Method for controlling damage of roll collar of high-speed finished bar rack

Abstract

The invention discloses a method for controlling damage of a roll collar of a high-speed bar finished product rack, and relates to the technical field of bar rolling technologies. The method comprises the steps that working parameters of a finishing mill at all production stages in a high-speed bar rolling production line are obtained; working parameters of a finishing mill in the finish rolling stage are extracted; and working parameters of a finishing mill in the finish rolling stage are adjusted so as to control the damage frequency of a roll collar of a finish rolling finished product rack. By controlling tension during finish rolling of the rolled piece, controlling biting impact of the head of the rolled piece, adopting an upper pressing method for the finished product rack, improving cooling water of the roll collar and the like, production accidents caused by damage of the roll collar of the finish rolling finished product rack are reduced by controlling steel biting stability and the cooling effect of the roll collar, and stable production is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of bar rolling technology, and in particular to a method for controlling the breakage of a roller ring of a high-speed bar finished product stand. Background Art

[0002] Rebar is a type of steel product with a large consumption volume, accounting for about 20% of the total steel consumption. In recent years, the apparent consumption of rebar in my country is about 250 million tons, which is the main steel used in construction. Judging from the economic development of some regions in recent years, the demand for rebar has maintained a stable trend.

[0003] The current process flow of high-speed bar production line for producing steel bars is: feeding, heating, rough rolling, intermediate rolling, pre-finishing rolling, finishing rolling, high-speed zone, finishing collection, and storage. Finishing rolling consists of 6 main rolling mills. Steel bars are mainly produced by engraving bean-shaped grooves on the upper and lower working rolls of the finishing mill. When the rolled piece is rolled on the finished mill, under the action of rolling force, the bean-shaped grooves of the upper and lower working rolls are printed on the surface of the rolled piece to form crescent-shaped ribs, which are collectively called steel bars.

[0004] In the process of producing finished products with specifications of R12-R22mm through high-speed bar process, the roller rings of the finishing rolling finished product stand are frequently damaged. From the macroscopic morphology, the roller ring damage occurs in both horizontal and vertical directions, which can easily cause steel pile accidents and scrap, seriously affecting production and product quality stability.

[0005] In summary, it is necessary to propose a method for controlling the breakage of the roller ring of the high-speed bar finished product stand to solve the above problems. Summary of the invention

[0006] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0007] This application specifically includes the following aspects:

[0008] In a first aspect, the present application proposes a method for controlling the breakage of a high-speed bar finished product stand roller ring, comprising:

[0009] Obtain working parameters of the finishing mill in each production stage of the high-speed bar rolling production line; wherein the production stage includes 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;

[0010] 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 product stand roll ring;

[0011] The working parameters of the finishing mill in the finishing rolling stage are adjusted to control the number of roll ring breakages of the finishing product stand.

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

[0013] In the stage of controlling the tension between the finished rolling mills, the tension between different finishing mill groups is set;

[0014] In the stage of controlling the biting impact of the rolled piece head, the rotation speeds of the finishing mills of different stands are compensated;

[0015] 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;

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

[0017] In a feasible implementation manner, during the stage of controlling the tension between the finished rolling mills, the tension between different finishing mills is set, including:

[0018] 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;

[0019] 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;

[0020] 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 variation of the rolled piece.

[0021] In a feasible implementation manner, during the stage of controlling the biting impact of the rolled piece head, the rotation speeds of the finishing mills of different stands are compensated, including:

[0022] When the rolled piece is bitten in the No. 19 and No. 20 finishing mill stands, the speed of the No. 19 and No. 20 finishing mill stands is compensated, the compensation amount is 5 to 8 revolutions per minute, and the speed compensation lasts for 3 milliseconds;

[0023] When the rolled piece is bitten in the No. 21 and No. 22 finishing mill stands, the rotation 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 rotation speed compensation lasts for 5 milliseconds;

[0024] When the rolled piece is bitten in the No. 23 and No. 24 finishing mill stands, the rotation speeds of the No. 23 and No. 24 finishing mill stands are compensated by 13 to 15 revolutions per minute, and the rotation speed compensation lasts for 8 milliseconds.

[0025] In a feasible implementation manner, in the stage of controlling the linear speed of the upper roller ring, adjusting the diameters of the upper and lower roller rings of the finished product frame includes:

[0026] Adjust the diameter difference between the upper and lower roller rings of the finished machine frame to between 0.05 mm and 0.08 mm.

