Method for improving wear resistance of parts of high-pressure hydraulic pump

Abstract

The invention belongs to the technical field of hydraulic pump manufacturing, and particularly relates to a method for improving wear resistance of parts of a high-pressure hydraulic pump. The methodfor preparing the anti-wear high-pressure hydraulic pump through the physical vapor deposition technology for surface carburization and coating treatment, the advantages of carbide coatings, PVD methods, carburization techniques and multilayer composite structures are combined, a carburized diffusion layer is prepared by an ion sputtering method between the carbide coatings and workpiece substrates, namely, the surface carburizing treatment is performed on the surfaces of the parts by means of ion sputtering method, and then multilayer composite coatings of the HfMoZrTiC / Mo are deposited byusing an ion plating method and a magnetron sputtering composite method, the physical property difference between the coatings and substrate materials is relieved, the hardness of the substrate materials is improved, the adhesion performance of the coatings and the substrates is enhanced, the comprehensive performance such as wear resistance of the parts of the hydraulic pump is improved, and thesurface treatment efficiency and the service life of the workpieces are effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of hydraulic pump manufacturing, and in particular relates to a method for improving the wear resistance of parts of a high-pressure hydraulic pump. Background technique [0002] The hydraulic pump is the power component of the hydraulic transmission system. Its function is to convert the mechanical energy of the power machine (such as the motor and internal combustion engine) into the hydraulic energy of the oil, and provide power for the entire hydraulic system. With the rapid development of industrial technology, hydraulic pumps are gradually developing towards high pressure, high speed and large flow. Since the hydraulic pump is subjected to high and concentrated alternating loads while operating at high speed, the wear of parts in the pump is the main damage form of domestic hydraulic pumps, especially high-pressure hydraulic pumps. Therefore, improving the performance of hydraulic pump parts materials ...

AI Technical Summary

Problems solved by technology

However, if the PVD carbide coating is prepared directly on the surface of the hydraulic pump parts, due to the large difference between the substrate hardness, elastic modulus, thermal expansion coefficient and the coating material, it is impossible to obtain a PVD coating with high bonding force, making PVD coating Premature shedding and failure of layers

Chinese patent CN101058870A adopts a single PVD coating on the surface of the mold. The poor bonding force between the coating and the substrate and the poor mechanical matching between the PVD coating and the substrate are important factors that limit the advantages of PVD coatings such as high hardness and low friction coefficient.

Chinese patent CN103727180A directly prepares wear-resistant ceramic coatings and diamond coatings on the surface of carbon steel. Due to the soft hardness of the substrate, which cannot support the coating and the obvious performance difference between the substrate and the coating, the performance of the prepared coating cannot meet the requirements. Many practical requirements, especially under the conditions of high speed, heavy load and alternating load, the coating will fall off and wear quickly

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