SHEET METAL SECTION FOR CABLE TRAY, CABLE TRAY INCORPORATING SUCH A SECTION, AND METHOD FOR MANUFACTURED BY SUCH A SECTION
Patent Information
- Application Number
- FR2017056788
- Authority / Receiving Office
- FR · FR
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2017-07-18
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2037-07-18
AI Technical Summary
Existing cable trays made from thick sheet metal plates to ensure mechanical strength and prevent deformation under load result in increased material cost and weight, making transportation and installation cumbersome.
A sheet metal section for cable trays with embossed stamping reliefs on the bottom and/or side walls, increasing rigidity without significantly increasing material cost or weight, achieved by stamping patterns forming ribs in non-parallel directions and maintaining a low thickness.
The embossed design enhances mechanical performance, particularly bending resistance, while maintaining cost-effectiveness and reducing weight, thus improving installation and transportation efficiency.
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Abstract
Description
Sheet metal section for cable trays, cable trays incorporating such a trongon and manufacturing process of such a trongcon The invention – a feature with a sheet metal stub for cable routing. The invention also relates to a cable tray comprising such a stub, as well as to a process of manufacturing such a trongon. A cable tray typically consists of several sections placed end to end. and supported by brackets or hangers. These spars can be made by bending of sides or sheet metal plates or by welded wire mesh, the most often metallic. The present invention applies to the case where the cable tray sections are made from sheet metal sides or plates. In such a case, it is important to give to each section of the cable tray has sufficient mechanical resistance to support efficiently support the cables arranged there, without deforming. In particular, inertia in The twisting of a cable tray segment must be sufficient so that this segment does not does not deform under load. In conventional cable trays, these constraints on the properties The mechanical requirements of a truncated end are met by using sheet metal plates of a certain thickness. relatively large, specifically greater than or equal to 0.6 mm. This approach increases the material cost of a cable tray segment and makes the segment heavier, which is detrimental both to its transport and installation on site and to the sizing of support brackets or hangers. It is these drawbacks that the invention in particular aims to remedy. offering a new sheet metal stub for cable trays whose properties The mechanics are satisfactory, without its material and weight being indefinitely increased. To this end, the invention relates to a cable tray stub, this stub comprising a base and two side walls made from a sheet of metal, characterized in this case the sheet metal plate is an embossed plate with embossed reliefs arranged on the bottom and / or moon at least of the side walls. Thanks to the invention, the embossed reliefs made on the sheet metal, which allow changing it from a flat configuration to a waffle-like configuration has the effect to increase the rigidity of the sheet metal at the bottom and / or side walls. This allows to increase the load-bearing performance of the stump, without increasing neither its cost price nor its weight. According to advantageous but not mandatory aspects of the invention, such a trongon may incorporate one or more of the following features, taken according to any technically permissible combination The base and both side walls each feature raised reliefs. stamping. The embossed sheet metal has a base thickness and this sheet metal is stamped on a height greater than 50%, preferably greater than 75%, preferably even greater than or equal to 100% of the base thickness. The embossed sheet metal is stamped with a pattern forming ribs extending along at least two non-parallel directions. The veins intersect and delimit between them non-gautrate areas of the sheet metal. The ribs define between each other lozenges of un-embossed sheet metal, one of which one of the major axes is parallel to a longitudinal axis of the trunk. —The sheet metal plate is provided with perforations arranged in at least some non-embossed areas delimited between the ribs, without intersection with the ribs. According to another aspect, the invention relates to a cable tray formed by the succession of sheet metal stubs, at least one of which is as mentioned above. Such a cable tray offers improved mechanical performance, without neither a significant increase in its cost price nor in its linguistic weight. Finally, the invention relates to a method for manufacturing a sheet metal stub for cable tray as mentioned above, which method includes at least successive stages consisting of a) supply