[0027] In a feasible implementation manner, in the stage of controlling the cooling water of the roller ring of the finished product frame, the pressure on the roller ring cooling water pipe is adjusted, including:

[0028] Increase the pressure on the roll ring cooling water pipe to 9 to 10 kg.

[0029] In a feasible implementation manner, adjusting the stand operating parameters in the finishing rolling stage further includes:

[0030] In the stage of controlling the cooling water of the finished product rack roller ring, 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 manner, a filter screen is provided on the Y-type filter, and the specification of the filter screen is 40 meshes.

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

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

[0034] In summary, the method for controlling the breakage of the roller ring of the high-speed bar finished product frame proposed in the present application realizes the rolling process without steel stretching by controlling the tension between the workpiece finishing rolling, thereby solving the problem of the large head of the workpiece; reduces the impact force of the head of the workpiece on the roller ring rolling groove by controlling the linear speed of the roller ring at the moment the head of the workpiece bites; controls the upward warping of the head of the workpiece by appropriately increasing the linear speed of the upper roller ring; and improves the cooling effect of the roller ring of the finished product frame by increasing the cooling water pressure of the roller ring.

[0035] The method for controlling the breakage of the roller ring of the high-speed bar finished product machine frame proposed in this application, and other advantages, objectives and features of this application will be reflected in part through the following description, and in part will also be understood by technical personnel in this field through research and practice of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present specification. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0037] Figure 1 A schematic diagram of the process of controlling the breakage of the roller ring of a high-speed bar finished product stand provided in an embodiment of the present application;

[0038] Figure 2 A high-speed rod production process flow chart provided in an embodiment of the present application;

[0039] Figure 3 A schematic diagram of installing a Y-type filter on a roller ring cooling water pipe provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification are described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

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

[0042] During the production process of the existing high-speed bar production line, the roller rings of the finishing rolling mill stand are frequently damaged, which seriously affects 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 bite impact of the head of the rolled product, using the upper pressure method for the finished product stand and improving the roller ring cooling water, so as to achieve the purpose of controlling the breakage of the roller rings of the finished product stand.

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

[0045] S110. Obtain working parameters of the finishing mill in each production stage of 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-laying 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 The high-speed bar production line provided in this application is mainly composed of seven parts: heating furnace, rough rolling mill, intermediate rolling mill, pre-finishing mill, finishing mill, high-speed steel feeding system and finishing collection.

[0047] S120, 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 product stand roll ring.

[0048] Exemplarily, in the stage of controlling the tension between the finished rolling mills, the micro-tension between the finishing rolling mills is set, in the stage of controlling the bite impact of the head of the rolled piece, the speed compensation of the biting steel is performed, in the stage of controlling the linear speed of the upper roll ring, the diameters of the upper and lower roll rings of the finished product frame are adjusted, and in the stage of controlling the cooling water of the roll rings of the finished product frame, the water pipe pressure is increased.

[0049] S130, adjusting the working parameters of the finishing mill in the finishing rolling stage to control the number of roll ring breakages of the finishing product stand.

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

[0051] In the stage of controlling the tension between the finished rolling mills, the tension between different finishing mill groups is set;

[0052] In the stage of controlling the biting impact of the rolled piece head, the rotation speeds of the finishing mills of different stands are compensated;

[0053] 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;

[0054] In the stage of controlling the cooling water of the roller rings of the finished product stand, the pressure on the roller ring cooling water pipe is adjusted.

[0055] For example, by controlling the tension between the workpiece and the finishing rolling, the rolling process can be achieved without steel stretching, thus solving the problem of the large head of the workpiece; by controlling the linear speed of the roll ring at the moment the head of the workpiece bites into the roll ring, the impact force of the head of the workpiece on the roll ring groove can be reduced; by appropriately increasing the linear speed of the upper roll ring, the upward warping of the head of the workpiece can be controlled; and by increasing the cooling water pressure of the roll ring, the cooling effect of the roll ring of the finished product frame can be improved.

[0056] In some examples, during the stage of controlling the tension between the finished rolling mills, the tension between different finishing mill groups is set, including:

[0057] 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;

[0058] 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;

[0059] 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 variation of the rolled piece.

[0060] Exemplarily, when the rolled piece is in the finishing stage, the tension between different finishing mill stands is set. Specifically, 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.

