A method of controlling damage to a high speed rod finishing stand collar

Abstract

The application discloses a method for controlling damage of a high-speed rod product rack roller ring, and relates to the technical field of rod rolling processes, which comprises the following steps: obtaining working parameters of finishing mills in each production stage in a high-speed rod rolling production line; extracting the working parameters of the finishing mills in the finishing stage; and adjusting the working parameters of the finishing mills in the finishing stage to control the damage frequency of the roller ring of the finishing product rack. Through the method, the tension between the rolling pieces in the finishing mill is controlled, the head biting impact of the rolling pieces is controlled, the upper pressing method is adopted for the finishing product rack, and the roller ring cooling water is improved, so that the stability of the steel biting and the cooling effect of the roller ring are controlled, the production accidents caused by the damage of the roller ring of the finishing product rack are reduced, and stable production is realized.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of bar rolling process, and in particular to a method for controlling damage of a high-speed bar finished product rack roll ring. BACKGROUND

[0002] Reinforcing steel bars are a kind of steel products with a large consumption, and the consumption of reinforcing steel bars accounts for about 20% of the total steel consumption. In recent years, the apparent consumption of reinforcing steel bars in China is about 250 million tons, and reinforcing steel bars are major building steel materials. From the economic development of some regions in recent years, the demand for reinforcing steel bars remains stable.

[0003] The current process flow of the high-speed bar production line for producing reinforcing steel bars is as follows: feeding, heating, rough rolling, intermediate rolling, pre-finishing rolling, finishing rolling, high-speed zone, finishing and collecting, and warehousing. The finishing rolling is composed of six main rolling groups to form a finishing rolling group, and the reinforcing steel bars are mainly formed by marking the upper and lower work roll rings of the finishing product rack into flat bean-shaped grooves. When the rolled piece is rolled in the finished product rack, the flat bean-shaped grooves of the upper and lower work roll rings are imprinted on the surface of the rolled piece to form a crescent-shaped rib, which is collectively referred to as a reinforcing steel bar.

[0004] In the production process of the high-speed bar process for producing finished products with specifications of R12-R22 mm, the roll rings of the finishing product rack frequently appear damaged. From the macroscopic morphology, the roll ring damage is manifested in transverse and longitudinal directions, which can easily cause steel stacking accidents and waste products, and seriously affects the production and product quality stability.

[0005] Therefore, it is necessary to propose a method for controlling the damage of the high-speed bar finished product rack roll ring to solve the above problems. SUMMARY

[0006] A series of simplified concepts are introduced in the summary part of the application, which will be further described in detail in the specific embodiment part. The summary part of the application does not mean to try to limit the key features and necessary technical features of the claimed technical solution, and even less means to determine the protection scope of the claimed technical solution.

[0007] The application specifically includes the following aspects:

[0008] In a first aspect, the application provides a method for controlling the damage of a high-speed bar finished product rack roll ring, comprising:

[0009] Obtaining working parameters of finishing mills in each production stage in a high-speed bar rolling production line; wherein the production stages include a heating stage, a rough rolling stage, a medium rolling stage, a pre-finishing rolling stage, a finishing rolling stage, a high-speed bar feeding stage and a finishing stage; 24 finishing mills are arranged in the high-speed bar rolling production line, 6 finishing mills are arranged in the rough rolling stage, 4 finishing mills are arranged in the medium rolling stage, 6 finishing mills are arranged in the pre-finishing rolling stage, and 8 finishing mills are arranged in the finishing rolling stage; the 24 finishing mills arranged in the high-speed bar rolling production line are numbered from 1 to 24 in sequence according to the position sequence of the finishing mills on the production line.

[0010] Extracting the working parameters of the finishing mills in the finishing rolling stage; wherein the finishing rolling stage includes a control of inter-rolling piece finishing mill tension stage, a control of rolling piece head biting impact stage, a control of upper roller ring linear velocity stage and a control of finished product rack roller ring cooling water stage.

[0011] Adjusting the working parameters of the finishing mills in the finishing rolling stage to control the number of roller ring breakage of the finishing product rack.

[0012] In a feasible implementation, adjusting the working parameters of the finishing mills in the finishing rolling stage includes:

[0013] In the control of inter-rolling piece finishing mill tension stage, the tension between different finishing mill groups is set;

[0014] In the control of rolling piece head biting impact stage, the rotating speed of different finishing mills is compensated;

[0015] In the control of upper roller ring linear velocity stage, the diameters of the upper and lower roller rings of the finished product rack are adjusted;

[0016] In the control of finished product rack roller ring cooling water stage, the pressure on the roller ring cooling water pipe is adjusted.

[0017] In a feasible implementation, in the control of inter-rolling piece finishing mill tension stage, the tension between different finishing mill groups is set, including:

[0018] The micro-tension between the 19th and 20th finishing mill racks and the micro-tension between the 21st and 22nd finishing mill racks are set to be 0.5% to 1.0% of the cross-sectional area change of the rolling piece;

[0019] The micro-tension between the 20th and 21st finishing mill racks is set to be 0.3% to 0.5% of the cross-sectional area change of the rolling piece;

[0020] The micro-tension between the 23rd and 24th finishing mill racks is set to be 0.1% to 0.3% of the cross-sectional area change of the rolling piece.

