Plant for production of reinforcing bar steel

FIELD: metallurgy; production of reinforcing bar steel.

SUBSTANCE: proposed plant is used for production of reinforcing bar steel by cold deformation method. Proposed plant includes two roller drawing dies; axes of their rollers intersect and working surface is provided with periodic profile ragging. Rollers have cylindrical surface and clearance between rollers is so selected that cogging in first drawing die is carried out at drawing coefficient not exceeding 1.12 and in second drawing die not exceeding 1.16. Provision is made for conducting cold deformation at which deformed zones are smoothly distributed in surface layers over entire perimeter of reinforcing bar steel keeping the structure of central layers non-deformed and hot rolled, thus making it possible to obtain steel with equilibrium structure possessing high ductility.

EFFECT: enhanced ductility of steel.

4 dwg, 1 tbl, 3 ex

 

The invention relates to the processing of metals by pressure, in particular to a device for the manufacture of reinforcing steel by cold deformation.

Fabrication of reinforcing steel by cold deformation (see, for example, Wegmarken, Specili "Mechanical properties of low carbon steel after hot rolling, drawing and cold heading" Express information, Central research Institute of information and technical-economic research in ferrous metallurgy, M., 1974, Series No. 9, Issue No. 7, p.17-18) is characterized by the fact that in the hot-rolled blank is subjected to deformation hardening, changes of structural and substructural state of the metal with a pearlitic structure. As a consequence, increases the strength and deteriorate plastic characteristics. And the intensity of deterioration of the plastic properties (relative and uniform) higher than the intensity of hardening.

This adversely affects the performance characteristics of the finished reinforcing steel because of the high ductility of the reinforcing steel is a very important condition for the choice of reinforcing steel for mass consumption. Plastic reinforcement significantly reduces the risk of progressive (avalanche) destruction of prefabricated concrete elements, allows to increase the reliability and durability of buildings and the structures are built. The production of reinforcing steel due to the necessity of obtaining the finished profile, the reinforcement ratio which corresponds to the values approved by GOST or TU.

A device for the manufacture of reinforcing steel by cold deformation, including roller fibrous, consisting of two consecutive mutually perpendicular pairs of working rolls, between which a maximum possible approach to profiling rollers fixed plate with a rectangular hole, and the first pair of rollers have a smooth working surface, and the second pair of rollers are performed with periodic reinforcement profile and width of the rectangular hole in the plate is equal to the width of the oval-shaped profile along the minor axis of the oval (see RF patent №2058843, the IPC 21 1/00, 1992).

The disadvantage of this device lies in the fact that cold plastic deformation rod on smooth rolls and profileru.exe caliber is carried out with significant reductions. This leads to the complete exhaustion of ductility of the original rod, especially from low-carbon steel, and makes it impossible to obtain high plastic properties in the finished valve, for example, in accordance with the HUNDRED ASCM 7-93, EN 10080.

In addition, the use of the plate reduces the performance of the device is, as the manufacturer of each new profile reinforcement steel required to carry out the operation to dismantle a plate and mount the new plate.

Closest to the invention is a device manufacturing reinforcing steel cold deformation, including two roller portages, the directions of the axes of the rollers which overlap, and the working surface has a notch periodic profile (see Japan patent No. 52-17820, class 12, 32, IPC B 21 D 11/12, 1977).

In addition, in the first portage on the working surfaces of the rollers have grooves semi-elliptical shape, and the second portage on the working surfaces of the rollers have grooves semicircular shape.

The disadvantages of the known device are as follows.

Deformation of a round workpiece in a first pass is performed with four sides with relatively small reductions, that is, there is quadrilateral diagram of the major threads of the metal flow in the direction of the gaps caliber implemented two streams of displacement. However, due to the restraining action of the side walls of the caliber of these minor streams and deformation in the direction of the connectors is small. In the second pass, according to the scheme (S), deform only a small ousted in the first pass, the volume of the metal. As a result of this scheme of deformation in the finished profile n the observed uneven distribution of strain over the cross section: all deformation is concentrated in the minor depth of the surface layer, moreover, uneven in width. This leads to a difference in mechanical properties over the cross section of the finished profile, and can also cause the appearance in the surface layer of the significant tensile residual stresses. In conjunction with the uneven distribution of properties over the cross section of the processed wire that leads to the reduction of the plastic properties of the finished profile. To increase the plasticity requires additional technological operations such as heat treatment.

In addition, the use of rollers made with mortise (angular) size leads to deformation with different linear velocities at the contact surface, resulting in the observed additional non-uniformity of the stress distribution on the contact surface, which also reduces the ductility.

In addition, manufacturing mortise streams, and even more cuts on their surface grooves (recesses) requires expensive equipment, reduces productivity and increases the cost of production. Deformation in the mortise (angular) streams in the known device, in addition to the above drawbacks, does not provide fabrication of reinforcing steel without undercuts and stripes, and guaranteed the exclusion of their requires additional axial configuration of the gauges and continuous monitoring of accuracy in attitude is E.

