Method for determining bend deduction of sheet metal workpiece to be bent
阅读说明：本技术 要进行折弯的金属板工件的折弯扣除的确定方法 (Method for determining bend deduction of sheet metal workpiece to be bent ) 是由 哈拉尔·克奈丁格 于 2018-12-19 设计创作，主要内容包括：本发明涉及一种用于估算围绕n条折弯轴线并以n个折弯角alpha进行折弯的金属板工件的长度减小量的方法,具有以下步骤：经折弯的金属板工件包括沿延伸线延伸的n+1个分支以及通过使金属板工件折弯而产生的并在两个相邻的分支之间延伸的n个弧形部。(The invention relates to a method for estimating the reduction in length of a sheet metal workpiece bent around n bending axes and at n bending angles alpha, comprising the following steps: the bent sheet metal workpiece comprises n +1 branches extending along an extension line and n arc-shaped portions which are produced by bending the sheet metal workpiece and extend between two adjacent branches.)
1. A method for estimating the shortened length of a sheet metal workpiece bent around n bending axes and at n bending angles alpha, comprising the following method steps, wherein the bent sheet metal workpiece comprises n +1 branches extending along a straight extension line and n arcs generated by bending the sheet metal workpiece and extending between two adjacent branches:
-determining L0 the original length of the sheet metal strip before bending the sheet metal workpiece,
determining the intersection of straight extension lines of adjacent branches or straight lines parallel to the straight extension lines, which straight lines extend at the surfaces of the branches facing away from the respective bending axis,
determining i distances A1, A2 between the intersection point and the free end of the branch, and optionally j distances B1 between the intersection points if n > 2,
-determining the tangential shortening T according to the following formula:
wherein n is 1, 2, 3 … ….
2. A method for estimating the shortened length of a sheet metal strip bent around n bending axes and at n bending angles alpha < 90 °, comprising the following method steps, wherein the bent sheet metal workpiece comprises at least n +1 branches extending along a straight extension line and n arcs generated by bending the sheet metal workpiece and extending between two adjacent branches:
-determining L0 the original length of the sheet metal strip before bending the sheet metal workpiece,
determining k edge lengths C of the bent sheet metal workpiece, each representing a distance measured parallel to a straight extension line of the branch from a free end of the branch to a tangent point at which a tangent to the first straight extension line is tangent to the arc,
optionally determining i edge lengths D of the bent sheet metal workpiece, which edge lengths D represent the distances measured parallel to the straight extension line of the branches from the tangent point to further tangent points at which a tangent to the straight extension line is tangent to the arc,
-calculating the edge shortening length K according to the following formula:
3. an apparatus for determining the edge shortening length of a sheet metal workpiece (1) according to claim 2, comprising a first measuring element surface (22) and a second measuring element surface (23), wherein the first measuring element surface (22) and the second measuring element surface (23) are at right angles to each other.
4. A device according to claim 3, characterized in that the length L2 of the second measuring element surface (23) is smaller than the edge length C to be determined.
Technical Field
The invention relates to a method for estimating the shortened length of a sheet metal workpiece which is bent around n bending axes and at n bending angles alpha, wherein the bent sheet metal workpiece comprises n +1 branches extending along a straight extension line and n arc-shaped portions which are generated by bending the sheet metal workpiece and extend between two adjacent branches.
The letter n represents a natural number; i.e., n is 1, 2, 3, 4 … ….
Background
The difficulty in bending the sheet metal strip about the bending axis is to select the original length of the sheet metal strip such that the bent sheet metal strip has defined dimensions. During the bending operation, compression is generated inside the bending zone while the material outside the bending zone is stretched, according to standard teachings, based on the workpiece to be bent. The degree of compression and tension of the workpiece inside and outside the bend is difficult to predict due to a number of influencing factors.
DE112012000792 proposes a method for determining the original dimensions of a sheet metal workpiece prior to bending into a sheet metal configuration, which method is based on the determination of the length H3 and the determination of the angle. When viewing a triangular, bent workpiece, the length H3 substantially corresponds to the height of the triangle.
