RU2240194C1 - Method for making angular latticed shape - Google Patents

Abstract

FIELD: plastic working of metals, namely manufacture of angular latticed-structure shapes.

SUBSTANCE: method comprises steps of moving blank to multi-stand shape-bending mill for perforating blank and forming shape; preliminarily forming along length of blank and along its symmetry axis lengthwise groove; perforating blank for making rhomb-like net due to making in blank surface rows of lengthwise slits of the same length arranged in adjacent rows in such a way that they are mutually shifted by half of their length; then successively stretching-out blank from its boundary slits to slits arranged nearer to symmetry axis of blank; forming shape in the form of angle between latticed ledges of shape due to their successive bending one towards other while using blank in the form of band whose width is equal to length of non-stretched ledge; in order to make rhomb-like net stretching-out by pairs two boundary (symmetrical relative to lengthwise axis) rows of slits until providing designed width of rhomb; after forming angle leveling outer surface of ledges of shape in additional working stand.

EFFECT: enhanced efficiency of method due to performing wholly automatic process.

4 cl, 18 dwg

Description

The invention relates to the field of metal forming, and in particular to methods for manufacturing perforated profiles for use mainly in the construction industry of internal, external, thermal insulation and puttying. The method can also be used in various industries, engineering, electrical engineering, agriculture, etc. for the manufacture of corner profiles of mesh construction.

A known method of manufacturing a grid according to the author's certificate of the USSR No. 617125, class. In 21 D 35/00. The mesh is made by the expanded method, in accordance with which, parallel to each other, equal in length and located with an offset of one relative to the other slots, they are arranged in a stamp in a stamp, and then the workpiece is deformed between the rolls with teeth to obtain a mesh.

This method is inefficient, since the output of products depends on the technical capabilities of the stamp.

The known method according to the patent of the Russian Federation No. 2078638, class. B 21 D 47/02. The method is intended for the manufacture of expanded metal mesh from strip material, in which, perpendicularly to the feed axis of the workpiece, the cells are cut-out and then a pair of rollers, with protrusions on one and hollows on the other, are stretched and molded.

This method also has a very low productivity, difficult to set up the cutting pair. Cutting the workpiece in the transverse direction to the rolling direction of the material reduces the mechanical strength of the mesh.

A known method of manufacturing a expanded metal mesh product according to the patent of the Russian Federation No. 2146179, class. B 21 D 47/02. The method consists in the fact that over the entire estimated width of the workpiece strip simultaneously form the estimated number of rows of strips, which are simultaneously intermittently in the longitudinal direction of the notch with an offset of half the pitch of the notch, at the same time, the notches are formed, giving the workpiece an expanded shape. Then the workpiece is stretched to a predetermined mesh size and a given cell shape.

The disadvantage of an analogue is:

- low productivity of manufacturing mesh products of a single production with calculated parameters of the length and width of each product;

- the inability to automate the manufacturing process.

The closest analogue of the invention is a method of manufacturing an angular profile from a workpiece in the form of a strip or tape, comprising moving the workpiece into a multi-stand roll forming mill, in which they form a perforation of the workpiece and form a profile (see I. Trishevsky and others. Perforated profiles. M .: Metallurgy . 1972, p. 89-92).

The disadvantage of this method is the lack of productivity of the method.

The problem solved by the invention is to increase the productivity of an automatic method for manufacturing a corner mesh profile from a metal strip with a given cross-section and the estimated length for plastering and puttying of construction production, as well as reducing waste in the production of the profile.

The problem is solved due to the fact that the angular mesh profile is obtained in the automatic mode by cold rolling a metal strip on a multi-strand roll forming mill with cutting the tape and drawing out the slots in the working stands of the roll forming mill to form a perforation in the form of a diamond-shaped mesh.

The method includes moving the workpiece into a multi-stand roll forming mill in which the workpiece is perforated and a profile is formed, first of all, forming a longitudinal groove located along the workpiece length along its axis of symmetry, then forming the workpiece perforation in the form of a diamond-shaped mesh by applying to the surface blanks of rows of longitudinal slots, equal in length and located in adjacent rows with offset relative to each other by half the entire length, and carry out sequential drawing from the extreme x slots to slots located closer to the axis of symmetry of the workpiece, and the profile is formed by forming an angle between the mesh shelves of the profile by sequentially folding them towards each other.

When implementing the method as a preform, use a tape with a width equal to the length of the shelf in unstretched condition.

In the manufacture of a mesh with diamond-shaped cells, pairwise extraction of two extreme rows of slots of the workpiece symmetrical with respect to the longitudinal axis is carried out to the calculated width of the rhombus, while drawing is carried out from the extreme rows to the symmetry axis of the workpiece with a sequential transition through the stands.