[0021] In a feasible implementation, in the control of the rolling piece head biting impact stage, the rotating speed of the different frame finishing rolling mill is compensated, including:

[0022] When the rolling piece bites in the 19th and 20th finishing rolling mill frame, the rotating speed of the 19th and 20th finishing rolling mill is compensated, the compensation amount is 5-8 revolutions per minute, and the rotating speed compensation lasts for 3 milliseconds;

[0023] When the rolling piece bites in the 21st and 22nd finishing rolling mill frame, the rotating speed of the 21st and 22nd finishing rolling mill is compensated, the compensation amount is 9-12 revolutions per minute, and the rotating speed compensation lasts for 5 milliseconds;

[0024] When the rolling piece bites in the 23rd and 24th finishing rolling mill frame, the rotating speed of the 23rd and 24th finishing rolling mill is compensated, the compensation amount is 13-15 revolutions per minute, and the rotating speed compensation lasts for 8 milliseconds.

[0025] In a feasible implementation, in the control of the rolling piece head biting impact stage, the rotating speed of the different frame finishing rolling mill is compensated, including:

[0026] The upper and lower roller ring diameters of the finished mill frame are adjusted to 0.05-0.08 mm.

[0027] In a feasible implementation, in the control of the rolling piece head biting impact stage, the rotating speed of the different frame finishing rolling mill is compensated, including:

[0028] The pressure on the roller ring cooling water pipe is increased to 9-10 kg.

[0029] In a feasible implementation, the frame working parameters in the finishing rolling stage are adjusted, further including:

[0030] In the control of the finished mill frame roller ring cooling water stage, a Y-type filter is arranged on the water supply pipeline to prevent the nozzle of the cooling water pipe from being blocked.

[0031] In a feasible implementation, a filter screen is arranged on the Y-type filter, and the specification of the filter screen is 40 mesh.

[0032] In a feasible implementation, a pressure gauge is arranged on the roller box body pipe behind the filter to monitor the cooling water pressure through the pressure gauge.

[0033] In a feasible implementation, when the pressure gauge shows that the current pressure loss is greater than the preset value, the filter screen is cleaned.

[0034] In summary, the method for controlling the damage of the high-speed rod product rack roller ring provided in the application solves the problem of the large head of the rolled piece by controlling the tension between the rolling piece and the finishing mill to realize the rolling process without pulling the steel; the impact force of the head of the rolled piece on the roller ring rolling groove is reduced by controlling the linear speed of the roller ring at the moment of the head of the rolled piece biting; the head of the rolled piece is controlled to be raised by appropriately increasing the linear speed of the upper roller ring; and the cooling effect of the product rack roller ring is improved by increasing the cooling water pressure of the roller ring.

[0035] The method for controlling the damage of the high-speed rod product rack roller ring provided in the application, other advantages, objects and features of the application will be embodied in part through the following description, and will be understood by those skilled in the art through the study and practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0036] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present description. Moreover, the same reference numerals in the attached drawings are intended to represent the same components throughout the several drawings. In the drawings:

[0037] Figure 1 A flow chart of a method for controlling the damage of a high-speed rod product rack roller ring is provided for the embodiments of the application;

[0038] Figure 2 A high-speed rod process production flow chart is provided for the embodiments of the application;

[0039] Figure 3 A schematic diagram of a Y-type filter installed on the roller ring cooling water pipe is provided for the embodiments of the application. DETAILED DESCRIPTION

[0040] In order to better understand the technical solutions provided by the embodiments of the present application, the technical solutions of the embodiments of the present application will be described in detail below with the aid of the drawings and specific embodiments. It should be understood that the specific features in the embodiments of the present application and the embodiments are detailed descriptions of the technical solutions of the embodiments of the present application, and are not limitations of the technical solutions of the present application. In the case of no conflict, the technical features in the embodiments of the present application and the embodiments can be combined with each other.

[0041] In this article, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also include elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the statement "comprising a ..." do not exclude the presence of other identical elements in the process, method, article or equipment comprising the elements. The term "two or more" includes two or more than two cases.

[0042] During the production process of the existing high-speed bar production line, the roller rings of the finishing rolling mill stand frequently break, seriously affecting the production and product quality stability.

[0043] Based on the above problems, the present application provides a method for controlling the breakage of the roller rings of the high-speed bar finished product stand. By controlling the tension between the finished product and the finishing rolling, controlling the impact of the biting of the head of the rolled piece, using the upper pressure method for the finished product stand and improving the roller ring cooling water, the purpose of controlling the breakage of the roller rings of the finished product stand is achieved.

