A TC bearing and its production process

Abstract

This application relates to the field of bearing processing, and specifically discloses a TC bearing and its production process. The TC bearing includes a TC bearing and a wear-resistant layer. The wear-resistant layer includes wear-resistant cemented carbide, wear-resistant powder, and a cylindrical mold. The wear-resistant cemented carbide is adhesively bonded to the surface of the TC bearing. The main raw material of the wear-resistant cemented carbide is tungsten carbide. The outer surface of the TC bearing is sleeved with the cylindrical mold. The wear-resistant powder is filled between the wear-resistant cemented carbide and the cylindrical mold. The wear-resistant layer is sintered by plasma surfacing technology. Its preparation method is as follows: find good concentricity; introduce the wear-resistant powder into the barrel; weld; cool, and then perform grinding to remove excess material and grind to the finished size. The TC bearing of this application can be used for mechanical wear-resistant processing, and it has the advantage of good wear resistance. In addition, the preparation method of this application has the advantage of closer connection.

Description

Technical Field

[0001] This application relates to the field of bearing processing, and more specifically, to a TC bearing and its production process. Background Art

[0002] The hard alloy TC radial bearing is produced by a process of sintering in a high-temperature furnace. The matrix, tungsten carbide powder and hard alloy are sintered together and then machined. The hard alloy TC bearing is widely used in the petroleum industry.

[0003] The TC bearing is one of the important components in the positive displacement motor for oil exploration drilling. It mainly bears the radial load generated during the operation of the transmission shaft of the positive displacement motor. Therefore, the quality and performance of the TC bearing are directly related to the service life of the entire drilling tool.

[0004] In the prior art, the conventional preparation method for TC bearing processing is to use high-temperature sintering technology, that is, hard alloy blocks, solder and additives are sintered at high temperature on the inner and outer surfaces of the TC bearing. However, due to the relatively soft hardness of the solder between the hard alloy blocks, which wears out earlier than the hard alloy blocks, there are problems such as uneven wear between the inner and outer sleeves of the TC bearing and easy peeling of the hard blocks, resulting in premature failure and scrapping of the TC bearing. Summary of the Invention

[0005] In order to improve the wear resistance of the TC bearing, this application provides a TC bearing and its production process.

[0006] In the first aspect, this application provides a TC bearing, adopting the following technical solution:

[0007] A TC bearing includes a TC bearing and a wear-resistant layer. The wear-resistant layer includes wear-resistant hard alloy, wear-resistant powder and a cylindrical mold. The wear-resistant hard alloy is bonded to the surface of the TC bearing. The main raw material of the wear-resistant hard alloy is tungsten carbide. The outer surface of the TC bearing is sleeved with the cylindrical mold. The wear-resistant powder is filled between the wear-resistant hard alloy and the cylindrical mold. The wear-resistant layer is sintered by plasma surfacing technology.

[0008] By adopting the above technical solution, due to the high temperature of the plasma arc column and large energy density, the heating of the welded part is concentrated and the penetration ability is strong. Since the plasma arc is cylindrical, with a small diffusion angle and good straightness, the shape and size of the welding molten pool are less affected by the arc length fluctuation, so it is easy to obtain a uniform weld formation. While in TIG welding, as the arc length increases, the fusion width increases and the fusion depth decreases. Due to the compression effect and sufficient thermal ionization of the plasma arc, the arc works stably. Especially when the combined plasma arc is used for welding with a small current (0.1 A), it still has a relatively flat static characteristic and is equipped with a constant current (drooping) power supply, which can ensure that the welding process is very stable. Therefore, ultra-thin components can be welded, making the three-layer structure more tightly combined, making the service life of the TC bearing longer and improving the wear resistance of the TC bearing.

[0009] Wear-resistant cemented carbide has high strength, high hardness and excellent wear resistance. Cemented carbide is usually a densified metal compound formed by powder metallurgy technology with transition metal carbides and relatively soft binder phase metals in Group VIII. WC is usually selected as the hard phase. Compared with other carbides, WC has some unique characteristics. WC has a relatively high elastic modulus, can withstand plastic deformation at room temperature, and its cleavage energy is several times that of the other carbides. There are also some limitations in the selection of cemented carbide and the binder phase. It is necessary to select a suitable binder material and hard phase to form a high density through liquid phase sintering.