The method according to the invention differs from the method disclosed in DE112012000792 in that it can be performed without determining the length H3 and without determining the angle and can therefore be performed in a simple manner.
EP1398094 relates to a method for determining the arm length of a bending part in a bending device. However, in EP1398094 there is no hint to determine the shortening length as part of the method according to the present invention. EP1398094 is in particular limited to determining one arm length.
EP2683504 describes a method for dynamically correcting the bending angle of a metal sheet in a panel bending machine. The method described therein is based in particular on the determination of the nominal bending angle and the distance between the bending punch and the bent metal sheet after the bending punch has been brought back into the retracted position. The method to be described below does not require the determination of these parameters.
DE10009074 relates to a method for cold bending or rotary bending of workpieces and to a device for determining the position of a workpiece leg during bending. In DE10009074, there is no hint to the determination of the length and distance and the calculation of the shortening described in the method according to the invention.
DE10163956 describes a method and a device for measuring the length on a workpiece deformed by bending. In DE10163956, there is no hint to the calculation of the shortening described in the method according to the invention.
The method according to the prior art is generally not easy to perform. The object of the present invention is to overcome the drawbacks of the prior art of determining the reduction of a sheet metal workpiece due to a bending process about a bending axis.
Disclosure of Invention
The invention discussed below is particularly aimed at the object of being able to determine the amount of shortening that occurs when bending a sheet metal workpiece in as simple a way as possible and with as high an accuracy as possible in terms of estimation. With the method according to the invention, the change in the bending properties of the sheet metal workpieces to be bent, in particular in view of the resulting shortening, should be determined particularly simply.
The above object is achieved by a method according to the claims.
The method according to the invention mainly, but in a non-limiting manner, maintains a constant sheet metal piece for a thickness over the surface within the range of the sheet metal piece. This does not exclude that the thickness may vary, for example, within the boundaries defined by the relevant standards.
The method according to the invention is primarily directed to bending sheet metal workpieces produced by cold bending with the aid of a die bending tool. The bent sheet metal workpiece can be produced according to DIN 6935.
The amount of shortening produced by bending a sheet metal workpiece about a bending axis can be estimated by determining the amount of tangential shortening, the method for tangential shortening comprising the steps of:
-determining L0 the original length of the sheet metal strip before bending the sheet metal workpiece,
determining the intersection of straight extension lines of adjacent branches or straight lines parallel to the straight extension lines, which straight lines extend at the surfaces of the branches facing away from the respective bending axis,
determining i distances A1, A2 between the intersection point and the free end of the branch, and optionally j distances B1 between the intersection points if n > 2,
-determining the tangential shortening T according to the following formula:
a sheet metal workpiece having n-1 bending axes includes two legs and an arcuate portion extending between the legs. Thus, only the distances a1 and a2 may be determined.
A sheet metal workpiece having 2 bending axes includes three legs and two arcuate portions extending between two adjacent legs. Thus, two distances a1, a2, and one distance B1 may be determined.
The number of distances a that can be determined and the number of distances B that can be determined are predefined by geometrical conditions.
An estimation of the reduction produced by bending a sheet metal workpiece about a bending axis can be made by determining the edge reduction, the method for tangential reduction comprising the steps of:
-determining L0 the original length of the sheet metal strip before bending the sheet metal workpiece,
determining k edge lengths C of the bent sheet metal workpiece, each representing a distance measured parallel to a straight extension line of the branch from a free end of the branch to a tangent point at which a tangent to the first straight extension line is tangent to the arc,
optionally determining i edge lengths D of the bent sheet metal workpiece, which edge lengths D represent the distances measured parallel to the straight extension line of the branches from the tangent point to further tangent points at which a tangent to the straight extension line is tangent to the arc,
-calculating the edge shortening length K according to the following formula:
a sheet metal workpiece having n-1 bending axes includes two legs and an arcuate portion extending between the legs. Thus, only the distances C1 and C2 may be determined.
