LabView-based real-time monitoring system for laser cladding/laser re-melting process temperature field

Abstract

The invention discloses a LabView-based real-time monitoring system for a laser cladding / laser re-melting process temperature field, which comprises a software control part and a temperature measuring device, wherein the software control part is composed of a LabView program and a single chip program; the temperature measuring device is composed of an infrared temperature measuring sensor, a single chip, a single chip power supply module, a sensor power supply module, a 22.1184MHz crystal oscillator, a resetting circuit and a laser processing machine tool; the system can be used for realizing the functions of real-time collecting and dynamic monitoring for the temperature data in the laser processing processes of laser re-melting, laser cladding and laser welding, high-temperature alarming, temperature data storage and output, setting for different temperature curve display modes, temperature curve picture output, setting for different temperature precisions, dynamic display of temperature curves, data playback, check and editing, and the like; and the sensors with different temperature measuring scopes are selected according to the temperature measuring demand, so that the temperature measurement within the scope of 0-2500 DEG C is realized.

Description

technical field [0001] The invention relates to the field of temperature field measurement in a laser processing process, in particular to a LabView-based real-time monitoring system for a temperature field in a laser cladding / laser remelting process. Background technique [0002] A common feature of laser processing processes such as laser cladding, laser remelting, and laser welding is that they interact with metal materials to form high-temperature molten pools under the action of high-energy beam lasers. However, the unique rapid cooling and rapid heating characteristics of laser processing and the unbalanced and unstable characteristics of input energy will inevitably lead to significant changes in the temperature field, affecting the stability of the metal molten pool, resulting in large temperature gradients and thermal stresses, which in turn cause formed parts or coatings. Layer warping, cracking and other defects. In addition, the evolution of the temperature fiel...

AI Technical Summary

Problems solved by technology

However, commercial infrared temperature measuring guns or infrared thermal imagers have a small temperature measurement range, generally below 1200°C. If high temperature measurement is required, special customization is required and the price is relatively expensive.

The key is that commercial portable infrared temperature measuring guns cannot measure the entire processing process in real time, they can only collect the temperature at a certain moment, and cannot obtain the evolution law of the temperature field during the processing process

Although the infrared thermal imager can record the video of the entire processing process and obtain the temperature field of the processing process, it needs to design a special fixture according to its shape and structure, and it is generally not easy to install on the spindle of the processing machine tool due to its large size.

[0006] The principle of temperature field measurement based on high-speed CCD is to take the thermal radiation image of the molten pool during laser processing through high-speed CCD, and then use image processing technology to calibrate and compare the temperature field distribution on the surface of the object, which is the temperature field of high-temperature objects. A new development trend of detection, but limited by black body radiation source equipment, its temperature calibration range is also limited, especially in high temperature area calibration; and it is more cumbersome in image data acquisition, image processing, program design and development, etc. Overall, still in laboratory stage

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