Design method of cold spray nozzle for cold spraying

A design method and cold spraying technology, applied in the direction of calculation, spraying device, spraying device, etc., can solve the problems of long-term modeling and calculation, lack of material specificity of cold nozzles, long design time, etc., and achieve the effect of rapid design optimization

Active Publication Date: 2018-01-23
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

The nozzles designed in combination with CFD can complete the spraying work, but this method also lacks the relevant design principles of cold nozzles, and the size of each part of the nozzle needs to be changed repeatedly. The optimization process requires a long time for modeling and calculation. Therefore, the method designed Cold nozzles lack material specificity and at the same time take a long time to design

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  • Design method of cold spray nozzle for cold spraying
  • Design method of cold spray nozzle for cold spraying
  • Design method of cold spray nozzle for cold spraying

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Embodiment Construction

[0041] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0042] The cold spray nozzle design method of the present invention, the technical problem to be solved is to set up a series of design principles applicable to the cold spray nozzle, and obtain a set of complete and effective cold nozzle design methods simultaneously, thereby by influencing the nozzle size factors (gas type, The analysis of pressure, powder type, etc.) can quickly design the optimal nozzle.

[0043] In order to solve the above technical problems, the present invention proposes a nozzle design method based on the analysis of spraying materials and process parameters combined with CFD. The adopted technical solution is: S1, the original size setting process, based on the analysis and prediction of the key influencing factors on the particle velocity. Nozzle size setting; S2, two-dimensional spraying model construction process, constructing the spr...

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Abstract

The invention relates to a design method of a cold spray nozzle for cold spraying. The cold spray nozzle is a Laval spray nozzle with a round section. Firstly, a throat diameter is determined, then anoutlet diameter is determined, a spray nozzle initial size model and a simplified model after a size is modified and optimized are established by adopting modeling software, and an original outlet diameter De and a length Ld of an expansion section are optimized. According to the invention, based on a material condition and a gas condition, by analyzing characteristics of a material and gas, an initial size is selected, and then by CFD calculation, an optimal size is obtained; rapid optimal design of the cold spray nozzle can be implemented; and meanwhile, for different spraying materials andprocess conditions, special design of various spray nozzles is completed.

Description

technical field [0001] The invention belongs to the technical field of cold spraying, and in particular relates to a design method of a cold nozzle for cold spraying. Background technique [0002] In the process of cold spraying, metal particles are accelerated by supersonic airflow, hit the substrate at a high speed (300-1000m / s) and a temperature far below the melting point of the metal material, and undergo severe plastic deformation to form a coating. In this process, metal particles can only be deposited on the substrate to form a coating when they reach a critical velocity. In the cold spray system, the spray gun is the core device, and the nozzle is the core component of the spray gun, which is mainly used to accelerate the gas from subsonic velocity to supersonic velocity, and at the same time provide an acceleration channel for particles. Therefore, a reasonable nozzle structure is a key factor to ensure the particle acceleration effect, coating quality and stabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50B05B1/02
Inventor 李文亚韩天鹏杨夏炜
Owner NORTHWESTERN POLYTECHNICAL UNIV
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