CN106180191A - A kind of wire and rod continuous casting billet is exempted to heat and is directly rolled system and method - Google Patents

Abstract

The invention provides a heating-free direct rolling system and method for continuous casting slabs of wire and rod, which includes a continuous casting machine, a rapid hydraulic shear, a post-cutting roller table, a slab flow converging roller table, a transport hot-feeding roller table and Wire and bar rolling mill; the slab flow converging roller table gathers the slab on each stream to the conveying hot delivery roller table, and a set is provided between the cut-off roller table and the slab flow converging roller table to prevent the slab from entering and release gate mechanism. The continuous casting machine of the invention has the advantages of high-efficiency continuous casting, high casting billet drawing temperature, regular shape, small temperature loss, rapid casting billet shearing, and high casting billet initial temperature. Through the gate mechanism, the sheared slabs enter the high-speed slab flow converging roller table sequentially, which is easy to operate and easy to organize production. The temperature at the entrance of the slab to the rolling mill is high, so it can be rolled directly without heating, and the damage to the rolling mill is small.

Description

A heating-free direct rolling system and method for continuous casting slabs of wire and rod

technical field

The invention belongs to the technical field of metal continuous casting and rolling, and in particular relates to a heating-free direct rolling system and method for continuous casting billets of wire and rod.

Background technique

At present, the production process of wire and bar is mostly: the molten steel is cooled and solidified by the continuous casting crystallizer and the secondary cooling section, and then straightened by the drawing and leveling machine to pull out the cast slab, and the cast slab is cut to length by flame and then conveyed by the cutting roller table and The roller table is sent to the blanking area. The casting slabs that need to be hot-sent are sent to the hot-sending roller table through the steel turning machine, steel transfer machine, and steel separator, and are directly sent to the rolling steel into the heating furnace; Send it to the steel turning cooling bed for cooling, and then the slab collection platform is collected by the crane and stacked off the assembly line. The temperature of the slab sent to the steel rolling heating furnace is generally in the range of 500-600°C. The slab at this temperature cannot be rolled directly. It needs to be reheated to 1040-1140°C in the heating furnace before rolling. The off-line cast slabs are generally stored and naturally cooled to room temperature, and then sent to rolling steel to be heated in a heating furnace and then rolled. The defect of this production process is that: the high-temperature casting slab is cooled due to the long follow-up process, and reheating causes a lot of energy consumption. Even if it is hot charging and hot delivery, it still needs to be heated, which also consumes a lot of energy; the construction of the steel rolling heating furnace Investment, daily maintenance, material consumption, etc. will also consume huge economic input and production costs, and increase carbon emissions.

In order to avoid the occurrence of the above phenomenon, adopting the direct rolling technology is a very safe and flexible measure. The core of the direct rolling technology is: the billet is rolled directly without the heating furnace, the rolling start temperature is between conventional rolling and low temperature rolling, the final rolling temperature is not much different from the conventional rolling temperature, fast transportation, lifting The temperature from the casting slab to the rolling mill shortens the time from the continuous casting machine to the rolling mill to ensure that the starting temperature of the rolling mill is within a reasonable range.

The continuous casting slab is cut and sent to the rolling mill at high speed. The slab has not been heated, and its surface temperature is lower than the conventional rolling start temperature, but the center temperature of the slab is much higher than the surface temperature, which is easy to deform and penetrate deeply. The pressing and elimination of the internal defects of the billet, the outward diffusion of the internal high temperature area in the rough rolling stage, produce a uniform temperature effect, increase the surface temperature, and promote the improvement of the internal quality.

The Chinese patent with the application number 201020160403.X discloses a flexible connection device for endless rolling of profiles and bars. According to the patent, it provides three types of flexible connection devices: one is made of soft pressing rollers One is composed of a large reduction rolling mill; the other is composed of the above-mentioned soft reduction roll system and a large reduction rolling mill, and one of the three forms is selected to be installed between the crystallizer and the conventional rolling mill. In this patent, a reduction device is set between the continuous casting machine and the rolling mill, and the section size of the slab is gradually compressed to increase the speed from the slab to the rolled steel, so as to realize the seamless connection and flexible connection between the continuous casting and the rolled steel, shortening the process and line length. Since there is no slab cutting process in this technology, generally only single-strand production can be realized. For wire and bar production, the output of a single-strand production line is too low. If multi-strand production is adopted, each stream must be equipped with a corresponding rolling unit, which will cause problems such as excessive investment and inconvenient on-site production organization and management.

