CN112692054A - Bar steel rolling and splitting process capable of reducing raw material cost - Google Patents
Bar steel rolling and splitting process capable of reducing raw material cost Download PDFInfo
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- CN112692054A CN112692054A CN202011294393.3A CN202011294393A CN112692054A CN 112692054 A CN112692054 A CN 112692054A CN 202011294393 A CN202011294393 A CN 202011294393A CN 112692054 A CN112692054 A CN 112692054A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
- B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
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Abstract
The invention discloses a bar steel rolling and splitting process capable of reducing the cost of raw materials, which comprises the following steps: preparing a steel bar to be cut, heating the steel bar by a heating furnace, and processing the steel bar by a roughing mill set; then the blanks enter a middle rolling mill set after being cut by a No. 1 flying shear, a preset rectangle is obtained by two-pass horizontal and vertical rolling, then the blanks enter pre-cutting and cutting passes, and then several groups of separated blanks after being cut respectively enter a water passing pipe of a rolling control water tank for temperature control; and then, cutting heads by a No. 2 flying shear, and simultaneously feeding a plurality of groups of cut steel materials into a finishing mill group for rolling for 2-4 times to form a finished product. The invention can most effectively avoid the adverse effect of the controlled rolling cooling low-temperature steel on the splitting times, simultaneously meet the requirements that the steel rolling capacity is not influenced, realize the controlled rolling and controlled cooling to refine the internal structure crystal grains of the finished product, avoid the approach of improving the physical property of a high alloying blank, and really achieve the final aim of reducing the alloy ratio and the cost of raw materials.
Description
Technical Field
The invention relates to the technical field of bar steel rolling segmentation, in particular to a bar steel rolling segmentation process capable of reducing the cost of raw materials.
Background
At present, the splitting rolling process adopted in the domestic bar production is mature and common, the main layout is almost the full continuous rolling consisting of a rough rolling unit → a medium rolling unit → a finish rolling unit, the splitting passes are realized and completed in the finish rolling unit, then the cooling control water penetration is carried out after the finished product rack, the similar process design can meet the rolling requirement of low-component alloy (low silicon manganese) by means of the cooling control strong water penetration under the standard of the old national standard (GB1499.2-2007), but the standard requirement can not be met by means of the strong water penetration after the implementation of the new national standard (GB1499.2-2018), the strong water penetration can not avoid tempering to generate martensite after rolling, and thus most splitting lines can only go along two ways: firstly, alloy in a blank is improved to meet rolling requirements, the other approach is to reduce the temperature by controlled rolling in the rolling process to refine grains, the controlled rolling and temperature reduction of most of the existing processes is segmentation rolling, the temperature reduction of the middle pass controlled rolling has obvious effect when being reduced to below 900 ℃, the temperature reduction brings about surface and core, edge and middle temperature nonuniformity firstly, and then temperature reduction brings about disastrous consequences to the pass, because the pass of segmentation has 'saw-tooth-shaped' wedge points, low-temperature steel inevitably aggravates abrasion and even breaks by jumping edges, the pass is not durable, the product has the problems of surface quality and the like, rolling is difficult to continue, a small number of enterprises adopt the two-line segmentation experiment in large scale, but the controlled rolling temperature is above 900 ℃, and how to realize the perfect combination of segmentation and controlled rolling is always a difficult problem in the steel rolling industry.
Because the finished product metallographic phase has strict requirements after the new national standard is implemented, in the past, after the method of forced water penetration and cooling control after slitting and rolling is adopted, enterprises currently produce HRB400E and 500E by improving the silicon-manganese alloy and adding vanadium-nitrogen alloy to meet the requirements, but heavy cost burden of the enterprises is increased, the method is unfavorable in strong market competition, whether a new technology which can meet the requirements of a slitting rolling technology and can control rolling, cool and refine the finished product crystal grains is found is the core design idea of the invention, if the rolling temperature is reduced by 100 ℃ in the middle of rolling, the silicon-manganese alloy can be respectively reduced by 0.1 percent on the existing basis, the economic benefit is very large, and even if the power consumption is increased by 3-5 kwh/t in the rolling process, the design of the similar new technology has wide prospects.
