Rapid positioning device and positioning method for semicircular product

The invention discloses a rapid positioning device and method for a semicircular product, the device comprises a clamping plier body, at least one jaw of the clamping plier body is rotatably provided with a positioning balance rod, the positioning balance rod extends in the horizontal direction, and a rotating shaft of the positioning balance rod extends in the horizontal direction; and a space for positioning a semicircular product is formed between the positioning balance rod and the clamping pincer body. The device is high in practicability and short in clamping time, and the machining efficiency is remarkably improved; the universality is high, and products of various sizes can be positioned; the subsequent comprehensive processing on the upper surface is facilitated; the upper surface is horizontal, and an included angle exists between the upper surface and the horizontal direction; when the angle rotating rod presses the product, the third rotating shaft is locked, so that the product is prevented from