The Chinese patent with the application number 201010185485.8 discloses a continuous casting and rolling method for producing profiles and bars by utilizing the waste heat of molten steel. Cutting or coiling, cooling, finishing bales to storage. The invention overcomes the problems of energy waste, multiple head cutting, all reheating and one short ruler in each section existing in the prior art, and saves energy and reduces loss. However, this technology is more suitable for single-strand or double-strand continuous casting machines. For multi-strand continuous casting machines, the number of rolling mill units will be very large, and it is not easy to operate and organize production management.

The Chinese patent application with the application number 201310475792.3 discloses a method for producing long profiles by direct rolling. According to the patent, the method includes continuous casting machine, billet roller table, thermal insulation transition stand, induction heating device and rolling mill and other equipment . Although this invention improves the original way of heating the continuous casting billet in the furnace during the production process of long profiles, there are still problems such as high investment in equipment, large power consumption in production, combustion, and oxidation loss when using induction heating.

The Chinese patent application number 201220380196.8 discloses a continuous casting and rolling device for producing long products. According to the patent, the device includes a continuous casting machine, a roller hearth heating furnace is closely connected to the cutting machine, and a traverse device And a rolling mill capable of low temperature rolling. Although the invention patent changes the traditional heating furnace into a roller hearth heating furnace, it can only heat the lower surface of the slab, which can easily cause the temperature of the slab to be uneven. Therefore, it is necessary to build a supplementary heating furnace, which increases the process and increases Large equipment investment and energy consumption.

The Chinese patent application number 201320582646.6 discloses a device for producing steel bars by directly rolling billets at low temperature without heating. The end of the billet roller table is equipped with a blending device that can adjust the billets horizontally. On the side opposite to the billet roller table, there are several rolling lines. The billet roller table and the conveying roller table are equipped with heat preservation covers. Although the patent cancels the heating furnace, the device uses multiple rows of continuous casting slabs in parallel. After the steel is divided by the horizontal allocation device, a single flow is sent to the hot delivery roller table, which will cause the continuous casting slabs entering the hot delivery roller table to wait. The temperature is lowered in the process of time, and the cooling time of the continuous casting slab is also increased due to the need to traverse the steel. Essentially, this device is not fundamentally different from the currently commonly used hot-feeding and hot-charging technology, and the temperature drop of the continuous casting slab is too large to meet the rolling requirements of the rolling mill.

The Chinese patent application number 201420728124.7 discloses a continuous casting-direct rolling device for producing rods, wires and profiles. According to the patent, it provides a continuous casting-rolling device, including a continuous casting machine, a casting Billet cutting device and roller table after cutting, fast heat preservation roller table and steel rolling production line. The width of the roller table of the fast heat preservation roller table is gradually reduced from the continuous casting machine to the steel rolling production line to accommodate a single slab to pass through. There are multiple hot metal detectors and pyrometers on the roller table, and the heat preservation device is set on the fast heat insulation roller. In front of the road or in front of the steel rolling line. Although this patent adopts a stepwise billet discharge method, cancels the traditional heating furnace, and adopts a multi-flow and single-flow connecting roller table and adopts heat preservation measures, it does not affect the casting speed and secondary cooling of the continuous casting machine itself. The control is improved, and there is no requirement for the cutting of the slab or the shearing time, because the place where the slab is cut is the starting temperature of the slab for direct rolling without heating. If the starting temperature of the slab is not high, then the Do not apply heat-free direct rolling (the surface temperature of the rolling slab > 850 ℃). In addition, the premise of the step-by-step billet discharge method is that the continuous casting must be stable and forward, and the casting billets can only be sent out sequentially by controlling the casting speed in the middle. Such an operation is very difficult and not easy to produce on site.

Contents of the invention

In view of the deficiencies of the prior art described above, the purpose of the present invention is to provide a heating-free direct rolling system for continuous casting of wire and rod, which can maximize the temperature when the slab is cut, and shorten the time from continuous casting to rolling of the slab. time to reduce the temperature loss of the slab during transportation.

In order to achieve the above-mentioned purpose and other related purposes, the technical solution of the present invention is as follows:

A heating-free direct rolling system for continuous casting billets of wire and rods, comprising a continuous casting machine, a rapid hydraulic shear, a roller table after cutting, a roller table for converging billets, a conveying hot delivery roller table, and a wire and rod rolling mill arranged closely in sequence; The slab stream converging roller table converges the slab on each stream to the conveying hot delivery roller table.

