Abstract
In large areas of laser drilling, the residual vibration occurs when the sample stage moves in PTP (Point to Point) movement. It affects the surface quality and processing efficiency of the holes. The common solution for this problem is to set the laser irradiation delay time by the controller to wait for the residual vibration attenuation, but the whole drilling circle will increase. In this paper, a new method is introduced to reduce the laser drilling circle. By setting the allowable threshold of the residual vibration for the subsequent process, the sum of the time in deceleration segment of the trapezoidal moving profile, and the time when the residual vibration attenuates below the amplitude threshold (ST) can be minimized as the optimization goal. The results show that for a given operating speed, there is always an optimum acceleration value for the deceleration segment of the trapezoidal moving profile, which minimizes the ST value. Further, the delay time for laser irradiation can also be estimated according to the optimal acceleration during laser drilling.
Highlights
Laser processing holds the characteristics of noncontact, low pollution, and high efficiency
Laser processing is achieved through cooperative control between these subsystems. e delay problem in the cooperative control process determines the performance of the equipment and affects the processing efficiency
In order to obtain the dynamic parameters of the sample stage, two different move profiles are used to excite the sample stage, and the residual vibration signal after the sample stage stops is obtained by the signal acquisition device. e designed moving profiles are shown in Figure 5, which adopts a triangular motion profile and trapezoidal motion profile, respectively. e experimental setup is illustrated in Figure 6. e data acquisition equipment belongs to the NI company, and the data acquisition software is developed based on the LabVIEW environment
Summary
Laser processing holds the characteristics of noncontact, low pollution, and high efficiency. In the field of laser drilling, many motion controllers still use the simple trapezoidal moving profile to control the motion of the sample stage due to the complexity of motion control algorithms and product cost This type of move profile is simple and easy to be operated, residual vibration will inevitably occur when the sample stage stops, which affects the processing quality and processing efficiency [19,20,21]. Using system identification algorithms such as ARMA, STD (sparse time domain), etc., the model parameters can be obtained through the measurement and analysis of the residual vibration signal. When the autoregressive coefficient φk is obtained, the dynamic parameters of the system can be calculated by the transfer function expression of the ARMA model.
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