Heat insulation method for local heat treatment of curved surface part through resistance heating

Abstract

The invention discloses a heat insulation method for local heat treatment of a curved surface part through resistance heating. The method includes the steps that S1, a target curved surface of the part is scanned by a 3D laser scanner, and three-dimensional coordinates of the target curved surface are obtained; S2, according to the obtained three-dimensional coordinates and the design blueprint ofthe target curved surface, a 3D repair model of the target curved surface is established; S3, according to the 3D repair model, a machine tool is controlled for numerical control forming of a heat insulation sheet, and the formed heat insulation sheet with the same appearance as the target curved surface is obtained; S4, according to the size of a heating zone of the target curved surface, the formed heat insulation sheet is holed, and the hole size is larger than the size of the heating zone of the target curved surface; S5, an yttrium oxide thermal barrier coating is sprayed on the internalsurface of the formed heat insulation sheet, and a bonding layer, a zirconium oxide coating and a reflecting layer are sequentially sprayed on the external surface of the formed heat insulation sheet; S6, the formed heat insulation sheet is placed between the target curved surface of the part and heating pieces, and the holes in the formed heat insulation sheet directly face the heating zone of the target curved surface; and S7, the heating pieces are opened for local heat treatment of the target part.

Description

technical field [0001] The invention belongs to the technical field of heat isolation, and in particular relates to a heat insulation method for resistance heating local heat treatment of curved surface parts. Background technique [0002] When large parts are machined to final size, if there are local surface defects (such as fluorescent defects), repair welding is required to remove the surface defects. Because repair welding will cause stress concentration at the welding position, failure to perform heat treatment after welding may lead to performance deterioration of parts in the use environment and failure failures, so heat treatment is required after welding to eliminate welding stress. Since the parts have been machined to final size, the overall heat treatment deformation is large and difficult to control, so local heat treatment is used to eliminate welding stress. [0003] Local heat treatment refers to the heat treatment method of locally heating the weld zone of...

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Problems solved by technology

[0008] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art, to provide a resistance heating local heat treatment heat insulation method for curved surface parts, so as to solve the problem of poor heating and heat insulation effect of traditional resistance heating

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