Research On Grinding Technology Of CFRP Composite Antenna Mould

High-band Civil communication satellites require higher precision for antennas,while the thermophysical properties of carbon fiber reinforced resin-based composites(CFRP composites)are naturally consistent with the thermophysical properties of antenna reflector products,at high temperature molding and The thermal deformation during the cooling and shrinking process has little influence on the precision of the product,and is the preferred mold material for the antenna reflector molding.Since the antenna reflector mold has the characteristics of large diameter and aspherical surface,and the CFRP composite material is difficult to process into a curved shape,the conventional surface forming finishing method based on the conventional machine tool is not ideal.In order to solve the above processing difficulties,this paper proposes a constant force time-controlled surface machining method based on flexible grinding and polishing of mechanical arms.The process principle of the processing method was analyzed,the material removal mechanism of the mold and the formation mechanism of the grinding surface were explored,and the path removal model of the mold grinding material was established.Firstly,based on the existing flexible processing technology of mechanical arm,using the advantages of pneumatic grinding disc tool and constant force controlled grinding,an improved constant force for the large diameter and convex surface of CFRP composite antenna mold is proposed.Time control grinding method.The process characteristics were analyzed,and the mechanical arm constant-force timegrinding and polishing platform was designed and built.The theory and algorithm were modeled during the machining process,and the grinding process was simulated to verify the effectiveness of the machining process.Secondly,based on the material properties of CFRP composites,the removal mechanism of materials for grinding and polishing of constant force control was analyzed.The finite element modeling of the reinforcing phase,matrix phase and interface phase of the material was carried out at the micro scale.A single abrasive grain simulation was carried out on the grinding and polishing process,revealing the formation mechanism of the workpiece surface under different material removal rates and the cause of the surface machining defects of the workpiece,and determined the key grinding processing parameters.By improving the traditional planar flexible grinding and polishing material removal model,a material removal model suitable for CFRP composite material surface mold constant force control grinding process was established.Finally,the control experiment was arranged,the complete mold grinding process was carried out,the profile precision of the machined mold was evaluated and analyzed,and the effectiveness of the grinding system and the control precision of the material removal model were examined.