Hot-rolled C-shaped steel pass and rolling schedule design method based on numerical simulation

Abstract

The invention discloses a hot-rolled C-shaped steel pass and rolling schedule design method based on numerical simulation. The method comprises the steps that S1, pass and rolling schedule design is conducted; s2, rolling numerical simulation and pass regulation optimization are carried out, and an optimization result is obtained; and S3, in actual production, verifying the optimization result. According to the hot-rolled C-shaped steel pass and rolling schedule design method based on numerical simulation, numerical simulation verification can be carried out on pass and rolling schedule design results, the efficiency and accuracy of pass and schedule design are improved, the production cost is reduced, the product development speed is increased, and the safety of field trial-manufacturing production is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of hot-rolled steel design and production, and specifically relates to a hot-rolled C-shaped steel pass and rolling procedure design method based on numerical simulation. Background Art

[0002] Railway bridge bearings are important structural components that connect the upper and lower structures of railway bridges. They are located between the bridge and the pad stone and are important force transmission devices of the bridge. At present, the bearing plates on domestic railway bridge bearings are mainly processed by die casting. However, the method of processing bearings by die casting has the disadvantages of large processing volume and high processing cost. The design unit of the bearing proposed to develop hot-rolled C-shaped steel with an appearance similar to that of die casting billets, so as to gradually replace die casting billets, give full play to the advantages of high efficiency and high dimensional accuracy of hot-rolled steel, and reduce the cost of bearing processing.

[0003] In the design process of the hole profile and rolling schedule of hot-rolled C-shaped steel, the traditional design method usually completes the design based on a certain design method combined with work experience, and verifies the rationality of the hole profile and rolling schedule through on-site production trials. This method not only increases the manufacturing cost, but also prolongs the manufacturing cycle. It is impossible to reasonably optimize the hole profile and rolling schedule of hot-rolled C-shaped steel based on numerical simulation, and the degree of intelligence is low, which increases the design difficulty.

[0004] Chinese patent application number 201910530269.3 discloses a roll forging process, a roll forging die and a fully automatic roll forging machine, which relate to the technical field of forging. The roll forging process includes the following steps: determining the raw material of the turnbuckle body, determining the roll forging drawing, designing the hole type of each pass, drawing the die drawing, finite element numerical simulation verification and finally roll forging; the above process can greatly reduce the impact force of the final forging forming equipment. By completely using the roll forging forming die for the material to be roll forged, an air hammer is no longer required for the process of making the blank, which alleviates the technical problems of low efficiency of forging turnbuckle blank making and the inability to guarantee the quality of the turnbuckle body after forming in the prior art; it improves production efficiency and forming quality, and can reduce the tonnage design of the final forging forming equipment in the actual production process, reducing the labor intensity of workers and being more practical.

[0005] The Chinese patent with application number 202410516357.9 discloses a method for detecting defects in cultural heritage by infrared thermal imaging based on numerical simulation. The present invention aims to provide a method for detecting defects in cultural heritage by infrared thermal imaging based on numerical simulation to solve the limitations of current nondestructive testing technology in the application of cultural heritage. The present invention adopts the following steps: Step 1: Prepare infrared thermal imaging experimental samples. The selected cultural heritage artworks or their imitations are used as samples A and B, which are prepared and analyzed. Positioning is performed using the xz coordinate reference system. Step 2: Perform infrared thermal imaging experiments. Step 3: Perform numerical simulation experiments. Use CAD software to perform three-dimensional modeling of the sample, and use simulation software to perform simulation experiments of heat transfer and thermal response in combination with physical parameters to optimize the experimental scheme and predict the experimental results. Step 4: Implement numerical simulation experiments. Step 5: Compare and analyze the results of actual experiments and simulation experiments.