A sheet metal workpiece having 2 bending axes includes three legs and two arcuate portions extending between two adjacent legs. Thus, two distances C1, C2 and one distance D1 may be determined.
The number of distances C that can be determined and the number of distances D that can be determined are predefined by the geometrical conditions.
The invention also relates to a device for determining the edge shortening length of a sheet metal workpiece, comprising a first measuring element surface and a second measuring element surface, wherein the first measuring element surface and the second measuring element surface are arranged at right angles to each other.
The measuring element surface is designed such that a surface of a branch of the sheet metal tool can be placed against the measuring element surface, and the edge length of the sheet metal tool can be determined by determining the distance between the intersection of the free end of the sheet metal tool and the measuring element surface.
Such a device according to the invention may comprise a contact-type measuring device and/or a non-contact-type measuring device for determining the distance between the intersection of the free end and the surface of the measuring element.
The length L2 of the second measuring element surface that makes contact with the branch having the edge length to be determined may be less than the edge length C to be determined, this form allows the edge length C to be determined by overhang measurements.
Drawings
For a better understanding of the invention, reference will now be made in detail to the accompanying drawings.
These figures are each shown in a very simplified schematic representation:
FIG. 1 shows the geometric proportions of a sheet metal workpiece bent about a bending axis and having a bending angle alpha < 90 DEG for determining the amount of edge shortening;
FIG. 2 shows the geometric scale of a sheet metal workpiece bent about a bend axis and having a bend angle of 90 ° < alpha < 180 ° for determining the amount of edge shortening;
FIG. 3 shows the geometric scale of a sheet metal workpiece bent about two bending axes and having a bending angle of 90 ° < alpha < 180 ° for determining the amount of edge shortening;
FIG. 4 shows the geometric proportions of a sheet metal workpiece bent about a bending axis and having a bending angle alpha < 90 DEG for determining the tangential shortening;
FIG. 5 shows a measuring device for determining the amount of tangential shortening;
FIG. 6 shows the geometric proportions of a sheet metal workpiece bent about two bending axes and having a bending angle alpha < 90 DEG for determining the tangential shortening;
FIG. 7 illustrates a possible approach for determining the amount of tangential shortening;
fig. 8 shows the determination of the tangential shortening of a multi-bent sheet metal workpiece.
Detailed Description
It is noted, first, that in the different embodiments described, identical parts have identical reference numerals and/or identical component names, wherein the disclosure contained throughout the description may be similarly transferred to identical parts having identical reference numerals and/or identical component names. Furthermore, selected positional specifications in the specification, such as on the top, on the bottom, on the side, refer to the figures described and depicted directly, and in the case of a change of position, these positional specifications should similarly be transferred to the new position. For purposes of clarity, not all elements may be provided with a reference numeral in all figures.
Fig. 1 and 2 show the lengths and distances to be determined on a sheet metal workpiece 1, which sheet metal workpiece 1 has been bent around a bending axis 2 at a bending angle alpha. The determination of the tangential shortening T mentioned in the description of fig. 1 and 2 as a method according to the invention for estimating the shortening produced during bending of a sheet metal workpiece about a bending axis 2 oriented perpendicularly to the drawing of fig. 1 and 2 is possible for all bending angles alpha < 180 °. Fig. 1 shows a sheet metal workpiece 1 bent about a bending axis 2 at a bending angle alpha < 90 °, and fig. 1 shows the sheet metal workpiece 1 bent about the bending axis 2 at a bending angle 90 ° < alpha < 180 °.
The sheet metal workpieces 1 shown in fig. 1 and 2 each have a bending axis 2, so that n is 1.
