Method for calibration of laser absorptivity of metal material

Abstract

The invention belongs to the field of laser preheating auxiliary processing and particularly relates to a method for calibration of laser absorptivity of a metal material. The method comprises a step S1 of utilizing a thermocouple to measure a temperature value of a test point of a workpiece varying with time under laser radiation; a step S2 of establishing a heat source model of the workpiece, adopting the heat source model to perform a simulated test, and obtaining a temperature value of a corresponding point of the test point varying with time on the heat source model; a step S3 of adjusting a parameter of the laser absorptivity input into the heat source model; and a step S4 of causing simulated test results to undergo a non-linear error analysis with an actual measurement result respectively, wherein a laser absorptivity parameter corresponding to an obtained optimal result is the laser absorptivity of the metal material. According to the method, a high-precision calibration result can be obtained, the process is simple, a test device is easy to obtain, small in calculated amount and is not easily disturbed by external factors, and thus the method is particularly suitable for testing the laser absorptivity of the metal material.

Description

technical field [0001] The invention belongs to the field of laser preheating auxiliary processing, and more specifically relates to a method for calibrating the absorption rate of metal materials to laser light. Background technique [0002] Difficult-to-machine materials such as high-temperature alloys, titanium alloys, and ultra-high-strength steels have been widely used in high-tech industries because of their good high temperature resistance, corrosion resistance, and good fatigue resistance. At present, laser preheating assisted cutting is one of the effective methods to improve the processing performance of difficult-to-machine materials. By increasing the temperature of the local position before the material is cut, the thermal processing performance can be improved, the cutting force can be reduced, and the tool life can be improved. One of the key technologies of laser preheating-assisted cutting lies in the distribution of the temperature field of the processed ma...

AI Technical Summary

Problems solved by technology

[0012] At present, there is no calibration method using temperature measurement and finite element software for laser absorptivity. This field urgently needs to design a new calibration method to solve the above defects and deficiencies.

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