A method for manufacturing a self-lubricating bearing comprising a channeled web and a self-lubricating bearing

Abstract

A preparation method of a self-lubricating bearing containing a plain net and the self-lubricating bearing, the preparation method comprising the following steps: providing a metal net, the metal net being a plain net; providing a polymer material; providing a base plate; heating the base plate and laying the composite plate on the base plate to bond the polymer material layer to the base plate; performing cutting processing on the polymer material layer on the other side of the base plate to make part of the warp exposed to the polymer material layer, and the exposed part of the warp accounts for 10-40% of the total area to form a bearing blank; and rolling the bearing blank to make a self-lubricating bearing, the weft being parallel to the axial direction of the self-lubricating bearing, and the warp being perpendicular to the axial direction of the self-lubricating bearing. The self-lubricating bearing prepared by the preparation method can guarantee the radial strength of the polymer material layer and meet the requirement on the friction performance, and realizes the characteristics of thin thickness and high strength.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sliding bearing, in particular to a preparation method of self-lubricating bearing containing seat type net and self-lubricating bearing. BACKGROUND

[0002] In production, due to the limitation of assembly space, weight requirement and other factors, ultra-thin bearings are often used. The biggest feature of ultra-thin bearing is that the ratio of bearing outer diameter to bearing width is much larger than that of general bearings. The ratio of bearing outer diameter to bearing width of some bearings can even reach more than 30, that is, "thin". It has a wide application in many fields such as speed reducer, automobile seat and hinge, etc. Therefore, it also has a sealing structure for protecting the bearing from external fluid and impurities entering the bearing to cause or aggravate structural damage. However, thin bearings can meet many special requirements in terms of size and space occupation, but they also have problems such as insufficient strength, and the sealing structure on the bearing is also prone to damage.

[0003] The existing self-lubricating bearing is generally made of three layers of composite bearings. The surface is melted into a layer of high polymer material layer, the middle layer is a layer of tin bronze alloy layer, and the bottom layer is a substrate. In order to ensure the strength, the thickness of the bearing is very thick, at least more than 5mm to ensure that the layers do not peel off, so as to ensure the strength of the bearing in the axial and radial directions, so as to prevent damage during use. Such thickness is unacceptable for some special occasions because it occupies too much space. SUMMARY

[0004] Therefore, the present application provides a preparation method of self-lubricating bearing containing seat type net and self-lubricating bearing. The self-lubricating bearing prepared by the method can not only meet the low friction coefficient, but also ensure the axial strength and radial strength, that is, the bearing capacity is very strong, and the thickness problem can also be solved, thereby meeting the actual needs.

[0005] A preparation method of self-lubricating bearing containing seat type net, comprising the following steps:

[0006] STEP 101: providing a metal net, the metal net being a seat type net, comprising a plurality of parallel weft filaments and a plurality of warp filaments wound on the plurality of weft filaments, the diameter of the weft filament being greater than the diameter of the warp filament so that the warp filament is not deformed when wound on the weft filament, the warp filament being made of tin bronze alloy, the porosity of the metal net being controlled between 60% and 90%, and the weft filament and the warp filament being sintered together;

[0007] STEP 102: providing a polymer material, which is injection molded on the metal mesh and makes the metal mesh submerged in the polymer material to form a composite board;

[0008] STEP 103: providing a substrate;

[0009] STEP 104: heating the substrate and laying the composite board on the substrate to make the polymer material layer adhere to the substrate;

[0010] STEP 105: cutting the polymer material layer on the other side of the substrate to make part of the warp exposed to the polymer material layer, and the exposed part of the warp accounts for 10-40% of the total area to form a bearing blank;

[0011] STEP 106: rolling the bearing blank to make a self-lubricating bearing, the weft is parallel to the axial direction of the self-lubricating bearing, and the warp is perpendicular to the axial direction of the self-lubricating bearing.

[0012] Further, the weft is made of one of carbon steel, manganese steel, and titanium steel.

[0013] Further, the tin bronze alloy is one of CuSn10, CuSn13, and CuSn8Zn3.

[0014] Further, the mesh type net is one of plain weave, twill weave, and double wire Dutch weave.

[0015] Further, the polymer material includes one or more of polyaryletherketone, modified polyether ether ketone, polyamide-imide, modified polyphenylene sulfide, polyvinylidene fluoride, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, polycaprolactam, and ultra-high molecular weight polyethylene.

[0016] Further, the thickness of the metal mesh is 0.4-2 mm.

