Simulation And Experimental Verification Of Spiroid Face Gear Skiving

Spiroid face gear transmission is a form of space non-parallel shaft gear transmission,which is composed of a cylindrical gear and a spiroid face gear.Compared with the bevel gear transmission,the spiroid face gear transmission has a larger coincidence degree,more sufficient tooth surface contact,and is also more stable and less noisy.It has a wide range of applications in robot joints,vehicle rear axle reducers,and helicopter reducers,etc.The existing face gear mechanical generation processing methods are mainly suitable for spur face gears and small helix angle face gears,but cannot be used to process face gear tooth surfaces with large helix angles.Therefore,in view of the limitations of the generation processing method of large helical angle gears,this paper proposes and studies the technology of machining helical gears by skiving.Main contents are as follows:According to the gear shaping process principle of the spiroid face gear,the tooth surface equation of the helical tooth surface gear is constructed.According to the kinematic relationship of the gear shaping process of the face gear,the coordinate system of the gear shaping machined face gear is established.From the tooth surface equation of involute cylindrical gear,according to the meshing relationship between the involute cylindrical gear and the spiroid face gear,the theoretical tooth surface equation of the face gear is deduced.The numerical calculation method is used to obtain the discrete point coordinates of the tooth surface of the spiroid face gear,and then the 3D digital model of the spiroid face gear is obtained by using the 3D software.According to the meshing principle of space gears,a method of machining large helix angle face gears with small helix angle helical tool cutting is proposed.Constructed the theoretical machining model of the helical tooth surface gear with two degrees of freedom generated by the skiving method,and obtained the spatial position layout of the tool and the workpiece,establishment of mathematical model of edge curve of bowl-shaped gear skiving.According to the machining motion analysis of the skiving method,based on the double-degree-of-freedom envelope principle of the space surface and the kinematic relationship of the skiving process,the tooth surface equation of the spiroid face gear machined by the skiving method is derived.According to the obtained discrete point coordinates of the tooth surface,the tooth surface error analysis model is established,and the tooth surface error analysis and comparison of the obtained spiroid face gear tooth surface and the theoretical tooth surface are carried out.Constructed the machining motion model of CNC machining of spiroid face gear by skiving method,and carried out CNC machining simulation of spiroid face gear.According to the structural characteristics of CNC machine tools processed by the spiroid face gear skiving method,a three-dimensional model of the gear skiving machine tool is established.According to the transformation relationship between the theoretical model of face gear skiving and the numerical control machining model,the movement of gear skiving NC machining is analyzed,determined the movement parameters of each axis in NC machining by skiving method.Designed the bowlshaped skiving cutter structure,studied the practice method of the cutter blade curve,and established the three-dimensional model of the cutter.Using the VERICUT numerical control machining simulation software,import the machine tool and cutting tool model,write the numerical control machining program based on the motion parameters of each axis of the numerical control machine tool obtained above,carry out the machining simulation of spiroid face gear by skiving method,and analyze and compare the simulation results,and analyze and compare the simulation results,and further studied the general rules of NC programming for machining spiroid face gears by NC skiving.According to the machining principle of the above-mentioned spiroid face gear by skiving method,and considering factors such as processing equipment,the test of gear machining surface by skiving method was carried out.According to the general method obtained in the simulation process of spiroid face gear skiving,the simulation processing and analysis of spur tooth surface gear machining by the skiving method are carried out and compared.According to the actual processing equipment parameters,the face gear cutting test scheme is designed,and the gear cutting method is used to process the straight tooth face gear by using the gear cutting machine tool of Luoyang Keda Yuege CNC machine tool,and the tooth surface of the spur gear after the processing is completed.The test results show that the error of the left tooth surface is 74.4μm,and the error of the right tooth surface is 60.7μm,the correctness and feasibility of machining face gears by the skiving method can be further verified through experiments.