UA113107C2 - LINE FOR PRODUCTION OF REINFORCEMENT RENTAL - Google Patents

Abstract

The invention relates to technological lines for the manufacture of rebar rolling periodic profile in the bins of low carbon and low alloy steel for reinforced concrete structures. The invention solves the problem of providing a process for the manufacture of reinforcing bars with a high level of strength and plastic properties. The line for the manufacture of rolled steel rods of the smooth round rod contains in the technological sequence the unwinding device, the device for removing scale, the device for applying oil, the device of active deformation in the form of a block of rollers, the device of cyclic deformation, traction drum and device. The line is equipped with additional devices - the first low-frequency inductor (NO) is located in front of the active deformation device, and the second low-frequency inductor (NO) and high-frequency inductor (VI) are located behind the cyclic deformation device. In addition, between the active deformation device and the cyclic deformation device there is a water-air sprayer, and the first low-frequency inductor (NO), water-air sprayer, the second low-frequency inductor (NO), high-frequency inductor (VI), installed non-contact devices.

Description

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The invention belongs to the technological lines for the production of rebar of a periodic profile in coils of low-carbon and low-alloy steel, which can be used for welded meshes as reinforcing elements of monolithic and prefabricated reinforced concrete structures, as well as in structural elements of buildings in the form of individual rods, for reinforcing highways and coverings of airfields.

From the previous state of the art, a technological line for processing wire rod into rebar of class B500C is known (O.V. Ivchenko. Production of rebar of classes ABOOS and B5O0C by cold deformation of high-strength blanks from ordinary grades of steel //

Metallosnabzhenie i sbt, 2008, Mo 11, pp. 100-103), which includes an unwinding device, a scale removal mechanism (scale breaker), a roller drag, a drawing stand and a winding device. The production of cold-formed reinforcing bars on this line from ordinary billets - wire rods does not provide the required quality due to the low level of plastic properties of the finished products. In addition, the presence of one unwinding device for the workpiece and one winding device for finished products significantly affects the manufacturability of production, reduces the productivity of the line due to frequent stops for loading raw materials (workpieces) and cleaning finished products.

The prototype of the proposed invention, which is as close as possible in its technical essence and the result achieved, is a technological line for the production of cold-deformed reinforcing wire (VO Mo 2302916, class B21С 1/00, publ. 07/20/2007, BI Mo 20, 2007 ), which includes an unwinding device, a device for mechanical scale removal, a device for applying lubricant, a block of roller sheaves, a multi-plane bending roller device, a driven pulling drum and a driven winding device (a device for forming skeins) arranged in sequence and connected in one technological chain.

The disadvantages of this technological line are that in the area between the block of roller sheaves and the traction drum, in the three-plane bending roller device, the wire is pulled out, which reaches 895, which significantly affects the change in the geometric parameters of the periodic profile of the finished product and significantly reduces its plastic properties. which brings the latter to the level of deficient values. All this does not allow to obtain finished products with high values of strength and plastic properties of reinforcement in accordance with the requirements

From modern normative documents (ND). In addition, a number of foreign NDs regulate additional operational properties of reinforcement, which include a high level of plasticity (for construction in seismically active zones) and corrosion resistance (for construction in coastal zones and areas with a humid climate).

The proposed invention solves the problem of ensuring the process of manufacturing rebar with a high level of strength and plasticity, as well as operational properties in accordance with the requirements of national and international standards.

The task is solved by the fact that the proposed line for the production of rebar from smooth round wire rod, which contains an unwinding device, a scale removal device, a device for applying lubricant, an active deformation device in the form of a block of roller sheaves, a cyclic deformation device, a tensile device placed in a technological sequence a drum and a device for forming skeins, additionally equipped with two low-frequency inductors and a high-frequency inductor. At the same time, the first low-frequency inductor (NiIi) is located in front of the active deformation device, and the second low-frequency inductor (Nig) and the high-frequency inductor (VI) are located behind the cyclic deformation device. In addition, a water-air sprayer is additionally placed between the active deformation device and the cyclic deformation device. Non-contact devices are installed between the first low-frequency inductor (NI) and the active deformation device, the water-air sprayer and the cyclic deformation device, the second low-frequency inductor (NiG) and the high-frequency inductor (VI), the high-frequency inductor (VI) and the pulling drum to control the technological process of rebar production. measuring the temperature of the moving workpiece or products.