[0061] In some examples, during the stage of controlling the biting impact of the rolling piece head, the rotation speeds of the finishing mills of different stands are compensated, including:

[0062] When the rolled piece is bitten in the No. 19 and No. 20 finishing mill stands, the speed of the No. 19 and No. 20 finishing mill stands is compensated, the compensation amount is 5 to 8 revolutions per minute, and the speed compensation lasts for 3 milliseconds;

[0063] When the rolled piece is bitten in the No. 21 and No. 22 finishing mill stands, the rotation 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 rotation speed compensation lasts for 5 milliseconds;

[0064] When the rolled piece is bitten in the No. 23 and No. 24 finishing mill stands, the rotation speeds of the No. 23 and No. 24 finishing mill stands are compensated by 13 to 15 revolutions per minute, and the rotation speed compensation lasts for 8 milliseconds.

[0065] Exemplarily, in the stage of controlling the impact of the biting of the workpiece head, different speed compensation measures are taken for finishing mills of different stands. Specifically, when the workpiece bites into the No. 19 and No. 20 finishing mill stands, the speed of the two mills is compensated, the compensation amount is 5 to 8 revolutions per minute (rpm), and the speed compensation lasts for 3 milliseconds (ms). When the workpiece bites into the No. 21 and No. 22 finishing mill stands, the speed compensation amount is 9 to 12 rpm, and the time is 5 ms. When the workpiece bites into the No. 23 and No. 24 finishing mill stands, the speed compensation amount is 13 to 15 rpm, and the time is 8 ms.

[0066] In some examples, during 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:

[0067] Adjust the diameter difference between the upper and lower roller rings of the finished machine frame to between 0.05 mm and 0.08 mm.

[0068] For example, when controlling the linear speed of the upper roll ring of the rolling mill, the roll ring diameter used by the upper roll of the finished stand (the stand of the last rolling process) is 0.05 mm to 0.08 mm larger than the roll ring diameter of the lower roll. Due to the different roll ring diameters, the linear speed will be different at the same rotation speed. Due to this diameter difference, the linear speed of the upper roll is 0.157 m / s to 0.251 m / s higher than the linear speed of the lower roll. The purpose of this is to control the upward tilting 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, 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:

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

[0071] For example, in the stage of controlling the cooling water of the roller ring of the finished product rack, the flow area of ​​the water supply pipe is increased by increasing the water pipe pressure to 9-10 kg on the roller ring cooling water pipe. Under normal circumstances, if there is a shrinkage problem in the intermediate piping, it will cause pressure and flow loss. This application reduces the pressure and flow loss caused by the shrinkage of the intermediate piping by increasing the pressure, thereby improving the heat exchange effect of the roller ring, enabling the roller ring to dissipate heat better, and ensuring the stability of the production process and product quality.

[0072] In some examples, adjusting the stand operating parameters in the finishing rolling stage further includes:

[0073] In the stage of controlling the cooling water of the finished product rack roller ring, a Y-type filter is arranged on the water supply pipeline to prevent the nozzle of the cooling water pipe from being blocked.

[0074] For example, it is found that during the production process, individual nozzles of the cooling water pipes are often blocked by iron filings, plastic sheets and other debris. These debris block the nozzles, which will lead to uneven cooling of the roller ring groove, thus causing cracks in the roller ring, affecting the service life of the roller ring and product quality. Figure 3 As shown, the present invention is to install a Y-type filter (i.e. Figure 3 The middle hand valve DN50) can solve this problem.

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

[0076] For example, the filter screen of the Y-type filter is selected to have a 40-mesh specification (sieve size is 0.425 mm). This can reduce the probability of nozzle clogging caused by impurities in the water, because the 40-mesh filter screen can filter most of the particles without causing a large pressure loss, thus ensuring the normal supply of cooling water and the cooling effect of the roller ring.

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

[0078] Exemplarily, a pointer pressure gauge is installed on the roller box body pipe after 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 a preset value, the filter is cleaned.

[0080] For example, if the pressure loss is greater than 1 bar, the filter screen is cleaned to effectively solve the nozzle blockage problem and ensure the uniformity of the roller ring cooling.