[0006] It is hoped to provide a hot-rolled C-shaped steel pass profile and rolling schedule design method, especially how to improve the efficiency of hot-rolled C-shaped steel pass profile and rolling schedule design. Summary of the invention

[0007] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a hot-rolled C-shaped steel pass profile and rolling schedule design method based on numerical simulation, the purpose of which is to improve the efficiency of hot-rolled C-shaped steel pass profile and rolling schedule design.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is: a hot-rolled C-shaped steel pass profile and rolling schedule design method based on numerical simulation, comprising the steps of:

[0009] S1. Pass profile and rolling procedure design;

[0010] S2, rolling numerical simulation and pass profile optimization to obtain the optimization results;

[0011] S3. In actual production, verify the optimization results.

[0012] In the step S1, the hot-rolled C-shaped steel is rolled using a near-net-shape profiled blank, using a billet rolling plus a universal rolling method, and designing corresponding billet rolling and universal pass profiles.

[0013] In the step S2, CAD software is used to draw a two-dimensional drawing of the billet and the hole type; Marc Mentat software is used to perform full-pass rolling numerical simulation of the hot-rolled C-shaped steel hole type and schedule; CAD software is used to analyze the product size; based on the numerical simulation results, the hole type and rolling schedule are preliminarily optimized to obtain the optimization result.

[0014] In step S2, first, the two-dimensional drawing of the blank is divided into two-dimensional meshes according to the curvature of the geometric figure, and then a three-dimensional entity is obtained by expanding the two-dimensional meshes.

[0015] In step S2, first, the two-dimensional figure of the blank is manually segmented, two-dimensional meshes are adaptively divided according to the deformation degree of different regions, and then a three-dimensional entity is obtained by expanding the two-dimensional meshes.

[0016] In step S2, in the expansion parameter setting, the length of each expansion shall not be greater than 2 times the average size of the two-dimensional meshes.

[0017] In step S2, corresponding material properties are set according to the composition of the used blank, and the material properties include the density, Young's modulus, and Poisson's ratio of the blank.

[0018] In step S2, the ambient temperature is set to 20 - 30 °C, and the heat transfer coefficient between the blank and the external environment is set to 70 - 90 W / (m 2 °C).

[0019] In step S2, the starting rolling temperature of the blank is set to 1200 - 1300 °C, the finishing rolling temperature is set to 850 - 950 °C, and the surface temperature of the rolling roll is set to 180 - 220 °C

[0020] In step S3, in actual production, qualified blanks are selected and on-site rolling is carried out using the set rolling process parameters; the rolling process of each pass is observed, the rolling force and the bar shape of the rolled piece in each pass are recorded, the surface quality, dimensions, and mechanical properties of the finished product are inspected and analyzed, and the filling condition of the pass is inspected and analyzed; according to the actual production situation combined with the numerical simulation results, the design scheme of the pass and the rolling schedule is further optimized.

[0021] The hot-rolled C-shaped steel pass and rolling schedule design method based on numerical simulation of the present invention can numerically simulate and verify the design results of the pass and the rolling schedule, improve the efficiency and accuracy of the pass and schedule design, reduce production costs, accelerate the product development speed, and improve the safety of on-site trial production. Description of the Drawings

[0022] This specification includes the following drawings, and the shown contents are respectively:

[0023] Figure 1 is the flowchart of the hot-rolled C-shaped steel pass and rolling schedule design method based on numerical simulation of the present invention;

[0024] Figure 2 is the schematic cross-sectional view of the guide setting;

[0025] The markings in the figure are:

[0026] 1. Guide section; 2. Blank section; a. Spacing. DETAILED DESCRIPTION

[0027] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitating their implementation.

[0028] like Figure 1 As shown, the present invention provides a hot-rolled C-shaped steel pass profile and rolling schedule design method based on numerical simulation, comprising the following steps:

[0029] S1. Pass profile and rolling procedure design;

[0030] S2, rolling numerical simulation and optimization, to obtain the optimization results;

[0031] S3. In actual production, verify the optimization results.