Therefore, a new layout design of a bar splitting process rolling mill is provided, which not only meets the requirement of controlled rolling low temperature, but also meets the requirement of reducing the influence on splitting times to zero.
Disclosure of Invention
The technical task of the invention is to provide a bar steel rolling splitting process capable of reducing the cost of raw materials, wherein the mode that the conventional splitting pass finishes rolling into the bar in a finishing mill set is replaced by the mode that the conventional splitting pass finishes rolling into the bar in a middle mill set before controlled rolling and cooling, and the designed splitting rolling has the obvious advantages of improving the yield, reducing the total rolling pass and reducing the consumption; the adverse effect of controlled rolling and cooling low-temperature steel on the splitting pass can be effectively avoided, the condition that the steel rolling capacity is not influenced and the controlled rolling and cooling can be realized to refine the internal structure crystal grains of the finished product is met, the approach of improving the physical property without a higher alloying blank is not needed, and the final aim of reducing the alloy ratio and the cost of raw materials is really achieved; and a group of straightening mechanisms are arranged in front of the No. 2 flying shear, and one end of the steel material is straightened after the steel material is sheared by the straightening mechanisms, so that the end part of the steel material is prevented from being bent and wound, and the problems are solved.
The technical scheme of the invention is realized as follows:
a steel bar rolling and splitting process capable of reducing raw material cost comprises the following steps:
s1, preparing a steel bar to be cut, preheating the steel bar through a drying channel at 200 ℃, conveying the bar into a heating furnace, setting heating temperature and time parameters, heating the bar through the heating furnace, arranging the heating furnace to be a side-in side-out double-heat-storage stepping heating furnace, detecting the temperature, conveying the steel bar to a roughing mill to process after the surface of the steel bar to be detected is heated to a preset temperature range;
s2, after finishing the processing of the rough mill set, entering a middle mill set after cutting the head through a No. 1 flying shear, and obtaining a preset rectangle through two-pass vertical rolling;
s3, immediately entering pre-splitting and splitting passes, then entering the split groups of blanks into a rolling control water tank water pipe for cooling → core part temperature returning → re-cooling → re-temperature returning, and cooling and returning for multiple times to ensure uniform temperature of the surface and the inside of the steel;
s4, cutting the head through 2# flying shears;
the 2# flying shear comprises a conveying frame, a sliding seat is slidably mounted on the conveying frame, a screw rod mechanism and a servo motor used for driving the screw rod mechanism are mounted on one side of the conveying frame, a screw rod nut of the screw rod mechanism is fixedly mounted on the bottom surface of the sliding seat, a coder is further mounted on the conveying frame, the coder is connected with a servo controller of the servo motor through a lead, a flying shear mechanism is mounted on the sliding seat, and a straightening mechanism is fixedly mounted at the front section of the conveying frame, which is positioned on the flying shear mechanism;
the straightening mechanism comprises a sliding rod fixedly connected to a conveying frame, a sliding frame is slidably mounted on the sliding rod, a heat conducting frame is fixedly connected to the sliding frame, a linear bearing is rotatably mounted on the heat conducting frame, the outer ring of the linear bearing is rotatably mounted on the heat conducting frame through a ball bearing, gears which are meshed with each other are fixedly sleeved on the outer ring of the linear bearing, a reduction gearbox is fixedly connected to one end of the sliding frame, a speed reduction motor is mounted on one side of the reduction gearbox, the speed reduction gear of the reduction gearbox is meshed with the gears, a hydraulic cylinder is fixedly mounted on the conveying frame, and one end of the hydraulic cylinder is fixedly connected to one side of the sliding frame;
during specific work, after the steel material is conveyed to an internal shearing opening of the No. 2 flying shear, the steel material reaches a specified shearing position, the conveying speed of the steel material is detected by an encoder in the conveying process, the conveying speed is fed back to a servo controller of a servo motor, then the servo motor is controlled to rotate, so that the No. 2 flying shear is kept consistent with the conveying speed of the steel material, and then the No. 2 flying shear is controlled to shear; after shearing, the No. 2 flying shear is automatically opened, the speed reduction motor is started and the hydraulic cylinder is controlled to rapidly extend at the moment, the extension speed of the hydraulic cylinder is 5-10 times of the conveying speed of the steel material, the end part of the steel material is straightened by utilizing a linear bearing rolling straightening mode in the extension process to avoid bending, and then the hydraulic cylinder is retracted to the original position;
and S5, simultaneously feeding multiple groups of cut steel materials into a finishing mill group to be rolled for 2-4 times to form a finished product, cooling the finished product by a cooling water tank, feeding the cooled finished product into a 3# double-length flying shear to be sheared, and collecting the sheared finished product to finish the steel rolling and splitting processing of the bar.
