Bending device and method for producing a wire mesh

Abstract

A bending device for producing a wire netting, in particular a safety net, includes a plurality of helices, which are braided with one another, and of which at least one helix is made from at least one single wire, a wire bundle, a wire strand, a wire rope, and/or another longitudinal element having at least one wire that comprises high-tensile steel, having at least one bending unit which, for producing a helix blank having at least two curved legs and having at least one bend point that connects the curved legs by a bending of the longitudinal element, has at least one guide worm and at least one braiding knife that is rotatable relative to the guide worm about a rotation axis, and having a braiding unit which is configured for braiding the helix blank into a pre-netting of the wire netting, and the bending device has a straightening unit which is configured for an at least partial straightening of the curved legs.

Claims

1. A bending device for producing a wire netting, the wire netting comprising a plurality of helices which are braided with one another and of which at least one helix is made from at least one longitudinal element having at least one wire that comprises high-tensile spring steel with a tensile strength of at least 800 N mm.sup.2, the bending device comprising: at least one bending unit which is configured for processing the wire with the tensile strength of at least 800 N mm.sup.2, wherein the bending unit is configured to produce a helix blank having at least two curved legs and having at least one bend point that connects the curved legs by a bending of the longitudinal element, and has at least one guide worm and at least one braiding knife that is rotatable relative to the guide worm about a rotation axis, and a straightening unit which is configured for straightening of the curved legs, wherein the straightening unit has at least one pressing element which is movable perpendicularly to a longitudinal direction of the helix blank, wherein the straightening unit is configured for compressing the helix blank with the pressing element by an over-pressing of the curved legs in a pressing direction that is perpendicular to the rotation axis, and wherein the straightening unit is supported so as to be rotatable around the rotation axis.

2. The bending device as claimed in claim 1, wherein a rotation of the braiding knife and a rotation of the straightening unit are synchronized.

3. The bending device as claimed in claim 1, wherein the pressing element is disposed in an outlet region of the bending unit.

4. The bending device as claimed in claim 1, wherein the pressing element is configured for over-pressing and/or over-bending the curved legs to a different degree at different points of the legs.

5. The bending device as claimed in claim 4, wherein the pressing element is configured for over-pressing and/or over-bending the curved legs to a higher degree in a central region of the legs.

6. A method for producing a wire netting, the wire netting comprising a plurality of helices which are braided with one another and of which at least one helix is made from at least one longitudinal element having at least one wire that comprises high-tensile spring steel with a tensile strength of at least 800 N mm.sup.2, the method comprising: making a helix blank having at least two curved legs and having at least one bend point that connects the legs by bending the at least one longitudinal element having the at least one high-tensile spring steel wire, straightening the curved legs of the helix blank using the bending device of claim 1 by an over-pressing in a pressing direction that is perpendicular to the rotation axis, wherein the legs that are to be straightened are over-pressed so far that upon completed bending and upon a subsequent partial spring-back the legs have a straight profile, providing a pre-netting, braiding the helix blank having the straight legs into the pre-netting, and after the braiding step, cutting off the helix blank having the straight legs so as to correspond to a width of the wire netting, wherein the helix blank having the straight legs, after being braided and after being cut forms the at least one helix of the plurality of helices that together form the wire netting.

7. A bending device for producing a wire netting, the wire netting comprising a plurality of helices which are braided with one another and of which at least one helix is made from at least one longitudinal element, having at least one wire that comprises high-tensile spring steel with a tensile strength of at least 800 N mm.sup.2, the bending device comprising: at least one bending unit which is configured for processing the wire with the tensile strength of at least 800 N mm.sup.2, wherein the bending device is configured to produce a helix blank having at least two curved legs and having at least one bend point that connects the curved legs by a bending of the longitudinal element, and has at least one guide worm and at least one braiding knife that is rotatable relative to the guide worm about a rotation axis, and a straightening unit which is configured for a straightening of the curved legs, wherein the straightening unit has at least one pressing element, which is movable perpendicularly to a longitudinal direction of the helix blank, wherein the straightening unit is configured for compressing the helix blank with the pressing element by an over-pressing of the curved legs in a pressing direction that is perpendicular to the rotation axis, wherein a pressing surface of the pressing element is curved, and wherein the curved pressing surface is bulged in such a manner that different regions of a curved leg are bent and/or pressed, or are over-bent and/or over-pressed to a different extent.

8. The bending device as claimed in claim 7, wherein the curved pressing surface is bulged multiple times in a convex manner.