[0032] Specifically, the present invention applies finite element numerical simulation technology to the design process of the pass and rolling schedule based on the traditional hot-rolled steel pass and rolling schedule design. Through the finite element numerical simulation software, the pass and rolling schedule are verified by full-pass rolling numerical simulation, and the rolling force, product size, bar shape and pass filling of each pass are obtained. Through the numerical simulation results, the pass and rolling schedule are continuously optimized, the efficiency and accuracy of the pass and rolling schedule design are improved, the production cost is reduced, and the product development cycle is shortened.

[0033] In the above step S1, according to the size of the billet and the product, combined with the rolling process principles, the hot-rolled C-shaped steel rolling pass is designed through formula calculation and combined with actual work experience, and the pass matching diagram is designed in combination with the actual production situation. Finally, the design of the rolling process is completed, and the roll gap value, rolling speed and other parameters of each pass are determined.

[0034] In the above step S1, the hot-rolled C-shaped steel is rolled using a near-net-shape profiled blank, using a billet rolling plus a universal rolling method, and designing corresponding billet rolling and universal pass profiles.

[0035] In the above step S2, CAD software is used to draw two-dimensional drawings of the blank and the hole type; Marc Mentat software is used to perform full-pass rolling numerical simulation of the hot-rolled C-shaped steel hole type and procedure, including the import of two-dimensional geometric figures, meshing, three-dimensional entity establishment, material property setting, heat transfer analysis, contact body and contact relationship setting, initial condition setting, boundary condition setting and result output; CAD software is used to analyze the product size; based on the numerical simulation results, the hole type and rolling procedure are preliminarily optimized to obtain the optimization results.

[0036] In the above step S2, the two-dimensional drawing of the blank is first divided into two-dimensional grids according to the curvature of the geometric figure, and then a three-dimensional entity is obtained by expanding the two-dimensional grid.

[0037] In the above step S2, in order to obtain a precise solid mesh for the calculation of the Marc Mentat software and improve the accuracy of the numerical simulation, the two-dimensional drawing is first divided into two-dimensional meshes according to the curvature of the geometric figure, or the two-dimensional figure of the blank is manually divided, and the two-dimensional mesh is adapted according to the degree of deformation of different regions; then the three-dimensional entity is obtained by expanding the two-dimensional mesh. In the expansion parameter setting, in order to ensure the accuracy of the numerical simulation, the length of each expansion shall not be greater than twice the average size of the two-dimensional mesh.

[0038] In the above step S2, corresponding material properties are set according to the composition of the blank used, and the material properties include density, Young's modulus and Poisson's ratio of the blank.

[0039] In the above step S2, the ambient temperature is set to 20-30°C, for example, the ambient temperature is set to 25°C. The heat exchange coefficient between the blank and the external environment is set to 70-90 W / (m 2 ℃), for example, it is set to 80W / (m 2 ℃).

[0040] In the above step S2, the starting rolling temperature of the billet is set to 1200-1300° C., exemplarily, the ambient temperature is set to 1250° C. The final rolling temperature is set to 850-950° C., exemplarily, the ambient temperature is set to 900° C. The surface temperature of the roll is set to 180-220° C., exemplarily, the ambient temperature is set to 200° C.

[0041] In the above step S2, in order to improve the accuracy of rolling simulation, the rolling speed of the billet is controlled by establishing a speed and time function, and the billet bite speed, bite time, rolling speed, rolling time, tail throwing speed and tail throwing time are calculated in combination with the length of the billet. In addition, in order to reflect the control effect of the guide on the billet rolling process in the numerical simulation, a two-dimensional plane is established around the three-dimensional entity of the billet, and there is a certain spacing a between the two-dimensional plane and the three-dimensional entity of the billet. The size of the spacing a is set according to the gap value between the guide and the billet in the actual production process.

[0042] In the above step S3, in actual production, qualified billets are selected and on-site rolling is carried out using the set rolling process parameters; the rolling process of each pass is observed, the rolling force and the strip shape of the rolled piece are recorded for each pass, the surface quality, size and mechanical properties of the finished product are inspected and analyzed, and the hole filling condition is inspected and analyzed; according to the actual production situation and the numerical simulation results, the design scheme of the hole type and the rolling procedure is further optimized until the design requirements are met.