[0017] Further, the thickness of the substrate is less than 1 mm.

[0018] Further, in STEP 105, the exposed tin bronze alloy layer accounts for 10-40% of the total area and is complementary to the porosity of the metal mesh.

[0019] Further, the temperature of the substrate heating should be able to melt the corresponding polymer material.

[0020] Further, in STEP 104, after the composite board is adhered to the substrate by heating, the substrate and the composite board are also rolled.

[0021] Compared with the prior art, the preparation method of the self-lubricating bearing comprising the seat-type metal net provided by the application uses the metal net, further uses the seat-type metal net, improves and ensures the strength of the bearing while meeting the self-lubricating performance, and the thickness of the self-lubricating bearing can be minimized due to the presence of the metal net, thereby meeting the requirement of the wall thickness. Specifically, the weft of the seat-type metal net is parallel to the axial direction of the bearing, which can ensure the axial strength of the lubricating material layer, the warp is perpendicular to the axial direction of the bearing and is made of tin bronze alloy, and 10% to 40% of the tin bronze alloy is exposed to the high polymer material layer, thereby ensuring the radial strength of the high polymer material layer and meeting the requirement of the friction performance, and the total thickness of the substrate and the high polymer material can be designed to be very thin under the requirement of the strength, thereby realizing the characteristics of thin thickness and high strength. Meanwhile, in the above steps, the metal net forms a metal framework, and the high polymer material is uniformly distributed between the framework, thereby improving the strength of the bearing material and ensuring the wear resistance of the bearing. DETAILED DESCRIPTION

[0022] The specific embodiments of the application are further described below. It should be understood that the description of the embodiments of the application herein is not intended to limit the protection scope of the application.

[0023] The application provides a preparation method of a self-lubricating bearing comprising a seat-type metal net, which comprises the following steps:

[0024] STEP 101: providing a metal net, wherein the metal net is a seat-type metal net comprising a plurality of parallel wefts and a plurality of warps arranged on the wefts, the diameter of the weft is greater than the diameter of the warp so that the warp is not deformed when arranged on the weft, the warp is made of tin bronze alloy, the porosity of the metal net is controlled to be between 60% and 90%, and the weft and the warp are sintered together;

[0025] STEP 102: providing a high polymer material, wherein the high polymer material is injection molded on the metal net and submerged in the high polymer material to form a composite plate;

[0026] STEP 103: providing a substrate;

[0027] STEP 104: heating the substrate and laying the composite plate on the substrate to bond the high polymer material layer to the substrate;

[0028] STEP 105: cutting the high polymer material layer on the other side of the substrate to expose part of the warp to the high polymer material layer, and the exposed part of the warp accounts for 10% to 20% of the total area to form a bearing blank.

[0029] STEP 106: rolling the bearing blank to make a self-lubricating bearing, the weft threads being parallel to the axial direction of the self-lubricating bearing, and the warp threads being perpendicular to the axial direction of the self-lubricating bearing.

[0030] In step STEP 101, the metal mesh is a seat-type mesh, which is a prior art and includes a plurality of weft threads arranged parallel to each other, and a plurality of warp threads arranged on the plurality of weft threads. The seat-type mesh has various types, such as plain type, twill type, double-thread Dutch type, etc. In the present embodiment, the metal mesh is a plain-type seat-type mesh, each of the warp threads passes through the plurality of weft threads in an up-and-down manner, and adjacent two warp threads pass through the weft threads in an up-and-down manner in an interlaced manner. For the twill type and the double-thread Dutch type, their structures and arrangement manners are also prior arts, which will not be described one by one here. The diameter of the weft thread in the metal mesh is greater than the diameter of the warp thread, and the diameter of the weft thread should be greater than the diameter of the warp thread to the extent that the weft thread will not be deformed when the warp thread is arranged, so as to prevent the weft thread from being cut during subsequent machining, and also to maintain the strength of the weft thread. The warp thread should have self-lubricating performance to provide self-lubricating ability and also have a certain strength, so it is made of tin bronze alloy material, which can be one of CuSn10, CuSn13, and CuSn8Zn3. The weft thread is used to provide sufficient strength for the self-lubricating bearing, so the weft thread can be made of high-strength materials such as carbon steel, manganese steel, titanium steel, etc. Of course, it can be understood that for some bearings that need to be flanged, materials suitable for bending should be used, and materials such as manganese steel that are not easy to bend should not be used because they are easy to break.

