Metal powder laser forming process temperature field detection method and its systematic device

Abstract

The invention relates to a metal powder laser rapid prototyping technology, in particular to a temperature field detecting method and the system device in the working process of the rapid prototyping of the metal powder. The invention adopts dual wavelength infrared image colorimetric temperature measuring method, the optical filters in two wavelengths are alternately arranged in the gathering optical path at different times, the image in the fused bath from two different wavelength are continuously and orderly gathered, and the color matching calculation of the gradation of the two infrared image from different wavelength are performed, according to the relationship between the color matching value and the temperature value, the temperature value of each point of the image is acquired, the temperature value is represented by the tonal value and a gradation image is formed, the gradation image then is processed, and the shape and temperature changing trend is acquired. By adopting the invention, the temperature distribution and the changing trend of the temperature field of the fused bath can be detected in real time during the rapid prototyping process of the metal powder, and then the temperature of the work piece process parameter can be adjusted in real time.

Description

technical field [0001] The invention relates to metal powder laser rapid prototyping technology and non-contact temperature measurement technology of temperature field, specifically a temperature field detection method and system device in metal powder laser rapid prototyping process. Background technique [0002] Metal powder laser forming technology, which appeared in the late 1990s, is a new processing and manufacturing technology based on rapid prototyping technology. Its unique processing characteristics of metal parts have attracted widespread attention and research from scientific research institutes in recent years. and applications. Metal powder laser forming is a processing process affected by many factors, such as changes in processing parameters, unstable environmental conditions, etc. will affect the quality of the formed parts, and the accumulation of errors in the continuous processing process often leads to the quality of the formed parts or The accuracy can...

AI Technical Summary

Problems solved by technology

At present, non-contact infrared temperature measurement is a research hotspot in rapid prototyping. Some research departments have used infrared detectors to measure temperature, but the instrument is greatly disturbed by the processing environment and the cost is high.

The infrared image colorimetry method based on dual wavelengths has been used to detect the temperature field in the fields of welding and metallurgy, but its application in the rapid prototyping process has not been reported. Due to factors such as narrow range and harsh processing environment conditions, the application of dual-wavelength infrared image colorimetric temperature measurement method in the process of laser rapid prototyping is a new temperature detection technology.

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