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Preparation method of wear-resistant hydraulic pump part

A technology of hydraulic pumps and parts, which is applied in the field of preparation of wear-resistant hydraulic pump parts, can solve the problems of mechanically matching PVD coatings with high hardness and low hardness, unsatisfactory performance of coatings, and inability to obtain PVD coatings, etc., so as to improve physical machinery performance, improvement of anti-oxidation performance, effect of improvement of matching performance

Active Publication Date: 2019-12-27
JINING ANTAI MINING EQUIP MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 CN103727180 A directly prepared a wear-resistant ceramic coating and a diamond coating on the surface of carbon steel. Due to the soft hardness of the substrate, the coating could not be supported and the obvious performance difference between the substrate and the coating resulted in poor performance of the prepared coating. Meet many practical requirements, especially under the conditions of high speed, heavy load and alternating load, the coating will fall off and wear quickly

Method used

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  • Preparation method of wear-resistant hydraulic pump part

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Effect test

Embodiment 1

[0027] In the wear-resistant hydraulic pump and its preparation method according to the present invention, the base material of the hydraulic pump parts is 40Cr, and the base material of the hydraulic pump parts is subjected to carburizing treatment by ion plating after quenching, high temperature tempering and rough finishing, and then through The combined method of ion plating and magnetron sputtering is used to deposit HfCrMoC carbide coating on the surface. During deposition, 2 C ion plating targets, 1 Hf magnetron sputtering target, 1 Cr magnetron sputtering target and 1 Mo magnetron are used. Sputtering target; Concretely comprises the following steps:

[0028] (1) Part matrix processing: part matrix blank→quenching (860~880℃, water cooling)→high temperature tempering (540~550℃, water cooling)→rough machining→semi-finishing→stress relief tempering (500~530℃, Air cooling)→finishing (surface roughness Ra1.6μm, processing size: lower limit of tolerance);

[0029] (2) Part ...

Embodiment 2

[0038] In the wear-resistant hydraulic pump and its preparation method according to the present invention, the base material of the hydraulic pump parts is 20Cr2Mo, and the base material of the hydraulic pump parts is subjected to quenching, high-temperature tempering, rough and fine machining, and then carburized by ion plating, and then passed through The combined method of ion plating and magnetron sputtering is used to deposit HfCrMoC carbide coating on the surface. During deposition, 2 C ion plating targets, 1 Hf magnetron sputtering target, 1 Cr magnetron sputtering target and 1 Mo magnetron are used. Sputtering target; Concretely comprises the following steps:

[0039] (1) Part matrix processing: part matrix blank→quenching (910~930℃, oil quenching)→high temperature tempering (560~620℃, air cooling)→rough machining→semi-finishing→stress relief tempering (550~600℃ , oil cooling)→finishing (surface roughness Ra1.6μm, processing size: lower limit of tolerance);

[0040] (...

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Abstract

The invention belongs to the technical field of hydraulic pump manufacturing, and particularly relates to a preparation method of a wear-resistant hydraulic pump part. A carbide coating, a PVD methodand a carburizing technology are combined, a carburizing diffusion layer is prepared between the carbide coating and a part substrate through an ion sputtering method, namely, the surface of the partis subjected to a surface carburizing treatment by the ion sputtering method, and then a composite method of ion plating and magnetron sputtering is used for depositing a HfCrMoC carbide coating withcomponents in gradient change. The preparation method can slow the physical property difference between the carbide coating and the base material of the hydraulic pump part, improve the surface hardness and support effect of the base material, has high surface hardness and core toughness, and has a smooth surface and high wearing resistance; the adhesion between the coating and the substrate can be enhanced by 100% or more, the surface hardness of the invention is increased by two times or more, the surface treatment time is reduced by 80% or more, the service life of the hydraulic pump is doubled or more, and the maintenance and care cost of the hydraulic pump is reduced by 50% or more.

Description

technical field [0001] The invention belongs to the technical field of hydraulic pump manufacturing, and in particular relates to a preparation method of wear-resistant hydraulic pump parts. 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 is a development One of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/06C23C14/35C23C14/02C23C28/04C23C8/38C23C8/02C21D9/00C21D1/18
CPCC23C14/0635C23C14/352C23C14/02C23C8/38C23C8/02C21D9/0068C21D1/18C23C28/04
Inventor 宋文龙安磊张利王首军
Owner JINING ANTAI MINING EQUIP MFG CO LTD
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