The task of the invention is to improve the plastic properties of reinforcing steel.

The technical result of the present invention is that the proposed device allows cold deformation, in which the resulting deformed zones are evenly distributed in the surface layers around the perimeter of the reinforcing steel, leaving the structure of the Central layers of the undeformed hot-rolled, this allows you to receive reinforcing steel with equilibrium structure with high plastic properties conforming to the requirements of the European standard.

In addition, this device allows you to use both portages similar rollers, which reduces the cost of reinforcing steel. The use of rollers with cylindrical working surface for making periodic structure greatly simplifies the cutting edge. In this case, changing the way of cutting, simplified equipment improves the performance.

This technical result is achieved by the fact that in the known device fabrication of reinforcing steel by cold deformation, including two roller portages, the directions of the axes of the rollers which overlap, and the working surface has a notch periodic pros who I am, the rollers are made with a cylindrical working surface, and the gap between the rollers is selected from the condition of providing compression in the first trench with a drawing ratio of not more than 1,12, and the second not more than 1,16.

As illustrative materials are four drawing and the table representing operational parameters of reinforcing steel periodic structure fabricated on the device proposed design, and their compliance with the HUNDRED ASCM 7-93, in part ancarola and mechanical properties of the class AS. Figure 1 shows a diagram of the device, side view; figure 2 shows a section along a-a in figure 1; figure 3 presents a view of the workpiece after deformation in the first pair of rollers in a section along b-b In figure 1; figure 4 shows a view of the finished profile after deformation of the workpiece in the second pair of rollers in cross section C-C in figure 1.

The proposed device for the manufacture of reinforcing steel includes two roller drawing dies: the first with rollers 11' and the second with rollers 22'. Axis 33' rollers 11' first portages intersect with the axes 44' rollers 22' of the second drawing dies at 90°. The working surface of the rollers 11' and 22' in both portages has a cylindrical surface with notches 5 at an angle to the generatrix of the surface of the rollers. In the first portage gap between the rollers 11' is equal to L1whose value is selected from a compression round the workpiece 6 with the drawing ratio is not more of 1.12 to obtain the deformed cross-section C-C. The second portage gap between the rollers 22' is equal to L2whose value is chosen from the condition of providing compression with a drawing ratio of not more than 1.16 In section, obtained after the first stands for the deformation ready periodic profile cross-section C-C. For pulling the workpiece in the rollers 11' first drawing dies and rollers 22' of the second drawing dies used for drawing mill with pulling drum (not shown).

Fabrication of reinforcing steel as follows.

Example 1.

Hot rolled billet 6 of circular cross section of diameter d0=6.4 mm with mechanical properties class IS subjected to cold deformation with the help of a drawing drum for drawing mill two roller dies formed by rollers 11' and 22' with a diameter of 140 mm In the first portage hot rolled billet 6 passes through the gap L1=5,40 mm, formed by rollers 11', and is crimped with a drawing ratio 1,079, forming in cross section a flat oval with periodic tabs on objetych surfaces are applied with notches 5 on the working surfaces of the rollers 11'. In addition objetych flat surfaces with periodic profile on the workpiece 6 remain undeformed surface.

Next, the workpiece 6 is directed into the gap L2=5,35 mm, formed by rollers 22', the axes of which 44' perpendicular to axis 33' rollers 11' first is th portages. This arrangement of rollers in the gap L2formed by the rollers 22' of the second drawing dies, deform the surface of the workpiece 6, where the gap L1formed by rollers 11' first drawing dies.

In the gap L2the workpiece is deformed in the second trench with a drawing ratio, equal to 1.11 according to the principle described for the first drawing dies and the workpiece takes the form of reinforcing steel finish periodic profile. View the finished profile - outstanding at the corners of a square outer contour of the circle. Weight diameter of the finished profile - 5,95 mm the Mechanical properties of the finished profile of reinforcing steel correspond to the mechanical properties of reinforcing steel periodic profile class AS in accordance with the HUNDRED ASCM 7-93.

Example 2.

Hot rolled billet 6 of circular cross section of diameter d0=6.4 mm with mechanical properties class IS subjected to cold deformation with the help of a drawing drum for drawing mill two roller dies formed by rollers 11' and 22' with a diameter of 140 mm In the first portage hot rolled billet 6 passes through the gap L1=5.25 mm, formed by rollers 11', and is crimped with a drawing ratio 1,092, forming in cross section a flat oval with periodic tabs on objetych surfaces are applied with notches 5 on the working surface is chestah roller 11'. In addition objetych flat surfaces with periodic profile on the workpiece 6 remain undeformed surface.

Next, the workpiece 6 is directed into the gap L2=5,15 mm, formed by rollers 22', the axes of which 44' perpendicular to axis 33' rollers 11' first drawing dies. This arrangement of rollers in the gap L2formed by the rollers 22' of the second drawing dies, deform the surface of the workpiece 6, where the gap L1formed by rollers 11' first drawing dies.