a flat sheet of metal of a given thickness, b) emboss the sheet metal to obtain a textured plate of thickness apparent upper edge of the sheet metal supplied a) and c) Fold the embossed plate to define the base and the two side walls of the trongon. Advantageously, step c) is carried out in a profiling machine which is adjusted according to the apparent thickness of the embossed plate, so as not to do not crush the stamped structure obtained in step b). The invention will be better understood and other advantages of it will become more apparent. clearly in light of the description that will follow of a method of implementation of a sheet metal trongon, a cable tray and a manufacturing process conforming to its This principle is given solely as an example and with reference to the attached drawings. in which Figure 1 is a perspective view of a section of cable tray conforming to the invention; Figure 2 is a perspective view of a supplied flat sheet metal plate to make the stub in figure 1; Figure 3 is a perspective view of the sheet metal plate at the end of a stamping operation implemented during the manufacturing process of the stump Figure 1; Figure 4 is a larger scale cross-section along line IV-IV in Figure 3; Figure 5 is a top view of the stump shown in Figure 1 and Figure 6 is a section along line VI—VI in Figure 5, at the same scale as Figure 4. The truncated piece 2 shown in figures 1, 5 and 6 is intended to be assembled with similar stubs to form a cable tray capable of supporting, in height, cables not shown. This stub is intended to be supported by one or several consoles or brackets, also not shown. This stump extends along a longitudinal axis X2 and comprises a base 4 and two side walls 6 and 8. Let Y2 be a transverse axis of the truncated disc 2. The base 4 is generally parallel. to the X2—Y2 plane. Z2 is an axis perpendicular to the X2 and Y2 axes. The lateral walls 6 and 8 extend on either side of bottom 4, on the same side of plane X2—Y2, along axis Z2. The lateral walls 6 and 8 are partially parallel to the plane X2—Z2. The length L2 of segment 2, which is measured parallel to axis X2, is variable. Indeed, the spar 2 can be produced with several lengths L2 and these The lengths themselves can be adapted, on the site of the trongon installation, by a cut of it along a direction parallel to the Y2 axis. In the figures, for the For clarity of the drawing, the length L2 is represented with a minimum value in figure 1. Even though this length can be greater, what does the interruption represent? localized in Figure 5. Figures 2 and 3 correspond to an intermediate value of the length L2. The stump 2 includes perforations 10 which are distributed in the bottom 4 and in the side walls 6 and 8. In the example, these perforations are oblong, with their largest dimension parallel to the X2 axis. This is not mandatory, however, and Other geometries for the 10 perforations are possible. Similarly, other The distribution of the 10 perforations between the bottom 4 and the side walls 6 and 8 is conceivable. We note {2 the width of the trunnion 2 measured parallel to the Y2 axis. The trongon 2 is made from a flat plate or sheet metal side 20 of which the Length L20 and width £20 are selected based on dimensions L2 and 12 a obtain for the trongon 2 at the end of its profiling. We note X20 a longitudinal axis of the plate 20, Y20 a transverse axis of the plate 20 which is parallel to its plane and 220 an axis perpendicular to the axes X20 and Y20, therefore perpendicular to the principal plane of plate 20. When plate 20 is formatted to form segment 2, the X20, Y20 and 220 axes are respectively coincide with the X2, Y2, and Z2 axes. The dimensions L20 and 120 are respectively measured along the X20 and Y20 axes. The sheet metal plate 20 is supplied already equipped with the perforations 10 gui are arranged in columns parallel to the X20 axis and in rows parallel to the axis Y20, which — has the effect that, in the truncated end 2, the perforations 10 are aligned on columns and rows respectively parallel to X2 and Y2, as visible in figures 1 and 5. We note e20 F as the thickness of the sheet metal plate 20 which is measured parallel to axis 220, that is to say, perpendicular to its length L20 and its width £20. This thickness e20 is chosen with a relatively low value, between 0.5 and 2 mm, preferably around 0.55 mm. Given the thickness value e20, the material cost of plate 20 is relatively low and the surface weight of This plate is relatively weak. According to the invention, the plate 20 undergoes, during the manufacturing process from the trongon 2, a stamping step which — has the effect of transforming the plate 20 which is flat in its configuration shown in Figure 2 as a 20° embossed plate represented in figure 3. More specifically, in the configuration of Figure 3, the 20° embossed plate is equipped with two sets of ribs 21 and 22 which are produced