9. A method for producing a wire netting, the wire netting comprising a plurality of helices which are braided with one another and of which at least one helix is made from at least one longitudinal element having at least one wire that comprises high-tensile spring steel with a tensile strength of at least 800 N mm.sup.2, the method comprising: making a helix blank having at least two curved legs and having at least one bend point that connects the legs by bending the at least one longitudinal element having the at least one high-tensile spring steel wire, straightening the curved legs of the helix blank using the bending device of claim 7 by an over-pressing in a pressing direction that is perpendicular to the rotation axis, wherein the legs that are to be straightened are over-pressed so far that upon completed bending and upon a subsequent partial spring-back the legs have a straight profile, providing a pre-netting, braiding the helix blank having the straight legs into the pre-netting, and after the braiding step, cutting off the helix blank having the straight legs so as to correspond to a width of the wire netting, wherein the helix blank having the straight legs, after being braided and after being cut off forms the at least one helix of the plurality of helices that together form the wire netting.

Description

DRAWINGS

(1) Further advantages can be gathered from the following description of the drawings. Two exemplary embodiments of the invention are illustrated in the drawings. The drawings, the description and the claims contain numerous features in combination. A person skilled in the art will expediently also consider the features individually and combine them to form appropriate further combinations.

(2) In the drawings:

(3) FIG. 1 shows a part of a wire netting in a schematic front view;

(4) FIG. 2 shows a part of a helix of the wire netting in a perspective illustration;

(5) FIG. 3 shows a further part of the wire netting in a schematic front view;

(6) FIG. 4 shows two legs and a bend point of the helix in different views;

(7) FIG. 5 shows two interconnected bend points of two helices in different views;

(8) FIG. 6 shows a bending device in a schematic illustration;

(9) FIG. 7 shows a part of the bending device in a schematic lateral view;

(10) FIG. 8 shows the part of the bending device in a schematic plan view;

(11) FIG. 9 shows a schematic flow diagram of a method for producing the wire netting;

(12) FIG. 10 shows a part of a further bending device in a schematic illustration;

(13) FIG. 11 shows a schematic flow diagram of a further method for producing a further wire netting;

(14) FIG. 12 shows a first alternative pressing element in a schematic illustration;

(15) FIG. 13 shows a second alternative pressing element in a schematic illustration;

(16) FIG. 14 shows a third alternative pressing element in a schematic sectional illustration;

(17) FIG. 15 shows a fourth alternative pressing element in a schematic illustration; and

(18) FIG. 16 shows a fifth alternative pressing element in a schematic illustration.

DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

(19) FIG. 1 shows a part of a wire netting 10a in a schematic front view. The wire netting 10a is embodied as a safety net. The wire netting 10a that is shown may for example be used as an embankment safeguard, avalanche safeguard net, catchment fence or the like. The wire netting 10a has a plurality of helices 12a, 14a which are braided with one another, in particular a helix 12a and a further helix 14a. In the present case, the wire netting 10a has a plurality of identically implemented helices 12a, 14a which are twisted into one another and realize the wire netting 10a.

(20) FIG. 2 shows a portion of the helix 12a of the wire netting 10a in a perspective illustration. FIG. 3 shows a further part of the wire netting 10a in a schematic front view. The helix 12a is manufactured from a longitudinal element 16a having a wire 18a. In the present case, the longitudinal element is embodied as a single wire. In the present case, the longitudinal element 16a is the wire 18a. The wire 18a has a corrosive-resistant coating. However, it is also conceivable for a longitudinal element to comprise a plurality of wires and/or other elements. For example, a longitudinal element may be realized as a wire rope, a wire bundle, a wire strand, or the like. The properties of the wire 18a will be described hereunder. However, said properties can be applied in a corresponding manner to other longitudinal elements. For example, a strand or a wire bundle or another longitudinal element can be bent so as to form a helix in an analogous manner to the shown wire 18a, and helices from longitudinal elements of this type can be connected in a corresponding manner so as to form a wire netting.

(21) The wire 18a is bent to form the helix 12a. The helix 12a is embodied in a one-part implementation. The helix 12a is manufactured from a single wire piece. In the present case, the wire 18a has a diameter of 3 mm. The wire 18a is at least partially manufactured from high-tensile steel. The wire 18a is embodied as a high-tensile steel wire. The wire 18a has a tensile strength of at least 800 N mm.sup.2. In the present case, the wire 18a has a tensile strength of approximately 1770 N mm.sup.2. As mentioned above, other tensile strengths are however self-evidently also conceivable, in particular also tensile strengths of greater than 2200 N mm.sup.2. In particular, it is conceivable for a wire to be manufactured from ultra-high-tensile steel. It is furthermore conceivable for a wire to have some other diameter, such as for example less than 1 mm, or approximately 1 mm, or approximately 2 mm, or approximately 4 mm, or approximately 5 mm, or approximately 6 mm, or an even greater diameter. As mentioned above, it is conceivable that a wire comprises different materials and is in particular realized as a composite wire.

