Effect Of Laser Processing Technology On The Surface Quality Of Functional Structure

Frequency Selective Surface(Frequency Selective Surface,referred to as FSS),as a representative of the functional structure,is a periodic frequency selection structure with spatial filtering characteristics.In view of its unique electromagnetic characteristics,FSS is widely used in the stealth field,showing a filtering effect in complex electromagnetic fields.In particular,there are still many problems in processing cell patterns on inextensible frequency-selective surfaces.In this paper,the square ring unit and the Y-shaped unit are taken as the research objects.And the laser division processing method is used to complete the processing experiment.At the same time,the quality of the surface of the workpiece and the processing unit graphics is analyzed.The effect of laser processing technology on the surface quality of functional structures is studied.First,in order to realize the overall double-sided processing of the curved cover plate,the sample was firstly measured with the aid of a coordinate measuring instrument.And then the Creo4.0 software was used to model and take points.And then the preliminary marking pattern was obtained in the Matlab software using the modified point projection algorithm.And it was carried out according to the zoning principle.The area is divided,and then the preliminary marking image is converted into the marking image recognized by the marking software through Coreldraw software to complete the laser processing.Second,laser processing test was carried out on the sample of aluminum coating.And the influence of delay parameters,contour related parameters and filling related parameters on the processing quality of the unit graphics was discussed.Finally,a combination of processing parameters with better processing quality can be found.In order to characterize the processing quality of the unit graphics,this paper uses the material removal rate or root mean square difference combined with the processing shape of the unit graphics to characterize the processing effect of the unit graphics.Third,in order to study the laser processing on the same sample of four different surface materials of aluminum coating,silver coating,chrome-nickel alloy coating,and silver paste coating,high-quality cell graphics were obtained,using the tool microscope to measure the corresponding unit graphic size and record the processing morphology of the final part.Different materials use different processing power,analyze and compare the processing difficulty and processing quality of each material.In view of the small size of the sample in this test,it is impossible to evaluate its quality through electromagnetic testing.So simulation is chosen to display its electromagnetic characteristics.Then the molding process errors are summarized,such as the thickness error of the intermediate dielectric layer,the distortion error of the graphics distortion of the processing unit,and the misalignment error of the graphics of the dual-screen unit.Finally,the paper focus on the efficient processing of cell graphics on silver paste-coated samples.The effects of two processing parameters,processing times and processing power,on the processing quality of the unit graphics are discussed respectively.And the optimal processing times and processing power that can improve the processing efficiency are finally found.Then,the processed parts are subjected to muffle furnace reduction treatment,the processing defects are analyzed,and the electromagnetic simulation of dimensional distortion is carried out,which provided important references and guidance for the efficient processing of inextensible surfaces.