Feasibility study of laser and in-situ ECM of array holes

Abstract

Aiming at the issues of low machining efficiency and difficulty in keeping consistency of machining accuracy of micro array holes with high surface quality. This paper proposed a laser and in-situ electrolytic machining technology for processing array holes, which utilized the advantages of high laser machining efficiency and good surface quality electrochemical machining (ECM). Firstly, laser was used to perform high-efficiency drilling of prefabricated micro array holes on workpieces that was covered with insulating layer, and then the recast layer and taper of prefabricated holes were removed by ECM. To verify the feasibility of the proposed method, laser prefabricated of the array holes with the diameter of 0.8 mm and the in-situ electrolytic recast layer removal were carried out on the Inconel 718 workpiece. Influences of laser scanning speed, defocusing distance, scanning times and insulating plate thickness on the taper of prefabricated hole were investigated experimentally. The optimized laser processing parameters were as follows: scanning speed 60 mm/s, defocusing distance 1.5 mm, scanning times 50, and insulating plate thickness 0.4mm. Results of in-situ ECM showed that the recast layer on the surface of the laser processed holes could be removed, indicating that the laser and in-situ ECM could achieve high efficiency and high precision machining of micro array holes without recast layer.

Research on tool monitoring system for micro-pilot hole drilling of spinneret

“…The main interface of the tool monitoring system for micro guide hole drilling of spinneret is used to display the magnitude of the bit torque, the magnitude of the bit axial force, the magnitude of the filtered axial force and torque, the magnitude and phase of the axial force, the magnitude and phase of the torque, and the degree of tool wear in real time. The on-line curve drawing function of labview2012 is used to dynamically display the real-time state of the bit stress and fracture, including the torque, axial force, amplitude and phase of the bit during the processing of the pilot hole, and to display the real-time curve and axial force curve of the tool torque [8]. The drawn waveform and square diagram visually display the changes of the data.…”

Research on high performance free-running mode InGaAs/InP NFAD readout circuit

“…Single photon detection system is a device that can detect extremely weak light. It is widely used in quantum communication [1] , single photon counting imaging [2] , laser ranging [3] , high resolution depth imaging [4] , astronomical observation, national defense and military fields. When performing weak light detection, considering the influence of cost, volume and other factors, Avalanche Photodiode (APD) is generally used as a single photon detector, that is, Geiger mode APD or SPAD.…”

Research on the Application of Industrial Robot Surface Grinding and Polishing Technology in Lithium Battery Cooling Shell

“…For example, the rapid cutting path generation system based on machine vision has been studied and designed [6]. Use the image acquisition device to obtain the processing field of view, edit the processing field of view through the image editor, and the system automatically generates the processing program [7]. The processing parameters can be reused, and the processing path can be dynamically simulated.…”