Automatic fixture for processing disc workpieces with center holes

An automatic fixture for processing disc workpieces with center holes belongs to machine fixtures, and is characterized in that a transitional disc is mounted in a taper hole at the front end of a spindle, one end of the transitional disc is provided with a conical handle while the other end is a positioning cone, an expansion sleeve with an inner taper hole is mounted on the positioning cone, a hydraulic power cylinder is mounted at the rear end of the spindle, a draw bar is arranged in a hole of the spindle, one end of the draw bar is connected with the hydraulic power cylinder while the other end is provided with a thrust plate, the thrust plate is fixed via locking nuts, and an end surface of the thrust plate contacts with an end surface of the expansion sleeve. The automatic fixture has the advantages of simple structure, convenient and fast use, easy and feasible adjustment, and capability of meeting processing requirements of parts with different dimensions.