Research On The Focus Control System Of Laser Cutting Machine

In the process of laser cutting, the axial position of the gas-mouth is always behind thelaser focus in the direction of cutting, can improve the cutting quality and speed effectively.Based on constantly controlling the position between injection gas axial and laser beamfocus, we propose a kind of electromagnetic driving and permanent magnet restoring lasercutting control system.Based on the analyzing the magnetic conductance of annular permanent magnet,cylindrical permanent magnet and air-gap, we propose a kind of3degrees of freedomsame-stiffness permanent magnetic spring workbench that working for radial direction.According to the structure of the magnetic spring, combined with the workingcharacteristics of the annular permanent magnets and cylindrical permanent magnets, weestablish radial magnetic mathematical model of3degrees of freedom same-stiffnesspermanent magnetic spring.Although electromagnet is a non-linear actuator, using reasonable structure designand differential control, we can get a good linearity in the vicinity of working point. In thispaper, we make a kind of electromagnetic drive and permanent magnet restoring lasercutting micro platform. The X direction, Y direction to move and C direction to rotation iscontrolled by using three groups of differential electromagnet, the resistance of threedirections is getting by3-DOF magnetic spring.In order to determine the effect of parameters of permanent magnet and magneticcoils to mechanical properties, ascertain the air gap distance in a horizontal direction andvertical direction of micro platform. do theoretical analysis, finite element analysis andexperimental study of differential electromagnet in the platform and the permanent magnetspring.According to the mathematical model of permanent magnetic spring andelectromagnet, Lagrange principle, we establish a dynamic model of the laser cuttingplatform controlling system. Put out control voltage signal with connecting seamlesslySimulink and Controdesk. Study response, positioning control and angle controlexperimental characteristics.