A polyaryletherketone composite sliding bearing and a method for manufacturing the same

Abstract

The present application provides a kind of polyaryletherketone composite sliding bearing and its manufacturing method.The present application is stainless steel tile base bearing sector, the concave surface of the concave-convex surface on tile base is composed of a plurality of transverse grooves and a plurality of longitudinal grooves, a plurality of transverse grooves are arranged at equal intervals, the surface edge of steel base body is a copper powder layer, and the polyaryletherketone plastic layer is laid on the steel base layer and the copper powder layer.The rough surface of the concave-convex surface on the middle part of the tile base and the sintered copper powder combined with the edge part of the present application is combined with the unique adhesive formed after the polyaryletherketone is melted, which enhances the overall tearing strength and bonding degree of the polyaryletherketone plastic layer and the stainless steel tile base;Moreover, the composite sliding bearing obtained by the manufacturing method of the present application not only has good wear resistance, impact resistance, low friction, self-lubricating and other characteristics, but also solves the bottleneck existing in the prior art.

Description

Technical Field

[0001] This invention relates to the technical field of sliding bearing manufacturing, and in particular to a polyaryletherketone composite sliding bearing and its manufacturing method. Background Technology

[0002] Composite material bearings are the mainstream product of sliding bearings. They are made by combining a substrate and an engineering plastic layer through certain processes. In order to achieve better bonding, some sliding bearings on the market have crisscrossing grooves machined into the stainless steel substrate, and then a rolled polyaryletherketone plastic is applied on top. The stainless steel substrate and the polyaryletherketone plastic layer are then bonded together by high-temperature melting to form an integrated composite plate with a reliable physical connection. Finally, the sliding bearing product is manufactured through a series of processes. This connection structure has a long processing time and high processing difficulty, and it can also bring certain edge effect concentration problems to the sliding bearing.

[0003] There are also PTFE-steel composite bearings, which are made by sintering one or more layers of copper powder onto a steel plate to form a porous intermediate layer. Then, PTFE resin powder is laid flat on the copper powder layer and rolled and sintered at high temperature to form a composite material sheet. After a series of processing steps, it becomes a composite bearing product. However, this type of composite sliding bearing, which is made by connecting the copper powder with copper powder, is limited to using steel plates of a certain thickness and cannot use thick stainless steel bases. Moreover, the high temperature resistance of PTFE is relatively poor. Therefore, this type of sliding bearing will be subject to certain limitations in high-temperature and heavy-load operating conditions. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a polyaryletherketone composite sliding bearing and its manufacturing method, specifically relating to a sliding bearing made of modified polyaryletherketone metal-plastic composite material and its manufacturing method. This product is suitable for use in mechanical equipment such as nuclear main pumps, hydroelectric generators, wind power systems, gearboxes, and ships, solving the technical problems of low production efficiency, high production costs, and edge stress concentration in current technologies. The technical means employed in this invention are as follows:

[0005] A method for manufacturing a polyaryletherketone composite sliding bearing includes the following steps:

[0006] Step 1: Design a composite molding mold based on the shape and size of the stainless steel tile base blank;

[0007] Step 2: Create several dovetail groove structures with concave and convex surfaces in the middle part of the steel substrate surface;

[0008] Step 3: Evenly spread a layer of spherical copper powder of different specifications on the edge of the tile base on the fan-shaped surface of the steel substrate, 4-5 mm away;

[0009] Step 4, sintering under a reducing or inert atmosphere to form a porous copper powder layer;

[0010] Step 5, drying the polyaryletherketone powder or modified polyaryletherketone powder to be used at a preset temperature for a period of time;

[0011] Step 6, laying the dried polyaryletherketone powder or modified polyaryletherketone powder on the surface of the steel base, and closing the mold;

[0012] Step 7, applying a pressure of 30-50 MPa on the press, and after applying the pressure, placing it in a heating furnace and heating to 350-400℃;

[0013] Step 8, removing the heated mold from the heating furnace and placing it on the press, applying a pressure of 30-60 MPa while maintaining the pressure, cooling, and demolding to obtain a polyaryletherketone metal plastic composite plate with a thickness of 0.1-1.5 mm, and then processing a series of processes to obtain a composite bearing.

[0014] Further, in step 2, the concave-convex surface is located on the upper surface of the stainless steel tile base, and the thickness of the polyaryletherketone plastic layer on the concave-convex surface of the upper surface of the stainless steel tile base is 1.5-5 mm, and the convex surface of the concave-convex surface is roughened by sandblasting or other roughening treatment to form a rough surface.

[0015] Further, the material of the spherical copper powder is Qsn8-3 spherical tin bronze, and the fineness is 20-60 mesh. The spherical powder is uniformly laid at the edge position of the steel base with dovetail groove, and sintering is carried out in a sintering atmosphere of a mixture of nitrogen and hydrogen gas with a volume ratio of 1:3.

[0016] Further, for the concave-convex surface of the upper surface of the stainless steel tile base, in step 4, the amount of polyaryletherketone powder required for the upper and lower surfaces of the stainless steel tile base is calculated and weighed respectively.