[0031] The porosity of the metal mesh is controlled between 60% and 90%. If it is less than 60%, the porosity will be too small, and when the polymer material layer is injection molded, the percentage of the polymer material filled into the metal mesh will be too small, which reduces the bonding force between the polymer material layer and the pores of the metal mesh, and also reduces the self-lubricating ability of the self-lubricating bearing, which is not conducive to ensuring the lubricating performance of the self-lubricating bearing. If the porosity is too large, the strength provided by the metal mesh for the self-lubricating bearing will be too small, so that the polymer material layer will be crushed during use of the bearing.

[0032] In addition, the thickness of the metal mesh can be set according to actual needs, but for thin and high-strength, the thickness should be between 0.4 and 2 mm. In the present application, according to different specifications, the thickness of the metal mesh can be one of 0.48 mm, 0.78 mm, and 0.98 mm.

[0033] Meanwhile, the metal mesh should be sintered when it is used, so that the weft and warp are sintered together. Because the plate-shaped bearing blank is made, and is rolled according to the size of the self-lubricating bearing, in order to prevent the weft and warp of the metal mesh from being dislocated, and the metal mesh and the polymer material are separated, the weft and warp should be sintered together, and the sintering temperature is generally between 850-950℃, that is, as long as the copper alloy warp is sintered on the weft made of steel.

[0034] In STEP 102, the polymer material includes one or more of polyaryletherketone (PAEK), modified polyether ether ketone (PEEK), polyamide-imide (PAI), modified polyphenylene sulfide (PPS), polyvinylidene fluoride (PVDF), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), polycaprolactam (PA6), and ultra-high molecular weight polyethylene (UHMWPE). The above-mentioned materials are suitable for injection molding, and also have certain self-lubricating properties. The injection molding method and equipment are prior art, and will not be described here. In addition, in order to improve the functionality of the polymer material, such as injection moldability, wear resistance, and friction reduction, some other materials such as release agent, molybdenum disulfide, carbon fiber, and graphite are added. The polymer material is injected into the metal mesh, and the metal mesh is submerged or sandwiched in the polymer material, thereby forming the composite plate. In addition, it should be noted that after the composite plate is formed, the polymer material layer is 30-500um higher than the metal mesh. Of course, it cannot be too thick, because it is difficult to make the polymer material layer.

[0035] In STEP 103, the substrate can be a plate made of one of copper, steel, alloy, etc., which is prior art and will not be described here. The thickness can be less than 1mm.

[0036] In STEP 104, the substrate is heated by heating furnace, microwave heating, etc., which is prior art. The heating temperature of the substrate should be suitable for melting the polymer material, so that the composite plate is fixedly bonded to the substrate. Of course, it can be considered that in order to strengthen the bonding strength between the composite plate and the substrate, the substrate can also be rolled.

[0037] In STEP 105, the metal wire is exposed by turning to form the bearing blank. Specifically, the exposed area of the wire accounts for 10-40% of the total area, which is complementary to the porosity of the metal wire, i.e. if the porosity of the metal wire is X, the exposed area of the wire after the turning is 100-X.

[0038] In STEP 106, the bearing blank is then formed into a bearing by coiling and welding, and then the bearing is interference fitted on the pin shaft, and finally, the bearing is finished to form a sliding bearing. During the coiling of the bearing, the weft wire is parallel to the axial direction of the self-lubricating bearing, and the warp wire is perpendicular to the axial direction of the self-lubricating bearing. Because the rotation direction of the bearing during use is usually perpendicular to the axial direction of the bearing, the warp wire is perpendicular to the axial direction of the bearing to better conform to the direction of the friction force. During the installation of the bearing in the seat angle adjuster, the pressure from other assemblies such as the nut is mostly parallel to the axial direction of the bearing, so the weft wire is parallel to the axial direction of the bearing to improve the axial load capacity.

[0039] The self-lubricating bearing prepared by the above preparation method comprises a substrate and a self-lubricating layer fixedly arranged on the substrate. The self-lubricating layer comprises a metal wire and a high polymer material layer encapsulated in the metal wire. The metal wire is a mesh wire comprising a plurality of parallel weft wires and a plurality of warp wires wound on the weft wires. The diameter of the weft wire is greater than the diameter of the warp wire so that the warp wire is not deformed when wound on the weft wire. The extension direction of the weft wire is parallel to the axial direction of the self-lubricating bearing, and the extension direction of the warp wire is perpendicular to the axial direction of the self-lubricating bearing. The warp wire is made of tin bronze alloy. The porosity of the metal wire is controlled to be between 60% and 90%. The radial free surface of the self-lubricating layer is exposed by turning to expose the warp wire, and the exposed part of the warp wire accounts for 10-40% of the total area. Example 1