[0044] See also Figure 1 , which is a schematic flow chart of a method for controlling the breakage of a high-speed bar product stand roller ring provided in an embodiment of the present application, which may specifically include:

[0045] S110. Obtain the working parameters of the finishing mill in each production stage in the high-speed bar rolling production line; wherein the production stages include a heating stage, a rough rolling stage, an intermediate rolling stage, a pre-finishing rolling stage, a finishing rolling stage, a high-speed steel-making stage and a finishing stage; the high-speed bar rolling production line is provided with 24 finishing mills, the rough rolling stage is provided with 6 finishing mills, the intermediate rolling stage is provided with 4 finishing mills, the pre-finishing rolling stage is provided with 6 finishing mills, and the finishing stage is provided with 8 finishing mills; the 24 finishing mills provided in the high-speed bar rolling production line are numbered from 1 to 24 in sequence according to the position sequence of the finishing mills on the production line.

[0046] For example, Figure 2 As shown, Figure 2 This is a high-speed bar production process flow chart. The high-speed bar production line provided in this application mainly consists of seven major components: a heating furnace, a roughing mill, an intermediate rolling mill, a pre-finishing mill, a finishing mill, a high-speed steel feeding system, and a finishing collection system.

[0047] S120, extracting the finishing mill working parameters in the finishing stage; wherein the finishing stage comprises a controlled rolling piece finishing interpass tension stage, a controlled rolling piece head biting impact stage, a controlled upper roller ring linear velocity stage, and a controlled finished product rack roller ring cooling water stage.

[0048] For example, the controlled rolling piece finishing interpass tension stage sets the micro tension between the finishing mill groups, the controlled rolling piece head biting impact stage compensates the speed of the biting steel, the controlled upper roller ring linear velocity stage adjusts the diameters of the upper and lower roller rings of the finished product rack, and the controlled finished product rack roller ring cooling water stage increases the water pipe pressure.

[0049] S130, adjusting the finishing mill working parameters in the finishing stage to control the number of roller ring breakages of the finished product rack.

[0050] In some examples, adjusting the finishing mill working parameters in the finishing stage comprises:

[0051] In the controlled rolling piece finishing interpass tension stage, the tension between different finishing mill groups is set;

[0052] In the controlled rolling piece head biting impact stage, the speed of different finishing mill groups is compensated;

[0053] In the controlled upper roller ring linear velocity stage, the diameters of the upper and lower roller rings of the finished product rack are adjusted;

[0054] In the controlled finished product rack roller ring cooling water stage, the pressure on the roller ring cooling water pipe is adjusted.

[0055] For example, the controlled rolling piece finishing interpass tension stage realizes no-pulling steel in the rolling process, solves the problem of the large rolling piece head, the controlled rolling piece head biting impact stage reduces the impact force of the rolling piece head on the roller ring groove by controlling the linear velocity of the roller ring at the biting moment, the controlled upper roller ring linear velocity stage controls the rolling piece head upwarp by appropriately increasing the linear velocity of the upper roller ring, and the controlled finished product rack roller ring cooling water stage improves the cooling effect of the finished product rack roller ring by increasing the roller ring cooling water pressure.

[0056] In some examples, in the controlled rolling piece finishing interpass tension stage, the tension between different finishing mill groups is set, comprising:

[0057] The micro tension between the 19th and 20th finishing mill groups and the micro tension between the 21st and 22nd finishing mill groups are set to 0.5% to 1.0% of the cross-sectional area change of the rolling piece;

[0058] The micro tension between the 20th and 21st finishing mill groups is set to 0.3% to 0.5% of the cross-sectional area change of the rolling piece;

[0059] The micro tension between the 23rd and 24th finishing mill groups is set to 0.1% to 0.3% of the cross-sectional area change of the rolling piece.

[0060] For example, the tension between different stands of finishing rolling mill is set when the rolling piece is in the finishing rolling stage. Specifically, the micro tension between the 19th and 20th finishing rolling stands and between the 21st and 22nd finishing rolling stands is set to be 0.5% to 1.0% of the cross-sectional area change of the rolling piece; the micro tension between the 20th and 21st finishing rolling stands is set to be 0.3% to 0.5% of the cross-sectional area change of the rolling piece; and the micro tension between the 23rd and 24th finishing rolling stands is set to be 0.1% to 0.3% of the cross-sectional area change of the rolling piece.

[0061] In some examples, the rotating speed of the finishing rolling mill of different stands is compensated in the stage of controlling the head biting impact of the rolling piece, including:

[0062] When the rolling piece bites into the 19th and 20th finishing rolling stands, the rotating speed of the 19th and 20th finishing rolling mills is compensated by 5 to 8 revolutions per minute, and the rotating speed compensation lasts for 3 milliseconds;

[0063] When the rolling piece bites into the 21st and 22nd finishing rolling stands, the rotating speed of the 21st and 22nd finishing rolling mills is compensated by 9 to 12 revolutions per minute, and the rotating speed compensation lasts for 5 milliseconds;

[0064] When the rolling piece bites into the 23rd and 24th finishing rolling stands, the rotating speed of the 23rd and 24th finishing rolling mills is compensated by 13 to 15 revolutions per minute, and the rotating speed compensation lasts for 8 milliseconds.