(22) The helix 12a and the further helix 14a are embodied identically. The helix 12a is therefore described in more detail in an exemplary manner hereunder. However, it is also conceivable that a wire netting comprises at least one first helix and at least one second helix which is implemented differently than the first helix.

(23) The helix 12a has a first leg 20a, a second leg 22a and a bend point 24a that connects the first leg 20a and the second leg 22a. In the present case, the helix 12a has a plurality of first legs 20a, a plurality of second legs 22a and a plurality of bend points 24a, which, for the sake of clarity, are not all denoted by reference signs. Furthermore, in the present case, the first legs 20a are of at least substantially identical design with respect to one another. Furthermore, in the present case, the second legs 22a are of at least substantially identical design with respect to one another. Furthermore, in the present case, the bend points 24a are of at least substantially identical design with respect to one another. Therefore, by way of example, the first leg 20a, the second leg 22a and the bend point 24a will be described in more detail below. It is self-evidently conceivable for a wire netting to have different first legs and/or different second legs and/or different bend points.

(24) The helix 12a has a longitudinal direction 28a. The helix 12a has a longitudinal axis 109a which runs parallel to the longitudinal direction 28a. The longitudinal direction 28a corresponds to a direction of main extent of the helix 12a. In a frontal view 54a perpendicular to a plane of main extent of the helix 12a, the first leg 20a runs with a first inclination angle 26a with respect to the longitudinal direction 28a of the helix 12a. In particular, the frontal view is a view in frontal direction 54a. The first leg 20a has a longitudinal axis 110a. The longitudinal axis 110a of the first leg 20a runs parallel to a direction of main extent 112a of the first leg 20a. FIG. 3 illustrates the helix 12a in the frontal view. The longitudinal axis 109a of the helix 12a and the longitudinal axis 110a of the first leg 20a enclose the first inclination angle 26a. In the present case, the first leg 20a has a length of approximately 65 mm. In the present case, the second leg 22a has a length of approximately 65 mm. The first inclination angle 26a in the present case is approximately 60. However, other values for a first inclination angle are also conceivable, for example 30, 45, 75, or smaller or larger values, or values therebetween.

(25) FIG. 4 shows a portion of the helix 12a which comprises the first leg 20a, the second leg 22a and the bend point 24a, in different views. FIG. 4a shows a view in the longitudinal direction 28a of the helix 12a. FIG. 4b shows the first leg 20a, the second leg 22a and the bend point 24a in a transverse view perpendicular to the longitudinal direction 28a of the helix 12a and in the plane of main extent of the helix 12a. FIG. 4c shows a view in the frontal direction 54a. FIG. 4d shows a perspective view. In the transverse view, the bend point 24a runs, at least section-wise, with a second inclination angle 30a, which differs from the first inclination angle 26a, with respect to the longitudinal direction 28a of the helix 12a. In the transverse view, the bend point 24a has a longitudinal axis 114a. The longitudinal axis 114a of the bend point 24a and the longitudinal axis 109a of the helix 12a enclose the second inclination angle 30a.

(26) The second inclination angle 30a deviates from the first inclination angle 26a by at least 5. The second inclination angle 30a has a value between 25 and 65. Furthermore, the first inclination angle 26a is greater than 45. In the present case, the first inclination angle 26a amounts to approximately 60. Furthermore, in the present case, the second inclination angle 30a amounts to approximately 45. The second inclination angle 30a is smaller than the first inclination angle 26a.

(27) It is, of course, also conceivable that a first inclination angle and a second inclination angle are identical. For example, a first inclination angle and a second inclination angle can both be in each case at least substantially or exactly 45. Other values are also conceivable, for example 30 or 35 or 40 or 50 or 55 or 60 or 65 or 70, or further values, in particular even larger or even smaller values. A person skilled in the art will choose values for a first inclination angle and a second inclination angle in a suitable manner, in particular so as to depend on a list of requirements pertaining to a corresponding wire netting.

(28) In the transverse view, the bend point 24a, at least section-wise, follows an at least approximately straight profile. In the present case, in the transverse view, a major part of the bend point 24a follows the straight profile.

(29) In the transverse view, the helix 12a, at least section-wise, follows a stepped profile. The stepped profile is obliquely stepped.