In the gap L2the workpiece is deformed in the second trench with a drawing ratio, equal to 1.13 according to the principle described for the first drawing dies and the workpiece is attached to the end section With periodic profile of reinforcing steel. View the finished profile - outstanding at the corners of a square outer contour of the circle. Weight diameter of the finished profile - 5,95 mm the Mechanical properties of the finished profile of reinforcing steel correspond to the mechanical properties of reinforcing steel periodic profile class AS in accordance with the HUNDRED ASCM 7-93.

Example 3.

Hot rolled billet 6 of circular cross section of diameter d0=6.4 mm with mechanical properties class IS subjected to cold deformation with the help of a drawing drum for drawing mill two roller dies formed by rollers 11' and 22' with a diameter of 140 m is. In the first portage hot rolled billet 6 passes through the gap L1=5,15 mm, formed by rollers 11', and is crimped with a drawing ratio 1,105, forming in cross section a flat oval with periodic tabs on objetych surfaces are applied with notches 5 on the working surfaces of the rollers 11'. In addition objetych flat surfaces with periodic profile on the workpiece 6 remain undeformed surface.

Next, the workpiece 6 is directed into the gap L2=of 5.05 mm, formed by rollers 22', the axes of which 44' perpendicular to axis 33' rollers 11' first drawing dies. This arrangement of rollers in the gap L2formed by the rollers 22' of the second drawing dies, deform the surface of the workpiece 6, where the gap L1formed by rollers 11' first drawing dies. In the gap L2the workpiece is deformed in the second trench with a drawing ratio, equal to 1.14 according to the principle described for the first drawing dies and the workpiece is attached to the end section of the periodic structure of reinforcing steel. View the finished profile - outstanding at the corners of a square outer contour of the circle. Weight diameter of the finished profile - 5,95 mm the Mechanical properties of the finished profile of reinforcing steel correspond to the mechanical properties of reinforcing steel periodic profile class AS pursuant ssto ASCM 7-93.

Cold deformation carried out in the first trench through a flat gap formed by the rollers 11', the size of which is selected from the condition of providing compression with a drawing ratio of not more than 1,12, creates in the metal in the surface layers is favorable to the distribution and character of the zone of intensive plastic deformation, simultaneously activating the slip plane for subsequent passage.

Further deformation of the workpiece in the second portage over a flat gap L2formed by the rollers 22', the size of which is selected from the condition of providing compression with a drawing ratio of not more than 1,16, forms a plastic region, which, being closed with deformation zones formed by deformation in the first portage, create deformed area, evenly distributed around the perimeter of the finished profile.

The choice of the gap between the rollers 11' in the first portage less than L1=4,95 mm impractical, because it entails increasing the drawing ratio, which in combination with the flat shape of the caliber leads to more intense hardening and penetration of plastic areas into sections, determining irrational for the second pass, the ratio of shift amounts of metal.

The choice of the gap between the rollers 22' in the second portage less than L2=4,85 mm impractical, as it brings to the fight increasing drawing ratio, and, as with the deformation in the first portage, is unfavorable distribution of plastic areas, including much of the Central zone is subjected to deformation, the plastic region of the first and second passage closed perimeter unevenly. All this significantly impairs plastic properties and does not provide the solution of the technical problem.

Comparative analysis shows that the mechanical properties of reinforcing steel are increased, while the plastic properties are reduced.

However, the deformation in the proposed device through the gaps, the size of which is specified above conditions provides the desired level of reduction of plastic properties, and the profile meets the requirements of performance anchor properties corresponding to the HUNDRED ASCM 7-93.

Thus, the tests show that the implementation of the deforming rollers with cylindrical working surface, with the gaps between the rollers in the portages, providing compression with elongation ratio, mentioned above, leads to the formation of uniform strain across the section that allows you to get the rebar with the equilibrium structure having a high plastic properties. Resulting cold deformation offered by the device does not require additional operations, testosteronic, to improve the plastic properties. The structure of the Central layers in the workpiece remains invariant, i.e. hot-rolled, which is the most plastic structural metal state.

However, the reduction of the gap between the rollers of the first and second fiber increases the elongation ratio and causes deterioration of the plastic properties, which is also confirmed by the data of the mechanical tests.

In addition, the use of cylindrical working surface for making periodic structure greatly simplifies the cutting of notches on the surface of the rollers. In this case, changing the way of cutting, simplified equipment, increases productivity and significantly reduced the cost of production of reinforcing steel.

In addition, the proposed device allows cold deformation in flat gap, with free-flow metal in the gap, this eliminates the problem of undercuts, sunsets and moustache on the finished profile that improves the quality of reinforcing steel.

Device for the manufacture of reinforcing steel by cold deformation, including two roller portages, the directions of the axes of the rollers which overlap, characterized in that the rollers are made with a cylindrical working surface on which Imatrankoski periodic structure, while the gaps between the rollers in the portages selected from conditions provide compression in the first trench with a drawing ratio of not more than 1,12, and the second not more than 1,16.



 

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