The bent bending workpieces 1 shown in fig. 1 and 2 each include: a first branch 3, the first branch 3 extending along a first straight extension line 4; a second branch 5, the second branch 5 extending along a second straight extension 6; and an arcuate portion 7, the arcuate portion 7 extending between the first branch 3 and the second branch 5. The respective transition between the limbs 3, 4 and the arc 7 is geometrically defined by an extension of the limbs 3, 4 and a polygonal extension of the arc 7, wherein a first transition point 14 between the first limb 3 and the arc 7 and a second transition point 15 between the second limb 5 and the arc 7 are difficult to determine on the sheet metal workpiece 1.
The arc 7 has a polygonal shape, wherein the first branch 3 and/or the first straight extension 4 and the second branch 5 and/or the second straight extension 5 are each tangent to an end point of the arc 7.
A person skilled in the art is able to determine, using measuring methods according to the prior art, the original length L0 of the sheet metal workpiece, not shown in any of the figures, before the sheet metal workpiece 1 is bent about the bending axis 2, the original length L0 is defined as the length measurable between the free ends 12, 13 of the sheet metal workpiece 1.
The person skilled in the art determines an additional circled intersection S between the first line 8 and the second line 9, the first line 8 and the second line 9 being lines parallel to the first straight extension 4 and/or the second straight extension 6. The first straight line 8 is a straight line parallel to the first straight extension line 4, which first straight line 8 is tangent to the first outer surface 10 of the first branch 3. The second line 9 is a line parallel to the second straight extension 6, which second line 9 is a tangent to the second outer surface 11 of the second branch 5.
The intersection point S may be determined by arranging a first measuring element against the first outer surface 10 and a second measuring element against the second outer surface 11. The measuring elements placed against the outer surface have their edges placed against the surface extending in line with the first line 8 and/or the second line 9.
After determining the intersection point S, one skilled in the art is able to determine the lengths a1 and a2 represented in fig. 1. By definition, the length a1 is the length measured between the first free end 12 of the first branch 3 and the point of intersection S. By definition, the length a2 is the length measured between the second free ends 13 of the second branches 5.
The person skilled in the art determines the tangential shortening T from the measured original length L0 of the sheet metal workpiece using the length a1 and the length a2, according to the formula T L0-a 1-a 2.
The method according to the invention for estimating the shortening of a sheet metal workpiece can also be applied to a bent sheet metal workpiece comprising n branches. Fig. 3 shows the application of the method according to the invention to a sheet metal workpiece 1 comprising a first branch 3, a second branch 5, and a third branch 24. The first arc-shaped portion 7 extends between the first branch 3 and the second branch 5, and the second arc-shaped portion 25 extends between the second branch 5 and the third branch 24. The first arc-shaped portion 7 is produced by bending the sheet metal work 1 about a first bending axis 2, and the second arc-shaped portion 25 is produced by bending the sheet metal work 1 about a second bending axis 26. Fig. 3 relates to a specific case in which the sheet metal workpiece 1 is bent at a bending angle alpha during bending about the first bending axis 2 and during bending about the second bending axis 26.
The first branch 3 extends along a first straight extension line 4, and the second branch 5 and the third branch 24 extend along a second straight extension line 6 and/or along a third straight extension line 27.
The person skilled in the art determines a first intersection point S1 being the intersection point of the first straight line 8 and the second straight line 9. Intersections S1 and S2 are additionally circled in FIG. 3. The first straight line 8 extends in a first surface 10 of the first branch 3, which first surface 10 faces away from the first bending axis 2 and is parallel to the first straight extension line 4. The second straight line 9 extends in a second surface 11 of the second branch 5, which second surface 11 faces away from the first bending axis 2 and is parallel to the second straight extension line.
Then, a second intersection S2, which is an intersection of the third straight line 28 and the fourth straight line 29, is determined. A third straight line 28 extends in a third surface 30 of the second branch 5 facing away from the second bending axis 26 and is parallel to the second extension axis 6. The fourth straight line 29 extends in a fourth surface 31 of the third branch 24, which fourth surface 31 is the surface of the third branch 24 facing away from the second bending axis 26 and is parallel to the third straight extension line 27.