[0010] The wear-resistant powder is filled between the wear-resistant cemented carbide cylindrical molds and sintered using the plasma surfacing technology. The formed wear-resistant layer is not easy to crack, thereby improving the wear resistance of the TC bearing.

[0011] Preferably, the wear-resistant cemented carbide comprises the following raw materials: 85 - 118 parts of tungsten carbide, 0.2 - 1.6 parts of iron powder, 0.5 - 0.8 parts of nickel powder, 10 - 15 parts of cobalt powder, and 0.3 - 0.8 parts of rare earth oxide.

[0012] By adopting the above technical solutions, the added rare earth elements are more easily and uniformly dispersed at the boundaries of tungsten carbide and cobalt, and form a film after adsorption at the boundaries. The dissolution and precipitation rate of tungsten carbide grains is also restricted due to the hindered migration of W and C in the liquid-phase cobalt. At this time, the WC grains are difficult to grow continuously during the sintering process. Since rare earth elements have high activity, when an appropriate amount of rare earth is added, it can react with solid-phase impurity elements to form stable compounds distributed at the WC and Co interfaces, and can also react with gaseous impurity elements such as S and O to reduce the formation of pores. Eventually, the interface between WC and Co is purified, and the bonding strength between WC and Co is enhanced. Due to the grain refinement and pinning effect on the WC / Co grain boundaries after adding rare earth elements, the dislocation and interface migration ability of WC grains are reduced, and at the same time, the fault energy is enhanced, all of which will inhibit the transformation during the sintering and cooling stages. Adding a small amount of rare earth elements to the alloy can effectively improve the mechanical properties of the cemented carbide, and thus improve the wear resistance of the wear-resistant cemented carbide.

[0013] Preferably, the rare earth oxide includes one or more of yttrium trioxide, cerium trioxide and neodymium oxide.

[0014] By adopting the above technical solutions, when a small amount of rare earth elements are added, there are still some coarse WC grains in the wear-resistant cemented carbide, but no pores are found, indicating that adding a small amount of rare earth can also improve the fluidity of Co between WC, reduce the formation of pores, and thus improve the wear resistance.

[0015] Preferably, the preparation of the wear-resistant cemented carbide includes the following steps:

[0016] (1) Mix tungsten carbide, iron powder, nickel powder, cobalt powder and rare earth oxide powder, and mix them evenly to obtain a mixture;

[0017] (2) The obtained mixture undergoes procedures of wet grinding, drying and granulation to obtain a matrix;

[0018] (3) Press the obtained matrix into shape;

[0019] (4) Finally, sinter the shaped matrix at low pressure to obtain the wear-resistant cemented carbide.

[0020] By adopting the above technical solutions, after adding rare earth elements, the powder state before alloy sintering is improved. After adding rare earth elements, the brittleness of the mixed powder is increased, and the three added rare earth elements are more easily and uniformly dispersed at the WC and Co boundaries, and form a film after adsorption at the boundaries. The dissolution and precipitation rate of WC grains is also restricted due to the hindered migration of W and C in the liquid-phase Co. At this time, the WC grains are difficult to grow continuously during the sintering process. This is the main factor for rare earth to inhibit the growth of WC grains. At the same time, adding rare earth elements can slightly increase the W content in the binder phase, playing a certain solid solution strengthening effect.

[0021] Preferably, the wear-resistant powder includes nickel-based alloy powder and tungsten carbide powder, and the mass ratio of the nickel-based alloy powder to the tungsten carbide is 1:(2.0 - 3.5).

[0022] By adopting the above technical solution, adding nickel-based alloy powder to tungsten carbide powder can reduce the sintering temperature of the wear-resistant powder, improve its density, inhibit the growth of WC grains in the alloy through the dissolution-precipitation mechanism, significantly improve the performance of the wear-resistant powder, and further improve the mechanical properties of the wear-resistant layer.

