Abstract
As the microporous structure has been widely used in the field of precision machining, at the same time, the requirements for the quality of microporous machining are continuously increasing. Water jet-guide laser processing technology (WJGL) has been gradually applied for its high machining precision. However, there are a few researches on the heat conduction process of WJGL processing metal materials. Therefore, it is of great significance to study the transient thermal effect of metal materials and the mechanism of material removal to improve the processing quality. In order to explore the heat conduction model of WJGL processing metal materials, this paper is based on the “element birth and death” technique in the finite element method, and the three-dimensional transient temperature field of four typical metal materials (titanium alloy, stainless steel, aluminum alloy, copper) and material removal model are established. Under this model, the removal mechanism of different metal materials and the influence of different process parameters on the temperature field distribution of the material are studied, and the influence of fixed-position drilling and helix drilling on the microporous morphology is compared. The results show that copper and aluminum alloys can obtain a larger depth-to-diameter ratio and a smaller hole taper. Titanium alloy and stainless steel have better hole roundness, lower hole edge temperature, and smaller thermal deformation. Hole roundness error and hole taper decrease with the increase of laser power. The roundness error of each material is reduced to within 10 μm when the laser power is 10 W, and the average hole taper is 8.73°.
Highlights
With the advancement of science and technology, microporous structures have broad applications in aerospace, high-sensitivity optical fiber sensors, consumer electronics, threedimensional integrated circuit packaging and other fields
It can be seen from the figure that the temperature of titanium alloy and stainless steel rise rapidly in the initial stage of laser action, and the material removal temperature can be reached rapidly
In order to further study the technological characteristics of water jet-guided laser processing of microporous, combined with the finite element simulation, the four kinds of metal materials in the different laser power, different scanning speed, and different drilling paths were studied
Summary
With the advancement of science and technology, microporous structures have broad applications in aerospace, high-sensitivity optical fiber sensors, consumer electronics, threedimensional integrated circuit packaging and other fields. Compared with the traditional laser processing technology, the water jet-guided laser processing technology has significant advantages and is gradually applied in the high-precision microporous processing. In recent years, this technology has attracted more and more attention and research from researchers. It is of great significance to study the transient thermal effect of water jet-guided laser processing of metal materials and the mechanism of material removal to improve the processing quality and reduce the range of process parameters. Adjusting the laser power can reduce the taper of the microporous, and the effect of water jet on the material cooling by strong convection is remarkable, which plays an important role in ensuring the roundness of the hole
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