[0081] In summary, the method for controlling the breakage of the roller rings of the high-speed bar finished product rack provided by the present application, in the stage of controlling the tension between the finished rolling of the rolled piece, sets the tension between different finishing mills, because the finishing mill has a small cross-section and a high speed. If there is tension between the finishing mills during steel drawing rolling, the head of the rolled piece is larger than the target size, and the larger size has a greater impact on the roller rings of the unit. The finished product rack has a crescent groove, and the stress concentration point of the roller ring and the impact of the rolled piece are superimposed, which will cause fatigue and shedding of the roller ring surface. The tension between the finishing mills must be designed according to a certain amount. If the micro-tension is too small, it will cause steel piling between the units. If the micro-tension is too large, the head of the rolled piece is too large and cannot be effectively controlled, and the purpose of reducing the impact of the large size of the rolled piece on the roller ring cannot be achieved.

[0082] In the control of the impact of the workpiece head biting into the roll gap, the present application compensates for the rotation speed of the finishing mills of different runs. This is because when the workpiece head enters the roll gap, the workpiece has a certain impact on the roll gap. In order to reduce the impact of the workpiece head on the roll ring, the speed of the roll ring is appropriately increased to increase the force of the roll ring on the workpiece. Scientific roll ring speed compensation and compensation time are the key to controlling the impact of the workpiece head on the roll ring.

[0083] The present application adjusts the diameters of the upper and lower roller rings of the finished product frame in the stage of controlling the linear speed of the upper roller ring. This is because the head of the workpiece shows an obvious tendency to warp in the finishing mill after multiple rolling passes. The warped head of the workpiece enters the roller ring groove, which easily causes a greater impact on the upper roller ring than the lower roller ring. After continuous production, the upper roller ring is significantly more damaged than the lower roller ring. Therefore, the roller ring adopts the positive pressure method, that is, the diameter of the upper roller ring is 0.05-0.08mm larger than the diameter of the lower roller ring, so that the linear speed of the upper roller ring is 0.157-0.251m / s higher than that of the lower roller ring, which can effectively solve the problem of workpiece warping.

[0084] In the stage of controlling the cooling water of the finished product stand roller ring, the pressure on the roller ring cooling water pipe is adjusted because the material of the roller ring is a cemented carbide made of a mixture of tungsten carbide and cobalt, and the CW content is generally 60-85%. The higher the carbide content, the better the wear resistance. At the same time, the crack sensitivity of the rolled piece to the impact of the roller ring is also stronger, but it is not conducive to stable production. The carbide roller ring has excellent wear resistance and can extend the service life of the roller ring in the machine, but the heat dissipation effect of the carbide roller ring is poor. The original design of the roller ring cooling water pressure is 8 kg. After testing by installing a pressure gauge on the water pipe near the roller ring, the actual water pressure is 5-6.5 kg. The surface of the crescent groove of the finished product roll ring is blue, which indicates that the roller ring is damaged due to insufficient cooling capacity during service. In the present application, 14 kg of water tank cooling water is used to cool the finished product stand roller ring. After testing by installing a pressure gauge on the water pipe near the roller ring, the water pressure reaches 9-10 kg, which improves the heat exchange effect of the roller ring. There are 11 nozzles in the cooling water pipe of the roller ring, each of which is a 5mm diameter round tube, and is arranged along the tangent direction of the roller ring circumference. It was found in production that some nozzles of the cooling water pipe were often blocked by iron filings, plastic cloth and other debris, which were not easy to find in time and difficult to clean, resulting in uneven cooling of the roller ring groove and cracks. By installing a Y-type filter on the water supply pipe beside the machine, the filter screen is selected with a 40-mesh specification (sieve size: 0.425mm) to ensure that most of the particles are filtered without causing a large pressure loss, and a pointer pressure gauge is installed on the roller 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 roller ring cooling.

[0085] The technical solution of the present application is further described in detail below through specific embodiments.

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

[0087] Step 1. In the stage of controlling the tension between the finished rolling mills, the micro-tension between the finishing mills is set as follows: 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 0.55% of the change in the cross-sectional area of ​​the rolled piece; the micro-tension between the No. 20 and No. 21 finishing mill stands is set to 0.3% of the change in the cross-sectional area of ​​the rolled piece; the micro-tension between the No. 23 and No. 24 finishing mill stands is set to 0.12% of the change in the cross-sectional area of ​​the rolled piece.