[0023] Preferably, the material of the cylindrical mold is high boron iron-based wear-resistant alloy.

[0024] By adopting the above technical solution, as the "fourth generation" metal wear-resistant material after high manganese steel, wear-resistant alloy steel, and high chromium cast iron, high boron iron-based wear-resistant alloy is used for the cylindrical mold during the welding of wear-resistant powder, which improves the stability of the wear-resistant layer, makes the wear-resistant layer more firmly combined with the TC bearing, and further improves the wear resistance of the TC bearing.

[0025] Preferably, the wear-resistant powder needs to be welded with oscillation during welding, and the oscillation speed is set to 10 - 15 mm / s.

[0026] By adopting the above technical solution, oscillatory welding is a welding operation in which the heat source of the weld oscillates horizontally regularly on the welded part. Through a specific oscillation speed, the welding becomes closer.

[0027] In the second aspect, the present application provides a production process for a TC bearing, adopting the following technical solution:

[0028] A production process for a TC bearing includes the following steps:

[0029] S1: Clamp the TC bearing on the chuck and align the concentricity through the outer circle so that the axis of the TC bearing coincides with the axis of the equipment chuck, and bond wear-resistant cemented carbide on the surface of the TC bearing;

[0030] S2: Sleeve a cylindrical mold on the outer surface of the TC bearing, a gap is generated between the cylindrical mold and the TC bearing, and the wear-resistant powder is filled in the gap;

[0031] S3: Start programming so that the welding torch welds the wear-resistant powder and the cylindrical mold according to the welding trajectory;

[0032] S4: Set the inlet gas pressure of three channels, the ion gas is 0.35 Mpa, the powder feeding gas is 0.22 Mpa, the central gas is 0.2 Mpa, set the current and voltage in the program, the current is 65 A, and the voltage is 50 V;

[0033] S5: Load the welding needle into the welding torch and move it to the welding starting point to adjust the distance from the wear-resistant powder, and then start welding.

[0034] S6: After welding, perform cooling, and then perform grinding to remove excess material and grind it to the finished size.

[0035] By adopting the above technical solution, after adding rare earth elements, it is beneficial to reduce the WC grain size and increase the hardness of the binder phase. After the WC grain size is reduced and the hardness of the binder phase is increased, the number of asperity hard particle contacts increases during the wear process, reducing the probability of adhesive wear occurring, thereby obtaining a smaller friction coefficient and stronger wear resistance. By reacting rare earth elements with impurity elements to form stable compounds, the WC / Co interface is improved, and the bonding strength between WC and Co is increased, thereby reducing adhesive friction wear. When the wear-resistant cemented carbide is sintered and cooled, Co has a higher shrinkage rate than WC. Therefore, during the sintering and cooling stage of the alloy, WC and Co are in a compressive stress state and a tensile stress state respectively, which is beneficial to reducing the brittle fracture of WC and improving the wear resistance of the TC bearing.

[0036] In summary, the present application has the following beneficial effects:

[0037] 1. Since the plasma arc used in the present application has a high arc column temperature and a large energy density, the heating of the welded part is concentrated and the penetration ability is strong. Since the plasma arc is cylindrical, with a small diffusion angle and good straightness, the shape and size of the welding molten pool are less affected by the arc length fluctuation, so it is easy to obtain a uniform weld formation. For TIG welding, as the arc length increases, its weld width increases while the weld depth decreases. Due to the compression effect and sufficient thermal ionization of the plasma arc, the arc works stably. Especially when the combined plasma arc is used for welding with a small current (0.1 A), it still has a relatively flat static characteristic and is equipped with a constant current (drooping) power supply, which can ensure that the welding process is very stable. Therefore, ultra-thin components can be welded, making the three-layer structure more tightly combined, making the service life of the TC bearing longer, and improving the wear resistance of the TC bearing.

[0038] 2. In the present application, it is preferably used that the wear-resistant cemented carbide has high strength, high hardness and excellent wear resistance. There are also some restrictions on the selection of the wear-resistant cemented carbide and the binder phase. It is necessary to select a suitable binder material and hard phase to form a high density through liquid phase sintering, improving the wear resistance of the wear-resistant cemented carbide.