Finally, the person skilled in the art determines the distance a1 as the distance between the first free end 12 of the sheet metal workpiece 1 and the first intersection point S1, the distance a2 as the distance between the second free end 13 of the sheet metal workpiece 1 and the second intersection point S2, and the distance B1 between the intersection points S1 and S2. These distances are measured parallel to the first 3 and/or second 6 and/or third 27 straight extension lines. The distance a1 is parallel to the first extension line 4, the distance a2 is parallel to the third extension line 27, and the distance B1 is parallel to the second extension line 6.
The amount of tangential shortening defined by the present disclosure is calculated by one skilled in the art from T-L0-a 1-a 2-B1.
Fig. 4 shows the length and distance to be determined on a sheet metal workpiece 1, which sheet metal workpiece 1 has been bent around a bending axis 2 at a bending angle alpha to determine an edge shortening K; the edge shortening can be determined after the sheet metal workpiece has been bent about the bending axis 2 and at a bending angle of less than or equal to 90 °.
The person skilled in the art will be able to measure the original length L0 of the undeformed sheet metal piece 1, which is not shown in the figures, the original length L0 is the length that can be measured between the free ends 12, 13 of the undeformed sheet metal piece 1.
A sheet metal workpiece 1 to be bent about a bending axis 2 oriented perpendicularly to the drawing plane of fig. 4 comprises: a first branch 3 extending along a first straight extension line 4; a second branch 5 extending along a second straight extension 6; and an arcuate portion 7 extending between the limbs 3, 5. The straight extension lines 4, 6 form tangents to the arcuate section 7.
The straight running lines 4, 6 contact the arc 7 at a first transition point 14 and/or a second transition point 15, which transition points 14, 15 are geometrically well defined, but are difficult to determine on the bent sheet metal workpiece 1.
The person skilled in the art determines a first tangent point 16, at which first tangent point 16 a straight line oriented perpendicularly with respect to the first straight extension 4 forms a first tangent 18 of the arc-shaped portion 7. Furthermore, a second tangent point 17 can be determined, at which second tangent point 17 a straight line oriented perpendicularly with respect to the second straight extension 6 forms a second tangent 19 of the arc-shaped portion 7. The tangent points 16, 17 are additionally marked with circles.
A first edge length C1 may be measured on the bent sheet metal workpiece, the first edge length C1 being defined as the distance between the first free end 12 and the first tangent point 16, which is parallel to the first straight extension line 4. In the same way, a second edge length C2 on the bent sheet metal workpiece 1 can be determined, which second edge length C2 can be measured as the distance measured parallel to the second straight extension line 6 between the second free end 13 and the second tangent point 17.
For example, the first edge length C1 can be measured in a very simple manner using a caliper. For this purpose, the inner edge of the outer measuring jaw for the outer dimension of the object is arranged against the first free end 12 and against the outer surface of the arc 7, and the edge of the lever of the caliper facing the outer measuring jaw is arranged against the first surface 10. By placing the edge of the rod of the caliper against the first surface, the first tangent point 16 is determined and a first edge length C1 is measured.
In the same way, the second edge length C2 is determined by placing the inner edge of the outer measuring jaw against the second free end 13 and against the outer surface of the arc 7 and placing the edge of the lever of the caliper facing the outer measuring jaw against the second surface 11.
Finally, the person skilled in the art is able to estimate the amount of shortening of the sheet metal workpiece 1 that results from bending the sheet metal workpiece 1 about the bending axis 2 at an angle alpha < 90 ° by calculating the amount of edge shortening, which can be calculated by the formula K L0-C1-C2.
Fig. 4 shows a specific case of a bending angle alpha of 90 °, similar to the above description of the drawings with respect to fig. 1 to 3, a person skilled in the art will be able to determine the intersection point S as the intersection point of the first straight line 8 and the second straight line 9, in which respect the construction operation described in full detail above will be applied, the intersection point S is additionally circled in fig. 4, the distances a1 and a2 are also determined similarly to the above description, and the person skilled in the art realizes that in the specific case of a bending angle alpha of 90 ° shown in fig. 4, the application of a 1-C1 and a 2-C2. also applies to the specific case of an angle alpha of 90 °, L0-C1-C2, K-T-L0-a 1-a 2.