To improve the quality of the finished product after the formation of the angle, the outer surface of the profile shelves in the additional working stand can be aligned.

Characteristics of the manufactured product:

- the corner mesh profile has two shelves oriented at an angle from 70 to 90 ° to each other; on each of them, along the length of the profile, slots are formed, symmetrical with respect to the longitudinal axis of the profile, the rows are staggered with the offset of each row by half a step;

- after drawing, the notches form a mesh ribbed surface with diamond-shaped cells;

- at the junction of the shelves a transitional section is formed, having in cross section two parallel walls, conjugated by a cylindrical surface facing the outside of the profile and having a radius of about 1.9 mm;

- the distance between the walls is about 5 mm, on the section from 30 to 50 mm of the total length of the shelf, the profile surface is solid, and further to the edge of the shelf - mesh.

The profile can be made of steel — galvanized tape (strip), stainless steel tape (strip), aluminum alloys, while the width of the tape is equal to or less than the length of the shelf.

The technical result from the use of the invention is that the proposed method allows, while ensuring full automation of production due to the proposed sequence of operations:

- reduce the intensity of one product, without reducing its quality indicators;

- reduce the complexity and energy consumption of manufacturing by reducing technological operations (lack of dies, hydraulic systems).

The technical result is achieved due to the fact that the method consists in sequentially moving a strip metal workpiece with a width equal to the length of the profile shelf (in unstretched condition) in a multi-stand roll forming mill, where, according to the design of the transitions from stand to stand, the working tools of the roll forming mill form a longitudinal a groove located along the axis of symmetry of the workpiece, rows of slots are applied to the workpiece, successively drawing out the slots to the required dimensions and form a predetermined cross The cross section of the angular profile. At the exit from the mill, the cutting device cuts off the specified length of the part, which is fed to the receiving table.

Moreover, in the first working stand of the roll forming mill along the entire longitudinal axis of symmetry of the workpiece, a groove is formed that acts as a stiffener.

In the second stand, according to the calculated (predetermined) scheme, rows of discontinuous longitudinal slots are applied to the workpiece, arranged in a checkerboard pattern with a shift of half a step (half the length of the slot).

In the third (“ironing”) stand, the surface of the shelf is aligned with the slots from possible deformations and traces of knives.

In the fourth stand, the extreme rows of slots are drawn to the calculated (given) width of the mesh rhombus.

From the fifth stand to the eighth stand, the following rows of slots are alternately drawn, moving from the edge to the center of the workpiece.

From the ninth to the twelfth stand, sequential bending performs the forming of the angle between the shelves of the profile to the calculated value and adjusts the cross-sectional parameters of the profile to the required values.

When forming the profile angle, the parallel edges of the mesh rhombuses automatically rotate through an angle of up to 90 °, which makes the mesh surface ribbed.

After completion of the cross-sectional formation, a profile of a given length is cut with a cutting device and the finished part is fed to the receiving table.

The invention is illustrated by drawings, which depict:

figure 1 is a diagram of the implementation of the gutter on the workpiece in the first mill stand;

figure 2 - diagram of the application of slots on the strip blank;

figure 3 - section EE in figure 2;

figure 4 is a diagram of the implementation of the slots in the second working stand;

figure 5 - diagram of the tool when drawing slots;

Fig.6 is an explanation of the operation of the tool of the working stand when drawing slots;

7-11 is a diagram of a sequential drawing of slots in stands from the fourth to the eighth;

on Fig-15 is a diagram of the under-bed sequential formation of a transverse angular mesh profile;

on Fig is a side view of the profile;

on Fig - connection of the shelves of the angular mesh profile.

The essence of the proposed method is disclosed by the example of manufacturing an angular mesh profile using the expanded method on a multi-strand bending mill of an automatic line. The method is described with reference to a specific profile size.

To obtain an angular mesh profile of 35 × 35 × 0.4 - use a metal strip of aluminum, aluminum alloy, stainless steel or galvanized steel grade OTs 0.6 × 35 TU 14-1-47 66-90, a width of 35 mm, equal to the length profile shelves (shelf length is the distance from the top of the corner of the profile to the edge of the shelf).

The parameters of the rhombus grid are 10 × 27 mm and the parameters of the structural elements of the calculated cross section: φ ₄ = 76 °; α ₄ = 90 °; R ₄ = 1.9 mm; R ₅ = 2.5 mm; R ₆ = 0.2 mm; r ₃ = 0.2 mm; δ = 1.5 mm; a ₁ = 3.6 mm; a ₂ = 5 mm; a ₃ = 5.4 mm; b = 12.5 mm.