(30) The first leg 20a, at least section-wise, follows a straight profile. In the present case, the first leg 20a follows a straight profile. The second leg 22a, at least section-wise, follows a straight profile. In the present case, the second leg 22a follows a straight profile. The first leg 20a and/or the second leg 22a are free from a curvature and/or a bend and/or a kink. The bend point 24a comprises a profile which, in a longitudinal view parallel to the longitudinal direction 28a of the helix 12a, describes a bend through 180. FIG. 4a illustrates the helix 12a in the longitudinal view.

(31) The first leg 20a runs, at least section-wise, in particular entirely, in a first plane, and the second leg 22a runs, at least section-wise, in particular entirely, in a second plane which is parallel to the first plane. In the longitudinal view, the first leg 20a runs parallel to the second leg 22a.

(32) The further helix 14a has a further bend point 32a. The bend point 24a and the further bend point 32a are connected. The bend point 24a and the further bend point 32a form a linking point of the helix 12a and of the further helix 14a.

(33) FIG. 5 shows a part of the wire netting 10a, which comprises the bend point 24a and the further bend point 32a, in different views. FIG. 5a shows a view in the longitudinal direction 28a of the helix 12a. FIG. 5b shows the part of the wire netting 10a in a transverse view perpendicular to the longitudinal direction 28a of the helix 12a in the plane of main extent of the helix 12a. FIG. 5c shows a view in the frontal direction 54a. FIG. 5d shows a perspective view.

(34) The helix 12a and the further helix 14a cross one another at least substantially perpendicularly in a region of the further bend point 32a. In the transverse view, the bend point 24a and the further bend point 32a enclose an intersection angle 118a. The intersection angle 118a is dependent on the second inclination angle 30a and on a correspondingly defined further second inclination angle of the further helix 14a. In the present case, the intersection angle 118a amounts to 90.

(35) For other first inclination angles, too, a second inclination angle of 45 is advantageously selected, such that correspondingly designed helices cross one another perpendicularly at connecting points, and said connecting points advantageously have a high mechanical load-bearing capacity. Of course, intersection angles that differ from 90 are also conceivable, for example having a value of 45 or 60 or 120 or 145, or a larger or smaller value, or a value therebetween. A person skilled in the art will choose an intersection angle in a suitable manner, in particular so as to depend on a list of requirements pertaining to a corresponding wire netting.

(36) FIG. 6 shows a bending device 200a for producing the wire netting 10a. FIG. 7 shows a part of the bending device 200a in a schematic lateral view. FIG. 8 shows the part of the bending device 200a in a schematic plan view. The bending device 200a is configured for producing the wire netting 10a. When a longitudinal element that is not embodied as a single wire, such as for example a strand and/or a wire bundle or the like, is used instead of the wire 18a, the said longitudinal element is processed and/or guided and/or bent and/or aligned, etc. in a manner analogous to the wire 18a. However, the case in which the longitudinal element 16a is embodied as the wire 18a is described hereunder.

(37) The bending device 200a has a bending unit 202a for producing a helix blank 210a. The bending unit 202a comprises a guide worm 204a and a braiding knife 208a which is rotatable relative to the guide worm 204a about a rotation axis 206a. The bending unit 202a is configured for producing the helix blank 210a. The bending unit 202a is configured for producing the helix blank 210a by a bending of the wire 18a. The helix blank 210a comprises two curved legs 212a, 214a, as well as a bend point 216a that connects the curved legs 212a, 214a. The helix blank 210a comprises a plurality of curved legs 212a, 214a which for reasons of clarity are not all provided with reference signs. The wire 18a in the bending is bent about the braiding knife 208a so as to form the helix blank 210a. The helix blank 210a in the bending about the braiding knife 208a is made so as to have curved legs 212a, 214a. The legs 212a, 214a in the bending about the braiding knife 208a are provided with a curvature, in particular by virtue of the high tensile strength of the wire 18a. The wire 18a in a rotation of the braiding knife 208a around the rotation axis 206a is bent so as to form the helix blank 210a.

(38) The bending unit 202a in the present case is configured for simultaneously making a further helix blank 236a in addition to the helix blank 210a, said further helix blank 236a being in particular at least substantially identical to the helix blank 210a. The further helix blank 236a is made from a further wire 238a which is in particular embodied at least substantially identically to the wire 18a. The wire 18a and the further wire 238a are wound about the braiding knife 208a so as to be mutually spaced apart. The wire 18a and the further wire 238a are simultaneously bent in the rotation of the braiding knife 208a around the rotation axis 206a.