by localized stamping of plate 20, which form a stamped structure on plate 20' and which delimit between them are 23 non-gauffed zones, that is to say, flat. The ribs 21 are straight and parallel to an axis A21, itself parallel to the plane X20—Y20 and sequent to the x20 and Y20 axes. The ribs 22 are straight and parallel to an axis A22, itself parallel to the X20-Y20 plane and sequent to the X20 and axes Y20. Axes A21 and A22 are not parallel to each other, therefore sequential. Ribs 21 and 22 are regularly distributed over the surface of the plate Gautrea 20° Given the arrangement of ribs 21 and 22, zones 23 have a shape of a rhombus. We denote A23 and B23 respectively as the major axes of a zone 23, that is—a— State the axes of symmetry of this area. In Fexample, Faxis A23, which is the longest of the two, is parallel to the X20 axis and therefore to the X2 axis in segment 2, while the B23 axis is parallel to the Y20 axis, therefore to the Y2 axis in segment 2. The inverse is also possible, in particular by ensuring that the largest dimension of the openings 10 is parallel to the longest of the major axes of zones 23. Let h be the stamping height of plate 20. $223 is a portion of the lower surface of the plate at 20° located at level of zone 23, this lower surface being the one that is not visible in the figures 2 and 3. Similarly, we denote S221 and $222 the portions of the lower surface located at the bottom of ribs 21 and 22. At the intersections of ribs 21 and 22, the surface portions $221 and $222 are common, as can be seen in figure 4. The stamping height h is equal to the difference in position along the axis 220, between surface $223, on the one hand and one of surfaces $221 and S222, on the other hand. In this example, the stamping height h is the same at the ribs. 21 and 22. This is not mandatory, however, but preferable in terms of manufacturing. In Indeed, when the height of the ribs is not identical, it is more difficult to profile because The machine opening must then be managed according to the respective heights of the veins, this mistletoe is complex because the two veins preferentially pass between same pebbles associated with the same opening. Thanks to the ribs 21 and 22 obtained by localized stamping of the plate 20, the total inertia of the plate at 20° in the configuration of Figure 3 is approximately increased relative to its inertia in the configuration of Figure 2, without increasing the quantity of material used in relation to the configuration in Figure 2. We note e©20 as the apparent thickness of the embossed plate 20' in the configuration figures 3 and 4, that is to say the maximum distance, along the Z20 axis, between the surfaces lower and upper parts of this plate. — relation e20 e20 +h Equation 1 In other words, the apparent thickness e©20 of the 20° embossed plate is equal a the sum of the given thickness e20 of the plate 20 as supplied and of the stamping height h. The drawing height h is chosen to be greater than 50% of the given thickness e20, preferably greater than 75% of this height. Particularly good results Satisfactory results were obtained with a drawing height h equal to the thickness data e20 of plate 20 in the configuration of figure 2. Given the creation of ribs 21 and 22 of the stamped structure on the plate 20° the resistance a the bending of the truncated section 2 shown in Figure 1 is increased by 20% compared to the same trongon made from a non-embossed plate of thickness e20. It is possible to consider a stamping height h greater than the thickness data e20, in order to achieve an even improved flexural strength, provided that The stamping operation does not induce localized tearing of plate 20 and that it It is still possible to profile without damaging the ribs. The fact that directions A21 and A22 are not parallel implies that, regardless of the position of the trunnion cut 2 along the X2 axis, 'increasing resistance a. The bending is effective up to the two transverse edges 5 and 7 of the stub 2. In In other words, there is no breaking of inertia, whereas this could occur if the ribs were parallel to the Y2 axis. The 10 perforations are distributed in some of the diamond-shaped areas 23, but not all. The respective dimensions of these perforations 10 and these zones 23 are chosen so that the perforations do not intersect ribs 21 and 22. Thus, The 10 perforations do not have the effect of reducing the increase in resistance to the bending achieved thanks to ribs 21 and 22. During the manufacturing of the trongon 2, once the 20' plate is configured as shown in Figure 3, following its stamping, this plate is loaded onto a GUI profiling machine — for the function of progressively bending the 20' plate in order to delimit the side walls 6 and 8 relative to the bottom 4, as well as two ribs 12 and 14 which extend parallel to axis X2, along the sides of the bottom 4, and the folded edges 62 and 82 side