A digital design method for high-speed wire rod rollers

Abstract

The present invention discloses a digital design method for high-speed wire rod rollers. The method calculates the roller neck diameter that meets the strength requirements through the initial fillet, and judges whether the obtained roller neck diameter meets the compactness requirements based on the ratio of the roller neck diameter to the roller body diameter, thereby adjusting the excessive fillet and performing iterative calculation. The method optimizes the roller design method of the high-speed wire rod rolling mill through the steps of initial value assignment, result judgment, iterative calculation, etc., and ensures that the mechanical properties of the roller meet the requirements of high-speed rolling without increasing the roller neck diameter. It also ensures that the strength of the roller meets the requirements of continuous and stable production without increasing the weight of the equipment and ensuring the compactness of the production line.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical industry production equipment, and in particular to a digital design method for a high-speed wire roller. Background Art

[0002] Rods and wire rods are widely used in various industrial production and construction sectors. After years of development, the rolling speed of high-speed wire rod has increased from 40-50 meters per second in the early days to over 120 meters per second today. China, currently the world's largest producer of wire rod, has an annual wire rod production capacity exceeding 80 million tons and owns more than half of the world's rolling mills. However, due to the late start of research in high-speed wire rod mills in my country, most of these mills are still imported from abroad, resulting in high material procurement and production costs.

[0003] With the gradual increase in the production proportion of high-end wire rods and special wire rods such as bearing steel, spring steel, and steel cord, higher requirements are placed on the roll stiffness and strength of high-speed wire rod rolling mills. As a stepped shafting part, the roll neck and roll body have a large diameter difference. According to the bending stress formula of circular cross-section parts, It can be seen that the bending stress is not only linearly related to the magnitude of the bending moment, but also gradually decreases with the increase of the diameter of the part.

[0004] Based on design experience, the maximum bending stress of a roll typically occurs at the junction of the roll neck and the roll body. Increasing the roll neck diameter can reduce this maximum bending stress and improve roll strength, but this also increases the size of components such as the roll bearings, bearing seats, and arches, increasing equipment weight and making the equipment layout less compact.

[0005] In order to avoid roll neck fracture accidents during rolling of high-speed wire rod mills and ensure the compactness of the high-speed wire rod production line, it is necessary to ensure that the safety factors of each part meet the standards at the beginning of the roll design to meet the requirements of continuous and stable production. Summary of the Invention

[0006] The purpose of the present invention is to provide a digital design method for high-speed wire rod rollers, which can ensure that the strength of the rollers meets the requirements of continuous and stable production without increasing the weight of the equipment and ensuring the compactness of the production line, so as to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A digital design method for a high-speed wire rod roller comprises the following steps:

[0009] S1: Initial value assignment: Calculate the roll neck diameter that meets the strength requirements through the initial fillet;

[0010] S2: Result determination: Determine whether the obtained roll neck diameter meets the compactness requirement based on the ratio of the roll neck diameter to the roll body diameter;

[0011] S3: Iterative calculation: After adjusting the excessive fillet, iteratively calculate the mechanical properties of the roll to meet the requirements of high-speed rolling.

[0012] Furthermore, the roller is a roller with a grooved roller body and a hole pattern, and the roller bearings are located at the roller neck with a diameter of d at both ends of the roller, wherein the grooved roller body has three holes of different diameters arranged in sequence at equal intervals from left to right.

[0013] Furthermore, when the workpiece is located in the operating side slot, the support reaction force at the roller bearing satisfies the equation:

[0014]

[0015] Among them, F1 is the support reaction force of the transmission side bearing seat, F2 is the support reaction force of the operating side bearing seat, L is the length of the roller body, L a is the roll neck width, L b is the hole-slot spacing, R is the shoulder chamfer, and P is the rolling force.

[0016] Furthermore, when the workpiece is located in the middle hole groove, the support reaction force at the roller bearing satisfies the equation:

[0017]

[0018] Furthermore, when the workpiece is located in the transmission side slot, the support reaction force at the roller bearing satisfies the equation:

[0019]

[0020] Furthermore, the dangerous section of the roll is located at the junction of the roll neck and the roll body.

