A method of rolling 22MNB5 on a cold rolling mill

Abstract

The application discloses a cold rolling mill 22MNB5 rolling method, through reasonable reduction and unit tension control, the product surface is smooth and flat, and no obvious defects are generated; through scientific rolling parameter setting, the product can meet the thickness requirement, has excellent mechanical properties, and can bear higher stress and deformation; the rolling method simplifies the technological process, improves the production efficiency, and reduces the production cost. The cold rolling mill 22MNB5 rolling method has wide application prospect and commercial value by optimizing the rolling parameters and process control, and significantly improving the surface quality and mechanical properties of the product.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of rolling process of metal materials, and particularly relates to a 22MNB5 rolling method of a cold rolling mill. BACKGROUND

[0002] 22MNB5 steel is a high-strength low-alloy steel, has good mechanical properties and weldability, and is widely used in the fields of automobile manufacturing, mechanical engineering and the like. How to control the rolling parameters in the cold rolling process to ensure that the final product of the 22MNB5 steel has excellent surface quality and mechanical properties is an important research topic in the current technical field. SUMMARY

[0003] The application aims to provide a 22MNB5 rolling method of a cold rolling mill, which makes the product have excellent surface quality and mechanical properties by optimizing the rolling parameters.

[0004] To solve the above technical problems, the application adopts the following technical scheme:

[0005] The 22MNB5 rolling method of the cold rolling mill comprises the following steps:

[0006] 1) Raw material preparation

[0007] The 22MNB5 steel raw material meeting the standard is selected;

[0008] 2) Determination of rolling process parameters

[0009] According to the material properties, the reasonable rolling process parameters are determined to ensure the uniform deformation of the material and the surface quality in the rolling process;

[0010] 3) Rolling step

[0011] Total reduction rate 57.2%: the raw material is rolled in multiple passes, and the total reduction rate is controlled to be 57.2%;

[0012] F1 rack reduction 20%: in the first rolling process, the material thickness is reduced by 20%;

[0013] F2 rack reduction 20.3%: in the second rolling process, the material thickness is reduced by 20.3%;

[0014] F3 rack reduction 20.2%: in the third rolling process, the material thickness is reduced by 20.2%;

[0015] F4 rack reduction 14.7%: in the fourth rolling process, the material thickness is reduced by 14.7%;

[0016] F5 stand reduction 1.5%: in the last rolling process, the material thickness is reduced by 1.5% to ensure the final thickness and surface flatness;

[0017] 4) Unit tension control

[0018] In the rolling process, the unit tension of each stand is controlled, and the specific parameters are as follows:

[0019] F1 stand: 5.1 (10N / mm²);

[0020] F2 stand: 13 (10N / mm²);

[0021] F3 stand: 13.5 (10N / mm²);

[0022] F4 stand: 14.5 (10N / mm²);

[0023] F5 stand: 15.4 (10N / mm²);

[0024] Discharge end: 5.2 (10N / mm²);

[0025] 5) Work roll bending control

[0026] To ensure the flatness in the rolling process, the work roll bending is 18-21 (10KN / ch);

[0027] 6) Rolling force control

[0028] On different rolling stands, the rolling force is controlled, and the specific parameters are as follows:

[0029] F1 stand: 1400 tons;

[0030] F2 stand: 1450 tons;

[0031] F3 stand: 1350 tons;

[0032] F4 stand: 1250 tons;

[0033] F5 stand: 550 tons.

[0034] Further, the step 1) further comprises: pretreating the selected 22MNB5 steel raw material, including surface cleaning, preheating and other steps, to ensure the uniformity and stability of the material in the rolling process.

[0035] Further, in the rolling process, the thickness, surface quality and mechanical properties of the material are monitored in real time to ensure that the material meets the expected technical requirements after each rolling process.

[0036] Further, after rolling is completed, surface treatment and quality inspection are performed on the finished product to ensure that the finished product meets relevant standards and user requirements.

[0037] Further, the rolling method simplifies the process flow, improves production efficiency, and reduces production cost.

[0038] Compared with the prior art, the beneficial technical effects of the present application are:

[0039] The cold rolling mill 22MNB5 rolling method provided by the present application significantly improves the surface quality and mechanical properties of the product by optimizing the rolling parameters and process control, and has the following advantages:

[0040] 1. Excellent surface quality

[0041] Through reasonable reduction and unit tension control, the product surface is smooth and flat without obvious defects.

[0042] 2. Stable mechanical properties

[0043] Through scientific rolling parameter setting, the product meets the thickness requirement while having excellent mechanical properties, and can withstand high stress and deformation.

[0044] 3. High production efficiency

[0045] The rolling method of the present application simplifies the process flow, improves production efficiency, and reduces production cost.

[0046] The cold rolling mill 22MNB5 rolling method of the present application significantly improves the surface quality and mechanical properties of the product by optimizing the rolling parameters and process control, and has wide application prospect and commercial value. BRIEF DESCRIPTION OF DRAWINGS

[0047] The present application will be further described below in conjunction with the drawings.

[0048] Figure 1 The above icons can effectively reflect the practicability of this rolling method.