[0088] Step 2. During the impact stage of the workpiece head biting, when the workpiece bites into the No. 19 and No. 20 finishing mill stands, the speed of the two mills is compensated by 5 rpm, and the speed compensation lasts for 3 ms; when the workpiece bites into the No. 21 and No. 22 finishing mill stands, the speed compensation is 9 rpm, and the speed compensation lasts for 5 ms; when the workpiece bites into the No. 23 and No. 24 finishing mill stands, the speed compensation is 13 rpm, and the speed compensation lasts for 8 ms.

[0089] Step 3: When controlling the linear speed of the upper roller ring, the diameter of the upper roller ring of the finished product frame is 0.05 mm larger than that of the lower roller ring, so that the linear speed of the upper roller ring is 0.158 m / s higher than that of the lower roller ring, thereby controlling the upward warping of the head of the rolled piece.

[0090] Step 4: In terms of controlling the pressure of the roller ring cooling water, after testing, 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 pipe, and the filter screen is selected with a 40-mesh specification (sieve size: 0.425mm).

[0091] Through the above steps, the roller rings of the finished product frame were replaced three times during the specific implementation process, the quality was good, and no roller ring damage accidents occurred.

[0092] Embodiment 2: Finished steel grade HRB400E, finished product specification 12mm, rolling 20745 tons.

[0093] Step 1. In the stage of controlling the tension between the finished rolling mills, the micro-tension between the finishing mills is set as follows: 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 0.9% of the change in the cross-sectional area of ​​the rolled piece; the micro-tension between the No. 20 and No. 21 finishing mill stands is set to 0.45% of the change in the cross-sectional area of ​​the rolled piece; the micro-tension between the No. 23 and No. 24 finishing mill stands is set to 0.25% of the change in the cross-sectional area of ​​the rolled piece.

[0094] Step 2. During the impact stage of the workpiece head biting, when the workpiece bites into the No. 19 and No. 20 finishing mill stands, the speed of the two mills is compensated by 8 rpm, and the speed compensation lasts for 3 ms; when the workpiece bites into the No. 21 and No. 22 finishing mill stands, the speed compensation is 12 rpm, and the speed compensation lasts for 5 ms; when the workpiece bites into the No. 23 and No. 24 finishing mill stands, the speed compensation is 15 rpm, and the speed compensation lasts for 8 ms.

[0095] Step 3: When controlling the linear speed of the upper roller ring, the diameter of the upper roller ring of the finished product frame is 0.08 mm larger than that of the lower roller ring, so that the linear speed of the upper roller ring is 0.251 m / s higher than that of the lower roller ring, thereby controlling the upward warping of the head of the rolled piece.

[0096] Step 4: In terms of controlling the pressure of the roller ring cooling water, after testing, 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 with a 40-mesh specification (sieve size: 0.425mm).

[0097] Through the above steps, the roller rings of the finished product frame were replaced five times during the specific implementation process, with good quality and no roller ring damage accidents.

[0098] Example 3: Finished steel grade HRB400E, finished product specification 18mm, rolled 27051 tons.

[0099] Step 1. In the stage of controlling the tension between the finished rolling mills, the micro-tension between the finishing mills is set as follows: there is no tension between the No. 19 and No. 20 finishing mill stands and between the No. 21 and No. 22 finishing mill stands, there is no tension between the No. 20 and No. 21 finishing mill stands, and the micro-tension between the No. 23 and No. 24 finishing mill stands is set to 0.2% of the change in the cross-sectional area of ​​the rolled piece.

[0100] Step 2. During the impact stage of the workpiece head biting, when the workpiece bites into the No. 19 and No. 20 finishing mill stands, the speed of the two mills is compensated by 7 rpm, and the speed compensation lasts for 3 ms; when the workpiece bites into the No. 21 and No. 22 finishing mill stands, the speed compensation is 10 rpm, and the speed compensation lasts for 5 ms; when the workpiece bites into the No. 23 and No. 24 finishing mill stands, the speed compensation is 15 rpm, and the speed compensation lasts for 8 ms.

[0101] Step 3: When controlling the linear speed of the upper roller ring, the diameter of the upper roller ring of the finished product frame is 0.06 mm larger than that of the lower roller ring, so that the linear speed of the upper roller ring is 0.189 m / s higher than that of the lower roller ring, thereby controlling the upward warping of the head of the rolled piece.

