Reinforcement steel producing method

FIELD: metallurgy, namely production of reinforcement steel for reinforcing concrete structures.

SUBSTANCE: method comprises steps of making reinforcement steel by cold deformation in two roller draw plates with crosses axes of their rollers; at deforming blank in gap between rollers of first draw plate forming periodical dents; at deforming blank in gap between rollers of second draw plate imparting to blank appearance of ready product and simultaneously forming periodical dents on it. According to invention deforming is realized through gaps formed by rollers with cylindrical working surfaces at elongation factor of first draw plate no more than 1.2 and at elongation factor of second draw plate no more than 1.6. At working of blank deformation is uniformly distributed in surface layers of blank along its perimeter providing homogenous structure while structure of central layers of blank remains the same, that is hot rolled structure.

EFFECT: improved plastic properties of steel.

1 tbl, 4 ex

 

The invention relates to the processing of metals by pressure and can be used in the manufacture of reinforcing steel for reinforcement of concrete structures.

The process of manufacturing of reinforcing steel (see, for example, Wegmarken, Specilied. Mechanical properties of low carbon steel after hot rolling, drawing and cold heading. Express information, Central research Institute of information and technical-economic studies of ferrous metallurgy. - M., 1974, Series No. 9, Issue No. 7, p.17-18) is characterized by the fact that the hot rolled billet is subjected to deformation hardening, changing 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. 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 method of obtaining reinforcing steel, including deformation of the workpiece in a rolling trail with a vertical rollers having a smooth barrel with compression on the minor axis of the oval is equal to the difference of the original diameter of the workpiece and the diameter of the shank of the finished profile, and the subsequent settling of the oval-shaped profile in the main portage with the formation of the ribs, and before settling oval-shaped profile with a flat side walls pass through the wiring with a rectangular opening whose width 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 method is the use of significant reductions in cold plastic deformation rod on smooth rolls and profileru.exe caliber. 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.

Closest to the invention is a method for manufacturing reinforcing steel cold deformation in two roller what's roads the direction of the axes of the rollers which overlap, by deformation of the workpiece in the gap between the rollers of the first drawing dies with the simultaneous formation of periodic protrusions and create strain in the first trench section view of the finished profile by deformation in the gap between the rollers of the second drawing dies with the simultaneous formation of periodic protrusions (see Japan patent No. 52-17820, class 12, 32, IPC B 21 D 11/12, 1977).

In the deformation process in the first portage steel wire stretch across the gap of the elliptical shape, and deformation in the second trench through the clearance circle of small diameter.

The disadvantages of this method are as follows. In the first pass, the deformation of the round billet is carried out from 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), deformed 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, there is uneven distribution of strain over the cross section: Central the s layers are not deformed at all, and all the deformation is concentrated in the minor depth of the surface layer. 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. This combined with the uneven distribution of properties over the cross section of the processed wire leads to the reduction of the plastic properties of the finished profile. To increase the plasticity requires additional manufacturing operations, for example, heat treatment.

In addition, since the deformation is carried out in the mortise (angular) caliber, due to the difference in linear velocities at the contact surface there is an 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 by a known method, in addition to the above drawbacks, is the difficulty in ensuring the production of concrete reinforcement wire without undercuts and stripes, and guaranteed the exclusion of their requires additional axial configuration calibers and constant contact is the role of accuracy in the setting during the production.

The objective of the proposed method is to improve the plastic properties of reinforcing steel.

The technical result of the present invention is that in the process of manufacturing of reinforcing steel due to the fact that the ratio of shift amounts determined by using two passes of a roller with a cylindrical working surface in combination with the absolute magnitude of the deformation at the boundaries of performance hoods in each iteration, leads to a uniform deformation in the cross section. This method allows to obtain the reinforcing steel from the equilibrium structure, with high plastic properties conforming to the requirements of the European standard.

In addition, this method allows you to use both portages similar rollers, which reduces the cost of reinforcing steel. The possibility of using a 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 method of manufacturing a reinforcing steel cold deformation in two roller dies, the directions of the axes of the rollers which overlap, by deformation of the workpiece in z is ezzor between the rollers of the first drawing dies with the simultaneous formation of periodic protrusions and create strain in the first trench section view of the finished profile by deformation in the gap between the rollers of the second drawing dies with the simultaneous formation of periodic protrusions deformation carried out through the gaps formed by the rollers with cylindrical working surface, with the drawing ratio in the first trench not more 1,12, and the second not more than 1,16.

