Hardening method of inner surface of cylinder barrel of titanium and titanium alloy hydraulic cylinder

Abstract

The invention discloses a hardening method for an inner surface of a cylinder barrel of a titanium and titanium alloy hydraulic cylinder. The hardening method comprises the following steps: I, polishing the inner surface of the cylinder barrel of the hydraulic cylinder, then, removing greasy dirt and dehydrating; II, putting the dehydrated cylinder barrel, which is used as a cathode, of the hydraulic cylinder in a double-layer glow ion diffusion metalizing furnace, putting a graphite source electrode in the cylinder barrel of the hydraulic cylinder, in the presence of argon gas, generating glow under the high-voltage electric fields by utilizing an anode and a cathode to perform bombardment activation on the inner surface of the cylinder barrel of the hydraulic cylinder; III, after the bombardment activation is finished, introducing a gas mixture of the argon gas and oxygen gas into the double-layer glow ion diffusion metalizing furnace, generating double-layer glow under the high-voltage electric fields by utilizing the anode and the graphite source electrode as well as the anode and the cathode to perform oxyarburizing on the inner surface of the cylinder barrel of the hydraulic cylinder to obtain a composite membrane layer on the inner surface of the cylinder barrel of the hydraulic cylinder. The composite film layer prepared by the hardening method disclosed by the invention is high in bonding strength and good in wear resistance, and capable of effectively avoiding the titanium and titanium alloy occlusive locking problem.

Description

technical field [0001] The invention belongs to the technical field of titanium and titanium alloy surface hardening, and in particular relates to a method for hardening the inner surface of a titanium and titanium alloy hydraulic cylinder barrel. Background technique [0002] With the demand for titanium and titanium alloy hydraulic cylinders with high strength and good wear resistance in aerospace, shipbuilding and other fields, titanium and titanium alloy transmission parts are widely used. Usually titanium and titanium alloys have high specific strength and corrosion resistance. Excellent performance, therefore, the weight reduction and service life of aerospace parts are greatly improved. However, titanium and titanium alloys have low surface hardness, poor wear resistance, and are more sensitive to adhesive wear. When used under conditions such as high torque and heavy load, parts will fail due to local friction and wear. As the adhesion phenomenon continues to occur a...

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Problems solved by technology

[0003] At present, for the surface hardening of titanium and titanium alloys to improve the wear resistance and anti-seizing problems, many methods have emerged, such as using supersonic flame spraying WC film layer; using micro-arc oxidation to generate titanium oxide film layer, using vacuum conditions Down carburizing treatment to prepare TiC film, etc., but due to the limitation of the use environment of titanium alloy hydraulic cylinder and the complex appearance of parts, it is difficult to achieve satisfactory results

For example, supersonic flame spraying treatment is difficult to spray film on the surface of titanium and titanium alloy parts on the inner wall of deep holes. The service life of micro-arc oxidation film is short and the finish is low, and it is easy to fall off and fail under heavy load; carburizing under vacuum conditions will affect titanium. And the mechanical properties of titanium alloys limit the manufacture and use of titanium alloy hydraulic cylinders, which cannot meet the higher use requirements of titanium and titanium alloy hydraulic cylinders.

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