Method for size restoring and reinforcing of outer wall and inner wall of water-cooling cylinder sleeve of engine

Abstract

The invention relates to a method for size restoring and reinforcing of an outer wall and an inner wall of a water-cooling cylinder sleeve of an engine. According to the method, a nickel-based anti-attrition and wear-resistant coating is prepared on the inner wall of the cylinder sleeve by utilizing an inner hole plasma spraying technique, and a nickel-aluminum composite coating is prepared on the outer wall of the cylinder sleeve by utilizing an supersonic speed plasma spraying technique. The cylinder sleeve scrapped due to the abrasion and the corrosion can be remanufactured, and the size of the cylinder sleeve is restored according to the actual requirement; meanwhile, the abrasion performance of the inner wall as well as the corrosion resistance of the outer wall of the cylinder sleeve are improved, the service life is prolonged, the remanufacture possibility is improved, the restoring cycle is reduced, and the energy, the fund and the labor force are saved.

Description

technical field [0001] The invention relates to the field of equipment remanufacturing, in particular to a method for restoring and strengthening the dimensions of the outer wall and inner wall of an engine water-cooled cylinder liner. Background technique [0002] The engine is the power source of the vehicle, and the cylinder liner is the key component of the engine. It forms the space for gas compression, combustion and expansion, and guides the piston. In addition, it transfers part of the heat in the cylinder to the cooling medium. [0003] At present, most diesel engines use a wet cylinder liner, the inner surface of which is closely matched with the piston ring. In the harsh combustion environment with a maximum explosion pressure of 95 bar, a maximum gas temperature of about 2000°C, and an intake air temperature below 100°C, the piston ring It performs high-speed reciprocating frictional motion with the inner surface of the cylinder liner at a relative pressure of u...

AI Technical Summary

Problems solved by technology

The material of the new cylinder liner and the existing surface treatment methods and repair methods cannot well solve the fundamental problems of high temperature corrosion wear on the inner surface of the cylinder liner and cavitation on the outer surface; generally the service life of the repaired cylinder liner is lower than that of the new liner life

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