walls 6 and 8, according to a technique known in itself. During the 20° plate bending or profiling stage, the profiling machine is set to the apparent thickness side e©20. In other words, the spacing between the pebbles of the The profiling machine is adjusted according to this thickness e©20, so as not to crush the Embossed structure formed by the intersecting network of ribs 21 and 22. This allows to ensure that the improvement in the mechanical properties of the plate obtained through The stamping operation is indeed found in the stump 2, once this one— profiled. The stamping height h is the same in the 20' plate and in the bottom 4 of the trongon 2, as can be seen from the comparison of figures 4 and 6. In Figure 6, the thickness e2 corresponds to the thickness of profile 2 in its parts planes, namely zones 23 and the apexes of ribs 21 and 22, while the thickness e°'2 is the apparent thickness of the stump 2, defined as before for the plate Gautrea. In practice, the values of the thicknesses e2 and e20 are equal, as are the thickness values e'2 and e©20. In other words, profiling does not change the thickness of the embossed plate 20° In the example shown in the figures, ribs 21 and 22 extend simultaneously into the bottom 4 and in the lateral walls 6 and 8 of the truncated section 2. Alternatively, these ribs may not to extend only in one of its parts of the trongon 2, namely only in the bottom 4 or only in one or the other of the side walls 6 and 8. Alternatively, the 10 perforations can be made in the plate 20° after the stamping of ribs 21 and 22. The embodiments and variants envisaged above can be combined between them to generate new ways of implementing the invention.
Claims
8 DEMANDS 1,- Section (2) for cable tray, this section comprising a base (4) and two side walls (6,8) made from a sheet metal plate, characterized in that the sheet metal plate is an embossed plate (20') provided with ribs made by stamping (21,22), arranged on the base (4) and / or at least one of the side walls (6,8), which extend in at least two non-parallel directions (A21, A22), which intersect and which delimit between them non-embossed areas (23) of the sheet metal (20). 2,- Sheet metal section for cable tray according to claim 1, characterized in that the bottom (4) and the two side walls (2) each have stamping reliefs (21,22). 3,- Sheet metal section for cable tray according to one of the preceding claims, characterized in that the embossed sheet metal (20') has a basic thickness (e20) and in that this sheet metal is stamped over a height (h) greater than 50%, preferably greater than 75%, preferably even greater than or equal to 100% of the basic thickness. 4.- Section of sheet metal cable tray according to one of the preceding claims, characterized in that the ribs (21, 22) are regularly distributed on the embossed plate (20). 5.- Cable tray sheet metal section according to one of the preceding claims, characterized in that, at the level of the intersections of the ribs (21, 22), portions (S221, S222) of a lower surface of the bottom (4) of the section (2) which are located at the level of the bottom of these ribs, are common to these ribs. 6,- Section of sheet metal cable tray according to one of the preceding claims, characterized in that the ribs (21,22) delimit between themselves lozenges (23) of non-embossed sheet metal, one of whose major axes (A23, B23) is parallel to a longitudinal axis of the section (X2).
7. Section of sheet metal cable tray according to claim 5 or 6, characterized in that the sheet metal plate (20') is provided with perforations (10) arranged 9 in at least some of the non-embossed areas (23) delimited between the ribs (21,22), without intersection with the ribs. 8.- Cable tray formed by the succession of sheet metal sections, characterized in that at least one of these sections (2) is according to one of the preceding claims.
9. A method for manufacturing a sheet metal section (2) for cable trays comprising a base (4) and two side walls (6, 8), this method being characterized in that it comprises at least successive steps consisting of: a) supply a flat sheet metal plate (20) of a given thickness (e20), b) stamping the sheet metal plate to obtain an embossed plate (20') include ribs (21, 22) which extend in at least two non-parallel directions (A21, A22), which intersect and which delimit between them non-embossed areas (23) of the sheet metal (20), the embossed sheet metal having an apparent thickness (e'20) greater than the given thickness of the sheet metal plate supplied in step a) and c) bending the embossed plate to define the bottom (4) and the two side walls (6,8) of the section (2). 10.- Method according to claim 9, characterized in that step c) is carried out in a profiling machine whose gap is adjusted according to the apparent thickness (e'20) of the embossed plate (20') so as not to crush the stamped structure obtained in step b).