Developing an algorithm for predicting depth as well as number of passes during CO2 laser machining on thermoplastic material

Abstract

Polymethylmethacrylate has an advantage of absorbing the maximum intensity of the radiation incident on it. This makes it suitable to be machined by a laser machining process for creating spherical and rectangular cavities. The most important parameter for achieving the required depth of the cavity is the number of passes of the laser probe along with laser power and scanning speed. This paper deals with the development of an algorithm for predicting the depth of cut for a given number of passes. Further, an attempt is made to develop an algorithm to predict a number of the laser beam passes for a required depth of cut. Both the proposed algorithms show good convergence with the experimental results. The major concern in both the proposed algorithms is the focused distance and depth of cut, which go on changing nonlinearly with an increase in the number of passes.

Theoretical and experimental investigations for geometrical error during hemispherical cavity machining on CO2 laser

“…The plume height, h can be estimated by noting that more vapor will be generated as the laser intensity and laser-material interaction time increases, and more vapor will be removed from the interaction zone as the pressure of the cutting gas jet increases. The estimation of the plume height h can be given by the following expression 37 :…”

“…To achieve the corresponding value of Z during an experiment, laser power, cutting speed, and a number of passes were set based on an algorithm. 37 For any radius of cavity R and corresponding depicted value of Z, the step diameter can be depicted with the help of an algorithm as shown in Figure 3. After machining the first step for a constant cusp height and constant co-efficient of cusp height, the algorithm will compare the step depth obtained with the required radius of the cavity.…”

“…To achieve the corresponding value of Z during an experiment, laser power, cutting speed, and a number of passes were set based on an algorithm. 37 For any radius of cavity R and corresponding depicted value of Z, the step diameter can be depicted with the help of an algorithm as shown in Figure 3.…”

“…A set of depth, as well as kerf taper data, are generated by varying the process parameters like power, speed, and several passes. 37 The power and speed are varied from 10% to 100% and the number of passes is in the range of 1–10. The 3D cavity generation is attempted in two categories.…”

Statistical Investigation of the Effect of CO2 Laser Cutting Parameters on Kerf Width and Heat Affected Zone in Thermoplastic Materials

“…The findings recommended to select short pulses, low laser intensity, high speed, and pressure to minimize the HAZ (El-Hofy and El-Hofy, 2019). Algorithms were developed to estimate the count of laser scanning steps in laser cutting process on PMMA materials to obtain a certain kerf depth (Varsi and Shaikh, 2018).…”