With the above structure, the continuous casting machine adopts a small-radius high-speed casting machine, which has the characteristics of small radius, short metallurgical length, and high casting speed. Usually, the radius is less than 9m; a fast hydraulic pressure is installed closely downstream of the small-radius high-speed casting machine. Shearing minimizes the distance between the tension leveler and the fast hydraulic shear, and increases the temperature of the slab when it is sheared; the fast hydraulic shear cuts the continuous casting slab synchronously online, which is fast and convenient, with fast shearing speed, high shearing success rate and low equipment failure rate , The regular shearing cut does not affect the rolling of the slab. The conventional flame cutting takes one or two minutes, but the fast hydraulic shearing only takes a few seconds, which shortens the shearing time and reduces the temperature drop. At the same time, in the area of the roller table after cutting, the slabs are also lined up with multiple strands and converged to the slab flow converging roller table, which can slow down the temperature of the slabs, reduce the temperature loss, and ensure the temperature during subsequent rolling.

Further, the billet flow converging roller table is in the shape of a trumpet with a wide upstream and a narrow downstream. The casting slabs on each flow can be converged on the conveying hot roller table at high speed, and the casting slabs can be gathered at high speed without slipping or jamming.

Further, a gate mechanism for blocking the entry and release of the slab is provided between the post-cutting roller table and the slab flow converging roller table.

Furthermore, when the gate is raised, it can prevent the slab from entering the slab flow converging roller table, and when it is lowered, the slab in the flow is allowed to enter the slab flow converging roller table, so as to play the role of orderly adjustment of the slab transportation.

Further, the gate mechanism is a lifting baffle driven by hydraulic pressure or pneumatic pressure.

Furthermore, the radius of the continuous casting machine is 6m-9m.

Further, the casting speed of the continuous casting machine is greater than 3.5m/min; the post-cutting roller table and the conveying hot delivery roller table are variable frequency or non-frequency variable roller tables.

Further, the high-speed continuous casting machine is equipped with a cooling spray device, including a spray mechanism and a water inlet main pipe as a fixed bracket. On the main pipe, it is connected with the water inlet pipe; the water inlet pipe is divided into several sections along the arc direction of the casting stream, and the section arrangement is convenient for replacement and maintenance; each section is provided with water inlets at the upper and lower ends. Each section is a spray area, and each area adopts the method of passing water through the upper and lower water inlets at the same time to avoid uneven distribution of cooling water up and down.

With the above-mentioned structure, the damage to the bracket is small when the continuous casting machine has steel leakage and other accidents, and it does not affect the reorganization of production of the continuous casting machine.

Further, the spraying mechanism is a nozzle ring group, the plane where the nozzle ring group is located is perpendicular to the casting strand, and the casting strand passes through the middle of the nozzle ring group, the nozzle ring group is connected to the main water inlet through a connecting pipe, and the nozzle ring Multiple nozzles are mounted on the group.

Further, the nozzle ring group has an octagonal structure, including 4 long pipes and 4 short pipes connected alternately. The long pipes near the inner arc side are connected to the water inlet main pipe through the connecting pipe, and the nozzles are installed on the short pipes. superior.

Furthermore, the included angle between the short tube and the long tube is 120°.

Further, the nozzle ring group is an octagonal structure composed of 8 nozzles of equal length, the nozzles are installed on the nozzles at intervals, and the nozzles are connected to the water inlet main pipe through a connecting pipe.

Further, the nozzle is threadedly connected to the nozzle ring set, and the connecting pipe is inserted into the water inlet main pipe and the nozzle ring set.

The structure is simple, the nozzle ring group is easy to install and disassemble, the components are integrated and highly integrated, and the rapid replacement of the nozzle is realized.

Further, the hole diameter of the nozzle is greater than or equal to 2mm. It is suitable for a wide range of water quality, not easy to be blocked, the nozzle atomization effect is good, and the spraying speed is fast.

