Method for manufacturing high-strength wear-resistant bearing

Abstract

The present invention relates to the field of alloy steel materials, and in particular to a method for manufacturing a high-strength wear-resistant bearing. By incorporating a controllable medium composite structure treatment step into a process, and using metal material modification technology in a controllable medium environment, a composite structure is formed in a product matrix; the composite structure, by means of a gradient distribution, enables the product to achieve high core strength and impact resistance and high surface hardness and wear resistance, so that a service life of 500 hours under low-speed heavy-load service conditions and a friction coefficient of 0.05 or below throughout the entire life cycle are achieved; the service life of 500 hours under the service conditions greatly reduces bushing replacement frequency and device production downtime losses, and the friction coefficient of 0.05 or below throughout the entire life cycle greatly reduces the wear on a friction pair mating with a shaft hole, mitigating sliding friction, achieving the objective of prolonging the service life of both a bushing and a shaft mating with the bushing.

Description

Preparation method of high-strength wear-resistant bearing TECHNICAL FIELD

[0001] The present application relates to the field of alloy steel materials, in particular to a preparation method of high-strength wear-resistant bearing. BACKGROUND

[0002] Bearing is an important part indispensable in modern mechanical equipment, its main function is to support the mechanical rotating body, reduce the friction coefficient in its movement process, and ensure the rotation accuracy. During use, due to the need to withstand periodic load for a long time, poor lubrication or harsh working environment, etc., surface wear is prone to occur, which causes size change, affects the service life of the bearing, and increases the maintenance cost of the equipment. Therefore, it is necessary to improve the strength and wear resistance of the bearing, and thus improve the service life of the bearing.

[0003] The existing products generally adopt conventional heat treatment process, and the Chinese invention patent with the authorization announcement number CN113430462B discloses a high-strength corrosion-resistant low-carbon alloy steel and a preparation method thereof, by adjusting and controlling the chemical element composition of raw materials and the mass percentage thereof, and strictly controlling quenching and tempering and cooling mode, the strength and corrosion resistance of the low-carbon alloy steel are improved. But the heat treatment process is still prone to product matrix hardness fluctuation, uneven surface hardness, soft spots, which leads to product not wear-resistant, short service life, and also affects the service life of the shaft body matched therewith. SUMMARY

[0004] Technical purpose: in order to overcome the deficiencies in the prior art, the present application provides a preparation method of high-strength wear-resistant bearing, which realizes high strength of product core, impact resistance, high surface hardness and wear resistance.

[0005] Technical scheme: in order to achieve the above purpose, the present application discloses a preparation method of high-strength wear-resistant bearing, comprising the following steps:

[0006] S1: raw material preparation, according to the shape structure of sliding bearing, different specifications of products are designed, and the products are cut into shape or forged into shape according to the product length, forming a blank, the raw material is low-carbon alloy steel;

[0007] S2: pre-processing, the blank is pretreated, and the shape of the blank is adjusted according to the size of the sliding bearing, all the sizes except the outer circle and the inner hole are processed to the finished product state, and the outer circle and the inner hole size are processed to the semi-finished product state in this process;

[0008] S3: heat treatment, the product obtained in step S2 is quenched at 850-950 DEG C and tempered at 650-950 DEG C, to obtain 100% S structure on the surface, and the grain size is greater than or equal to 5 levels;

[0009] S4: finish machining, according to the design requirements of the sliding bearing, the outer circle and the inner hole size are finely ground, processed to the finished size, and the initial bearing is obtained;

[0010] S5: controllable medium composite organization treatment, the controllable medium includes gas medium and liquid medium, the gas medium includes CO, H2 and N2, and the liquid medium includes K2CO3, Na2CO3, NaCNO, Pr and Nd.

[0011] Further, the percentage of the gas medium is: CO 15-20%, H2 40-45%, N2 35-45%; the percentage of the liquid medium is: K2CO3 30-40%, Na2CO3 42-50%, NaCNO 17-28%, trace Pr, trace Nd.

[0012] Further, the percentage of the gas medium is: CO 18%, H2 42%, N2 40%; the percentage of the liquid medium is: K2CO3 32%, Na2CO3 48%, NaCNO 19%, trace Pr, trace Nd.

[0013] Further, the controllable medium composite organization treatment includes the following steps:

[0014] S51: gas medium treatment, the initial bearing is placed in the gas medium, the temperature is controlled at 800-900 DEG C, and is maintained for 10-20 hours;

[0015] S52: liquid medium treatment, the initial bearing after the gas medium treatment is placed in the liquid medium, the temperature is controlled at 500-600 DEG C, and is maintained for 2-4 hours;

[0016] The obtained high-strength wear-resistant bearing composite organization component is: S+C+Fe2N+Fe3N+Fe4N.

[0017] Further, in the step S51, the temperature is 830-850 DEG C, and is maintained for 15 hours; in the step S52, the temperature is 545-560 DEG C, and is maintained for 3 hours.