[0039] 3. In the method of this application, after adding rare earth elements, it is beneficial to reduce the WC grain size and increase the hardness of the binder phase. After the WC grain size is reduced and the hardness of the binder phase is increased, the number of micro-convex hard particles in contact during the wear process increases, reducing the probability of adhesive wear occurring, thereby obtaining a smaller friction coefficient and stronger wear resistance. By reacting rare earth elements with impurity elements to form stable compounds, the WC / Co interface is improved, and the bonding strength between WC and Co is increased, thereby reducing adhesive friction wear. When the wear-resistant cemented carbide is sintered and cooled, Co has a higher shrinkage rate than WC. Therefore, during the sintering and cooling stage of the alloy, WC and Co are in a compressive stress state and a tensile stress state respectively, which is beneficial to reducing the brittle fracture of WC and improving the wear resistance of the TC bearing. Specific Embodiments

[0040] The following further elaborates on this application in conjunction with embodiments. It should be specifically noted that: for those not specifying specific conditions in the following embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following embodiments can all be sourced from ordinary commercial sales.

[0041] The nickel-based alloy powder is a nickel-chromium heat-resistant alloy; the high-boron iron-based wear-resistant alloy is an iron-nickel-chromium-silicon-boron iron-based powder.

[0042] Preparation Examples of Raw Materials and / or Intermediates

[0043] Preparation Example 1

[0044] A wear-resistant cemented carbide includes the following raw materials: 85 kg of tungsten carbide, 0.2 kg of iron powder, 0.5 kg of nickel powder, 10 kg of cobalt powder, and 0.3 kg of rare earth oxide.

[0045] The preparation of a wear-resistant cemented carbide includes the following steps:

[0046] (1) Mix tungsten carbide, iron powder, nickel powder, cobalt powder, and rare earth oxide powder, and mix them evenly to obtain a mixture;

[0047] (2) The obtained mixture undergoes procedures of wet grinding, drying, and granulation to obtain a matrix;

[0048] (3) Press the obtained matrix into shape;

[0049] (4) Finally, sinter the shaped matrix at low pressure to obtain the wear-resistant cemented carbide.

[0050] Preparation Example 2

[0051] A wear-resistant cemented carbide includes the following raw materials: 98 kg of tungsten carbide, 0.8 kg of iron powder, 0.6 kg of nickel powder, 12 kg of cobalt powder, and 0.5 kg of rare earth oxide.

[0052] The preparation of a wear-resistant cemented carbide includes the following steps:

[0053] (1) Mix tungsten carbide powder, iron powder, nickel powder, cobalt powder and rare earth oxide powder evenly to obtain a mixture;

[0054] (2) Subject the obtained mixture to wet grinding, drying and granulation procedures to obtain a matrix;

[0055] (3) Mold the obtained matrix;

[0056] (4) Finally, sinter the molded matrix under low pressure to obtain the wear-resistant cemented carbide.

[0057] Preparation Example 3

[0058] A wear-resistant cemented carbide includes the following raw materials: 118 kg of tungsten carbide, 1.6 kg of iron powder, 0.8 kg of nickel powder, 15 kg of cobalt powder, and 0.8 kg of rare earth oxide.

[0059] The preparation of a wear-resistant cemented carbide includes the following steps:

[0060] (1) Mix tungsten carbide powder, iron powder, nickel powder, cobalt powder and rare earth oxide powder evenly to obtain a mixture;

[0061] (2) Subject the obtained mixture to wet grinding, drying and granulation procedures to obtain a matrix;

[0062] (3) Mold the obtained matrix;

[0063] (4) Finally, sinter the molded matrix under low pressure to obtain the wear-resistant cemented carbide.

