Machining method for aero-engine part sealing coating

Abstract

The invention discloses a machining method for an aero-engine part sealing coating. The machining method comprises the steps that a part to be machined is fixed to a numerical control machine tool after spraying is completed; then a hard alloy milling cutter is selected, and parameters of the numerical control machine tool are set; climb milling is conducted through the side edge of the hard alloy milling cutter; the cutting anterior angle and the relief angle are greater than three degrees, and the coating surface of the part to be machined is subjected to milling machining. Due to the fact that climb milling is conducted through the side edge of the hard alloy milling cutter and the cutting anterior angle and the relief angle are greater than three degrees, cutter cutting is in a shearing state and the coating is machined, the cutting force is reduced, and coating particles are prevented from falling down. Meanwhile, the relative grinding efficiency of the same milling mode is greatly improved, coating chip-falling can be avoided and the machining efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of aero-engine manufacturing, in particular to a processing method for sealing coatings of aero-engine parts. Background technique [0002] The rotating parts and stationary parts of the aero-engine parts need to be sealed. The sealing part is realized by the small gap contact between the rotating part and the stationary part. One end of the contact part is the part's grate, and the other end is a coated surface. The surface of the coating is generally achieved by spraying on the part substrate. After analyzing the structure and characteristics of the coating material, the commonly used nickel-aluminum coating is made of 70% nickel powder plus 30% aluminum powder through special spraying. The equipment is sprayed on the surface of the part, and the formed structure is a multi-layer scale-like porous structure with a large number of holes, and the mechanical surface is anisotropic. Therefore, it is different...

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Problems solved by technology

[0003] The usual machining method is turning or grinding. The advantage of turning is that it is convenient. However, during the turning process, the tip of the turning tool slides perpendicular to the surface of the part. Due to the large cutting force, it is very difficult for loose coatings. Strong peeling effect, easy to produce defects such as block loss and surface color difference. When the coated surface cannot meet the requirements of the final part, the coating needs to be removed and re-sprayed. Due to the high price of powder spraying, the manufacturing cost of parts will be greatly increased

Grinding is processed with a very small amount of cutting, and the processing method is grinding, because the cutting amount is small and the cutting force is small, so the grinding effect is good, and it is not easy to produce blocks and surface color difference, but the processing efficiency of grinding is very low , unable to meet production demand

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