(39) The bending device 200a comprises a braiding unit which is configured for braiding the helix blank 210a into a pre-netting 220a of the wire netting 10a. The braiding unit in the present case is configured for producing the wire netting 10a. The helix blank 210a after being braided is cut to length so as to correspond to a width of the pre-netting 220a, or of the wire netting 10a, respectively. Furthermore, the helix blank 210a at the ends thereof is knotted to neighboring helices and/or helix blanks, and thereafter forms a helix of the pre-netting 220a. After the helix blank 210a has been braided, advancing of the pre-netting 220a in a feed direction 240a is performed. A next helix blank can subsequently be braided into the pre-netting 220a that thereupon is extended. After an envisaged number of helices have been added to the pre-netting 220a, the latter forms the wire netting 10a. Of course, intervening post-processing steps such as, for example, coating and/or varnishing and/or adding further braided netting elements and/or adding edge elements or the like, are conceivable.

(40) The bending device 200a has a straightening unit 222a which is configured for at least partially straightening the curved legs 212a, 214a. The straightening unit 222a is configured for straightening the curved legs 212a, 214a. The straightening unit 222a is configured for a bending and/or post-processing and/or straightening of the curved legs 212a, 214a as well as the bend point 216a of the helix blank 210a in such a manner that said legs 212a, 214a and said bend point 216a are shaped so as to correspond to the geometry of the legs 20a, 22a and of the bend point 24a of the helix 12a. A braided netting from non-straightened helix blanks would have bulged loops as well as a front and rear side with multiple bulges and/or curves, whereas the wire netting 10a from straightened helix blanks 210a has legs 20a, 22a running in parallel planes and correspondingly a parallel front and rear side.

(41) The straightening unit 222a is configured for compressing the helix blank 210a in a pressing direction 224a perpendicular to the rotation axis 206a. The pressing direction 224a runs perpendicularly to a longitudinal direction 226a of the helix blank 210a. The straightening unit 222a in the present case is configured for pressing the helix blank 210a from two opposite sides 242a, 244a. In the pressing, a transverse extent 44a of the helix blank 210a, perpendicular to the longitudinal direction 226a of the helix blank 210a, is reduced in size. An operating state of the bending device 200a shortly before straightening the curved legs 212a, 214a is illustrated in FIG. 8. In a next operating state, adjoining the operating state illustrated, the curved legs 212a, 214a are introduced into the straightening unit 222a and straightened therein in that the helix blank 210a is compressed.

(42) The compressing of the helix blank 210a includes over-pressing and/or over-bending of the curved legs 212a, 214a. The curved legs 212a, 214a are pressed toward one another. The curved legs 212a are pressed toward the rotation axis 206a. The curved legs 212a, 214a are in each case over-pressed by an over-pressing distance 246a, 248a. The helix blank 210a, after being compressed, partially springs back, in particular by virtue of the high tensile strength of the wire 18a. In order for the geometry of the helix 12a described above to be implemented, the helix blank 210a has to be temporarily correspondingly pressed and/or compressed beyond this geometry, in particular in order for the mentioned spring-back of the helix blank 210a after the compressing to be equalized.

(43) The straightening unit 222a is supported so as to be rotatable around the rotation axis 206a. The straightening unit 222a in the present case is rotated in an operation of the bending device 200a. The straightening unit 222a in the operation is rotated in the same direction as the braiding knife 208a. The pressing direction 224a conjointly rotates so as to correspond to the rotation of the straightening unit 222a.

(44) The rotation of the braiding knife 208a and a rotation of the straightening unit 222a are synchronized. The straightening unit 222a in the present case is mechanically coupled to the braiding knife 208a so that the straightening unit 222a can be set in rotation conjointly with the braiding knife 208a. The rotation of the straightening unit 222a and a rotation of the helix blank 210a about the rotation axis 206a are synchronized. The straightening unit 222a in the operation is non-rotated relative to the braiding knife 208a and/or relative to the helix blank 210a. In the rotation of the straightening unit 222a around the rotation axis 206a the pressing direction 224a conjointly rotates in such a manner that the orientation of the latter relative to the helix blank 210a is constant or at least approximately constant. The pressing direction 224a is non-rotated relative to the helix blank 210a.