[0064] Example

[0065] Example 1

[0066] A TC bearing includes a TC bearing and a wear-resistant layer. The wear-resistant layer includes a wear-resistant cemented carbide, wear-resistant powder and a cylindrical mold. The wear-resistant cemented carbide is bonded to the surface of the TC bearing, the cylindrical mold is sleeved on the outer surface of the TC bearing, and the wear-resistant powder is filled between the wear-resistant cemented carbide and the cylindrical mold. The wear-resistant layer is sintered by plasma surfacing technology. The wear-resistant cemented carbide is obtained from Preparation Example 2. The wear-resistant powder includes nickel-based alloy powder and tungsten carbide powder, and the mass ratio of the nickel-based alloy powder to tungsten carbide is 1:2.0.

[0067] A production process of a TC bearing includes the following steps:

[0068] S1: Clamp the TC bearing on the chuck and align the concentricity through the outer circle so that the axis of the TC bearing coincides with the axis of the equipment chuck, and bond the wear-resistant cemented carbide to the surface of the TC bearing;

[0069] S2: A cylindrical mold is sleeved on the outer surface of the TC bearing, creating a gap between the cylindrical mold and the TC bearing, and wear-resistant powder is filled in the gap;

[0070] S3: Start programming to make the welding torch weld the wear-resistant powder and the cylindrical mold according to the welding trajectory;

[0071] S4: Set the inlet gas pressure for three paths. The ion gas is 0.35 - 0.45 Mpa, the powder feeding gas is 0.20 - 0.22 Mpa, and the central gas is 0.15 - 0.2 Mpa. Set the current and voltage in the program. The current is 60 - 65 A and the voltage is 50 - 60 V;

[0072] S5: Install the welding needle into the welding torch and move it to the welding starting point to adjust the distance from the wear-resistant powder, and then start welding;

[0073] S6: After welding, carry out cooling, and then carry out grinding to remove the excess material and grind it to the finished product size.

[0074] Example 2

[0075] A TC bearing includes a TC bearing and a wear-resistant layer. The wear-resistant layer includes wear-resistant hard alloy, wear-resistant powder, and a cylindrical mold. The wear-resistant hard alloy is bonded to the surface of the TC bearing. A cylindrical mold is sleeved on the outer surface of the TC bearing, and the wear-resistant powder is filled between the wear-resistant hard alloy and the cylindrical mold. The wear-resistant layer is sintered by plasma surfacing technology. The wear-resistant hard alloy is obtained from Preparation Example 2. The wear-resistant powder includes nickel-based alloy powder and tungsten carbide powder, and the mass ratio of the nickel-based alloy powder to the tungsten carbide is 1:2.5.

[0076] A production process of a TC bearing includes the following steps:

[0077] S1: Clamp the TC bearing on the chuck and align the concentricity through the outer circle to make the axis of the TC bearing coincide with the axis of the equipment chuck, and bond the wear-resistant hard alloy to the surface of the TC bearing;

[0078] S2: A cylindrical mold is sleeved on the outer surface of the TC bearing, creating a gap between the cylindrical mold and the TC bearing, and wear-resistant powder is filled in the gap;

[0079] S3: Start programming to make the welding torch weld the wear-resistant powder and the cylindrical mold according to the welding trajectory;

[0080] S4: Set the inlet gas pressure for three paths. The ion gas is 0.35 - 0.45 Mpa, the powder feeding gas is 0.20 - 0.22 Mpa, and the central gas is 0.15 - 0.2 Mpa. Set the current and voltage in the program. The current is 60 - 65 A and the voltage is 50 - 60 V;

[0081] S5: Install the welding needle into the welding torch and move it to the welding starting point to adjust the distance from the wear-resistant powder, and then start welding;

[0082] S6: After welding is completed, perform cooling, and then perform grinding to remove excess material and grind to the finished size.

[0083] Example 3

[0084] A TC bearing includes a TC bearing and a wear-resistant layer. The wear-resistant layer includes wear-resistant cemented carbide, wear-resistant powder, and a cylindrical mold. The wear-resistant cemented carbide is adhesively bonded to the surface of the TC bearing. The outer surface of the TC bearing is sleeved with a cylindrical mold. The wear-resistant powder is filled between the wear-resistant cemented carbide and the cylindrical mold. The wear-resistant layer is sintered by plasma surfacing technology. The wear-resistant cemented carbide is obtained from Preparation Example 2. The wear-resistant powder includes nickel-based alloy powder and tungsten carbide powder, and the mass ratio of the nickel-based alloy powder to tungsten carbide is 1:3.5.