As illustrative material is a table summarizing the changes to operating parameters of reinforcing steel periodic profile depending on the ratio of the extrusion deformation in 2-roller portages formed by rollers with cylindrical working surface.

In accordance with the HUNDRED ASCM 7-93 mechanical properties of reinforcing steel shall not be less than:

- temporary tear resistance (σ), N/mm2- 600;

- conventional yield strength (σof 0.2), N/mm2- 500;

- elongation, δ5, % - 14;

- full elongation at maximum force, δp, % - 2,5.

The proposed method is implemented as follows.

Example 1.

Hot rolled blank of circular cross section do=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, the directions of the axes of the rollers which intersect at an angle of 90°. Deforming the gap of each drawing dies formed 2 rollers with a diameter of 140 mm from the cylinder the practical work surface. On the cylindrical surface of each roller of both fiber caused grooves at an angle to the generatrix of the surface of the rollers with step t=5,0±0,05 mm

The workpiece passing through the gap L1=5,40 mm in the first stand, crimped with two opposite sides, with the drawing ratio 1,079, forming in cross section a flat oval. At the same time due to the grooves on the working surfaces of the rollers on objetych surfaces of the workpiece are formed protrusions, forming a periodic profile.

After the rollers of the first drawing dies except objetych surfaces on the workpiece remain undeformed surface.

Next, the workpiece is directed into the gap L2=5,35 mm, formed by the rollers of the second drawing dies. Compression is performed with the simultaneous application of periodic projections on the planes perpendicular to the planes of the deformed first portage. When this deformation is performed with the drawing ratio 1.11 and give the cross-section reinforcing steel appearance of the finished profile of the square with outstanding angles, and the outer contour is circular, the actual diameter of df=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.

The mechanical properties of the original piece had average values (over 10 trials):

in the b tear resistance (σ in), N/mm2- 570;

- conventional yield strength (σof 0.2), N/mm2- 435;

- elongation, δ5, % - 25,0.

The mechanical properties of the anchor steel finish profile have the following meanings:

- temporary tear resistance (σ), N/mm2- 610;

- conventional yield strength (σof 0.2), N/mm2- 510;

- elongation, δ5, % - 25,6;

- full elongation at maximum force δp, % - 4,9.

Example 2.

Hot rolled blank of circular cross section do=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, the directions of the axes of the rollers which intersect at an angle of 90°. Deforming the gap of each drawing dies formed 2 rollers with a diameter of 140 mm with a cylindrical working surface. On the cylindrical surface of each roller of both fiber caused grooves at an angle to the generatrix of the surface of the rollers with step t=5,0±0,05 mm

Compression is performed with the simultaneous application of periodic protrusions with a drawing ratio 1,092 in the first trench with a gap L1=5.25 mm and with a drawing ratio of 1.13 in the second trench with a gap L2=5,15 mm, give the cross-section reinforcing steel appearance of the finished profile - square with outstanding the Glami, and by the external contour is circular, the actual diameter of df=5,86 mm

The mechanical properties of the anchor steel finish profile have the following meanings:

- temporary tear resistance (σ), N/mm2- 620;

- conventional yield strength (σof 0.2), N/mm2- 520;

- elongation, δ5, % - 19,0;

- full elongation at maximum force δp, % - 4,0.

Example 3.

Hot rolled blank of circular cross section do=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, the directions of the axes of the rollers which intersect at an angle of 90°. Deforming the gap of each drawing dies formed 2 rollers with a diameter of 140 mm with a cylindrical working surface. On the cylindrical surface of each roller of both fiber caused grooves at an angle to the generatrix of the surface of the rollers with step t=5,0±0,05 mm

Compression is performed with the simultaneous application of periodic protrusions with a drawing ratio 1,105 in the first trench with a gap L1=5,15 mm, then the second trench with a gap L2=of 5.05 mm and a drawing ratio of 1.14, give the cross-section reinforcing steel appearance of the finished profile - square with outstanding angles, and the outer contour is circular, articheski a diameter of d f=5,70 mm

Mechanical properties of reinforcing steel finish profile have the following meanings:

- temporary tear resistance (σ), N/mm2=630;

- conventional yield strength (σof 0.2), N/mm2=550;

- elongation, δ5, % =17,0;

- full elongation at maximum force δp % =3,8.

