EP1537923A1 - Method of producing expanded metal elements - Google Patents

Abstract

The metal mesh elements are fabricated from plates or bands, which are fabricated by offset cuts, without loss of material and simultaneous stretch forming, to create a mesh structure. Advance of the bands or plates is varied to vary the width of the webs. Each row of mesh is given its own form stability by varying the advance. The element has part surfaces, each of which is defined by contacting mesh rows and each has its own form stability.

Description

The invention relates to a method for producing expanded metal elements

An expanded metal mesh is a material with openings in the surface. They result from staggered cuts without loss of material and stretching at the same time. The stitches of the material made from panels or ribbons are neither braided nor welded.
The type of stretched mesh is defined by the following key features: mesh length, mesh width, mesh size, web width, web thickness, node, knot length, knot width and web grid thickness.
State of the art is the production of an expanded metal mesh element according to fixed dimensions. That is, per element remain the above-mentioned features always constant, no matter the diamond shape or the constant web width pattern of the mesh, apart from usual tolerances in metalworking.

Through the formation of different web widths or change of However, web width pattern within a grid element can be the same permanent web thickness (determined by the sheet thickness) the dimensional stability or Breakthrough time to be adapted to the purpose.

In prisons fences or masonry crowns and roof edge fences are built with expanded metal skins, which must meet the following requirements. In the standing area of a person (up to 2.0 - 3.0 m top edge of terrain), the expanded metal planking should have a high resistance to the action of force and be very dimensionally stable in order to minimize penetration by tools or by use of force.
In contrast, in the fence area (about 3.0 - 5.0 m) instability of the expanded metal element (flexible) is desired in order to hinder overcoming by a person. In addition, distortion factors resulting from the connection of several components should be reduced.

So far, these properties have only been differentiated by the combination stable elements by joining, e.g. by welding, achieved.

The invention has for its object to provide a way that eliminates the disadvantages of the prior art.
According to the invention, the object is achieved in a method for producing expanded metal elements in that the advance of the material from which the expanded metal mesh is produced is varied in accordance with the static properties of the finished expanded metal mesh.
The advantage of the invention consists in the much better visual appearance, the saving of fasteners and distortion factors, the increase in performance characteristics variable according to the requirements of the user, a lower consumption of the starting material and a significant saving of assembly time and the saving of material costs.

Fig.1

eine schematische Darstellung der Abfolge zur Herstellung eines Streckgitters

Fig. 2

einen Ausschnitt eines Streckgitters

Fig. 3

einen Ausschnitt eines Streckgitters

Fig. 4

einen Ausschnitt eines Streckgitters

Fig. 5

einen Ausschnitt eines gewalzten Streckgitters

Fig. 6

ein noch nicht fertig hergestelltes Streckgitter

Fig. 7

ein erfindungsgemäßes Streckgitter

The invention will be explained in more detail with reference to drawings. In the drawings:

Fig.1

a schematic representation of the sequence for producing a stretched grid

Fig. 2

a section of a stretched grid

Fig. 3

a section of a stretched grid

Fig. 4

a section of a stretched grid

Fig. 5

a section of a rolled expanded grid

Fig. 6

a not yet produced expanded metal mesh

Fig. 7

an inventive expanded metal mesh

According to Fig. 1, the sequence of producing a stretched grid 1 of a Metal sheet 2 shown. In the first image sequence, the metal sheet to be processed is 2, with a projection which is equal to the web width 5 to be achieved, see FIG. 2, inserted and the schematically illustrated punch 3, the cutting and the Stretching moves, indicated by the arrow marked down. In the second image sequence, the punch 3 is moved upward. In the third sequence is already to recognize the first stretching pattern of the expanded mesh 1 to be created. Of the Stamp 3 is defined horizontally, here to the right, by a half stitch length 4 (defined as shown in FIG. 3). At the same time the metal sheet 2 is again around the web width. 5 advanced. According to the fourth image sequence, the stamp 3 is again down guided and then, as seen from the fifth sequence, back up. It The first stitches were made. According to the sixth image sequence is the Stamp 3 again horizontally, but this time in the opposite direction to the half stitch length led to its starting position. The metal sheet 2 becomes advanced simultaneously around the web width 5. Now is a complete cycle to make the stitches and another can follow. The Shape of the punch 3 specifies the mesh width 6 according to FIG. 3. By change the stamp form are stitches, as shown in Fig. 4, can be produced. In Fig. 5 a section of a stretched grid 1 is shown, which after production was still rolled flat. Fig. 6 clearly shows the two still connected Parts, namely the metal sheet 2 and the expanded metal grid 1. The web thickness 7, as shown in FIG. 2, is defined by the thickness of the metal sheet 2. A change in the stability of the Expanded mesh 1 is thus given by two options, either one varies Thickness of the metal sheet used 2 or you change the feed of the metal sheet 2 and thus varies the web width 5. In Fig. 7 is an inventive expanded metal mesh 1 shown. The lower three courses show a wider web width 5 as the top three courses. This was achieved by using the first three production cycles described above with a constant feed worked, which was then shortened and thus the next three Mesh rows were then produced with the then constant feed.

LIST OF REFERENCE NUMBERS

1

expanded metal

2

metal sheet

3

stamp

4

mesh length

5

web width

6

mesh width

7

web thickness

Claims (3)

Process for the production of a lattice element from sheets or Bands caused by staggered cuts without loss of material and at the same time stretching deformation so that a mesh structure is created to be made, wherein the feed for the panels or bands to vary the web width at the production of the expanded metal mesh element is changed. Expanded mesh element produced according to claim 1, characterized in that each row of stitches by varying the feed has its own dimensional stability. The expanded metal element according to claim 2, characterized in that the expanded metal element has partial surfaces, wherein each partial surface is determined by adjacent mesh rows and each partial surface has its own dimensional stability.

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