[0021] Furthermore, when the roll material is cast steel, the synthetic stress is:

[0022]

[0023] Furthermore, when the roll material is a cast iron roll, the resultant stress is:

[0024]

[0025] Among them, the gray cast iron μ'=0.25, and the ductile cast iron μ'=0.30.

[0026] Furthermore, the neck diameter of the roll satisfies the following equation:

[0027]

[0028] Where d is the neck diameter of the roll, σ b is the tensile strength of the roll, n is the safety factor of the roll, M F is the bending moment of the dangerous section, M e is the rolling torque.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention provides a digital design method for high-speed wire rod rollers. The method calculates the roller neck diameter that meets the strength requirements through the initial fillet, and judges whether the obtained roller neck diameter meets the compactness requirements based on the ratio of the roller neck diameter to the roller body diameter, thereby adjusting the excessive fillet and performing iterative calculations. The method optimizes the roller design method for high-speed wire rod rolling mills through several steps, including initial value assignment, result judgment, and iterative calculation. It ensures that the mechanical properties of the roller meet the requirements of high-speed rolling without increasing the roller neck diameter, and ensures that the strength of the roller meets the requirements of continuous and stable production without increasing the weight of the equipment and ensuring the compactness of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the force applied to the rollers when the rolled piece is located at the transmission side pass;

[0032] Figure 2 This is a schematic diagram of the force applied to the rollers when the rolled piece is located at the middle pass of the present invention;

[0033] Figure 3 This is a schematic diagram of the force applied to the rolls when the rolled piece is located at the operating side pass;

[0034] Figure 4 Flowchart for the digital design of the rollers of the present invention;

[0035] Figure 5 This is the roll digital design toolbox - roll design interface diagram of the present invention;

[0036] Figure 6 This is the roll digital design toolbox - roll calibration interface diagram of the present invention. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] See also Figure 1-4In an embodiment of the present invention, a digital design method for a high-speed wire rod roller comprises the following steps:

[0039] Step 1: Initial value assignment: Calculate the roll neck diameter that meets the strength requirements through the initial fillet;

[0040] Step 2: Result determination: Determine whether the obtained roll neck diameter meets the compactness requirement based on the ratio of the roll neck diameter to the roll body diameter;

[0041] Step 3: Iterative calculation: After adjusting the excessive fillet, iterative calculation is performed to determine the mechanical properties of the roll to meet the requirements of high-speed rolling.

[0042] The roller is a roller with a grooved body and a hole pattern, and the roller bearings are located at the roller neck with a diameter of d at both ends of the roller. The grooved roller body has three holes of different diameters arranged in sequence at equal intervals from left to right.

[0043] When the workpiece is located in the operating side slot, the reaction force at the roller bearing satisfies the equation:

[0044]

[0045] Among them, F1 is the support reaction force of the transmission side bearing seat, F2 is the support reaction force of the operating side bearing seat, L is the length of the roller body, L a is the roll neck width, L b is the hole-slot spacing, R is the shoulder chamfer, and P is the rolling force.

[0046] When the workpiece is located in the middle groove, the reaction force at the roller bearing satisfies the equation:

[0047]

[0048] When the workpiece is located in the transmission side slot, the reaction force at the roller bearing satisfies the equation:

[0049]

[0050] In the above embodiment, the dangerous section of the roll is located at the junction of the roll neck and the roll body.

[0051] When the roll is made of cast steel, the composite stress is:

[0052]

[0053] When the roll material is cast iron roll, the composite stress is:

[0054]

[0055] Among them, the gray cast iron μ'=0.25, and the ductile cast iron μ'=0.30.

[0056] The neck diameter of the roll in the embodiment of the present invention satisfies the following equation:

[0057]

[0058] Where d is the neck diameter of the roll, σ b is the tensile strength of the roll, n is the safety factor of the roll, M F is the bending moment of the dangerous section, M e is the rolling torque.

[0059] In summary, the present invention calculates the roll neck diameter that meets the strength requirements through the initial fillet, and judges whether the obtained roll neck diameter meets the compactness requirement based on the ratio of the roll neck diameter to the roll body diameter, thereby adjusting the excessive fillet and performing iterative calculation. Through the steps of initial value assignment, result judgment, iterative calculation, etc., the roll design method of the high-speed wire rolling mill is optimized, and the mechanical properties of the roll are guaranteed to meet the requirements of high-speed rolling without increasing the roll neck diameter. It also ensures that the strength of the roll meets the requirements of continuous and stable production without increasing the weight of the equipment and ensuring the compactness of the production line.