The present invention also provides a heating-free direct rolling method for continuous casting slabs of wire and rod. The above-mentioned heating-free direct rolling system for continuous casting slabs of wire and rods is adopted, and the casting slabs produced by the continuous casting machine are cut by rapid hydraulic shearing. It is sent from the cut roller table to the slab flow converging roller table, and a gate mechanism is set between the slab flow converging roller table and the cut roller table, and the slabs are released according to the order in which they arrive, and the slabs pass through the slab flow converging roller table The high speed is converged to the hot conveying roller table, and the billet is quickly transported to the rolling mill in a single stream by the hot conveying roller table for heat-free rolling.

Further, the radius of the continuous casting machine is 6m-9m; the casting speed is greater than 3.5m/min; the temperature of the slab before cutting is controlled by the secondary cooling system of the continuous casting machine to be greater than 980°C, and the high-temperature slab after shearing undergoes high-speed convergence and During the delivery to the steel rolling process, the temperature loss is controlled within the range of less than 50°C. The conveying time is shortened by high casting speed and high-speed roller table, and the temperature drop is reduced; the cast slabs are conveyed in groups after the billet roller table, which can also reduce temperature loss and ensure rolling quality.

The high casting speed continuous casting machine is equipped with a high casting speed crystallizer, the casting speed is greater than 3.5m/min, and is equipped with an efficient secondary cooling system to ensure that the temperature of the billet before cutting is greater than 980°C, the shape of the billet is regular, and the surface quality is excellent. The high-speed casting mold has a low-resistance cavity structure, high-efficiency cooling water slots, and a unique corner structure of the copper tube to ensure uniform cooling of the slab in the mold and the thickness of the shell of the slab out of the mold. The high-efficiency secondary cooling system has an optimized design of the secondary cooling section and nozzle layout, and an efficient secondary cooling water distribution system to ensure uniform cooling of the slab and the temperature when the slab exits the secondary cooling airtight chamber. Minimize the distance between the tension leveler and the fast hydraulic shear, and increase the temperature when the slab is sheared.

As mentioned above, the beneficial effects of the present invention are:

Small-radius high-speed continuous casting machine for high-efficiency continuous casting, high billet drawing temperature, regular shape, small temperature loss, fast shearing of billet, and high initial temperature of billet. The high-temperature continuous casting slabs are quickly cut after leaving the tension leveling machine, and the slabs on different streams are converged to the hot-feeding roller table at high speed and transported to the rolling workshop at high speed. The slabs are directly rolled without heating. The drop is extremely small, the operation is simple, and the production is easy to organize. The rolled steel slab arrives at a high temperature, so it can be rolled directly without heating, and the damage to the rolling mill is small. The invention maximizes the temperature when the slab is cut, shortens the time from continuous casting to rolling of the slab to the greatest extent, reduces the temperature and heat loss of the slab during transportation to the greatest extent, and makes full use of continuous casting Billet metallurgical heat energy greatly reduces the energy consumption of casting billets in the transportation process, improves the finished product rate, saves metal consumption, shortens the production cycle, simplifies the production process, reduces the workshop area and transportation equipment, and saves production costs and infrastructure investment , Improved product quality. Through the cooling spray device, it avoids the problem of uneven water spray volume of nozzles on the traditional billet secondary cooling spray bar, and prevents the damage to the spray system caused by steel breakout accidents; the nozzle ring group is convenient and quick to disassemble , accurate positioning, greatly saving maintenance time, improving the labor intensity of maintenance operators; maximally improving the operating rate of the billet continuous casting machine, uniform cooling of the billet, improving the quality of the billet, and providing high-speed casting for the billet Guaranteed to achieve high efficiency and high yield.

Description of drawings

Fig. 1 is the top view of the arrangement structure of the high-speed direct-feeding direct-rolling system of the continuous casting billet of wire and rod of the present invention;

Fig. 2 is the front view of the arrangement structure of the high-speed direct-feeding direct-rolling system for the continuous casting billet of wire and rod of the present invention;

Fig. 3 is the structural representation of cooling spray device of the present invention;

Fig. 4 is the structural representation of the nozzle ring group of the present invention;

Fig. 5 is another structural schematic diagram of the nozzle ring set of the present invention.

