Temperature prediction based control method for precise forming of laser cladding thin-walled workpiece

Abstract

The invention discloses a temperature prediction based control method for precise forming of a laser cladding thin-walled workpiece, and relates to the field of laser cladding forming. The method comprises the three steps that firstly, a regression model of the influences of the powder feed speed, the scanning speed, the laser power and the substrate temperature on the weld width, weld height andaspect ratio parameters of single-channel cladding layers is set up through a response surface method; secondly, a theoretical prediction model of the relation between the cladding temperature and thenumber of the cladding layers during multi-layer cladding is set up; and thirdly, through combination of the regression model, the target weld width and weld height are adopted as compensation targets, the actual forming size is subjected to compensation, and a proper power adjusting curve is determined. According to the method, in the cladding process, the thickness of the thin-walled workpieceis stable, the height is increased stably, the condition of preset programming is met, and finally the thin-walled workpiece high in cladding quality is obtained.

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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