Method for machining threaded holes uniformly distributed in conical surface of workpiece, and clamp

The invention discloses a method for machining threaded holes uniformly distributed in a conical surface of a workpiece, and a clamp. A central line of the threaded holes uniformly distributed in the conical surface of the workpiece is switched to be parallel to a spindle of a machine tool, and the aim of clamping the threaded holes uniformly distributed in the circumference at a time and sequentially machining the threaded holes are achieved by utilizing an index plate of the machine tool. The distance between the center of a ball at the top end of a core rod and the upper surface of a bottom plate is calculated through a trigonometric function, and the distance between the center of the ball at the top end of the core rod and the central line of the threaded holes is calculated. Meanwhile, a positioning spigot coaxial with the core rod is arranged on a base plate, so that the workpiece can be quickly positioned and aligned. Finally, the workpiece is clamped in a mode of being tightly pressed by a pressing p