Preferably, in S1, the temperature of the steel bar after being heated is 1030 ℃ and 1150 ℃; after the S3 temperature reduction and temperature return are completed, the temperature of the steel material is kept at 850-900 ℃; in order to keep the temperature of the steel material uniform, the length of the cooling section of the rolling control water tank in S3 is required to be not less than 60 meters.
Preferably, the controlled rolling cooling section is added in the process, and when the finish rolling is carried out, the temperature is 100 ℃ lower than that of uncontrolled rolling cooling, and the power of the motor of the finish rolling mill is increased by 10-20%, so that the load capacity of the motor of the finish rolling mill in the improved process needs to be increased by 20-30% on the original basis.
Preferably, the screw rod mechanism comprises a screw rod, a screw nut is installed on the screw rod in a threaded mode, supporting bearings are installed at two ends of the screw rod, and the supporting bearings are fixedly installed on one side of the conveying frame.
Preferably, a heat dissipation air port is formed in one side of the reduction gearbox, and heat dissipation fan blades are mounted on one group of transmission shafts in the reduction gearbox, which are aligned with the heat dissipation air port.
Preferably, the heat conducting frame is a high-temperature-resistant steel frame, a circulating heat dissipation pipeline is arranged on the heat conducting frame, a circulating water inlet and a circulating water outlet are respectively arranged at two ends of the circulating heat dissipation pipeline, and the circulating water inlet is communicated with the circulating cooling water tank through a water pipe and a water pump; the middle end part of the circulating heat dissipation pipeline is connected through a communicating hose, and the outer side of the circulating heat dissipation pipeline is fixedly connected with copper heat dissipation fins.
Preferably, one end of the linear bearing extends out of the sliding frame by at least 5-10cm, one end of the linear bearing is fixedly connected with a high-hardness steel sleeve, and an inner ring opening at one end of the steel sleeve is provided with a conical chamfer opening.
Preferably, the conveying frame is further provided with a guide wheel, the guide wheel is provided with a guide groove, and steel materials pass through the guide groove during machining.
Preferably, the linear bearing is replaced by a sleeve, and an integrally-structured circular arc-shaped protrusion is fixedly connected to the inner wall of the sleeve.
Preferably, in the circulating heat radiation pipeline, circulating oil can be used as a heat radiation medium for heat conduction and heat radiation due to high temperature.
Compared with the prior art, the invention has the advantages and positive effects that:
1. the invention is mainly characterized in that the conventional splitting pass is finished in a finishing mill group to be rolled into a finished product, and the conventional splitting pass is finished in a middle mill group before controlled rolling and cooling, and the splitting rolling with the design has the obvious advantages of improving the yield, reducing the total rolling pass and reducing the consumption.