[0065] For example, the rotating speed of the finishing rolling mill of different stands is compensated in the stage of controlling the head biting impact of the rolling piece. Specifically, when the rolling piece bites into the 19th and 20th finishing rolling stands, the rotating speed of the two stands is compensated by 5 to 8 revolutions per minute (rpm), and the rotating speed compensation lasts for 3 milliseconds (ms). When the rolling piece bites into the 21st and 22nd finishing rolling stands, the rotating speed compensation is 9 to 12 rpm, and the time is 5 ms. When the rolling piece bites into the 23rd and 24th finishing rolling stands, the rotating speed compensation is 13 to 15 rpm, and the time is 8 ms.

[0066] In some examples, the diameters of the upper and lower roller rings of the finishing rolling mill are adjusted in the stage of controlling the linear speed of the upper roller ring, including:

[0067] The diameter difference between the upper and lower roller rings of the finishing rolling mill is adjusted to be between 0.05 millimeters and 0.08 millimeters.

[0068] For example, when controlling the linear speed of the upper roll ring of the rolling mill, the diameter of the roll ring used by the upper roll of the finishing stand (the last rolling stand) is 0.05mm to 0.08mm larger than the diameter of the roll ring of the lower roll. Due to the difference in the diameters of the roll rings, the linear speed of the upper roll is 0.157m / s to 0.251m / s higher than the linear speed of the lower roll at the same rotational speed. This difference in the diameters of the roll rings is used to control the upward bending of the head of the rolled piece to ensure that the quality and shape of the rolled product meet the requirements.

[0069] In some examples, during the control of the roll ring cooling water stage of the finishing stand, the pressure on the roll ring cooling water pipe is adjusted, including:

[0070] The pressure on the roll ring cooling water pipe is increased to 9 to 10kg.

[0071] For example, during the control of the roll ring cooling water stage of the finishing stand, the flow area of the water supply pipe is increased by increasing the water pipe pressure on the roll ring cooling water pipe to 9 to 10kg. Under normal circumstances, if the intermediate pipe has a reduced diameter, it will cause a loss of pressure and flow. By increasing the pressure, the present application reduces the pressure and flow loss caused by the reduced diameter of the intermediate pipe, thereby improving the heat exchange effect of the roll ring, allowing the roll ring to dissipate heat better, and ensuring the stability of the production process and the quality of the product.

[0072] In some examples, the adjustment of the working parameters of the stands in the finishing stage also includes:

[0073] During the control of the roll ring cooling water stage of the finishing stand, a Y-type filter is installed on the water supply pipe to prevent the nozzles of the cooling water pipe from being blocked.

[0074] For example, it is found during production that individual nozzles of the cooling water pipe are often blocked by iron filings, plastic cloth and other slag. The blockage of the nozzles by these slag will cause uneven cooling of the roll groove, resulting in cracks in the roll ring and affecting the service life of the roll ring and the quality of the product, as shown in Figure 3 The present application solves this problem by installing a Y-type filter (i.e. Figure 3 a hand valve DN50) on the water supply pipe.

[0075] In some examples, a filter screen is provided on the Y-type filter, and the specification of the filter screen is 40 mesh.

[0076] For example, the filter screen of the Y-type filter is selected to be 40 mesh (the size of the screen hole is 0.425mm). This can reduce the probability of nozzle blockage caused by impurities in the water, because the 40 mesh filter screen can filter most of the particulate matter, while not causing a large pressure loss, ensuring the normal supply of cooling water and the cooling effect of the roll ring.

[0077] In some examples, a pressure gauge is arranged on the roll box body pipe behind the filter to monitor the cooling water pressure through the pressure gauge.

[0078] Exemplarily, a pointer pressure gauge is arranged on the roll box body pipe behind the filter to monitor the cooling water pressure.

[0079] In some examples, when the pressure gauge shows that the current pressure loss is greater than the preset value, the filter screen is cleaned.

[0080] Exemplarily, if the pressure loss is greater than 1 bar, the filter screen is cleaned, effectively solving the problem of nozzle blockage and ensuring the uniformity of the roll ring cooling.

[0081] In summary, the method for controlling the damage of the roll ring of the high-speed bar finished product rack provided in the application sets the tension between different finishing mill groups in the control rolling piece finish rolling stage. Since the finishing mill group has a small size section and a high speed, if the tension between the finishing mill groups exists when the steel is rolled, the head of the rolling piece is larger than the target size, the impact of the large size on the roll ring of the group is larger, the finished product rack has a crescent groove, and the stress concentration point of the roll ring and the impact of the rolling piece are superimposed to cause the surface fatigue and shedding of the roll ring. The tension between the finishing mill groups needs to be designed in a certain amount. For example, if the micro-tension is too small, the steel will be stacked between the groups, and if the micro-tension is too large, the head of the rolling piece cannot be effectively controlled, and the purpose of reducing the impact of the large rolling piece size on the roll ring cannot be achieved.