[0017] The application also discloses a sliding bearing prepared by the above manufacturing method, wherein the tile base body is fan-shaped, comprising a steel base layer, a copper powder layer and a polyaryletherketone plastic layer, a plurality of concave-convex surfaces are arranged at the center position of the steel base, the surface edge of the steel base is a copper powder layer, and the polyaryletherketone plastic layer is laid on the steel base layer and the copper powder layer.

[0018] Further, the concave-convex surface of the middle part of the tile base and the rough surface of the sintered copper powder combined with the edge part are combined with the unique adhesion formed after the polyaryletherketone is melted, which enhances the tearing strength and the combination degree of the polyaryletherketone plastic layer and the overall stainless steel tile base.

[0019] Compared with the prior art, the polyaryletherketone metal plastic integrated composite material bearing of the application has the unique adhesion formed after the polyaryletherketone is melted, which enhances the tearing strength and the combination degree of the polyaryletherketone plastic layer and the overall stainless steel tile base. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 It is a structural schematic diagram of the stainless steel tile base of the present application. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0023] The embodiments of the present application disclose a manufacturing method of a polyaryletherketone composite material sliding bearing, which comprises the following steps:

[0024] Step 1, according to the shape and size of the stainless steel tile base blank, a compound forming die is designed, the compound forming is carried out, the die material is P20 die steel, and the die is provided with an exhaust passage;

[0025] Step 2, a plurality of dovetail groove structures with concave-convex surfaces are manufactured at the middle part of the surface of the steel base, specifically, the concave-convex surface-dovetail groove can be planed by a lathe;

[0026] Step 3, different specifications of mixed spherical copper powder are uniformly laid on the edge position of the tile base surface on the steel base, that is, the outermost circle in the formula: Figure 1

[0027] Step 4, the combined structure is sintered in a reducing or inert atmosphere to form a porous copper powder layer;

[0028] Step 5, according to the calculation and weighing of different thicknesses, the polyaryletherketone powder or modified polyaryletherketone powder to be used is dried at a preset temperature for a period of time; specifically, it is dried at a temperature of 120℃ for more than 8 hours to avoid defects such as pores after sintering of the powder;

[0029] Step 6, after the stainless steel tile base is cleaned and dried, it is placed in the concave die, and the dried polyaryletherketone powder is laid flat on the stainless steel tile base in the concave die cavity, and then scraped and the mold is closed;

[0030] Step 7, a pressure of 30-50Mpa is applied on the press, after the pressure is applied, it is placed in a heating furnace and heated to 350-400℃; in this embodiment, a pressure of 40Mpa is applied on the press, after the pressure is applied, it is placed in a heating furnace and heated to 360℃, so that the polyaryletherketone is in a viscous flow state, and the heating time is determined according to the size of the workpiece and the size of the mold;

[0031] Step 8, the heated mold is removed from the heating furnace and placed on the press, a pressure of 30-60MPa is applied, pressure is maintained at the same time, cooling is carried out, and the mold is opened, thereby a polyaryletherketone metal plastic composite plate with a thickness of 1.5-5mm is obtained, and after a series of processing, a composite material bearing is obtained. In this embodiment, a pressure of 50MPa is applied.

[0032] Further, in step 2, the concave-convex surfaces on the upper surface of the stainless steel tile base and the polyaryletherketone plastic layer on the concave-convex surface of the upper surface of the stainless steel tile base have a thickness of 1.5-5mm, and the convex surface of the concave-convex surface can be roughened by sandblasting or other roughening treatments.

[0033] Further, the spherical copper powder is Qsn8-3 spherical tin bronze with a fineness of 20-60 mesh, and the spherical powder is uniformly laid on the edge position of the dovetail groove steel base, and sintering is carried out in a sintering atmosphere of a mixture of nitrogen and hydrogen gas with a volume ratio of 1:3.​

[0034] Further, for the concave-convex surface on the upper surface of the stainless steel tile base, the amount of polyaryletherketone powder required for the upper and lower surface portions of the stainless steel tile base is calculated and weighed separately in step 4.

[0035] The application also discloses a sliding bearing prepared by the manufacturing method, wherein the tile base body is a fan shape, and comprises a steel base layer, a copper powder layer and a polyaryletherketone plastic layer; a plurality of concave-convex surfaces are arranged at the center of the steel base, and a copper powder layer is arranged around the edge of the surface of the steel base; and the polyaryletherketone plastic layer is arranged on the steel base layer and the copper powder layer.