2. The invention is characterized in that a rolled piece enters controlled rolling cooling after being segmented in a controlled rolling water cooling front and middle rolling mill set, and a 2# flying shear cuts the head and the tail into a finish rolling final rolling finished product, thereby most effectively avoiding the adverse effect of controlled rolling cooling low-temperature steel on the segmentation pass, simultaneously satisfying the requirements that the steel rolling capacity is not influenced, realizing controlled rolling and controlled cooling to refine the internal structure crystal grains of the finished product, improving the physical property path without high alloying blank, and really achieving the final target of reducing the alloy ratio and reducing the raw material cost; in addition, after the splitting is finished by the medium rolling, the rolled piece has a large section, is easy to adjust, and has small influence after the splitting line difference is rolled by multiple times.
3. According to the invention, a group of straightening mechanisms are arranged in front of the No. 2 flying shear, and one end of a steel material is straightened after the steel material is sheared by the straightening mechanisms, so that the end part of the steel material is prevented from being bent and wound; the straightening mechanism is convenient for guiding to continue the next step process, and the straightening mechanism is simple in structure and easy to realize.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of the overall flow structure of a steel bar rolling and splitting process according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a # 2 flying shear according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a straightening mechanism according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an internal side view of a thermally conductive frame according to an embodiment of the invention;
FIG. 5 is a schematic illustration of the construction of a steel casing according to an embodiment of the invention;
FIG. 6 is a schematic structural diagram of a heat dissipation channel according to an embodiment of the invention;
fig. 7 is a schematic structural view of a screw mechanism according to an embodiment of the present invention;
fig. 8 is a partial structural schematic view of the interior of the reduction gearbox according to an embodiment of the invention.
In the figure:
1. a roughing mill train; 2. 1# flying shear; 3. a medium mill group; 4. a rolling control water tank; 5. 2# flying shear; 6. a finishing mill group; 7. a cold water control tank; 8. 3# double-length flying shears;
11. a transfer frame; 12. a slide base; 13. a flying shear mechanism; 14. a straightening mechanism; 15. a guide wheel; 16. a guide groove; 17. steel materials; 18. an encoder; 19. a servo motor; 20. a screw mechanism; 2001. a screw rod; 2002. a feed screw nut; 2003. a support bearing;
1401. a carriage; 1402. a heat conducting frame; 1403. a linear bearing; 1404. a slide bar; 1405. a circulating water inlet; 1406. a circulating water outlet; 1407. a gear; 1408. a hydraulic cylinder; 1409. a reduction gear; 1410. a reduction motor; 1411. a reduction gearbox; 1412. a heat dissipation air port; 1413. a heat dissipation fan blade; 1414. a heat dissipation pipe; 1415. a ball bearing; 1416. steel jacket; 1417. a tapered chamfer mouth; 1418. a communication hose; 1419. and (4) radiating fins.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
The invention is further described with reference to the following figures and specific examples.
Example 1
As shown in fig. 1 to 8, a process for cutting a rolled bar according to an embodiment of the present invention includes the following steps:
s1, preparing a steel bar to be cut, preheating the steel bar through a drying channel at 200 ℃ with 150-;
s2, after finishing the processing of the roughing mill group 1, cutting the ends by a No. 1 flying shear 2, entering a middle mill group 3, and obtaining a preset rectangle by performing horizontal and vertical rolling for two times;
s3, immediately entering pre-splitting and splitting passes, then entering the split groups of blanks into a water penetrating pipe of the rolling control water tank 4 for cooling → core part temperature returning → re-cooling → re-temperature returning, and cooling and returning for multiple times to ensure uniform temperature of the exterior and interior of the steel material 17;
s4, cutting the head through a No. 2 flying shear 5;
