Short pulsed laser machining: How short is short enough?

Approximate, quasi-one-dimensional conduction models have been developed to predict the changing shape of holes, single grooves, or overlapping grooves carved by ablation into a thick solid that is irradiated by a moving laser source. For CW or pulsed laser operation a simple integral method is presented, which predicts shapes and removal rates with an accuracy of a few percent, while requiring one order of magnitude less CPU time than a three-dimensional, numerical solution. For pulsed operation a “full-pulse” model is presented, computing the erosion from an entire pulse in a single step, and reducing computer time by another order of magnitude.

Download Full-text

On the micro-modelling of surface roughness in pulsed laser machining

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1037/1/012007 ◽

2021 ◽

Vol 1037 (1) ◽

pp. 012007

Author(s):

E Kaselouris ◽

Y Orphanos ◽

K Kosma ◽

A Skoulakis ◽

I Fitilis ◽

...

Keyword(s):

Surface Roughness ◽

Pulsed Laser ◽

Laser Machining

Download Full-text

Study on Ultrasonic-Assisted Laser Machining of Si3N4

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.693.914 ◽

2016 ◽

Vol 693 ◽

pp. 914-921 ◽

Cited By ~ 1

Author(s):

Yan Sheng Yao ◽

Yuan Yuan Wang ◽

Xiu Yu Li ◽

Xue Hui Chen ◽

Gen Fu Yuan ◽

...

Keyword(s):

Water Flow ◽

Flow System ◽

Pulsed Laser ◽

Laser Machining ◽

Width Ratio ◽

Measuring Instrument ◽

Two Dimensional Image ◽

Machining Quality ◽

Ultrasonic Assisted ◽

Microstructure Morphology

Si3N4 is difficult to be machined due to its hard and brittle nature. In order to improve its machining quality, a new method of ultrasonic-assisted laser machining is proposed. The machining device is established including Nd: YAG pulsed laser, ultrasonic vibration stage and water flow system. Etching experiments of laser machining with and without sample vibration in anhydrous conditions and in water conditions are studied respectively. A VM-3030E two-dimensional image measuring instrument is applied to detect shape and measure dimension of the sample. Microstructure morphology of the sample is observed by a JSM-7500F scanning electron microscope. Experimental results show that there are fewer slags on inner surfaces of V-shaped grooves when laser machining with water flow. The surface quality and depth-to-width ratio of grooves machined by laser with vibration on sample are improved significantly in comparison with those without vibration. The depth-to-width ratio of groove machined by laser with 90.1W vibration power is near twice than that without vibration.

Download Full-text