Method for making grid or grid shape

FIELD: plastic working of metals, possibly manufacture of metallic grids or grid shapes.

SUBSTANCE: method comprises steps of forming in blank row of notches of the same length arranged in staggered fashion; further deformation of blank by tensioning it. Notches in rows are inclined relative to lengthwise symmetry axis of blank at remaining portions of solid metal. Blank is tensioned by applying to solid metal portions pair of forces directed vertically and simultaneously in said solid metal portions lengthwise grooves are formed. At forming grid solid metal portions are formed along edges of blank. At making grid shape, symmetrical groups of rows of notches are formed in pairs; solid metal portions are formed along edges of blank and between rows of notches. Lengthwise corrugations are formed at tensioning blank. Symmetry axes of corrugations and of lengthwise grooves are arranged along symmetry axis of each solid metal portion arranged between rows of notches.

EFFECT: enhanced efficiency of method.

5 cl, 13 dwg

 

The invention relates to the field of metal forming, in particular to methods of manufacturing rotary metal grid or mesh profiles from sheet steel (strip), and can be used at the enterprises of machine-building, metallurgical and construction industries.

A known method of manufacturing a metal mesh of the workpiece strip (EN, No. 2146179, 03.10.2000), including running across the width of parallel, equal in length and staggered intermittent cuts, billets and stretch to the desired shape of the grid cells, and intermittent incisions performed in the longitudinal direction in the block rotating knives offset by a half pitch in each of the next row across the estimated width of the workpiece with the formation of the estimated number of rows of strips between the cuts, alternating with areas of interrupts, billets carried out simultaneously with the execution of the intermittent incisions on each adjacent strip the length of each cut in a plane perpendicular to the plane of the workpiece, leaving the area of the interruption in the plane of the workpiece, all obtained by forming shaping extreme guide strips in one direction, and each of the adjacent - in opposite directions, stretching is gotowke to the desired shape of the grid cells is carried out in a transverse direction to its longitudinal axis hooks for forming the extreme strips.

There is also known a method of manufacturing expanded metal mesh sheet blanks, which consistently perform parallel to each other are equal in length, staggered slits, and then the workpiece is deformed, thus simultaneously form two series of slots located with an offset of one series relative to the other and parallel to each other in each row, and at the same time, bend and stretch jumper between the slits, then the next transition form two series of slots in each of which slots are performing in line with the slots of one of the previously formed rows between rows of leave jumpers and deform the strips between the slits similar to the first transition, then these transitions is repeated up to the formation of slits along the length of the workpiece, and the subsequent deformation of the workpiece produced by the relative movement of the slots lying on one straight line, the slots lying on the adjacent straight along the bridges between the slits in the direction perpendicular to the slits (SU, No. 617125, 30.07.1978).

Known methods of manufacturing metal mesh describe the manufacture of expanded metal mesh by cutting and simultaneous stretching in the horizontal plane of the series of cells arranged in a checkerboard pattern.

The problem is, solved by the invention is to increase productivity through the use of the proposed operations of the method and the proposed sequence of operations, which allows you to automate the process of manufacturing grid (mesh fabric, mesh profile).

The problem is solved due to the fact that in the manufacture of a mesh fabric sheet on the workpiece across the width, excluding the edges of the blanks, put one group of rows of slots, or even the number of groups of rows of slots, and the slot in each group of rows parallel to each other, equal in size and are staggered offset the value of the step. Notching is performed under an angle relative to the longitudinal axis of symmetry of the workpiece, the preferred angle is up to α=10°. The formation of grid cells to a predetermined shape and size is accomplished by the application of vertical forces (pair forces) to the edges of the workpiece, on which punching is not applied (sections solid metal)by the paired fixing rollers of the roll forming stands of the mill. Paired fixing rollers of the first stand roll forming mill, between which is located the edge of the workpiece, move: one vertically upwards, the other with the second edge of the workpiece is vertically downwards, ensuring the application of vertical efforts of stretch marks. At the same time in% the SSE meshing in forming mill form flanging grid in the form of longitudinal grooves, which in the finished product are the elements of the gearing between adjacent products in the manufacture of plaster works.

The task in the manufacture of mesh profile significant widths is due to the fact that the sheet workpiece is applied to its width, excluding the edges of the workpiece, an even number of groups of rows of slots (form on the workpiece from two to four, six, etc. groups of rows), and notching one group of rows is applied with an orientation towards the slots of the other row, i.e. ±α ("tree"). Punching in the ranks of one group parallel to each other, equal in length and are staggered offset the value of the step. Each pair of groups of rows of slots alternate with areas of solid metal (with a continuous strip of metal), which form a longitudinal trough (ribs).