[0043] The above-mentioned hot-rolled C-shaped steel pass profile and rolling procedure design method based on numerical simulation has the following advantages:

[0044] The preliminary design of the hot-rolled C-shaped steel pass and procedures was completed, and the full-pass rolling numerical simulation was carried out. The pass filling, rolled strip shape, product size and rolling force were analyzed, and the pass and procedures were optimized many times. After on-site trial production, the product rolling process was smooth, the pass filling was good, the rolling force was moderate, the product size met the design requirements, and the difference with the numerical simulation results was within the error range.

[0045] The specific implementation modes of the present invention are further explained in detail below through the description of embodiments.

[0046] Example 1

[0047] This embodiment provides a hot-rolled C-shaped steel pass and rolling procedure design method based on numerical simulation, and the specific process is as follows:

[0048] Step S1, pass type and rolling schedule design: The hot-rolled C-shaped steel is rolled with a near-net-shape profiled blank, and the method of blank rolling plus universal rolling is adopted. In combination with the rolling process principle, the hot-rolled C-shaped steel rolling pass type is designed through calculation and practical work experience, and the pass type matching diagram is designed in combination with the actual production situation. Finally, the rolling schedule is designed to determine the roll gap value of each pass, the rolling speed and other parameters;

[0049] Step S2, numerical simulation and optimization of rolling: Use CAD software to draw two-dimensional drawings of the billet and hole type; use Marc Mentat software to perform full-pass rolling numerical simulation of the hot-rolled C-shaped steel hole type and procedures, including the import of two-dimensional geometric figures, meshing, three-dimensional entity establishment, material property setting, heat transfer analysis, contact body and contact relationship setting, initial condition setting, boundary condition setting and result output, among which the ambient temperature is set to 25°C, and the heat transfer coefficient between the billet and the external environment is set to 80W / (m2°C). The starting rolling temperature of the billet is set to 1250°C, the final rolling temperature is set to 900°C, and the roller surface temperature is set to 200°C; use CAD software to analyze the product size; according to the numerical simulation results, the strip shape of the rolled piece in some passes is not good, and there is a serious upward or downward phenomenon after the rolled piece leaves the roller. After optimizing the roller hole type and the roller matching diagram, the strip shape of the rolled piece is effectively improved;

[0050] Step S3, actual production and verification optimization: rolling is carried out on site using corresponding billets, rolling rolls and set rolling process parameters; the rolling process of each pass is observed, the rolling force and rolled piece shape of each pass are measured, the surface quality, size and mechanical properties of the finished product are inspected and analyzed, the hole filling condition is inspected and analyzed, the product rolling process is smooth, the hole filling degree is good, the rolling force is moderate, and the product size meets the design requirements.

[0051] In this embodiment, product dimensions and heating data are shown in Table 1 and Table 2.

[0052] Example 2

[0053] This embodiment provides a method for designing a hot-rolled C-shaped steel hole profile and rolling procedure based on numerical simulation. The process is the same as that of Example 1. The difference between Example 1 and Example 2 lies in the difference in product size and heating data, as shown in Tables 1 and 2.

[0054] Example 3

[0055] This embodiment provides a method for designing a hot-rolled C-shaped steel hole profile and rolling schedule based on numerical simulation. The process is the same as that of Example 1. The difference between Example 1 and Example 3 lies in the difference in product size and heating data, as shown in Tables 1 and 2.

[0056] Example 4

[0057] This embodiment provides a method for designing a hot-rolled C-shaped steel hole profile and rolling procedure based on numerical simulation. The process is the same as that of Example 1. The difference between Example 1 and Example 4 lies in the difference in product size and heating data, as shown in Tables 1 and 2.

[0058] Example 5

[0059] This embodiment provides a method for designing a hot-rolled C-shaped steel hole profile and rolling schedule based on numerical simulation. The process is the same as that of Example 1. The difference between Example 1 and Example 5 lies in the difference in product size and heating data, as shown in Tables 1 and 2.

