Laser drilling method of titanium alloy with coating

Abstract

The invention relates to a laser drilling method of titanium alloy with a coating, belonging to the technical field of laser application. The method is mainly applied to the small hole molding of titanium alloy (TC11) parts with coatings of aircraft engines, wherein the bottom layer of the coating is nickel-aluminum and the surface material of the coating is aluminum trioxide-titanium dioxide. The laser drilling method of titanium alloy with a coating can effectively prevent the dropping off of the coatings on the peripheries of small holes, guarantee the processing quality, improve the processing efficiency and process small holes with diameters larger than 0.3mm. The method comprises the following steps of: (1) fixing titanium alloy with a coating on a working table of laser equipment and ensuring that a laser emitting head of the laser equipment is aligned to a pre-drilling position of the titanium alloy with a coating; (2) setting parameters of the laser equipment according to the thickness of the titanium alloy with a coating; (3) releasing inert gas argon to the pre-drilling position; and (4) starting the laser equipment to emit laser beams to the pre-drilling position of the titanium alloy with a coating.

Description

Technical field: [0001] The invention belongs to the technical field of laser application, in particular to a laser drilling method for a coated titanium alloy; it is mainly applied to an aero-engine with a coating (the bottom layer of the coating material is nickel-aluminum, and the surface layer material is aluminum oxide titanium dioxide ) Small hole forming of titanium alloy (TC11) parts. Background technique: [0002] At present, there are two methods for processing small holes: 1. EDM; 2. Drilling. Among them, the EDM method requires the material to be processed to be conductive; since the aluminum oxide and titanium dioxide coating materials are not conductive, this method cannot be used to drill holes in coated titanium alloys. In the drilling process, a huge force will be generated between the tool and the part during the drilling process, which can easily cause the coating to fall off. Moreover, when machining a small hole with a diameter below 2mm, the drill bit...

AI Technical Summary

Problems solved by technology

Among them, the EDM method requires the material to be processed to be conductive; since the aluminum oxide and titanium dioxide coating materials are not conductive, this method cannot be used to drill holes in coated titanium alloys

In the drilling process, during the drilling process, a huge force will be generated between the tool and the part, which will easily cause the coating to fall off.

Moreover, when machining a small hole with a diameter below 2mm, the drill bit is too thin, and the drill bit is easy to break, making the part size out of tolerance, and even causing the part to be scrapped

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