A preparation method of a shape-memory self-lubricating liner material, and a friction-reducing method for fixing the inner spherical surface of a shell by a spherical bearing

Abstract

The invention provides a preparation method of a shape-memory self-lubricating liner material and a method for reducing friction of an inner spherical surface of a spherical bearing fixing shell, and relates to the technical field of friction-reducing materials. The preparation method provided by the invention comprises the following steps: mixing an epoxy resin matrix, a multifunctional curing agent and a tertiary amine accelerator to obtain a shape-memory epoxy resin solution; mixing the shape-memory epoxy resin solution with a solid lubricant mixed with the lubricant to obtain a lubricant dispersion system; the fiber fabric is impregnated in the lubricant dispersion system to obtain a composite fiber fabric; the composite fiber fabric is placed in a mold for pressure sintering, and the shape-memory self- Lubricate gasket material. When the shape-memory self-lubricating liner material prepared by the present invention is applied to the spherical support to fix the inner spherical surface of the shell, it can completely eliminate the large stress concentration caused by the liner material changing from a plane to a spherical surface, so that the peeling strength can be improved, and at the same time, the bonding The surface is more attached and smooth, which improves the yield.

Description

technical field [0001] The invention relates to the technical field of friction-reducing materials, in particular to a method for preparing a shape-memory self-lubricating liner material and a method for reducing friction by using a spherical bearing to fix the inner spherical surface of a shell. Background technique [0002] Due to its compact structure, strong bearing capacity and high control precision, the spherical bearing is a key component in the rod end connection and transmission system of large equipment. Since the contact spherical surface of the fixed shell of the spherical bearing and the movable terminal are made of hard metal, when they are in direct contact and rub against each other, the coefficient of friction is very high, resulting in excessive friction torque or even occlusal scratches. If oil and coating are used for lubrication, its microscopic deformation can easily destroy the lubricating film, resulting in local contact of the friction surface; at t...

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Problems solved by technology

Chinese patent CN200510041149.5 relates to a self-lubricating bearing material, which uses a thermoplastic polyimide-based self-lubricating bearing material. Although it has a low friction coefficient and a high PV value, the material is a hard rigid material, and the large-sized curved surface or Spherical surface molding is difficult, especially for the special situation of "small mouth and big belly" in the spherical surface of the fixed shell of the spherical support. Hard and rigid materials cannot enter the internal cavity, so it is currently impossible to realize the inner spherical surface of the fixed shell. Anti-friction optimization

Chinese patent CN201010512653.X discloses an aluminum-based composite material with an ultra-low friction coefficient. The invention achieves an ultra-low friction coefficient by spraying a molybdenum disulfide dry film lubricating layer on the surface of the aluminum oxide hardened film. Due to the local instantaneous super high load on the surface of the friction pair of the support, it is easy to rub off and lose the lubrication effect or even cause an accident

Chinese patent 201110264954.X discloses a composition for treating friction pairs. This composition can effectively remove friction deposits on the surface of the friction pair and the wear concave surface, and form high hardness and ultra-low coefficient of friction on the surface of the friction pair. The self-healing protective ceramic layer improves the service life of the friction pair, which is similar to spraying molybdenum disulfide dry film on the surface. This anti-friction treatment also cannot be applied to the yin and yang pendulum balls of the spherical bearing due to its relatively low load-bearing capacity.

Since the existing anti-friction materials contain a large amount of lubricants such as polytetrafluoroethylene, its setting and deformation require high-temperature heat treatment above 350°C, which poses a severe test to the stability of the anti-friction materials; more importantly, The anti-friction material obtained by the shaping treatment cannot completely eliminate the internal stress during the bonding process, and still has local warping, dislocation, deformation and other poor bonding phenomena, which reduces the yield and product reliability, and is also suitable for spherical bearings. The bonding process of self-lubricating gasket materials presents great technical challenges

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