[0040] STEP 101: A metal wire is provided, the porosity of the metal wire is controlled to be about 70%, and the thickness of the metal wire is 0.48 mm;

[0041] STEP 102: A high polymer material is provided, the high polymer material is modified polyether ether ketone, and the high polymer material is injection molded on the metal wire and submerged in the high polymer material to form a composite plate, and the total thickness of the high polymer material layer is about 0.8-1.0 mm;

[0042] STEP 103: providing a substrate, the substrate being a carbon steel plate with a thickness of 0.5 mm;

[0043] STEP 104: using a resistance heating furnace to heat the substrate to 380°C, and laying the composite plate on the substrate to bond the polymer material layer on the substrate to form a semi-finished plate;

[0044] STEP 105: machining the semi-finished plate by turning, with a turning of about 0.3 mm, at which time the tin bronze alloy is evenly distributed in the polymer material and the copper exposure rate is about 15% to form a bearing blank;

[0045] STEP 106: rolling the composite finished plate to form a bushing, and hot fitting the bushing on the pin shaft surface to form a sliding bearing. Example 2

[0046] STEP 101: providing a metal mesh with a porosity controlled at about 80%, and a thickness of 0.98 mm;

[0047] STEP 102: providing a polymer material, the polymer material being modified polyphenylene sulfide, and injection molding on the metal mesh and submerging the metal mesh in the polymer material to form a composite plate, the total thickness of the polymer material layer being about 1.8 mm to 2.0 mm;

[0048] STEP 103: providing a substrate, the substrate being a carbon steel plate with a thickness of 0.5 mm;

[0049] STEP 104: using a resistance heating furnace to heat the substrate to 290°C, and laying the composite plate on the substrate to bond the polymer material layer on the substrate to form a semi-finished plate;

[0050] STEP 105: machining the semi-finished plate by turning, with a turning of about 0.4 mm, at which time the tin bronze alloy is evenly distributed in the polymer material and the copper exposure rate is about 30% to form a bearing blank;

[0051] STEP 106: rolling the composite finished plate to form a bushing, and hot fitting the bushing on the pin shaft surface to form a sliding bearing.

[0052] Comparative Example 1

[0053] In the comparative example, the sliding bearing is prepared by the method disclosed in CN202010699463.7; the metal substrate is a carbon steel plate with a thickness of 0.5 mm; the metal mesh is a single-layer braided copper mesh with a thickness of 0.48 mm; and the thickness of the polymer slurry on the copper mesh is about 0.7 mm.

[0054] Comparative Example 2

[0055] In the comparative example, the high polymer material is sintered directly on the carbon steel substrate to form a sliding bearing.

[0056] Detection and testing

[0057] The first detection item is the compression strength test, that is, the load size is tested when the compression deformation is 0.1%. The higher the load, the better the bearing performance and the higher the fatigue strength. The test shows that the unit load of Example 1 is 110 MPa, the unit load of Example 2 is 125 MPa, the unit load of Comparative Example 1 is 83 MPa, and the unit load of Comparative Example 2 is only 60 MPa.

[0058] The second detection item is the friction and wear performance test. The composite product plates prepared in Examples 1-2 and Comparative Examples 1-2 are made into sample pieces for end face friction performance test. The size of the sample piece is 37 mm x 37 mm x δ mm (δ is the actual thickness of the plate). The test conditions are: load 15 MPa, speed 0.4 m / min, and time 3 h; the lubrication condition is: one-time greasing. The test requirements are: friction coefficient ≤0.10 and wear amount ≤0.03.

[0059] Name coefficient of friction wear amount / mm Example 1 (PEEK) 0.064 0.008 Example 2 (PPS) 0.073 0.006 Comparative Example 1 (PTFE) 0.037 0.010 Comparative Example 2 (PEEK) 0.042 0.040

[0060] Compared with the prior art, the preparation method of the self-lubricating bearing comprising the seat-type mesh provided by the present application uses the metal mesh, further uses the seat-type mesh, improves and ensures the strength of the bearing while meeting the self-lubricating performance, and the thickness of the self-lubricating bearing can be relatively thin due to the presence of the metal mesh, thereby meeting the requirements of modern seats. Specifically, the weft of the seat-type mesh is parallel to the axial direction of the bearing, which can ensure the axial strength of the lubricating material layer, the warp is perpendicular to the axial direction of the bearing and is made of tin bronze alloy, and 10% to 40% of the tin bronze alloy is exposed to the high polymer material layer, thereby ensuring the radial strength of the high polymer material layer and meeting the requirements of automobile seats and hinges on friction performance, and further the total thickness of the substrate and the high polymer material can be designed to be very thin under the requirement of meeting the strength, thereby realizing the characteristics of thin thickness and high strength. Meanwhile, in the above steps, the metal mesh forms a metal framework, and the high polymer material is uniformly distributed between the framework, thereby improving the strength of the bearing material and ensuring the wear resistance of the bearing.

