Composite grinding machine tool for internal threads and external bearing channels of steering nuts of automobiles

The utility model discloses a composite grinding machine tool for an internal thread and an external bearing channel of an automobile steering nut, which is characterized in that an automobile steering nut workpiece to be machined is clamped through a workpiece main shaft; the X-axis sliding plate is moved in the X direction to drive the outer channel grinding main shaft to conduct outer bearing channel grinding machining on the workpiece to be machined, and after machining is completed, the X-axis sliding plate is moved in the X direction to drive the inner thread grinding main shaft to conduct inner thread grinding machining on the workpiece to be machined till all machining procedures of the automobile steering nut workpiece are completed. In the machining process of the machine tool, only one-time workpiece clamping is needed, stable positioning of the workpiece in the front-back machining process can be effectively guaranteed, the machining precision and the machining efficiency are effectively improved,