[0085] A production process of a TC bearing includes the following steps:

[0086] S1: Clamp the TC bearing on the chuck and align the concentricity through the outer circle so that the axis of the TC bearing coincides with the axis of the equipment chuck, and adhesively bond the wear-resistant cemented carbide to the surface of the TC bearing;

[0087] S2: Sleeve the outer surface of the TC bearing with a cylindrical mold, creating a gap between the cylindrical mold and the TC bearing, and fill the wear-resistant powder in the gap;

[0088] S3: Start programming to make the welding torch weld the wear-resistant powder and the cylindrical mold according to the welding trajectory;

[0089] S4: Set the three-way intake air pressure. The ion gas is 0.35 - 0.45 Mpa, the powder feeding gas is 0.20 - 0.22 Mpa, and the central gas is 0.15 - 0.2 Mpa. Set the current and voltage in the program. The current is 60 - 65 A, and the voltage is 50 - 60 V;

[0090] S5: Install the welding needle into the welding torch and move it to the welding starting point to adjust the distance from the wear-resistant powder, and start welding;

[0091] S6: After welding is completed, perform cooling, and then perform grinding to remove excess material and grind to the finished size.

[0092] Comparative Example

[0093] Comparative Example 1

[0094] A TC bearing, different from Example 2 in that the wear-resistant layer does not add wear-resistant cemented carbide.

[0095] Comparative Example 2

[0096] A TC bearing, different from Example 2 in that the wear-resistant cemented carbide in the wear-resistant layer is replaced with steel alloy.

[0097] Comparative Example 3

[0098] A TC bearing, which is different from that of Example 2 in that wear-resistant powder is not added to the wear-resistant layer.

[0099] Comparative Example 4

[0100] A TC bearing, which is different from that of Example 2 in that the wear-resistant powder in the wear-resistant layer is replaced with tungsten carbide powder.

[0101] Comparative Example 5

[0102] A TC bearing, which is different from that of Example 2 in that a cylindrical mold is not added to the wear-resistant layer.

[0103] Comparative Example 6

[0104] A TC bearing, which is different from that of Example 2 in that the material of the cylindrical mold in the wear-resistant layer, high boron iron-based wear-resistant alloy, is replaced with high manganese steel.

[0105] Comparative Example 7

[0106] A TC bearing, which is different from that of Example 2 in that the wear-resistant powder in the wear-resistant layer is sintered with wear-resistant cemented carbide by electrolysis.

[0107] Comparative Example 8

[0108] A TC bearing, which is different from that of Example 2 in that a wear-resistant layer is not added to the TC bearing.

[0109] Performance Detection Test

[0110] Detection Method Hardness Detection: Take the TC bearings prepared in Examples 1-3 and Comparative Examples 1-8, and detect the hardness of the wear-resistant NdFeB magnet according to GB / T799-2014 "Test Method for Vickers Hardness of Cemented Carbides". The detection results are shown in Table 1.

[0111] Detection Method / Test Method

[0112] Table 1

[0113]

[0114]

[0115] Combined with Examples 1-3 and Comparative Examples 1-8 and Table 1, it can be seen that Example 2 has a stronger hardness and a lower friction coefficient. Furthermore, the wear resistance of the TC bearing prepared in Example 2 is better, indicating that wear-resistant cemented carbide has high strength, high hardness and excellent wear resistance. Cemented carbide is usually a densified metal compound formed by processing transition metal carbides and relatively soft binder phase metals in Group VIII through powder metallurgy technology. Wear-resistant powder is filled between the wear-resistant cemented carbide cylindrical molds and sintered using plasma surfacing technology. The formed wear-resistant layer is not easily cracked, thereby improving the wear resistance of the TC bearing.

[0116] Combined with Comparative Example 1 and Comparative Example 2 and Table 1, it can be seen that the wear-resistant performance of wear-resistant cemented carbide in the TC bearing is relatively large, thereby making the TC bearing more wear-resistant. Wrapping the wear-resistant cemented carbide on the TC bearing better protects the TC bearing.

