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Molten pool temperature detection system and method for selective laser melting 3D printer

A 3D printer and laser melting technology, applied in the direction of spectrometry/spectrophotometry/monochromator, thermometers with physical/chemical changes, thermometers, etc.

Inactive Publication Date: 2020-07-07
SOUTHEAST UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is no technical solution to improve the quality of selective laser melting 3D printing by detecting the characteristic spectrum of the molten metal pool in the molten state. This invention proposes

Method used

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  • Molten pool temperature detection system and method for selective laser melting 3D printer
  • Molten pool temperature detection system and method for selective laser melting 3D printer
  • Molten pool temperature detection system and method for selective laser melting 3D printer

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] The detection of the melt pool temperature in the present invention is realized by locking the characteristic spectrum of the workpiece material to be processed. The principle is: when the metal material powder under high-energy laser irradiation absorbs energy from the incident laser and the temperature continues to rise, the ground state electrons of the metal atoms receive light. Energy and thermal energy are excited to jump to the high-energy orbit of the outer layer of the atom, but this excited state electron (also called Joule electron) is unstable, and after about 10 -8 [s] will return to the inner orbit with a lower energy level in the future, and finally return to the ground state to reach a new stable state. Accompanied by a series of energy level transitions of Joule electrons, metal materials release characteristic spectra of specific wave...

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Abstract

The invention discloses a molten pool temperature detection system and method for a selective laser melting 3D printer. Under the situation that an original equipment structure and an original opticalpath system of the SLM 3D printer are not changed, photoelectric information of a molten pool in the machining process is obtained only by additionally arranging a narrow-band optical filter, a photoelectric detection circuit and a data acquisition and processing system module at an interface of a coaxial spectroscope, and real-time closed-loop control over the temperature of the molten pool is achieved through acquisition, operation and processing of the information. According to the molten pool temperature detection system and method, higher printing quality and efficiency are obtained, theapplication range of the SLM 3D printing technology is further widened, the detection speed is high, the control effect is good, the compatibility with original equipment is high, and the cost performance of application implementation is high.

Description

technical field [0001] The invention belongs to the field of molten pool temperature detection and control, and in particular relates to a molten pool temperature detection system and method for a selective laser melting 3D printer. Background technique [0002] Selective Laser Melting (SLM) is a technology that uses metal powder to be completely melted under the heat of a laser beam, cooled and solidified to form a shape. As a kind of 3D printing technology, SLM technology can directly make terminal metal products according to the 3D model, which is suitable for workpieces of various complex shapes, and has good mechanical properties comparable to traditional processes. [0003] However, since SLM3D printing technology belongs to the category of additive manufacturing technology, the overall molding of the workpiece in the manufacturing process is completed by laying metal material powder layer by layer and laser scanning and melting layer by layer. The microstructure prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105G01J3/42G01K11/20B33Y50/02B33Y30/00
CPCG01K11/20G01J3/42B33Y50/02B33Y30/00G01J2003/423B22F10/00B22F12/44B22F10/368B22F12/49B22F10/85B22F12/90B22F10/36B22F10/28Y02P10/25
Inventor 刘京南陈从颜李宇袁景光
Owner SOUTHEAST UNIV
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