Part number description

1 Small radius high casting speed continuous casting machine

2 fast hydraulic shears

3 roller table after cutting

4 gate mechanism

5 High-speed slab flow converging roller table

6 High-speed transport hot roller table

7-wire bar mill

11 Strand

12 Inlet supervisor

13 nozzle ring set

131 long tube

132 short tube

133 Nozzles

134 nozzle

14 connecting tube

15 water inlet

detailed description

The implementation of the present invention will be illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

Example

As shown in Figure 1 and Figure 2, a heating-free direct rolling system for continuous casting of wire and rod is mainly used in the production process of wire and rod, including small-radius high-speed continuous casting machines 1, Rapid hydraulic shear 2, post-cutting roller table 3, high-speed slab flow converging roller table 5, high-speed transport hot-feeding roller table 6, and wire and bar rolling mill 7; There is a gate mechanism 4 for blocking the entry and release of the slab. When the gate is raised, it can prevent the slab from entering the high-speed slab flow converging roller table 5. When it is lowered, the slab in the current flow is released to enter the slab flow converging roller table. The role of orderly regulation of slab transportation. After the slab is pulled out at a high speed, the high-temperature slab is cut to a certain length and enters the post-cutting roller table 3, and the gate mechanism 4 sequentially releases the slab to enter the high-speed slab flow converging roller table 5 according to the first-come-first-served principle. The billets are gathered at high speed on the high-speed conveying hot roller table 6 and transported to the wire and bar mill 7 for heat-free rolling.

Among them, the small-radius high-speed continuous casting machine 1 has a radius of 6m-9m; it is equipped with a high-speed casting mold, and the casting speed is greater than 3.5m/min. The high-speed casting mold has a low-resistance cavity structure, high-efficiency cooling water slots, and a unique corner structure of the copper tube to ensure uniform cooling of the slab in the mold and the thickness of the shell of the slab out of the mold. Equipped with a cooling system to ensure that the temperature of the slab before cutting is greater than 980°C, the shape of the slab is regular, and the surface quality is excellent. Install fast hydraulic shears 2 closely downstream of small-radius high-speed casting machine 1, minimize the distance between the tension leveler and fast hydraulic shears 2, and increase the temperature when the slab is sheared; fast hydraulic shears 2 online synchronous shear continuous casting billet, fast and convenient, fast shearing speed, high shearing success rate, low equipment failure rate, regular shearing incision does not affect casting billet rolling, conventional flame cutting takes one or two minutes, while fast hydraulic shear 2 only takes a few seconds , shorten the shearing time and reduce the temperature drop.

Wherein the post-cut roller table 3 is a high-speed roller table, adopts frequency conversion or non-frequency conversion, and can send the slab to the high-speed slab flow converging roller table 5 at high speed. The 5 sets of high-speed slab converging roller tables are installed in horns, gradually narrowing from upstream to downstream, and can gather the slabs on each flow to the high-speed transportation hot delivery roller table 6 at high speed, so that the slabs converge at high speed without slipping or stuck. The high-speed transport hot-feeding roller table 6 is a high-speed roller table, which can adopt frequency conversion or non-frequency conversion. After the billet enters the roller table, the billet is transported to the rolling workshop at high speed for rolling.

In the area of the roller table 3 after cutting, multiple billets are arranged together, and there are many billets in the process of feeding the billets into the high-speed billet flow converging roller table 5 and on the high-speed billet flow converging roller table 5. The roots are grouped, which can slow down the cooling of the slab, reduce the temperature loss, and ensure the temperature of the subsequent rolling.

In this example, the gate mechanism 4 is preferably a lifting baffle driven by hydraulic pressure or air pressure, which is convenient for remote operation and control. Among them, the post-cutting roller table 3, the high-speed slab flow converging roller table 5, and the high-speed transport hot-feeding roller table 6 are all high-speed roller tables, and the speed can be controlled at 30-100m/min.

The present invention is based on increasing the casting speed and increasing the temperature of the slab exiting the continuous casting machine; the high-temperature slab after shearing is gathered and transported at a high speed and sent to rolling, and the temperature loss in the whole process is controlled within the range of less than 50°C.

As further shown in Figures 3 and 4, the small-radius high-speed continuous casting machine 1 is provided with a cooling spray device, which includes a spray mechanism and a water inlet main pipe 12. In this example, the water inlet main pipe 12 serves as a fixed bracket at the same time The key to supporting the spraying mechanism is that the water inlet main pipe 12 is located on the inner arc side of the casting stream 11, and the spraying mechanism is used for secondary cooling of the slab, which is installed on the water inlet main pipe 12 and communicated with the water inlet main pipe 12 .

Since the water inlet main pipe 12 is located on the inner arc side, the damage to the water inlet main pipe 12 is small when accidents such as steel leakage occur in the continuous casting machine, which does not affect the reorganization of production of the continuous casting machine, and is easy to install and disassemble. Capable of cooling and not easily deformed.