Prior to the start of profile manufacturing operations, an estimated length, for example 3 m, is set, the value of which is entered into the line program for the orienting device with the tape feed counter unit and the cutting device.

The method is as follows.

The strip from the roll is fed into a roll forming mill, where according to the transition scheme of the workpiece from the stand to the stand, the workpiece receives a predetermined cross-section of the profile.

In the first working stand of the roll forming mill (Fig. 1), a longitudinal groove 2 is formed on the workpiece (tape) 1 with the following parameters: R = 5 mm, r = 1.5 mm, α = 35 ° 30 '.

These parameters do not change further during transitions from stand to stand until the ninth stand.

In the second working stand (figure 4), on the tape 1 with special cutting grooves of the upper and lower disk knives in the staggered manner, cuts (cuts) are applied with a shift of half a step, that is, half the length of the slot (figures 2 and 3), the number of rows of slots is determined by the number of cutting discs simultaneously applying slots. The width of the slots depends on the thickness of the cutting discs (e.g. 1.5 mm). The distance between the slots (width of the jumpers) is equal to the distance between the cutting discs (e.g. 1.5 mm).

In the third (“ironing”) stand for better subsequent drawing, the surface of the shelf is leveled and the cuts applied to exclude possible traces of knives or slight deformation of the cuts after drawing are made using smooth disks of the working tool located along the axes of the cuts formed in the second crates.

In the fourth stand (Fig. 7), two extreme symmetrical rows of slots 4 are drawn to the design width of the rhombus 5 (Figs. 5, 6), for example, equal to 10 mm.

In the fifth stand (Fig. 8), the next two symmetrical rows of 6 are drawn out, located closer to the center of the workpiece, in the sixth stand, rows 7 are pulled (Fig. 9), in the seventh stand, rows 8 (Fig. 10), in the eighth stands - rows 9 (Fig.11).

Moreover, on the workpiece symmetrically to the longitudinal axis, on either side of the trough, a continuous strip of metal 10 is preserved.

From the ninth stand to the twelfth stand (Fig. 12-15), the angle between the shelves of the profile and the parameters of its cross section are formed to the calculated values (shown in Figs. 16, 17 and 18):

from φ ₁ = 44 ° to 76 °;

from α ₁ = 35 ° 30 'to α ₄ = 90 °;

from R ₁ = 5 mm to R ₄ = 1.9 mm; R ₅ = 2.5 mm; R ₆ = 0.2 mm.

As a result of the formation, the angular mesh profile has two shelves 11, oriented at an angle from 70 to 90 ° to each other, the surface of the shelves is mesh-ribbed, the mesh 12 has a diamond-shaped structure, while the edges of the rhombuses 13 are automatically rotated to an angle of 90 up to 90 ° in relation to the plane of the jumpers.

At the junction of the shelves, a transition section is formed in the form of two walls 14 parallel to each other, joined by a cylindrical surface convex to the outside of the profile, on both sides of which the shelves have continuous stripes with a width of 30 to 50% of the length of the shelves 10.

After completion of the cross-sectional formation, the workpiece is transferred to a cutting device, and the finished part is fed to the receiving table and further packaging.

In the profile intended for puttying, the operation of leveling the outer surface of the shelf in the additional working stand of the mill can be performed.

Claims (4)

1. A method of manufacturing a corner mesh profile from a workpiece in the form of a metal strip or tape, comprising moving the workpiece into a multi-stand roll forming mill, in which a workpiece is perforated and a profile is formed, characterized in that a longitudinal chute, perforation is formed along the workpiece length along its axis of symmetry blanks are formed in the form of a diamond-shaped mesh by applying to the surface of the blanks rows of longitudinal slots, equal in length and located in adjacent rows with an offset relative to each other tionary another by half the entire length, and sequential stretching of outer slits into slots positioned closer to the axis of symmetry of the preform, and the profile is formed as an angle between the mesh shelves profile of their serial podgibkoy towards each other. 2. The method according to claim 1, characterized in that as a preform use a tape with a width equal to the length of the shelf in unstretched condition. 3. The method according to claim 1, characterized in that the diamond-shaped mesh is obtained in pairs by drawing two extreme symmetrical relative to the longitudinal axis of the rows of slots of the workpiece to the calculated width of the rhombus, while drawing is carried out from the extreme rows to the axis of symmetry of the workpiece with a sequential transition through the stands. 4. The method according to any one of claims 1 to 3, characterized in that after forming the angle, the outer surface of the shelves of the profile is aligned in an additional working stand.

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