the 2# flying shear 5 comprises a conveying frame 11, a sliding seat 12 is slidably mounted on the conveying frame 11, a screw rod mechanism 20 and a servo motor 19 for driving the screw rod mechanism 20 are mounted on one side of the conveying frame 11, a screw rod nut 2002 of the screw rod mechanism 20 is fixedly mounted on the bottom surface of the sliding seat 12, an encoder 18 is further mounted on the conveying frame 11, the encoder 18 is connected with a servo controller of the servo motor 19 through a lead, a flying shear mechanism 13 is mounted on the sliding seat 12, and a straightening mechanism 14 is fixedly mounted on the conveying frame 11 and positioned at the front section of the flying shear mechanism 13;
the straightening mechanism 14 comprises a sliding rod 1404 fixedly connected to the transmission frame 11, a sliding frame 1401 is slidably mounted on the sliding rod 1404, a heat conduction frame 1402 is fixedly connected to the sliding frame 1401, a linear bearing 1403 is rotatably mounted on the heat conduction frame 1402, the outer ring of the linear bearing 1403 is rotatably mounted on the heat conduction frame 1402 through a ball bearing 1415, gears 1407 which are mutually meshed are fixedly sleeved on the outer ring of the linear bearing 1403, one end of the sliding frame 1401 is also fixedly connected with a reduction gearbox 1411, a speed reduction motor 1410 is mounted on one side of the reduction gearbox 1411, a speed reduction gear 1409 of the reduction gearbox 1411 is meshed with the gears 1407, a hydraulic cylinder 1408 is fixedly mounted on the transmission frame 11, and one end of the hydraulic cylinder 1408 is fixedly connected to one side;
during specific work, after the steel material 17 is conveyed to the inner shearing opening of the 2# flying shear 5 and reaches a specified shearing position, the conveying speed of the steel material 17 is detected by the encoder 18 in the conveying process, the conveying speed is fed back to the servo controller of the servo motor 19, then the servo motor 19 is controlled to rotate, so that the conveying speed of the 2# flying shear 5 is kept consistent with that of the steel material 17, and then the 2# flying shear 5 is controlled to shear; after shearing, the # 2 flying shear automatically opens, the speed reduction motor 1410 is started and the hydraulic cylinder 1408 is controlled to rapidly extend, the extension speed of the hydraulic cylinder 1408 is 5-10 times of the transmission speed of the steel material 17, the end of the steel material 17 is straightened by utilizing a linear bearing 1403 rolling straightening mode in the extension process to avoid bending, and then the hydraulic cylinder 1408 is retracted to the original position;
and S5, simultaneously feeding multiple groups of cut steel materials into a finishing mill unit 6 for rolling for 2-4 times to form a finished product, cooling the finished product by a cooling water tank 7, feeding the cooled finished product into a 3# double-length flying shear 8 for shearing, and collecting the sheared finished product to finish the steel rolling and cutting processing of the bar.
By adopting the technical scheme, the mode that the conventional splitting pass is rolled into the finished product in the finishing mill unit 6 is replaced by the mode that the conventional splitting pass is rolled into the finished product in the middle mill unit 3 before controlled rolling and cooling, and the splitting rolling with the design has the remarkable advantages of improving the yield, reducing the total rolling pass and reducing the consumption.
In S1, the temperature of the steel bar after being heated is 1030 ℃ and 1150 ℃; after the S3 temperature reduction and temperature return are completed, the temperature of the steel material 17 is kept at 850-900 ℃; in order to keep the temperature of the steel material 17 uniform, the length of the cooling section of the rolling water control box 4 in the S3 is required to be not less than 60 meters.
By adopting the technical scheme, the length of the cooling section of the rolling water control tank 4 is longer, and the temperature control is convenient.
The process is added with a controlled rolling cooling section, and when the process enters the finish rolling, the temperature is 100 ℃ lower than that of the uncontrolled rolling cooling, and the power of the motor of the finish rolling mill is increased by 10-20%, so that the load capacity of the motor of the finish rolling mill in the improved process needs to be improved by 20-30% on the original basis.
By adopting the technical scheme, although the power consumption is increased after improvement and the load cost of the motor is increased, the cost is increased far less than the saved cost, and therefore, the improvement effect is remarkable.
As shown in fig. 7, the screw mechanism 20 includes a screw 2001, a screw nut 2002 is threadedly mounted on the screw 2001, support bearings 2003 are mounted at both ends of the screw 2001, and the support bearings 2003 are fixedly mounted at one side of the transport frame 11.