[0102] Step 4: In terms of controlling the pressure of the roller ring cooling water, after testing, 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 with a 40-mesh specification (sieve size: 0.425mm).

[0103] Through the above steps, the roller rings of the finished product frame were replaced five times during the specific implementation process, with good quality and no roller ring damage accidents.

[0104] Embodiment 4: Finished steel grade HRB400E, finished product specification 18mm, rolling 19031 tons.

[0105] Step 1. In the stage of controlling the tension between the finished rolling mills, the micro-tension between the finishing mills is set as follows: there is no tension between the No. 19 and No. 20 finishing mill stands and between the No. 21 and No. 22 finishing mill stands, there is no tension between the No. 20 and No. 21 finishing mill stands, and the micro-tension between the No. 23 and No. 24 finishing mill stands is set to 0.3% of the change in the cross-sectional area of ​​the rolled piece.

[0106] Step 2. During the impact stage of the workpiece head biting, when the workpiece bites into the No. 19 and No. 20 finishing mill stands, the speed of the two mills is compensated by 5 rpm, and the speed compensation lasts for 3 ms; when the workpiece bites into the No. 21 and No. 22 finishing mill stands, the speed compensation is 9 rpm, and the speed compensation lasts for 5 ms; when the workpiece bites into the No. 23 and No. 24 finishing mill stands, the speed compensation is 13 rpm, and the speed compensation lasts for 8 ms.

[0107] Step 3: When controlling the linear speed of the upper roller ring, the diameter of the upper roller ring of the finished product frame is 0.05 mm larger than that of the lower roller ring, so that the linear speed of the upper roller ring is 0.189 m / s higher than that of the lower roller ring, thereby controlling the upward warping of the head of the rolled piece.

[0108] Step 4: In terms of controlling the pressure of the roller ring cooling water, after testing, 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 pipe, and the filter screen is selected with a 40-mesh specification (sieve size: 0.425mm).

[0109] Through the above steps, the roller rings of the finished product frame were replaced four times during the specific implementation process, with good quality and no roller ring breakage accidents.

[0110] Embodiment 5: Finished steel grade HRB400E, finished product specification 22mm, rolling 21627 tons.

[0111] Step 1. In the stage of controlling the tension between the finished rolling mills, the micro-tension between the finishing mills is set as follows: there is no tension between the No. 19 and No. 20 finishing mill stands and between the No. 21 and No. 22 finishing mill stands, there is no tension between the No. 20 and No. 21 finishing mill stands, and the micro-tension between the No. 23 and No. 24 finishing mill stands is set to 0.3% of the change in the cross-sectional area of ​​the rolled piece.

[0112] Step 2. During the impact stage of the workpiece head biting, when the workpiece bites into the No. 19 and No. 20 finishing mill stands, the speed of the two mills is compensated by 8 rpm, and the speed compensation lasts for 3 ms; when the workpiece bites into the No. 21 and No. 22 finishing mill stands, the speed compensation is 11 rpm, and the speed compensation lasts for 5 ms; when the workpiece bites into the No. 23 and No. 24 finishing mill stands, the speed compensation is 14 rpm, and the speed compensation lasts for 8 ms.

[0113] Step 3: When controlling the linear speed of the upper roller ring, the diameter of the upper roller ring of the finished product frame is 0.07 mm larger than that of the lower roller ring, so that the linear speed of the upper roller ring is 0.22 m / s higher than that of the lower roller ring, thereby controlling the upward warping of the head of the rolled piece.

[0114] Step 4: In terms of controlling the pressure of the roller ring cooling water, after testing, 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 with a 40-mesh specification (sieve size: 0.425mm).

[0115] Through the above steps, the roller rings of the finished product frame were replaced four times during the specific implementation process, with good quality and no roller ring breakage accidents.

[0116] Embodiment 6: Finished steel grade HRB400E, finished product specification 22mm, rolling 16920 tons.

[0117] Step 1. In the stage of controlling the tension between the finished rolling mills, the micro-tension between the finishing mills is set as follows: there is no tension between the No. 19 and No. 20 finishing mill stands and between the No. 21 and No. 22 finishing mill stands, there is no tension between the No. 20 and No. 21 finishing mill stands, and the micro-tension between the No. 23 and No. 24 finishing mill stands is set to 0.21% of the change in the cross-sectional area of ​​the rolled piece.