[0049] Figure 2 The above icons can effectively reflect the calculation process and reduction distribution ratio of this rolling method. DETAILED DESCRIPTION

[0050] A cold rolling mill 22MNB5 rolling method, comprising the following steps:

[0051] 1. Raw material preparation

[0052] Select 22MNB5 steel raw material that meets the standard.

[0053] 2. Rolling process parameter determination

[0054] According to the characteristics of the raw material, reasonable rolling process parameters are determined to ensure uniform deformation and surface quality of the material during rolling.

[0055] 3. Rolling step

[0056] Total reduction rate 57.2%: The raw material is rolled in multiple passes, with the total reduction rate controlled at 57.2%.

[0057] F1 stand reduction 20%: In the first rolling process, the material thickness is reduced by 20%.

[0058] F2 stand reduction 20.3%: In the second rolling process, the material thickness is reduced by 20.3%.

[0059] F3 stand reduction 20.2%: In the third rolling process, the material thickness is reduced by 20.2%.

[0060] F4 stand reduction 14.7%: In the fourth rolling process, the material thickness is reduced by 14.7%.

[0061] F5 stand reduction 1.5%: In the last rolling process, the material thickness is reduced by 1.5% to ensure the final thickness and surface flatness.

[0062] 4. Unit tension control

[0063] During rolling, the unit tension of each stand is controlled, with the specific parameters as follows:

[0064] F1 stand: 5.1 (10 N / mm²)

[0065] F2 stand: 13 (10 N / mm²)

[0066] F3 stand: 13.5 (10 N / mm²)

[0067] F4 stand: 14.5 (10 N / mm²)

[0068] F5 stand: 15.4 (10 N / mm²)

[0069] Discharge end: 5.2 (10 N / mm²)

[0070] 5. Work roll bending control

[0071] To ensure flatness during rolling, the work roll bending is controlled at 18-21 (10 KN / ch).

[0072] 6. Rolling force control

[0073] On different rolling stands, the rolling force is controlled, with specific parameters as follows:

[0074] F1 stand: 1400 tons

[0075] F2 stand: 1450 tons

[0076] F3 stand: 1350 tons

[0077] F4 stand: 1250 tons

[0078] F5 stand: 550 tons. Example

[0079] 1. Raw material processing

[0080] The selected 22MNB5 steel raw materials are pretreated, including surface cleaning, preheating, etc., to ensure the uniformity and stability of the materials during rolling.

[0081] 2. Rolling parameter setting

[0082] The above rolling parameters, including reduction, unit tension, bending force and rolling force, are set on the rolling equipment to ensure that the equipment rolls according to the set parameters.

[0083] 3. Rolling process control

[0084] During the rolling process, the thickness, surface quality and mechanical properties of the material are monitored in real time to ensure that the material meets the expected technical requirements after each rolling process.

[0085] 4. Finished product processing

[0086] After rolling, the finished product is surface treated and quality inspected to ensure that the finished product meets the relevant standards and user requirements.

Claims

1. A cold rolling method of 22MNB5 steel, characterized in that, The method comprises the following steps: 1) raw material preparation Selecting 22MNB5 steel raw materials that meet the standards; 2) determination of rolling process parameters According to the characteristics of the raw materials, reasonable rolling process parameters are determined to ensure uniform deformation and surface quality of the materials during rolling; Rolling steps: Total reduction rate 57.2%: the raw materials are rolled in multiple passes, and the total reduction rate is controlled at 57.2%; F1 stand reduction 20%: in the first rolling process, the material thickness is reduced by 20%; F2 stand reduction 20.3%: in the second rolling process, the material thickness is reduced by 20.3%; F3 stand reduction 20.2%: in the third rolling process, the material thickness is reduced by 20.2%; F4 stand reduction 14.7%: in the fourth rolling process, the material thickness is reduced by 14.7%; F5 stand reduction 1.5%: in the last rolling process, the material thickness is reduced by 1.5% to ensure the final thickness and surface flatness; Unit tension control: During rolling, the unit tension of each stand is controlled, and the specific parameters are as follows: F1 stand: 5.1×10 N / mm²; F2 stand: 13×10 N / mm²; F3 stand: 13.5×10 N / mm²; F4 stand: 14.5×10 N / mm²; F5 stand: 15.4×10 N / mm²; Discharge end: 5.2×10 N / mm²; Work roll bending control: To ensure the flatness during rolling, the work roll bending is controlled at 180 KN / ch-210 KN / ch; Rolling force control: On different rolling stands, the rolling force is controlled, and the specific parameters are as follows: F1 stand: 1400 tons; F2 stand: 1450 tons; F3 stand: 1350 tons; F4 stand: 1250 tons; F5 stand: 550 tons.

2. The cold rolling method of 22MNB5 steel according to claim 1, characterized in that, The step 1) further comprises: pretreating the selected 22MNB5 steel raw materials, including surface cleaning and preheating steps, to ensure the uniformity and stability of the materials during rolling.

3. The cold rolling method of 22MNB5 steel according to claim 1, characterized in that, During rolling, the thickness, surface quality and mechanical properties of the materials are monitored in real time to ensure that the materials meet the expected technical requirements after each rolling process.

4. The cold rolling method of 22MNB5 steel according to claim 1, characterized in that, After rolling, the finished products are surface treated and quality inspected to ensure that the finished products meet the relevant standards and user requirements.

Images