Polymer self-lubricating thin layer composite axle sleeve and its preparation method

Abstract

The invention discloses a polymer self-lubrication thin layer composite shaft sleeve and the preparation method, which is rolled by a support skeleton made of metal mesh and a polymer composite. The formation of the metal mesh can be mesh-weaving forming, two-way stretching forming, punch forming or other forming modes; the shape of the mesh can be lozenge, hexagon, round or other shapes. The invention of shaft sleeve has excellent wear resistance, water corrosion resistance and good self-lubricating property and is especially suitable to be applied in the self-lubrication liner bushings of the automobile door hinge, footrest, joy stick and automatic door and window system.

Description

technical field [0001] The invention relates to a polymer self-lubricating thin-layer composite shaft sleeve and a preparation method thereof, in particular to a multi-layer self-lubricating shaft sleeve formed by sintering and rolling metal mesh and polymer composite materials and a preparation method thereof. Background technique [0002] With the rapid development of the automobile industry, higher requirements have been put forward for the performance of the moving friction pair parts. It is required that the material not only has good self-lubricating performance and wear resistance, but also has good high temperature resistance and load resistance. ability. Metal-polymer multilayer composite materials have good thermal conductivity, high load-carrying capacity, excellent wear resistance and self-lubricating properties, and are highly valued by people, and are widely used in automotive connecting rods, shock absorbers and hydraulic cylinders. However, in order to meet ...

AI Technical Summary

Problems solved by technology

However, in order to meet the design requirements of modern automobile structures, the moving friction pairs in automobile door hinges, pedals, joysticks and automatic door and window systems need to have a large installation gap, and the lubricating materials need to have good flexibility and thinner Wall thickness to avoid deformation of the material due to creep, which is an obvious weakness for conventional multilayer composites sintered on the surface of metal-based substrates

[0003] The Chinese invention patent (publication number CN1292852A, patent name "sliding bearing") proposed by Dana Corporation of the United States sinters spherical copper alloy powder on a copper-clad steel plate at a certain temperature, and the surface is sintered with polytetrafluoroethylene (PTFE) as The polymer material of the main resin is used to manufacture bearings through the rolling process. This type of lubricating material has a high load-carrying capacity, but because the surface self-lubricating modified layer is very thin, only 0.03-0.05mm, and the wall thickness of the formed bearing can only be Above 0.75mm, the manufacturing process cannot meet the requirements for thinner wall thickness bearings.

In addition, after the surface polymer modified layer is worn under high load conditions, although it can maintain a stable wear period for a period of time, as the bearing moves for a long time, the exposed metal on the friction interface gradually increases, resulting in a sharp decline in the bearing life. Easy-to-occlude dual friction pair

[0004] Norton Pampus GmbH proposed a maintenance-free sliding bearing material (patent number USP5573846, patent name "Polyfluorocarbon Coated Metal Bearing"), which consists of a three-layer structure, the substrate is metal, and the surface lubrication modification layer is polyfluorocarbon coated. Tetrafluoroethylene, polyimide and polyether ether ketone are the main matrix materials, and a mixture of lubricants or reinforcing fillers is added. The middle layer is a polymer material mainly composed of ethylene-tetrafluoroethylene copolymer, which acts as a bond. Such materials have good self-lubricating properties and relatively good softness. However, due to the temperature resistance of the bonding layer polymer, the high temperature resistance of bearing materials is limited, and compared with copper alloys layer of self-lubricating bearings, their wear resistance is relatively poor

[0005] Pacific Bearing Co. of the United States proposed a method for preparing sliding bearings (the patent number is USP5229198, and the patent name is "Bearing Material Having a Matrix Impregnated with Polymeric Resin"). The surface of the thin-layer steel plate is rapidly heated, and a special grid The form of metal mesh is welded on the surface of the steel plate, and after cooling, PTFE modified material with good self-lubricating properties is rolled on the surface of the metal mesh, and self-sliding bearings are manufactured by sintering and rolling. This method can effectively avoid the use of adhesives Bonding metal mesh and steel plate leads to the disadvantage of poor bonding strength when forming flange flanges, which can increase the effective lubrication area of ​​the sliding surface, but it is still only suitable for sliding bearings with a wall thickness of 0.75mm or more. For wall thickness requirements Thinner bushings still don't work

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