Example 4.

Hot rolled blank of circular cross section do=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, the directions of the axes of the rollers which intersect at an angle of 90°. Deforming the gap of each drawing dies formed 2 rollers with a diameter of 140 mm with a cylindrical working surface. On the cylindrical surface of each roller of both fiber caused grooves at an angle to the generatrix of the surface of the rollers with step t=5,0±0,05 mm

Compression is performed with the simultaneous application of periodic protrusions with a drawing ratio 1,120 in the first trench with a gap L1=4,90 mm, then the second trench with a gap L2=of 5.05 mm and a drawing ratio of 1.16, give the cross-section reinforcing steel appearance of the finished profile - square with outstanding angles, and the outer contour is circular, the actual diameter of df=5,61 mm

Mechanical properties of the reinforcing steel finish profile have the following meanings:

- temporary tear resistance (σ), N/mm2- 670;

- conventional yield strength (σof 0.2), N/mm2- 580;

- elongation, δ5, % - 14,0;

- full elongation at maximum force δn, % to 2.6.

Strain through a flat gaps formed by the rollers of cylindrical shape with a drawing ratio of 1.12 in the first pass, creates in the metal in the surface layers of the zone of intensive plastic deformation, simultaneously activating the slip plane for subsequent passage.

Further deformation of the workpiece in the second pass through the plane of the gaps formed by the rollers of cylindrical shape with a drawing ratio of 1.16, forms a plastic region, which, being closed with deformation zones formed in the first pass, creates plastic area, evenly distributed around the perimeter of the finished profile.

To carry out the deformation with the drawing ratio in the first pass over 1,12 impractical, since in combination with the flat shape of the caliber is more intensive strengthening and the penetration of plastic areas in the interior of the section that defines irrational for the second pass, the ratio of shift amounts of metal.

To carry out the deformation with the drawing ratio in the second pass over 1.16 also neceesary is but as in this case, as in the first pass, there is an unfavorable distribution of plastic areas, including much of the Central zone is subjected to deformation, the plastic region of the first and second passages are 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, a given mode of deformation provides the necessary level of reduction plastic properties, in which the profile meets the requirements of performance anchor properties corresponding to the HUNDRED ASCM 7-93.

While the test results show that the cold deformation by elongation ratio, mentioned above, does not require additional operations, in particular thermal, to improve plastic properties. However, the increase of the elongation ratio entails the deterioration of the plastic properties, which is confirmed by the data of the strength tests.

Thus, in the manufacturing process of reinforcing steel in the proposed method, the deformation is uniformly distributed in the surface layers of the workpiece along its perimeter, forming a homogeneous structure.

The uniformity of p is ctory is the cause of the uniformity of mechanical properties, and in particular, of plastic. The structure of the Central layers in the workpiece remains invariant, i.e. hot-rolled, which is the most plastic structural metal state.

All this ensures high ductility of the reinforcing steel periodic structure obtained by the proposed method.

In addition, the use of cylindrical working surface for making periodic structure greatly simplifies the cutting of depressions 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.

Using the proposed method, a flat gap for the deformation of the workpiece eliminates the problem of undercuts and sunsets and moustache on the finished profile that may take place in the mortise corner caliber.

A method of manufacturing a reinforcing steel cold deformation in two roller dies, the directions of the axes of the rollers which overlap, by deformation of the workpiece in the gap between the rollers of the first drawing dies with the simultaneous formation of periodic protrusions and create strain in the first trench section view of the finished profile by deformation in the gap between the rollers of the second drawing dies simultaneously with the time of the formation of periodic protrusions, characterized in that the deformation is carried out through the gaps formed by the rollers with cylindrical working surface, with the drawing ratio in the first trench not more 1,12, and the second not more than 1,16.



 

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