[0117] Combined with Comparative Example 3 and Comparative Example 4 and Table 1, it can be seen that adding wear-resistant powder to the wear-resistant layer makes the wear-resistant performance better, makes the three-layer structure combine more tightly, and improves the stability of the TC bearing.

[0118] Combined with Comparative Example 5 and Comparative Example 6 and Table 1, it can be seen that when the cylindrical mold in the wear-resistant layer is made of high-boron iron-based wear-resistant alloy material, the TC bearing is more stable.

[0119] Combined with Comparative Example 7 and Comparative Example 8 and Table 1, it can be seen that the plasma arc has a high column temperature and a high energy density, so the heating of the welded part is concentrated and the penetration ability is strong. Since the plasma arc is cylindrical, has a small diffusion angle and good straightness, the shape and size of the welding molten pool are less affected by the arc length fluctuation. Therefore, it is easy to obtain a uniform weld formation, making the combination more tight and improving the wear resistance.

[0120] This specific embodiment is only an explanation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A TC bearing, characterized in that, It includes a TC bearing and a wear-resistant layer. The wear-resistant layer includes wear-resistant cemented carbide, wear-resistant powder, and a cylindrical mold. The wear-resistant cemented carbide is bonded to the surface of the TC bearing. The main raw material of the wear-resistant cemented carbide is tungsten carbide. The cylindrical mold is sleeved on the outer surface of the TC bearing. The wear-resistant powder is filled between the wear-resistant cemented carbide and the cylindrical mold. The wear-resistant layer is made by plasma surfacing technology. The wear-resistant cemented carbide includes the following raw materials: 85 - 118 parts of tungsten carbide, 0.2 - 1.6 parts of iron powder, 0.5 - 0.8 parts of nickel powder, 10 - 15 parts of cobalt powder, 0.3 - 0.8 parts of rare earth oxide. The wear-resistant powder includes nickel-based alloy powder and tungsten carbide powder. The mass ratio of the nickel-based alloy powder to the tungsten carbide is 1:(2.0 - 3.5). The material of the cylindrical mold is high boron iron-based wear-resistant alloy.

2. The TC bearing according to claim 1, wherein: The rare earth oxide includes one or several of yttrium oxide, cerium oxide, and neodymium oxide.

3. The TC bearing according to claim 2, characterized in that: The preparation of the wear-resistant cemented carbide includes the following steps: (1) Mix tungsten carbide, iron powder, nickel powder, cobalt powder, and rare earth oxide powder evenly to obtain a mixture. (2) The obtained mixture goes through the procedures of wet grinding, drying, and granulation to obtain a matrix. (3) Press the obtained matrix into a shape. (4) Finally, sinter the formed matrix at low pressure to obtain the wear-resistant cemented carbide.

4. A TC bearing according to claim 3, characterized in that: When welding the wear-resistant powder, oscillating welding needs to be carried out, and the oscillation speed is set at 10 - 15 mm / s.

5. A production process of the TC bearing as described in claim 4, including the following steps: S1: Clamp the TC bearing on the chuck and align the concentricity through the outer circle so that the axis of the TC bearing coincides with the axis of the equipment chuck, and bond the wear-resistant cemented carbide to the surface of the TC bearing. S2: Sleeve the cylindrical mold on the outer surface of the TC bearing, creating a gap between the cylindrical mold and the TC bearing, and fill the wear-resistant powder in the gap. S3: Start programming to make the welding torch weld the wear-resistant powder and the cylindrical mold according to the welding track. S4: Set the three-way intake pressure. The ion gas is 0.35 - 0.45 Mpa, the powder feeding gas is 0.20 - 0.22 Mpa, and the central gas is 0.15 - 0.2 Mpa. Set the current and voltage in the program. The current is 60 - 65 A, and the voltage is 50 - 60 V. S5: Install the welding needle into the welding torch and move it to the welding starting point to adjust the distance from the wear-resistant powder, and then start welding. S6: After welding, carry out cooling, and then carry out grinding to remove the excess material and grind it to the finished size.

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