Abstract
Liquid Assisted Laser Beam Micromachining (LA-LBMM) process is an advanced machining process that can overcome the limitations of traditional laser beam machining processes. This research involves the use of a Molecular Dynamics (MD) simulation technique to investigate the complex and dynamic mechanisms involved in the LA-LBMM process both in static and dynamic mode. The results of the MD simulation are compared with those of Laser Beam Micromachining (LBMM) performed in air. The study revealed that machining during LA-LBMM process showed higher removal compared with LBMM process. The LA-LBMM process in dynamic mode showed lesser material removal compared with the static mode as the flowing water carrying the heat away from the machining zone. Investigation of the material removal mechanism revealed the presence of a thermal blanket and a bubble formation in the LA-LBMM process, aiding in higher material removal. The findings of this study provide further insights to strengthen the knowledge base of laser beam micromachining technology.
Highlights
The Laser Beam Micromachining (LBMM) process is a non-traditional technique that is capable of machining a wide range of materials with ultraprecision in a short period [1]
The process known as Liquid-Assisted Laser Beam Micromachining (LA-LBMM) is capable of micromachining materials with features ranging from 100 to 500 μm with reduced thermal damage, with relatively narrow kerf width, and a reduced re-deposition of debris [10,11]
It is critical to understand the role of liquid medium and the material removal mechanisms involved in the LA-LBMM process to make this process commercially relevant
Summary
The Laser Beam Micromachining (LBMM) process is a non-traditional technique that is capable of machining a wide range of materials with ultraprecision in a short period [1]. The LBMM process offers several advantages including high resolution, minimum wastage, ease-of-control, repeatability and reproducibility [1] This process finds application in several fields from micromechanics to microfluidics [2,3]. The process known as Liquid-Assisted Laser Beam Micromachining (LA-LBMM) is capable of micromachining materials with features ranging from 100 to 500 μm with reduced thermal damage, with relatively narrow kerf width, and a reduced re-deposition of debris [10,11]. The flowing water helps to flush the debris away subsequent laser energy [13]. The flowing water helps to flush the debris away from zone, preventing re-casting and and re-deposition, resulting in a smooth surface surface [13,15].
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