[0061] The above merely describes the preferred embodiments of the present application and is not used to limit the protection scope of the present application, and any modification, equivalent replacement or improvement within the spirit of the present application is covered within the protection scope of the present application.

Claims

1. A method for preparing a self-lubricating bearing comprising a mat-type net, comprising the following steps: STEP 101: Provide a metal mesh. The metal mesh is a mat-shaped mesh comprising a plurality of parallel wefts and a plurality of warp wires wound around the wefts. The diameter of the wefts is larger than the diameter of the warp wires so that the warp wires do not deform when wound around the wefts. The warp wires are made of a tin-bronze alloy. The porosity of the metal mesh is controlled between 60% and 90%. The wefts and warp wires are sintered together. STEP 102: Providing a polymer material, injecting the polymer material onto the metal mesh and submerging the metal mesh in the polymer material to form a composite plate; STEP 103: Provide a substrate; STEP 104: heating the substrate and laying the composite plate on the substrate so that the polymer material layer adheres to the substrate; STEP 105: Cutting the polymer material layer on the other side of the substrate so that part of the warp yarns is exposed from the polymer material layer, and the exposed part of the warp yarns accounts for 10 to 40% of the total area to form a bearing blank; STEP 106: Roll the bearing blank to make a self-lubricating bearing, wherein the weft yarns are parallel to the axial direction of the self-lubricating bearing, and the warp yarns are perpendicular to the axial direction of the self-lubricating bearing.

2. The method for preparing a self-lubricating bearing comprising a mat-type net according to claim 1, wherein: The weft wire is made of one of carbon steel, manganese steel and titanium steel.

3. The method for preparing a self-lubricating bearing comprising a mat-type net according to claim 1, wherein: The tin bronze alloy is one of CuSn10, CuSn13, and CuSn8Zn3.

4. The method for preparing a self-lubricating bearing comprising a mat-type net according to claim 1, wherein: The mat-type net is one of a plain weave type, a twill weave type and a double-filament Dutch weave type.

5. The method for preparing a self-lubricating bearing comprising a mat-type net according to claim 1, wherein: The polymer material includes one or more of polyaryletherketone, modified polyetheretherketone, polyamide-imide, modified polyphenylene sulfide, polyvinylidene fluoride, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, polycaprolactam, and ultra-high molecular weight polyethylene.

6. The method for preparing a self-lubricating bearing comprising a mat-type net according to claim 1, wherein: The thickness of the metal mesh is 0.4-2 mm.

7. The method for preparing a self-lubricating bearing comprising a mat-type net according to claim 1, wherein: The thickness of the substrate is less than 1 mm.

8. The method for preparing a self-lubricating bearing comprising a mat-type net according to claim 1, wherein: In STEP 105 , the exposed tin-bronze alloy layer accounts for 10% to 40% of the total area and is complementary to the porosity of the metal mesh.

9. The method for preparing a self-lubricating bearing comprising a mat-type net according to claim 1, wherein: The temperature at which the substrate is heated should be able to melt the corresponding polymer material.

10. A self-lubricating bearing comprising a mat-type net, characterized in that: The self-lubricating bearing including a mat-type mesh includes a substrate and a self-lubricating layer fixedly arranged on the substrate. The self-lubricating layer includes a metal mesh and a polymer material layer sealed in the metal mesh. The metal mesh is a mat-type mesh, which includes multiple mutually parallel weft wires and multiple warp wires wound on the multiple weft wires. The diameter of the weft wires is greater than the diameter of the warp wires so that the warp wires do not deform when wound on the weft wires. The weft wires extend parallel to the axial direction of the self-lubricating bearing. The warp wires are made of tin bronze alloy. The porosity of the metal mesh is between 60% and 90%. The radial free surface of the self-lubricating layer is cut to expose the warp wires, and the exposed portion of the warp wires accounts for 10 to 40% of the total area.