High-speed, high-resolution and high-precision ultra-high temperature molten pool temperature field online monitoring device and method

Abstract

The invention discloses a high-speed, high-resolution and high-precision ultra-high temperature molten pool temperature field online monitoring device and method. By using the invention, only one high-speed camera can be used to realize the detection of the melting pool temperature, and the structure is simple and easy to realize. The present invention first adopts the long-wave pass dichroic mirror to only reflect the infrared light signal radiated by the molten pool into the spectroscopic system, which avoids the influence of laser light on imaging; then, in the spectroscopic system, the dichroic mirror and band-pass filter are used Two different bands of infrared light are selected for imaging and temperature calculation, which avoids the influence of the plasma in the printing room on the imaging of the high-speed camera, avoids the loss of light intensity caused by the splitting of the same band of light, and improves the measurement accuracy. The light splitting system of the present invention is simple and compact in structure and small in size, and can realize that the separated light beam 1 and light beam 2 enter the same high-speed camera in the form of parallel light to realize coaxial measurement, and by adjusting the optical path difference, two images can be simultaneously focused and formed .

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of molten pool temperature field, in particular to a high-speed, high-resolution, high-precision, ultra-high-temperature online monitoring device and method for molten pool temperature field, which can be applied to the monitoring of molten pool temperature field in the laser selective melting process of additive manufacturing Online Monitoring. Background technique [0002] Metal 3D printing technology is the most cutting-edge and most potential technology in the current 3D printing system, and it is one of the key development directions in the current advanced manufacturing technology. Metal 3D printing technology is mainly divided into three categories according to the method of adding metal powder: laser selective melting technology, laser near-net shaping technology, and electron beam selective melting technology. Laser selective melting technology is suitable for the manufacture ...

AI Technical Summary

Problems solved by technology

It indirectly indicates whether the temperature of the molten pool is too high or too low according to the radiation intensity of the molten pool. However, this method is a single-point temperature measurement method, which can only measure the average temperature of the molten pool, and cannot measure the specific distribution of molten pool temperature values. , only knowing the average temperature of the molten pool cannot be used for defect monitoring of the molten pool

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