(45) The straightening unit 222a has a pressing element 228a which is movable perpendicularly to the longitudinal direction 226a of the helix blank 210a. The pressing element 228a when compressing is moved in the pressing direction 224a toward the rotation axis 206a and/or toward the helix blank 210a. The pressing element 228a when compressing pushes against a curved leg to be straightened. The pressing element 228a, after the compressing, is moved counter to the pressing direction 224a away from the rotation axis 206a and/or from the helix blank 210a. A movement of the pressing element 228a in the pressing direction 224a and counter to the pressing direction 224a is coupled to the rotation of the straightening unit 222a and/or to the rotation of the braiding knife 208a. The pressing element 228b in the present case is dimensioned such that said pressing element 228b when compressing simultaneously straightens a plurality of legs, in the case shown three legs. Furthermore, the helix blank 210a and the further helix blank 236a are simultaneously straightened in the case shown. Of course, it is conceivable that only one helix blank is simultaneously bent and straightened. It is furthermore conceivable that a pressing element is differently dimensioned and, for example, when compressing simultaneously pushes only against one or two legs, or else against a larger number of legs, for example against four or five or six or ten or 20 or 30, or even more. A number of simultaneously pressed legs can in particular depend on a geometry of a helix blank, for example on a leg length and/or on a geometry of a bend point and/or on a first inclination angle and/or on a second inclination angle.

(46) The pressing element 228a has a pressing surface 260a which is in a compression pushed against the helix blank 210a. The pressing surface 260a is illustrated as being straight in FIG. 8. It is also conceivable that a pressing surface is in particular implemented so as to be convexly curved and/or pre-bulged. A type of over-pressing and/or a type of over-bending can in particular be defined by a geometry of a pressing surface. For example, a pressing element can be configured for over-pressing and/or over-bending curved legs to a different degree at different points of the legs, for example to a higher degree in a central region of the legs.

(47) The straightening unit 222a in the present case has a further pressing element 230a. The further pressing element 230a is embodied mirror-symmetrically to the pressing element 228a, in particular in relation to a symmetry plane in which the rotation axis 206a runs. The further pressing element 230a is embodied identically to the pressing element 228a. The further pressing element 230a is movable perpendicularly to the rotation axis 206a. A movement of the further pressing element 230a is coupled to a movement of the pressing element 228a. The pressing element 228a and the further pressing element 230a in the operation move in each case in opposite directions. The pressing element 228a and the further pressing element 230a in the compressing press the helix blank 210a from the opposite sides 242a, 244a.

(48) The pressing element 228a is disposed in an outlet region 232a of the bending unit 202a. The pressing element 228a in the present case is disposed so as to be spaced apart from the braiding knife 208a by approximately 10 cm. In the production of the wire netting 10a the bent helix blank 210a exits the bending unit 202a and enters the straightening unit 222a. After the straightening of the curved legs 212a, 214a, the helix blank 210a runs into the braiding unit and therein is braided into the pre-netting 220a. The helix blank 210a is braided into the pre-netting 220a in a straightened state. The further pressing element 230a is disposed in the outlet region 232a of the bending unit 202a.

(49) The bending unit 202a is configured for a processing of a wire having a tensile strength of at least 800 N mm.sup.2. The straightening unit 222a is configured for a processing of a wire having a tensile strength of at least 800 N mm.sup.2. The bending unit 202a and the straightening unit 222a in the present case are configured for a processing of the wire 18a.

(50) FIG. 9 shows a schematic flow diagram of a method for producing the wire netting 10a. The wire netting 10a is produced by means of the bending device 200a.

(51) In a first method step 250a, the helix blank 210a is made by a bending of the wire 18a by means of the bending device 200a. The helix blank 210a after the bending thereof has curved legs 212a, 214a.

(52) The curved legs 212a, 214a are straightened in a second method step 252a. The second method step 252a is carried out after the first method step 250a.

(53) The helix blank 210a is braided into the pre-netting 220a of the wire netting 10a in a third method step 254a. The third method step 254a is carried out after the second method step 252a.

(54) The helix blank 210a before being braided into the pre-netting 220a is pressed at least section-wise for a straightening of the curved legs 212a, 214a. The curved legs 212a, 214a are over-bent and/or over-pressed for the straightening. The legs 212a, 214a in an over-pressed state are closer to a longitudinal axis 256a of the helix blank 210a than in the completed state in which the legs 212a, 214a have a geometry that corresponds to the geometry of the helix 12a of the wire netting 10a. The longitudinal axis 256a of the helix blanks 210a runs so as to be parallel to the longitudinal direction 226a of said helix blank 210a. In the production, the longitudinal axis 256a of the helix blank 210a corresponds to the rotation axis 206a. The longitudinal axis 256a of the helix blank 210a runs through a center of gravity of the helix blank 210a.

(55) A further exemplary embodiment of the invention is shown in FIGS. 10 and 11. The following descriptions and the drawings are restricted substantially to the differences between the exemplary embodiments, wherein, with regard to identically designated components, in particular with regard to components with the same reference signs, reference may basically also be made to the drawings and/or to the description of the other exemplary embodiment, in particular of FIGS. 1 to 9. To distinguish between the exemplary embodiments, the letter a has been added to the reference signs of the exemplary embodiment in FIGS. 1 to 9. In the exemplary embodiments of FIGS. 10 and 11, the letter a has been replaced by the letter b.

