Research On Laser Shock Process Control System

Laser chock process (LSP) is a new technology to strengthen the metal surface using laser-induced shock waves. LSP is commented as the nation's one of most important advanced technology by the United states R&D magazine. This paper analyzes mechanism of laser shock technique, systematically discussed the physical process of laser shock and how laser shock wave generated and its mechanical effect have been introduced. In addition, the influencing factors including coatings, transparent layers, laser parameters, sheet metal parameters and boundary conditions have been discussed.According to requirements of laser shock process experiment platform, the characteristics of the platform control system have been analyzed. PC + motion control card is assumed as the control system, on which research and developments are made. The system consists of four parts, including the host control system, laser modules, four coordinate and auxiliary function modules. In this paper we used the GT-400-SV motion control card of Googol Technology LTD, deeply study the card's library functions. Using the object-oriented interface for designing the preparation of the CNC and the procedures related functions. Principles of high power pulsed laser have been studied and the laser control module is controlled by the card's general out-port. Parameters of four-axis worktable, servo system and interface connections between CNC and servo units have been given. Auxiliary function modules responses the input and output signal of the machine. All related procedures are given in the paper.In the development of the entire platform and experimental verification of CNC system, it is difficult to decide the parameters and hard to predict the laser shock effects. Therefore using neural networks a powerful nonlinear mapping ability to establish a surface residual stress of metallic materials of the optimal control model. In this model, taking the metal of the mechanical properties of material parameters and laser parameters as the network input, the residual metal surface as the network output. Finally, the results show that experimental platform and control system meets the requirements, and the model is useful for laser shock process.