[0118] Step 2. During the impact stage of the workpiece head biting, when the workpiece bites into the No. 19 and No. 20 finishing mill stands, the speed of the two mills is compensated by 7 rpm, and the speed compensation lasts for 3 ms; when the workpiece bites into the No. 21 and No. 22 finishing mill stands, the speed compensation is 12 rpm, and the speed compensation lasts for 5 ms; when the workpiece bites into the No. 23 and No. 24 finishing mill stands, the speed compensation is 15 rpm, and the speed compensation lasts for 8 ms.

[0119] Step 3: When controlling the linear speed of the upper roller ring, the diameter of the upper roller ring of the finished product frame is 0.065 mm larger than that of the lower roller ring, so that the linear speed of the upper roller ring is 0.204 m / s higher than that of the lower roller ring, thereby controlling the upward warping of the head of the rolled piece.

[0120] Step 4: In terms of controlling the pressure of the roller ring cooling water, after testing, 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 with a 40-mesh specification (sieve size: 0.425mm).

[0121] Through the above steps, the roller rings of the finished product frame were replaced three times during the specific implementation process, the quality was good, and no roller ring damage accidents occurred.

[0122] It should be noted that the above embodiments are only the best examples and are not limitations on the implementation methods of the present application.

[0123] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

[0124] Although the preferred embodiments of this specification have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of this specification.

[0125] Obviously, those skilled in the art can make various changes and modifications to this specification without departing from the spirit and scope of this specification. Thus, if these modifications and variations of this specification fall within the scope of the claims of this specification and their equivalents, this specification is also intended 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 working parameters of the finishing mill in each production stage of the high-speed bar rolling production line; wherein the production stage includes 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; 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 product stand roll ring; The working parameters of the finishing mill in the finishing rolling stage are adjusted to control the number of roll ring breakages of the finishing product stand.

2. The method for controlling the breakage of the roller ring of the high-speed bar finished product stand according to claim 1 is characterized in that: Adjusting the working parameters of the finishing mill in the finishing rolling stage includes: In the stage of controlling the tension between the finished rolling mills, the tension between different finishing mill groups is set; In the stage of controlling the biting impact of the rolled piece head, the rotation speeds of the finishing mills of different stands are compensated; 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; In the stage of controlling the cooling water of the roller rings of the finished product stand, the pressure on the roller ring cooling water pipe is adjusted.

3. The method for controlling the breakage of the roller ring of the high-speed bar finished product machine frame according to claim 2 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 variation of the rolled piece.

4. The method for controlling the breakage of the roller ring of the high-speed bar finished product machine frame according to claim 2 is characterized in that: In the stage of controlling the biting impact of the rolled piece head, the rotation speeds of the finishing mills of different stands are compensated, including: When the rolled piece is bitten in the No. 19 and No. 20 finishing mill stands, the speed of the No. 19 and No. 20 finishing mill stands is compensated, the compensation amount is 5 to 8 revolutions per minute, and the speed compensation lasts for 3 milliseconds; When the rolled piece is bitten in the No. 21 and No. 22 finishing mill stands, the rotation 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 rotation speed compensation lasts for 5 milliseconds; When the rolled piece is bitten in the No. 23 and No. 24 finishing mill stands, the rotation speeds of the No. 23 and No. 24 finishing mill stands are compensated by 13 to 15 revolutions per minute, and the rotation speed compensation lasts for 8 milliseconds.

5. The method for controlling the breakage of the roller ring of the high-speed bar finished product machine frame according to claim 2, 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 machine frame to between 0.05 mm and 0.08 mm.

6. The method for controlling the breakage of the roller ring of the high-speed bar finished product machine frame according to claim 2, characterized in that: In the stage of controlling the cooling water of the roller ring of the finished product stand, the pressure on the roller ring cooling water pipe is adjusted, including: Increase the pressure on the roll ring cooling water pipe to 9 to 10 kg.

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

8. The method for controlling the breakage of the roller ring of the high-speed bar product machine frame according to claim 7, characterized in that: The Y-type filter is provided with a filter screen, and the specification of the filter screen is 40 meshes.

9. The method for controlling the breakage of the roller ring of the high-speed bar product machine frame according to claim 8, 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.

10. The method for controlling the breakage of the roller ring of the high-speed bar finished product machine frame according to claim 9, characterized in that: When the pressure gauge shows that the current pressure loss is greater than a preset value, the filter screen is cleaned.

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