A Deformation Compensation Method for Thin Plate Parts by HVOF Spraying

Abstract

The invention relates to a thermal spraying sheet type part deformation compensation method, in particular to a high velocity oxy-fuel sheet type part deformation compensation method. In the sheet type part high velocity oxy-fuel coating process, part deformation is caused by reasons of heat input and particle impact, the manner that high velocity oxy-fuel high-melting metal oxide treatment is carried out on the sheet type part non-spraying surface is adopted, the oxide melting point, the particle size and the technological process parameters are controlled, under the condition that metallic oxide deposition is not achieved, the part deformation process of the sheet type part high velocity oxy-fuel coating during heat input and particle impact is simulated to the maximum degree, and deformation compensation of the sheet type part obtained after coating spraying is achieved. The method effectively solves the problem that deformation offset compensation of the high velocity oxy-fuel sheet type part through methods such as metal plate, heat treatment and shot blasting are adopted for is difficult, and high velocity oxy-fuel sheet type part deformation compensation is achieved.

Description

technical field [0001] The invention relates to a deformation compensation method of thermal sprayed thin plate parts, in particular to a deformation compensation method of supersonic flame sprayed thin plate parts. Background technique [0002] High Velocity Oxy Fuel (HVOF for short) is a new type of thermal spraying technology developed on the basis of ordinary flame spraying in the early 1980s. It uses hydrogen, acetylene, propylene, kerosene, etc. as fuel, uses oxygen as a combustion aid, burns in a combustion chamber or a special nozzle, and produces a supersonic flame, and at the same time sends the powder into the flame to produce molten or semi-molten Particles, impacted at high speed, are deposited on the surface of the substrate to form a coating. Low flame flow temperature and fast speed are two important characteristics of supersonic flame spraying. It has significant advantages in spraying tungsten carbide / cobalt cermets and metal and its alloy coatings. During...

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Problems solved by technology

[0004] However, with the continuous expansion of supersonic flame spraying technology in application fields and application parts, certain problems have gradually been exposed when supersonic flame spraying coatings are applied on parts of different shapes.

For example, when a thin-plate-shaped part is sprayed with a coating by supersonic flame, due to the heat input of the flame to the part and the impact of the sprayed particles on the part, etc., it often causes a certain deformation of the thin-plate-shaped part after supersonic flame spraying, which affects the thickness of the thin plate. The flatness of the sprayed surface of the shaped parts, if the deformation caused by this spraying is not effectively controlled and compensated, it will often affect the subsequent assembly and use of the parts, and even cause the parts to be scrapped

The traditional methods for deformation compensation of thin plate parts include sheet metal, heat treatment, reverse shot peening, reverse spraying, etc., but each method has its own shortcomings

Using the sheet metal method to reversely deform the thin-plate-shaped parts can restore the flatness of the thin-plate-shaped parts, but excessive reverse deformation can easily cause defects such as cracks in the sprayed surface coating and even cause cracking and peeling of the coating. It has an adverse effect on the quality of the sprayed coating; although the heat treatment method can relax the stress of the thin plate-shaped parts and restore and compensate the deformation of the parts to a certain extent, the degree of compensation for the deformation of the parts is limited, and it is difficult to perform equivalent compensation for the deformation of the parts. Large, and for titanium alloy, aluminum alloy and other material parts, it is also limited by the heat treatment temperature; the method of reverse shot peening can realize the deformation compensation of thin plate-shaped parts, but due to the difference in the deformation generation method of the thin-plate-shaped parts in the spraying process , the reverse shot peening method also has certain difficulties in achieving equivalent compensation for the deformation of thin plate parts, especially when the shot peening coverage reaches 100%, the degree of subsequent deformation compensation will become extremely limited, while the reverse shot peening The shot method also adds a treatment process for the parts, which increases the complexity of the parts processing; although the method of reverse spraying in the same way can effectively compensate for the spraying deformation of the thin-plate-shaped parts, it will cause the non-sprayed surface of the thin-plate-shaped parts to deposit a coating. Thus affecting the dimensional tolerance of thin-plate-shaped parts, it also has an adverse effect on the subsequent assembly and use of parts

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