Further, the water inlet main pipe 12 is divided into multiple sections along the arc direction of the casting strand 11, and each water inlet main pipe 12 section is provided with water inlets 15 at both upper and lower ends. Arranged in sections, when a problem occurs in a certain section, it is convenient for a single section to be removed for maintenance or replacement without dismantling or replacing the entire mechanism. Each segment is a spraying area, and each area adopts the mode of passing water through the upper and lower water inlets 15 at the same time, so as to avoid uneven distribution of cooling water up and down.

As further shown in Figure 4, the spray mechanism is a nozzle ring group 13, the plane where the nozzle ring group 13 is located is perpendicular to the casting strand 11, the nozzle ring group 13 is distributed from dense to thin along the strand flow direction, and the casting strand 11 is formed by the nozzle ring group 13 passes through the middle, and multiple nozzles 133 are installed on the nozzle ring group 13. The nozzle ring group 13 has an octagonal structure, including four long tubes 131 and four short tubes 122 connected alternately, and two tubes near the inner arc side The long pipe 131 is connected to the water inlet main pipe 12 through a Y-shaped connecting pipe 14, and the connecting pipe 14 is divided into two channels to communicate with the long pipe 131 to ensure the uniformity of the water outlet. The nozzle 133 is installed on the short pipe 122, and the short pipe 122 The included angle with the long pipe 131 is 120°.

As shown in Figure 5, the nozzle ring group can also be composed of eight nozzle pipes 134 of equal length to form a regular octagonal structure. The connecting pipe 14 is also Y-shaped, and is connected to the nozzle pipes 134 in two ways, and the nozzle 133 is installed in it. The four nozzles 134 are arranged at intervals, and the angle between adjacent nozzles 134 is 120°.

Further, in order to facilitate the installation and disassembly of the nozzle ring set 13 , the nozzle 133 is threadedly connected with the nozzle ring set 13 , and the connecting pipe 14 is inserted into the water inlet main pipe 12 and the nozzle ring set 13 . The plug-in connection can adopt the commonly used butt joint method of male and female joints, the structure is simple, the nozzle ring group 13 is easy to install and disassemble, and the components have a high degree of integrity and integration, which realizes the rapid replacement of the nozzle 133 . The hole diameter of the nozzle 133 is greater than or equal to 2 mm. It is suitable for a wide range of water quality and is not easy to be blocked. The nozzle 133 has a good atomization effect and a fast spraying speed.

The above-mentioned spraying device improves the operating rate of the billet continuous casting machine to the greatest extent, and the billet is cooled evenly, which improves the quality of the billet; avoids the unevenness of the nozzle water spray volume on the traditional billet secondary cooling spray bar. and the problem of damage to the sprinkler system caused by steel leakage accidents; the structure is simple, the disassembly and assembly of the nozzle ring group 13 is convenient, fast, and the positioning is accurate, which can greatly save maintenance time and improve the labor intensity of maintenance operators; The water main pipe 12 is fixed on the inner arc side, is not easily deformed, is not affected by steel leakage accidents, and has a longer service life. The fixed bracket comes with water cooling, which is not easy to deform and has a long service life. It provides a guarantee for the high casting speed of the billet and realizes the purpose of high efficiency and high production.

The present invention also provides a heating-free direct rolling method for continuous casting slabs of wire and rod. The above-mentioned heating-free direct rolling system for continuous casting slabs of wire and rods is adopted, and the casting slabs produced by the continuous casting machine are cut by rapid hydraulic shears 2. It is sent from the cut roller table 3 to the slab flow converging roller table, and the gate mechanism 4 is set between the slab flow converging roller table and the cut roller table 3, and the slabs are released according to the order in which they arrive, and the slabs pass through the slab flow The converging roller table converges to the hot conveying roller table at high speed, and the billet is quickly transported to the rolling mill in a single stream by the hot conveying roller table for heating-free rolling.

The small-radius high-speed casting machine 1 has a radius of 6m-9m; it is equipped with a high-speed crystallizer, and the casting speed is greater than 3.5m/min; the temperature before cutting the slab is controlled to be greater than 980°C through the secondary cooling system of the continuous casting machine, The sheared high-temperature slab is gathered and transported at high speed to the steel rolling process, and the temperature loss is controlled within the range of less than 50°C. The conveying time is shortened by high casting speed and high-speed roller table, and the temperature drop is reduced; the cast slabs are conveyed in groups after the billet roller table, which can also reduce temperature loss and ensure rolling quality.