By adopting the technical scheme, the relative speed is controlled by utilizing the screw rod mechanism 20 and the servo motor 19, the synchronism of the speed is kept better, and the shearing is convenient.
As shown in fig. 8, a heat dissipation air port 1412 is formed at one side of the reduction gearbox 1411, and heat dissipation blades 1413 are mounted on one group of transmission shafts in the reduction gearbox 1411 aligned with the heat dissipation air port 1412.
By adopting the technical scheme, since the straightening mechanism 14 works in a high-temperature environment, in order to avoid the influence of high temperature on the speed reduction motor 1410, the reduction gearbox 1411 needs to be continuously cooled, so that high temperature is avoided.
Specifically, the heat conduction frame 1402 is a high-temperature-resistant steel frame, a circulating heat dissipation pipeline 1414 is arranged on the heat conduction frame 1402, a circulating water inlet 1405 and a circulating water outlet 1406 are respectively arranged at two ends of the circulating heat dissipation pipeline 1414, and the circulating water inlet 1405 is communicated with the circulating cooling water tank through a water pipe and a water pump; as shown in fig. 6, the middle end of the circulating heat radiation pipe 1414 is connected by a communication hose 1418, and a copper heat radiation fin 1419 is fixedly connected to the outer side of the circulating heat radiation pipe 1414.
By adopting the technical scheme, the circulating heat dissipation pipeline 1414 is utilized to play a good cooling effect, the ball bearing 1415 and the linear bearing 1403 are protected, and the service life of the linear bearing is prevented from being influenced by higher temperature.
One end of the linear bearing 1403 extends out of the sliding frame 1401 by at least 5-10cm, one end of the linear bearing 1403 is fixedly connected with a high-hardness steel sleeve 1416, and as shown in fig. 5, an inner ring opening part at one end of the steel sleeve 1416 is provided with a conical chamfer opening 1417.
By adopting the technical scheme, the tapered chamfer port 1417 is convenient for straightening.
In fig. 1, a guide wheel 15 is further arranged on the conveying frame 11, a guide groove 16 is formed in the guide wheel 15, and during machining, a steel material 17 passes through the guide groove 16.
By adopting the technical scheme, the steel material 17 is convenient to separate and advance in parallel through the matching of the guide wheel 15 and the guide groove 16.
In the circulating heat radiation pipeline 1414, circulating oil can also be used as a heat radiation medium for heat conduction and heat radiation due to high temperature.
By adopting the technical scheme, the heat absorption capacity of the circulating oil is higher, the circulating oil can not be boiled, and the circulating oil has higher safety in a higher temperature environment than water.
Example 2
Unlike embodiment 1, the linear bearing 1403 is replaced with a sleeve, and a circular arc protrusion of an integrated structure is fixedly connected to the inner wall of the sleeve.
By adopting the technical scheme, the sleeve is utilized, so that the cost is lower, and the maintenance is convenient.
For the convenience of understanding the technical solutions of the present invention, the following detailed description will be made on the working principle or the operation mode of the present invention in the practical process.
In actual use, the straightening mechanism 14 is quickly pushed out by the hydraulic cylinder 1408, so that one end of the linear bearing 1403 quickly advances on the steel 17 toward one end of the cut steel 17 and quickly rotates during the advance, thereby providing a straightening effect on the bent steel 17.
In the implementation, the inner diameter of the linear bearing 1403 or the sleeve is at least 1-2mm larger than the maximum diameter of the steel material 17, the center of the steel material 17 is located at the center of the linear bearing 1403 (the sleeve), and in the circulating heat dissipation pipeline, because the temperature is high, circulating oil can be used as a heat dissipation medium to conduct heat conduction and heat dissipation.