Fig. 5 shows a further method for determining the edge lengths C1, C2 on a bent sheet metal workpiece 1 having a bending angle alpha of less than or equal to 90 °.
The measuring arrangement comprises a first measuring element 20 and a second measuring element 21 with a first measuring element surface 22 and/or a second measuring element surface 23, the measuring element surfaces 22, 23 being arranged at an angle of 90 ° with respect to each other, the second measuring element surface 23 having a known length L2.
The measuring elements 20, 21 may be parts of a bending machine.
The bent sheet metal workpiece 1 is arranged with its outer surface against the measuring surfaces 22, 23. To determine the first edge length C1, the first surface 10 contacts the second measuring element surface 23 and the outer surface of the arcuate portion 7 contacts the first measuring element surface 22.
Fig. 5 shows a sheet metal workpiece 1 with a bending angle alpha equal to 80 °. The first measuring element surface 22 contacts the outer surface of the arcuate portion 7 the first measuring element surface 22.
Since length L2 is known, one skilled in the art can determine first edge length c1 by determining overhang measurement L1-measurement L1 can be determined, for example, by means of a non-contact measurement method.
To determine the second edge length C2, the person skilled in the art sets the bent sheet metal workpiece 1 with the second surface 11 against the second measuring element surface 23 and the outer surface of the arc 7 against the first measuring element surface 22, so that the second edge length b is determined in turn by measuring the overhang measurement L1 the process of determining the second edge length C2 is not shown in fig. 5.
Fig. 6 shows a method for estimating the amount of shortening of a sheet metal workpiece 1 bent about two bending axes 2, 26, which includes a first bending angle alpha of less than or equal to 90 ° and a second bending angle of less than or equal to 90 °.
The sheet metal workpiece 1 comprises a first branch 3, a second branch 5 and a third branch 24, which branches 3, 5, 24 extend along straight extension lines 4, 6, 27. The first branch 3 and the second branch 5 are separated by a first arc-shaped portion 7. The second branch 5 and the third branch 24 are separated by a second arc-shaped portion 25.
To measure the first edge length C1, the person skilled in the art sets the edge of the rod of the caliper (not shown in fig. 6) against the first surface 10 of the first branch 3, which first surface 10 is the surface of the first branch 3 facing away from the first bending axis 2. The person skilled in the art further sets the inner edge of the outer measuring jaw against the first free end 12 and the inner side of the other outer measuring jaw against the first arc 7. By placing the lever against the first surface 10, the inner edge of the other outer measuring jaw contacts the first arc 7 at the first tangent point 16.
The determination of the second edge length C2 is performed in the same way, wherein the edge of the shaft of the caliper (not shown in fig. 6) is arranged to abut the second surface 11 of the third branch 24. The inner edge of the outer measuring jaw in turn contacts the second free end 13 of the sheet metal workpiece 1 and the second tangent point 17.
To determine the edge length D1, the edge of the rod of the caliper (not shown in fig. 6) is placed against the third surface 30 of the second branch 5 and the inner edge of the outer measuring jaw is placed against the first arc-shaped part 7 and the second arc-shaped part 25.
The person skilled in the art calculates the amount of edge shortening of the sheet metal workpiece 1 that occurs as a result of the sheet metal workpiece 1 being bent about the first bending axis 2 and about the second bending axis 26 by means of the formula K L0-C1-C2-D1.
In the description of fig. 6, the construction of the cutting lines etc. is not described in detail as in the above description of the figures, so that the ease with which the method according to the invention can be carried out is also indicated by the written description.