[0082] In the control rolling piece head biting impact stage, the speed of the roll ring of different groups of finishing mills is compensated. Since the rolling piece has a certain impact on the roll gap when the head of the rolling piece enters the roll gap, in order to reduce the impact of the head of the rolling piece on the roll ring, the speed of the roll ring is appropriately increased to increase the carrying-in force of the roll ring on the rolling piece. The scientific compensation amount and compensation time of the roll ring speed are the key to controlling the impact of the head of the rolling piece on the roll ring.

[0083] In the control upper roll ring linear speed stage, the diameters of the upper and lower roll rings of the finished product rack are adjusted. Since the head of the rolling piece presents a more obvious tendency to tilt after being rolled by multiple passes in the finishing mill group, the tilted head of the rolling piece enters the roll groove of the roll ring, and it is easy to produce an impact on the upper roll ring that is greater than the impact on the lower roll ring. After continuous production, the damage to the upper roll ring is obviously more than the damage to the lower roll ring. Therefore, the roll ring adopts a positive pressure method, that is, the diameter of the upper roll ring is 0.05-0.08 mm larger than the diameter of the lower roll ring, the linear speed of the upper roll ring is 0.157-0.251 m / s higher than the linear speed of the lower roll ring, and the problem of the tilted head of the rolling piece can be effectively solved.

[0084] The application adjusts the pressure on the roll ring cooling water pipe during the control of the finished product rack roll ring cooling water stage. The roll ring is made of a mixture of tungsten carbide and cobalt, the CW content is generally 60-85%, the higher the carbide content, the better the wear resistance, and at the same time, the crack sensitivity of the rolled piece to the roll ring impact is stronger, but it is not conducive to stable production. The carbide roll ring has excellent wear resistance and can prolong the service life of the roll ring in the machine. However, the heat dissipation effect of the carbide roll ring is poor, and the original design of the roll ring cooling water pressure is 8 kg. Through the test of the pressure gauge installed on the water pipe near the roll ring, the actual water pressure is 5-6.5 kg, and the surface of the broken crescent groove of the finished product roll ring is blue, which shows that the insufficient cooling capacity of the roll ring during service causes the slot to be damaged. The application uses a 14 kg water tank to cool the finished product rack roll ring. Through the test of the pressure gauge installed on the water pipe near the roll ring, the water pressure reaches 9-10 kg, which improves the heat exchange effect of the roll ring. The roll ring cooling water pipe nozzle is provided with 11 nozzles, each nozzle is a 5mm diameter pipe, and the angle is arranged along the circumferential tangent direction of the roll ring. It is found in production that individual nozzles of the cooling water pipe are often blocked by iron filings, plastic cloth and other slag, which is not easy to find in time and is difficult to clean, resulting in uneven cooling of the roll ring rolling groove and cracks. By installing a Y-type filter on the water supply pipe near the machine, a 40-mesh filter screen (screen size: 0.425 mm) is selected to ensure that most particles are filtered without causing large pressure loss, and a pointer pressure gauge is installed on the roll box body pipe after the filter to monitor the cooling water pressure. If the pressure loss is greater than 1 bar, clean the filter screen to effectively solve the nozzle blockage problem and ensure the uniformity of the roll ring cooling.

[0085] The technical solutions of the application will be further described in detail below through specific examples.

[0086] Example 1: finished steel HRB400E, finished product specification 12mm, rolling 8636 tons.

[0087] Step 1, during the tension control of the rolled piece in the finishing rolling room, the micro tension between the finishing rolling units is set: the micro tension between No. 19 and No. 20 finishing rolling racks and the micro tension between No. 21 and No. 22 finishing rolling racks are set to be 0.55% of the cross-sectional area change of the rolled piece, the micro tension between No. 20 and No. 21 finishing rolling racks is set to be 0.3% of the cross-sectional area change of the rolled piece, and the micro tension between No. 23 and No. 24 finishing rolling racks is set to be 0.12% of the cross-sectional area change of the rolled piece.

[0088] Step 2, in the control of the head of the rolling piece bite impact stage, when the rolling piece bites in the 19th and 20th finishing mill stand, the rotating speed of the two rolling mills is compensated, the compensation amount is 5 rpm, and the rotating speed compensation lasts for 3 ms; when the rolling piece bites in the 21st and 22nd finishing mill stand, the rotating speed compensation amount is 9 rpm, and the rotating speed compensation lasts for 5 ms; when the rolling piece bites in the 23rd and 24th finishing mill stand, the rotating speed compensation amount is 13 rpm, and the rotating speed compensation lasts for 8 ms.

[0089] Step 3, in the control of the upper roller ring linear velocity stage, the diameter of the upper roller ring of the finished mill is larger than that of the lower roller ring by 0.05 mm, the linear velocity of the upper roller ring is higher than that of the lower roller ring by 0.158 m / s, and the head of the rolling piece is controlled to be upwarping.

