grinding metal strips;

[0016] Figure 3 An alternative embodiment of the apparatus for grinding metal strips is shown in a side view;

[0017] Figure 4 A top-down view showing the data based on... Figure 3 Equipment used for grinding metal strips;

[0018] Figure 5 The cross-section of the metal strip along its width is shown.

[0019] Figure 6 The cross-section of the metal strip is shown to have a transverse arch along the width direction;

[0020] Figure 7 The cross-section of the metal strip is shown in its processed state.

[0021] Figure 8 Showing according to Figure 3 Detailed drawing of equipment used for grinding metal strips;

[0022] Figure 9 Showing according to Figure 2 A detailed drawing of equipment used for grinding metal strips. Detailed Implementation

[0023] Firstly, it is stipulated that identical components in different described embodiments are given the same reference numerals or the same component names, wherein the disclosure contained throughout the specification can be applied semantically to the same components having the same reference numerals or the same component names. Location descriptions selected in the specification, such as upper, lower, side, etc., relate to the directly described and illustrated figures, and these location descriptions can be applied semantically to the new location when the location changes.

[0024] The following uses Figures 1 to 4 The apparatus shown describes a method for manufacturing metal strips.

[0025] Figure 1 A side view shows an apparatus 1 for straightening a metal strip 2. The straightening apparatus 1 includes two winches 3 and 4, two drive rollers 5 and 6, and a straightening machine 7. The straightening machine 7 further includes a plurality of rollers 8 arranged sequentially and adjustable transversely to the metal strip, mounted on a frame 9. In straightening the metal strip 2, the metal strip 2 is guided in a manner known per se through a group of upper and lower rollers 8, causing the metal strip 2 to pass through a serpentine line (not shown), thereby bending the metal strip 2 in two directions. Here, the upper and lower rollers 8 are adjusted such that the straight sections of the metal strip 2 reach their yield strength in both bending directions, but do not exceed that yield strength. However, the non-straight or uneven sections of the metal strip 2 exceed the yield strength and are therefore plastically (permanently) straightened, while the straight sections retain their desired shape.

[0026] In this method, a rolled, smooth metal strip 2 is used as the raw material. This metal strip 2 can have a thickness distribution along its width 10, for example, thinning from the center to the edge of the strip. Figure 5 As shown. Figure 5 The diagram shows a cross-section of metal strip 2 along the strip width 10. The initially unprocessed metal strip 2 can have a strip thickness 11 distribution along the strip width 10, wherein the strip thickness 11 can be greater in the central region of the strip than in the edge regions. The strip thickness 11, D(x), as a function of the X-coordinate in the strip width 10 direction, can have a maximum value (d) in the central region of the metal strip 2. 2 D(x) / dx 2 < 0). However, it must be clearly emphasized here that, in Figure 5The diagram shows the non-uniformity of the thickness 11 only for better illustration and not at scale.

[0027] When in device 1 ( Figure 1 When straightening the metal strip 2, according to the present invention, in the first step of the method, the metal strip 2 is processed such that a transverse arch is produced along the direction of the strip width 10. That is, the metal strip 2 is also additionally deformed by the straightening process to obtain a substantially convex shape or convex cross-section, such as... Figure 6 As shown. That is, after straightening, the first side 12 of the metal strip 2 has a convex curved surface. Conversely, the second side opposite to the first side has a concave curved surface. This transverse arching of the metal strip 2 is achieved by adjusting the rollers 8 of the straightener 7 accordingly. The metal strip 2 is deformed in the device 1 with respect to its longitudinal extension dimension (Z direction) so that the metal strip is oriented flat or linearly, while the metal strip 2 is plastically deformed along the strip width 10 direction to obtain the described transverse arching. The shape of the cross section of the metal strip 2 along the strip width 10 direction is therefore changed from a biconvex shape ( Figure 5 Transition to a concave-convex shape ( Figure 6 Or at least transition to a plano-convex shape. Here, the curvature of the first side 12 increases, while the curvature of the second side 13 changes from a convex shape to a concave shape.

[0028] In the method for manufacturing metal strip 2 according to the present invention, in the second step, the second side surface of metal strip 2, namely the concave side surface 13, is processed by grinding.