The main characteristic of the invention is that the conventional cutting pass is finished in the finishing mill group 6 to be rolled into the finished product, and the conventional cutting pass is finished in the middle mill group 3 before the controlled rolling and cooling, and the cutting rolling with the design has the obvious advantages of improving the yield, reducing the total rolling pass and reducing the consumption. The invention arranges the splitting gate to the middle rolling mill group 3 to finish, each group of red blanks after splitting respectively enters a controlled rolling cooler to be cooled, after the temperature is restored to be uniform outside and inside by a section of temperature, the red blanks enter a finish rolling mill to be finished products after being split by a flying shear, the finish rolling pass can adopt an ellipse-circle system mode, and a plurality of lines of red blanks after splitting simultaneously enter the mill to be rolled, the mode of completing splitting of the splitting gate before controlled rolling cooling can effectively avoid the influence of the controlled rolling low-temperature steel on splitting, and simultaneously meets the rolling deformation requirement under the low-temperature condition to realize grain refinement. A group of straightening mechanisms 14 are arranged in front of a No. 2 flying shear 5, and one end of a steel material is straightened by utilizing the straightening mechanisms 14 after shearing, so that the end part of the steel material 17 is prevented from being bent and wound; straightening is convenient for guiding to continue the next step process, and the straightening mechanism 14 is simple in structure and easy to realize.
The present invention can be easily implemented by those skilled in the art from the above detailed description. It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. On the basis of the disclosed embodiments, a person skilled in the art can combine different technical features at will, thereby implementing different technical solutions.
Claims (10)
1. A steel bar rolling and splitting process capable of reducing raw material cost is characterized by comprising the following steps:
s1, preparing a steel bar to be cut, preheating the steel bar through a drying channel at 200 ℃ with 150-;
s2, after finishing the processing of the rough mill set (1), cutting the ends by a No. 1 flying shear (2), entering a middle mill set (3), and obtaining a preset rectangle by flat-vertical rolling for two times;
s3, immediately entering pre-splitting and splitting passes, then respectively entering the split groups of blanks into a water passing pipe of a rolling control water tank (4) for cooling → core part temperature returning → re-cooling → re-temperature returning, and cooling and returning for multiple times to ensure uniform temperature of the surface and the inside of the steel material (17);
s4, cutting the head through a 2# flying shear (5);
the 2# flying shear (5) comprises a conveying frame (11), a sliding seat (12) is slidably mounted on the conveying frame (11), a screw rod mechanism (20) and a servo motor (19) used for driving the screw rod mechanism (20) are mounted on one side of the conveying frame (11), a screw rod nut (2002) of the screw rod mechanism (20) is fixedly mounted on the bottom surface of the sliding seat (12), an encoder (18) is further mounted on the conveying frame (11), the encoder (18) is connected with a servo controller of the servo motor (19) through a lead, a flying shear mechanism (13) is mounted on the sliding seat (12), and a straightening mechanism (14) is fixedly mounted on the conveying frame (11) and located at the front section of the flying shear mechanism (13);
the straightening mechanism (14) comprises a slide bar (1404) fixedly connected with the transmission frame (11), a sliding frame (1401) is arranged on the sliding rod (1404) in a sliding way, a heat conducting frame (1402) is fixedly connected onto the sliding frame (1401), a linear bearing (1403) is rotatably mounted on the heat conduction frame (1402), the outer ring of the linear bearing (1403) is rotatably mounted on the heat conduction frame (1402) through a ball bearing (1415), the outer ring of the linear bearing (1403) is also fixedly sleeved with gears (1407) which are meshed with each other, one end of the sliding frame (1401) is also fixedly connected with a reduction gearbox (1411), one side of the reduction gearbox (1411) is provided with a reduction motor (1410), a reduction gear (1409) of the reduction gearbox (1411) is in meshed connection with the gear (1407), a hydraulic cylinder (1408) is fixedly arranged on the transmission frame (11), and one end of the hydraulic cylinder (1408) is fixedly connected to one side of the sliding frame (1401);
during specific work, after the steel material (17) is conveyed to an internal shearing opening of the 2# flying shear (5), the steel material reaches a specified shearing position, the conveying speed of the steel material (17) is detected through the encoder (18) in the conveying process, the conveying speed is fed back to a servo controller of the servo motor (19), then the servo motor (19) is controlled to rotate, so that the conveying speed of the 2# flying shear (5) is kept consistent with that of the steel material (17), and then the 2# flying shear (5) is controlled to shear; after shearing, the No. 2 flying shear automatically opens, the speed reduction motor (1410) is started and the hydraulic cylinder (1408) is controlled to rapidly extend, the extension speed of the hydraulic cylinder (1408) is 5-10 times of the transmission speed of the steel material (17), the end of the steel material (17) is straightened in the extension process by utilizing a rolling straightening mode of a linear bearing (1403), bending is avoided, and then the hydraulic cylinder (1408) retracts to the original position;
and S5, simultaneously feeding multiple groups of cut steel materials into a finishing mill group (6) for rolling for 2-4 times to form a finished product, cooling the finished product by a cooling water tank (7), feeding the cooled finished product into a 3# double-length flying shear (8) for shearing, and collecting the cut finished product until the cut of the steel bars is finished.