Distinctive features of the proposed line for the production of rebar of a periodic profile are that the line is additionally equipped with two low-frequency inductors and a high-frequency inductor, a water-air sprayer, as well as devices for non-contact measurement of the temperature of the moving workpiece or products.

The technical result is that the proposed line, which contains known and additional devices with their specific location, has increased technological capabilities and due to the use of effects in steel caused by temperature and deformation influences, allows the production of reinforcing bars with a high level of strength and plasticity. as well as different operational properties in the light of modern requirements of the ND.

Due to the presence of these features, the proposed line for the production of rebar of a periodic profile in coils is characterized by increased manufacturability and productivity, reduced energy consumption and ease of maintenance. Also, one of the advantages of the proposed flow line is its versatility: - the possibility of using both raw materials - wire rod in both hot-rolled and heat-strengthened from rolling heating state; - the possibility of obtaining a different complex of operational properties of rolled steel reinforcement, including an increase in this complex of resistance to cyclic loads and fire resistance.

The specified versatility is achieved by introducing into the line of heating devices of accelerated (high-speed) heating in the form of inductors with different frequencies of oscillation of the electromagnetic field: low-frequency inductor (NO) - for high-speed heating over the entire cross-section of the processed product; high-frequency inductor (VI) - for high-speed surface heating in the area of a periodic profile, as well as a water-air sprayer and devices for non-contact temperature measurement of moving workpieces or products.

All of the listed additional devices ensure the production on this line of rebar, which is characterized by a high level of strength and plastic properties, as well as corrosion resistance, fire resistance, increased resistance to cyclic loading.

The proposed line is explained by the drawing. The scheme of the line for the production of rebar of a periodic profile in coils is shown, which includes, placed in the technological sequence, an unwinding device 1, a scale removal device 2, a device for applying lubricant 3, an active deformation device in the form of a block of roller sheaves 4, a cyclic deformation device 5, a traction drum 6 and a device for forming coils 7. The line additionally contains the first low-frequency inductor (NI) 8, which is located in front of the active deformation device 4, as well as the second low-frequency inductor (Nig) 9 and the high-frequency inductor (VI) 10, which are located after the cyclic deformation device . A water-air sprayer 11 is placed between the active deformation device and the cyclic deformation device. After the first low-frequency inductor (NI), after the water-air sprayer, after the second low-frequency inductor (Nig) and after the high-frequency inductor (VI) are installed

From the device 12 for contactless measurement of the temperature of the moving workpiece or products.

The first low-frequency inductor (No:) 8 is designed to change the deformation temperature, both active (AD) and cyclic (CD). It technologically allows changing the temperature of the moving workpiece: a) for deformation in the temperature range of dynamic deformation aging (DDS) at 200-400 C; b) for deformation in the temperature range of warm deformation (450-600 "С); c) for deformation in the range of cold deformation (HD) at ambient temperature (without heating in NI, due to its exclusion).

The second low-frequency inductor (NiIg) 9 - is intended for tempering - high-temperature deformation aging (DS) after ADACD.

The high-frequency inductor VI 10 is designed for additional tempering of the surface layer of the rebar after heating it in the low-frequency inductor Ni 9, which increases corrosion resistance and "Sezdefect" winding of high-strength reinforcement into a skein.

To ensure the possibility of performing cyclic deformation (CD) in the area of cold deformation (CD) after the device of active deformation (AD) and in front of the device of cyclic deformation (CD), a water-air sprayer 11 is located, designed for uniformity of cooling and achieving sufficient intensity of cooling with a small flow of water or water-air mixture, with a rotating cooling chamber. A similar sprayer can be located in front of the pulling drum 6 or in front of the device for forming skeins 7.

However, in this case, his appointment will not carry technological aspects, but will only contribute to the improvement of the working conditions of the service personnel.

Control of heating devices is carried out by adjusting the supplied power depending on the specified parameters: the final heating temperature, the length of the inductor, the speed of movement of the workpiece (product) and the mass of the area being heated. The actual temperature of the moving workpiece (product) is monitored using 12 non-contact temperature measurement devices (photopyrometers) installed in certain places of the line. In the same way, the intensity of cooling of the heated workpiece (product) in the sprayer is controlled.