[0018] Further, the low-carbon alloy steel includes the following mass percentage of each component: C 0.17-0.23%, Si 0.15-0.37%, Mn 0.55-0.95%, S≤0.035%, P≤0.035, Cr 0.30-0.70%, Ni 0.45-0.80%, Cu≤0.03%, Mo 0.15-0.30%, Ti 0.04-0.10%, and the rest is Fe and inevitable impurities.

[0019] The preparation method of the high-strength wear-resistant bearing has at least the following technical effects:

[0020] The present application adds a controllable medium composite organization processing step in the process, and through metal material modification technology in the controllable medium environment, the product matrix forms a composite organization. The composite organization realizes the 500-hour service life under the GB / T23894 low-speed heavy-duty bench test condition and the friction coefficient of 0.05 or less in the whole life cycle through the gradient distribution, the 500-hour service life under the bench test condition greatly reduces the replacement frequency of the shaft sleeve and the equipment production loss, and the friction coefficient of 0.05 or less in the whole life cycle greatly improves the wear degree of the friction pair of the shaft hole cooperation, relieves the sliding friction strength, and prolongs the service life of the shaft sleeve and the shaft body matched therewith. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is a microstructure diagram of the high-strength wear-resistant bearing after 500 times magnification;

[0022] Fig. 2 is a friction coefficient comparison chart of the high-strength wear-resistant bearing of different process schemes. Embodiment of the present application

[0023] The principles and characteristics of the present application are described below in combination with the drawings, and the examples are only used to explain the present application and are not used to limit the scope of the present application.

[0024] Embodiment 1: A preparation method of a high-strength wear-resistant bearing, the raw material is low-carbon alloy steel, the low-carbon alloy steel includes the following components with mass percentage: C 0.20%, Si 0.3%, Mn 0.70%, S 0.030%, P 0.030%, Cr 0.50%, Ni 0.55%, Cu 0.02%, Mo 0.20%, Ti 0.07%, and the rest is Fe and inevitable impurities. The wear-resistant bearing is prepared according to the following steps:

[0025] S1: blanking of raw materials, according to the shape structure of the sliding bearing, the product raw materials of different specifications are designed, and the product length is cut or forged into shape to form a blank;

[0026] S2: pre-processing, the blank is pretreated, and the shape of the blank is adjusted according to the size of the sliding bearing. All the sizes except the outer circle and the inner hole are processed to the finished product state, and the outer circle and the inner hole size are processed to the semi-finished product state in this process;

[0027] S3: heat treatment, the product obtained in the step S2 is quenched at 850-950 DEG C and tempered at 650-950 DEG C, so that the surface 100% S organization is obtained, and the grain size is greater than or equal to 5 levels.

[0028] S4: finish machining, according to the design requirements of the sliding bearing, the outer circle and the inner hole size are finely ground, processed to the finished size, and the initial bearing is obtained.

[0029] Examples 2-5: referring to the low-carbon alloy steel components and heat treatment methods in Example 1, the obtained initial bearing is processed as follows:

[0030] S5: controllable medium composite structure treatment, the controllable medium includes gas medium and liquid medium, the gas medium includes CO, H2 and N2, and the liquid medium includes K2CO3, Na2CO3, NaCNO, trace Pr and trace Nd. Each gas medium and liquid medium is adjusted, and a plurality of examples are carried out, and the specific parameters of each example are shown in Table 1.

[0031] Table 1: test parameters of Examples 2-5

[0032]

[0033] According to the parameters in each example, the initial bearing is processed as follows:

[0034] S51: gas medium treatment, the initial bearing is placed in the gas medium, the temperature is controlled at 850°C, and the holding time is 15 hours;

[0035] S52: liquid medium treatment, the initial bearing treated by the gas medium is placed in the liquid medium, the temperature is controlled at 560°C, and the holding time is 3 hours.

[0036] The test results of the properties of the final products obtained in Examples 1-5 are shown in Table 2, and Figure 2 also shows a comparison chart of the friction coefficients of the high-strength wear-resistant bearings in Examples 1-5.

[0037] Table 2: test results of Examples 1-5

[0038]

[0039] Example 6: referring to the parameters of Example 5, the temperature and time of controllable medium treatment are adjusted, and the specific parameters are as follows:

[0040] S51: gas medium treatment, the initial bearing is placed in the gas medium, the temperature is controlled at 800°C, and the holding time is 20 hours;

[0041] S52: liquid medium treatment, the initial bearing treated by the gas medium is placed in the liquid medium, the temperature is controlled at 500°C, and the holding time is 4 hours.

[0042] Example 7: Refer to the parameters of Example 5, adjust the temperature and time of controllable medium treatment, as follows:

[0043] S51: Gas medium treatment, place the initial bearing in the gas medium, control the temperature at 900℃, and keep for 10 hours;

[0044] S52: Liquid medium treatment, place the initial bearing in the gas medium after the gas medium treatment in the liquid medium, control the temperature at 600℃, and keep for 2 hours.

[0045] Example 8: Refer to the parameters of Example 5, adjust the temperature and time of controllable medium treatment, as follows:

[0046] S51: Gas medium treatment, place the initial bearing in the gas medium, control the temperature at 830℃, and keep for 10 hours;

[0047] S52: Liquid medium treatment, place the initial bearing in the gas medium after the gas medium treatment in the liquid medium, control the temperature at 545℃, and keep for 2 hours.