[0060] Table 1 Billet rolling temperature of the embodiment

[0061]

[0062]

[0063] Table 2 Dimensions of the embodiment (unit: mm)

[0064] Width H Waist thickness d Leg height b Thick legs Example 1 632.2 50.5 66.9 72.6 Example 2 631.8 50.1 69.9 73.1 Example 3 635.5 48.0 68.5 74.5 Example 4 631.7 49.8 67.5 73.5 Example 5 636.6 48.4 68.3 75.4

[0065] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A hot-rolled C-shaped steel pass and rolling schedule design method based on numerical simulation, characterized in that: Includes steps: S1. Pass profile and rolling procedure design; S2, rolling numerical simulation and pass profile optimization to obtain the optimization results; S3. In actual production, verify the optimization results.

2. The method for designing hot-rolled C-shaped steel pass profile and rolling schedule based on numerical simulation according to claim 1, characterized in that: In the step S1, the hot-rolled C-shaped steel is rolled using a near-net-shape profiled blank, using a billet rolling plus a universal rolling method, and designing corresponding billet rolling and universal pass profiles.

3. The method for designing hot-rolled C-shaped steel pass and rolling schedule based on numerical simulation according to claim 1, characterized in that: In the step S2, CAD software is used to draw a two-dimensional drawing of the billet and the hole type; Marc Mentat software is used to perform full-pass rolling numerical simulation of the hot-rolled C-shaped steel hole type and schedule; CAD software is used to analyze the product size; based on the numerical simulation results, the hole type and rolling schedule are preliminarily optimized to obtain the optimization result.

4. The method for designing hot-rolled C-shaped steel pass profile and rolling schedule based on numerical simulation according to claim 3, characterized in that: In the step S2, the two-dimensional drawing of the blank is first divided into two-dimensional grids according to the curvature of the geometric figure, and then a three-dimensional entity is obtained by expanding the two-dimensional grid.

5. The method for designing hot-rolled C-shaped steel pass profile and rolling schedule based on numerical simulation according to claim 3, characterized in that: In the step S2, the two-dimensional figure of the blank is firstly segmented manually, and the two-dimensional grid is divided according to the deformation degree of different regions, and then the three-dimensional entity is obtained by expanding the two-dimensional grid.

6. The method for designing hot-rolled C-shaped steel pass profile and rolling schedule based on numerical simulation according to claim 4 or 5, characterized in that: In step S2, in the expansion parameter setting, the length of each expansion shall not be greater than twice the average size of the two-dimensional grid.

7. The method for designing hot-rolled C-shaped steel pass profile and rolling schedule based on numerical simulation according to any one of claims 1 to 6, characterized in that: In the step S2, corresponding material properties are set according to the composition of the blank used, and the material properties include density, Young's modulus and Poisson's ratio of the blank.

8. The method for designing hot-rolled C-shaped steel pass profile and rolling schedule based on numerical simulation according to claim 7, characterized in that: In step S2, the ambient temperature is set to 20-30°C, and the heat exchange coefficient between the blank and the external environment is set to 70-90 W / (m 2 ℃).

9. The method for designing hot-rolled C-shaped steel pass profile and rolling schedule based on numerical simulation according to claim 7, characterized in that: In step S2, the starting rolling temperature of the billet is set to 1200-1300°C, the final rolling temperature is set to 850-950°C, and the surface temperature of the rolling roller is set to 180-220°C.

10. The method for designing hot-rolled C-shaped steel pass profile and rolling schedule based on numerical simulation according to any one of claims 1 to 9, characterized in that: In the step S3, in actual production, qualified billets are selected and on-site rolling is carried out using the set rolling process parameters; the rolling process of each pass is observed, the rolling force and the strip shape of the rolled piece are recorded for each pass, the surface quality, size and mechanical properties of the finished product are inspected and analyzed, and the hole filling condition is inspected and analyzed; according to the actual production situation and the numerical simulation results, the design scheme of the hole type and the rolling procedure is further optimized.

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