[0090] Step 4, in the control of the pressure of the roller ring cooling water, it is detected that the actual water pressure of the water pipe close to the roller ring is 9.2 kg. A Y-type filter is installed on the water supply pipeline, and the filter screen is selected to be 40 mesh (screen hole size: 0.425 mm).

[0091] Through the above steps, the finished mill changes the roller ring three times in the specific implementation process, the quality is good, and no roller ring damage accident occurs.

[0092] Example two: the finished steel grade is HRB400E, the finished specification is 12 mm, and the rolling amount is 20745 tons.

[0093] Step 1, in the control of the tension between the finished rolling pieces, the micro tension between the finishing mill groups is set: the micro tension between the 19th and 20th finishing mill stands and the 21st and 22nd finishing mill stands is set to be 0.9% of the cross-sectional area change of the rolling piece, the micro tension between the 20th and 21st finishing mill stands is set to be 0.45% of the cross-sectional area change of the rolling piece, and the micro tension between the 23rd and 24th finishing mill stands is set to be 0.25% of the cross-sectional area change of the rolling piece.

[0094] Step 2, in the control of the head of the rolling piece bite impact stage, when the rolling piece bites in the 19th and 20th finishing mill stand, the rotating speed of the two rolling mills is compensated, the compensation amount is 8 rpm, and the rotating speed compensation lasts for 3 ms; when the rolling piece bites in the 21st and 22nd finishing mill stand, the rotating speed compensation amount is 12 rpm, and the rotating speed compensation lasts for 5 ms; when the rolling piece bites in the 23rd and 24th finishing mill stand, the rotating speed compensation amount is 15 rpm, and the rotating speed compensation lasts for 8 ms.

[0095] Step 3, in the control of the upper roller ring linear velocity stage, the diameter of the upper roller ring of the finished mill is larger than that of the lower roller ring by 0.08 mm, the linear velocity of the upper roller ring is higher than that of the lower roller ring by 0.251 m / s, and the head of the rolling piece is controlled to be upwarping.

[0096] Step 4, in terms of controlling the pressure of the roller ring cooling water, it is detected that the actual water pressure of the water pipe close to the roller ring is 9.5 kg. A Y-type filter is installed on the water supply pipe, and the filter screen is selected to be 40 mesh (screen hole size: 0.425 mm).

[0097] Through the above steps, the finished product rack changes the roller ring five times in the specific implementation process, and the quality is good, and no roller ring damage accident occurs.

[0098] Example three: finished product steel grade HRB400E, finished product specification 18 mm, rolling 27051 tons.

[0099] Step 1, in the tension stage of controlling the rolling piece between the finishing mill, the micro tension between the finishing mill set: the 19th and 20th finishing mill and the 21st and 22nd finishing mill are empty, the 20th and 21st finishing mill are empty, and the micro tension between the 23rd and 24th finishing mill is set to be 0.2% of the cross-sectional area change of the rolling piece.

[0100] Step 2, in the control of the head biting impact stage of the rolling piece, when the rolling piece bites into the 19th and 20th finishing mill, the speed of the two rolling mills is compensated, the compensation amount is 7 rpm, and the speed compensation lasts for 3 ms; when the rolling piece bites into the 21st and 22nd finishing mill, the speed compensation amount is 10 rpm, and the speed compensation lasts for 5 ms; when the rolling piece bites into the 23rd and 24th finishing mill, the speed compensation amount is 15 rpm, and the speed compensation lasts for 8 ms.

[0101] Step 3, in the control of the linear speed of the upper roller ring stage, the diameter of the upper roller ring of the finished product rack is 0.06 mm larger than that of the lower roller ring, the linear speed of the upper roller ring is 0.189 m / s higher than that of the lower roller ring, and the head of the rolling piece is controlled to be upturned.

[0102] Step 4, in terms of controlling the pressure of the roller ring cooling water, it is detected that the actual water pressure of the water pipe close to the roller ring is 9.0 kg. A Y-type filter is installed on the water supply pipe, and the filter screen is selected to be 40 mesh (screen hole size: 0.425 mm).

[0103] Through the above steps, the finished product rack changes the roller ring five times in the specific implementation process, and the quality is good, and no roller ring damage accident occurs.

[0104] Example four: finished product steel grade HRB400E, finished product specification 18 mm, rolling 19031 tons.

[0105] Step 1, in the tension stage of controlling the rolling piece between the finishing mill, the micro tension between the finishing mill set: the 19th and 20th finishing mill and the 21st and 22nd finishing mill are empty, the 20th and 21st finishing mill are empty, and the micro tension between the 23rd and 24th finishing mill is set to be 0.2% of the cross-sectional area change of the rolling piece.

[0106] Step 2, in the control of the head of the rolling piece bite impact stage, when the rolling piece bites in the 19th and 20th finishing mill stand, the rotating speed of the two rolling mills is compensated, the compensation amount is 5 rpm, and the rotating speed compensation lasts for 3 ms; when the rolling piece bites in the 21st and 22nd finishing mill stand, the rotating speed compensation amount is 9 rpm, and the rotating speed compensation lasts for 5 ms; when the rolling piece bites in the 23rd and 24th finishing mill stand, the rotating speed compensation amount is 13 rpm, and the rotating speed compensation lasts for 8 ms.