[0048] The performance test results of the final products obtained in Example 6-Example 8 are shown in Table 3:

[0049] Table 3: Test results of Example 6-Example 8

[0050]

[0051] Example 9: Refer to the parameters of Example 5, adjust the mass percentage of each component of low-carbon alloy steel, as follows:

[0052] C 0.17%, Si 0.15%, Mn 0.55%, S 0.030%, P 0.030%, Cr 0.30%, Ni 0.45%, Cu 0.02%, Mo 0.15%, Ti 0.04%, and the rest is Fe and inevitable impurities.

[0053] Example 10: Refer to the parameters of Example 5, adjust the mass percentage of each component of low-carbon alloy steel, as follows:

[0054] C 0.23%, Si 0.37%, Mn 0.95%, S 0.035%, P 0.035%, Cr 0.70%, Ni 0.80%, Cu 0.03%, Mo 0.30%, Ti 0.10%, and the rest is Fe and inevitable impurities.

[0055] The performance test results of the final products obtained in Example 9 and Example 10 are shown in Table 4:

[0056] Table 4: Test results of Example 9-Example 10

[0057]

[0058] By comparing the test results of Example 1 with Example 2-Example 10, it can be seen that by controlling the composition system and processing technology of each gas medium and liquid medium in the process of treating the initial bearing with controllable medium composite organization, a bearing product with high strength and high wear resistance can be finally obtained. Through the metal material modification technology in the controllable medium environment, the product matrix forms a composite organization, and the composition of the composite organization is S+C+Fe2N+Fe3N+Fe4N+nanomolecule. As shown in FIG. 1, it is the microstructure diagram of the high-strength wear-resistant bearing obtained by Example 5 of the present application after 500 times magnification. The composite organization makes the product core have high strength and impact resistance, and the surface has high hardness and wear resistance, so that the service life of 500 hours under the condition of low-speed heavy-load bench test and the friction coefficient of 0.05 or less in the whole life cycle can be realized.

[0059] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method of making a high-strength, wear-resistant bearing, characterized by, It comprises the following steps: S1: blanking of raw material, different specifications of products are designed according to the shape structure of sliding bearing, and the products are cut or forged into shape according to the length of the products to form a blank, and the raw material is low-carbon alloy steel; S2: pre-processing, the blank is pretreated, and the shape of the blank is adjusted according to the size of the sliding bearing, and all sizes except the outer circle and the inner hole are processed to the finished product state, and the outer circle and the inner hole size are processed to the semi-finished product state in this process; S3: heat treatment, the product obtained in step S2 is quenched at 850-950 DEG C and tempered at 650-950 DEG C, and the surface 100% S structure is obtained, and the grain size is greater than or equal to 5 levels; S4: finishing, according to the design requirements of the sliding bearing, the outer circle and the inner hole size are finished to the finished product size to obtain the initial bearing; S5: controllable medium composite structure treatment, the controllable medium includes gas medium and liquid medium, the gas medium includes CO, H2 and N2, and the liquid medium includes K2CO3, Na2CO3, NaCNO, Pr and Nd.

2. The method of claim 1, wherein the high-strength wear-resistant bearing is prepared by the steps of: The percentage of the gas medium is: CO 15-20%, H2 40-45%, N2 35-45%; the percentage of the liquid medium is: K2CO3 30-40%, Na2CO3 42-50%, NaCNO 17-28%, trace Pr, trace Nd.

3. A method of making a high-strength, wear-resistant bearing according to claim 2, wherein, The percentage of the gas medium is: CO 18%, H2 42%, N2 40%; the percentage of the liquid medium is: K2CO3 32%, Na2CO3 48%, NaCNO 19%, trace Pr, trace Nd.

4. A method of making a high-strength, wear-resistant bearing according to claim 2 or 3, characterized in that, The controllable medium composite structure treatment comprises the following steps: S51: gas medium treatment, the initial bearing is placed in the gas medium, the temperature is controlled at 800-900 DEG C, and the initial bearing is kept for 10-20 hours; S52: liquid medium treatment, the initial bearing treated by the gas medium is placed in the liquid medium, the temperature is controlled at 500-600 DEG C, and the initial bearing is kept for 2-4 hours; The obtained high-strength wear-resistant bearing composite structure component is: S+C+Fe2N+Fe3N+Fe4N.

5. A method of making a high-strength, wear-resistant bearing according to claim 4, wherein, In step S51, the temperature is 830-850 DEG C, and the initial bearing is kept for 15 hours; in step S52, the temperature is 545-560 DEG C, and the initial bearing is kept for 3 hours.

6. The method of claim 1, wherein the high strength, wear resistant bearing is formed by the steps of: The low-carbon alloy steel comprises the following components with the mass percentage: C 0.17-0.23%, Si 0.15-0.37%, Mn 0.55-0.95%, S≤0.035%, P≤0.035, Cr 0.30-0.70%, Ni 0.45-0.80%, Cu≤0.03%, Mo 0.15-0.30%, Ti 0.04-0.10%, and the rest is Fe and inevitable impurities.

Images