2. The process of claim 1, wherein in step S1, the temperature of the heated steel bar is 1030-1150 ℃; after the temperature reduction and temperature return of S3 are completed, the temperature of the steel material (17) is kept at 850-900 ℃; in order to keep the temperature of the steel material (17) uniform, the length of the cooling section of the rolling water control box (4) in the S3 is required to be not less than 60 meters.
3. The process of claim 1, wherein a controlled rolling cooling section is added, and when the process is finish rolling, the temperature is 100 ℃ lower than that of uncontrolled rolling cooling, and the power of the motor of the finishing mill is increased by 10-20%, so that the load capacity of the motor of the finishing mill in the improved process needs to be increased by 20-30% on the original basis.
4. The process for rolling and splitting a bar according to claim 1, wherein the screw mechanism (20) comprises a screw (2001), the screw nut (2002) is threadedly mounted on the screw (2001), the two ends of the screw (2001) are provided with support bearings (2003), and the support bearings (2003) are fixedly mounted on one side of the conveying frame (11).
5. The process for rolling and cutting bars and steel bars according to claim 1, wherein a heat dissipation air port (1412) is formed in one side of the reduction gearbox (1411), and heat dissipation fan blades (1413) are mounted on one group of transmission shafts in the reduction gearbox (1411) and aligned with the heat dissipation air port (1412).
6. The process for cutting and rolling steel bars according to claim 1, wherein the heat conduction frame (1402) is a high temperature resistant steel frame, a circulating heat dissipation pipeline (1414) is arranged on the heat conduction frame (1402), a circulating water inlet (1405) and a circulating water outlet (1406) are respectively arranged at two ends of the circulating heat dissipation pipeline (1414), and the circulating water inlet (1405) is communicated with a circulating cooling water tank through a water pipe and a water pump; the middle end part of the circulating heat dissipation pipeline (1414) is connected through a communication hose (1418), and a copper heat dissipation fin (1419) is fixedly connected to the outer side of the circulating heat dissipation pipeline (1414).
7. The process for rolling and splitting the bar material according to claim 1, wherein one end of the linear bearing (1403) extends out of the sliding frame (1401) by at least 5-10cm, one end of the linear bearing (1403) is fixedly connected with a high-hardness steel sleeve (1416), and an inner ring opening at one end of the steel sleeve (1416) is provided with a conical chamfer opening (1417).
8. The process for rolling and splitting the bar according to claim 7, wherein the conveying frame (11) is further provided with a guide wheel (15), the guide wheel (15) is provided with a guide groove (16), and the steel material (17) passes through the guide groove (16) during the processing.
9. The process for rolling and cutting bars and steel bars according to claim 7, characterized in that the linear bearing (1403) is replaced by a sleeve, on the inner wall of which the circular arc shaped protrusions of an integrated structure are fixedly connected.
10. The process for rolling and splitting a bar according to claim 1, wherein the circulating heat dissipation pipeline (1414) can also use circulating oil as a heat dissipation medium to conduct heat conduction and heat dissipation due to high temperature.
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