[0107] Step 3, in the control of the upper roller ring linear speed stage, the diameter of the upper roller ring of the finished mill is larger than that of the lower roller ring by 0.05 mm, the linear speed of the upper roller ring is higher than that of the lower roller ring by 0.189 m / s, and the head of the rolling piece is controlled to be upturned.

[0108] Step 4, in the control of the pressure of the roller ring cooling water, it is detected that the actual water pressure of the water pipe close to the roller ring is 10.0 kg. A Y-type filter is installed on the water supply pipeline, and the filter screen is selected to be 40 mesh (screen hole size: 0.425 mm).

[0109] Through the above steps, the finished mill changes the roller ring four times in the specific implementation process, the quality is good, and no roller ring damage accident occurs.

[0110] Example five: the finished steel grade is HRB400E, the finished specification is 22 mm, and the rolling amount is 21627 tons.

[0111] Step 1, in the control of the tension between the finished rolling pieces, the micro tension between the finishing mill groups is set: the 19th and 20th finishing mill stands and the 21st and 22nd finishing mill stands are empty, the 20th and 21st finishing mill stands are empty, and the micro tension between the 23rd and 24th finishing mill stands is set to be 0.3% of the cross-sectional area change of the rolling piece.

[0112] Step 2, in the control of the head of the rolling piece bite impact stage, when the rolling piece bites in the 19th and 20th finishing mill stand, the rotating speed of the two rolling mills is compensated, the compensation amount is 8 rpm, and the rotating speed compensation lasts for 3 ms; when the rolling piece bites in the 21st and 22nd finishing mill stand, the rotating speed compensation amount is 11 rpm, and the rotating speed compensation lasts for 5 ms; when the rolling piece bites in the 23rd and 24th finishing mill stand, the rotating speed compensation amount is 14 rpm, and the rotating speed compensation lasts for 8 ms.

[0113] Step 3, in the control of the upper roller ring linear speed stage, the diameter of the upper roller ring of the finished mill is larger than that of the lower roller ring by 0.07 mm, the linear speed of the upper roller ring is higher than that of the lower roller ring by 0.22 m / s, and the head of the rolling piece is controlled to be upturned.

[0114] Step 4, in terms of controlling the pressure of the roller ring cooling water, it is detected that the actual water pressure of the water pipe close to the roller ring is 9.8 kg. A Y-type filter is installed on the water supply pipe, and the filter screen is selected to be 40 mesh (screen hole size: 0.425 mm).

[0115] Through the above steps, the finished product rack changes the roller ring four times in the specific implementation process, and the quality is good, and no roller ring damage accident occurs.

[0116] Example six: finished steel grade HRB400E, finished product specification 22 mm, rolling 16920 tons.

[0117] Step 1, in the tension stage of the control rolling piece finish rolling chamber, the micro tension between the finish rolling racks is set: the micro tension between the 19th and 20th finish rolling racks and the 21st and 22nd finish rolling racks is set to be 0.21% of the cross-sectional area change of the rolling piece.

[0118] Step 2, in the control rolling piece head biting impact stage, when the rolling piece bites into the 19th and 20th finish rolling racks, the speed of the two rolling mills is compensated, the compensation amount is 7 rpm, and the speed compensation duration is 3 ms; when the rolling piece bites into the 21st and 22nd finish rolling racks, the speed compensation amount is 12 rpm, and the speed compensation duration is 5 ms; when the rolling piece bites into the 23rd and 24th finish rolling racks, the speed compensation amount is 15 rpm, and the speed compensation duration is 8 ms.

[0119] Step 3, in the control of the linear speed of the upper roller ring stage, the diameter of the upper roller ring of the finished product rack is larger than that of the lower roller ring by 0.065 mm, the linear speed of the upper roller ring is higher than that of the lower roller ring by 0.204 m / s, and the head of the rolling piece is controlled to be upturned.

[0120] Step 4, in terms of controlling the pressure of the roller ring cooling water, it is detected that the actual water pressure of the water pipe close to the roller ring is 9.6 kg. A Y-type filter is installed on the water supply pipe, and the filter screen is selected to be 40 mesh (screen hole size: 0.425 mm).

[0121] Through the above steps, the finished product rack changes the roller ring three times in the specific implementation process, and the quality is good, and no roller ring damage accident occurs.

[0122] It should be noted that the above examples are only the best examples, and not the limitation of the embodiments of the application.

[0123] The above examples are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

[0124] Although the preferred embodiments of the present specification have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present specification.

[0125] Obviously, those skilled in the art can make various modifications and variations to the present specification without departing from the spirit and scope of the present specification. Thus, if these modifications and variations of the present specification fall within the scope of the claims of the present specification and their equivalents, the present specification also intends to include these modifications and variations.

