Study On Femtosecond Laser Ablation Energy Model And Tooth Surface Finishing Technology Of Face Gear

Face gear is a key part to realize space intersecting or interlocking transmission.It has the advantages of strong bearing capacity,high convergence,smooth transmission,good interchangeability,low noise and so on.It is widely used in aerospace,large mechanical equipment,heavy machinery equipment and other high-end fields.The tooth shape of face gear is complex,the technical requirements are high,and the manufacturing is difficult.Generally,tooth grinding is used as a precision machining method.The grinding accuracy of the external gear is about 2 levels higher than that of the domestic gear.In order to solve these technical bottlenecks,this paper uses femtosecond laser fine finishing technology to remove the remaining machining allowance of the tooth surface,and adopts the method of combining theoretical analysis,simulation and experimental research to carry out research on the ablation energy model and process of the femtosecond laser fine trimming gear,which mainly includes the following contents:Study on ablation process of gear tooth surface with femtosecond laser finishing.Femtosecond laser is studied and the effect of face gear material process,analyzes the femtosecond laser purify tooth material surface of the general law of action,and analyzes the femtosecond laser ablation surface complex dynamic effects in the process of gear material,femtosecond laser are studied theoretically remove complex phenomenon in the process of face gear material,reveals the essence of femtosecond laser shaving gear tooth surface complex physical processes.Numerical simulation of gear tooth surface with femtosecond laser finishing.Based on the phenomenon of non-fourier heat transfer and the double temperature equation,the thermal model of femtosecond laser ablation was established considering the intertemperature induction between the components of gear materials.Based on the non-fourier heat transfer phenomenon and the three temperature equation,a three-temperature heat transfer model for femtosecond laser finishing gear was established considering the cumulative effect of pulse energy.Finite element analysis software was used to simulate the temperature field variation and the ablation depth and radius of the tooth surface when the femtosecond laser acted on the tooth surface of the gear,and the laser parameters needed to remove the material of the gear surface were obtained.Experimental study on fine tooth surface of gear with femtosecond laser.An experimental study was carried out to remove the residual machining allowance of the tooth surface with femtosecond laser,and a machining system for the fine trimming gear tooth surface with femtosecond laser was built.Combined with the numerical simulation,the surface quality of the tooth surface was studied when the surface gear material melted and gasified.The effects of laser parameters,such as laser energy intensity,pulse number,scanning speed and scanning spacing,on the morphology,radius,depth,removal efficiency and roughness of tooth surface ablation were analyzed.The application range of femtosecond laser finishing gear was analyzed.Study on Tooth Surface Finishing Technology of Femtosecond Laser Finishing Gear.The influence relationship between the error surface and the theoretical surface of the face gear was explored,and the difference surface of the face gear was established to reduce the error of the remaining machining allowance in the finishing process of the face gear.The finishing track of the opposite gear is processed in layers and regions,and the specific steps of the process of femtosecond laser finishing trimming are described,which provides a high precision machining method for the femtosecond laser finishing trimming gear.