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

A laser additive, manufacturing process technology, used in materials excitation analysis and other directions

Active Publication Date: 2017-01-25
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

Examples

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Effect test

Embodiment 1

[0043] In this example, the schematic diagram of the additive molding object formed by laser additive manufacturing is as follows: image 3 As shown in (a), the molding layer 10 is divided into a first area A, a second area B, and a third area C, and the molding layer 10 in the first area A and the third area C is protected by Ar during the manufacturing process. Ar shielding gas 9 is used for protection, while the molding layer 10 of the second region B is not protected by Ar shielding gas 9 during the manufacturing process. This situation is to simulate the situation when the shielding gas changes greatly during the production process.

[0044] During the manufacturing process of laser additive materials, the optical fiber probe 3 is used to collect the photoplasma spectral information in the wavelength range of 200~1100nm in the laser additive manufacturing process, and the above spectral information is sent to the computer 2 through the optical fiber spectrometer 1 , Throu...

Embodiment 2

[0048] In this embodiment, the schematic diagram of the additive molding object formed by laser additive manufacturing is as follows Image 6 As shown in (a), the molding layer 10 is divided into a fourth area D, a fifth area E, a sixth area F and a seventh area G, and the molding layer 10 in the fourth area D and the sixth area F is manufactured The output power of the laser in the process is 1200W, and the output power of the laser in the manufacturing process of the forming layer 10 of the fifth region E and the seventh region G is 700W. This situation is to simulate the output power of the laser in the production process. case of large changes.

[0049] Based on the relative radiation intensity of the characteristic spectral line FeI384.0nm, a time-domain diagram corresponding to the additive manufacturing process is established, such as Image 6 As shown in (b), it can be seen from the figure that when the state of the graph fluctuates or changes sharply from the relativ...

Embodiment 3

[0051] In this embodiment, the schematic diagram of the additive molding object formed by laser additive manufacturing is as follows Figure 7 As shown in (a), the molding layer 10 is divided into the eighth area H, the ninth area I and the tenth area J, and the scanning speed of the molding layer 10 in the eighth area H and the tenth area J during the manufacturing process is is 5 mm / s, while the scanning speed of the molding layer 10 in the ninth region I is lower than 5 mm / s during the manufacturing process, this situation is the case of simulating a large change in the scanning speed during the production process.

[0052] Based on the relative radiation intensity of the characteristic spectral line FeI384.0nm, a time-domain diagram corresponding to the additive manufacturing process is established, such as Figure 7 As shown in (b), it can be seen from the figure that when the state of the graph fluctuates or changes sharply from the relatively stable state of the eighth ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/63
CPCG01N21/63
Inventor 陈波姚永臻檀财旺宋晓国冯吉才
Owner HARBIN INST OF TECH AT WEIHAI
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