Compared with the prior art, the present invention has the following technical advantages:

1. The small-radius high-speed continuous casting machine has high-efficiency continuous casting, fast casting speed, high casting temperature, regular shape, small temperature loss, fast shearing of casting blank, and high casting blank starting temperature.

2. The sheared slabs are sequentially entered into the high-speed slab flow converging roller table, which is easy to operate and easy to organize production.

3. The temperature at the entrance of the billet to the rolling mill is high, so it can be rolled directly without heating, and the damage to the rolling mill is small.

Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

Claims (10)

1. a wire and rod continuous casting billet is exempted to heat and is directly rolled system, it is characterised in that: the conticaster that includes closely arranging successively, quickly Hydraulic shear, cut rear roller-way, strand stream converges roller-way, transporting hot and send roller-way and wire and bar mill；Described strand stream converges roller-way will Strand on the most first-class converges to transporting hot and send on roller-way.

A kind of wire and rod continuous casting billet the most according to claim 1 is exempted to heat and is directly rolled system, it is characterised in that: described strand stream Converging roller-way is the narrow horn-like shape in width downstream, upstream.

A kind of wire and rod continuous casting billet the most according to claim 1 is exempted to heat and is directly rolled system, it is characterised in that cut back roller described in: Road and strand stream converge and are provided with between roller-way for stopping the gate mechanism that strand enters and lets pass.

A kind of wire and rod continuous casting billet the most according to claim 3 is exempted to heat and is directly rolled system, it is characterised in that: described gate machine Structure is the adjustable end stop using hydraulic pressure or air pressure to drive.

A kind of wire and rod continuous casting billet the most according to claim 1 is exempted to heat and is directly rolled system, it is characterised in that: described conticaster Radius is 6m-9m.

A kind of wire and rod continuous casting billet the most according to claim 1 is exempted to heat and is directly rolled system, it is characterised in that: described conticaster Pulling rate is more than 3.5m/min；Described cut rear roller-way, transporting hot send roller-way to be frequency conversion roller-way.

A kind of wire and rod continuous casting billet the most according to claim 1 is exempted to heat and is directly rolled system, it is characterised in that: described conticaster On be provided with cooling twice spray equipment, including spraying mechanism and as support bracket fastened water inlet supervisor, described water inlet supervisor Being positioned at the inner arc side of casting stream, described spraying mechanism is arranged on water supervisor, and connects with water inlet supervisor；Described water inlet supervisor edge Casting stream arc direction is divided into multiple segmentation, each upper and lower two ends of described segmentation to be provided with water inlet.

A kind of wire and rod continuous casting billet the most according to claim 7 is exempted to heat and is directly rolled system, it is characterised in that: described spray thrower Structure is nozzle ring group, and described nozzle ring group place plane is vertical with casting stream, and casting stream is passed by the middle of nozzle ring group, nozzle ring group On multiple nozzle is installed, described nozzle ring group is eight-sided formation, and described nozzle pitch is arranged on jet pipe, described jet pipe lead to Cross connecting tube to be connected with water inlet supervisor.

9. wire and rod continuous casting billet exempts to heat a straight rolling method, uses a kind of wire and rod described in claim 1-8 any one Continuous casting billet is exempted to heat and is directly rolled system, it is characterised in that: the strand that conticaster is produced after rapid hydraulic cutting cuts by cutting after Roller-way is delivered to strand stream and is converged roller-way, and strand stream converges roller-way and cuts and arrange gate mechanism between rear roller-way, arrives according to strand Sequencing let pass, strand converges roller-way through strand stream and at a high speed converges to transporting hot and send roller-way, and is sent roller by transporting hot Strand single current is fed rapidly into milling train and carries out exempting from heating rolling by road.

A kind of wire and rod continuous casting billet the most according to claim 9 exempts to heat straight rolling method, it is characterised in that: described continuous casting Machine radius is 6m-9m；Pulling rate is more than 3.5m/min；Before controlling strand cutting by conticaster secondary cooling system, temperature is more than 980 DEG C, the high temperature strand after shearing is delivered in the steel rolling operation of rolling through convergence and conveying at a high speed, and temperature loss controls be less than In the range of 50 DEG C.