[0029] Figure 2A side view of an apparatus 14 for grinding a metal strip 2 is shown. The metal strip 2, after being processed in a straightening device 1, is formed into a continuous strip and thus guided around two rollers 15, 16 of the apparatus 14 for grinding. The continuous strip can be achieved by joining, in particular welding, the free ends of the metal strip 2 via a transverse weld. Alternatively, the longitudinal edges of the metal strip 2 can also be welded together to form a wide continuous strip via a helical weld. The apparatus 14 for grinding the metal strip 2 also includes a belt grinding device 17 and a pressure plate 18 for supporting the metal strip 2. At least one of the two rollers 15, 16 is driven, and thus the metal strip 2 can move under the belt grinding device 17 or be pulled over the pressure plate 18. During the intermittent or continuous movement of the metal strip 2 under the belt grinding device 17, material is removed from the second side 13 by the belt grinding device. The belt grinding device 17 for this purpose includes a grinding belt 19, which is guided around three guide rollers 20, 21, and 22. According to this embodiment, the grinding belt 19 is fully abutted against the second side surface 13 of the metal belt 2 by two lower guide rollers 21, 22. By grinding the metal belt 2 with the aid of the belt grinding device 17, so much material is removed from its second side surface 13 that the belt thickness 11 eventually has a uniform distribution along the belt width 10. Figure 7 Ideally, after being ground by means of the belt grinding device 17, the metal strip 2 has a belt thickness 11 distribution over the entire belt width 10, wherein the value of the belt thickness 11 is constant (D(x) = constant). Here, according to the invention, material removal is performed only on one side of the metal strip 2, namely the second side 13, by grinding.

[0030] It has been surprisingly shown that by processing the metal strip 2—whereby first creating a transverse arch on the metal strip 2 and then grinding the second side 13 of the metal strip 2, i.e. the concave side—plastic deformation also occurs during the grinding process, so that the metal strip 2 ultimately has a flat shape. Figure 7 ).

[0031] exist Figure 7 The image shows a cross-section of the metal strip 2 in its state after being processed by the method according to the invention. In this state, the metal strip 2 has a constant strip width 11 value over its entire strip width 10. Furthermore, the shapes of the first side 12 and the second side 13 are flat, i.e., substantially planar.

[0032] With the help of Figure 3 and 4 This describes an alternative embodiment of the apparatus 14 used for grinding metal strip 2. Figure 3 Device 14 is shown here in a side view. Figure 4The device is shown in a top view. The guide rollers 20, 21, and 22 of the grinding belt 19 of the grinding device 17 are arranged such that the surface of the grinding belt 19 and the metal strip 2 contact along a line. This line contact allows for particularly targeted removal of the metal strip 2 under relatively low grinding pressure. For example, by means of… Figure 4 As can be better seen, the belt grinding device 17 can be adjusted in the lateral direction of the metal belt 2, i.e., in the direction of the belt width 10, or it can oscillate on the side surface 13 of the metal belt 2 in the direction of the belt width 10 (arrow 23). Additionally, the belt grinding device 17 can also rotate relative to the vertical axis (Y direction), thereby changing the direction of the grinding motion of the grinding belt 19 on the side surface 13 of the metal belt 2.

[0033] Figure 8 Showing according to Figure 3 Details of the apparatus 14 for grinding the metal strip 2 are shown, wherein only the metal strip 2 and the belt grinding device 17 are shown. According to this embodiment of the apparatus 14 for grinding the metal strip 2, the belt grinding device 17 is constructed such that the grinding belt 19 rests against the metal strip 2 along a line and is ground in this manner. During the processing of the second side surface 13 of the metal strip 2, the belt grinding device 17 reciprocates along the side surface 13 as needed (arrow 23). Thus, material is removed from the metal strip 2 until a uniform distribution of the strip thickness 11 along the strip width 10 is finally achieved corresponding to the side surface 13' indicated by the dashed line.

