| The spiroid face gear drive is a spatial transmission mechanism composes of a involute spiroid pinion and a spiroid face gear,which belongs to skew-axes gear drive.It can be found that more and more applications in different engineering branches due to its advantages of large contact ratio,compact structure,high gear ratio,low noise,simple and mature manufacturing process of the spiroid pinion,strong bearing capacity and steady transmission.The spiroid face gear studied in this paper is a core component applied in fishing reel manufactured roughly by die-casting,due to the machining accuracy and thermal deformation of the die,the spiroid face gear manufactured by die-casting has poor surface quality.A method of shaving processing for this type of spiroid face gears is proposed,and the main research content in this paper includes the following aspects:The tooth surface equation of the imaginary pinion cutter is deduced.According to the differential geometry and the gear meshing principle,the coordinate systems applied for generatiorn of the spiroid face gear are established.Through the coordinate transformation,the tooth surface equation of spiroid face gear generation by an imaginary pinion cutter is derived.According to the conditions of not undercutting and not pointing,the minimum inner radius and the maximum outer radius of the spiroid face gear are obtained.According to spiroid face gear and involute spiroid pinion tooth surfaces,the discrete points data on the tooth surfaces are solved by numerical calculation method,import the points discrete data into the three dimensional(3D)CAD software,establish the accurate 3D geometric model of the spiroid face gear and involute spiroid pinion.According to the meshing theory of spatial crossed axes gears,a method of shaving processing for spiroid face gear is presented.The principle of the spiroid face gear shaving processing is investigated,and the kinematics model of shaving processing is established.The tooth surface equation of shaving cutter is obtained based on the involute spiroid pinion tooth surface equation.The coordinate systems of shaving processing for spiroid face gear are established,solve the relative velocity at the cutting point of shaving processing,and deduce the meshing equation and tooth surface equation of spiroid face gear generation by shaving processing.The shaving cutter is designed by slotting in the tooth surface of the involute spiroid pinion,the slotting method of the shaving cutter groove is investigated,and designed the structure of the shaving cutter groove,then manufactures the shaving cutter in the actual process.According to the principle of spiroid face gear shaving processing,the machining simulation of spiroid face gear is carried out by using VERICUT software.The complete machining simulation flow of spiroid face gear shaving processing is designed,the solid model of the shaving machine,the shaving cutter and the gear blank are established by using 3D CAD software,and then import them into the VERICUT software.According to the motion relationship of shaving processing for spiroid face gear,the cutting point path required for shaving machining simulation are calculated,and the corresponding numerical control codes are programmed,then obtained the geometry model of spiroid face gear by machining simulation.Compared with the theoretical model,the working tooth surface deviation of simulation model is no more than 9.8?m.Based on the designed and manufactured grooved shaving cutter,the shaving experiments of spiroid face gear are performed on the CNC machine tool.The tooth surface roughness of the spiroid face gear manufactured roughly by die-casting and after shaving processing are measured by using Infinite Focus optical 3D measuring instrument,and the experimental results illustrate that the tooth surface roughness of the spiroid face gear concave flank after shaving is reduced to 0.6311?m,which verified that the shaving processing for the spiroid face gear developed in the paper is correct and feasible. |
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