(56) FIG. 10 shows a part of a further bending device 200b for producing a further wire netting 10b in a schematic illustration. The further wire netting 10b has a plurality of helices 12b which are braided with one another and which form square loops. The helices 12b have straight legs 20b, 22b which run in parallel planes. The legs 20b 22b are connected by way of bend points 24b, the profile of the latter describing a bend of 180. The helices 12b at the ends 258b thereof are knotted in the completed further wire netting 10b. The further bending device 200b for knotting the helices 12b has a knotting unit (not shown).

(57) The further bending device 200b has a bending unit (not shown) which, in a manner analogous to that of the bending unit 202a of the exemplary embodiment in FIGS. 1 to 9, is configured for producing a helix blank 210b having curved legs 212b, 214b from a longitudinal element 16b having at least one wire 18b that comprises steel. The longitudinal element 16b in the present case is realized, for example, as a wire strand from a plurality of twisted wires 18b. However, it is likewise conceivable that the longitudinal element 16b is embodied as a single wire or a wire bundle or the like. The curved legs 212b, 214b are connected by way of a bend point 216b. The bending device 200b has a braiding unit 218b which is configured for braiding the helix blank 210b into the pre-netting 220b.

(58) The further bending device 200b has a straightening unit 222b which is configured for at least partially straightening the curved legs 212b, 214b. The straightening unit 222b is configured for straightening the curved legs 212b, 214b. The straightening unit 222b is configured for a bending of the helix blank 210b in such a manner that the geometry of the latter corresponds to a geometry of the helices 12b of the completed further wire netting 10b.

(59) The straightening unit 222b is configured for compressing the helix blank 210b. The compressing includes over-pressing and/or over-bending of the curved legs 212b, 214b. The curved legs 212b, 214b in the compressing are compressed further than would correspond to a target geometry, so as to equalize a spring-back of the wire 18b after the compressing.

(60) The straightening unit 222b has a pressing element 228b which is movable perpendicularly to the longitudinal direction 226b of the helix blank 210b. The pressing element 228b is disposed in a proximity 234b of the braiding unit 218b. The pressing element 228b defines a maximum length of the helix 12b. The pressing element 228b is configured for simultaneously straightening the helix blank 210b across the entire length thereof. A length of the pressing element 228b corresponds to a maximum length of a helix blank 210b which can be straightened by means of the straightening unit 222b.

(61) The straightening unit 222b in the present case has a further pressing element 230b. The pressing element 228b and the further pressing element 230b are disposed in a mutually opposite manner. The pressing element 228b for the compressing is movable toward the further pressing element 230b. The pre-netting 220b is disposed between the pressing element 228b and the further pressing element 230b. The further pressing element 230b forms a counter-holding element which, when pressing the helix blank 210b by means of the pressing element 228b, supports the helix blank 210b from a side that is opposite the pressing element 228b. When advancing the pre-netting 220b, the latter is pushed through the straightening unit 222b. The pre-netting 220b in the advancing is pushed over the further pressing element 230b.

(62) FIG. 11 shows a schematic flow diagram of a method for producing the further wire netting 10b. The further wire netting 10b is produced by means of the further bending device 200b.

(63) In a first method step 250b, the helix blank 210b is made by a bending of the wire 18b by means of the bending device 200b. The helix blank 210b after the bending thereof has curved legs 212b, 214b.

(64) In a second method step 252b, the helix blank 210b is braided into the pre-netting 220b of the wire netting 10b. The second method step 252b is carried out after the first method step 250b.

(65) In a third method step 254b, the helix blank 210b is straightened. The helix blank 210b after being braided into the pre-netting 220b is pressed at least section-wise for a straightening of the curved legs 212b, 214b. In the present case, the entire helix blank 210b is simultaneously pressed. The helix blank 210b is straightened by means of the straightening unit 222b in the third method step 254b. The third method step 254b is carried out after the second method step 252b.

(66) FIGS. 12 to 16 show alternative implementations of pressing elements 228c, 228d, 228e, 228f, 228g. The dimensions and geometries shown are to be understood as being purely exemplary. In particular, the alternative pressing elements 228c, 228d, 228e, 228f, 228g shown can be configured for pressing single or a plurality of legs, or else entire helix blanks, and have corresponding dimensions. In principle, it is furthermore conceivable that elements and/or features shown of the pressing elements 228c, 228d, 228e, 228f, 228g are present on the latter in multiples, or a pressing element has said elements and/or features in multiples, respectively, so as to optionally accomplish a simultaneous straightening of a desired number of legs. Moreover, pressing elements which have the features shown in multiples, in particular in combination, are of course conceivable.

