Experimental Research and Optimization of Ti-6Al-4V Alloy Microgroove Machining Based on Waterjet-Guided High-Power Laser

Abstract

In order to improve the tribological properties of Ti-6Al-4V alloy and further broaden the application scope of titanium alloy materials in the industrial field, a preparation method of a waterjet-guided high-power laser processing surface microgroove was studied. In this paper, a multifocus coupling lens was innovatively designed to replace the spherical lens in the traditional waterjet-guided laser coupling device, which avoids the gas explosion phenomenon in the coupling of the high-power laser and waterjet, and realizes the high-quality coupling of the high-power laser and water beam fiber. Then, with the microgroove morphology as the response target, the single-factor test and response surface test of the water-guided laser processing microgroove were carried out. Based on the experimental results, an approximate mathematical model of the response surface between the process parameters and the microgroove topography target was constructed, and the quantitative relationship between the waterjet-guided laser processing parameters and the target response was studied. At the same time, the optimal combination of process parameters was obtained by multiobjective optimization, so as to effectively improve the microgroove morphology. This technology provides method guidance and a decision-making reference for subsequent waterjet-guided laser processing of titanium alloy surface functional microstructures.

Systematic review of optimization techniques for laser beam machining

“…Further, several response characteristics like surface roughness, dross height, kerf width, kerf taper angle, and striation can be optimized. This is accomplished by carefully changing parameters such as the laser power, pulse duration, focus depth, scanning speed, cutting speed and gas pressure [38][39][40][41][42]. This equilibrium is essential for accomplishing the objective of responses and reducing the amount of time and resources.…”

Annular gas-assisted water jet guided laser manufacturing groove structure of Inconel 718 alloy

“…However, we cannot infinitely increase the output power of industrial lasers. Moreover, the heat resistance of the water jet nozzle is limited, and it cannot withstand too much laser power [26]. Therefore, the laser power density transmitted to metal materials is the key to determining the machining capacity of WJGL.…”