[0060] In order to further better explain the embodiments of the present invention, the following specific cases are provided:

[0061] See also Figure 5 This is the roll design module in the roll digital design toolbox; its rolling process parameters are: rolling force P = 2800kN, rolling torque M = 250kN·m, hole-slot spacing L b =205mm; Roller related dimensions: Roller length L = 760mm, Roller diameter D = 550mm, Roller neck length L a =210mm. Cast steel rollers are used, and their tensile strength σ b =550MPa. According to the digital iterative calculation of the present invention, the roll neck diameter d=267mm and the roll neck / roller body transition radius R=36mm are finally calculated.

[0062] See also Figure 6 This is the roll calibration module in the roll digital design toolbox; its rolling process parameters are: rolling force P = 3200kN, rolling torque M = 250kN·m, hole-slot spacing L b =175mm; the designed roll size is: roll body length L = 760mm, roll body diameter D = 550mm, roll neck length L a =210mm, roller neck diameter d = 280mm, transition radius R = 35mm. Cast steel roller is used, and its tensile strength σ b =550MPa. After verification and calculation, the stress at the dangerous section is σ max=169.043MPa, the corresponding safety factor n=3.2536, the safety factor n of the roller is greater than 3, which ensures that the strength of the roller can meet the requirements of continuous and stable production.

[0063] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A digital design method for high-speed wire rod rollers, characterized in that: The roller is a roller with a grooved roller body and a hole profile, and the roller bearings are located at the roller necks with a diameter of d at both ends of the roller. The grooved roller body has three holes of different diameters arranged in sequence at equal intervals from left to right, including the following steps: S1: Initial value assignment: roller surface diameter D, initial fillet R, and then calculate the support reaction force F and bending moment M F , composite stress P , and finally calculate the roller neck diameter d that meets the strength requirements; S2: Result judgment: According to the ratio of the roll neck diameter d to the roll surface diameter D, it is judged whether the roll neck diameter d meets the compactness requirement. If the ratio is less than 0.5, the roll neck diameter d meets the compactness requirement; if the ratio is not less than 0.5, R i+1 =R i +0.5, return to the initial fillet R and recalculate; S3: Iterative calculation: After adjusting the transition radius, iterative calculation is performed to determine whether the mechanical properties of the roll meet the requirements of high-speed rolling.

2. A digital design method for a high-speed wire rod roller according to claim 1, characterized in that: When the roller is located in the operating side slot, the support reaction force at the roller bearing satisfies the equation: （1） in, F 1 is the support reaction force of the transmission side bearing seat, F 2 is the support reaction force of the operating side bearing seat, L is the roller length, L a is the roll neck width, L b is the hole-slot spacing, R For the shaft shoulder chamfer, P is the rolling force.

3. A digital design method for a high-speed wire rod roller according to claim 2, characterized in that: When the roller is located in the middle hole groove, the support reaction force at the roller bearing satisfies the equation: （2）。 4. A digital design method for a high-speed wire rod roller according to claim 3, characterized in that: When the roller is located in the transmission side slot, the support reaction force at the roller bearing satisfies the equation: （3）。 5. A digital design method for a high-speed wire rod roller according to claim 4, characterized in that: The dangerous section of the roll is located at the junction of the roll neck and the roll body.

6. A digital design method for a high-speed wire rod roller according to claim 5, characterized in that: When the roll material is cast steel, the synthetic stress is: (4)。 7. A digital design method for a high-speed wire rod roller according to claim 5, characterized in that: When the roll material is cast iron roll, the composite stress is: (5) Among them, gray cast iron =0.25, ductile iron =0.

30.

8. A digital design method for a high-speed wire rod roller according to claim 5, characterized in that: The neck diameter of the roll satisfies the following equation: (6) Where, d is the neck diameter of the roll, σ b is the tensile strength of the roll, n is the safety factor of the roll, M F is the bending moment of the dangerous section, M e is the rolling torque.

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