Fig. 7 shows, in addition to fig. 5, how the method according to the invention can be used to measure sheet metal workpieces 1 which are shortened by bending and are shown in an exemplary shape, so that the shortening can be estimated. As initially explained above in the description of fig. 5, the bent sheet metal workpiece 1 is arranged in the measuring device formed by the first measuring element 20 and the second measuring element 21, so that the sheet metal workpiece 1 contacts the measuring device and the free end 12 can be measured.
The amount of tangential shortening is determined for each sheet metal workpiece 1 shown in fig. 7.
With the aid of fig. 8, it is illustrated how the amount of shortening of the sheet metal workpiece 1 bent about the first bending axis 2 and about the second bending axis 26 is estimated by measuring the free end by applying the method according to the invention. The sheet metal workpiece 1 comprises a first branch 3 extending along a first straight extension line 4, a second branch 5 extending along a second straight extension line 6 and a third branch 24 extending along a third straight extension line 27. The sheet metal workpiece 1 comprises a first arc-shaped portion 7 extending between the first branch 3 and the second branch 5 and a second arc-shaped portion 25 extending between the second branch 5 and the third branch 24. The first arc-shaped portion 7 and the second arc-shaped portion 25 are produced by bending the sheet metal workpiece 1 about the first bending axis 2 and/or about the second bending axis 26 by a bending angle alpha. The bent sheet metal work piece 1 shown in fig. 8 therefore has two equal bending angles.
The first end 12 of the bent sheet metal workpiece 1 is set in a measuring device comprising a first measuring element surface 22 and a second measuring element surface 23 for measurement. For the sake of clarity, only the measuring element surfaces 22, 23 arranged at right angles to one another are shown in fig. 8.
The first end 12 of the sheet metal workpiece 1 contacts the second measuring element surface 23 and its first surface 10 contacts the first measuring element surface 22, whereby the sheet metal workpiece 1 is also oriented towards the measuring device.
The second end 13 of the sheet metal workpiece 1 is measured using a non-contact and/or contact measuring method according to the prior art, wherein in particular the distance a and the distance b from the first measuring element surface 22 and/or the second measuring element surface 23 are determined.
Thus, the distance a and distance b as well as the bending angle alpha and the sheet metal thickness s are known to the person skilled in the art.
Due to the geometry that can be read out from fig. 8 by the person skilled in the art, this applies:
c＝c′+h
a-g＝d+e
T＝L0-(c+d+e)
T＝L0-(c+a-g)
the exemplary embodiments show possible embodiment variants of the method according to the invention, and it should be noted in this respect that the invention is not limited to these embodiment variants which are specifically shown, but that various combinations of the individual embodiment variants are also possible, and the possibility of such a variation lies within the ability of a person skilled in the art on account of the teaching of the technical effect provided by the invention. The person skilled in the art does not have to make any inventive step for this purpose.
The scope of protection is determined by the claims. However, reference will be made to the description and drawings for interpreting the claims. Individual features or combinations of features of different exemplary embodiments shown and described may represent separate inventive solutions. The fundamental object of the independent inventive solution can be derived from the description.
All methods for determining the distance can also be supplemented or replaced according to the prior art and/or by applying known teachings.
Finally, in terms of form, it should be noted that elements are not drawn to scale and/or are exaggerated and/or reduced in size for ease of understanding the structure.
List of reference numerals
1 sheet metal workpiece
2 (first) bending axis
3 first branch
4 first straight extension line
5 second branch
6 second straight extension line
7 first arc part
8 first straight line
9 second straight line
10 first surface
11 second surface
12 first end portion
13 second end portion
14 first transition point
15 second transition point
16 first tangent point
17 second tangent point
18 first tangent line
19 second tangent line
20 first measuring element
21 second measuring element
22 first measuring element surface
23 second measuring element surface
24 third branch
25 second arc-shaped part
26 second bending axis
27 third axis of extension
28 third straight line
29 fourth straight line
30 third surface
31 fourth surface
S intersection point
AiDistance between two adjacent plates
BjDistance between two adjacent plates
CkDistance between two adjacent plates
DlDistance between two adjacent plates