In other words, the workpiece is a band formed by a series of slots arranged at an angle to +10°and a series of slots arranged at an angle to (-10°), meaning "tree". These bands may be one (for the grid) or more (net fabrics). If these two bands or more, between them is a stretch (band) solid metal (no slots). The axis of symmetry plots (bars) solid metal will continue to be the axis of symmetry of prodelin the x gutters along the edges of the workpiece, and gutters in the middle of the workpiece and the corrugations of the workpiece (for net profile).

The formation of the cells of a mesh fabric and mesh profile is carried out with simultaneous formation of the edges of the workpiece in the stands of the roll forming mill to obtain a continuous longitudinal edge of the gutter.

If there are multiple groups of rows of slots arranged in a herringbone, and, respectively, in the presence of strips of solid metal workpiece between a pair of series groups, the formation of cells occurs with the simultaneous formation of longitudinal grooves along the symmetry axis of the above-mentioned continuous strips of metal.

As the line of application of the vertical efforts use a gutter formed from a continuous region of the workpiece, and (only for profile gutter formed along the axis of symmetry of strips of solid metal billet between the paired groups of rows. Application to extreme chutes (for the web) or to extreme gutters and neighboring areas of solid metal (profile) efforts directed vertically upwards and vertically downwards (pair forces), resulting in the stretching of the workpiece. In the case of manufacturing the mesh profile due to the application of a pair of forces to areas (bands) solid metal, located in the middle of the workpiece, the latter are formed with longitudinal corrugations.

When moving a piece on the stands in case the application is of rosenhek "Christmas tree" (pairwise symmetric rows) form one (if there is one pair of rows of slots) or more (if there are two or more pairs of rows of slots) of the corrugations estimated height, and at the same time the workpiece is stretched with the formation of grid cells of a given size.

Complete the manufacture of the mesh profile operation rolling of corrugations (flattening the corrugated surface of the workpiece to almost flat) and get products specified width. This product remain the longitudinal trough along the entire mesh surface (function of the ribs net profile), and the extreme longitudinal gutter.

To obtain the net profile of different shape, in addition to the described use tools mill roll forming mill to give a horizontal mesh profile of different shape (angular, and so on).

The technical result from the use of the invention is that the proposed method allows to:

to reduce the complexity of manufacturing by reducing the number of technological operations (no stamps, hydraulic);

to ensure full automation of production through the proposed sequence of operations and high performance.

Characteristics of the manufactured products. Mesh and mesh profile are made from a thin sheet of galvanized steel low carbon steel GOST 14918-80 with a minimum thickness of 0.4 mm

Both edges of the grid or mesh profile molded in the form of longitudinal and lead the s, used when the application is ready mesh profile in plastering work for the reconciliation of the beginning of the subsequent blade with the end edge of the previous one. The cross-section of the gutter is made, for example, in the form of an isosceles triangle with sides m=7.9 mm with an angle at the top ϕ=60° and r=0,5 mm

Net profile differs from grid large width and the presence of one or more longitudinal grooves of solid metal that share net sites with calculation step. Gutters along the edges of the mesh profile, and the gutter between the mesh plots have the same shape.

An example of the finished product (mesh). Ready mesh has a ribbed surface with cells in the form of a parallelogram with an angle of 60° and parties of 11 mm and 7 mm, in pairs symmetrical rows of parallelograms are staggered offset the value of the step angle up to 10° to the longitudinal axis of symmetry of the workpiece toward each other ("tree").

The invention is illustrated by drawings, which depict:

figure 1 - scheme of the rotational grid production and net profile;

figure 2 is a view As in figure 1;

figure 3 - application to bandpass preparation of slots for grid production;

figure 4 - diagram drawing for strip harvesting of slots for the manufacture of the mesh is of ROFILE;

figure 5 - scheme of fixing the edges of the workpiece in a first stand;

figure 6 is a fragment of the moulded edge of the workpiece;

figure 7 - diagram of stretch mesh rollers of the roll forming mill;

on Fig - a fragment of the mesh;

figure 9 - diagram of the early formation of trenches (ribs) on the example of forming one corrugation;

figure 10 - diagram of the complete formation of one corrugation;

figure 11 - diagram of the formation of "n" bumps when moving a piece on the mill roll forming mill;

on Fig - General view of the mesh profile;

On Fig - section a-a in Fig.

The method of manufacture of the product is as follows.