(67) FIG. 12 shows a first alternative pressing element 228c in a schematic illustration. The first alternative pressing element 228c has a pressing surface 260c that is pre-bulged multiple times in a convex manner. The pressing surface 260c in the present case, which is to be understood to be purely exemplary, has two pre-bulged features. A number of pre-bulged features advantageously corresponds to a number of portions between bend points of a helix blank to be straightened in which legs of the helix blank can be straightened. The pre-bulged pressing surface 260c enables over-pressing of legs to be straightened.

(68) FIG. 13 shows a second alternative pressing element 228d in a schematic illustration. The second alternative pressing element 228c has a pressing surface 260d having a projecting tip 262d. The tip 262d enables over-pressing of legs to be straightened. The pressing surface 260d in the case shown has only one tip 262d. A number of tips 262d is of course adaptable to a requirement of a straightening. Other geometries, which in particular project at least section-wise and which are in particular different from pre-bulged features and/or tips, are in particular also conceivable.

(69) FIG. 14 shows a third alternative pressing element 228e in a schematic sectional illustration. The pressing element 228e has a movable over-pressing element 264e. The over-pressing element 264e is supported so as to be deployable from a pressing surface 260d of the third alternative pressing element 228e. A movement of the over-pressing element 264e is advantageously adapted to and/or synchronized with a movement of the pressing element 228e and/or a manufacturing cycle and/or a helix advancement. When straightening a leg, the pressing surface 260d can be brought to bear on the leg and the latter can be straightened and in particular over-pressed by means of deploying the over-pressing element 264e. It is conceivable that an over-pressing distance is adaptable by means of open-loop and/or closed-loop controlling of the deployment of the over-pressing element 264e, for example adaptable to a geometry and/or material characteristic and/or flexural rigidity of a helix blank to be straightened.

(70) The third alternative pressing element 228e advantageously has at least one corresponding over-pressing element 264e for each leg to be straightened. The over-pressing element 264e can in particular be adapted to a profile and/or a geometry of a helix blank and/or leg to be straightened, and/or be configured for guiding said helix blank and/or leg to be straightened.

(71) FIG. 15 shows a fourth alternative pressing element 228f in a schematic illustration. The fourth alternative pressing element 228f has a pressing surface 260f having a guide groove 266f. When straightening, a helix blank 236f to be straightened can be guided at least section-wise by the guide groove 266f. Any lateral slipping and/or evading by a helix blank to be straightened, in particular when over-pressing, can be advantageously prevented on account thereof.

(72) FIG. 16 shows a fifth alternative pressing element 228g in a schematic illustration. The fifth alternative pressing element 228g has a pressing surface 260g. The fifth alternative pressing element 228g furthermore has guide elements 268g, 270g. The guide elements 268g, 270g are embodied as bolts. When straightening, a helix blank 236g to be straightened can be guided at least section-wise by the guide elements 268g, 270g. Any lateral slipping and/or evading by a helix blank to be straightened, in particular when over-pressing, can be advantageously prevented on account thereof. The pressing element 228g in the present case, which is to be understood as being purely exemplary, has two guide elements 268g, 270g. However, it is conceivable that a pressing element has a larger number of guide elements, in particular in the case of a plurality of legs having to be simultaneously straightened and/or guided. It is furthermore conceivable for a leg to be guided by more than two guide elements.

LIST OF REFERENCE SIGNS

(73) 10 Wire netting 12 Helix 14 Helix 16 Longitudinal element 18 Wire 20 Leg 22 Leg 24 Bend point 26 Inclination angle 28 Longitudinal direction 30 Inclination angle 32 Bend point 44 Transverse extent 54 Frontal direction 109 Longitudinal axis 110 Longitudinal axis 112 Direction of main extent 114 Longitudinal axis 118 Intersection angle 200 Bending device 202 Bending unit 204 Guide worm 206 Rotation axis 208 Braiding knife 210 Helix blank 212 Leg 214 Leg 216 Bend point 218 Braiding unit 220 Pre-netting 222 Straightening unit 224 Pressing direction 226 Longitudinal direction 228 Pressing element 230 Pressing element 232 Outlet region 234 Proximity 236 Helix blank 238 Wire 240 Feed direction 242 Side 244 Side 246 Over-pressing distance 248 Over-pressing distance 250 Method step 252 Method step 254 Method step 256 Longitudinal axis 258 End 260 Pressing surface 262 Tip 264 Over-pressing element 266 Guide groove 268 Guide element 270 Guide element