[0034] Figure 9 Showing according to Figure 2 Details of the apparatus 14 for grinding the metal strip 2 are provided. According to this embodiment, the belt grinding device 17 is constructed such that the guide rollers 20, 21, and 22 are arranged such that the grinding belt 19 is planarly attached to the side surface 13 of the metal strip 2. The belt grinding device 17 can reciprocate along the belt width 10 direction on the side surface 13 during the processing of the metal strip 2. Additionally, it is also possible that the belt grinding device 17 rotates or pivots relative to the vertical axis (Y direction). Thus, the direction of movement of the grinding belt 19 relative to the side surface 13 of the metal strip 2 can be changed as needed. Two aspects are ultimately achieved by grinding the second (concave) side surface 13 of the metal strip 2. The distribution of the belt thickness 11 along the belt width 10 direction is changed towards a uniform distribution of the belt thickness 11 value. Furthermore, by grinding the second side surface 13 of the metal strip 2, the cross-section of the metal strip 2 is also deformed towards a planar shape direction, such as… Figure 7 As shown. Residual compressive stress can be introduced into the metal strip through grinding, and this residual compressive stress corresponds to the residual compressive stress introduced into the metal strip through straightening.

[0035] The various embodiments illustrate possible implementation variations, wherein it should be noted that the invention is not limited to the particularly illustrated implementation variations, but may also include different combinations of various implementation variations, and these variations are within the capabilities of those skilled in the art based on the teachings of the specific invention on the technical process.

[0036] Individual features or combinations of features from the different embodiments shown and described can on their own constitute independent, inventive solutions. The task on which these independent, inventive solutions are based can be derived from the specification.

[0037] All descriptions of value ranges in this specification should be understood as including both any and all of the partial ranges therein. For example, the description of 1 to 10 should be understood as including all partial ranges from the lower limit of 1 to the upper limit of 10, that is, all partial ranges that begin with a lower limit of 1 or greater and end with an upper limit of 10 or less, such as 1 to 1.7 or 3.2 to 8.1 or 5.5 to 10.

[0038] As per the regulations, it should be noted that, for better understanding of the structure, some elements are shown partially out of scale and / or enlarged and / or reduced.

[0039] List of reference numerals

[0040] 1 Straightening device

[0041] 2 metal strips

[0042] 3 winches

[0043] 4 winches

[0044] 5 drive rollers

[0045] 6 drive rollers

[0046] 7 Straightening Machine

[0047] 8 rollers

[0048] 9 racks

[0049] 10-band width

[0050] 11-band thickness

[0051] 12 sides

[0052] 13 side views

[0053] 14 devices

[0054] 15 rolls

[0055] 16 rolls

[0056] 17 with grinding device

[0057] 18 pressure plates

[0058] 19 Grinding Belt

[0059] 20 steering rollers

[0060] 21 steering rollers

[0061] 22 steering rollers

[0062] 23 arrows

Claims

1. A method for manufacturing a metal strip (2), wherein, The metal strip (2) is ground substantially over the entire surface on at least one side (12, 13), characterized in that, in a first step, a transverse arch is created on the metal strip (2) in the direction of the strip width (10) by a straightening process, wherein the first side (12) of the metal strip (2) is convexly shaped, and the second side (13) of the metal strip (2) opposite to the first side (12) is at least flat or concavely shaped, and in a second step, the distribution of the strip thickness (11) in the direction of the strip width (10) is changed to a uniform distribution of the value of the strip thickness (11) by grinding the second side (13) of the metal strip (2).

2. The method according to claim 1, characterized in that, In the first step, the transverse arching of the metal strip (2) is generated when the metal strip (2) has a concave second side (13).

3. The method according to claim 1 or 2, characterized in that, Before grinding the second side, the metal strip (2) is closed into a continuous strip.

4. The method according to claim 3, characterized in that, Before grinding the second side, the metal strip (2) is closed into a continuous strip by welding the free end of the continuous strip or by a spiral weld.

5. The method according to claim 3, characterized in that, The continuous belt is arranged in a circular pattern between two rollers (15, 16) prior to grinding.

6. The method according to claim 5, characterized in that, The continuous belt moves relative to the belt grinding device (17) during grinding.

7. The method according to claim 3, characterized in that, The metal strip (2) is closed into a continuous strip after straightening.

8. The method according to claim 1 or 2, characterized in that, The residual compressive stress is introduced into the metal strip (2) by grinding, which corresponds to the residual compressive stress introduced into the metal strip (2) by straightening.

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