The operation of the proposed line is carried out as follows. The skeins of the raw material - wire rod (according to DSTU 2770 or according to another ND) are installed on the unwinding device 1. Several turns of the wire rod are aligned and fed into the line through the scale removal device 2, the device for applying lubricant 3, the first low-frequency inductor (NiI:) 8, active deformation device 4, water-air sprayer 11, cyclic deformation device 5, second low-frequency inductor (Nig) 9 and high-frequency inductor (VI) 10. Pulling the wire rod with the help of a traction drum b through an active deformation device in the form of a block of roller sheaves 4 leads to the formation on the surface of reinforcing bars of a periodic profile of a certain configuration in accordance with ND. Next, the products are sent to the device for forming skeins 7, where they are assembled into heavy-duty skeins weighing 1-5 tons.

Depending on the tasks for the production of rebar with certain operational properties, the line can work according to several dozen technological options when using both its individual devices and the entire composition of additional equipment. Some examples.

Option 1. For the production of reinforcing steel with increased corrosion resistance (for construction in coastal zones and areas with a humid climate), it is sufficient to use only a high-frequency inductor (VI) in the proposed line 10. Production of products with final heating of a surface layer with a thickness of 0.3-0.5 mm to temperatures of 700-750 "С will ensure the formation of a favorable equilibrium structure with increased corrosion resistance.

Option 2. For the production of reinforcing bars with a high level of plasticity (for construction in seismically active zones), it is sufficient to use only the second low-frequency inductor (Nig) in the proposed line. 9. The production of products with finish heating along the entire cross-section to temperatures of 400-500 "C will allow tempering and realize the effect of high-temperature deformation aging, which will lead to a significant increase in plastic properties while maintaining strength.

Option 3. For the production of rebar with high resistance, cyclic load and fire resistance, it is necessary to use the entire composition of the main equipment of the line - the first low-frequency inductor (Ni) 8, the active deformation device 4, the water-air sprayer 11, the cyclic deformation device 5, the second low-frequency inductor (Nig ) 9 of the high-frequency inductor (VI) 10. Production of products by heating the workpiece to temperatures of 450-600"С in NI: 8, further active deformation in

From device 4, cooling in sprayer 11, cyclic deformation in device 5, heating in (Nig) 9 across the entire section to temperatures of 400-500 C and finishing heating in VI 10 of the surface layer 0.3-0.5 mm thick to temperatures of 700 -750 "С will ensure the formation of a structure with high resistance to cyclic loading and fire resistance.

The use of the proposed line makes it possible to increase the manufacturability of the process of manufacturing rebar of a periodic profile in coils, ensures the production of rebar with a strength class of 500...800 MPa, which has a high level of plastic properties, corrosion resistance, fire resistance, increased resistance to cyclic loads and is intended for welded meshes, use as reinforcing elements of monolithic and prefabricated reinforced concrete structures, as well as for reinforcing highway foundations and airfield coatings. In addition, the use of the obtained products in the following transformations (in construction) reduces metal consumption in the production of reinforced concrete structures by 10-25 95, provides the opportunity to produce long-dimensional reinforced concrete products (crossbars, road slabs, etc.) of unlimited length.

Claims (2)

FORMULA OF THE INVENTION 1. A line for the production of rebar from smooth round wire, which contains an unwinding device, a scale removal device, a device for applying lubricant, an active deformation device in the form of a block of roller sheaves, a cyclic deformation device, a traction drum and a forming device placed in a technological sequence coils, which differs in that the first low-frequency inductor (Ni) is located in front of the active deformation device, and the second low-frequency inductor (Nig) and high-frequency inductor (VI) are located behind the cyclic deformation device. 2. The line according to claim 1, which differs in that a water-air sprayer is additionally placed between the active deformation device and the cyclic deformation device. Z. The line according to claim 2, which differs in that between the first low-frequency inductor (NIiI.) and the active deformation device, the water-air sprayer and the cyclic deformation device, the second low-frequency inductor (Nig) and the high-frequency inductor (VI), the high-frequency inductor (VI) and a traction drum, devices for non-contact measurement of the temperature of the moving workpiece or products are installed. and 2 From the 12th 125 12 1565 to her NO | district of Kho pyky DI a A IN NO M ia zha 7 X ; ri N nonano vo navan E nn nn ih i A that SSZ NINE kiy MANNYA Y olova o VOVNY vn ZAVANNNNNYNY i iy NIKY MU m shki i V PO ON write she dr ni all vil yuyu 6 po what bodio vi