Claims

1. A method for controlling the breakage of the roller ring of a high-speed bar finished product stand, characterized in that: include: Obtain operating parameters of a finishing mill in each production stage of a high-speed bar rolling production line; wherein the production stages include a heating stage, a roughing stage, an intermediate rolling stage, a pre-finishing rolling stage, a finishing rolling stage, a high-speed steel-laying stage, and a finishing stage; the high-speed bar rolling production line is provided with 24 finishing mills, 6 finishing mills are provided in the roughing stage, 4 finishing mills are provided in the intermediate rolling stage, 6 finishing mills are provided in the pre-finishing rolling stage, and 8 finishing mills are provided in the finishing rolling stage; the 24 finishing mills provided in the high-speed bar rolling production line are numbered from 1 to 24 according to the position sequence of the finishing mills on the production line; Extracting the working parameters of the finishing mill in the finishing rolling stage; wherein the finishing rolling stage includes a stage of controlling the tension of the rolled piece between finishing rolling, a stage of controlling the bite impact of the rolled piece head, a stage of controlling the linear speed of the upper roll ring, and a stage of controlling the cooling water of the finished stand roll ring; Adjusting the working parameters of the finishing mill in the finishing rolling stage to control the number of roll ring breakages of the finished product stand; wherein, adjusting the working parameters of the finishing mill in the finishing rolling stage includes: setting the tension between different finishing mill groups in the stage of controlling the tension between the finished product and the finished product stand; compensating the rotation speeds of the finishing mills in different stands in the stage of controlling the bite impact of the finished product head; adjusting the diameters of the upper and lower roll rings of the finished product stand in the stage of controlling the linear speed of the upper roll ring; and adjusting the pressure on the roll ring cooling water pipe in the stage of controlling the cooling water of the finished product stand; During the stage of controlling the bite impact of the rolled piece head, the rotational speeds of the finishing mills of different stands are compensated, including: when the rolled piece bites into the No. 19 and No. 20 finishing mill stands, the rotational speeds of the No. 19 and No. 20 finishing mill stands are compensated, the compensation amount is 5 to 8 revolutions per minute, and the duration of the rotational speed compensation is 3 milliseconds; when the rolled piece bites into the No. 21 and No. 22 finishing mill stands, the rotational speeds of the No. 21 and No. 22 finishing mill stands are compensated, the compensation amount is 9 to 12 revolutions per minute, and the duration of the rotational speed compensation is 5 milliseconds; when the rolled piece bites into the No. 23 and No. 24 finishing mill stands, the rotational speeds of the No. 23 and No. 24 finishing mill stands are compensated, the compensation amount is 13 to 15 revolutions per minute, and the duration of the rotational speed compensation is 8 milliseconds.

2. The method for controlling the breakage of the roller ring of the high-speed bar finished product machine according to claim 1 is characterized in that: In the stage of controlling the tension between the finished rolling mills, the tension between different finishing mills is set, including: The micro-tension between the No. 19 and No. 20 finishing mill stands and between the No. 21 and No. 22 finishing mill stands is set to 0.5% to 1.0% of the cross-sectional area change of the rolled piece; The micro-tension between the No. 20 and No. 21 finishing mill stands is set to 0.3% to 0.5% of the cross-sectional area change of the rolled piece; The micro-tension between the No. 23 and No. 24 finishing mill stands is set to 0.1% to 0.3% of the cross-sectional area change of the rolled piece.

3. The method for controlling the breakage of the roller ring of the high-speed bar finished product machine according to claim 1, characterized in that: In the stage of controlling the linear speed of the upper roller ring, the diameters of the upper and lower roller rings of the finished product frame are adjusted, including: Adjust the diameter difference between the upper and lower roller rings of the finished product frame to between 0.05 mm and 0.08 mm.

4. The method for controlling the breakage of the roller ring of the high-speed bar finished product machine according to claim 1, characterized in that: In the stage of controlling the cooling water supply to the roller rings of the finished product stand, the pressure on the roller ring cooling water pipe is adjusted, including: Increase the pressure on the roller ring cooling water pipe to 9 to 10 kg.

5. The method for controlling the breakage of the roller ring of the high-speed bar finished product machine according to claim 1, characterized in that: Adjusting the stand operating parameters in the finishing rolling stage also includes: In the stage of controlling the cooling water of the finished product stand roller ring, a Y-type filter is provided on the water supply pipeline to prevent the nozzle of the cooling water pipe from being blocked.

6. The method for controlling the breakage of the roller ring of the high-speed bar finished product machine according to claim 5, characterized in that: The Y-type filter is provided with a filter screen, and the specification of the filter screen is 40 meshes.

7. The method for controlling the breakage of the roller ring of the high-speed bar finished product machine according to claim 6, characterized in that: A pressure gauge is provided on the roller box body pipe behind the filter to monitor the cooling water pressure through the pressure gauge.

8. The method for controlling the breakage of the roller ring of the high-speed bar finished product machine according to claim 7, characterized in that: When the pressure gauge shows that the current pressure loss is greater than the preset value, the filter screen is cleaned.

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