[0036] Further, the stainless steel tile base is in a fan shape, the concave-convex surface on the upper surface of the tile base is composed of a plurality of transverse grooves and a plurality of longitudinal grooves; the plurality of transverse grooves are arranged at equal intervals, the interval between adjacent transverse grooves is 6-10 mm, the width of the groove mouth of the transverse groove is 4-12 mm, the width of the groove bottom of the transverse groove is 0.5-1 mm larger than the width of the groove mouth of the transverse groove, and the depth of the transverse groove is 1-5 mm; the plurality of longitudinal grooves are arranged at equal intervals, the interval between adjacent longitudinal grooves is 6-10 mm, the width of the groove mouth of the longitudinal groove is 4-12 mm, the width of the groove bottom of the longitudinal groove is 0.5-1 mm larger than the width of the groove mouth of the longitudinal groove, and the depth of the longitudinal groove is 1-5 mm.

[0037] Comparative Example 1

[0038] Different from the embodiment of the application, step 3 and step 4 of the embodiment 1 are cancelled in the comparative example 1, that is, the polyaryletherketone powder or the modified polyaryletherketone powder is directly laid on the concave-convex surface.

[0039] The composite material bearings manufactured by the embodiment 1 and the comparative example 1 are subjected to the bonding strength test, and the results are shown in Table 1.

[0040] Table 1

[0041] Test item Example 1 Comparative Example 1 Compressive shear strength 22.7 MPa 16.3 MPa Tensile strength 12.65 MPa 6.2 MPa

[0042] As shown by the test results in Table 1, the composite material bearing manufactured by the embodiment 1 has greater bonding and tearing strength than the composite material bearing manufactured by the comparative example 1, and the problem of edge effect concentration is solved.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of manufacturing a polyaryletherketone composite sliding bearing, characterized in that, It comprises the following steps: Step 1: design the compound forming die according to the shape and size of the stainless steel tile base blank; Step 2: manufacture a plurality of dovetail groove structures with concave-convex surfaces in the middle part of the surface of the steel base; Step 3: evenly spread a layer of mixed spherical copper powder of different specifications on the edge of the tile base on the surface of the steel base 4-5 mm; Step 4: sintering under reducing or inert atmosphere to form a porous copper powder layer; Step 5: dry the polyaryletherketone powder or modified polyaryletherketone powder to be used at a predetermined temperature for a period of time; Step 6: spread the dried polyaryletherketone powder or modified polyaryletherketone powder on the surface of the steel base, and close the die; Step 7: apply a pressure of 30-50 MPa on the press, then put it into the heating furnace and heat it to 350-400℃; Step 8: remove the heated die from the heating furnace and place it on the press, apply a pressure of 30-60 MPa, and cool it while maintaining the pressure, then demould to obtain a polyaryletherketone metal plastic composite plate with a thickness of 0.1-1.5 mm, and further process it to obtain a composite bearing.

2. The method of producing a polyaryletherketone composite sliding bearing according to claim 1, characterized by In step 2, the concave-convex surfaces are located on the upper surface of the stainless steel tile base, and the thickness of the polyaryletherketone plastic layer on the concave-convex surfaces of the upper surface of the stainless steel tile base reaches 1.5-5 mm, and the convex surfaces of the concave-convex surfaces are roughened by sandblasting or other roughening treatments.

3. The method of producing a polyaryletherketone composite sliding bearing according to claim 1, characterized by The spherical copper powder is Qsn8-3 spherical tin bronze with a fineness of 20-60 mesh, and is evenly spread on the edge of the steel base with dovetail grooves.

4. The method of producing a polyaryletherketone composite sliding bearing according to claim 1, characterized by Sintering is carried out in a mixed gas atmosphere of nitrogen and hydrogen with a volume ratio of 1:

3.

5. The method of producing a polyaryletherketone composite sliding bearing according to claim 1, characterized by For the concave-convex surfaces of the upper surface of the stainless steel tile base, the amount of polyaryletherketone powder required for the upper and lower surfaces of the stainless steel tile base is calculated and weighed respectively in step 4.

6. The sliding bearing manufactured by the manufacturing method of any one of claims 1-5.

7. The plain bearing according to claim 6, characterized in that The tile base body of the sliding bearing is fan-shaped, comprising a steel base layer, a copper powder layer, and a polyaryletherketone plastic layer, a plurality of concave-convex surfaces are arranged at the center of the steel base, and a copper powder layer is arranged around the edge of the surface of the steel base, and the polyaryletherketone plastic layer is arranged on the steel base layer and the copper powder layer.

8. The plain bearing according to claim 7, characterized in that The stainless steel tile base is fan-shaped, the concave surfaces of the concave-convex surfaces on the tile base are composed of a plurality of transverse grooves and a plurality of longitudinal grooves, the transverse grooves are arranged at equal intervals, the interval between adjacent transverse grooves is 6-10 mm, the width of the groove mouth of the transverse groove is 4-12 mm, the width of the groove bottom of the transverse groove is 0.5-1 mm larger than the width of the groove mouth, and the depth of the transverse groove is 1-5 mm, the longitudinal grooves are arranged at equal intervals, the interval between adjacent longitudinal grooves is 6-10 mm, the width of the groove mouth of the longitudinal groove is 4-12 mm, the width of the groove bottom of the longitudinal groove is 0.5-1 mm larger than the width of the groove mouth, and the depth of the longitudinal groove is 1-5 mm.

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