Sheet blank 1 supplied from the uncoiler 2 on a rotating installation 3, in which the workpiece rollers are applied with perforation 14. For the manufacture of nets, for example, the width L≤500 mm, perforation, put on the scheme shown in figure 3: on the workpiece over the entire width, except for solid edge 15 of a width of d=20 mm (for this example) put one group of rows or an even number of groups of rows parallel to each other and equal to the length of slots 14, staggered offset the value of the step. Punching in each group of rows of angled no more than 10° in relation to the longitudinal axis of symmetry of the workpiece. If groups of rows of two or more (four, six, etc.) slot in the neighboring row is x Orient towards each other ("tree") at angles up to ± 10°.

For this particular example, the distance in the range a=3 mm, the length of the perforation, b=18 mm, distance between rows with a=1.5 mm

The dimensions of slots, pick experimentally for each required size of the grid cell.

For the manufacture of mesh profile sheet on the workpiece, eliminating edge 15 of a width of, for example, d=20 mm, similar to the scheme in figure 3 is applied with perforation, according to the scheme in figure 4, with each pair of groups of rows of slots 14 alternates with a solid strip of metal 16 width (d=20 mm (for this example).

From installation, which produces cutting, the workpiece is passed into the roll forming mill 4. In the camp 4 working tool stands in the form of roll forming rollers sequentially generates the grid cell or reticulated profile in the process of moving the workpiece from the cage into the cage. The formation of the grid and gutters perform under the influence of effort vertically upwards or downwards through the paired fixing rollers of the rolling mill 4, between which have areas of solid metal, that is, edge 15, or a continuous strip between the pairs of groups of rows of slots (figure 5, 6, 7, 9, 10).

In the manufacture of mesh billet with rents fixed in the first stand and stretch to the desired size in the second cage, and then on the cutting installation 5 cut the estimated length of the grid with the required RA the measures of the cells in the form of parallelograms (Fig) l=11 mm, k=7 mm, β=60°.

In the manufacture of mesh profile of the workpiece from the unit 3 for applying the rents are passed into the first cage 6 roll forming mill, in which the edges 15 are fixed a pair of rollers 16, and then the workpiece is moved in the following cages (second crate 7, 8 third, fourth, 9, 10 fifth) of the forming mill. Figure 9, 10 in the example of forming the corrugations 18 of the plot is solid metal (solid bars) 16 schematically illustrates the stretching of the workpiece under the influence of a pair of forces F acting through a pair of rollers 19, moving vertically downwards.

Complete the formation of the corrugations 18 in the fifth cage (POS. 10) under the influence of a pair of forces F through fixing rollers 22, resulting in the width of the mesh sections 20 reaches a width of 21 when the flute height from H1to the calculated value of H4(figures 9, 11).

After the formation of corrugations given the calculated value of the workpiece mesh profile move in the next cage 11 and 12 of the forming mill. In these stands are rolling flute - flattening the workpiece so that the corrugations oposals, and along the symmetry axis plots the solid metal (i.e. the symmetry axis of the corrugations) was formed in the process of stretching the trench (as shown in Fig and 13).

Ready net profile cut on the installation of the segments 5.

In the manufacture of mesh profile is acceptable cross-section in bending mill additionally include stand with the working tool for the manufacture of the desired profile.

1. A method of manufacturing a grid or mesh profile of sheet blanks, comprising performing in the procurement of rows of slots, equal in length and arranged in a checkerboard pattern, and the implementation of subsequent deformation of the workpiece by stretching, characterized in that the perforation in the ranks of perform at an angle to the longitudinal axis of symmetry of the workpiece with the formation of solid areas of metal, the tensile strength of the workpiece is performed by the application of a pair of forces to areas of solid metal, directed vertically, with the simultaneous formation of longitudinal grooves on the areas of solid metal.

2. The method according to claim 1. characterized in that in the manufacture of mesh perforation in the ranks of perform at an angle of up to 10° to the longitudinal axis of symmetry of the workpiece with the formation of solid areas of metal on the edges of the workpiece and forming at them while stretching the preform longitudinal grooves.

3. The method according to claim 1, characterized in that in the manufacture of mesh profile in the workpiece perform pairwise symmetric group of rows of slots, with the formation of solid areas of metal on the edges and between the rows, notching in paired rows perform directed towards each other, when the stretching of the workpiece to each plot the solid metal located between the rows, a pair of forces applied along its axis of symmetry with the formation of the and the workpiece longitudinal corrugations, in this case the axis of symmetry of the mentioned ribs and longitudinal grooves have on the symmetry axis of each plot is solid metal.

4. The method according to claim 3, characterized in that the perforation in paired rows perform at an angle to ±10° to the longitudinal axis of symmetry of the workpiece.

5. The method according to claim 3 or 4, characterized in that in the manufacture of mesh profile, after stretching of the workpiece and education therein longitudinal grooves and corrugations produce rolling corrugated blanks.



 

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