On-line diagnosis method for defects in laser material increasing manufacturing process on basis of spectrum diagnosis

Abstract

The invention provides an on-line diagnosis method for defects in a laser material increasing manufacturing process on the basis of spectrum diagnosis. The method comprises the following steps: adjusting the position of a fiber probe; when a metal direct depositing system based on coaxial powder feeding begins to work, acquiring laser induced plasma spectrum signals generated in a manufacturing process by the fiber probe and feeding the spectrum signals into a computer via a fiber spectrometer; observing conditions of fluctuation of relative radiation intensities of plasmas with different wavelengths along with time in real time and determining a characteristic spectral line used as an analyzing object; filtering a characteristic spectral line relative radiation intensity time-domain figure; judging whether relative radiation intensities of the characteristics spectral line in a laser material increasing manufacturing process rapidly fluctuate or change or not on the basis of the selected characteristic spectra line time-domain figure or filtering images; if the relative radiation intensities of the characteristics spectral line in the laser material increasing manufacturing process rapidly fluctuate or change, showing that manufacturing defects exist; and if the relative radiation intensities of the characteristics spectral line in the laser material increasing manufacturing process do not rapidly fluctuate or change, showing that the manufacturing defects do not exist. By the diagnosis method, generation and appearing time of the defects in the laser material increasing manufacturing process and defect types can be judged rapidly and accurately.

Description

technical field [0001] The invention relates to the field of laser additive manufacturing, in particular to an online diagnosis method for defects in the laser additive manufacturing process based on spectrum diagnosis. Background technique [0002] With the continuous update and development of laser additive manufacturing technology, it has been widely used in product research and development in household appliances, light industry, automobiles and other fields. Individual indicators can meet the corresponding standards and specifications of homogeneous materials, but there are still certain gaps and many unavoidable molding defects in general. The main reason is that the "transient melting process" caused by additive manufacturing technology forming Microscopic defects inside the part (such as cracks, pores, slag inclusions, slump, etc.), and defects caused by additive manufacturing process parameters or equipment (such as holes, welding spots, severe oxidation, etc.). Ev...

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Problems solved by technology

[0005] The above research uses various methods to carry out spectral diagnosis and detection on the welding process, cladding process and additive manufacturing process. However, there is no literature or method to study the additive manufacturing defects in the laser additive manufacturing process.

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