The Optimization Of Both The Tool Profile And The Machining Settings For The Skiving Of Spur Face Gears

At present,face gear transmission technology has been widely used in the industry.As a result,the technology of face gear design and manufacture has also become a current research hotspot,including the face gear skiving technology studied in this paper.As an efficient machining method,Skiving has been maturely applied to cylindrical gears.Taking into account the paired meshing relationship between cylindrical gears and face gears,face gear skiving has also entered the field of view of many researchers.Skiving machining is a high-speed generating machining method with two degrees of freedom envelope of curved edge.During machining,there is an angle between the tool axis and the tooth width direction of the machined gear to ensure the cutting performance.However,this angle will lead to a certain principle machining error.For cylindrical gears with constant pitch pressure angle and tooth pitch in the direction of tooth width,the effect of the angle on the principle error is consistent in different tooth widths.At this time,the cutting edge shape can be redesigned to compensate the machining error to obtain the skiving surface with high machining accuracy.The pitch pressure angle and pitch of the face gear change with the tooth width,which makes it difficult to compensate the principle error of the machined face gear surface with a fixed curved edge participating in the skiving motion,thus affecting the machining accuracy of the face gear turning gear.In order to reduce the principle error of face gear skiving and improve the contact performance of machined tooth surface,the following work is done from the perspective of adjusting the cutting edge shape of tool and machining parameters.(1)According to the kinematic relationship of spur face gear skiving,the equations of face gear point and its normal vector of power skiving are deduced.The acquisition model of machining error of face gear is established,and then the influence law of tool edge shape and processing parameters on machining error is analyzed.It provides a theoretical basis for the digital analysis of surface of face gear skiving.(2)An optimization model of cutting edge shape and processing parameters is established to reduce the error of machined surface.In this model,the machining error is the objective function,and the cutting edge parameters and processing parameters are the optimization objects.Combined with the problems of incomplete cutting area,sharp tooth tip and fish scale on the tooth surface,the relevant constraints are given to avoid these situations;Finally,an example of tool design is given,and the correctness of the theory is verified by simulation experiments.(3)The effects of cutting edge shape and machining parameters on the tooth surface contact area are analyzed.The optimization model of cutting edge shape and machining parameters aiming at avoiding edge contact is established.And solve it.The results show that the tooth surface with optimized cutting edge shape and machining parameters can effectively avoid edge contact.(4)Taking the tool profile and processing parameters design method of minimizing machining error as an example,the skiving experiment for face gear is carried out.The machining results show that the tooth profile and pitch of the surface of face gear skiving are 6-level accuracy,which verifies that the tool and processing parameters design method proposed in this paper is feasible.