In the process of gear hobbing machine machining, whether it is machine tool, fixture or meshing motion, there are errors, including machine tool geometric error, motion error, machine tool servo control error, thermal deformation error, workpiece installation error, etc. these errors will lead to the position change between the hob of gear hobbing machine and the workpiece to be machined, resulting in position error, Including 12 installation errors and motion errors in the 6-DOF direction of the workpiece and 12 installation errors and motion errors in the 6-DOF direction of the hob; These errors will affect the position relationship between hob and workpiece, and then affect the accuracy of gear machining.
The systematic error of gear hobbing machining is studied. The theoretical model of gear hobbing is established, and the mapping relationship between the 12 errors of hob and workpiece and the machining accuracy of gear hobbing is studied.
The mapping relationship between gear hobbing machining system error and gear machining accuracy is studied. According to the actual situation of gear hobbing machining, the model of 24 position errors in gear hobbing machining is established from the aspects of installation error and motion error between tool and workpiece. The influence of each position error on gear machining accuracy is theoretically deduced, and the mapping relationship between 12 errors of hob and workpiece and gear hobbing machining accuracy is found.