A Control Method for Precise Forming of Laser Cladding Thin-walled Parts Based on Temperature Prediction

Abstract

The invention discloses a control method for precise forming of laser cladding thin-walled parts based on temperature prediction, and relates to the field of laser cladding forming. The invention includes three steps. Step 1: establish powder feeding speed and scanning speed by response surface method , the regression model of the influence of laser power and substrate temperature on the parameters of fusion width, fusion height and aspect ratio of a single cladding layer; Step 2: Establish a theoretical prediction model for the relationship between cladding temperature and cladding layers during multi-layer cladding ; Step 3: Combining with the regression model, taking the target melting width and melting height as compensation targets, the actual forming size is compensated, and an appropriate power adjustment curve is determined. The invention makes the thickness of the thin-walled part stable and the height increase steadily during the cladding process, which conforms to the situation of preset programming, and finally obtains the thin-walled part with high cladding quality.

Description

technical field [0001] The invention belongs to the field of laser cladding forming, in particular to a control method for precise forming of laser cladding thin-walled parts based on temperature prediction. Background technique [0002] Laser cladding forming (LCF) is a laser rapid prototyping technology developed in recent years. This technology combines the characteristics of rapid prototyping and laser cladding surface strengthening technology, and can be widely used in the direct forming and repair of complex thin-walled parts, and has a very broad application prospect. The use of laser cladding forming technology has unique advantages such as processing complex parts, high degree of flexibility and close-range forming. [0003] In particular, laser cladding forming technology has more obvious advantages in processing thin-walled parts. When processing thin-walled parts such as aeroengine impeller blades by traditional subtractive methods, there are disadvantages such...

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Problems solved by technology

[0005] In the existing method, the power of the laser is adjusted according to the height of the cladding layer to achieve the purpose of stabilizing the growth of the cladding layer. However, if the laser power is judged only by the height, the thickness of the thin wall will become unstable.

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